JP2000014619A - Pump motor for dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump motor for a dishwasher, capable of preventing being locked as the result of foreign matter such as fine food residue generated from soiled dishes during dish washing. SOLUTION: A first clearance C1 between a corner portion 27 of a pump casing 24 and the connecting corner portion 33 of an impeller 25 is set at, e.g. about 1.7 mm, and a second clearance C2 between a horizontal wall 29 and a second wall portion 32 is set at about 1.8 mm, which is greater than the first clearance C1. A third clearance C3 formed between a vertical wall 28 and a first wall portion 31 is set to gradually increase outward from the connecting corner portion 33 connecting the first and second wall portions 31, 32 of the impeller 25 together.

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 dish washer for supplying washing water stored in a washing tank to a washing nozzle and spraying the washing water from the washing nozzle to the dish to wash the dishes. The present invention relates to a motor, and more particularly to a pump motor for a dishwasher that can prevent the pump motor from being locked due to a foreign substance such as fine food residue generated from dirty tableware during dishwashing. .

[0002]

2. Description of the Related Art Conventionally, in a dishwasher, various pump motors have been used for supplying washing water stored in a washing tank to a washing nozzle. Here, the pump motor generally has a configuration in which a pump casing is attached to a drive motor, and an impeller is fixed to a drive shaft of the drive motor in the pump casing, and the impeller is rotated by rotating the drive shaft. By rotating, the washing water is absorbed from the water inlet of the pump casing, and is supplied to the washing nozzle via the supply pipe.

Here, a conventional pump motor will be described with reference to FIGS. FIG. 5 is a schematic sectional view of a conventional pump motor. In FIG. 5, the pump motor 1
Reference numeral 00 denotes a drive motor 102 having a drive shaft 101, and a pump casing 103 is attached to a side portion (the left side portion in FIG. 5) of the drive motor 102. In the pump casing 103, an impeller 104 is fixed to the drive shaft 101, and a washing tank (not shown) of a dishwasher is provided at one end of the pump casing 103.
Is provided with a water inlet 105 which is connected to the water inlet 105. A cleaning water supply pipe (not shown) for supplying cleaning water to the cleaning nozzle is connected to the pump casing 103.

In the pump motor 100, when washing dishes, the drive motor 102 is driven to drive the drive shaft 10
1 is rotated, and the impeller 104 is also rotated. The rotation of the impeller 104 causes the cleaning water stored in the cleaning tank to be absorbed into the pump casing 103 from the water inlet 105. The washing water thus absorbed into the pump casing 3 is supplied to the washing nozzle via the washing water supply pipe. As a result, the washing water is sprayed from the washing water injection port formed in the washing nozzle to the dishes arranged above the washing tank, and the dishes are washed.

[0005]

By the way, in the washing water stored in the washing tank, foreign substances such as food scum generated from dirty tableware accompanying the washing are mixed, and most of the foreign substances are Fine foreign matter that is removed through the filter arranged on the lower surface of the cleaning tank but not removed through the filter is supplied to the suction port 105 when the pump motor 100 is driven to supply cleaning water to the cleaning nozzle. From inside the pump casing 103. The fine foreign matter that has entered the inside of the pump casing 103 may bite between the inner wall of the pump casing 103 and the impeller 104 and lock the pump motor 100 in some cases.

[0006] Such a case will be described with reference to FIG. FIG. 6 is an enlarged partial cross-sectional view showing a relationship between a pump casing and an impeller in a conventional pump motor.
In FIG. 6, a corner 106 is formed at a position near the water inlet 105 and facing the impeller 104, and a vertical wall 107 is formed upward from the corner 106, and A horizontal wall 108 is formed from 106 toward the water inlet 105. The impeller 104 is formed in a cylindrical shape so that the washing water is taken in from the water suction port 105 in the direction of arrow A according to the rotation thereof, and has an outer wall portion facing the vertical wall 107 of the pump casing 103. The second wall 1 faces the first wall 109 and the horizontal wall 108.
10, and a connection corner 111 for connecting the first wall 109 and the second wall 110 at a substantially right angle.

In the above-described conventional configuration, when the impeller 104 is rotated, the washing water is absorbed from the water inlet 105 in the direction of arrow A, but may flow backward in the pump casing 103 in the direction of arrow B. At this time, fine foreign substances that are not removed by the filter are mixed in the cleaning water,
When the cleaning water containing such foreign matter flows back in the direction of arrow B as described above, the cleaning water enters the gap between the vertical wall 107 and the first wall 109, and further flows between the horizontal wall 108 and the second wall 110. Try to get in.

