JP3787918B2 - Dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a dishwasher provided with a cleaning means for injecting cleaning water, and more particularly to a cleaning pump for pressurizing cleaning water.
[0002]
[Prior art]
  A conventional dishwasher will be described with reference to FIG. When washing dishes, the dishes to be washed are stored in the dish basket 62 of the washing tub 61, and the detergent is introduced to start the operation. When the operation is started, first, a water supply step of supplying a predetermined amount of cleaning water to the cleaning tank 61 is performed so that the operation of the cleaning pump 63 pressurizing the cleaning water is stabilized. The cleaning pump 63 has a centrifugal impeller 64 and an electric motor 65 that drives the centrifugal impeller 64. The suction port 66 of the cleaning pump 63 and the cleaning water surface have a substantially predetermined distance D1 (hereinafter also referred to as “cleaning water level”). Subsequently, a main washing process is performed in which the washing water pressurized by the washing pump 63 and heated by the heater 67 is jetted from the jet nozzle of the washing nozzle 68 together with the detergent. The washing water is jetted vertically or obliquely upward from the jet nozzle of the washing nozzle 68. Further, the cleaning nozzle 68 is rotated substantially horizontally by the jet reaction force. The tableware is washed by the action of the collision force, detergent, heat, etc. of the washing water sprayed from the washing nozzle 68 rotating in this way.
[0003]
  After the main washing process for a predetermined time, the process enters a draining process in which cleaning water containing dirt washed off from tableware and the like is discharged to the outside by a drain pump (not shown). Subsequently, a water supply process for newly supplying cleaning water, a rinsing process for spraying cleaning water from the cleaning nozzle 68 in order to rinse the dishes contaminated with detergent and residual vegetables (stained dishes are also referred to as residual vegetables), The draining step is continuously repeated four times to complete the cleaning step.
[0004]
  Subsequently, air is sent from the outside of the machine into the washing tank 61 via the blow duct through the blower opening to the washing tank 61 by a blower (not shown), and the heater 67 is operated intermittently to produce warm air. Then, a drying process for evaporating water droplets attached to the tableware is performed. In this drying step, the humid air in the cleaning tank 61 is discharged out of the machine through the exhaust port. In addition, 69 is a water level detection means for detecting the cleaning water level, and 70 is a control device for controlling the operation of the cleaning pump 63, the heater 67, and the like.
[0005]
[Problems to be solved by the invention]
  The tableware washing machine having the above-described conventional configuration has the following problems with respect to the washing pump 63. First, a general centrifugal pump has the operating characteristics that (1) pumping becomes impossible due to an increase in air intake amount (2) pumping is impossible even with a slight amount of air near the deadline.
[0006]
  This operating characteristic is due to the phenomenon that the inlet part of the impeller is blocked by air and the water flow is interrupted, the flow rate of water is small, and the pressure difference between the outlet and the inlet of the impeller is large. This is attributed to the phenomenon of accumulation without leakage. Therefore, in the dishwasher using the washing pump 63 of this type, the washing water can be stably pressurized, and in order to obtain washing ability, air or bubbles above a certain amount in the washing water. Should not be mixed. For example, if a general kitchen detergent is mixed, a large amount of foam is generated, and the cleaning pump 63 cannot obtain the necessary pressure. Therefore, it is necessary to use a low-foaming detergent that suppresses foaming of the circulating cleaning water. So-called “dedicated detergents” must be used.
[0007]
  Further, normally, there is a single QH characteristic indicating the relationship between the flow rate Q of the cleaning pump 63 and the discharge pressure H, and in the cleaning process, the cleaning water is injected from the cleaning nozzle 67 at a predetermined discharge pressure and flow rate. For this reason, regardless of the number of dishes to be cleaned and the quality of dirt, the circulation flow rate of the cleaning pump 63 is substantially constant, and in order to allow the cleaning water to circulate stably, a predetermined amount of cleaning water (this cleaning water amount is set to “ And a predetermined water depth at the suction portion of the cleaning pump 63 (also referred to as “cleaning water level” measured from a reference surface in the cleaning tank). In order to secure this amount and level of cleaning water, it is necessary to control the amount and level of cleaning water to be supplied in each cleaning process so that it is always within a certain range. Something expensive is needed.
