CN109394126B - Spray arm and cleaning machine applying same - Google Patents

Spray arm and cleaning machine applying same Download PDF

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Publication number
CN109394126B
CN109394126B CN201710713871.1A CN201710713871A CN109394126B CN 109394126 B CN109394126 B CN 109394126B CN 201710713871 A CN201710713871 A CN 201710713871A CN 109394126 B CN109394126 B CN 109394126B
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China
Prior art keywords
spray arm
spray
water
flow
runner
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Active
Application number
CN201710713871.1A
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Chinese (zh)
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CN109394126A (en
Inventor
徐慧
朱灯光
茅忠群
诸永定
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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Priority to CN201710713871.1A priority Critical patent/CN109394126B/en
Publication of CN109394126A publication Critical patent/CN109394126A/en
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Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/0086In-sink dishwashers
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/14Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber
    • A47L15/16Washing or rinsing machines for crockery or tableware with stationary crockery baskets and spraying devices within the cleaning chamber with rigidly-mounted spraying devices
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/42Details
    • A47L15/4278Nozzles
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00Washing methods characterised by the use of a particular treatment
    • A47L2601/17Sonic or ultrasonic waves

Abstract

The utility model relates to a spray arm, comprising a spray arm body, wherein the spray arm body is hollow and is provided with a runner, the central part of the bottom of the spray arm body is provided with a water inlet communicated with the runner, the wall surface of the spray arm body is provided with spray holes communicated with the runner.

Description

Spray arm and cleaning machine applying same
Technical Field
The present disclosure relates to cleaning machines, and particularly to a spray arm and a cleaning machine using the same.
Background
With the increasing level of living of people, dish washers are increasingly entering home as household electrical appliances for kitchen use. The existing dish-washing machines on the market are generally divided into three types of a desk type dish-washing machine, a cabinet type dish-washing machine and a trough type dish-washing machine, wherein the desk type dish-washing machine is of an integral independent structure and is generally placed on a desk for use; the cabinet type dish washer is also an independent structure, but needs to be embedded into a kitchen cabinet for use; the tub dishwasher is combined with a tub and is generally installed in a kitchen cabinet.
The dish washing machines of the above-mentioned various forms generally achieve the cleaning effect by lifting water by a water pump and spraying the water to fruits and vegetables in a cleaning space. For example, the chinese patent with application number CN97236119.7, i.e. a microcomputer light-operated full-automatic dish washer, and the chinese patent with application number CN00240098.7, i.e. a dish washer, all disclose similar structures, in which the impact force of water flow to fruits and vegetables is weak and not uniform enough, and when fruits and vegetables are more, they cannot be covered by water flow, resulting in poor cleaning effect. The chinese patent CN200710306898.5, which relates to a dish washer, especially a household dish washer, with a device for improving decontamination effect, provides a vaporizing device for generating a fluid mist that can be introduced into a cavity of the dish washer, so as to enlarge a cleaning area of fruits and vegetables and improve uniformity of cleaning media, but the structure still cannot solve the problem of weak impact force of sprayed water flow. For this reason, the applicant has made a series of improvements to the washing machine with dish washing function, such as ZL201310749864.9 "sink-type washing machine", ZL201310750968.1 "sink-type washing machine", which uses the rotary spray arm disposed at the bottom of the sink body as the water spraying means to connect with the water pump, the water pump sucks the water in the sink body and then sprays the water from the spray arm to wash the object to be washed, and chinese application (a sink-type washing machine) such as 201610110963.6 (publication No. CN105662300 a) discloses such a whole H-type, the split flow passage includes a lateral split flow passage in the middle and vertical split flow passages at both sides, respectively, which biases the water pump at the bottom of the sink body, such as one end of the length direction of the sink body, since the water pump is smaller to the other end of the sink body or near the fruit and vegetable in the length direction of the other end, and a device for collecting the residue is easy to be added