JP4725430B2 - Rotating washing nozzle and dishwasher - Google Patents

Description

  The present invention relates to a rotary washing nozzle and a dishwasher for washing dishes by applying washing water.

In a dishwasher, a rotary washing nozzle that jets washing water toward upper tableware while rotating a nozzle head is used. The nozzle head of the rotary cleaning nozzle is loosely fitted to one end of a nozzle shaft to which cleaning water is supplied, and obtains rotational force by ejecting a part of the cleaning water in the horizontal direction. In this case, since the gap is provided between the nozzle shaft and the nozzle head so that the nozzle head can be rotated with a small force, the cleaning water leaks from the gap. Therefore, there has been a problem that the amount of cleaning water sprayed on the tableware is reduced and the cleaning performance is reduced. Therefore, a rotary cleaning nozzle has been proposed in which a ring-shaped sealing member is provided between the nozzle shaft and the nozzle head to prevent water leakage from the gap. (For example, refer to Patent Document 1.)
JP-A-10-57296 (page 3, FIG. 6)

  In the rotary cleaning nozzle as described above, the friction torque becomes large at the seal portion between the nozzle shaft and the nozzle head, and it is necessary to increase the amount of horizontal injection for applying the rotational force. As a result, the amount of washing water to be reduced is reduced by that amount, and there was a problem that the washing ability was lowered.

  The present invention has been made to solve the above-described problems. It is an object of the present invention to obtain a rotary washing nozzle and a dishwasher having a high washing ability by effectively using the supplied washing water for dishwashing. Objective.

  In the rotary cleaning nozzle according to the present invention, an opening of a nozzle head is loosely fitted to one end of a nozzle shaft having an internal flow path to which cleaning water is supplied, and a part of the internal flow path is provided below the opening. A narrow portion communicating with the outer peripheral surface of the nozzle shaft via the communication hole is provided.

  This invention collects water leakage from the gap between the outer peripheral surface of the nozzle shaft and the opening of the nozzle head in the internal flow path, and can effectively use the supplied wash water for dish washing, so that the rotary washing with high washing ability is possible. A nozzle is obtained.

Embodiment 1 FIG.
1 to 6 show a rotary cleaning nozzle according to Embodiment 1 of the present invention. FIG. 1 is a side view thereof, FIG. 2 is a top view, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a partially enlarged cross-sectional view enlarging a circle A portion of FIG. 3, FIG. 5 is a cross-sectional view taken along line VV of FIG. 1, and FIG. 6 is a side view showing only the nozzle shaft of the rotary cleaning nozzle in FIG. It is. The rotary cleaning nozzle 1 includes a nozzle shaft 2 and a nozzle head 3. The nozzle shaft 2 has an internal flow path 4 to which cleaning water is supplied in the vertical direction, and a cleaning water supply source (not shown) is connected to the lower end portion of the internal flow path 4. Furthermore, as shown in FIG. 6, the nozzle shaft 2 has four discharge ports 2B opened at equal intervals on the outer periphery in the vicinity of the head 2A. The nozzle head 3 has a hollow propeller shape having an internal flow path 6, and an opening 3 </ b> B provided in the lower part of the center is loosely fitted to one end of the nozzle shaft 2 so as to include the discharge port 2 </ b> B of the nozzle shaft 2. is doing. Further, the nozzle head 3 has a gap 5 between the opening 3B and the outer peripheral surface 2C of the nozzle shaft 2 as shown in FIG. Further, as shown in FIG. 2, a plurality of nozzle holes 3A are provided in the upper portion of the nozzle head 3 at different positions from the center, and toward the tableware (not shown) located above the nozzle holes 3A. Spray cleaning water. Further, as shown in FIG. 2, the nozzle hole 3A is inclined so as to have a rightward injection direction component as viewed from the center axis. In addition, about the injection direction of 3 A of nozzle holes, it is also possible to set so that only some nozzle holes 3A may face horizontally, without giving the above inclination.

