JPH0481676B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic cleaning device for an open rack type vaporizer, which is a panel body in which heat transfer tubes are arranged side by side in a curtain shape.

[Conventional technology]

For example, in an open rack vaporizer for liquefied gas such as LNG, as shown in Figure 9, a large number of heat transfer tubes with fins are installed vertically in parallel between an upper header (tube) and a lower header (tube). A panel 1, which is a vaporizer, is formed.

The fins extend approximately parallel to the tube axis of the heat transfer tube, and a trough 2 is provided facing the width direction of the upper side of the panel 1. Water overflows from the trough 2 and flows onto the panel surface, discharging the liquefied gas. vaporize.

This flow of water down the panel surface is done to enhance the heat transfer effect of the vaporizer against ultra-low temperature liquids of minus 100 degrees.For example, seawater or fresh water that has been stored for a long time is used. case,
The panel surface becomes dirty with dirt, slime, microorganisms, etc. contained in the water, and requires periodic cleaning.

Conventionally, such dirt on the surface of the panel 1 is removed by stopping the operation of the vaporizer, setting up a scaffold between the panels 1 and 1 arranged in parallel as shown in FIG. 10, and manually using a brush or a cleaning device using jet water. It was being removed.

[Problems to be solved by the invention] However, with this manual cleaning method,
The operation of the vaporizer must be stopped for a long period of time (at least one week) for cleaning work, and since the work is done at heights, scaffolding is always required, and it is time-consuming to assemble and dismantle the scaffolding, and the use of scaffolding materials. There is also a risk that the surface of the panel 1 may be damaged due to collision.

Furthermore, the distance between panels 1 and 1 in parallel is 0.5m ~
Since the area is narrow, approximately 0.6 m in length, there is not enough work space, resulting in poor work efficiency and easy cleaning residue.
In addition, since cleaning is performed after the area has become sufficiently dirty, the heat exchange efficiency decreases until cleaning is performed, and the sewage film is also more likely to be disturbed by the dirt.

In addition, Japanese Patent Application Laid-open No. 58-47911 discloses a rotating wire brush that removes soot by rotating a wire brush placed between a group of tubes in a waste heat boiler and making it reciprocate in the tube axis direction. A soot removal device is shown.

Furthermore, in Japanese Patent Application Laid-Open No. 57-77898, as a cleaning device for the heat transfer surface of a heat exchanger, a cleaning plate that reciprocates inside the heat exchanger along the longitudinal direction of the heat transfer tube is provided, and the cleaning plate A plurality of holes are formed at positions corresponding to the arrangement of the heat exchanger tubes for passing the heat exchanger tubes through, and a reciprocating transmission means is provided on the cleaning plate for forcing the cleaning plate to reciprocate along the longitudinal direction. What is attached is shown.

These JP-A-58-47911 and JP-A-57-
The objects to be cleaned that are the object of Publication No. 77898 are all smaller than the open rack vaporizer for liquefied gas such as LNG that is the object of the present invention.

Because of its small size, it is possible to clean multiple pipes at the same time with a large number of brushes corresponding to the number of pipes, but with an open rack type vaporizer, it is impossible to clean many pipes at the same time due to its size. Unexamined Japanese Patent Publication 1983
The techniques of JP-A-47911 and JP-A-57-77898 cannot be applied.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an automatic cleaning device using a rotating brush of an open rack type vaporizer, which can automatically clean even a large panel surface without manual effort, which has conventionally been done manually by setting up a scaffold.

[Means for solving problems]

In order to achieve the above object, the present invention forms a panel that is a vaporizer by vertically arranging a large number of heat transfer tubes with fins extending substantially parallel to the heat transfer tube axis between an upper header and a lower header. However, in an open rack type vaporizer that vaporizes liquefied gas by sprinkling water from a trough arranged above the panel, a first rail installed between the parallel vaporizer panels in parallel with the panels; , a running trolley provided with a cleaning machine having a rotating brush in contact with the panel surface at the lower part and sliding on the first rail; and a second rail installed in a direction perpendicular to the panels beside the ends of the parallel panels. , consisting of a short rail for extending the first rail, and a moving trolley that slides on the second rail, the short rail for extension having a take-in portion for the running trolley that is a vacant space around the short rail for extension; The main points are as follows.

