CN212346456U - Spray arm and dish washing machine - Google Patents

Abstract

The utility model relates to a spray arm and dish washer, spray arm include the spray arm body, be equipped with in the spray arm body and spout the arm chamber, the spray arm body be equipped with the orifice that the spray arm chamber switched on, the orifice is two at least, be equipped with the ooff valve in spouting the arm chamber for control is in the orifice quantity of on-state. When the cleaning water sprayer is used, cleaning water firstly enters the spraying arm cavity, and water in the spraying arm cavity is sprayed into the inner cavity through the spray holes to clean stains on tableware in the inner cavity. The switch valve is arranged in the spray arm cavity of the spray arm, and the number of the spray holes in a conducting state is controlled through the switching process of the switch valve, so that the spray arm has different cleaning modes. And the switch valve is arranged in the spray arm cavity, so that the overall appearance structure of the spray arm is simple, and the market competitiveness is strong.

Description

Spray arm and dish washing machine

Technical Field

The utility model relates to a life electrical apparatus technical field especially relates to a spray arm and dish washer.

Background

The dish washer mainly comprises a spray arm, and the spray arm sprays water into the inner cavity to clean stains on the tableware. And when the tableware cleaning machine is used, the placing mode of the tableware in the inner cavity has certain randomness, and the quantity and the oil stain degree of the tableware are different, so that the dirt can be cleaned only by strong spraying force sometimes in the cleaning process, and the cleaning purpose can be achieved by slight cleaning sometimes. Therefore, the dishwasher needs to have different washing modes to meet different working condition requirements. In order to make the dishwasher have different washing modes, a flow dividing device is arranged outside the spray arm and guides water flow to different spray holes. And the spray arm also needs to be designed and assembled corresponding to the flow dividing device, so that the overall appearance structure of the dish washing machine is complex.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a spray arm and a dishwasher to simplify the structure.

The spray arm comprises a spray arm body, wherein a spray arm cavity is formed in the spray arm body, at least two spray holes are formed in the spray arm body and communicated with the spray arm cavity, and a switch valve is arranged in the spray arm cavity and used for controlling the number of the spray holes in a communicated state.

According to the spray arm, cleaning water firstly enters the spray arm cavity in the using process, and water in the spray arm cavity is sprayed into the inner cavity through the spray holes to clean stains on tableware in the inner cavity. The switch valve is arranged in the spray arm cavity of the spray arm, and the number of the spray holes in a conducting state is controlled through the switching process of the switch valve, so that the spray arm has different cleaning modes. When strong cleaning is needed, controlling more spray holes to be in a conducting state; when light cleaning is needed, the jet holes are controlled to be in a conducting state less frequently. And the switch valve is arranged in the spray arm cavity, so that the overall appearance structure of the spray arm is simple, and the market competitiveness is strong.

In one embodiment, the switching valve is a pressure-sensitive valve.

In one embodiment, the pressure-sensitive valve includes an elastic member and a sealing member, the sealing member is disposed corresponding to the nozzle hole, the elastic member is supported between the sealing member and a wall surface of the arm cavity, so that the sealing member can block the nozzle hole, and water pressure in the arm cavity can act on the sealing member to overcome elastic force of the elastic member, so that the sealing member operates relative to the nozzle hole to control conduction of the nozzle hole.

In one embodiment, the pressure sensing valve further comprises a mounting part, the mounting part is provided with a through hole, one end of the mounting part is connected with the wall surface of the spray arm cavity, so that the through hole is communicated with the spray hole, the other end of the through hole is communicated with the spray arm cavity, the elastic part and the sealing part are both arranged in the through hole, the elastic part is located between the spray hole and the sealing part, and the sealing part can move in the through hole along the axial direction and is used for controlling the on-off of the through hole.

In one embodiment, the mounting part is a mounting cover, the mounting cover is arranged at the spray hole of the spray arm body, the side wall of the mounting cover surrounds the through hole, the bottom wall of the mounting cover is provided with a through hole, the elastic part presses the sealing part against the bottom wall of the mounting cover, the sealing part can shield the through hole, and the outer diameter of the sealing part is smaller than the aperture of the through hole.

