Spray arm for cleaning machine, cleaning machine and control method of spray arm

Abstract

The present invention relates to a spray arm for a washing machine, a washing machine and a control method for the spray arm. The spray arm body is strip-shaped, has an inner cavity, and is provided with a water inlet and a plurality of spray holes, all of which are fluidically connected to the inner cavity. The spray holes are distributed in groups, and each spray hole group has a plurality of spray holes arranged in a wavy curve. The spray hole groups are spaced apart along the length direction of the spray arm. The water jets sprayed from the spray hole groups can perform reciprocating friction cleaning on tableware, thereby enhancing the cleaning effect on stubborn stains and expanding the cleaning area.

Description

Technical Field

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

[0002] Existing dishwasher spray arms typically adopt a linear or star-shaped structure, washing by rotating around a central axis. These spray arms utilize a cavity structure with water outlets in the cavity wall. Once connected to the water circuit, the spray arms can perform water washing under the action of water pressure, and the water jets also drive the spray arms to rotate.

[0003] For example, in the Chinese utility model patent disclosed with patent number CN202120988032.2 (publication number CN215838899U), "Spray arm for cleaning machine and cleaning machine using the spray arm", the spray arm has a main body extending along the length direction, a water inlet is opened in the middle of the top wall of the main body, the main body has a flow channel connected to the water inlet and extending along the length direction of the main body, a spray hole connected to the flow channel is opened on the top wall of the main body, and a water spray port connected to the flow channel and used to balance the rotation speed of the spray arm is opened on the side wall of the main body, and the water spray port is arranged near the end of the main body.

[0004] Dishware is typically arranged in a clockwise or counterclockwise direction within the dishwasher chamber, and the spray arm rotates unidirectionally, as shown in the aforementioned patent. Therefore, the water jets generated by the spray holes on the dishes are unidirectional. For example, if a specific location on the dishware is used, the water jets from one or more of the spray holes on the spray arm will only hit that location briefly. After the spray arm rotates one full circle, the water jets are rinsed again, and this cycle repeats. However, this approach is ineffective for cleaning stubborn stains. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a spray arm for a washing machine capable of repeatedly washing tableware in view of the current status of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a spray arm for a washing machine that can further repeatedly wash tableware in response to the current status of the existing technology.

[0007] The third technical problem to be solved by the present invention is to provide a spray arm for a cleaning machine with good sealing performance between the movable arm and the water inlet seat in view of the current status of the existing technology.

[0008] The fourth technical problem to be solved by the present invention is to provide a cleaning machine with a large cleaning range and using the above-mentioned spray arm in view of the current status of the existing technology.

[0009] The fifth technical problem to be solved by the present invention is to provide a control method for a spray arm that can repeatedly wash tableware in response to the current status of the existing technology.

[0010] The present invention solves the first technical problem by adopting the following technical solution: a spray arm for a cleaning machine, the main body of which is strip-shaped, has an inner cavity, and is provided with a water inlet and a plurality of spray holes all in fluid communication with the inner cavity;

[0011] The feature is that the spray holes are distributed in groups, each spray hole group has a plurality of spray holes arranged in a wave-like curve, and the spray hole groups are spaced apart along the length direction of the spray arm.

[0012] To facilitate calculation of the displacement of the water jets on the tableware, the nozzles of each nozzle group are arranged in a sinusoidal pattern. The displacement of the water jets on the tableware can be calculated based on the amplitude of the nozzle group. If the displacement is not appropriate, the nozzle group with the appropriate amplitude can be replaced.

[0013] For ease of processing, the multiple spray holes of each spray hole group are interconnected, so that the spray hole group is in a continuous strip shape; or, in order to ensure the strength of the spray arm, the multiple spray holes of each spray hole group are spaced apart from each other. Compared with the strip-shaped spray hole group, this method causes less damage to the spray arm, and each spray hole can spray out a water column, which will have a better cleaning effect.

[0014] Because tableware is usually located obliquely above the spray hole, the water column usually needs to be shot out obliquely upward. If the spray hole is opened on a plane, the spray hole needs to be set at an angle, which is more inconvenient. Therefore, a number of protrusions that is the same as the number of spray holes is provided on the upper wall of the spray arm. Each of the protrusions is in the shape of a hemisphere with a hollow interior, and each group of spray holes is correspondingly arranged on the spherical surface of a protrusion. Because the spherical surface is inclined relative to the upper wall of the spray arm, the holes opened on the spherical surface, except for the hole at the top of the spherical surface, are inclined relative to the upper wall of the spray arm. This makes it simpler to open the spray holes.

[0015] In order to facilitate the replacement of the amplitude of the nozzle group to achieve the desired cleaning effect, the protrusion is detachably connected to the upper wall of the spray arm. When a nozzle group with a different amplitude needs to be replaced, the protrusion can be removed and replaced with a protrusion of the appropriate nozzle group amplitude.

