JP2004278539A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump that simplifies its configuration and can contribute to an increase in the occupation space of a washing chamber in the machine body of a diskwasher. <P>SOLUTION: The pump P has a brushless motor M in a pump housing 22 including a motor case 25. The brushless motor M comprises a shaft S; a magnet rotor 26; and a stator 27 as a stator; and an impeller 28 as a rotor and an impeller blade. The shaft S cannot be rotated while it is erected and fixed to the motor case 25 even if the brushless motor M generates a rotation drive force. The stator 27 is subjected to waterproof treatment by coating each coil 34 and the shaft S with resin J. Then, the impeller 28 can be directly rotated with the axis of the shaft S as a center by a magnetic pole generated from each coil 34 of the stator 27. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump that is housed in a pump room of a dishwasher and is used both in a dishwashing mode and a washing liquid draining mode.

  2. Description of the Related Art Conventionally, a dishwasher provided with a dishwashing room and a pump room accommodating a dishwasher pump in a main body of the machine has been known. In this type of dishwasher, the pump is usually configured as two separate pumps, a cleaning pump and a drainage pump (hereinafter, referred to as a "first conventional technique"), and a cleaning pump. There is a type in which a pump and a drainage pump have a dual-purpose configuration (hereinafter, referred to as “second related art”).

  That is, in the first prior art, only the cleaning pump is driven in the tableware cleaning mode in a state where the drainage pump is stopped. Then, the washing water is circulated and supplied between the washing chamber and the pump chamber based on the driving of the pump, and the dishes are washed with the washing water jetted into the washing chamber via a nozzle or the like. In addition, when the washing of the tableware is completed and the drainage mode is set, only the drainage pump is driven with the washing pump stopped, and the used washing water flowing from the washing room into the pump room is drained. The pump is driven out of the main body by driving the pump.

  On the other hand, in the second prior art, as described in Patent Document 1, for example, a washing / draining pump is provided with a cleaning pump blade at an upper end of a motor shaft of a motor, and a drainage is provided at a lower end of the motor shaft. With pump blades for In addition, the motor has a configuration in which the rotation direction of the motor shaft is different between the dishwashing mode and the washing water draining mode. When the rotation direction of the motor shaft is the rotation direction (first direction) in the cleaning mode, only the pump blade for cleaning functions, while the rotation direction in the drain mode (second direction). In some cases, both pump blades are configured so that the way the blades are attached to the motor shaft is different so that only the drainage pump blades function.

Therefore, in the second prior art, in the dishwashing mode, the motor shaft is driven to rotate in the first direction, and the washing water sucked from the washing chamber into the pump chamber is washed by the function of the washing pump blade. It is circulated and supplied between the chamber and the pump chamber, and is ejected into the cleaning chamber via a nozzle. Further, when the washing of the dishes is completed and the drain mode is set, the motor shaft is driven to rotate in the second direction, and the used washing water flowing into the pump chamber from the washing chamber is discharged from the pump blade for drain. It is designed to be discharged to the outside of the machine by the function.
JP-A-2002-51963

  By the way, in order to be able to wash many dishes in the dishwasher, it is necessary to increase the space occupied by the washing room in the main body of the dishwasher. However, in the first prior art, the cleaning pump and the drainage pump are separate bodies, and a space for disposing the cleaning pump and a space for disposing the drainage pump are provided in the pump room. And each is required. Therefore, the proportion of the space occupied by the pump room in the main body of the dishwasher increases, and there is a problem that the space occupied by the cleaning room in the main body of the dishwasher cannot be increased.

  Further, in the second prior art, the pump blades for cleaning and drainage have to be provided at the upper and lower ends of the motor shaft of the motor so that the blades are attached in different ways. Therefore, the pump has a complicated configuration. Further, in the second prior art, although one pump is used, the pump blades for cleaning and drainage (two pump blades) are provided at the upper and lower ends of the motor shaft. The pump itself had become larger in the vertical direction. Therefore, the proportion of the space occupied by the pump room in the main body of the dishwasher is increased, and it is difficult to increase the space occupied by the cleaning room in the main body of the dishwasher.