[0008]
  Further, the spiral casing 71 and the discharge port 72 of the cleaning pump 63 are shaped as shown in FIG. 10, and even if the cleaning nozzle 68 is arranged above the discharge port 72, the inside of the casing 71, particularly its Since air stays in the upper part, it takes a certain time until the air is discharged from the casing 71 and the cleaning pump 63 exhibits a predetermined capacity. At the same time, the noise of air is generated and the noise is loud. Furthermore, as shown in FIG. 11, when the casing is rotated about 90 degrees so that air can be easily removed and discharged in the horizontal direction, the cleaning nozzle is arranged at the upper part of the casing, and air is supplied during the water supply process. It is necessary to make it the structure discharged | emitted upwards. Therefore, the volume of the cleaning mechanism portion is large when including from the bottom of the cleaning pump 63 to the height of the rotating portion of the cleaning nozzle 68. For this reason, a space (also referred to as a cleaning volume) for storing an object to be cleaned is narrow.
[0009]
  Further, in order to obtain a predetermined cleaning performance in the cleaning process, it is necessary to heat a predetermined amount of cleaning water to a predetermined temperature together with tableware. For this reason, the heater 67 needs to have a large heating capacity (also referred to as capacity). In addition, heating by the heater 67 requires a long time, and the amount of water used in the cleaning operation, the amount of power consumption, and the operation time are required.
[0010]
  As another conventional example, as shown in FIG. 12, there is a dishwasher with the electric motor of the washing pump 80 as the vertical axis. Further, in order to execute the above-described cleaning process and drying process, in addition to the cleaning pump 80, a drainage pump 81 and a blower 82 are required. Reference numerals 83, 84, and 85 denote electric motors that drive the impellers 86, 87, and 88 of the cleaning pump 80, the drainage pump 81, and the blower 82, respectively. Thus, since three motors for driving the mechanism for cleaning and drying are required, the number of parts is large and the structure is complicated. Moreover, the ratio of these mechanism parts to the entire volume of such a conventional dishwasher is large. That is, the volume for storing tableware is small, and the size of the tableware that can be stored is limited.
[0011]
  The basic characteristics of the washing pump 80 are the same as in the above example. The cleaning nozzle 89 is disposed above the cleaning pump 80, and when cleaning water is supplied, the air in the cleaning pump 80 is pushed upward in a short time and discharged from the cleaning nozzle 89 to clean the inside of the casing. It can be filled with water. Unless a special air hole is provided in the circulation path, the cleaning nozzle 89 needs to be disposed above the discharge port of the cleaning pump 80 as described above. Including the height, the volume of the cleaning mechanism is large. Therefore, also from this point, the ratio of the volume for storing tableware to the total volume of the dishwasher is small, and the maximum size of tableware that can be stored is limited.
[0012]
  This invention solves the subject which the above conventional dishwashers have. In particular, it is a washing pump having a simple centrifugal impeller and a casing, and is intended to provide a dishwasher that can circulate washing water even if air remains in the casing and obtain a predetermined washing performance. It is.
[0013]
[Means for Solving the Problems]
  The dishwasher of the present invention includes a cleaning tank for storing an object to be cleaned, a cleaning means having an ejection port for ejecting cleaning water, and a cleaning pump for pressurizing the cleaning water.And an electric motor for driving the washing pump,Wash pumpFixed to the output shaft of the motor,A first centrifugal impeller disposed substantially concentrically andSaidA second centrifugal impeller having a larger outer diameter than the first centrifugal impeller;The first centrifugal impeller and the second centrifugal impellerAnd the cleaning water suction and discharge portsProvidedWith casingThe outlet angle of the first centrifugal impeller is approximately 90 degrees or less, the outlet angle of the second centrifugal impeller is approximately 90 degrees or more, and the discharge port is a cleaning means from the casing. The casing side is located above the cleaning means side.Is.
