CN219059456U - Safety switch and washing machine - Google Patents

Abstract

The application provides a safety switch and washing machine, wherein safety switch for washing machine includes: the collision rod is connected with the washing machine body; the first capacitor plate is connected with the washing machine body and is arranged opposite to one side of the collision rod, which is away from the washing machine body; the second capacitance sheet is connected to one side of the collision bar, which is away from the washing machine body, and is arranged at intervals with the first capacitance sheet. When the striker in the safety switch provided by the embodiment of the application receives the impact force, the striker drives the second capacitance piece to deviate, and the relative area between the first capacitance piece and the second capacitance piece changes, so that the capacitance between the first capacitance piece and the second capacitance piece changes, the power supply is cut off according to the capacitance change value between the first capacitance piece and the second capacitance piece, the dewatering barrel stops rotating, and the safety protection sensitivity of the safety switch in the washing machine is improved.

Description

Safety switch and washing machine

Technical Field

The application belongs to the technical field of household appliances, and particularly relates to a safety switch and a washing machine.

Background

The washing machine is provided with a safety switch to control whether the dewatering barrel stops rotating or not through the safety switch (a barrel collision switch), and the working principle is that: when the washing machine is used for dewatering, a user opens a door cover of the washing machine or clothes in a dewatering barrel are unbalanced or the washing machine is used for dewatering, the amplitude is increased when the dewatering barrel rotates, the dewatering barrel impacts a ram of a safety switch, the top of the ram moves around a shaft, a group of reeds can be jacked up to enable the two reeds to be completely separated, so that a current signal of the switch is disconnected, a program controller of the washing machine detects that the current signal of the safety switch is disconnected, and the current of a motor is cut off, so that the dewatering barrel stops rotating, and the personal safety of the user is protected or the damage of the washing machine caused by the impact of the dewatering barrel on the washing machine is avoided.

However, when the striking rod of the safety switch of the current washing machine is impacted by the dewatering barrel, the two reeds can be separated incompletely, namely, when the clothes in the dewatering barrel of the washing machine are dewatered in an unbalanced mode, even if the striking rod is impacted by the dewatering barrel, the condition that the power supply cannot be cut off to control the dewatering barrel to stop rotating exists, and the safety protection sensitivity of the safety switch in the washing machine is low.

Disclosure of Invention

An embodiment of the present application provides a safety switch for a washing machine, including:

the collision rod is connected with the washing machine body;

the first capacitor plate is connected with the washing machine body and is arranged opposite to one side of the collision rod, which is away from the washing machine body;

the second capacitance sheet is connected to one side of the collision bar, which is away from the washing machine body, and is arranged at intervals with the first capacitance sheet.

In some embodiments, the second capacitor plate is disposed parallel to the first capacitor plate, and the centers of the second capacitor plate and the first capacitor plate are located on the same axis.

In some embodiments, the first and second capacitive plates are the same shape and size.

In some embodiments, the protective box further comprises a protective box, the protective box is provided with a containing cavity, the protective box is provided with a mounting hole for the striker rod to penetrate through, the mounting hole is communicated with the containing cavity, and the first capacitor plate and the second capacitor plate are both located in the containing cavity.

In some embodiments, a base is arranged in the accommodating cavity, the base is provided with an accommodating cavity which is provided with an opening facing the first capacitor plate and has a spherical shape, and the mounting hole is communicated with the accommodating cavity; the accommodating cavity is internally provided with a supporting body, the supporting body is accommodated in the accommodating cavity, the supporting body is provided with a first supporting surface which is matched and attached with the cavity surface of the accommodating cavity and a second supporting surface which faces the first capacitor plate, the striker is connected to the first supporting surface, and the second capacitor plate is connected to the second supporting surface.

In some embodiments, the striker bar is detachably connected to the support body, and the striker bar is perpendicular to the second support surface.

In some embodiments, the support is a hemisphere with a sphere cut along a diameter, the hemisphere surface of the hemisphere is a first support surface, and the cut surface formed by cutting is a second support surface.

In some embodiments, the protection device further comprises an elastic piece, the elastic piece is sleeved on the collision rod, the collision rod is provided with a limiting surface facing the protection box, the limiting surface is located outside the containing cavity, one end of the elastic piece is elastically abutted to the protection box, and the other end of the elastic piece is elastically abutted to the limiting surface.

