Spraying arm for cleaning machine and cleaning machine

Abstract

The spraying arm comprises a body extending in the length direction, a water inlet and first spraying holes are formed in the body, a hollow flow channel is formed in the body, and the water inlet is formed in the middle of the body and divides the flow channel into a first part and a second part which are arranged left and right; the first spraying hole is arranged close to the first end of the body and is communicated with the first part, the body is provided with a water outlet which is arranged close to the second end of the body and is communicated with the second part, the water outlet is rotatably connected with an auxiliary spraying arm, and the auxiliary spraying arm is provided with a second spraying hole; the first part outputs water flow through the first spraying hole, the second part outputs water flow through the water outlet, the auxiliary spraying arm and the second spraying hole, and the first part is provided with a shrinkage structure which is arranged close to the water inlet and used for balancing the vertical stroke loss of fluid of the second part.

Description

Technical Field

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

[0002] Dishwashers are typically equipped with a spray arm that sprays water to rinse dishes or fruits and vegetables. For example, Chinese patents with authorization publication number CN204813755U, "Dishwasher spray arm holder, dishwasher spray arm device, and dishwasher" (application number: CN201520531714.5), and CN209932651U, "A spray arm for a washing machine" (application number: CN201920258610.X), both disclose corresponding spray arm structures.

[0003] Existing dishwashers often increase the number of nozzles in the main spray arm to improve cleaning coverage. However, a greater number of nozzles reduces the overall water head, resulting in poorer water flow impact and, consequently, poorer cleaning performance. Furthermore, the nozzle distribution structure can lead to uneven flow distribution on both sides of the spray arm, further impacting spray head and cleaning performance. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a spray arm for a cleaning machine that can balance the flow rates on both sides and thereby improve the cleaning coverage while maintaining a high head, thereby improving the cleaning effect, in response to the current status of the existing technology.

[0005] The second technical problem to be solved by the present invention is to provide a cleaning machine using the above-mentioned spray arm in response to the current status of the existing technology.

[0006] The technical solution adopted by the present invention to solve at least one of the above technical problems is: A spray arm for a cleaning machine comprises a main body extending in a length direction, the main body being provided with a water inlet and a first spray hole, the main body being formed with an internal hollow flow channel, the water inlet being provided in the middle of the main body and dividing the flow channel into a first part and a second part arranged on the left and right, the first spray hole being provided near the first end of the main body and being communicated with the first part, the main body being provided with a water outlet being provided near the second end thereof and being communicated with the second part, the water outlet being rotatably connected to an auxiliary spray arm, the auxiliary spray arm being provided with a second spray hole; the first part outputs water through the first spray hole, the second part outputs water through the water outlet, the auxiliary spray arm and the second spray hole, the first part being provided with a contraction structure arranged near the water inlet for balancing the vertical stroke loss of the fluid in the second part.

[0007] With the above structure, the water in the first part of the flow channel is output directionally through the first spray holes, and the water in the second part of the flow channel is output rotationally through the water outlet and the auxiliary spray arm. Through the cooperation of the two parts, it is beneficial to improve the spraying coverage rate on the basis of setting fewer spray holes and maintaining a high lift. At the same time, considering the extension and loss of the water flow in the vertical direction in the auxiliary spray arm, a contraction structure is set at the first part of the flow channel to reduce the flow rate of the first part and distribute more flow rate to the second part, so as to balance the flow rates on both sides and ensure that the auxiliary spray arm can also maintain the required spraying lift.

[0008] Preferably, the flow channel has an X-shaped structure, the central intersection of the X-shaped structure is arranged corresponding to the water inlet, the upper part of the X-shaped structure forms the first part, and the lower part forms the second part. This structure is beneficial to reducing the width of the flow channel and increasing the lift.

[0009] Preferably, the first part includes two branch flow channels extending in the same direction corresponding to the upper part of the X-shaped structure, and each branch flow channel is connected to at least one first spray hole. In the operating state, each branch flow channel supplies water simultaneously and sprays water columns through the corresponding first spray holes respectively. Dividing the first part of the flow channel into two branch flow channels that can extend in the same direction reduces the number of first spray holes supplied by the independent flow channels, thereby reducing the pressure loss, making the jet flow rate of each first spray hole more stable, obtaining a greater lift under the condition of constant water inflow, and improving the spraying coverage rate of the spray hole jet at the same time.

