CN211911544U

CN211911544U - Dish washer, cleaning system, signal detection device

Info

Publication number: CN211911544U
Application number: CN201922145211.5U
Authority: CN
Inventors: 宋慨; 赵成刚; 杨国斌
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-11-13
Anticipated expiration: 2029-12-04

Abstract

The utility model discloses a dish washer, cleaning system, signal detection device, this cleaning system includes: signal detection device and be used for spraying the spray arm of treating the washing region, signal detection device includes: a sensing member and a detecting member for sensing the sensing member, wherein the sensing member and the detecting member move relatively, and the sensing member at least comprises: the detection piece is used for detecting a first sensing signal corresponding to the first sensing part and a second sensing part, and the first sensing signal and the second sensing signal corresponding to the second sensing part are different; and the controller is electrically connected with the detection piece. The utility model provides a dish washer, cleaning system, signal detection device can realize that the subregion washs, shortens the washing time greatly, reduces energy consumption and water consumption, improves the user and uses experience.

Description

Dish washer, cleaning system, signal detection device

Technical Field

The utility model relates to a tableware cleaning equipment technical field, in particular to dish washer, cleaning system, signal detection device.

Background

A dishwasher is an apparatus for automatically washing dishes. The dish washing machine is used for washing tableware, so that the tedious manual labor can be greatly reduced, the operation is simple and convenient, and the automation degree is high, so that the dish washing machine is popular with more and more consumers.

Generally, a dishwasher is provided with a spray arm on which spray nozzles are provided. The water flow from the spray arm nozzles can flow to the inner space of the dishwasher for washing the dishes in the dishwasher.

The applicant found that: the water flow of the spray arm is currently generally such that the entire interior of the dishwasher is completely sprayed. The above-mentioned scene is suitable for when the inside space of whole dish washer has all placed the tableware, namely full load tableware. However, when the dishwasher has dishes to be washed only in a local space, if the above-described mode is used for washing, there is a great waste of washing time, energy consumption, water consumption, etc.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned defect among the prior art, the utility model aims at providing a dish washer, cleaning system, signal detection device can realize the subregion and wash, shortens the washing time greatly, reduces energy consumption and water consumption, improves the user and uses experience.

The above object of the present invention can be achieved by the following technical solutions:

a signal detection device, comprising: a sensing member and a detecting member for sensing the sensing member, wherein the sensing member and the detecting member move relatively, and the sensing member at least comprises: the detection piece is used for detecting a first sensing signal corresponding to the first sensing part and a second sensing part, and the first sensing signal and the second sensing signal corresponding to the second sensing part are different; and the controller is electrically connected with the detection piece.

Further, the first sensing portion and the second sensing portion have a difference in at least one of a width of the sensing portion, a distance from the sensing portion to the detecting member, and a material of the sensing portion.

Further, the sensing part has a body, the first sensing parts and the second sensing parts are uniformly distributed along the circumferential direction of the body, and when the number of the second sensing parts is at least two, the second sensing parts are completely the same in sensing part width, distance from the sensing part to the detecting part, sensing part material or have a difference in at least one aspect.

A cleaning system comprises the signal detection device and a spray arm, wherein the spray arm is used for spraying an area to be cleaned.

Further, the number of the second sensing parts is one, when the detecting part senses the first sensing signal, the spray arm is located at an initial position, and when the detecting part senses the second sensing signal, the spray arm changes a movement direction or a movement rate.

Further, the number of the second sensing parts is at least two, the controller further comprises a counter for counting signals sensed by the detecting member, when the detecting member senses the first sensing signal, the spray arm is located at an initial position, and when the counter counts and accumulates to a predetermined value, the spray arm changes a movement direction or a movement rate.

Further, the area to be cleaned at least comprises a first area and a second area, and the spray arm reciprocates at least in the first area and/or the second area; or the spray arm passes through the first zone at a first rate and the second zone at a second rate, the first rate being different from the second rate.

Further, the cleaning system further comprises: and the spraying arm and the sensing piece move under the action of the controller and the driving device.

Further, the reciprocating times of the spray arm in the first area are different from the reciprocating times of the spray arm in the second area.

Further, the time or rate of movement of the spray arm reciprocating in the first zone is different from the time or rate of movement of the spray arm reciprocating in the second zone.

