JP3614345B2 - Fin tube heat exchanger cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fin-tube heat exchanger cleaning device for cleaning dust adhering to fins in a fin-tube heat exchanger in which spiral fins are provided on the outer periphery of a tube to increase the heat transfer area.
[0002]
[Prior art]
In a finned tube heat exchanger with spiral fins on the outer periphery of the tube to increase the heat transfer area, liquid or gas flows inside the tube, gas flows outside the tube, and fluid in the tube passes through the fin. And heat exchange with the outside gas. The outside gas usually contains a lot of dust, and this dust adheres to the fins and gradually decreases the thermal efficiency. Therefore, a fin tube heat exchanger cleaning device is generally used that utilizes the fact that the fins are spiral, rolls the brush along the outer periphery of the tube, and cleans dust adhering to the fins. One example will be described with reference to the drawings. FIG. 6 is a plan view showing a part of a finned tube heat exchanger provided with a conventional cleaning device, wherein 1 is a U-shaped tube through which liquid or gas flows, and 11 is a spiral fin provided on the outer periphery thereof. 2 is a tube plate to which the end of the U-shaped tube 1 is attached, 21 is a tube support for supporting the other end of the tube 1, 3 is a disk-shaped brush for cleaning dust adhering to the fin 11, 4 is A brush guide for moving the brush 3 along the fin 11, 41 is a rotating sleeve that is rotatably fitted to the tube 1 at positions on both sides of the fin 11, and 43 is a rotating sleeve 41 at positions on both outer sides of the fin 11. The disc 44 and the disc 44 fitted together are arranged in the longitudinal direction so as to squeeze the fins 11, and the discs 43 on both sides are joined together by tightening nuts so as to rotate together. Both are a plurality of rods that slidably support the brush 3 in the longitudinal direction, 45 is a chain sprocket fitted integrally with the rotary sleeve 41 at an appropriate position of the rotary sleeve 41, 5 is a chain hung on the chain sprocket 45, 6 is a motor.
[0003]
FIG. 7 is a perspective view showing the brush guide 4 in which the brush 3 is attached to one rod 44 in the cleaning device shown in FIG. The brush guide 4 is composed of a rotating sleeve 41 on both sides, a disk 43 and a rod 44 for connecting them, and by rotating a chain sprocket 45 fitted to the rotating sleeve 41, the straight portion of the U-shaped tube 1 is centered. Rotate freely. The brush 3 is attached to at least one of the rods 44. When the rod rotates around the tube 1, the brush 3 moves spirally while rolling in the valleys of the fin 11, and covers the entire area of the fin 11. The valley will be cleaned. Therefore, the dust on the fins 11 is removed by appropriately rotating the motor 6 and moving the brush guide 4 according to the state of dust adhesion, and good heat exchange in the heat exchanger can be maintained.
[0004]
By the way, the brush guide 4 is necessary only at the timing of cleaning the dust of the fins, and does not contribute to the heat exchanger at the time of normal operation. Therefore, the rod 44 around the fin 11 needs to have a slim structure so as not to obstruct the gas flow around the fin 11 as much as possible. For this reason, in the conventional brush guide, a rod with a small volume is used as described above. However, since the structure tends to have insufficient rigidity, twisting occurs every time it tries to rotate, and it does not rotate lightly, so it rotates greatly. There is a problem that torque is required and the maintenance of the brush guide portion is troublesome. In addition, the twist may damage the fins.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve such problems in the conventional brush guide and to realize a fin-tube heat exchanger cleaning device provided with a brush guide having sufficient rigidity without hindering gas flow. And
[0006]
[Means for Solving the Problems]
The present invention is a fin-tube heat exchanger cleaning device for cleaning dust adhering to fins in a fin-tube heat exchanger having spiral fins provided on the outer periphery of the tube, and no fins are provided. A rotating sleeve that is rotatably fitted to the tube at an outer position and has one end projecting in the radial direction and having a disk shape, and one end joined to the rotating sleeve via the disk-shaped portion and extends in the longitudinal direction. A perforated steel pipe that has a plurality of notched windows and is placed on the tube so as to cover the outer surface of the fin, and at equal intervals in the circumferential direction that rotatably supports this at the other end of the perforated steel pipe An intermediate portion between the three support rollers arranged and two adjacent windows of the perforated steel pipe is used as a guide portion, and the tip is movable in the longitudinal direction along the guide portion. A fin-tube heat exchanger cleaning device, wherein the brush comprises an outer brush facing away from an inner fin. It is a cleaning apparatus of the fin tube type heat exchanger.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, a perforated steel pipe is used as a brush guide and is directly joined to the disk-shaped portion of the rotating sleeve, so that the brush guide is integrated and the rigidity is improved, and it rotates easily with a small torque. Less maintenance work.
[0008]
【Example】
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing a part of a finned tube heat exchanger provided with the cleaning device of the embodiment, and shows one tube corresponding to the upper or lower half in FIG. FIG. 2 is a perspective view showing a brush guide of the perforated steel pipe 4 to which the brush 3 is attached in the cleaning device shown in FIG. The same reference numerals are used for the parts described in FIG. 6, 22 is a support plate attached to the tube support 21, 23 is three support rollers attached to the support plate 22, and 42 is a perforated steel pipe. 4 is a guide portion.
[0009]
In this brush guide, a perforated steel pipe 4 in which a plurality of windows extending in the longitudinal direction are notched is used in a portion that covers the outer surface of the fin and becomes a guide member for moving the brush. The longitudinal window extends almost the entire length except for both ends of the steel pipe. In addition, when the length of the steel pipe is long, it is optional to divide this window by half of the total length, to provide a continuous part around the entire circumference in the longitudinal direction, and to attach the brush in two places in the longitudinal direction. is there.
