US20150196188A1 - Dishwasher and fan - Google Patents
Dishwasher and fan Download PDFInfo
- Publication number
- US20150196188A1 US20150196188A1 US14/593,339 US201514593339A US2015196188A1 US 20150196188 A1 US20150196188 A1 US 20150196188A1 US 201514593339 A US201514593339 A US 201514593339A US 2015196188 A1 US2015196188 A1 US 2015196188A1
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- United States
- Prior art keywords
- flange
- fan
- wall
- dishwasher
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005406 washing Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/48—Drying arrangements
- A47L15/488—Connections of the tub with the ambient air, e.g. air intake or venting arrangements
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4251—Details of the casing
- A47L15/4257—Details of the loading door
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/48—Drying arrangements
- A47L15/486—Blower arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/706—Humidity separation
Definitions
- This invention relates to a dishwasher and in particular, to a fan for the dishwasher for exhausting moist air from the washing chamber of the dishwasher.
- a dishwasher typically includes a washing chamber, a door for closing an opening of the washing chamber, a sump for storing wash water, spray nozzles for spraying wash water, a heater for heating the wash water, and a fan for exhausting moist air from the washing chamber via a discharge duct which is in fluid communication with the sump.
- the fan In a known dishwasher, the fan is arranged between the outer wall and the inner wall of the door and water sprayed by the nozzles might enter into the fan.
- the discharge duct When the door is closed the discharge duct is connected to the sump to return water sprayed into the fan back to the sump.
- the discharge duct is disconnected from the sump and water in the duct will leak to the floor, worsening the sanitation condition in the kitchen.
- the present invention provides a dishwasher, comprising: a cabinet which defines a washing chamber; a door for opening and closing an opening of the washing chamber; and a fan for exhausting moist air from the washing chamber, the fan being arranged between an outer wall and an inner wall of the door, in fluid communication with the washing chamber via at least one vent hole formed in the inner wall, and comprising a housing with an inlet and an outlet, an impeller disposed in the housing, and an electric motor for driving the impeller; wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
- an inner diameter of the flange gradually decreases in a direction from the edge of the inlet towards the impeller.
- a bottom inner surface of the flange in the vertical direction forms an inclined angle ⁇ that is less than 45 degrees relative to the axial direction of the motor.
- the flange extends axially from the edge of the inlet.
- the distance between the flange and the inner wall is less than 0.5 mm.
- the housing comprises a base with a side plate, and a cover assembled to the base and having a ring wall extending from one axial end surface of the cover facing the inner wall, the inlet being formed in the cover; wherein a groove is formed between the ring wall and the side plate; and a seal ring in water-tight contact with the inner wall is disposed in the groove.
- the distance between the flange and the inner wall is greater than the distance between the ring wall and the inner wall.
- the flange extends outwardly from the edge of the inlet towards the inner wall.
- the flange extends inwardly from the edge of the inlet towards the impeller.
- the flange extends from the edge of the inlet on both axial sides of the cover.
- a ratio between the distance D between the flange and the inner wall and an axial length L of the flange is less than 10%.
- the fan is disposed such that an axial direction of the motor is perpendicular to the inner wall.
- the present invention provides a fan of a dishwasher for exhausting moist air from a washing chamber of the dishwasher, comprises a housing with an inlet and an outlet, an impeller disposed in the housing, and an electric motor for driving the impeller; wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
- an inner diameter of the flange gradually decreases in a direction from the edge of the inlet towards the impeller.
- an inner surface of the flange forms an inclined angle ⁇ that is less than 45 degrees relative to an axial direction of the motor.
- the flange extends axially from the edge of the inlet.
- the motor is a low voltage direct current motor with an input voltage of less than 60V and an output power of less than 0.5 Watt.
- the flange extends outwardly from the edge of the inlet.
- the flange extends inwardly from the edge of the inlet towards the impeller.
- the flange extends from the edge of the inlet on both axial sides of the cover.
- the flange has an axial length L that is greater than 2 mm.
- FIG. 1 is a schematic representation of a dishwasher in accordance with a preferred embodiment of the present invention
- FIG. 2 is a sectional view of a fan and an inner wall of a door of the dishwasher of FIG. 1 ;
- FIG. 3 illustrates a cover of the fan of FIG. 2 ;
- FIG. 4 is an enlarged view of a part of FIG. 2 ;
- FIG. 5 is a sectional view of the cover of the fan in accordance with another embodiment of the present invention.
