JP2009138960A - Spiral type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spiral type heat exchanger including a cleaning member exclusively or automatically cleaning and removing all of attachment attached to both wall surfaces opposed to each other, of two sheets of band-shaped heat transfer plates spirally wound by a number of times at prescribed intervals over the whole surfaces. <P>SOLUTION: This spiral type heat exchanger is provided with a plurality of inlets and/or outlets of fluid, a string-shaped cleaning member longer than the band-shaped heat transfer plates, longitudinally dividing a flow channel of the band-shaped heat transfer plates into two, and filled in their clearance, is disposed, the flow channels divided into two are freely expanded or contracted by alternately opening and closing the plurality of inlets and/or outlets, and both wall surfaces opposed to each other, of two sheets of band-shaped heat transfer plates are cleaned by freely sliding the string-shaped cleaning member in the axial direction (direction orthogonal to longitudinal direction of band-shaped heat transfer plates) like a wiper. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a spiral heat exchanger formed by winding one or more belt-shaped heat transfer plates in a spiral shape at predetermined intervals.
More specifically, the present invention relates to a spiral heat exchanger characterized in that a string-like cleaning member is slid and moved on both opposing wall surfaces of the two belt-like heat transfer plates.

  In addition to the spiral type, there are many types of heat exchangers, including plate type, multi-tube type, and others, from home use to industrial use, but any type adheres to the heat transfer plate and conducts heat. There is a problem that the heat transfer plate must be regenerated by cleaning and removing deposits that lower the temperature and deteriorate the efficiency of the heat exchanger.

Household air conditioners and the like need only wipe off the dust collected by themselves, but cleaning and regeneration of the wall surface of the heat transfer plate is extremely important for industrial use that operates continuously for a long period of time.
Thus, in the above industrial use, chlorine is sometimes injected into the cleaning liquid or chemical treatment is performed, but this is also inconvenient from the environment.

However, cleaning these heat transfer plates is indispensable and a tough job.
The normal procedure for cleaning is to first stop the operating device and disassemble the heat exchanger.
In the most widely used multi-tube heat exchangers for industrial use, the lid is opened, and cleaning is performed by rotating the cleaning balls and brushes in the pipe with water flow. In many cases, they were still attached, and it took much more work to remove them.

Further, in the plate type heat exchanger that is used next for industrial use, the heat transfer plate is sealed with a gasket around the circumference of the heat transfer plate, and heat is exchanged by flowing the fluid in a counter flow.
When cleaning this plate heat exchanger, loosen the nuts of many assembly bolts, disassemble the heat transfer plate one by one, remove the gasket, open the space between the heat transfer plate, In this case, cleaning was performed sequentially and repeatedly.

  In addition, as shown in FIG. 1, a spiral heat exchanger is usually a spiral heat exchanger plate 2 and 2 'wound many times in a spiral manner at a predetermined interval. The flow path A flows from the outer periphery to the inner core, and the other fluid flows through the flow path B from the inner core to the outer periphery as a completely counterflow, and exchanges heat. In the figure, 4 is a trunk, 5 is a lid, and 6 is a flange.

Spiral heat exchangers are constructed by winding a strip-shaped heat transfer plate many times in a spiral, so the curvature is different, and it is extremely difficult to clean and regenerate each wall surface of each strip-shaped heat transfer plate. is there. Therefore, the spiral heat exchanger cannot be repaired once assembled, that is, it becomes a scrap.
Further, in the case where members such as a distance bar and a distance spin are used between the belt-shaped heat transfer plates, there is a problem that the members protruding into these flow paths prevent cleaning.
In addition, regardless of the above-mentioned distance spin or the like, the two open end plates 3 of the thin belt-shaped heat transfer plates are bent and welded as shown in FIG. Although the outside of the band tube shape is relatively easy, there is a problem that it becomes more difficult to clean the inside of the band tube shape.

  The conventional cleaning method for these spiral heat exchangers is to remove at least one lid that closes the opening edge of the heat transfer plate wound in a spiral shape, from which high pressure washing water is nozzleed. It was to be ejected from and blown off.

Thus, there is no spiral heat exchanger that can automatically clean and regenerate the belt-shaped heat transfer plate wound in the above-described spiral shape.
For this reason, the spiral heat exchanger functions even with the smallest temperature difference, and is an excellent heat exchanger that is the smallest and has the highest heat exchange efficiency, but is gradually being deceived.
Japanese Patent Application No. 2007-285245

  An object of the present invention is to easily and simultaneously remove and remove both wall surfaces of two strip-shaped heat transfer plates, which have not been proposed in the past, and wound in a spiral shape at predetermined intervals over the entire surface. It aims at providing the spiral heat exchanger which can do.