In one embodiment, a support ring is arranged on the wall surface of the spray arm cavity, the support ring surrounds the periphery of the spray hole, the mounting part is detachably connected with the support ring, the through hole is communicated with the support ring, and the elastic part and the sealing part are located in the support ring.

In one embodiment, the support ring is threadedly connected to the mount.

In one embodiment, the inner wall of the support ring is provided with a plurality of limiting ribs which are distributed at intervals along the circumferential direction of the support ring, the limiting ribs are arranged along the axial direction of the support ring, and the elastic part is positioned among the limiting ribs.

In one embodiment, the spray arm body is provided with a plurality of spray holes, the switch valve is used for controlling the on-off of at least one spray hole, and other spray holes which are not controlled by the switch valve are in a normally open state.

In one embodiment, the number of the on-off valves is plural, and one on-off valve corresponds to one nozzle hole.

In one embodiment, the spray arm body is provided with a plurality of spray holes, the pressure sensing valves are arranged in a plurality, one pressure sensing valve corresponds to one spray hole, the pressure sensing valves are divided into at least two groups, and the elastic force of the elastic part between each group is different.

In one embodiment, the spray holes are formed in the top wall of the spray arm body, the bottom wall of the spray arm body is provided with a water delivery hole, the top wall, the bottom wall and the side wall of the spray arm body enclose the spray arm cavity, the outer side surface of the bottom wall is provided with a buckle and a water delivery cylinder, the water delivery cylinder is correspondingly communicated with the water delivery hole, and the buckle is located outside the water delivery cylinder and used for being connected with the inner container in a buckled mode.

In one embodiment, the bottom wall of the spray arm body is detachably connected with the side wall of the spray arm body, and/or the top wall of the spray arm body is detachably connected with the side wall of the spray arm body.

A dishwasher comprises a dishwasher body and the spray arm, wherein the spray arm is positioned in an inner cavity of the dishwasher body.

The above scheme provides a dishwasher, which adopts the spray arm in any one of the above embodiments, so that the dishwasher has different washing modes. And the realization of different cleaning modes is realized by a switch valve arranged in the spray arm cavity, and the spray arm has a simple appearance structure. The spray arm and the assembly form between the dishwasher bodies can adopt the assembly form in the traditional dishwasher, the assembly difficulty of the dishwasher is not increased, and the market competitiveness is higher.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a cross-sectional view of a spray arm according to the present embodiment;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural view of the dishwasher according to the present embodiment.

Description of reference numerals:

10. a dishwasher; 11. a dishwasher body; 12. an inner cavity; 20. a spray arm; 21. a spray arm body; 211. a spray arm cavity; 212. spraying a hole; 213. a support ring; 214. limiting ribs; 215. a water delivery hole; 216. buckling; 217. a water delivery cartridge; 22. an on-off valve; 221. an elastic member; 222. a seal member; 223. a mounting member; 2231. and (6) perforating.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In one embodiment, as shown in fig. 1, a spray arm 20 is provided, the spray arm 20 being adapted for use in a domestic appliance such as a dishwasher 10 or an oven as shown in fig. 3 for spraying water into the chamber 12 to wash dishes in the chamber 12 or to clean the walls of the chamber 12.

Specifically, in one embodiment, as shown in fig. 1, the spray arm 20 includes a spray arm body 21, a spray arm cavity 211 is formed in the spray arm body 21, and the spray arm body 21 is provided with a spray hole 212 communicated with the spray arm cavity 211. When in use, cleaning water firstly enters the spray arm cavity 211, and water in the spray arm cavity 211 is sprayed in the inner cavity 12 through the spray holes 212 to clean stains on tableware in the inner cavity 12 or clean the wall surface of the inner cavity 12.

Further, the number of the spray holes 211 is at least two, and the spray arm cavity 211 is provided with a switch valve 22 for controlling the number of the spray holes 212 in a conducting state. Therefore, the spray arm 20 has different cleaning modes, and when strong cleaning is needed, the switch valve 22 is opened, so that more spray holes 212 are communicated, and the water consumption for cleaning is larger in the cleaning process; when light cleaning is needed, the switch valve 22 is closed, so that part of the spray holes 212 are blocked, and the water used for cleaning is small. And the switch valve 22 is arranged in the spray arm cavity 211, so that the overall appearance structure of the spray arm 20 is simple and has strong market competitiveness.

