KR20100084884A - Damper assembly, vacuum cleaner having the same and motor-protection and dust dumping period-alarming method using the same - Google Patents

Abstract

PURPOSE: A damper assembly, a vacuum cleaner including the same, and an alarming method for protecting a motor and the time to empty dust are provided to audibly inform the time to empty dust or visually display letter, light and image if the negative pressure of a dust collecting chamber is increased. CONSTITUTION: A damper assembly(50) comprises a casing(52) which includes an air inlet(54), a damper body(56) which includes an air outlet(66), a piston member(60) which moves in a damper body inside between a first location and a second position and is carried with the change of the inner air pressure of the damper body to the second position, an elastic member(68) which elastically pressurizes the piston member to the first location, and a detection sensor(80) which generates an electric signal when the piston member moves to the second position. The piston member shields the interval between the air inlet and the air outlet in the first location and interlinks the air inlet and the air outlet in the second location.

Description

Damper assembly, vacuum cleaner having the same and motor protection and dust emptying notification method using the same {Damper assembly, Vacuum cleaner having the same and motor-protection and dust dumping period-alarming method using the same}

The present invention relates to a vacuum cleaner, and more particularly, to introduce air into the dust collecting chamber when the negative pressure in the dust collecting chamber increases above a certain level, such as when the dust collecting apparatus is filled with dust or dirt (hereinafter referred to as 'dust'). The present invention relates to a damper assembly, a vacuum cleaner having the same, and a motor protection and dust emptying time notification method using the same.

In general, a vacuum cleaner generates a strong suction force by using a suction motor to suck the dust on the surface to be cleaned to clean the surface to be cleaned. Such vacuum cleaners usually include a dust bag for collecting dust from inhaled air, or a dust collector equipped with a cyclone, a dust box, and a filter. Therefore, the air containing the dust sucked by the suction force of the suction motor is discharged to the outside after the dust is removed while passing through the dust collector.

However, when such a vacuum cleaner is cleaned, when dust is accumulated in a dust bag or a cyclone / dust box / filter of the dust collector, the suction power of the suction motor is lowered and the dust collection efficiency is lowered. In particular, if the dust bag or the cyclone / dust container is full of dust or the filter is blocked by dust, the suction motor may be overloaded and shorten its life.

In order to solve this problem, the conventional vacuum cleaner includes a dust display device installed near the dust collector so that the dust display container indicating the emptying time of the dust is moved by the negative pressure when the negative pressure in the dust collector increases above a predetermined level. . The dust display cylinder is normally supported by an elastic spring in a direction opposite to that moving by negative pressure.

However, such a dust display device has to be installed so that the dust display container is exposed to the outside, there is a problem that the installation structure is complicated, such as requiring a dust display window. In addition, since there is no damping function for introducing external air into the dust collector, there is a problem in that the suction motor is continuously overloaded until the dust filled in the dust bag or the cyclone / dust container or the dust accumulated in the filter is cleaned. .

The present invention has been made to solve the above problems of the prior art, an object of the present invention, when the negative pressure in the dust collecting chamber is increased to a certain level or more, such as when the dust collecting apparatus is full of dust, The present invention provides a damper assembly, a vacuum cleaner having the same, and a motor protection and dust emptying time notification method using the same.

According to one embodiment for achieving the above object of the present invention, a damper assembly includes a casing having an air intake; A damper body coupled to the casing and having an air outlet; A piston member installed to move between the first position and the second position within the damper body and moved toward the second position by a change in air pressure inside the damper body; An elastic member for elastically pressing the piston member toward the first position; And a sensor for generating an electrical signal when the piston member moves to the second position, the piston member intercepting between the air inlet and the air outlet when in the first position, and the air inlet and air when in the second position. Characterized in that the outlet is in communication.

Here, the piston member may be formed to seal the air inlet and have an air flow gap between the inner wall of the damper body.

The elastic member may include a first elastic member disposed between the damper body and the piston member.