  And this cleaning work is to be carried out automatically in a solid state without disassembling the spiral heat exchanger.

As shown in FIGS. 2 and 3 to 5, the string-like cleaning member 9 is longer than the belt-like heat transfer plate 2 and has an inlet a for fluid A provided at one end 7 of the belt-like heat transfer plate 2 and an inlet for pressure washing water. Starting from an intermediate point with b, the outlet A ′ of the fluid A and the outlet b ′ of the pressure washing water are similarly provided to the other end 7 ′ of the belt-like heat transfer plate 2 ′. Reference numeral 10 denotes a guide for protecting the entrance / exit.
The string-like cleaning member 9 is swung freely in the axial direction (perpendicular to the longitudinal direction of the belt-like heat transfer plate) by alternately opening and closing the fluid inlets and / or outlets of the plurality of fluids, and like a long wiper. Slide to move.

That is, as developed and shown in FIG. 3, during the normal operation of the spiral heat exchanger 1, the fluid A enters from the inlet a, passes through the flow path A, and is discharged from the outlet a ′.
At this time, the string-like cleaning member 9 spreads downward in FIG. 3 due to the pressure of the fluid A and is attached to the string-like gasket 11 ′ side.

In this state, the spiral heat exchanger is operated for a long time to remove the adhering matter adhering to the opposite surfaces of the belt-like heat transfer plate 2 and the belt-like heat transfer plate 2 ′ constituting the flow path A facing each other. To do.
First, the outlet b ′ shown in FIG. 3 is closed, and pressure wash water is injected from the inlet b. Then, the string-like cleaning member 9 moves upward from the curve 13 as shown by an arrow 12 as shown in FIG. 4, and becomes as shown in FIG. At this time, the fluid in the channel A is discharged from the inlet / outlet a and the outlet a ′.
Thus, the string-like cleaning member 9 that fills the gap between the belt-shaped heat transfer plate 2 and the belt-shaped heat transfer plate 2 ′ has the opposite wall surfaces of the belt-shaped heat transfer plate 2 and the belt-shaped heat transfer plate 2 ′ that are in contact with each other. The deposits can be removed by powerful sliding movement.

On the return trip, this is reversed.
That is, the high-pressure washing water in the return path is introduced from the inlet a or the inlet / outlet a. Then, the high-pressure washing water in the forward path in the flow path A ′ is discharged from the entrances b and b ′ and returns to FIG.

When the string-like cleaning member according to the present invention is installed, various effects listed below can be obtained.
(1) It can be easily installed in a spiral heat exchanger.
(2) The spiral heat exchanger remains solid and does not have to be disassembled.
(3) The doors a, a ′, b, b ′ are expanded, and the string-like cleaning member built in by simply switching the valve moves in a wiper shape at a right angle in the longitudinal direction of the belt-like heat transfer plate. It can be cleaned by sliding and moving the opposite wall surfaces of the belt-like heat transfer plate.
(4) The string-like cleaning member is freely bendable, and the material, configuration, etc., such as rubber can be selected depending on the object to be cleaned.
(5) Since the string-like cleaning member can be used even during normal operation, it is not necessary to stop the line for cleaning.
(6) Applicable to any flow path.
(7) A plurality of string-like cleaning members can be used.
(8) Adjusting the strength and amount of the high-pressure washing water injected from the entrances a, a ′, b, and b ′ to slid or snake the arbitrary places with a string-like cleaning member. Can do.
(9) Even if the string-like cleaning member does not function due to failure or the like, normal operation can be performed in the state of FIG.

  Embodiments of the present invention will be described based on the following Examples 1 to 6.

This embodiment is applied to Japanese Patent Application No. 2007-285245 shown in FIG.
That is, as shown in FIG. 2, string-like gaskets 11 and 11 ′ supported by stud pins 8 connected to the opening edge 3 of the belt-like heat transfer plates 2 and 2 ′ of the spiral heat exchanger 1 flow. A path A and a flow path B are configured.
That is, the core tube C of the spiral heat exchanger 1 of this embodiment is provided with a fluid inlet / outlet a and an inlet / outlet b, and the outside of the core cylinder C along the opening edge 3 of the belt-like heat transfer plate 2. 11 and 11 ′ are wound in a spiral shape, and are installed endlessly around the core tube C and / or the outer cylinder 4 from the opening edge 3. FIG. 3 shows the flow path A in which a string-like cleaning member 9 is housed.
In the following, embodiments of the string-like cleaning member 9 of the present invention are developed and shown in FIGS.

