JPS61184398A - Tube cleaning device in heat exchanger - Google Patents

Abstract

PURPOSE:To prevent foreign materials from being accumulated, avoid an increasing of flowing resistance or a poor operation of a cleaning member by a method wherein the water chamber having a storing unit mounted therein is provided with a blow valve for use in performing a direct discharging of a part of the fluid in the water chamber when a flowing direction of the fluid in the tube is reversed. CONSTITUTION:A heat exchanger 1 has at its left end a water chamber 4 divided into the sections A and C and at its right end a water chamber 4' and tubes 3 communicate the sections A and C of the water chamber 4 with the upper and lower sections B2 and B1 of the water chamber 4' so as to form a so-called two-bath type unit. Both ends of the tubes 3 are provided with storing parts 5 for storing the cleaning materials 6. The water chamber 4' is fixed with a blow valve 13. This blow valve 13 is released open when the flowing direction of the fluid is to be changed over and discharges directly, the foreign materials peeled off from the storing chamber 5 and the cleaning materials 6 together with the flowing fluid and entered the water chamber 4'.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a container for cleaning material at both ends of a tube opening into the water chamber of a heat exchanger, and uses the pressing force of the internal fluid to store the cleaning material. The present invention relates to a tube cleaning device for a heat exchanger that cleans the inner wall of the tube while moving the tube inside the tube.

[Conventional technology]

A heat exchanger transfers heat between two fluids flowing inside and outside a tube whose ends are temporarily fixed as pipes, cooling one fluid and heating the other fluid. It is easy to accumulate, and when foreign matter accumulates, the efficiency of heat exchange decreases significantly.

Therefore, tube cleaning material is stored in containers provided at both ends of the tube that enters the water chamber of the heat exchanger, and the cleaning material is moved back and forth within the tube periodically or at any time using the power of the internal fluid. It is common practice to clean the inner wall of the tube.

For example, as shown in FIG.
is attached to the tube plate 2 by a method such as tube expansion. There are water chambers 4 at both ends of the heat exchanger l, and fluid flows into the water chambers 4, passes through the tubes 3, and exits from the water chamber on the opposite side. A storage container 5 is attached to both ends of the tube 3 by a holding plate 7, and a tube cleaning material 6 is stored in the storage container 5.

In FIG. 2, since the flow direction of the fluid in the tube is rightward in the drawing, the cleaning material 6 is stored in the right storage container 5. Further, the flow flows from the left side to the right side in the figure, from the tube 3 to the container 5, and flows out from the small hole 51 of the container 5 into the water chamber 4 on the right side. The left water chamber is not shown.

If the flow direction is reversed to the left by switching the valve (not shown) connected to the inlet/outlet of the water chamber of the heat exchanger, the cleaning material 6 leaves the container 5 and flows inside the tube 3 while cleaning its inner wall. , is held in a storage container similarly mounted within the water chamber (not shown) on the opposite side (left side).

[Problem that the invention seeks to solve]

However, in a heat exchanger l equipped with this type of tube cleaning device, the fluid passing through the tubes 3 is generally very dirty and contains a large amount of foreign matter. When the heat exchanger l is operated for a long time using such a fluid, foreign matter will adhere to the storage container 5 and the cleaning material 6.The flow direction of the internal fluid will be switched, and the foreign matter will be removed by the cleaning process. When the material 6 moves, it often peels off.

However, the separated foreign matter is likely to be captured by the storage container 5 or the cleaning material 6 on the downstream side, and in the end, the foreign material simply moves back and forth between the storage containers at both ends of the tube within the water chamber when the flow direction is reversed. become. As this situation continues, the amount of foreign matter attached to or captured by the storage container 5 and the cleaning material 6 increases, flow resistance increases, the fluid flow becomes poor, and the movement of the cleaning material also becomes poor. It's coming. A similar phenomenon is observed between the water chamber and the switching valve.

When the flow direction of the fluid in the tube is reversed to clean the heat exchanger, the present invention eliminates the accumulation of foreign matter by directly discharging foreign matter that has peeled off from the container or cleaning material to the outside as quickly as possible. The purpose of increasing the flow resistance is to prevent malfunction of the cleaning material.

