KR100710270B1 - Motor chamber of vacuum cleaner - Google Patents

Abstract

The present invention relates to a motor chamber of a vacuum cleaner that can reduce the noise generated in the vacuum cleaner. The present invention is installed on the chamber housing having a motor installation unit for installing a fan-motor assembly for sucking and forced air flow and an exhaust unit through which the air is discharged through the fan-motor assembly, and is installed on an upper portion of the chamber housing. And a chamber cover having a chamber inlet through which air is introduced into the chamber housing, wherein the exhaust area of the exhaust unit is determined according to a frequency of noise to be reduced by the user.

According to the present invention, the suction work rate of the vacuum cleaner can reduce the noise generated by the motor while maintaining a constant level.

Vacuum cleaner, motor chamber, exhaust section, exhaust area ratio

Description

Motor chamber of the vacuum cleaner

1 is a perspective view of a vacuum cleaner having a motor chamber according to the present invention.

FIG. 2 is a perspective view illustrating the cleaner body and the dust collector of FIG. 1 separated from each other; FIG.

3 is an exploded perspective view of FIG. 1;

4 is a cross-sectional view of the vacuum cleaner of FIG. 1.

5 is an exploded perspective view of an embodiment of a motor chamber according to the present invention.

6 is a perspective view of a motor chamber according to the present invention.

7 is a graph showing the suction work rate and the suction efficiency of the vacuum cleaner according to the exhaust area ratio of the exhaust part formed in the motor chamber of FIG.

Figure 8a is a diagram showing the acoustic power according to the frequency corresponding to the noise generated in the vacuum cleaner of Figure 1 in an analog graph.

Figure 8b is a bar graph of the sound power according to the frequency for the noise generated in the vacuum cleaner of Figure 1;

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

100: cleaner body 130: motor

131: motor inlet 200: dust collector

250: dust collector handle 310: auxiliary chamber housing

320: chamber housing 321: motor installation

323: exhaust 330: chamber cover

331: first chamber cover 333: second chamber cover

The present invention relates to a vacuum cleaner, and more particularly, to a motor chamber of a vacuum cleaner that can reduce the noise by improving the structure.

In general, a vacuum cleaner includes a suction nozzle for suctioning foreign substances such as dust accumulated on the floor, a cleaner main body having a dust collecting device for separating and collecting foreign substances, and a connection pipe for guiding foreign substances sucked from the suction nozzle to the cleaner main body. It is configured to include.

The cleaner main body is provided with an air suction device for forcibly flowing the incoming air, and a predetermined position of the cleaner main body is provided with a dust collecting unit accommodating unit for accommodating a dust collecting unit.

In addition, the cleaner body is provided with a cleaner handle that can carry the cleaner body. One driving wheel is provided at each of both rear sides of the cleaner body, and a caster of a rotating material for changing the direction of the cleaner body is provided at a front surface of the bottom of the cleaner body.

Briefly looking at the operation of the vacuum cleaner configured as described above are as follows.

First, when the operation button for operating the vacuum cleaner is pressed, air containing foreign matter is sucked through the suction nozzle, and the sucked air is sucked into the cleaner body through the main body suction port. Air passing through the main body suction port flows into the dust collector, and foreign matter is primarily separated from the dust collector. Next, the air from which the foreign matter is first separated from the dust collector is moved to the exhaust chamber via the air suction device, and the foreign matter is filtered again from the exhaust chamber.

The vacuum cleaner is always accompanied by noise, which is generated by the air suction device, that is, the motor. A motor that rotates at high speed to force air is a major source of noise. In particular, the BPF (Blade Passage Frequency) noise caused by the fan is a noise that is very unpleasant to the human ear and causes complaints of the cleaner user. In addition, the flow noise generated by the flow of high speed air is one of the main noises of the vacuum cleaner.

However, the conventional vacuum cleaner did not have a separate noise reduction structure for reducing the noise generated by the motor.

Therefore, it was not possible to resolve the complaints of the vacuum cleaner users, thereby lowering the reliability of the product.