[0014]
  According to this invention, the pressurization of the washing water is performed by rotating the first centrifugal impeller and the second centrifugal impeller arranged concentrically with the washing pump. In particular, when cleaning water is supplied in less than a predetermined amount, air is trapped in the cleaning pump, but the second centrifugal impeller, which has a large absolute velocity of the flowing out fluid, discharges the air that tends to stay in the casing. The first centrifugal impeller can pressurize the washing water by the operation to perform. The pressurized washing water passes through the second centrifugal impeller, is discharged from the discharge port, and is sent to the washing means. In this way, with a simple centrifugal impeller and casing configuration, the cleaning water can be pressurized and circulated to the cleaning means even when the water level or the amount of water fluctuates, and the tableware with a predetermined cleaning power can be obtained. A washing machine can be provided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  The invention described in claim 1 is a cleaning tank for storing an object to be cleaned, a cleaning means having an injection port for jetting cleaning water, and a cleaning pump for pressurizing the cleaning water.And an electric motor for driving the washing pump,Wash pumpFixed to the output shaft of the motor,A first centrifugal impeller disposed substantially concentrically andSaidA second centrifugal impeller having a larger outer diameter than the first centrifugal impeller;The first centrifugal impeller and the second centrifugal impellerAnd the cleaning water suction and discharge portsProvidedWith casingThe outlet angle of the first centrifugal impeller is approximately 90 degrees or less, the outlet angle of the second centrifugal impeller is approximately 90 degrees or more, and the discharge port is a cleaning means from the casing. And the casing side is formed to be higher than the cleaning means side.
[0016]
  In this invention, pressurization of the washing water is performed by rotating the first centrifugal impeller and the second centrifugal impeller substantially concentric with the washing pump. The washing water pressurized by the washing pump is sent to the washing means and is jetted onto the object to be washed from the jetting port to wash it. At this time, when the washing water is supplied less than the standard amount of water, the air is caught in the washing pump, but the absolute velocity of the fluid flowing out by rotating the first centrifugal impeller and the second centrifugal impeller at the same time Is a second centrifugal impeller that discharges air that tends to stay in the casing. By this operation, the first centrifugal impeller can pressurize the washing water, and water is discharged from the discharge port through the second centrifugal impeller. In this way, it is possible to pressurize cleaning water less than the standard amount of water and circulate it to the cleaning means, thereby obtaining a predetermined cleaning power.
[0017]
  Claim2The described invention is claimed.1In the invention, at least the first centrifugal impeller or the second centrifugal impeller in the washing step and the drying stepDriveProvided with output switching means for movingIs.
[0018]
  In the present invention, in each of the cleaning process and the drying process, the output switching means is operated in order to perform an optimum operation corresponding to the load torque of the cleaning pump and the required QH characteristics. Thereby, the output torque of the electric motor is transmitted selectively to the first centrifugal impeller and the second centrifugal impeller. When the object to be pressurized is air, since the load torque of the centrifugal impeller is generally small, the second centrifugal impeller having a large outer diameter is rotated to obtain a necessary air volume. When water is used, the centrifugal impeller has a large load torque, so the first centrifugal impeller having a small outer diameter is rotated to obtain a necessary flow rate. That is, it is possible to provide a dishwasher capable of performing washing and drying by realizing an optimum pressurizing capacity according to an object to be pressurized in each step by the operation of the output switching means.
[0019]
  Claim3The described invention is claimed.Invention of 2The output switching means includes at least a first centrifugal impeller or a second centrifugal impeller depending on the rotation direction of the electric motor.InA clutch mechanism that transmits the output torque of the motorAnd by the clutch mechanismSwitch the rotation direction of the motor between the washing process and the drying processIt is what I did.
[0020]
  In this invention, it is possible to select and operate at least the first centrifugal impeller or the second centrifugal impeller with the technical means of switching the rotation direction of the electric motor with respect to the difference in load torque between water and air. Therefore, the pressurization characteristic required for each process as a washing pump can be obtained with a smaller electric motor. Thus, the dishwasher which can be washed and dried with a single washing pump is realized.
[0021]
  Claim4The described invention is claimed.In the inventions 1 to 3,The casing of the cleaning pump is substantially circular, and at least the first centrifugal impeller or the second centrifugal impeller is disposed substantially concentrically and the discharge port is provided in a substantially radial direction.It is a thing.
