KR101133066B1 - flow channel switching device for back-washing of heat exchanger - Google Patents

Abstract

The present invention relates to a flow path converter for cleaning the heat exchanger, and more particularly, to simplify the installation of the pipe, and also to the flow path switch for cleaning the heat exchanger so that the flow path for the fluid can be made easily. It is about.

To this end, a flow path inlet is formed on the bottom surface, the body is formed inside the space; is installed on one side of the body, the discharge tube communicated to the inside of the body; a plurality of installed on the other side of the body, inflow through the flow path inlet A circulation pipe, in which the fluid is flowed into a heat exchanger or a pipe in which a fluid of the heat exchanger is flowed into the body; Corresponding connection pipes alternately with: to provide a flow path converter for cleaning the heat exchanger consisting of.

Heat exchanger, back-washing, flow diverter, connecting bend, bottom, extrusion pipe, circulation pipe

Description

Flow channel switching device for back-washing of heat exchanger

The present invention relates to a flow path changer for washing a heat exchanger, and more particularly, to easily change the flow of fluid during back-washing, in which the cleaning is performed by switching the fluid flow of the heat exchanger to backflow. It is about a Euro converter.

The heat exchanger superimposes a plurality of formed metal plates in consideration of the type and flow of the fluid and the structural strength of the product, and alternately flows the heating fluid and the hydrothermal fluid between the layers to allow heat exchange of the fluid passing between the metal plates. Device.

In this case, the heating fluid may be a high temperature fluid such as high temperature water, steam, or lubricating oil, and the hydrothermal fluid may be a fluid having a relatively lower temperature than a high temperature fluid such as water, seawater, and refrigerant.

That is, two types of fluid having different temperatures are separated by the interlayer flow paths between the metal plates and flow in counter flow. The heat exchange is performed while the high and low temperature fluids cross one by one.

At this time, the heat exchanger is compact and lightweight, and has high efficiency and is widely used as a cooling and heating device for various boiler facilities, wastewater treatment facilities, dyeing facilities, power plants, ships, incinerators, and the like.

Hereinafter, a conventional heat exchanger will be described with reference to the accompanying FIG. 1.

The heat exchanger includes an inlet portion 10 and a discharge portion 20 through which fluid flows in and out, a plurality of heat transfer plates 30 overlapping with each other, a fixed plate 40 installed in front of the heat transfer plates 30, and the heat transfer plate 30. End plate 50 in close contact with the rear of the) and the flow cover 60 is disposed behind the end plate (50).

At this time, the heat transfer path 31 is formed in the heat transfer plate 30 at a single interval, and the heating fluid and the hydrothermal fluid are circulated through the heat transfer path 31 through the inlet 10 and the discharge unit 20. .

As such, as the heating fluid and the hydrothermal fluid circulate alternately between the heat transfer plates 30 overlapping each other, heat is transferred by transferring the heat of the heating fluid to the hydrothermal fluid.

On the other hand, the heat exchanger is a contaminant layer (fouling) or scale (scale) is accumulated on the inner wall of the heat transfer path 31 as time passes.

As a result, the cross-sectional area of the flow path is reduced and the flow rate is reduced, resulting in poor heat exchange efficiency, causing many problems such as a decrease in production efficiency, a large loss of energy, and a shortened mechanical life of the heat exchanger.

In order to solve such a problem, in recent years, the heat transfer path 31 has been cleaned by a method such as chemical washing or a mechanical cleaning by a brush or the like every two to three times a year and every one to two years.

However, since this method is performed after energy loss has already occurred in the formation of contaminant adhesion, it is not a fundamental solution.

Accordingly, the invention provided to solve the above problems is a backwashing method.

As an apparatus for backwashing, as shown in FIGS. 2A and 2B, the inlet pipe 11 and the discharge pipe 21 are connected to the inlet 10 and the outlet 20 of the heat exchanger. The reverse flow pipe 70 is alternately installed between the inflow pipe 11 and the discharge pipe 21.

At this time, each of the inlet pipe 11, the discharge pipe 21, the back flow pipe 70 is provided with an opening and closing valve 80 for controlling the opening and closing of the pipe.

Hereinafter, the method of backwashing the heat exchanger will be briefly described.

FIG. 2A shows a state in which the fluid normally proceeds, and only the inflow pipe 11 and the discharge pipe 21 are opened, and the remaining back flow pipe 70 is closed.

