JP2010172641A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent washing water sprayed from a washing nozzle from leaking from a sealing part when a dishwasher is used for a long period of time. <P>SOLUTION: The dishwasher includes: a washing pump 26 including a motor 25 for pressurizing the washing water and sending it to the washing nozzle 21; control means 33 for successively controlling respective steps of washing, rinsing and drying; and state detection means 34 for detecting an operation progression state. When the state detection means detects a prescribed operation progression state, the control means lowers the discharge pressure of the washing water to be sprayed from the washing nozzle from an initial pressure for a prescribed amount. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dishwasher for washing dishes by jetting washing water from a washing nozzle.

  Conventionally, as shown in FIG. 5, this type of dishwasher is housed in a system kitchen, and a washing tub 2 provided inside the housing 1 is provided with an opening 3 in the upper part and houses dishes 4. Tableware basket 5 is arranged. A washing nozzle 6 is rotatably provided below the tableware basket 5, and the washing water stored in the washing tank 2 is pressurized and circulated by the washing pump 7 and sprayed from the washing nozzle 6 to wash the tableware 4. .

  A rail 8 is fixed below the cleaning tank 2 and supported so as to be movable in the front-rear direction. When the tableware 4 is put in and out, the washing tub 2 stored in the housing 1 is pulled forward, and the tableware 4 is accommodated from the opening 3. Next, the cleaning tank 2 is returned to the housing 1 and stored, and the lid body 9 waiting in the upper space in the housing 1 is moved backward by the link mechanism 10 or the like disposed on the side surface of the housing 1. The lid 9 is configured so as to descend and close the opening 3 of the cleaning tank 2, and the lid 9 is for contacting and sealing the cleaning tank 2 with the opening 3 of the cleaning tank 2 closed. A first seal member 11 made of an elastic body is provided.

When the washing tank 2 is returned to the housing 1 and stored and the operation is started, the washing water is heated from the washing nozzle 6 toward the dishes 4 while the washing water is heated by the heating means 12 arranged at the bottom of the washing tank 2. A cleaning process is performed in which water is sprayed to clean the dishes 4. Thereafter, the tableware 4 is rinsed and rinsed, and then the drying process is performed to terminate the operation (see, for example, Patent Document 1).
JP 2005-87271 A

  However, in such a conventional dishwasher configuration, washing water is sprayed from the washing nozzle 6 toward the dishes 4 in the washing process and the rinsing process, but the washing water that does not hit the dishes 4 is washed in the washing tank 2 and the lid. It hits the body 9, the first seal member 11, and the like. The material of the component parts deteriorates over a long period of use and the sealing performance of the first seal member 11 becomes weak. However, when the discharge pressure of the cleaning pump 7 is used in a high state, the deteriorated portion of the first seal member 11 In this case, there is a possibility that the washing water may hit the water and lead to water leakage.

  The cleaning pump 7 also has a box shape by sandwiching the second seal member 13 in order to form a casing. In this case, too, when the discharge pressure of the cleaning pump 7 is high, it is used for a long period of time. The second sealing member 13 made of an elastic body is deteriorated to have a poor sealing property, leading to water leakage.

  The present invention solves the above-described conventional problems, and it is an object of the present invention to prevent the cleaning water sprayed from the cleaning nozzle from leaking from the seal portion when used for a long period of time and to improve the reliability against water leakage. It is said.

In order to solve the above-described conventional problems, the dishwasher of the present invention includes a cleaning nozzle that injects cleaning water onto the dishes accommodated in the cleaning tank, and a sealing member that seals between the cleaning tank and the lid. A cleaning pump having a motor that pressurizes cleaning water and sends the cleaning water to the cleaning nozzle, a control unit that sequentially controls each step of cleaning, rinsing, and drying, and a state detecting unit that detects an operation progress state, The control means is configured to lower the discharge pressure of the cleaning water sprayed from the cleaning nozzle by a predetermined amount from the initial pressure when detecting that the state detecting means has reached a predetermined operation progress state.

  Thus, when the state detection means detects that the predetermined operation progress state has been reached, the momentum of the cleaning water from the cleaning nozzle can be kept lower than the initial state, and even when used for a long time, It becomes possible to ensure the sealing property and improve the reliability against water leakage.

  Even when the dishwasher of the present invention is used for a long period of time, the sealing performance by the sealing member can be secured, and the reliability against water leakage from the sealing portion can be improved.

