A spray arm for a cleaning machine

Abstract

The present invention relates to a spray arm for a cleaning machine, comprising a body extending in a length direction, a water collecting chamber in the middle of the body, a first flow channel connected to the water collecting chamber on one side of the body, and a second flow channel connected to the water collecting chamber on the other side of the body. The profile corresponding to the water collecting chamber includes a first line segment and a second line segment that are centrally symmetrical. The first line segment includes a first arc segment and a second arc segment that are connected to each other and have different curvatures. The second line segment includes a third arc segment and a fourth arc segment that are connected to each other and have different curvatures. Along the direction of water flow, the first line segment and the second line segment form a spiral shell structure in the water collecting chamber. This structure is conducive to increasing the water pressure of the output water flow, thereby improving the water flow injection head. The first line segment and the second line segment both include three arc segments that are connected to each other and have different curvatures. This structure realizes the centrifugal effect of the volute with as few arc structures as possible, reduces energy loss, and is conducive to further improving the head of the sprayed water flow.

Description

Technical Field

[0001] The invention relates to the technical field of dishwasher accessories, in particular to a spray arm for a washing machine. Background Art

[0002] A dishwasher is a device that sprays cold or hot water onto dishes to remove dirt and clean them. Common dishwashers on the market include countertop, cabinet, and sink models. Only sink models use an open water pump, combining the pump with a spray arm. The spray arm, as part of the pump's volute, simultaneously draws water and sprays it, making it easy to disassemble for cleaning while maintaining a good water flow.

[0003] The applicant's prior application ZL201310752030.3 "Open Sink Cleaning Machine" discloses the above-mentioned water pump structure. The rotating spray arm serves as the water outlet component of the water pump, and an upper accommodating cavity is formed at the middle bottom thereof to accommodate the upper part of the blade. The rotating spray arm has a flow channel connected to the upper accommodating cavity. The upper accommodating cavity is located in the middle of the rotating spray arm, and the flow channel is located on both sides of the upper accommodating cavity.

[0004] In actual use, it was found that the above-mentioned spray arm had a large capacity loss when pumping water, which affected the head of the spray water column. When used in a sink-type dishwasher with a smaller washing space, the head of the above-mentioned spray arm could meet the cleaning requirements, but when the overall height of the washing chamber increased, the spray head of the above-mentioned spray arm could hardly meet the cleaning requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a spray arm for a cleaning machine which reduces capacity loss and improves the head of the spray water flow by optimizing the flow channel structure in response to the current status of the existing technology.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a spray arm for a cleaning machine, comprising a main body extending along the length direction, a water collecting chamber in the middle of the main body, a first flow channel connected to the water collecting chamber on one side of the main body, and a second flow channel connected to the water collecting chamber on the other side of the main body, a water inlet connected to the water collecting chamber is opened on the bottom wall of the main body, and a water spray hole is opened on the top wall and / or side wall of the main body, and the profile corresponding to the water collecting chamber includes a first line segment DA and a second line segment HE that are centrally symmetrical, the first line segment DA includes a first arc segment DC, a second arc segment CB, and a third arc segment BA that are connected in sequence and have different curvatures, and the second line segment HE includes a fourth arc segment HG, a fifth arc segment GF, and a sixth arc segment FE that are connected in sequence and have different curvatures.

[0007] In the above solution, the center of the water collecting chamber is taken as the origin O, the horizontal line passing through the origin O is taken as the X-axis, and the vertical line passing through the origin O is taken as the Y-axis. The first arc segment DC is:

[0008] (x-3.73) 2 +(y-3.73) 2 =26.53 2 (315°<μ≤360°),

[0009] Wherein, μ is the coordinate system angle corresponding to the first arc segment DC.

[0010] The second arc segment CB is:

[0011] (x+4.2) 2 +(y-4.2) 2 =34.53 2 (0°<α≤45°),

[0012] Wherein, α is the coordinate system angle corresponding to the second arc segment CB.

[0013] The third arc segment BA is:

[0014] (x+5.99) 2 +y 2 =38.47 2 (45°β≤90°),

[0015] Wherein, β is the coordinate system angle corresponding to the third arc segment BA.

[0016] The fourth arc segment HG is:

[0017] (x+3.73) 2 +(y+3.73) 2 =26.53 2 (135°<γ≤180°),

[0018] Wherein, γ is the coordinate system angle corresponding to the fourth arc segment HG.

