JP3481154B2 - dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher and, more particularly, to a nozzle structure for jetting water into a washing chamber. 2. Description of the Related Art Conventionally, in a dishwasher, water is vigorously jetted from a plurality of nozzles perforated on the upper surface of an arm rotatably disposed at the bottom of a washing chamber, and thereby adheres to dishes. There is known a configuration in which dirt is washed away. In such a dishwasher, one method of improving the washing performance or rinsing performance is to make the water jetted from the nozzle hit the dishes evenly and at a high water pressure. For example, in a dishwasher described in JP-A-7-163506, water is jetted in a bowl shape by attaching an inverted conical deflection member to a nozzle provided on an arm. [0003] However, in such a method, since water is not sprayed directly above the nozzle, even if the arm is rotated, water is not completely filled to every corner of the washing chamber. It's not enough to spread. In addition, since the force of the water is killed by the water hitting the deflecting member, there is a problem that the water pressure at the time of hitting the tableware tends to decrease. [0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a dishwasher provided with a nozzle capable of improving cleaning performance and rinsing performance. . [0005] A first dishwasher according to the present invention, which has been made to solve the above-mentioned problems, has an arm upper surface rotatable around a vertical axis. In a dishwasher that sprays water from a plurality of nozzles perforated to wash dishes and the like housed in a washing chamber, at least one of the plurality of nozzles stands substantially perpendicular to the upper surface of an arm. together provided rotatably around a set by a shaft, an impeller having a substantially vertical plurality of blades radially drilled in the top surface of the arm, pressure inside the arm
Spouts the sent water obliquely below the impeller
A water outlet, and water spouted from the water outlet is provided.
The impeller comes into contact with the impeller,
Is rotated and water is washed by the blades that spread radially.
It is characterized by being scattered in various directions within . [0006] In the first dishwasher, when the water pumped into the arm blows out from the water outlet, it comes into contact with the impeller. The impeller rotates with the momentum of the water,
Water is scattered in many directions by the radially extending blades.
Further, since the blades are arranged in a substantially vertical direction, water is also sprayed directly above the impeller. That is, the water is evenly distributed to every corner in the cleaning chamber, and the cleaning and the rinsing without unevenness are performed. According to the dishwasher according to the present invention, since the impeller is provided in the nozzle, water is discharged. Water spreads effectively and reaches the tableware housed in the washing room evenly. For this reason, unevenness in washing and excessive unevenness are eliminated, and the washing performance is improved. An embodiment of the dishwasher according to the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing the structure of the dishwasher of this embodiment. In this dish washer / dryer, a washing room (also serving as a drying room) 2 is disposed inside a machine frame 1, and a door 3 whose lower end is pivotally supported is provided at a front opening of the washing room 2 in a front front direction ( It is provided so as to open in the left direction in FIG. 1). An arm 4 that is rotatable around a water supply shaft 5 is provided at the center of the bottom of the cleaning chamber 2, and nozzles of various shapes as described later are formed on the upper surface of the arm 4. A water tank 6 provided with a circulation port 7 and a drain port 8 on the side thereof is provided at the bottom of the cleaning chamber 2 so as to communicate with each other. Mesh filter 9 for collecting residual foods flowing down from tableware
Is provided. A washing and drainage pump 10 is disposed below the bottom of the washing chamber 2.
The water sucked out of the water supply tank 5 is sent out to the arm 4 via the water supply shaft 5, while the water sucked in from the drainage port 8 of the water storage tank 6 is discharged to the outside through the drainage hose 11. Also,
Water supplied from outside through the water supply valve 12 is supplied to the cleaning chamber 2.
Is poured into the cleaning chamber 2 from a water supply port 13 arranged behind the water supply port. A water level detection chamber 14 having a float (not shown) for detecting a water level in the cleaning chamber 2 is disposed behind the cleaning chamber 2, and water in the cleaning chamber 2 passes through a communication port (not shown). Also flows into 14. Cleaning room 2
A loop-shaped sheathed heater 15 is provided at the bottom for making a large orbit around the water supply shaft 5 to warm the washing water and the rinsing water and to increase the temperature of the air in the washing chamber 2 during drying. A motor 17 is provided on the rear wall surface of the cleaning room 2.