- FIG. 6 is a sectional view of the cover of the fan in accordance with yet another embodiment of the present invention.
- FIG. 7 is a sectional view of an electric motor of the fan of FIG. 2 .
- FIG. 1 is a schematic representation of a dishwasher 10 in accordance with an embodiment of the present invention.
- the dishwasher 10 includes a cabinet 16 , a washing chamber 22 disposed within the cabinet 16 , a sump (not shown in the figure) at the bottom of the washing chamber 22 for storing wash water and an opening for adding and removing items to be washed.
- a door 20 is arranged to close the opening in the washing chamber 22 and a fan 24 is located within the door, between the outer wall 12 and the inner wall 14 , for drying the inside of the washing chamber 22 .
- the washing chamber 22 is provided with baskets (not shown in the figure) for receiving objects to be washed, spray nozzles (not shown in the figure) for spraying wash water, and a heater (not shown in the figure) for heating the wash water.
- the fan 24 is preferably arranged at the upper portion of the door 20 . Moist air in the washing chamber 22 is extracted from the washing chamber 22 via the discharge duct 26 .
- FIG. 2 is a sectional view of the fan 24 and the inner wall 14 of the door 20 .
- the fan 24 comprises a fan housing with a base 30 and a cover 32 assembled to each other, an impeller 34 disposed in the fan housing, and an electric motor 36 for driving the impeller 34 .
- the fan 24 is arranged such that the shaft 48 of the motor 36 is perpendicular to the inner wall 14 of the door 20 , with the inlet 38 of the fan 24 facing vent holes 40 in the inner wall 14 .
- the base 30 of the fan housing has a bottom plate 42 and an annular side plate 44 axially extending from the outer periphery of the bottom plate 42 .
- the motor 36 is received in a motor sleeve 46 extending from the center of the bottom plate 42 .
- the shaft 48 of the motor 36 passes through the bottom plate 42 and enters into the fan housing to connect with the impeller 34 .
- the side plate 44 of the base 30 has an outlet 50 .
- the outlet 50 extends downwardly in the radial direction and is connected to the discharge duct 26 .
- FIG. 3 illustrates the cover 32 of the fan 24 .
- FIG. 4 is an enlarged view of a part of FIG. 2 showing part of the fan 24 and the inner wall 14 of the door 20 .
- the cover 32 is assembled to the base 30 and comprises a circular disk body 52 and a ring wall 56 that extends from the outer periphery 54 of one axial end surface of the disk body 52 facing the inner wall 14 of the door 20 .
- the ring wall 56 , the axial end portion 58 of the side plate 44 of the base 30 adjacent the inner wall 14 , and the outer periphery 54 of the disk body 52 define an annular groove 60 .
- a seal ring 62 is disposed inside the annular groove 60 and in water-tight contact with the inner wall 14 .
- the inlet 38 has an edge 39 which is the inner surface of the opening formed at the center of the cover 32 . That is, the edge 39 is the inner edge of the disk body 52 .
- a flange 64 is formed at the edge 39 . In this embodiment, the flange 64 axially extends from the edge 39 on both axial sides of the disk body 52 .
- the distance D between the flange 64 and the inner wall 14 is smaller than 0.5 mm.
- the flange 64 does not extend as far as the ring wall 56 , such that the distance between the outer axial end surface 66 of the flange 64 and the inner wall 14 is greater than the distance between the outer axial end surface 68 of the ring wall 56 and the inner wall 14 .
- the flange 64 has an axial length L greater than 2 mm.
- the ratio of the distance D between the flange 64 and the inner wall 14 and the axial length L of the flange 64 is smaller than 10%.
- the motor 36 is a low voltage direct current (LVDC) motor.
- the input voltage of the LVDC motor is less than 60V and the output power of the LVDC motor is less than 0.5 Watt.
- BLDC brushless direct current
- the performance of the LVDC motor fan is better and the cost of the LVDC motor fan is less as no controller is required.
- Table 1 is a comparison of the dishwashers using the three different types of motor. In the table, “3” means the test result is the best, “1” means the test result is the worst.
- the table shows the LVDC motor in the present invention has advantages in controllability, safety, system cost and efficiency.
- FIG. 5 illustrates the cover 32 of the fan in accordance with another embodiment of the present invention.