  Further, as shown in FIG. 4, a narrow portion 4 </ b> A having a reduced flow path cross-sectional area is formed in a part of the internal flow path 4 of the nozzle shaft 2, below the opening 3 </ b> B of the nozzle head 3. Further, as shown in FIG. 5, the nozzle shaft 2 is provided with one communication hole 4B that communicates the downstream side in the narrow portion 4A and the outer peripheral surface 2C. Further, as shown in FIG. 4, the outer peripheral surface 2C of the nozzle shaft 2 is provided with a water leakage receiving portion 2D surrounding the communication hole 4B. The bottom surface of the water leakage receiving portion 2D is an opening portion of the communication hole 4B. It is located at almost the same height.

Next, the operation will be described.
The cleaning water supplied from the cleaning water supply source passes through the internal flow path 4 as shown by the arrow in FIG. 3 and is discharged from the discharge port 2B, and then passes through the internal flow path 6 of the nozzle head 3 to the nozzle hole 3A. Is sprayed toward the tableware. At this time, the nozzle head 3 rotates counterclockwise by the jetting reaction force of the horizontal component of the wash water to be jetted. As a result, the washing water is sprayed evenly on the dishes, and the dishes are washed.

  During such a cleaning operation, a part of the cleaning water leaks from the gap 5 due to the internal pressure and gravity of the cleaning water. The leaked washing water is collected in the water leakage receiving portion 2D located immediately below the gap 5. On the other hand, in the narrow portion 4A formed in the internal flow path 4, the flow rate of the washing water increases and negative pressure is generated. Due to the generated negative pressure, that is, the ejector action, the water leaked in the water leak receiving portion 2D is drawn to the high-speed flow of the narrow portion 4A through the communication hole 4B, and is collected in the internal flow path 4 as indicated by the arrow in FIG. The water flows again into the flow of cleaning water and is jetted from the nozzle hole 3 </ b> A through the internal flow path 6.

  Thus, although a part of the supplied wash water leaks from the gap 5, it is recovered from the communication hole 4B to the internal flow path 4 by the ejector action of the narrow portion 4A. On the other hand, since the gap 5 is formed between the nozzle head 3 and the nozzle shaft 2, the friction torque is reduced and the nozzle head 3 can be rotated with a small rotational force. For this reason, the amount of horizontal injection for applying the rotational force can be reduced, and the amount of cleaning water sprayed to the tableware is increased by that amount, thereby improving the cleaning ability. Therefore, the leaked water can be collected in the internal flow path, and the supplied wash water can be efficiently sprayed on the tableware, and can be effectively used for dish washing.

Next, in order to optimize the narrow portion 4A, the results of trial calculation of the amount of water leakage due to the ejector action in the narrow portion 4A and the pressure loss in the narrow portion 4A will be described.
First, the channel diameter of the narrow portion 4A was narrowed to 10 mm, which is half of the internal channel 4, and the channel cross-sectional area was estimated to be ¼ of the internal channel 4. In addition, the supply amount of the washing water is calculated by fixing to 30 L / min including each condition described later. In the narrow portion 4A, the supplied wash water has a flow rate increased to about 6 m / s, which is four times that in the internal flow path 4, and the wash water of 3 L / min or more is passed through the communication hole 4B by the ejector action. It can be collected in the flow path 4. At this time, the pressure loss in the narrow portion 4A is as small as 3 kPa or less, and the momentum of the cleaning water sprayed from the nozzle hole 3A is not reduced. Therefore, if water leakage from the gap 5 can be suppressed to about 3 L / min, it is possible to eject 30 L / min of cleaning water of the same amount as the supply amount from the nozzle hole 3A, and to effectively use the supplied cleaning water for dish washing. it can.

Subsequently, the channel diameter of the narrow portion 4A was narrowed from the initial condition, and the calculation was performed under the condition of narrowing to less than 1/8 of the channel cross-sectional area of the internal channel 4. In this case, the ejector action is further strengthened and water leakage more than double the initial condition can be recovered in the internal flow path 4 through the communication hole 4B, but the recovered amount is too large compared to the normal leakage amount, It was found that air bubbles would be taken in besides water leakage. In addition, it was found that the pressure loss in the narrow portion 4A increased several times as much as the initial condition, and the momentum of the washing water sprayed on the tableware decreased, so that the supplied washing water could not be effectively used for dish washing.
Furthermore, the channel diameter of the narrow portion 4A was made wider than the initial condition, and the calculation was performed under a condition exceeding 1/2 of the channel cross-sectional area of the internal channel 4. In this case, it has been found that the ejector action is weakened and the amount of leaked water decreases, and conversely, the water flows out from the communication hole 4B to the outside, and the supplied washing water cannot be effectively used for dish washing.