Further, drive arrangement is provided with the drive shaft, the arm that sprays is provided with the axis of rotation, the body of sensing spare with the drive shaft or with the axis of rotation is connected, first sensing portion and second sensing portion protrusion set up the body outer wall, the number of first sensing portion is 1, the number of second sensing portion is 1 at least.

Further, the detection device comprises any one of the following: photoelectric groove type sensor, hall sensor, reflection type sensor.

Furthermore, the driving shaft is in transmission connection with a rotating shaft of the spraying arm through a gear transmission mechanism, and the sensing part is arranged on the driving shaft or the rotating shaft.

Furthermore, detection device is photoelectric groove formula sensor, the drive shaft or the periphery of axis of rotation is provided with the installation shell, it fixes to detect the piece on the installation shell, be provided with photoelectric groove on detecting the piece, sensing piece follows the drive shaft or when the axis of rotation motion, first sensing portion and second sensing portion pass through in proper order photoelectric groove.

A dishwasher comprises the washing system and a tableware placing frame positioned above the spraying arm, wherein the tableware placing frame is internally provided with the area to be washed.

As can be seen from the above technical solutions provided by the embodiments of the present application, the dishwasher, the washing system, and the signal detection device provided by the present application, wherein the detection device is provided with a sensing element and a detection element which move relatively, and because the sensing element is provided with a first sensing portion and a second sensing portion, a first sensing signal corresponding to the first sensing portion sensed by the detection element is different from a second sensing signal corresponding to the second sensing portion sensed by the detection element. When the controller receives different sensing signals sensed by the detection piece, the initial position of the detected piece (such as a spray arm) can be determined firstly according to the different sensing signals, then the real-time position of the detected piece (such as the spray arm) is determined, and the subarea cleaning of the area to be cleaned is realized by changing any one of the movement direction of the spray arm and the movement speed of the spray arm, so that the washing time can be greatly shortened, the energy consumption and the water consumption are reduced, and the user experience is improved.

Drawings

Fig. 1 is a schematic structural diagram of a signal detection device provided in an embodiment of the present application;

FIG. 2 is a schematic view of a sensor element of the signal detection device provided in FIG. 1;

FIG. 3 is a schematic view showing a structure of a detecting member in the signal detecting device provided in FIG. 1;

FIG. 4 is a schematic illustration of a spray arm cleaning in a first zone in a cleaning system provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a position of a spray arm at an interface between a first region and a second region in a cleaning system provided in an embodiment of the present application.

Description of reference numerals:

1. a sensing element; 11. a first sensing section; 12. a second sensing section;

2. a detection member; 20. a photovoltaic cell;

3. a spray arm; 30. a nozzle;

4. an area to be cleaned; 41. a first region; 42. a second region; A. an initial position; B. switching positions;

5. and (5) mounting the shell.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention, and after reading the present invention, the modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the claims attached to the present application.

It will be understood that when an element is referred to as being "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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a dish washer, cleaning system, signal detection device can realize that the subregion washs, shortens the washing time greatly, reduces energy consumption and water consumption, improves the user and uses experience.

Referring to fig. 1 to fig. 5, a signal detecting apparatus according to an embodiment of the present disclosure may include: the sensing device comprises a sensing piece 1, a detection piece 2 for sensing the sensing piece 1, and a controller electrically connected with the detection piece 2. The sensing element 1 and the detecting element 2 move relatively. The sensor piece 1 comprises at least: a first sensing part 11 and a second sensing part 12. The first sensing signal corresponding to the first sensing portion 11 sensed by the detecting member 2 is different from the second sensing signal corresponding to the second sensing portion 12 sensed by the detecting member.

In the present specification, the scenario in which the signal detection device is applied to the washing system of the dishwasher is mainly exemplified, and the embodiment of the signal detection device applied in other scenarios may be adaptively replaced by referring to the detailed description of the embodiment, and the present application is not repeated here.

In this embodiment, the signal detection device may be provided with a sensing member 1 and a detection member 2 that are relatively movable. Wherein the sensor element 1 can be arranged on a moving part, for example following a rotating part in a dishwasher. Specifically, the sensor member 1 may be fixed to the spray arm 3 or a transmission mechanism having a synchronous motion relationship with the spray arm 3, or a predetermined rotation ratio, such as a drive shaft for driving the spray arm 3 to rotate. The detector 2 may be fixed to a non-moving part, such as a housing. When the spray arm 3 rotates, the sensor part 1 rotates relative to the detecting part 2. Since the sensing element 1 is provided with the first sensing portion 11 and the second sensing portion 12, a first sensing signal corresponding to the first sensing portion 11 sensed by the detecting element 2 is different from a second sensing signal corresponding to the second sensing portion 12 sensed by the detecting element.

