JP2006320441A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that water jets out from nozzles, especially lower nozzles through nozzle channels in some cases because a drainage pump operates and supplies washing water to the nozzle channels if the nozzle channels are opened during drainage when an electric motor rotates a washing pump in the direction opposite to the direction when the motor drives the drainage pump during drainage, namely, when the motor drives the drainage pump. <P>SOLUTION: The dishwasher is provided with a switching device which switches between water channels leading to an upper nozzle body and a lower nozzle body. The switching device fully closes the water channels during drainage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dishwasher.

  Conventionally, a dishwasher using this type of pump is described in Patent Document 1 (Japanese Patent Laid-Open No. 9-313425), and a dishwasher using a switching valve is disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2002-219088). )It is described in.

Japanese Patent Laid-Open No. 9-313425

JP 2002-219088 A

  In the conventional dishwasher, the washing pump and the drainage pump are rotated in the forward and reverse directions by the same motor, and the rotation direction of the washing pump and the drainage pump is rotated in the forward and reverse directions in the dishwasher that uses the switching valve to switch each nozzle flow path. Each pump functions accordingly.

  When such a mechanism is provided, the washing pump can take a large flow rate during the normal rotation of the electric motor for the purpose, but the pump used in such a device generally uses a spiral pump. Therefore, a slight pumping action occurs during reverse rotation.

  When draining, when the motor is rotated in the opposite direction to driving the washing pump, that is, when the drainage pump is driven, if the nozzle channel is opened during draining, the washing pump operates to clean each nozzle channel. In order to supply water, water may be ejected from the nozzles, particularly the lower nozzle side, through the nozzle flow paths.

  Therefore, if the drainage pump is stopped, it is necessary to repeat the drainage operation again with the return water, so that the drainage pump efficiency is remarkably lowered and drainage time is required.

  In addition, since there is still water returning from the circulation channel even if the amount of discharged water is reduced, it is necessary to continue draining, which causes entrapment of air during drainage, significantly reducing drainage efficiency and increasing time. In addition, there is a problem that noise due to air entrapment increases.

  In addition, when the supply of cleaning water to each nozzle body is switched so that the cleaning water is ejected in order from each nozzle body, the rinse water that is ejected from the nozzle by the operation of the cleaning pump during the last drainage process In some cases, the drying process may be started with water attached, and there is a possibility that waterdrop marks may remain on the tableware after drying.

  An object of the present invention is to provide a dishwasher that solves the above problems and performs washing or rinsing while switching nozzles to improve the drainage process.

  In order to achieve the above object, a dishwasher according to the present invention includes a first and second lower nozzle bodies provided at a lower portion in a washing tank and having a plurality of jet nozzles for jetting water upward, and the washing tank. Water is supplied to an upper nozzle body that is provided at the upper portion of the inside and has a plurality of jet nozzles for jetting water downward, and water passages that respectively communicate with the first and second lower nozzle bodies and the upper nozzle body. A cleaning pump, a drainage pump for discharging water in the cleaning tank to the outside, an electric motor for driving the cleaning pump and the drainage pump, the first lower nozzle body, and the second lower nozzle body And at the time of water supply from the cleaning pump, the upper nozzle body, the first lower nozzle body, and the second lower side are provided between the water passage leading to the upper nozzle body and the cleaning pump. Switch the water channel leading to the nozzle body, At the time water and a switching device fully closed the waterway.

  ADVANTAGE OF THE INVENTION According to this invention, it can wash and rinse while switching a nozzle, and can provide the dishwasher which improved the drainage process.

  An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a dishwasher according to an embodiment of the present invention.

  A washing tank 2 is provided inside the outer frame body 1 of the dishwasher. The first and second lower nozzle bodies are provided on the lower side of the cleaning tank 2, one on each side. As these lower nozzle bodies, a lower right nozzle body 4a and a lower left nozzle body 4b having a plurality of jet nozzles for jetting water upward are shown in FIG. Each of the lower right nozzle body 4a and the lower left nozzle body 4b is a rotating nozzle body, which imparts necessary directionality to the ejection ports provided in each of them, and rotates by a reaction in which water is ejected.