[0010] Preferably, the second part includes an integral annular flow channel corresponding to the lower part of the X-shaped structure. The two ends of the lower part of the X-shaped structure are connected, and the water outlet is opened at the connection of the two ends of the lower part of the X-shaped structure. This structure is convenient for supplying water to the auxiliary spray arm and is beneficial to reducing the cross-sectional area of the water flow passing through. Under the condition of the same water inflow, a greater lift can be obtained and the cleaning effect can be improved. In addition, the second part of the flow channel is connected to the auxiliary spray arm at the corresponding water outlet. The annular structure makes the water flow come from two sources. At the water inlet of the auxiliary spray arm, the two water flows are in a head-on collision, and since the supply cross-sectional areas of the two water flows are the same and the flow rates of the two water flows are the same, the head-on collision forces of the two water flows are balanced with each other, and finally converge to form an upward water flow. In this way, the water flow will not form a 90° turning and rotating water flow like a single flow channel, but can make the force of the entire auxiliary spray arm in the vertical oncoming flow more uniform and stable, avoiding the problem of the left and right shaking of the auxiliary spray arm.

[0011] Preferably, the contraction structure is arranged at the connection section of the two branch flow channels and the water inlet. Adopting such a structure can reduce the cross-sectional area of the water flow passing through and obtain a greater lift under the condition of constant water inflow.

[0012] Preferably, at the junction of the branch flow channel and the water inlet, a first section with a gradually decreasing width along the water flow direction, a second section connected to the first section with a gradually increasing width, and a third section connected to the second section are provided. The first section, the second section, and the third section together form the contraction structure. With the above structure, a contraction structure is formed at the water inlet end of the first part to reduce the flow rate of the first part and distribute more flow to the second part.

[0013] Preferably, the body is provided with a V-shaped flow dividing wall arranged corresponding to the junction of the two branch flow channels, and the two outer peripheries of the V-shaped flow dividing wall respectively confine the corresponding first sections. Further preferably, the end of the V-shaped flow dividing wall is connected to the inner wall of the flow channel extending along the length direction of the body, and a transition section corresponding to the end of the V-shaped flow dividing wall is connected between the first section and the second section on the outer side wall of the flow channel. The above structure is beneficial to reducing the water flow energy loss in the first part of the flow channel.

[0014] Preferably, an S-shaped flow channel extending along the length direction is formed in the auxiliary spray arm. The water inlet of the auxiliary spray arm is opened at the bottom of the auxiliary spray arm and is arranged corresponding to the central part of the S-shaped flow channel. Some of the second spray holes are arranged near the first end of the S-shaped flow channel, and some of the second spray holes are arranged near the second end of the S-shaped flow channel. The number of the first spray holes in the present invention can be set to 2 - 8 according to needs, preferably 4 - 6, and further preferably 4. The number of the second spray holes can be the same as that of the first spray holes, preferably more than the number of the first spray holes. For example, it can be set to 2 - 16 according to needs, preferably 4 - 14, further preferably 6 - 12, and still further 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; or, 3 near the first end of the S-shaped flow channel, 1 in the middle of the extended part of the S-shaped flow channel where the 3 second spray holes are located (i.e., between the first end of the S-shaped flow channel and the water inlet), and 4 near the second end of the S-shaped flow channel. Under the condition of a certain flow rate, it can be known from the simulation results that one first spray hole can provide a spray coverage rate of 2% - 3%, while one second spray hole can provide at least a spray coverage rate of 8% - 10%. Therefore, the present invention reduces the number of the first spray holes and increases the number of the second spray holes to effectively improve the cleaning coverage rate on the basis of maintaining a high lift.

[0015] Preferably, a first hollow structure penetrating up and down is provided at the center of the body corresponding to the first part, and the first part of the flow channel is arranged around the first hollow structure. Preferably, a second hollow structure penetrating up and down is provided at the body corresponding to the second part, and the second part of the flow channel is arranged around the second hollow structure. This structure is beneficial to reducing the cross-sectional area of the water flow. Under the condition of the same inlet water flow rate, a greater lift can be obtained, improving the cleaning effect; the first hollow structure and the second hollow structure can also reduce the self-weight of the spray arm, enabling it to rotate more easily and stably, and being beneficial to improving the drainage and drying effects.