The sensing sensor is installed between the piston member and the damper body and can be operated by the piston member.

The sensor may be a push switch actuated by a pressing force. In this case, the elastic member further includes a second elastic member disposed inside the first elastic member between the damper body and the piston member, and the damper assembly is supported by the second elastic member and presses the push switch to operate the pressing member. It may further include. At this time, the elastic force (P1) of the first elastic member, the elastic force (P2) of the second elastic member and the pressing force (P3) for operating the push switch preferably satisfy the relationship of P1> P2> P3.

The pressing member may be formed in a rod shape or a plate shape. In this case, the second elastic member may be disposed between the pressing member and the piston member, and the pressing switch may be installed at the bottom of the damper body. Optionally, the second elastic member may be installed on the bottom of the damper body, and the push switch may be installed on the upper surface of the pressing member.

       Optionally, the sensing sensor may include a side push switch installed on an inner wall of the damper body, or may include a magnetic body and a magnetic proximity sensor for sensing the magnetic body. In this case, the magnetic body may be installed on the piston member, and the magnetic proximity sensor may be installed on the inner wall of the damper body.

According to another embodiment for achieving the object of the present invention, a vacuum cleaner, a dust collecting chamber is installed; A motor compartment equipped with a suction motor; A damper assembly as described above, installed in the dust collecting chamber, the air flowing into the dust collecting chamber to increase the pressure of the dust collecting chamber when the negative pressure increases in the dust collecting chamber, and simultaneously generate an electrical signal; And according to the signal of the damper assembly, characterized in that it comprises a notification unit for notifying the outside of the dust emptying time.

Here, the notification unit may include a speaker for generating an alarm sound and / or a display unit for visually displaying a text, a light, an image, and the like.

According to another embodiment for achieving the object of the present invention, the motor protection and dust emptying notification method, the step of increasing the negative pressure of the dust collecting chamber; Moving the piston member of the damper assembly toward the dust collecting chamber while pressing the at least one elastic member; Introducing air into the dust collecting chamber through the damper assembly; The piston member operating the sensing sensor; And informing the outside of the dust emptying time according to an electrical signal generated according to the operation of the detection sensor.

The actuating of the sensing sensor may include pressing the pressing member by the elastic member, and operating the sensing sensor by the pressing member.

Optionally, actuating the sensor may comprise actuating a side push switch in which the piston member is installed on the inner wall of the damper body of the damper assembly. In addition, the actuation of the sensing sensor may include sensing a magnetic body installed in the piston member by a magnetic proximity sensor installed on the inner wall of the damper body of the damper assembly.

As described above, the damper assembly according to the present invention, the vacuum cleaner provided with the same and the motor protection and dust emptying time notification method using the same by introducing air into the dust collecting chamber when the negative pressure increases to a predetermined level or more in the dust collecting chamber It raises the pressure of truth and transmits it to the notification unit electrically to alert you by sound or to display the text, light, image, etc. to the user.

Therefore, as in the conventional dust display apparatus, the dust display window is installed in order to install the dust display container exposed to the outside, so that the installation structure is not complicated. In addition, it has a damping function for introducing external air into the dust collector, so that the suction motor is overloaded and shortened its life even if the dust filled in the dust bag or cyclone / dust container is not immediately emptied or the dust accumulated in the filter is not immediately cleaned. Is prevented.

Hereinafter, a damper assembly according to embodiments of the present disclosure, a vacuum cleaner having the same, and a motor protection and dust emptying time notification method using the same will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a vacuum cleaner 1 to which a damper assembly 50 according to an embodiment of the present invention is applied.

Referring to FIG. 1, the vacuum cleaner 1 of the present invention includes a suction nozzle 10 and a cleaner body 20.

 The suction nozzle 10 is connected to the cleaner body 20 through a suction air passage 12 such as a suction hose (not shown), an extension pipe (not shown), or the like.