[Means and effects for solving the problems] As a means for solving the above problems, the present invention provides a container for cleaning material at both ends of a tube that opens into the water chamber of a heat exchanger, and stores the cleaning material therein. In a tube cleaning device for a heat exchanger that cleans the inner wall of the tube by reciprocating the inside of the tube using the pressing force of the internal fluid, the flow direction of the fluid in the tube is reversed in the water chamber in which the storage container is installed. The present invention aims to provide a tube cleaning device for a heat exchanger, which is equipped with a blow valve that directly discharges a portion of the fluid in the water chamber to the outside. Every time the flow direction is reversed, part of the foreign matter separated from the container and/or cleaning material is immediately discharged from the water chamber to the outside of the heat exchanger,
The amount of foreign matter reaching other containers or switching valves in the same water chamber, or passing through the tube and reaching the container on the opposite side can be significantly reduced.

〔Example〕

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

FIG. 1 shows a longitudinal sectional view of an embodiment of the present invention, in which the heat exchanger 1 has a water chamber 4 divided into parts A and C at the left end and a water chamber 4' at the right end, and a tube 3 This is a so-called two-pass type device in which portions A and C of the water chamber 4 are communicated with upper and lower portions B2 and B of the water chamber 4°, respectively. At both ends of the tube 3, storage containers 5 for storing cleaning materials 6 are provided. Parts A, C of the water chamber 4 are each connected by a pipe 8.9 to a four-way valve 10, which is connected by a pipe 11.12 to a four-way valve 10.
It communicates with a fluid pressure source and a drain port (not shown), respectively. In the illustrated state, the fluid flows as indicated by solid arrows, and the cleaning materials 6 are stored in the containers 5 in portions B+ and C, respectively. Therefore, when the four-way valve 10 is switched as shown by the dotted line, the fluid flows in the opposite direction as shown by the dotted line arrow, and at this time, the cleaning material 6 pushed by the fluid moves while cleaning the inside of the tube 3, and the two cases of AlB are stored. It is stored in container 5.

By the way, when the flow direction is switched from the illustrated state, the foreign matter separated from the cleaning material 6 and the inner wall of the tube moves, for example, inside the tube 3 and reaches part 82. However, this foreign material cannot enter the tube 3 from B, and even if it enters the tube 3, it is difficult to pass through the four-way valve 10. Therefore, no matter how many times the four-way valve 10 is switched, the foreign material within the water chamber 4° , part B
It is difficult to be discharged just by going back and forth between 1 and 82, and the amount will gradually increase. If the machine is operated in this way for a long period of time, the Bl, 82 portion will actually promote the accumulation of foreign matter. Similarly, foreign matter accumulates in portions C and A.

In this embodiment, a blow valve 13 is attached to the water chamber 4''. This blow valve I3 is opened when the fluid flow direction is changed, and the blow valve I3 is opened when the flow direction of the fluid is changed, and the blow valve I3 is opened when the fluid flow direction is changed, and the blow valve I3 is opened when the flow direction of the fluid is changed. Foreign matter that is peeled off and enters the water chamber 4' is directly discharged to the outside.

This blow valve 13 includes each part A1B of the water chamber 4.4",
, B, , and C may be provided, but in a two-bath type heat exchanger such as the one described above, foreign matter is particularly likely to stagnate in the water chamber 4's B, , , 81 portion. Significant effects can be expected just by providing it. In addition, when the blow valve 13 is opened, when the flow is reversed, the cleaning material 6 moves and foreign matter adhering to the storage container 5 and the cleaning material 6 is peeled off. It is a good idea to start opening the . Since peeling is completed within several minutes, 10 minutes at most is sufficient.

In order to promote the separation of foreign matter from the container 5, mechanical or ultrasonic vibration 9J+ is applied to the container 5 or the tube plate 2 to which the container 5 is attached when reversing the flow of the fluid. It is even more effective.

〔Effect of the invention〕

According to the present invention, when the flow direction of the fluid is switched, the foreign matter attached to the container or the cleaning material can be directly flowed out from the blow valve that is opened together with the inflowing fluid, and the heat exchange efficiency is improved due to the accumulation of foreign matter. can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional side view of the main part of a conventional heat exchanger.

Claims (1)

[Claims] 1. A container for tube cleaning material is provided at both ends of the tube that opens into the water chamber of the heat exchanger, and the cleaning material is reciprocated within the tube using the pressing force of the internal fluid to generate heat for cleaning the inner wall of the tube. In the exchanger tube cleaning device, the water chamber in which the storage container is installed is provided with a blow valve that directly discharges a part of the fluid in the water chamber to the outside when the flow direction of the fluid in the tube is reversed. A heat exchanger tube cleaning device featuring: