JP3746279B2 - Duct cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blow-off type duct cleaning device that removes dust on the inner surface of a duct, and more particularly to a duct cleaning device that can effectively clean the inside of a duct with a small air volume dust collector or the like.
[0002]
[Prior art]
Duct cleaning is performed by two procedures: an operation of separating dust attached to the inner surface of the duct from the duct and an operation of collecting the dust.
[0003]
As the former “work for separating dust from the duct”, as described in Patent Document 1 below, a method of flapping and knocking down the belt-like folds of a blow-off type cleaning tool, specifically, FIG. As shown in the figure, it is mainly composed of a frame 31, a large number of band-shaped folds 32, 32... Integrally formed on the rear end side of the frame 31, and a rope 33 that pulls the frame 31. The blown-up cleaning tool 30 thus inserted is inserted into the duct 34 and moved by operating the tow rope 33 while giving an air volume into the duct with a dust collector or the like, and the inner wall of the duct 34 is struck by the belt-like fold 32. A method of dropping dust, a method of sliding with a brush attached to a cleaning tool, a method of knocking down with a tube attached to the tip of the cleaning tool, and wind By Jo cleaning tool and a method of blowing off using a high-speed air stream flowing around.
[0004]
In addition, as the latter method of “collecting dust”, a method of extruding dust by air pressure and collecting dust with a filter attached to the duct opening, a method of collecting dust by suction with a dust collector attached to the duct Etc.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 3-44837 [Patent Document 2]
Japanese Patent Application Laid-Open No. 58-170584 [Patent Document 3]
JP 59-49887 A [0006]
[Problems to be solved by the invention]
In the case of the blow-off type cleaning tool, the cleaning tool uses a turbulent air generated naturally by the operation of the dust collector as a power source. However, due to the frictional resistance of the inner surface of the duct, the flow velocity at the center of the duct becomes faster and the pressure becomes lower as it approaches the center, so the swirling band folds tend to converge toward the center side, effectively eliminating the band folds There was a problem that the inner surface of the duct could not be contacted.
[0007]
In addition, since the speed of the wind that flows inside the duct by the dust collector must be faster than the speed of the air blow during normal air conditioning operation, a large dust collector that can generate a large air volume and high wind pressure is required. In reality, it is difficult to bring large and large equipment into the building, and many small dust collectors are carried in. However, since ducts are usually concealed within a narrow ceiling, it is often difficult to install small dust collectors at desired locations and to install a sufficient number of small dust collectors, so As a result, the dust collection capability is insufficient, and the required wind speed cannot be generated, resulting in the dust remaining inside the duct.
[0008]
In addition, the duct system has many bent parts that obstruct the cleaning work.Brush, tube, and balloon-shaped cleaning tools have a cleaning tool attached to the tip from the work port provided in the duct. Because it is a structure that pushes forward while pushing, it is necessary to attach a hard iron wire such as a piano wire to the air hose, so it is difficult to pass the cleaning tool by the outer wall on the outer peripheral side of the bent part of the duct as a barrier Become. In particular, it was impossible to pass through a portion where two or more bends continued.
[0009]
With regard to this point, in the case of the blow-off type cleaning tool, since the cleaning tool attached to the tip of the tow rope is structured to be sucked by the air flow generated by the dust collector, it can pass even at two or more bent portions. However, since these cleaning tools are supported by a soft string such as a rope, the inner wall of the duct inner periphery becomes the fulcrum of the string at the bent part of the duct, and the cleaning tool is biased toward the inner periphery of the duct. There is a problem that the outer peripheral side cannot be sufficiently cleaned.
[0010]
On the other hand, in the case of a cleaning tool in the form of a brush, tube or balloon, the operating range is limited, so the work range is short, and many work openings must be provided to insert the cleaning tool into the duct to be cleaned. There is a problem.