The cleaner body 20 has a dust collecting chamber 22 and a motor chamber 27 installed therein. The dust collecting chamber 22 is equipped with a dust collecting device 25 for separating dust from the air sucked through the suction nozzle (10). The dust collector 25 may be composed of a dust bag for collecting dust from inhaled air, or a cyclone dust collector equipped with a cyclone, a dust bin, and a filter.

The motor chamber 27 is equipped with a suction motor 28 for generating a suction force for sucking air through the suction nozzle 10. The motor chamber 27 is connected to the dust collecting chamber 22 through the discharge air passage 29.

In the dust collecting chamber 22 connected to the discharge air passage 29, the damper assembly 50 according to the present invention is disposed. The damper assembly 50 is collected by the suction force of the suction motor 28, such as when the dust bag of the dust collecting device 25, or the cyclone, the dust container, and the filter is filled with dust to become the dust emptying period. When the negative pressure inside increases over a certain level corresponding to the dust emptying period, the external air flows into the dust collecting chamber 22 to raise the pressure of the dust collecting chamber 22 to the atmospheric pressure level, thereby overloading the overload generated in the suction motor 28. The removal and at the same time to inform the user, it is installed in the dust collecting chamber 22 so that a portion of the cleaner body 20 is exposed to the outside.

As shown in FIG. 2A, the damper assembly 50 has a casing 52 fixed to the frame 21 of the cleaner body 20 so that a part thereof is exposed to the outside. The casing 52 is formed of a cylindrical body with an open lower portion. The casing 52 has an air inlet 54 for introducing external air into the dust collecting chamber 22 in order to increase the pressure of the dust collecting chamber 22 in the upper center. The inner upper portion of the casing 52 is formed with a circular fixing groove 58 to which the circular fixing protrusion 57 of the damper body 56 to be described later is fixed.

The damper body 56 is disposed to be located inside the dust collecting chamber 22 and is formed of a cylindrical body having an upper portion open to combine with the casing 52 to form one cylindrical body. The damper body 56 has a smaller diameter than the casing 52 so that the upper portion is inserted into the casing 52. At the upper outer edge of the damper body 56, a circular fixing protrusion 57 fixed to the circular fixing groove 58 of the casing 52 is formed to protrude. Moreover, the guide groove part 64 which guides the movement of the guide protrusion 62 of the piston member 60 mentioned later is formed in the bottom of the damper body 56. As shown in FIG. In addition, an air outlet 66 is formed at the bottom of the damper body 56 to discharge external air sucked through the air suction port 54 into the dust collecting chamber 22. The air outlet 66 may be formed of a plurality of small holes.

The piston member 60 is installed to be movable inside the damper body 56. The piston member 60 is formed in a cylindrical shape with the top closed. The piston member 60 is engaged with the air intake port 54 of the casing 52 by the first elastic member 70 of the elastic member 68 to be described later, as shown in FIG. 2A to seal the air intake 54. It is elastically supported in the first position, that is, the closed position.

In addition, the piston member 60 is formed to have a diameter smaller than that of the damper body 56 to form an airflow gap 76 between the inner wall of the damper body 56. Therefore, when the negative pressure in the dust collecting chamber 22 is increased to a predetermined level corresponding to the dust emptying time by the suction force of the suction motor 28, the negative pressure in the dust collecting chamber 22 is caused by the air outlet of the damper body 56 ( And to the piston member 60 through the airflow gap 76. As a result, as shown in FIG. 2B, the piston member 60 presses the first elastic member 70 against the elastic force of the first elastic member 70 by the negative pressure, while the air inlet 54 and the air outlet port are pressed. In a closed position (see FIG. 2A) blocking the gap between the air inlet 54 and the air outlet 66, a second position that communicates with each other, that is, moving to a sensor operating position where the sensor 80 described later operates. Accordingly, the outside air is introduced into the dust collecting chamber 22 through the air suction port 54, the air flow gap 76, and the air discharge port 66. As the outside air flows into the dust collecting chamber 22, the pressure inside the dust collecting chamber 22 increases to the atmospheric pressure level, thereby overloading the suction motor 28 is eliminated, and the introduced outside air is sucked in. It is discharged to the outside through the motor 28.