In some embodiments, the plunger comprises a first rod body and a second rod body with the same length extension direction, one end of the first rod body is connected with the washing machine body, the other end of the first rod body is sleeved on the outer side of the second rod body, and one end of the second rod body, which is away from the first rod body, is connected with the support body; one end of the first rod body facing the protection box is provided with a boss, and one surface of the boss facing the protection box is a limiting surface.

As a second aspect of the embodiments of the present disclosure, embodiments of the present application provide a washing machine including the safety switch of any one of the embodiments described above.

According to the safety switch and the washing machine, when the striker in the safety switch is impacted, the striker drives the second capacitance piece to deviate, the relative area between the first capacitance piece and the second capacitance piece changes, the capacitance between the first capacitance piece and the second capacitance piece changes, the power supply is cut off according to the capacitance change value between the first capacitance piece and the second capacitance piece, the dewatering barrel stops rotating, and the safety protection sensitivity of the safety switch in the washing machine is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

Fig. 1 is a schematic cross-sectional structure of a safety switch according to an embodiment of the present application.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments herein.

The embodiment of the application provides a safety switch 10, which is applied to a washing machine. The washing machine may be a pulsator washing machine, and of course, the washing machine may also be a drum washing machine, and the embodiment of the present application does not limit the type of washing machine. The embodiment of the application takes a washing machine as an impeller washing machine as an example for explanation

Before explaining the safety switch 10 of the embodiment of the present application in detail, an explanation will be given of the structure of the washing machine. The washing machine may include a washing machine body, an outer tub, a dehydrating tub, a safety switch 10, and a controller. The washing machine body has an accommodation space in which the outer tub, the dehydrating tub, the safety switch 10, and the controller are all disposed. The outer barrel is arranged in the accommodating space, and one end of the outer barrel, which is opposite to the opening, is fixedly connected with the washing machine body. The dewatering barrel is arranged in the outer barrel, and one end of the dewatering barrel, which is opposite to the opening, is rotationally connected with the outer barrel. The safety switch 10 is arranged in the accommodating space and fixed with the washing machine body, and the safety switch 10 is positioned at the outer side of the outer barrel and used for sensing whether the outer barrel shakes or not. The controller is located in the accommodating space, and the specific installation position of the controller is not limited in the embodiment of the application and is adjusted according to actual conditions; in addition, the controller is electrically connected with the safety switch 10 and the dehydration tub, respectively, to control whether the dehydration tub is rotated by detecting the state of the safety switch 10.

It should be noted that, during normal dehydration of the dehydration barrel, vibration is generated to cause the outer barrel to shake, but it is understood that the shake of the outer barrel under normal conditions does not actuate the change of the safety switch 10, so the controller does not control the dehydration barrel to stop running; when the washing machine is used for dewatering, a user opens a door cover of the washing machine or clothes in a dewatering barrel are unbalanced or the washing machine is used for dewatering, when the dewatering barrel rotates, the amplitude is increased, the outer barrel shakes and aggravates, the outer barrel shakes and hits the striker rod 100 of the safety switch 10, the controller can control the dewatering barrel to stop rotating according to the detected state of the safety switch 10, and the outer barrel shaking severely is prevented from hitting the washing machine body, so that the washing machine is damaged, and the service life of the washing machine is influenced.

In some embodiments, referring to fig. 1, a safety switch 10 includes: a striker 100 connected to the washing machine body; the first capacitance piece 200 is connected to the washing machine body and is arranged opposite to one side of the plunger 100 away from the washing machine body; the second capacitor plate 300 is connected to one side of the striker 100 facing away from the washing machine body and is spaced apart from the first capacitor plate 200.

Capacitance formula:

epsilon is the relative permittivity, where S represents the facing area between two capacitive plates, d is the distance between two capacitive plates, and k is the electrostatic force constant.

It should be noted that, the shape of the striking rod 100 may be a circular rod, or may be a square rod, and preferably, the shape of the striking rod 100 is a circular shape, and the circular rod is more convenient to sense the impact given by the outer barrel, and meanwhile, the circular rod is more uniformly stressed and is not easy to break under the condition of the impact force applied from the outside, so that the sensitivity of the safety switch 10 is better and superior, and the service life of the safety switch 10 is prolonged. In addition, in the embodiment of the present application, the length of the striker 100 is not limited, and the length of the striker 100 should be selected and adjusted according to the height of the receiving cavity 410 of the washing machine body.