  That is, it was found that the channel cross-sectional area of the narrow portion 4A is preferably adjusted in the range of 1/2 to 1/8 of the channel cross-sectional area of the internal channel 4. Furthermore, in order to effectively use the supplied washing water for dish washing, it is most preferable to adjust the channel cross-sectional area of the narrow portion 4A to ¼ of the channel cross-sectional area of the internal channel 4 which is the initial condition. It turned out to be preferable.

  As for the shape of the narrow portion 4A, as shown in FIG. 4, the boundary portion is formed by a smooth curve, so that a rapid increase in pressure loss at the boundary portion can be suppressed and water leakage can be prevented without reducing the strength of the washing water. It can be recovered. However, even when the boundary portion of the narrow portion 4A is linearly changed as shown in FIG. 7, the flow rate increases. Therefore, it is not possible to collect water leakage by the ejector action and effectively use the supplied wash water for dish washing. Is possible.

  Further, the position of the communication hole 4B communicating with the narrow portion 4A is set on the downstream side of the narrow portion 4A as shown in FIG. 4, thereby ensuring a run-up distance from the upstream side where the flow velocity changes rapidly. Therefore, the flow can be stabilized and the ejector action can be stabilized. Further, since the static pressure that reduces the ejector action is lower on the downstream side, it is desirable that the communication hole 4B communicate with the downstream side of the narrow portion 4A.

  In the above embodiment, the head portion 2A of the nozzle shaft 2 and the upper end portion 3C of the nozzle head 3 constitute a radial thrust bearing portion that supports the nozzle head 3. In this bearing structure, the friction torque increases with the force applied to the bearing portion. However, in the above-described embodiment, it is not necessary to press the seal material, so the weight of the nozzle head 3 or the injection of cleaning water is applied to the bearing portion. Only a small force of reaction force is applied. For this reason, it is possible to reduce the amount of horizontal injection for imparting rotational force, and the amount of washing water sprayed onto the dishes increases by that amount, and the supplied washing water is efficiently injected onto the dishes. Thus, it can be effectively used for washing dishes. If a spiral groove is formed in the head portion 2A and the bearing portion is a spiral groove bearing, a thin film of washing water is generated between the head portion 2A and the upper end portion 3C, and the friction torque can be further reduced. Become.

Embodiment 2. FIG.
FIG. 8 is a partial enlarged cross-sectional view of the rotary cleaning nozzle in the second embodiment. In the drawing, an extension 3 </ b> D is formed in the opening 3 </ b> B of the nozzle head 3 downward along the outer peripheral surface 2 </ b> C of the nozzle shaft 2. And the lower end of this extension part 3D is surrounded by the water leak receiving part 2D.

  In the second embodiment, since the extension 3D is provided in the opening 3B of the nozzle head 3, the length of the gap 5 in the leakage direction is increased and the flow resistance in the leakage direction is increased. The amount of water leakage is reduced. Moreover, since the lower end of extension part 3D is surrounded by water leak receiving part 2D, the water leak from the clearance gap 5 does not fall directly out of the water leak receiving part 2D. Further, the extension 3D is supported on the outer peripheral surface 2C of the nozzle shaft 2 through a film of cleaning water in the gap 5, and serves as a radial bearing for the nozzle head 3 and the nozzle shaft 2 to rotate the nozzle head 3. Has the function of stabilizing

Embodiment 3 FIG.
FIG. 9 is a cross-sectional view of the rotary cleaning nozzle in the third embodiment, and FIG. 10 is a partially enlarged cross-sectional view in which a circle B portion in FIG. 9 is enlarged. In the figure, the bottom surface of the water leakage receiving portion 2D of the nozzle shaft 2 is formed with an inclination in the radial direction so that the inner circumferential side is lower than the outer circumferential side, and the bottom surface on the outer circumferential side rises to the vicinity of the upper end of the communication hole 4B. ing.