The guide protrusion 62 guided along the guide groove 64 of the damper body 56 extends to the inside of the upper end of the guide groove 64 at the inner center of the piston member 60. A spring seating groove 78 is formed in the guide protrusion 62 to which the second elastic member 72 of the elastic member 68 to be described later is installed.

The elastic member 68 includes a first elastic member 70 and a second elastic member 72. The first elastic member 70 is installed between the guide groove 64 of the damper body 56 and the bottom of the damper body 56 and the piston member 60 outside the guide protrusion 62 of the piston member 60. , The piston member 60 is elastically supported in a closed position (see Fig. 2a). The first elastic member 70 may be composed of a compression spring. At this time, when the negative pressure in the dust collecting chamber 22 is increased to a predetermined level corresponding to the dust emptying time, the first elastic member (1) to be moved to the sensor operating position (see FIG. 2B). The elastic force P1 of 70 is preferably set smaller than a preset negative pressure corresponding to the dust emptying time.

The second elastic member 72 is installed in the spring seating groove 78 of the guide protrusion 62. The second elastic member 72 may be composed of a compression spring. The elastic force P2 of the second elastic member 72 is preferably set smaller than the elastic force P1 of the first elastic member 70 in order not to limit the movement of the piston member 60.

Under the second elastic member 72 is provided a pressing member 74 that operates by pressing the detection sensor 80. The pressing member 74 may be formed in the shape of a rod having a spring seating portion at the top.

The second elastic member 72 and the pressing member 74 are the upper surface of the piston member 60 when the piston member 60 moves to the sensor operating position where the sensor 80 is operated by the negative pressure in the dust collecting chamber 22. It is installed to provide a design margin for operating the sensor 80 with a sufficient separation distance to allow the outside air to flow between and the air intake port 54.

In more detail, if the second elastic member 72 and the pressing member 74 are not installed between the piston member 60 and the detection sensor 80, the detection sensor when the piston member 60 moves to the sensor operating position. In order for the 80 to be operated, the guide protrusion 62 of the piston member 60 must be designed to directly operate the detection sensor 80. At this time, if the guide protrusion 62 is formed too close to the detection sensor 80, when the guide protrusion 62 operates the detection sensor 80 by the movement of the piston member 60 of the piston member 60 There is not a sufficient separation distance between the upper surface and the air suction port 54 to allow the outside air to flow. On the other hand, if the guide protrusion 62 is formed too far from the detection sensor 80, there is a problem that the guide protrusion 62 does not operate the detection sensor 80 by the movement of the piston member 60. Therefore, when the second elastic member 72 and the pressing member 74 is installed between the piston member 60 and the detection sensor 80, the separation distance between the upper surface of the piston member 60 and the air intake port 54 and The sensor operating position of the pressing member 74 can be elastically adjusted by adjusting the length and elastic force of the second elastic member 73 and / or the pressing member 74.

As shown in FIG. 2A, the detection sensor 80 generates a detection signal when the piston member 60 moves to the sensor operating position (see FIG. 2B), and the piston member 60 is connected to the dust collecting chamber 22. It operates by the pressing force acting by the pressing member 74 when moving to the sensor operating position by the negative pressure. To this end, the sensor 80 is installed on the bottom of the damper body 54 under the pressing member (74). The detection sensor 80 may be a push switch that operates when it is pressurized with a constant pressing force P3. At this time, in order for the sensing sensor 80 to be operated by the pressing force of the pressing member 74 supported by the second elastic member 72, the pressing force P3 for operating the sensing sensor 80 is the second pressure. It is preferable to be smaller than the elastic force P2 of the elastic member 72. In addition, the sum of the pressing force P3 and the elastic force P1 of the first elastic member 70 increases when the negative pressure in the dust collecting chamber 22 increases to a preset level corresponding to the dust emptying time. In order to be able to move to the operating position, it is desirable to be set smaller than the preset negative pressure corresponding to the dust emptying time.