  The drainage pump 8 drains the washing water after washing in the washing process and the rinse water after rinsing in the rinsing process to the outside of the dishwasher.

  The drainage pump 8 and the cleaning pump 7 are on the same axis and are driven by a common electric motor 9. The electric motor 9 can rotate in both forward and reverse directions. The washing pump 7 is caused to function with one rotation, and the drainage pump 8 is caused to function with the other rotation.

  When the motor to be used is a condenser motor, the ratio of the main winding to the auxiliary winding is set to 1 or more because the output of the motor is larger at the time of cleaning when compared with that at the time of cleaning. This increases the output of the electric motor during cleaning.

  Pressurized washing water is supplied to each nozzle body by a washing switching device 21 through a circulation water channel communicating with each nozzle body.

  The heater 20 is used for heating dry air and heating cleaning water.

  FIG. 3 shows a longitudinal and cross-sectional view of the dishwasher according to the embodiment shown in FIG. 2. In the washing tub 2, there is provided a tableware basket 3 for storing and removing tableware. Tableware basket 3 has an upper basket and a lower basket, and the illustrated lower basket is provided with a tabletop so that a plurality of large plates can be set up on the right side, and a tabletop with a plurality of small plates set up on the left side. It has been. In addition, a tabletop on which a cup and a teacup can be placed is provided between the small plate and the large plate, and at the top of the small plate.

  The illustrated upper basket is provided with a tabletop in which a plurality of bowls are set up on the left side and a plurality of bowls are set up on the right side. In addition to the combination of soup bowl and tea bowl, these tabletops can mount small bowls and small dishes.

  An upper nozzle body 5 having a plurality of ejection holes for ejecting water downward is provided on the upper side in the cleaning tank 2. A plurality of upper nozzle bodies 5 are provided, and three nozzle bodies are shown in FIG. The number of the upper nozzle bodies 5 may be two or more than three as long as cleaning water can be jetted over the tableware in the cleaning tank 2 from above.

  The upper nozzle body 5, the lower right nozzle body 4a, and the lower left nozzle body 4b are rotatably provided, and wash water is sprayed while rotating to clean dishes.

  A cleaning water tank 6 is provided below the cleaning tank 2. A heater 20 is provided in the cleaning water tank 6.

  The washing water in the washing water tank 6 is taken in by the operation of the washing pump 7, pressurized, and sprayed from the upper nozzle body 5, the lower right nozzle body 4a, and the lower left nozzle body 4b.

  A blower fan 10 provided below the washing water tank 6 sends dry air to the dishware basket 3 after washing.

  The cleaning switching device 21 attached to the lower side of the cleaning tank 2 shown in FIG. 1 supplies the cleaning water of the cleaning pump 7 to the upper nozzle body 5, the lower right nozzle body 4a, and the lower left nozzle body 4b as will be described later. Or to the upper / lower nozzle bodies simultaneously.

  FIG. 3A shows a longitudinal sectional view of the cleaning switching device 21, and FIG. 3B shows a bottom view of the cleaning switching device 21. Each figure shows a state where the position of the switching valve 23 is set to the drainage position.

  The cleaning switching device 21 includes a switching main body case 22, a flat plate-like and circular switching valve 23, a branch duct 24, and an electric motor 25 that rotates the switching valve 23.

  The switching main body case 22 has a cylindrical shape, has an outlet that joins the branch duct 24 at the top, has a bottom at the bottom, and has an inlet 26 at the side. A flange portion 35 is provided around the outflow port.

  The bottom bearing portion 27 is formed integrally with the main body case 22. As the material, polyacetal or polyethylene is used. The shaft is rotated at a low speed of 5 to 20 revolutions per minute to increase the speed reduction ratio and produce torque. As a result, the electric motor is made smaller and installed at the bottom of a narrow cleaning tank.

  The bearing portion 27 rotatably supports the valve rotating shaft 28 and holds a shaft seal member on the upper side (inside) of the bearing portion 27. The valve rotation shaft 28 is attached by fitting a boss hole provided at an eccentric position of the switching valve 23. The boss hole is prevented from rotating with respect to the valve rotation shaft 28, but is slidable in the axial direction.

