JP2010178768A - Electric vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric vacuum cleaner which can reduce aerodynamic sound which is generated at an exhaust outlet of its cleaner body. <P>SOLUTION: The electric vacuum cleaner includes a dust collection chamber 4 which is communicated with a suction inlet 3 of the cleaner body 2, an air blowing chamber 6 which communicates between the dust collection chamber 4 and the exhaust outlet 5, and an electric blower 7 which is arranged inside the air blowing chamber 6. The exhaust outlet 5 is provided with a porous frame 8 which has several pores in such a way that small pores 8b through which exhaust air flows at a low speed are arranged around a large pore 8a through which exhaust air flows at a high speed. A rectification filter 9a is arranged in the upstream of the exhaust air of the porous frame 8 and spun fabric 10a covers the downstream of the exhaust air of the porous frame 8. This construction makes a change in speed of the exhaust air flow from the center toward the surrounding part of the exhaust outlet 5 of the cleaner body 2 slower, suppresses the generation of turbulent flows and substantially reduces the aerodynamic sound. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner capable of reducing aerodynamic noise generated at an exhaust port of a cleaner body.

  Conventionally, this type of vacuum cleaner uses a wind direction guide plate to change the direction of exhaust from the main body of the vacuum cleaner to suppress noise transmitted to the user, or exhausts with a spinning cloth at the exhaust port of the main body of the vacuum cleaner. The thing which carried out the dispersion | distribution exhaust by covering the downstream side is known (for example, refer patent document 1, 2).

  FIG. 18 is a diagram illustrating a cross-sectional configuration of a conventional vacuum cleaner described in Patent Document 1. A vacuum cleaner body 25 having a dust collection chamber 22 in which the dust collection filter 21 is disposed and a motor chamber 24 in which the fan motor 23 is disposed, and exhaust air from the fan motor 23 on the rear surface of the vacuum cleaner body 25 to the outside. An exhaust outlet 26 formed so as to be discharged is provided, and the exhaust outlet 26 is provided with a wind direction guide plate 27 that is configured to exhaust the exhaust from the upper part downward and the exhaust from the lower part upward. Machine 28 is disclosed.

FIG. 19 is a diagram illustrating a cross-sectional configuration of a conventional vacuum cleaner described in Patent Document 2, and FIG. 20 is an exploded view illustrating a configuration of an exhaust port 30 of the vacuum cleaner. As shown in FIG. 19 and FIG. 20, in a cleaner main body 31 having an electric blower 29 that emits suction air for sucking dust and having an exhaust port 30 that discharges exhaust discharged from the electric blower 29 to the atmosphere. A frame member 33 that is detachably attached to the exhaust port 30 and that covers the entire exhaust downstream side with a spun cloth 32, is provided with filters 34 and 35 on the upstream side and downstream side of the frame member 33, and the outer shell portion of the exhaust port 30 A vacuum cleaner 36 in which is covered with a spun cloth 32 is disclosed.
JP-A-4-218126 JP 2003-19091 A

  However, in the configuration of the conventional vacuum cleaner described in Patent Document 1, the flow of exhaust from the fan motor 23 is determined according to the ventilation pressure loss of the exhaust passage in the motor chamber 24 and the exhaust outlet 26. The exhaust flow velocity in the engine varies depending on the location, and there is a problem that a large speed change occurs from the exhaust outlet 26 to the peripheral portion, and aerodynamic noise due to turbulent flow is generated.

  Furthermore, in the configuration of the conventional vacuum cleaner described in Patent Document 2, the shape and arrangement of the holes of the exhaust port 30 are only described from the viewpoint of ease of mold processing and ensuring the strength. Have basically the same shape of holes. For this reason, the distribution of the exhaust flow velocity in the vicinity of the exhaust port 30 is in a state as shown in FIG.

  FIG. 21 is a schematic diagram showing a state in which the filters 34 and 35, the frame member 33, and the spun cloth 32 are mounted in the exhaust port 30. The magnitude of the exhaust flow velocity is indicated by a broken line arrow, and the distribution of the exhaust flow velocity is indicated by a solid line. This is entered, and the state of occurrence of turbulence 36 is indicated by a solid line arrow. As shown in the figure, the speed change of the exhaust flow velocity increases from the exhaust port 30 to the outer shell 31a of the vacuum cleaner body 31 around the exhaust port 30, and the aerodynamic noise caused by the turbulent flow 36 is generated. Had.

