Scraper plate moving device inside heat exchanger and heat exchanger

Abstract

To provide: a scraper plate moving device inside a heat exchanger, capable of easily moving, via a wire rope, a movable plate for scraping off dirt adhering to the outer surface of a heat transfer tube; and a heat exchanger equipped with the scraper plate moving device inside the heat exchanger.SOLUTION: A moving device for moving, via a wire rope and a traction machine for the wire rope, a scraper plate movably installed inside a heat exchanger and used for scraping dirt substances from the outer circumferential surface of a heat transfer tube. The traction machine has therein a rotary body around which the wire rope is wound on its outer circumferential surface, and includes a first wire-rope insertion hole that guides the wire rope from one end face of the traction machine to the rotary body, and a second wire-rope insertion hole that guides the wire rope from the other end face of the traction machine to the rotary body. By rotating the rotary body, the wire rope moves from the first wire-rope insertion hole to the second wire-rope insertion hole or vice versa.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a device for moving a scraper plate in a heat exchanger and a heat exchanger, and more particularly to a device for moving a scraper plate in a heat exchanger that scrapes off dirt adhering to the outer surface of a heat transfer tube, and a heat exchanger equipped with this moving device. [Background technology]

[0002] A moving cleaning plate system (Patent Documents 1 and 2) is known as a cleaning mechanism for a heat exchanger that has a mechanism for scraping off dirt adhering to the outer surface of a heat transfer tube.

[0003] Patent Document 1 discloses a configuration in which multiple baffles in a shell-and-tube heat exchanger are moved back and forth along the tubes to scrape off dirt adhering to the tube surfaces. In Patent Document 1, each baffle is moved along the tube by moving a support rod connected to each baffle back and forth using a motor.

[0004] Patent Document 2 discloses a configuration in which a cleaning plate (referred to as a slider in Patent Document 2) is reciprocally slid using a feed screw mechanism to scrape off dirt from the outer surface of a heat transfer tube. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-207813 [Patent Document 2] Japanese Utility Model Application Publication No. 62-107289 Summary of the Invention [Problem to be solved by the invention]

[0006] In a configuration such as that described in Patent Document 1, in which a support rod is connected to a baffle plate and moves back and forth to remove dirt from the outer surface of a heat transfer tube, the movement distance of the baffle plate is the same as the stroke length of the support rod. Therefore, while the range of movement of the baffle plate can be increased sufficiently by using a longer support rod, this would significantly increase the maximum protrusion length of the support rod from the shell, making this unrealistic. Furthermore, since a motor-equipped movement device is connected to the tip of the support rod, the protrusion length from the shell becomes even greater.

[0007] In Patent Document 2, the feed screw mechanism is incorporated into the heat exchanger, which makes the internal structure of the heat exchanger complex.

[0008] To provide a scraper plate moving device in a heat exchanger that can easily move a moving plate for scraping off dirt adhering to the outer surface of a heat transfer tube via a wire rope, and a heat exchanger equipped with the scraper plate moving device in the heat exchanger. [Means for solving the problem]

[0009] The present invention has the following gist.

[0010] [1] A moving device for moving a scraping plate for scraping off fouling materials from the outer surface of a heat transfer tube, which is movably installed in a heat exchanger, using a wire rope and a traction machine for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, and is provided with a first wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, and a second wire rope insertion hole for guiding the wire rope from the other end face of the towing machine to the rotating body, A scraper plate moving device in a heat exchanger, in which the wire rope moves from the first wire rope insertion hole to the second wire rope insertion hole or vice versa by rotating the rotating body.

[0011] [2] A device for moving a scraper plate in a heat exchanger according to [1], in which a shaft for rotating the rotor protrudes from the traction machine.

[0012] [3] A scraper plate moving device in a heat exchanger of [1], comprising a first tubular body for guiding the wire rope, which guides the wire rope extending from one end of the heat exchanger to the first wire rope insertion hole, and a second tubular body for guiding the wire rope, which guides the wire rope extending from the other end of the heat exchanger to the second wire rope insertion hole.

[0013] [4] The first tubular body and the second tubular body extend in a U-shape or semicircular arc shape of 0.01R or more, or have no corners of 0.01R or less. [3] The scraper plate movement device in the heat exchanger of [3].