at the other end; in a fruit and vegetable washer, in order to equalize the suction force of two ends of the spray arms to fruits and vegetables, chinese patent No. CN206239254U of the applicant's ZL201621100369.0 discloses such a fruit and vegetable washer comprising two water pumps and two spray arms, wherein the flow dividing passage extends from the first end to the second end of the spray arm, the second end of one spray arm faces the first end of the other spray arm, and the direction of the nozzle of one spray arm is opposite to the direction of the nozzle of the other spray arm, so that the water streams sprayed from the two spray arms are formed into an annular rotary water stream. The two spray arms are arranged, and the direction of the spray nozzle is arranged, so that water flow sprayed by the spray holes can form annular rotary water flow, the spray arms at the two ends apply the same acting force to fruits and vegetables, so that the fruits and vegetables can rotate in a certain direction in the vegetable basket, the fruits and vegetables are in a moving state relative to the water tank body and the water flow, and the water flow can wash each surface of fruits and vegetables to be cleaned, and meanwhile, the ultrasonic generating devices are arranged at the two sides of the spray arms, so that a better cleaning effect is obtained; however, two spray arms of two water pumps are required, and therefore, further improvement is required, and meanwhile, only a single rotary spray arm is adopted to clean objects (fruits and vegetables or fruits and vegetables) to be cleaned, so that dead angles can not be washed by water flow sprayed from the rotary spray arm.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a spray arm capable of enhancing the cleaning effect of the spray arm.
Another technical problem to be solved by the present utility model is to provide a cleaning machine using the spray arm according to the above state of the art.
The technical scheme adopted for solving the technical problems is as follows: the spray arm comprises a spray arm body, wherein the spray arm body is hollow and is provided with a flow channel, the spray arm body is provided with a water inlet communicated with the flow channel at the central position of the bottom, and the wall surface of the spray arm body is provided with spray holes communicated with the flow channel.
Wherein, in order to avoid the unbalanced suction of treating the washings and the problem runner that the turbulence intensity is weak that the length of reposition of redundant personnel passageway is different that causes because of the water pump biasing causes among the current cleaning machine, the runner is located the both sides of water inlet respectively and in order to effectively strengthen and balanced rivers spray pressure that sprays arm body both ends, wherein, the runner can be:
the flow channels are radial flow channels. The radial flow channel divides the existing spray arm into smaller sub-flow channels to balance the water flow spray pressure of the flow channel;
or the flow channel is an O-shaped annular flow channel. The cross section area of the O-shaped annular flow passage is large, so that the water flow spray pressure at two ends of the spray arm can be balanced under the conditions of reducing the number of water pumps and not increasing the power of the water pumps, and the turbulence intensity is kept not weakened, so that the cleaning effect is improved.
In order to reduce the loss of kinetic energy of water by the opposite impact of the downstream distal end of the O-shaped annular flow passage, the downstream distal end of the annular flow passage is blocked by at least one blocking wall along the water flow direction.
Further, the cross-sectional area of the annular flow passage gradually decreases from upstream to downstream in the water flow direction. The sectional area of the annular flow channel is gradually reduced from the upstream to the downstream, so that the flow velocity of the water flow is large at the downstream with small sectional area, and the flow velocity of the water flow is small at the upstream with large sectional area, and according to the Bernoulli principle, the larger the flow velocity of the fluid, the smaller the pressure, the smaller the flow velocity of the fluid and the larger the pressure; therefore, the water sprayed out from the spray hole of the spray arm body can be pressed from the high pressure upstream to the low pressure downstream, and therefore the water sprayed out from the spray hole at the low pressure downstream of the spray arm body can upwards support the object to be cleaned, the object to be cleaned is in a moving state, and therefore water flow can wash each surface of the object to be cleaned, the cleaning without dead angles is achieved, a good cleaning effect is achieved, and the problems that the object to be cleaned is deposited and the positions close to dead angles on two sides of a washing cavity of a cleaning tank are easy to clean dead angles due to insufficient water flow washing force can be effectively avoided.
