JP2005270245A - Dishwasher washing and drainage pump - Google Patents

Abstract

An object of the present invention is to improve the pump performance without increasing the angle of the suction hole and the drain hole in the rotational direction.
A cleaning pump runner and a drainage pump runner supported by a rotating shaft of an electric motor are placed back to back with a partition plate in between, and the drainage pump runner includes a disc-shaped blade substrate, a partition plate, and the like. A central boss that protrudes in the axial direction at the center of the blade substrate on the opposite side of the blade substrate, and a plurality of centrifugal blades that extend in the axial direction on the side surface of the blade substrate on the opposite side of the partition plate and extend in the outer circumferential direction from the central boss portion. The suction hole of the suction port is provided on the side surface side of the drainage pump casing and on the opposite side of the partition plate.
[Selection] Figure 1

Description

The present invention relates to a washing and draining pump for a dishwasher, and more particularly to improving the performance of a draining pump.

  The washing and drainage pump of the dishwasher has a washing pump and a drainage pump arranged back to back via a partition plate. This washing and draining pump is disclosed in Japanese Patent Laid-Open No. 2001-218722 (Patent Document 1).

JP 2001-218722 A

  The drainage pump of the washing and drainage pump is a centrifugal type pump, and a drainage pump casing is provided with a suction port and a discharge port. The suction hole of the suction port and the drainage hole of the discharge port are arranged such that the angle θ over the rotation direction of the drainage pump runner around the rotation center of the drainage pump runner is less than about 180 degrees.

  In this drainage pump, when the angle θ across the rotation direction of the suction hole and the drainage hole is increased, the acceleration distance by the drainage pump runner is increased and the pump performance is improved. However, the washing and drainage pump may be disposed on the bottom side of the dishwasher, and the angle θ cannot be larger than about 180 degrees, and the structure is almost 90 degrees.

  The present invention addresses the above problems and aims to improve pump performance without increasing the angle of the suction hole and the drain hole in the rotational direction.

  In the present invention, a cleaning pump runner and a drainage pump runner supported by a rotating shaft of an electric motor are placed back to back with a partition plate interposed therebetween, and the drainage pump runner is on the opposite side of the disc-shaped blade substrate and the partition plate. A suction port having a central boss portion protruding in the axial direction at the center of the blade substrate, a plurality of centrifugal blades extending in the axial direction on the side surface of the blade substrate on the opposite side of the partition plate and extending in the outer peripheral direction from the central boss portion The suction hole is provided on the side surface side of the drainage pump casing and on the opposite side of the partition plate.

  According to the present invention, it is possible to improve the pump performance without increasing the angle over the rotation direction of the suction hole and the drain hole.

  An embodiment of the present invention will be described with reference to FIGS.

  The cleaning / drainage pump includes a cleaning pump 1, a drainage pump 2, an electric motor 3, and a cooling fan 4. The cleaning pump 1 and the drainage pump 2 are placed back to back through the partition plate 5.

  The cleaning pump runner 6 of the cleaning pump 1 and the drainage pump runner 7 of the drainage pump 2 are fixedly supported on the rotating shaft 8 of the electric motor 3. The electric motor 3 rotates forward and backward, and the forward rotation causes the cleaning pump 1 to function as a pump, and the reverse rotation causes the drainage pump 2 to function as a pump.

  The cleaning pump 1 has a cleaning pump casing 9 in which a cleaning pump runner 6 is placed. The cleaning pump casing 9 has a suction port 20 and a discharge port 21.

  The cleaning pump runner 6 has a blade substrate 22, a guide plate 23 placed so as to face the blade substrate 22, and a plurality of blades 24 arranged radially between the blade substrate 22 and the guide plate 23. A runner suction port 25 is provided at the center of the guide plate 23. The blade substrate 22 of the cleaning pump runner 6 has a central boss portion 26 at the center. The central boss portion 26 has a shaft support tube 27 extending along the rotation shaft 8 toward the opposite side of the guide plate 22 (in the direction of the partition plate 5).

