JP2003290116A - Pump for dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump for a dishwasher which surely performs sealing by a simple structure for the pump which performs the switching of a plurality of discharging ports such as a pump for both of washing/water-draining, in order to eliminate the problem that, when the water-draining-discharging port side is not sufficiently sealed, washing water is simultaneously discharged to the outside of the dishwasher during washing, and troubles such as an insufficient washing due to the shortage of washing water or an abnormal overheat in the dishwasher are generated. <P>SOLUTION: This pump for the dishwasher is equipped with a casing having a suction port and the plurality of discharging ports, an impeller which is provided in the casing, a motor for rotate-driving the impeller, and a switching device which closes either one of the discharging ports from among the plurality of discharging ports by utilizing the force of a water stream in the channel in the casing being generated by the rotation of the impeller. In the pump, a body and a seal part of the switching device are integrally formed of an elastic body. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump used in a dishwasher for washing dishes and the like, for pumping wash water to a nozzle or discharging wash water out of a dishwasher.

[0002]

2. Description of the Related Art Generally, a dishwasher pump is a washing pump that pumps washing water to a nozzle to wash dishes, and a drainage pump that discharges dirty water contaminated by washing dishes to the outside of the dishwasher. Alternatively, a common washing / drainage pump or the like is used in which one pump is provided with a washing discharge port and a drainage discharge port, and the washing and drainage of the dishes are switched by performing forward and reverse rotations of the motor to switch between washing the dishes and discharging the dirty water.

FIG. 5 shows a schematic view of a conventional dishwasher pump for both washing and drainage, and FIG. 6 shows a block diagram of a conventional dishwasher. The pump of FIG. 5 includes a casing 100 having a scroll shape in plan view, and a forward / reverse rotation motor 113 capable of rotating the impeller 101 in a forward / reverse direction, and has an annular flow between the outer peripheral edge 102 of the impeller and the casing side wall 103. Road 1
04 is formed, and the impeller 101 is formed on the casing end wall 105.
A suction port 107 is formed so as to face the central opening 106, and a circulation discharge port 108 and a drainage discharge port 109 are formed on the casing side wall 103. Forward / reverse rotation motor 11
When the impeller 101 is driven to rotate counterclockwise by 3, cleaning water flows in through the suction port 107 and the circulation discharge port 1
It is discharged from 08. At this time, due to the fluid force of the wash water flowing in the annular flow path 104, the valve plate 111 is moved to the drainage outlet
The seal packing 119 which is pressed against the side wall of the casing and is attached to the side wall of the opposing casing surely seals the outflow of the washing water to the side of the discharge outlet 109. Furthermore, impeller 1
When 01 is driven to rotate clockwise, the annular flow path 104
The fluid force applied to the valve plate 111 from the wash water flowing therein rotates around the hinge portion 112, the drainage discharge port 109 is opened, and the wash water is discharged from the drainage discharge port 109.

The dishwasher pump is a dishwasher 1
It is arranged near the bottom of 14. In the above-described dishwasher pump, when washing water is circulated by the forward / reverse rotation motor 113 in the forward direction, the impeller central opening 1 is passed through the suction port 107.
The wash water that has flowed into the impeller 06 is passed between the blades 11 of the impeller 101.
5 is discharged from the impeller outer peripheral edge 102 through the annular flow path 1
It flows in 04 toward the circulation discharge port 108. Valve plate 11
The fluid force applied to the valve plate 111 causes the valve plate 111 to
9, the washing water flowing in the annular flow path 104 is discharged only from the circulation discharge port 108, and the washing nozzle 1 of the dishwasher 1
16 is sprayed and the dishes 117 are washed. When draining the wash water in which the forward / reverse rotation motor 113 rotates in the reverse direction, the wash water discharged from the outer peripheral edge 102 of the impeller has an annular flow path 10.
Flows in the direction 4 in the direction opposite to the direction of circulating the wash water. The fluid force applied to the valve plate 111 causes the valve plate 111 to rotate and the drainage outlet 1
When 09 is opened, the wash water flowing in the annular flow path 104 flows into the drain pipe 118 from the drain outlet 109 and is discharged to the outside of the dishwasher 114.