The present invention solves the above-mentioned conventional problems, and provides a vacuum cleaner that can reduce the aerodynamic noise generated at the exhaust port by gradual speed change from the exhaust port to the periphery of the cleaner body. The purpose is to do.

  In order to solve the above-described conventional problems, an electric vacuum cleaner according to the present invention includes a dust collection chamber communicating with an intake port of a vacuum cleaner body, and an exhaust port provided in an outer wall of the dust collection chamber and the cleaner body. An exhaust port having a plurality of holes each having a small exhaust flow rate around a hole having a large exhaust flow rate, the air supply chamber having an air flow chamber communicating with each other and an electric blower installed in the blower chamber; Provided on the exhaust upstream side of the porous frame body, and the exhaust downstream side of the porous frame body is covered with a spun cloth.

  As a result, the exhaust discharged from the electric blower is flowed by the rectifying filter to reduce the turbulent flow component and flow almost uniformly to the porous frame. In the porous frame, around the exhaust having a large flow velocity. Since the exhaust at a low flow velocity flows through the eyes of the spinning cloth and is released from the cleaner body, the speed change from the exhaust port of the cleaner body to the surrounding area becomes gradual, suppressing the occurrence of turbulence. As a result, aerodynamic noise caused by turbulent flow is greatly reduced.

  The electric vacuum cleaner of the present invention can reduce aerodynamic noise caused by turbulent flow by gradual speed change from the exhaust port of the vacuum cleaner main body to the peripheral portion.

  The first invention includes a dust collection chamber that communicates with an intake port of a cleaner body, a blower chamber that communicates between the dust collection chamber and an exhaust port provided in an outline of the cleaner body, and the blower chamber. A perforated frame body having a plurality of holes in which holes having a small exhaust flow rate are arranged around a hole having a large exhaust flow rate is provided at the exhaust port, and on the upstream side of the exhaust of the porous frame body. The vacuum cleaner is provided with a rectifying filter and the exhaust downstream side of the porous frame is covered with a spun cloth.

  As a result, the exhaust discharged from the electric blower is flowed by the rectifying filter to reduce the turbulent flow component and flow almost uniformly to the porous frame. In the porous frame, around the exhaust having a large flow velocity. Since the exhaust at a low flow velocity flows through the eyes of the spinning cloth and is discharged from the cleaner body, the speed change from the exhaust port of the cleaner body to the peripheral part becomes gradual, and the generation of turbulent flow is suppressed. Therefore, the generation of aerodynamic sound due to turbulent flow is greatly reduced.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the perforated frame is formed by alternately arranging holes having a high exhaust flow rate and holes having a low exhaust flow rate, so that the periphery of the perforated frame body from the exhaust port of the cleaner body has a small hole shape. Since the exhaust area can be increased while the speed change over the portion is moderated, the generation of aerodynamic noise can be reduced without reducing the suction force.

  According to a third aspect of the invention, in particular, in the first aspect of the invention, the porous frame includes a plurality of holes having a large exhaust flow rate surrounded by a plurality of holes having a low exhaust flow rate, and the plurality of the plurality of holes surrounded by the plurality are arranged on the outer peripheral side. By arranging the exhaust flow rate to be small, the exhaust flow rate gradually decreases from the center of the porous frame toward the outer periphery, and the speed change from the central part to the peripheral part of the exhaust port can be further moderated. Therefore, the generation of aerodynamic noise can be greatly reduced.

  According to a fourth aspect of the present invention, in particular, in any one of the first to third aspects, the porous frame is configured so that the hole having a substantially small diameter surrounds the hole having a large diameter. By changing the size and adjusting the ventilation pressure loss, the speed change from the central part to the peripheral part of the exhaust port can be made more gradual, and the vacuum cleaner body with less aerodynamic noise can be easily configured .

According to a fifth aspect of the invention, in particular, in the fourth aspect of the invention, the perforated frame body has a hole with a substantially smaller diameter that surrounds the hole with a larger diameter and is deformed into an annular shape. Thus, the speed change from the central part to the peripheral part of the exhaust port can be further moderated, and the exhaust port of the cleaner body with less aerodynamic noise can be easily configured.

  According to a sixth aspect of the invention, in particular, in the fourth aspect of the invention, the porous frame has a plurality of holes each having a substantially small diameter so as to surround the large diameter holes. The speed change over the part can be made more gradual, and the exhaust port of the cleaner body with less aerodynamic noise can be easily configured.