- the cover 32 is arranged in the vertical direction in use.
- the flange 64 extends from the edge 39 of the inlet 38 (or disk body 52 ) towards the impeller 34 and the inner diameter of the flange 64 gradually decreases along this direction.
- the bottom inner surface 70 of the flange 64 in the vertical direction forms an inclined angle ⁇ relative to the axial direction.
- the angle ⁇ is preferably smaller than 45 degrees.
- FIG. 6 illustrates the cover 32 of the fan in accordance with yet another embodiment of the present invention.
- the cover 32 is arranged in the vertical direction in use.
- the flange 64 extends from the edge 39 of the inlet 38 on both axial sides of the disk body 52 and the inner diameter of the flange 64 gradually decreases along the direction from the edge 39 towards the impeller 34 .
- the bottom inner surface 70 of the flange 64 in the vertical direction forms an inclined angle ⁇ , preferably smaller than 45 degrees, relative to the axial direction.
- the radial outer surface of the flange 64 at the axial outer side of the disk body 52 can block water running down the disk body 52 from entering the inlet 38 and the radially inner surface of the flange 64 can guide water hitting the top inner surface 72 to go outside of the fan housing along the downwardly sloping surface formed by the bottom inner surface 70 of the flange 64 .
- FIG. 7 illustrates the motor 36 .
- the motor 36 is a low voltage direct current (LVDC) motor with a rotor and a stator surrounding the rotor.
- the rotor comprises a shaft 48 , a rotor core 82 fixed on the shaft 48 , a commutator 84 fixed on the shaft 48 adjacent the rotor core 82 , rotor windings (not shown in the figure) wound about poles of the rotor core 82 and electrically connected to the commutator 84 .
- Outer surfaces of the rotor poles form a circle. Slots are formed between adjacent rotor poles for accommodating the rotor windings.
- the stator comprises an axially extending round housing 86 having an open end and a closed end, at least one permanent magnet 88 fixed to the inner surface of the housing 86 and an end cap 90 closing the open end of the housing 86 .
- Brushes 92 connected to an external LVDC power, preferably lower than 60 V, via electrical terminals (not shown in the figure) are supported by the end cap 90 for making sliding contact with the commutator 84 to supply power to the rotor windings.
- the shaft 48 is rotatably supported by two bearings 94 received in bearing holders 96 at each end of the motor.
Abstract
A dishwasher includes a cabinet defining a washing chamber, a door for closing an opening of the washing chamber and a fan for exhausting moist air from the washing chamber. The fan is arranged between an outer wall and an inner wall of the door, in fluid communication with the washing chamber via at least one vent hole formed in the inner wall, and includes a housing with an inlet and an outlet, an impeller in the housing and an electric motor for driving the impeller. The fan is arranged such that an axial direction of the motor is perpendicular to the inner wall. A flange is formed at an edge of the inlet to restrict water from entering the housing.
Description
- This non-provisional patent application claims priority under 35 U.S.C. §119(a) from Patent Applications No. 201410013161.4 and No. 201410013176.0 both filed in The People's Republic of China on Jan. 10, 2014, the entire contents of which are hereby incorporated by reference.
- This invention relates to a dishwasher and in particular, to a fan for the dishwasher for exhausting moist air from the washing chamber of the dishwasher.
- A dishwasher typically includes a washing chamber, a door for closing an opening of the washing chamber, a sump for storing wash water, spray nozzles for spraying wash water, a heater for heating the wash water, and a fan for exhausting moist air from the washing chamber via a discharge duct which is in fluid communication with the sump.
- In a known dishwasher, the fan is arranged between the outer wall and the inner wall of the door and water sprayed by the nozzles might enter into the fan. When the door is closed the discharge duct is connected to the sump to return water sprayed into the fan back to the sump. However, when the door is open, the discharge duct is disconnected from the sump and water in the duct will leak to the floor, worsening the sanitation condition in the kitchen.
- Hence there is a desire for a dishwasher with less or no sprayed water entering into the fan.
- Accordingly, in one aspect thereof, the present invention provides a dishwasher, comprising: a cabinet which defines a washing chamber; a door for opening and closing an opening of the washing chamber; and a fan for exhausting moist air from the washing chamber, the fan being arranged between an outer wall and an inner wall of the door, in fluid communication with the washing chamber via at least one vent hole formed in the inner wall, and comprising a housing with an inlet and an outlet, an impeller disposed in the housing, and an electric motor for driving the impeller; wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
- Preferably, an inner diameter of the flange gradually decreases in a direction from the edge of the inlet towards the impeller.
