JP4749261B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher for storing and washing tableware in a substantially rectangular washing region.

  Conventionally, in this type of dishwasher, the washing water in which the detergent is dissolved is pumped and supplied to the washing nozzle by a washing pump, and the washing process is performed by spraying the washing water toward the tableware. The rinsing process is carried out by rinsing the washing water by supplying the rinsing water to the rinsing nozzle with a rinsing pump and spraying the rinsing water toward the dishes. The rinsing water sprayed in this rinsing process is collected in a washing tank and reused as washing water. In this case, as the rinse water, warm water heated to a predetermined temperature by an electric heater in a booster tank is used (see, for example, Patent Document 1).

  FIG. 11 shows a plan view of a washing chamber 100 portion of a conventional dishwasher. In this figure, reference numeral 101 denotes a bottom plate of the cleaning chamber 100, which has a substantially rectangular shape (in this example, a substantially square shape). The cleaning chamber 100 is configured on the bottom plate 101, and the plane cross section is also substantially rectangular (similarly substantially square). The tableware is stored in the cleaning chamber 100 in a state of being stored in a rack (not shown) having a substantially rectangular shape (similarly a substantially square shape) that is stored in the cleaning chamber 100 with almost no gap. That is, the inside of the substantially rectangular (substantially square) rack is a tableware cleaning area (area for storing tableware). In the case of a dishwasher that does not use a rack, the inside of the substantially rectangular cleaning chamber 100 is the cleaning area.

  Reference numeral 102 denotes a cleaning nozzle, and reference numeral 103 denotes a rinsing nozzle. The cleaning nozzle 102 is rotatably attached to a nozzle support shaft 104 positioned substantially at the center above and below the rack in the cleaning chamber 100. The rinsing nozzle 103 communicates with a rinsing water flow path 105 in the nozzle support shaft 104, and the cleaning nozzle 102 communicates with a cleaning pipe (not shown) provided around the nozzle support shaft 104.

Then, the cleaning water in the cleaning tank is pumped and supplied to the cleaning nozzle 102 through the cleaning pipe by a cleaning pump (not shown), and sprayed from the cleaning water injection port 106 provided in the cleaning nozzle 102 toward the dishes (cleaning process). ). After completion of this cleaning process, the rinsing water in the booster tank (not shown) is supplied by pressure to the rinsing nozzle 103 via the rinsing water flow path 105 (FIGS. 12 to 14) by the rinsing pump (not shown) and provided in the rinsing nozzle 103. It is injected toward the tableware from the rinsing water injection port 107 (rinsing step). The cleaning nozzle 102 and the rinsing nozzle 103 are rotated by the reaction of the injection. The sprayed rinse water was collected in the washing tank and used as washing water in the next washing step.
JP 2004-135830 A

  Here, FIG. 12 to FIG. 14 show cross-sectional views of the nozzle support shaft 104 portion on the lower side of the conventional dishwasher. Four communication holes 108 are formed in the upper part of the nozzle support shaft 104 in this case, and the nozzle holder 109 can rotate on the nozzle support shaft 104 so as to cover the communication hole 108 (water-sealed state). It is attached. Two rinse nozzles 103 are attached to the nozzle holder 109 at positions facing each other. The tip of the nozzle support shaft 104 is sealed.

  In this case, a communication groove 111 is formed on the inner surface of the nozzle holder 109 at a position corresponding to the communication hole 108... Of the nozzle support shaft 104, and the communication groove 111 includes all the communication holes 108.・ ・ Communicate with The rinsing nozzles 103 and 103 are attached to the nozzle holder 109 so that the inside thereof communicates with the communication groove 111 at a height corresponding to the communication holes 108.

  When the rinsing nozzle 103 is aligned with the communication hole 108 of the nozzle support shaft 104 as shown in FIG. 13, the rinsing water pumped to the rinsing water flow path 105 by the rinsing pump exits the communication hole 108 and rinses straightly. It flows into the nozzle 103. And it will be ejected from the rinse water ejection port 107. Further, in the position where the rinsing nozzle 103 does not match the communication hole 108 of the nozzle support shaft 104 as shown in FIG. 14, the rinsing water pumped to the rinsing water flow path 105 by the rinse pump is communicated with the communication hole 108. , And then bent along the communication groove 111 and flows into the rinsing nozzle 103 through the communication groove 111. However, since a sufficient flow area is ensured in the conventional communication groove 111, the flow path Resistance did not occur, and the pressure of the rinsing water flowing into the rinsing nozzle 103 was substantially equal to the state shown in FIG.