The controller 30 controls the notification unit 40 to notify the user that the dust is empty when the sensor 80 is operated by the pressing member 74. The controller 30 may be disposed in the cleaner body 20.

The notification unit 40 alarms the dust emptying period with a sound under the control of the controller 30 or visually displays the text, light, image, and the like. To this end, the notification unit 40 may be configured as a speaker 42 for generating an alarm sound and / or a display unit 44 for visually displaying a text, a light, an image, and the like. In this case, the display unit 44 is preferably installed to be exposed to the outside of the cleaner body 20 in order to allow the user to easily recognize the display content.

As described above, the vacuum cleaner 1 having the damper assembly 50 according to an embodiment of the present invention is the home when the negative pressure in the dust collecting chamber 22 increases to a predetermined level corresponding to the dust emptying period The external air flows into the truth 22 to raise the pressure of the dust collecting chamber 22 and at the same time, it is electrically transmitted to the notification unit 40 to alarm by sound or to visually display text, light, images, and the like. Inform Therefore, as in the conventional dust display apparatus, the dust display window is installed in order to install the dust display container exposed to the outside, so that the installation structure is not complicated. In addition, since it has a damping function for introducing external air into the dust collector, the suction motor 28 is overloaded and has a long service life even if the dust filled in the dust bag or cyclone / dust container is not immediately emptied or the dust accumulated in the filter is not immediately cleaned. The problem of shortening is prevented.

In the above, the damper assembly 50 of the vacuum cleaner 1 according to the present invention has been illustrated and described that the pressing member 74 is formed in a rod shape, but the present invention is not limited thereto. For example, as in the damper assemblies 50 'and 50 "shown in FIGS. 3 and 4, the pressing members 74' and 74" may be formed in a plate shape. In the damper assembly 50 ′ shown in FIG. 3, the second elastic member 72 ′ is supported by the spring support 63 of the piston member 60 ′ at the upper part thereof and the lower member is engaged with the pressing member 74 ′. It is connected. The detection sensor 80 is a push switch and is installed at the bottom of the damper body 56. In addition, in the damper assembly 50 "shown in Fig. 4, the second elastic member 72" is provided at the bottom of the damper body 56, and fixes the pressing member 74 "at the top. 80 is a push switch, which is provided on the upper surface of the pushing member 74 ".

In addition, the damper assembly 50 of the vacuum cleaner 1 according to the present invention includes a second elastic member 72 and a pressing member 74, and has been described and illustrated, but the present invention is not limited thereto. For example, as in the damper assembly 50 "'shown in FIG. 5, the elastic member 68' is comprised of a single elastic member, and the sensor 80 'is attached to the inner wall of the damper body 56. As shown in FIG. It may consist of a side push switch 80 'installed and actuated by a piston member 60 ". Also, as in the damper assembly 50 "" shown in FIG. 6, the elastic member 68 'is comprised of a single elastic member, and the sensor 80 "is made of a magnetic body 82 such as a circular magnet bar, and a magnetic body. And a magnetic proximity sensor 84 for sensing 82. At this time, the magnetic body 82 is installed under the piston member 60 "', and the magnetic proximity sensor 84 is a damper body 56. Can be installed on the inner wall of the.

Motor protection and dust emptying timing of the vacuum cleaner 1 having the damper assembly 50, 50 ', 50 ", 50"', 50 "" according to an embodiment of the present invention having the configuration as described above The notification operation will be described in detail with reference to FIG. 7 as follows.

First, when the suction motor 28 operates as power is applied to the vacuum cleaner 1, the air containing the dirt on the surface to be cleaned is collected through the suction nozzle 10 and the air suction passage 12. It is introduced into the dust collector 25 of the. The air introduced into the dust collector 25 is separated from the dirt by the dust collector 25, and the separated dirt is discharged to the outside through the suction motor 28 through the air discharge passage 29.