[Effect]

According to the present invention, the cleaning machine scrubs the panel surface with the tip of a rotating brush, and uses running water from a trough to wash the panel surface while moving along the panel surface using a traveling cart that slides on the first rail. . In this way, if the two opposing sides of the parallel panels can be cleaned simultaneously, the traveling truck is housed together with the cleaning machine from the first rail into the moving truck. This moving trolley slides on the second rail and moves to the end of the first rail between the next panels, and at that position, the moving trolley is transferred to the first rail and cleaning of the surface of a new panel is started. , and then repeating the same steps to automatically clean all panel surfaces.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of an automatic cleaning device movable between orthogonal rails of an open rack type vaporizer according to the present invention. A first rail with an H-shaped cross section is installed in parallel, and 35 indicates parallel panels 1, 1,
1... in the direction perpendicular to the panels 1, 1, 1... and the first rail 3, and the rail 3
The second rail is shown at a position slightly higher than the second rail.

A rectangular cylindrical guide frame 5 is hung from the bottom of a self-propelled carriage 4 using the lower flange of the rail 3 as a guide, and an air motor 6 is housed inside the guide frame 5 as shown in FIG. Similarly, a support post 7 is vertically installed close to and parallel to the guide frame 5 from the traveling truck 4, sprockets 8 and 9 are installed between the middle and lower ends of the support post 7, and a chain belt 10 is wound around these. did. Furthermore, the lower sprocket 9 and the output shaft of the air motor 6 are
The bevel gear 11 on the output shaft side and the bevel gear 12 meshing therewith are connected via a rotating shaft 14 having one end provided with a spur gear 13 at the other end, and a spur gear 15 meshing with the spur gear 13 and coaxial with the sprocket 9.

On the other hand, as shown in FIG.
A total of two rotating brushes 18 made of nylon and rotated by an air motor 17, which is the main part of the cleaning machine, are arranged side by side on the left and right sides. 19 in the figure is the lifting head 16
This is a guide roller that is provided in the guide frame 5 and rolls around the outer periphery of the guide frame 5. One end of a connecting rod 20 serving as a link is pivoted to the side of the lifting head 16,
The other end of the connecting rod 20 was pivoted to the chain belt 10.

The traveling cart 4 may have its own drive motor for driving, but in this embodiment, an air motor 6 is used.

FIG. 4 is a longitudinal sectional side view of a portion of the traveling truck 4, in which wheels 21 are provided facing inward from a housing 4a having a U-shaped cross section, and are brought into contact with the upper surface of the lower flange of the rail 3.

On the other hand, a sprocket 23 is provided coaxially with the sprocket 8 provided in the middle of the support post 7, and this is connected to a sprocket 26 provided at the end of the rotating shaft 25 in the lower part of the housing 4a via a chain belt 24.
A worm gear 2 is connected to the rotary shaft 25, and a worm gear 2 is connected to the
A gear 29 is provided at the end of a rotating shaft having a gear 28a in the center that meshes with the worm gear 27, and this gear 29 meshes with a gear portion 21a having teeth cut in the flange of the wheel 21.

In the figure, 30 is a sprocket for tensioning the chain belt 24, 31 is a guide roller provided horizontally at the upper end of the housing 4a and comes into contact with the side surface of the upper flange of the rail 3, and 32 is a spring built into the lower support stand ( (not shown) These guide rollers 31 and 32 are pressed against the lower surface of the rail 3 by the elasticity of the spring, and these guide rollers 31 and 32 have the role of preventing the bogie 4 from wobbling while traveling.

The rails 35 are, for example, C-shaped channel members facing each other with their webs facing outside, as shown in FIG.

