JP2005146970A - Pump, connection pump and dish washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress drop of delivery performance of a pump due to air suction. <P>SOLUTION: An impeller 15 having been provided in a pump chamber 33 rotatably in a regular and a reverse direction and having different fluid pumping action depends on rotation direction is provided. When a rotation direction having large fluid pumping action in the rotation directions of the impeller 15 is defined as a first rotation direction (direction of an arrow head b) and a rotation direction having small fluid pumping action is defined as a second rotation direction (direction of arrow head "a"), fluid is sucked from a suction flow passage 35a into a pump chamber 33 by rotating the impeller 15 in the first rotation direction and sucked fluid is discharged out of the pump chamber 33 from a delivery flow passage 37a. The suction flow passage 35a is connected to the pump chamber 33 at a direction crossing with a rotary axis 14a of the impeller 15. Consequently, when the impeller 15 is driven and rotated in the direction in which the pump 17 does not function (direction of arrow head "a"), fluid can not easily flow in the suction flow passage 35a and suction of air from the delivery flow passage 37a can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump, a connection pump including the pump, and a dishwasher including the connection pump.

  Conventionally, for example, as a pump mounted on a dishwasher, a washing pump and a drainage pump are arranged in the vertical direction, and the washing pump and the drainage pump are coupled to a rotating shaft of one motor (motor unit). (For example, refer to Patent Document 1). According to this connection pump, the washing pump functions by rotating the motor unit in one direction (forward direction), the washing water in the washing water tank is sucked and the washing water is discharged toward the tableware, Tableware is washed. In addition, the drain pump functions by rotating the motor unit in the other direction (reverse direction) after the cleaning operation is completed, and the cleaning water in the cleaning water tank is sucked and the cleaning water is drained outside the dishwasher. .

  A drainage pump used in such a connection pump is shown in FIG. An impeller 104 connected to a rotating shaft 103 is provided in the pump chamber 102 of the drainage pump 101. The suction port 105 of the pump chamber 102 is provided with a suction pipe 107 that forms a suction flow path 106, and the discharge port 108 of the pump chamber 102 is provided with a discharge pipe 110 that forms a discharge flow path 109. This discharge pipe is connected to a drainage drain pipe (not shown).

  The suction pipe 107 has a longitudinal direction parallel to the tangential direction of the outer periphery of the pump chamber 102, and the reverse rotation direction of the cleaning water in the pump chamber 102 when the impeller 104 rotates in the reverse direction (the direction of arrow b in the figure). It is provided at a position on the upstream side of the flow in the tangential direction of the flow to (in the direction of arrow c in the figure). As a result, the suction flow path 106 is connected to the upstream side of the flow in the tangential direction of the flow of the cleaning water in the pump chamber 102 in the reverse rotation direction. The discharge pipe 110 has a longitudinal direction parallel to the tangential direction of the outer periphery of the pump chamber 102 and flows in the reverse rotation direction of the cleaning water in the pump chamber 102 when the impeller 104 rotates in the reverse direction (arrow c in the figure). In the tangential direction of the flow direction). The discharge pipe 110 communicates with the atmosphere. Thereby, the discharge flow path 109 is connected to the downstream side of the flow in the tangential direction of the flow of the cleaning water in the pump chamber 102 in the reverse rotation direction.

  A working surface 104 b is formed on the blade 104 a of the impeller 104. An inclined surface 104c is formed on the back surface of the working surface 15b.

  In this structure, when the impeller 104 rotates in the reverse direction (in the direction of arrow b in the figure) during drainage, the fluid is pushed out by the working surface 104b facing the rotation direction of the blades 104a of the impeller 104, and the fluid flows from the suction channel 106. Is smoothly sucked into the pump chamber 102, fluid is smoothly discharged from the discharge passage 109 and drained to the outside. On the other hand, when the impeller 104 rotates forward (in the direction of arrow a in the figure) during cleaning, the inclined surface 104c is directed in the rotational direction. The pumping action is disabled.

