JPH0371638B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a tube cleaning device for a heat exchanger, and in particular, a tube is provided with a storage container at both ends, and the inside of the tube is cleaned with a cleaning material such as a brush or a sponge ball. The inner wall of the tube can be cleaned by moving the cleaning material back and forth while changing the direction of the internal fluid flow between the forward and reverse directions using a valve provided at the inlet and outlet of the heat exchanger. This invention relates to a tube cleaning device for a heat exchanger.

[Conventional technology]

Conventionally, cleaning material storage containers are installed in the water chambers on both sides of the heat exchanger to store cleaning materials, but these storage containers are attached to both ends of each tube, and it is necessary to prevent the storage containers from coming off the tubes. Various mounting methods are used. The most common methods are adhesive or tube expansion. This method will be explained below based on the drawings.

In FIG. 11, tube 2 in heat exchanger 1
is attached to the tube plate 3 by a method such as tube expansion.
There are water chambers 4 at both ends of the heat exchanger, and the fluid flows through the water chambers 4.
The water flows into the tube, passes through the tube 2, and flows out from the water chamber on the opposite side. Storage containers 5 are attached to both ends of the tube 2 by adhesive or tube expansion.
A tube cleaning material 6 is stored inside. 1st
In the figure, since the flow direction of the fluid in the tube is rightward in the drawing, 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, flows from the tube 2 to the container 5 on the right side of the tube, and flows out into the water chamber 4 on the right side through the small holes 51 and 52 of the container. (The structure on the left side of the heat exchanger is the same as the right side and is not shown.) By switching a valve (not shown) connected to the inlet and outlet of the water chamber of the heat exchanger, the flow direction can be reversed to the left. For example, the cleaning material 6 is pushed out of the container by the fluid that enters from the small hole 52 at the right end of the container 5 and is pushed into the tube 2.
The fluid enters the tube 2 from behind, and while cleaning the inner wall of the tube, it is transferred to and held in a container similarly installed in the water chamber (not shown) on the opposite side.

The method of installing the storage container as described above takes a lot of effort and is unreliable, causing problems such as cracking due to excessive tube expansion, or coming off due to insufficient tube expansion, and damage to the internal cleaning material. However, it was difficult to replace it if it were to be replaced. In addition, since the container is inserted and fixed into the inner surface of the tube, the flow path is reduced by the thickness of the insertion portion of the container, which increases the flow velocity and increases water head loss, causing erosion corrosion.

Another method is to make the end of the container a separate elastic structure so that only the end can be removed. With this method, the cleaning material can be replaced, but the main body of the container can be glued or expanded. However, the disadvantages of gluing and tube expansion cannot be avoided, especially when there are a large number of tubes.

Furthermore, in order to avoid such drawbacks, a method is disclosed in Japanese Patent Application Publication No. 2003-100010 in which the container 5 is supported by a holding plate fixed apart from the tube sheet 3 and the end of the container inserted into the opening of the tube sheet. It is described in Publication No. 58-145896 (corresponding to U.S. Pat. No. 4,398,592).

The method described in the publication will be explained based on FIG. 12. The holding plate 7 fixed apart from the tube sheet 3, the container end 53 inserted into the tube sheet opening, and A method is described in which the storage container 5 is supported by an annular protrusion 54 provided at the end of the storage container 5 on the tube seat side.

In addition, the other embodiments described in the publication are
To explain based on FIG. 3, there are screws provided in the holes of the retaining plate 7 fixed apart from the tube sheet 3, and a threaded portion 56 provided on the outer periphery of the container 5.
With the fixing part fitted with and the container end 53 inserted into the tube seat opening of the container 5,
A method of supporting the storage container 5 is described.

These methods have the advantage that the storage container can be installed more securely and with higher reliability than the prior art described above, but they do
As described in line 4 of the lower right column, the holding plate 7 and the tube sheet 3 are separated, so a pool of liquid occurs between them, and in order to eliminate this pooling, the holding plate 7 has the drawbacks that the structure is restricted, which increases the cost, and that it is not possible to reliably eliminate the pooling of liquid, which causes troubles such as corrosion of the tube seat caused by the pooling of liquid. In addition, since there is a gap between the tube sheet and the holding plate, when tightening the holding plate 7 to the tube sheet 3 with the bolts 8, care must be taken not to bend the plate due to over tightening. There was a drawback that great care was required to maintain the end portion 55 of the container 5 inserted into the opening of the container 3 with uniform pressure. In addition, since the end of the storage container 5 is connected to the inner surface of the tube in a nested manner, the disadvantages such as corrosion due to erosion due to the reduction of the flow path and increased water head loss, as described above, are eliminated. Not yet.

Further, in the example shown in FIG. 12, the storage container 5 slidably penetrates the holding plate hole 71.
In this case, there is no problem after it is attached to the tube sheet (tube sheet) 3. When connecting to the tube sheet 3, if the shoulder side 55 of the tubular protrusion 54 of the storage container is facing downward, the storage container 5 will be retained. It has the disadvantage that it comes off from the plate 7, and requires great care during installation.

[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.

[Structure 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 moving the cleaning material back and forth 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 in the holding plate so that the storage container is placed on the opposite side of the tube; (3) the retaining plate is attached tightly to the tube plate, and (4) the hole portion of the tube side surface of the retaining plate is
A device for cleaning tubes of a heat exchanger, characterized in that it has an insertion allowance into which a protruding portion of the tube protruding outward from a tube plate can be inserted.