  The motor 25 is a small synchronous motor. The rotation of the electric motor 25 is output via a reduction gear. The output shaft 29 is attached by being fitted into a connection hole of the valve rotation shaft 28. The fitting between the connecting hole and the output shaft 29 is prevented from rotating with respect to the rotation direction.

  The output shaft 29 is provided with a cam 30 (shown by a dotted line). This cam 30 is provided with a cam switch 31 (origin position detection sensor) that is turned on and off.

  The cam 30 has a cam projection 33 that is turned on only once by pushing the lever 32 of the cam switch 31 by one rotation. An ON signal for turning on the cam switch 31 is used as an origin position signal of the switching valve 23.

  The branch duct 24 has an upper side communicating with the lower nozzle right channel 24a1 communicating with the lower right nozzle body 4a described above, a lower nozzle left channel 24a2 communicating with the lower left nozzle body 4b, and the upper nozzle body 5. Nozzle passage 24b.

  In the center of the branch duct 24, a partition wall 24c for upper and lower branches is provided. The partition wall 24c divides the inlet 24d facing the opening at the upper portion of the switching main body case 22 into the lower nozzle right channel 24a1, the lower nozzle left channel 24a2, and the upper nozzle channel 24b. . The lower flow path is further branched left and right by a partition wall 24c1.

  The branch duct 24 and the switching main body case 22 are attached to the lower side of the cleaning tank 2. That is, a cylindrical drop part 34 whose bottom is opened is provided in the lower part of the cleaning tank 2. The outlet of the switching main body case 22 is brought into contact with the lower surface side of the drop portion 34, and the flange portion 35 is attached to the lower surface side of the cleaning tank 2 with a seal member interposed therebetween.

  A branch duct 24 is attached to the upper surface side of the drop portion 34. The inlet 24 d of the branch duct 24 is attached so as to fit into the drop-in part 34.

  In the configuration of the cleaning switching device 21 in the present embodiment, the switching valve 23 is moved in the axial direction by the water pressure of the cleaning pump 7 to switch the tributary, and the position of the switching valve 23 in the rotational direction is driven by an electric motor. The gap between the drop-in part 34 and the switching valve 23 may be a minimum gap that allows the switching valve 23 to rotate smoothly. When the washing pump 7 is activated and water pressure is applied to the switching valve 23 and moves upward, the moving distance is short and the collision noise is reduced, so that it is not necessary to use a damper such as rubber for the switching valve.

  FIG. 4 shows a partial view of the branch duct 24 and the switching valve 23 of the cleaning switching device 21 in one embodiment of the present invention. The branch duct 24 is separated from the upper and lower sides by a partition wall 24c. The lower nozzle channel is divided into a lower nozzle right channel 24a1 and a lower nozzle left channel 24a2 by a partition wall 24c1, and the upper nozzle channel 24b has a structure in which the outlet side is blocked by a closed partition wall 24b1. ing.

  In this embodiment, the closed partition wall 24b1 is provided at the projection portion of the upper nozzle channel 24b, but the upper nozzle channel 24b may not be provided behind the closed partition wall 24b1.

  In the present embodiment, the switching valve 23 of the cleaning switching device 21 has a 1/4 circular hole 200 opened. In this embodiment, there are four switching patterns of the upper nozzle, the left side of the lower nozzle, the right side of the lower nozzle, and the fully closed (drainage), so the movement angle per pattern is 360 / (3 + 1) = 90 degrees. It has become. That is, the number of switching patterns is the circulation water channel + drainage (closed partition wall) of each nozzle body. As shown in FIG. 4, the position where the hole 200 of the switching valve 23 and the closed partition wall 24b1 coincide with each other is set as the drainage position.

  In this state, the outlets of the cleaning pump are all blocked, and the cleaning water does not circulate through the upper and lower nozzles. At this position, the cam switch 31 is turned off to reach the origin position.

  The circuit will be described with reference to FIG. The control means (microcomputer) 40 computes various signals from the input means 41, the water temperature sensor 42, the water level sensor 43, and the cam switch 31 to control the drive control means 46, and also controls various displays on the display means 47. .