Further, the annular flow passage has at least three spray holes on each side of the barrier wall separation, and the distance between a spray hole adjacent to the barrier wall and the barrier wall is smaller than the distance between other adjacent spray holes. The distance between the spraying holes adjacent to the baffle wall and the baffle wall is small, so that water flow which can turn back from the baffle wall can be sprayed out of the spraying holes rapidly, so that the object to be cleaned is lifted upwards, and the deposition of the object to be cleaned is avoided.
Further, the opening directions of the other adjacent spray holes are all oriented in the same rotation direction, so that the water flow sprayed from the annular flow channel forms annular water flow. After the device is arranged, water flow sprayed out of other spraying holes can form annular rotary water flow, acting force is applied to the object to be cleaned, the object to be cleaned can rotate in a certain direction, the object to be cleaned is in a motion state, and therefore the water flow can wash each surface of the object to be cleaned, the object to be cleaned is clean without dead angles, and a good cleaning effect is achieved.
Further, the inner annular wall of the O-shaped annular flow passage forms a central hole.
Preferably, the atomization generating device is an ultrasonic atomization device.
The utility model provides a cleaning machine for solving the second technical problem, which comprises a cleaning cavity, wherein an ultrasonic generating device is arranged at the bottom of the cleaning cavity, and the ultrasonic generating device is positioned below the central hole. The ultrasonic wave generating device can emit relatively uniform ultrasonic waves, and a relatively good cleaning effect is further obtained.
Compared with the prior art, the utility model has the advantages that the atomization generating device is arranged at the upstream position of each flow channel, so that water flowing into a channel from the water inlet is atomized and bubbles can be generated, the water mixed with a large amount of bubbles is sprayed onto a cleaning object from the spray holes on the spray arm body, the instant cavitation phenomenon can be generated by cracking to form a radioactive impact force, the area and probability of directly flushing the cleaning object are increased, the cleaning speed is further increased, the existence of spray dead angles of the spray arm is effectively avoided, the cleaning rate of the spray arm is improved, the cleaning effect is effectively enhanced, the flow channels are arranged at the two sides of the water inlet, the water flow spray pressure at the two ends of the spray arm body can be effectively enhanced and balanced, the problem that the turbulence intensity is weak due to unbalanced suction force of the cleaning object and different lengths of the shunt channels caused by water pump bias is avoided, meanwhile, the cleaning machine also has a turbulent cleaning function, when the water level is higher, the turbulence mixed with the bubbles is formed, the turbulent flow formed by the water mixing with the bubbles is increased, the air-jet force generated by the turbulent flow of the bubbles, the impact force generated by the unit volume generated by the air-jet effect is effectively, the existence of the impact force is increased, the unit volume generated by the impact force and the impact force is effectively, the cleaning effect is increased, the cleaning effect is achieved, and the cleaning effect is achieved under the conditions that the cleaning effect is better or is realized, and the cleaning effect is realized.
Drawings
FIG. 1 is a schematic view of a spray arm according to a first embodiment of the present utility model;
FIG. 2 is a schematic view of a lower spray arm in accordance with an embodiment of the present utility model;
FIG. 3 is a cross-sectional view of a water tank body according to a first embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a lower spray arm in a second embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
Example 1
Referring to fig. 1 to 3, the washer of the present utility model is designed to be particularly suitable for a sink type washer having an elongated sink, particularly for washing fruits and vegetables, but may be applied to a general sink type washer, as well as a front-opening European type washer and a drawer type washer, in fact.
The following description will be made by taking a fruit and vegetable cleaning machine as an example:
the fruit and vegetable cleaning machine comprises a water tank body 100, a water pump and a spray arm, wherein the water pump is arranged at the bottom of the water tank body 100, the spray arm is used as a water outlet component of the water pump, and water pumped by the water pump is sprayed out to clean fruits and vegetables and the like to be cleaned in the water tank body 100. In the present utility model, it is preferable that the tub body 100 is formed in a long and narrow shape, thereby not only being better adapted to the space of a user's kitchen (to be matched with other tub), but also saving water with respect to a square tub.