As the vacuum cleaner 1 operates as described above, when dust is accumulated in the dust bag, the cyclone, the dust container, and the filter of the dust collector 25, and the dust is filled in the dust collector 25, the dust collector 25 The air flow passing through) is not smoothed by the dust accumulated in the dust collector 25. As a result, the negative pressure in the dust collecting chamber 22 is increased (S1).

When the negative pressure of the dust collecting chamber 22 reaches a preset level corresponding to the dust emptying time, the piston member 60 is subjected to the first against the elastic force of the first and second elastic members 70 and 72 by the negative pressure. And moving in the direction of the dust collecting chamber 22 while pressing the second elastic members 70 and 72 (S2).

As a result, the piston member 60 has a sensor operating position for communicating the air inlet 54 and the air outlet 66 in a closed position (see FIG. 2A) that blocks the air inlet 54 and the air outlet 66. 2b), the external air is introduced into the dust collecting chamber 22 through the air suction port 54, the air flow gap 76 and the air discharge port 66, and then through the suction motor 28. It is discharged to the outside (S3).

When the piston member 60 is moved to the sensor operation position, the detection sensor 80 is operated by the piston member 60, and generates an electrical detection signal (S4).

That is, as the piston member 60 moves, as shown in FIG. 2B (and FIG. 3), the pressing members 74 and 74 'are compressed by the piston members 60 and 60'. (72. 72 ') actuates the sensor 80.

Optionally, in the damper assembly 50 "shown in FIG. 4, the piston member 60" is provided with a sensing sensor 80 provided on the upper surface of the pressing member 74 "elastically supported by the second elastic member 72". It works.

In addition, in the damper assembly 50 "'shown in FIG. 5, the piston member 60" actuates the side sensor 80' installed in the inner wall of the damper body 56. As shown in FIG.

In addition, in the damper assembly 50 "" shown in FIG. 6, the magnetic body 82 provided in the piston member 60 "'has the magnetic proximity sensor 84 of the sensor 80" installed in the inner wall of the damper body 52. Is detected, and accordingly, the magnetic proximity sensor 84 generates a detection signal.

According to the detection signal generated from the detection sensor (80, 80 ', 80 "), the control unit 30 controls the notification unit 40 to inform the user of the dust emptying time (S5). Detects that the dust is empty according to the sound generated from, or text, light, image, etc., the dust accumulated in the dust collector 25 is cleaned or cleaned.

In the above, the present invention has been described and illustrated in connection with embodiments for illustrating the principle, but the present invention is not limited to the configuration and operation shown and described as such. In addition, it will be understood by those skilled in the art that various changes and modifications can be made to the present invention without departing from the spirit and scope of the appended claims. Accordingly, all suitable changes, modifications, and equivalents to the present invention should be considered to be within the scope of the present invention.

1 is a block diagram of a vacuum cleaner having a damper assembly according to an embodiment of the present invention;

2A and 2B are cross-sectional views illustrating the operation of the damper assembly shown in FIG. 1;

3 is a cross-sectional view of a variant of the damper assembly shown in FIG. 2A, FIG.

4 is a cross-sectional view of another variant of the damper assembly shown in FIG. 2A;

FIG. 5 is a cross-sectional view of another variant of the damper assembly shown in FIG. 2A;

FIG. 6 is a cross-sectional view of another variant of the damper assembly shown in FIG. 2A, and FIG.

FIG. 7 is a flowchart illustrating a motor protection and dust emptying time notification mechanism of the vacuum cleaner shown in FIG. 1.

