JPS61213498A - Tube cleaning device for heat exchanger - Google Patents

Abstract

PURPOSE:To improve a reliability of fixing by a method wherein side ends of the tubes in a container are fitted to the holes of the holding plates, which are closely fixed to the pipe plates by utilizing the threaded holes of the pipe plates and the holes at the side surfaces of the tubes of the holding plates having insertion margins into which the projected portions of the tubes can be inserted. CONSTITUTION:Stepped holes 72 are made at the holding plates 7 in a container 5 and the container 5 is made as a structure in which the tube end portions 53 are fitted to the stepped holes 72. A relation between stepped holes 72 of the holding plates and the tubes 2 at the end portions 53 of the container is made such that the portions where the tubes 2 are projected from the pipe plates can be inserted into the openings at the end portions 53 of the container and the insertion margins for the tubes are arranged at the stepped portions of the container. The holding plates 7 holding the container 5 are closely fitted to the pipe plates 3 by bolts 8 by utilizing the threaded holes 81 in the pipe plates and they are removably fixed. The tube cleaning materials 6 are illustrated to have some sponges around the central rods and any configuration of the brushes or the like can be used.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tube cleaning device for a heat exchanger, and in particular, a storage device is provided at both ends of the tube, and a cleaning material such as a metal brush or a sponge ball is provided inside the tube. In a device that cleans while moving, the direction of the internal fluid flow is changed between the forward and reverse directions using the pulp provided at the total heat exchanger inlet and outlet, and the cleaning material is reciprocated to clean the inner wall of the nine tubes. This invention relates to a cleaning device for cleaning tubes of a heat exchanger.

[Conventional technology]

Conventionally, to store cleaning materials, a cleaning material storage container is coated with gold film inside the water chamber on both sides of the heat converter, but this storage container is attached to both ends of each tube, and when the storage container is detached from the tube. Various mounting methods are used to avoid this problem. The most common methods are adhesive or tube expansion.

This method will be explained below based on the drawings.

@ In Figure 11, the tube 2 in the heat converter 1 is connected to the tube plate 3.
It is installed by pipe expansion, etc. There are water chambers 4 at both ends of the heat exchanger, the fluid flows into the water chambers 4 and the tubes 2
It flows through the inside and out to the icehouse on the other side. A storage container 5 is attached to both ends of the tube 2 by adhesive or tube expansion, and a tube cleaning material 6 is stored in the storage container 5. In FIG. 1, the flow direction of the fluid in the tube is rightward in the drawing, so the cleaning material 6 is stored in the container 5 on the right side. The fluid flows from the left side to the right side as shown by the arrow \ in the figure, from tube 2 to the storage container 5K on the right side of the tube.
It flows out into the ice chamber 4 on the right side from the small holes 51 and 52 of the storage container. (The structure on the left side of the heat exchanger is the same as the right side and is not shown in the figure.) By switching the pulp (not shown) connected to the inlet and outlet of the icebox of the heat exchanger, the flow direction can be reversed to the left. The cleaning material 6 is pushed from the container by the fluid entering the small hole 52 at the right end of the container 5 and enters the tube 2, and is pushed inside the tube 2 by the fluid from behind, cleaning the inner wall of the tube. ,
The water is transferred to and held in a storage container installed in the same way in the water chamber on the opposite side (not shown). This resulted in problems such as cracks occurring due to excessive tube expansion, and problems such as the tube coming off due to insufficient tube expansion, and it was difficult to replace the internal cleaning material if it was damaged.Also, the storage container was inserted and fixed into the tube inner surface. As a result, the flow path is reduced by the thickness of the insertion part of the container, increasing the flow velocity and increasing the water head loss, causing erosion corrosion.

There is also a method of making the end of the storage container a separate elastic structure so that only the end part can be removed, but with this method it is possible to replace the cleaning material, but it is not possible to replace the cleaning material with an adhesive type or expanded tube on the storage container body. This requires a special method to attach the tubes, which requires more effort especially when there are a large number of tubes, and it is not possible to avoid the disadvantages of gluing and expanding the tubes.