  The drainage pump 2 has a drainage pump casing 40 in which the drainage pump runner 7 is placed. The drain pump casing 40 and the cleaning pump casing 9 are open on the side to be combined. The partition plate 5 is placed at the combined opening. The inside of the drainage pump casing 40 and the inside of the cleaning pump casing 9 are partitioned by the partition plate 5, and the cleaning pump runner 6 and the drainage pump runner 7 are placed back to back via the partition plate 5.

  The drain pump casing 40 and the cleaning pump casing 9 are joined to each other on the outer circumference side. Since the outer periphery of the partition plate 5 extends over the entire periphery and is sandwiched between the outer periphery of the drainage pump casing 40 and the cleaning pump casing 9, the partition plate 5 is joined together by tying the drainage pump casing 40 and the cleaning pump casing 9 together. It can be stopped.

  The partition plate 5 has a cylindrical body 41 extending in the axial direction so as to protrude from the cleaning pump casing 9 and the drainage pump casing 40 at the center. The shaft support cylinder 27 is inserted into the cylindrical body 41 extending toward the cleaning pump casing 9 so as to be placed therein. Labyrinth means 42 is provided on the end side of the cylindrical body 41 at the washing pump casing.

  As shown in FIG. 7, the labyrinth means 42 includes an inner peripheral ring 42a and a small protrusion ring 42b provided at the center of the inner peripheral surface of the inner peripheral ring 42a. The small protrusion ring 42b has a width T of about 2 mm and a gap G with the rotation shaft of about 0.25 mm.

  The drainage pump runner 7 includes a disc-shaped blade substrate 43, a central boss portion 44 protruding in the axial direction at the center of the blade substrate 43 on the opposite side of the partition plate 5, and a side surface of the blade substrate 43 on the opposite side of the partition plate 5. And a plurality of centrifugal blades 45 extending in the axial direction and extending from the central boss portion 44 in the outer peripheral direction. The central boss portion 44 has a labyrinth groove 46. The labyrinth groove 46 is formed deep in the central boss portion 44 along the axial direction from the partition plate 5. In the labyrinth groove 46, the portion of the cylindrical body 41 protruding toward the drainage pump casing is inserted.

  In this way, the cleaning pump casing 9 and the drainage pump casing 40 are partitioned by the partition plate 5, and the seal on the rotating portion side of the partition plate 5 is the labyrinth formed in the labyrinth groove 46 and the cylindrical body 41, and the labyrinth of the cylindrical body 41. Consists of means 42. With such a labyrinth seal, it is difficult for water to flow between the cleaning pump casing 9 and the drainage pump casing 40, and since there is no contact, there is no rotational friction loss.

  The drainage pump casing 40 has a suction port 60 and a discharge port 61. The suction hole 62 of the suction port 60 is provided in the casing side surface portion of the drainage pump casing 40. The discharge hole 63 of the discharge port 61 is provided in the outer peripheral portion of the drainage pump casing 40. The suction hole 62 and the discharge hole 63 are arranged at an angle θ in the rotation direction of the drainage pump runner around the rotation center of the drainage pump runner.

  Since the suction holes 62 are provided in the casing outer periphery and the casing side surface, suction is performed directly from the centrifugal blade 45. That is, conventionally, it is sucked into the outer peripheral portion of the drainage pump casing, in other words, the outer periphery of the drainage pump runner. On the other hand, in the embodiment of the present invention, since suction is performed from the outer peripheral portion and the side surface portion of the centrifugal blade 4 of the drainage pump runner 7, the fluid resistance on the suction side is reduced and strong suction is obtained. For this reason, the amount of suction is increased, and the pump performance can be improved without increasing the angle of the suction hole and the drain hole in the rotational direction.

  Further, the suction hole 62 has a substantially triangular shape when viewed from the rotation axis direction of the drainage pump runner 7. The suction hole 62 whose opening area increases in the rotation direction of the drainage pump runner 7 has a larger area than the discharge hole 63. Since the suction hole 62 having a large opening area faces the side surface of the centrifugal blade 4, the fluid resistance on the suction side is reduced and efficient suction is performed.

  In the center of the casing side portion of the drainage pump casing 40, a seal support cylinder portion 70 extending in a direction away from the partition plate 5 is provided. The seal support cylinder portion 70 holds a seal member 71 that is in sliding contact with the outer periphery of the rotary shaft 8.

