KR100216722B1 - Dishwasher - Google Patents

Abstract

The leakage of water from the washing pump chamber side to the drain pump chamber side is prevented.

Sealing by labyrinth coupling using irregularities is performed between the cleaning impeller 41 and the partition 40 and between the drainage impeller 42 and the partition 40. For this reason, the flow resistance of the flow path from the outer peripheral side of the cleaning impeller 41 to the outer peripheral side of the drain impeller 42 through the through hole 40e of the partition 40 becomes very large. As a result, even when the washing washing impeller 41 is rotated, leakage of water from the washing pump chamber side passing through the through valve 40e to the drain pump chamber side can be almost eliminated.

Description

Dishwasher

The present invention relates to a dishwasher.

The dishwasher supplies water from a water supply source to a washing chamber containing dishware, sends the water stored in the washing chamber to the washing nozzle by a washing pump, and sprays water onto the dishware from the washing nozzle to wash and rinse the dishes. It consists of a structure to perform.

4 is a longitudinal sectional view showing a schematic configuration of a general dish washing machine. Inside the frame 1, a washing chamber (which also serves as a drying chamber) 2 is arranged, and a dish basket (not shown) in which tableware is placed is accommodated therein. In the front opening of the cleaning chamber 2, the door 3, which is journaled at its lower end, is provided to open in the forward direction. The rotatable nozzle arm 4 is provided in the center of the bottom part of the washing | cleaning chamber 2, and the blowing hole 5 is formed in the upper surface at predetermined angle. A water tank 6 provided with a circulation port 7 and a drain port 8 is disposed in front of the bottom of the washing chamber 2, and a filter 9 for removing food wastes from the dishes is disposed on the upper surface of the water tank 6. ) Is installed.

At the outer bottom of the washing chamber 2, a washing and drain pump 10 is disposed. At the time of washing, water sucked from the circulation port 7 of the water storage tank 6 is discharged to the nozzle arm 4, and at the time of draining, The water sucked from the drain port 8 of the reservoir 6 is discharged to the outside through the drain hose 11. In the lower part of the rear wall of the washing | cleaning chamber 2, the water level detection chamber 12 provided with the float (not shown) for detecting the water level in the washing | cleaning chamber 2 is arrange | positioned, and is supplied from the outside via the water supply valve 13 The purified water flows into the washing chamber 2 side after flowing into the water level detection chamber 12 once. Moreover, the loop type sheath heater 14 for heating the washing water and the rinsing water from the vicinity of the center of the bottom of the washing chamber 2 to the rear and raising the air temperature in the washing chamber 2 is provided.

In the dish washing machine as described above, a specific example of the conventional washing and draining pump 10 is disclosed in Utility Model Publication No. Hei 3-46709. Fig. 5 is a side longitudinal sectional view (a) and a front view (b) showing the structure of the main part of the cleaning and drainage pump 10. The cleaning and drainage pump 10 includes a pump motor 20 capable of rotationally driving in a forward and reverse direction, a cleaning impeller 21 attached to a rotating shaft 20a of the pump motor 20, and a cleaning impeller 21. It consists of a washing pump casing 22 incorporating the inside, a drain impeller 23 attached to the rotating shaft 20a of the pump motor 20, and a drain pump casing 24 incorporating the drain impeller 23. The cleaning pump casing 22 and the drain pump casing 24 are partitioned off by the partition wall 25, and the rotation shaft 20a of the pump motor 20 passes through the partition wall 25. In the cleaning pump casing 22, a suction port 26 connected to the circulation port 7 of the reservoir 6 is provided on the front surface of the cleaning impeller 21, and the nozzle arm 4 is provided on the upper surface of the peripheral wall. The first discharge port 27 is connected to the. In addition, a second discharge port 28 is provided at the lower edge portion of the front wall. On the other hand, the side wall surface of the drain pump casing 24 is provided with a drain suction port 28 leading to the drain port 8 of the reservoir 6 and a drain discharge port 30 leading to the drain hose 11.

At the time of washing | cleaning, when the washing impeller 21 is rotated to a predetermined direction by the drive of the pump motor 20, the water of the reservoir 6 will be sucked in the washing pump casing 22 via the suction port 26, It extrudes from the discharge port 27 to the nozzle arm 4 with a strong discharge pressure. At the time of drainage, the rotation of the pump motor 20 is reversed to operate the drainage pump, the water of the reservoir 6 is sucked into the drainage pump casing 24 from the drainage inlet 29, and the drain hose from the drainage outlet 30. Send to (11). At this time, the water contained in the lower part of the washing pump casing 22 is also discharged from the second discharge port 28.