Is provided, and when the blower fan 16 rotates, the outside air sucked from the intake port 18 opened on the back of the machine frame 1 is sent into the cleaning chamber 2. When washing dishes in the dishwasher, the user stores the dishes in a dish basket (not shown), opens the door 3 and places the dish basket in the washing room 2. When the start of washing is instructed, the water supply valve 12 is opened and a predetermined amount of water is stored in the bottom of the washing chamber 2 and the water storage tank 6. This water is heated to a predetermined temperature (usually 6
(About 0 ° C.). When the washing / draining pump 10 is driven, the washing / draining pump 10 sucks warm water from the circulation port 7 of the water storage tank 6 and sends it out to the arm 4. The water rushes out of the small-diameter nozzle, and the arm 4 rotates by the reaction of the jet of water. The jetted water hits the dishes and flows down to the bottom of the washing chamber 2, where solids are removed by the filter 9 and circulated to the water storage tank 6. When the cleaning for a predetermined time (for example, about 10 minutes) is completed, the cleaning and drainage pump 10
The water sucked from the water is discharged to the drain hose 11 and the washing chamber 2
Drain the bottom water. After that, the water supply valve 12 is opened, clean water for rinsing is newly introduced into the cleaning chamber 2, and rinsing is performed for about one minute in the same manner as in the cleaning. After rinsing with water is repeated two or three times, water is introduced into the cleaning chamber 2, and the water is heated to a temperature of about 70 to 80 ° C. by the sheath heater 15. Then, final rinsing is performed with the hot water. As a result, the tableware can be sterilized, and the tableware is warmed, so that quick drying can be performed during the drying operation in the next step. After the final rinsing, the water remaining at the bottom of the washing chamber 2 is discharged, and the blower fan 16 is rotated to send air into the washing chamber 2. The air is heated by the sheath heater 15 to dry the dishes. Next, the structure of the arm 4 will be described in detail. FIG. 2A is a top plan view of the arm 4, and FIG.
FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG. The arm 4 includes an upper case 20 which is a resin molded product and a lower case 21 made of metal (for example, stainless steel). The lower case 21 is provided to a plurality of bosses 23 integrally formed inside the upper case 20. By screwing together with a screw 24, the two are brought into close contact with each other, and the flow path 22 is secured inside. In addition, an opening 25 into which the cylindrical water supply shaft 5 is inserted is provided at the center of the lower case 21 (see FIG. 1).
Water is introduced into the channel 22 extending to both sides through the opening 25. A plurality (seven in this example) of nozzles are arranged on the upper surface of the arm 4. The first nozzle 26 has a water injection hole 27 for injecting water substantially vertically upward. Second
The nozzle 28 has a water injection hole 29 that is elongated in the direction of extension of the arm 4 and that sprays water substantially vertically upward and in a fan shape,
It has a water injection hole 30 which is elongated in the same direction, is substantially orthogonal to the hole, and injects water in a fan shape obliquely upward. Each of the two third nozzles 31 has an elongated shape, and is substantially perpendicular to the hole and is a fan-shaped hole for injecting water in a fan shape obliquely upward.
Two. In addition, the fourth nozzle 33 has a water injection hole 34 for injecting water in a fan shape upward in a direction obliquely intersecting the extending direction of the arm 4. Further, the fifth nozzle 35
Has a water injection hole 36 for directly injecting water obliquely upward substantially orthogonal to the extending direction of the arm 4. Mainly due to the reaction of the water flow injected from the water injection hole 36 of the fifth nozzle 35, the arm 4 is moved around the water supply shaft 5 as shown in FIG.
In (a), it rotates clockwise. The above first to fifth
The shape of the nozzle can be changed as appropriate. The feature of this embodiment lies in the structure of the sixth nozzle 37. FIG. 3 is a cross-sectional view taken along the line BB ′ in FIG. As shown in FIGS. 2B and 3, the sixth nozzle 3
7, the upper wall portion of the upper case 20 is recessed into an inverted truncated cone to form a recess 40, and the bottom wall 42 of the recess 40
A column-shaped boss 43 is erected substantially at the center. An impeller 50 described later is rotatably fitted around the boss 43 so as to be rotatable around the boss 43. FIG. 4A is a top plan view of the impeller 50,
FIG. 4B is a cross-sectional view taken along the line CC ′ in FIG.
FIG. 4C is a sectional view taken along the line DD ′ in FIG. 4A. The impeller 50 is a resin molded product, and eight blades are formed at an angle of 45 ° to each other so as to radially spread outward from the outer peripheral wall of the cylindrical hub 51. These blades have two types of large blades 52 and small blades 53 having different outwardly projecting amounts, and the large blades 52 and the small blades 53 are alternately located along the periphery of the hub 51. ing. The upper ends of the large blades 52 are tapered so as to be inclined upward toward the outside, and the upper ends of the small blades 53 are tapered such that they are inclined downward toward the outside. The lower ends of the blades 52 and 53 are slightly higher than the lower end of the hub 51. As shown in FIG. 2A, four water ejection holes 45 are formed around the boss 43 on the bottom wall 42 of the recess 40 at an angle of 90 ° to each other. As shown in FIG. 3, a part of the peripheral edge of the water ejection hole 45 rises obliquely inward to form a water guide wall portion 46.