  The seal support cylinder part 70 has an annular protrusion 72 on the inner diameter edge facing the drainage pump runner 7. The centrifugal blade 45 protrudes from the central boss portion 44 toward the seal support cylinder portion 70. The inner peripheral diameter of the centrifugal blade 45 is larger than the outer diameter of the annular protrusion 72.

  The centrifugal blade 45 protrudes from the central boss portion 44 and the pumping performance of the drainage pump 2 is improved by increasing the height from the blade substrate 43.

  In addition, since the annular protrusion 72 is provided on the seal support cylinder portion 70, the annular protrusion 72 serves as a barrier, and water flow and foreign matters are prevented from entering the seal member 71 during operation.

  In order to suppress the wraparound of water flow and foreign matter and improve the pump performance, it is desirable to wrap the inner peripheral diameter side of the centrifugal blade 45 and the outer diameter side of the annular protrusion 72 as much as possible.

  Based on FIG. 8, FIG. 9, other embodiment regarding the rotation stop with a washing | cleaning pump runner and a drainage runner is described.

  A stopper 75 for positioning the drainage pump runner 7 in the axial direction is provided on the rotary shaft 8. The stopper 75 is attached by being fitted into the retaining ring groove of the rotary shaft 8.

  The rotation shaft insertion hole 76 of the central boss portion 44 of the drainage pump runner 7 is circular. The rotation shaft insertion hole of the shaft support tube 27 of the cleaning pump runner 6 is circular, and has a non-rotating flat portion 77 in part.

  The rotating shaft 8 has a small diameter portion 78 on the tip side. The small-diameter portion 78 is circular, and a stopper stopper 79 is attached to prevent the drainage pump runner 7 and the cleaning pump runner 6 from coming off. The rotating shaft 8 has a flat portion 80 at the back side portion of the small diameter portion 78. The flat portion 80 is provided up to the place corresponding to the cleaning pump runner 6. A flat portion 80 is not provided at a place corresponding to the drainage pump runner 7. The flat part 80 only needs to correspond to the cleaning pump runner 6, and the number of milling points to be flattened can be reduced.

  The drainage pump runner 7 is prevented from rotating with respect to the rotating shaft 8 by combining the flat portion 80 of the rotating shaft 8 with the non-rotating flat portion 77 of the cleaning pump runner 6.

  A recess 81 is provided in the shaft support tube 27 of the cleaning pump runner 6, and a protrusion 82 is provided in the central boss portion 44 of the drainage pump runner 7. The projection 82 and the recess 81 are fitted to each other, and the cleaning pump runner 6 and the drainage pump runner 7 are prevented from rotating together. The washing pump runner 6 is prevented from rotating about the rotating shaft 8 in the same manner as the drainage pump runner 7 through the mutual rotation prevention.

The vertical cross-sectional view of the washing and draining pump according to the embodiment of the present invention. The figure which concerns on embodiment of this invention and shows the partial combination of a drainage pump and an electric motor. The figure which concerns on embodiment of this invention and shows the state by which the drainage pump was removed by the partial combination of the drainage pump and the electric motor. The figure which concerns on embodiment of this invention and looked at the drainage pump casing and drainage pump runner of the drainage pump from the axial direction. The perspective view which concerns on embodiment of this invention and looked at the drainage pump casing and drainage pump runner of the drainage pump from the axial direction. The perspective view of the drainage pump casing which concerns on embodiment of this invention and the drainage pump runner was removed. FIG. 2 is an enlarged view of a portion A in FIG. 1 according to the embodiment of the present invention. The figure which concerns on other embodiment of this invention, and shows the rotation prevention structure of a washing pump runner and a drainage runner, and a rotating shaft. The figure which concerns on other embodiment of this invention, and shows the rotation prevention structure of a washing pump runner and a drainage runner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 ... Cleaning pump casing, 6 ... Cleaning pump runner, 1 ... Cleaning pump, 3 ... Electric motor, 2 ... Drain pump, 40 ... Drain pump casing, 22 ... Partition plate, 60 ... Suction port, 61 ... Discharge port, 62 ... Suction Hole 63, discharge hole, 43 disk-shaped blade substrate, 44 central boss part, 45 a plurality of centrifugal blades.