[0016] The technical solution adopted by the present invention to solve the above second technical problem is: the spray arm includes

[0017] A water inlet seat, the interior of which is hollow to form a flow channel, and a water inlet is provided on the water inlet seat and is fluidically connected to the flow channel;

[0018] The movable arm is strip-shaped, one end of the movable arm is connected to the water inlet seat, and the other end extends in a direction away from the water inlet seat. The interior of the movable arm is hollow to form a channel connected to the fluid of the flow channel. The movable arm is provided with a spray hole connected to the fluid of the channel. Under the action of water pressure, the movable arm can move in a first direction toward the water inlet seat or in a second direction away from the water inlet seat.

[0019] The technical solution adopted by the present invention to solve the third technical problem is: a stopper is provided on the movable arm; the spray arm also includes

[0020] a first position-limiting member movably mounted on the water inlet seat, and the first position-limiting member can move relative to the water inlet seat along the length direction of the movable arm, and the first position-limiting member is provided with a first position-limiting portion;

[0021] a first elastic member acting on the first limiting member to ensure that the first limiting member always maintains a tendency to move along the first direction;

[0022] A second limiting member is movably mounted on the water inlet seat, and the second limiting member can move relative to the water inlet seat along the length direction of the movable arm. The second limiting member is provided with a second limiting portion, and along the direction of water flow, the second limiting portion is located upstream of the first limiting portion, and the blocking portion can slide between the first limiting portion and the second limiting portion and abut against one of the first limiting portion and the second limiting portion;

[0023] The second elastic member acts on the second limiting member to ensure that the second limiting member always maintains a tendency to move along the second direction.

[0024] In order to further extend the maximum length of the spray structure, the first limiting member is in the shape of a tube with open ends. The first end of the first limiting member can be inserted into the flow channel of the water inlet seat along its axial movement, and the second end of the first limiting member can be inserted into the channel of the movable arm along its axial movement. The first limiting portion is arranged on the outer peripheral wall of the first limiting member and is arranged adjacent to the second end of the first limiting member. The first limiting member is in the shape of a tube, which can not only connect the water inlet seat and the movable arm, but also the two ends of the first limiting member are inserted into the water inlet seat and the movable arm respectively, which is equivalent to the water inlet seat and the movable arm not being directly connected. Under the action of water pressure, the movable arm and the first limiting member can both move in the second direction, so that the overall length of the spray structure is longer. Compared with the first limiting member, which has other structural forms, such as strip-shaped, the water inlet seat and the movable arm are inserted into and matched with each other.

[0025] In the above embodiment, to facilitate insertion of the second end of the first stopper into the passage of the movable arm, the first stopper is elastically deformed by compression, and the outer wall of the first stopper forms a first tapered surface that gradually tapers in diameter along the direction of insertion of the first stopper into the passage. During insertion of the first stopper into the passage, the first stopper is compressed and deformed by the stopper, allowing the first stopper to pass over the stopper. After passing over the stopper, the first stopper returns to its original shape and can abut against the stopper.

[0026] In order to guide the moving trajectory of the first limiter, the water inlet seat includes a seat body and a guide tube with one end provided on the seat body, the other end of the guide tube extends in a direction away from the seat body, the seat body and the guide tube are both hollow inside and connected to form the flow channel, the first limiter is inserted in the guide tube and can move axially along the guide tube, and the guide tube serves to guide the moving trajectory of the first limiter.

[0027] To prevent the first stopper from disengaging from the guide tube, a first limiting structure is provided between the first stopper and the guide tube to limit the travel of the first stopper. The first limiting structure includes a first chute and a first slider movable within the first chute. The first slider is elastically deformable. The first chute is provided on one of the outer peripheral wall of the first stopper and the inner wall of the guide tube, and the first slider is provided on the other of the outer peripheral wall of the first stopper and the inner wall of the guide tube. The first chute is closed at both ends and extends along the length of the movable arm. When the first slider abuts against the end of the first chute, the first stopper reaches its limit position and cannot move further, but can only move in the opposite direction.

[0028] To prevent the first slider from interfering with the inner wall of the guide tube, which could prevent the first stopper from being inserted into the guide tube, the first slider is mounted on the first stopper. The outer wall of the first slider forms a second inclined surface that slopes toward the centerline of the first stopper, along the direction in which the first stopper is inserted into the guide tube. During insertion of the first stopper into the guide tube, the first slider is squeezed and deformed by the inner wall of the guide tube until it reaches the first chute, whereupon it returns to its original shape and fits into the first chute.

[0029] The second position-limiting member can have various structural forms, such as a strip-shaped member with one end mounted on the guide tube and the other end provided with a second position-limiting portion. Preferably, the second position-limiting member is also tubular, with the first end of the second position-limiting member being movably mounted on the guide tube. This structure of the second position-limiting member not only facilitates its coordination with the guide tube and the movable arm, but also, because the second position-limiting member is mounted on the guide tube, the guide tube effectively positions and guides the second position-limiting member, eliminating the need for a separate member to position and guide the second position-limiting member.