[0019] The fifth arc segment GF is:

[0020] (x-4.2) 2 +(y+4.2) 2 =34.53 2 (180°<δ≤225°),

[0021] Wherein, δ is the coordinate system angle corresponding to the fifth arc segment GF.

[0022] The sixth arc segment FE is:

[0023] (x-5.99) 2 +y 2 =38.47 2 (225°<θ≤270°),

[0024] Wherein, θ is the coordinate system angle corresponding to the sixth arc segment FE.

[0025] The above structure is adopted to form a gradually opening volute structure. The water flows along the volute wall from the water collecting chamber to the left and right throats. The gradually opening wall causes the water pressure to gradually increase, which is beneficial to improving the head of the water ejected by the spray arm; the throat is a rectangular flow channel connecting the volute and the spray arm. The throat increases the water pressure again in the form of narrow to wide throat, thereby improving the water head.

[0026] In the present invention, the profile corresponding to the first flow channel comprises a first straight segment QR arranged horizontally above the X-axis and a second straight segment ZZ1 arranged horizontally below the X-axis. Counterclockwise, the starting end D of the first arc segment DC is connected to the first straight segment QR via a third straight segment NP. A fourth straight segment XY connects the end E of the sixth arc segment FE to the second straight segment KS. This structure helps reduce energy loss.

[0027] Preferably, the starting end D of the first arc segment DC is smoothly connected to the third straight segment NP via a first arc transition segment DN, and the third straight segment NP is smoothly connected to the first straight segment QR via a second arc transition segment PQ. The above structure is beneficial for further reducing capacity loss.

[0028] Preferably, a first straight connecting segment EW and a third arc transition segment WX are sequentially connected between the end E of the sixth arc segment FE and the fourth straight segment XY. The first straight connecting segment EW is arranged horizontally, and the third arc transition segment WX is tangentially connected to the first straight connecting segment EW and the fourth straight segment XY. The fourth straight segment XY and the second straight segment ZZ1 are connected via a fourth arc transition segment YZ that is tangentially connected to both. This structure further reduces power loss.

[0029] In the present invention, the profile corresponding to the second flow channel has a fifth straight line segment LM horizontally arranged above the X-axis and a sixth straight line segment UV horizontally arranged below the X-axis. In the counterclockwise direction, the starting end H of the fourth arc segment HG is connected to the sixth straight line segment UV through the seventh straight line segment ST, and the eighth straight line segment JK is connected between the end A of the third arc segment BA and the fifth straight line segment LM.

[0030] Preferably, a second straight connecting segment AI and a fifth arc transition segment IJ are sequentially connected between the end A of the third arc segment BA and the eighth straight segment JK. The second straight connecting segment AI is arranged horizontally. The fifth arc transition segment IJ is tangentially connected to the second straight connecting segment AI and the eighth straight segment JK, respectively. A sixth arc transition segment KL is connected tangentially to the eighth straight segment JK and the fifth straight segment LM, respectively. This structure further reduces power loss.

[0031] Preferably, the starting end H of the fourth arc segment HG is smoothly connected to the seventh straight segment ST via a seventh arc transition segment HS, and the seventh straight segment ST is smoothly connected to the sixth straight segment UV via an eighth arc transition segment TU. The above structure is conducive to further reducing power loss.

[0032] Preferably, the centers of the first flow channel and the second flow channel are located on the X-axis, and the widths of the first flow channel and the second flow channel on the Y-axis are 0.2 to 0.5 times the width of the water collecting chamber on the Y-axis.

[0033] Compared with the prior art, the advantages of the present invention are that: the profile corresponding to the water collecting chamber of the present invention includes a first line segment and a second line segment that are centrally symmetrical. Along the flow direction of the water, the first line segment and the second line segment form a gradually opening volute structure for the water collecting chamber, which is beneficial to increasing the water pressure of the output water flow, thereby improving the water flow injection head; the first line segment and the second line segment of the present invention both include three circular arc segments that are interconnected and have different curvatures. This structure realizes the centrifugal effect of the volute with as few circular arc structures as possible, reduces energy loss, and is beneficial to further improve the head of the injected water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of the spray arm in an embodiment of the present invention;

[0035] Figure 2 This is a structural schematic diagram of the spray arm at another angle in an embodiment of the present invention;

