Cleaning nozzle and dishwasher provided with same

Abstract

The invention provides a cleaning nozzle and a dishwasher provided with the cleaning nozzle. The cleaning nozzle is provided with a spray head having a sphere accommodating part. The ball housing portion includes an inner space, a ball, a guide groove, a bypass passage, and two opening portions. The ball moves inside the internal space. The guide groove is disposed so as to face the inner space, and has an opening in the center thereof that communicates with the discharge port of the showerhead. The bypass passage is disposed inside the side wall of the ball housing part. The two openings are disposed on the opposite sides of the bypass passage, respectively, and communicate the bypass passage with the internal space of the ball housing part. When the ball body abuts against the two end portions of the guide groove in the length direction, the corresponding opening portion of the two opening portions is blocked by the ball body.

Description

Technical Field

[0001] The present invention relates to a washing nozzle for washing dishes and the like by spraying washing water, and a dishwashing machine including the washing nozzle. Background Art

[0002] Fig.18 FIG. 2 is a diagram showing the structure of a washing system of a conventional dishwasher. Fig.18 As shown, generally speaking, a dishwashing machine has a plurality of dishwashing baskets (an upper dishwashing basket 101 and a lower dishwashing basket 103) in a washing tank to efficiently wash a large amount of dishes. Washing nozzles 102a and 102b are respectively arranged at positions corresponding to the upper dishwashing basket 101 and the lower dishwashing basket 103 (for example, see Japanese Patent Application Publication No. 2007-282831).

[0003] Washing water is pumped under pressure by a built-in washing pump and sprayed toward dishes from nozzles disposed at washing nozzles 102a and 102b. Conventional dishwashers wash the entire dishes with a small amount of water while alternately switching the spraying from washing nozzles 102a and 102b.

[0004] Specifically, the cleaning nozzle 102a is disposed below the upper tableware basket 101 to clean the tableware placed in the upper tableware basket 101. The cleaning nozzle 102b is disposed below the lower tableware basket 103 to clean the tableware placed in the lower tableware basket 103. Each of the cleaning nozzles 102a and 102b has a rotation shaft and an arm.

[0005] The arm has a plurality of nozzles with respective discharge ports set in their directions to spray washing water at various angles toward the dishes. Generally, washing nozzles 102a and 102b are rotating nozzles that rotate the arm using the reaction force of the jet flow and spread the jet flow over a wide range.

[0006] Fig.19 FIG. 2 is a diagram showing the structure of a cleaning system of another conventional dishwasher. Fig.19 As shown, the fixed nozzle 104 is fixed to the side wall in the cleaning tank and has a plurality of nozzle heads whose directions of discharge ports are set so as to form various spray angles (see, for example, Japanese Patent Application Laid-Open No. 2012-91041). Summary of the invention

[0007] The present invention provides a dishwasher having a washing nozzle capable of spraying washing water at a wide angle by swinging the spraying direction of the washing water.

[0008] A cleaning nozzle according to one aspect of the present invention includes a nozzle head that sprays cleaning water supplied via a water conduit into a cleaning tank. In the cleaning nozzle, the nozzle head includes a ball housing portion, an inlet port, and a discharge port.

[0009] The ball storage part has an internal space surrounded by a wall facing the water guide, a wall facing the cleaning tank, and a cylindrical side wall. The inlet is arranged on the wall facing the water guide so that the ball storage part and the water guide are connected. The outlet is arranged on the wall facing the cleaning tank so that the ball storage part and the cleaning tank are connected. The outlet has an elliptical shape.

[0010] The ball storage part includes a ball, a guide groove, a bypass passage and two openings. The ball can move inside the internal space. The guide groove is arranged on the side of the internal space facing the wall of the cleaning tank, and has an opening in the center that is connected to the discharge port. The guide groove has an elliptical shape. The bypass passage is an annular waterway arranged inside the side wall. The two openings are arranged one on each side of the bypass passage, so that the bypass passage and the internal space of the ball storage part are connected.

[0011] When the ball comes into contact with both ends of the guide groove in the longitudinal direction, the corresponding opening of the two openings is closed by the ball.

[0012] The cleaning nozzle of the present invention can expand the range of the water jet flow by swinging the spray direction by using water pressure. As a result, the jet flow can be efficiently sprayed onto the tableware arranged in the limited space of the tableware basket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a perspective view of a washing tank included in the dishwasher according to the first embodiment of the present invention.

[0014] Figure 2 The washing tank of the dishwasher according to the first embodiment is Figure 1 A cross-sectional view taken along line II-II is shown.

[0015] Figure 3 The washing tank of the dishwasher according to the first embodiment is Figure 1 The cross-sectional view of III-III is shown.

[0016] Figure 4 This is a perspective view of a spray head included in the dishwasher according to the first embodiment.

[0017] Figure 5 This is a central longitudinal sectional view of the shower head included in the dishwasher according to the first embodiment.

[0018] Figure 6 This is a central cross-sectional view of the shower head included in the dishwasher according to the first embodiment.

[0019] Figure 7 This is a plan cross-sectional view of the spray head included in the dishwasher according to the first embodiment.

[0020] Figure 8 This is a plan cross-sectional view of the spray head included in the dishwasher according to the first embodiment.

[0021] Fig.9A This is a cross-sectional view showing the state inside the shower head of the dishwasher according to the first embodiment before operation.

[0022] Fig. 9B This is a cross-sectional view showing a state inside the shower head during operation of the dishwasher according to the first embodiment.

[0023] Fig. 10A This is a cross-sectional view of the shower head schematically showing the movement of the spherical body and the state of the water flow in the shower head of the first embodiment.

[0024] Fig. 10B This is a cross-sectional view of the shower head schematically showing the movement of the spherical body and the state of the water flow in the shower head of the first embodiment.

[0025] Fig. 10C This is a cross-sectional view of the shower head schematically showing the movement of the spherical body of the shower head and the state of the water flow according to the first embodiment.

[0026] Fig.11 This is a central longitudinal sectional view of a shower head included in a dishwasher according to a second embodiment of the present invention.

[0027] Fig.12 This is a central cross-sectional view of a flow inlet of a shower head included in the dishwasher according to the second embodiment.

[0028] Fig.13A This is a cross-sectional view of the nozzle head showing the movement of the spherical body and the state of the water flow in the nozzle head of the second embodiment.

[0029] Fig. 13B This is a cross-sectional view of the nozzle head schematically showing the movement of the spherical body and the state of the water flow in the nozzle head of the second embodiment.