In order to avoid such drawbacks, a method of supporting the storage container 5 by a holding plate fixed apart from the tube sheet (tube sheet) 3 and an end of the storage container inserted into the opening of the tube sheet is disclosed in Japanese Patent Application. Publication No. 58-145896 (U.S. Patent No. 4
, 598, 592).

To explain the method described in the publication based on FIG. 12, the holding plate 7 fixed apart from the tube sheet (tube sheet) 3, the storage container end 53 inserted into the tube sheet opening, and the storage A method for supporting the rainbow storage container 5 on an annular protrusion 54 provided at the tube sheet side end of the container 5 is described.

Further, another embodiment described in the publication will be explained based on FIG. A fixing part fitted with a threaded part 56 provided on the outer periphery and the container end 5 inserted into the tube sheet opening of the container 5.
5 describes a method of supporting the storage container 5.

As mentioned earlier, these methods have the advantage that the storage container can be installed more securely and with higher reliability than the conventional techniques, but they do not have the advantage of ensuring that the storage container is installed more securely and with higher reliability than the conventional techniques. As described in the above, since the holding plate 7 and the tube sheet (tube sheet) 3 are separated, a pool of liquid occurs between them, and in order to prevent this pooling, there are restrictions on the structure of the holding plate 7. This often leads to problems such as corrosion of the tube sheet caused by the accumulation of liquid, since it is not possible to eliminate the accumulation p reliably. Also, since there is a trap gap between the tube sheet and the retaining plate, the retaining plate 7
When tightening the T-bolts 8 to the tube sheet 3, care must be taken to avoid bending the plate 9 due to over-tightening.
Also, a storage container 5 inserted into the opening of the tube sheet 3
There was a drawback in that great care was required to maintain the end portion 53 of the holder with uniform pressure. Also, in order to connect the end of the container 5 to the inside of the tube and connect it to the puppy, the 1g-
The shortcomings of sea urchins, such as corrosion due to erosion due to the reduction of the flow path and increased water head loss, have not yet been resolved.

Further, in some examples shown in FIG. 12, the storage container 5 passes through the holding plate hole 71 in a slidable manner, but in this case, there is no problem after attachment to the tube sheet (tube plate) 5. \、
When connecting to the tube sheet 3, the tubular protrusion 5 of the storage container
When the shoulder side 55t of 4 is facing downward, the storage container 5 is attached to the holding plate 7.
There was a drawback that the receptacle could come off, and a great deal of care was sometimes required to install it.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tube cleaning device having a storage container that is highly reliable in installation and easy to install and remove, in order to eliminate the above-mentioned conventional drawbacks.

[The bottom of the invention]

The present invention provides an apparatus for cleaning the inner wall of the tube by installing tube cleaning material storage containers at both ends of the tube of a heat exchanger and reciprocating the cleaning material within the tube using the pressure of the internal fluid. 1) a holding plate having a hole for holding a storage container corresponding to the tube plate hole; (2) a tube-side end of the storage container is inserted into the hole of the holding plate so that the storage container faces away from the tube; (3) the retaining plate is attached to the tube plate in close contact with the tube plate; and (4) the hole portion of the tube side surface of the retaining plate is
A cleaning device for a tube of a heat exchanger is characterized in that it has an insertion allowance that allows the entire protruding portion of the tube that protrudes outside the tube plate to be inserted.

Next, the present invention will be explained based on the drawings. FIG. 1 shows one embodiment of the present invention, in which a holding plate 7 of a storage container 5 is shown.
A stepped hole 72 is machined in the housing 5, and the tube side end portion 53 of the container 5 has a structure that fits into the stepped hole 72. The relationship between the stepped hole 72 of this holding plate and the tube 2 of the end 53 of the storage container is such that the portion of the tube 2 protruding from the tube plate is inserted into the opening of the end 55 of the storage container, as shown in the figure. The stepped part of the storage container has a space for inserting the urinating tube.

