JPH0233040Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a cleaning device for heat exchangers, and in particular, a chemical hose through which the chemical solution of the cleaning device circulates can be attached to the heat exchanger tube of the heat exchanger with one touch. The present invention relates to a cleaning device equipped with a detachable connection mechanism.

[Prior Art] In order to clean the inner surfaces of heat exchanger tubes, a cleaning device for heat exchangers connects and communicates a chemical tank containing a chemical solution with openings at both ends of the heat exchanger tubes through a chemical hose. Although the chemical solution is configured to be forcedly circulated by a pump or the like, the connection mechanism between the chemical solution hose and the heat transfer tube is fixedly connected so as to withstand the feeding pressure of the chemical solution, etc. to be forcedly circulated. However, this structure does not allow for easy attachment and detachment of the chemical solution hose.

[Problems to be solved by the invention] When cleaning the heat exchanger tubes of a heat exchanger using the cleaning device, it is necessary to exchange and circulate two or more types of chemical solutions or to clean the inside of the heat exchanger tubes during cleaning. In order to increase cleaning efficiency by brushing, it has become necessary to repeatedly attach and detach the chemical hose from the heat transfer tube depending on the process. Therefore, especially when cleaning multiple heat transfer tubes in a shell-and-tube heat exchanger at the same time, the connection mechanism for the chemical hose has a structure that prevents leakage of the chemical and allows for easy connection and removal with one touch. It is preferable that the material is moist. However, in conventional cleaning equipment for heat exchangers, the connection mechanism between the chemical hose and the heat transfer tube has a problem in that it cannot meet these demands. There has been a desire for a cleaning device for heat exchangers that has a chemical hose connection mechanism with good properties.

[Purpose of the invention] The present invention was made to solve the above-mentioned problems, and it is possible to easily connect and disconnect the chemical hose and the heat transfer tube, and to improve the sealing property of the circulating fluid at the connection part. The purpose of the present invention is to provide a cleaning device for heat exchangers with good quality.

[Means for solving problems]

Next, the means to solve the above problems,
Embodiments will be explained with reference to drawings corresponding to embodiments.

That is, in the present invention, the connection opening 1 of the heat exchanger tube 2
0 and a chemical solution tank 4 through a chemical hose, and circulate a chemical solution or the like between the heat transfer tube 2 and the chemical solution tank 4 by a circulation means to clean the inner surface of the heat transfer tube 2. In this type of cleaning device, the outer circumferential surface of a pipe-shaped base material 12 is covered with a sealing material 13, and the outer circumferential surface of the sealing material 13 is formed on a tapered surface 14 that becomes smaller in diameter as it approaches one end. A connecting jig 9 whose end portion is connected to the chemical solution hose, and a tapered surface 14 of the connecting jig 9 provided through a mounting member 16 to the connecting jig 9 from the one end thereof side to the connecting jig 9. A heat exchanger comprising a fixing magnet 11 that is magnetically fixed in the vicinity of the connection opening 10 of the heat exchanger tube 2 when inserted and pressed into the inner peripheral edge of the opening 10. It's in the utensil cleaning equipment.

[Example] The present invention will be described below with reference to an example shown in FIGS. 1 to 3.

As shown in FIG. 2, the cleaning device 3 of this embodiment
is applied to a multi-tubular heat exchanger 1 (hereinafter referred to as heat exchanger 1). The cleaning device 3 includes:
The chemical liquid 1 has a chemical liquid tank 4 in which the chemical liquid is stored, and a pump 5 installed in the chemical liquid tank 4, and a header 6 is connected to the discharge port side of the pump 5.
One end 7a of a chemical hose 7 is connected to each valve of the header 6, and the other end 7b of the chemical hose 7 is connected to one end 2a of the heat transfer tube 2 fixed by the tube plate 1a of the heat exchanger 1. It is connected. The other end 2b of the heat exchanger tube 2 is fixed by the tube plate 1a.
One end 17a of another chemical liquid hose 17 is connected to the other chemical liquid hose 17, and the other end 17b of the chemical liquid hose 17 is connected to the
It is connected and communicated with a nozzle 4a provided in the chemical liquid tank 4.

Next, the chemical solution hoses 7 and 17, which are the main parts of the present invention,
As shown in FIGS. 1 and 3, the connection mechanism between the heat exchanger tubes 2 and A fixing magnet 11 as a fixing means for crimping and fixing the jig 9 to the connection opening 10 of the heat exchanger tube 2
It is composed of.

