A spray arm mechanism

Abstract

The application relates to the technical field of spray arms, in particular to a spray arm mechanism and a spray arm mechanism, which comprises a first spray arm internally provided with a first water flow channel; a second spray arm internally provided with a second water flow channel communicated with the first water inlet, wherein the second spray arm is arranged below the first spray arm, one side of the second spray arm is provided with a connecting joint, the connecting joint is internally formed with a water inlet channel communicated with the second water flow channel; wherein a first connecting structure is arranged at the first water inlet, a second connecting structure is arranged at the water outlet, and the first connecting structure and the second connecting structure are matched with each other and used for limiting the relative rotation between the first spray arm and the second spray arm; in this way, the rotation jamming of the connecting position of the first spray arm and the second spray arm caused by long-term abrasion and the water leakage problem caused by sealing failure are eliminated.

Description

Technical Field

[0001] This utility model relates to the field of spray arm technology, and in particular to a spray arm mechanism. Background Technology

[0002] Nowadays, more and more families are using dishwashers to wash kitchenware to reduce the burden of housework. The working principle of a dishwasher is generally to introduce water into the inner tank, heat it, add detergent, and then use a washing pump to pump the water into the spray pipe for washing. After washing, the water is drained by a drain pump.

[0003] The spray arm is an essential component of a dishwasher. Most household dishwashers use a water pump to draw water into the inner tub for heating. The hot water is then drawn by a wash pump to the spray arm. The water flow passes through the thrust holes of the spray arm, giving it the driving force to rotate. The high-temperature water jets sprayed by the rotating spray arm decompose and disinfect the grease and dirt on the dishes, chopsticks, knives, forks, spoons, and other tableware in the dishwasher.

[0004] Patent No. 202122453014.7 discloses a double-layer spray arm assembly and its dishwasher. This patent arranges a second spray arm and a first spray arm vertically spaced, with the second spray arm securely connected to the lower end of a connecting block. The first spray arm is rotatably connected to the lower end of the connecting block via a first rotating shaft, allowing the second spray arm to rotate horizontally relative to the first. This creates a double-layer spray arm effect, enabling diverse rotation and resulting in more direct spray positions and angles, thus improving washing efficiency. However, in this patent, the first spray arm rotates relative to the connecting block while the second spray arm is fixed to it, forming a "one moving, one stationary" structure. Over long-term operation, the corresponding rotating shaft and gaskets are prone to wear and aging, potentially leading to inflexible rotation or leaks. Utility Model Content

[0005] In view of the shortcomings or problems existing in the prior art, this disclosure provides a spray arm mechanism, which has a simple structure and stable and reliable operation.

[0006] The technical solution adopted by this disclosure to solve the above-mentioned technical problem is: a spray arm mechanism, comprising: The first spray arm has a first water flow channel inside, a first water inlet connected to the first water flow channel on one side of the first spray arm, and a plurality of first spray holes on the other side. The second spray arm has a second water flow channel inside that is connected to the first water inlet. The second spray arm is located below the first spray arm. A connecting joint is provided on one side of the second spray arm. A water inlet channel is formed inside the connecting joint and is connected to the second water flow channel. The other side of the second spray arm has a water outlet connected to the second water flow channel and several second spray holes. The first water inlet is provided with a first connecting structure, and the water outlet is provided with a second connecting structure. The first connecting structure and the second connecting structure cooperate with each other to limit the relative rotation between the first spray arm and the second spray arm.

[0007] In a preferred embodiment, the first water inlet is a circular hole, and the inner peripheral wall of the circular hole is provided with two recessed sections opposite each other along the circumference. A strip-shaped protrusion and a stop are provided in the recessed section. The strip-shaped protrusion extends along the circumference of the recessed section, and the stop is provided on the strip-shaped protrusion and is located above the strip-shaped protrusion. The recessed section, the strip-shaped protrusion and the stop constitute a first connecting structure.

[0008] In a preferred embodiment, the length of the strip-shaped protrusion extending circumferentially is less than the length of the recessed section. The strip-shaped protrusion includes a first section and a second section connected end to end. The stop block is disposed in the second section, and the upper surface of the first section is constructed with a first guide surface.