In the figure, 37 is a moving trolley suspended from the rail 35 in a monorail manner with wheels 36;
As shown in the figure, an air motor 38 for rotationally driving the wheels 36 and a speed reducer 39 connected thereto are provided on the upper surface thereof, and both sides are surrounded by hoods 40 to form a gate shape with an open center.

The short rail 33 for extending the first rail 3 is attached to the center of the moving trolley 37, and the area around it is a blank space to form the intake portion 34 for the traveling trolley 4.
Furthermore, a connecting air cylinder 41 is mounted on the trolley 37 so as to protrude slightly toward the rail 3 than the rail 33, and a locking tray 42 is provided on the upper surface of the rail 3 into which the rod end of the cylinder 41 is inserted. .

In the figure, 43 is a guide roller that prevents the bogie 37 from rattling by sandwiching the lower flange of one side member of the rail 35 from both sides, and 44 is a guide roller located under the other side member of the rail 35 at each position corresponding to the rail 3 in the orthogonal direction. The provided protruding piece-like hanging piece 45 is provided on the upper surface of the truck 37, and is attached to the arm 4 provided with the shock absorber 45b.
Reference numeral 5c is an air cylinder 45a, and a stopper is protruded to the side so as to engage with the locking piece 44.

Next, to explain the usage and operation, seawater is flowed from the trough 2 to the vaporizer panel 1,
The surface of the panel 1 is covered with a film of flowing water.

First, assuming that the traveling truck 4 is on the first rail 3, the guide frame 5 hanging from the traveling truck 4 is
is a nylon rotating brush 18 of the lifting head 16, which is located in the center between the panels 1, 1 parallel to the surface of the panel 1, and is attached so as to hug the guide frame 5.
The brush tip is in contact with the surface of the panels 1, 1.

In this state, if the air motor 17 is started and the rotary brush 18 is rotated, the brush tip will rub the surface of the panel, and cleaning will be performed using the flowing water.

On the other hand, if the air motor 6 is driven while rotating the rotary brush 18 in this way, the sprocket 9 will rotate via the transmission member bevel gear 11 → bevel gear 12 → rotating shaft 14 → spur gear 13 → spur gear 15 → the sprockets 8, 9. The chain belt 10 in between also rotates. This chain belt 1
0 movement, the elevating head 16 is also pushed up along the guide frame 5 via the connecting rod 20, and when the connecting rod 20's pivot point to the chain belt 10 exceeds the upper sprocket 8, the chain is moved upward. Following the belt 10, the head 16 descends.

In this way, the rotating brush 18 moves up and down along the guide frame 5 while rotating itself, but the rotation of the sprocket 8 is also caused by the rotation of the sprocket 23 → chain belt 24 → sprocket 26 →
The transmission is transmitted from the rotating shaft 25 to the worm gear 27 to the gear 28a, and the wheel 21 rotates. As a result, the cart 4 moves forward along the rail 3, and the rotating brush 18 moves on the surface of the panel 1 while drawing a trajectory as shown in FIG. 8, thereby thoroughly cleaning the entire panel.

The first rail 3 on which the traveling carriage 4 is located has a moving carriage 37 at its end, and the first rail 3 has a moving carriage 37 on it.
The short extension rail 33 in 7 is joined, and the rod end of the connecting air cylinder 41 on the truck 37 side is inserted into the locking tray 42 on the rail 3 side and fixed. The trolley 4 is a moving trolley 37 along with the entire cleaning machine such as the lower guide frame 5 and support post 7.
It is stored in the intake section 34 of.

The mobile trolley 3 with the traveling trolley 4 loaded in this way
Step 7 pulls in the arm 45c of the stopper 45 and removes the shock absorber 45b from the hook 44. Then, when the motor 38 is started, the wheels 36 rotate via the reducer 39 and roll on the rails 35.

