JP5116575B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher equipped with a rotatable spray nozzle.

  Conventionally, there is JP-A-11-188003 as a technique in such a field. In the dishwasher described in this publication, an annular collar member is disposed between the shaft portion and the cleaning nozzle in order to achieve smooth rotation of the cleaning nozzle relative to the shaft portion. The support portion provided at the inner end portion of the collar member is inserted into a groove portion provided at the shaft portion, and the outer side of the collar member is fixed to the cleaning nozzle by screws or the like. An annular clearance is provided between the shaft portion and the inner end portion of the collar member.

There exists Unexamined-Japanese-Patent No. 11-188003.

When dirt or small solid matter adhering to an object to be cleaned such as a dish flows in the cleaning nozzle mixed with the cleaning water, the collar member is always exposed to the cleaning water. Under such circumstances, when solid matter flows into the clearance between the shaft portion and the collar member, in the conventional dishwasher, the solid matter easily enters the clearance, and foreign matter does not easily escape in the direction of centrifugal force. This may cause a rotation failure of the cleaning nozzle.
Therefore, if the clearance between the shaft portion and the collar member is reduced in order to prevent a fixed material from flowing between the shaft portion and the collar member, high accuracy is required for the clearance, resulting in an increase in cost. . Moreover, if a solid material enters the clearance, the cleaning nozzle cannot be immediately rotated. On the other hand, if the clearance between the shaft portion and the collar member is increased, solids are less likely to be clogged, but the amount of cleaning water leaking from this clearance increases, reducing the jetting force and rotational force of the cleaning nozzle. There is a risk that. Furthermore, the play of the cleaning nozzle becomes large, and the cleaning nozzle cannot be rotated stably. Therefore, even if the clearance is too small or too large, it affects the rotation of the cleaning nozzle, and there is a limit in achieving stable rotation of the cleaning nozzle by adjusting only the clearance. The same applies to the rinsing nozzle.

  It is an object of the present invention to provide a dishwasher that achieves a stable rotation of the spray nozzle.

The present invention is a dishwasher comprising a spray nozzle rotatably supported by a shaft portion in a washing chamber,
The annular collar member disposed at the boundary between the inner wall surface of the shaft portion and the inner wall surface of the injection nozzle is formed with an inclined surface extending between the inner circumferential side and the outer circumferential side of the collar member,
The inner peripheral side of the collar member slides with respect to the outer peripheral surface of the shaft portion, the outer peripheral side of the collar member is fixed to the injection nozzle, and the inclined surface is arranged to face the outer peripheral surface of the shaft portion. It is characterized by being.

  In this dishwasher, an annular collar member is disposed at a boundary portion between the inner wall surface of the shaft portion and the inner wall surface of the injection nozzle, and the collar member is disposed between the inner circumferential side and the outer circumferential side of the collar member. An extending inclined surface is formed, and the inclined surface is disposed so as to face the outer peripheral surface of the shaft portion. By adopting such a collar member, even if solid matter enters the space formed between the inclined surface and the outer peripheral surface of the shaft portion, the fixed matter can be easily scraped out by the water flow in the injection nozzle. In addition, it has an excellent effect that a fixed object hardly accumulates in this space. Thereby, it is difficult for the solid matter to be sandwiched between the collar member and the shaft portion, and it is possible to prevent the injection nozzle from being stopped or unstable.

  According to the present invention, the injection nozzle can be rotated stably.

Hereinafter, a preferred embodiment of a dishwasher according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the dishwasher 1 is an undercounter type in which a door 5 is provided on the front surface of the washing chamber 3. The dishwasher 1 is partitioned into a cleaning chamber 3 that can accommodate a rack in which tableware is set, and a machine room 7 in which a cleaning liquid tank, a cleaning liquid pump, a booster, and the like are provided.

  A lower piping unit 4 (see FIG. 2) is fixed to the bottom 3 a of the cleaning chamber 3, and a lower nozzle unit 9 is attached to the lower piping unit 4. An upper piping unit 6 (see FIG. 5) is fixed to the ceiling of the cleaning chamber 3, and an upper nozzle unit 11 is attached to the upper piping unit 6.

  First, the lower piping unit 4 and the lower nozzle unit 9 will be described. As shown in FIGS. 2 to 4, the lower piping unit 4 includes a lower supply pipe 13 that supplies cleaning water and rinsing water, and a nozzle header 15 connected to the lower supply pipe 13. The lower nozzle unit 9 is attached to the cleaning nozzle 17 rotatably attached to the nozzle header 15, a nozzle nut 19 attached to the nozzle header 15 so as to sandwich the cleaning nozzle 17, and rotatably attached to the nozzle nut 19. The rinse nozzle 21 is provided.