- Preferably, a bottom inner surface of the flange in the vertical direction forms an inclined angle θ that is less than 45 degrees relative to the axial direction of the motor.
- Preferably, the flange extends axially from the edge of the inlet.
- Preferably, the distance between the flange and the inner wall is less than 0.5 mm.
- Preferably, the housing comprises a base with a side plate, and a cover assembled to the base and having a ring wall extending from one axial end surface of the cover facing the inner wall, the inlet being formed in the cover; wherein a groove is formed between the ring wall and the side plate; and a seal ring in water-tight contact with the inner wall is disposed in the groove.
- Preferably, the distance between the flange and the inner wall is greater than the distance between the ring wall and the inner wall.
- Preferably, the flange extends outwardly from the edge of the inlet towards the inner wall.
- Preferably, the flange extends inwardly from the edge of the inlet towards the impeller.
- Preferably, the flange extends from the edge of the inlet on both axial sides of the cover.
- Preferably, a ratio between the distance D between the flange and the inner wall and an axial length L of the flange is less than 10%.
- Preferably, the fan is disposed such that an axial direction of the motor is perpendicular to the inner wall.
- According to a second aspect, the present invention provides a fan of a dishwasher for exhausting moist air from a washing chamber of the dishwasher, comprises a housing with an inlet and an outlet, an impeller disposed in the housing, and an electric motor for driving the impeller; wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
- Preferably, an inner diameter of the flange gradually decreases in a direction from the edge of the inlet towards the impeller.
- Preferably, an inner surface of the flange forms an inclined angle θ that is less than 45 degrees relative to an axial direction of the motor.
- Preferably, the flange extends axially from the edge of the inlet.
- Preferably, the motor is a low voltage direct current motor with an input voltage of less than 60V and an output power of less than 0.5 Watt.
- Preferably, the flange extends outwardly from the edge of the inlet.
- Preferably, the flange extends inwardly from the edge of the inlet towards the impeller.
- Preferably, the flange extends from the edge of the inlet on both axial sides of the cover.
- Preferably, the flange has an axial length L that is greater than 2 mm.
- Preferred embodiments of the invention will now be described, by way of example only, with reference to figures of the accompanying drawings. In the figures, identical structures, elements or parts that appear in more than one figure are generally labeled with a same reference numeral in all the figures in which they appear. Dimensions of components and features shown in the figures are generally chosen for convenience and clarity of presentation and are not necessarily shown to scale. The figures are listed below.
-
FIG. 1 is a schematic representation of a dishwasher in accordance with a preferred embodiment of the present invention; -
FIG. 2 is a sectional view of a fan and an inner wall of a door of the dishwasher ofFIG. 1 ; -
FIG. 3 illustrates a cover of the fan ofFIG. 2 ; -
FIG. 4 is an enlarged view of a part ofFIG. 2 ; -
FIG. 5 is a sectional view of the cover of the fan in accordance with another embodiment of the present invention; -
FIG. 6 is a sectional view of the cover of the fan in accordance with yet another embodiment of the present invention; and -
FIG. 7 is a sectional view of an electric motor of the fan ofFIG. 2 . -
FIG. 1 is a schematic representation of adishwasher 10 in accordance with an embodiment of the present invention. Thedishwasher 10 includes acabinet 16, awashing chamber 22 disposed within thecabinet 16, a sump (not shown in the figure) at the bottom of thewashing chamber 22 for storing wash water and an opening for adding and removing items to be washed. A door 20 is arranged to close the opening in thewashing chamber 22 and afan 24 is located within the door, between theouter wall 12 and theinner wall 14, for drying the inside of thewashing chamber 22. Thewashing chamber 22 is provided with baskets (not shown in the figure) for receiving objects to be washed, spray nozzles (not shown in the figure) for spraying wash water, and a heater (not shown in the figure) for heating the wash water. Thefan 24 is preferably arranged at the upper portion of the door 20. Moist air in thewashing chamber 22 is extracted from thewashing chamber 22 via the discharge duct 26. -