Accordingly, the fluid introduced into the inlet pipe 11 proceeds along the heat transfer path 31 and then is discharged through the discharge pipe 21.

Thereafter, in order to clean the heat transfer path 31, the pipes of the inflow pipe 11 and the discharge pipe 21 are closed and the pipe of the backflow pipe 70 is opened as shown in FIG. 2B.

Accordingly, as can be seen through the arrow indicating the flow direction of the fluid, the fluid flowing into the inlet pipe 11 flows into the discharge pipe 21 along the back flow pipe 70 and flows back to the heat transfer path 31. .

Thereafter, the fluid flowing back through the heat transfer path 31 is discharged to the discharge pipe through the counter flow pipe 70.

In this way, the fluid cleans the heat transfer path 31 of the heat exchanger while the fluid flows back through the heat transfer path 31.

However, the conventional method of backwashing the heat exchanger has the following problems.

There is a problem in that the structure is complicated by further providing a backflow pipe 70 in the inlet pipe 11 and the discharge pipe 21, and further providing an on / off valve 80 in each pipe line.

As a result, breakdowns frequently occur and manufacturing costs increase, resulting in a problem of low economic efficiency.

In addition, in the process of backflowing the fluid, the on-off valves 80 installed in each conduit should be operated at the same time. Among them, even if one of the on-off valves 80 causes a malfunction, proper cleaning may not proceed. The problem of damage to the whole aircraft can also be caused.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to easily switch the flow of fluid during back-washing, whereby the flow is reversed by switching the flow of the heat exchanger. To provide a flow path converter for cleaning the heat exchanger.

To this end, a flow path inlet is formed on the bottom surface, the body is formed inside the space; is installed on one side of the body, the discharge tube communicated to the inside of the body; a plurality of installed on the other side of the body, inflow through the flow path inlet A circulation pipe in which the fluid is flowed to the heat exchanger or the fluid flow of the heat exchanger is flowed into the body; the shaft is coupled to the inside of the body, one end of which is installed at an inlet of the flow path and the other end of the circulation pipe by rotation of the shaft. Corresponding connection pipes alternately with: to provide a flow path converter for cleaning the heat exchanger consisting of.

At this time, the circulation tube includes a protruding tube further extended toward the inside of the body, and the other end of the connecting curved tube preferably corresponds to the protruding tube.

In addition, it is preferable that one side of the discharge pipe is further formed with a pollutant discharge pipe from which the pollutant is discharged.

According to the flow path converter for cleaning the heat exchanger according to the present invention has the following effects.

Since the backflow pipe and the opening / closing valve according to the backflow pipe do not need to be additionally installed, the structure of the pipe is not complicated.

Accordingly, since the structure for cleaning the heat exchanger is simplified, there is less concern about failure and the cost of maintenance is reduced, thereby improving economic efficiency.

In addition, since the number of on-off valves is not large, there is an effect that the fear of malfunction is reduced.

Hereinafter, with reference to the accompanying Figures 3 to 6b will be described with respect to the flow path converter (hereinafter referred to as "euro converter") for cleaning the heat exchanger according to a preferred embodiment of the present invention.

The flow path converter includes a body 100, a discharge pipe 200, a circulation pipe 300, and a connection curved pipe 400.

The body 100 constitutes an exterior of the flow path switch, and a space S in which the fluid is accommodated is formed.

At this time, the body 100 is preferably made of a cylindrical shape.

In addition, the bottom surface of the body 100 is formed with a flow path inlet (100a) that is a passage through which fluid is introduced.

In addition, one side of the outer peripheral surface of the body 100 is formed with a flow path outlet (100b) that is a passage discharged to the outside from the space (S) of the body 100, the other side of the outer surface of the body 100 inside the body 100 The circulation port 100c, which is a passage for circulating the fluid introduced into the heat exchanger side, is formed.

In this case, two circulation ports 100c are formed.

One of these is a passage through which the fluid introduced into the space S of the body 100 exits to the heat exchanger side, and the other is a passage through which the fluid on the heat exchanger side enters the space S of the body 100.

On the other hand, the flow path inlet (100a) is provided with an inlet pipe 110 for providing a pipe in which the fluid flows into the space (S) of the body (100).

That is, it can be seen that the fluid flowing into the space S of the body 100 by such a configuration is flowed through the bottom of the body 100.

Next, the discharge pipe 200 serves as a pipe for discharging the fluid introduced into the space (S) of the body 100 from the heat exchanger to the outside, in the flow path outlet (100b) formed on one side of the outer peripheral surface of the body (100) Is installed.