Such a cleaning / drainage common pump is disclosed in Japanese Patent Laid-Open No. 2000-33896 and Japanese Patent Laid-Open No. 11-11.
As reported in 3828, there is a type in which a switching valve is provided inside the casing and the water outlet is switched by the force of the water flow inside the casing generated by changing the rotation direction of the motor that is the driving means. By installing such a pump, the conventional washing and draining operations are performed. 2
One pump can be shared by one pump, and as a result, the space and cost of the dishwasher can be reduced.

[0006]

In the above-mentioned conventional pump for the dishwasher, the switching water provided in the casing allows the washing water to be sent to either the circulation outlet or the drainage outlet. In order to perform the switching operation, it is necessary to open the discharge port on the side for supplying the cleaning water and at the same time surely close the discharge port on the side for not supplying the cleaning water. That is, during the washing operation, the washing water is sent from the circulation outlet, but if the drainage outlet side is not sufficiently sealed, the washing water will be discharged to the outside of the dishwasher at the same time during washing. Problems such as poor cleaning and abnormal overheating in the dishwasher will occur. Similarly, during drainage operation, washing water is sent from the drainage outlet, but if the circulation outlet side is not sufficiently sealed, some of the washing water will circulate in the dishwasher cabinet, resulting in drainage efficiency. (Drainage flow rate, drainage time) will decrease, and there is concern that drainage noise may worsen due to air squealing noise and the like due to the return of some cleaning water from the circulation discharge port. Therefore, the conventional example of FIG.
JP-A-2000-33896 and JP-A-11-1138
In 28, etc., an elastic member configured as a separate member is provided on the surface of the switching valve facing the discharge port or on the wall surface of the casing near the discharge port to ensure the sealing of the discharge port. However, in the dishwasher, the washing water is washed at a high temperature close to 80 ° C for the purpose of surely and hygienically washing the dishes, so that the dishwasher pump is used in a high temperature range and It is necessary to design it on the premise that the washing water containing minute solid matter such as dirt is sent. Considering the reliability (damage or detachment) of the elastic member, the mounting structure becomes complicated, and as a result, not only the number of parts increases but also the assembly becomes complicated. In addition, since the elastic body mounting portion is complicated and the mounting surface and the like are increased, there is a concern that minute solid matter may be fixed to or retained in the gap or the like. The present invention has been made in view of the above problems,
An object of the present invention is to provide a dishwasher pump that has a simple structure and reliably seals a pump that switches a plurality of discharge ports, such as a common washing / drainage pump.

[0007]

In order to achieve the above object, the first aspect of the present invention is to provide a casing having a suction port and a plurality of discharge ports, and an impeller provided in the casing.
Switching for closing one of the plurality of discharge ports by using a motor for rotating the impeller and a force of a water flow in the casing internal flow path generated by rotation of the impeller. In the pump provided with the device, the driving body and the seal portion of the switching device are integrally formed by an elastic body. As a result, the switching valve structure can be simplified, the number of parts can be reduced, the assemblability can be improved, and the discharge port can be reliably sealed.

According to a second aspect of the present invention, in the dishwasher pump according to the first aspect, an annular protrusion is provided on the casing wall surface located at the outer peripheral edge of the discharge port provided in the casing. As a result, it becomes possible to reduce the adhesion of the minute solid matter to the seal member and to reliably seal the discharge port.

According to a third aspect of the present invention, in the dishwasher pump according to the first or second aspect, in the switching device, an annular protrusion is provided on a surface of the casing that faces the discharge port. As a result, it becomes possible to reduce the adhesion of the minute solid matter to the seal member and to reliably seal the discharge port.

According to a fourth aspect of the present invention, in the pump for the dishwasher according to the second or third aspect, a plurality of annular projections are provided on the wall surface of the casing or the surface of the switching device facing the discharge port. As a result, it is possible to prevent the deterioration of the sealing property due to the adhesion of foreign matter and improve the reliability of the sealing of the ejection port.

According to a fifth aspect of the present invention, in the dishwasher pump according to the fourth aspect, the plurality of annular projections have different heights. As a result, it is possible to reliably seal the discharge port according to the behavior of the switching valve that switches by the water flow in the casing.