[0009] In a preferred embodiment, the stop includes a first inclined surface and a second inclined surface. An arc-shaped transition surface is provided at the connection between the first inclined surface and the second inclined surface. The angle between the first inclined surface and the inner wall of the recessed section is an obtuse angle. The angle between the first inclined surface and the inner wall of the recessed section is greater than the angle between the second inclined surface and the inner wall of the recessed section. The second inclined surface and the end side wall of the recessed section enclose each other to form a limited concave shape.

[0010] In a preferred embodiment, the second connecting structure is disposed on the side of the water outlet near the first spray arm. The second connecting structure includes two first connecting blocks and two second connecting blocks. The first connecting blocks and the second connecting blocks are arranged alternately and at intervals along the circumference of the water outlet. The first connecting blocks are engaged with the limiting recess to restrict the relative rotation between the first spray arm and the second spray arm.

[0011] In a preferred embodiment, the first connecting block includes a base and a limiting portion disposed on the base, the limiting portion extending radially outward and engaging with a limiting recess.

[0012] In a preferred embodiment, the base and the limiting part are integrally formed, and the outer side of the limiting part has a second guide surface; the second connecting block is a strip-shaped arc structure.

[0013] In a preferred embodiment, the first spray arm includes an upper housing and a lower housing, which are welded together. The first spray hole is disposed on the upper housing, the first water inlet is disposed on the lower housing, and the first water flow channel is formed between the upper housing and the lower housing. An expansion channel is also provided between the upper housing and the lower housing, which is arranged around the first water flow channel. An overflow port is provided on the expansion channel.

[0014] In a preferred embodiment, the upper housing is detachably connected to a decorative cover, the decorative cover is provided with multiple buckles, and the upper housing is provided with multiple corresponding slots, the buckles and slots cooperating to connect the decorative cover to the upper housing.

[0015] In a preferred embodiment, the lower end of the side wall of the upper shell is provided with a first oblique cut structure, and the upper end of the side wall of the lower shell is provided with a second oblique cut structure that is adapted to the first oblique cut structure. The inner side of the side wall of the upper shell is also provided with a downwardly extending convex ridge structure, and the outer side wall of the convex ridge structure is in contact with the inner side wall of the lower shell.

[0016] Compared with the prior art, the beneficial effects of this utility model are: since the first spray arm and the second spray arm do not rotate relative to each other during the spraying process, the problem of rotation jamming caused by long-term wear at the connection between the first spray arm and the second spray arm and the water leakage caused by sealing failure are fundamentally eliminated; the first spray arm and the second spray arm are connected by the first connection structure and the second connection structure, which eliminates the need for additional connecting parts, reduces the complexity of assembly, and simplifies the structure of the spray arm mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a spray arm mechanism according to this application; Figure 2 This is an exploded view of a spray arm mechanism according to this application; Figure 3 For this application Figure 2 A magnified view of the middle V section; Figure 4 This is a schematic diagram of the structure of the shell in this application; Figure 5 This is a schematic diagram of the structure of the decorative cover of this application; Figure 6 This is one of the structural schematic diagrams of the lower shell of this application; Figure 7 For this application Figure 6 A magnified view of a section at point A in the middle; Figure 8 This is the second structural schematic diagram of the lower shell of this application; Figure 9 For this application Figure 8 A magnified view of a section at point B in the middle; Figure 10 This is one of the cross-sectional views of a spray arm mechanism according to this application; Figure 11 For this application Figure 10 A magnified view of a section at point C; Figure 12 This is a second cross-sectional view of a spray arm mechanism according to this application; Figure 13 For this application Figure 12 A magnified view of a section at point D.