  The present invention has been made in view of the problems existing in such conventional techniques, and has as its object to simplify the pump configuration and reduce the space occupied by the washing room in the main body of the dishwasher. It is to provide a pump that can contribute to the increase.

  In order to achieve the above object, the invention according to claim 1 is accommodated in the pump room of a dishwasher having a dishwashing room and a pump room in a machine main body, in a dishwashing mode and for washing. A pump that also serves as a liquid drainage mode, and a motor that generates a rotational driving force in a fixed direction in a pump housing, and is rotatable around a predetermined axis based on the rotational driving force generated by the motor. A pump, comprising: a rotor provided with a permanent magnet, the rotor being rotatably provided with a permanent magnet; and And a stator provided with a coil for generating a magnetic pole for rotating the rotor. The rotor is integrally formed with a blade, and a blade is integrated with the rotor. It was the gist of which has a configuration was.

  According to a second aspect of the present invention, in the pump according to the first aspect, the brushless motor is formed such that an outer shape of a cross section taken along a plane including the axis is substantially flat. Was the gist.

  According to a third aspect of the present invention, in the pump according to the first or second aspect, the brushless motor has a configuration in which the stator is configured such that the coil is directly mounted on a thin plate-shaped substrate. The gist was that

  ADVANTAGE OF THE INVENTION According to this invention, a pump structure can be simplified and it can contribute to increasing the space occupied by the washing room in the main body of a dishwasher.

An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, a dishwasher 11 according to the present embodiment includes, in a machine body 12, a washing room 13 for washing dishes D and a pump room 14 located below the washing room 13. The washing chamber 13 and the pump chamber 14 are formed by partitioning an internal space NS in the machine main body 12 up and down by a partition plate 15. In the description in this specification, “up, down, left, and right directions” indicate the up, down, left, and right directions in FIG.

  The washing room 13 accommodates a tableware basket 16 on which tableware D is arranged, and the tableware basket 16 is slidably mounted on a rail 17 extending in the horizontal direction (the left-right direction in FIG. 1). Further, a nozzle 18 for ejecting cleaning water as a cleaning liquid is provided at a lower portion of the cleaning chamber 13, and a plurality of holes (not shown) are formed on an upper surface of the nozzle 18. A nozzle pipe 18 a is provided on the lower surface of the nozzle 18 so as to extend through the partition plate 15 and into the pump chamber 14. In the nozzle pipe 18a, an internal space forming a flow path to the washing chamber side is connected to each hole provided on the upper surface of the nozzle 18, and in the washing mode of the tableware D, the pump chamber is connected via the nozzle pipe 18a. The cleaning water supplied from the side 14 is jetted into the cleaning chamber 13 from each hole on the upper surface of the nozzle 18.

  Further, on the left side of the cleaning room 13, an opening / closing door 19 which constitutes a part of a side wall of the machine main body 12 and is formed to be capable of opening and closing with respect to the machine main body 12 is provided. The opening / closing door 19 is opened when the tableware D is placed in the tableware basket 16 of the cleaning room 13 or when the tableware D after washing is taken out of the cleaning room 13 or the like, and is closed at other times. . On the right side of the cleaning chamber 13, an injection passage 20 for injecting the cleaning water into the cleaning chamber 13 from outside the machine main body 12 is formed. In addition, a suction port 21 for sucking cleaning water from the cleaning chamber 13 into the pump chamber 14 is provided at the bottom of the cleaning chamber 13. A filter F for removing leftovers and the like attached to the tableware D is provided in the suction port 21 so that the leftovers and the like attached to the tableware D are not sucked into the pump chamber 14 together with the washing water.

  On the other hand, the pump chamber 14 serves as a pump that circulates and supplies the cleaning water between the cleaning chamber 13 and the pump chamber 14 in the cleaning mode, and discharges the cleaning water from the pump chamber 14 to the outside of the machine body 12 in the drain mode. A washing / draining pump (hereinafter, referred to as “pump”) P and a switching valve V as switching means for switching a flow path are accommodated therein. In this embodiment, the pump P and the switching valve V constitute a dishwasher pump device. Hereinafter, the dishwasher pump device will be described with reference to FIGS.