  The lower supply pipe 13 is a double pipe (see FIG. 4) including an inner pipe 23 that supplies rinsing water and an outer pipe 25 that supplies cleaning water. The lower supply pipe 13 is laid along the bottom 3a of the cleaning chamber 3, and is raised at the center of the bottom 3a.

  The nozzle header 15 has an annular pedestal portion 15 a, and the nozzle header 15 is fitted into the upper end of the outer tube 25 via an O-ring 16. An annular shaft portion 15b for rotatably supporting the cleaning nozzle 17 is provided on the pedestal portion 15a.

  The inner pipe 23 of the lower supply pipe 13 passes through the central hole of the nozzle header 15 and protrudes upward from the shaft portion 15b. At the upper end of the inner tube 23, a support shaft portion 23a in which a male screw is formed is provided.

  The cleaning nozzle 17 includes a donut-shaped holder portion 27 that is rotatably supported by the nozzle header 15, and three nozzle portions 29 that extend radially from the holder portion 27. Each nozzle portion 29 is formed with a plurality of injection ports 29a for injecting cleaning water. A circular lower central opening S1 is formed in the lower part of the holder portion 27, and a circular upper central opening S2 is formed in the upper part.

  An annular collar member 27a for securing a sealing property and smooth rotation of the cleaning nozzle 17 is fixed to an edge forming the lower central opening S1, and the collar member 27a is rotatably supported by a shaft portion 15b. ing. A similar collar member 27b is also fixed to the edge portion forming the upper central opening S2, and the collar member 27b is rotatably supported by the shaft portion 30 of the nozzle nut 19. These collar members 27a and 27b are formed of a resin in consideration of heat resistance and wear resistance.

  The nozzle nut 19 is inserted into the upper central opening S2 so as to close the upper central opening S2, and has a shaft portion 30 on which an internal thread is formed on the inside, and an annular shape projecting outward from the upper portion of the shaft portion 30. And a lid 31. When the shaft portion 30 of the nozzle nut 19 is screwed into the support shaft portion 23a, the cleaning nozzle 17 is rotatably sandwiched between the lid portion 31 and the base portion 15a.

  A flanged shaft tube 33 provided in the rinsing nozzle 21 is inserted into the support shaft portion 23a. A central hole H1 concentric with the screw hole of the shaft portion 30 is formed in the lid portion 31, and a flanged shaft tube 33 is inserted into the central hole H1. The flange 33a of the shaft tube 33 is sandwiched and fixed between an end surface forming a part of the central hole H1 in the lid portion 31 and an end surface of the support shaft portion 23a. The cleaning water introduced into the nozzle portion 29 of the cleaning nozzle 17 is injected from the injection port 29a of the nozzle portion 29, and the cleaning nozzle 17 is rotated by this injection force.

  An annular slidable contact surface 31 a that is in slidable contact with the collar member 27 b is formed on the back surface of the lid portion 31. Furthermore, an annular protrusion 31 b is provided on the back surface of the lid portion 31 so as to surround the sliding contact surface 31 a from the outside and protrude toward the holder portion 27. This protrusion 31b serves as a weir of cleaning water that leaks from between the sliding contact surface 31a and the collar member 27b, and reduces the leakage of cleaning water from the gap between the sliding contact surface 31a and the collar member 27b. Furthermore, even if the cleaning water slightly leaks from under the protrusion 31b, the cleaning water is unlikely to interfere with the cleaning water sprayed from the nozzle portion 29, so that it is difficult to reduce the cleaning effect.

  The upper portion of the shaft tube 33 assembled to the nozzle nut 19 protrudes upward from the nozzle nut 19, and the rinse nozzle 21 is rotatably attached. At the upper end of the shaft tube 33, a threaded cap 39 is screwed so that the rinse nozzle 21 is sandwiched between the upper surface of the nozzle nut 19 and supported rotatably. The shaft tube 33 is formed with a plurality of supply ports 33 b communicating with the inside of the rinsing nozzle 21. The rinsing water is supplied to the rinsing nozzle 21 through the inner tube 23, the shaft tube 33, and the supply port 33b of the lower supply tube 13. The rinse water is ejected from the ejection port 21 a of the rinse nozzle 21.

  Next, the upper piping unit 6 and the upper nozzle unit 11 will be described with reference to FIGS. 5 and 6. The upper piping unit 6 includes an upper supply pipe 41 that supplies cleaning water and rinsing water, and a nozzle header 42 connected to the upper supply pipe 41. Further, the upper nozzle unit 11 is rotatably attached to the cleaning nozzle 45 attached to the nozzle header 42, the nozzle nut 47 attached to the nozzle header 42 so as to sandwich the cleaning nozzle 45, and the nozzle nut 47. And a rinse nozzle 49 provided.