[0018] In the diagram: 100, First spray arm; 101, First water flow channel; 102, First spray hole; 103, First water inlet; 105, Strip-shaped protrusion; 106, Stop block; 107, First inclined surface; 108, Second inclined surface; 109, Limiting recess; 110, First guide surface; 111, Notch; 112, Upper housing; 113, Lower housing; 114, Decorative cover; 115, Widened channel; 116, Overflow. 117. Outlet; 118. Buckle; 119. Slot; 120. First oblique section structure; 121. Second oblique section structure; 122. Raised ridge structure; 200. Second spray arm; 201. Second water flow channel; 202. Connecting joint; 203. Outlet; 204. First connecting block; 205. Second connecting block; 206. Base; 207. Limiting part; 208. Second guide surface; 209. Second spray hole. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0020] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0021] Please refer to Figures 1-3As shown, this application discloses a spray arm mechanism, including a first spray arm 100 and a second spray arm 200. The first spray arm 100 and the second spray arm 200 are either straight or Z-shaped spray arms, and are arranged in a roughly crisscross pattern. The first spray arm 100 has a first water flow channel 101 inside, a first water inlet 103 connected to the first water flow channel 101 on one side, and a plurality of first spray holes 102 on the other side. The second spray arm 200 has a second water flow channel 201 connected to the first water inlet 103 inside, and is located below the first spray arm 100. A connecting joint 202 is provided on one side of the arm 200, and a water inlet channel is formed inside the connecting joint 202. The water inlet channel is connected to the second water flow channel 201. The other side of the second spray arm 200 is provided with a water outlet 203 connected to the second water flow channel 201 and several second spray holes 209. The axis of the water inlet channel, the axis of the first water inlet 103 and the axis of the water outlet 203 are on the same straight line. A first connecting structure is provided at the first water inlet 103 and a second connecting structure is provided at the water outlet 203. The first connecting structure and the second connecting structure cooperate with each other to limit the relative rotation between the first spray arm 100 and the second spray arm 200. Since the first spray arm 100 and the second spray arm 200 do not rotate relative to each other during the spraying process, the problem of rotation jamming caused by long-term wear and leakage caused by seal failure at the connection between the first spray arm 100 and the second spray arm 200 is fundamentally eliminated. The first spray arm 100 and the second spray arm 200 are connected by the first connection structure and the second connection structure, which eliminates the need for additional connecting parts, reduces the complexity of assembly, and simplifies the structure of the spray arm mechanism.

[0022] For details, please refer to Figure 3 , Figures 6-11As shown, the first inlet 103 is a circular hole. Two recessed sections are arranged circumferentially opposite each other on the inner wall of the circular hole. A strip-shaped protrusion 105 and a stop 106 are arranged within each recessed section. The strip-shaped protrusion 105 extends circumferentially along the recessed section, and the stop 106 is located on the strip-shaped protrusion 105 and above it. The recessed sections, the strip-shaped protrusion 105, and the stop 106 constitute the first connecting structure. The stop 106 includes a first inclined surface 107 and a second inclined surface 108. The second inclined surface 108 and the end sidewall of the recessed section enclose a limiting recess 109. The length of the strip-shaped protrusion 105 extending circumferentially is less than the length of the recessed section. The strip-shaped protrusion 105 includes a first section and a second section connected end to end, and the first section and the second section are integrally formed. The stop block 106 is provided on the second section. The upper surface of the first section is constructed with a first guide surface 110. Specifically, the first guide surface 110 is an inclined surface. The first guide surface 110 can provide a smooth guide for the first connecting block 204, which is convenient for assembly. When the spraying mechanism is working, under the action of water flow, the first spray arm 100 and the second spray arm 200 rotate synchronously. The stop block 106 is used to limit the first connecting block 204 circumferentially, preventing the first spray arm 100 and the second spray arm 200 from separating during the spraying process. The second connecting structure is located on the side of the outlet 203 near the first spray arm 100, protruding towards the first spray arm 100. The second connecting structure includes two first connecting blocks 204 and two second connecting blocks 205. The first connecting blocks 204 and second connecting blocks 205 are arranged alternately and at intervals along the circumference of the outlet 203. The first connecting blocks 204 cooperate with the limiting recess 109 to limit the relative rotation between the first spray arm 100 and the second spray arm 200. The second connecting blocks 205 are strip-shaped arc structures, their shape matching the edge contour of the outlet 203. The first connecting block 204 includes a base 206 and a limiting portion 207 provided on the base 206. The base 206 and the limiting portion 207 are integrally formed. The base 206 is connected to the end face of the outlet 203. The limiting portion 207 extends radially outward and cooperates with the limiting recess 109.