  The power supply circuit 48 supplies commercial power to the control means (microcomputer) 40 in place of low-voltage direct current. The drive control means 46 drives the water supply valve 50, the washing pump electric motor 9, the heater 60, the blower fan electric motor 61, and the switching electric motor 25 in accordance with control instructions from the control means (microcomputer) 40.

  Based on said structure, the operation | movement using the switching valve 23 in the dishwasher in a present Example is demonstrated.

  When an operation instruction for washing is issued from the control means 40 according to the operation instruction of the input means 41, first, before introducing tap water from the outside, drainage is performed in order to surely eliminate the washing water retained in the dishwasher. The process is carried out. At this time, the hole 200 of the switching valve 23 of the cleaning switching device 21 is placed at a position corresponding to the closed partition wall 24b1, and the drainage process is performed.

  After the drainage process is completed, when the tap water is introduced to enable cleaning, the electric motor 9 starts operating to operate the cleaning pump 7. The pressurized washing water sent from the washing pump 7 is supplied to the washing switching device 21. The switching valve 23 that was originally in the drainage position also starts the operation of switching the circulation channel by driving the electric motor 25.

  By driving the electric motor 25, the switching valve 23 rotates and moves from the closed partition wall 24b1 to the position where the circulating water channel communicates with the upper nozzle body 5, and the upper nozzle passage 24b is opened and the wash water pressurized by the upper nozzle body 5 is supplied. Supplied.

  The upper nozzle body 5 is composed of a plurality of nozzle bodies, and the number of cleaning water jets is larger than that of the lower nozzle body for jetting cleaning water alone, but jets downward from the top surface of the cleaning tank 2. It can be made to eject from each upper nozzle body 5 with the ejection power required to make it. Therefore, a necessary cleaning effect can be obtained for all tableware from above.

  In addition, by flushing the cleaning water from the top surface like the upper nozzle body 5, the cleaning water can be applied to the upper basket regardless of whether the dirt surface of the small dish is set forward or sideways. The degree of freedom increases, and even if a small plate is mistakenly placed in a direction different from the designated direction, the washing water can be reliably applied.

  Next, the hole 200 of the switching valve 23 communicates with the lower nozzle left channel 24a2 by the rotation of the switching valve 23, the upper nozzle channel 24b is fully closed, and the ejection of the washing water from the upper nozzle body 5 is stopped. Then, the ejection starts from the lower left nozzle body 4b.

  Here, depending on the cleaning course setting of the input means 41, the driving of the electric motor 25 is stopped, and it is longer than the normal cleaning course setting with respect to the cup or the hot water smelt just above the lower left nozzle body 4b. Cleaning may be performed by ejecting cleaning water. This is set as a course exclusively for glass cleaning. Thereby, it becomes possible to wash | clean efficiently with respect to the tableware for drinks used many times temporarily.

  Next, the hole 200 of the switching valve 23 rotates to fully close the lower nozzle left flow path 24a2, open the lower nozzle right flow path 24a1, and eject the washing water from the lower left nozzle body 4b. It stops and the ejection from the lower right nozzle body 4a is started.

  When the ejection of the washing water from the lower right nozzle body a ends with the rotation of the switching valve 23, the hole 200 of the switching valve 23 overlaps the closed partition wall 24b1, and the ejection of the washing water from all the nozzle bodies is once performed. Stop.

  While the process is being executed as the cleaning process, the rotation of the electric motor 25 is continued and the cleaning water is ejected from the upper nozzle body 5 again. This ejection cycle is continued during the washing process to wash the dishes in the washing tank 2. Further, after supplying the cleaning water to the upper nozzle flow path 24b, the cleaning water may be supplied to the lower nozzle right flow path 24a1 first instead of supplying the cleaning water to the lower nozzle left flow path 24a2. good. In this case, it is only necessary to change the positions of the lower nozzle right channel 24a1 and the lower nozzle left channel 24a2 in FIG.