The retaining plate 7 holding the storage container 5 is fixed to the tube plate 3 by making use of the screw holes 81 in the tube plate and closely contacting the bolts 8 with the edges thereof, and when it is removed.

The diameter and depth tl of the insertion allowance of the tube should be able to cover the longitudinal tolerance of a general heat converter from 0 to 5 mf;
Furthermore, it is desirable that the anti-rust coating inside the water chamber be made to a size that is necessary to allow for the thickness of the coating on the outer surface of the protruding tube and the tube hole pitch tolerance of approximately ±α5.

In FIG. 1, the tube cleaning material 6 is shown as having a sponge around a central rod, but l! 11
Any shape may be used, such as a brush-like shape as shown in the figure or a shape with a coil spring attached to the swivel of the rod as shown in FIG.

FIG. 2 shows another embodiment, in which an insertion allowance 72 for the protruding tube 2 is provided at the tube side end of the holding plate 7, and one end of the storage container 5 is threaded as shown in the figure, and the holding plate 7 has an insertion allowance 72 for the tube 2. The fitting with the plate 7 is a screw connection. In this case, the storage containers 5 can be mounted on the holding plate 7 even if they are attached to the tube plate 3 in close contact with the retaining plate 7 with the bolts 8, and the storage containers 5 can be removed individually. be.

FIG. 3 shows the structure of a storage container that is an improved version of the first embodiment shown in FIG. 1 described above. The storage container 5 is an elastic structure made of synthetic resin or the like, and as shown in the figure, a holding protrusion 57t is provided at a certain length t3 (see FIG. 4) from the tube side end of the holding plate 7. The storage container is inserted from side 1, and at this time, the protrusion is pushed inward, and after insertion, the protrusion comes out from the hole in the holding plate 7 to prevent it from being removed. This protrusion 57 has the function of not only preventing the holding plate from being removed when the holding plate is attached, but also acting as a lateral sway preventer after the storage device is attached.

1 to 4 show side views of the container shown in FIG.
7 indicates a holding protrusion, and 58 indicates a slit for liquid entry and exit.

Further, FIG. 5 shows a sectional view 1 of the container taken along the line A--A in FIG.

Also, Figures 5 to 1! Instead of providing a chip holder on the tube end side of the holder shown in Fig. 5, the tube side end of the holder is folded as shown in Figs. 59 and the protrusion 57 may be used to hold the holding plate.

7 shows a side view of the container shown in FIG. 6, and FIG. 8 shows a cross-sectional view of the container taken along the line A--A in FIG. 3.

FIG. 9 shows a modification of the storage container 5 shown in FIGS. It is shrunk and pushed in according to the hole diameter of the plate, and after fitting into the holding plate, it expands outward and is securely held tightly against the holding plate, and this swelling prevents it from being pulled out. This is what I did. In this embodiment, the retaining plate is formed into an auxiliary plate 41 that protrudes into the water chamber 4, and is held in close contact with the tube plate 5 by bolts 8 using nine screw holes. This method is used when it is not possible to tap a screw into the tube plate 3. FIG. 10 shows still another embodiment, in which the holding plate 7 and the storage container 5t are molded all at once from the same mold, or the holding plate and the storage container are made separately and bonded by welding or the like. This shows the case where the sheet is integrally molded.

In this case, since the container does not come off, it is possible to reliably attach it to the tube plate 5 later.

Further, this figure shows another embodiment as a method of attaching the retaining plate to the tube sheet. This can be used when the water chamber 4 and tube plate S are attached by 7 lunges on the tube plate side as shown in the figure, and the retaining plate 7 is sandwiched between the tube plate 3 and the water chamber 4. Then, the bolts 80 are attached tightly to the tube sheet. The mounting shown in FIGS. 1 to 3 on the outside of the tube plate is effective when there is no space for the bolts 8.