[0030] To prevent the second stopper from disengaging from the guide tube, a second slot is defined on the outer wall of the guide tube. A second slider is provided on the inner wall of the second stopper, capable of moving along the second slot. The second slot is closed at both ends and extends along the length of the movable arm. When the second slider abuts against the end of the second slot, the second stopper reaches its limit position and can only move in the reverse direction.

[0031] To prevent the second slider from interfering with the outer wall of the guide tube, which would prevent the second stopper from being installed on the guide tube, the second slider is elastically deformable. Its outer wall forms a third inclined surface that slopes away from the centerline of the second stopper, along the direction in which the second stopper is installed on the guide tube. During installation of the second stopper on the guide tube, the second slider is squeezed and deformed by the outer wall of the guide tube until it reaches the second chute, whereupon it returns to its original shape and fits into the second chute.

[0032] In order to improve the sealing performance between the first limiting portion and the blocking portion, a first sealing ring is further provided on the end surface of the first limiting portion facing the blocking portion.

[0033] In order to improve the sealing between the second limiting portion and the blocking portion, a second sealing ring is further provided on the end surface of the second limiting portion facing the blocking portion.

[0034] In order to further increase the spraying range of the spray arm, there are two movable arms and they are symmetrically arranged on the water inlet seat, so that the two movable arms can move relative to the water inlet seat, further extending the overall length of the spray arm.

[0035] The technical solution adopted by the present invention to solve the fourth technical problem is: a cleaning machine using the above-mentioned spray arm, characterized in that it also includes a box body with a chamber, the spray arm is arranged in the chamber, and the water inlet seat can rotate relative to the chamber.

[0036] The technical solution adopted by the present invention to solve the fifth technical problem is: a control method for a spray arm: the spray arm is driven to rotate by a motor; the control method comprises the following steps

[0037] (1) Setting the maximum amplitude value Y of the expected displacement of the water column sprayed by the nozzle group on the tableware;

[0038] (2) Calculate the amplitude X2 of the nozzle group. The amplitude of the water column generated by the nozzle group corresponding to the displacement on the tableware is Y2;

[0039] (3) Under a certain water volume V, the motor speed is adjusted to change in the range [N1, N2] according to the sine law, and the amplitude X1 of the displacement of the moving arm is measured. The displacement of the moving arm makes the amplitude of the displacement of the water column generated by the nozzle on the tableware Y1, where Y is the sum of the maximum value of Y1 and the maximum value of Y2;

[0040] (4) Determine whether Y reaches the expected value. If so, end the process. If not, return to step (3) and change the motor speed range [N1, N2] until the set displacement Y is reached.

[0041] in

[0042] Wherein α1 is the angle between the water column generated by the nozzle group and the horizontal plane; β1 is the angle between the surface where the open end of the tableware is located and the horizontal plane.

[0043] In order to facilitate achieving the expected Y value, the upper wall surface of the spray arm is provided with convex parts whose number is the same as the number of the spray hole groups, each of the convex parts is in the shape of a hemispherical hollow interior, each group of the spray hole groups is correspondingly arranged on the spherical surface of a convex part (5), and each convex part is detachably connected to the upper wall surface of the spray arm;

[0044] In the step, if the expected value is not reached, return to the step, change the motor speed range [N1, N2], and / or change the amplitude X2 of the spray hole group of the spray arm until the set displacement Y is reached.

[0045] In this way, not only by adjusting X1, but also by replacing the convex parts with different amplitudes of the spray hole, the X2 value can be adjusted synchronously to achieve the expected Y value.

[0046] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention arranges the spray holes of the spray hole group in a wave shape, so that the water column sprayed by the spray hole group can perform reciprocating friction cleaning on the tableware, thereby enhancing the cleaning effect of stubborn stains and expanding the cleaning area; because a certain position on the tableware is rinsed by water sprayed by a spray hole of the spray hole group, it will soon be rinsed by water sprayed by the next spray hole, so that the specific position on the tableware can be continuously rinsed, forming a reciprocating oscillating water flow at the specific position, thereby improving the cleaning effect; in addition, because the spray holes are in a wave shape, the tableware can be sprayed from different directions, and the cleaning effect is better than that of unidirectional spraying.

[0047] 2. The movable arm of the present invention can move back and forth relative to the water inlet seat. Due to the movement of the movable arm, the position of the spray hole on the movable arm will change. After a certain spray hole sprays a certain position on the tableware, another spray hole will soon move to a state where it can spray that position without waiting for the spray arm to rotate a circle. In this way, the position on the tableware can be continuously rinsed, forming a reciprocating oscillating water flow at the specific position, thereby improving the cleaning effect. In addition, due to the movement of the spray arm, the water column can flush a certain position on the tableware from different directions, further improving the cleaning effect.