The water pump sets up the intermediate position in basin body 100 bottom, the water pump includes motor and impeller, the impeller includes terminal hollow axle and a plurality of evenly distributed and along axially extending blade on the axle global with the output shaft of motor, wherein, the motor is located the bottom below of basin body, and the impeller is then located the bottom of basin body, in this embodiment, preferably, the water inlet of water pump is located the below (lower water inflow) of impeller, and the water inlet is corresponding with the water inlet on the spray arm, draw up the rivers from the bottom, the structure of water pump is the same with the chinese patent of applicant's application No. 201610110965.5 or chinese patent of application No. 201310752573.5 structure, and the description is omitted here. A filter screen is arranged between the lower part of the spray arm and the water pump to isolate dirt from entering the water pump and prevent the spray arm from being blocked.
The ultrasonic wave generating device 7 is arranged on two sides of the water pump of the water tank body, the drainer and the drain valve are also arranged at the bottom of the water tank body 100, and dirty water after cleaning can be discharged through the drainer and the drain valve. The washing basket is further arranged in the water tank body and used for placing fruits and vegetables to be washed, the upper end edge of the washing basket is placed on the inner side wall of the upper end of the water tank body, and the bottom of the washing basket is located above the spray arm, the ultrasonic generating device and the drainer.
In order to adopt only one water pump in the middle of the long and narrow water tank body 100, and still balance the water flow spraying pressure at the two ends of the spray arm without increasing the power of the water pump and keep the turbulence intensity not weakened, the spray arm comprises a spray arm body, the spray arm body 1 is hollow and is provided with a flow channel, the spray arm body is provided with a water inlet communicated with the flow channel at the central part of the bottom, the wall surface of the spray arm body 1 is provided with two spray holes communicated with the flow channel, the flow channels are respectively positioned at the two sides of the water inlet, and an atomization generating device is arranged at the upstream position of each flow channel and used for atomizing water introduced from the water inlet. In this embodiment, the flow channels are described by expanding the flow channels in an O-shape, and because the two flow channels have similar structures and are in a center symmetrical pattern, for convenience of description, the left flow channel is taken as an example in the following description.
The spray arm body 1 can be integrally injection molded, and can be arranged into two parts which are connected in an upper-lower split manner for reducing the difficulty in addition. Wherein, spray arm body 1 is including last spray arm 12 and lower spray arm 13, and the water inlet is established at the middle part of lower spray arm 13, and the spray hole then sets up the top surface of last spray arm 12. In addition, in order to enhance the cleaning effect, the two sides of the water pump 8 of the water tank body 100 are provided with ultrasonic generating devices 7, correspondingly, in a central hole 3 formed by the inner ring wall of the O-shaped annular flow passage of the spray arm arranged on the ultrasonic generating devices 7, one end of the spray arm body 1 inwards extends to form a baffle wall 4 propped against the outer wall of the central hole 3, the tail end of the O-shaped annular flow passage is separated by the baffle wall 4 to prevent water flow intersection and undershoot and influence water outlet pressure, the hole wall of the central hole 3 upwards extends to form an inner ring convex wall 31, a first side surface of the inner ring convex wall 31, the inner side surface of the convex wall 11 and the baffle wall 4 jointly form a first sub-flow passage 5, a second side surface of the first inner ring convex wall 31, the inner side surface of the convex wall 11 and the baffle wall 4 jointly form a second sub-flow passage 6, the spray hole comprises a first spray hole corresponding to the first flow dividing passage and a second spray hole corresponding to the second flow dividing passage, the number of the first spray holes and the second spray holes is 4 respectively, if the number is too large, the phenomenon of weakening of the spray pressure of the water flow is easy to cause, turbulence and weak spray effect are caused, if the number is too small, the spray cleaning range is easy to cause, 4 are used for unfolding and describing, namely, a spray hole I10, a spray hole II 20, a spray hole III 30 and a spray hole IV 40, a spray hole V50, a spray hole VI 60, a spray hole V70 and a spray hole V80 respectively, wherein