Here, the gap between the horizontal wall 108 and the second wall portion 110 is provided with only a very small clearance in order to prevent the washing water from flowing back as described above. Therefore, in the case of backflow in the pump casing 103, there is a possibility that fine foreign substances contained in the washing water may be caught between the horizontal wall 108 and the second wall 110 and the pump motor 100 may be locked. , Impeller 1
It may be necessary to replace parts such as 04, or the fire may develop in some cases.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to lock a pump motor due to foreign matter such as fine food residue generated from dirty dishes during dishwashing. It is an object of the present invention to provide a pump motor for a dishwasher capable of preventing the occurrence of the problem.

[0010]

In order to achieve the above object, a dishwasher pump motor according to the present invention comprises: a washing tank;
Used in a dishwasher having a washing nozzle rotatably supported at the upper part of the washing tank, a drive motor, a pump casing attached to the drive motor, and fixed to a drive shaft of the drive motor in the pump casing. A pump formed with an impeller that is rotated according to the rotation of the drive shaft and supplies cleaning water stored in the cleaning tank to the cleaning nozzle; and a corner formed near a water inlet of the pump casing; A vertical wall continuously formed upward from the part,
A horizontal wall formed horizontally and continuously from the corner toward the water inlet; a first wall formed on the impeller facing the vertical wall; and an impeller formed on the impeller facing the horizontal wall. A second wall portion that is continuous with the first wall portion;
A connection corner connecting the wall and the second wall, wherein a first clearance between the corner of the pump casing and the connection corner of the impeller is formed to a predetermined value or more, and the horizontal The second clearance between the wall and the second wall is formed to be larger than the first clearance.

[0011] In the pump motor, when the impeller is rotated based on the rotation of the drive motor and the washing water is sucked into the inside of the pump casing from the water inlet, the washing water is
Even if a backflow occurs between the vertical wall of the pump casing and the first wall of the impeller, the first clearance between the corner of the pump casing and the connection corner of the impeller is formed to a predetermined value or more. Therefore, fine foreign substances contained in the washing water can pass between the horizontal wall and the second wall via the first clearance. Thereby, fine foreign matter does not bite between the pump casing and the impeller,
Locking of the pump motor can be reliably prevented.

Further, since the second clearance between the horizontal wall and the second wall is formed to be larger than the first clearance, fine foreign substances that have passed through the first clearance can be removed from the horizontal wall and the second wall. This prevents the pump motor from being caught between the parts and prevents the pump motor from being locked.

Here, in the pump motor, a third clearance is formed between the vertical wall and the first wall,
It is preferable that the third clearance is gradually increased by inclining outward from the connection corner. In such a case, the third clearance gradually increases outward from the connection corner connecting the first wall portion and the second wall portion of the impeller, so that relatively large foreign matter enters the third clearance. Even in such a case, such foreign matter can be dropped inside the pump casing when the rotation of the impeller is stopped, and can be discharged to the outside of the pump motor when the impeller is next rotated. Become.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a pump motor for a dishwasher according to the present invention will be described in detail with reference to the drawings based on an embodiment embodying the present invention. First, a schematic configuration of a dishwasher to which the pump motor according to the present embodiment is applied will be described with reference to FIG. FIG. 1 is a schematic side view of a dishwasher partially cut away. In FIG. 1, a dishwasher 1 is basically composed of a main body 2 of a washer and an opening / closing hood 3 which is vertically movable at an upper portion of the main body 2 of the washer.

A cleaning tank 4 is provided inside the main body 2 of the cleaning machine. A first filter 5 is disposed in a part of the washing tank 4, and the first filter 5 washes the tableware by injecting washing water from the outlets of a lower washing nozzle 15 and an upper washing nozzle 20 described below. At this time, it acts to remove relatively large foreign matter such as food waste generated from dirty tableware. A storage tank 6 for storing cleaning water is provided below the first filter 5, and a second filter 7 is disposed on a side surface of the storage tank 6. The second filter 7 has the function of removing finer foreign substances present in the cleaning water. A pump motor 8 is provided below the washing tank 4 and adjacent to the storage tank 6.
(Detailed configuration will be described later).
The water inlet 9 of the pump motor 8 and the storage tank 6 are connected by a connecting pipe 10. The front part of the washing machine main body 2 (in FIG. 1,
On the left side), a front panel 11 is attached. The front panel 11 is provided with an operation panel 12 for instructing various operations (washing operation, rinsing operation, etc.) of the dishwasher 1. . A leg member 13 is attached to the lower surface of the main body 2 of the cleaning machine.

The opening / closing hood 3 constitutes a washing chamber 14 in cooperation with the washing tank 4 of the washing machine main body 2, and is vertically moved with respect to the washing machine main body 2 by a known lifting mechanism (not shown). It is configured to be movable. A lower cleaning nozzle 15 and a lower rinsing nozzle 16 are rotatably disposed below the cleaning chamber 14. Each of the lower washing nozzle 15 and the lower rinsing nozzle 16 is rotatably attached to a rotation support portion 17 attached to an upper end of a washing water supply pipe (not shown) connected to the pump motor 8. A branch pipe 18 extends upward from the rotation support section 17, and a rotation support section 19 is provided at an upper end of the branch pipe 18.
Is attached. An upper cleaning nozzle 20 and an upper rinsing nozzle 21 are rotatably attached to the rotation support portion 19.

