JP3449288B2 - Duct cleaning device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct cleaning device, and more particularly to a cleaning device suitable for removing dust adhering to the inner wall surface of an air conditioning duct.

[0002]

2. Description of the Related Art Generally, an indoor air conditioner in a building is
Air-conditioning air is supplied to an air-conditioning duct that extends around the inside of a building. However, in such an air-conditioning device, dust accumulates in the air-conditioning duct after many years of use. Therefore, various cleaning devices have been conventionally proposed to remove dust adhering to the inner wall surface of the air conditioning duct.

For example, Japanese Utility Model Laid-Open No. 62-132796 has a truck that can run inside a duct, and a rotating brush is attached to the lower surface, upper surface, and left and right side portions of the front portion of the truck. There is proposed an apparatus for scraping dust adhering to the inner surface of a duct with a rotating brush while running the brush to clean the brush. In this case, if necessary, a suction port can be provided at the rear of the truck to suck the dust scraped off with a brush and discharge it outside, or to expel compressed air to the front of the truck to send the dust forward. Is shown.

Further, in Japanese Patent Laid-Open No. 10-249297,
A structure that forms a rectangular frame structure that follows the inner surface of the duct, forms a suction chamber in each frame portion facing each surface of the duct, and makes the suction chamber an expandable structure to follow the fluctuation of the size of the duct Are presented. The rectangular frame is made to be able to travel and the dust adhering to the inner surface of the duct is sucked and removed while traveling in the duct.

Further, as shown in FIG. 10, a cleaner 2 is mounted on a traveling carriage 1 and is arranged in front of the carriage 1 at a suction port 3 of the cleaner 2, and a surveillance camera 4 is attached to a duct. It is also known to make the vehicle move inside. This is operated by a controller 6 provided with an observation video monitor 5 provided outside, and while controlling the movement direction of the carriage 1 with the camera 4, movement control is performed toward a dust portion,
At the same time, the dust sucked through the suction port 3 is housed inside the cleaner 2 to prevent scattering.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the duct cleaning method using the device disclosed in No. -132796, it is difficult to remove the dust soared by the brush, and in the case of the air conditioning duct, it is necessary to stop the air conditioning. When applied to an air conditioning duct of a nuclear power plant, there is a problem that the air conditioner cannot be stopped for a long time due to radiation protection, and this type of duct has a drawback that it cannot be cleaned using the above device.

On the other hand, in the case of the device disclosed in Japanese Patent Laid-Open No. 10-249297, although there is an advantage that the suction area can be adjusted even if the duct size changes, there is distortion such that the inner surface of the duct is wavy. However, there is a problem that the suction means does not come into close contact with all of the inner wall surface of the duct, and the air that is biased from the gap prevents the dust on the entire cleaning surface from being reliably removed.

Further, in the latter device, the device expands and contracts in the width direction of the duct when passing through the bent portion of the duct. Therefore, when the rotational speeds of the inner drive wheel and the outer drive wheel are constant, the device is driven by a difference in drive distance. There was a problem that his posture became unstable. In addition, in a cleaning device with a camera equipped with a vacuum cleaner, movement control of the dolly is important, and it is difficult to operate and it is not possible to move laterally when cleaning a large duct. There was a problem that I had to do.

In view of the above-mentioned conventional problems, the present invention can surely clean dust adhering to the inner wall surface of the duct whose cleaning surface is distorted, so that the duct can be stably run. In addition, it is an object of the present invention to provide a duct cleaning device and a duct cleaning method suitable for cleaning an air conditioning duct of a nuclear power plant.

[0010]

In order to achieve the above object, a duct cleaning device according to the present invention is a cleaning device for cleaning the inside of a rectangular duct, and comprises a telescopic beam which expands and contracts by an air cylinder in the width direction of the duct. And a cleaning means having a small-diameter suction port that reciprocates in the duct width direction on the telescopic beam, and a means for pressing the small-diameter suction port by forming a minute gap on the inner wall surface of the duct. It is characterized by being provided. In this case, the small-diameter suction port is attached to a lever pivotally attached to the traveling body, and can reciprocate in the duct width direction by swinging the lever.

[0011]

According to the above construction, the cleaning means is opposed to the cleaning surface, and the telescopic frame is expanded by the air cylinder to form the cleaning surface copying frame. Since such cleaning surface copying frame is moved in the extension direction of the duct and the cleaning means reciprocating in the width direction of the cleaning surface traces the cleaning surface along with the movement, it is possible to reliably clean the dust adhering to the inner wall of the cleaning surface. .

If a small-diameter suction port communicating with the suction unit is provided as the cleaning unit, the cleaning unit can be moved in the duct extension direction while being in contact with the inner wall of the duct, so that dust adhering to each inner wall of the duct can be moved. Are successively sucked into the cleaning means from the suction port by the suction means, and can be efficiently discharged to the outside of the duct.