  In the seventh invention, in particular, in the plurality of holes of any one of the first to sixth inventions, the hole length is shortened to increase the exhaust flow velocity, and the hole length is increased to increase the exhaust velocity. By making it small, the speed change from the central part to the peripheral part of the exhaust port can be made more gradual, and the exhaust port of the cleaner body with less aerodynamic noise can be easily configured. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a cross-sectional configuration of the electric vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is an exploded view showing the configuration of the exhaust port of the vacuum cleaner, and FIG. FIG. 4 is a schematic diagram showing an exhaust flow velocity distribution of the vacuum cleaner.

  1 and 2, the vacuum cleaner 1 includes a dust collection chamber 4 that communicates with the intake port 3 of the cleaner body 2, and a blower chamber 6 that communicates with the dust collection chamber 4 and the exhaust port 5 of the cleaner body 2. An air blower 6 installed in the blower chamber 6 is provided, and a porous frame 8 having a plurality of holes made by resin molding is fitted and fixed in the exhaust port 5 of the cleaner body in a detachable state. Yes.

  Moreover, the electric blower 7 is covered with a soundproof case 11 using a flame retardant resin, and front and rear are supported by vibration proof rubbers 12a and 12b. A dust collection bag 13 for filtering and separating dust is installed in the dust collection chamber 4. Although not shown, a hose and an extension pipe are sequentially connected to the air inlet 3 of the cleaner body 2, and a nozzle for sucking dust on the floor is attached to the tip of the extension pipe.

  As shown in FIG. 3, the porous frame 8 has two large and small round holes alternately arranged in a state where the small diameter hole 8b surrounds the large diameter hole 8a. 9a is bonded and the spun cloth 10a is welded to the entire exhaust downstream side.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, by driving the electric blower 7, the inside of the dust collection chamber 4 is in a negative pressure state, and an air flow flows into the dust collection chamber 4 from the intake port 3 of the cleaner body 2. The clean air stream filtered from the dust collection bag 13 and separated from the dust is sucked into the electric blower 7 in the blower chamber 6 and passes through the electric blower 7, and then the air filter 9a, the porous frame 8, and It flows in the order of the spun cloth 10a and is discharged from the exhaust port 5 of the cleaner body 2.

  Since the flow state of the exhaust discharged from the electric blower 7 is determined according to the direction discharged from the electric blower 7 and the flow path formed by the soundproof case 11 and the blower chamber 6, the exhaust of the cleaner body 2 is exhausted. A large turbulent flow component flows toward the mouth 5. However, when passing through the air filter 9a, the flow of the exhaust is adjusted by the pores of the air filter 9a, the turbulent flow component of the exhaust is reduced, and the exhaust of the electric blower 7 is almost uniform toward the porous frame body 8. It begins to flow.

  In general, the pressure loss when the airflow passes through the circular pipe is inversely proportional to the diameter of the circular pipe flow path. Therefore, in the porous frame 8, the large-diameter hole 8a has a smaller airflow pressure loss than the small-diameter hole 8b, and the exhaust gas flows out from the large-diameter hole 8a at a large flow velocity, and the large-diameter hole 8b has a large diameter. Exhaust gas having a smaller flow velocity than the diameter hole 8a flows out. Accordingly, the exhaust flow velocity distribution in the vicinity of the exhaust port 5 is as shown in FIG.

  FIG. 4 is a schematic diagram showing the distribution of the exhaust flow velocity generated with respect to the AA cross section in FIG. 3, the magnitude of the exhaust flow velocity is indicated by a broken line arrow, and the exhaust flow velocity distribution 37a is indicated by a solid line. The state of occurrence of 38a is indicated by a solid arrow.

  As shown in FIG. 4, in order to pass through the spun cloth 10a with a small flow rate of exhaust flowing around a large flow rate, from the central portion of the exhaust port 5 of the cleaner body 2 to the periphery of the exhaust port 5 (of the cleaner body 2). The speed change over the outer shell 2a) becomes gradual, the generation of turbulent flow is suppressed, and aerodynamic noise caused by turbulent flow is greatly reduced.

  As the fiber material of the spun cloth 10a, those using natural fibers or chemical fibers are known, but taking into consideration heat resistance and wear resistance, it is desirable to use synthetic fibers such as nylon and polyester. Nylon is excellent in abrasion resistance among synthetic fibers and has high resilience, so that it is a material resistant to deformation when it comes into contact with furniture during cleaning.

