Spray arm for a dishwasher and dishwasher

Abstract

The utility model relates to a kind of spray arm and cleaning machine for cleaning machine, including the body extending along length direction, the body is formed with internal hollow flow passage, the body is equipped with with flow passage intercommunication water inlet, spray hole, the cross-sectional area of the flow passage is S1, the sum of the cross-sectional area of each spray hole is S2, S1≥3S2.The utility model will flow passage cross-sectional area with spray hole cross-sectional area sum constraint as S1≥3S2 relationship, this structure balances flow passage and spray hole area from water pressure aspect, to effectively improve cleaning coverage on the basis of maintaining high lift, to improve cleaning effect further.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, specifically to a spray arm and a washing machine for cleaning tableware, fruits and vegetables. Background Technology

[0002] Dishwashers typically include a spray arm that rinses dishes or fruits and vegetables by spraying water jets. For example, Chinese patents CN204813755U ("Dishwasher Spray Arm Base, Dishwasher Spray Arm Device and Dishwasher") and CN209932651U ("A Spray Arm for a Cleaning Machine") disclose the corresponding spray arm structures.

[0003] To improve the cleaning coverage of the main spray arm, current dishwashers often increase the number of spray nozzles in the main spray arm. However, the spray arm's ability to achieve a good spraying effect is directly related to both the flow channel structure and the number of spray nozzles. Without changing the flow channel structure, simply increasing the number of spray nozzles to increase the spray coverage will inevitably lead to a decrease in the overall water flow head, a poorer water flow impact effect, and consequently, a poorer cleaning effect. Utility Model Content

[0004] The first technical problem to be solved by this utility model is to provide a spray arm for a cleaning machine that combines high lift and high cleaning coverage with good cleaning effect, in light of the current state of the technology.

[0005] The second technical problem to be solved by this utility model is to provide a cleaning machine with the above-mentioned spray arm, in view of the current situation of the prior art.

[0006] The technical solution adopted by this utility model to solve at least one of the above-mentioned technical problems is as follows:

[0007] A spray arm for a cleaning machine includes a body extending along its length, the body forming an internally hollow flow channel, the body having a water inlet and spray holes communicating with the flow channel, the cross-sectional area of ​​the flow channel being S1, the sum of the cross-sectional areas of the spray holes being S2, and 5S2≥S1≥3S2.

[0008] This invention constrains the cross-sectional area of ​​the flow channel and the cross-sectional area of ​​the nozzle to a relationship of S1≥3S2. This structure balances the flow channel and nozzle areas in terms of water pressure, thereby effectively improving the cleaning coverage while maintaining a high head, and thus improving the cleaning effect.

[0009] Preferably, the flow channel located to the left of the inlet is divided into at least two branch flow channels extending in the same direction, each branch flow channel being connected to at least one first nozzle. Dividing the flow channel into at least two branch flow channels extending in the same direction reduces the number of first nozzles supplied by independent flow channels, thereby reducing pressure loss, making the jet flow rate of each nozzle more stable, achieving a greater head with a constant inlet water volume, and improving the spray coverage of the nozzle jet, thus improving the cleaning effect.

[0010] Preferably, the first spray nozzle is positioned near the left end of the body. The closer the first spray nozzle is to the end, the greater the spray coverage it can provide.

[0011] Preferably, the flow channel located to the right of the inlet forms an annular flow channel extending along the length of the body. The body has an outlet located near the right end of the annular flow channel, and an auxiliary spray arm is rotatably connected to the outlet. The auxiliary spray arm has a second spray hole. Simulation results show that, under a constant flow rate, a first spray hole can provide 2-3% spray coverage, while a second spray hole can provide at least 8-10% spray coverage. Therefore, this invention reduces the number of first spray holes and adds a second spray hole to effectively improve the cleaning coverage while maintaining a high head.

[0012] As an improvement, the distance from the inlet to the left end of the branch channel is 2L1, and the distance from the inlet to the outlet is 2L2. 左 ×L1=(F 右 +2F 辅助喷臂 )×L2, where F 左 For the gravity of the water filling the flow channel on the left side of the inlet, F 右 F is the weight of the water filling the flow channel on the right side of the inlet. 辅助喷臂 To assist in the weight-bearing effect of water filling the spray arm channel, preferably, L1 / L2 = 1.3~2. The weight of the spray arms on both sides of the inlet is matched, providing more reliable rotational stability. This invention, using the above design parameters, effectively balances the overall force on the spray arm for spray arms with different channel structures and spray structures on both sides of the inlet, thereby improving the rotational stability of the spray arm.