  As shown in FIG. 1, the pump P is connected to an input port of a switching valve V via an outlet pipe 23 provided on a side wall of the pump housing 22. The switching valve V is a conventionally known one-input, two-output valve, and a control device (not shown) switches and controls the communication between the input port and the two output ports. In the switching valve V, the nozzle pipe 18a is connected to one of the two output ports, and the other output port has a base end of a drain pipe 24 whose tip extends outside the machine body 12. Is connected. Accordingly, when the input port of the switching valve V is switched to a state in which the input port communicates with the one output port, the cleaning water derived from the pump P is supplied to the nozzle pipe 18a, and the cleaning chamber is supplied from each hole on the nozzle 18 upper surface. 13 is ejected. On the other hand, when the input port of the switching valve V is switched to a state in which the input port communicates with the other output port, the washing water derived from the pump P is supplied to the drain pipe 24, and the cleaning water flows through the flow path in the drain pipe 24. It is discharged to the outside of the machine body 12 through the main body.

Here, a specific configuration of the pump P will be described.
As shown in FIG. 2, the pump P is constituted by a motor case 25 in which a lower portion of the pump housing 22 has a substantially bottomed cylindrical shape. In the pump housing 22 including the motor case 25, It has a brushless motor M as a motor. As shown in FIGS. 2 and 3, the brushless motor M includes a shaft S, a magnet rotor 26 as a rotor, a stator 27 as a stator, and an impeller 28 as a rotor and a blade member. As is clear from FIG. 2, the brushless motor M is formed such that the outer shape (vertical cross section in FIG. 2) of a cross section cut along a plane including the axis of the shaft S is substantially flat. I have. In the pump chamber 14, the brushless motor M is arranged such that the cleaning chamber 13 is located above the shaft S in the axial direction, and the switching valve V is in a direction substantially perpendicular to the axial direction of the shaft S (FIG. 2). In the case of, the right side) is connected.

  As shown in FIGS. 2 and 3, a step portion 25a is formed on the inner peripheral surface of the motor case 25 along the circumferential direction, and a substantially circular shape is formed at a substantially center of a bottom portion surrounded by the step portion 25a. A through hole 25b is formed. In addition, a pair of screw holes 25c are formed at two positions facing each other across the through hole 25b on the upper surface of the step portion 25a.

  Further, the shaft S is a substantially round bar-shaped member having a predetermined length, and a plurality of annular grooves Sa to Se are formed at predetermined positions in an axial direction on an outer peripheral surface thereof. The lower end of the shaft S is inserted into the through hole 25 b via a fixing bracket 29, and is fixed in a state of being set up substantially perpendicular to the bottom surface of the motor case 25. Therefore, in this embodiment, even when the brushless motor M generates a rotational driving force, the shaft S cannot be rotated in a state where the shaft S is erected and fixed to the motor case 25.

  As shown in FIG. 2, the magnet rotor 26 is disposed in a housing space surrounded by a step 25a in the motor case 25. The magnet rotor 26 has a substantially disk shape, and a through hole 26a having an inner diameter slightly larger than the outer diameter of the shaft S is formed substantially in the center thereof. As shown in FIG. 2, the diameter of the through-hole 26a is larger at an inner peripheral surface portion connected to the lower side of the opening than at an opening opening at the upper surface side of the magnet rotor 26. An accommodation portion 26b for accommodating the bearing 30 is constituted by the inner peripheral surface portion having a diameter. The bearing 30 is fixed to the magnet rotor 26 in a state housed in the housing portion 26b.

  The magnet rotor 26 has a thick portion 26c in which a substantially outer half in the radial direction of the magnet rotor 26 is formed thick. A plurality (six in the present embodiment) of permanent magnets MgR are provided at equal intervals along the circumferential direction of the magnet rotor 26 inside the thick portion 26c. Each permanent magnet MgR is arranged inside the thick portion 26c so that the magnetic poles are alternately different. That is, permanent magnets MgR whose magnetic poles are S poles and permanent magnets MgR whose magnetic poles are N poles are alternately arranged.