In the dish washing machine as described above, it is possible to perform both the washing and the drainage as the only pump motor 20, and the cost can be reduced and the space can be saved. However, in such a conventional dishwasher, since the rotating shaft 20a penetrates the partition 25 partitioning the cleaning pump casing 22 and the drain pump casing 24, the through hole 25a of the partition 25 and There exists a possibility that water may leak from the clearance gap between the rotating shafts 20a of the pump motor 20. In particular, when the ejection hole 5 of the nozzle arm 4 is blocked and the flow of water from the first discharge port 27 to the nozzle arm 4 is stagnated, leakage of water from the cleaning pump casing 22 to the drain pump casing 24 is caused. This is so frequent that water cannot be used effectively.

This invention is made | formed in order to solve the said subject, The objective is to provide the dishwasher which can utilize water effectively by improving the liquid tightness between a cleaning casing and a drain casing, and preventing water leakage.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal cross-sectional view showing the main part structure of a washing | cleaning and drain pump in the Example of the dishwasher of this invention.

2 is a front view (a) and a cross-sectional view (b) which show the structure of the cleaning impeller of this cleaning and drainage pump.

3 is a front view (a) and a cross-sectional view (b) which show the structure of the impeller for drainage of this washing | cleaning and drain pump.

4 is a longitudinal sectional view showing an overall configuration of a general dish washer.

Fig. 5 is a side longitudinal sectional view (a) and a front view (b) showing the main parts of a conventional cleaning and drainage pump.

* Explanation of symbols for the main parts of the drawings

20: pump motor 20a: rotating shaft

22: cleaning pump casing 24: drain pump casing

40: partition 40a: ridge

40b: convex portion 40c: concave portion

40d: recess 40e: through hole

41: impeller for cleaning 41a: main body

41b: Boss 41c: Bain

41d: convex 42: drain impeller

42a: body 42b: boss

42c: vane 42d: recessed portion

In the dishwasher according to the first aspect of the present invention, there is provided a dishwasher including a pumping mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition wall on a motor shaft passing through the partition wall. The recesses and projections which are loosely fitted in the non-contact state on the surfaces facing the impeller and the partition walls are formed around the through portion of the motor shaft, and both are sealed by labyrinth coupling.

In the dishwasher, a concave-convex portion that is loosely fitted in a non-contact state to a surface facing each of the drain impeller and the partition wall is formed around the through portion of the motor shaft, and the drain impeller and the partition wall are formed on the drain pump side. It is more preferable to seal by labyrinth bond.

The dishwasher according to the second invention made to solve the above problems is a dishwasher comprising a pump mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition wall on a motor shaft passing through the partition wall. In the dishwasher which has a vane around the disc and functions as a vortex pump at the time of rotation, the uneven part loosely fitted in the non-contact state to the surface which opposes each said impeller for drainage and the said partition wall is formed around the penetration part of the said motor shaft, And both are sealed by a labyrinth bond.

The dishwasher according to the third aspect of the present invention is a dishwasher provided with a pump mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition wall on a motor shaft passing through the partition wall. The dishwasher which has a vane around a disk and functions as a vortex pump at the time of rotation, WHEREIN: It is formed by raising a part of the said partition so that the said partition and the drainage impeller surface facing the said partition may adjoin.

In the dish washing machine according to the third aspect of the present invention, the wall surface of the partition wall which does not face the vane of the drain impeller is raised for the reason described below, and the channel is narrowed on the inner circumferential side while securing a wide water path near the vane of the drain impeller. It is preferable to set it as.

Further, when the inner circumferential side of the raised portion of the partition wall and the drainage impeller are formed on the surface opposite to the partition wall surface to form a concave-convex portion that is loosely fitted in a non-contact state, and both are sealed by labyrinth coupling, it is more effective. to be.

Moreover, you may make it form the annular recessed part which surrounds the penetrating part of a motor shaft in the front-end | tip part of the said convex part of the said partition or drainage impeller.

Moreover, in the wall surface which opposes the washing | cleaning impeller of the said partition, convex annular recessed part is formed in the protruding part on the said drainage impeller side, and the convex which loosely fitted in the recessed part of the said partition by the said washing impeller was not loosely contacted. A part may be formed and both may be sealed by a labyrinth bond.