[0030] Fig. 13C This is a cross-sectional view of the nozzle head schematically showing the movement of the spherical body and the state of the water flow in the nozzle head of the second embodiment.

[0031] Fig.14 It is a central longitudinal sectional view of a dishwasher according to a third embodiment of the present invention.

[0032] Fig.15 This is a central longitudinal sectional view of a flow inlet of a shower head included in the dishwasher according to the third embodiment.

[0033] Fig.16A This is a cross-sectional view schematically showing the movement of the spherical body and the state of the water flow in the nozzle of the third embodiment.

[0034] Fig. 16B This is a cross-sectional view schematically showing the movement of the spherical body and the state of the water flow in the nozzle of the third embodiment.

[0035] Fig. 16C This is a cross-sectional view schematically showing the movement of the spherical body and the state of the water flow in the nozzle of the third embodiment.

[0036] Fig.17 It is a perspective view of the rotary nozzle of the dishwasher according to Embodiments 1 to 3.

[0037] Fig.18 It is a diagram showing the structure of a washing system of a conventional dishwasher.

[0038] Fig.19 It is a diagram showing the structure of a washing system of another conventional dishwasher.

[0039] Fig. 20 This is a cross-sectional view of a nozzle included in other conventional dishwashers. DETAILED DESCRIPTION

[0040] A cleaning nozzle according to a first aspect of the present invention is a cleaning nozzle having a nozzle for spraying cleaning water supplied via a water conduit into a cleaning tank. In the cleaning nozzle, the nozzle includes a ball housing, an inlet, and a discharge port.

[0041] The ball storage part has an internal space surrounded by a wall facing the water guide, a wall facing the cleaning tank, and a cylindrical side wall. The inlet is arranged on the wall facing the water guide so that the ball storage part and the water guide are connected. The outlet is arranged on the wall facing the cleaning tank so that the ball storage part and the cleaning tank are connected. The outlet has an elliptical shape.

[0042] The ball storage part includes a ball, a guide groove, a bypass passage and two openings. The ball can move inside the internal space. The guide groove is arranged on the side of the internal space facing the wall of the cleaning tank, and has an opening in the center that is connected to the discharge port. The guide groove has an elliptical shape. The bypass passage is an annular waterway arranged inside the side wall. The two openings are arranged one on each side of the bypass passage, so that the bypass passage and the internal space of the ball storage part are connected.

[0043] When the ball comes into contact with both ends of the guide groove in the longitudinal direction, the corresponding opening of the two openings is closed by the ball.

[0044] According to this method, when one of the two openings is blocked by the ball, a difference is generated between the two pressures from the two openings in the bypass passage. According to the pressure difference, water enters the bypass passage from the other of the two openings, i.e., the open opening, and a water flow toward the blocked opening is generated in the bypass passage.

[0045] The water flow in the bypass passage pushes the ball blocking the opening and enters the ball receiving portion. As a result, the ball is pushed by the water flow and moves toward the opened opening on the guide groove.

[0046] When the ball reaches the open opening and blocks the opening, the ball is pushed by the water flow in the opposite direction for the same reason. As a result, the ball moves in the opposite direction on the guide groove. By repeating this movement, the ball slides back and forth along the guide groove spontaneously. In addition, when the water jet flows through the discharge port, the wall effect is exerted along the surface of the ball.

[0047] Therefore, the ejection direction of the water jet from the discharge port can be periodically oscillated by the spontaneous vibration of the sphere and the Coanda effect. As a result, the discharge range of the water jet has a fan-shaped shape when viewed from the front.

[0048] In the cleaning nozzle according to a second aspect of the present invention, in addition to the first aspect, the inflow port has a center located on the central axis of the internal space of the ball housing portion.

[0049] According to this aspect, when the washing pump starts to operate and water flows from the inlet into the internal space of the ball housing portion, the water easily spreads throughout the entire internal space. As a result, the water can be quickly ejected after the washing pump starts to operate.

[0050] In the cleaning nozzle according to the third aspect of the present invention, in addition to the first aspect, the two openings respectively connect the corresponding ends of both ends in the longitudinal direction of the guide groove with the bypass passage.

[0051] According to this method, when one of the two openings is blocked by the ball, a difference is generated between the two pressures from the two openings in the bypass passage. According to the pressure difference, water enters the bypass passage from the other of the two openings, i.e., the open opening, and a water flow toward the blocked opening is generated in the bypass passage.

[0052] The water flow in the bypass passage pushes the ball blocking the opening and enters the ball storage portion. As a result, the ball is pushed by the water flow and can move toward the open opening on the guide groove.

[0053] In the cleaning nozzle of the fourth aspect of the present invention, in addition to the first aspect, the ball reciprocates along the guide groove. When the ball is located at both ends of the guide groove in the longitudinal direction, the ball abuts against the side walls of the ball storage portion near the corresponding openings of the two openings.

[0054] According to this aspect, any one of the two openings can be reliably closed by the spherical body.

[0055] In the cleaning nozzle of the fifth aspect of the present invention, based on the first aspect, the guide groove has two recessed parts arranged along the length direction of the guide groove. When the sphere abuts against the two ends of the guide groove in the length direction, the sphere is located in the corresponding recessed part of the two recessed parts. The two recessed parts of the guide groove have a curved shape protruding toward the discharge port.

[0056] According to this aspect, when the ball moves toward the discharge port due to the water flow entering the internal space of the ball storage portion from the inlet, it will definitely reach a certain recessed portion due to the curved shape of the guide groove. Thus, the ball can be made to reciprocate stably and spontaneously.

[0057] In the cleaning nozzle according to a sixth aspect of the present invention, in addition to the first aspect, the guide groove is inclined at a predetermined angle with respect to a plane perpendicular to the central axis direction of the internal space.

[0058] According to this embodiment, when the ball moves toward the outlet due to the water flow entering the inner space of the ball storage portion from the inlet, it will definitely move toward the end of the guide groove near the outlet along the inclination of the guide groove.

[0059] In the cleaning nozzle of the seventh aspect of the present invention, in addition to the first aspect, the ball housing portion further includes a barrier wall which is arranged in the internal space closer to the inlet than the outlet and is perpendicular to the longitudinal direction of the guide groove.

[0060] According to this method, when the water flow from the inlet passes through the barrier, a Karman vortex is generated near the barrier. The Karman vortex is periodically generated alternately on the left and right sides of the barrier. Therefore, according to the water pressure of the Karman vortex, the sphere reciprocates between the two recesses. As a result, the sphere can perform a stable spontaneous reciprocating slide.