[0016] Preferably, a third hollow structure penetrating up and down is formed in the middle of the auxiliary spray arm, and the third hollow structure is divided into two sections and is respectively arranged corresponding to the two semi-surrounding areas of the S-shaped flow channel. The third hollow structure can reduce the self-weight of the auxiliary spray arm, enabling it to rotate more easily and stably, and is beneficial to improving the drainage and drying effects.

[0017] Preferably, the area of the main body corresponding to the second part sinks relative to the first part, thereby forming a receiving area above the second part, and the auxiliary spray arm is installed in this receiving area. This structure can make the height of the main body corresponding to the first part basically the same as the height of the auxiliary spray arm corresponding to the second part, thereby reducing the energy loss caused by the height difference of the water flow and reducing the influence on the lift.

[0018] Preferably, an air-adding structure is provided at the first spray hole and / or the second spray hole, which can make the water column ejected contain bubbles. With such a structure, the ejected water column contains bubbles, forming a high-energy bubble washing effect. When the bubbles contact the surface of the object to be cleaned, they burst, which can improve the peeling effect on pollutants and thus improve the cleaning effect.

[0019] Preferably, a top plate is provided at the top of the main body and is arranged at an interval from the main body. A first guide sleeve extending upward along the first spray hole is provided on the top wall of the main body. Correspondingly, a jet hole and a second guide sleeve extending upward along the jet hole are provided on the top plate. A gap for sucking gas into the jet is formed between the first guide sleeve and the second guide sleeve, and the upper end portion of the first guide sleeve extends into the second guide sleeve. With the above structure, the jet can be stably guided to avoid the divergence of the water flow, so as to improve the air suction effect and the jet lift.

[0020] Further preferably, an inclined surface with a gradually decreasing inner diameter in the water flow direction is formed on the inner wall of the second guide sleeve at least corresponding to the part of the first guide sleeve extending into it. This structure is beneficial to increasing the negative pressure at the gap and improving the air suction effect.

[0021] A cleaning machine includes a box body and also includes the above-mentioned spray arm, and the spray arm is rotatably arranged in the box body.

[0022] Compared with the prior art, the advantages of the present invention are as follows: The spray arm flow channel of the present invention is divided into a first part on the left side of the water inlet and a second part on the right side of the water inlet. The water in the first part of the flow channel is output directionally through the first spray holes, and the water in the second part of the flow channel is output through the water outlet and the auxiliary spray arm by rotation. Through the cooperation of the two parts, it is beneficial to improve the spray coverage rate on the basis of setting fewer spray holes and maintaining a high lift; at the same time, considering the extension and loss of the water flow in the vertical direction in the auxiliary spray arm, a contraction structure is provided at the first part of the flow channel to reduce the flow rate of the first part and make more flow rate distributed to the second part to balance the flow rates on both sides and ensure that the auxiliary spray arm can also maintain the required spray lift to improve the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the spray arm in the embodiment of the present invention; Figure 2 is Figure 1 exploded view of; Figure 3 is Figure 1 cross-sectional view of; Figure 4 is a schematic structural diagram of the flow channel of the spray arm in the embodiment of the present invention; Figure 5 is a schematic structural diagram of the flow channel of the auxiliary spray arm in the embodiment of the present invention; Figure 6 is a schematic diagram of the gas adding structure in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below with reference to the embodiments of the drawings.

[0025] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that if there appear such terms 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., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0027] In addition, if there appear such terms as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, if there appears the term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present invention, unless otherwise clearly specified and defined, if there appear such terms as "mounted", "connected", "joined", "fixed", etc., these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and defined, if there appears a description such as a first feature being "above" or "below" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present invention are only for the purpose of illustration and do not represent the only implementation.