In the dishwasher 1, in order to wash the dishes arranged in the washing chamber 14, the pump motor 8 is driven to wash the washing water stored in the storage tank 6 from the connecting pipe 10 and the water inlet 9. The suction water is sucked into the pump motor 8, and the suctioned washing water is supplied to the lower cleaning nozzle 15 from the cleaning water supply pipe and the rotation support part 17. 20. As a result, the washing water is sprayed onto the tableware from the ejection port of the lower washing nozzle 15 and the ejection port of the nozzle 20 on the upper line, and the dirty tableware is washed. When rinsing the dishes after washing, the same operation as described above is performed by driving a rinsing pump motor (not shown) to perform the rinsing operation of the dishes.

Next, the configuration of the pump motor 8 will be described with reference to FIG.
4 through FIG. FIG. 2 is a schematic cross-sectional view of the pump motor 8, FIG. 3 is a cross-sectional view showing an upper portion of the pump motor in an enlarged manner, and FIG. 4 is a cross-sectional view showing an enlarged lower portion of the pump motor. First, in FIG. 2, the pump motor 8 has a drive motor 23 having a drive shaft 22, and a pump casing 24 is attached to a side (left side in FIG. 2) of the drive motor 23. . In the pump casing 24, an impeller 25 is provided at an end (left end) of the drive shaft 22.
The water suction port 9 connected to the connecting pipe 10 is provided at one end (left end) of the pump casing 24 as described above. The pump casing 24 is connected to a washing water supply pipe that supplies washing water sucked from the water suction port 9 to the lower washing nozzle 15 and the upper washing nozzle 20.

Subsequently, the pump casing 24 and the impeller 2
5 will be described with reference to FIGS. 3 and 4. FIG. 3 and 4, a corner 27 of the pump casing 24 is formed at a position near the water inlet 9 and facing the impeller 25, and a vertical wall 28 extends upward from the corner 27. A horizontal wall 29 is formed from the corner 27 to the water inlet 9. The impeller 25 is formed in a cylindrical shape so that the washing water is taken in the direction of arrow A from the water suction port 9 according to the rotation thereof.
0, the first wall portion 31 facing the vertical wall 28 of the pump casing 24, the second wall portion 32 facing the horizontal wall 29, and the first wall portion 31 and the second wall portion 32 are substantially formed. A connection corner 33 that connects at right angles is provided.

Here, the corner 27 of the pump casing 24
The first clearance C1 formed between the outer wall portion 30 of the impeller 25 and the connection corner portion 33 is set to 1.2 mm or more, for example, about 1.7 mm. Also,
The second clearance C2 formed between the horizontal wall 29 and the second wall portion 32 is set to a value larger than the first clearance C1, for example, about 1.8 mm. Furthermore,
As shown in FIG. 3 and FIG. 4, the first wall 31
3 and 4 (the upper side in FIGS. 3 and 4), the inner wall is inclined inward, so that the vertical wall 28 and the first wall 31
Is set so as to gradually increase from the connection corner 33 to the outside.

In the pump motor 8, when the drive motor 23 is driven when washing dishes, the drive shaft 22 is rotated and the impeller 25 is also rotated. By the rotation of the impeller 25, the washing water stored in the washing tank 4 is supplied to the water inlet 9
From the pump casing 24. The washing water thus absorbed in the pump casing 24 is taken in the direction of arrow A in the impeller 25 and is supplied to the upper washing nozzle 15 and the lower washing nozzle 20 via a washing water supply pipe or the like. The washing water is supplied from the washing water jet formed in the upper washing nozzle 15 and the lower washing nozzle 20 by the washing tank 4.
Is sprayed on the tableware arranged above the tableware, and the tableware is washed.

At this time, fine foreign matter that is not removed by the first filter 5 and the second filter 7 is mixed in the washing water, and such washing water is mainly absorbed in the direction of arrow A from the water inlet 9. There is a case where the gas flows backward in the direction of arrow B in the pump casing 24. The washing water that has flowed back in this manner is changed from the first clearance C3 to the first clearance C.
Try to pass 1

In such a case, in the pump motor 8 of the present embodiment, the first clearance C1 between the corner 27 of the pump casing 24 and the connection corner 33 of the impeller 25 is set to, for example, about 1.7 mm. Therefore, when the impeller 25 is rotated based on the rotation of the drive motor 23 and the washing water is absorbed into the inside of the pump casing 24 from the water suction port 9, the washing water is flush with the vertical wall 28 of the pump casing 24. Even if the air flows back to the first wall 31 of the impeller 25, fine foreign matter contained in the washing water passes between the horizontal wall 29 and the second wall 32 via the first clearance C1. be able to. Thereby, fine foreign matter does not bite between the pump casing 24 and the impeller 25, and it is possible to reliably prevent the pump motor 8 from being locked.