  As shown in FIGS. 3 to 5, the string-like cleaning member 9 has one end 7 at the middle of the fluid inlet / outlet a and the inlet / outlet b, and the inlet / outlet a along the inner side of the opening edge 3 of the belt-like heat transfer plate 2. The other end 7 ′ whose end point is in the middle between “and the entrance b” is reached. The fluid inlet / outlet a and inlet / outlet b and the inlet / outlet a ′ inlet / outlet b ′ can be operated by valves (not shown). This string-like cleaning member 9 has a length sufficient to meander in the middle. In the figure, reference numeral 10 denotes a guide.

The operation of the string-like cleaning member 9 in this example is as follows.
A normal operation as a spiral heat exchanger is performed in the state shown in FIG.
That is, the fluid for heat exchange enters from the inlet a, passes through the channel A, and exits from the outlet a ′.
Accordingly, the apertures a and a ′ are provided with a normal operation aperture.
On the other hand, the diameters of the entrances b and b ′ may be small because only high-pressure washing water is injected.

The first cleaning process (outward path) is shown in FIG. First, the inlet / outlet a and the inlet / outlet a ′ are opened, the inlet / outlet b ′ is closed, and high-pressure washing water is injected from the inlet b into the flow path A ′. Then. The string-like cleaning member 9 leaves the string-like gasket 11 ′ by the pressure of the high-pressure washing water, moves like a curve 13 in the direction of the arrow 12 shown in FIG. 4, and finally comes into close contact with the string-like gasket 11.
At this time, the heat exchange fluid filled in the flow path A up to the string-like gaskets 11 and 11 ′ sealing both the wall surfaces of the opposed strip-shaped heat transfer plates 2 and 2 ′ and the opening edge 3 is , And discharged from the previously opened doors a and / or a ′. Thus, the entire area of the flow path A ′ is occupied by the high-pressure washing water.

The second cleaning process (return path) is shown in FIG.
First, the inlets and outlets b and b ′ are opened, the inlet and outlet a ′ are closed, and high-pressure washing water is injected into the channel A from the inlet and outlet a. Then, the string-like cleaning member 9 leaves the string-like gasket 11 and slides and moves like a curved line 13 'by the pressure of the high-pressure washing water. Finally, the entire string-shaped cleaning member 9 comes into close contact with the string-like gasket 11'. Return to the position of the plates 2, 2 '.
At this time, the wash water in the first step (outward path) filled in the flow path A ′ is discharged from the entrance / exit b and / or the entrance / exit b ′ opened in advance.
Thus, the entire area of the flow path A is occupied by the washing water in the second step (return path).

The forward and return paths may be repeated as necessary.
Further, the pressure of the high-pressure washing water can be changed in intensity to cause arbitrary pulsation, meandering, etc., to change the entrance / exit, and to repeatedly slide in the same place.

As shown in FIGS. 2 and 7, the string-like cleaning member 9 used in this embodiment is made of rubber having an X-shaped cross section. The wire 15 is wrapped around the core, and the tip 16 of the blade-like rubber is pointed.
Accordingly, the string-like cleaning member 9 is bendable, is wound in a spiral shape, and freely follows the non-uniformly continuous arc of the belt-like heat transfer plates 2 and 2 ′, and leaks high-pressure washing water received from behind. First, the deposits are scraped off at the X-shaped tip 16 to clean and regenerate the belt-shaped heat transfer plates 2 and 2 ′.
That is, the string-like cleaning member is suitable for removing the adhering matter by sliding on both opposing wall surfaces of the belt-like heat transfer plate, and spreads in the X shape so as to easily receive the pressure of the high-pressure washing water. Thus, at least a part of the wiper-shaped tip 16 is formed, and both the forward path and the return path of the string-like cleaning member 9 are in close contact with and slide on both wall surfaces of the belt-like heat transfer plates 2 and 2 ′. Has been.

In this example, two string-like cleaning members 9 of the first embodiment are used.
As shown in FIG. 6, the strip-shaped heat transfer plates 2, 2 ′ of the spiral heat exchanger 1 are provided with a partition 17 that also serves as a distance bar.
In this example, the entrances a and b are increased, but the moving distance of the string-like cleaning member 9 is reduced to ½. Therefore, it is good when the distance between both wall surfaces of the opposed belt-like heat transfer plates, that is, when the gap is narrow, when the cylinder is long, or when the curvature is small. In addition, pressure resistance is improved.

This embodiment was applied to a spiral heat exchanger in which one of the opening end edges 3 of the belt-shaped heat transfer plate 2 and the belt-shaped heat transfer plate 2 ′ is bent and welded as shown in FIG. Is.
In the flow path A, the open end edges 3 and 3 'of both heat transfer plates 2 and 2' are welded to form a belt-like tube shape. Can not do it.