  On the other hand, as described above, the cleaning area configured in the cleaning chamber 100 is substantially rectangular (in this example, substantially square), and therefore the pressure of the rinsing water ejected from the rinsing water ejection port 107 is supported by the nozzle. When the distance from the shaft 104 is a value that only reaches the opposite side (sides facing each other) of the cleaning region that is closest, the four corners (corner) that are located on the diagonal line and are farthest from the nozzle support shaft 104 Part) Rinse water will not reach. Therefore, the pressure of the rinsing water is conventionally set to a value that is jetted from the rinsing water jet 107 and reaches the four corners of the cleaning region.

  Therefore, conventionally, the rinse water injection region by the rotating rinse nozzle 103 is a circular region indicated by a two-dot chain line (L) in FIG. Therefore, in the opposite side portions (circular arc portions protruding from the bottom plate 101 in FIG. 15) other than the four corners of the cleaning region, there is much rinsing water that becomes excessive water pressure and actually hits the side wall of the cleaning chamber 100 without being sprayed on the dishes. As a result, useless rinsing water was consumed. Since the rinse water is heated by the heater as described above, waste of power consumption and waste of power consumption are generated, and improvement has been desired.

  The present invention has been made in order to solve the conventional technical problem, and in a dishwasher for washing dishes in a substantially rectangular washing area, the present invention aims to save rinsing water with an extremely simple configuration. The purpose is to reduce energy consumption.

  The dishwasher of the present invention is for storing and cleaning tableware in a substantially rectangular cleaning area, and is provided with a nozzle support shaft provided at the approximate center above and / or below the cleaning area. And a rinse water flow path configured in the nozzle support shaft, a rinse pump for pumping and supplying rinse water to the rinse water flow path, and four locations formed on the nozzle support shaft respectively directed to the four corners of the cleaning region. Communication holes, a nozzle holder that covers each communication hole and is rotatably attached to the nozzle support shaft, and a communication groove that is formed on the entire inner surface of the nozzle holder corresponding to each communication hole and communicates with all the communication holes. And a rinsing nozzle that is attached to the nozzle holder and communicates with the inside through the communication groove and injects rinsing water into the cleaning region. The rinsing nozzle rotates with the nozzle holder and is connected to each communication hole. And, causes reach the rinse water to the four corners of the washing zone in that state, the communication groove, characterized in that a predetermined flow resistance.

  According to the present invention, in a dishwasher for storing and washing tableware in a substantially rectangular washing region, a nozzle support shaft provided at a substantially central position above and / or below the washing region, A rinsing water flow path configured in the nozzle support shaft, a rinsing pump for supplying rinsing water to the rinsing water flow path, and communication formed at four positions on the nozzle support shaft respectively directed to the four corners of the cleaning region A hole, a nozzle holder that covers each communication hole and is rotatably attached to the nozzle support shaft, a communication groove that is formed around the inner surface of the nozzle holder corresponding to each communication hole, and communicates with all the communication holes; A rinsing nozzle that is attached to the nozzle holder and communicates with the inside through the communication groove and injects rinsing water into the cleaning region, and the rinsing nozzle rotates with the nozzle holder to face each communication hole. In this state, the rinsing water can reach the four corners of the cleaning area, and a predetermined flow resistance is provided in the communication groove. Therefore, the rinsing water sprayed from the rinsing nozzle in a state where the rinsing nozzle corresponds to the communication hole. Can reach the four corners of the cleaning area. Thereby, rinse water can be sprayed without trouble also on the tableware stored in the part (four corner parts) far from the nozzle support shaft.