In the dish washing machine according to the first aspect of the invention, for example, an annular convex portion is formed on a surface facing the partition wall of the washing impeller so as to surround the through portion of the motor shaft, and an annular recess corresponding to the convex portion is formed on the partition wall. . The convex portions and the concave portions are kept at a slight interval within a range not in contact so as to prevent rotation of the cleaning impeller. As a result, a narrow flow path is formed between the cleaning impeller and the partition wall, through which water that enters is difficult to pass. Since the flow resistance of this flow path is large, even when the cleaning impeller is rotated, water pressure is hardly transmitted from the outer peripheral side of the cleaning impeller to the through portion of the motor shaft, and from the cleaning pump side passing through the gap between the through holes of the partition to the drainage pump side. The leakage of water almost disappears.

In addition, when the condensation seal is formed by the labyrinth coupling using the unevenness on the drain pump side, the flow resistance of the water leaking out to the drain pump side increases, so that water leakage can be further suppressed.

In the dishwasher which concerns on 2nd invention, an annular convex part is formed in the surface which opposes the drainage impeller of a partition, for example so that the perforated part of a motor shaft may be formed, and an annular concave part corresponding to this convex part is formed in the drain impeller. Is formed. The convex portion and the concave portion are maintained at a slight interval within the range not contacted so as to prevent rotation of the drain impeller. As a result, a narrow flow path is formed between the drainage impeller and the partition wall, through which water that enters is difficult to pass. Since the flow resistance of this flow path is large, even if the cleaning impeller is rotated, water pressure is hardly transmitted from the inner circumferential side (through part of the motor shaft) of the drain impeller to the outer circumferential side (near the vanes), and the gap between the through holes of the partition wall is difficult. The leakage of water from the washing pump side through the drainage pump side almost disappears.

In the dishwasher according to the third aspect of the invention, vanes are formed only in the peripheral portion of the impeller for drainage, and do not contribute to the pumping action on the inner circumferential side near the rotational axis. Thus, the flow path between the drainage impeller and the partition wall is narrowed by the configuration in which the partition wall is proximate to the drainage impeller while maintaining a gap that does not contact the rotation of the drain impeller so as not to interfere. As a result, the flow resistance of this flow path becomes large, and even when the washing impeller is rotated, water pressure is hardly transmitted from the inner circumferential side to the outer circumferential side of the drain impeller even in the case of the dish washing machine according to the second invention. The leakage of water from the washing pump side passing through the drainage pump side can be suppressed.

In the pump as described above, if the water flow path is not sufficiently secured in the vicinity of the vane of the drain impeller, the drainage performance of the drain pump decreases when the drain impeller rotates. Therefore, if the bulkhead is raised in the direction of the drain impeller only on the inner circumferential side of the drain impeller, and it is difficult to pass water from the inner circumferential side that does not contribute to the drainage performance while securing a wide flow path near the vanes, the drainage performance is not impaired. The leakage of water can be suppressed.

In addition, since the inner circumferential side of the drain impeller does not contribute to the pumping action, for example, if a recess is formed on the inner circumferential side of the drain impeller, a seal is formed by labyrinth coupling between the convex portions provided on the opposite partitions. The flow resistance of the gap between the partition wall and the drainage impeller is further increased, and water leakage can be made extremely small. Conversely, the convex part is formed in the inner peripheral side of the impeller for drainage, and it is the same also if it forms the seal by labyrinth coupling between the recessed parts provided in the opposing partition.

If a concave portion is formed in the convex portion of the partition wall or the drainage impeller, the flow of water becomes difficult at this portion, so that the pressure transmission becomes difficult. As a result, the effect of further suppressing leakage of water is achieved.

In addition, by using a ridge projecting the partition wall in the direction of the drain impeller, and forming a concave portion on the rear surface side thereof to form a labyrinth coupling between the cleaning impellers, the inner circumferential side (motor rotation axis direction) from the outer circumferential side of the cleaning impeller The flow resistance of the flow path subsequent to becomes large. As a result, the performance of any of the pumps during cleaning and drainage does not deteriorate, and moreover, water leakage can be almost eliminated from the cleaning pump side to the drainage pump side without enormous manufacturing difficulties.

Hereinafter, an embodiment of the dish washing machine of the present invention will be described with reference to FIGS. 1 is a longitudinal cross-sectional view showing the main configuration of the cleaning and drainage pump according to the present embodiment, FIG. 2 is a front view (a) and a cross-sectional view (b) of the cleaning impeller, and FIG. And sectional view (b).

