JP4367242B2 - Pump and dishwasher with this pump - Google Patents

Description

  The present invention relates to a dishwasher for washing a pump and dishware.

Conventionally, a configuration as shown in FIG. 8 has been considered for a washing pump of this type of dishwasher, for example. That is, the pump 51 includes a first casing 53 having a first impeller 52 for injecting cleaning water from a cleaning nozzle (not shown), and a second impeller 54 for discharging the cleaning water outside the machine. A second casing 55 is provided, and the first impeller 52 and the second impeller 54 are coaxial, arranged in the vertical direction, and driven to rotate by a motor 56. And the washing water guide part 57 is provided between the 1st casing 53 and the 2nd casing 55 (for example, refer patent document 1).
JP-A-9-131292

  However, according to the above-described configuration, the pump 51 is generally configured by a centrifugal pump capable of obtaining a strong cleaning power. The cleaning water guide portion 57 is provided below the first casing 53 to provide cleaning water. Is configured to be sucked from below. In addition, since the drainage pump is further configured below the cleaning water guide portion 57 provided below the cleaning pump, the overall height of the pump 51 including the motor 56 is increased, and below the cleaning tank. When installed, there was a problem that the main body of the dishwasher could not be miniaturized.

  Therefore, the impeller can be reversed in the forward and reverse directions, and the cleaning water is discharged to the cleaning nozzle at the time of normal rotation to perform cleaning, the discharge port to discharge the cleaning water at the time of reverse rotation, and the discharge port that performs this drainage. By configuring the outlet to open and close with a valve body, it becomes possible to configure a washing pump having a drainage function with a single pump, reducing the overall height of the pump and making it possible to downsize the dishwasher. .

  However, according to the above configuration, when the valve body moves to a position where the discharge port is opened, the impeller rotates in one direction, the washing water flows in the annular flow path, and the pressure of the flow of the pre-purified water Thus, the valve body is biased to a position where the discharge port is opened. However, since the valve body exists in the annular flow path with a space around the valve body, the valve body tends to flow through the annular flow path except for the wash water that has flowed into the discharge port. In this case, since the annular channel is gradually narrowed in the direction in which the washing water flows, the washing water is clogged near the starting point of the annular channel, and the pressure near the starting point increases. As the impeller continues to rotate, the pressure between the starting point and the valve body increases, and the pressure on the upstream side and the downstream side of the flow of washing water across the valve body is reduced on the downstream side. However, the behavior of the valve body becomes unstable, the valve body moves to a closed state, and it becomes impossible to discharge the wash water.

  This invention solves said subject and it aims at maintaining a valve body in the stable state in the open position.

To achieve the above object, the pump and dishwasher having the same of the present invention, a valve body for opening and closing the discharge port is provided, In no event where the valve body is in the open position, the impeller and the casing The flow path area of the gap formed between the casing cover and the valve body is configured to be smaller than the minimum cross-sectional area of the annular flow path, and the valve body is formed by the inclined surface provided at one end being pushed by washing water. Move to the open position.

  Thereby, the valve body can be maintained in a stable state in the open position, and a smooth flow of washing water can be maintained. Moreover, the washing body moves the valve body to the open position by pushing the inclined surface.

  The pump of this invention and the dishwasher provided with this pump can maintain a valve body in the stable state in the open position, and can maintain the flow of smooth washing water.

The first invention includes a casing having a scroll shape in plan view, an impeller disposed in the casing, a casing cover that forms an annular flow path with a side wall of the casing and an outer peripheral edge of the impeller, A suction port provided in the casing or the casing cover facing the opening of the impeller, a plurality of discharge ports provided in the casing or the casing cover, and a motor capable of rotating the impeller forward and backward. One of the plurality of discharge ports is movable between a closed position that closes the discharge port and an open position that opens the discharge port and is located in a part of the annular flow path. a valve body provided with, in no event where the valve body is in said open position, and the impeller and the casing and the casing cover flow area of the gap to be formed between the valve body, said annular flow Road The valve body is configured to be smaller than the minimum cross-sectional area, and the valve body moves to the open position when the inclined surface provided at one end is pushed by the wash water, so that the wash water that passes through the gap outside the valve body flows into the annular flow path. The pressure of the portion where the annular flow path is narrowed is not increased, and the washing water circulates smoothly. This stabilizes the behavior of the valve body at the open position. Moreover, the washing body moves the valve body to the open position by pushing the inclined surface.

  In the second aspect of the invention, the flow passage area of the gap between the valve body and the casing and the flow passage area of the gap between the valve body and the casing cover are set to be approximately equal, so that both sides of the valve body are The amount of wash water that comes off is equal on the casing side and the casing cover side, and the behavior of the valve body in the open position is more stable.