  Further, since polyester is excellent in heat resistance and light resistance and is a strong fiber, it is possible to prevent deformation and deterioration of the electric blower 7 due to exhaust heat. Furthermore, by applying antibacterial processing and anti-mold processing, it is possible to improve the durability of the product and at the same time clean unsanitary exhaust.

  Moreover, since the porous frame body 8 fitted and fixed to the exhaust port 5 of the cleaner body 2 is detachable, the air filter 9a and the spun cloth 10a can be easily attached to and detached from the exhaust port 5. Further, when the air filter 9a or the spun cloth 10a deteriorates over time, the porous frame body 8 with the air filter 9a and the spun cloth 10a is removed from the exhaust port 5 for maintenance or replacement for a long time. It can be used over a wide range.

  As described above, in the present embodiment, the porous frame body 8 in which round holes are arranged in the exhaust port 5 of the cleaner body 2 so that the small diameter hole 8b surrounds the large diameter hole 8a is detachable. The air filter 9a is bonded to the exhaust upstream side, and the spun cloth 10a is welded to the entire exhaust downstream side, so that aerodynamic noise generated at the exhaust port 5 of the cleaner body 2 can be greatly reduced. .

(Embodiment 2)
FIG. 5 is an exploded view showing the configuration of the exhaust port of the electric vacuum cleaner according to the second embodiment of the present invention, and FIG. 6 is a front view of the porous frame 14 provided at the exhaust port.

  As shown in FIGS. 5 and 6, the perforated frame body 14 is provided with a hole 14a having a maximum diameter at the center, and a plurality of holes 14b smaller than the diameter of the maximum hole 14a are arranged so as to surround the maximum hole 14a. A plurality of holes 14c smaller than the plurality of holes 14b are arranged so as to surround the outer peripheral side thereof. Further, a plurality of smaller holes 14d are arranged so as to surround the outer peripheral side thereof, and further, a plurality of small holes 14e are arranged so as to surround the outer peripheral side so as to surround the outer periphery of the hole having a large aperture. The small diameter holes surround the large diameter holes and are arranged in multiple layers.

  In this way, by arranging the plurality of holes so that the hole diameter gradually decreases from the center of the porous frame body 14 toward the outer peripheral side, the distribution of the exhaust flow velocity from the exhaust port 5 is as shown in FIG. Become.

  FIG. 7 is a schematic diagram showing the distribution of the exhaust flow velocity generated with respect to the BB cross section in FIG. 6, in which the configuration of the exhaust port of the vacuum cleaner is enlarged, and the magnitude of the exhaust flow velocity is indicated by a broken line arrow. The exhaust flow velocity distribution 37b is indicated by a solid line, and the generation state of the turbulent flow 38b is indicated by a solid arrow. As shown in the figure, the exhaust flow rate gradually decreases gradually from the central portion of the exhaust port 5 of the cleaner body 2 having the largest exhaust flow rate to the periphery of the exhaust port 5, and the speed change is further moderated. Therefore, the generation of the turbulent flow 38b is weakened, and the generation of aerodynamic sound can be greatly reduced.

(Embodiment 3)
FIG. 8 is an exploded view showing the configuration of the exhaust port of the vacuum cleaner according to the third embodiment of the present invention, and FIG. 9 is a front view of the porous frame of the vacuum cleaner.

  As shown in FIG. 8 and FIG. 9, the porous frame 15 has two holes 15a and 15b with the maximum diameter, and the holes surrounding the holes 15a and 15b with the maximum diameter are provided on the outer peripheral side as in the second embodiment. The exhaust flow velocity distribution as shown in FIG. 10 is obtained by arranging in multiples so as to gradually become smaller.

  FIG. 10 is a schematic diagram showing the distribution of the exhaust flow velocity generated with respect to the CC cross section in FIG. 9. The magnitude of the exhaust flow velocity is indicated by a broken line arrow, and the exhaust flow velocity distribution 37c is indicated by a solid line. The state of occurrence of 38c is indicated by a solid arrow.