In addition, the conventional vacuum cleaner adopts a method of simply reducing the suction power of the vacuum cleaner in order to reduce noise, which has a problem of lowering the performance of the vacuum cleaner.

The present invention is to solve the above problems, an object of the present invention is to provide a vacuum chamber motor chamber that can reduce the noise generated by the motor of the vacuum cleaner.

It is another object of the present invention to provide a vacuum chamber motor chamber capable of reducing noise generated in a vacuum cleaner while maintaining a constant suction rate of the vacuum cleaner.

In order to achieve the above object, the present invention is a chamber housing having a motor installation unit is installed, the fan-motor assembly for sucking and forced air flow and the exhaust unit through which the air is discharged through the motor, and an upper portion of the chamber housing And a chamber cover having a chamber inlet through which air is introduced into the chamber housing, wherein an exhaust area of the exhaust unit is determined according to a frequency of noise to be reduced by a user. To provide.

The exhaust area of the exhaust part is preferably set at a ratio of 7% to 27% of the surface area occupied by the outer wall of the chamber housing.

The ratio of the exhaust area occupied by the exhaust part in the chamber housing is preferably set when the frequency of the noise is 800 Hz to 10 KHz.

Preferably, the ratio of the exhaust area of the exhaust part is determined in a state in which the suction work rate and the suction efficiency of the motor provided in the fan-motor assembly have values within respective allowable ranges.

Preferably, the exhaust part has a lattice shape and is formed on an outer wall of the chamber housing.

The motor chamber of the vacuum cleaner is preferably formed inside the chamber housing, and further comprises an auxiliary chamber housing for directly receiving the motor.

Between the chamber housing and the auxiliary chamber housing is preferably provided with a sound absorbing material that absorbs the noise generated by the motor.

The chamber cover is preferably configured to include a first chamber cover for accommodating the upper portion of the motor and a second chamber cover for fixing the first chamber cover.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the vacuum cleaner according to the present invention.

1 to 3, the structure of the vacuum cleaner according to the present invention will be described.

The vacuum cleaner according to the present invention moves along the floor to be cleaned while suction nozzles (not shown) for sucking air containing foreign substances, the cleaner body 100 provided separately from the suction nozzle, and the suction nozzle and the cleaner And a connecting pipe (not shown) which connects the main body 100 to each other and guides the air sucked from the suction nozzle to the cleaner main body 100.

Here, a nozzle suction port (not shown) of a predetermined size is formed at the bottom of the suction nozzle, and foreign matter accumulated on the bottom is sucked into the cleaner body together with air.

The front part of the cleaner main body is provided with a main body suction opening 162 communicated with the suction nozzle, the air flows into the cleaner body, the exhaust chamber 140 is discharged in communication with the outside on the side of the cleaner body It is provided.

A cleaner handle 161 is provided at an upper end portion of the cleaner body to carry the cleaner body, and wheels 110 are disposed at both rear sides of the cleaner body 100 to smoothly move the bottom surface of the cleaner body 100. Are rotatably mounted respectively. A caster (not shown) of rotating material is connected to the bottom front portion of the cleaner body 100 to change the direction of the cleaner body 100.

In addition, the dust collector 200 is detachably mounted to the rear portion of the cleaner body 100. The dust collector 200 functions to separate and collect the foreign matter from the air sucked from the suction nozzle. The dust collecting device includes a cylindrical dust collecting container 210, a dust collecting container cover 230 installed on the upper portion of the dust collecting container, and a dust collecting device handle 250 provided to carry the dust collecting device.

In addition, the inside of the cleaner body 100 is provided with an electric unit (not shown) for controlling the vacuum cleaner, and a fan-motor assembly 130 for suctioning and forcibly flowing air into the cleaner body.

The fan-motor assembly 130 is accommodated in a cylindrical motor chamber, and the motor chamber is installed in the lower case 120 of the cleaner body.