[0010]
In FIG. 1, the end of the right rotating sleeve 41 is radially extended to form a disk shape, and one end of the perforated steel pipe 4 is joined thereto, and at the other end of the perforated steel pipe 4, a tube support Three support rollers 23 are arranged on a support plate 22 attached to 21 to rotatably support the inner surface of the other end of the perforated steel pipe 42. The chain sprocket 45 is fitted to the rotary sleeve 41 and driven by the chain is the same as that of FIG. 6 described above.
[0011]
The perforated steel pipe 42 maintains the rigidity of the steel pipe unless an extremely large hole is drilled. Therefore, compared to the conventional structure in which the rod is fastened to the disk with a nut, the perforated steel pipe 42 is rotated by loosening of the nut or deflection of the rod. There is no twisting, and the perforated steel pipe and disk are directly joined, so the whole structure is integrated, and it can be rotated easily with less torque without causing problems such as loosening. .
[0012]
FIG. 3 is a partial cross-sectional view taken along the line AA in FIG. 1 and shows a state in which the end of the perforated steel pipe 4 is rotatably supported by three support rollers 23. Since the window of the perforated steel pipe 4 does not reach the end, the perforated steel pipe 4 at the end supported by the support roller 23 has no window and is continuously supported over the entire circumference.
4 is a partial cross-sectional view taken along the arrow BB in FIG. An intermediate portion between two adjacent windows of the perforated steel pipe 4 is a guide portion 42 corresponding to a conventional rod, and the brush 3 is attached to this portion. Since the guide part 42 is a part of the steel pipe and has a flat shape, the brush 3 does not rotate but is guided by the fins 11 in the same posture and reciprocates in the longitudinal direction. The brush 3 includes a moving body 31 fitted to the intermediate portion, an inner brush 32 for cleaning dust in the fin, an outer brush 33 facing the inner brush 31, and an inner brush 32. It comprises a guide bar 34 that fits with the fin 11 and moves the entire brush 3 according to a spiral. When the hair of the inner brush 32 has high rigidity, the guide bar 34 can be omitted.
[0013]
The inner brush 32 cleans the dust on the fins 11 of the tube 1 inside the perforated steel pipe 4 as in the prior art, while the outer brush 33 is formed of another tube adjacent to the tube 1 in parallel. It is for cleaning. Let R be the distance from the center of the tube 1 to the tip of the outer brush 33.
FIG. 5 is a side view showing an example of the arrangement of the tubes of the heat exchanger. The tubes are arranged in a staggered manner with a left-right spacing P and a vertical spacing of 1/2 P. By setting the distance from the center of the tube 1 to which the cleaning device is to be attached to the tube outer diameter of the tubes 1a and 1b immediately above the tube 1 to a value equal to or less than R, the brush 3 becomes the tube 1 It can be seen from this figure that the outer brush 33 can clean inside the fins of the adjacent tubes 1a and 1b as it rotates around. Therefore, if the outer brush 33 is provided in the brush 3, the cleaning device of the present invention does not need to be provided in all the tubes of the heat exchanger, and may be installed, for example, every other stage.
[0014]
【The invention's effect】
According to the present invention, a fin-tube heat exchanger cleaning device provided with a brush guide having sufficient rigidity without hindering gas flow is realized, and it operates lightly with less torque and does not require maintenance. Has an excellent effect.
Furthermore, by providing the upper brush, there is an effect that the number of installed cleaning devices can be halved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a part of a finned tube heat exchanger including a cleaning device according to an embodiment of the present invention.
2 is a perspective view showing a brush guide in the cleaning device of FIG. 1; FIG.
FIG. 3 is a partial cross-sectional view taken along arrow AA in FIG.
4 is a partial cross-sectional view taken along arrow BB in FIG.
FIG. 5 is a side view showing an example of the arrangement of tubes of the heat exchanger according to the present invention.
FIG. 6 is a plan view showing a part of a finned tube heat exchanger provided with a conventional cleaning device.
7 is a perspective view showing a brush guide in the cleaning device of FIG. 6. FIG.
[Explanation of symbols]
1 Tube 2 Tube plate 3 Brush 4 Perforated steel pipe (brush guide)
5 Chain 6 Motor 11 Fin 21 Tube support 22 Support plate 23 Support roller 24 Fixed sleeve 31 Moving body 32 Inner brush 33 Outer brush 34 Guide bar 41 Rotating sleeve 42 Guide portion 43 Disc 44 Rod

Claims (2)

A fin-tube heat exchanger cleaning device for cleaning dust adhering to a fin (11) in a fin-tube heat exchanger having a spiral fin (11) provided on the outer periphery of a tube (1), the fin A rotating sleeve (41) which is rotatably fitted to the tube (1) at an outer position where (11) is not provided and has one end projecting in the radial direction to form a disc shape, and one end of the disc-shaped portion. A perforated steel pipe (4) that is joined to the rotating sleeve (41) and has a plurality of windows that extend in the longitudinal direction and that is cut out and covers the outer surface of the fin, and the perforated steel pipe (4). Three support rollers (23) arranged at equal intervals in the circumferential direction for rotatably supporting the steel pipe (4) at the position of the other end, and two adjacent windows of the perforated steel pipe (4) Middle part A fin tube type heat exchange characterized by comprising a brush (3) attached as an id portion (42) so as to be movable in the longitudinal direction along the tip portion and in contact with the valley of the fin. Device cleaning equipment. The cleaning device for a finned tube heat exchanger according to claim 1, wherein the brush (3) is provided with an outer brush (33) opposite to the inner fin.

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