  The upper supply pipe 41 is a double pipe like the lower supply pipe 13 and is laid along the ceiling of the cleaning chamber 3. Note that the outer pipe 41b of the upper supply pipe 41 has a flat and substantially elliptical shape in order to suppress the vertical dimension.

  The nozzle header 42 has a pedestal portion 43, and the pedestal portion 43 has an inner cylinder portion 43b connected to the inner tube 41a of the upper supply pipe 41 and an outer cylinder portion 43c connected to the outer tube 41b. An annular shaft portion 43d for rotatably supporting the cleaning nozzle 45 is provided at the lower portion of the outer cylinder portion 43c. The inner cylinder portion 43b extends along the shaft portion 43d, and a female screw portion 43f is formed at the lower portion.

  The cleaning nozzle 45 includes a donut-shaped holder portion 51 that is rotatably supported by the nozzle header 42, and a plurality of nozzle portions 53 that extend radially from the holder portion 51. A circular upper central opening S3 is formed in the upper part of the holder portion 51, and a circular lower central opening S4 is formed in the lower part.

  An annular collar member 51a for securing a sealing property and smooth rotation of the cleaning nozzle 47 is fixed to an edge forming the upper central opening S3. The collar member 51a is rotatably supported by a shaft portion 43d. ing. A similar collar member 51 b is also fixed to the edge portion forming the lower central opening S 4, and the collar member 51 b is rotatably supported by the shaft portion 57 of the nozzle nut 47.

  The nozzle nut 47 includes a male screw portion 55 that is screwed into the female screw portion 43f of the inner cylinder portion 43b, a circular shaft portion 57 that is inserted into the lower central opening S4 so as to close the lower central opening S4, and a male screw portion 55. And a guide part 59 provided between the shaft part 57 and a cover part 61 projecting outward from the lower part of the shaft part 57. In the nozzle nut 47, the male screw portion 55 is screwed into the female screw portion 43f of the inner cylinder portion 43b, so that the cleaning nozzle 45 is rotatably sandwiched between the lid portion 61 and the pedestal portion 43.

  The nozzle nut 47 is formed with a central hole H2, and a flanged shaft tube 63 provided in the rinsing nozzle 49 is inserted into the central hole H2. An insertion hole H3 is formed in the inner threaded portion 43f of the inner cylinder portion 43b, and a flanged shaft tube 63 is inserted into the insertion hole H3. The flange 63a of the shaft tube 63 is sandwiched and fixed between the end surface forming a part of the insertion hole H3 and the end surface of the male screw portion 55 in the inner cylinder portion 43b. The shaft tube 63 serves as a support shaft that rotatably supports the rinse nozzle 49.

  The guide part 59 of the nozzle nut 47 has a peripheral surface facing the internal space of the nozzle header 42, and a guide surface 65 curved in a concave shape is formed on the peripheral surface. The guide surface 65 guides the cleaning water supplied through the outer tube 41 b and the nozzle header 42 toward the nozzle portion 53 in the lateral direction. The cleaning water introduced into the nozzle portion 53 by the guide surface 65 is jetted from the jet port 53 a of the nozzle portion 53. The cleaning nozzle 45 that has obtained a driving force by the injection of cleaning water rotates. In the upper nozzle unit 11, the nozzle nut 47 receives the water pressure when changing the direction of the cleaning water toward the nozzle portion 53, so that no water pressure is applied to the cleaning nozzle 45 when changing the direction of the cleaning water. The rotation of the cleaning nozzle 45 becomes smooth.

  The lid portion 61 has an outer edge portion 61a (see FIG. 7) formed in a wave shape. The lid 61 is easily gripped by the outer edge 61a, and the nozzle nut 47 is easily removed from the nozzle header 42.

  A lower portion of the shaft tube 63 assembled to the nozzle nut 47 protrudes downward from the nozzle nut 47, and a rinse nozzle 49 is rotatably attached. A threaded cap 67 is screwed to the lower end of the shaft tube 63 so as to slidably support the rinsing nozzle 49 with the lower surface of the nozzle nut 47. A plurality of supply ports 63 b communicating with the inside of the rinse nozzle 49 are formed in the shaft tube 63. The rinsing water is supplied to the rinsing nozzle 49 through the inner pipe 41a, the shaft pipe 63, and the supply port 63b of the upper supply pipe 41. The rinse water is ejected from the ejection port 49 a of the rinse nozzle 49.

  The dishwasher 1 configured as described above employs color members 27a, 27b, 51a, 51b for stably rotating the washing nozzles 17, 45. Since these collar members 27a, 27b, 51a, 51b have the same basic configuration and performance, the collar member 27a will be described below as a representative example.