[0023] It is understood that a notch 111 is provided between the free end of the first segment and the end of the adjacent recessed segment. This notch 111 facilitates the entry of the first connecting block 204 into the first connecting structure. During assembly, the first connecting block 204 enters through the notch 111. By rotating the first spray arm 100 or the second spray arm 200, the limiting part 207 of the first connecting block 204 enters above the strip-shaped protrusion 105 along the first guide surface 110. When the limiting part 207 passes the stop 106 and enters the limiting recess 109, the first connecting block 204 is in a locked state. At this time, the first spray arm 100 cannot rotate relative to the second spray arm 200. Preferably, an arc-shaped transition surface is provided at the connection between the first inclined surface 107 and the second inclined surface 108 of the stop 106. The angle between the first inclined surface 107 and the inner wall of the recessed segment is an obtuse angle, and the angle between the first inclined surface 107 and the inner wall of the recessed segment is greater than the angle between the second inclined surface 108 and the inner wall of the recessed segment. The first inclined surface 107 is relatively gentle, allowing the limiting part 207 to easily pass over the stop 106 and enter the limiting recess 109. The second inclined surface 108, however, has a steeper slope, providing better "interception" and reliably limiting the limiting part 207 within the limiting recess 109. This makes it easy for the limiting part 207 to enter but difficult to exit, preventing it from detaching in the opposite direction. Consequently, a significant force (manually tightening) is required to dislodge the limiting part 207 from the limiting recess 109, effectively preventing the spray arm mechanism from accidentally loosening due to vibration or water pressure fluctuations.

[0024] Please continue reading. Figure 2 , Figure 3 , Figure 8 and Figure 9 As shown, to further facilitate assembly, the outer side of the limiting part 207 has a second guide surface 208, specifically, the second guide surface 208 is an inclined surface. The provision of the second guide surface 208 allows the limiting part 207 to smoothly pass over the stop 106 and enter the limiting recess 109 when passing the stop 106. The second guide surface 208 and the first inclined surface 107 work together to form a double guide, guiding the limiting part 207 smoothly into the limiting recess 109.

[0025] like Figure 2 and Figure 6As shown, in one embodiment of this disclosure, the first spray arm 100 includes an upper housing 112 and a lower housing 113, which are welded together. A first spray hole 102 is disposed on the upper housing 112, and a first water inlet 103 is disposed on the lower housing 113. A first water flow channel 101 is formed between the upper housing 112 and the lower housing 113. An expansion channel 115 is also disposed between the upper housing 112 and the lower housing 113, surrounding the periphery of the first water flow channel 101. An overflow port 116 is provided on the expansion channel 115. The expansion channel 115 is separated from the first water flow channel 101. Under normal circumstances, the expansion channel 115 is in an empty state, and water is not allowed inside it. The overflow port 116 is disposed on the lower housing 113. Once water enters the expansion channel 115, the water inside is discharged from the overflow port 116. If the entire cavity between the upper housing 112 and the lower housing 113 is used as the first water flow channel 101, the entire first spray arm 100 will be filled with water during the water supply phase, making the first spray arm 100 very heavy. Combined with the weight of the second spray arm 200, the spray arm mechanism is prone to jamming or becoming unable to rotate due to excessive weight. Providing a widened channel 115 can limit the water storage capacity of the first water flow channel 101, preventing jamming caused by excessive weight in the spray arm mechanism.

[0026] Furthermore, such as Figure 4 and Figure 5 As shown, a decorative cover 114 is detachably connected to the upper housing 112. The decorative cover 114 has multiple snap-fit ​​fasteners 117, and the upper housing 112 has corresponding slots 118. The snap-fit ​​fasteners 117 and slots 118 engage to connect the decorative cover 114 to the upper housing 112. The decorative cover 114 and the upper cover are connected by a snap-fit ​​mechanism, making assembly more convenient. After the decorative cover 114 is connected to the upper housing 112, the upper housing 112 is then welded to the lower housing 113 to ensure a tight seal.

[0027] Specifically, please see Figure 12 and Figure 13 As shown, the sidewalls of the upper housing 112 and the lower housing 113 are provided with a double sealing structure. Specifically, the lower end of the sidewall of the upper housing 112 has a first oblique cut structure 119, and the upper end of the sidewall of the lower housing 113 has a second oblique cut structure 120 that matches the first oblique cut structure 119. When the two are joined, they fit together to achieve the first seal. In addition, the inner side of the sidewall of the upper housing 112 is integrally formed with a downwardly extending convex ridge structure 121. After the upper housing 112 and the lower housing 113 are assembled together, the outer sidewall of the convex ridge structure 121 fits against the inner sidewall of the lower housing 113 to form a tight surface contact, achieving the second seal. In this way, water leakage in the first water flow channel 101 can be effectively prevented.