  1st invention is the washing tank which accommodates tableware, the cover body which covers the opening part of the said washing tank, the washing nozzle which injects washing water to the tableware accommodated in the said washing tank, The said washing tank, A sealing member for sealing between the lid, a water supply means for supplying cleaning water to the cleaning tank, a heating means for heating the cleaning water, and a temperature detection for detecting the temperature of the cleaning water in the cleaning tank A cleaning pump having a motor that pressurizes cleaning water and sends the cleaning water to the cleaning nozzle, a control unit that sequentially controls each step of cleaning, rinsing, and drying, and a state detecting unit that detects an operation progress state. When the control means detects that the state detection means has reached a predetermined operation progress state, the discharge pressure of the cleaning water sprayed from the cleaning nozzle is decreased by a predetermined amount from the initial pressure, Reaching the predetermined operating progress state When detected, the momentum of the washing water from the washing nozzle can be kept lower than the initial state, and even when used for a long period of time, it is possible to ensure the sealing performance by the sealing member and improve the reliability against water leakage Can be made.

  In the second aspect of the invention, in particular, the state detection means of the first aspect of the invention is the predetermined number of operations, the predetermined operation time, the predetermined amount of water supplied by the water supply means, or the temperature inside the cleaning tank by the temperature detection means. By detecting at least one of the number of times of reaching or the time connected to the power source, it is possible to accurately and easily determine that it has been used more than a predetermined state.

  According to a third aspect of the present invention, the control means of the first or second aspect of the present invention accurately decreases the discharge pressure of the cleaning water by reducing the rotational speed of the motor of the cleaning pump by a predetermined amount from the initial rotational speed. Can be made.

  In the fourth aspect of the invention, in particular, the control means according to any one of the first to third aspects of the present invention causes the cleaning power to rapidly decrease by gradually reducing the rotational speed of the motor of the cleaning pump. The reliability with respect to water leakage can be improved.

  In the fifth aspect of the invention, in particular, the control means of the third or fourth aspect of the invention sets at least one time of the washing step or the rinsing step from an initial value in accordance with a decrease in the rotation speed of the washing pump motor. By increasing the predetermined amount, the cleaning power can be maintained in the same state as the initial stage.

  In particular, the sixth invention has a housing that houses the cleaning tank according to any one of the first to fifth inventions, and the cleaning tank is provided so as to be able to be pulled out from the housing. The maintainability during use can be improved.

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

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the dishwasher according to the first embodiment of the present invention, and FIG. 2 is a time chart showing the operation of the dishwasher. 1 and 2, the housing 14 accommodated in the system kitchen is provided with a cleaning tank 17 having an opening 15 on the upper side for accommodating and cleaning the dishes 16. The cleaning tank 17 is connected to a water supply pipe through a water supply means 18 so that a predetermined amount of tap water set in advance in the cleaning tank 17 during operation is supplied.

  The cleaning tank 17 is provided so as to be able to be pulled out in the front-rear direction along a pair of rails 19 that are installed substantially horizontally in the inner sides of both sides of the housing 14. The washing tank 17 is configured to be removable from the housing 14 by releasing the fixation. A table basket 20 for storing the tableware 16 is disposed inside the cleaning tank 17, and a cleaning nozzle 21 is rotatably provided below the table basket 20. Inside the cleaning tank 17, a heating means 22 such as a heater for heating the stored cleaning water and a drain outlet 23 are provided at the bottom of the cleaning tank 17.

  Outside the cleaning tank 17, there are provided a temperature detection means 24 composed of a thermistor or the like that detects the temperature in the cleaning tank 17, and a motor 25 that pressurizes the cleaning water accumulated in the drain port 23 and sends it to the cleaning nozzle 21. A cleaning pump 26 is arranged. The cleaning pump 26 includes a scroll-shaped casing composed of a plurality of parts, and a sealing property is ensured by sandwiching a second seal member 27 made of an elastic body. The washing water accumulated in the drain port 23 is pressurized and circulated by the washing pump 26 and sprayed into the washing tank 17 from the washing nozzle 21 to wash the dishes 16.

  Further, a lid 28 for closing the opening 15 of the cleaning tank 17 is movably disposed above the housing 14 and can be moved up and down by a pair of left and right parallel link mechanisms 29 including a pair of front and rear links. The first seal member 30 made of an elastic body that is supported and seals the opening 15 of the cleaning tank 17 is fixed, and when the cleaning tank 17 is pulled out, the first seal member 30 is positioned before and after the cleaning tank 17. It is configured to be displaced upward so as not to interfere with the movement.