  The magnet rotor 26 is provided rotatably about the axis of the shaft S via a bearing 30 in a state where the shaft S is inserted into the through hole 26a. The bearing 30 is configured such that the axial movement of the shaft S is prevented by fitting the retaining rings 31 and 32 into the annular grooves Se and Sd of the shaft S. Accordingly, since the bearing 30 is prevented from moving in the axial direction of the shaft S, the magnet rotor 26 is also prevented from moving in the axial direction of the shaft S.

  The stator 27 includes a substantially disk-shaped substrate 33 and a plurality of (six in the present embodiment) coils 34 mounted on the substrate 33. The substrate 33 is disposed above the magnet rotor 26 and above the upper surface of the step 25a of the motor case 25, and a through hole having an inner diameter substantially equal to the outer diameter of the shaft S is provided substantially in the center thereof. 33a are formed. Further, a pair of through holes 33b is formed in the substrate 33 at two positions on a peripheral portion facing each other across the through hole 33a.

  Each of the coils 34 is formed of a winding wound in a circular shape, and is disposed along the circumferential direction of the substrate 33 such that the center of each of the coils 34 is substantially at the center of the substrate 33 in the radial direction. It has a configuration. That is, as shown in FIG. 2, in the axial direction of the shaft S, the position where each coil 34 of the stator 27 is arranged corresponds to the position where each permanent magnet MgR of the magnet rotor 26 is arranged. When a current is supplied to each coil 34, a magnetic pole for rotating the magnet rotor 26 and the impeller 28 is generated. When the direction of the current supplied to each coil 34 is switched by a control device (not shown), the magnetic pole generated in each coil 34 is switched. Electronic components (such as an IC chip) constituting a drive circuit of the brushless motor M are mounted on the substrate 33 (not shown).

  As shown in FIG. 2, the stator 27 is disposed at a position where the annular groove Sc is provided in the axial direction of the shaft S in a state where the shaft S is inserted into the through hole 33a. The stator 27 is screwed into the holes 33b and 25c in a state where the through holes 33b and the screw holes 25c communicate with each other. Is fixed. In the fixed state, the stator 27 has the substrate 33, the coils 34, and the shaft S (specifically, the peripheral surface near the annular groove Sc) coated with the resin J. As described above, the stator 27 is waterproofed by coating the substrate 33, the coils 34, and the shaft S with the resin J.

  The impeller 28 has a substantially disk shape, is formed so that its diameter (outer diameter) is substantially equal to the diameter of the magnet rotor 26, and has an inner diameter substantially equal to the outer diameter of the shaft S in the substantially center thereof. Is formed. Further, on the upper surface of the impeller 28, a plurality of (in the present embodiment, six) blade portions 28b curved in an arc shape are provided at equal intervals in the circumferential direction of the impeller 28. The impeller 28 is provided with a plurality (six in the present embodiment) of permanent magnets MgI at equal intervals in the circumferential direction of the impeller 28 in the vicinity of the periphery thereof (see FIG. 2). These permanent magnets MgI are arranged such that the magnetic poles are alternately different, that is, the permanent magnets MgI whose magnetic poles are S poles and the permanent magnets MgI whose magnetic poles are N poles are alternately arranged.

  The impeller 28 is provided rotatably about the axis of the shaft S in a state where the shaft S is inserted into the through hole 28a. The impeller 28 is configured such that the axial movement of the shaft S is prevented by fitting the retaining rings 36 and 37 into the annular grooves Sb and Sa of the shaft S. Further, thrust washers 38 and 39 are interposed between both opening portions of the through hole 28 a of the impeller 28 and each of the retaining rings 36 and 37. Then, as shown in FIG. 2, in the axial direction of the shaft S, a position where each permanent magnet MgI of the impeller 28 is disposed, a position where each coil 34 of the stator 27 is disposed, and each permanent magnet MgR of the magnet rotor 26. Are arranged so as to correspond to each other.

  As described above, the brushless motor M is configured such that the direction of the current supplied to each coil 34 of the stator 27 is switched by the control device (not shown) so that the magnetic poles of each coil 34 are switched, and the magnet rotor 26 and the impeller 28 It is designed to rotate clockwise (only in a certain direction) about S. Therefore, in the brushless motor M, the rotation of the shaft S does not transmit the rotational driving force from the shaft S, but the impeller 28 directly moves the axis of the shaft S by the magnetic pole generated from each coil 34 of the stator 27. It is designed to rotate around the center. In this case, the impeller 28 as a blade member also functions as a rotor, and is configured to also serve as the rotor of the brushless motor M.