[0028] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A spray arm mechanism, characterized in that, include: The first spray arm (100) has a first water flow channel (101) inside. One side of the first spray arm (100) is provided with a first water inlet (103) connected to the first water flow channel (101), and the other side is provided with a plurality of first spray holes (102). The second spray arm (200) has a second water flow channel (201) inside which is connected to the first water inlet (103). The second spray arm (200) is located below the first spray arm (100). A connecting joint (202) is provided on one side of the second spray arm (200). A water inlet channel is formed inside the connecting joint (202) and is connected to the second water flow channel (201). The other side of the second spray arm (200) is provided with a water outlet (203) connected to the second water flow channel (201) and a number of second spray holes (209). The first inlet (103) is provided with a first connecting structure, and the outlet (203) is provided with a second connecting structure. The first connecting structure and the second connecting structure cooperate with each other to restrict the relative rotation between the first spray arm (100) and the second spray arm (200).

2. The spray arm mechanism according to claim 1, characterized in that, The first water inlet (103) is a circular hole. The inner circumferential wall of the circular hole is provided with two recessed sections opposite each other along the circumferential direction. A strip-shaped protrusion (105) and a stop (106) are provided in the recessed section. The strip-shaped protrusion (105) extends along the circumferential direction of the recessed section. The stop (106) is provided on the strip-shaped protrusion (105) and is located above the strip-shaped protrusion (105). The recessed section, the strip-shaped protrusion (105) and the stop (106) constitute the first connecting structure.

3. The spray arm mechanism according to claim 2, characterized in that, The length of the strip-shaped protrusion (105) extending circumferentially is less than the length of the recessed section. The strip-shaped protrusion (105) includes a first section and a second section connected end to end. The stop block (106) is located in the second section. The upper surface of the first section is constructed with a first guide surface (110).

4. The spray arm mechanism according to claim 2, characterized in that, The stop block (106) includes a first inclined surface (107) and a second inclined surface (108). An arc-shaped transition surface is provided at the connection between the first inclined surface (107) and the second inclined surface (108). The angle between the first inclined surface (107) and the inner wall of the recessed section is an obtuse angle. The angle between the first inclined surface (107) and the inner wall of the recessed section is greater than the angle between the second inclined surface (108) and the inner wall of the recessed section. The second inclined surface (108) and the end side wall of the recessed section enclose each other to form a limited recess (109).

5. The spray arm mechanism according to claim 4, characterized in that, The second connection structure is located on the side of the outlet (203) near the first spray arm (100). The second connection structure includes two first connection blocks (204) and two second connection blocks (205). The first connection blocks (204) and the second connection blocks (205) are arranged alternately and at intervals along the circumference of the outlet (203). The first connection block (204) cooperates with the limiting recess (109) to limit the relative rotation between the first spray arm (100) and the second spray arm (200).

6. The spray arm mechanism according to claim 5, characterized in that, The first connecting block (204) includes a base (206) and a limiting part (207) provided on the base (206). The limiting part (207) extends radially outward and cooperates with the limiting recess (109).

7. The spray arm mechanism according to claim 6, characterized in that, The base (206) and the limiting part (207) are integrally formed, and the outer side of the limiting part (207) has a second guide surface (208); the second connecting block (205) is a strip-shaped arc structure.

8. The spray arm mechanism according to claim 1, characterized in that, The first spray arm (100) includes an upper housing (112) and a lower housing (113), which are welded together. The first spray hole (102) is disposed on the upper housing (112), and the first water inlet (103) is disposed on the lower housing (113). The first water flow channel (101) is formed between the upper housing (112) and the lower housing (113). An expansion channel (115) is also provided between the upper housing (112) and the lower housing (113). The expansion channel (115) is arranged around the first water flow channel (101), and an overflow port (116) is provided on the expansion channel (115).

9. The spray arm mechanism according to claim 8, characterized in that, The upper housing (112) is detachably connected to a decorative cover (114). The decorative cover (114) is provided with multiple buckles (117), and the upper housing (112) is provided with multiple slots (118). The buckles (117) and slots (118) cooperate to connect the decorative cover (114) to the upper housing (112).

10. The spray arm mechanism according to claim 8, characterized in that, The lower end of the side wall of the upper shell (112) is provided with a first oblique surface structure (119), and the upper end of the side wall of the lower shell (113) is provided with a second oblique surface structure (120) adapted to the first oblique surface structure (119). The inner side of the side wall of the upper shell (112) is also provided with a downwardly extending convex rib structure (121), and the outer side wall of the convex rib structure (121) is attached to the inner side wall of the lower shell (113).

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