FIG. 2 is a sectional view of thefan 24 and theinner wall 14 of the door 20. Thefan 24 comprises a fan housing with abase 30 and acover 32 assembled to each other, animpeller 34 disposed in the fan housing, and anelectric motor 36 for driving theimpeller 34. Preferably, thefan 24 is arranged such that theshaft 48 of themotor 36 is perpendicular to theinner wall 14 of the door 20, with theinlet 38 of thefan 24 facingvent holes 40 in theinner wall 14. - The
base 30 of the fan housing has abottom plate 42 and anannular side plate 44 axially extending from the outer periphery of thebottom plate 42. Themotor 36 is received in amotor sleeve 46 extending from the center of thebottom plate 42. Theshaft 48 of themotor 36 passes through thebottom plate 42 and enters into the fan housing to connect with theimpeller 34. Theside plate 44 of thebase 30 has an outlet 50. Preferably, the outlet 50 extends downwardly in the radial direction and is connected to the discharge duct 26. -
FIG. 3 illustrates thecover 32 of thefan 24.FIG. 4 is an enlarged view of a part ofFIG. 2 showing part of thefan 24 and theinner wall 14 of the door 20. Thecover 32 is assembled to thebase 30 and comprises acircular disk body 52 and aring wall 56 that extends from theouter periphery 54 of one axial end surface of thedisk body 52 facing theinner wall 14 of the door 20. Thering wall 56, the axial end portion 58 of theside plate 44 of thebase 30 adjacent theinner wall 14, and theouter periphery 54 of thedisk body 52 define anannular groove 60. Aseal ring 62 is disposed inside theannular groove 60 and in water-tight contact with theinner wall 14. Thus, the fan housing and theinner wall 14 of the door 20 are sealingly connected to each other so as to prevent the heated moist air, after flowing through thevent holes 40, from leaking from a gap between the fan housing and theinner wall 14 of the door 20. Theinlet 38 has anedge 39 which is the inner surface of the opening formed at the center of thecover 32. That is, theedge 39 is the inner edge of thedisk body 52. Aflange 64 is formed at theedge 39. In this embodiment, theflange 64 axially extends from theedge 39 on both axial sides of thedisk body 52. Preferably, the distance D between theflange 64 and theinner wall 14 is smaller than 0.5 mm. By this configuration, at least some of the wash water sprayed by the nozzle, that passes through the vent holes 40, is blocked by theflange 64 from entering the fan housing via theinlet 38. Theflange 64 does not extend as far as thering wall 56, such that the distance between the outeraxial end surface 66 of theflange 64 and theinner wall 14 is greater than the distance between the outeraxial end surface 68 of thering wall 56 and theinner wall 14. - Preferably, the
flange 64 has an axial length L greater than 2 mm. The ratio of the distance D between theflange 64 and theinner wall 14 and the axial length L of theflange 64 is smaller than 10%. - Preferably, the
motor 36 is a low voltage direct current (LVDC) motor. The input voltage of the LVDC motor is less than 60V and the output power of the LVDC motor is less than 0.5 Watt. Compared to the brushless direct current (BLDC) motor and the shaded pole motor in traditional fans, the performance of the LVDC motor fan is better and the cost of the LVDC motor fan is less as no controller is required. Below table 1 is a comparison of the dishwashers using the three different types of motor. In the table, “3” means the test result is the best, “1” means the test result is the worst. The table shows the LVDC motor in the present invention has advantages in controllability, safety, system cost and efficiency. -
TABLE 1 Noise System Controll- Motor System Efficiency cost ability Safety noise noise Lifespan Size Total LVDC 3 3 3 3 1 2 2 2 19 Motor BLDC 2 1 1 2 3 3 3 3 18 Motor Shaded 1 2 3 1 2 1 3 1 14 Pole Motor -
FIG. 5 illustrates thecover 32 of the fan in accordance with another embodiment of the present invention. Thecover 32 is arranged in the vertical direction in use. In this embodiment, theflange 64 extends from theedge 39 of the inlet 38 (or disk body 52) towards theimpeller 34 and the inner diameter of theflange 64 gradually decreases along this direction. The bottominner surface 70 of theflange 64 in the vertical direction forms an inclined angle θ relative to the axial direction. The angle θ is preferably smaller than 45 degrees. By this configuration, as shown by the arrows in the figure, water sprayed by the nozzle, after hitting the topinner surface 72 of theflange 64, will fall down onto the bottominner surface 70 and then flow out of the inlet along the downwardly sloping surface. -