  Moreover, the exhaust port 31 which discharges | emits the air in the washing tank 17 outside, and the ventilation means 32 which supplies external air into the washing tank 17 are provided, and the humid air in the washing tank 17 is exhausted by the exhaust port 31 at the time of a drying process. It is set as the structure discharged | emitted out of the washing tank 17 through.

  The control means 33 is configured to sequentially control each process of cleaning, rinsing and drying, and to control the heating means 22 and the motor 25 of the cleaning pump 26 in each process. It is composed. The state detection means 34 is the cumulative number of operations since the dishwasher was installed and used, or the cumulative operation time, the amount of tap water supplied to the washing tank 17 by the water supply means 18, or the temperature detection means 24 and the washing tank 17 At least one of the number of times the inner temperature reaches a predetermined temperature is detected.

Next, operation | movement of the dishwasher in the said structure is demonstrated. The tableware 16 is set in the tableware basket 20, the washing tank 17 is accommodated in the housing 14, and the operation is started. At this time, the lid 28 provided with the first seal member 30 on the lower peripheral edge is displaced downward, and the first seal member 30 is pressed against the upper peripheral edge of the opening 15 opened above the cleaning tank 17. Then, it is closed and sealed so that the washing water from the washing tank 17 does not leak. While the cleaning water is heated to a predetermined temperature by the heating means 22 arranged at the bottom of the cleaning tank 17, a cleaning process is performed to spray the tableware 16 from the cleaning nozzle 21 to remove dirt on the tableware 16. Thereafter, the tableware 16 is rinsed and rinsed, followed by a drying step and the operation is terminated.

  In general, it is expected that aging will occur in parts and materials when used for a long time after installation. And the situation of this aging changes with the environment and conditions used, and also the structure of an apparatus. In the dishwasher, deterioration of the first seal member 30 that is exposed to water, heat, steam, detergent, and tableware dirt entering the washing tank 17 can be considered.

  As shown in FIGS. 2 (a) and 2 (b), when the state detection unit 34 detects the predetermined number of operations n1, the control unit 33 sets the rotation number of the motor 25 of the cleaning pump 26 to the initial rotation number r1, that is, The discharge speed of the cleaning water sprayed from the cleaning nozzle 21 is decreased from the initial pressure P1 to the predetermined pressure by decreasing the rotation speed Δr by a predetermined amount from the value r1 before reaching the predetermined operation number n1 to the rotation speed r2. By reducing the pressure ΔP by the amount ΔP, the momentum of the washing water impinging on the first seal member 30 fixed to the lid 28 can be weakened, and the reliability against water leakage can be improved. .

  The state detection unit 34 detects that a predetermined operation progress state has been reached. When the predetermined operation progress state is detected by the accumulated operation number, the useful life based on general normal use, for example, the operation number corresponding to the use over the predetermined number of years is set in advance. When driving is performed, it is detected that a predetermined driving progress state has been reached, and the driving progress state can be detected in accordance with the actual usage.

  The state detection means 34 is not only a predetermined number of operations, but also a predetermined operation time, a predetermined amount of water passing through the water supply means 18, or the number of times the temperature in the cleaning tank 17 has reached a predetermined temperature by the temperature detection means 24. At least one or a plurality of these may be detected, and an integrated value due to use after installation is detected. In addition, a dishwasher may be installed and time being connected to a power source (such as an outlet) may be counted regardless of whether or not it is in operation.

  The cleaning pump 26 has a scroll-shaped casing made up of a plurality of parts, and a sealing property is ensured by sandwiching a second sealing member 27 made of an elastic body. The second sealing member Similarly to the first seal member 30, the material 26 may be deteriorated during use for a period longer than a predetermined time, so that the rotational speed of the motor 25 is decreased from the initial rotational speed r 1 to a predetermined amount of rotational speed Δr. By setting the rotation speed to r2, the operation in the state where the internal pressure in the cleaning pump 26 is lower than the initial value is possible, and the sealing performance of the second seal member 27 can be ensured for a long period of time.

  As described above, when the dishwasher of the present invention is used for a long period of time, the washing water sprayed from the washing nozzle can be prevented from leaking from the seal portion, and the reliability against the water leakage can be improved.

  In addition, since the discharge pressure of the cleaning water is reduced from the initial state and the cleaning power is reduced, the user can be aware of the change, and can be inspected for use for a period longer than a predetermined period. In addition, by setting the discharge pressure after the drop to the minimum discharge pressure necessary for the cleaning power, it is possible to realize a predetermined cleaning effect and make the user aware of the change in the discharge pressure. It is possible to prompt inspections during use for a longer period of time while ensuring reliability.