In the case of cleaning a large distorted duct, the small cleaning means is reciprocally moved to trace the cleaning surface, so that the cleaning surface can be distorted. Further, by providing a means for pressing the small-diameter suction port by forming a minute gap on the inner wall surface of the duct, the wind speed at the suction portion can be increased, and the dust removal rate can be improved. When a brush is attached to the suction port of the cleaning means, the cleaning surface is brushed by the reciprocating movement of the cleaning means, so that a high dust removal rate can be obtained without a complicated structure such as a rotating brush.

In the above-mentioned invention, the apparatus is moved by mounting the motor on the apparatus and driving the wheels, so that the inside of the duct can be automatically cleaned. Also, when passing through the bent part of the duct, the auxiliary rolling wheel provided in the center part of the frame abuts on the inner wall surface and rotates, and the inner drive wheel idles, so that there is no special method such as rotation speed control, It can also be made to run stably.

By connecting the suction hose to the vacuum pipe for cleaning the building, a strong suction force can be obtained safely and easily. By installing a filter on the opening of the air conditioning duct on the downstream side from the cleaning area, even if dust is scattered due to running of the device, the dust will be filtered by the filter and will not be introduced into the room. . Therefore, there is an advantage that the duct can be cleaned without stopping the air conditioning of the building of the nuclear power plant.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the duct cleaning device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a duct cleaning device according to an embodiment, and FIGS. 2 to 4 are a front view, a plan view, and a side view of the device. As shown in these drawings, the duct cleaning device 10 is for cleaning the bottom surface of the rectangular duct 12 (see FIG. 6), and the traveling body 14 that can travel on the bottom surface of the duct and this traveling body 1
4 is equipped with a cleaning means 40.

The running body 14 has a rectangular frame structure, and has parallel vertical beams 16R along the side wall of the duct 12.
16L and a pair of front and rear expansion beams 18F and 18B along the duct cross section are assembled in a rectangular shape. As shown in detail in FIG. 5, the telescopic beams 18F and 18B include telescopic beam components 18Fr and 18Br connected to the right vertical beam 16R, and telescopic beam components 18Fl connected to the left vertical beam 16L. It consists of 18 Bl. The front telescopic beam 18F is composed of its constituent materials 18Fr, 18
The slide guide 20F is configured to be slidable relative to Fl. Similarly, the rear telescopic beam 18B has its constituent members 18Br and 18B1 slid together with the slide guide 20B.
Are configured so that they can slide relative to each other. As a result, the traveling body 14 has a structure in which the width can be expanded and contracted according to the width of the duct 12.

Further, air cylinders 22F and 22B are provided with vertical beams 16 at the set positions of the expansion beams 18F and 18B.
The air cylinder 2 is attached across R and 16L.
By introducing air into the 2F and 22B, an extension operation is performed so as to widen the width of the traveling body 14, and the traveling body 14 is elastically biased to the duct side wall by a predetermined air pressure. By the way, the vertical beams 16R, 1
6L has its front and rear ends formed to extend beyond the connecting position of the telescopic beams 18F and 18L, and the drive wheels 24 are attached to each tip. The drive wheels 24 are arranged on the lower surfaces of the front and rear ends of the vertical beams 16R and 16L, and are arranged on the upper surface of the drive motor 2
6 can be driven to rotate about the vertical axis. Therefore, when the traveling body 14 is widened by the operation of the expanding and contracting air cylinders 22F and 22B, the driving wheels 24 at the four corners are compressed on the side walls of the duct 12, and the traveling body 14 can be driven by the drive of the motor 26. It has a structure.

The longitudinal beams 16R, 16 of the traveling body 14 are also provided.
Two support wheels 28 are attached to the front and rear of the lower surface of the central portion of L, respectively. This support wheel 28 rolls back and forth while holding the traveling body 14 at a constant height from the bottom surface of the duct, thereby enabling the traveling body 14 to move back and forth. Further, a pair of auxiliary wheels 30 mounted at a narrower interval than the pair of support wheels 28 are attached to the outer side surfaces of the vertical beams 16R and 16L, which means that the traveling body 14 moves along the bent portion of the duct 12. It has a function to move smoothly when doing.

Therefore, the running body 14 thus constructed can run on the floor by the support wheels 28, and
Even if the width of the duct 12 fluctuates, the drive wheels 24 rollingly contacted with the side wall of the duct allow the duct 12 to rotate a predetermined amount by the action of the telescopic air cylinders 22F and 22B and the telescopic beams 18F and 18B. The pressure is applied to the side wall of the duct so that the traveling body can travel while adjusting the width of the traveling body to the width of the duct.