[0061] An eighth aspect of the present invention is a dishwasher including: a washing tank for storing objects to be washed; a washing pump for pressurizing washing water; and the washing nozzle according to any one of the first to seventh aspects.

[0062] This allows the water jet that collides with the dishes to be ejected over a wider range, thereby improving the washing performance.

[0063] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described here.

[0064] (Implementation Method 1)

[0065] [1-1. Basic structure]

[0066] Figure 1This is a perspective view of washing tank 2 included in dishwasher 1 according to Embodiment 1. Figure 2 The washing tank 2 of the dishwasher 1 is along the Figure 1 A cross-sectional view taken along line II-II is shown. Figure 3 The washing tank 2 of the dishwasher 1 is along the Figure 1 A cross-sectional view taken along line III-III is shown.

[0067] like Figure 1 to Figure 3 As shown, the dishwasher 1 includes a housing (not shown) and a washing tank 2 that can be pulled out from the housing when a door 1a is opened. A user places objects to be washed, such as dishes, on a tableware basket and stores them in the washing tank 2.

[0068] In dishwasher 1, washing water is supplied to washing tank 2 via a water supply valve (not shown). Washing water is pressurized by washing pump 3 and supplied to washing nozzle 5 (washing member) having a plurality of nozzles 4. Washing nozzle 5 sprays washing water toward dishes.

[0069] The washing pump 3 has a motor with a variable speed for changing the pressure of the washing water and an inverter circuit for controlling the motor. The washing tank 2 has an upper cutlery basket 6, a middle cutlery basket 7, a lower cutlery basket 8 and a plurality of washing nozzles 5 (rotating nozzle 5a, fixed nozzles 5b, 5c).

[0070] The rotating nozzle 5a corresponds to the lower tableware basket 8 and rotates around the rotation axis by using the spray reaction force. The fixed nozzles 5b and 5c are fixed to the side wall of the washing tank 2 and correspond to the upper tableware basket 6 and the middle tableware basket 7, respectively. Both the upper tableware basket 6 and the middle tableware basket 7 are not necessarily required, as long as at least one of them is configured. The washing nozzles 5 corresponding to the upper tableware basket 6 and the middle tableware basket 7 are not limited to the fixed nozzles fixed to the side wall of the washing tank 2.

[0071] Drain port 9 is disposed at the bottom of washing tank 2 and communicates with the suction side of washing pump 3. Drain port 9 includes a debris filter (not shown) for collecting debris and a drainage pump (not shown) for draining the washing water in washing tank 2.

[0072] Water distribution device 10 is disposed in the discharge path of washing pump 3. Water distribution device 10 selectively supplies washing water pressurized by washing pump 3 to rotating nozzle 5a, fixed nozzle 5b and fixed nozzle 5c using a valve element (not shown) disposed therein.

[0073] [1-2. Basic movements]

[0074] In the above-described configuration, first, basic operations of dishwasher 1 will be described.

[0075] Each operation of dishwasher 1 is performed by controlling each component by a built-in control unit (not shown). The control unit includes a processor and a semiconductor memory. The control unit controls each component by operating the processor in accordance with software stored in the semiconductor memory.

[0076] The user places dishes and other objects to be washed in the tableware basket, stores the washing tank 2 in the housing, puts in detergent, and then closes the opening of the housing of the dishwashing machine 1 with the door to start the operation of the dishwashing machine 1. The control unit sequentially performs a "washing process" for washing the objects to be washed, a "rinsing process" for rinsing attached detergent and residues, and a "drying process" for drying the objects to be washed.

[0077] In the washing process, the control unit operates the water supply valve (not shown) to supply a predetermined amount of washing water to the washing tank 2, and the washing water is accumulated at the bottom of the washing tank 2. When the control unit operates the washing pump 3, the washing water is sucked into the washing pump 3 through the residue filter. After being pressurized by the washing pump 3, the washing water is supplied to the washing nozzle 5 (rotating nozzle 5a, fixed nozzle 5b, 5c) through the water conduit 15, and is sprayed from the washing nozzle 5 to the washing tank 2.

[0078] The sprayed washing water becomes a water jet, collides with the dishes and washes away the dirt. After colliding with the dishes or the side wall of the washing tank 2, the washing water flows down to the bottom of the washing tank 2 and returns to the drain port 9, and is supplied to the suction side of the washing pump 3 again. The washing water circulates in such a path. At this time, the residues falling off the dishes flow into the residue filter together with the washing water. The residues of a size that cannot pass through the residue filter are captured by the residue filter.

[0079] After the water distribution device 10 sprays the washing nozzles 5 corresponding to each cutlery basket (each upper cutlery basket 6, interrupted cutlery basket 7 and lower cutlery basket 8) for a predetermined time, the entire cutlery is washed while switching the washing nozzles 5 in sequence. When the washing process is finished, the control unit operates the drainage pump to discharge the washing water containing dirt, and operates the water supply valve to supply new washing water to the washing tank 2.

[0080] In the rinsing process, the control unit operates the washing pump 3, and again sprays washing water to the washing nozzle 5 to rinse the dishes and the wall surface of the washing tank to which the detergent and residue are attached. In this case, as in the washing process, after spraying to the washing nozzle 5 for each predetermined time, the washing nozzle 5 is switched in sequence while rinsing the dishes and the entire wall surface of the washing tank 2.

[0081] After a predetermined time, the control unit drains the washing water and performs a rinsing process by supplying washing water again into washing tank 2. After repeating the rinsing process 2 to 3 times, the control unit drains the washing water and ends the rinsing process.

[0082] After that, the control unit performs a drying process for a predetermined time to evaporate water droplets adhering to the dishes and the wall surface of the washing tank 2. When the drying process is completed, a series of operations are completed.

[0083] [2-1. Structure of the nozzle]

[0084] Next, the structure and operation of the nozzle head 4 of the cleaning nozzle 5, which is one of the features of the present embodiment, will be described. The cleaning nozzle 5 of the present embodiment described below is a fixed nozzle 5b, 5c.

[0085] Figure 4 It is a three-dimensional diagram of the nozzle 4. Figure 5 It is a central longitudinal sectional view of the nozzle 4. Figure 6 It is a central cross-sectional view of the nozzle 4. Figure 7 It is a plan cross-sectional view of the nozzle head 4 showing the discharge port 14 as viewed from the ball housing portion 11 . Figure 8 It is a plan cross-sectional view of the nozzle 4 for showing the bypass passage 18 .