Further, the opening and closing of at least one nozzle hole 212 is controlled by the on-off valve 22, so that the spray arm 20 has different cleaning modes. Specifically, the on-off of each nozzle hole 212 may be controlled by the on-off valve 22, but the on-off valve 22 for controlling the on-off of different nozzle holes 212 may be opened and closed differently, so that the on-off valves 22 are opened and closed differently, and the spray arm 20 has different cleaning modes.

Further, in an embodiment, the spray arm body 21 is provided with a plurality of spray holes 212, the on-off valve 22 is used for controlling on/off of at least one spray hole 212, and other spray holes 212 which are not controlled by the on-off valve 22 are in a normally open state. Specifically, one switch valve 22 controls the on-off of one spray hole 212, or one switch valve 22 controls the on-off of two or more spray holes 212.

For example, the spray arm cavity 211 is divided into a plurality of cavities, each cavity is correspondingly provided with at least two spray holes 212, the switch valve 22 is used for controlling the on-off between the cavity and the water delivery hole 215 of the spray arm 20, and at this time, one switch valve 22 can simultaneously control the on-off of at least two spray holes 212. Here, the water supply hole 215 refers to a hole in the spray arm 20 for communicating with an external water pipe so that wash water can be introduced into the spray arm cavity 211.

For example, as shown in fig. 1, in one embodiment, one on-off valve 22 is provided at one of the nozzle holes 212, so that one on-off valve 22 controls on and off of one of the nozzle holes 212.

Further, as shown in fig. 1, there are a plurality of the on-off valves 22, and one on-off valve 22 corresponds to one nozzle hole 212.

Further specifically, the on-off state of the on-off valve 22 is switched by changing the magnitude of the water pressure in the spray arm chamber 211. For example, when the water pressure in the spray arm cavity 211 exceeds a preset value, the switch valve 22 is opened, and the spray hole 212 controlled by the switch valve 22 is conducted; when the water pressure in the spray arm chamber 211 is lower than the predetermined value, the on-off valve 22 is closed.

For example, in one embodiment, the on-off valve 22 is a pressure-sensitive valve. The pressure-sensitive valve can change state according to the water pressure in the spray arm cavity 211, so as to control the spray hole 212 to be switched on or switched off.

Alternatively, the switch valve 22 may also be another valve body structure capable of controlling the on-off of the nozzle hole 212, and is not limited in particular here.

Further, in one embodiment, as shown in fig. 1 and 2, the pressure sensing valve includes an elastic member 221 and a sealing member 222. The sealing member 222 is disposed corresponding to the nozzle hole 212, and the elastic member 221 is supported between the sealing member 222 and a wall surface of the nozzle arm cavity 211, so that the sealing member 222 can block the nozzle hole 212. The water pressure in the spray arm cavity 211 can act on the sealing element 222, and overcome the elastic force of the elastic element 221, so that the sealing element 222 operates relative to the spray hole 212 to control the conduction of the spray hole 212.

When the water pressure in the spray arm cavity 211 is lower than a predetermined value, the force of the water pressure acting on the sealing member 222 is not enough to overcome the elastic force of the elastic member 221, and the sealing member 222 moves under the elastic force of the elastic member 221 to block the spray hole 212. When the water pressure in the arm cavity 211 is higher than a predetermined value, the water pressure acts on the sealing member 222, and overcomes the elastic force of the elastic member 221, so that the sealing member 222 moves relative to the nozzle 212, and the nozzle 212 is conducted.

In the case that the spray arm 20 needs to provide pressure by using a driving member such as a water pump in the water spraying process, so that water can be sprayed out from the spray hole 212, the adjustment of the water pressure in the spray arm cavity 211 can be realized by adjusting the driving member, and the on-off state of the switch valve 22 can be adjusted by only controlling the driving force of the driving member.