A side of the motor chamber is provided with an exhaust chamber 140 through which air through the motor chamber is discharged. The exhaust chamber 140 is provided with an exhaust filter (143 of FIG. 4) for filtering out foreign substances contained in the air again before the air passing through the motor chamber is discharged to the outside. The exhaust filter preferably uses a HEPA filter for filtering fine dust.

The cord reel 150 is installed at the rear of the motor chamber. The cord reel 150 functions to wind and store a connection cord provided to supply power to the cleaner body. In addition, the central axis of the cord reel is perpendicular to the ground, and one side of the cord reel is provided with a cord reel button 151 for controlling the operation of the cord reel.

4 to 6, the structure of the motor chamber in which the fan-motor assembly is installed will be described.

The motor chamber installed inside the cleaner body includes an auxiliary chamber housing 310 in which the fan-motor assembly 130 is directly received, a chamber housing 320 in which the auxiliary chamber housing 310 is accommodated, and an upper portion of the chamber housing. It is configured to include a chamber cover 330 is installed.

The auxiliary chamber housing 310 is a cylindrical container providing a space in which the fan-motor assembly 130 is directly received, and the auxiliary chamber housing 310 is accommodated in the chamber housing 320. An insertion hole 311 is formed at the bottom of the auxiliary chamber housing in which the protrusion of the bottom surface of the motor is inserted.

A first sound absorbing material 343 is installed on an outer wall of the auxiliary chamber housing 310 to absorb vibration generated by the fan-motor assembly 130. In particular, the first sound absorbing material 343 is installed to surround the entire outer wall of the auxiliary chamber housing, in order to minimize the transmission of vibration by the motor to the outside.

The bottom surface of the chamber housing 320 is recessed to form a motor installation unit 321 in which a fan-motor assembly 130 for sucking and forcibly flowing air is installed. The motor installation unit 321 is preferably installed at the center of the bottom surface of the chamber housing. This is to reduce the vibration of the chamber housing by minimizing the imbalance of the force transmitted to the chamber housing 320 by the vibration of the fan-motor assembly 130.

An exhaust portion 323 through which the air passing through the fan-motor assembly 130 is discharged is formed on the outer wall of the chamber housing. The exhaust part 323 has a lattice shape, and the exhaust area of the exhaust part is determined according to a frequency of noise that the user wants to reduce.

For example, as shown in FIG. 7, when the frequency of the noise to be reduced is 800 Hz to 10 KHz, the exhaust area ratio of the exhaust part is preferably set at a ratio of 7 percent (%) to 27 percent (%). Do.

The exhaust area ratio of the exhaust unit represents the ratio of the exhaust area of the exhaust unit where air is actually discharged to the area of the exhaust unit formed on the entire outer wall of the chamber housing in percentage. Here, the ratio of the exhaust area ratio to 100 percent means that all of the lattice-shaped exhaust parts formed on the entire outer wall of the chamber housing are open.

 On the other hand, the chamber housing 320 installed in the lower portion of the cleaner body is connected to the exhaust chamber 140. That is, the air discharged through the exhaust unit 323 of the chamber housing is discharged to the outside via the exhaust filter 143 installed in the exhaust chamber 140.

In addition, a second sound absorbing material (not shown) is installed between the auxiliary chamber housing 310 and the chamber housing 320 to absorb the noise generated by the fan-motor assembly 130. That is, the second sound absorbing material (not shown) is installed in front of the exhaust portion before the air is discharged to the exhaust chamber 140 through the exhaust portion 323. As the sound absorbing material, not only a porous material but also a flexible material, a porous plate material, and a plate material may be used.

The chamber cover 330 includes a first chamber cover 333 installed on an upper portion of the fan-motor assembly and a second chamber cover 331 provided on an upper portion of the first chamber cover.

The first chamber cover 333 serves to prevent vibration of the upper part of the fan-motor assembly. The first chamber cover 333 has a chamber inlet 333a corresponding to the shape of the upper portion of the fan-motor assembly, and the upper portion of the fan-motor assembly is inserted into the chamber inlet 333a. The chamber inlet 333a is formed at the center of the first chamber cover 333, and serves as a passage for allowing air discharged from the dust collector of the vacuum cleaner to flow into the motor inlet 131 formed in the motor.