When the controller receives different sensing signals sensed by the detection piece 2, the initial position A of the detected piece (such as the spray arm 3) can be determined according to the different sensing signals, the real-time position of the detected piece (such as the spray arm 3) is further determined, and different cleaning areas can be cleaned in a partitioning mode by changing any one of the movement direction of the spray arm 3 and the movement speed of the spray arm 3, so that the washing time can be greatly shortened, the energy consumption and the water consumption are reduced, and the use experience of a user is improved.

In case the signal detection device is applied in a dishwasher washing system, when the controller receives the first sensing signal, it may indicate that the spray arm 3 is located at the initial position a. When the controller receives the second sensing signal, it may indicate that the spray arm 3 is in the switching position B in one case, i.e., that the rotation direction or speed of the spray arm 3 needs to be changed.

As shown in fig. 4 and 5, for example, when the spray arm 3 is rotated from the initial position a and then moved to the switching position B, the spray nozzles 30 on the spray arm 3 are cleaned to cover the first cleaning region. When the spray arm 3 moves to the switching position B, the controller receives the second sensing signal, at this time, the rotation direction of the spray arm 3 is changed, the spray arm 3 moves reversely from the switching position B to the initial position a, in the moving process, the spray nozzle 30 on the spray arm 3 still cleans and covers the first cleaning area, and finally returns to the initial position a again, and the controller receives the first sensing signal. The spray nozzles 30 of the spray arm 3 are constantly moved back and forth in the first cleaning zone, so that the first cleaning zone is cleaned in a targeted manner.

Taking the change rate as an example, when the spray arm 3 rotates from the initial position a and moves to the switching position B, the spray arm 3 moves at a first rotation speed, and the spray nozzles 30 on the spray arm 3 clean and cover a first cleaning area. When the spray arm 3 moves to the switching position B, the controller receives the second sensing signal, at this time, the rotation rate of the spray arm 3 is changed, the spray arm 3 moves at the second rotation speed, the spray nozzle 30 on the spray arm 3 cleans and covers the second cleaning area, and finally returns to the initial position a again, and the controller receives the first sensing signal. The rotational speed of the shower arm 3 is repeatedly switched in the above manner, and thus, the washing is performed for different washing areas at different washing times.

In the present embodiment, the first sensor portion 11 and the second sensor portion 12 are different in at least one of sensor portion width, sensor portion-to-detector 2 distance, and sensor portion material.

Specifically, the first sensor unit 11 and the second sensor unit 12 may be configured to be different in structure and adapted according to the detection principle. For example, when the first sensor portion 11 and the second sensor portion 12 are different in width, the time length of the sensing signal detected by the detecting member 2 is different. The sensing part with wider width has longer corresponding sensing signal duration.

For example, when the distances from the first sensor portion 11 and the second sensor portion 12 to the detecting member 2 are different, parameters such as the intensity of the sensing signal detected by the detecting member 2 are different. The sensing part with the closer distance has stronger corresponding sensing signal intensity.

For example, for a signal detection device that achieves detection based on the principle of magnetic sensing, the magnetism of the first and second sensing portions 12 may be different. Under the same other conditions, the sensor section having a strong magnetism has a strong corresponding sensing signal strength.

In the present embodiment, the first sensor unit 11 may be one for determining the initial position a of the object to be detected (for example, the shower arm 3). The number of the second sensing parts 12 may be one or more, and is used for determining the current movement position of the detected piece.

In one embodiment, for example, for a scenario in which the sensing element 1 rotates along the rotation axis of the spray arm 3, the sensing element 1 may be provided with an overall annular body, and the first sensing part 11 and the second sensing part 12 are distributed along the circumferential direction of the body. The plurality of sensing portions formed by the first sensing portion 11 and the second sensing portion 12 may be uniformly distributed along the circumferential direction, and may also be non-uniformly distributed, and the distribution position may be set according to the position of the area 4 to be cleaned, and the present application is not limited specifically herein.

In one embodiment, the number of the first sensing parts 11 may be one, and the number of the second sensing parts 12 may be one. The first sensor unit 11 is adapted to match an initial position a of the shower arm 3, and the second sensor unit 12 is adapted to match a switching position B of the shower arm 3. The first and

second sensing portions

11 and 12 may be distributed with a 180 deg. center angle.