[0048] 3. During the rotation of the water inlet seat of the present invention, the movable arm and the first stopper will move away from the water inlet seat due to the effects of centrifugal force and water pressure. When the rotation speed of the water inlet seat increases, the movable arm moves away from the water inlet seat. Because the first stopper can also move away from the water inlet seat, but is constrained by the first elastic member, at the same rotation speed of the water inlet seat, the movement stroke of the first stopper is smaller than that of the movable arm, causing the stopper of the movable arm to abut and tightly contact the first stopper, thereby preventing water leakage.

[0049] When the rotation speed becomes smaller, the movable arm moves toward the direction close to the water inlet seat. Since the second limit member can also move toward the direction close to the water inlet seat, but is constrained by the second elastic member, at the same rotation speed of the water inlet seat, the moving stroke of the second limit member is smaller than the moving stroke of the movable arm, so that the blocking part of the movable arm is against and in close contact with the second limit part to prevent water leakage.

[0050] In summary, the blocking portion of the movable arm can always resist one of the first limiting portion and the second limiting portion, so that when the movable arm moves relative to the water inlet seat, water flows from the water inlet seat into the movable arm without leakage.

[0051] The spray arm of the present invention includes a water inlet seat and a movable arm, and the movable arm can move relative to the water inlet seat, thereby extending the overall length of the spray arm and increasing the spray range. When the spray arm is used on a cleaning machine, due to the large spray range, there are fewer blind spots in cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0053] Figure 2 for Figure 1 sectional view of

[0054] Figure 3 This is a schematic structural diagram of Example 2 of the present invention;

[0055] Figure 4 for Figure 2 A schematic diagram of the structure of one of the moving arms;

[0056] Figure 5 for Figure 2 sectional view of

[0057] Figure 6 relative to Figure 4 Reverse section view;

[0058] Figure 7 for Figure 2 Schematic diagram of the decomposition;

[0059] Figure 8 for Figure 4 Schematic diagram of the decomposition;

[0060] Figure 9 for Figure 2 A schematic structural diagram of the second limiting member in FIG.

[0061] Figure 10 for Figure 2 A schematic structural diagram of the first limiting member in FIG.

[0062] Figure 11 The displacement of the water column on the tableware is generated by the sinusoidal curve of the nozzle;

[0063] Figure 12 The displacement of the water column on the tableware is generated by the movement of the arm and the nozzle;

[0064] Figure 13 A schematic diagram of a sine curve.

[0065] Figure 14 This is a cross-sectional view of Example 3 of the present invention. DETAILED DESCRIPTION

[0066] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0067] Example 1

[0068] like Figure 1 、 2 As shown, the cleaning machine of this preferred embodiment includes a housing (not shown) and a spray arm 6. The housing has a chamber, and the spray arm 6 is rotatably arranged in the chamber. The spray arm 6 is connected to a motor drive so that the spray arm 6 can rotate. The motor can directly drive the spray arm 6, or it can be indirectly connected through other intermediate components. For example, the motor drives the impeller to rotate to pump water, and the water flow drives the spray arm 6 to rotate, as shown in CN202010288565.X "A Cleaning Machine".

[0069] The spray arm 6 has an inner cavity 10. It is equipped with a water inlet 12 and multiple spray hole groups 22, all of which are in fluid communication with the inner cavity 10. Each spray hole group 22 has multiple spray holes 221 arranged in a wavy curve. Specifically, the spray holes 221 are distributed in groups, and the spray hole groups 22 are spaced apart along the length of the spray arm 6. In this embodiment, the multiple spray holes 221 in each spray hole group 22 are arranged in a sinusoidal curve, and the multiple spray holes 221 in each spray hole group 22 are spaced apart from each other.

[0070] The upper wall surface of the spray arm 6 is provided with convex parts 5 whose number is the same as the number of the spray hole groups 22 . Each convex part 5 is in a hemispherical shape with a hollow interior, and each spray hole group 22 is correspondingly arranged on the spherical surface of a convex part 5 .

[0071] The spray hole group 22 arranged in a wavy curve has a wavy trajectory at a certain angle position of the contact point with the tableware 7 under the rotation of the spray arm 6, so that the water column sprayed by the spray hole group 22 can perform reciprocating friction cleaning on the tableware, enhance the cleaning effect of stubborn stains, and expand the cleaning area; because after a certain position on the tableware 7 is rinsed by water sprayed by a certain spray hole, it will soon be rinsed by water sprayed by the next spray hole 221, so that the specific position on the tableware 7 can be continuously rinsed, forming a reciprocating oscillating water flow at the specific position, thereby improving the cleaning effect.

[0072] Example 2

[0073] like Figures 3 to 12 As shown, the difference between this embodiment and embodiment 1 is:

[0074] 1. The multiple spray holes 221 of each spray hole group 22 are connected to each other.