Therefore, this is an example of cleaning the flow path B instead of the strip-shaped flow path A.
That is, the string-shaped filling member 20 is filled in the recess 19 formed along the opening edge 3 of the flow path B so that the string-shaped cleaning member 9 does not reach the recess 19. Thus, the string-like cleaning member 9 wrapping the wire 15 is not affected by the recess 19 of the bent portion 18 and is slid on both wall surfaces of the opposite belt-like heat transfer plates as in the first embodiment for cleaning. Can do.

  This embodiment is shown in FIG. The lever 21 that moves the string-shaped cleaning member 9 having a sufficient length is connected to the string-shaped cleaning member 9 at one end 22 and the other end is coupled to the shaft 23 so that the lever 21 is rotated, rotated, or slid in a fan shape. It has become. That is, when the lever 21 is moved to the dotted line 24 by the shaft 23 by a gear (not shown) or the like from the outside and high-pressure washing water is injected from the inlet a, the string-like cleaning member 9 passes through the curved line 13 as in the first embodiment and is dotted. It moves to the position of the string-like cleaning member 9 ′ indicated by. Thus, similar to the first embodiment, it can be cleaned by slidingly moving on both wall surfaces of the opposite belt-like heat transfer plates. In this example, each of the entrances a and a 'may be one.

In the above description, one long string-like cleaning member is provided in a wiper shape, and the cleaning is performed by sliding and moving in a wavy, meandering or parallel manner on both wall surfaces of the belt-like heat transfer plate that comes into contact with the wiper. Without being limited to this, a plurality of string-like cleaning members may be provided.
Further, the shape and the constituent material of the string-like cleaning member are not limited to those in the embodiment, and a plurality of wires may be wrapped, a metal piece 14 or ceramic may be mixed with X-shaped rubber, or attached.

FIG. 1 is a cross-sectional view in which a part of a conventional spiral heat exchanger is omitted. FIG. 2 is an explanatory diagram of the first embodiment. FIG. 3 is an explanatory view showing the first embodiment. FIG. 4 is an explanatory view showing the developed path of the string-like cleaning member according to the first embodiment. FIG. 5 is an explanatory view showing the return path of the string-like cleaning member according to the first embodiment. FIG. 6 is an explanatory view showing the second embodiment. FIG. 7 is a longitudinal sectional view of the opening edge of the third embodiment. FIG. 8 is an explanatory diagram showing the fourth embodiment.

Explanation of symbols

A. Flow path
A 'flow path
B. Flow path
B ′ flow path C.I. Torso a. Doorway
a 'doorway b. Doorway
b 'doorway 1. 1. Spiral heat exchanger 2. Band-shaped heat transfer plate 2 'band-shaped heat transfer plate Open edge 4. Outer trunk 5. Lid 6. Flange 7. End 8. Stud pin 9. 9. String-like cleaning member Guide 11. Gasket 12. Arrow 13. Curve 14. Metal piece 15. Wire 16. Tip 17. Partition 18. Bending 19. Recess 20. Filler 21. Lever 22. One end 23. Axis 24. dotted line

Claims (5)

  A spiral heat exchanger configured by spirally winding at least one set (two sheets) of a long belt-shaped heat transfer plate at a predetermined interval from each other. One or a plurality of inlets and / or outlets are provided, a string-like cleaning member longer than the belt-like heat transfer plate is provided in the middle in the longitudinal direction of the belt-like heat transfer plate, and the plurality of fluid inlets and Alternatively, by alternately opening and closing the outlet, the string-like cleaning member is freely swung in the axial direction (perpendicular to the longitudinal direction of the belt-like heat transfer plate) and is slid and moved like a long wiper. Spiral heat exchanger.   The string-like cleaning member can be freely moved in the axial direction (perpendicular to the longitudinal direction of the belt-like heat transfer plate) by turning or sliding the lever provided at the fluid inlet and / or outlet of the spiral heat exchanger from the outside. ), And the string-like cleaning member is slid and moved like a long wiper.   3. The spiral heat exchanger according to claim 1, wherein the flow path is divided into at least two parts in the longitudinal direction of the belt-shaped heat transfer plate, and a corresponding string-like cleaning member and an inlet / outlet are provided.   The spiral heat exchanger according to any one of claims 1 to 3, wherein a string-like filling member 16 is filled in a recess 19 formed along the opening edge 3 of the flow path A. A string-like cleaning member 9 for cleaning the flow path of the spiral heat exchanger, wherein the string-like cleaning member 9 is a flexible string-like wiper material such as rubber, and a core such as a flexible wire. The spiral heat exchanger according to claim 1, wherein the spiral heat exchanger is wrapped with a material.

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