  Further, in the dishwasher 11 of the present embodiment configured as described above, by controlling the rotation speed of the brushless motor M, the washing mode in the washing mode can be changed according to the degree of contamination of the dish D. It has become. An example will be described below.

  The cleaning forms include a standard course, a meticulous course, and a rapid course. Each course includes a washing step, a rinsing step, and a hot water rinsing step, and the tableware D is washed in the order of the washing step, the rinsing step, and the hot water rinsing step. Note that washing of the tableware D includes rinsing of the tableware D. Then, in each step, the tableware D is washed for a predetermined time set in advance, and thereafter, when the mode is changed to the drain mode, the washing water is drained. At this time, the control device controls the drive time and rotation speed of the brushless motor M, the switching of the flow path of the switching valve V, and the timing thereof.

  Next, the operation of the dishwasher 11 according to the present embodiment configured as described above will be described. In the following description, the washing water is injected into the washing chamber 13 through the injection passage 20 with the dish D arranged in the dish basket 16 of the washing chamber 13, and the washing mode of the dishwasher 11 is carefully considered. The mode in which the dishwasher 11 performs washing and drainage will be described by taking a washing process when a course is selected as an example.

  First, the control device switches the communication state between the input port and the two output ports in the switching valve V to a state in which the output port connected to the cleaning chamber 13 and the input port communicate with each other. Is supplied to the nozzle pipe 18a. Next, the control device starts supplying current to each coil 34 provided on the stator 27 of the brushless motor M, and the direction of the current is switched, so that the impeller 28 is rotated. At this time, the number of rotations of the brushless motor M is, for example, 4000 to 5000 rotations per minute.

  Then, the washing water sucked into the pump chamber 14 through the suction port 21 of the washing chamber 13 is drawn out from the pump P to the outlet pipe 23 by the rotation of the impeller 28, and is discharged through the switching valve V and the nozzle pipe 18 a. 18. At this time, the shaft S that penetrates the stator 27 in the vertical direction is fixed upright with the penetrating portion coated with the stator 27 together with the resin J, and the shaft S and the stator 27 rotate. There is no. Therefore, the washing water does not flow along the outer peripheral surface of the shaft S into the motor case 25 below the stator 27.

  Then, the washing water supplied to the nozzle 18 is jetted out of the holes on the upper surface of the nozzle 18 into the washing chamber 13, and the dish D is washed with the jetted washing water. Thereafter, the cleaning water jetted into the cleaning chamber 13 is again sucked into the pump chamber 14 from the cleaning chamber 13 and supplied to the nozzle 18 by the rotation of the impeller 28 in the same manner as described above. The tableware D is spouted into the chamber 13 to wash the tableware D. Thereafter, the tableware D is washed by repeating such circulating supply of the washing water.

  Thereafter, when a predetermined time (for example, 20 minutes) elapses, the control device stops supplying the current to the brushless motor M, and ends the cleaning of the tableware D. Then, the washing mode is changed to the drain mode, and the control device changes the communication state between the input port in the switching valve V and the two output ports to a state in which the output port connected to the drain pipe 24 and the input port communicate. And the supply destination of the washing water led out from the outlet pipe 23 is set to the drain pipe 24. Next, the supply of the current to each coil 34 of the brushless motor M is restarted by the control device, and the direction of the current is switched, whereby the impeller 28 is rotated in the same constant direction as in the cleaning mode.

  Then, the washing water sucked into the pump chamber 14 from the washing chamber 13 is drawn out of the pump P to the outlet pipe 23 by the rotation of the impeller 28, and discharged out of the machine body 12 through the switching valve V and the drain pipe 24. You. Thereafter, when a predetermined time (for example, one minute) elapses, the supply of the current to the brushless motor M is stopped by the control device, and the discharge of the washing water ends.