[0086] A longitudinal section view is a sectional view when viewed from the front. A transverse section view is a sectional view when viewed from the side. A plan view is a sectional view when viewed from the top. The front view, side view, and top view are described below.

[0087] like Figure 2 to Figure 6 As shown, the cleaning nozzle 5 (fixed nozzles 5 b and 5 c ) has a plurality of nozzles 4 and a water conduit 15 communicating with the nozzles 4 .

[0088] The plurality of nozzles 4 each include a ball housing 11, an inlet 16, and an outlet 14. The ball housing 11 includes a wall surface 11b, a wall surface 11c, a cylindrical side wall 11d, and a cylindrical internal space 11a surrounded by the wall surface 11b, the wall surface 11c, and the side wall 11d. A cross section of the internal space 11a perpendicular to the central axis C (see Figure 7 , Figure 8 ) can be a perfect circle or an ellipse.

[0089] like Figures 5 to 8 As shown, the inlet 16 is arranged on the wall surface 11b, so that the ball storage part 11 and the water conduit 15 are connected. The wall surface 11b is the wall surface of the water conduit 15 facing the ball storage part 11. In this embodiment, the inlet 16 can also be a plurality of holes instead of a single hole. The outlet 14 is arranged on the wall surface 11c, and is an elliptical hole that connects the ball storage part 11 and the cleaning tank 2. The wall surface 11c is the wall surface of the cleaning tank 2 facing the ball storage part 11.

[0090] The "ellipse" of the present invention is a shape such as a track and field race track formed by connecting two semicircles spaced apart and facing each other with two straight lines (see Figure 7However, the present invention is not limited thereto, and the "ellipse" may also be an ellipse in the usual sense.

[0091] The line connecting the center of the inlet 16 and the center of the outlet 14 coincides with the central axis C of the ball housing portion 11. That is, the inlet 16 and the outlet 14 are respectively arranged on the wall surfaces 11b and 11c of the ball housing portion 11 so that their centers are located on the central axis C of the ball housing portion 11. The ball housing portion 11 has a guide groove 12 and a ball 13 therein.

[0092] like Figure 7 As shown, the guide groove 12 is arranged on the discharge port 14 side of the ball housing portion 11 so as to surround the discharge port 14 in a plan view. The guide groove 12 has an opening which is arranged at the center of the guide groove 12 in a plan view and communicates with the discharge port 14.

[0093] In the following drawings of the present invention, a rectangular coordinate system including an X-axis, a Y-axis, and a Z-axis is used to indicate the orientation of the nozzle 4. Figures 4 to 8 As shown, the X-axis extends along the length direction of the discharge port 14, and the Y-axis extends along the width direction of the discharge port 14. The Z-axis extends along the central axis C of the internal space 11a of the ball storage portion 11. That is, the XY plane is a plane parallel to the X-axis and the Y-axis. The YZ plane is a plane parallel to the Y-axis and the Z-axis. The ZX plane is a plane parallel to the Z-axis and the X-axis.

[0094] In the present invention, the side view refers to the situation of observation along the X-axis. The front view refers to the situation of observation along the Y-axis. The top view refers to the situation of observation along the Z-axis. In the case of a longitudinal sectional view, the cross section is parallel to the ZX plane, and in the case of a transverse sectional view, the cross section is parallel to the YZ plane. The cross section of a planar sectional view is parallel to the XY plane.

[0095] like Figure 7 and Figure 8 As shown, the guide groove 12 has an elliptical shape when viewed from above, and the elliptical shape has a major axis parallel to the major axis of the elliptical discharge port 14. Figure 5 and Figure 6 As shown, the guide groove 12 is parallel to a plane (ie, XY plane) perpendicular to the central axis C (ie, Z axis) of the internal space 11a of the ball housing 11 in front view. The guide groove 12 has a semicircular arc cross section set by an offset dimension of the ball diameter in side view.

[0096] In this embodiment, the diameter of the ball 13 is set to 6 mm, and the diameter of the arc-shaped guide groove 12 is set to 6.3 mm. According to this structure, the ball 13 can slide in the ball housing portion 11 along the guide groove 12 in the longitudinal direction of the guide groove 12, that is, along the X axis.

[0097] like Figure 5 and Figure 7 As shown, the guide groove 12 has a recess 12a and a recess 12b. The recesses 12a and 12b are respectively arranged to abut the corresponding ends of the two ends in the longitudinal direction of the guide groove 12. The recesses 12a and 12b each have a curved shape protruding toward the negative direction of the Z axis, that is, the discharge port 14.

[0098] Therefore, when the ball 13 slides back and forth on the guide groove 12 along the X-axis when viewed from above, the ball 13 moves along the Z-axis toward the positive and negative directions of the Z-axis when viewed from the side. Hereinafter, the ball 13 sliding back and forth on the guide groove 12 is referred to as the reciprocating sliding of the ball 13 along the guide groove 12.

[0099] When the ball 13 reaches both ends of the guide groove 12, the ball 13 contacts the side walls 11d of the ball receiving portion 11 connected to both ends of the guide groove 12. In the present embodiment, the inner diameter of the internal space 11a of the ball receiving portion 11 is set to about 10 mm in a plan view. The distance between the center of the ball 13 when located in the recess 12a and the center of the ball 13 when located in the recess 12b is set to about 4 mm.

[0100] The discharge port 14 has a short axis of 3 mm and a long axis of 5 mm in a plan view. The dimension of the long axis is the same as or slightly larger than the distance in the X-axis direction when the ball 13 reciprocates along the guide groove 12.

[0101] like Figure 8 As shown, when the ball 13 is located at either end of the guide groove 12 in the longitudinal direction, the ball 13 covers about half of the discharge port 14 in a plan view. Figure 5 As shown, in the front view, the guide groove 12 has a curved shape in which the central portion in the longitudinal direction protrudes in the positive direction of the Z axis more than other portions. Figure 7 As shown, in a plan view, the width Wc of the central portion of the guide groove 12 in the longitudinal direction is narrower than the maximum width Wr of the recessed portions 12a and 12b.

[0102] like Figure 8 As shown in FIG. 1 , the ball storage portion 11 has a bypass passage 18 and an opening 17. The bypass passage 18 and the opening 17 are arranged inside the side wall 11d of the ball storage portion 11. The bypass passage 18 is an annular water passage parallel to the XY plane. That is, the bypass passage 18 is parallel to the central axis C (refer to FIG. 1 ) of the internal space 11a of the ball storage portion 11. Figure 5 , Figure 6 )vertical.