  As shown in FIGS. 8 and 9, the annular collar member 27 a disposed at the boundary portion between the inner wall surface 70 a of the shaft portion 15 b of the nozzle header 15 and the inner wall surface 70 b of the injection nozzle 17 is substantially cut in cross section by a resin material. It is formed in a right triangle shape, and thinning is achieved. The outer peripheral surface 68 of the collar member 27a is formed with a recess 68a for fitting an annular protrusion 69 protruding from the inner end of the cleaning nozzle 17 toward the lower central opening S1. The collar member 27 a is firmly fixed to the cleaning nozzle 17 by press-fitting or adhesively fixing the protrusion 69 into the recess 68 a.

  Further, the collar member 27a is formed with a flat inclined surface 71 extending between the inner peripheral side and the outer peripheral side, and the inclined surface 71 is disposed so as to face the outer peripheral surface 72 of the shaft portion 15b. Has been. A space A having a triangular cross section is formed by the inclined surface 71 and the outer peripheral surface 72 of the shaft portion 15b.

  By adopting such a collar member 27a, even if the solid matter P enters the space A formed between the inclined surface 71 and the outer peripheral surface 72 of the shaft portion 15b, the fixed matter P is removed by the water flow B in the injection nozzle 17. It can be easily scraped out. Moreover, since the inner wall surface 70a of the shaft portion 15b of the nozzle header 15 and the inner wall surface 70b of the injection nozzle 17 are substantially flush with each other before and after the collar member 27a, the water flow B can be stabilized at this portion. This also has an excellent effect that the fixed object P is very difficult to enter the space A. Therefore, the solid material P is hardly sandwiched between the collar member 27a and the shaft portion 15b, and the stop and unstable rotation of the injection nozzle 17 can be prevented.

  Furthermore, the top portion 73 on the inner peripheral side of the collar member 27a having a substantially right-angled cross section slides in a state close to line contact with the outer peripheral surface 72 of the shaft portion 15b. Thereby, the contact area with respect to the outer peripheral surface 72 of the axial part 15b can be decreased very much, and the rotational resistance of the washing nozzle 17 can be reduced as much as possible. In addition, the solid matter P is hardly sandwiched between the collar member 27a and the shaft portion 15b, which contributes to stopping the injection nozzle 17 and preventing unstable rotation.

  Further, the bottom surface 74 of the collar member 27a is placed on a step surface 15c that is continuous from the outer peripheral surface 72 of the shaft portion 15b and is expanded in the radial direction. When the solid material P enters between the bottom surface 74 and the step surface 15c of the collar member 27a extending horizontally, the washing nozzle 17 rotates while being inclined, but the solid material P easily escapes to the outside by centrifugal force. The rotation of the cleaning nozzle can be quickly returned to normal.

  Further, since the collar member 27a does not jump out of the inner wall surfaces 70a and 70b at the boundary portion between the inner wall surface 70a and the inner wall surface 70b, the water flow B can be stabilized, and the inclined surface 71 In the boundary portion, since it is directed to the downstream side of the water flow B, it is difficult to obstruct the water flow B.

  It goes without saying that the present invention is not limited to the embodiment described above. For example, as the injection nozzle, there are a cleaning nozzle, a rinsing nozzle, and a nozzle that combines cleaning and rinsing, but the present invention is applicable to any of the injection nozzles.

It is a perspective view which shows one Embodiment of the dishwasher which concerns on this invention. It is the disassembled perspective view which looked at the lower nozzle unit from diagonally upward. It is the disassembled perspective view which looked at the lower nozzle unit from diagonally downward. It is sectional drawing of a lower nozzle unit. It is a perspective view of an upper nozzle unit. It is sectional drawing of an upper nozzle unit. It is sectional drawing which shows the nozzle head and nozzle nut of an upper nozzle unit. It is a perspective view which shows the color member applied to the dishwasher which concerns on this invention. It is sectional drawing which expands and shows the principal part of the dishwasher which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Dishwasher, 3 ... Washing room, 15b, 30, 57, 43d ... Shaft part, 17, 45 ... Cleaning nozzle (spray nozzle), 27a, 27b, 51a, 51b ... Color member, 70a ... Shaft part Wall surface, 70b ... inner wall surface of injection nozzle, 71 ... inclined surface, 72 ... outer peripheral surface of shaft, A ... space, P ... solid matter.

Claims (1)

In a dishwasher equipped with a spray nozzle rotatably supported by a shaft in a washing chamber,
An annular collar member disposed at a boundary portion between the inner wall surface of the shaft portion and the inner wall surface of the injection nozzle is formed with an inclined surface extending between the inner peripheral side and the outer peripheral side of the collar member. ,
The inner peripheral side of the collar member slides on the outer peripheral surface of the shaft portion, the outer peripheral side of the collar member is fixed to the injection nozzle, and the inclined surface is the outer periphery of the shaft portion. A tableware purifier arranged to face the surface.

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