When the number of the second sensing parts 12 is at least two, the first sensing part 11 and the plurality of second sensing parts 12 may be uniformly distributed along the circumferential direction of the body. For example, the number of the first sensor portions 11 may be one, the number of the second sensor portions 12 may be 5, and two adjacent sensor portions may be distributed with a center angle of 60 °.

In the present embodiment, the plurality of second sensor portions 12 are completely the same in sensor portion width, sensor portion-to-detector 2 distance, and sensor portion material. When the plurality of second sensor portions 12 are all the same, each of the sensing signals of the second sensor portions 12 detected by the detecting member 2 is the same. At this time, the controller may be provided with a counter, which may count the received sensing signal, so that the current position of the detected member (e.g., the spray arm 3) may be determined according to the second sensing signal.

Further, the plurality of second sensor portions 12 differ in at least one of sensor portion width, sensor portion-to-detector 2 distance, and sensor portion material. When there is a difference between the plurality of second sensor portions 12, there is a difference between the second sensing signals of the second sensor portions 12 detected by the detecting member 2. At this time, the controller may determine the position of the currently detected member (e.g., spray arm 3) based on the received different sensing signals.

Based on the signal detection device provided in the foregoing embodiment, an embodiment of the present application further provides a cleaning system, which may include: the signal detection device described in the above embodiment, and the shower arm 3. The spray arm 3 is used for spraying the area 4 to be cleaned.

The area to be cleaned 4 comprises at least: a first region 41 and a second region 42. The first region 41 and the second region 42 may contain different dishes. The dishes in the first zone 41 and the second zone 42 may differ in number, placement density, or difficulty in cleaning. In general, the dishes in first zone 41 and second zone 42 will require different cleaning requirements. In one embodiment, among others, there may be no cutlery in one area. The first region 41 and the second region 42 have a boundary position. Wherein the initial position a of the spray arm 3 may coincide with the interface position.

In this embodiment, the signal detection device may refer to the detailed description of the above embodiments. Wherein the signal detection device may include a first sensing part 11 and at least one second sensing part 12.

In one embodiment, the number of the second sensing parts 12 is one, the spray arm 3 is located at the initial position a when the first sensing signal is sensed by the detecting member 2, and the spray arm 3 changes the moving direction or the moving speed when the second sensing signal is sensed by the detecting member 2.

In the present embodiment, when the detecting element 2 detects the second sensing signal, the second sensing unit 12 indicates that the spray arm 3 is located at the switching position B, and the spray arm 3 can change the moving direction, and the spray arm 3 can reciprocate in a fixed area (for example, the first area 41), so that the dishes in the area can be specifically washed. At this point, no dishes in second area 42 typically need to be washed.

When a small amount of tableware or lightly soiled tableware exists in the second area 42, and the detecting part 2 senses the second sensing signal, the spraying arm 3 is located at the switching position B, the rotating speed of the spraying arm 3 can be increased at this time, and the cleaning time in the second area 42 is shortened, so that the cleaning time can be reasonably distributed according to different cleaning requirements, and the partitioned cleaning is realized to the greatest extent reasonably.

In another embodiment, the number of the second sensing parts 12 is at least two, and the controller may further include a counter for counting signals sensed by the detecting member 2, the spray arm 3 being located at the initial position a when the detecting member 2 senses the first sensing signal, and the spray arm 3 changing a moving direction or a moving rate when the counter counts up to a predetermined value.

Specifically, the shower arm 3 may reciprocate in at least one of the first region 41 and the second region 42. Alternatively, the spray arm 3 passes through the first zone 41 at a first rate and the second zone 42 at a second rate, the first rate being different from the second rate.

In the present embodiment, the number of the second sensor units 12 may be plural. Specifically, the number of the cells may be 3 to 8. The plurality of second sensing parts 12 and the first sensing parts 11 may be uniformly distributed along the circumferential direction. Wherein the controller may determine the initial position a of the spray arm 3 from the first sensing signal. Furthermore, the controller may be provided with a counter. The counter is used for counting the signals sensed by the detecting member 2. In particular, the counter may count the second sensing signal. When the counter counts up to a predetermined value, it indicates that the spray arm 3 is in the switching position B, and at this time, the spray arm 3 can change the moving direction or moving speed to realize the zone cleaning.