Further, since the second clearance C2 between the horizontal wall 29 and the second wall portion 32 is set to about 1.8 mm, which is larger than the first clearance C1, the second clearance C2 passes through the first clearance C1. Fine foreign matter never gets caught between the horizontal wall 29 and the second wall portion 32, and the lock of the pump motor 8 can be prevented at this point as well.

Further, a third clearance C3 formed between the vertical wall 28 and the first wall portion 31 forms a connection corner 3 connecting the first wall portion 31 and the second wall portion 32 of the impeller 25.
Since it is set to gradually increase from 3 toward the outside, even when a relatively large foreign matter enters the third clearance C3, such foreign matter will be present in FIG. 4 when the rotation of the impeller 25 is stopped. As shown, it is possible to drop inside the pump casing 24 in the direction of the arrow C (downward), and discharge it to the outside of the pump motor 8 when the impeller 25 is rotated next time.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and modifications can be made without departing from the gist of the present invention.

[0027]

As described above, in the pump motor according to the present invention, when the impeller is rotated based on the rotation of the drive motor and the washing water is absorbed into the inside of the pump casing from the suction port, the washing water is removed. Even if the current flows backward between the vertical wall of the pump casing and the first wall of the impeller, the first clearance between the corner of the pump casing and the connecting corner of the impeller is formed to be a predetermined value or more. Therefore, fine foreign matters contained in the washing water can pass between the horizontal wall and the second wall via the first clearance. Accordingly, fine foreign matter does not bite between the pump casing and the impeller, and it is possible to reliably prevent the pump motor from locking. Also,
Since the second clearance between the horizontal wall and the second wall is formed to be larger than the first clearance, fine foreign matter that has passed through the first clearance may pass between the horizontal wall and the second wall. It does not become jammed at all, and lock of the pump motor can be prevented.

Also, a third clearance is formed between the vertical wall and the first wall portion, and the third clearance is gradually increased by inclining outward from the connection corner, so that the third clearance is gradually increased. Even if a very large foreign matter enters the third clearance, the foreign matter is
When the rotation of the impeller is stopped, it can be dropped into the inside of the pump casing, and the next time the impeller is rotated, it can be discharged to the outside of the pump motor.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a dishwasher shown partially broken away.

FIG. 2 is a schematic sectional view of a pump motor.

FIG. 3 is an enlarged sectional view showing an upper part of a pump motor.

FIG. 4 is an enlarged sectional view showing a lower portion of the pump motor.

FIG. 5 is a schematic sectional view of a conventional pump motor.

FIG. 6 is an enlarged partial sectional view showing a relationship between a pump casing and an impeller in a conventional pump motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... dishwasher, 2 ... washing machine main body, 3 ... opening / closing hood, 4 ... washing tank, 8 ... pump motor, 9
... Water suction port, 14 ... Cleaning chamber, 15 ... Lower cleaning nozzle, 20 ... Upper cleaning nozzle, 22 ... Drive shaft, 2
3 ... drive motor, 24 ... pump casing, 2
5 impeller, 27 corner, 28 vertical wall,
29 ... horizontal wall, 30 ... outer wall, 31 ... first
Wall part, 32 ... second wall part, 33 ... connection corner part, C1
... 1st clearance, C2 ... 2nd clearance, C3 ... 3rd clearance

Claims (2)

[Claims] 1. A dishwasher having a washing tank and a washing nozzle rotatably supported at an upper part of the washing tank. The dishwasher includes a drive motor, a pump casing attached to the drive motor, and a pump casing. An impeller that is fixed to the drive shaft of the drive motor and is rotated according to the rotation of the drive shaft and supplies the washing water stored in the washing tank to the washing nozzle, in the vicinity of the water inlet of the pump casing. A formed corner, a vertical wall continuously formed upward from the corner, a horizontal wall formed continuously horizontally from the corner toward the water inlet, and an impeller facing the vertical wall. A first wall portion formed, a second wall portion formed on the impeller facing the horizontal wall, and continuous with the first wall portion, and a first wall portion and a second wall facing the corner portion. And a connecting corner for connecting the A first clearance between a corner of the pump casing and a connection corner of the impeller is formed to a predetermined value or more, and a second clearance between the horizontal wall and the second wall is formed by the first clearance. A pump motor for a dishwasher characterized by being formed larger than a clearance. 2. A third clearance is formed between the vertical wall and the first wall, and the third clearance is gradually increased by inclining outward from a connection corner. The pump motor for a dishwasher according to claim 1.