JP-A-9-131292

  However, when the drainage pump 101 is rotationally driven in the forward rotation direction (arrow a in the figure) during cleaning and the impeller 104 rotates forward, the surface direction of the inclined surface 104c is not the same as the rotation direction of the fluid. The fluid is pushed out by an amount corresponding to the inclination, and the fluid is sucked into the pump chamber 102 from the discharge passage 109 to some extent and pushed out to the suction passage 106. At this time, the structure in which the flow of reverse-rotation washing water during drainage of the drainage pump 101 is smooth, that is, the flow of washing water during washing during forward rotation is also improved, so that the drainage is performed for a predetermined time or more. When the pump 101 is operated, the cleaning water stored in the discharge flow path 109 and the drainage drain pipe is gradually sucked into the pump chamber 102, and then the pump is used when there is no cleaning water in the discharge flow path 109 and the drainage drain pipe. External air will be sucked into the chamber 102. As a result, when the cleaning is completed, air accumulates in the pump chamber 102. When the drainage pump 101 is rotated backward from this state and drainage is performed, the impeller 104 is discharged due to the air accumulated in the pump chamber 102. The driving force is not sufficiently transmitted to the washing water, and the discharge performance is reduced.

  An object of the present invention is to suppress a decrease in discharge performance of a pump due to air suction.

  In the present invention, the suction flow path is connected to the pump chamber in a direction crossing the rotation axis of the impeller.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the discharge performance of the pump by the suction of air can be suppressed.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal side view showing the entire configuration of a dishwasher equipped with the pump of the present invention, FIG. 2 is a longitudinal side view showing a part thereof enlarged, and FIG. 3 is a sectional view taken along line AA in FIG. is there.

  As shown in FIG. 1, the dishwasher 1 is disposed below the tableware storage unit 4 in which the tableware 3 placed in the tableware basket 2 is stored, and is disposed below the tableware storage unit 4 to discharge cleaning water as a fluid. A nozzle body 6 provided with a plurality of nozzles 5, a storage tank 7 disposed below the nozzle body 6 and storing cleaning water, a function of discharging the cleaning water in the storage tank 7 from the nozzle 5, and cleaning of the storage tank 7 A vertical connection pump 9 having a function of discharging water out of the dishwasher 1 is provided. The dishwasher 1 is connected to a water pipe (not shown) for supplying cleaning water. In addition, a door 10 that can be freely opened and closed is provided in front of the tableware washing machine 1, and the tableware 3 can be taken in and out of the tableware storage unit 4 by opening the door 10.

  The coupling pump 9 is a motor-integrated pump, and as shown in FIG. 2, a housing 12 in which a cylindrical stator 11 is accommodated, and a rotor that is accommodated in the stator 11 so as to be rotatable forward and backward around an axis. 13. An impeller 15 that is fixed to the rotating shaft 14 of the rotor 13 and rotates forward and backward together with the rotor 13 is provided. The rotating shaft 14 extends in the vertical direction and is mounted in a direction in which the impeller 15 is positioned on the lower side. The upper side of the connection pump 9 is a washing pump 16 that is a pump, and the lower side is a drainage pump 17 that is a pump. The drainage pump 17 is a centrifugal pump. Thus, the connection pump 9 includes two pumps 16 and 17. Here, the rotating shaft 14 is pivotally supported by bearings 40 and 41 provided in the housing 12.

  A spiral recess 18 that functions as an impeller is formed on the outer periphery of the rotor 13. The recess 18 forms a spiral flow path 18 a from one end side of the rotor 13 toward the other end side. A centrifugal impeller 13 a is integrally formed at the upper end portion of the rotor 13. Inside the rotor 13, a plurality of permanent magnets (not shown) are provided, the tip portions of which are arranged to face the inner peripheral surface of the stator 11.