<Description of the symbols for the main parts of the drawings>

1: vacuum cleaner 22: dust collecting chamber

25: dust collector 30: control unit

40: notification unit 50, 50 ', 50 ", 50"', 50 "": damper assembly

52: casing 54: air intake

56: damper body 60, 60 ', 60 ", 60"': piston member

66: air outlet 68, 68 ': elastic member

70: first elastic member 72, 72 ', 72 ": second elastic member

74, 74 '. 74 ": pressing member 76: airflow gap

80, 80 ', 80 ": Sensor

Claims (19)

A casing having an air intake; A damper body coupled to the casing and having an air outlet; A piston member installed to move between a first position and a second position in the damper body, and moved to a second position by a change in air pressure inside the damper body; An elastic member for elastically pressing the piston member toward the first position; And A detection sensor generating an electrical signal when the piston member moves to the second position, And said piston member interrupts between said air inlet and said air outlet when in said first position and communicates said air inlet and said air outlet when in said second position. The damper assembly of claim 1, wherein the piston member is formed to seal the air inlet and to have an airflow gap between the damper body and the inner wall of the damper body. The damper assembly of claim 1, wherein the elastic member comprises a first elastic member disposed between the damper body and the piston member. 4. The damper assembly of claim 3, wherein the sensing sensor is installed between the piston member and the damper body and is operated by the piston member. 5. The damper assembly of claim 4, wherein the sensor includes a push switch actuated by a pressing force. The method of claim 5, The elastic member further comprises a second elastic member disposed inside the first elastic member between the damper body and the piston member, The damper assembly further includes a pressing member which is supported by the second elastic member and presses the push switch to operate the vacuum damper assembly. The method of claim 6, wherein the elastic force (P1) of the first elastic member, the elastic force (P2) of the second elastic member and the pressing force (P3) for operating the push switch satisfy the relationship of P1> P2> P3. Damper assembly of the vacuum cleaner, characterized in that. 7. The damper assembly of claim 6, wherein the pressing member is formed in one of a rod shape and a plate shape. The method of claim 8, The second elastic member is disposed between the pressing member and the piston member, The push switch is a damper assembly of the vacuum cleaner, characterized in that installed on the bottom of the damper body. The method of claim 8, The second elastic member is installed on the bottom of the damper body, The push switch is a damper assembly of the vacuum cleaner, characterized in that installed on the upper surface of the pressing member. The damper assembly of claim 4, wherein the sensing sensor comprises a side push switch installed on an inner wall of the damper body. The method of claim 4, wherein the detection sensor, Magnetic material; And Damper assembly of the vacuum cleaner comprising a magnetic proximity sensor for sensing the magnetic material. The method of claim 12, The magnetic body is installed in the piston member, The magnetic proximity sensor is a damper assembly of a vacuum cleaner, characterized in that installed on the inner wall of the damper body. A dust collecting chamber equipped with a dust collecting device; A motor compartment equipped with a suction motor; 15. The air purifier of any one of claims 1 to 13, which is installed in the dust collecting chamber and generates air by introducing air into the dust collecting chamber when the negative pressure increases in the dust collecting chamber, thereby increasing the pressure of the dust collecting chamber. Damper assembly; And And a notification unit for notifying the outside of the dust emptying time according to the signal of the damper assembly. The vacuum cleaner of claim 14, wherein the notification unit comprises at least one of a speaker for generating an alarm sound and a display for visually displaying a text, a light, an image, and the like. Increasing the negative pressure of the dust collecting chamber; Moving the piston member of the damper assembly toward the dust collecting chamber while pressing the at least one elastic member; Introducing air into the dust collecting chamber through the damper assembly; The piston member operating a sensing sensor; And       Motor protection and dust empty time notification method comprising the step of informing the dust emptying time in accordance with the signal generated by the operation of the sensor. The method of claim 16, wherein the actuating the sensor comprises: Pressing the pressing member by the elastic member; And       The pressing member comprises the step of operating the detection sensor motor protection and dust emptying time notification method of the vacuum cleaner. 17. The motor protection and dust evacuation of the vacuum cleaner according to claim 16, wherein the actuating of the sensing sensor comprises actuating a side push switch of the piston member installed on the inner wall of the damper body of the damper assembly. Notification method. 17. The method of claim 16, wherein the actuating of the sensor comprises the step of detecting a magnetic body installed in the piston member by a magnetic proximity sensor installed on the inner wall of the damper body of the damper assembly. How to notify when the dust is empty.

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