[0022]
  In this invention, when pressurizing washing water in the washing process, the first centrifugal impeller rotates and the accelerated fluid has an action of efficiently recovering to static pressure by the second centrifugal impeller. . Therefore, the casing does not have to have a volute shape due to the substantially concentric arrangement. Further, since the casing shape is substantially circular and symmetrical, the pressure can be obtained as a cleaning pump regardless of the rotation direction of the electric motor, so that the degree of freedom in selecting the electric motor is high. That is, a dishwasher that achieves predetermined washing performance and drying performance with a compact and inexpensive configuration is realized.
[0023]
【Example】
  Embodiments of the present invention will be described below with reference to the drawings.
[0024]
  (Example 1)
  1 and 2, 1 is a first centrifugal impeller, 2 is a second centrifugal impeller having an outer diameter larger than that of the first centrifugal impeller 1, and 3 has a fluid suction port 4 and a discharge port 5. Casing. Reference numeral 6 denotes an electric motor that drives these centrifugal impellers, and the casing 3 includes a container body 3a that houses the centrifugal impeller, and a shaft sealing member 3b that seals fluid at an output shaft portion of the electric motor 6 inside the casing 3. It is formed with the container lid 3c. The first centrifugal impeller 1 and the second centrifugal impeller 2 are separate bodies, but are fixed to the output shaft of the electric motor 6, and the two centrifugal impellers rotate in the same manner. These are the main elements, and the cleaning pump 7 is configured.
[0025]
  Reference numeral 8 denotes a tableware basket for storing objects to be cleaned such as tableware and cooking utensils. Reference numeral 9 denotes a cleaning nozzle having an injection port for ejecting cleaning water, which is connected to the discharge port 5 of the cleaning pump 7. Reference numeral 10 denotes a cleaning tank in which the tableware basket 8 and the cleaning nozzle 9 are installed. Reference numeral 11 denotes a water level detecting means for detecting the cleaning water level. The water level detection means 11 detects the water level of the cleaning water as a pressure by a trap 12 provided at the bottom of the cleaning tank 10.
[0026]
  As shown in FIG. 1, when the rotation direction of the centrifugal impeller is clockwise, the exit angle α of the blade 8 of the first centrifugal impeller 1 is approximately 90 degrees or less. On the other hand, the exit angle β of the blade 9 of the second centrifugal impeller 2 is approximately 90 degrees or more. As a basic characteristic of such blades, the second centrifugal impeller 2 has an exit angle β of the blade 9 of approximately 90 degrees or more when the rotation direction is clockwise, so that when the centrifugal impeller rotates, Even if the peripheral speed is the same, the absolute velocity of the fluid is large due to the relationship of the outlet speed triangle, and a large suction force can be obtained even for the gas. Therefore, as compared with the first centrifugal impeller 1, there is a suction force more than that the outer diameter is large and the peripheral speed at the same rotational speed is large. On the other hand, if the first centrifugal impeller 1 is clockwise, the exit angle α of the blade 8 is 90 degrees or less, and therefore the absolute velocity of the fluid is the same even if the peripheral speed during rotation of the centrifugal impeller is the same. Is small and can convert a velocity head to a pressure head with low loss, and has a characteristic that liquid pressurization can be obtained efficiently.
[0027]
  Next, the operation of the dishwasher of this embodiment will be described. In a normal cleaning process, the first centrifugal impeller 1 and the second centrifugal impeller 2 are rotated counterclockwise by the electric motor 6 in order to pressurize the cleaning water. The water guided from the suction port 4 to the casing 6 is pressurized by the respective impellers, discharged from the discharge port 5, and can be used as a general centrifugal pump. At this time, if the output of the electric motor 6 is sufficient, it can be used in any rotation direction in the embodiment.
[0028]
  However, when the water level detection means 11 detects the washing water level at a low water level, the amount of water is small. The washing water level D2 in FIG. 2 is lower than the washing water level D1 in FIG. At this time, the amount of water is insufficient for the cleaning pump 7 to circulate with a predetermined capacity. Therefore, the water level rapidly decreases during the process, and water containing air is supplied to the cleaning pump 7. In a conventional dishwasher, when a large amount of air is mixed during operation, it is impossible to maintain a pumpable state.