The traveling means 14 is equipped with the cleaning means 40 as described above. The specific structure is as follows. As clearly shown in FIGS. 1 to 3, a pair of front and rear suction port cases 42F and 42B are attached to a central space of the traveling body 14 which is a rectangular frame. The front inlet case 42F is attached to the left beam component 18Fl of the front telescopic beam 18F,
The rear suction port case 42B is attached to the right beam component 18Br of the rear telescopic beam 18B. Both ends of each suction case 42 (42F, 42B) are attached to the left beam component 18Fl and the right beam component 18Br via the elevating guides 44. The suction port case 42 can be moved up and down by the lifting cylinder 46 supported by the beam components 18F1 and 18Br. Further, the both suction port cases 42F and 42B are set so as to overlap each other in the width direction of the duct 12 even when the width of the traveling body 14 changes. This ensures that the cleaning area will not be missing due to the suction port, which will be described later.

The front and rear suction port cases 42F and 42B described above.
A suction port 48 having a small diameter is housed inside. The suction port 48 has a box-shaped container structure with an opening on the lower surface, and a suction hose 5 connected to a negative pressure source at a mounting port 50 formed on the side wall.
By connecting two, negative suction pressure is introduced into the suction port. The opening on the lower surface of the suction port 48 is arranged so as to face the running floor surface. In this embodiment, the brush 54 is built in, and also wheels not shown are built in. As a result, the suction port 48 slides on the cleaning surface, so that the brush removes dust adhering to the floor surface of the duct, and at the same time, the suction hose 52 is acted upon by the negative pressure introduced.
Dust can be discharged to the outside through. Further, the built-in wheel has a function of maintaining a constant gap with the cleaning floor surface, has a function as a so-called spacer, and has a function of holding a minute gap to increase the suction wind speed.

The equivalent diameter of the suction port 48 is set to be small, and the suction port 48 is mounted so as to be able to reciprocate within the range of the length of the suction port case 42 described above. Therefore, the rodless cylinder 56 is attached along the length direction (duct width direction) of the suction port case 42, and the suction port 48 is attached thereto. Limit switches 58 are provided at both ends of the suction port case 42 so that the suction port 4
8 reciprocating ranges are defined. The suction port 48, which is moved by the operation of the rodless cylinder 56, turns on and off the limit switch 58 to generate a signal for switching the moving direction.

A support wheel 60 is also provided on the lower surface of the suction inlet case 42 which is moved up and down, and the case 42 which is lowered is operated.
Is kept at a certain height above the cleaning surface. By making the elastic force of the suction port case support wheel 60 smaller than that of the wheel built in the suction port 48, even if the reciprocating suction port 48 moves on the distorted cleaning surface, the suction port 48 is removed from the cleaning surface. It can be held at a desired height position.

Such a duct cleaning device 10 is shown in FIG.
As shown in FIG. 4, a suction hose 52 is connected. The hose 52 is provided with a control cable 62, an air tube 64, a vacuum cleaner 66, which serves as a suction negative pressure source installed outside the duct 12, and various electrical components. A control device 68 for processing,
And a compressor 70 for supplying working air to the air cylinder.

The procedure for duct cleaning using the duct cleaning device 10 is as follows. The cleaning device 10 is installed in the duct 12 through the inspection port 72 and the like, and is extended inside the duct by supplying air to the telescopic air cylinders 22 (22F, 22B), so that the drive wheels 24 of the traveling body 14 are attached to the side surface of the duct. Press it down. Next, air is supplied to the suction port elevating cylinder 46 to press the suction port 48 against the cleaning surface. At this time, by adjusting the pressing force of the suction port 48, the suction port 48 can be flexibly traced even if the cleaning surface has irregularities, and the dust removal rate can be improved. Then, the drive motor 26 is started to move the inside of the duct 12 for cleaning. At this time, in order to reduce uneven cleaning due to the reciprocating motion of the suction port 48, when the depth length of the suction port 48 is L and the time for making one reciprocation of the suction port 48 is T, the traveling speed of the traveling body 14 is V needs to be set so as not to exceed L / T.

FIG. 7 is a plan view showing a state in which the duct cleaning device 10 passes through the bent portion of the rectangular duct 12. In the conventional device, the traveling is unstable because the inner drive wheel precedes and starts to contract the width of the traveling body when passing through the bent portion of the duct, but in the present embodiment, the vertical beam 16 (16).
R, 16L) equipped with auxiliary wheels 30
Since the inner drive wheel 24 idles, the passage through the bent portion of the duct is stably performed. It has been confirmed that the auxiliary wheels 30 run stably if at least two auxiliary wheels 30 are provided in front of and behind the center of the vertical beam 16 with an arbitrary distance.