Therefore, according to this embodiment, the following features can be obtained.
(1) In the present embodiment, the brushless motor M as a motor in the pump P is configured to generate a rotational driving force in a fixed direction in both the cleaning mode and the drainage mode. Thus, the pump configuration can be simplified as compared with the prior art in which the rotation direction is switched and controlled. On the downstream side of the pump P, the supply destination of the washing water derived from the pump P based on the rotation of the impeller 28 as a blade member is switched to a flow path connected to the cleaning chamber 13 or a flow path connected to the outside of the machine body 12. A switching valve V was connected as switching means. Accordingly, the space ratio of the pump room 14 in the machine body 12 of the dishwasher 11 is reduced without complicating the structure of the pump P functioning as the washing / draining pump, and the space occupied by the washing room 13 is correspondingly reduced. Can be increased.

  (2) Further, a brushless motor M having an impeller 28 as a rotor and a stator 27 as a stator is used as the motor of the pump P. Therefore, the brushless motor M generally has a feature that the motor main body can be downsized, so that the space ratio of the pump chamber 14 in the internal space NS of the dishwasher 11 can be further reduced, and the space occupied by the cleaning chamber 13 can be increased. Can contribute. Further, the brushless motor M has a feature that its shape can be freely changed as compared with other motors (for example, a DC motor or the like), so that it is suitable for disposing the pump P in a limited space of the pump chamber 14. .

  (3) Further, the brushless motor M is formed such that the outer shape of a cross section taken along a plane including the axis of the shaft S has a substantially flat shape as is clear from FIG. Is installed in the pump P, it is possible to suppress the pump P from increasing in size in the axial direction of the shaft S. Therefore, also in this respect, since the space ratio of the pump chamber 14 can be reduced, the space occupied by the cleaning chamber 13 can be further increased.

  (4) Since the impeller 28 as a rotor in the brushless motor M is also used as a blade member integrally formed with the blade portion 28b on the upper surface, the configuration of the pump P can be further simplified.

  (5) The magnetic poles generated from the coils 34 of the stator 27 of the brushless motor M cause the impeller 28 to rotate directly about the axis of the shaft S fixed upright to the motor case 25. Therefore, the motor configuration of the pump P can be simplified as compared with the conventional configuration in which the impeller 28 is rotated via the shaft S that rotates by itself. Further, the transmission efficiency of the rotational driving force in the pump P can be improved.

  (6) Further, the stator 27 of the brushless motor M is composed of a substantially disk-shaped substrate 33 and a plurality of coils 34 directly mounted on the substrate 33. Therefore, it is possible to suppress an increase in the thickness of the motor M itself in the axial direction of the shaft S as compared with a configuration in which a coil is wound around an iron core, for example. As a result, an increase in the size of the pump P in which the motor M is mounted in the axial direction of the shaft S can be reliably suppressed.

  (7) In the pump chamber 14, the brushless motor M is disposed so that the cleaning chamber 13 is located above the shaft S in the axial direction, and the switching valve V is set substantially perpendicular to the axial direction of the shaft S. They are connected so as to be arranged in the horizontal direction. Therefore, the pump P and the switching valve V can be efficiently arranged in the limited space of the pump chamber 14, and also in this respect, the space ratio of the pump chamber 14 is reduced and the space occupied by the cleaning chamber 13 is increased. it can.

  (8) Further, even when the brushless motor M generates a rotational driving force, the shaft S penetrating the stator 27 in the up-down direction is erected and fixed with the penetrating portion coated with the resin J together with the stator 27. The shaft S and the stator 27 do not rotate. Therefore, the washing water does not flow along the outer peripheral surface of the shaft S into the motor case 25 (the lower portion of the pump housing 22) below the stator 27.

  (9) The stator 27 is coated with a resin J to coat the substrate 33, the coils 34, and the shaft S, which constitute the stator 27, so that the stator 27 is waterproofed. The impeller 28 was rotated around the center. Therefore, the waterproof property of the stator 27 as the stator can be secured by the resin coating.

The above embodiment may be embodied by being changed to another embodiment (another example) as described below.
In the above-described embodiment, the dishwasher 11 includes the washing room 13 and the pump room 14 in the machine main body 12, but may further include another room such as a drying room in the machine main body 12.