[0013] Preferably, the auxiliary spray arm has a main body extending along its length, and the second spray holes are multiple and arranged at least partially near the end of the auxiliary spray arm. The farther the spray holes are from the rotation center, the wider their cleaning coverage. By concentrating the second spray holes closer to the end of the auxiliary spray arm, the spray coverage area can be expanded, and the cleaning effect can be improved.

[0014] Preferably, the auxiliary spray arm forms an S-shaped flow channel extending along its length. The water inlet of the auxiliary spray arm is located at the bottom of the auxiliary spray arm and is arranged corresponding to the central portion of the S-shaped flow channel. Some of the second nozzles are arranged near the first end of the S-shaped flow channel, and some of the second nozzles are arranged near the second end of the S-shaped structure. This structure allows for a longer flow channel path, enabling more second nozzles to be arranged within a limited space, thus improving cleaning coverage.

[0015] Preferably, the number of first spray holes can be set to 2-8 as needed, preferably 4-6, and even more preferably 4. The number of first spray holes 11 can be set to 2, 3, 4, 5, 6, 7, or 8. The number of second spray holes can be the same as the number of first spray holes, preferably more than the number of first spray holes, for example, 2-16 as needed, preferably 4-14, even more preferably 6-12, and even more preferably 8, with 4 near the first end of the S-shaped flow channel and 4 near the second end of the S-shaped flow channel. Under a certain flow rate, simulation results show that one first spray hole can provide a spray coverage rate of 2-3%, while one second spray hole can provide a spray coverage rate of at least 8-10%. Therefore, this utility model reduces the number of first spray holes and increases the number of second spray holes to effectively improve the cleaning coverage rate while maintaining a high head.

[0016] Preferably, the ratio of the number of first spray holes to the number of second spray holes is 4:(5-10), more preferably 4:8. Since the first spray hole is a fixed hole relative to the spray arm body, while the second spray hole is a rotating hole relative to the spray arm body, the rotating hole has a larger spray coverage. This invention reduces the number of first spray holes and increases the number of second spray holes, which is beneficial to improve the overall spray coverage while maintaining the water flow output and head unchanged. However, if the number of second spray holes is too large, it is easy to affect the hydraulic balance on both sides of the spray arm, leading to problems such as unstable rotation of the spray arm.

[0017] Preferably, the end of the flow channel located on the left side of the inlet is connected to the first nozzle, and the end of the flow channel located on the right side of the inlet is connected to an auxiliary spray arm with a second nozzle. The ratio of the water flow rate of the flow channel on the left side to that on the right side of the inlet is 4:(5-8), more preferably 4:6. Since the first nozzle is a fixed hole relative to the spray arm body, while the second nozzle is a rotating hole relative to the spray arm body, the flow path of the water is more complex and longer during the jet output process after connecting the auxiliary spray arm. The above structure distributes the flow rate on both sides as needed, overcomes the stroke loss of the flow channel on the auxiliary spray arm side, and balances the head requirement of the right flow channel.

[0018] Preferably, the cross-sectional area of ​​the flow channel located to the left of the inlet is S. 左流道截面积 The cross-sectional area of ​​the flow channel located to the right of the inlet is S. 右流道截面积 180mm2 >S 左流道截面积 >108mm 2 300mm 2 >S 右流道截面积 >180mm 2 According to the hydraulic calculation formula P = ρQHg, and considering the design structure of the spray arm in this invention, the output water power of the spray arm is related to the loss coefficient. That is, given a fixed flow distribution, the smaller the loss coefficient, the greater the total output water power, and vice versa. This invention limits the cross-sectional area of ​​the left and right channels as described above, which helps to reduce losses and increase the output water power and head of the spray arm. Preferably, the channel has an X-shaped structure, with two extended arms forming two branch channels, and the other two extended arms of the X-shaped structure connecting at their ends to form an integral channel. This structure facilitates the further installation of other auxiliary spray structures based on the channel structure. For example, an outlet can be provided at the end of the integral channel, and an auxiliary spray arm can be installed through this outlet, with a second spray hole on the auxiliary spray arm to expand the overall spray coverage of the spray arm and improve the cleaning effect.