[0014] [5] A body tube; a plurality of heat transfer tubes arranged in parallel within the body tube; a scraper plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; A scraper plate moving device in any one of the heat exchangers [1] to [4] for moving the scraper plate back and forth via a wire rope; A heat exchanger having:

[0015] [6] A moving device for moving a scraping plate for scraping off fouling materials from the outer circumferential surface of a heat transfer tube, which is movably installed in a heat exchanger, using a wire rope and a traction machine for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, a first wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, and a second wire rope insertion hole for guiding the wire rope from the other end face of the towing machine to the rotating body; a sealing structure surrounding the wire rope extending from the second wire rope insertion hole, A scraper plate moving device in a heat exchanger, in which the wire rope moves through the first wire rope insertion hole and the second wire rope insertion hole into the sealing structure by rotating the rotating body.

[0016] [7] A device for moving a scraper plate in a heat exchanger according to [6], in which a shaft for rotating the rotor is protruded from the traction machine.

[0017] [8] A device for moving a scraper plate in a heat exchanger according to [6], which is provided with a tubular body for guiding the wire rope extending from the heat exchanger to the first wire rope insertion hole.

[0018] [9] A heat exchanger comprising two scraper plate moving devices (hereinafter referred to as moving devices in this claim) (hereinafter referred to as a first moving device and a second moving device), in the heat exchanger of any one of [6] to [8], A body tube and a plurality of heat transfer tubes arranged in parallel within the body tube; a scraping plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; It is equipped with The scraper plate is moved in one direction by the first moving device via a first wire rope, and the scraper plate is moved in the other direction by the second moving device via a second wire rope extending in the opposite direction to the first wire rope. heat exchanger.

[0019]

[10] A moving device for moving a scraping plate for scraping off fouling materials from the outer circumferential surface of a heat transfer tube, which is movably installed in a heat exchanger, by a wire rope and a traction machine for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, and has a wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, A device for moving a scraper plate in a heat exchanger, in which the wire rope is passed through the wire rope insertion hole and wound around the rotating body by rotating the rotating body.

[0020]

[11] A device for moving a scraper plate in a heat exchanger according to

[10] , in which a shaft for rotating the rotor is protruded from the traction machine.

[0021]

[12] A device for moving a scraper plate in a heat exchanger according to

[10] , which is provided with a tubular body for guiding the wire rope extending from the heat exchanger to the wire rope insertion hole.

[0022]

[13] A scraper plate moving device in a heat exchanger according to [1], [6] or

[10] , wherein a spiral groove for winding a wire rope is provided on the outer peripheral surface of the rotating body.

[0023]

[14] A scraper plate moving device in a heat exchanger of [1], [6] or

[10] , wherein the rotating body has a through hole or recess in a direction different from the axial direction, and a locking portion for locking the tip of the wire rope is provided in the through hole or recess.

[0024]

[15] A heat exchanger having two scraper plate movement devices (hereinafter referred to as movement devices in this claim) (hereinafter referred to as a first movement device and a second movement device) in the heat exchanger of

[10] or

[11] , wherein the heat exchanger is A body tube and a plurality of heat transfer tubes arranged in parallel within the body tube; a scraping plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; It is equipped with The first wire rope connected to the scraper plate is wound around the rotating body of the first moving device to move it in one direction, and the second wire rope connected to the scraper plate and extending in the opposite direction to the first wire rope is wound around the rotating body of the second moving device to move it in the other direction. heat exchanger. [Effects of the Invention]

[0025] In the present invention, a wire rope is connected to the movable plate, and the movable plate is moved by pulling the wire rope. According to the present invention, it is possible to move the movable plate without using a long and large moving mechanism that protrudes outside the heat exchanger, and without installing a complex drive mechanism inside the heat exchanger.

[0026] Generally, since a wire rope is made of twisted wires, the outer circumferential surface of the wire rope is not smooth. Therefore, when the wire rope is inserted into the wire rope insertion hole, a gap is formed between the outer circumferential surface of the wire rope and the inner circumferential surface of the wire rope insertion hole, and fluid from inside the heat exchanger flows out of the heat exchanger through the gap.

[0027] In one aspect of the present invention, a wire rope guide tube for guiding the wire rope to the outside of the heat exchanger is connected to the heat exchanger, and a wire rope pulling device with a sealing mechanism is provided at the end of the wire rope guide tube, thereby sealing the inside of the heat exchanger from the outside (atmosphere) in an airtight or liquid-tight manner. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a front view showing the inside of a body tube of a heat exchanger according to an embodiment in a see-through state; [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a perspective view showing the configuration of a heat transfer tube and a scraper plate. [Figure 5] FIG. 2 is a cross-sectional view taken along the axial direction of the traction machine. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 10 is a front view showing the inside of a body tube of a heat exchanger according to another embodiment in a see-through state. [Figure 10] FIG. 2 is a cross-sectional view showing a sealing structure. [Figure 11] FIG. 10 is a perspective view showing another example of a rotating body. [Figure 12] FIG. 10 is a perspective view showing another example of a rotating body. [Figure 13] 13 is a perspective view of the rotating body of FIG. 12 from which a locking member has been removed. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an embodiment will be described with reference to the drawings.

