Spraying arm for cleaning machine and cleaning machine

Abstract

The spraying arm comprises a body, the interior of the body is hollow to form a flow channel extending in the length direction, a plurality of water spraying holes communicated with the flow channel are formed in the top wall of the body, and a water inlet communicated with the flow channel is formed in the center of the bottom wall of the body. Sliding blocks which can rotate along with the spraying arm and slide towards the corresponding ends of the body under the action of centrifugal force are arranged on the body on the two sides of the water inlet respectively, and elastic pieces which can enable the sliding blocks to keep the reset trend are further arranged on the body. When the rotating speed of the spraying arm is too high, the sliding block moves towards the end of the spraying arm, the rotational inertia and the load of the spraying arm are increased, and therefore rotation of the spraying arm can be slowed down; when the rotating speed of the spraying arm is too low, the sliding block moves towards the middle of the spraying arm under the action of the elastic piece, the rotational inertia and the load of the spraying arm are reduced, rotation of the spraying arm can be accelerated, self-adaption of the rotating speed of the spraying arm is achieved, the rotating speed stability of the spraying arm is improved, and then the cleaning effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a spray arm for a washing machine and a washing machine. Background Art

[0002] As people's living standards improve, dishwashers, as a kitchen appliance, are increasingly entering households. Spray arms are provided in dishwashers to spray water onto the surface of tableware to achieve large-area spray cleaning.

[0003] The "Spray Arm and Cleaning Machine for Cleaning Machine" (application number: CN202222667424.6) with authorization announcement number CN218684284U discloses a structure including a spray arm body, on which a water spray hole and a guide sleeve extending from the edge of the water spray hole in the direction of water flow are provided, the middle part of the guide sleeve contracts radially to form a contraction part with a reduced inner diameter, and a suction hole connected to the contraction part is provided on the side wall of the guide sleeve. The above scheme utilizes the contraction part of the guide sleeve to generate local negative pressure, thereby sucking air into the water column through the suction hole, so that bubbles are entrained in the sprayed water flow, and when the water flow with bubbles is sprayed toward the dishes, the bubbles in the water flow contact the dishes and burst and generate a large impact force, thereby dispersing the stubborn dirt on the dishes or fruits and vegetables, and achieving a better cleaning effect.

[0004] However, the rotation speed of the above-mentioned spray arm is driven by a constant number of water spray holes. The driving force will tend to decrease as the density of the medium decreases. Depending on the cleaning environment, the constant water spray holes may also be partially blocked, which makes the rotation speed of the spray arm unstable during the cleaning process, greatly affecting the cleaning effect. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a spray arm for a cleaning machine which can realize self-adaptation of rotation speed and improve rotation speed stability and cleaning effect in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a cleaning machine using the above-mentioned spray arm in view of the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve at least one of the above technical problems is:

[0008] A spray arm for a cleaning machine, comprising a body. The interior of the body is hollow to form a flow channel extending along the length direction. A plurality of water spray holes communicating with the flow channel are formed in the top wall of the body. An inlet communicating with the flow channel is formed in the central part of the bottom wall of the body. Sliders capable of sliding towards the corresponding ends of the body under the action of centrifugal force as the spray arm rotates are respectively arranged on the body on both sides of the inlet. An elastic member capable of keeping the sliders in a reset trend is further arranged on the body.

[0009] Preferably, the slider has a U-shaped structure. The horizontal part of the U-shaped structure is arranged close to the bottom wall of the body, and the two vertical parts of the U-shaped structure are respectively arranged close to the two side walls of the body. The elastic member is arranged at the bottom of the body and elastically connected to the horizontal part of the U-shaped structure. With such a structure, it is convenient to guide and cooperate the slider with the body, so that the slider can slide a displacement adapted to the corresponding centrifugal force as the rotation speed of the spray arm changes, for adjusting the rotation speed of the spray arm.

[0010] Preferably, a guiding column extending along the length direction is arranged on the bottom wall of the body. A limiting hole capable of sleeving on the outer periphery of the guiding column and guidingly cooperating with it is arranged on the horizontal part of the U-shaped structure. The above-mentioned guiding columns are in two groups and arranged side by side in the width direction of the body. This structure is convenient for constraining the slider on the body to prevent it from detaching from the body. At the same time, it improves the reliability of the sliding cooperation between the slider and the body.