[0029]
  In the present embodiment, immediately after the start of the rotation of the electric motor 6, there is a large amount of air in the first centrifugal impeller 1, and the second centrifugal impeller 2 only stirs the water in the casing 3. Therefore, the centrifugal pump 7 does not discharge liquid. However, due to the suction force of the second centrifugal impeller 2 in which the absolute velocity of the fluid flowing out from the blades 2a is large, the air staying inside the casing 3, particularly in the rotation region of the first impeller 1, is moved to the outside. The discharging operation is performed in a short time. By this operation, air disappears from the rotation region of the first centrifugal impeller 1, the surroundings of the blade 1a are filled with water, and the washing water can be pressurized with the blade 1a. As a result, the air present in the casing 3 is pushed out, and the water is discharged from the discharge port 5 through the second centrifugal impeller 2. In this way, the washing water containing air and bubbles can be pressurized and circulated to the washing nozzle 9.
[0030]
  The injection energy of the cleaning nozzle 9 at this time is slightly reduced by the amount of air mixed in compared with the normal cleaning water level when the rotational speed of the electric motor 6 is constant. Therefore, the problem that the cleaning nozzle cannot be rotated is not reached. Therefore, a predetermined cleaning power can be obtained as a dishwasher.
[0031]
  Because of the above-mentioned operation characteristics, the detection accuracy of the water level detection means is general.At the levelSince it is good, it can be set as the dishwasher which can be comprised at low cost.
[0032]
  (Example 2)
  As shown in FIGS. 3 and 4, there is a casing 22 having a fluid suction port 20 and a discharge port 21. Inside the casing 22, a first centrifugal impeller 23 and a second one similar to those in the first embodiment are provided. There are two centrifugal impellers 24. The washing pump 26 is composed of an electric motor 25 for driving these centrifugal impellers. The discharge port 21 has a gradient in which the casing 22 side is upward, and the tip side thereof is connected to the cleaning nozzle 28 via a circulation path 27. Therefore, the arrangement of the cleaning nozzle 28 is lower than that in FIG. 2, and the cleaning space formed by the tableware basket 29 and the cleaning tank 30 is large.
[0033]
  Next, the operation will be described. Since the basic operation is the same as in the first embodiment, the characteristic operation will be mainly described. In particular, even when a predetermined amount of cleaning water is supplied up to the cleaning water level D3 in the cleaning process and started up, there is a large amount of air in the casing 22 due to the residual water in the circulation path 27. In the washing pump, the condition is such that the washing water cannot be circulated. In the cleaning process, the first centrifugal impeller 23 and the second centrifugal impeller 24 are rotated clockwise by the electric motor 25. Immediately after the start of rotation of the electric motor 25, the second centrifugal impeller 24 only agitates the water in the casing 22 while a large amount of air remains in the first centrifugal impeller 23 inside the casing 22. The centrifugal pump 26 does not discharge cleaning water.
[0034]
  However, as in the first embodiment, the air suction force of the second centrifugal impeller 24, in which the absolute velocity of the fluid flowing out from the blade 24a is large, causes the inside of the casing 22, particularly the first centrifugal impeller. The operation | movement which discharges the bubble and air which remain in the rotation area | region of 23 to the outer side is made in a short time. By this operation, air disappears from the rotation region of the first centrifugal impeller 23, the periphery of the blade 23a is filled with water, and water can be pressurized by the blade 23a. As a result, the air present in the casing 22 is pushed out, and the water is discharged from the discharge port 21 through the second centrifugal impeller 24. The cleaning water is jetted from the cleaning nozzle 28, and a predetermined cleaning performance is obtained.
[0035]
  Therefore, as a dishwasher provided with such a washing pump 26 and a circulation path 27, the following effects are exhibited. First, because the washing space is large, it is easy to use when storing tableware. Second, since a detergent having a high foaming degree can be used, the degree of freedom in selecting the detergent is improved. Third, even if the cleaning water level fluctuates due to some factor and becomes a low water level and a small amount of water, the function as a cleaning pump is exhibited as in Example 1, and a certain cleaning performance is obtained. Moreover, if the water level detection accuracy is as high as the conventional one and is set to a low water level, a dishwasher with less water consumption can be obtained.