  As shown in FIG. 10, the exhaust flow velocity at the locations corresponding to the holes 15a and 15b with the maximum diameter becomes the maximum, and the size of the exhaust flow velocity gradually increases toward the outer peripheral side around the holes 15a and 15b with the maximum diameter. The exhaust flow velocity between the holes 15a and 15b having the maximum diameter gradually changes in conjunction with the maximum exhaust flow velocity. And it is also possible to reduce significantly the ventilation pressure loss of the exhaust port 5 of the cleaner body 2 by doubling the exhaust area of the porous frame 15. Of course, the number is not limited to two, and three or more may be provided.

  In the present embodiment, the case where the porous frame body is produced by resin molding has been described. However, as in the modification shown in the exploded view of FIG. 11, the porous frame body 16 includes a porous plate 17 such as a punching metal. Needless to say, the support frames 18 may be formed individually, and the support frames 18 may be bonded and integrated to the porous plate 17 to be integrated.

(Embodiment 4)
Further, in the present embodiment, the description has been given using round holes having the same shape, but the present invention is not limited to round holes, and the shape of the holes may be modified.

  FIG. 12: is an exploded view which shows the structure of the exhaust port of the vacuum cleaner in the 4th Embodiment of this invention, and FIG. 13 is a front view of the porous frame of the same vacuum cleaner.

  As shown in FIGS. 12 and 13, the porous frame 19 has a substantially elliptical or track-like hole 19 a having a maximum diameter at the center, and the shape of the hole 19 a having the maximum diameter is formed around the hole 19 a. The deformed holes 19b and 19c that are substantially smaller than the maximum diameter hole 19a are formed, and the smaller holes 19d and 19e are formed on the outer peripheral side of the holes 19b and 19c. The hole is formed so that the equivalent diameter becomes substantially smaller as the distance increases.

The ventilation pressure loss changes depending on the equivalent diameter determined by the hole area and the circumferential length. Therefore, as shown in FIG. 13, the hole shape is adjusted to form holes having different equivalent diameters, and the hole 19a having the maximum diameter is moved to the outer peripheral side. Thus, the substantial hole diameter can be reduced, and an exhaust flow velocity distribution as shown in FIG. 14 can be obtained.

  FIG. 14 is a schematic diagram showing the exhaust flow velocity distribution generated with respect to the DD cross section in FIG. 13. The magnitude of the exhaust flow velocity is indicated by a broken line arrow, and the exhaust flow velocity distribution 37d is indicated by a solid line. The state of occurrence of 38d is indicated by a solid arrow.

  As shown in FIG. 14, the exhaust flow velocity distribution 37d shows a distribution in which the center of the hole 19a with the maximum diameter is the maximum, and the exhaust flow velocity gradually decreases toward the outer peripheral side. Generation of aerodynamic noise at the exhaust port 5 of the main body 2 can be reduced.

(Embodiment 5)
FIG. 15 is an exploded view showing the configuration of the electric blower 7 according to Embodiment 5 of the present invention, and FIG. 16 is a front view of a porous frame provided at the exhaust port. Note that the same elements as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 15 and 16, the porous frame body 20 of the cleaner body 2 has a plurality of rectangular holes, and the substantial thickness of the porous frame body 20 is different for each rectangular hole. A plurality of holes are arranged so that a long hole 20b surrounds a short hole 20a. Specifically, in the state where the sizes of the openings on the downstream side of the rectangular holes 20a and 20b are the same, a step is provided in the hole of the rectangular hole 20a to shorten the substantial hole length, and the hole of the hole 20b. By not providing a step in the inside, the length of the hole 20b is increased, and the substantial thickness of the porous frame 20 is varied.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, by driving the electric blower 7, the exhaust discharged from the electric blower 7 exits the soundproof case 11, reaches the air filter 9f, is rectified by the air filter 9f, and flows almost uniformly into the porous frame 20. Come on. The pressure loss when the airflow passes through the rectangular pipe is proportional to the length of the rectangular pipe flow path. Therefore, the air pressure loss is smaller in the hole 20a having a shorter length, and the exhaust gas flows at a higher flow velocity. Exhaust gas flows at a low flow rate through the long holes 20b.

  The exhaust gas that has passed through the porous frame 20 passes through the spinning cloth 10f and is released to the outside of the cleaner body 2, and the speed change of the exhaust flow velocity that occurs when it passes through the porous frame 20 is relaxed by the spinning cloth 10f. The exhaust speed from the exhaust port 5 is as shown in FIG.