At this time, it is preferable that the contaminant discharge pipe 210 is further installed at the end of the discharge pipe 200.

The contaminant discharge pipe 210 is a conduit for discharging contaminants discharged from the heat exchanger into the space S of the body 100 by a reverse flow of fluid to a separate place, and is different from the end of the discharge pipe 200. It is preferred to be installed to face.

At this time, between the end of the discharge pipe 200 and the pollutant discharge pipe 210 is provided with a control valve 220 for controlling the opening and closing of the pipe.

That is, by such a configuration, the fluid is normally circulated in the heat exchanger to close the conduit of the contaminant discharge pipe 220 so that the fluid is discharged through the discharge pipe 200, and from the body 100 in the process of back washing When the contaminants are discharged, the discharge pipe 200 is closed to discharge the contaminants to a separate place through the contaminant discharge pipe 210.

Next, the circulation pipe 300 serves as a pipe through which the fluid introduced into the space of the body 100 is flowed to the heat exchanger side, or the fluid of the heat exchanger is flowed into the space of the body 100.

To this end, the circulation pipe 300 is provided in two, it is installed in the circulation port (100c) formed on the other side of the outer peripheral surface of the body (100).

 That is, one end of the circulation pipe 300 is installed in the circulation port (100c) of the body 100, the other end of the circulation pipe 300 is installed in the inlet 10 and the discharge unit 20 of the heat exchanger. Will be.

At this time, it is preferable that the protruding pipe 310 is further extended to one end of each circulation pipe 300.

The protruding pipe 310 is provided to ensure a space spaced between the end of the connection bent pipe and the inner circumferential surface of the body 100 to be described later, the space (S) of the body 100 from one end of the circulation pipe 300 Is further extended toward

Next, the connection curved pipe 400 serves to vary the flow path of the fluid introduced through the flow path inlet 100a of the body 100.

At this time, the connection curved pipe 400 is installed in the space (S) of the body (100).

At this time, one end of the connection curved pipe 400 is installed in the flow path inlet 100a, and the other end of the connection curved pipe 400 is bent roundly to correspond to any one circulation pipe 300.

Exactly, the other end of the connecting curved pipe 400 corresponds to any one of the protruding pipes 310 extending from the circulation pipe 300.

On the other hand, the connecting curved pipe 400 is rotatably installed about one end thereof.

To this end, the connecting curved pipe 400 is axially coupled on the space (S) of the body (100).

At this time, the shaft 410 penetrates through the interior of the connecting curved tube 400, one end of the shaft 410 is installed on the flow path inlet (100a) side, the other end of the shaft 410 is above the body 100 Is exposed.

In this case, the connecting curved pipe 400 is preferably formed to have a larger diameter than the inlet pipe 110, the discharge pipe 200, the circulation pipe 300, etc., because the shaft 410 is installed. no.

On the other hand, the other end of the shaft 410 is connected to the drive device 500 including a motor (M).

By such a configuration, the connecting curved pipe 400 is rotated about one end of the connecting curved pipe 400 by the rotation of the shaft 410, it is possible to correspond to the two circulation pipes 300 alternately.

Hereinafter, the operation of the flow path switch having the above configuration will be described with reference to FIGS. 6A and 6B.

FIG. 6A illustrates a state in which the fluid is circulated to the heat exchanger through the flow path switch, and the other end of the connection curved pipe 400 corresponds to any one of the protruding pipes 310A (hereinafter, referred to as a “first protruding pipe”). .

At this time, when the pump (not shown) is operated, the fluid is flowed through the inlet pipe 110 to the connection pipe 400 installed in the space (S) of the body (100).

Subsequently, the fluid passes through one of the circulation pipes 300A (hereinafter referred to as 'first circulation pipe') through the first protruding pipe 310A through the connecting curved pipe 400, and passes the first circulation pipe 300A. The fluid passed through the inlet 10 passes through the heat transfer path 31 (see FIG. 1) of the heat exchanger.

Thereafter, the heat-exchanged fluid is passed through another circulation pipe 300B (hereinafter referred to as 'second circulation pipe') through the discharge part 20, and then another protrusion pipe 310B (hereinafter referred to as 'second protrusion pipe'). ') Is introduced into the space (S) of the body 100.

Thereafter, the fluid introduced into the space of the body 100 is discharged through the discharge pipe 200 through the flow path outlet 100b.

