JP4106077B2 - Pump and dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump in which two pump chambers are arranged up and down and provided with forward and reverse impellers.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, two pumps used in a dishwasher are provided to satisfy two functions of circulating washing water in the apparatus to wash dishes and rinsing, and draining waste water after washing to the outside. The pump was used.
[0003]
Recently, however, two types of impellers, one or two water intakes and two discharge ports are provided in a single pump, and the two types of impellers are selectively used according to the forward or reverse rotation of the motor. A type of pump that draws cleaning water or sewage from one water inlet into the pump and discharges cleaning water or sewage from the other outlet has come to be used.
[0004]
An example of a pump incorporating two types of pumps will be described with reference to a partial sectional view of the pump shown in FIG.
[0005]
The pump has a configuration in which a motor part is arranged at the upper part and a pump part is arranged at the lower part. And the outer shell of the pump part consists of two casings, and two pump chambers are formed above and below by horizontally providing a partition plate therein. The upper pump chamber is a normal rotation (washing) pump chamber, and a normal rotation impeller is provided at this location. The lower pump chamber is a reverse (drainage) pump chamber, and a reverse impeller is provided at this location.
[0006]
In addition, a water suction port is provided below the center of the impeller, and a reverse rotation water suction port is provided in the vicinity of the outer periphery of the reverse rotation impeller.
[0007]
This type of vertical pump is disclosed in “Pump and Dishwashing” recently filed by the Company. (Patent Document 1)
[0008]
[Patent Document 1]
Japanese Patent Application No. 2002-66046
[Problems to be solved by the invention]
The pump configured as described above, when in a washing mode for tableware or the like, draws wash water from the normal / reverse suction port provided below the shaft center by the rotation of the forward impeller, and the normal rotation pump It is configured such that water passes through the chamber and is fed from the normal discharge outlet.
[0010]
At this time, since the drainage impeller is also held by the motor shaft, it rotates at the same time, and a negative pressure is generated at the discharge outlet for drainage. For this reason, when this pump is incorporated into a dishwashing set and the washing mode is set, air is sucked from the drainage side.
[0011]
This invention is made | formed in view of such a situation, and makes it a subject to provide the pump which does not inhale air from a discharge side and does not generate | occur | produce a suction sound.
[0012]
The invention of claim 1 comprises a motor part arranged in the upper part and a pump part arranged in the lower part, and the inside of the pump part is partitioned vertically by a single partition plate, and a normal rotation pump chamber located in the upper part, The two pump chambers are provided with two impellers, a forward impeller and a reverse impeller connected to the rotating shaft of the rotor, in each of the two pump chambers. The forward pump chamber has a forward discharge port that opens upward, the reverse pump chamber has a reverse discharge port, and on the rotational axis, Opening and having a water suction port connected from the reverse pump chamber to the forward pump chamber, the partition plate has a passage hole for fluid to flow into the forward pump chamber, and the forward rotation of the impeller The fluid flowing in from the water suction port is used for normal rotation via the normal rotation pump chamber. Sent to the outlet, by the reverse rotation of the impeller, the pump sending the reverse ejection outlet through the inlet fluid is the reverse pump chamber from the intake Mizuguchi, through-holes other than the passage hole in the partition plate is reversed provided on the outer peripheral portion near the use impeller, at the time of forward rotation is a pump, characterized in that reflux fluid downward from above the through hole.
[0013]
By adopting such a configuration, air is not sucked from the discharge port, and suction noise is eliminated, thus solving the problem.
[001 4 ]
The invention according to claim 2 is a dishwasher using the pump according to claim 1.
[001 5 ]
By using the pump according to claim 1 for dishwashing, air is not sucked from the discharge port when washing dishes, and the suction sound is eliminated, thus solving the problem.
[001 6 ]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a partial longitudinal sectional view of a pump 1 according to the embodiment, and FIG. 2 is an enlarged view of a through hole portion. The pump 1 is roughly composed of a motor unit 2 and a pump unit 3. The pump section 3 has a pump chamber formed by a casing (A) 10 and a casing (B) 11, and the inside of the pump chamber is partitioned into two upper and lower chambers by a partition plate 12. The upper part of this chamber is a forward pump chamber 8 and the lower part is a reverse pump chamber 9. The two casings 10 and 11 are fastened with screws with an O-ring 13 interposed therebetween to ensure waterproofness.
[001 7 ]
In this pump section 3, a Hughal-type forward rotation impeller (washing impeller) 15 connected to a rotor rotation shaft 14 is disposed in the forward rotation pump chamber 8, and the partition plate 12 is sandwiched therebetween. A Wesco-type reverse rotation impeller (drainage impeller) 16 connected coaxially to the rotary shaft 14 is disposed in the reverse rotation pump chamber 9 at the lower portion.
[001 8 ]
The forward rotation pump chamber 8 has a forward / reverse water intake port 4 that opens downward at the bottom of the pump portion on the rotation axis, and is reverse to the washing water passage hole 17 provided near the center of the partition plate 12. A flow path communicating from the forward / reverse water intake 4 to the forward pump chamber 8 is formed through a wash water through-hole 18 provided in the impeller 16, and the forward discharge outlet 6 A flow path bent from the diversion pump chamber 8 by approximately 90 degrees is formed.