[0075] 2. The spray arm 6 of this embodiment includes a water inlet seat 1, a movable arm 2, a first limiter 3, a second limiter 4, a first elastic member 30, a second elastic member 40, etc.

[0076] The water inlet seat 1 can rotate relative to the chamber of the box, such as Figure 2 、 3 As shown, the water inlet seat 1 is hollow inside to form a flow channel 11, and a water inlet 12 is provided on the water inlet seat 1 to be fluidically connected to the flow channel 11. The water inlet seat 1 can be provided with a water outlet to be fluidically connected to the flow channel 11, or of course, the water outlet can also be not provided.

[0077] In this embodiment, the water inlet seat 1 includes a seat body 1a and a guide tube 1b with one end provided on the seat body 1a, and the other end of the guide tube 112 extends in a direction away from the seat body 1a. The seat body 1a and the guide tube 1b are both hollow inside and connected to form a flow channel 11. The internal hollow area in the seat body 1a forms a water collecting chamber 111, and the internal hollow area of the guide tube 1b forms a diversion channel 112. The diversion channel 112 extends outward from the peripheral wall of the water collecting chamber 111, the water inlet 12 is fluidically connected to the water collecting chamber 111, and the channel 21 of the movable arm 2 is fluidically connected to the diversion channel 112 to increase the impact force of the water pressure on the movable arm 2.

[0078] The movable arm 2 is strip-shaped, with one end connected to the water inlet seat 1 via a first stopper 3 and a second stopper 4, and the other end extending away from the water inlet seat 1. The movable arm 2 is hollow within a channel 21 extending along its length. This channel 21 is fluidically connected to the flow channel 11, and together, the channel 21 and the flow channel 11 form the inner cavity 10 of the spray arm 6. The movable arm 2 is provided with a spray hole group 22 that is fluidically connected to the channel 21. Under the action of water pressure, the movable arm 2 can move in a first direction toward the water inlet seat 1 or in a second direction away from the water inlet seat 2.

[0079] like Figure 4 、 6 As shown in Figures 7 and 9, the first limiting member 3 is in the shape of a tube with open ends. The first end of the first limiting member 3 can be inserted into the guide tube 1b and can move axially along the guide tube 1b, and the inner wall surface of the first end of the first limiting member 3 is in the shape of a cone with a diameter gradually decreasing along the direction of water flow, so that the water can flow smoothly from the flow channel 11 into the channel 21.

[0080] A first slider 31 (which can be made of elastic material) that can be elastically deformed is provided on the outer peripheral wall of the first limiting member 3, and a first slide groove 13 is provided on the inner wall surface of the guide tube 1b. The two ends of the first slide groove 13 are closed and extend along the length direction of the movable arm 2. The first slider 31 can move in the first slide groove 13. When the first slider 31 abuts against the end of the first slide groove 13, the first limiting member 3 moves to the extreme position and cannot move further, and can only move in the opposite direction. The first slider 31 and the first slide groove 13 together constitute a first limiting structure for limiting the moving stroke of the first limiting member 3 to prevent the first limiting member 3 from detaching from the guide tube 1b under the action of water pressure.

[0081] Of course, the first slider 31 can also be positioned on the guide tube 1b and the first chute 13 on the first stopper 3. However, because the first slider 31 is likely to interfere with the first stopper 3 during insertion, the design of this embodiment is preferred. The outer wall of the first slider 31 forms a second inclined surface 311 that slopes toward the centerline of the first stopper 3, along the direction in which the first stopper 3 is inserted into the guide tube 1b. During insertion of the first stopper 3 into the guide tube 1b, the first slider 31 is squeezed and deformed by the inner wall of the guide tube 1b until the first slider 31 moves to the first chute 13, whereupon the first slider 31 returns to its original shape and fits into the first chute 13. This prevents the first slider 31 from interfering with the inner wall of the guide tube 1b, which could prevent the first stopper 3 from being inserted into the guide tube 1b.

[0082] The second end of the first limiting member 3 is inserted into the channel 21 of the movable arm 2 so as to be movable along the axial direction thereof. Figure 4 、 9 As shown, a first limiting portion 32 is provided on the outer peripheral wall of the first limiting member 3 at a position adjacent to its second end, and a blocking portion 23 is provided at the water inlet end of the channel 21 of the movable arm 2. The first limiting portion 32 can be abutted against the blocking portion 23, and the blocking portion 23 serves to limit the first limiting member 3 from separating from the channel 21 of the movable arm 2.

[0083] To facilitate insertion of the second end of the first limiting member 3 into the channel 21 of the movable arm 2, the first limiting portion 32 is elastically deformable (and can be made of an elastic material). The outer wall of the first limiting portion 32 forms a first tapered surface 321 that gradually decreases in diameter along the direction in which the first limiting member 3 is inserted into the channel 21. During insertion of the first limiting member 3 into the channel 21, the first limiting portion 32 is squeezed and deformed by the stopper 23 to allow the first limiting member 3 to pass over the stopper 23. After passing over the stopper 23, the first limiting portion 32 returns to its original shape and can abut against the stopper 23.