[0036] Figure 3 is a cross-sectional view of a spray arm according to an embodiment of the present invention;

[0037] Figure 4 Schematic diagram of the spray arm in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0039] like Figures 1 to 3As shown, the spray arm for the cleaning machine in this embodiment includes a main body 1 extending along the length direction, a water collecting chamber 10 in the middle of the main body 1, a first flow channel 11 connected to the water collecting chamber 10 on one side of the main body 1, and a second flow channel 12 connected to the water collecting chamber 10 on the other side of the main body 1. A water inlet 13 connected to the water collecting chamber 10 is opened on the bottom wall of the main body 1, and a water spray hole 14 connected to the first flow channel 11 and the second flow channel 12 is opened on the top wall of the main body 1.

[0040] In this embodiment, if Figure 4 As shown, the contour lines corresponding to the water collecting chamber 10 include a first line segment DA and a second line segment HE which are centrally symmetrical. The first line segment DA includes a first arc segment DC, a second arc segment CB, and a third arc segment BA which are connected in sequence and have different curvatures. The second line segment HE includes a fourth arc segment HG, a fifth arc segment GF, and a sixth arc segment FE which are connected in sequence and have different curvatures.

[0041] Specifically, with the center of the water collecting chamber 10 as the origin O, the horizontal line passing through the origin O as the X-axis, and the vertical line passing through the origin O as the Y-axis, the first arc segment DC is:

[0042] (x-3.73) 2 +(y-3.73) 2 =26.53 2 (315°<μ≤360°),

[0043] Wherein, μ is the coordinate system angle corresponding to the first arc segment DC.

[0044] The second arc segment CB is:

[0045] (x+4.2) 2 +(y-4.2) 2 =34.53 2 (0°<α≤45°),

[0046] Wherein, α is the coordinate system angle corresponding to the second arc segment CB.

[0047] The third arc segment BA is:

[0048] (x+5.99) 2 +y 2 =38.47 2 (45°<β≤90°),

[0049] Wherein, β is the coordinate system angle corresponding to the third arc segment BA.

[0050] The fourth arc segment HG is:

[0051] (x+3.73) 2 +(y+3.73)2 =26.53 2 (135°<γ≤180°),

[0052] Wherein, γ is the coordinate system angle corresponding to the fourth arc segment HG.

[0053] The fifth arc segment GF is:

[0054] (x-4.2) 2 +(y+4.2) 2 =34.53 2 (180°<δ≤225°),

[0055] Wherein, δ is the coordinate system angle corresponding to the fifth arc segment GF.

[0056] The sixth arc segment FE is:

[0057] (x-5.99) 2 +y 2 =38.47 2 (225°<θ≤270°),

[0058] Wherein, θ is the coordinate system angle corresponding to the sixth arc segment FE.

[0059] In this embodiment, the arc radius of the first and fourth arc segments DC and HG is 29mm, the arc radius of the second and fifth arc segments CB and GF is 30mm, and the arc radius of the third and sixth arc segments BA and FE is 34mm. This structure forms a volute with an involute opening. Water flows along the volute wall from the water collection chamber to the left and right throats. The involute opening wall gradually increases water pressure, which helps to increase the head of the water ejected by the spray arm. The throat is a rectangular flow channel connecting the volute and the spray arm. The throat's gradual widening further increases water pressure, thereby increasing the head of the water flow.

[0060] In this embodiment, the profile corresponding to the first flow channel 11 has a first straight line segment QR horizontally arranged above the X-axis and a second straight line segment ZZ1 horizontally arranged below the X-axis. In the counterclockwise direction, the starting end D of the first arc segment DC is connected to the first straight line segment QR through the third straight line segment NP, and the fourth straight line segment XY is connected between the end E of the sixth arc segment FE and the second straight line segment KS.

[0061] The starting end D of the first arc segment DC is smoothly connected to the third straight segment NP via a first arc transition segment DN, with a radius of 1.5 mm. The third straight segment NP is smoothly connected to the first straight segment QR via a second arc transition segment PQ, with a radius of 60 mm. The end E of the sixth arc segment FE is connected to the fourth straight segment XY via a first straight connecting segment EW and a third arc transition segment WX, respectively. The first straight connecting segment EW is arranged horizontally, and the third arc transition segment WX is tangentially connected to the first straight connecting segment EW and the fourth straight segment XY, respectively. The radius of the third arc transition segment WX is 30 mm. The fourth straight segment XY is connected to the second straight segment ZZ1 via a fourth arc transition segment YZ, which is tangentially connected to both segments. The radius of the fourth arc transition segment YZ is 40 mm. This structure helps reduce capacity loss.