As soon as the movable trolley 37 starts moving, the arm 45c of the stopper 45 is projected, and when the moving trolley 37 moves to the position of the first rail 3 between the next panels 1 and 1, the shock absorber 45b hits the latch piece 44, and the trolley 37 Stop.

Then, the connecting air cylinder 41 is extended to fixedly connect the rail 33 to the rail 3, and the traveling carriage 4 is moved to move the cleaner and the cleaning machine to the rail 3 side. Thereafter, in the same manner, the facing surfaces between the next panels 1 and 1 are cleaned with a rotating brush.

〔Effect of the invention〕

As described above, the automatic cleaning device of the present invention, which is movable between the orthogonal rails of the open rack type vaporizer, can be used in a narrow space between many parallel panels, which has enough space for a person to enter, but is narrow as a work space. It is possible to automatically clean the panel surface without entering the room and requiring manual intervention, and in this case, cleaning work can be performed while the vaporizer is in operation without stopping its operation. In addition, since it does not require human hands, it is safe and does not require scaffolding, etc. Furthermore, cleaning can be started at any time, so it can be cleaned frequently without leaving it for a long time, and it does not accumulate dirt and reduce heat exchange efficiency. There is no need to worry about the situation or the situation where the sewage film becomes easily disturbed.

Also, once you have finished cleaning between one panel,
Since the cleaning parts are automatically transferred from one panel to the next, the entire process can be performed in automatic continuous operation.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the open rack type carburetor of the present invention which is movable between orthogonal rails;
Figure 2 is a partially cutaway front view of the main parts of the above, Figure 3 is a cross-sectional view taken along the line A-A in Figure 2, Figure 4 is a longitudinal side view of the traveling truck, and Figure 5 is the moving truck. 6 is a front view of the same as above, FIG. 7 is a plan view of the same as above,
Fig. 8 is an explanatory diagram showing the locus of the rotating brush, Fig. 9 is a partial perspective view of the open rack type carburetor, and Fig. 10 is a partial perspective view of the open rack type carburetor.
The figure is an explanatory diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1...Panel, 2...Trough, 3...First rail, 4...Traveling trolley, 4a...Housing, 5
...Guide frame, 6...Air motor, 7...
Support post, 8, 9... Sprocket, 10...
Chain belt, 11, 12...Bevel gear, 1
3, 15... Spur gear, 14... Rotating shaft, 16
... Lifting head, 17 ... Air motor, 18 ...
Rotating brush, 19... Guide roller, 20... Connecting rod, 21... Wheel, 21a... Gear part, 23,
26... Sprocket, 24... Chain belt, 25, 28... Rotating shaft, 27... Worm gear, 28a, 29... Gear, 30... Tension sprocket, 31, 32... Guide roller,
33...Short rail for extension, 34...Intake part of traveling trolley, 35...Second rail, 36...Wheel,
37...Moving trolley, 38...Air motor, 39
... Reduction gear, 40 ... Hood, 41 ... Connection air cylinder, 42 ... Locking tray, 43 ... Guide roller, 44 ... Latching piece, 45 ... Stopper,
45a...Air cylinder, 45b...Buffer, 4
5c...Arm.

Claims (1)

[Claims] 1. Between the upper header and the lower header, a large number of heat exchanger tubes with fins extending substantially parallel to the axis of the heat exchanger tubes are vertically arranged in parallel to form a panel that is a vaporizer,
In an open rack type vaporizer that vaporizes liquefied gas by sprinkling water from a trough disposed above the panel, a first rail installed between the parallel vaporizer panels in parallel with the panels; a running trolley provided with a cleaning machine having a rotating brush that contacts the panel surface and slides on the first rail; a second rail installed in a direction perpendicular to the panels beside the ends of the parallel panels; It is characterized by consisting of a short rail for extending the first rail, and a moving trolley that slides on the second rail, the short rail for extension having a take-in portion for the moving trolley that is a vacant space around the short rail for extension. An automatic cleaning device that can be moved between the orthogonal rails of an open rack vaporizer.