[0011] Preferably, a first elastic member is sleeved on the guiding column on the left side of the slider, and a second elastic member is sleeved on the guiding column on the right side of the slider. A first limiting block for limiting the first elastic member is arranged at the first end of the guiding column, and a second limiting block for limiting the second elastic member is arranged at the second end of the guiding column. The above-mentioned first elastic member and second elastic member are both linear springs, and they respectively provide the elastic force for the balance and reset of the slider.

[0012] Preferably, a guiding inclined surface inclined downward and outward is formed at the edge where the body is connected to its side wall. The upper end of the vertical part of the U-shaped structure gradually extends inward from bottom to top to form an inclined part cooperating with the guiding inclined surface. This structure can enhance the reliability of the cooperation between the body and the slider, and prevent the upper end of the slider from loosening relative to the body and affecting the closing effect of the following spray holes.

[0013] Preferably, a plurality of injection holes that can be covered or exposed as the slider slides are formed in the side wall of the main body, and the plurality of injection holes are arranged at intervals in the length direction on the side wall of the main body. When the rotation speed of the spray arm is too high, while the slider moves towards the end of the main body under the action of large centrifugal force, the jet area of the injection holes is reduced by blocking, so as to reduce the rotation speed of the spray arm from two aspects: increasing the load as the slider moves from the slider towards the end of the main body and reducing the power by reducing the jet area of the injection holes; when the rotation speed of the spray arm is too slow, similarly, the rotation speed of the spray arm is increased from two aspects of reducing the load and increasing the power, thereby realizing the adaptive adjustment of the rotation speed of the spray arm.

[0014] Preferably, a convex block is convexly provided on the inner side of the vertical part of the U-shaped structure so as to be relatively close to the side wall of the main body and arranged close to the peripheral part of the injection hole. This structure can make the sealing of the injection hole by the side wall of the slider more reliable and avoid local water leakage.

[0015] Preferably, a first acceleration hole communicating with the flow channel and arranged close to the first end of the main body is formed in the first side wall of the main body, and a second acceleration hole communicating with the flow channel and arranged close to the second end of the main body is formed in the second side wall of the main body. Preferably, the matching structure of the slider and the elastic member is two groups and is symmetrically arranged with respect to the water inlet. The above structure is beneficial to better control the rotational stability of the spray arm.

[0016] A cleaning machine includes a box body, a concave return water area is arranged at the bottom of the box body, a filter plate is arranged at the top of the return water area, and further includes the above-mentioned spray arm, which is rotatably arranged in the box body and above the filter plate, and a water pump for pumping the water in the return water area to the spray arm through the water inlet is arranged in the return water area.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The present invention respectively arranges a slider that can slide relative to the main body and an elastic member for driving the slider to reset on both sides of the water inlet of the spray arm. The slider can slide outwards under the action of centrifugal force as the spray arm rotates. When the rotation speed of the spray arm is too fast, the slider moves towards the end of the spray arm, increasing the moment of inertia and load of the spray arm, so that the spray arm can rotate more slowly; when the rotation speed of the spray arm is too slow, the slider moves towards the middle of the spray arm under the action of the elastic member, reducing the moment of inertia and load of the spray arm, and enabling the spray arm to rotate faster, realizing the self-adaptation of the rotation speed of the spray arm, which is beneficial to improving the rotation speed stability of the spray arm and further improving the cleaning effect. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the spray arm according to an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a schematic diagram from another angle;

[0020] Figure 3 It is a cross-sectional view of the spray arm according to an embodiment of the present utility model;

[0021] Figure 4 It is a bottom view of the spray arm according to an embodiment of the present utility model. Specific embodiments

[0022] The present utility model will be further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0023] As Figures 1 to 4 shown, the spray arm for a cleaning machine in this embodiment includes a body 1. The interior of the body 1 is hollow to form a flow channel 11 extending along the length direction. A plurality of water spraying holes 12 communicating with the flow channel 11 are provided on the top wall of the body 1, and a water inlet 13 communicating with the flow channel 11 is provided in the central part of the bottom wall of the body 1. Sliders 2 capable of sliding towards the corresponding ends of the body 1 under the action of centrifugal force as the spray arm rotates are respectively provided on the body 1 on both sides of the water inlet 13, and an elastic member 3 capable of keeping the sliders 2 in a reset trend is further provided on the body 1.