  FIG. 17 is a schematic diagram showing the exhaust flow velocity distribution in the cross section of FIG. 16E-E. The magnitude of the exhaust flow velocity is indicated by a broken line arrow, the exhaust flow velocity distribution 37d is indicated by a solid line, and the generation state of the turbulent flow 38d is indicated by a solid line. Shown with arrows. As shown in the figure, since the speed change from the exhaust port 5 to the periphery of the exhaust port 5 of the cleaner body 2 is alleviated and the generation of turbulent flow is suppressed, aerodynamic noise caused by turbulent flow is reduced. .

  As described above, in the fifth embodiment, by arranging the rectangular holes having different thicknesses in the exhaust port 5 of the cleaner body 2, the speed between the exhaust port 5 of the cleaner body 2 and the surrounding environment. The change is alleviated, and aerodynamic noise generated at the exhaust port 5 of the cleaner body 2 can be greatly reduced.

  In addition, the structure of each Embodiment 1-5 mentioned above is not limited to this, It can implement by combining suitably as needed.

As described above, the electric vacuum cleaner according to the present invention suppresses the occurrence of turbulent flow by reducing the speed change from the central part to the peripheral part of the exhaust port of the vacuum cleaner body, thereby greatly increasing the aerodynamic sound. Since it can be reduced, it can be applied to household vacuum cleaners as well as home appliances.

Schematic showing the cross-sectional structure of the vacuum cleaner in the 1st Embodiment of this invention Exploded view showing the structure of the outlet of the vacuum cleaner Front view of the perforated frame of the vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of the vacuum cleaner The exploded view showing the structure of the exhaust port of the vacuum cleaner in the 2nd Embodiment of this invention Front view of the perforated frame of the vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of the vacuum cleaner The exploded view showing the structure of the exhaust port of the vacuum cleaner in the 3rd Embodiment of this invention Front view of the perforated frame of the vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of the vacuum cleaner The exploded view showing the composition of the exhaust port of the vacuum cleaner in the modification of the present invention The exploded view showing the structure of the exhaust port of the vacuum cleaner in the 4th Embodiment of this invention Front view of the perforated frame of the vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of the vacuum cleaner The exploded view of the exhaust port of the vacuum cleaner in the 5th Embodiment of this invention Front view of the perforated frame of the vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of the vacuum cleaner Cross-sectional view of a conventional vacuum cleaner Cross-sectional view of a conventional vacuum cleaner Exploded view showing the configuration of the exhaust port of a conventional vacuum cleaner Schematic diagram showing the exhaust flow velocity distribution of a conventional vacuum cleaner

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner 2 Vacuum cleaner main body 3 Intake port 4 Dust collection chamber 5 Exhaust port 6 Blower chamber 7 Electric blower 8 Porous frame 9a, 9b Air filter (rectifying filter)
10a, 10b Spinning cloth 14, 15, 16, 19 Porous frame

Claims (7)

A dust collection chamber communicating with the intake port of the vacuum cleaner main body, a blower chamber communicating between the dust collection chamber and an exhaust port provided in the outer wall of the vacuum cleaner main body, and an electric blower provided in the blower chamber Provided with a porous frame body having a plurality of holes in which holes with a low exhaust flow rate are arranged around a hole with a high exhaust flow rate, and provided with a rectifying filter on the exhaust upstream side of the porous frame body, A vacuum cleaner in which the exhaust downstream side of the porous frame is covered with a spun cloth. The vacuum cleaner according to claim 1, wherein the porous frame has alternately arranged holes having a high exhaust flow rate and holes having a low exhaust flow rate. The porous frame body is arranged such that a plurality of holes having a large exhaust flow velocity are surrounded by a plurality of holes having a small exhaust flow velocity, and the exhaust flow velocity becomes smaller as the plurality of holes surrounded by the plurality are located on the outer peripheral side. Electric vacuum cleaner. The vacuum frame according to any one of claims 1 to 3, wherein the porous frame is configured so that a hole having a substantially small diameter surrounds a hole having a large diameter. The vacuum cleaner according to claim 4, wherein the porous frame body is deformed into an annular shape so that a hole having a substantially small diameter surrounds the hole having a large diameter. The vacuum cleaner according to claim 4, wherein the porous frame body has a plurality of holes each having a substantially small diameter so as to surround the holes having a large diameter. The electricity according to any one of claims 1 to 6, wherein the plurality of holes are configured such that the hole length is shortened to increase the exhaust flow velocity, and the hole length is increased to decrease the exhaust speed. Vacuum cleaner.

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