  When the cleaning process is completed, the cleaning water is drained. At this time, the hole 200 of the switching valve 23 of the cleaning switching device 21 is placed at a position corresponding to the closed partition wall 24b1, and the drainage process is performed. After this, water is supplied again and a rinsing process is performed. A plurality of rinsing strokes are performed as necessary, and during that time, during the drainage stroke, the hole 200 of the switching valve 23 of the cleaning switching device 21 is placed at a position corresponding to the closed partition wall 24b1, and the drainage stroke is performed.

  And in the last rinse process, it heats, rinsing the tableware in the washing tank 2 with high temperature rinse water, and performs a drying process after a drainage process.

  As described above, the washing water sent from the washing pump 7 flows into the switching main body case 22 from the suction port 26 of the washing switching device 21, flows from the outlet to the branch duct 24 side, and flows into the upper nozzle flow by the switching valve 23. The upper nozzle body 5, the lower left nozzle body 4b, and the lower right nozzle body 4a are reached via the path 24b, the lower nozzle left flow path 24a2, and the lower nozzle right flow path 24a1.

  The change of the set position of the switching valve 23 is performed by driving the switching electric motor 25. By controlling the operation time of the electric motor 25, the switching valve 23 is set at a predetermined position. The control of the operation time will be described with reference to FIG. 6 showing the relationship between the rotation angle and the operation time.

  Since the detection signal of the cam switch 31 (origin position detection sensor) is generated once while the switching valve 23 rotates once (2π), one rotation of the switching valve 23 is measured by measuring the time between the detection signals. Time T is obtained.

  When the number of poles of the synchronous motor is P and the operating frequency is F (Hz), the rotational speed of the synchronous motor is 120 F / P (r / m), and the one rotation time T is 60 / N (seconds). Since one rotation time changes with the frequency of a power supply, the microcomputer detects the change in frequency and controls the rotation time corresponding to the position of the switching valve.

  The state position where the lower nozzle left flow path 24a2, the lower nozzle right flow path 24a1, and the upper nozzle flow path 24b are closed is the origin position during drainage. From this state, in the case of the present embodiment, the switching valve 23 rotates in the clockwise direction, and the position where the upper nozzle flow path 24b is opened from the fully closed state of the waste water circulation, that is, π / 2, the lower nozzle left flow path 24a2 is opened. The position where the lower nozzle flow path 24a is opened, that is, the rotation angle of 3/2 · π. If it recalculates to operation time, it will become 1/4 * T, 1/2 * T, and 3/2 * T.

  Therefore, each time the valve is operated for ¼ · T hours from the point where the detection signal of the cam switch 31 (origin position detection sensor) is detected, the switching valve 23 sequentially moves from the position where the circulating water channel is fully closed to the upper nozzle channel. The position can be changed in the order of 24b, the lower nozzle left channel 24a2, and the lower nozzle right channel 24a1.

  For example, the opening time of the lower nozzle right flow path 24a1 may be controlled to be long in order to apply the washing water to the tea bowl placed on the right side of the upper basket in FIG. 2 for a long time. Rice grains with strong adhesion can be washed intensively.

  FIG. 7 is a simplified diagram of a circulatory system showing an embodiment of the present invention. The cleaning water in the cleaning tank 2 is introduced from the water intake port 70 to the cleaning water intake port 71 of the cleaning pump 7. The cleaning water taken in by the cleaning pump 7 is pressurized, and the cleaning switching device 21 passes through the lower nozzle left channel 24a2, the lower nozzle right channel 24a1, and the upper nozzle channel 24b, respectively. It ejects from the lower left nozzle body 4b, the lower right nozzle body 4a, and the upper nozzle body 5.

  Similarly, the waste water is taken in from the water intake port 70, passes through the branch portion 73 of the common circulation path 72, passes through the drainage intake port 74, and is drained through the drainage hose 75 by the drainage pump 8.

  The cleaning pump 7 and the drainage pump 8 are operated by the same electric motor 9 so as to perform cleaning during forward rotation and drainage during reverse rotation. Further, when comparing the pumping capacity of the amount of water for washing and drainage, in this embodiment, washing is larger at 30-50 liters / minute and wastewater is 8-12 liters / minute.