[0084] The first limiting member 3 can reciprocate along its axial direction under the action of water pressure. The first elastic member 30 acts on the first limiting member 3 to make the first limiting member 3 always maintain a tendency to move along the first direction, that is, toward the water inlet seat 1.

[0085] like Figure 4 、 8 As shown, the second stopper 4 is also tubular and extends along the length of the movable arm 2. The first end of the second stopper 4 is sleeved onto the guide tube 1b. A second chute 14 is defined on the outer wall of the guide tube 1b. A second slider 41 is provided on the inner wall of the second stopper 4, capable of moving along the second chute 14. The second chute 14 is closed at both ends and extends along the length of the movable arm 2. When the second slider 41 abuts the end of the second chute 14, the second stopper 4 reaches its limit position and cannot move further, forcing it to move in the opposite direction, preventing it from detaching from the guide tube 1b.

[0086] The second slider 41 is elastically deformable (and can be made of an elastic material). The outer wall of the second slider 41 forms a third inclined surface 411 that slopes away from the centerline of the second limiter 4, along the direction in which the second limiter 4 is fitted onto the guide tube 1b. During the process of fitting the second limiter 4 onto the guide tube 1b, the second slider 41 is squeezed and deformed by the outer wall of the guide tube 1b until it reaches the second chute 14. At this point, the second slider 41 returns to its original shape and fits into the second chute 14, preventing interference between the second slider 41 and the outer wall of the guide tube 1b, which could prevent the second limiter 4 from fitting onto the guide tube 1b.

[0087] The second end of the second limiting member 4 extends toward the movable arm 2, and the second end of the second limiting member 4 is provided with a second limiting portion 42. Along the direction of water flow, the second limiting portion 42 is located upstream of the first limiting portion 32, and the blocking portion 23 can slide between the first limiting portion 32 and the second limiting portion 42 and abut against one of the first limiting portion 32 and the second limiting portion 42.

[0088] The second stopper 4 is movable along the length of the movable arm 2 under the action of water pressure. The second elastic member 40 acts on the second stopper 4, ensuring that the second stopper 4 always maintains a tendency to move in the second direction, i.e., away from the water inlet seat 1. In this embodiment, the first elastic member 30 and the second elastic member 40 are both springs mounted on the main body 1. One end of the first elastic member 30 abuts against the baffle 34 on the first stopper 3, and one end of the second elastic member 40 abuts against the second stopper 42.

[0089] The working process of the spray arm of this embodiment is as follows:

[0090] During the rotation of the water inlet seat 1, the movable arm 2 moves away from the water inlet seat 1 due to the centrifugal force and water pressure. When the speed of the water inlet seat 1 increases, the movable arm 2 moves away from the water inlet seat 1. Because the first limiter 3 can also move away from the water inlet seat 1, but is constrained by the first elastic member 30, at the same speed of the water inlet seat 1, the movement stroke of the first limiter 3 is smaller than that of the movable arm 2. As a result, the stopper 23 of the movable arm 2 and the first limiter 32 abut and form close contact, preventing water leakage.

[0091] When the rotation speed becomes smaller, the movable arm 2 moves toward the water inlet seat 1, because the second limit member 4 can also move toward the water inlet seat 1, but is constrained by the second elastic member 40. At the same rotation speed of the water inlet seat 1, the moving stroke of the second limit member 4 is smaller than the moving stroke of the movable arm 2, so that the blocking portion 23 of the movable arm 2 is against and in close contact with the second limit portion 42 to prevent water leakage.

[0092] A first embedding groove 320 is provided on the end surface of the first limiting portion 32 facing the blocking portion 23, and a first sealing ring 33 is provided in the first embedding groove 320; a second embedding groove 420 is provided on the end surface of the second limiting portion 42 facing the blocking portion 23, and a second sealing ring 43 is provided in the first embedding groove 420 to further prevent water leakage.

[0093] In this embodiment, there are two movable arms 2 and they are symmetrically arranged on the water inlet seat 1. Correspondingly, there are two first limit members 3 and two second limit members 4, so that the two movable arms 2 can move relative to the water inlet seat 1, further extending the overall length of the spray arm; of course, only one movable arm 2 can also be set.

[0094] The control method of the spray arm 6 of this embodiment includes the following steps:

[0095] (1) Setting the maximum amplitude value Y of the expected displacement of the water column sprayed by the nozzle group 22 on the tableware 7;

[0096] (2) Calculate the amplitude X2 of the nozzle group 22. The amplitude of the displacement of the water column generated by the nozzle group 22 on the tableware 7 is Y2;

[0097] (3) Under a certain water volume V, the motor speed is adjusted to change in the range [N1, N2] according to the sine law, and the amplitude X1 of the displacement of the movable arm 2 is measured. The displacement of the movable arm 2 causes the water column generated by the nozzle group 22 to produce an amplitude Y1 on the tableware 7, where Y is the sum of the maximum value of Y1 and the maximum value of Y2;

[0098] (4) Determine whether Y reaches the expected value. If so, end the process. If not, return to step (3) and change the motor speed range [N1, N2] until the set displacement Y is reached.