More specifically, in one embodiment, as shown in fig. 1 and 2, the pressure sensing valve further includes a mounting member 223, the mounting member 223 is provided with a through hole, one end of the mounting member 223 is connected to a wall surface of the spray arm cavity 211, so that the through hole is communicated with the spray hole 212, and the other end of the through hole is communicated with the spray arm cavity 211. The elastic member 221 and the sealing member 222 are both disposed in the through hole, the elastic member 221 is located between the injection hole 212 and the sealing member 222, and the elastic member 221 can apply a force to the sealing member 222 in a direction away from the injection hole 212. The sealing member 222 is axially movable in the through hole for controlling the opening and closing of the through hole.

When the water pressure in the nozzle arm cavity 211 is smaller than a predetermined value, the elastic member 221 presses the sealing member 222 in a direction away from the nozzle hole 212, so that the elastic member 221 is matched with the first position of the mounting member 223 to block the through hole, and the nozzle hole 212 cannot pass water. When the water pressure in the spray arm cavity 211 is greater than a predetermined value, the force of the water pressure acting on the sealing member 222 is greater than the elastic force provided by the elastic member 221, the sealing member 222 moves towards the direction close to the spray orifice 212, the elastic member 221 is matched with the second position of the mounting member 223, so that the through hole is communicated, and the spray orifice 212 discharges water.

Specifically, the through-hole aperture of the first position of the mounting member 223 is smaller than the outer diameter of the sealing member 222, so that the through-hole is intercepted when the sealing member 222 is fitted to the first position; the aperture of the through hole in the second position of the mounting member 223 is larger than the outer diameter of the sealing member 222, such that the through hole is conductive when the sealing member 222 is fitted in the second position.

Specifically, in one embodiment, as shown in fig. 1 and 2, the mounting member 223 is a mounting cap provided at the nozzle hole 212 of the nozzle arm body 21, and a side wall of the mounting cap encloses the through hole. The bottom wall of the mounting cover is provided with a through hole 2231, the elastic member 221 presses the sealing member 222 against the bottom wall of the mounting cover, the sealing member 222 can shield the through hole 2231, and the outer diameter of the sealing member 222 is smaller than the aperture of the through hole.

So that when the water pressure is lower than a predetermined value, the sealing member 222 presses against the through hole 2231 to shield the through hole 2231, and the through hole is blocked. When the water pressure in the spray arm cavity 211 is greater than a predetermined value, the pressure applied to the side of the sealing member 222 facing the through hole 2231 is greater than the elastic force of the elastic member 221, so that the sealing member 222 moves in a direction away from the through hole 2231, a gap exists between the sealing member 222 and the wall of the through hole, the through hole is connected, and the spray hole 212 discharges water.

Further, as shown in fig. 1 and 2, in one embodiment, a wall surface of the spray arm cavity 211 is provided with a support ring 213, the support ring 213 surrounds an outer circumference of the spray hole 212, the mounting member 223 is detachably connected to the support ring 213, and the mounting member 223 is indirectly connected to the wall surface of the spray arm cavity 211 through the support ring 213. The through hole is in communication with the support ring 213, and the elastic member 221 and the sealing member 222 are located in the support ring 213.

During assembly, the elastic member 221 and the sealing member 222 are placed in the support ring 213, and then the mounting member 223 is coupled to the support ring 213. Specifically, in one embodiment, as shown in FIG. 2, the support ring 213 is threadably coupled to the mount 223. The outer circumference of the support ring 213 is provided with an external thread, and the inner circumference of the sidewall of the mounting member 223 is provided with an internal thread, which is matched with the internal thread.

Alternatively, the mounting member 223 may be directly connected to the wall of the spray arm cavity 211, for example, by bonding.

Further, in an embodiment, as shown in fig. 2, the inner wall of the supporting ring 213 is provided with a plurality of limiting ribs 214, the limiting ribs 214 are distributed at intervals along the circumferential direction of the supporting ring 213, the limiting ribs 214 are arranged along the axial direction of the supporting ring 213, and the elastic element 221 is located between the limiting ribs 214. The plurality of limiting ribs 214 provide a guiding function for the elastic member 221, so that the elastic member 221 can move in the axial direction of the support ring 213 to be compressed, and meanwhile, the sealing member 222 can move in the through hole smoothly in the axial direction, thereby ensuring the sensitivity and accuracy of the adjustment process.