In this washing and draining pump 10, the washing impeller 41 protrudes from the disk-shaped main body 41a that curves from the outer circumferential side toward the center and the main body 41a, as shown in FIG. It consists of the boss 41b which has the through-hole of a motor shaft in the center, the vane 41c provided in the spiral at the front surface of the main body 41a, and the convex part 41d formed in the circumference at the back of the main body 41a. . When this washing impeller 41 rotates in a predetermined direction, it functions as a vortex pump which extrudes the water sucked from the front part of the center part to the outer peripheral side.

On the other hand, as shown in Fig. 3, the drain impeller 42 has a flat disc-shaped main body 42a, a boss 42b protruding from the main body 42a and having a through hole of a motor shaft in the center thereof, and a main body ( 42a) A plurality of vanes 42c provided radially around the front face and a recess 42d annularly formed around the boss 42b of the front face of the main body 42a. When this drain impeller 42 rotates in a predetermined direction, it functions as a vortex pump which extrudes the water suctioned from the side to the isolated side along the outer periphery.

In the partition 40 which partitions the cleaning pump casing 22 and the drain pump casing 24, as shown in FIG. 1, the ridge 40a which is raised so as to be close to the main body 42a of the drain impeller 42 is shown. Formed. Since the ridge 40a is formed on the inner circumferential side of the vanes 42c of the draining impeller 42, the flow path around the vanes 42c is wider, and the vanes (at the time of rotation of the draining impeller 42) It does not affect pump performance caused by 42c). Moreover, the convex part 40b which protrudes to the recessed part 42d of the drainage impeller 42 is formed in the inner peripheral side of the ridge part 40a, and the convex part 40b has the concave part 40c which dug out to annular form. ) Is formed. That is, the convex part 40b of the cross-section C shape which protrudes from the inner peripheral side of the ridge part 40a which adjoins the main body 42a of the drainage impeller 42 is the wall surface of the recessed part 42d of the drainage impeller 42. It is loosely inserted at proper intervals.

On the other hand, on the wall surface on the side of the cleaning pump casing 22 which is the opposite surface of the partition 40, the drain pump casing 24 is located on the outer circumferential side of the ridge 40a, that is, on the outside of the portion where the convex portion 40b is formed. The annular recessed part 40b which dug to the side) is formed. The convex part 41d provided in the washing impeller 41 mentioned above is made to fit loosely in the non-contact state to the recessed part 40d of this partition 40. As shown in FIG. The gap between the convex portion 41d of the cleaning impeller 41 and the recessed portion 40d of the partition 40 is preferably narrowed so as not to prevent the rotation of the cleaning impeller 41.

As described above, in the cleaning and drainage pump 10, the labyrinth coupling is performed by loosely inserting the recesses and the convex portions between the drainage impeller 42 and the partition 40 and between the cleaning impeller 41 and the partition 40, respectively. By forming a seal.

In the above configuration, when the rotary shaft 20a of the pump motor 20 rotates at the time of washing, the washing impeller 41 fixed thereto rotates, and the pump of the washing impeller 41 front vane 41c is rotated. By the action, water is sucked into the cleaning pump casing 22 via the suction port 26 and discharged from the discharge port 27 provided on the side wall surface. At this time, a part of the water returns to the rear surface of the cleaning impeller 41 by the water pressure, but the narrow portion formed by the convex portion 41d of the cleaning impeller 41 and the recessed portion 40d of the partition wall 40. Flow resistance of labyrinth seal part is large, and water is hard to pass. For this reason, water pressure is hardly transmitted to the through-hole 40e direction of the partition 40 of the inner peripheral side from the outer peripheral side of the washing impeller 41, and this through-hole 40e and the rotating shaft 20a (this embodiment) Exactly, only a small amount of water leaks from the cleaning pump casing 22 to the drain pump casing 24 through the gap between the outer circumferential wall surface of the boss 42b of the drain impeller 42 and the gap.

On the other hand, the water leaked through the gap between the through hole 40e of the partition 40 and the rotation shaft 20a in the drain pump casing 24 is formed by the recess 42b and the partition wall of the drain impeller 42. Although a narrow gap between the convex portions 40b of 40 is reached, the leakage of water through the gap between the through hole 40e of the partition 40 and the rotation shaft 20a is further suppressed because the flow resistance of this portion is large. Moreover, since the space of the recessed part 40c of the partition 40 is much larger than the clearance between the recessed part 42d of the drainage impeller 42 and the convex part 40b of the partition 40, the partition 40 of the partition 40 In the concave portion 40c, turbulence of water occurs and absorbs water pressure. Therefore, the amount of water passing through this portion to the opposite surface of the main body 42a of the drainage impeller 42 and the raised portion 40a of the partition 40 is extremely small. Moreover, the clearance gap between the main body 42a of the drainage impeller 42 and the ridge 40a of the partition 40 also has a narrow sealing effect.