[0099] in

[0100] α1 is the angle between the water column generated by the spray hole group 22 and the horizontal plane; β1 is the angle between the surface where the open end of the tableware 7 is located and the horizontal plane.

[0101] "Amplitude" refers to the distance from the peak or trough to the horizontal axis in a sine curve, such as Figure 13 The d in.

[0102] Under the condition that the washing water volume V of the washing machine is constant, by changing the motor speed N, when the speed changes according to the sine law in the range [N1, N2] (in this embodiment, N1 = 2000, N2 = 2500), the movable arm can produce a sinusoidal oscillation displacement (amplitude X1) in its length direction, which corresponds to the trajectory of the water column on the tableware 7 being a sinusoidal oscillation displacement (amplitude Y1), as shown in FIG. Figure 12At the same time, the spray hole group 22 with a sinusoidal shape of amplitude X2 will generate an oscillating displacement of a sinusoidal shape (amplitude Y2) at a contact point on the tableware 7 due to the rotation of the spray arm 6, as shown in FIG. Figure 11 shown.

[0103] Example 3

[0104] like Figure 14 As shown, the difference between Example 3 and Example 2 is that the protrusion 5 is detachably connected to the upper wall of the spray arm 6. In this embodiment, the protrusion 5 is partially inserted into the movable arm 2, and the two are threadedly connected.

[0105] The control method of this embodiment differs from that of embodiment 2 in that:

[0106] In step (4), if Y does not reach the expected value, return to step (3) and change the motor speed range [N1, N2] and / or change the amplitude X2 of the spray hole group 22 of the spray arm 6 until the set displacement Y is reached. In this way, by adjusting Y1 or Y2, or both, a suitable Y value can be achieved to ensure the best cleaning effect of the spray arm 6.

[0107] During manufacturing, the amplitude X2 of the spray hole groups 22 on different protrusions 5 can be different. Since the protrusion 5 is detachably connected to the spray arm 6, the spray hole groups 22 with different amplitudes X2 can be replaced by replacing the protrusion 5.

[0108] In addition, in the above three embodiments, since the spray arm A is not easy to remove after being installed on the cleaning machine, the spray arm A can be installed after the displacement Y of the spray arm A reaches the set value through the above control method before assembly; of course, the spray arm A can also be directly installed in the cleaning machine and tested and adjusted according to the above control method.

[0109] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0110] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A control method for a spray arm of a cleaning machine, wherein the spray arm has a strip-shaped body, an inner cavity (10), a water inlet (12) and a plurality of spray holes (221) both of which are in fluid communication with the inner cavity (10); It is characterized by: The spray holes (221) are distributed in groups, each spray hole group (22) has a plurality of spray holes (221), the plurality of spray holes (221) in each spray hole group (22) are arranged in a sinusoidal shape, and the spray hole groups (22) are spaced apart along the length direction of the spray arm (6); The spray arm (6) comprises a water inlet seat (1) and a movable arm (2), wherein the movable arm (2) can move in a first direction toward the water inlet seat (1) or in a second direction away from the water inlet seat (1) under the action of water pressure; The spray arm (6) is connected to a motor drive; the control method comprises the following steps: (1) Setting the maximum amplitude value Y of the expected displacement of the water column sprayed by the nozzle group (22) on the tableware (7); (2) Calculate the amplitude X2 of the nozzle group (22). The amplitude of the displacement of the water column generated by the nozzle group (22) on the tableware (7) is Y2; (3) Under a certain water volume V, the motor speed is adjusted to change in the range [N1, N2] according to the sine law, and the amplitude X1 of the displacement of the moving arm (2) is measured. The displacement of the moving arm (2) causes the water column generated by the nozzle group (22) to produce an amplitude Y1 on the tableware (7), where Y is the sum of the maximum value of Y1 and the maximum value of Y2; (4) Determine whether Y reaches the expected value. If so, end the process. If not, return to step (3) and change the motor speed range [N1, N2] until the set displacement Y is reached. in ; Wherein α1 is the angle between the water column generated by the spray hole group (22) and the horizontal plane; β1 is the angle between the surface where the open end of the tableware (7) is located and the horizontal plane.

2. The control method according to claim 1, wherein: The multiple spray holes (221) of each spray hole group (22) are interconnected; or, the multiple spray holes (221) of each spray hole group (22) are spaced apart from each other.

3. The control method according to claim 1, wherein: The upper wall surface of the spray arm (6) is provided with convex portions (5) whose number is the same as the number of the spray hole groups (22), each of the convex portions (5) is in the shape of a hemispherical hollow interior, and each group of the spray hole groups (22) is correspondingly arranged on the spherical surface of a convex portion (5).