  3rd invention is equipped with the main body of the dishwasher, the inside of the said main body, the washing tank which has an opening part which takes in and out dishes, and the washing nozzle which discharges washing water, The washing | cleaning to the said washing nozzle A dishwasher equipped with the pump of the first invention or the second invention as a pump for pumping water and discharging washing water to the outside of the washing increase, and the main body of the dishwasher can be downsized with one pump At the same time, the valve body of the pump can be maintained in a stable state at the open position, and by maintaining a smooth flow of washing water, the washing water can be reliably discharged out of the machine.

  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)
1-4, 1 is the washing tank formed in the main body 2 of a dishwasher, and installs the tableware basket 3 which sets the tableware to wash | clean so that it can take out. A water reservoir 4 for storing water is provided at the bottom of the cleaning tank 1. Water supply to the washing tank 1 is performed through a water supply valve 5, and a water level detecting means 6 for detecting the water level is provided so as to keep the supplied water at a predetermined water level. 7 is a pump that pressurizes the water stored in the water storage unit 4. The rotary shaft 9 of the impeller 8 in the pump 7 and the rotary shaft 9 of the motor 10 that is the drive source of the pump 7 are concentric and arranged in a substantially vertical direction. The pump 7 is arranged below the motor 10. Reference numeral 11 denotes a suction path through which cleaning water flows into the pump 7 and is provided between the pump 7 and a motor 10 that drives the pump 7.

  Reference numeral 12 denotes a seal portion for sealing the rotating shaft 9 of the motor 10, which is provided between the impeller 8 of the pump 7 and the motor 10, and is configured so as to be surrounded by the suction path 11 by protruding into the suction path 11. is doing. Reference numeral 13 denotes a lid constituting the suction passage 11, which is fixed in a watertight manner via a packing 14, and the sealing portion 12 is provided on the lid 13.

  15 is a scroll-shaped casing provided in the lower part of the impeller 8 of the pump 7, and 16 is a casing cover provided in the upper part of the impeller 8 and forming an annular flow path between the casing 15 and the outer peripheral edge of the impeller 8. Reference numeral 17 denotes a suction port provided in the casing cover 16, and the suction port 17 is configured to supply cleaning water to the inside of the impeller 8. The casing 15 is provided with a first discharge port 18 and a second discharge port 19, in the vicinity of the inside of the second discharge port 19, a closed position for closing the second discharge port 19, and an open and annular shape. A valve body 20 that is movable between an open position located in a part of the flow path is provided, and a seal when the second discharge port 19 is closed by attaching a packing 21 to the valve body 20 is provided. The sex is secured.

  When the valve body 20 opens the second discharge port 19 and is in the open position, the flow path area a formed between the casing 15 and the casing cover 16, the impeller 8, and the valve body 20 is as follows. It is set smaller than the minimum area b of the annular flow path formed between the casing cover 16 and the impeller 8.

  The impeller 8 is a centrifugal type that can be reversed forward and backward. During forward rotation, the cleaning water is discharged from the first discharge port 18 and supplied to the cleaning nozzle 22, and is injected into the cleaning tank 1 from the injection port 23. The cleaning nozzle 22 is provided so as to be rotatable in the horizontal direction, and is rotated by a reaction force when the cleaning water is injected from the injection port 23 so that it can be injected in a wide range in the cleaning tank 1. At the time of reversal, the cleaning water is discharged from the second discharge port 19 to the outside of the apparatus and drained.

  A heater 24 heats the water stored in the water storage unit 4 and heats the air supplied into the cleaning tank 1 by a blowing means (not shown) during drying. Reference numeral 25 denotes a filter that supplements leftovers attached to the tableware. Reference numeral 26 denotes a control means for controlling the operation of the dishwasher, such as the motor 10 and the air blowing means.

  Next, the operation in the above embodiment will be described. First, tap water is supplied to the inside of the washing tank 1 through the water supply valve 5 by the control means 26, stored in the water storage section 4 provided at the bottom of the washing tank 1, and reaches a predetermined water level by the water level detection means 6. By the way, water supply is stopped. Next, the pump 7 rotates forward, and the washing water in the water storage section 4 is pressurized by the pump 7 and enters the pump 7 through the suction passage 11 through the suction port 17 provided in the upper part of the impeller 8 to be washed. Water flows through the annular channel in the direction of arrow A. The valve body 20 receives a force caused by this water flow on a surface that does not come into contact with the second discharge port 19, and the valve body 20 comes into contact with the second discharge port 19 so as to be pressed and is closed. As a result, the cleaning water is discharged from the first discharge port 18 and supplied to the cleaning nozzle 22 and is sprayed from the injection port 23 toward the tableware placed in the tableware basket 3 in the cleaning tank 1 for cleaning.