That is, in the configuration of the present embodiment, the double and triple seals are applied to the flow path from the inside of the washing pump casing 22 to the inside of the drain pump casing 24 so that the cleaning impeller 41 is performed as a result. The leakage of water at the time of rotation can be suppressed in a very small amount.

Moreover, when a labyrinth bond is formed in either the washing pump casing 22 or the drain pump casing 24, a sealing effect is acquired. However, as described above, a convex portion is formed on one wall surface of the partition wall 40, and a concave portion is provided on the back surface of the partition wall 40 using the convex portion, and both surfaces of the partition wall 40 are formed using the concave and convexities. When formed with a seal of labyrinth bonds, it is possible to effectively use a narrow space to ensure high liquid tightness.

In addition, the structure of the washing | cleaning and drain pump demonstrated above is an example, and it is clear that mode | mode correction and a change can be made as an aspect in accordance with the meaning of this invention.

According to the dishwasher which concerns on 1st, 2nd and 3rd invention, the water which leaks from the washing | cleaning pump side to the drainage pump side through the through-hole of a motor shaft can be reduced.

For this reason, the water circulated at the time of washing | cleaning and rinsing is not discharged | emitted on the way, and the usage-amount of water can be suppressed. In addition, when the circulating water is heated and used by a heater, if the water quantity decreases due to leakage of water, cold tap water is supplied to reduce the water temperature, and deterioration of cleaning performance or extra power for raising the water temperature is required. This shortcoming can be solved.

Moreover, according to the dishwasher which concerns on 2nd and 3rd invention especially, since it is difficult to pass water between the inner periphery of the front surface of a drain impeller which functions as a vortex pump, and a partition, it does not interfere with a drain pump action, Water leaking from the washing pump side to the drain pump side can be reduced.

Claims (8)

A dishwasher comprising a pump mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition wall on a motor shaft passing through the partition wall, wherein the washing impeller is loosely fitted in a non-contact state to each of the facing surfaces of the cleaning impeller and the partition wall. The uneven | corrugated part is formed around the perforation part of the said motor shaft, and both are sealed by labyrinth coupling, The dishwasher characterized by the above-mentioned. The convex and concave portions, which are loosely fitted in a non-contact state to the surfaces facing each of the drain impeller and the partition wall, are formed around the through portion of the motor shaft, and both are sealed by labyrinth coupling. Dishwasher. A dishwasher having a pump mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition on a motor shaft passing through the partition, wherein the drainage impeller has vanes around a disc and functions as a vortex pump at the time of rotation. A dishwasher comprising: a recessed and recessed portion that is loosely fitted in a non-contact state to a surface facing each of the drainage impeller and the partition wall, around the through portion of the motor shaft, and both are sealed by labyrinth coupling. Scrubber. A dishwasher having a pump mechanism in which cleaning impellers and drainage impellers are disposed on both sides of the partition on a motor shaft passing through the partition, wherein the drainage impeller has vanes around a disc and functions as a vortex pump at the time of rotation. A dishwasher according to claim 1, wherein a portion of the partition wall is formed to protrude so that the partition wall and a drain impeller surface facing the partition wall are close to each other. The dishwasher according to claim 4, wherein the wall surface of the partition wall not facing the vane of the drain impeller is raised, and the channel is narrowed on the inner circumferential side while securing a wide flow path of water near the vane of the drain impeller. The method according to claim 5, wherein the inner peripheral side of the raised portion of the partition wall and the drainage impeller are formed on the surface opposite to the partition wall surface so as to form a recessed and recessed portion that is loosely contacted with each other and is sealed by labyrinth coupling. A dishwasher characterized by the above-mentioned. 7. The dishwasher according to claim 6, wherein an annular recess surrounding the through portion of the motor shaft is formed at the tip of the convex portion of the partition wall or the drainage impeller. The wall surface of the partition wall facing the cleaning impeller of the partition wall, wherein a concave annular recess is formed in a raised portion on the drain impeller side, and the cleaning impeller And a convex portion that is loosely fitted in a non-contact state in the concave portion of the partition wall, and the both are sealed by labyrinth coupling.

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