JPH0561687U - Cleaning tool for heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically forcibly removes foreign matter adhering to the surface of the heat medium passage 8. A frame member 28 is arranged in a tunnel-shaped water passage 15 so as to surround the heat medium passage 8, and the frame member 28 is pressed by the pressure of water flowing in the water passage 15 in forward and reverse directions. The brush-like cleaning body 29 attached to the frame member 28 is moved to remove foreign matter adhering to the surface of the heat medium passage 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cleaning tool for a heat exchanger.

[0002]

[Prior Art]

 As a conventional sewage heat exchanger, for example, a shell and tube type heat exchanger as shown in FIG. 6 is known. In this heat exchanger for sewage, both ends of a cylindrical shell 1 are sealed by lids 2 and 3, and tube plates 4 and 5 are arranged inside the shell 1 at predetermined intervals in the axial direction. Chambers 6 and 7 are formed between the plates 4 and 5 and the lids 2 and 3. A heat medium passage 8 composed of a large number of tubes is supported and fixed to the tube plates 4 and 5 along the axial direction of the shell 1, and both axial end portions of the heat medium passage 8 are inside the chambers 6 and 7. It is open at. The chamber 7 on one side is divided into a first chamber 7A and a second chamber 7B by a partition plate 9, and the shell 1 has an inlet 10 for the heat medium F leading to the first chamber 7A and a second chamber 7B. An outlet 11 for the heating medium F communicating therewith is formed. On the other hand, an inlet 12 and an outlet 13 for the sewage W, which communicate with the space X between the tube sheet 4 and the tube sheet 5, are formed at both ends of the space X in the axial direction so as to be separated from each other. In the space X, the heat medium passage 8 is supported by a plurality of support plates 14 which have a predetermined interval in the axial direction and which extend in the radial direction from the inside of the shell 1 in the opposite direction alternately. Thus, a zigzag water passage 15 is formed in the shell 1 in the axial direction.

In the sewage heat exchanger configured as described above, the heat medium F such as the freon gas introduced from the inlet 10 is composed of the first chamber 7A of the chamber 7 on one side → a large number of tubes. Upper half of the heat medium passage 8 → the other chamber 6 → the lower half of the heat medium passage 8 composed of a large number of tubes → the second chamber 7B of the one chamber 7 → the path of the outlet 11 Spill out at. On the other hand, the sewage W introduced from the inlet 12 flows out from the outlet 13 via the zigzag water passage 15. The sewage W is indirectly heat-exchanged with the heat medium F passing through the heat medium passage 8 while flowing through the zigzag water passage 15.

However, when foreign matter contained in the sewage F flowing in the zigzag-shaped water passage 15 adheres to the surface of the heat medium passage 8, the flow resistance of the sewage F and the film thermal resistance are significantly increased. As a result, the heat exchange efficiency is significantly reduced. Therefore, cleaning is required to regularly remove foreign matter adhering to the surface of the heat medium passage 8. However, in the conventional sewage heat exchanger, even if the lids 2 and 3 are removed, most of the surface of the heat medium passage 8 is not exposed, so the cleaning work is troublesome and it is difficult to properly clean the details. Therefore, there is a drawback that the cleaning effect cannot be expected.

[0005]

[Issues to be resolved]

 The problem to be solved is that the cleaning work of the heat medium passage is troublesome, and since it is impossible to properly clean the details, it is not possible to expect complete recovery of the heat exchange efficiency.

[0006]

[Means for Solving the Problems]

 The invention of claim 1 is provided with a tunnel-shaped water passage for flowing water, and a heat medium passage formed of a plurality of tubes arranged in the water passage along the longitudinal direction of the water passage. A cleaning tool for a heat exchanger, the frame member being disposed in the tunnel-shaped water passage so as to surround the heat medium passage and movable by hydraulic pressure, and the frame member attached to the frame member. And a cleaning body that comes into sliding contact with the surface of the heat medium passage by the movement of the heat medium passage, and the object of properly cleaning the details of the heat medium passage can be achieved by performing automatically.

Further, the invention of claim 2 is characterized in that the cleaning body is replaceably attached to the frame member, and it is possible to avoid a significant decrease in cleaning power by exchanging the cleaning body. I chose

[0008]

[Action]

 According to the invention of claim 1, the frame member moves in the water passage together with the water by the pressure of the water flowing in the tunnel-shaped water passage. By the movement of the frame member, the cleaning body attached to the frame member slides on the surface of the heat medium passage to forcibly remove the foreign matter adhering to the surface of the heat medium passage. The foreign matter removed from the surface of the heat medium passage is discharged downward together with water.