[0011]
Accordingly, the first problem of the present invention is to enable uniform cleaning of the inner surface of the duct without leaving dust in the duct even in a dust collector or the like having a small air volume, and to remove the belt-like folds of the blow-off type cleaning device from the duct. An object of the present invention is to provide a blow-off type duct cleaning device that is effectively brought into contact with the inner surface, that is, the capacity required of a dust collector or the like is reduced and a sufficient cleaning effect can be expected.
[0012]
Next, the second problem is to clean the duct evenly at the bent portion of the duct, so that the cleaning device can be positioned on the axial center of the duct without biasing to one side, and can be cleaned uniformly regardless of the inner or outer peripheral side. To provide an apparatus.
[0013]
[Means for Solving the Problems]
In order to solve the first problem, as the invention according to claim 1, the front and rear end faces are both opened , and a cylindrical body whose diameter is gradually enlarged from the front end side to the rear end side is formed, and in the circumferential direction at the rear side portion. A blowout type duct cleaning device main body in which a large number of band-like pleats are formed and a tow rope is connected to the front end via a string-like member, and the front end side is provided on the inner side of the blowout type duct cleaning device main body. Opened, substantially closed at the rear end side, and having an enlarged diameter portion whose diameter is gradually enlarged from the front end side to the rear end side, and conically closed from the middle maximum diameter portion to the rear end. Ri Do from an inner bag form a bag shape, a number of strip-like folds of the windsock type duct cleaning apparatus main body, the enlarged diameter portion corresponding position of the inner bag and starting, beyond an intermediate maximum diameter portion of the inner bag JP that extends to the rear end side Duct cleaning apparatus is provided to.
[0014]
In the invention according to the first aspect, an inner bag is separately provided on the inner side of the blow-off type cleaning device body. As a result, a static pressure difference is produced between the front end side position and the rear end side position of the duct cleaning device in the duct, and the gap between the duct and the duct cleaning device (around the duct cleaning device) due to the reduction in the cross section of the flow path. A high-speed airflow is generated. Therefore, as will be described later, even if the air volume is small, it is possible to use the high-speed airflow to flutter the band-like folds and effectively contact the inner wall of the duct, and reliably convey the dust to the rear side. It becomes possible to do.
[0015]
As the present invention according to claim 2, wherein the bag the windsock type duct cleaning apparatus a plurality of string-shaped member according to claim 1 Symbol mounting duct cleaning apparatus is supported via the one end of which is connected to the front end portion of the body Is provided.
[0016]
According to a third aspect of the present invention, there is provided the duct cleaning device according to any one of the first and second aspects, wherein the blowout type duct cleaning device main body and the inner bag have an outer shape substantially similar to the duct shape. The
[0017]
As a fourth aspect of the present invention, there is provided one or a plurality of string-like members that are provided with a connection ring at a connection side end portion of the tow rope, and are stretched over a front end opening surface of the blow-off type duct cleaning device body. The duct cleaning apparatus in any one of Claims 1-3 currently penetrated by the said ring for connection is provided.
[0018]
In the invention which concerns on the said Claim 4 , regarding the connection part structure of a tow rope and a cleaning apparatus main body, it was made to couple | bond via a connection ring so that the connection point of a tow rope could move freely. Therefore, even when the fulcrum of the towing line changes in the bent portion of the duct, the opening of the cleaning device main body can be oriented in the direction of the air flow, and the cleaning device main body can be localized on the axial center of the duct. The inner peripheral side and the outer peripheral side can be uniformly cleaned.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a duct cleaning device 1 according to the present invention, and FIG. 2 is an enlarged view of a main part of a ring 12 portion.
[0020]
The duct cleaning device 1 mainly includes a cylindrical blow-off type duct cleaning device main body 2 (hereinafter simply referred to as a cleaning device main body) provided with a number of strip-shaped folds 2b, 2b,. It is comprised from the inner bag 3 provided in the inside of the apparatus main body 2, and the tow rope 5 which pulls the said cleaning apparatus main body 2. As shown in FIG.