[0103] like Figure 7 and Figure 8As shown, the opening 17 includes an opening 17a and an opening 17b, which connect the ball storage portion 11 and the bypass passage 18. The openings 17a and 17b are arranged on opposite sides of the bypass passage 18. The opening 17a is arranged on the side wall 11d of the recessed portion 12a of the ball storage portion 11, and the opening 17b is arranged on the side wall 11d of the recessed portion 12b of the ball storage portion 11.

[0104] like Figure 5 As shown, the position of the opening 17a in the Z-axis direction is the same as the position of the center of the sphere 13 in the Z-axis direction when it is located in the recess 12a. Similarly, the position of the opening 17b in the Z-axis direction is substantially the same as the position of the center of the sphere 13 in the Z-axis direction when it is located in the recess 12b.

[0105] [2-2. Nozzle Operation]

[0106] Fig.9A , Fig. 9B The diagrams are central cross-sectional views showing the state inside the nozzle head 4 of the dishwasher 1 before and during operation, respectively. Figures 10A to 10C FIG. 4 is a cross-sectional view of the nozzle 4 schematically showing the movement of the sphere 13 in the nozzle 4 and the direction of the water flow in the nozzle 4 of the present embodiment. Figures 10A to 10C In each of the drawings, the left figure is a longitudinal sectional view of the nozzle 4 , and the right figure is a plan sectional view of the nozzle 4 .

[0107] In the above structure, when the washing pump 3 starts to operate, the water pressurized by the washing pump 3 flows into the ball housing 11 from the inlet 16 through the water conduit 15 and is ejected from the outlet 14 to the washing tank 2 .

[0108] like Fig.9A As shown in FIG. 1 , when the cleaning pump 3 is stopped, the ball receiving portion 11 is not filled with water. In this case, the ball 13 is separated from the guide groove 12. When water flows into the ball receiving portion 11 from the inlet 16, as shown in FIG. Fig. 9B As shown, the ball 13 moves in the negative direction of the Z axis due to the water flow from the inlet 16 toward the outlet 14 and contacts the guide groove 12 .

[0109] like Figure 5 As shown in FIG. 1 , the positions of the recessed portions 12a and 12b of the guide groove 12 in the Z-axis direction are closer to the discharge port 14 than the center in the longitudinal direction of the guide groove 12. That is, in terms of the water flow from the inlet 16 toward the discharge port 14, the recessed portions 12a and 12b of the guide groove 12 are located downstream of the center in the longitudinal direction of the guide groove 12. Therefore, when water flows into the ball housing portion 11, the ball 13 is bound to move to one of the recessed portions 12a and 12b of the guide groove 12.

[0110] For example, Fig. 10AAs shown in FIG. 1 , when the ball 13 reaches the concave portion 12a of the guide groove 12, the ball 13 is connected to the concave portion 12a and one end portion of the guide groove 12 in the length direction (at Fig. 10A In this case, the opening 17a is blocked by the ball 13 (see Figure 5 As a result, water flows into the bypass passage 18 from the unblocked opening 17b, and the bypass passage 18 is filled with the water.

[0111] As described above, when the ball 13 is not in contact with any of the openings 17a and 17b (see Fig.9A ) under the condition that static pressure is applied to the ball housing portion 11 from both the openings 17a and 17b inside the bypass passage 18, and the pressures from the two openings in the bypass passage 18 are balanced.

[0112] like Fig. 10A As shown, when the opening 17a is blocked by the ball 13, the static pressure from the opening 17a is not applied to the bypass passage 18. Therefore, a difference occurs between the two pressures in the bypass passage 18, which are from the opening 17a and the opening 17b.

[0113] According to the pressure difference, water enters the bypass passage 18 from the opening 17b, and a water flow toward the opening 17a is generated in the bypass passage 18 (see Fig. 10A The water flow in the bypass passage 18 pushes the ball 13 blocking the opening 17a away and enters the ball storage portion 11. The ball 13 moves toward the opening 17b on the guide groove 12 due to the water flow (see Fig. 10A left image).

[0114] like Fig. 10C As shown in FIG. 1 , when the ball 13 is located in the recess 12 b, the opening 17 b is blocked by the ball 13, and the water pressure from the opening 17 b is not applied to the bypass passage 18. Fig. 10A In contrast to the situation of FIG. 1 , a water flow from the opening 17a toward the opening 17b is generated in the bypass passage 18 (see FIG. 1 ). Fig. 10C (right image).

[0115] The water flow in the bypass passage 18 pushes the ball 13 blocking the opening 17b away and enters the ball storage portion 11. The ball 13 moves toward the opening 17a on the guide groove 12 due to the water flow (see Fig. 10C left image).

[0116] The movement of the ball 13 is caused by the difference between two pressures applied to the bypass passage 18 through the openings 17 a and 17 b , so that the ball 13 reciprocates and slides spontaneously.

[0117] like Fig. 10A and Fig. 10CAs shown in FIG. 1 , the water jet from the discharge port 14 passes through the portion of the discharge port 14 that is not blocked by the sphere 13. At this time, the Coanda effect is exerted along the surface of the sphere 13. Therefore, the water jet is discharged in a direction bent toward the side where the sphere 13 is located. That is, when the sphere 13 is located in the concave portion 12a, the water jet is discharged in a direction bent toward the concave portion 12a (refer to FIG. 1 ). Fig. 10A When the ball 13 is located in the concave portion 12b, the water jet is discharged in a direction bent toward the concave portion 12b (see Fig. 10C ).

[0118] like Fig. 10B As shown in FIG. 1 , when the ball 13 is located at the center of the guide groove 12 during the reciprocating sliding process, the two water flows passing through the ball 13 in a manner that is separated by the ball 13 both flow obliquely along the surface of the ball 13 toward the center of the discharge port 14 due to the wall effect along the surface of the ball 13. The two water flows collide in the discharge port 14 and form a central axis C (refer to FIG. 1 ) of the ball storage portion 11 when viewed from the front. Figure 5 ) of the water jet.

[0119] In this way, if Fig. 10C As shown in FIG. 1 , the reciprocating sliding of the sphere 13 caused by the spontaneous vibration of the sphere 13 can cause the discharge direction of the water jet to swing. As a result, the discharge range of the water jet has a fan-shaped shape when viewed from the front (see FIG. 1 ). Fig. 10C left image).