4. The control method according to claim 3, wherein: The convex portion (5) is detachably connected to the upper wall surface of the spray arm (6).

5. The control method according to any one of claims 1 to 4, characterized in that: The water inlet seat (1) is hollow inside to form a flow channel (11), and the water inlet seat (1) is provided with a water inlet (12) in fluid communication with the flow channel (11); The movable arm (2) is strip-shaped, one end of the movable arm (2) is connected to the water inlet seat (1), and the other end extends in a direction away from the water inlet seat (1). The interior of the movable arm (2) is hollow to form a channel (21) in fluid communication with the flow channel (11), and a spray hole (221) in fluid communication with the channel (21) is provided on the movable arm (2).

6. The control method according to claim 5, characterized in that: The movable arm (2) is provided with a stopper (23); The spray arm (6) also includes A first limiting member (3) is movably mounted on the water inlet seat (1), and the first limiting member (3) can move relative to the water inlet seat (1) along the length direction of the movable arm (2), and a first limiting portion (32) is provided on the first limiting member (3); A first elastic member (30) acts on the first limiting member (3) to ensure that the first limiting member (3) always maintains a tendency to move along the first direction; The second limiting member (4) is movably mounted on the water inlet seat (1), and the second limiting member (4) can move relative to the water inlet seat (1) along the length direction of the movable arm (2). The second limiting member (4) is provided with a second limiting portion (42). Along the direction of water flow, the second limiting portion (42) is located upstream of the first limiting portion (32). The blocking portion (23) can slide between the first limiting portion (32) and the second limiting portion (42) and abut against one of the first limiting portion (32) and the second limiting portion (42). The second elastic member (40) acts on the second limiting member (4), so that the second limiting member (4) always maintains a tendency to move along the second direction.

7. The control method according to claim 6, characterized in that: The first limiting member (3) is in the shape of a tube with both ends open. The first end of the first limiting member (3) can be inserted into the flow channel (11) of the water inlet seat (1) so as to be movable along its axial direction. The second end of the first limiting member (3) can be inserted into the channel (21) of the movable arm (2) so as to be movable along its axial direction. The first limiting portion (32) is arranged on the outer peripheral wall of the first limiting member (3) and is arranged adjacent to the second end of the first limiting member (3).

8. The control method according to claim 7, wherein: The water inlet seat (1) comprises a seat body (1a) and a guide tube (1b) with one end provided on the seat body (1a); the other end of the guide tube (1b) extends in a direction away from the seat body (1a); the seat body (1a) and the guide tube (1b) are both hollow inside and are connected to form the flow channel (11); the first limiting member (3) is inserted into the guide tube (1b) and can move axially along the guide tube (1b).

9. The control method according to claim 8, characterized in that: A first limiting structure for limiting the moving stroke of the first limiting member (3) is provided between the first limiting member (3) and the guide tube (1b), the first limiting structure comprising a first slide groove (13) and a first slider (31) movable in the first slide groove (13), the first slider (31) being elastically deformable, the first slide groove (13) being provided on one of the outer peripheral wall of the first limiting member (3) and the inner wall surface of the guide tube (1b), the first slider (31) being provided on the other of the outer peripheral wall of the first limiting member (3) and the inner wall surface of the guide tube (1b), the first slide groove (13) being closed at both ends and extending along the length direction of the movable arm (2).

10. The control method according to claim 8, characterized in that: The second limiting member (4) is also tubular, and the first end of the second limiting member (4) is movably sleeved on the guide tube (1b).

11. The control method according to claim 10, characterized in that: A second sliding groove (14) is provided on the outer wall surface of the guide tube (1b), and a second slider (41) capable of moving along the second sliding groove (14) is provided on the inner peripheral wall of the second limiting member (4). The second slider (41) is capable of elastic deformation, and both ends of the second sliding groove (14) are closed and extend along the length direction of the movable arm (2).

12. The control method according to claim 6, characterized in that: A first sealing ring (33) is provided on the end surface of the first limiting portion (32) facing the stop portion (23); and a second sealing ring (43) is provided on the end surface of the second limiting portion (42) facing the stop portion (23).

13. The control method according to claim 6, characterized in that: There are two movable arms (2) which are symmetrically arranged on the water inlet seat (1).

14. The control method according to claim 1, wherein: The upper wall surface of the spray arm (6) is provided with convex parts (5) whose number is the same as the number of the spray hole groups (22), each convex part (5) is in the shape of a hemispherical hollow interior, each group of the spray hole groups (22) is correspondingly arranged on the spherical surface of a convex part (5), and each convex part (5) is detachably connected to the upper wall surface of the spray arm (6); In step (4), if the expected value is not reached, return to step (3), change the motor speed range [N1, N2], and / or change the amplitude X2 of the nozzle group (22) of the spray arm (6) until the set displacement Y is reached.

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