[00 19 ]
The reverse pump chamber 9 has a reverse water inlet 5 and a forward / reverse water inlet 4 that open downward at the bottom of the pump unit 3, and reverses the wash water flowing from the two water inlets 4, 5. A flow path for supplying water to the reversing discharge port 7 through the reversing pump chamber 9 is formed by a discharging action caused by the rotation of the impeller 16.
[002 0 ]
In the pump 1, a rotating magnetic field is generated by energization of the motor unit 2 and the rotor is driven. The rotation of the impeller connected to the rotor shaft 14 sucks liquid and performs a water supply operation. During normal rotation of the rotor, a forward impeller (washing impeller) 15 acts, and the wash water sucked from the forward / reverse suction port 4 passes through the through hole 18 and the partition plate 12 of the reverse impeller 16. Then, it passes through the passage hole 17 formed in the front and flows into the forward rotation pump chamber 8, and a swirling flow is generated in the pump chamber by the centrifugal action of the Hughal impeller and discharged from the discharge port.
[002 1 ]
At the time of reverse rotation, the reverse impeller (drainage impeller) 16 rotates, so that washing water is absorbed from the forward / reverse water intake 4 and the reverse water intake 5, and passes through the reverse pump chamber 9 to be reversely rotated. Water is discharged to the discharge port 7 and discharged outside the machine.
[002 2 ]
In such a configuration, at the time of forward rotation, the fluid sucked from the forward / reverse rotation suction port 4 flows through the flow path by the suction action of the forward rotation impeller 15 and flows into the reverse rotation pump chamber by the water force. There is nothing.
[002 3 ]
Accordingly, when the return hole is not formed in the partition plate 12, the reverse pump chamber 9 becomes negative pressure in forward rotation, and a suction sound is generated when air is sucked from the reverse discharge port 7.
[002 4 ]
As a means for solving this noise, as in the present invention, by providing the through-hole 19 in the partition plate 12, the washing water from the normal rotation pump chamber 8 toward the normal rotation discharge port 6 during normal rotation (during washing). A part of the gas returns to the reverse rotation pump chamber 9 through the through hole 19. In other words, a part of the washing water returns from the positive pressure side (forward pump chamber) to the negative pressure side (reverse pump chamber).
[002 5 ]
As a result, the pump characteristic hardly changed and the reverse pump chamber was eliminated from becoming a negative pressure, and the problem of the suction sound was solved.
[002 6 ]
Although one through hole 19 is provided here, a plurality of through holes may be provided. Further, although two water inlets are described, only one water inlet may be used. Furthermore, in the embodiment, the water inlet of the central part is configured to be sucked at both the normal rotation and the reverse rotation, but may be configured to suck only at the normal rotation.
[002 7 ]
In addition, this pump may be used for uses other than dishwashing, for example, the use to a washing machine etc. is also considered.
[002 8 ]
【The invention's effect】
In the pump of the present invention, by providing a new hole other than the suction hole on the partition plate, water flows into the pump chamber for reverse rotation from this point, so the negative pressure is eliminated and the air suction sound is eliminated. It was done. By using this for dishwashing, abnormal noise generated during washing was eliminated.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a pump according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a through hole portion of FIG.
FIG. 3 is a partial sectional view of a conventional pump.
[Explanation of symbols]
1.31. Pump 2.32. Motor unit 3.33. Pump section 4.34. Forward / reverse water inlet 5.35. Reverse water intake port 6.36. Forward outlet 7.37. Reverse outlet 8.38. Forward pump chamber 9.39. Reverse pump chamber 10.40. Casing A
11.41. Casing B
12.42. Partition plate 13. O-ring 14. Rotation shaft 15.45. Forward impeller (washing impeller)
16.46. Reversing impeller (drainage)
17.47. Through hole 18.48. Through hole 19. Through hole

Claims (2)

It consists of a motor part arranged in the upper part and a pump part arranged in the lower part.
The inside of the pump part is partitioned up and down by one partition plate, and consists of a forward pump chamber located in the upper part and a reverse pump chamber located in the lower part,
In these two pump chambers, two impellers, a forward rotation impeller and a reverse rotation impeller connected to the rotation shaft of the rotor, are arranged laterally in each pump chamber,
The normal rotation pump chamber has a normal discharge outlet opening upward ,
The reverse pump chamber has a reverse discharge port,
On the axis of rotation, there is a water inlet that opens downward and leads from the pump chamber for reverse rotation to the pump chamber for forward rotation,
The partition plate has a passage hole for fluid to flow into the forward pump chamber,
By the forward rotation of the impeller, the fluid flowing in from the water suction port is sent to the forward discharge port via the forward pump chamber,
The reversal of the impeller, the fluid flowing from the suction Mizuguchi is in the pump to send the reverse ejection outlet via said reversing pump chamber,
A pump characterized in that a through hole other than the through hole is provided in the partition plate in the vicinity of the outer peripheral portion of the reversing impeller, and fluid is recirculated downward from above the through hole during forward rotation . A dishwasher using the pump according to claim 1.

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