  The stator 11 has a cylindrical stator core 19 formed by laminating plate-shaped silicon steel plates, six convex portions 20 integrally formed radially at equal intervals on the inner peripheral side of the stator core 19, and wound around each convex portion 20. And a bobbin 22 that insulates between the protruding portion 20 and the winding 21.

  A cylindrical can 23 made of a nonmagnetic material such as aluminum or SUS and having a thin wall is attached to the inner peripheral side of the stator 11. The can 23 has a waterproof function with respect to the stator 11, and an O-ring 24 is interposed between the upper end portion of the can 23 and the housing 12, and between the lower end portion of the can 23 and the housing 12. An O-ring 25 is interposed. A space inside the can is a pump chamber 27a.

  An upper case 26 covering the upper side of the centrifugal impeller 13a is fixed to an upper end portion of the housing 12, and a space in the upper case 26 is a pump chamber 27b.

  At the lower end of the housing 12, the rotor 13 is rotated in the positive rotation direction that is the second rotation direction (rotated clockwise as viewed from above, in the direction of arrow a in FIG. 3, hereinafter referred to as positive rotation). A first suction port 28 is sometimes provided for sucking cleaning water (fluid) into the can 23. The first suction port 28 and the storage tank 7 are connected by a connection pipe 29. In the pump chamber 27b provided at the upper end of the housing 12, the cleaning water sucked from the first suction port 28 rises along the flow path 18a and enters the pump chamber 27b. Is provided with a first discharge port 30 through which the gas is discharged from the pump chamber 27b. The first discharge port 30 and the nozzle body 6 are connected by a connecting pipe 31 (see FIG. 1).

  A lower case 32 that covers the lower portion of the impeller 15 is fixed to the lower end portion of the housing 12, and a space in the lower case 32 is a pump chamber 33. The outer periphery of the pump chamber 33 is formed in a circular shape.

  The impeller 15 accommodated in the pump chamber 33 is a centrifugal impeller, and is provided with six blades 15a as shown in FIG. An action surface 15b is formed in the vertical direction on the blade 15a. When the impeller 15 rotates in the reverse rotation direction which is the first rotation direction (rotates counterclockwise when viewed from above, the direction of the arrow b in FIG. 3, hereinafter referred to as reverse rotation). It is formed so as to collide with the cleaning water in the pump chamber 33 at a substantially right angle and push the cleaning water in the reverse rotation direction. The inclined surface 15c, which is the back surface of the working surface 15b, is also formed in the vertical direction, and is formed so as to approach the working surface 15b toward the outside of the working surface 15b. In other words, the impeller 15 is inclined with respect to the direction in which the cleaning water is pushed out by the forward rotation. Thereby, when the impeller 15 rotates forward, the force by which the inclined surface 15c pushes the cleaning water is smaller than the force by which the action surface 15b pushes the cleaning water when the impeller 15 rotates reversely. When the impeller 15 rotates forward, the cleaning water pushed by the inclined surface 15c flows in the pump chamber 33 in the forward rotation direction.

  The pump chamber 33 is provided with a second suction port 34 that sucks cleaning water (fluid) into the pump chamber 33 when the rotary shaft 14 rotates in the reverse direction. A suction pipe 35 extends from the second suction port 34 toward the outside of the pump chamber 33. The suction pipe 35 is formed in a linearly extending shape, and the longitudinal direction of the suction pipe 35 is provided in a direction perpendicular to the rotation shaft 14. As a result, the suction flow path 35a formed inside the suction pipe 35 is connected to the pump chamber 33 orthogonally to the rotation axis 14a of the impeller (= the rotation axis 14a of the rotation shaft 14). The suction pipe 35 and the storage tank 7 are connected by a connection pipe 35b.