  The wash water from which the dishes have been cleaned returns to the water storage unit 4 again. The cleaning water is heated by the heater 24 and becomes a moderately high temperature set in advance to increase the cleaning power. Contaminants of the cleaning water that has been cleaned are captured by the filter 25 and circulate to the pump 7 again. To prevent the reattachment of contaminants during cleaning. When the predetermined cleaning is completed, the pump 7 is reversed and the cleaning water is discharged from the second discharge port 19 to the outside of the apparatus for draining.

In this drainage process, during the reversing operation of the pump 7, the washing water flows in the direction of arrow B in the opposite direction to the normal rotation operation, and the washing water is a free end opposite to the rotating shaft 27 of the valve body 20. The inwardly inclined surface 28 provided on the side is pushed, and the valve body 20 is displaced in the opening direction of the second discharge port 19 and moved to the open position. At this time, the washing water passing through the channel area a flows through the annular channel and reaches the minimum area b of the annular channel, but (channel area a)> (minimum area b of the annular channel). The clogged water is clogged with the minimum area b of the annular channel, and the pressure near the minimum area b of the annular channel increases. If the reversing operation is continued as it is, the range of the high pressure gradually expands, and when the valve body 20 is reached, the pressure on the non-contacting surface is higher than the surface contacting the second discharge port 19 of the valve body 20. The valve body 20 becomes higher and a force acts in a direction in which the valve body 20 tries to close the second discharge port 19, and the behavior of the valve body 20 becomes unstable.

  However, as shown in FIG. 4, by setting (channel area a) <(minimum area b of the annular channel), the cleaning water is not clogged with the minimum area b of the annular channel, and the cleaning water is smooth. The flow and the pressure balance in the valve body 20 are not disrupted, and the valve body 20 is stable at the open position and can be drained normally.

  Further, as shown in FIG. 5, the flow path area c of the gap between the valve body 20 and the casing 15 and the flow path area d of the gap between the valve body 20 and the casing cover 16 are substantially equal. As a result, the amount of washing water passing through both side surfaces of the valve body 20 becomes substantially equal, the pressure received by the valve body 20 becomes uniform, and the behavior at the open position becomes more stable.

  As described above, according to the present embodiment, the casing 15 having a scroll shape in plan view, the impeller 8 disposed in the casing 15, the side wall of the casing 15 and the outer peripheral edge of the impeller 8 are annular. A casing cover 16 forming a flow path, a suction port provided in the casing 15 or the casing cover 16 so as to face the opening of the impeller 8, and a plurality of discharge ports 18 provided in the casing 15 or the casing cover 16; 19 and a motor 10 capable of rotating the impeller 8 forward and backward, one of the plurality of discharge ports 18 and 19 is closed at a closed position, and the discharge port is opened. And a valve body 20 that is movable between an open position located in a part of the annular flow path and the valve body 20 is in the open position. Since the flow passage area a of the gap formed with -16 is smaller than the minimum cross-sectional area b of the annular flow passage, the behavior of the valve body 20 at the open position is stabilized and smooth drainage is possible. It becomes.

  Further, by adopting a configuration in which the flow path area c of the gap between the valve body 20 and the casing 15 and the flow path area d of the gap between the valve body 20 and the casing cover 16 are substantially equal, The pressure received by 20 becomes uniform, and the behavior at the open position becomes more stable.

(Embodiment 2)
As shown in FIG. 5, the valve body 20 of the pump 7 has a rotatable rotating shaft 27. The rotary shaft 27 is provided in the substantially vertical direction that is the same as the rotary shaft 9 of the impeller 8. A convex portion 30 is provided at one end of the rotating shaft 27 and a concave portion 31 is provided at the other end. A receiving portion 32 into which the convex portion 30 is fitted and a support portion 33 into which the concave portion 31 is fitted are provided in the casing 15 or the casing cover 16. ing. The rotating shaft 27 is sandwiched between the casing 15 and the casing cover 16 so that the receiving portion 32 is located above and the support portion 33 is located below.

  The pump 7 can reverse the impeller 8 in the forward and reverse directions, and discharges the cleaning water to the cleaning nozzle 22 at the time of forward rotation and the first discharge port 18 for cleaning, and discharges the cleaning water at the time of the reverse to discharge outside the machine. A second discharge port 19 for performing the above is provided. In accordance with the washing and draining operations, the valve body 20 rotates about the rotation shaft 27 in the direction of opening or closing the second discharge port 19. Since the washing water contains foreign matters washed away from the tableware, when the foreign matter enters the fitting portion between the rotary shaft 27 and the casing 15 and the casing cover 16, the operation of the valve body 20 is performed. It causes troubles, and it becomes difficult to operate accurately according to the flow direction of the washing water.