[0019] A cleaning machine includes a housing and the aforementioned spray arm, which is rotatably disposed within the housing.

[0020] Compared with the prior art, the advantages of this utility model are as follows: This utility model constrains the sum of the cross-sectional area of ​​the flow channel and the cross-sectional area of ​​the nozzle to the relationship of 5S2≥S1≥3S2. This structure balances the flow channel and nozzle area from the perspective of water pressure, thereby effectively improving the cleaning coverage while maintaining high head, and thus improving the cleaning effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 Exploded view;

[0023] Figure 3 for Figure 1 A sectional view;

[0024] Figure 4 This is a schematic diagram of the flow channel structure of the main body in an embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the flow channel structure of the auxiliary spray arm in an embodiment of the present invention;

[0026] Figure 6 This is a top view of an embodiment of the present utility model. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms 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, they should not be construed as limitations on this utility model.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0033] like Figures 1-6 As shown, the spray arm for the cleaning machine in this embodiment includes a body 1 extending along the length direction. The body 1 forms an internally hollow flow channel 12. The body 1 has a water inlet 13 and spray holes that are connected to the flow channel 12. The cross-sectional area of ​​the flow channel 12 is S1, and the sum of the cross-sectional areas of each spray hole is S2, where 5S2≥S1≥3S2.

[0034] In this embodiment, the cross-sectional area of ​​the flow channel 12 is constrained to the sum of the cross-sectional areas of the nozzles as S1≥3S2. This structure balances the flow channel 12 and the nozzle area in terms of water pressure, thereby effectively improving the cleaning coverage while maintaining a high head, and thus improving the cleaning effect.

[0035] In this embodiment, the flow channel 12 located to the left of the inlet 13 is divided into at least two branch flow channels 121 extending in the same direction, and each branch flow channel 121 is connected to at least one first nozzle 11. Dividing the flow channel 12 into at least two branch flow channels 121 that can extend in the same direction reduces the number of first nozzles 11 supplied by the independent flow channel 12, thereby reducing pressure loss, making the jet flow rate of each nozzle more stable, obtaining a greater head with a constant inlet water volume, and improving the spray coverage of the nozzle jet, thereby improving the cleaning effect.

[0036] The first nozzle 11 is arranged near the left end of the main body 1. The closer the first nozzle 11 is to the end, the greater the spray coverage it can provide.

[0037] The flow channel 12 located to the right of the inlet 13 forms an annular flow channel 122 extending along the length of the body 1. The body 1 has an outlet 14 located near the right end of the annular flow channel 122. An auxiliary spray arm 2 is rotatably connected to the outlet 14, and a second spray hole 21 is provided on the auxiliary spray arm 2. Under a constant flow rate, simulation results show that a first spray hole 11 can provide a spray coverage rate of 2-3%, while a second spray hole 21 can provide a spray coverage rate of at least 8-10%. Therefore, in this embodiment, the number of first spray holes 11 is reduced and a second spray hole 21 is added to effectively improve the cleaning coverage rate while maintaining a high head.

[0038] As an improvement, the distance from the inlet 13 to the left end of the branch channel 121 is 2L1, and the distance from the inlet 13 to the outlet 14 is 2L2. 左 ×L1=(F 右 +2F 辅助喷臂 )×L2, where F 左 For the gravity of the water filling the left channel of inlet 13, F 右 For the gravity of the water filling the flow channel on the right side of inlet 13, F 辅助喷臂 To assist the weight of the water-filled flow channel in the spray arm 2, L1 / L2 = 1.3~2. The weight of the spray arms on both sides of the inlet 13 is matched, which can provide more reliable rotational stability for the spray arms. This embodiment adopts the above design parameters, which can well balance the overall force of the spray arm for spray arms with different flow channel 12 structures and different spray structures on both sides of the inlet 13, so as to improve the rotational stability of the spray arm.

[0039] The aforementioned auxiliary spray arm 2 has a main body extending along its length, and multiple second spray holes 21 are arranged, at least partially, near the end of the auxiliary spray arm 2. The farther the spray hole is from the rotation center, the wider its cleaning coverage area. By concentrating the second spray holes 21 closer to the end of the auxiliary spray arm 2, the spray coverage area can be expanded, and the cleaning effect can be improved.