[0036]
  (Example 3)
  Since the basic configuration is the same dishwasher as in the second embodiment, this is shared and detailed description is omitted. As shown in FIG. 5, the second embodiment differs from the second embodiment in that a suction port 32 of the cleaning pump 31 is formed by a water suction port 33 that takes in cleaning water and an air suction port 34 that takes in air. . Further, a general drainage pump (not shown) is provided as the drainage means.
[0037]
  Since the basic operation in the washing process of the dishwasher is the same as that of the second embodiment, the description is omitted. Below, it demonstrates centering around operation | movement of the washing | cleaning pump 31 in the washing | cleaning process and drying process which are the characteristics of this invention.
[0038]
  In the cleaning process, the cleaning water is sent from the water suction port 33 to the cleaning pump 31, pressurized and sprayed from the injection port of the cleaning nozzle 27, and the object to be cleaned such as tableware in the tableware basket 28 is cleaned. The operation at this time is the same as that in each of the embodiments described above, including the fluctuation of the cleaning water level and the operating state at the time of startup.
[0039]
  Next, in the drying process, the washing water is discharged outside the machine by a drain pump (not shown), the suction port 32 is exposed, and the air is communicated with the outside through the air suction port 34. Here, when the cleaning pump 31 is operated, air outside the machine is sent from the intake port 34a to the cleaning pump 31 via the air suction port 34, pressurized and injected from the injection port of the cleaning nozzle 27, The objects to be cleaned such as tableware are dried by this air blowing. The humid air in the cleaning tank 29 is discharged out of the machine through the exhaust port 35.
[0040]
  That is, the dish washer can be washed and dried with a single washing pump 31 and a washing nozzle 27 as a washing means. In addition, since no other blower is required for drying, the washing / drying mechanism can be downsized and a dishwasher having an inexpensive configuration.
[0041]
  (Example 4)
  Since the basic configuration is the same dishwasher as in Example 2, this is shared and the overall configuration diagram is omitted. This embodiment is characterized in that cleaning water or air is sent to a cleaning nozzle by a cleaning pump 40 as shown in FIG. As a means for switching transmission of the output torque of the electric motor 41, a clutch mechanism 44 that selects the first centrifugal impeller 42 and the second centrifugal impeller 43 according to the rotation direction of the electric motor 41 and transmits the output torque of the electric motor 41. Is provided.
[0042]
  The clutch mechanism 44 can turn on and off the output torque depending on the rotation direction of the electric motor 41, and is generally used as a so-called “one-way clutch”. 45 has a substantially circular container body 46 in which two centrifugal impellers are housed in the casing of the cleaning pump 40, a suction port 47, and a discharge port 48 provided in a substantially radial direction on the side surface of the container body 46. ing. Reference numeral 49 denotes a shaft seal member that seals fluid at the output shaft 50 of the electric motor 41. Reference numeral 51 denotes a rotating shaft on which a clutch mechanism 44 and a shaft seal member 49 are mounted, and a second centrifugal impeller 43 is fixed to one end. Reference numeral 52 denotes another shaft sealing member that seals the fluid with the rotation shaft 50. The first centrifugal impeller 42 and the second centrifugal impeller 43 are separate bodies, and the first centrifugal impeller 42 is driven by the output shaft 50 of the electric motor 41, and the second centrifugal impeller 43 is It is configured to be driven by the rotating shaft 51.