[0031] As Figure 1 ~ 6, the spray arm for a washing machine in this embodiment includes a body 1 extending along the length direction. The body 1 is formed with a hollow flow channel 12 inside. An inlet 13 is provided in the middle of the body 1 to divide the flow channel 12 into a left and right arranged first part 121 and a second part 122. A first spray hole 11 communicating with the first part 121 and an outlet 14 communicating with the second part 122 are provided on the top wall of the body 1. The first spray hole 11 is arranged near the first end of the body 1 and communicates with the first part 121. The outlet 13 is arranged near the second end of the body 1 and communicates with the second part 122.

[0032] An auxiliary spray arm 2 communicating with the outlet 14 is rotatably connected above the body 1. A second spray hole 21 is provided on the auxiliary spray arm 2. A contraction structure is provided in the first part 121 near the inlet 13 for balancing the vertical stroke loss of the fluid in the second part 122.

[0033] With the above structure, the water in the first part 121 of the flow channel 12 is output directionally through the first spray hole 11, and the water in the second part 122 of the flow channel 12 is output rotationally through the outlet 14, the auxiliary spray arm 2 and the second spray hole 21. Through the cooperation of the two parts, it is beneficial to improve the spray coverage rate on the basis of setting fewer spray holes and maintaining a high lift. At the same time, considering the extension and loss of the water flow in the vertical direction in the auxiliary spray arm 2, a contraction structure is provided at the first part 121 of the flow channel 12 to reduce the flow rate of the first part 121 and distribute more flow rate to the second part 122 to balance the flow rate on both sides and ensure that the auxiliary spray arm 2 can also maintain the required spray lift.

[0034] In this embodiment, as Figure 4As shown, the flow channel 12 has an X-shaped structure. The central intersection of the X-shaped structure is arranged corresponding to the water inlet 13. The upper part of the X-shaped structure forms the first part 121, and the lower part forms the second part 122. The first part 121 includes two branch flow channels 1210 extending in the same direction corresponding to the upper part of the X-shaped structure. Each branch flow channel 1210 is communicated with at least one first spray hole 11. In the operating state, each branch flow channel 1210 supplies water simultaneously and sprays water columns through the corresponding first spray holes 11 respectively. The first part 121 of the flow channel is separated into two branch flow channels 1210 that can extend in the same direction, thus reducing the number of first spray holes 11 supplied by independent flow channels, thereby reducing the pressure loss, making the jet flow rate of each first spray hole 11 more stable, obtaining a greater lift under the condition of constant water inflow, and at the same time increasing the spray coverage rate of the spray hole jet.

[0035] The second part 122 includes an integral flow channel in a ring shape corresponding to the lower part of the X-shaped structure. The two ends of the lower part of the X-shaped structure are communicated with each other, and the water outlet 14 is opened at the connection of the two ends of the lower part of the X-shaped structure. This structure is convenient for supplying water to the auxiliary spray arm 2, which is beneficial to reducing the cross-sectional area of the water flow. Under the same water inflow condition, a greater lift can be obtained, improving the cleaning effect. In addition, the second part 122 of the flow channel 12 is connected to the auxiliary spray arm 2 corresponding to the water outlet 14. The ring-shaped structure makes the water source have two streams. At the water inlet 22 of the auxiliary spray arm 2, the two streams of water are in a head-on collision, and since the supply cross-sectional areas of the two streams of water are the same and the flow rates of the two streams of water are the same, the collision forces of the two streams of water are balanced with each other, and finally converge to form an upward water flow. In this way, the water flow will not form a 90° turning and rotating water flow like a single flow channel, but can make the entire auxiliary spray arm 2 more uniform and stable in the vertical oncoming flow force, avoiding the problem of the left and right shaking of the auxiliary spray arm 2.

[0036] The contraction structure of this embodiment is arranged at the connection section 011 between the two branch flow channels 1210 and the water inlet 13. At the connection of the branch flow channel 1210 and the water inlet 13, there is a first section 01 with a gradually decreasing width along the water flow direction, a second section 02 connected to the first section 01 with a gradually increasing width, and a third section 03 connected to the second section 02. The third section 03 can maintain a constant width and extend straight along the length direction of the body 1. With the above structure, a contraction structure is formed at the water inlet end of the first part 121 to reduce the flow rate of the first part 121 and make more flow rate distributed to the second part 122.