The connection jig 9 has a base material 12, for example, a stainless steel pipe with both ends open, and an outer peripheral surface 12a of the base material 12 is coated with a layer of a sealing material 13 made of, for example, rubber, Teflon, or the like. Said sealing material 1
The outer surface of the layer No. 3 is formed into a tapered surface 14 whose outer diameter decreases as it approaches the one side end surface 12b of the base material 12 from approximately the central portion.

As shown in FIG. 1, the other end of the connection jig 9 is connected to a connection device 1 such as a one-touch coupler, for example.
5 is connected to the chemical liquid hose 7, and one end thereof is inserted into the connection opening 10 of the heat transfer tube 2, and the tapered surface 14 is configured to be in close contact with the inner peripheral edge 8 of the connection opening 10.

Next, the fixed magnet 11 has a magnetic attraction force of, for example, about 100 kg, and a clamp 16 as a mounting member that holds the other end of the connection jig 9 is fixed to the fixed magnet 11 with the bottle 16a. As shown in FIG. 3, the fixed magnet 11
The connection jig 9 is fixed magnetically to the tube plate 1a.
The tapered surface 14 of the heat exchanger tube 2 is configured such that the tapered surface 14 can be fixed to the inner peripheral edge 8 of the connection opening 10 of the heat exchanger tube 2 by pressure. The clamp 16 sandwiches the connecting jig 9 between a substantially circular band portion 16c provided at the front end of an arm 16b fixed to the fixed magnet 11, and
A pair of fixing pieces 16d formed at both ends of the connecting jig 9 are fixed by fixing screws 16e, thereby fixing the connecting jig 9. Further, the fixed magnet 11 is provided with a removal arm 18, so that the fixed magnet 11 magnetically fixed to the tube plate 1a can be easily removed.

Next, the operation of the above-mentioned configuration will be explained in detail with reference to the acid cleaning procedure of the heat exchanger 1 using the cleaning device 3 of this embodiment.

As shown in FIGS. 1 and 2, the other end 7 of the chemical solution hose 7 is connected to the header 6 of the cleaning device 3.
The other end of the connecting jig 9 is connected and fixed to b by the connecting jig 15, and the connecting jig 9 is held by the clamp 16 to be integrated with the fixed magnet 11. Then, the fixed magnet 11 is magnetically fixed to the flat part of the tube plate 1a, and the tapered surface 14 side of the connection jig 9 is inserted into the inside of the heat exchanger tube 2, and the inside of the connection opening 10 of the heat exchanger tube 2 is inserted. The tapered surface 14 is crimped and fixed to the peripheral edge 8 to connect and communicate the chemical solution hose 7 and the heat transfer tube 2.

Next, the pump 5 is operated while filling the chemical tank 4 of the cleaning device 3 with water to blow the inside of the heat exchanger tube 2, and after the blowing is completed, the connection opening 10 of the other end 2b of the heat exchanger tube 2 is opened. The other end 17b of the chemical hose 17 is connected to the nozzle 4a of the chemical tank 4.
The pump operation is then restarted, and water is circulated between the chemical tank 4 and the heat transfer tubes 2. Thereafter, a corrosion inhibitor is added to the circulating water, and an acid solution and a reducing agent of a predetermined concentration are further added to perform acid cleaning.

After the acid cleaning is completed, the inside of the heat transfer tube 2 is washed with water, the chemical hoses 7 and 17 are removed, and the inside of the heat transfer tube 2 is brushed. Brushing can be performed using a flexible shaft having brushes of various sizes at its tip and a driving means such as an electric drill for driving the flexible shaft.

After brushing is finished, wash the inside of the heat transfer tube 2 with water, and then use a tube inspection mirror to check that there is no blockage inside the heat transfer tube 2 due to scale. If scale (clogging) is found, clean the chemical hose 7, 17
Connect to the heat exchanger tube 2 and continue acid cleaning.

When clogging is no longer recognized, a neutralizing agent is added to the chemical bath 4 and circulated inside the heat transfer tube 2, and after neutralization, water cleaning and brushing are performed in the same manner as in the case of acid cleaning.