[0043]
  Next, the operation will be described. Since the basic idea is the same as in the second embodiment, only the characteristic operation will be described. First, in the cleaning process, in order for the cleaning pump to pressurize water, the electric motor 41 is rotated counterclockwise. In this rotational direction, the clutch mechanism 44 does not transmit the output torque of the electric motor 41 to the rotating shaft 51 of the second centrifugal impeller 43. As shown in FIG. 7, only the first centrifugal impeller 42 rotates counterclockwise and pressurizes water with the blade 42a. The water passes through the second centrifugal impeller 43 and is discharged from the discharge port. At this time, the second centrifugal impeller 43 is stationary at the start of operation, but rotates by the reaction force of the water flow as the water flows out. The clutch mechanism 44 does not restrain the rotation in this direction, and the second centrifugal impeller 43 is rotatable. That is, a predetermined pressurizing capability is obtained as the cleaning pump 40 by performing a diffuser function of recovering the dynamic pressure of the fluid to a static pressure while gently rotating the second centrifugal impeller 43.
[0044]
  Moreover, in order to pressurize air at a drying process, the electric motor 41 is rotated clockwise. In this rotational direction, the clutch mechanism 44 is configured to transmit the output torque of the electric motor 41 to the first centrifugal impeller 42 in addition to the second centrifugal impeller 43. As shown in FIG. 8, the first centrifugal impeller 42 and the second centrifugal impeller 43 rotate in the clockwise direction, and mainly pressurize the air with the blades 43a. Since the peripheral speed of the second centrifugal impeller 43 and the absolute velocity of the gas are larger than those of the first centrifugal impeller 42, the air is mainly pressurized by the second centrifugal impeller 43, The one centrifugal impeller 42 obtains a predetermined pressurizing capability for blowing air by performing an action as an inlet guide vane for smoothing inflow of air.
[0045]
  Further, in the cleaning process, when the cleaning water is insufficient and water containing bubbles is circulated, or when this pump is started from a state in which a large amount of air remains in the casing 24, the same as in the case of air. Next, the electric motor 20 is rotated clockwise. Then, air bubbles and air are accelerated by the blades 43a of the second centrifugal impeller 43, pushed to the inner wall of the casing 46, and the air is excluded from the rotation region of the blades 42a of the first centrifugal impeller 42, The first centrifugal impeller 42 has the ability to pressurize water. Thus, the ability to stably circulate water containing bubbles is the same as in the above embodiments.
[0046]
  In such a cleaning process, when the amount of bubbles of water circulating thereafter is small, the load torque applied to the electric motor 41 that drives the second centrifugal impeller 43 becomes excessive. In that case, the electric motor 41 is rotated counterclockwise. Then, since the water is pressurized only by the first centrifugal impeller 42, the load torque applied to the electric motor 41 can be reduced, and an operation like a normal washing process can be performed.
[0047]
  As described above, the output switching means is realized in accordance with the difference in the process, the state of the fluid, or the load of the first centrifugal impeller 42 and the second centrifugal impeller 43, that is, according to the load torque of the electric motor 41. As a method, a clutch mechanism 44 is provided to switch the rotation direction of the electric motor 41. Thereby, the washing pump 40 that can pressurize or circulate air, water, or water containing bubbles can be realized by the small electric motor 41 having a small output torque, and the size of the washing mechanism of the dishwasher can be reduced. Become.
[0048]
  In the first to fourth embodiments, the arm-shaped cleaning nozzle that rotates as the cleaning means is provided, but it goes without saying that the same can be applied to a fixed type or substantially disk-shaped one.
[0049]
【The invention's effect】
  Since this invention is comprised as mentioned above, it has an effect as described below.
[0050]
  According to invention of Claim 1, the washing tank which accommodates to-be-washed | cleaned object, the washing | cleaning means which has a jet nozzle which ejects washing water, and the washing pump which pressurizes washing waterAnd an electric motor for driving the washing pump,Wash pumpFixed to the output shaft of the motor,A first centrifugal impeller disposed substantially concentrically andSaidA second centrifugal impeller having a larger outer diameter than the first centrifugal impeller;The first centrifugal impeller and the second centrifugal impellerAnd the cleaning water suction and discharge portsProvidedWith casingThe outlet angle of the first centrifugal impeller is approximately 90 degrees or less, the outlet angle of the second centrifugal impeller is approximately 90 degrees or more, and the discharge port is a cleaning means from the casing. Since the casing side is formed so as to be higher than the cleaning means side.Pressurization water can be pressurized and circulated to the cleaning means even when the water level or water volume fluctuates, and a predetermined cleaning power can be obtained.At the same time, the position of the cleaning nozzle can be lowered, and a large cleaning space can be formed between the tableware basket and the cleaning tank.