[0037] The main body 1 is provided with a V-shaped flow dividing wall 15 arranged corresponding to the junction of the two branch flow channels 1210. Corresponding first sections 01 are respectively constrained on the outer perimeters of both sides of the V-shaped flow dividing wall 15. Preferably, the end of the V-shaped flow dividing wall 15 is connected to the inner wall of the flow channel 12 extending along the length direction of the main body 1. A transition section corresponding to the end of the V-shaped flow dividing wall 15 is connected between the outer side wall of the flow channel 12 and the first section 01 and the second section 02. The above structure is beneficial to reducing the water flow energy loss of the first part 121 of the flow channel 12.

[0038] The first spray hole 11 of this embodiment is arranged near the first end of the main body 1 and is communicated with the first part 121. The auxiliary spray arm 2 is provided with second spray holes 21, and at least part of the second spray holes 21 are arranged near the end of the auxiliary spray arm 2. Preferably, an S-shaped flow channel 23 extending along the length direction is formed in the auxiliary spray arm 2. As Figure 5 shown, the water inlet 22 of the auxiliary spray arm 2 is opened at the bottom of the auxiliary spray arm 2 and is arranged corresponding to the central part of the S-shaped flow channel 23. Part of the second spray holes 21 are arranged near the first end of the S-shaped flow channel 23, and part of the second spray holes 21 are arranged near the second end of the S-shaped flow channel 23. The number of the first spray holes 11 can be set to 2 - 8 according to needs, preferably set to 4 - 6, and further preferably set to 4. The number of the second spray holes 21 can be the same as that of the first spray holes 11. Preferably, the number of the second spray holes 21 is more than that of the first spray holes 11. For example, it can be set to 2 - 16 according to needs, preferably 4 - 14, further preferably 6 - 12, and still further preferably set to 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; or, 3 are near the first end of the S-shaped flow channel 23, 1 is located in the middle of the extended part of the S-shaped flow channel 23 where these 3 second spray holes 21 are located (that is, between the first end of the S-shaped flow channel 23 and the water inlet), and 4 are near the second end of the S-shaped flow channel 23. Under the condition of a certain flow rate, it can be known from the simulation results that one first spray hole 11 can provide a spray coverage rate of 2% - 3%, while one second spray hole 21 can at least provide a spray coverage rate of 8% - 10%. Therefore, in this embodiment, the number of the first spray holes 11 is reduced and the number of the second spray holes 21 is increased to effectively improve the cleaning coverage rate on the basis of maintaining a high lift.

[0039] In this embodiment, as Figure 1 、 2, as shown in FIGS. 4 and 5, the body 1 is provided with a hollow structure that penetrates up and down, and the flow channel 12 is arranged around the periphery of the hollow structure. In this embodiment, a first hollow structure 100 may be provided at the first part 121 of the flow channel 12, and the first part 121 of the flow channel 12 is arranged around the first hollow structure 100; a second hollow structure 200 is provided at the second part 122 of the flow channel 12, and the second part 122 of the flow channel 12 is arranged around the second hollow structure 200. The above-mentioned hollow structure penetrates the body 1 of the spray arm up and down, which can reduce the cross-sectional area of the water flow, obtain a greater head under the condition of constant water inflow, and can also reduce the self-weight of the spray arm, making it easier and more stable to rotate. At the same time, the use of the hollow structure is also beneficial to improving the drainage and drying effects. The hollow structure can better reduce the material consumption of the spray arm. When adding an auxiliary spray arm, the overall material consumption is nearly 10% less than that of the existing structure, and the cost can be reduced by 10%.

[0040] As Figure 1 , 2 , as shown in FIGS. 5, a third hollow structure 300 is formed in the middle of the auxiliary spray arm 2. The third hollow structure 300 is in two sections and is respectively arranged corresponding to the two semi-surrounding areas above and below the S-shaped flow channel 23. The third hollow structure 300 can reduce the self-weight of the auxiliary spray arm 2, making it easier and more stable to rotate, and is beneficial to improving the drainage and drying effects.

[0041] A diversion surface 101 is formed on the upper surface of the body 1 and is arranged around the hollow structure and gradually decreases from the outer edge to the hollow structure. The hollow structure constitutes a water guide port for guiding the accumulated water converged by the diversion surface 101 downward. The above structure can timely drain the accumulated water on the upper surface of the body 1 to achieve no remaining water on the surface of the spray arm.