The second chamber cover 331 serves to fix the first chamber cover 333 to the cleaner body. A fastening groove 331a having a predetermined shape is formed at an edge of the second chamber cover 331, and the fastening groove 331a is coupled to the cleaner body by a predetermined fastening member. Of course, the fastening boss 171 corresponding to the fastening groove 331a is formed in the cleaner body.

On the other hand, inside the upper case (160 of FIG. 3) forming the outer shape of the cleaner body is formed a connection flow path (163 of FIG. 3) for guiding the flow of air from the dust collector 200 to the motor chamber.

An upper chamber cover 340 formed integrally with the upper case is provided at the end of the connection channel. The upper chamber cover is installed on the upper portion of the motor chamber, and has a shape and size corresponding to the shape of the upper portion of the motor chamber. That is, the lower end of the upper chamber cover is configured to be inserted into the chamber inlet 333a formed in the chamber cover.

Referring to Figure 7, a graph of the suction work rate and the suction efficiency according to the exhaust area ratio of the exhaust section will be described.

The unit for measuring noise uses sound pressure and sound power, which means the emissivity of sound energy per unit time, and the sound pressure means the pressure generated by sound waves emitted by sound energy.

In general, the sound pressure measured using a microphone depends on the distance from the sound source, the acoustic environment in which sound waves exist, the size of the room and the degree of sound absorption on the wall. On the other hand, acoustic power is almost independent of the surrounding environment and corresponds to a unique means of expressing the loudness of a sound source.

In addition, the suction work rate in the vacuum cleaner indicates the intensity of sucking dust, and the unit of suction work rate is watt (W). That is, the suction work rate represents the output of the motor that sucks air. The suction work rate corresponds to one index indicating the performance of the vacuum cleaner, and the larger the suction work rate, the better the dust collection performance. Since the unit of the watt is commonly used in the art to which the present invention belongs, a detailed description thereof will be omitted.

In addition, the suction efficiency means the suction power of the vacuum cleaner relative to the power consumption used in the vacuum cleaner. Similarly, the suction efficiency is an index indicating the dust collecting performance of the vacuum cleaner, that is, the motor performance.

In order to determine the noise level according to the exhaust area ratio of the exhaust section, first, the suction work rate, the suction efficiency, and the acoustic power are measured when the exhaust area ratio of the exhaust section is 100 percent (%). Thereafter, the suction work rate, suction efficiency, and acoustic power are measured while gradually reducing the exhaust area ratio of the exhaust part.

According to FIG. 7, when the exhaust area of the exhaust part is 100 percent, the suction work rate has a value of about 470.5 W, and the suction efficiency has a value of about 35.3 percent. In addition, when the exhaust area ratio is 27 percent (%), the suction work rate has a value of about 471 W, and the suction efficiency has a value of about 35.5 percent (%). In addition, when the exhaust area ratio is 7%, the suction work rate is about 469W and the suction efficiency is about 35.1%.

On the other hand, the acoustic power when the exhaust area ratio is 100 percent (%) has an average value of 4 decibels (dB) larger than the acoustic power when the exhaust area is between 7 percent (%) and 27 percent (%). Here, the decibel (dB) is a unit used to display the intensity of the sound compared to the standard sound (標準音) and corresponds to the unit commonly used in the art. In general, when the acoustic power generated from the two noise sources has a difference of 3 decibels (dB), the intensity of sound felt by a real person has a difference of twice.

In addition, the allowable range of the suction work rate corresponds to an error of ± 1.5 W based on the case where the exhaust area ratio is 100 percent (%). The allowable range of the suction efficiency corresponds to an error of ± 0.3% based on the case where the exhaust area ratio is 100 percent (%). Therefore, when the suction work rate and the suction efficiency is within the allowable range, it means that the suction work rate and the suction efficiency are maintained at a constant level.