  By forming the water leak receiving portion 2D so that the inner peripheral side of the bottom surface is lowered, the water leaked by the water leak receiving portion 2D collects on the inner peripheral side where the communication hole 4B is open as shown by the arrow in FIG. . Therefore, the collected water leakage can be smoothly collected in the internal flow path 4 from the communication hole 4B.

Embodiment 4 FIG.
FIG. 11 is a partial enlarged cross-sectional view of the rotary cleaning nozzle in the fourth embodiment. In the figure, the water leakage receiving portion 2D is a separate member from the main body of the nozzle shaft 2 and has a skirt shape made of an elastic material such as hard rubber, and its inner diameter is slightly smaller than the outer diameter of the outer peripheral surface 2C of the nozzle shaft 2. Is formed. Further, the outer peripheral surface 2C of the nozzle shaft 2 is formed with a constant outer diameter except for the positioning portion 2E protruding below the communication hole 4B. The water leakage receiving portion 2D fitted into the nozzle shaft 2 is positioned by the positioning portion 2E so as to surround the opening portion of the communication hole 4B immediately above the bottom surface, and is brought into close contact with the outer peripheral surface 2C of the nozzle shaft 2 by its elasticity. It is integrated with the nozzle shaft 2.

  In the present embodiment, since the water leakage receiving portion 2D is configured as a separate part from the nozzle shaft 2 main body, even when dust or the like is clogged in the communication hole 4B, the water leakage receiving portion 2D can be removed and easily removed. Maintenance becomes easy.

Embodiment 5 FIG.
FIG. 12 is a partially enlarged sectional view of the rotary cleaning nozzle in the fifth embodiment. In the figure, the nozzle shaft 2 is formed of a cylinder having a constant thickness, and a constricted portion 2F is formed on the outer peripheral surface 2C of the portion where the narrow portion 4A of the internal flow path 4 is formed. The constricted portion 2F replaces the positioning portion 2E of the fourth embodiment, and the inner diameter of the water leakage receiving portion 2D is reduced by the amount that the outer diameter of the constricted portion 2F is smaller than the outer peripheral surface 2C. The water leakage receiving portion 2D fitted into the nozzle shaft 2 is positioned by the constricted portion 2F so as to surround the opening portion of the communication hole 4B immediately above the bottom surface, and is closely attached to the outer periphery of the constricted portion 2F by its elasticity. It is integrated with the shaft 2.

  In the present embodiment, the nozzle shaft 2 main body can be formed by drawing a heat-resistant metal cylinder, so that the durability of the nozzle shaft 2 is enhanced. In particular, even if it is applied to a commercial dishwasher that performs high-temperature washing at a high frequency, the life can be maintained without deterioration due to hydrolysis or the like. Further, since the nozzle shaft 2 before inserting the water leakage receiving portion 2D has no portion having an outer diameter larger than that of the outer peripheral surface 2C, the nozzle shaft 2 is passed through a hole having the same size as the outer peripheral surface 2C. It is possible to install from either the top or bottom side.

Embodiment 6 FIG.
FIG. 13 is a cross-sectional view of the rotary cleaning nozzle in the sixth embodiment. In the figure, the nozzle head 13 is provided with a rod-like member 13F having a spindle-shaped tip portion 13G so that the center of rotation coincides with the axis. The nozzle shaft 12 is provided with an internal flow path 14 having a constant diameter, and the head 12A is provided with an insertion hole 12G that opens larger than the outer diameter of the tip portion 13G. The rod-like member 13F of the nozzle head 13 passes through the insertion hole 12G and is inserted into the internal channel 14, and a narrow portion 14A is formed where the tip portion 13G is located in the internal channel 14. Yes. The formed narrow portion 14A has a donut shape, the outer diameter is the same as the diameter of the internal flow path 14, and the inner diameter is the same as the outer diameter of the tip portion 13G.