At this time, the conduit of the pollutant discharge pipe 210 installed in the discharge pipe 200 is in a closed state.

On the other hand, to clean the heat transfer path 31 (see FIG. 1) of the heat exchanger using the reverse flow of the fluid, as shown in Figure 6b by rotating the connecting curved pipe 400 in the state where the fluid is in progress as described above Likewise corresponds to the second projection pipe (310B) and open the conduit of the contaminant discharge pipe 220.

At this time, the pipe line of the discharge pipe 200, exactly the pipe end of the discharge pipe 200 is closed.

Thereafter, when the shaft 410 is rotated by driving the driving device 500 installed on the upper portion of the shaft 410, the connection curved pipe 400 along with the shaft 410 is rotated about one end thereof.

Thereafter, the other end of the connection curved pipe 400 corresponds to the second protrusion pipe 310B.

In this process, the fluid is continuously being discharged from the connecting curved tube 400, and the fluid discharged from the connecting curved tube 400 and the fluid discharged through the second protruding tube 310B in the space S of the body 100. Fluids are mixed.

Of course, the mixed fluid is discharged through the flow path outlet 100b.

On the other hand, between the other end of the connection pipe 400 and the inner circumferential surface of the body 100 is spaced apart by the length of the protruding pipe 310, so that the connection pipe 400 is a second protrusion from the first protrusion pipe (310A) When rotating toward the tube 310B, the pressure that the fluid discharged from the connecting curved tube 400 hits the inner circumferential surface of the body 100 may be somewhat relaxed.

Accordingly, since the overload of the pump can be prevented to reduce the mechanical burden, there is an effect that the damage of the pump is prevented.

On the other hand, when the other end of the connecting curved pipe 400 corresponds to the second protrusion pipe 310B, the driving device 500 installed on the upper portion of the shaft 410 is stopped driving.

Thereafter, the fluid discharged from the connecting curved tube 400 flows back through the heat transfer path 31 of the heat exchanger after passing through the second protruding pipe 310B and the second circulation pipe 300B.

At this time, the fluid is discharged along with the contaminants formed in the heat transfer path 31 and eventually discharged into the space S of the body 100 through the first circulation pipe 300A and the first protrusion pipe 310A.

Thereafter, the contaminant mixed fluid is discharged to a separate place through the contaminant discharge pipe 210 after passing through the flow path outlet 100b.

As such, while the reverse flow of the fluid continues, the heat transfer path 31 of the heat exchanger is cleaned.

As described so far, the flow path switching device according to the present invention is simple in structure and can easily perform the switching to the flow path, so that there is no fear of malfunction.

In addition, since a conduit for discharging pollutants generated during the cleaning process is configured separately, it may be convenient to manage the discharge of pollutants.

1 is a perspective view showing a general heat exchanger

2A and 2B are schematic views showing a state in which back-washing of a heat exchanger is made according to the prior art;

3 and 4 are a side cross-sectional view and a front cross-sectional view showing a flow path converter according to a preferred embodiment of the present invention

5 is a side view schematically showing a state in which a flow path converter according to a preferred embodiment of the present invention is installed in a pipe;

Figure 6a and Figure 6b is a plan view schematically showing that the backwash is performed for the heat exchanger by the flow path changer according to a preferred embodiment of the present invention.

* Description of Major Symbols in Drawings *

100: body 100a: flow path inlet

100b: flow path outlet 100c: circulation port

110: inlet pipe 200: discharge pipe

210: pollutant discharge pipe 220: control valve

300: circulation pipe 300A: first circulation pipe

300B: second circulation tube 310: protrusion tube

310A: first projection tube 310B: second projection tube

400: connecting pipe 410: axis

500: drive device S: space

Claims (3)

A passage inlet is formed at a bottom thereof, and a body having a space formed therein; A discharge tube installed at one side of the body and communicating with a space of the body; A plurality of circulation pipes installed on the other side of the body, the circulation pipe being a pipe through which a fluid introduced through a flow path inlet flows into a heat exchanger or a fluid of a heat exchanger flows into a space of a body; A protruding tube extending from the circulation tube toward the inside of the body; And And a coupling curved tube coupled to the space of the body, one end of which is installed at an inlet of the flow path and the other end of which is alternately connected to the protruding pipe by the rotation of the shaft. delete The method of claim 1, One side of the discharge pipe is a flow path switch for cleaning the heat exchanger, characterized in that the pollutant discharge pipe is further formed discharged.

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