[0012]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. A pump in an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The pump of FIG. 1 includes a casing 8 having a scroll shape in a plan view, and a forward / reverse rotation motor 113 capable of rotating the impeller 101 in a forward / reverse direction. A passage 104 is formed, and a central opening 1 of the impeller 101 is formed in the casing end wall 105.
06, a suction port 107 is formed, and the casing side wall 103 has a circulation discharge port 108 and a drain discharge port 109.
Are formed. Further, the rectifying table 9 is provided in the annular flow path 104.
Is formed on the bottom surface of the casing 8, and the circulation outlet 10
8 and the drainage outlet 109, a switching valve 10 is mounted at a position facing the outlet surface of the drainage outlet 109 so as to be rotatable around a switching valve rotating shaft 10a.

The impeller 101 is driven by the forward / reverse rotation motor 113.
If is driven to rotate clockwise, the cleaning water will
It flows in from 07 and tries to flow in the clockwise direction in the annular flow path 104. The switching valve 10 rotates so as to be pressed against the drain discharge port 109 side by the fluid force of the flow of washing water,
The circulation discharge port 108 is opened, and the drainage discharge port 109
The cleaning water is discharged from the circulation discharge port 108. Further, when the impeller 101 is driven to rotate counterclockwise, the switching valve 10 is switched from the wash water flowing in the annular flow passage 104.
Due to the fluid force applied to the circulation discharge port 108, the fluid is rotated so as to be pressed toward the circulation discharge port 108, the drain discharge port 109 is opened, the circulation discharge port 108 is sealed, and the cleaning water is discharged from the drain discharge port 109.

The dishwasher pump is a dishwasher 1
It is arranged near the bottom of 14. In the above-mentioned dishwasher pump, when the forward / reverse rotation motor 113 rotates in the reverse direction, the impeller central opening 1 passes through the suction port 107.
The wash water that has flowed into the impeller 06 is passed between the blades 11 of the impeller 101.
5 is discharged from the impeller outer peripheral edge 102 through the annular flow path 1
It flows in 04 toward the circulation discharge port 108. Switching valve 1
The changeover valve 10 causes the drainage discharge port 10 by the fluid force applied to 0.
9, the washing water flowing in the annular flow path 104 is discharged only from the circulation discharge port 108, and the washing nozzle 1 of the dishwasher 1
16 is sprayed and the dishes 117 are washed. When draining the wash water in which the forward / reverse rotation motor 113 normally rotates, the wash water discharged from the outer peripheral edge 102 of the impeller is supplied to the annular flow path 10.
Flows in the direction 4 in the direction opposite to the direction of circulating the wash water. The switching valve 10 is rotated by the fluid force applied to the switching valve 10, and the drainage outlet 1
When 09 is opened, the wash water flowing in the annular flow path 104 flows into the drain pipe 118 from the drain outlet 109 and is discharged to the outside of the dishwasher 114.

The switching valve structure of this embodiment will be described with reference to FIGS. The switching valve 10 includes a switching valve rotating shaft 10
a and the circulation side sealing surface 10 which seals the circulation discharge port 108 and receives the force of the water flow in the casing during the circulation discharge.
b and the drain side sealing surface 10 that seals the drain outlet 109 and receives the force of the water flow in the casing during drain discharge.
c and a rectifying table sliding surface 10d between the rectifying table 9 and a surface 10e sliding on the casing end wall 105. The circulation seal part 12 is provided on the circulation side seal surface 10b.
a and 12b, and the drain side seal surface 10c is provided with drain seal parts 13a and 13b. Circulation seal part 1
The 2a, 12b and the drain seal parts 13a, 13b are pressed against the side wall of the casing by the force of the water flow in the casing generated by the rotation of the forward / reverse rotation motor 113, thereby reliably sealing the entire circumference while deforming 103. , So as to prevent the wash water from flowing out to the respective discharge ports. In this embodiment, the circulation seal parts 12a, 12b
Although 13a and 13a are circular protrusions, they may be formed in an elliptical shape or a substantially rectangular shape depending on the shape of the casing 8 as long as the outer diameter is formed larger than the discharge ports facing each other.