The shapes and sizes of the first capacitor plate 200 and the second capacitor plate 300 are not particularly limited in this application, and the shapes and sizes of the first capacitor plate 200 and the second capacitor plate 300 may be the same, different, or partially the same. For example, the first capacitor plate 200 and the second capacitor plate 300 may have a circular shape, a rectangular shape, a diamond shape, a square shape, or the like; also, for example, the first capacitor plate 200 and the second capacitor plate 300 have the same shape and different sizes; also for example, the first and second capacitor plates 200 and 300 are different in shape and size, the first capacitor plate 200 may be circular, and the second capacitor plate 300 may be rectangular, diamond-shaped, or the like.

In addition, it should be noted that the size of the first capacitor plate 200 should be greater than or equal to the size of the second capacitor plate 300, so as to avoid that when the striker 100 receives an impact force, the end of the striker 100 connected to the second capacitor plate 300 is offset, the second capacitor plate 300 is inclined, the relative area between the first capacitor plate 200 with smaller size and the second capacitor plate 300 with larger size is not changed, and the capacitance between the first capacitor plate 200 and the second capacitor plate 300 is not changed, so that the controller may misjudge.

In this embodiment, the end of the striking rod 100 facing away from the washing machine body is suspended, when the striking rod 100 receives the impact force during dehydration, the suspended end of the striking rod 100 can deviate, so that the second capacitance piece 300 located on the end face of the suspended end of the striking rod 100 is inclined, and the first capacitance piece 200 is connected to the washing machine body, so that the first capacitance piece 200 cannot change. Therefore, when the second capacitive plate 300 is inclined, due to the length limitation of the striker 100, the change of the distance between the second capacitive plate 300 and the first capacitive plate 200 is negligible, the relative area between the second capacitive plate 300 and the first capacitive plate 200 is changed, so that the capacitance between the second capacitive plate 300 and the first capacitive plate 200 is changed, and the controller controls the dewatering drum to stop rotating when detecting the change of the capacitance between the first capacitive plate 200 and the second capacitive plate 300.

Since the capacitance between the capacitance sheets is easy to change and the change is obvious and is easier to be detected by the controller, the sensitivity of the safety switch 10 can be improved by using the first capacitance sheet 200 and the second capacitance sheet 300 to replace two reeds, and thus the safety protection sensitivity of the safety switch 10 in the washing machine is improved.

In addition, in the embodiment of the application, the controller can also judge the eccentricity of the dewatering barrel according to the detected capacitance value variation, and set the dewatering rotating speed of the washing machine according to the eccentricity of the dewatering barrel, so that the influence on the service life of the washing machine caused by the damage of the dewatering barrel to the washing machine due to sudden stop of the dewatering barrel from high-speed rotation is prevented. For example, when the capacitance change value is small, the washing machine can adopt high-rotation-speed dehydration, and as the capacitance change value is increased, the rotation speed of the dehydration needs to be reduced, even the dehydration barrel cannot dehydrate, and the capacitance change value needs to be detected again after the clothes in the dehydration barrel are leveled by re-entering water.

In one embodiment, referring to fig. 1, in some embodiments, the second capacitor plate 300 is disposed parallel to the first capacitor plate 200, and the centers of the second capacitor plate 300 and the first capacitor plate 200 are located on the same axis.

In this embodiment of the present application, through setting up first electric capacity piece 200 and second electric capacity piece 300 in parallel, and make the center of second electric capacity piece 300 and first electric capacity piece 200 lie in same axis, when ram 100 receives the striking, the relative area between first electric capacity piece 200 and the second electric capacity piece 300 changes more obviously, and whether the controller can be accurate according to sensing the electric capacity change value and control the dehydration bucket and rotate, has further promoted the safety protection sensitivity of safety switch 10 in the washing machine.

In one embodiment, referring to fig. 1, the first and second capacitor plates 200 and 300 are the same shape and size.

It can be appreciated that in the embodiment of the present application, when the shapes and sizes of the first capacitive plate 200 and the second capacitive plate 300 are the same, the second capacitive plate 300 can cause the capacitance change between the first capacitive plate 200 and the second capacitive plate 300 as long as the second capacitive plate 300 is shifted or inclined, and the controller can accurately control whether the dewatering tub rotates according to the sensed capacitance change value, so that the safety protection sensitivity of the safety switch 10 in the washing machine can be further improved for the design that the shapes and sizes of the first capacitive plate 200 and the second capacitive plate 300 are the same.