  Further, the pump chamber 33 is provided with a second discharge port 36 through which wash water sucked from the second suction port 34 is discharged. A discharge pipe 37 extends from the second discharge port 36 toward the outside of the pump chamber 33. The suction pipe 35 is formed in a shape extending linearly. The longitudinal direction of the suction pipe 35 is parallel to the tangential direction of the outer periphery of the pump chamber 33, and the tangential direction of the flow of the cleaning water in the pump chamber 33 in the reverse rotation direction when the impeller 15 rotates in the reverse direction. It is provided at a position on the downstream side of the flow. Thereby, the discharge flow path 37a formed inside the discharge pipe 37 is connected to the downstream side of the flow in the tangential direction of the flow of the cleaning water in the pump chamber 33 in the reverse rotation direction. The discharge pipe 37 is connected to a drain drain pipe 37b for draining the washing water out of the dishwasher 1. The drainage drain pipe 37b communicates with the atmosphere at a predetermined drainage place.

  As shown in FIG. 2, the above-described cleaning pump 16 includes a stator 11, a rotor 13, an upper case 26, a pump chamber 27b, a first suction port 28, a first discharge port 30, and the like. The drainage pump 17 described above includes the impeller 15, the lower case 32, the pump chamber 33, the second suction port 34, the second discharge port 36, the suction pipe 35, the discharge pipe 37, and the like. In addition, the motor unit 51 is configured by the stator 11, the rotor 13, and the like. A partition plate 38 is provided between the cleaning pump 16 and the drain pump 17 as a partition for partitioning the cleaning pump 16 and the drain pump 17. The rotary shaft 14 passes through the partition plate 38, and a communication hole 38 a that connects the pump chamber 27 a and the pump chamber 33 is formed around the rotary shaft 14.

  As shown in FIG. 1, the storage tank 7 is provided with a filter 46 that captures residue. In the storage tank 7, a heater 50 is provided for heating the wash water stored in the storage tank 7 to a set temperature.

  In such a configuration, when the tableware 3 to be cleaned is placed in the tableware basket 2 and stored in the tableware storage unit 4 and the cleaning start button is pressed, the storage tank 7 is cleaned by control from a control unit (not shown). Water supply, heating by the supplied cleaning water heater 50, and the like are automatically performed. When the water temperature of the washing water rises to the set temperature, energization to the winding 21 of the stator 11 is started, and the rotor 13 and the impeller 15 start to rotate together with the rotating shaft 14 (rotation in the direction of arrow a).

  By this rotation, the washing water in the flow path 18a of the rotor 13 rises along the flow path 18a, and the raised washing water is pressurized by the centrifugal impeller 13a and discharged from the first discharge port 30. Further, as the cleaning water in the flow path 18a rises, the cleaning water in the storage tank 7 flows into the can 23 from the first suction port 28 through the connection pipe 29, and this cleaning water also flows through the flow path. 18a rises and is discharged from the first discharge port 30. The cleaning water discharged from the first discharge port 30 flows through the connection pipe 31 and is supplied to the nozzle body 6, and is discharged from the nozzle 5 of the nozzle body 6 toward the tableware 3 to clean the tableware 3.

  The washing water discharged from the nozzle 5 returns to the storage tank 7 after washing the tableware 3, and the washing water in the storage tank 7 flows through the connection pipe 29 and flows into the can 23 from the first suction port 28. Then, it rises along the flow path 18a of the rotor 13 and is discharged from the nozzle 5 toward the tableware 3 again. In this way, the wash water in the storage tank 7 is circulated and the tableware 3 is washed.