Next, FIG. 8 is an explanatory diagram applied to a case where the ventilation air conditioning system of a nuclear power plant is cleaned using the duct cleaning device 10 according to the embodiment. The air conditioning system 74 is composed of two systems of an intake system duct 76 and an exhaust system duct 78,
Air is supplied to the room by the air supply system fan 80,
The indoor air is sucked by the exhaust fan 82. The ducts branch as they move away from the fan, and the diameter also decreases. Since the cleaning is performed while ventilating the inside of the duct, the cleaning section is limited for each system, and the opening in the downstream region from the cleaning location is covered with the curing filter 84 for curing. The order of cleaning is such that the intake system duct 76 starts from the vicinity of the intake system fan 80, and the exhaust system duct 78 starts from the position farthest from the exhaust fan 82.

Vacuum pipes 86 for cleaning are arranged at various places in the building, and dust can be sucked by simply connecting one end of the suction hose 52 to the pipe coupler 88. A dust collector that can carry a suction device may be used in place of the vacuum pipe 86.

FIG. 9 shows a perspective view of the duct cleaning device 10A according to the second embodiment. In the first embodiment described above, the suction port 48 is configured to reciprocate in the duct width direction, but the second embodiment is different in that the suction port 48A is swung. That is, the box-shaped container 90 is attached to the suction port case 42, and the suction port 48 is attached to the tip of the horizontal lever 92 pivotally attached to the box-shaped container 90.
A is attached. The horizontal lever 92 may have an air passage formed therein to communicate with the suction port 48A, and the box container 90 may be used as a relay box for introducing negative pressure. By swinging the horizontal lever 92 in a predetermined angle range using a motor or the like, the suction port 48A attached to the tip can be moved to every corner of the duct 10. The front and rear suction ports 48A may be offset to the left and right with respect to the center of the traveling body 14. With such a structure, the reciprocating range of the suction port 48A can be expanded, and the dust removal work without uneven cleaning can be performed.

[0031]

As described above, the present invention is a cleaning device for the inside of a rectangular duct, which has a traveling body equipped with a telescopic beam that expands and contracts by an air cylinder in the width direction of the duct. Since the cleaning means having the small-diameter suction port that reciprocates in the width direction is provided and the means for pressing the small-diameter suction port by forming a minute gap on the inner wall surface of the duct is provided, the cleaning surface may be distorted. The dust adhering to the inner wall surface of the duct can be reliably cleaned, and the bent portion of the duct can be stably run. Further, the small-diameter suction port is attached to a lever pivotally attached to the traveling body, and the swinging of the lever enables reciprocating motion in the duct width direction, so that the lever is rotated at a predetermined angle by using a motor or the like. By oscillating in the range, the suction port attached to the tip can be moved to every corner of the duct, and cleaning efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a duct cleaning device according to an embodiment.

FIG. 2 is a front view of the same device.

FIG. 3 is a plan view of the device.

FIG. 4 is a side view of the same device.

FIG. 5 is a plan view of a traveling body of the device.

FIG. 6 is a perspective view illustrating a usage state of the device.

FIG. 7 is a plan view showing a state in which the apparatus passes through a bent portion of a duct.

FIG. 8 is an explanatory diagram when the same apparatus is used for cleaning a nuclear air conditioning duct.

FIG. 9 is a perspective view of a duct cleaning device according to a second embodiment.

FIG. 10 is a perspective view of a duct cleaning device according to a conventional example.

[Explanation of symbols]

10 Duct cleaning device 12 rectangular duct 14 running bodies 16R, 16L vertical beam 18F, 18B telescopic beam 18Fr, 18Br telescopic beam components 18 Fl, 18 Bl telescopic beam components 20F, 20B slide guide 22F, 22B Telescopic air cylinder 24 drive wheels 26 Drive motor 28 Support wheels 30 auxiliary wheels 40 Cleaning means 42F, 42B Suction port case 44 Lifting guide 46 Lifting cylinder 48 Suction port 50 mounting port 52 Suction hose 54 brush 56 Rodless cylinder 58 Limit switch 60 Suction case support wheel 62 control cable 64 air tube 66 vacuum cleaner 68 Control device 70 Compressor 72 Inspection port 74 Ventilation and air conditioning system 76 Intake duct 78 Exhaust system duct 80 Intake fan 82 Exhaust system fan 84 Curing filter 86 Vacuum piping for cleaning 88 piping coupler 90 box type container 92 Horizontal lever

Claims (2)

(57) [Claims] 1. A cleaning device for the inside of a rectangular duct, comprising a running body provided with a telescopic beam that expands and contracts by an air cylinder in the width direction of the duct, and has a small diameter suction that reciprocates in the telescopic beam in the duct width direction. A duct cleaning device comprising: a cleaning unit having a mouth, and a unit for pressing the small-diameter suction port by forming a minute gap on an inner wall surface of the duct. 2. The duct according to claim 1, wherein the small-diameter suction port is attached to a lever pivotally attached to the traveling body, and can reciprocate in a duct width direction by swinging the lever. Cleaning device.