In some embodiments, referring to fig. 1, the protection box 400 further includes a housing cavity 410, the protection box 400 is provided with a mounting hole 420 for the striker 100 to pass through, the mounting hole 420 is communicated with the housing cavity 410, and the first capacitor plate 200 and the second capacitor plate 300 are both located in the housing cavity 410.

Illustratively, the protective case 400 extends outward from an outer edge, and a through hole is provided on the outer edge, through which a screw or a pin is coupled to the washing machine body, thereby fixing the protective case 400 to the washing machine body. Further, there are two through holes, set up on the outer edge of the opposite both sides of protection box 400, through respectively being provided with a through hole on the outer edge of the opposite both sides of protection box 400, screw or pin pass the through hole respectively and be connected with the washing machine body, can make the protection box 400 more firm of installation on the washing machine body, be difficult for dropping.

Illustratively, the mounting hole 420 is provided at the bottom of the protective case 400, the first capacitor plate 200 is adhered to the wall of the top of the accommodating chamber 410 of the protective case 400 by an adhesive, and the mounting hole 420 is located directly under the first capacitor plate 200.

In the embodiment of the present application, since the environment within the washing machine body is relatively humid, the relative dielectric constant between the first and second capacitive plates 200 and 300 may be affected. For example, normally, the medium between the first and second capacitance plates 200 and 300 is air; in a humid environment, the medium between the first and second capacitive plates 200 and 300 contains small water droplets in addition to air, thereby causing a change in the relative dielectric constant between the first and second capacitive plates 200 and 300, thereby affecting the safety protection sensitivity of the safety switch 10 in the washing machine. Therefore, the safety switch 10 in the embodiment of the present application further includes the protection box 400 to accommodate the first capacitor plate 200 and the second capacitor plate 300, so as to avoid the medium between the first capacitor plate 200 and the second capacitor plate 300 from changing, thereby affecting the safety protection sensitivity of the safety switch 10 in the washing machine. Meanwhile, the protection case 400 can also protect the first and second capacitor plates 200 and 300 from being corroded in a humid environment, and the service life of the safety switch 10 is prolonged.

As shown in fig. 1 and 2, the cross-sectional area of the mounting hole 420 is larger than that of the striker 100, so that the longitudinal extension direction of the striker 100 can be deviated from the axial direction of the mounting hole 420 when the striker 100 receives a lateral collision force in an arbitrary direction.

It should be noted that, the shapes and sizes of the protection case 400 and the accommodating cavity 410 are not particularly limited in the embodiments of the present application, and only needs to be able to satisfy that the accommodating cavity 410 can accommodate the first capacitor plate 200 and the second capacitor plate 300, and enable the second capacitor plate 300 to deviate or incline in the accommodating cavity 410. For example, the protection case 400 may be circular, square, oval, etc., and the receiving chamber 410 may be circular, square, or irregularly shaped, etc.

In some embodiments, referring to fig. 1, a base 500 is disposed in the accommodating cavity 410, the base 500 has an accommodating cavity 510 with an opening facing the first capacitor plate 200 and a spherical cavity surface 511, and the mounting hole 420 is communicated with the accommodating cavity 510; the accommodating cavity 410 is further provided with a supporting body 600, the supporting body 600 is accommodated in the accommodating cavity 510, the supporting body 600 is provided with a first supporting surface 610 and a second supporting surface 620, the first supporting surface 610 is fit with the cavity surface 511 of the accommodating cavity 510, the second supporting surface 620 faces the first capacitor plate 200, the striker 100 is connected to the first supporting surface 610, and the second capacitor plate 300 is connected to the second supporting surface 620.

Illustratively, the second support surface 620 is substantially parallel to the first capacitive plate 200.

It will be appreciated that the cross-sectional area of the receiving cavity 510 is greater than the cross-sectional area of the support body 600 as shown in fig. 1 and 2, so that the support body 600 can move within the receiving cavity 510.

In this embodiment, when the striker 100 receives a lateral collision force in any direction, the striker 100 can drive the first supporting surface 610 of the supporting body 600 to rotate against the cavity surface 511 of the accommodating cavity 510, so that the length extending direction of the striker 100 deviates from the axial direction of the mounting hole 420. Meanwhile, the second supporting surface 620 is inclined to the first capacitive plate 200 under the driving of the deviated motion of the plunger 100, so that the second capacitive plate 300 connected to the second supporting surface 620 is also inclined to the first capacitive plate 200, thereby changing the capacitance between the first capacitive plate 200 and the second capacitive plate 300, the controller can detect the capacitance value between the first capacitive plate 200 and the second capacitive plate 300 in real time, and when the capacitance change value reaches a preset threshold value, the controller can control the dewatering barrel to stop rotating.