[0062] In this embodiment, the profile corresponding to the second flow channel 12 has a fifth straight line segment LM horizontally arranged above the X-axis and a sixth straight line segment UV horizontally arranged below the X-axis. In the counterclockwise direction, the starting end H of the fourth arc segment HG is connected to the sixth straight line segment UV through the seventh straight line segment ST, and the eighth straight line segment JK is connected between the end A of the third arc segment BA and the fifth straight line segment LM.

[0063] The second straight connecting segment AI and the fifth arc transition segment IJ are connected in sequence between the end A of the third arc segment BA and the eighth straight segment JK. The radius of the fifth arc transition segment IJ is 30mm. The second straight connecting segment AI is arranged horizontally. The fifth arc transition segment IJ is tangentially connected to the second straight connecting segment AI and the eighth straight segment JK, respectively. The sixth arc transition segment KL is connected tangentially to the eighth straight segment JK and the fifth straight segment LM. The radius of the sixth arc transition segment KL is 40mm. The starting end H of the fourth arc segment HG is smoothly connected to the seventh straight segment ST by the seventh arc transition segment HS. The radius of the seventh arc transition segment HS is 1.5mm. The seventh straight segment ST is smoothly connected to the sixth straight segment UV by the eighth arc transition segment TU. The radius of the eighth arc transition segment TU is 60mm. The above structure helps to reduce power loss.

[0064] In this embodiment, the centers of the first flow channel 11 and the second flow channel 12 are located on the X axis, and the widths of the first flow channel 11 and the second flow channel 12 on the Y axis are 0.2 to 0.5 times the width of the water collecting chamber 10 on the Y axis.

[0065] The profile corresponding to the water collecting chamber 10 of this embodiment includes a first line segment DA and a second line segment HE that are centrally symmetrical. Along the flow direction of the water, the first line segment DA and the second line segment HE form a gradually opening volute structure for the water collecting chamber 10. This structure is beneficial to increasing the water pressure of the output water flow, thereby improving the water jet head; the first line segment DA and the second line segment HE both include three circular arc segments that are interconnected and have different curvatures. This structure realizes the centrifugal effect of the volute with as few circular arc structures as possible, reduces energy loss, and is beneficial to further improving the head of the jet water flow.

[0066] In the present specification and claims, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Because the embodiments disclosed herein can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A spray arm for a cleaning machine, comprising a body (1) extending in a longitudinal direction, a water collecting chamber (10) in the middle of the body (1), a first flow channel (11) connected to the water collecting chamber (10) on one side of the body (1), a second flow channel (12) connected to the water collecting chamber (10) on the other side of the body (1), a water inlet (13) connected to the water collecting chamber (10) on the bottom wall of the body (1), and a water spray hole (14) on the top wall and / or side wall of the body (1), characterized in that: The contour line corresponding to the water collecting chamber (10) comprises a first line segment DA and a second line segment HE which are centrally symmetrical, wherein the first line segment DA comprises a first arc segment DC, a second arc segment CB, and a third arc segment BA which are connected in sequence and have different curvatures, and the second line segment HE comprises a fourth arc segment HG, a fifth arc segment GF, and a sixth arc segment FE which are connected in sequence and have different curvatures; The first line segment DA and the second line segment HE, which are centrally symmetrical, both include three circular arc segments that are connected to each other and have different curvatures, so that the water collecting chamber (10) forms a gradually opening volute structure that can increase the water pressure of the output water flow. The centrifugal action provided by the different circular arc segments of the gradually opening volute structure reduces energy loss.

2. The spray arm for a cleaning machine according to claim 1, characterized in that: The center of the water collecting chamber (10) is taken as the origin O, the horizontal line passing through the origin O is taken as the X axis, the vertical line passing through the origin O is taken as the Y axis, and the first arc segment DC is (x-3.73) 2 +(y-3.73) 2 =26.53 2 (315°<μ≤360°), Wherein, μ is the coordinate system angle corresponding to the first arc segment DC.