  On the other hand, in a state where the rinsing nozzle does not correspond to the communication hole, the rinsing water is bent along the communication groove after exiting the communication hole, and rinse water that has passed through the communication groove flows into the rinse nozzle and is injected. However, in the present invention, since the flow path resistance is provided in the communication groove, the pressure injected from the rinse nozzle is reduced as compared with the case where the pressure is injected into the four corners. By setting the dimensions of the communication groove so that the rinsing water that has passed through the communication groove reaches the part other than the four corners of the cleaning area, the rinsing water is not affected at the four corners and other parts of the cleaning area. However, it is possible to limit the injection of useless rinse water by the flow path resistance of the communication groove at portions other than the four corners. Accordingly, it is possible to reduce consumption of rinse water and reduce energy consumption while maintaining the cleaning ability of tableware in the cleaning region. In particular, there is an advantage that it can be realized with a simple configuration in which a flow path resistance is provided in the communication groove.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the dishwasher 1 to which the present invention is applied, as seen through the washing room 2 and the machine room 3, FIG. 2 is a plan view of the washing room 2 of the dishwasher 1 in FIG. 1, and FIG. FIG. 4 and FIG. 5 are plan sectional views of the nozzle support shaft 4, FIG. 6 is a block diagram of an electric circuit of the dishwasher 1, and FIG. These are timing charts explaining the operation of the dishwasher 1.

  The main body 6 of the dishwasher 1 of the embodiment is made of a steel plate such as stainless steel, and the upper portion of the main body 6 is washed above the bottom plate 10 having a substantially rectangular shape (substantially square shape in the embodiment) having a plurality of through holes. A chamber 2 is formed, and a machine chamber 3 is formed below the chamber 2. The cleaning chamber 2 is a space having a substantially rectangular shape in plan view and a substantially square shape in the embodiment, and is closed by a box-like door 7 that can move up and down so as to be freely opened and closed. Further, the front surface of the machine room 3 is also covered with a panel (not shown).

  The cleaning chamber 2 is provided with a rack rail 9 that takes out the rack 8 and supports it so that it can be stored. The rack 8 also has a substantially rectangular shape (substantially square shape in the embodiment) in plan view in accordance with the shape of the cleaning chamber 2, and the widths of the opposite sides in the vertical and horizontal directions are substantially equal, and the bottom surface is easily cleaned with water. It is mesh-like so that excess water can pass through. The rack 8 is used for storing tableware, and has a substantially square shape that is large enough to be stored in the cleaning chamber 2 above the bottom plate 10 without any gaps. In other words, the inside of the substantially square (substantially rectangular) rack 8 (which substantially matches the shape of the bottom plate 10 in the plan view) is the dish washing area (the area where dishes can be stored).

  Further, a cleaning nozzle 13 and a rinsing nozzle 14 are provided in the cleaning chamber 2 so as to be rotatable approximately coaxially. Note that the cleaning nozzle 13 and the rinsing nozzle 14 may be provided at the upper and lower portions in the cleaning chamber 2 as in the embodiment, or depending on the model, only the lower portion or only the upper portion.

  On the other hand, the machine room 3 is provided with a washing tank 18, a washing pump 19, and a rinsing pump 21. A booster tank (rinse tank) 22 is disposed adjacent to the machine room 3. When the cleaning pump 19 is operated, the cleaning water in the cleaning tank 18 is sucked and is pumped and supplied to the cleaning nozzle 13 through the cleaning pipe 26 provided outside the nozzle support shaft 4. The cleaning nozzle 13 includes a rotatable arm 31 and a plurality of cleaning water injection ports 32. The cleaning nozzle 13 rotates while spraying the cleaning water supplied from the cleaning pump 19 toward the rack 8 from the cleaning water injection port 32. To do.

  When the rinsing pump 21 is operated, rinsing water, which is clean warm water in the booster tank 22, is sucked and supplied to the nozzle support shafts 4, 4 via the rinsing pipe 36. The nozzle support shafts 4 and 4 are provided at the upper and lower approximate centers of the rack 8 (cleaning region), respectively, extend in the vertical direction, and include a rinse water flow path 4A connected to the rinse pipe 36 therein. Is formed. The rinsing nozzle 14 includes a hollow arm 41 extending substantially horizontally and a plurality of rinsing water injection ports 42 formed in the arm 41. The arm 41 of the rinsing nozzle 14 is provided with a nozzle holder. The nozzle support shaft 4 is rotatably supported via 45.