Next, the present invention will be explained based on the drawings. 1st
The figure shows one embodiment of the present invention, in which a stepped hole 72 is machined in the holding plate 7 of the container 5, and the tube side end 53 of the container 5 has a stepped hole 72 formed therein.
It has a structure that fits into 2. 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 53 of the storage container, as shown in the figure. The stepped part of the storage container has a space for inserting a water tube.

The holding plate 7 holding the storage container 5 is tightly attached to the tube plate 3 with bolts 8 using screw holes 81 in the tube plate, and is removably fixed. The diameter and depth _l1 of the tube insertion allowance are set so as to cover the longitudinal tolerance of general heat exchangers from 0 to 5 mm.
In addition, the anti-rust coating inside the water chamber reduces the unavoidable coating thickness on the outer surface of the protruding tube and the tube hole pitch tolerance of ±
It is desirable to set the necessary dimensions to allow approximately 0.5 mm.

In Fig. 1, the tube cleaning material 6 is shown as having a sponge around the central rod, but it may also be a brush-like material as shown in Fig. 11 or a sponge around the rod as shown in Fig. 13. Any shape may be used, such as one provided with a coil spring.

FIG. 2 shows another embodiment, in which the insertion allowance 7 of the tube 2 protrudes from the tube side end of the holding plate 7.
As shown in the figure, one end of the storage container 5 is threaded, and the holding plate 7 is fitted to the holding plate 7 by threaded connection. In this case, even after the retaining plate 7 is tightly attached to the tube plate 3 with the bolts 8, the storage containers 5 can be attached to the retaining plate 7, and the storage containers 5 can be removed individually. .

FIG. 3 shows the structure of a storage container that is an improved version of the 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, has a certain length l ₂ from the tube side end (see Figure 4).
A holding protrusion 57 is provided at the position shown in FIG. It is designed to protrude outward from the hole and prevent it from falling out. This protrusion 57 has the function of not only preventing the holding plate from coming off when it is attached, but also preventing lateral sway after the storage device is installed.

FIG. 4 shows a side view of the container shown in FIG.
Reference numeral 57 indicates a holding protrusion, and 58 indicates a slit for liquid entry and exit. Further, FIG. 5 shows a sectional view of the container taken along the line A--A in FIG. 3.

Also, instead of providing a storage space for the tube on the tube end side of the storage container shown in FIGS. 3 to 5, the tube side end of the storage container is folded as shown in FIGS. 6 to 8. Folded end 59 and protrusion 5
7 and may be held between the holding plates.

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

FIG. 9 shows a modification of the container 5 shown in FIGS. 3 to 5, in which the shape of the container 5 has a bulged middle part as shown in the figure, and when inserted into the retainer plate 7,
It is compressed and pushed in to match the hole diameter of the holding plate, and after fitting into the holding plate, it expands outward to ensure that it is tightly held against the holding plate, and this swelling prevents it from coming off. It is. In this embodiment, the retaining plate is held tightly against the tube plate 3 by bolts 8 using screw holes formed in an auxiliary plate 41 projecting into the water chamber 4. This method is used when it is not possible to tap screws into the tube plate 3. FIG. 10 shows yet another embodiment in which the holding plate 7 and the storage container 5 are molded all at once from the same mold, or the holding plate and the storage container are made separately and bonded together by welding or the like. This shows the case of molding. In this case, since the container does not come off, it is possible to securely attach it to the tube plate 3 after attachment.

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

〔Effect of the invention〕

The present invention brought about 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 storage container to the holding plate, the storage device can be mounted securely and reliability can be improved.

Since the retainer 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 retainer plate or bending of the plate when attaching the retainer plate, allowing for reliable and strong installation. .

Even for tubes that protrude from the tube plate, the retainer plate can be attached as is without the need for tube end processing (cutting), providing greater 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. This makes it easier to attach the storage container to the holding plate, and the attachment of the storage container to the holding plate becomes more reliable.

[Brief explanation of drawings]

1, 2, 3, 6, 9, and 10 are sectional views showing how the container of the present invention is attached to the tube plate, and FIG. 4 is the sectional view shown in FIG. 3. 5 is a sectional view of the container taken along line A-A in FIG. 3, FIG. 7 is a side view of the container shown in FIG. 6, and FIG. 8 is a cross-sectional view of the container shown in FIG. 6. 11, 12 and 13 are cross-sectional views of the storage container taken along line A-A.
The figure 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... Water chamber, 5... Storage container, 6... Tube cleaning material, 7... Storage container holding plate.

Claims (1)

[Scope of Claims] 1. A device for cleaning the inner wall of the tube by providing a container for a tube cleaning material 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 is (3) the retaining plate is attached tightly to the tube plate, and (4) the hole portion of the retaining plate on the side of the tube is
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 protruding outward from a tube plate can be inserted. 2. The hole of 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 to prevent the storage container from coming off toward the opposite side of the tube. ,
2. The device according to claim 1, wherein the tube-side end of the housing tube 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. The container is made of an elastic structure,
The device according to claim 1 or 2, further comprising a retaining piece provided on the outer surface of the container to improve fitability to the holding plate and prevent it from coming off toward the tube side. 7. The retaining piece is a protrusion provided on the outer surface of the container, and after inserting the protrusion into the holding plate from the tube side while recessing the protrusion inward, this protrusion and the latch provided on the end of the tube side of the container are connected. 7. The device according to claim 6, wherein the storage container is mounted so as to sandwich the holding plate between the parts. 8 The anti-tube side of the storage container has an outer diameter larger than the diameter of the hole provided in the retaining plate, and when it is fitted into the retaining plate, it is recessed, and after fitting, it is restored to its original diameter, thereby forming the retaining plate hole. 8. The device according to claim 6 or 7, wherein the container is fitted into the container.