  In the present embodiment, since the outer diameter of the narrow portion 14A is formed with the same diameter as the internal flow path 4, the disturbance of the cleaning water flow on the radially outer side is reduced, and the flow in the vicinity of the communication hole 14B is stabilized. Further, since the swirling flow is also generated by the rotation of the rod-shaped member 13F, the ejector action is stabilized. Further, the nozzle head 13 is provided with the rod-like member 13F, so that the center of gravity is lowered, the rotation of the rotating shaft is reduced, and the rotation is stabilized. Further, the specification of the narrow portion 14A formed in the internal flow path 14A of the nozzle shaft 12 can be changed only by adjusting the tip portion 13G of the nozzle head 3.

Embodiment 7 FIG.
FIG. 14 is a cross-sectional view of the rotary cleaning nozzle in the seventh embodiment. In the figure, the rod-like member 13F of the nozzle head 13 is formed with a constant outer diameter up to the tip. The internal flow path 14 of the nozzle shaft 12 is provided with a narrow portion 14C having a slightly small diameter. The head 12A of the nozzle shaft 12 is provided with an insertion hole 12G that is larger than the outer diameter of the rod-shaped member 13F and smaller than that of the sixth embodiment. The narrow portion 14A is formed by inserting a rod-shaped member 13F into the narrow portion 14C of the internal flow path 14. The formed narrow portion 14A has a donut shape, the outer diameter is the same as the diameter of the narrow portion 14C, and the inner diameter is the same as the outer diameter of the rod-shaped member 13F.

  In the present embodiment, the insertion hole 12G of the nozzle shaft 12 can be made smaller than in the sixth embodiment. Therefore, since the force to lift the nozzle head 13 with the pressure of the washing water through the insertion hole 12G can be made smaller than that in the sixth embodiment, the head 12A serving as a bearing for the nozzle head 13 can be satisfactorily provided. , Rotation is more stable. Also in this modification, the specification of the narrow portion 14A can be adjusted by changing the thickness of the rod-shaped member 13F.

Embodiment 8 FIG.
15 and 16 show the rotary cleaning nozzle according to the eighth embodiment. FIG. 15 is a sectional view thereof, and FIG. 16 is a sectional view taken along line XIV-XIV in FIG. As shown in FIG. 15, the nozzle shaft 22 has an internal flow path 24 to which cleaning water is supplied in the vertical direction, and a cleaning water supply source (not shown) is connected to the lower end portion of the nozzle shaft 22. Further, the nozzle shaft 22 has eight discharge ports 22B opened at equal intervals on the outer periphery in the vicinity of the head portion 22A. The discharge port 22B is formed with a narrow portion 24A that becomes narrower in the direction of discharge of the washing water, and the discharge direction is directed obliquely upward. The nozzle head 23 has a hollow propeller shape having an internal flow path 26, and a subflow chamber 23 </ b> H is provided around the opening 23 </ b> B at the center lower portion, as shown in FIG. 16, and the opening 23 </ b> B is connected to the nozzle shaft 22. It is loosely fitted to one end and includes a discharge port 23B of the nozzle shaft 23 so as to be positioned in the subflow chamber 23H. A gap 5 is formed between the opening 23 </ b> B of the nozzle head 23 and the outer peripheral surface 22 </ b> C of the nozzle shaft 22.

Next, the operation will be described.
The washing water supplied from the washing water supply source passes through the internal flow path 24 as shown by the arrow in FIG. 15, and obliquely upwards from the discharge port 22B into the sub-flow chamber 23H near the opening 23B of the nozzle head 23. Released. The discharged wash water becomes a high-speed flow by the narrow portion 24A formed in the discharge port 22B, and goes straight in the sub-flow chamber 23H in a radial manner as indicated by arrows in FIG. The washing water that has traveled straight is jetted from the nozzle hole 23 </ b> A toward the tableware through the internal flow path 26 of the nozzle head 23. The nozzle head 23 rotates counterclockwise by the jetting reaction force of the horizontal component of the jetted washing water, and the washing water is sprayed evenly on the dishes to wash the dishes.