  Four communication holes 38 are formed in the upper part of the nozzle support shaft 4 (lower part in the case of the nozzle support shaft 4 in the upper part of the cleaning chamber 2), and the communication holes 38 are covered (water-sealed state). As described above, the nozzle holder 45 is rotatably attached to the nozzle support shaft 4. The four communication holes 38 are directed toward the four corners of the rack 8 (cleaning region). Two arms 41 of the rinsing nozzle 14 are attached to the nozzle holder 45 at positions facing each other. The tip of the nozzle support shaft 4 is sealed.

  A communication groove 46 is formed on the inner surface of the nozzle holder 45 at a position corresponding to the communication hole 38 of the nozzle support shaft 4 over the entire circumference, and this communication groove 46 is formed in all the communication holes 38. Communicate. The arms 41 of the rinsing nozzles 14, 14 are attached to the nozzle holder 45 so that the inside communicates with the communication groove 46 at a height corresponding to the communication holes 38.

  When the rinse water is pressure-fed and supplied to the rinse water flow path 4A of the nozzle support shaft 4, the rinse water enters the internal space of the arm 41 of the rinse nozzle 14 via the communication holes 38 ... and the communication groove 46. It passes through there and is jetted from the rinse water jet port 42 toward the rack 8. Moreover, the rinse nozzle 14 rotates by reaction of this injection.

  In this case, when the arm 41 of the rinsing nozzle 14 is in a position that coincides with the communication hole 38 of the nozzle support shaft 4 as shown in FIG. 4 (FIG. 2) (positions directed to the four corners of the rack 8; FIG. 2). The rinsing water pressure-fed and supplied to the rinsing water flow path 4A by the rinsing pump 21 exits the communication hole 38 and flows straight into the arm 41 of the rinsing nozzle 14. Then, the water is ejected from the rinse water ejection port 42. Further, as shown in FIG. 5, the arm 41 of the rinsing nozzle 14 is not aligned with the communication hole 38 of the nozzle support shaft 4 (FIG. 5 shows that the rinsing nozzle 14 is orthogonal to the opposite side of the cleaning chamber 2, that is, the rack 8). In the direction (the position where the distance between the nozzle support shaft 4 and one side of the rack 8 is closest) (FIG. 8), the rinsing water pumped by the rinsing pump 21 to the rinsing water flow path 4A is the communication hole 38. .., Enters the communication groove 46, bends along the communication groove 46, and then flows into the arm 41 of the rinse nozzle 14 through the communication groove 46.

  In this case, in the present invention, by setting the depth dimension of the communication groove 46 to be shallower than the conventional one, the communication groove 46 is configured to give a predetermined flow path resistance to the rinsing water supplied by pressure feeding. The pressure of the rinsing water pumped by the rinsing pump 21 to the rinsing water flow path 4A is equivalent to the conventional one. Therefore, in the state where the rinsing nozzle 14 matches the communication hole 38, the rinsing water ejected from the rinsing water ejection port 42 reaches the four corners of the rack 8 sufficiently. On the other hand, in the state where the rinsing nozzle 14 does not match the communication hole 38, the rinsing water flowing into the arm 41 of the rinsing nozzle 14 is reduced in water pressure due to its flow resistance when passing through the communication groove 46. The momentum of the rinsing water ejected from the rinsing water ejection port 42 becomes weaker than when it comes straight from the communication hole 38.

  9 and 10 show the state of the rinse water ejected from the rinse water ejection port 42. When the pressure of the rinsing water flowing into the arm 41 with the rinsing nozzle 14 matching the communication hole 38 is high (FIG. 2), the angle of the rinsing water ejected from the rinsing water ejection port 42 becomes large (the injection amount is also large). That is, the water reaches far from the nozzle support shaft 4 and the water reaches. On the other hand, when the pressure is lowered due to the flow path resistance of the communication groove 46, the injection angle becomes small (the amount of injection becomes small), and the range where the rinse water reaches becomes narrow. This state is shown by a two-dot chain line L (rinse water injection region) in FIG. The rinse water injection area in FIG. 8 covers the four corners of the cleaning area (inside the rack 8 that substantially matches the bottom plate 10) and has a shape that allows the rinse water to reach the central part of one side closest to the nozzle support shaft 4. It has become.