[0120] In this embodiment, the central angle δ of the fan-shaped discharge range is approximately 70° to 90°. The central angle δ can be appropriately set by changing the reciprocating distance of the sphere 13, the size of the discharge port 14 in the X-axis direction, and the size of the discharge port 14 in the Z-axis direction.

[0121] (Implementation Method 2)

[0122] Hereinafter, the cleaning nozzle 5 of Embodiment 2 of the present invention will be described using the drawings. In this embodiment, the cleaning nozzle 5 is also a fixed nozzle 5b, 5c. The main structure of this embodiment is the same as that of Embodiment 1. The same reference numerals are given to the same or substantially the same components, and repeated descriptions are omitted.

[0123] Fig.11 is a central longitudinal sectional view of the nozzle 4, Fig.12 It is a central cross-sectional view of the nozzle 4. Figures 13A to 13C FIG. 4 is a cross-sectional view of the nozzle 4 schematically showing the movement of the sphere 13 and the water flow in the nozzle 4 of the present embodiment. Figures 13A to 13C In each of the drawings, the left figure is a longitudinal sectional view of the nozzle 4 , and the right figure is a plan sectional view of the nozzle 4 .

[0124] like Fig.11 and Fig.12As shown, similarly to the first embodiment, when viewed from the side, the guide groove 12 has a semicircular cross-section set by the offset dimension of the sphere diameter. In this embodiment, when viewed from the front, the guide groove 12 is inclined at a predetermined angle relative to the plane (i.e., the XY plane) perpendicular to the central axis C (i.e., the Z axis) of the internal space 11a of the sphere storage portion 11. The bypass passage 18 corresponds to the inclination of the guide groove 12 and is inclined similarly to the guide groove 12 when viewed from the front.

[0125] In the present embodiment, the inclination angle is about 4°. The inclination angle can be appropriately set according to the structure of the bypass passage 18 and the flow rate in the bypass passage 18 .

[0126] In the above structure, when the washing pump 3 starts to operate, the water pressurized by the washing pump 3 flows into the ball housing 11 from the inlet 16 through the water conduit 15 and is ejected from the outlet 14 to the washing tank 2 .

[0127] As in the first embodiment, when the cleaning pump 3 is stopped, the ball housing portion 11 is not filled with water (see Fig.9A In this case, the ball 13 is separated from the guide groove 12. When water flows from the inlet 16 into the ball housing 11, the ball 13 moves in the negative direction of the Z axis due to the water flow from the inlet 16 toward the outlet 14 and contacts the guide groove 12 (see Fig. 9B ).

[0128] In this embodiment, if Fig.11 As shown, the guide groove 12 is inclined at a predetermined angle relative to a plane (i.e., XY plane) perpendicular to the central axis C (i.e., Z axis) of the internal space 11a of the ball receiving portion 11. Therefore, the center of the ball 13 is closer to the discharge port 14 when the ball 13 is located in the recess 12b than when the ball 13 is located in the recess 12a.

[0129] That is, with respect to the water flow from the inlet 16 toward the outlet 14, the concave portion 12b of the guide groove 12 is located downstream of the concave portion 12a of the guide groove 12. As a result, when the operation of the cleaning pump 3 starts, the concave portion 12b of the guide groove 12 is located downstream of the concave portion 12a of the guide groove 12. Fig.9A The ball 13 in the state shown must first move toward the recess 12b (see Fig.13A ).

[0130] like Fig.13A As shown in FIG. 1 , when the ball 13 reaches the concave portion 12b of the guide groove 12, the ball 13 is in contact with one end portion of the guide groove 12 in the length direction connected to the concave portion 12b (at Fig.13A In this case, the opening 17b is blocked by the ball 13 (see Fig.11 As a result, water flows into the bypass passage 18 from the unblocked opening 17a, and the bypass passage 18 is filled with the water.

[0131] As described above, when the ball 13 is not in contact with any of the openings 17a and 17b (see Fig.9A ), static pressure is applied to the ball housing portion 11 from both the openings 17a and 17b inside the bypass passage 18, and the pressures from the two openings in the bypass passage 18 are balanced.

[0132] like Fig.13A As shown, when the opening 17b is blocked by the ball 13, the static pressure from the opening 17b is not applied to the bypass passage 18. Therefore, a difference occurs between the two pressures in the bypass passage 18, which are from the opening 17a and the opening 17b.

[0133] According to the pressure difference, water enters the bypass passage 18 from the opening 17a, and a water flow toward the opening 17b is generated in the bypass passage 18 (see Fig.13A The water flow in the bypass passage 18 pushes the ball 13 blocking the opening 17b away and enters the ball storage portion 11. The ball 13 moves toward the opening 17a on the guide groove 12 due to the water flow (see Fig.13A left image).

[0134] like Fig. 13C As shown in FIG. 1 , when the ball 13 is located in the recess 12a, the opening 17a is blocked by the ball 13, and the water pressure from the opening 17a is not applied to the bypass passage 18. Fig.13A In contrast to the situation of FIG. 1 , a water flow from the opening 17b toward the opening 17a is generated in the bypass passage 18 (see FIG. 1 ). Fig. 13C (right image).

[0135] The water flow in the bypass passage 18 pushes the ball 13 blocking the opening 17a away and enters the ball storage portion 11. The ball 13 moves toward the opening 17b on the guide groove 12 due to the water flow (see Fig. 13C left image).

[0136] The movement of the ball 13 is caused by the difference between two pressures applied to the bypass passage 18 through the openings 17 a and 17 b , so that the ball 13 spontaneously slides back and forth.

[0137] like Fig.13A and Fig. 13C As shown in FIG. 1 , the water jet from the discharge port 14 passes through the portion of the discharge port 14 that is not blocked by the sphere 13. At this time, the Coanda effect is exerted along the surface of the sphere 13. Therefore, the water jet is discharged in a direction that is bent toward the side where the sphere 13 is located. That is, when the sphere 13 is located in the concave portion 12b, the water jet is discharged in a direction that is bent toward the concave portion 12b side (refer to FIG. 1 ). Fig.13A When the ball 13 is located in the concave portion 12a, the water jet is discharged in a direction bent toward the concave portion 12a (see Fig. 13C).

[0138] like Fig. 13B As shown in FIG. 1 , when the ball 13 is located at the center of the guide groove 12 during the reciprocating sliding process, the two water flows passing through the ball 13 in a manner that is separated by the ball 13 both flow obliquely along the surface of the ball 13 toward the center of the discharge port 14 due to the wall effect along the surface of the ball 13. The two water flows collide in the discharge port 14 and form a central axis C (refer to FIG. 1 ) of the ball storage portion 11 when viewed from the front. Fig.11 ) of the water jet.