〔Effect of the invention〕

The present invention has the following effects as shown in the above-mentioned examples.

■ The storage container can be easily installed and removed, improving work efficiency.

■ By fitting the container to the holding plate, the container can be installed securely and reliability is improved.

■ Since the retaining plate is in close contact with the tube plate, there is no need to be careful about liquid pooling in the gap between the tube plate and the backing plate, and there is no need to be careful about the plate bending when installing the retainer plate, ensuring a secure and strong installation. It is possible.

■ Even for tubes that protrude from the tube sheet, the retainer plate can be attached as is without the need for tube end processing (cutting), providing great flexibility.

■ When the container is made of an elastic structure, the container can be provided with a protrusion or have a structure in which the middle part is bulged, so that it will not fall off after being inserted into the retainer plate, making it easier to attach it to the tube plate. Attaching the container to the holding plate is easier and the storage container can be more securely attached to the holding plate.

[Brief explanation of the drawings] M1 diagram, Figure 2, wEs diagram, Figure 6, Figure g9, and Figure 10.
Figure 4 is a side view of the storage container shown in FIG. 3, and FIG. 5 is a sectional view showing how the storage container of the present invention is attached to the tube plate. 7 is a side view of the container shown in FIG. 6, FIG. 8 is a sectional view of the container taken along line A-A in FIG. 6, and FIG. 11, FIG. 12, and FIG. FIG. 13 is a sectional view showing how a conventional storage container is attached to a tube plate. 1...Heat exchanger, 2...Tube, 3...Tube plate, 4...
Ice room, 5. Storage container, 6. Tube cleaning material, 7. Storage container holding plate.

Claims (1)

[Claims] 1. A container for cleaning material is provided at both ends of the tube of the heat exchanger, and the cleaning material is moved back and forth within the tube using the pressure of the internal fluid to clean the inner wall of the tube. The apparatus includes: (1) a holding plate having a hole for holding a storage container corresponding to a tube plate hole; (2) a tube side end of the storage container is inserted into the hole of the holding plate so that the storage container is inserted into the hole in the holding plate; (3) the retaining plate is attached tightly to the tube sheet, and (4) the hole portion of the tube side surface of the retaining plate is fitted so that it does not come off on the side opposite to the tube. A cleaning device for a tube of a heat exchanger, characterized in that the device has an insertion allowance into which a protruding portion of the tube that protrudes further to the outside can be inserted. 2. The hole in the holding plate has a large step structure on the side surface of the tube, and the tube side end of the storage container is fitted into the step so that the storage container does not come off toward the side opposite to the tube. 2. The device according to claim 1, wherein the tube-side end of the container has an insertion allowance into which a protruding portion of the tube protruding outward from the tube plate can be inserted. 3. The device according to claim 1, wherein the storage container is fitted to the holding plate by screw connection. 4. The device according to claim 1 or 2, wherein the holding plate and the storage container are integrally constructed. 5. The device according to claim 4, wherein the holding plate and the storage container are integrally formed by adhesion or welding. 6. Claim 1, wherein the storage container is made of an elastic structure, and a retaining piece is provided on the outer surface of the storage container to improve fitability to the holding plate and prevent it from coming off toward the tube side. The device according to paragraph 2 or paragraph 2. 7. The retaining piece is a protrusion provided on the outer surface of the container,
After inserting this projection into the holding plate from the tube side while recessing it inward, the storage container is installed so that the holding plate is held between this projection and the hook provided at the tube side end of the storage container. 7. The device according to claim 6. 8. The side opposite to the tube of the storage container has an outer diameter larger than the diameter of the hole provided in the retainer plate, and when it is fitted into the retainer plate, it is recessed, and after it is fitted, it is restored to its original diameter, thereby making the retainer plate 8. The device according to claim 6, wherein the container is fitted into the hole.