  This ensures that the rinsing water reaches the four corners of the rack 8 (cleaning area), while the water other than the four corners (position where the side of the rack 8 is close to the nozzle support shaft 4) weakens the water flow of the rinsing water, That is, it is possible to suppress water that directly hits the wall surface of the cleaning chamber 2 (such as the inner wall of the door 7) and spray it only on the tableware. That is, the size and shape of the communication groove 46 are set so as to be the rinse water injection region of FIG.

  With such a configuration, while rinsing water can reach the four corners and other portions of the rack 8 (cleaning region) without any trouble, the injection of wasted rinsing water is restricted by the flow path resistance of the communication groove 46 in the portions other than the four corners. And while maintaining the washing | cleaning capability of the tableware in the washing | cleaning area | region in the rack 8, it becomes possible to reduce the consumption of rinse water and to reduce the consumption energy in the electric heater of the booster tank 22 mentioned later. In particular, since it can be realized with a simple configuration of providing a flow path resistance in the communication groove 46, there is an advantage that an increase in cost due to a design change can be suppressed to zero or to a minimum.

  Next, FIG. 6 shows a block diagram of an electric circuit of the control device (control means) 51 of the dishwasher 1. The control device 51 is composed of a microcomputer 52, and the microcomputer 52 detects the opening / closing of a cleaning water level sensor 53, a power switch 54, and a door 7 provided in the upper part of the cleaning tank 18 (full water level position). Are connected to outputs of a temperature sensor 57 (indicated by one) for detecting the water temperature in the washing tank 18 and the booster tank 22, and in addition to the washing pump 19 and the rinsing pump 21, An electric heater (indicated by one) 58 for heating the cleaning water in the tank 18 and the rinsing water in the booster tank 22, a detergent power supply (terminal plate) 61 for supplying power to a detergent supply device 62 described later, An end buzzer 60 is connected.

  Returning to FIG. 1, reference numeral 62 denotes a detergent supply device (detergent supply means) for supplying detergent to the dishwasher 1, to which a detergent container 63 is connected. The detergent supply device 62 includes a detergent supply pipe 64 and a detergent electrode 66 (detergent concentration detecting means). The detergent supply pipe 64 is a detergent inlet 67 formed on a wall surface located at the bottom of the washing chamber 2 of the dishwasher 1. It is connected to the. Further, the detergent electrode 66 is attached to an electrode attaching portion 68 provided in a portion located below the cleaning water level sensor 53 in the cleaning tank 18. A control device (not shown) of the detergent supply device 62 is connected to the detergent power supply 61 of the dishwasher 1 and is supplied with power.

  Next, the operation of the dishwasher 1 with the above configuration will be described with reference to FIG. First, when the power switch 54 is turned on (A in FIG. 7), the microcomputer 52 heats the rinse water in the booster tank 22 by the electric heater 58. When hot water having a predetermined temperature is generated based on the temperature sensor 57, a hot water supply process of operating the rinse pump 21 to supply hot water to the cleaning tank 18 is executed.

  In this hot water supply process, the rinse pump 21 is operated a plurality of times for a predetermined time. When the rinsing pump 21 is operated, the rinsing water (clean warm water) in the booster tank 22 is sucked and injected into the cleaning chamber 2 from the rinsing nozzle 14 as described above. The injected rinse water flows into the cleaning tank 18 through the bottom plate 10. As a result, warm water is gradually accumulated in the cleaning tank 18, and the water level gradually rises.

  When the water level in the cleaning tank 18 reaches the full water level beyond the position of the detergent electrode 66 and rises to the height of the cleaning water level sensor 53, the output of the cleaning water level sensor 53 is turned on. To stop the hot water supply process.