[0139] In this way, similarly to Embodiment 1, the discharge direction of the water jet stream can be swung by the reciprocating sliding of the sphere 13 due to the spontaneous vibration of the sphere 13. As a result, the discharge range of the water jet stream has a fan-shaped shape in front view.

[0140] According to the present embodiment, the guide groove 12 is inclined at a predetermined angle relative to a plane perpendicular to the central axis C of the internal space 11a of the ball housing portion 11. Therefore, when water starts to flow in, the ball 13 is bound to move to the concave portion 12b of the guide groove 12 located downstream of the water flow from the inlet 16 toward the outlet 14. As a result, a shower head 4 that starts to start earlier than in the first embodiment can be provided.

[0141] (Implementation method 3)

[0142] Hereinafter, the cleaning nozzle 5 of Embodiment 3 of the present invention will be described using the drawings. In this embodiment, the cleaning nozzle 5 is also a fixed nozzle 5b, 5c. The main structure of this embodiment is the same as that of Embodiment 1. The same reference numerals are given to the same or substantially the same components, and repeated descriptions are omitted.

[0143] Fig.14 is a central longitudinal sectional view of the nozzle 4, Fig.15 It is a central cross-sectional view of the nozzle 4. Figures 16A to 16C FIG. 4 is a cross-sectional view of the nozzle 4 schematically showing the movement of the sphere 13 and the water flow in the nozzle 4 of the present embodiment. Figures 16A to 16C In each of the drawings, the left figure is a longitudinal sectional view of the nozzle 4 , and the right figure is a plan sectional view of the nozzle 4 .

[0144] The guide groove 12 has the same structure as that of the first embodiment. Fig.14 and Fig.15 As shown, the guide groove 12 has a length direction along the X axis. The guide groove 12 has a cross section in a semicircular arc shape set with an offset dimension of the sphere diameter when viewed from the side.

[0145] In the present embodiment, the inlet 16 is a hole, and the center of the inlet 16 is located on the central axis C of the internal space 11a of the ball storage section 11. The ball storage section 11 has a barrier 19 that crosses the internal space 11a. The barrier 19 is a rod-shaped member that intersects the central axis C of the internal space 11a and extends in a width direction (i.e., the Y-axis direction) perpendicular to the length direction of the guide groove 12.

[0146] In the above structure, when the washing pump 3 starts to operate, the water pressurized by the washing pump 3 flows into the ball housing 11 from the inlet 16 through the water conduit 15 and is ejected from the outlet 14 to the washing tank 2 .

[0147] As in the first embodiment, when the cleaning pump 3 is stopped, the ball housing portion 11 is not filled with water (see Fig.9A In this case, the ball 13 is separated from the guide groove 12. When water flows from the inlet 16 into the ball housing 11, the ball 13 moves in the negative direction of the Z axis due to the water flow from the inlet 16 toward the outlet 14 and contacts the guide groove 12 (see Fig. 9B ).

[0148] For example, Fig.16A As shown in FIG. 1 , when the ball 13 reaches the concave portion 12a of the guide groove 12, the ball 13 is in contact with one end portion of the guide groove 12 in the length direction connected to the concave portion 12a (at Fig.16A In this case, the opening 17a is blocked by the ball 13 (see Fig.14 As a result, water flows into the bypass passage 18 from the unblocked opening 17b, and the bypass passage 18 is filled with the water.

[0149] When the ball housing 11 is filled with water, the water flow from the inlet 16 is blocked by the barrier 19 and cannot flow straight, and flows toward the outlet 14 through the left and right sides of the barrier 19. The left and right of the barrier 19 in this case refers to the positive direction and the negative direction of the X axis of the barrier 19.

[0150] At this time, Karman vortices are generated near the barrier 19. The Karman vortices are generated periodically and alternately on both sides of the barrier 19. The sphere 13 moves to the recess 12a or 12b of the guide groove 12 due to the Karman vortex, and blocks the opening 17a or 17b.

[0151] As described above, when the ball 13 is not in contact with any of the openings 17a and 17b (see Fig.9A ), static pressure is applied to the ball housing portion 11 from both the openings 17a and 17b inside the bypass passage 18, and the pressures from the two openings in the bypass passage 18 are balanced.

[0152] like Fig.16AAs shown, when the opening 17a is blocked by the ball 13, the static pressure from the opening 17a is not applied to the bypass passage 18. Therefore, a difference occurs between the two pressures in the bypass passage 18, which are from the opening 17a and the opening 17b.

[0153] According to the pressure difference, water enters the bypass passage 18 from the opening 17b, and a water flow toward the opening 17a is generated in the bypass passage 18 (see Fig.16A The water flow in the bypass passage 18 pushes away the ball 13 blocking the opening 17a and enters the ball storage portion 11. The ball 13 moves toward the opening 17b on the guide groove 12 due to the water flow and the Karman vortex (see Fig.16A left image).

[0154] like Fig. 16C As shown in FIG. 1 , when the ball 13 is located in the recess 12 b, the opening 17 a is blocked by the ball 13 and the water pressure from the opening 17 b is not applied to the bypass passage 18. Fig.16A In contrast to the situation of FIG. 1 , a water flow from the opening 17a toward the opening 17b is generated in the bypass passage 18 (see FIG. 1 ). Fig. 16C (right image).

[0155] The water flow in the bypass passage 18 pushes away the ball 13 blocking the opening 17b and enters the ball storage portion 11. The ball 13 moves toward the opening 17a on the guide groove 12 due to the water flow and the Karman vortex in the opposite direction to that just now (see Fig. 16C left image).

[0156] The movement of the spherical body 13 is caused by the difference between two pressures applied to the bypass passage 18 through the openings 17 a and 17 b and the Karman vortex generated by the barrier 19 , so that the spherical body 13 reciprocates and slides spontaneously.

[0157] like Fig.16A and Fig. 16C As shown in FIG. 1 , the water jet from the discharge port 14 passes through the portion of the discharge port 14 that is not blocked by the sphere 13. At this time, the Coanda effect is exerted along the surface of the sphere 13. Therefore, the water jet is discharged in a direction that is bent toward the side where the sphere 13 is located. That is, when the sphere 13 is located in the concave portion 12a, the water jet is discharged in a direction that is bent toward the concave portion 12a side (refer to FIG. 1 ). Fig.16A When the ball 13 is located in the concave portion 12b, the water jet is discharged in a direction bent toward the concave portion 12b (see Fig. 16C ).