  During such a cleaning operation, a high-speed cleaning water flow from the discharge port 22B of the nozzle shaft 22 flows obliquely upward in the subflow chamber 23H of the nozzle head 23, so that the cleaning water in the vicinity of the gap 5 flows. By the ejector action, it is drawn upward toward this washing water flow. Therefore, water leakage from the gap 5 is suppressed, and the cleaning water supplied to the nozzle shaft 22 can be ejected from the nozzle hole 23A without waste. Since the friction torque is also small as in the first embodiment, the nozzle head 3 can be rotated with a small rotational force. For this reason, the amount of horizontal injection for applying the rotational force can be reduced, and the amount of cleaning water sprayed to the tableware is increased by that amount, thereby improving the cleaning ability. Accordingly, leakage of water can be suppressed, and the supplied wash water can be efficiently sprayed on the dishes to be effectively used for washing dishes. Moreover, in the said embodiment, since the subflow chamber which ensures the straight-ahead distance of the high-speed flow from a discharge outlet was provided in the opening part, an ejector effect | action is stabilized and a water leak can be suppressed effectively.

Embodiment 9 FIG.
17 and 18 show a dishwasher according to Embodiment 9, FIG. 17 is a top view thereof, FIG. 18 is a sectional view taken along line XVIII-XVIII of FIG. 17, and FIG. FIG. The dishwasher in the ninth embodiment includes the rotary cleaning nozzle in each of the above embodiments. The dishwasher 101 includes a drawer-type main body 102 and an external housing 103. As shown in FIG. 18, the main body 102 is supported by a guide rail 103A installed in the external housing 103 so as to be freely inserted and removed. Normally, as shown in FIG. 19, only the decorative panel 102A provided on the front surface of the main body 102 is displayed. And is accommodated in the external housing 103. Most of the space of the main body 102 is occupied by a cleaning tank 104 opened at the top, and a net-like tableware basket 105 is installed at the top of the cleaning tank 104 and the rotary cleaning nozzle 1 is installed at the bottom. Yes. A supply unit 106 for supplying cleaning water to the rotary cleaning nozzle 1 is installed below the cleaning tank 104 and connected to the lower end of the nozzle shaft 2 of the rotary cleaning nozzle 1 through a water supply pipe 106A. Yes. In addition, a leftover filter 107 is provided at the bottom of the washing tank 104 and connected to the supply unit 106 via a water receiving pipe 106B.

Next, the operation will be described.
When using the dishwasher 101, the decorative panel 102A is pulled to bring the main body 102 into the drawn-out state as shown in FIG. Then, a predetermined amount of detergent is also introduced, and the main body 102 is brought into a stored state as shown in FIG. At this time, an upper lid (not shown) installed on the inner upper surface of the outer casing 103 closes the upper opening of the cleaning tank 104 to prevent the cleaning water and steam from leaking out of the cleaning tank 104 during cleaning and drying.

  Subsequently, when a start button (not shown) is pressed, a water supply valve (not shown) is opened, and a predetermined amount of clean water or warm water is supplied into the cleaning tank 104. The supplied water dissolves in the supplied water and is heated by a heater (not shown) installed at the inner bottom of the cleaning tank 104. When the heated cleaning water reaches a predetermined temperature, the supply unit 106 is activated, and the cleaning water in the cleaning tank 104 is sucked into the supply unit 106 from the water receiving pipe 106B through the residual vegetable filter 107 and passes through the water supply pipe 106A. And supplied to the rotary cleaning nozzle 1. The supplied cleaning water is jetted upward while rotating from the nozzle hole 3A of the nozzle head 3 as shown in the above embodiments. The sprayed wash water passes through the net-like tableware basket 105 and uniformly hits the tableware, and the tableware is washed. The washing water then falls to the bottom of the washing tank 104, passes through the leftover filter 107, removes food waste and the like, returns to the supply unit 106 via the receiving water 106B, and is supplied to the rotary washing nozzle 1. And used again for dishwashing.

  When the predetermined time has elapsed, the cleaning with the cleaning water containing the detergent is finished, and the cleaned cleaning water accumulated in the cleaning tank 104 is drained through a water distribution pipe (not shown). When the drainage is completed, water is again supplied to the washing tank 104, and the rinse washing is performed in the same manner as the above washing except that no detergent is used.