  When the hot water supply process is completed, the microcomputer 52 next executes a detergent charging process. In this detergent charging process, the microcomputer 52 operates the cleaning pump 19 and also turns on the detergent power supply 61 to supply power to the detergent supply device 62. When power is supplied to the detergent supply device 62, the detergent is sucked from the detergent container 63, supplied to the detergent supply pipe 64, and flows into the cleaning tank 18. On the other hand, when the cleaning pump 19 is operated, warm water in the cleaning tank 18 (hereinafter referred to as cleaning water) is sucked and injected into the cleaning chamber 2 from the cleaning nozzle 13 as described above. The sprayed cleaning water is collected in the cleaning tank 18 through the bottom plate 10 and circulated. By such circulation, the detergent supplied from the detergent supply pipe 64 into the cleaning tank 18 is uniformly mixed with the cleaning water.

  After executing this detergent charging process for a predetermined time, the microcomputer 52 stops the cleaning pump 19 and turns off the detergent electrode 66 to stop the detergent supply device 62 and sounds the buzzer 60 to notify that preparation has been completed. (B in FIG. 7). The dishwasher 1 is now ready. When the detergent concentration reaches a predetermined concentration during the detergent charging process, the detergent supply device 62 stops the detergent supply.

  When cleaning tableware, first, the door 7 is opened, the rack 8 storing the tableware to be cleaned is supported by the rack rail 9 and stored in the cleaning chamber 2, and the door 7 is closed. When the microcomputer 52 detects opening / closing of the door 7 by the door switch 56, the microcomputer 52 executes a cleaning process (C in FIG. 7). In this cleaning process, the microcomputer 52 operates the cleaning pump 19 to suck and pressurize the cleaning water in the cleaning tank 18 containing the detergent, and sprays it from the cleaning nozzle 13 as described above to clean the dishes. The water from which the dishes are washed is dropped and collected again in the washing tank 18 and circulated.

  At the same time, the microcomputer 52 turns on the detergent power supply 61 to supply power to the detergent supply device 62. When the power is supplied to the detergent supply device 62, the detergent is sucked from the detergent container 63 and supplied to the detergent supply pipe 64 and flows into the cleaning tank 18 as described above. The detergent supply device 62 monitors the concentration of the detergent in the washing tank 18 by the detergent electrode 66. When the detergent supply device 62 rises to a predetermined concentration, the detergent supply through the detergent supply pipe 64 is stopped. As a result, the inside of the cleaning tank 18 is maintained at a predetermined detergent concentration. When the cleaning process for a predetermined time is completed, the microcomputer 52 stops the cleaning pump 19 and also turns off the detergent power supply 61.

  Next, the microcomputer 52 proceeds to a rinsing process. In this rinsing process, the microcomputer 52 operates the rinsing pump 21. When the rinsing pump 21 is operated, the rinsing water in the booster tank 22 is sucked and pressurized, and supplied to the upper and lower nozzle support shafts 4 and 4 via the rinsing pipe 36.

  Rinsing water supplied to the lower nozzle support shaft 47 is sprayed upward from the lower rinsing nozzle 14 through the communication holes 38..., That is, toward the rack 8 to rinse the dishes in the rack 8. Remove detergent. Further, the operation of the rinsing water supplied to the upper nozzle support shaft 4 is the same as the operation of the rinsing water supplied to the lower nozzle support shaft 4 except that the upper and lower sides are reversed, and the description thereof is omitted. . The rinsing water that rinses the dishes falls and is collected in the washing tank 18, and the water level in the washing tank 18 gradually rises. When the water level of the washing tank 18 rises above a predetermined level, the water is drained outside the dishwasher 1 through an overflow pipe (not shown) of the washing tank 18. When the rinsing process is executed for a predetermined time, the microcomputer 52 stops the rinsing pump 21 to end the rinsing process, and sounds the buzzer 60 to notify the end (D in FIG. 7).

  Here, conventionally, the supply of the detergent by the detergent supply device 62 has been started at the start of the first cleaning process. The reason is that, for example, if the control is performed so that the detergent is supplied to the washing tank 18 from the start of the hot water supply process, the detergent starts to be supplied in a state where hot water has not yet accumulated around the detergent electrode 66, and the concentration of the detergent is zero. This is because the detergent supply device 62 misdetermines that it is, and the detergent is continuously supplied until the water level rises to the detergent electrode 66, so that the concentration of the detergent in the washing tank 18 becomes too high.