Therefore, the water sent through the flow path 22 inside the arm 4 rises along the water guide wall portion 46 and proceeds obliquely upward as indicated by the thick arrow in FIG. It blows up from the wall 42. The root of the boss 43 bulges to the outer peripheral side to form a seat surface 44 having a step that is one step higher than the bottom wall 42 of the recess 40. That is, when the hub 51 of the impeller 50 is inserted into the boss 43, the lower end of the hub 51 comes into contact with the seat surface 44 and the downward position is regulated. On the other hand, a screw 47 whose head has a maximum outer diameter larger than the inner diameter of the hub 51 is screwed into a screw hole (not shown) provided substantially vertically in the center of the boss 43. This prevents the impeller 50 from dropping out of the boss 43. Further, the height from the contact surface to the uppermost end of the boss 43 is larger than the height of the hub 51. Therefore, the impeller 50 is rotatable about the boss 43 as a rotation axis at an arbitrary position between the seat surface 44 and the uppermost end of the boss 43. The water guide wall portions 4 of the four water ejection holes 45 described above.
Numeral 6 is formed such that adjacent ones in a horizontal plane are substantially orthogonal to each other. That is, the direction of the water spouted from each water spout hole 45 is shifted by 90 °, and the spouted water comes into contact with the blades 52 and 53 of the impeller 50 from the same rotation direction. The water spouted from the water spouting hole 45 collides with the blades 52 and 53, and
0 rotates around the boss 43. The water that collided was a wing 5
The direction changes upon hitting 2,53, and it scatters in many directions. Further, a part of the water directly collides with the inclined wall 41 of the concave portion 40 after coming out of the water ejection hole 45, and scatters in various directions. Still another part of the water flows out of the water outlet 45, and then the blades 52,
The jet is directly injected upward without colliding with the 53 or the inclined wall 41. As described above, the water flows through the arm 4 through various paths.
Is sprayed upward from the upper surface of the cleaning chamber 2, so that the water is evenly distributed over a wide area in the cleaning chamber 2. In addition, the force of the jetted water is not uniform, and there are those that send a strong water flow in a relatively small range and those that are weak but spread over a wide range. In the impeller 50, if the number of blades is large, the distance between adjacent blades becomes narrow, the amount of water directly passing through the blades decreases, and the force of the water becomes relatively weak. On the other hand, if the number of blades is small, a sufficient propulsive force for rotating the impeller 50 cannot be obtained. Therefore, by providing two types of blades having different sizes as in the present embodiment, the small blade 53 is provided.
Contributes to the rotation of the impeller 50 without obstructing the passage of water, and the large blades 52 contribute to both the diffusion of the water and the rotation of the impeller 50. In particular, since the small blades 53 are short, a part of the water that has come out of the water injection holes 45 is
It is easy to pass above. The shapes of the large blades 52 and the small blades 53 are not limited to those in the above-described embodiment. For example, only the height of the back may be changed with the same amount of outward projection. The sixth nozzle 3, which is a feature of this embodiment,
7 can be provided at any position of the arm 4. Further, the number thereof may be plural instead of one. The above embodiment is merely an example, and it is apparent that modifications and changes can be made within the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing the overall configuration of a dishwasher according to one embodiment of the present invention. FIG. 2A is a top plan view showing the configuration of the arm of the present embodiment, and FIG. 2B is a cross-sectional view taken along line AA ′ in FIG. FIG. 3 is a sectional view taken along the line BB 'in FIG. 2 (a). 4A is a top plan view of the impeller, FIG. 4B is a sectional view taken along a line CC ′ in FIG. 4A, and FIG.
Sectional sectional view (c). [Description of References] 2 ... Washing chamber 4 ... Arm 5 ... Water supply shaft 20 ... Upper case 21 ... Lower case 22 ... Flow path 37 ... Sixth nozzle 40 ... Depression 41 ... Slope wall 42 ... Bottom wall 43 ... Boss 44 ... Seat Surface 45 Water outlet 46 Water guide wall 47 Screw 50 Impeller 51 Hub 52 Large blade 53 Small blade

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47L 15/00-21/06

Claims (1)

(57) [Claim 1] Cleaning of tableware housed in a cleaning chamber by spraying water from a plurality of nozzles perforated on the upper surface of an arm rotatable about a vertical axis. In a dishwasher that performs, at least one of the plurality of nozzles is provided rotatably about an axis erected substantially vertically on the upper surface of the arm, and a plurality of substantially vertically blades are radially formed. an impeller having, drilled on the upper surface of the arm, ah
The water pumped into the system is obliquely below the impeller.
And a water ejection hole ejected from the water ejection hole.
The discharged water comes into contact with the impeller, and due to the force of the water,
The impeller rotates and the blades spread radially
A dishwasher , wherein water is scattered in various directions in a washing room .