Finally, the chemical solution hoses 7 and 17 are connected to the heat transfer tube 2 again, water is filled in the chemical solution tank 4 and heated, a neutralized rust preventive agent is added, and the mixture is circulated inside the heat transfer tube 2.
After the neutralization and rust prevention treatment is completed, the operation of the pump 5 is stopped and the chemical solution is discharged, and then the connection between the heat exchanger tube 2 and the chemical solution hoses 7 and 17 is released, and the work is completed.

In the above work, the pressure of the fluid circulating inside the chemical hoses 7 and 17 and the heat transfer tube 2 is approximately 2 kg/cm ²
However, the fixed magnet 11 allows the tapered surface 14 of the sealing material 13 to connect to the connection opening 10 of the heat exchanger tube 2.
Since it is securely crimped to the inside, there is no risk of the circulating chemical solution leaking outside. Furthermore, if the heat transfer tube 2 becomes clogged during the circulation of the chemical solution, the connecting portion of the chemical solution hose 7 to the heat transfer tube 2 will receive a reaction force of approximately 10 kg, but this can be sufficiently suppressed by the magnetic force of the fixed magnet 11. Since the connecting jig 9 is constructed around the base material 12, it has sufficient strength even in the direction perpendicular to the axis.

In addition, in the above cleaning work, it is necessary to frequently attach and detach the chemical solution hoses 7, 17 and the heat transfer tube 2 in each work process. 2, the connection jig 9 with a tapered surface 14 is inserted into the connection opening 10 of the heat transfer tube 2, and this is fixed by a fixed magnet 11. , 17 and the heat exchanger tube 2 can be reliably attached and detached with a single touch.

Further, in the embodiment described above, an example was shown in which the cleaning work was performed on one heat exchanger tube 2, but it is possible to use the cleaning device 3 of this embodiment to clean a plurality of heat exchanger tubes at the same time. It goes without saying that there is.

[Effect of idea]

As explained above, according to the present invention, in a cleaning device for heat exchanger tubes 2 of heat exchangers, the tapered surface 14 on the outer periphery of the connection jig 9 connected to the tip of the cleaning chemical hose is connected to the connection of the heat exchanger tubes 2. At the same time as they are inserted into the opening 10 and pressed into contact, the magnetic fixing means provided on the connection jig 9 via the attachment member 16 is magnetically fixed in the vicinity of the connection opening 10 of the heat transfer tube 2. The heat exchanger tube and the heat exchanger tube can be connected with sufficient airtightness and can be easily attached and detached with one touch, and the above-mentioned cleaning work can be carried out efficiently and safely.

In other words, in insertion pressure welding using only the tapered surface 14, if cleaning work is performed at high pressure, the chemical hose may come out, which is dangerous.To avoid this danger, if the tapered surface is strongly pushed into the heat transfer tube, Although the attachment and detachment work is time consuming and inefficient, in the present invention, by combining this with a magnetic fixing means, it is possible to provide a cleaning device that is safe and has good attachment and detachment workability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of an embodiment of the present invention, Fig. 2 is a schematic diagram showing an embodiment of the invention applied to a shell-and-tube heat exchanger, and Fig. 3 is a sectional view showing the main parts of an embodiment of the present invention. FIG. 3 is a partially cutaway perspective view showing the main part of the invention and the part shown in FIG. 2; 2... Heat exchanger tube, 9... Connection jig, 10... Connection opening, 11... Fixed magnet as fixing means, 12... Base material, 13... Sealing material, 14... Tapered surface, 16... ...Clamp as a mounting member.

Claims (1)

[Scope of utility model registration request] A heat exchanger for cleaning the inner surface of the heat transfer tube by connecting and communicating the connection opening of the heat transfer tube and the chemical tank with a chemical hose and circulating a chemical liquid or the like between the heat transfer tube and the chemical tank by a circulation means. In equipment cleaning equipment,
The outer circumferential surface of the pipe-shaped base material is covered with a sealing material, and the outer circumferential surface of the sealing material is formed on a tapered surface that becomes smaller in diameter as it approaches one end, and the other end is connected to the chemical hose. a connecting jig, which is provided to the connecting jig via a mounting member, and when the tapered surface of the connecting jig is inserted and press-welded from the one end side to the inner peripheral edge of the connecting opening, the heat exchanger tube 1. A cleaning device for heat exchangers, comprising: fixing means comprising a fixing magnet magnetically fixed near a connection opening of the heat exchanger.