(Embodiment 2)
FIG. 3 is a time chart showing the operation of the dishwasher according to the second embodiment of the present invention. The feature of the present embodiment is that when the state detection unit 34 detects the predetermined number of times n1 by long-term use, the control unit 33 changes the rotation speed of the motor 25 of the cleaning pump 26 from the initial rotation speed r1 to r2. The predetermined number of rotations Δr is gradually decreased, and when the predetermined number of operations n2 is detected, the number of rotations r2 is maintained. About another structure, it is the same as that of 1st Embodiment, attaches | subjects the same code | symbol about the same component, The detailed description uses the thing of 1st Embodiment.

  According to this configuration, it is possible to improve the reliability with respect to the water leakage without rapidly deteriorating the cleaning power and without the user noticing the change in the state. Note that the rotation speed of the motor 25 may be decreased from r1 to r2 through a plurality of stages.

(Embodiment 3)
FIG. 4 is a time chart showing the operation of the dishwasher according to the third embodiment of the present invention. A feature of the present embodiment is that the state detection unit 34 detects the predetermined number of operations n1 by long-term use, and the control unit 33 reduces the rotation speed of the motor 25 of the cleaning pump 26 by a predetermined amount Δr. At least one of the cleaning process and the rinsing process is set longer than the initial time t1 by a predetermined time Δt. About another structure, it is the same as that of 1st Embodiment, attaches | subjects the same code | symbol about the same component, The detailed description uses the thing of 1st Embodiment.

  According to this configuration, even when the discharge pressure of the cleaning water sprayed from the cleaning nozzle 21 decreases by ΔP, the cleaning power can be maintained the same as the initial state.

  The dishwasher of the present invention can be implemented in various types of dishwashers, such as a desktop type and a floor placement method, in addition to the built-in type installed in the system kitchen described in the embodiment. In addition, each of the above embodiments can be implemented independently, and a part of each configuration described in the embodiment can be combined.

  As described above, the dishwasher according to the present invention can ensure the sealing performance by the sealing member even when used for a long time, and can improve the reliability against water leakage from the sealing portion. It is useful as a built-in dishwasher that can be installed on a desktop or system kitchen.

The longitudinal cross-sectional view of the dishwasher of the 1st Embodiment of this invention (A) (b) Time chart showing the operation of the dishwasher (A) (b) Time chart which shows operation | movement of the dishwasher of the 2nd Embodiment of this invention. (A) (b) Time chart which shows operation | movement of the dishwasher of the 3rd Embodiment of this invention. Vertical section of a conventional dishwasher

DESCRIPTION OF SYMBOLS 14 Case 17 Washing tank 18 Water supply means 21 Washing nozzle 22 Heating means 24 Temperature detection means 26 Washing pump 28 Lid 30 First seal member 33 Control means 34 State detection means

Claims (6)

A cleaning tank for storing tableware, a lid for covering the opening of the cleaning tank, a cleaning nozzle for injecting cleaning water to the tableware stored in the cleaning tank, and between the cleaning tank and the lid A sealing member for sealing water, a water supply means for supplying cleaning water to the cleaning tank, a heating means for heating the cleaning water, a temperature detecting means for detecting the temperature of the cleaning water in the cleaning tank, and the cleaning water A cleaning pump including a motor that pressurizes and sends the cleaning nozzle, a control unit that sequentially controls each of the cleaning, rinsing, and drying steps, and a state detection unit that detects an operation progress state. A dishwasher configured to reduce a discharge pressure of cleaning water sprayed from the cleaning nozzle by a predetermined amount from an initial pressure when the state detecting unit detects that a predetermined operation progress state has been reached. The state detection means is a predetermined number of operations, a predetermined operation time, a predetermined amount of water supplied by the water supply means, a number of times that the temperature in the cleaning tank has reached a predetermined temperature by the temperature detection means, or a time connected to a power source. The dishwasher according to claim 1, wherein at least one of the two is detected. The dishwasher according to claim 1 or 2, wherein the control means reduces the rotation speed of the motor of the washing pump by a predetermined amount from the initial rotation speed. The dishwasher according to any one of claims 1 to 3, wherein the control means gradually decreases the rotation speed of the motor of the washing pump. 5. The dishwasher according to claim 3 or 4, wherein the control means is configured so that at least one time of the washing process or the rinsing process is increased by a predetermined amount from an initial value in accordance with a decrease in the rotation speed of the motor of the washing pump. . The dishwasher according to any one of claims 1 to 5, further comprising a housing that houses a washing tub, wherein the washing tub is provided so as to be drawable from the housing.

Images