the distance between the spray hole IV 40 and the spray hole V80 and the baffle wall 4 is smaller than the distance between other adjacent spray holes, and the spray holes V80 are inclined upwards at a certain angle with the horizontal direction, preferably 30-60 degrees, the angle of the spray hole IV 40 and the spray hole V80 is arranged to enable the water flow returning from the baffle wall 4 to be sprayed out from the tangential direction of the spray holes adjacent to the baffle wall 4, and the atomization generating device 200 is arranged at the upstream position of each flow passage, the water flowing into the channel from the water inlet is atomized and can generate bubbles, the water mixed with a large amount of bubbles is sprayed onto fruits and vegetables from the spray holes on the spray arm body 1, the bubbles can be generated, the cavitation phenomenon can be generated instantly after the bubbles are broken to form radioactive impact force, the area and probability of directly flushing the fruits and vegetables are increased, further, the cleaning speed is accelerated, the existence of spray dead angles of the spray arm is effectively avoided, the cleaning rate of the spray arm is improved, the cleaning effect is effectively enhanced, when the water level is higher, the other adjacent spray holes of the spray arm, the first spray hole 10, the second spray hole 20, the third spray hole 30 and the fifth spray hole 50, the sixth spray hole 60 and the seventh spray hole 70 are all formed with turbulence by the water mixed with the bubbles in the same rotation direction, the turbulence mixed with the bubbles can be flushed to the fruits and vegetables to be cleaned, the formed cavitation force is also increased greatly, and the impact force and friction force in the unit volume are greatly increased, and the good cleaning effect is achieved even under the condition that any surfactant or detergent is not used, and therefore the cleaning is realized in a more all directions. In addition, the cross section area of the O-shaped annular flow passage is gradually reduced from the upstream to the downstream along the water flow direction. The sectional area of the annular flow channel is gradually reduced from the upstream to the downstream, so that the flow velocity of the water flow is large at the downstream with small sectional area, and the flow velocity of the water flow is small at the upstream with large sectional area, and according to the Bernoulli principle, the larger the flow velocity of the fluid, the smaller the pressure, the smaller the flow velocity of the fluid and the larger the pressure; therefore, the water sprayed out from the spray holes of the spray arm body can be pressed from the high pressure upstream to the low pressure downstream, so that the water sprayed out from the spray holes at the lower stream of the spray arm body can be flushed out to each surface of fruits and vegetables to be cleaned, the cleaning without dead angles is achieved, a good cleaning effect is achieved, the deposition of the fruits and vegetables to be cleaned can be effectively avoided, and the problem that the dead angles are easily cleaned due to insufficient water flushing force at the positions close to the dead angles at two sides of the water tank body is avoided.
According to the water tank cleaning machine, the spray arm structure is adopted, fruits and vegetables to be cleaned are placed in the cleaning basket of the water tank body during cleaning, the atomization generating device, preferably the ultrasonic atomization device, located at the upstream of the flow channel is opened, the ultrasonic atomization device oscillates by using the ultrasonic technology with compression force and decompression force of more than tens of thousands of times/second, fine bubbles can be formed in water used for cleaning in the water tank body, the bubbles are not stopped to generate bubble implosion in rapid compression and expansion, irregular fruits and vegetables are difficult to touch, such as granular dirt in fine seams is separated from the surfaces of the fruits and vegetables, dead angles which cannot be cleaned are avoided, in addition, water flow is pumped to two side diversion flow channels by the lower spray arm 13 to ensure stable water pressure, each O-shaped annular flow channel further comprises two sub-flow channels, the spray pressure of each beam is controlled to be consistent, and the water flow is separated at the tail end of the flow channel by the baffle wall, so that the water flow is prevented from intersecting and opposite impact on the water outlet pressure. The left spray arm and the right spray arm rotate in the same direction in water, turbulence is respectively formed, and the turbulence is enhanced, so that the more omnibearing cleaning is realized, the phenomenon that the local position is not washed cleanly is avoided, and the water quantity can be saved.