  When the rinsing cleaning is completed, the cleaning tank 104 is drained and dried by applying warm air to the tableware for a predetermined time by a heater and a fan (not shown). When the drying is completed, the operation of the dishwasher 101 is completed.

  Since the dishwasher in this embodiment uses the rotary washing nozzle in each of the above embodiments, the supplied washing water can be efficiently sprayed on the tableware and effectively used for dishwashing. Therefore, the cleaning ability is improved, the time required for washing dishes can be shortened, and the power consumption can be reduced accordingly. Further, since the horizontal injection amount that directly hits the side surface of the cleaning tank is small, noise caused by this can be reduced. Further, in the present embodiment, the case where the cleaning water is circulated and used has been described. However, when the cleaning water is used by pouring it over, the amount of water used can be reduced and water can be saved by the amount of the cleaning time being shortened. .

It is a side view of the rotary washing nozzle in Embodiment 1 of this invention. It is a top view of the rotary cleaning nozzle in Embodiment 1 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 1 of this invention. It is a partial expanded sectional view of the rotary washing nozzle in Embodiment 1 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 1 of this invention. It is a side view of the nozzle shaft in Embodiment 1 of this invention. It is sectional drawing of the rotary washing nozzle of another form of Embodiment 1 of this invention. It is a partial expanded sectional view of the rotary washing nozzle in Embodiment 2 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 3 of this invention. It is a partial expanded sectional view of the rotary washing nozzle in Embodiment 3 of this invention. It is a partial expanded sectional view of the rotary washing nozzle in Embodiment 4 of this invention. It is a partial expanded sectional view of the rotary washing nozzle in Embodiment 5 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 6 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 7 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 8 of this invention. It is sectional drawing of the rotary washing nozzle in Embodiment 8 of this invention. It is a top view of the tableware washing machine in Embodiment 9 of this invention. It is a structure sectional view of the tableware washing machine in Embodiment 9 of this invention. It is a structure sectional view of the tableware washing machine in Embodiment 9 of this invention.

Explanation of symbols

1 rotating cleaning nozzle 2 nozzle shaft, 2B discharge port, 2C outer peripheral surface, 2D water leakage receiving part,
3 nozzle head, 3B opening, 3D extension,
4 internal flow path, 4A narrow portion, 4B communication hole, 13F rod-shaped member, 23H side flow chamber,
101 dishwasher, 104 washing tub, 105 tableware basket, 106 supply unit

Claims (6)

A nozzle shaft having an internal flow path to which cleaning water is supplied and a discharge port opened at one end of the internal flow channel, and freely loosely fitted to one end of the nozzle shaft so as to contain the discharge port A nozzle head for ejecting the cleaning water discharged from the discharge port, and a part of the internal flow path below the opening of the nozzle head, and the nozzle shaft A rotary cleaning nozzle having a narrow portion communicating with an outer peripheral surface via a communication hole. The rotary cleaning nozzle according to claim 1, wherein a water leakage receiving portion is provided around the outer peripheral surface of the nozzle shaft so as to surround the communication hole. The rotary cleaning nozzle according to claim 1, wherein an extension portion is formed along the outer peripheral surface of the nozzle shaft in the opening of the nozzle head. The rotary cleaning nozzle according to claim 1, wherein the narrow portion is formed by a rod-like member provided in the nozzle head and inserted into the internal flow path of the nozzle shaft. A nozzle shaft having an internal flow path to which cleaning water is supplied and a discharge port opened at one end of the internal flow channel, and freely loosely fitted to one end of the nozzle shaft so as to contain the discharge port by having an opening, and the nozzle head for jetting washing water released into the vicinity of the opening from the discharge port, it is formed prior Symbol discharge port, narrow narrow toward the discharge direction of the wash water And a rotary cleaning nozzle provided with a secondary flow chamber provided around the opening of the nozzle head . A rotary cleaning nozzle according to any one of claims 1 to 5 , a cleaning tank in which the rotary cleaning nozzle is installed, a table basket accommodated in the cleaning tank, and a supply unit for supplying cleaning water to the rotary cleaning nozzle. A dishwasher characterized by that.

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