  At this time, when the impeller 15 rotates forward together with the rotating shaft 14, the cleaning water in the pump chamber 33 is pushed by the inclined surface 15 c of the blade 15 a of the impeller 15 and moves in the forward rotation direction. In this case, since the inclined surface 15c of the blade 15a is inclined with respect to the direction in which the washing water is pushed out by the rotation of the impeller 15, the pushing action is significantly smaller than the action of the acting surface 15b in the case of reverse rotation. Push the fluid in the forward direction. At this time, in this embodiment, as shown in FIG. 3, the suction pipe 35 is arranged so as to be orthogonal to the rotation shaft 14, thereby the suction flow path 35 a is orthogonal to the rotation axis 14 a of the impeller 15. The suction flow path 35a is orthogonal to the rotation direction of the fluid, whereby the discharge of the fluid in the pump chamber 33 to the suction flow path 35a (suction pipe 35) is suppressed. Therefore, the suction of the fluid from the discharge flow path 37a into the pump chamber 33 is also suppressed, so that the suction of air from the drainage drain pipe 37b to the pump chamber 33 is prevented. Thereby, since air entering the pump chamber 27a is suppressed, the driving force of the cleaning pump 16 is sufficiently transmitted to the cleaning water, and a decrease in discharge performance of the cleaning pump 16 can be suppressed. Thereby, the fall of the cleaning performance of the dishwasher 1 can be suppressed. In this way, the possibility that air is sucked into the pump chamber 33 during the cleaning operation can be greatly reduced as compared with the conventional pump.

Next, when a predetermined time has elapsed since the cleaning of the tableware 3 that rotates the rotor 13 in the forward direction is started, the energization pattern for the winding 21 is switched by the control from the control unit, and the rotor 13 and the impeller 15 are rotated by the rotating shaft 14. At the same time, reverse rotation (rotation in the direction of arrow b) is started. This
The cleaning water in the storage tank 7 is sucked into the pump chamber 33 from the second suction port 34, and the cleaning water in the pump chamber 33 is sent from the second discharge port 36 and the discharge pipe 37 into the drainage drain pipe 37b. Drained out of the dishwasher 1. Here, since the suction of air into the pump chamber 33 is prevented during the above-described cleaning operation, the pump chamber 33 is filled with cleaning water, and the driving force of the drain pump 71 during this drainage. Is sufficiently transmitted to the washing water, and the deterioration of the discharge performance of the drain pump 17 is suppressed. Thereby, the fall of the drainage performance of the dishwasher 1 is suppressed. At this time, the cleaning water in the cleaning pump 16 flows into the pump chamber 33 through the communication hole 38a of the partition plate 38 and is drained.

  In the present embodiment, the example in which the suction flow path 35a is connected to the pump chamber 33 in the direction orthogonal to the rotation axis 14a of the impeller 15 is described, but the present invention is not limited to this, and the suction flow path 35a is not limited to the impeller. For example, the suction flow path 35a may be connected to the pump chamber 33 in a direction that obliquely intersects the rotation axis 14a.

  Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those described in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted. Here, FIG. 4 is a longitudinal side view showing the connection pump of the present embodiment.

  As shown in FIG. 4, the present embodiment differs from the first embodiment in the height of the second suction port 34 of the drain pump 71 in the connection pump 70. The second suction port 34 of the present embodiment is disposed at a position above the blade 15 a of the impeller 15. Accordingly, the suction pipe 35 and the suction flow path 35a are also located above the blades 15a of the impeller 15, and the connection position of the suction flow path 35a to the pump chamber 33 is a position above the blades 15a of the impeller 15. It becomes. The second discharge port 36 is disposed at substantially the same height as the impeller blades 15a.

  As described above, in the present embodiment, the connection position of the suction flow path 35a to the pump chamber 33 is set to a position above the blade 15a of the impeller 15, thereby providing the following operational effects. That is, when the impeller 15 rotates forward (cleaning) during cleaning, the cleaning water in the pump chamber 33 swirls in a region in the pump chamber 33 that faces the outer peripheral surface (the working surface 15b and the inclined surface 15c) of the blade 15a. Therefore, the washing water is more difficult to flow into the second suction port 34 located above the blade 15a. Thereby, since the washing water flowing out from the pump chamber 33 is further reduced, the suction of air from the drainage drain pipe 37b into the pump chamber 33 is further suppressed. As a result, the air entering the pump chamber 27a is further suppressed, so that the driving force of the cleaning pump 16 is sufficiently transmitted to the cleaning water, and the deterioration of the discharge performance of the cleaning pump 16 can be further suppressed. Thereby, the fall of the cleaning performance of the dishwasher 1 can be suppressed more. Thus, the effect of preventing air from being sucked into the pump chamber 33 during the cleaning operation is further enhanced.