Wherein the predetermined value matches the number of the second sensing parts 12. For example, when the counter counts only the number of the second sensing signals, the predetermined value is equal to the number of the second sensing parts 12. When the counter counts the number of the first sensing signal and the second sensing signal, the predetermined value is the sum of the number of the first sensing part 11 and the second sensing part 12.

In this embodiment, the cleaning system may further include: and the driving device is electrically connected with the controller. The spray arm 3 and the sensor element 1 are moved by the control and the drive. Wherein, the driving device mainly provides driving force for the spray arm 3 and the sensing piece 1. In particular, the drive means may comprise a motor and a transmission. The controller can be electrically connected to the motor to control the rotation direction and speed of the motor, so as to adjust the motion state of the spray arm 3 and the sensor 1.

The driving device is provided with a driving shaft, the spraying arm 3 is provided with a rotating shaft, and the body of the sensing part 1 is connected with the driving shaft or the rotating shaft. The first sensing part 11 and the second sensing part 12 are arranged on the outer wall of the body in a protruding mode.

Wherein, the drive shaft and the rotating shaft of the spray arm 3 can be in transmission connection through a gear transmission mechanism. The sensor element 1 is arranged on the drive shaft or on the rotary shaft. The sensor element 1 can be rotated synchronously with the spray arm 3 or at a predetermined rotational speed.

In this embodiment, the detection means may include any one of the following: a photocell 20 sensor, a hall sensor, a reflective sensor.

When the detection device is a hall sensor, the detection can be realized by utilizing the principle of magnetic induction. Specifically, when the sensing element 1 is aligned with the detecting element 2, a sensing signal is generated. For example, the first sensing portion 11 generates a first sensing signal when facing the detecting member 2; the second sensing portion 12 generates a second sensing signal when it is opposite to the detecting member 2. When at least one of magnetism, width, distance from the detecting member 2, and the like of the first sensing part 11 and the second sensing part 12 is different, the sensing signals generated correspondingly are different.

When the detection device is a reflection type sensor, it can realize detection by using the principle of infrared reflection. Specifically, when the infrared ray emitted from the detecting element 2 is reflected by the sensing element 1 and then received by the detecting element 2, a sensing signal is generated. When at least one of the width, the distance from the detection element 2, the shape and the configuration of the reflection surface, and the like of the first sensor portion 11 and the second sensor portion 12 is different, the sensing signals generated correspondingly are different.

As shown in fig. 1 to 3, the detection means may be a photocell 20 type sensor. A mounting case 5 is provided at the periphery of the driving shaft or the rotating shaft. The detection member 2 is fixed to the mounting case 5. The detection member 2 is provided with a photoelectric groove 20. When the sensing element 1 moves along with the driving shaft or the rotating shaft, the first sensing part 11 and the second sensing part 12 sequentially pass through the photoelectric groove 20, and sequentially generate a first sensing signal and a second sensing signal.

In one embodiment, the number of reciprocations of the spray arm 3 in the first region 41 is different from the number of reciprocations of the spray arm 3 in the second region 42.

In the present embodiment, the spray arm 3 may reciprocate in the first region 41 and may also reciprocate in the second region 42, wherein the number of times the spray arm 3 reciprocates in the first region 41 is different from the number of times the spray arm 3 reciprocates in the second region 42, because the demand for washing dishes in the first region 41 and the second region 42 are different.

For example, the first region 41 has a greater difficulty in dish washing than the second region 42, and the controller may realize that the number of times the spray arm 3 reciprocates in the first region 41 is greater than the number of times the spray arm reciprocates in the second region 42 according to the received first and second sensing signals and the count information in the counter.

In the dishwasher, a zone washing mode may be provided, corresponding to the dishwasher, and when the mode is set, the first area 41 may be a heavy zone to be washed, and the second area 42 may be a light zone to be washed.

In another embodiment, when the dish washing requirements of the first zone 41 are different from the dish washing requirements of the second zone 42, the time or rate of movement of the spray arm 3 reciprocating in the first zone 41 is different from the time or rate of movement of the spray arm 3 reciprocating in the second zone 42.

In order to achieve different degrees of cleaning of the dishes in the first zone 41 and the second zone 42, this can be achieved by controlling the rate of movement or the time of movement of the spray arm 3 in the first zone 41 and the second zone 42. For example, when the dish washing difficulty of the first region 41 is greater than that of the second region 42, the time for the spray arm 3 to wash the first region 41 can be controlled to be longer than that of the second region 42; alternatively, the movement rate of the shower arm 3 in the first region 41 is controlled to be lower than the movement rate of the second region 42.