According to the second aspect of the present invention, the periodical replacement of the cleaning body avoids a significant decrease in the cleaning power caused by wear or deformation of the cleaning body. Therefore, the foreign matter can be reliably removed with excellent cleaning power at all times.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a sewage heat exchanger having a cleaning tool according to the present invention, FIG. 2 is a vertical sectional side view taken along the line A-A of FIG. 1, and FIG. It is a front view which removes and shows. The same or corresponding parts as those of the conventional sewage heat exchanger shown in FIG. 6 will be described with the same reference numerals. 1 to 3, the heat exchanger main body 23 includes a frame-shaped member 16 and lids 21 and 22. The frame-shaped member 16 is bridged between a pair of headers 17 and 18 arranged on both left and right sides and upper ends of these headers 17 and 18, and is integrated with the headers 17 and 18 by welding, for example. And a bottom plate 20 bridging between the lower ends of the headers 17 and 18 and integrally connected to the headers 17 and 18, for example, by welding. The opening 16A at the front part and the opening 16B at the rear part of the frame-shaped member 16 are sealed by lids 21 and 22 which are detachably attached by fastening members such as bolts not shown.

Between the top plate 19 and the bottom plate 20 of the frame-shaped member 16, a predetermined space is provided in the up-down direction, and the holes alternately extend from one header 17 toward the other header-18. A partition plate 25 for water corresponding to the header 17 or 18 on the opposite side is provided on the horizontal surface, and the outlet 12 of the sewage W formed on the bottom plate 20 from the inlet 12 of the sewage W formed on the top plate 19 is thereby provided. Over the course of 13, the sewage W is sequentially reversed to the flow in the forward and reverse directions (however, in the present embodiment, the rightward flow indicated by the solid arrow is the forward direction and the leftward flow indicated by the broken arrow is the reverse direction). A tunnel-shaped water passage 15 is formed in a zigzag shape to allow the fluid to flow. In addition, in each layer of the tunnel-shaped water passage 15, a heat medium passage 8 composed of a large number of tubes is arranged along the longitudinal direction, and both ends of the heat medium passage 8 in the axial direction are arranged. The part is open inside the pair of headers 17 and 18. On the other hand, a partition plate 26 for changing the flow direction of the heat medium is provided on the extension line of each of the holes 24 inside the headers 17 and 18, so that the inlet 10 of the heat medium F formed at the upper part of the header-18 is provided. The heat medium F is allowed to flow sequentially through the heat medium passage 8 to the outlet 11 of the heat medium F formed in the lower portion of the header-17.

A cleaning tool 27 is movably arranged by water pressure at the starting end position of each floor of the tunnel-shaped water passage 15. As shown in FIGS. 4 and 5, the cleaning tool 27 is composed of a frame member 28 and a plurality of brush-like cleaning bodies 29 rotatably supported by the frame member 28. The frame member 28 is composed of a pair of frame bodies 28A and 28B and a pair of side plates 28C and 28D detachably attached to both sides of the frame bodies 28A and 28B by fastening members such as bolts (not shown). It is placed on the upper surface of the water partition plate 25 so as to surround the heat medium passage 8 in each layer of the tunnel-shaped water passage 15 and move by water pressure. The plurality of brush-like cleaning bodies 29 are composed of a shaft 29A and a brush portion 29B formed of a wire brush, a hard resin brush, or the like, and each shaft 29A includes a plurality of tucks forming the heat medium passage 8. -Bubs are horizontally arranged through a gap in the upper and lower directions, and both ends thereof are rotatably supported by side plates 28C and 28D. The brush portion 29B is planted so as to extend radially from the entire circumference of the shaft 29A in the entire axial direction except both end portions supported by the side plates 28C and 28D. Therefore, the brush portions 29B come into contact with the respective tubes of the heat medium passage 8 from above and below. In the figure, 30 indicates a stopper.

With such a configuration, the heat medium F such as the flue gas introduced from the inlet 10 shown in FIGS. 1 to 3 is header-18 → multiplicity as shown by the one-dot chain arrow in FIG. The heat medium passage 8 composed of the tubes of the header, the header 17 and the heat medium passage 8 composed of a large number of tubes repeat the flow form and reach the outlet 11 and flow out. On the other hand, the sewage W introduced from the inlet 12 flows through the water passage 15 of the uppermost layer and drops from the hole 24 to the water passage 15 one step below, as shown by the solid line arrow and the broken line arrow described above. While flowing in the water passage 15 and further dropping from the hole 24 to the water passage 15 one step below, the water reaches the outlet 13 and flows out. Therefore, the sewage W is indirectly heat-exchanged with the heat medium F passing through the heat medium passage 8 in the process of flowing in the zigzag shape through the tunnel-shaped water passage 15. Moreover, since the flow forms of both the sewage W and the heat medium F flowing through the heat medium passage 8 interposed in the water passage 15 are counter flows, heat transfer is promoted and heat exchange efficiency can be improved.