[0158] like Fig. 16BAs shown in FIG. 1 , when the ball 13 is located at the center of the guide groove 12 during the reciprocating sliding process, the two water flows passing through the ball 13 in a manner that is separated by the ball 13 both flow obliquely along the surface of the ball 13 toward the center of the discharge port 14 due to the wall effect along the surface of the ball 13. The two water flows collide in the discharge port 14 and form a central axis C (refer to FIG. 1 ) of the ball storage portion 11 when viewed from the front. Fig.14 ) of the water jet.

[0159] In this way, similarly to Embodiment 1, the discharge direction of the water jet stream can be swung by the reciprocating sliding of the sphere 13 due to the spontaneous vibration of the sphere 13. As a result, the discharge range of the water jet stream has a fan-shaped shape in front view.

[0160] According to the present embodiment, when the water flow from the inlet 16 passes through the barrier 19, a Karman vortex is generated near the barrier 19. The sphere 13 moves along the guide groove 12 due to the Karman vortex and the two pressures applied to the bypass passage 18 via the openings 17a and 17b. As a result, it is possible to provide a nozzle 4 that starts up earlier than in the first embodiment.

[0161] In the conventional shower head, the water jet from the discharge port is sometimes diffused into a fan shape according to the shape of the discharge port. In the case of such a shower head, since the water jet collides with the tableware in a uniformly diffused state, the collision force of the water jet per unit area of ​​the tableware becomes small.

[0162] like Fig. 20 As shown, in the structure of the conventional nozzle, a part of the discharge port is covered by a sphere rotating on a circular orbit, so that the spray water flow in the inclined direction can be swirled, and the range covered by the spray water flow can be formed into a cone shape.

[0163] In order to make the ball revolve near the discharge port, the conventional nozzle needs a cylindrical portion extending along the central axis of the discharge port and defining the revolving track of the ball. Therefore, it is difficult to increase the inclination angle of the water jet and to expand the range of the water jet.

[0164] According to the above-mentioned embodiments 1 to 3, the direction of the water jet is swung to change the position of the tableware that the water jet hits, thereby expanding the range of the water jet. Thus, even if the range of the water jet that hits the tableware is the same, a higher collision force than that of the conventional nozzle can be obtained. As a result, the dirt on the tableware can be removed efficiently.

[0165] As described above, according to the first to third embodiments, it is possible to efficiently spray the jet stream onto the tableware arranged in the limited space of the tableware basket.

[0166] Fig.173 is a perspective view of a rotating nozzle 5a of a dishwasher 1 according to embodiments 1 to 3. In embodiments 1 to 3, the cleaning nozzle 5 is a fixed nozzle 5b, 5c for cleaning the dishes in the upper tableware basket 6 and the middle tableware basket 7 respectively arranged in the dishwasher 1. Fig.17 As shown, the nozzle head 4 of the present invention can be applied to the rotating nozzle 5a for washing the tableware arranged in the lower tableware basket 8. In this case, the same effects as those of the first to third embodiments can be obtained.

[0167] (Other embodiments)

[0168] As described above, the above-mentioned embodiments 1 to 3 are described as examples of the technology of the present invention. However, the technology of the present invention is not limited to the above-mentioned embodiments, and can also be applied to embodiments obtained by changing, replacing, adding, omitting, etc. the above-mentioned embodiments. It is also possible to combine the constituent elements described in the above-mentioned embodiments to form a new embodiment.

[0169] Other embodiments are described below.

[0170] In Embodiments 1 to 3, the description is mainly about a cleaning nozzle of a dishwasher for cleaning dishes. In addition, the technology of the present embodiment can be applied to a cleaning device for any purpose.

[0171] As described above, the cleaning nozzle of the present invention can be applied to not only dishwashers but also professional washing machines, washing machines for other objects to be washed, and washing toilet seats.

Claims

1. A cleaning nozzle comprising a nozzle configured to spray cleaning water supplied via a water conduit into a cleaning tank, wherein: The nozzle comprises: a ball storage portion having an inner space surrounded by a wall surface facing the water conduit, a wall surface facing the cleaning tank, and a cylindrical side wall; an inlet disposed on the wall surface facing the water conduit so as to allow the ball housing portion to communicate with the water conduit; and The discharge port is elliptical in shape and is disposed on the wall surface facing the cleaning tank so that the ball storage portion and the cleaning tank are connected. The ball receiving portion comprises: a sphere capable of moving within the interior of the interior space; a guide groove having an elliptical shape, arranged on the side of the wall surface of the cleaning tank facing the inner space, and having an opening in the center thereof communicating with the discharge port; a bypass passage which is an annular water passage disposed inside the side wall; and Two openings, one each disposed on opposite sides of the bypass passage, connect the bypass passage and the ball housing portion. When the ball is in contact with both ends of the guide groove in the longitudinal direction, the corresponding opening of the two openings is blocked by the ball.

2. The cleaning nozzle according to claim 1, wherein: The inlet has a center located on the central axis of the internal space of the ball housing portion.

3. The cleaning nozzle according to claim 1, wherein: The two openings respectively connect corresponding ends of both ends of the guide groove in the longitudinal direction with the bypass passage.

4. The cleaning nozzle according to claim 1, wherein: The guide groove is configured so that the ball can reciprocate along the guide groove. When the ball abuts against both ends of the guide groove in the longitudinal direction, the ball abuts against the side wall of the ball housing portion near the corresponding openings of the two openings.

5. The cleaning nozzle according to claim 1, wherein: The guide groove has two recessed portions arranged along the longitudinal direction of the guide groove, When the ball is in contact with both ends of the guide groove in the length direction, the ball is located in the corresponding recessed portion of the two recessed portions. The two concave portions of the guide groove each have a curved shape protruding toward the discharge port.

6. The cleaning nozzle according to claim 1, wherein: The guide groove is inclined at a predetermined angle with respect to a plane perpendicular to a central axis direction of the internal space.

7. The cleaning nozzle according to claim 1, wherein: The ball storage portion further includes a barrier wall that is disposed in the inner space near the inlet port rather than the outlet port and is perpendicular to the longitudinal direction of the guide groove.

8. A dishwashing machine, wherein: The dishwasher comprises: A cleaning tank configured to receive objects to be cleaned; a washing pump configured to pressurize washing water; and The cleaning nozzle according to any one of claims 1 to 7.

Images