Further, when the spray arm body 21 is provided with a plurality of the spray holes 212, the number of the pressure sensing valves is plural, and one pressure sensing valve corresponds to one spray hole 212. In one embodiment, the pressure-sensitive valves are divided into at least two groups, and the elastic force of the elastic member 221 between the groups is different. In other words, the water pressure required for switching the open and closed states of the pressure-sensitive valves of different groups is different, so as to further expand the cleaning conditions that the spray arm 20 can adapt to. The greater the elastic force of the elastic member 221, the greater the water pressure required for the set of pressure-sensitive valves to switch the open and closed states.

Further, in one embodiment, as shown in fig. 1, the spray holes 212 are formed on the top wall of the spray arm body 21, and the bottom wall of the spray arm body 21 is provided with water supply holes 215 for introducing water required for cleaning into the spray arm cavity 211. The top wall, the bottom wall and the side wall of the spray arm body 21 enclose the spray arm cavity 211. The outer side surface of the bottom wall is provided with a buckle 216 and a water delivery cylinder 217, the water delivery cylinder 217 is correspondingly communicated with the water delivery hole 215, and the buckle 216 is positioned outside the water delivery cylinder 217 and is used for being connected with the inner container in a buckling mode.

When the spray arm 20 is assembled on the inner container, the water delivery cylinder 217 and the buckle 216 are assembled with the inner container, and the spray arm 20 can rotate in the inner container under the action of the buckle 216 without falling off.

Further, in one embodiment, the bottom wall of the spray arm body 21 is detachably connected to the side wall of the spray arm body 21, and/or the top wall of the spray arm body 21 is detachably connected to the side wall of the spray arm body 21.

In the assembling process, the on-off valve 22 is assembled in the spray arm cavity 211, and then the bottom wall, the side wall and the top wall of the spray arm body 21 are assembled together.

Further, as shown in FIG. 3, in another embodiment, a dishwasher 10 is provided, comprising a dishwasher body 11 and the spray arm 20 described above, the spray arm 20 being located in the inner cavity 12 of the dishwasher body 11.

The dishwasher 10 provided by the above scheme adopts the spray arm 20 in any one of the above embodiments, so that the dishwasher 10 has different washing modes. And the realization of different cleaning modes is realized by the switch valve 22 arranged in the spray arm cavity 211, and the spray arm 20 has simple appearance structure. The assembly form between the spray arm 20 and the dishwasher body 11 can be the assembly form in the conventional dishwasher 10, which does not increase the assembly difficulty of the dishwasher 10 and has a large market competitiveness.

A dishwasher control method for controlling the dishwasher 10 of any of the above embodiments, the dishwasher control method comprising the steps of:

the pump water pressure of the water pump in the dishwasher 10 is adjusted so that the switching state of the switching valve 22 is changed.

The on-off state of the switch valve 22 is switched by adjusting the pump water pressure of the water pump in the dishwasher 10, so that the dishwasher 10 has different cleaning modes and meets different working condition requirements. And the cleaning mode is adjusted by directly utilizing the change of the water pressure of the water pump, and the control process is simple. The dishwasher does not need to add excessive regulating devices, and compared with the common dishwasher, the dishwasher does not need to change the appearance structure of the dishwasher.

Further, in one embodiment, the dishwasher control method further includes the steps of:

acquiring a cleaning mode of the dishwasher 10, and if the dishwasher 10 is in a powerful cleaning state, adjusting the water pumping pressure of the water pump to a larger value so that more spray holes 212 are in a conducting state;

if the dishwasher 10 is in a light washing state, the pumping pressure of the water pump is adjusted to a small value, so that the small number of spray holes 212 are in a conduction state.