  However, simply supplying the detergent from the start of the first washing step results in insufficient detergent concentration in the washing step, and the tableware cannot be sufficiently cleaned. Therefore, in the present invention, as described above, the detergent charging process is executed after the hot water supply process is completed. As a result, a certain amount of detergent concentration from the start of the first cleaning process or cleaning water in which a necessary detergent concentration is secured is stored in the cleaning tank 18, and the cleaning capability in the first cleaning process is increased. Can be improved. On the other hand, since hot water at the full water level is stored in the cleaning tank 18 at the start of the detergent charging process, the detergent supply device 62 can accurately determine the detergent concentration in the cleaning tank 18 by the detergent electrode 66. Therefore, there is no inconvenience that the detergent is introduced more than necessary.

  In addition, although the Example demonstrated the dishwasher 1 from which a washing | cleaning area | region becomes substantially square shape, this invention is effective even if it is a rectangular shape if it is a certain range. Even in such a case, if the communication groove 46 is configured so that the rinsing water can reach to each corner and the rinsing water reaches far from the nozzle support shaft 4, the water saving effect and the energy saving effect can be improved. Can be expected. In the embodiment, the detergent supply device 62 is provided separately from the dishwasher 1. However, the present invention is not limited to this, and the detergent supply device 62 is mounted on the dishwasher 1 and the detergent is sucked and supplied from the detergent container 63 by the microcomputer 52. Control may be performed. Even in that case, the improvement of the cleaning effect in the first cleaning step can be similarly achieved.

It is the front view which saw through the washing room and machine room of the dishwasher to which this invention is applied. It is a top view of the washing room of the tableware washing machine of FIG. It is an expansion perspective view of the nozzle support shaft part of the washing chamber lower part of the tableware washing machine of FIG. It is a plane sectional view of the nozzle support shaft of the dishwasher of FIG. It is another plane sectional view of the nozzle support shaft of the dishwasher of FIG. It is a block diagram of the electric circuit of the dishwasher of FIG. It is a timing chart explaining operation | movement of the dishwasher of FIG. It is a top view of the washing | cleaning chamber which shows the rinse water injection area | region of the tableware washing machine of FIG. It is sectional drawing of the rinse nozzle for demonstrating the mode of injection of the rinse water from the rinse nozzle of the dishwasher of FIG. It is another sectional drawing of the rinse nozzle for demonstrating the mode of injection of the rinse water from the rinse nozzle of the dishwasher of FIG. It is a top view of the washing room of the conventional dishwasher. It is an expansion perspective view of the nozzle support shaft part of the washing chamber lower part of the tableware washing machine of FIG. It is a plane sectional view of the nozzle support shaft of the dishwasher of FIG. It is another plane sectional view of the nozzle support shaft of the dishwasher of FIG. It is a top view of the washing | cleaning room which shows the rinse water injection area | region of the tableware washing machine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tableware washing machine 2 Washing room 3 Machine room 4 Nozzle support shaft 4A Rinsing water flow path 8 Rack 13 Washing nozzle 14 Rinse nozzle 38 Communication hole 45 Nozzle holder 46 Communication groove 51 Control apparatus 52 Microcomputer 61 Power supply for detergent

Claims (1)

In a dishwasher for storing and washing dishes in a substantially rectangular washing area,
A nozzle support shaft provided at a substantially central position above and / or below the cleaning region;
A rinse water flow path configured in the nozzle support shaft;
A rinse pump for pumping and supplying rinse water to the rinse water flow path;
Four communication holes formed in the nozzle support shaft so as to be directed to the four corners of the cleaning region,
A nozzle holder that covers each communication hole and is rotatably attached to the nozzle support shaft;
A communication groove formed on the entire inner circumference of the nozzle holder corresponding to each communication hole, and communicating with all the communication holes;
A rinsing nozzle attached to the nozzle holder and having an interior communicating with the communication groove and for injecting rinsing water into the cleaning region;
The rinse nozzle rotates together with the nozzle holder to correspond to the communication holes, and in that state, rinse water can reach the four corners of the cleaning area, and a predetermined flow resistance is provided in the communication groove. A dishwasher featuring.

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