Based on the washing system provided in the above embodiments, the present application also provides a dishwasher using the washing system. The dishwasher is provided with a dish rack above the spray arm 3, in addition to the above-mentioned washing system, in which the area 4 to be washed is formed.

The dishwasher can realize the partition washing function which can be realized by the washing system. It should be noted that the partition cleaning function provided in the embodiment of the present application can meet the requirement of cleaning tableware in different cleaning areas, including whether the tableware is cleaned in partitions based on different areas, and also can be cleaned in partitions based on different cleaning degrees required by the tableware in different areas, so as to greatly shorten the washing time, reduce the energy consumption and water consumption, and improve the user experience.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are disclosed as above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A signal detection device, comprising:

a sensing member and a detecting member for sensing the sensing member, wherein the sensing member and the detecting member move relatively, and the sensing member at least comprises: the detection piece is used for detecting a first sensing signal corresponding to the first sensing part and a second sensing part, and the first sensing signal and the second sensing signal corresponding to the second sensing part are different;

and the controller is electrically connected with the detection piece.

2. The signal detection device according to claim 1, wherein the first sensor portion and the second sensor portion differ in at least one of a sensor portion width, a sensor portion-to-detector distance, and a sensor portion material.

3. The signal detection device according to claim 2, wherein the sensor member has a body, the first sensor portions and the second sensor portions are uniformly distributed along a circumferential direction of the body, and when the number of the second sensor portions is at least two, the plurality of second sensor portions are identical in at least one of a sensor portion width, a sensor portion-to-sensor member distance, a sensor portion material, or are different.

4. A cleaning system, comprising: the signal detection device according to any one of claims 1 to 3,

the spraying arm is used for spraying the area to be cleaned.

5. The cleaning system of claim 4, wherein the number of the second sensing portions is one, the spray arm is located at an initial position when the first sensing signal is sensed by the detecting member, and the spray arm changes a moving direction or a moving rate when the second sensing signal is sensed by the detecting member.

6. The washing system as claimed in claim 4, wherein the number of the second sensing portions is at least two, and the controller further comprises a counter for counting signals sensed by the sensing member, the spray arm being located at an initial position when the sensing member senses the first sensing signal, and the spray arm changing a moving direction or a moving rate when the counter counts up to a predetermined value.

7. The cleaning system according to claim 5 or 6, wherein the area to be cleaned comprises at least a first area and a second area, the spray arm being reciprocated at least in the first area and/or the second area; or the spray arm passes through the first zone at a first rate and the second zone at a second rate, the first rate being different from the second rate.

8. The cleaning system of claim 7, further comprising: and the spraying arm and the sensing piece move under the action of the controller and the driving device.

9. The cleaning system of claim 8, wherein the number of reciprocations of the spray arm in the first region is different from the number of reciprocations of the spray arm in the second region.

10. The cleaning system of claim 8, wherein a time or rate of movement of the spray arm to reciprocate in the first zone is different than a time or rate of movement of the spray arm to reciprocate in the second zone.

11. The cleaning system as claimed in claim 8, wherein the driving means is provided with a driving shaft, the shower arm is provided with a rotating shaft, the body of the sensing member is connected with the driving shaft or the rotating shaft, the first sensing portion and the second sensing portion are protrudingly provided on the outer wall of the body, the number of the first sensing portion is 1, and the number of the second sensing portion is at least 1.

12. The cleaning system of claim 8, wherein the detection device comprises any one of: photoelectric groove type sensor, hall sensor, reflection type sensor.

13. The cleaning system of claim 11, wherein the drive shaft is in driving communication with a rotatable shaft of the spray arm via a gear train, and the sensing element is disposed on the drive shaft or the rotatable shaft.

14. The cleaning system of claim 13, wherein the detecting device is a photoelectric groove type sensor, a mounting housing is provided around the driving shaft or the rotating shaft, the detecting member is fixed to the mounting housing, a photoelectric groove is provided on the detecting member, and the first sensing portion and the second sensing portion sequentially pass through the photoelectric groove when the sensing member moves along with the driving shaft or the rotating shaft.

15. A dishwasher, comprising a washing system as claimed in any one of claims 4 to 14, and a dish rack located above the spray arm, the dish rack having the area to be washed formed therein.