[0030] [First embodiment] 1 to 8 show a first embodiment. As shown in Fig. 1, a heat exchanger 1 according to this embodiment includes a cylindrical body tube (shell) 2 and a plurality of heat transfer tubes 3 provided within the body tube 2. In this embodiment, the axial direction of the cylindrical body tube 2 is configured to be the vertical direction, but in the heat exchanger of the present invention, the axial direction of the body tube may be horizontal or oblique.

[0031] Inlet and outlet ports 4 and 5 for the first fluid are provided in the end plates at both axial ends of the body tube 2. Near the inlet and outlet port 4 on the top side of the body tube 2, an upper tube plate 6 is provided with its plate surface oriented horizontally.

[0032] The outer peripheral edge of the upper tube plate 6 is watertightly fixed by welding or the like to the inner peripheral surface of the body tube 2. A lower tube plate 7 is provided with its plate surface oriented horizontally near the supply / discharge port 5 on the bottom side of the body tube 2. The outer peripheral edge of the lower tube plate 7 is watertightly fixed to the inner surface of the body tube 2 by welding or the like.

[0033] The upper side of the upper tube plate 6 is a supply / discharge chamber 21, and the lower side of the lower tube plate 7 is a supply / discharge chamber 22. A chamber 20 is formed between the upper tube plate 6 and the lower tube plate 7.

[0034] Inlet / outlet ports 8 (8a, 8b) for the second fluid are provided at the upper part of the side of the body tube 2 (directly below the upper tube plate 6), and inlet / outlet ports 9 (9a, 9b) for the second fluid are provided at the lower part of the side of the body tube 2 (directly above the lower tube plate 7). The second fluid flows from inlet / outlet port 8 to inlet / outlet port 9 (or vice versa) within the chamber 20.

[0035] As will be described later, it is desirable to provide two or more supply and discharge ports 8, 9 for the second fluid in order to discharge dirt from the outer surface of the heat transfer tube, and to arrange them at equal intervals in the circumferential direction of the body tube 2 and at the same height in the horizontal plane. However, since an excessive number of supply and discharge ports will complicate the structure and increase costs, it is desirable to provide two to four supply and discharge ports 8, 9. In this embodiment, two supply and discharge ports 8, 9 are provided as supply and discharge ports 8a, 8b, 9a, 9b each, facing each other in the diametric direction of the body tube 2.

[0036] The multiple heat transfer tubes 3 are arranged vertically parallel to one another within the chamber 20 of the body tube 2. The upper ends of the heat transfer tubes 3 penetrate the upper tube plate 6, and the interiors of the heat transfer tubes 3 communicate with the supply and discharge chamber 21. The lower ends of the heat transfer tubes 3 penetrate the lower tube plate 7, and the interiors of the heat transfer tubes 3 communicate with the supply and discharge chamber 22. The first fluid that flows in from the supply and discharge port 4 passes through the supply and discharge chamber 21 and the interiors of the multiple heat transfer tubes 3, exchanges heat with the second fluid, passes through the supply and discharge chamber 22, and flows out from the supply and discharge port 5. The flow direction of the first fluid may be reversed.

[0037] A plurality of scraping plates 10 (10A, 10B, 10C) (three in this embodiment) that can be moved up and down are horizontally disposed within the chamber 20 of the body tube 2. Each scraping plate 10 is circular in plan view, and its diameter is slightly smaller (approximately 2 mm or less) than the inner diameter of the body tube 2.

[0038] 2 to 4, the scraper plate 10 is provided with through holes 14 for the heat transfer tubes 3, and the heat transfer tubes 3 are inserted through the through holes 14. The diameter of the through holes 14 is the same as the outer diameter of the heat transfer tubes 3 or slightly larger (approximately 2 mm or less). As the scraper plate 10 moves up and down, the outer surfaces of the heat transfer tubes 3 slide against the inner peripheries of the through holes 14, scraping off dirt from the outer surfaces.

[0039] A wire rope insertion hole 11a that penetrates vertically is provided in the center of each scraper plate 10, and a wire rope W is inserted into each hole 11a. Stoppers (not shown) are provided on the wire rope W directly above and below each scraper plate 10, allowing each scraper plate 10 to move integrally with the wire rope W.