[0024] The above-mentioned slider 2 has a U-shaped structure. The transverse part 21 of the U-shaped structure is arranged close to the bottom wall of the body 1, and the two vertical parts 22 of the U-shaped structure are respectively arranged close to the two side walls of the body 1. The elastic member 3 is arranged at the bottom of the body 1 and is elastically connected to the transverse part 21 of the U-shaped structure. With such a structure, it is convenient to guide and cooperate the slider 2 with the body 1, so that the slider 2 can slide a displacement adapted to the corresponding centrifugal force as the rotation speed of the spray arm changes, for adjusting the rotation speed of the spray arm.

[0025] A guiding column 14 extending along the length direction is provided on the bottom wall of the body 1, and a limiting hole 211 capable of sleeving on the outer periphery of the guiding column 14 and guidingly cooperating with it is provided on the transverse part 21 of the U-shaped structure. The above-mentioned guiding columns 14 are in two groups and are arranged side by side in the width direction of the body 1. This structure is convenient for restricting the slider on the body 1 to prevent it from detaching from the body 1. At the same time, the reliability of the sliding cooperation between the slider 2 and the body 1 is improved.

[0026] The elastic member 3 includes a first elastic member and a second elastic member. A first elastic member is sleeved on the guide post 14 located on the left side of the slider 2, and a second elastic member is sleeved on the guide post 14 located on the right side of the slider 2. A first limit block 141 for limiting the first elastic member is provided at the first end of the guide post 14, and a second limit block 142 for limiting the second elastic member is provided at the second end of the guide post 14. The above-mentioned first elastic member and second elastic member are both linear springs, and they respectively provide elastic forces for balancing and resetting the slider 2. In this embodiment, the elastic force of the elastic member close to the water inlet 13 is very small, which is mainly used to provide a buffer balance force when the slider 2 moves towards the water inlet direction; the force of the elastic member far from the water outlet 13 is larger, which is mainly used to keep the slider 2 moving towards the water inlet 13, that is, to keep the injection hole 16 exposed.

[0027] At the edge where the main body 1 is connected to its side wall, a guiding inclined surface 15 that slopes downward and outward from top to bottom is formed. The upper end of the vertical part 22 of the U-shaped structure gradually extends inward from the main body 1 from bottom to top to form an inclined part 221 that cooperates with the guiding inclined surface 15. This structure can enhance the reliability of the cooperation between the main body 1 and the slider 2, and prevent the upper end of the slider 2 from loosening relative to the main body 1 and affecting the closing effect of the injection hole described below by the slider 2.

[0028] A plurality of injection holes 16 that can be covered or exposed as the slider 2 slides are provided on the side wall of the main body 1, and the plurality of injection holes 16 are arranged at intervals along the length direction on the side wall of the main body 1. The injection hole 16 is divided into a tapered section 161 and a straight-flow section 162 that are connected to each other along the water flow direction, and the inner diameter of the tapered section 161 gradually decreases along the water flow direction. When the rotation speed of the spray arm is too high, while the slider 2 moves towards the end of the main body 1 under the action of large centrifugal force and overcomes the elastic force of the elastic member 3, the jet area of the injection hole 16 is reduced by blocking. In this way, the rotation speed of the spray arm is reduced from two aspects: increasing the load as the slider 2 moves from the main body 1 to the end and reducing the power by reducing the jet area of the injection hole 16; when the rotation speed of the spray arm is too slow, the centrifugal force is not enough to move the slider 2 outward and keep the injection hole 16 exposed, and the rotation speed of the spray arm is increased from two aspects of reducing the load and increasing the power; the above two processes are constantly in dynamic balance, thereby realizing the adaptive adjustment of the rotation speed of the spray arm.

[0029] A convex block 222 that protrudes inward from the inner side of the vertical part 22 of the U-shaped structure and is relatively close to the side wall of the main body 1 and is arranged close to the outer periphery of the injection hole 16 is provided. This structure can make the sealing of the injection hole 16 by the side wall of the slider 2 more reliable and prevent local water leakage.

[0030] A first acceleration hole 171 communicating with the flow channel 11 and arranged near the first end of the main body 1 is formed in the first side wall of the main body 1, and a second acceleration hole 172 communicating with the flow channel 11 and arranged near the second end of the main body 1 is formed in the second side wall of the main body 1. The matching structures of the slider 2 with the elastic member 3 and the slider 2 with the injection hole 16 are two groups and are symmetrically arranged with respect to the water inlet 13. The above structure is beneficial to better control the rotational stability of the spray arm.