[0042] In this embodiment, the area of the body 1 corresponding to the second part 122 sinks relative to the first part 121, so as to form a receiving area above the second part 122, and the auxiliary spray arm 2 is installed in this receiving area. This structure can make the height of the body 1 corresponding to the first part 121 basically the same as the height of the auxiliary spray arm 2 corresponding to the second part 122, thereby eliminating the energy loss caused by the water height difference and reducing the impact on the head.

[0043] In this embodiment, as Figure 1 , 2As shown in FIGS. 6, air - adding structures are provided at the first spray hole 11 and the second spray hole 21, which can make the water column ejected carry bubbles. With such a structure, the ejected water column carries bubbles, forming a high - energy bubble cleaning effect. When the bubbles contact the surface of the object to be cleaned, they burst, which can improve the peeling effect on pollutants and thus improve the cleaning effect. The air - adding structures at the first spray hole 11 and the second spray hole 21 are the same. In this embodiment, the air - adding structure at the first spray hole 11 is taken as an example for detailed description. A top plate 17 is arranged at the top of the body 1 at an interval from it. A first diversion sleeve 111 extending upward along the first spray hole 11 is arranged on the top wall of the body 1. Correspondingly, a jet hole 171 and a second diversion sleeve 172 extending upward along the jet hole 171 are formed on the top plate 17. A gap 170 for gas to be inhaled into the jet is formed between the first diversion sleeve 111 and the second diversion sleeve 172, and the upper end part of the first diversion sleeve 111 extends into the second diversion sleeve 172. With the above - mentioned structure, the jet can be stably guided to avoid the divergence of the water flow, so as to improve the air - suction effect and the jet lift. The inner wall of the second diversion sleeve 172 forms an inclined surface 173 with a gradually decreasing inner diameter along the water flow direction at least at the part corresponding to the first diversion sleeve 111 extending into it. This structure is beneficial to increasing the negative pressure at the gap and improving the air - suction effect.

[0044] The cleaning machine of this embodiment includes a box body and also includes the above - mentioned spray arm, and the spray arm is rotatably arranged in the box body.

[0045] The technical features of the above - mentioned embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above - mentioned embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as the scope recorded in this specification.

[0046] The above - mentioned embodiments only express several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of this invention patent shall be subject to the appended claims.

Claims

1. A spray arm for a cleaning machine, comprising a body (1) extending in the length direction, wherein the body (1) is provided with a water inlet (13) and a first spray hole (11), and is characterized in that: The body (1) is formed with a flow channel (12) that is hollow inside. The water inlet is arranged in the middle of the body (1) and divides the flow channel (12) into a first part (121) and a second part (122) that are arranged left and right. The first spray hole (11) is arranged near the first end of the body (1) and is communicated with the first part. The body (1) is provided with a water outlet (14) that is arranged near its second end and is communicated with the second part. An auxiliary spray arm (2) is rotatably connected at the water outlet (14), and a second spray hole (21) is formed in the auxiliary spray arm (2). The first part (121) outputs water flow through the first spray hole (11). The second part (122) outputs water flow through the water outlet (14), the auxiliary spray arm (2), and the second spray hole (21). The first part (121) is provided with a contraction structure that is arranged near the water inlet (13) and is used to balance the vertical stroke loss of the fluid in the second part.

2. The spray arm for a cleaning machine according to claim 1, wherein: The flow channel (12) is in an X-shaped structure. The central intersection of the X-shaped structure is arranged corresponding to the water inlet (13). The upper part of the X-shaped structure constitutes the first part (121), and the lower part constitutes the second part (122).

3. The spray arm for a cleaning machine according to claim 2, characterized in that: The first part (121) includes two branch flow channels (1210) that extend in the same direction corresponding to the upper part of the X-shaped structure. Each branch flow channel (1210) is communicated with at least one first spray hole (11). In the operating state, each branch flow channel (1210) supplies water simultaneously and sprays water columns through the corresponding first spray hole (11).