3. The spray arm for a cleaning machine according to claim 2, characterized in that: The second arc segment CB is (x+4.2) 2 +(y-4.2) 2 =34.53 2 (0°<α≤45°), Wherein, α is the coordinate system angle corresponding to the second arc segment CB.

4. The spray arm for a cleaning machine according to claim 2, characterized in that: The third arc segment BA is (x+5.99) 2 +y 2 =38.47 2 (45°<β≤90°), Wherein, β is the coordinate system angle corresponding to the third arc segment BA.

5. The spray arm for a cleaning machine according to claim 2, characterized in that: The fourth arc segment HG is (x+3.73) 2 +(y+3.73) 2 =26.53 2 (135°<γ≤180°), Wherein, γ is the coordinate system angle corresponding to the fourth arc segment HG.

6. The spray arm for a cleaning machine according to claim 2, characterized in that: The fifth arc segment GF is (x-4.2) 2 +(y+4.2) 2 =34.53 2 (180°<δ≤225°), Wherein, δ is the coordinate system angle corresponding to the fifth arc segment GF.

7. The spray arm for a cleaning machine according to claim 2, characterized in that: The sixth arc segment FE is (x-5.99) 2 +y 2 =38.47 2 (225°<θ≤270°), Wherein, θ is the coordinate system angle corresponding to the sixth arc segment FE.

8. The spray arm for a cleaning machine according to any one of claims 2 to 7, characterized in that: The profile corresponding to the first flow channel (11) has a first straight line segment QR arranged horizontally above the X-axis and a second straight line segment ZZ1 arranged horizontally below the X-axis. In the counterclockwise direction, the starting end D of the first arc segment DC is connected to the first straight line segment QR through the third straight line segment NP, and the fourth straight line segment XY is connected between the end E of the sixth arc segment FE and the second straight line segment KS.

9. The spray arm for a cleaning machine according to claim 8, characterized in that: The starting end D of the first arc segment DC is smoothly connected to the third straight segment NP via a first arc transition segment DN, and the third straight segment NP is smoothly connected to the first straight segment QR via a second arc transition segment PQ.

10. The spray arm for a cleaning machine according to claim 8, characterized in that: The end E of the sixth arc segment FE and the fourth straight line segment XY are connected in sequence with the first straight line connecting segment EW and the third arc transition segment WX. The first straight line connecting segment EW is arranged horizontally. The third arc transition segment WX is tangentially connected to the first straight line connecting segment EW and the fourth straight line segment XY respectively. The fourth straight line segment XY and the second straight line segment ZZ1 are connected with the fourth arc transition segment YZ that is tangentially connected to the two respectively.

11. The spray arm for a cleaning machine according to any one of claims 2 to 7, characterized in that: The profile corresponding to the second flow channel (12) has a fifth straight line segment LM horizontally arranged above the X-axis and a sixth straight line segment UV horizontally arranged below the X-axis. In the counterclockwise direction, the starting end H of the fourth arc segment HG is connected to the sixth straight line segment UV through the seventh straight line segment ST, and the end A of the third arc segment BA is connected to the fifth straight line segment LM by an eighth straight line segment JK.

12. The spray arm for a cleaning machine according to claim 11, characterized in that: The second straight line connecting segment AI and the fifth arc transition segment IJ are connected in sequence between the end A of the third arc segment BA and the eighth straight line segment JK. The second straight line connecting segment AI is arranged horizontally. The fifth arc transition segment IJ is tangentially connected to the second straight line connecting segment AI and the eighth straight line segment JK respectively. The sixth arc transition segment KL is connected tangentially to the eighth straight line segment JK and the fifth straight line segment LM.

13. The spray arm for a cleaning machine according to claim 11, characterized in that: The starting end H of the fourth arc segment HG and the seventh straight segment ST are smoothly connected via a seventh arc transition segment HS, and the seventh straight segment ST and the sixth straight segment UV are smoothly connected via an eighth arc transition segment TU.

14. The spray arm for a cleaning machine according to any one of claims 2 to 7, characterized in that: The centers of the first flow channel (11) and the second flow channel (12) are located on the X axis, and the widths of the first flow channel (11) and the second flow channel (12) on the Y axis are 0.2 to 0.5 times the width of the water collecting chamber (10) on the Y axis.

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