[0031] The cleaning machine of this embodiment includes a box body. A concave water return area is provided at the bottom of the box body. A filter plate is provided at the top of the water return area. The cleaning machine further includes the above-mentioned spray arm, which is rotatably arranged in the box body and located above the filter plate. A water pump for pumping the water in the water return area to the spray arm through the water inlet is provided in the water return area.

[0032] In the description and claims of the present invention, directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various exemplary structural parts and elements of the present invention. However, these terms are used here only for the convenience of description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these directional terms are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

Claims

1. A spray arm for a cleaning machine, comprising a body (1), the body (1) being hollow inside to form a flow channel (11) extending in the length direction, the top wall of the body (1) being provided with a plurality of water spray holes (12) connected to the flow channel (11), the central portion of the bottom wall of the body (1) being provided with a water inlet (13) connected to the flow channel (11), characterized in that: Slide blocks (2) are respectively arranged on the body (1) at both sides of the water inlet (13) and can slide towards the corresponding ends of the body (1) under the action of centrifugal force as the spray arm rotates. The body (1) is also provided with elastic members (3) that can keep the slide blocks (2) in a reset tendency.

2. The spray arm for a cleaning machine according to claim 1, characterized in that: The slider (2) is in a U-shaped structure, the transverse portion (21) of the U-shaped structure is arranged close to the bottom wall of the body (1), the two vertical portions (22) of the U-shaped structure are arranged close to the two side walls of the body (1), and the elastic member (3) is arranged at the bottom of the body (1) and is elastically connected to the transverse portion (21) of the U-shaped structure.

3. The spray arm for a cleaning machine according to claim 2, characterized in that: The bottom wall of the body (1) is provided with a guide column (14) extending in the length direction, and the transverse portion (21) of the U-shaped structure is provided with a limiting hole (211) which can be sleeved on the outer periphery of the guide column (14) and cooperate with the guide column (14).

4. The spray arm for a cleaning machine according to claim 3, characterized in that: A first elastic member is sleeved on the guide column (14) located on the left side of the slider (2), and a second elastic member is sleeved on the guide column (14) located on the right side of the slider (2). A first limit block (141) for limiting the first elastic member is provided at the first end of the guide column (14), and a second limit block (142) for limiting the second elastic member is provided at the second end of the guide column (14).

5. The spray arm for a cleaning machine according to claim 2, characterized in that: A guiding slope (15) which is inclined outward from top to bottom is formed at the edge where the main body (1) and its side wall are connected, and the upper end of the vertical portion (22) of the U-shaped structure gradually extends from bottom to top toward the inside of the main body (1) to form an inclined portion (221) that matches the guiding slope (15).

6. The spray arm for a cleaning machine according to any one of claims 2 to 5, characterized in that: The side wall of the body (1) is provided with a plurality of injection holes (16) which can be covered or exposed as the slider (2) slides, and the plurality of injection holes (16) are arranged at intervals along the length direction on the side wall of the body (1).

7. The spray arm for a cleaning machine according to claim 6, characterized in that: A protrusion (222) is protruded from the inner side of the vertical portion (22) of the U-shaped structure and is relatively close to the side wall of the body (1) and is thus arranged close to the outer periphery of the injection hole (16).

8. The spray arm for a cleaning machine according to any one of claims 1 to 5, characterized in that: A first acceleration hole (171) is provided on the first side wall of the body (1), which is connected to the flow channel (11) and arranged close to the first end of the body (1); and a second acceleration hole (172) is provided on the second side wall of the body (1), which is connected to the flow channel (11) and arranged close to the second end of the body (1).

9. The spray arm for a cleaning machine according to claim 8, characterized in that: The matching structures of the sliding block (2) and the elastic member (3) are in two groups and are arranged symmetrically relative to the water inlet (13).

10. A cleaning machine, comprising a box, wherein a concave water return area is provided at the bottom of the box, and a filter plate is provided at the top of the water return area, characterized in that: It also comprises a spray arm according to any one of claims 1 to 9, the spray arm being rotatably arranged in the box body and located above the filter plate, and a water pump for pumping water in the return water area into the spray arm through a water inlet (13) is arranged in the return water area.

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