[0051]
  Claim2According to the described invention, WashAt least the first centrifugal impeller or the second centrifugal impeller in the purification process and the drying processDriveOutput switching means for movingBecause we establishedIt is possible to realize the optimal pressurization capacity according to the object to be pressurized in each processBecome.
[0052]
  Claim3According to the described invention, the output switching means is at least the first centrifugal impeller or the second centrifugal impeller depending on the rotation direction of the electric motor.InA clutch mechanism that transmits the output torque of the motorAnd by the clutch mechanismSwitch the rotation direction of the motor between the washing process and the drying processBecause I didThe pressurization characteristics necessary for the washing pump are obtained, and the predetermined washing performance and drying performance are obtained.be able to.
[0053]
  Claim4According to the described invention, the casing of the cleaning pump is substantially circular, and at least the first centrifugal impeller or the second centrifugal impeller is disposed substantially concentrically, and the discharge port is provided in a substantially radial direction.BecauseSimple shapeAtMotivation rotation direction can be selected freely, PlaceGet constant cleaning and drying performance, compact and inexpensiveConfigurationRealizebe able to.
[Brief description of the drawings]
FIG. 1 is a view showing a form of a washing pump of a dishwasher in Embodiment 1 of the present invention.
FIG. 2 is a block diagram of the dishwasher of the embodiment.
FIG. 3 is a configuration diagram of a dishwasher in Embodiment 2 of the present invention.
FIG. 4 is a view showing a form of a cleaning pump of the same embodiment
FIG. 5 is a configuration diagram of a dishwasher in Embodiment 3 of the present invention.
FIG. 6 is a cross-sectional view of an essential part of a washing pump of a dishwasher in Embodiment 4 of the present invention.
FIG. 7 is a diagram showing an operating state in which water is pressurized in the same embodiment.
FIG. 8 is a diagram showing an operating state in which air is pressurized in the same embodiment.
FIG. 9 is a block diagram of a conventional dishwasher
FIG. 10 is a view showing a configuration of a washing pump of the conventional example
FIG. 11 is a view showing a form when the washing pump is rotated.
FIG. 12 is a cross-sectional view of a main part of another conventional dishwasher.
[Explanation of symbols]
  1 First centrifugal impeller
  2 Second centrifugal impeller
  3 Casing
  4 Suction port
  5 Discharge port
  6 Electric motor
  7 Centrifugal pump
  27 Circulation route
  44 Clutch mechanism
  50 output shaft
  51 Rotating shaft

Claims (4)

A cleaning tank for accommodating the object to be cleaned, comprising a cleaning means having an injection port for injecting the washing water, a washing pump for pressurizing flush water, and a motor for driving the washing pump, the wash pump, the electric motor is fixed to the output shaft, and a large second centrifugal impeller outer diameter than the first centrifugal impeller and the first centrifugal impeller is arranged substantially concentrically, the first centrifugal impeller and the A second centrifugal impeller and a casing provided with a suction port and a discharge port for washing water, the outlet angle of the blades of the first centrifugal impeller is approximately 90 degrees or less, and the second The outlet of the centrifugal impeller is set to approximately 90 degrees or more, the discharge port is provided so as to communicate with the cleaning means from the casing, and the casing side is formed above the cleaning means side . In the washing step and the drying step, at least a first centrifugal impeller or dishwashing machine according to claim 1, wherein providing the second output switching means for driving movement of the centrifugal impeller. Output switching means, the rotation direction of the motor, has a clutch mechanism for transmitting the output torque of at least the electric motor to the first centrifugal impeller or a second centrifugal impeller, the electric motor in the washing step and the drying step by the clutch mechanism The dishwasher according to claim 2 , wherein the direction of rotation is switched. The casing of the washing pump in the generally circular, with arranging at least a first centrifugal impeller or a second centrifugal impeller on a substantially concentric, the 請 Motomeko 1-3 provided the discharge opening in a substantially radial direction dishwasher according to any one.

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