Example 2
Substantially similar to the structure of example 1, the difference is that: the flow channels are radial flow channels, as shown in fig. 4, namely, the flow channels are divided into three sub-flow channels, namely, a third sub-flow channel 103, a fourth sub-flow channel 104 and a fifth sub-flow channel 105, and at least three spraying holes are formed in the wall surface corresponding to each sub-flow channel so as to control the spraying pressure of each sub-flow channel to be consistent.

Claims (10)

1. The utility model provides a spray arm, includes spray arm body, spray arm body inside cavity just is formed with the runner, spray arm body is including last spray arm and lower spray arm, lower spray arm open in bottom central part with the water inlet that the runner is linked together, and set up on the top surface of going up spray arm with the spray hole that the runner is linked together, its characterized in that the runner has two at least, is located respectively the both sides of water inlet to be provided with atomizing generating device in the upstream position of each runner, be used for making follow the water that the water inlet introduced produces the atomizing.
2. The spray arm of claim 1, wherein: the flow channels are radial flow channels.
3. The spray arm of claim 1, wherein: the flow channel is an O-shaped annular flow channel.
4. A spray arm according to claim 3, wherein: the annular flow passage is blocked at a downstream distal end by at least one blocking wall in the direction of water flow.
5. The spray arm of claim 4, wherein: the cross-sectional area of the annular flow passage gradually decreases from upstream to downstream along the water flow direction.
6. The spray arm of claim 4 or 5, wherein: the annular flow passage has at least three spray holes on each side of the baffle wall partition, and the distance between a spray hole adjacent to the baffle wall and the baffle wall is smaller than the distance between other adjacent spray holes.
7. The spray arm of claim 6, wherein: the opening directions of the other adjacent spray holes face the same rotation direction, so that the water flow sprayed from the annular flow channel forms annular water flow.
8. A spray arm according to claim 3, wherein: the inner ring wall of the O-shaped annular flow passage forms a central hole.
9. The spray arm of any one of claims 1-5, wherein: the atomization generating device is an ultrasonic atomization device.
10. A cleaning machine employing the spray arm of claim 8, wherein: the washing device comprises a washing cavity, wherein an ultrasonic generating device is arranged at the bottom of the washing cavity, and the ultrasonic generating device is positioned below the central hole.
CN201710713871.1A 2017-08-18 2017-08-18 Spray arm and cleaning machine applying same Active CN109394126B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN109394126B true CN109394126B (en) 2024-02-20

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01104959U (en) * 1988-01-07 1989-07-14
JPH02218325A (en) * 1989-02-20 1990-08-31 Matsushita Electric Ind Co Ltd Dish washer and method of operating the same
CN1257689A (en) * 1998-12-18 2000-06-28 三洋电机株式会社 Dish washer
CN102370450A (en) * 2011-09-26 2012-03-14 张英华 Rotating spray arm for dish-washing machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9427132B2 (en) * 2013-01-09 2016-08-30 Haier Us Appliance Solutions, Inc. Spray assembly for a dishwasher appliance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01104959U (en) * 1988-01-07 1989-07-14
JPH02218325A (en) * 1989-02-20 1990-08-31 Matsushita Electric Ind Co Ltd Dish washer and method of operating the same
CN1257689A (en) * 1998-12-18 2000-06-28 三洋电机株式会社 Dish washer
CN102370450A (en) * 2011-09-26 2012-03-14 张英华 Rotating spray arm for dish-washing machine

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