4. The spray arm for a cleaning machine according to claim 2, characterized in that: The second part (122) includes an integral annular flow channel corresponding to the lower part of the X-shaped structure. The two ends of the lower part of the X-shaped structure are communicated with each other. The water outlet (14) is formed at the connection of the two ends of the lower part of the X-shaped structure.

5. The spray arm for a cleaning machine according to claim 3, characterized in that: The contraction structure is arranged at the connection section (011) of the two branch flow channels (1210) and the water inlet (13).

6. The spray arm for a cleaning machine according to claim 5, characterized in that: At the connection of the branch flow channel (1210) and the water inlet (13), there is a first section (01) whose width gradually decreases along the water flow direction, a second section (02) that is connected to the first section (01) and whose width gradually increases, and a third section (03) that is connected to the second section (02). The first section (01), the second section (02), and the third section (03) together form the contraction structure.

7. The spray arm for a cleaning machine according to claim 6, characterized in that: The body (1) is provided with a V-shaped diversion wall (15) that is arranged corresponding to the connection of the two branch flow channels (1210). The outer peripheries on both sides of the V-shaped diversion wall (15) respectively confine the corresponding first sections (01).

8. The spray arm for a cleaning machine according to claim 7, characterized in that: The end of the V-shaped diversion wall (15) is connected to the inner wall of the flow channel (12) that extends along the length direction of the body (1). A transition section corresponding to the end of the V-shaped diversion wall (15) is connected between the outer side wall of the flow channel (12) at the first section (01) and the second section (02).

9. The spray arm for a cleaning machine according to any one of claims 1 to 8, characterized in that: An S-shaped flow channel (23) extending in the longitudinal direction is formed in the auxiliary spray arm (2). The water inlet (22) of the auxiliary spray arm (2) is opened 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 spray holes (21) are arranged near the first end of the S-shaped flow channel (23), and some of the second spray holes (21) are arranged near the second end of the S-shaped flow channel (23).

10. The spray arm for a cleaning machine according to any one of claims 1 to 8, characterized in that: A first hollow structure (100) penetrating up and down is provided at the center of the main body (1) corresponding to the first part (121). The first part (121) of the flow channel (12) is arranged around the first hollow structure (100).

11. The spray arm for a washing machine according to claim 10, characterized in that: A second hollow structure (200) penetrating up and down is provided at the main body (1) corresponding to the second part (122). The second part (122) of the flow channel (12) is arranged around the second hollow structure (200).

12. The spray arm for a cleaning machine according to any one of claims 1 to 8, characterized in that: The area of the main body (1) corresponding to the second part (122) sinks relative to the first part (121), so as to form a receiving area above the second part (122), and the auxiliary spray arm (2) is installed in this receiving area.

13. The spray arm for a cleaning machine according to claim 9, wherein: A third hollow structure (300) penetrating up and down is formed in the middle of the auxiliary spray arm (2). The third hollow structure (300) is in two sections and is respectively arranged corresponding to the two semi-surrounding areas of the S-shaped flow channel (23).

14. The spray arm for a cleaning machine according to any one of claims 1 to 8, characterized in that: An air-adding structure capable of making the sprayed water column carry bubbles is provided at the first spray hole (11) and / or the second spray hole (21).

15. The spray arm for a cleaning machine according to claim 14, characterized in that: A top plate (17) spaced from the top of the main body (1) is provided at the top of the main body (1). A first flow guide sleeve (111) extending upward along the first spray hole (11) is provided on the top wall of the main body (1). Correspondingly, a jet hole (171) and a second flow guide sleeve (172) extending upward along the jet hole (171) are opened on the top plate (17). A gap (170) for sucking gas into the jet is formed between the first flow guide sleeve (111) and the second flow guide sleeve (172). The upper end part of the first flow guide sleeve (111) extends into the second flow guide sleeve (172).

16. The spray arm for a cleaning machine according to claim 15, characterized in that: The inner wall of the second flow guide sleeve (172) forms an inclined surface (173) with a gradually decreasing inner diameter in the water flow direction at least corresponding to the part of the first flow guide sleeve (111) extending into it.

17. A cleaning machine, comprising a box body, characterized in that: It also includes the spray arm according to any one of claims 1 to 16, and the spray arm is rotatably arranged in the box body.

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