[0021]
The cleaning device main body 2 is composed of a front side cylinder portion 2A and a rear side belt-like fold portion 2B. The overall shape is a cylindrical body whose front and rear are both open, and has an outer shape whose diameter is gradually enlarged from the front end to the rear end. A large number of band-like folds 2b, 2b,... Are formed around the circumferential direction by cutting into a position of about 2/3. The shape of the cleaning device main body 2 is not necessarily matched to the duct shape, but is preferably substantially similar to the duct shape.
[0022]
As the material of the cleaning device main body 2, the belt-like folds 2b, 2b,... Repeatedly contact the inner wall of the duct during cleaning, and therefore, a material having a certain degree of wear resistance and sufficient flexibility is used. The material is not limited as long as it has such physical properties. For example, leather, soft vinyl chloride sheet, nylon tarpaulin, polyester tarpaulin, tarpaulin, chloroprene tarpaulin, etc. are covered with soft vinyl chloride or rubber on both sides. The ground, high-strength synthetic fibers such as nylon, polyester, and vinylon can be suitably used.
[0023]
In the above example, the band-like fold 2b is made of a material that is integral with the front-side cylinder part 2A. However, another member that becomes the band-like fold 2b is attached to the front-side cylinder part 2A by sewing, screws, or the like. But you can.
[0024]
An opening frame 2a is provided at the front end of the front side cylinder portion 2A in order to keep the shape of the cleaning device main body 2 in a predetermined shape, in the illustrated example, circular. The material of the opening frame 2a is a member that substantially supports the tow rope 5, a member that supports an inner bag 3 to be described later, and frequently contacts the inner wall of the duct during cleaning. From the above, a high-strength member that is difficult to bend and cracked, such as metal and hard vinyl chloride, is preferably used.
[0025]
As shown in FIG. 2, the opening frame 2 a is provided with a string-like member made up of connecting strings 4, 4 crossing in an X shape when viewed from the front, and at the connection side end of the traction rope 5. Is provided with a metal connection ring 12, and the connection strings 4, 4 are inserted through the ring 12. In this connecting structure of the tow rope 5, the connecting ring 12 is freely slidable in the length range of the connecting strings 4, 4, so that the tow rope 5 is pulled at the bent portion of the duct 7 as shown in FIG. Even when the fulcrum of the rope 5 changes, the opening of the cleaning device main body 2 can be oriented in the air flow direction so that the cleaning device main body 2 can be localized on the core O of the duct. Further, when the opening frame 2a of the cleaning device main body 2 is caught by protrusions such as screws scattered inside the duct at the time of cleaning, the connecting ring 12 slides by pulling the pulling rope 5. The opening frame 2a can be moved away from the inner wall of the duct while tilting the opening frame frame 2 with the hooked point as a fulcrum, and can pass through while avoiding the protrusion.
[0026]
On the other hand, the inner bag 3 is a bag body whose front end is opened and whose rear end is substantially closed. The illustrated inner bag 3 has a diameter-enlarged portion whose diameter is gradually enlarged from the front end side to the rear end side, and has a bag shape closed in a conical shape from the middle maximum diameter portion to the rear end. As the material of the inner bag 3, since it is provided inside the cleaning device main body 2, it does not require much rigidity, and a flexible and lightweight material such as cloth or vinyl is preferably used. As will be described later, the inner bag 3 has a function of effectively flapping the band-like folds 2b, 2b,... Of the cleaning device main body 2. If this function is satisfied, the inner bag 3 has a slight air permeability. Even use is possible. Further, if the traction force is excessive, a ventilation hole may be formed and adjusted. The shape of the inner bag 3 is preferably substantially similar to the duct shape, like the cleaning device body 2.