  In the above-described embodiment, the brushless motor M is disposed in the pump chamber 14 located below the cleaning chamber 13 so that the axial direction of the shaft S is in the vertical direction (vertical direction). The arrangement of M may be changed as appropriate. For example, the shaft S may be arranged so that the axial direction thereof is the left-right direction (horizontal direction).

  In the above-described embodiment, the switching valve V is configured as a one-input, two-output valve. However, as a supply destination of the cleaning water derived from the pump P, the flow path connected to the cleaning chamber 13 and the outside of the machine main body 12 are provided. The valve configuration is not limited to the valve configuration of the above-described embodiment as long as it is a valve form that can switch the flow path to each flow path including the flow path connected to.

  In the above-described embodiment, the brushless motor M includes the magnet rotor 26. However, the magnet rotor 26 may be omitted as long as the brushless motor M includes the impeller 28 that is a rotor that also serves as a blade member.

  In the above-described embodiment, the outer shape of the cross section of the brushless motor M cut by a plane including the axial direction of the shaft S is configured to be substantially flat. However, the shape is not necessarily required to be substantially flat. For example, it may have a substantially rectangular shape in which the length of a side along the axial direction of the shaft S is long.

  The configuration of the brushless motor M in the above embodiment may be appropriately changed, for example, as follows. Specifically, an inner rotor type brushless motor M in which a magnet is housed inside as a rotor (rotor), and a coil (winding) is housed inside as a stator (stator), and may be arranged outside. Further, an outer rotor type in which a coil is arranged inside and a magnet is arranged outside and the outside is rotated may be used.

Next, technical ideas that can be grasped from the above embodiment and other examples will be additionally described below.
(B) In the brushless motor, a shaft is vertically penetrated through the stator, and the shaft is fixed upright with a penetrating portion coated with a resin together with the stator. The pump according to any one of claims 1 to 3, wherein the blade member is rotatably provided about an axis.

  (B) a pump which is housed in the pump room of a dishwasher having a dishwashing room and a pump room in the machine body, and is also used in a dishwashing mode and a washing liquid draining mode, In the housing, there is provided a motor for generating a rotational driving force in a certain direction, and a blade member rotatable around a predetermined axis based on the rotational driving force generated by the motor, wherein the blade member rotates. Wherein the motor is provided with a rotor rotatably provided with a permanent magnet, and a coil for generating a magnetic pole for rotating the rotor. A brushless motor having a stator, wherein the stator penetrates a substrate that constitutes the stator, the coil, and a shaft that vertically passes through the stator. Pump that has been subjected to waterproofing treatment by being both resin coating.

FIG. 2 is a partially cut-away longitudinal sectional view of the dishwasher according to the embodiment when viewed from the side. Similarly, the longitudinal cross-sectional view when the brushless motor is viewed from the side. Similarly, the perspective view which shows the state which disassembled the brushless motor.

Explanation of reference numerals

  M: brushless motor as motor, P: washing / draining pump as pump, D: tableware, MgI: permanent magnet, MgR: permanent magnet, 11: dishwasher, 12: machine body, 13: washing room, 14: pump Chamber, 22: Pump housing, 26: Magnet rotor as rotor, 27: Stator as stator, 28: Blade member and impeller as rotor, 28b: Blade part, 33: Substrate, 34: Coil.

Claims (3)

A pump that is housed in the pump chamber of the dishwasher having a dishwashing chamber and a pump chamber in the main body of the dishwasher, and is also used in the dishwashing mode and the drainage mode of the washing liquid. A motor for generating a rotational driving force in a certain direction, and a blade member rotatable around a predetermined axis based on the rotational driving force generated by the motor, for cleaning by rotating the blade member. In a pump that leads a liquid out of the pump housing,
The motor is configured as a brushless motor including a rotor provided with a permanent magnet and rotatably provided, and a stator provided with a coil generating a magnetic pole for rotating the rotor. A pump in which a blade portion is integrally formed with the child and the blade member is integrated. 2. The pump according to claim 1, wherein the brushless motor is formed such that an outer shape of a cross section cut by a plane including the axis is substantially flat. 3. 3. The pump according to claim 1, wherein the brushless motor has a configuration in which the coil is directly mounted on a substrate in which the stator has a thin plate shape. 4.

Images