FIG. 6 illustrates thecover 32 of the fan in accordance with yet another embodiment of the present invention. Thecover 32 is arranged in the vertical direction in use. In this embodiment, theflange 64 extends from theedge 39 of theinlet 38 on both axial sides of thedisk body 52 and the inner diameter of theflange 64 gradually decreases along the direction from theedge 39 towards theimpeller 34. The bottominner surface 70 of theflange 64 in the vertical direction forms an inclined angle θ, preferably smaller than 45 degrees, relative to the axial direction. In this embodiment, the radial outer surface of theflange 64 at the axial outer side of thedisk body 52 can block water running down thedisk body 52 from entering theinlet 38 and the radially inner surface of theflange 64 can guide water hitting the topinner surface 72 to go outside of the fan housing along the downwardly sloping surface formed by the bottominner surface 70 of theflange 64. -
FIG. 7 illustrates themotor 36. Themotor 36 is a low voltage direct current (LVDC) motor with a rotor and a stator surrounding the rotor. The rotor comprises ashaft 48, a rotor core 82 fixed on theshaft 48, acommutator 84 fixed on theshaft 48 adjacent the rotor core 82, rotor windings (not shown in the figure) wound about poles of the rotor core 82 and electrically connected to thecommutator 84. Outer surfaces of the rotor poles form a circle. Slots are formed between adjacent rotor poles for accommodating the rotor windings. The stator comprises an axially extending round housing 86 having an open end and a closed end, at least onepermanent magnet 88 fixed to the inner surface of the housing 86 and an end cap 90 closing the open end of the housing 86.Brushes 92 connected to an external LVDC power, preferably lower than 60 V, via electrical terminals (not shown in the figure) are supported by the end cap 90 for making sliding contact with thecommutator 84 to supply power to the rotor windings. Theshaft 48 is rotatably supported by two bearings 94 received in bearingholders 96 at each end of the motor. - In the description and claims of the present application, each of the verbs “comprise”, “include”, “contain” and “have”, and variations thereof, are used in an inclusive sense, to specify the presence of the stated item or feature but do not preclude the presence of additional items or features.
- It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination.
- The embodiments described above are provided by way of example only and various modifications will be apparent to persons skilled in the field without departing from the scope of the invention as defined by the appended claims.
Claims (22)
1. A dishwasher, comprising:
a cabinet which defines a washing chamber;
a door for closing an opening of the washing chamber; and
a fan for exhausting moist air from the washing chamber, the fan being arranged between an outer wall and an inner wall of the door, in fluid communication with the washing chamber via at least one vent hole formed in the inner wall, and comprising a housing with an inlet and an outlet, an impeller disposed in the housing and an electric motor for driving the impeller;
wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
2. The dishwasher of claim 1 , wherein an inner diameter of the flange gradually decreases along a direction from the edge of the inlet towards the impeller.
3. The dishwasher of claim 2 , wherein a bottom inner surface of the flange in the vertical direction forms an inclined angle θ that is less than 45 degrees relative to the axial direction of the motor.
4. The dishwasher of claim 1 , wherein the flange axially extends from the edge of the inlet.
5. The dishwasher of claim 1 , wherein the distance between the flange and the inner wall is less than 0.5 mm.
6. The dishwasher of claim 1 , wherein the housing comprises a base with a side plate, and a cover assembled to the base and having a ring wall extending from one axial end surface of the cover facing the inner wall, the inlet being formed on the cover;
a groove is formed between the ring wall and the side plate; and
a seal ring in water tight contact with the inner wall is disposed in the groove.
7. The dishwasher of claim 6 , wherein the distance between the flange and the inner wall is greater than the distance between the ring wall and the inner wall.
8. The dishwasher of claim 1 , wherein the flange extends outwardly from the edge of the inlet towards the inner wall.
9. The dishwasher of claim 1 , wherein the flange extends inwardly from the edge of the inlet towards the impeller.
10. The dishwasher of claim 1 , wherein the flange extends from the edge of the inlet towards both axial sides of the cover.
11. The dishwasher of claim 1 , wherein a ratio between the distance D between the flange and the inner wall and an axial length L of the flange is less than 10%.
12. The dishwasher of claim 1 , wherein the fan is disposed such that an axial direction of the motor is perpendicular to the inner wall.