On the other hand, the water pressure of the sewage W flowing in the tunnel-shaped water passage 15 in a zigzag manner is the frame 28A on the counterflow side of the cleaning tool 27 arranged at the starting end position S in each layer of the water passage 15. Or it is loaded on the counterflow surface at 28B. This water pressure causes the frame member 28 to move in the water passage 15 toward the terminal position G. By the movement of the frame member 28, the brush portion 29B of the brush-like cleaning body 29 shown in FIGS. 4 and 5 is brought into sliding contact with the surfaces of many tubes forming the heat medium passage 8 and is rotated together with the shaft 29A. While moving, the foreign matter adhering to the surface of the heat medium passage 8 is forcibly removed. The foreign matter removed from the surface of the heat medium passage 8 flows down together with the water W and is discharged from the outlet 13 of FIGS. 1 to 3.

On the other hand, when the sewage W is introduced from the outlet 13 when the heat exchanger is not in use at night or the like, the sewage W flows through the water passage 15 at the lowermost layer and the water passage 15 one step above the hole 24. The water flows up through the water passage 15 and reaches the inlet 12 and flows out while performing a zigzag movement in which the water flows from the hole 24 to the one-stage upper water passage 15. Therefore, the water pressure of the sewage W is applied to the counterflow surface of the counterflow side frame body 28A or 28B of the cleaning tool 27 arranged at the terminal position G in each layer of the water passage 15, and this water pressure causes the frame member to flow. 28 is moved toward the starting end position S. As a result, the brush portion 29B of the brush-like cleaning body 29 is brought into sliding contact with the surfaces of the many tubes forming the heat medium passage 8 and moves while rotating together with the shaft 29A. Forcibly remove the foreign matter adhering to the surface of the. The foreign matter removed from the surface of the heat medium passage 8 flows down together with the water W and is discharged from the inlet 12.

As described above, the frame member 28 is moved in the forward and reverse directions by the water pressure of the sewage W flowing in the tunnel-shaped water passage 15, and the cleaning medium 29 attached to the frame member 28 causes the heat medium passage 8 to move. Since the foreign matter adhering to the surface of the cleaning tool is automatically removed, the reverse movement operation of the cleaning tool 27, which is performed when the heat exchanger is not used at night, is relatively frequently performed. If so, virtually no foreign matter adheres to the surface of the heat medium passage 8. Of course, even if foreign matter is attached, it can be reliably and forcefully removed. Therefore, it is possible to avoid an increase in the flow resistance of the sewage W and a large increase in the boundary film thermal resistance caused by the foreign matter adhering to the surface of the heat medium passage 8, and to reliably prevent a decrease in heat exchange efficiency. Moreover, since the brush-like cleaning body 29 can be exchanged, it is possible to avoid a significant decrease in cleaning power caused by abrasion or deformation of the brush portion 29B. Therefore, foreign matter can always be reliably removed with excellent cleaning power.

[0017]

[Effect of the device]

 As described above, in the invention of claim 1, the frame member is moved together with water in the water passage, and the cleaning body attached to the frame member is slidably brought into contact with the surface of the heat medium passage so that the heat medium passage Since foreign matter adhering to the surface can be forcibly removed, the heat exchange efficiency is reduced by avoiding an increase in the flow resistance of water and a significant increase in the film thermal resistance caused by the adhesion of foreign matter. Can be reliably prevented.

Further, according to the second aspect of the present invention, the periodical replacement of the cleaning body can avoid a significant decrease in the cleaning power caused by wear or deformation of the cleaning body. Therefore, foreign matter can be reliably removed with excellent cleaning power at all times.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a sewage heat exchanger to which the present invention is applied.

FIG. 2 is an enlarged vertical side view taken along the line A-A in FIG.

FIG. 3 is a front view showing front and rear lids removed.

FIG. 4 is an enlarged side view of the cleaning tool.

5 is a vertical sectional front view taken along the line EE of FIG.

FIG. 6 is a vertical sectional view showing a conventional sewage heat exchanger.

[Explanation of symbols]

 8 Heat Medium Passage 10 Heat Medium Inlet 15 Tunnel-shaped Water Passage 27 Cleaning Tool 28 Frame Member 29 Brush-shaped Cleaning Body (Cleaning Body)

Claims (2)

[Scope of utility model registration request] 1. A tunnel-shaped water passage for flowing water,
A washing tool for a heat exchanger, comprising: a heat medium passage formed by a plurality of tubes arranged along the longitudinal direction of the water passage in the water passage; A frame member that surrounds the heat medium passage and is movably arranged by water pressure, and a cleaning body that is attached to the frame member and is brought into sliding contact with the surface of the heat medium passage by the movement of the frame member are provided. A heat exchanger cleaning tool characterized by the above. 2. The cleaning tool for a heat exchanger according to claim 1, wherein the cleaning body is replaceably attached to the frame member.