[0027]
In addition, an opening frame 3a is provided at the front end portion in order to hold the inner bag 3 in a predetermined shape, in the illustrated example, in a circular shape. Since the opening frame 3a is auxiliary, it does not require strong rigidity, and hard vinyl chloride, urethane rings, etc. may be used in addition to metals.
[0028]
The cleaning device main body 2 is connected by a plurality of connecting strings 6, 6... Having one end fastened to the opening frame frame 2a of the cleaning device main body 2 and the other end fastened to the opening frame frame 3a of the inner bag 3. The inner bag 3 is freely movable within the length range of the connecting strings 6, 6.
[0029]
[Operating Principle]
Next, the operation principle of the duct cleaning apparatus 1 according to the present invention will be described in detail with reference to FIG.
[0030]
When the duct cleaning device 1 is arranged in the duct and the wind is sent, the inner bag 3 expands and closes most of the cross section of the duct 7, so that a static pressure difference (P1−P2) is generated between the front and rear portions of the duct cleaning device 1. ). As a result, along with this static pressure difference, a high-speed air flow SA is generated between the inner wall of the duct and the inner bag 3 due to the reduction of the cross section of the flow path by the inner bag 3. Therefore, it is possible to reliably convey dust struck down from the duct inner wall to the rear side of the duct cleaning device 1 by the airflow flowing between the duct inner wall and the inner bag 3 with a small air volume. Further, the duct cleaning device 1 can travel as far as it can get on the wind in the duct by the tensile force determined by the wind pressure resistance × the cross-sectional area A of the inner bag 3.
[0031]
Further, the high-speed air flow SA is used as a power source for effectively scraping the band-like folds 2b, 2b,. The inner bag 3 gradually reduces the cross-section of the flow path, thereby generating turbulent flow, and the strip-like fold 2b serves as a valve for air passing between the duct inner wall and the inner bag 3. As a result, the movement between the outer side of the inner bag 3 and the inner wall of the duct is free. That is, the flow path cross-section is gradually reduced by the inner bag 3 to generate a reflected flow, and a turbulent flow is generated by the influence of the reflected flow, and is generated between the inner bag 3 and the duct inner wall. The high-speed air flow SA forms a pressure P3 in the gap between the inner wall of the duct 7 and the outside of the cleaning device body 2 and a pressure P4 in the gap between the inside of the cleaning device body 2 and the outside of the inner bag 3. At this time, due to the inclined shape of the inner bag 3 and the inlet side of the cleaning device main body 2, when P3> P4 and the belt-like fold 2b of the cleaning device main body 2 is drawn toward the inner bag 3, the cleaning device main body 2 Since the gap between the inner side and the outer side of the inner bag 3 is smaller than the gap between the inner wall of the duct 7 and the outer side of the cleaning device body 2, the pressures are reversed to satisfy P4> P3. When P3 becomes lower than P4 and the belt-like fold 2b is pulled toward the inner wall of the duct, this time, the pressure is smaller in the gap between the inner wall of the duct and the outside of the cleaning device body 2, and the relationship between the pressures is P3> P4. Reverse again. By repeating this, the belt-like fold 2b is forced to wave, and the belt-like fold 2b can be effectively brought into contact with the inner wall of the duct.
[0032]
[Cleaning method]
(First embodiment)
In the first embodiment, as shown in FIG. 5, an air flow is generated in the duct by a dust collector when cleaning the duct.
[0033]
The boundary between the air conditioner 9 and the duct 7 is blocked by a partition plate 13, the suction hose 11 of the dust collector 10 is connected to a predetermined location of the duct 7, and the duct cleaning device 1 is inserted from an insertion port 14 provided at a predetermined location of the duct 7. Insert. Then, while the air flow is generated in the duct 7 by suction by the dust collector 10, the inside of the duct 7 is moved little by little while operating the duct cleaning device 1 with the tow rope 5 and is attached to the inner surface of the duct by the belt-like fold 2b. The dust 8, 8... Is struck down and placed in an air current and collected by the dust collector 10.