13. A fan of a dishwasher for exhausting moist air from a washing chamber of the dishwasher, comprises a housing with an inlet and an outlet, an impeller disposed in the housing, and an electric motor for driving the impeller;
wherein a flange is formed at an edge of the inlet for blocking water from entering the housing.
14. The fan of claim 13 , wherein an inner diameter of the flange gradually decreases along a direction from the edge of the inlet towards the impeller.
15. The fan of claim 14 , wherein an inner surface of the flange forms an inclined angle θ that is less than 45 degrees relative to an axial direction of the motor.
16. The fan of claim 13 , wherein the flange extends axially from the edge of the inlet.
17. The fan of claim 13 , wherein the motor is a low voltage direct current motor with an input voltage of less than 60V and an output power of less than 0.5 Watt.
18. The fan of claim 13 , wherein the flange extends outwardly from the edge of the inlet.
19. The fan of claim 13 , wherein the flange extends inwardly from the edge of the inlet towards the impeller.
20. The fan of claim 13 , wherein the flange extends from the edge of the inlet on both axial sides of the cover.
21. The fan according to claim 20 , wherein an inner diameter of the flange gradually decreases in a direction from the edge of the inlet towards the impeller.
22. The fan according to claim 13 , wherein the flange has an axial length L that is greater than 2 mm.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410013176.0A CN104776040A (en) | 2014-01-10 | 2014-01-10 | Air exhauster for dish washing machine and dish washing machine with air exhauster |
CN201410013161.4 | 2014-01-10 | ||
CN201410013176.0 | 2014-01-10 | ||
CN201410013161 | 2014-01-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150196188A1 true US20150196188A1 (en) | 2015-07-16 |
Family
ID=53485079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/593,339 Abandoned US20150196188A1 (en) | 2014-01-10 | 2015-01-09 | Dishwasher and fan |
Country Status (2)
Country | Link |
---|---|
US (1) | US20150196188A1 (en) |
DE (1) | DE102015100021A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3324815A4 (en) * | 2015-07-24 | 2019-05-08 | LG Electronics Inc. | Dishwasher |
CN110546388A (en) * | 2017-01-20 | 2019-12-06 | 皮尔伯格有限责任公司 | Fan for internal combustion engine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4295675A (en) * | 1980-02-26 | 1981-10-20 | Niskin Shale J | Cover for port light |
US5209639A (en) * | 1990-08-10 | 1993-05-11 | Kt Kunststofftechnik Gmbh | Radial fan with an axial housing |
US20070068561A1 (en) * | 2004-08-16 | 2007-03-29 | Shin Kap S | Dish washer and blower cover thereof |
US20070102026A1 (en) * | 2005-05-31 | 2007-05-10 | Lg Electronics Inc. | Dishwasher and controlling method thereof |
US20110165002A1 (en) * | 2008-09-04 | 2011-07-07 | Haiku Design Sdh Bhd | Ceiling fan |
-
2015
- 2015-01-05 DE DE102015100021.0A patent/DE102015100021A1/en not_active Withdrawn
- 2015-01-09 US US14/593,339 patent/US20150196188A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4295675A (en) * | 1980-02-26 | 1981-10-20 | Niskin Shale J | Cover for port light |
US5209639A (en) * | 1990-08-10 | 1993-05-11 | Kt Kunststofftechnik Gmbh | Radial fan with an axial housing |
US20070068561A1 (en) * | 2004-08-16 | 2007-03-29 | Shin Kap S | Dish washer and blower cover thereof |
US20070102026A1 (en) * | 2005-05-31 | 2007-05-10 | Lg Electronics Inc. | Dishwasher and controlling method thereof |
US20110165002A1 (en) * | 2008-09-04 | 2011-07-07 | Haiku Design Sdh Bhd | Ceiling fan |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3324815A4 (en) * | 2015-07-24 | 2019-05-08 | LG Electronics Inc. | Dishwasher |
US10588482B2 (en) | 2015-07-24 | 2020-03-17 | Lg Electronics Inc. | Dishwasher |
CN110546388A (en) * | 2017-01-20 | 2019-12-06 | 皮尔伯格有限责任公司 | Fan for internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
DE102015100021A1 (en) | 2015-07-16 |
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Owner name: JOHNSON ELECTRIC S.A., SWITZERLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LI, MIN;CHONG, KOK ANG;XIE, XIAO BO;AND OTHERS;REEL/FRAME:034735/0940 Effective date: 20141208 |
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