  Next, when the impeller 15 rotates reversely during drainage, the second suction port 34 is above the blades 15a of the impeller 15, so that the cleaning water can be sucked smoothly without any problem. At this time, since the effect of preventing the inhalation of air into the pump chamber 33 at the time of cleaning is increased, the driving force of the drain pump 71 is sufficiently transmitted to the cleaning water at the time of drainage, and the discharge performance of the drain pump 71 is improved. The decrease can be further suppressed. Thereby, the fall of the drainage performance of the dishwasher 1 can be suppressed more.

  As described above, in the embodiment of the present invention, in the dishwasher 1, the washing pump 16 is disposed above the drainage pump 17 or 71, and the rotary shaft 14 rotates in the positive rotation direction that is the second rotation direction. By installing the connecting pump 9 or 70 so that the drainage pump 17 or 71 functions when the rotary shaft 14 rotates in the reverse rotation direction which is the first rotation direction when the cleaning pump 16 functions. The fall of the drainage performance of the dishwasher 1 can be suppressed.

It is a vertical side view which shows the whole structure of the dishwasher which mounts the pump of 1st embodiment of this invention. It is a vertical side view which expands and shows a part. It is the sectional view on the AA line in FIG. It is a vertical side view which shows the connection pump of 2nd embodiment of this invention. It is a horizontal sectional view showing a conventional drainage pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tableware washing machine 9 Connection pump 14 Rotating shaft 14a Rotating shaft center 15 Impeller 15a Blade 16 Washing pump 17 Drain pump (pump)
33 Pump chamber 35a Suction passage 37a Discharge passage 70 Connection pump 71 Drain pump (pump)

Claims (5)

An impeller is provided in the pump chamber so as to freely rotate forward and backward, and has a different action for pushing out the fluid depending on the direction of rotation. When the rotation direction with a small pushing action is the second rotation direction, the impeller rotates in the first rotation direction, whereby the fluid is sucked into the pump chamber from the suction flow path, and the sucked fluid is discharged into the discharge flow path. From the pump that discharges outside the pump chamber,
A pump characterized in that the suction flow path is connected to the pump chamber in a direction crossing the rotation axis of the impeller.   The pump according to claim 1, wherein the suction flow path is connected to the pump chamber in a direction orthogonal to a rotation axis of the impeller.   3. The pump according to claim 1, wherein a connection position of the suction flow path to the pump chamber is a position higher than a blade of the impeller. Two pumps are connected to a single rotating shaft that can rotate forward and backward, and one of the pumps functions by rotating the rotating shaft in one rotating direction, and the rotating shaft rotates in the other rotating direction. In the connected pump in which the other pump functions,
A pump according to claim 1, wherein at least one of the two pumps is the pump according to claim 1, 2 or 3. It has a coupling pump that connects two pumps, a washing pump that discharges washing water for washing dishes and a drainage pump that drains washing water, to a single rotating shaft that can rotate forward and backward, and rotates in one direction of rotation. In the dishwasher in which one of the washing pump and the drainage pump functions by rotating a shaft, and the other of the washing pump and the drainage pump functions by rotating the rotation shaft in the other rotation direction,
As the connection pump, the cleaning pump is arranged above the drainage pump, and the cleaning pump functions when the rotating shaft rotates in the second rotating direction, and the rotating shaft moves in the first rotating direction. 5. A dishwasher equipped with a connecting pump according to claim 4, wherein the drainage pump functions when rotated.

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