  As a form of the pump, the cleaning side is a spiral pump, and the drain side is also a thin spiral pump. For this reason, when the drainage pump 8 is operated during drainage, the cleaning pump 7 exerts a slight pump action despite the reverse rotation.

  For example, when the position of the switching valve 23 of the cleaning switching device 21 is at a position where it is circulated to each nozzle body, cleaning water is ejected from the nozzle body. Then, the washing water stays in the circulation channel and the washing tank.

  When the drainage pump 8 is stopped, the washing water becomes return water and collects at the water intake 70. Therefore, it becomes necessary to operate the drainage pump 8 again.

  If the drainage stroke is completed in this state, there is no washing water for operating the drainage pump 8 sufficiently with only the return water, so that air cannot be pumped in the pump. For this reason, conventionally, since the operation is stopped once in the middle of drainage and then restarted, the drainage operation is performed in a state where some air is entrained, and it is inevitable that the pump efficiency decreases and the noise increases due to air entrapment.

  In this embodiment, the cleaning water is completely closed in the cleaning switching device 21 during drainage, and the return water from the nozzle body is eliminated. Since the circulating water volume can be kept in the circulating water channel from the intake port to the washing switching device, the return water is reduced and the draining operation can be completed at one time. Therefore, drainage efficiency was increased, drainage time was reduced, and noise caused by air entrainment was reduced.

  Further, since the switching valve corresponds to each nozzle body, the pressurized water supply amount of the cleaning water by the cleaning water pump can be reduced. Therefore, even if the capacity of the washing pump is not increased in order to increase the washing power, the washing water per nozzle is compared with a dishwasher that uses a flow path and supplies washing water to multiple nozzle bodies at the same time. The amount of eruption can be increased. Accordingly, the cleaning performance can be improved.

  In this embodiment, the position accuracy of the switching valve 23 can be increased so that the washing water does not circulate during drainage. Thereby, the width of the partition wall 24c can be narrowed, and the washing water outlet area can be increased.

1 is a cross-sectional view of a dishwasher according to an embodiment of the present invention. 1 is a vertical and horizontal cross-sectional view of a dishwasher according to an embodiment of the present invention. The present invention relates to an embodiment of a cleaning switching device which is a main part of the present invention, and shows an operation state during drainage by a switching valve. The embodiment relates to the embodiment of the cleaning switching device which is the main part of the present invention, and shows the state of the fully closed combination position in the drained state. It is a circuit diagram concerning the Example of this invention. The operation | movement of the switching valve which shows the Example of this invention is shown. 1 shows a simplified diagram of a circulatory system showing one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Cleaning tank, 5 ... Upper nozzle body, 21 ... Cleaning switching device, 23 ... Switching valve, 25 ... Electric motor, 31 ... Cam switch (origin position detection sensor).

Claims (5)

  First and second lower nozzle bodies provided on the lower side in the cleaning tank and having a plurality of jet ports for jetting water upward, and provided on the upper side in the cleaning tank and jetting water downward. An upper nozzle body having a plurality of spouts, a cleaning pump for supplying water to water passages communicating with each of the first and second lower nozzle bodies and the upper nozzle body, and water in the cleaning tank to the outside The drainage pump for discharging, the electric motor for driving the washing pump and the drainage pump, the water passage leading to the first lower nozzle body, the second lower nozzle body, and the upper nozzle body and the washing The water channel is provided between the pump and the water channel leading to the upper nozzle body, the first lower nozzle body, and the second lower nozzle body when water is supplied from the cleaning pump, and the water channel when draining. A switching device that fully closes the Example was a dishwasher.   2. The dishwasher according to claim 1, wherein the electric motor drives the washing pump and the drainage pump by switching between forward and reverse rotations.   2. The dishwasher according to claim 1, wherein the switching device sequentially executes switching of the water channel and full closing of the water channel.   2. The dishwasher according to claim 1, wherein an origin position of the switching device is a fully closed position of the water channel. 2. The dishwasher according to claim 1, wherein the upper nozzle body includes a plurality of nozzle bodies, and water is supplied through one water channel.

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