[0040] An S-shaped flow channel 23 extending along the length direction is formed in the auxiliary spray arm 2. The water inlet of the auxiliary spray arm 2 is located at the bottom of the auxiliary spray arm 2 and is arranged corresponding to the central part of the S-shaped flow channel 23. Some of the second nozzles 21 are arranged near the first end of the S-shaped flow channel 23, and some of the second nozzles 21 are arranged near the second end of the S-shaped structure. The above structure allows the flow channel 12 to have a longer path, enabling more second nozzles 21 to be arranged in a limited space, thereby improving the cleaning coverage.

[0041] In this embodiment, the number of first nozzles 11 can be set to 2-8 as needed, preferably 4-6, and even more preferably 4. The number of first nozzles 1111 can be 2, 3, 4, 5, 6, 7, or 8. The number of second nozzles 21 can be the same as the number of first nozzles 11, preferably more than the number of first nozzles 11, for example, 2-16 as needed, preferably 4-14, even more preferably 6-12, and even more preferably 8, with 4 near the first end of the S-shaped flow channel 23 and 4 near the second end of the S-shaped flow channel 23. Under a certain flow rate, simulation results show that one first nozzle 11 can provide a spray coverage rate of 2-3%, while one second nozzle 21 can provide a spray coverage rate of at least 8-10%. Therefore, this embodiment reduces the number of first nozzles 11 and increases the number of second nozzles 21 to effectively improve the cleaning coverage rate while maintaining a high head.

[0042] In this embodiment, the ratio of the number of first nozzles 11 to the number of second nozzles 21 is 4:(5-10), more preferably 4:8. Since the first nozzles 11 are fixed holes relative to the spray arm body, while the second nozzles 21 are rotating holes relative to the spray arm body, the rotating holes have a larger spray coverage. In this embodiment, reducing the number of first nozzles 11 and increasing the number of second nozzles 21 is beneficial to improving the overall spray coverage while maintaining the water flow output and head unchanged.

[0043] The end of the flow channel located on the left side of the inlet 13 is connected to the first nozzle 11, and the end of the flow channel located on the right side of the inlet 13 is connected to an auxiliary spray arm 2 with a second nozzle 21. The ratio of the water flow rate of the flow channel on the left side to that on the right side of the inlet 13 is 4:(5-8), more preferably 4:6. Since the first nozzle 11 is a fixed hole relative to the spray arm body, while the second nozzle 21 is a rotating hole relative to the spray arm body, the flow path of the water flow is more complex and longer during the jet output process after connecting the auxiliary spray arm 2. The above structure distributes the flow rate on both sides as needed, overcomes the stroke loss of the flow channel on the auxiliary spray arm 2 side, and balances the head requirement of the flow channel on the right side.

[0044] The cross-sectional area of ​​the flow channel located to the left of inlet 13 is S. 左流道截面积 The cross-sectional area of ​​the flow channel located to the right of inlet 13 is S. 右流道截面积 180mm 2 >S 左流道截面积 >108mm 2 300mm 2 >S 右流道截面积 >180mm 2According to the hydraulic calculation formula P = ρQHg, and considering the design structure of the spray arm in this embodiment, the output water power of the spray arm is related to the loss coefficient. That is, given a fixed flow distribution, the smaller the loss coefficient, the greater the total output water power, and vice versa. This embodiment limits the cross-sectional area of ​​the left and right flow channels as described above, which helps to reduce losses and increase the output water power and head of the spray arm.

[0045] In this embodiment, the flow channel 12 has an X-shaped structure. The two extended arms of the X-shaped structure form two branch flow channels 121, and the other two extended arms of the X-shaped structure are connected at their ends to form an integral flow channel. Using this structure, it is convenient to further configure other auxiliary spray structures according to the flow channel 12 structure. For example, an outlet 14 can be provided at the end of the integral flow channel, and an auxiliary spray arm 2 can be provided through this outlet 14. A second spray hole 21 is provided on the auxiliary spray arm 2 to expand the overall spray coverage of the spray arm and improve the cleaning effect.