However, according to this structure, since the receiving part 32 which inserts the convex part 30 of the rotating shaft 27, and the recessed part 31 which inserts the support part 33 are set as the structure which each opens below, the foreign material contained in cleaning water Since it does not remain in the fitting portion of the rotating shaft 27 and foreign matter is removed, it does not lead to sticking or wear of the rotating shaft 27, and the reliability of the operation of the valve body 20 can be ensured. It becomes.

(Embodiment 3)
FIG. 6 is a time chart showing the operation of the pump 7 according to the third embodiment. The rotation of the impeller 8 is changed to the first predetermined direction in the direction in which the valve body 20 moves to the open position where the second discharge port 19 is opened. After driving for time t1, the impeller 8 is stopped for a second predetermined time t2, and then the impeller 8 is rotated again in the direction in which the valve body 20 moves to the open position where the second discharge port 19 is opened. The predetermined time t3 is driven.

  The first predetermined time t1 is set to, for example, about several seconds, specifically 3 to 5 seconds. The second predetermined time t2 is set to be approximately the same as the first predetermined time t1, and is specifically 3 to 5 seconds. The third predetermined time t3 is a time during which the wash water in the water storage section 4 can be discharged out of the apparatus, specifically 60 to 90 seconds.

  According to this sequence, the valve body 20 rotates when the impeller 8 rotates in the reverse direction and receives the pressure of the washing water in the direction in which the valve body 20 is about to move to the open position where the second discharge port 19 is opened. Even if the second discharge port 19 remains closed due to an external force such as sticking of the shaft 27 and packing or a pressure balance near the valve body 20, the second discharge port 19 is opened again. Since a force is applied in the direction in which the valve is moved, the valve body can be reliably operated and the reliability is improved.

  Further, since the first predetermined time t1 is shorter than the third predetermined time t3, the valve body 20 can be accurately operated in a short time. In addition, since the first predetermined time t1 and the second predetermined time t2 are substantially equal, the force is applied to the valve body 20 in the direction of opening the second discharge port 19, and then the force is applied next. Can be made relatively short, and the second discharge port 19 can be opened more reliably.

(Embodiment 4)
FIG. 7 is a time chart showing the operation of the pump 7 of the fifth embodiment, in which the first predetermined time t1 is longer than the second predetermined time t2, and the second predetermined time t2 is the embodiment. It is the same as 3 and is set to about several seconds, for example, specifically 3 to 5 seconds. The first predetermined time t1 is longer than this. Thereby, it becomes possible to apply a long force to the valve body 20 in the direction in which the second discharge port 19 is opened, and the operation of the valve body can be made accurate.

  Note that the configuration described in the embodiment does not necessarily have to be integrated, and can be implemented independently.

  As described above, the pump according to the present invention and the dishwasher equipped with the pump can improve the reliability of the operation of the valve body for switching between washing and drainage. As a dishwasher equipped with the pump and the pump, Useful.

Sectional drawing of the dishwasher of Embodiment 1 of this invention Expanded sectional view of the pump and motor of the dishwasher Internal plan view of the dishwasher pump with the second discharge port closed Internal plan view of the dishwasher pump with the second discharge port open Sectional drawing of the principal part of the pump of the dishwasher of Embodiment 2 of this invention Time chart which shows operation | movement of the pump of the dishwasher of Embodiment 3 of this invention Time chart which shows operation | movement of the pump of the dishwasher of Embodiment 4 of this invention Cross-sectional view of the main parts of a conventional dishwasher

DESCRIPTION OF SYMBOLS 1 Cleaning tank 2 Main body 7 Pump 8 Impeller 10 Motor 15 Casing 16 Casing cover 17 Suction port 18 1st discharge port 19 2nd discharge port 20 Valve body 22 Cleaning nozzle

Claims (3)

A casing having a scroll shape in plan view, an impeller disposed in the casing, a casing cover that forms an annular flow path with a side wall of the casing and an outer peripheral edge of the impeller, and facing the opening of the impeller And a plurality of discharge ports provided in the casing or the casing cover, a plurality of discharge ports provided in the casing or the casing cover, and a motor capable of rotating the impeller forward and backward. One of them is provided with a valve body that is movable between a closed position that closes the discharge port and an open position that opens the discharge port and is located in a part of the annular flow path, in no event where the valve body is in the open position, the flow area of the gap to be formed between the impeller and the casing and the casing cover and the valve body, the minimum cross-sectional area of the annular channel Pump small constructed, the valve body is moved by the inclined surface provided at one end is pushed into the washing water in the open position. The pump according to claim 1, wherein the flow path area of the gap between the valve body and the casing and the flow path area of the gap between the valve body and the casing cover are set to be substantially equal. A dishwasher body, a washing tank provided in the body and having an opening for taking in and out dishes, and a washing nozzle for discharging washing water, pumping washing water to the washing nozzle and washing A dishwasher equipped with a pump according to claim 1 or 2 as a pump for discharging water to the outside of the additional washing.

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