When the pumping pressure of the water pump is adjusted to a large value, the water pressure in the spray arm cavity 211 is large, the switch valve 22 is opened, and more spray holes 212 are in a conducting state. When the pressure of the water pump is adjusted to a small value, the water pressure in the spray arm cavity 211 is small, the switch valve 22 is closed, and fewer spray holes 212 are in a conducting state.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (14)

1. The spray arm is characterized by comprising a spray arm body, wherein a spray arm cavity is formed in the spray arm body, at least two spray holes are formed in the spray arm body and communicated with the spray arm cavity, and a switch valve is arranged in the spray arm cavity and used for controlling the number of the spray holes in a communicated state.

2. The spray arm of claim 1 wherein said on-off valve is a pressure sensitive valve.

3. The spray arm of claim 2, wherein the pressure-sensitive valve includes a resilient member and a sealing member, the sealing member is disposed corresponding to the spray hole, the resilient member is supported between the sealing member and a wall surface of the spray arm cavity, so that the sealing member can block the spray hole, and water pressure in the spray arm cavity can act on the sealing member to overcome a resilient force of the resilient member, so that the sealing member operates relative to the spray hole to control the conduction of the spray hole.

4. The spray arm of claim 3, wherein the pressure-sensitive valve further comprises a mounting member, the mounting member is provided with a through hole, one end of the mounting member is connected to a wall surface of the spray arm cavity, so that the through hole is communicated with the spray hole, the other end of the through hole is communicated with the spray arm cavity, the elastic member and the sealing member are both arranged in the through hole, the elastic member is located between the spray hole and the sealing member, and the sealing member is axially movable in the through hole for controlling the through hole to be opened or closed.

5. The spray arm of claim 4, wherein the mounting member is a mounting cover, the mounting cover is disposed at the spray hole of the spray arm body, the side wall of the mounting cover surrounds the through hole, the bottom wall of the mounting cover is provided with a through hole, the elastic member presses the sealing member against the bottom wall of the mounting cover, the sealing member can shield the through hole, and the outer diameter of the sealing member is smaller than the aperture of the through hole.

6. The spray arm of claim 4, wherein the wall of the spray arm cavity is provided with a support ring, the support ring surrounds the periphery of the spray hole, the mounting member is detachably connected with the support ring, the through hole is communicated with the support ring, and the elastic member and the sealing member are located in the support ring.

7. The spray arm of claim 6 wherein said support ring is threadably connected to said mount.

8. The spray arm of claim 6, wherein the inner wall of the support ring is provided with a plurality of limiting ribs, the limiting ribs are distributed at intervals along the circumferential direction of the support ring, the limiting ribs are arranged along the axial direction of the support ring, and the elastic member is located between the limiting ribs.

9. The spray arm according to any one of claims 1 to 8, wherein the spray arm body is provided with a plurality of spray holes, the switch valve is used for controlling on-off of at least one spray hole, and other spray holes which are not controlled to be on-off by the switch valve are in a normally open state.

10. The spray arm of claim 9, wherein the number of the on-off valves is plural, and one on-off valve corresponds to one spray hole.

11. The spray arm according to any one of claims 3 to 8, wherein the spray arm body is provided with a plurality of the spray holes, the pressure-sensitive valves are provided in plurality, one pressure-sensitive valve corresponds to one spray hole, the pressure-sensitive valves are divided into at least two groups, and the elastic force of the elastic member between each group is different.

12. The spray arm according to any one of claims 1 to 8, wherein the spray hole is formed in a top wall of the spray arm body, a water delivery hole is formed in a bottom wall of the spray arm body, the spray arm cavity is defined by the top wall, the bottom wall and a side wall of the spray arm body, a buckle and a water delivery cylinder are arranged on an outer side surface of the bottom wall, the water delivery cylinder is communicated with the water delivery hole correspondingly, and the buckle is located outside the water delivery cylinder and used for being connected with an inner container in a buckled mode.

13. The spray arm of claim 12, wherein the bottom wall of the spray arm body is removably attached to the side wall of the spray arm body and/or the top wall of the spray arm body is removably attached to the side wall of the spray arm body.

14. A dishwasher comprising a dishwasher body and a spray arm according to any of claims 1 to 13, the spray arm being located in an internal chamber of the dishwasher body.

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