In the circulation seal portions 12a and 12b and the drainage seal portions 13a and 13b, the protrusion height of 12b is higher than that of the circulation seal portion 12a, and the drainage seal portion 13 is formed.
The height of 13b is higher than that of a. This is because when the switching valve 10 is rotated around the switching valve rotating shaft 10a by the force of the water flow in the casing generated by the rotation of the forward / reverse rotation motor 113, the circulation seal portions 12a, 12b and the drain seal portion 13a, This is because, in 13b, a part of the seal portion (that is, 12b, 13b) located on the outer side comes closer to the casing wall surface 103 first. Since the sealing of the sealing portion is performed by crushing the entire circumference of the sealing portion by a certain amount or more to increase the surface (line) pressure between the elastic body and the casing side wall 103, all the protrusions have the same height. In this case, when the seal portion farthest from the switching valve rotating shaft 10a is crushed by a certain amount or more,
There arises a problem that the seal portion closest to the switching valve rotating shaft 10a is further crushed. for that reason,
In the outer seal portions 12b and 13b, the amount of deformation at the time of sealing is always different depending on the separation distance from the switching valve rotating shaft 10a. Therefore, a difference in sealing performance occurs due to deterioration of the elastic body with time, and the sealing performance is degraded Etc. is a concern. In this embodiment, the protrusion heights of 12a and 13a are 2 mm, 12b and 13a.
When the height of b is set to 1.5 mm, when the switching valve 10 rotates, 12a or 13a first seals,
After 12a and 13a are deformed by 0.5 mm or more to ensure sealing, 12b or 13b is subsequently deformed to perform sealing. 1
2a and 13a have a small difference in the separation distance from the switching valve rotating shaft 10a, and therefore have a small difference in the deformation amount.
By making the circulation side sealing surface 10b or the drain side sealing surface 10c and the casing side wall 103 substantially parallel when the 13b contacts the casing side wall 103, the large diameters 12b and 13b are also deformed over the entire circumference. The amount can be made uniform, and as a result, stable and highly accurate sealing can be performed over a long period of time.

In the configuration of the first embodiment, the plurality of seal portions are provided, but since it is expected that the dishwasher will be used in a high temperature range and that foreign matter such as fine particles will be mixed,
Even if the single seal portion deteriorates with time, or if the sealing force is lost due to the entrapment of foreign matter or the like, it is possible to reliably seal. Further, since the heights of the plurality of seal portions are made different, the deformation amount of the elastic body is made uniform, and the reliability is further improved. In this embodiment, the seal portion has a semicircular cross section, but the seal portion is the casing side wall 103.
Any shape may be used so long as it makes line contact with or surface contact with, and may be formed in a triangular shape or a thin trumpet shape.

The switching valve 10 is integrally formed of an elastic body. By using the elastic body as an elastomer, the switching valve rotating shaft 10a, which is the driving body, and the circulation-side sealing surface 10
b, the drain side sealing surface 10c, the rectifying table sliding surface 10d, the casing end wall sliding surface 10e, etc. are made to have a hardness equivalent to that of resin, and the circulation sealing portions 12a, 12b and the drain sealing portion 13a. , 13b can be made relatively low in hardness to have elasticity, and the strength of the driving body can be increased to prevent deformation of the switching valve 10 itself and to further ensure sealing performance. . Further, in consideration of impact resistance, reliability can be improved by forming only the switching valve rotating shaft 10a with a metal part and integrally molding the switching valve 10 when molding the switching valve 10.

FIGS. 4A and 4B show the construction of the casing and the switching valve in the second embodiment of this embodiment. The switching valve 10 seals the switching valve rotating shaft 10a, the circulation discharge port 108, and seals the circulation side sealing surface 10b that receives the force of the water flow in the casing at the time of circulation discharge, and the drainage discharge port 109, and at the time of drainage discharge the casing. It is composed of a drain side sealing surface 10c that receives the force of the water flow inside, a rectifying table sliding surface 10d between the rectifying table 9 and a surface 10e that slides on the casing end wall 105. Casing side wall 10
3, drainage seal ribs 14a and 14b are provided outside the drainage outlet 109. Forward / reverse rotation motor 1
When the switching valve 10 is rotated toward the drain discharge port 109 side by the force of the water flow in the casing generated by the rotation of 13,
By pressing the drain side seal surface 10c against the casing side wall 103, the drain seal ribs 14a and 14b are formed so as to prevent the wash water from flowing out to the drain discharge port 109 and reliably seal. Drain side sealing surface 1
0c is formed in a substantially flat shape, but the drain seal rib 14
It may be formed by a convex smooth surface so as to be surely pressed against a and 14b. In addition, the drain seal ribs 14a, 14
Although b has a semicircular cross section, the sealing portion may have a shape that makes line contact or surface contact with the drain side sealing surface 10c,
A reliable seal can be achieved by using a shape such as a triangular cross section that increases the surface pressure. Also, regarding the projection height positions of the drain seal ribs 14a and 14b,
Similar to the first embodiment described in 6, the stable sealing performance can be secured by providing the drain seal rib 14b provided outside at a position lower than 14a. Further, in the second embodiment, the seal rib is provided on the side of the drainage discharge port 109, but it may be provided on the side of the circulation discharge port 108, and by forming the seal portion on the casing side, the switching valve 10 can be simple, It is possible to have a smooth structure, and it is possible to prevent sticking or adhesion of foreign matter to the minimum. Further, in such a configuration, since the thin portion or the minute protrusion of the elastic body is not required in the seal portion, the thin portion or the minute protrusion of the elastic body is deteriorated or worn due to heat of cleaning water or a contained component (chlorine). As a result, it is possible to perform stable sealing for a long period of time without worrying about deterioration of the sealing property.