 As a result, the suction area ratio and the suction efficiency of the vacuum cleaner are maintained at a constant level, and the exhaust area ratio is 100 percent (%) than the exhaust area ratio is 7 percent (27 percent) to 27 percent (%). It can be seen that the noise level is more than twice.

8A shows an analog graph of all acoustic powers according to frequency, and 8B shows a bar graph of acoustic powers according to frequency. Referring to FIGS. 8A and 8B, the acoustic powers when the exhaust area ratio is 100 percent (%) and the 25 percent (%) are as follows.

It can be seen that the acoustic power has a different value depending on the frequency, and has a particularly high acoustic power in a region where the frequency has a value between 800 Hz and 10 KHz. If the noise is generally in the frequency domain with high acoustic power, the noise in other frequency domains is relatively ignored. Therefore, in order to reduce noise, it is desirable to reduce the acoustic power of sound waves in the frequency domain having high acoustic power.

First, when the exhaust area ratio is 100 percent (%) and the exhaust area ratio is 25 percent (%), in the case of the exhaust area ratio is 100 percent (%) in most frequency domains, the acoustic power is high. According to the experimental results, when the frequency range is 800Hz to 10KHz, the average acoustic power of the two cases differs by about 4 decibels (dB). In other words, a 25 percent (%) exhaust area ratio is much more effective at reducing noise.

In the present embodiment, the case in which the chamber housing is cylindrical has been described, but the shape of the chamber housing may be determined according to the shape of the portion in which the chamber housing is installed. For example, the shape of the chamber housing may have a shape of a polygonal column including a square pillar.

The present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications without departing from the spirit of the present invention, and such modifications are within the scope of the present invention.

The effects on the motor chamber of the vacuum cleaner according to the present invention described above are as follows.

First, according to the present invention, by controlling the exhaust area of the exhaust portion formed in the motor chamber there is an advantage that can reduce the noise of a specific frequency generated in the vacuum cleaner.

Second, by controlling the exhaust area of the exhaust portion there is an advantage that can reduce the noise generated in the vacuum cleaner while maintaining the suction work rate and suction efficiency of the vacuum cleaner at a constant level.

Third, there is an advantage that the noise generated by the motor can be effectively prevented from being transmitted to the outside by installing the auxiliary chamber housing that directly receives the fan-motor assembly and the chamber housing that accommodates the auxiliary chamber housing.

Fourth, by reducing the noise generated in the vacuum cleaner can solve the user's complaints, there is an advantage that can increase the reliability of the product.

Claims (8)

A chamber housing having a motor installation unit on which a fan-motor assembly for sucking and forced air flow is installed, and an exhaust unit through which air via the fan-motor assembly is discharged; And A chamber cover having a chamber inlet through which air is introduced into the chamber housing, the exhaust area of the exhaust unit being determined according to a frequency of noise to be reduced by a user; The motor chamber of the vacuum cleaner. The method of claim 1, The exhaust area of the exhaust part is set at a ratio of 7% to 27% of the surface area occupied by the outer wall of the chamber housing. The method of claim 2, The ratio of the exhaust area occupied by the exhaust part in the chamber housing is set when the frequency of the noise is 800Hz ~ 10KHz motor chamber of the vacuum cleaner. The method according to claim 2 or 3, The ratio of the exhaust area of the exhaust unit is a motor chamber of the vacuum cleaner, characterized in that the suction work rate and the suction efficiency of the motor provided in the fan-motor assembly are determined in a value within each allowable range. The method of claim 1, The exhaust chamber has a lattice shape, and the motor chamber of the vacuum cleaner, characterized in that formed on the outer wall of the chamber housing. The method of claim 5, And an auxiliary chamber housing formed inside the chamber housing and directly receiving the fan-motor assembly. The method of claim 6, Motor chamber of the vacuum cleaner, characterized in that the sound absorbing material for absorbing the noise generated by the fan-motor assembly is installed between the chamber housing and the auxiliary chamber housing. The method of claim 7, wherein The chamber cover comprises a first chamber cover for accommodating an upper portion of the fan-motor assembly and a second chamber cover for fixing the first chamber cover.

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