[0046] A cleaning machine includes a housing and the aforementioned spray arm, which is rotatably disposed within the housing.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A spray arm for a cleaning machine, comprising a body (1) extending along its length, the body (1) having an internally hollow flow channel (12), the body (1) having a water inlet (13) and spray holes communicating with the flow channel (12), characterized in that: The cross-sectional area of ​​the flow channel (12) is S1, and the sum of the cross-sectional areas of each of the nozzles is S2, where 5S2≥S1≥3S2.

2. The spray arm for a cleaning machine according to claim 1, characterized in that: The flow channel (12) located to the left of the inlet (13) is divided into at least two branch flow channels (121) extending in the same direction, and each branch flow channel (121) is connected to at least one first nozzle (11).

3. The spray arm for a cleaning machine according to claim 2, characterized in that: The first nozzle (11) is located near the left end of the body (1).

4. The spray arm for a cleaning machine according to claim 2, characterized in that: The flow channel (12) located to the right of the inlet (13) forms an annular flow channel (122) extending along the length of the body (1). The body (1) has an outlet (14) arranged near the right end of the annular flow channel (122). An auxiliary spray arm (2) is rotatably connected to the outlet (14). A second spray hole (21) is provided on the auxiliary spray arm (2).

5. The spray arm for a cleaning machine according to claim 4, characterized in that: The distance from the inlet (13) to the left end of the branch channel (121) is 2L1, and the distance from the inlet (13) to the outlet (14) is 2L2. 左 ×L1=(F 右 +2F 辅助喷臂 )×L2, where F 左 For the gravity of the water filling the flow channel on the left side of the inlet (13), F 右 For the gravity of the water filling the flow channel on the right side of the inlet (13), F 辅助喷臂 To assist the gravity of the water filling the flow channel of the spray arm (2).

6. The spray arm for a cleaning machine according to claim 5, characterized in that: L1 / L2 = 1.3 to 2.

7. The spray arm for a cleaning machine according to claim 4, characterized in that: The auxiliary spray arm (2) has a main body extending along its length, and the second spray holes (21) are multiple and at least partially arranged near the ends of the auxiliary spray arm (2).

8. The spray arm for a cleaning machine according to claim 4, characterized in that: An S-shaped flow channel (23) extending along the length direction is formed in the auxiliary spray arm (2). The water inlet of the auxiliary spray arm (2) is opened at the bottom of the auxiliary spray arm (2) and is arranged in the central part of the S-shaped flow channel (23). Some of the second nozzles (21) are arranged near the first end of the S-shaped flow channel (23) and some of the second nozzles (21) are arranged near the second end of the S-shaped structure.

9. The spray arm for a cleaning machine according to claim 4, characterized in that: The number of the first nozzles (11) is 2, 3, 4, 5, 6, 7 or 8, and the number of the second nozzles (21) is greater than or equal to the number of the first nozzles (11), and the number of the second nozzles (21) is 6-12.

10. The spray arm for a cleaning machine according to claim 4, characterized in that: The ratio of the number of the first nozzle (11) to the number of the second nozzle is 4:(5-10).

11. The spray arm for a cleaning machine according to any one of claims 1 to 10, characterized in that: The end of the flow channel located on the left side of the inlet (13) is connected to the first nozzle, and the end of the flow channel located on the right side of the inlet (13) is connected to an auxiliary spray arm with a second nozzle. The ratio of the water flow rate of the flow channel on the left side of the inlet (13) to that of the flow channel on the right side is 4:(5-8).

12. The spray arm for a cleaning machine according to claim 11, characterized in that: The cross-sectional area of ​​the flow channel located to the left of the inlet is S. 左流道截面积 The cross-sectional area of ​​the flow channel located to the right of the inlet is S. 右流道截面积 180mm 2 >S 左流道截面积 >108mm 2 300mm 2 >S 右流道截面积 >180mm 2 .

13. The spray arm for a cleaning machine according to any one of claims 2 to 10, characterized in that: The flow channel (12) has an X-shaped structure. The two extended arms of the X-shaped structure form two branch flow channels (121). The other two extended arms of the X-shaped structure are connected at the ends to form an integral flow channel.

14. A cleaning machine, comprising a housing, characterized in that: It also includes a spray arm as described in any one of claims 1 to 13, the spray arm being rotatably disposed in the housing.

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