Therefore, in the embodiment of the present application, when the washing machine is in an unbalanced dehydration state, the dehydration tub of the washing machine collides with the outer tub, so that the outer tub collides with the striker 100 to apply a lateral collision force to the striker 100, thereby changing the capacitance between the first and second capacitance sheets 200 and 300, and the controller stops the unbalanced dehydration according to the detected capacitance change value, thereby improving the safety of the washing machine.

Illustratively, the striker 100 is connected to the center of the first support surface 610 that is spherically disposed; of course, the striker 100 may be slightly offset from the center of the first supporting surface 610, so long as the supporting body 600 is rotationally engaged with the cavity surface 511 of the accommodating cavity 510 of the base 500 through the first supporting surface 610 when the striker 100 is offset from the axial direction of the mounting hole 420 due to the lateral collision force.

In some embodiments, the striker 100 is detachably connected to the support 600, and the striker 100 is perpendicular to the second support surface 620.

It will be appreciated that by providing the striker 100 and the support 600 in detachable connection, maintenance can be facilitated to reduce maintenance costs. For example, when the striker 100 is broken, only the striker 100 need be replaced without replacing the support body 600, thereby reducing the maintenance cost of the striker 100 broken.

It should be noted that, the detachable connection between the striker 100 and the support body 600 may be a threaded connection or an interference fit connection. For example, when the detachable connection of the striker 100 and the support body 600 is an interference fit connection, specifically, a key groove is provided at an end of the striker 100 to which the support body 600 is connected, and when the striker 100 is connected to the support body 600, a key is placed in the key groove, by which the striker 100 is connected to the support body 600. Also, for example, when the detachable connection of the striker 100 and the support body 600 is a threaded connection, one end of the striker 100 connected to the support body 600 is a threaded end provided with external threads, the support body 600 is provided with a threaded hole at the center of the first support surface 610, and the striker 100 is fixedly connected to the support body 600 by being fitted in the threaded hole through the threaded end. Of course, in other embodiments of the present application, the striker 100 may also be integrally formed with the support 600.

It should be further noted that, when the plunger 100 is perpendicular to the second supporting surface 620 and the plunger 100 is inclined under impact, the second supporting surface 620 is inclined and drives the second capacitor plate 300 thereon to incline, and when the second capacitor plate 300 is inclined, the relative area between the second capacitor plate 300 and the first capacitor plate 200 is changed, so that the capacitance between the second capacitor plate 300 and the first capacitor plate 200 is changed, and the controller controls whether the dewatering tub rotates according to the capacitance change value between the second capacitor plate 300 and the first capacitor plate 200, thereby improving the safety protection sensitivity of the safety switch 10 in the washing machine.

In some embodiments, as shown in fig. 1, the support 600 is a hemisphere with a sphere cut along a diameter, a hemisphere surface of the hemisphere is a first support surface 610, and a cut surface formed by cutting is a second support surface 620.

In some embodiments, referring to fig. 1, the device further includes an elastic member 700, the elastic member 700 is sleeved on the striker 100, the striker 100 is provided with a limiting surface 131 facing the protection box 400, the limiting surface 131 is located outside the accommodating cavity 410, one end of the elastic member 700 is elastically abutted against the protection box 400, and the other end of the elastic member 700 is elastically abutted against the limiting surface 131.

In this embodiment, under the action of the elastic force of the elastic member 700, the striker 100 and the support body 600 are both subjected to downward force, so that after the striker 100 receives the lateral collision force to make the length extension direction of the striker 100 deviate from the axial direction of the mounting hole 420, if the collision force disappears, the length extension direction of the striker 100 can return to the axial direction of the mounting hole 420 under the action of the elastic force of the elastic member 700, that is, under the action of the elastic force of the elastic member 700, if the collision force is smaller, the striker 100 can return to the initial position better.

Illustratively, the elastic member 700 is a compression spring, and the initial state of the compression spring is a compressed state, so as to ensure that the striker 100 and the support 600 are both subjected to downward force when the striker 100 is not impacted. Meanwhile, the compression springs in the compressed state can enable the first supporting surface 610 of the supporting body 600 to be fitted to the cavity surface 511 of the accommodating cavity 510 of the base 500 at any time. Of course, in other embodiments of the present application, the elastic member 700 may also be a rubber sleeve or the like.