[0034]
(Second embodiment example)
As shown in FIG. 6, the second embodiment is an example in the case where an air conditioner is operated to clean the duct and an air flow is generated in the duct.
[0035]
Openings 14 and 15 are provided at predetermined locations of the duct, and after the duct cleaning device 1 is inserted from the opening 14 on the windward side, the opening is closed with the sealing plate 16 leaving a clearance between the traction ropes 5 and the opening 15 on the leeward side. Is connected to a vinyl tube 18 provided with a bag filter 19. Further, the downstream side of the opening 15 is sealed by the partition plate 17.
[0036]
Then, in a state where the air conditioner 9 is operated and an air flow is generated in the duct 7, the duct cleaning device 1 is moved little by little while operating the tow rope 5, and the dust 8 attached to the inner surface of the duct by the belt-like fold 2 b. , 8..., And dust 8 is collected by a filter such as a bag filter 19.
[0037]
【The invention's effect】
As described above, according to the present invention, even with a dust collector or the like having a small air volume, the inner surface of the duct can be uniformly cleaned without leaving dust in the duct, and the belt-like folds of the blow-off type cleaning device can be removed. Effective contact with the inner surface of the duct becomes possible.
[0038]
Further, even in the bent portion of the duct, the cleaning device can be positioned on the axial center of the duct without being biased to one side, and can be uniformly cleaned regardless of the inner peripheral side or the outer peripheral side.
[Brief description of the drawings]
FIG. 1 is a perspective view of a duct cleaning apparatus 1 according to the present invention.
FIG. 2 is an enlarged view showing a connecting portion of the traction rope 5;
FIG. 3 is a schematic diagram for explaining an operation principle of the duct cleaning apparatus 1;
4 is a state diagram of the duct cleaning device 1 at a bent portion of the duct 7. FIG.
FIG. 5 is a diagram illustrating a first mode example of a duct cleaning method using the duct cleaning apparatus 1;
FIG. 6 is a diagram showing a second mode example of a duct cleaning method using the duct cleaning apparatus 1;
FIG. 7 is a perspective view of a conventional blow-off type duct cleaning apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Duct cleaning apparatus, 2 ... Cleaning apparatus main body, 2b ... Strip-shaped fold, 3 ... Inner bag, 4 * 6 ... Connection string, 5 ... Tow rope, 7 ... Duct, 8 ... Dust, 9 ... Air conditioner, 10 ... Dust collector , 12 ... Ring for connection, 16 ... Bag filter

Claims (4)

Both the front and rear end faces are open, forming a cylindrical body whose diameter is gradually enlarged from the front end side to the rear end side, and a large number of band-like pleats are formed in the rear side portion in the circumferential direction, and the string-like member on the front end side A blow-off type duct cleaning device main body to which a tow rope is connected, and an inner side of the blow-type duct cleaning device main body, the front end side being opened, the rear end side being substantially closed , and the front end side has a diameter portion diameter is gradually enlarged toward the rear end from, and Ri Do from the middle of the maximum diameter portion and the inner bag forms a bag shape that closes conically toward the rear end, the windsock type duct cleaning A large number of belt-like folds of the apparatus main body start from a position corresponding to the enlarged diameter portion of the inner bag, and extend to the rear end side beyond the intermediate maximum diameter portion of the inner bag. . The inner bag the windsock type duct cleaning apparatus a plurality of string-shaped member according to claim 1 Symbol mounting duct cleaning apparatus is supported via the one end of which is connected to the front end portion of the body. The windsock type duct cleaning apparatus main body and the inner bag, the duct cleaning apparatus according to claim 1-2 or with the outer shape as a substantially similar shape to the duct shape. A connection ring is provided at the connection side end of the tow rope, and one or a plurality of string-like members spanning the front end opening surface of the blow-down duct cleaning device body are inserted into the connection ring. The duct cleaning apparatus in any one of Claims 1-3 .

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