Claims (7)

A cleaning pump having a cleaning pump runner in the cleaning pump casing, a drain pump having a drain pump runner in the drain pump casing, and an electric motor for rotationally driving the cleaning pump runner and the drain pump runner,
The washing pump and the drainage pump are arranged next to each other, and the electric motor is arranged on the side of the drainage pump,
Separating the inside of the washing pump casing and the drainage pump casing, and having a partition plate,
The drain pump casing is provided with a suction port and a discharge port,
The suction hole of the suction port and the discharge hole of the discharge port are arranged such that an angle θ in the rotation direction of the drainage pump runner centered on the rotation center of the drainage pump runner is about 180 degrees or less. In the dishwasher washing and draining pump
The washing pump runner and the drainage pump runner supported by the rotating shaft of the electric motor are placed back to back with the partition plate in between,
The drainage pump runner includes a disc-shaped blade substrate, a central boss portion protruding in the axial direction at the center of the blade substrate on the opposite side of the partition plate, and an axial direction on the side surface of the blade substrate on the opposite side of the partition plate. And having a plurality of centrifugal blades extending in the outer peripheral direction from the central boss portion,
The suction / drainage pump for a dishwasher, wherein the suction hole of the suction port is provided on a side surface side of the drainage pump casing and on a side opposite to the partition plate. In the washing and draining pump of the dishwasher according to claim 1,
A washing and draining pump of a washing machine, wherein an opening area of the suction hole is larger than an opening area of the discharge hole. In the washing and draining pump of the dishwasher according to claim 1,
The suction and drainage pump of the dishwasher, wherein the suction hole has a substantially triangular shape when viewed from the rotation axis direction of the drainage pump runner. A cleaning pump having a cleaning pump runner in the cleaning pump casing, a drain pump having a drain pump runner in the drain pump casing, and an electric motor for rotationally driving the cleaning pump runner and the drain pump runner,
The washing pump and the drainage pump are arranged next to each other, and the electric motor is arranged on the side of the drainage pump,
In a washing and draining pump of a dishwasher having a partition plate separating the inside of the washing pump casing and the drainage pump casing,
In the center of the partition plate, a cylindrical body extending in the axial direction so as to protrude from the cleaning pump casing and the drainage pump casing is provided,
The washing pump runner and the drainage pump runner supported by the rotating shaft of the electric motor are placed back to back with the partition plate in between,
The drainage pump runner includes a disc-shaped blade substrate, a central boss portion protruding in the axial direction at the center of the blade substrate on the opposite side of the partition plate, and an axial direction on the side surface of the blade substrate on the opposite side of the partition plate. And having a plurality of centrifugal blades extending in the outer peripheral direction from the central boss portion,
The central boss has a labyrinth groove into which the cylindrical body protruding toward the drainage pump casing is inserted,
A shaft support cylinder provided at a central boss portion of the cleaning pump runner is placed in the cylindrical body protruding from the cleaning pump casing, and a labyrinth means is provided on the end of the cleaning pump casing of the cylindrical body. Dishwasher washing and drainage pump. In the washing and draining pump of the dishwasher according to claim 1 or 4,
The washing and draining pump for a dishwasher, wherein the washing pump runner is prevented from rotating on the rotating shaft, and the washing pump runner and the drainage pump runner are mutually prevented from rotating. In the washing and draining pump of the dishwasher according to claim 1 or 4,
The drainage pump casing has a casing outer peripheral portion and a casing side portion,
In the center of the casing side portion, a seal support tube portion extending in a direction away from the partition plate is provided, and a seal member that is in sliding contact with the outer periphery of the rotating shaft is held in the seal support tube portion,
The seal support tube portion has an annular protrusion on an inner diameter edge facing the drainage pump runner,
A washing and draining pump for a dishwasher, wherein the inner diameter of the centrifugal blade is larger than the outer diameter of the annular protrusion. In the washing and drainage pump of the dishwasher according to claim 6,
The washing / drainage pump of a dishwasher, wherein the centrifugal blade protrudes toward the seal support cylinder part from the central boss part.

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