[0020]

As described above, according to the present invention, in a pump for switching a plurality of discharge ports such as a common cleaning / drainage pump, the sealing property of the discharge port at the time of switching the discharge port can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a dishwasher according to a first embodiment of the present invention.

FIG. 2 is a plan view of a pump scroll according to the first embodiment of the present invention.

FIG. 3A is a scroll configuration diagram in the first embodiment of the present invention. FIG. 3B is a sectional view of a switching valve in the first embodiment of the present invention.

FIG. 4 (a) is a scroll configuration diagram in the second embodiment of the present invention.

FIG. 5: Schematic diagram of a conventional dishwasher pump for both washing and drainage

FIG. 6 is a block diagram of a conventional dishwasher

[Explanation of symbols]

1 ... Pump for dishwasher, 2 ... Straightening stand, 4 ... Washing tank, 5
... blades, 7 ... impeller rotation center, 9 ... rectifying base, 10 ... switching valve, 10a ... switching valve rotating shaft, 10b ... circulating side sealing surface,
10c ... Sealing surface on drainage side, 10d ... Sliding surface of rectifying table, 10
e ... Casing sliding surface, 12a, 12b ... Circulation seal part, 13a, 13b ... Drainage seal part, 14a, 14b ...
Drainage seal rib, 100 ... Casing, 101 ... Impeller, 102 ... Impeller outer peripheral edge, 103 ... Casing side wall,
104 ... Annular flow path, 105 ... Casing end wall, 106 ...
Central opening, 107 ... Suction port, 108 ... Circulation discharge port, 1
09 ... drainage discharge port, 110 ... flow path branching section, 111 ... valve plate, 112 ... hinged section, 113 ... forward / reverse rotation motor, 114
... Dishwasher, 115 ... Flow path between wings, 116 ... Washing nozzle, 117 ... Tableware, 118 ... Drain pipe, 119 ... Seal packing

Continued front page    (72) Inventor Hiroshi Horiuchi             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. (72) Inventor Koji Morita             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. F term (reference) 3B082 BF02 BF04 BF05                 3H034 AA01 AA13 BB01 BB06 CC03                       DD12 DD27 EE12 EE13

Claims (5)

[Claims] 1. A casing having a suction port and a plurality of discharge ports, and an impeller provided in the casing,
Switching for closing one of the plurality of discharge ports by using a motor for rotating the impeller and a force of a water flow in the casing internal flow path generated by rotation of the impeller. A pump for a dishwasher, characterized in that a switching body and a seal portion of the switching device are integrally formed of an elastic body. 2. A pump for a dishwasher according to claim 1, wherein a substantially annular protrusion is provided on a wall surface of the casing located at an outer peripheral edge of a discharge port provided in the casing. 3. The pump for a dishwasher according to claim 1, wherein in the switching device, a substantially annular protrusion is provided on a surface of the casing that faces the discharge port. 4. A pump for a dishwasher according to claim 2, wherein a plurality of substantially annular protrusions provided on the wall surface of the casing or the surface of the switching device facing the discharge port are provided. 5. The dishwasher pump according to claim 4, wherein the plurality of substantially annular protrusions have different heights.