In some embodiments, referring to fig. 1, the striker 100 includes a first rod 110 and a second rod 120 with the same length extending direction, one end of the first rod 110 is connected to the washing machine body, the other end of the first rod 110 is sleeved on the outer side of the second rod 120, and one end of the second rod 120 facing away from the first rod 110 is connected to the support 600; one end of the first rod body 110 facing the protection box 400 is provided with a boss 130, and one surface of the boss 130 facing the protection box 400 is a limiting surface 131.

It is understood that the boss 130 is also sleeved on the outer side of the second rod 120. The shape and size of the boss 130 are not specifically required in the embodiment of the present application, and should be selected according to the actual application scenario, as long as the side of the boss 130 facing the protection box 400 can limit the movement of the elastic member 700.

In one possible embodiment, the striker 100 includes a first rod 110 and a second rod 120 having the same length extending direction, one end of the first rod 110 is connected to the washing machine body, the other end of the first rod 110 is connected to the second rod 120, one end of the second rod 120 facing away from the first rod 110 is connected to the supporting body 600, the cross-sectional area of the first rod 110 is larger than the cross-sectional area of the second rod 120, and the limiting surface 131 is formed on an end surface of the end of the first rod 110 connected to the second rod 120.

In one possible embodiment, the striker 100 is provided with a ring-shaped body, and the ring-shaped sports striker 100 is fixedly connected. For example, the ring may be fixedly connected to the striker 100 by welding; the ring may also be integrally formed with the striker 100. At this time, the limiting surface 131 is a surface of the ring body facing the protection case 400.

As a second aspect of the embodiments of the present disclosure, embodiments of the present application provide a washing machine including the safety switch 10 of any one of the embodiments described above. The structure of the washing machine is described in the foregoing, and will not be described again here.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more features.

The safety switch 10 and the washing machine provided in the embodiments of the present application are described in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the description of the above examples is only for helping to understand the method and core ideas of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.

Claims (10)

1. A safety switch for a washing machine, comprising:

the collision rod is connected with the washing machine body;

the first capacitor plate is connected to the washing machine body and is arranged opposite to one side of the collision rod, which is away from the washing machine body;

the second capacitance sheet is connected to one side of the collision rod, which is away from the washing machine body, and is arranged at intervals with the first capacitance sheet.

2. The safety switch of claim 1, wherein the second capacitive plate is disposed parallel to the first capacitive plate and the second capacitive plate is centered on the same axis as the first capacitive plate.

3. The safety switch of claim 1, wherein the first and second capacitive plates are identical in shape and size.

4. The safety switch of claim 1, further comprising a protective case having a receiving cavity, the protective case being provided with a mounting hole for the striker rod to pass through, the mounting hole being in communication with the receiving cavity, and the first capacitive plate and the second capacitive plate being both located in the receiving cavity.

5. The safety switch according to claim 4, wherein a base is provided in the accommodation chamber, the base has an accommodation chamber which is opened toward the first capacitance piece and is provided in a spherical shape, and the mounting hole communicates with the accommodation chamber; the accommodating cavity is internally provided with a supporting body, the supporting body is accommodated in the accommodating cavity, the supporting body is provided with a first supporting surface which is matched and attached with the cavity surface of the accommodating cavity and a second supporting surface which faces the first capacitor plate, the striker is connected to the first supporting surface, and the second capacitor plate is connected to the second supporting surface.

6. The safety switch of claim 5, wherein the striker bar is detachably connected to the support body and the striker bar is perpendicular to the second support surface.

7. The safety switch of claim 5, wherein the support is a hemisphere with a sphere cut along a diameter, a hemisphere surface of the hemisphere is a first support surface, and a cut surface formed by cutting is a second support surface.

8. The safety switch according to claim 5, further comprising an elastic member, wherein the elastic member is sleeved on the striker, the striker is provided with a limiting surface facing the protection box, the limiting surface is located outside the accommodating cavity, one end of the elastic member is elastically abutted to the protection box, and the other end of the elastic member is elastically abutted to the limiting surface.

9. The safety switch according to claim 8, wherein the striker comprises a first rod body and a second rod body with the same length extending direction, one end of the first rod body is connected with the washing machine body, the other end of the first rod body is sleeved outside the second rod body, and one end of the second rod body, which is away from the first rod body, is connected with the support body; one end of the first rod body facing the protection box is provided with a boss, and one surface of the boss facing the protection box is a limiting surface.

10. A washing machine comprising a safety switch as claimed in any one of claims 1 to 9.

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