[0040] The scraper plate 10 is also provided with a flow hole 13 so that the second fluid can pass from the upper side to the lower side of the scraper plate 10 or from the lower side to the upper side.

[0041] In this embodiment, as shown in Figures 2 to 4, the flow holes 13 are chord-arc-shaped openings that run along the outer edge of the scraper plate 10, but they may also be cutouts that are formed by cutting out the outer edge of the scraper plate 10 in the chord direction.

[0042] The size of the through holes 13 is preferably about 5 to 30% of the area of ​​the scraper plate 10. The heat transfer tubes 3 may or may not be inserted into the through holes 13.

[0043] In this embodiment, one through hole 13 is provided in each scraper plate 10. The through holes 13 of each scraper plate 10 are preferably positioned opposite each other across the axial center line of the body tube 2 in adjacent scraper plates 10, 10. For example, in odd-numbered scraper plates 10 from the top, the through hole 13 is located on the right side in FIG. 1, and in even-numbered scraper plates 10, the through hole 13 is located on the left side in FIG. 1.

[0044] Furthermore, as shown in FIG. 4, by providing a flow hole 13 at the position of the opposing heat transfer tube 3, it is possible to omit providing a through hole 14 in the corresponding heat transfer tube 3.

[0045] The scraper plate 10 having the flow holes 13 functions as a baffle plate to increase the flow path length when the second fluid flows from the supply / discharge port 8 to the supply / discharge port 9 (or vice versa) within the chamber 20 during normal operation of the heat exchanger 1.

[0046] 1 , in normal operation, the second fluid that flows into chamber 20 from supply / discharge port 8 or 9 passes through each of the flow holes 13, flows in a zigzag pattern within chamber 20, and flows out from supply / discharge port 9 or 8. The first and second fluids exchange heat with each other via the walls of the heat transfer tubes 3.

[0047] The first and second fluids may flow in parallel or countercurrent directions. Countercurrent flow can improve heat transfer efficiency compared to parallel flow.

[0048] In this embodiment, three scraper plates 10 are installed, but the number may be approximately 2 to 7, and is not limited to this. Increasing the number of scraper plates 10 improves the ability to remove dirt from the heat transfer tubes 3. In the steady operation state of the heat exchanger 1, the spacing between the scraper plates 10, 10 is approximately equal, and is preferably approximately 10 to 35%, and more preferably approximately 15 to 25%, of the distance between the upper tube plate 6 and the lower tube plate 7 of the body tube 2. The thickness of the scraper plates 10 is preferably approximately 1 mm to 20 mm, and more preferably approximately 2 mm to 10 mm.

[0049] A protrusion 11 is provided on the upper surface of the scraper plate 10. This protrusion 11 functions as a spacer to prevent the scraper plates 10 from overlapping with each other or the upper tube plate 6 and the scraper plate 10 when the scraper plates 10 are moved to the upper limit of their ascent, as shown in FIG.

[0050] A protrusion 12 is provided on the underside of the scraper plate 10. This protrusion 12 functions as a spacer to prevent the scraper plates 10 from overlapping each other or the lower tube plate 7 and the scraper plate 10 when the scraper plate 10 moves to the lower limit.

[0051] In this embodiment, the protrusions 11, 12 are arranged coaxially in the center of each scraper plate 10. The wire rope insertion hole 11a is provided so as to penetrate from the upper surface of the protrusion 11 to the lower surface of the protrusion 12.

[0052] A traction system using a wire rope W is adopted as a drive device for moving the scraper plate 10.

[0053] From the viewpoint of corrosion prevention, it is desirable that the wire rope W be made of resin, or that the outer surface of a metal wire rope be coated with a corrosion-resistant material such as resin.

[0054] As shown in FIG. 1, a wire rope guide tube 30 is provided to extend the wire rope W upward, and a wire rope guide tube 35 is provided to extend the wire rope W downward.

[0055] The lower end of the wire rope guide pipe 30 passes through the upper tube plate 6, and its interior is in communication with the chamber 20. The upper part of the wire rope guide pipe 30 passes through the upper end plate of the body tube 2 and extends upward. One end of a semicircularly curved wire rope guide pipe 31 is connected to the upper end of the wire rope guide pipe 30, and one end of a straight wire rope guide pipe 32 is connected to the other end of the wire rope guide pipe 31.

[0056] The upper end of wire rope guide pipe 35 passes through lower tube plate 7, and its interior is in communication with chamber 20. The lower part of wire rope guide pipe 35 passes through the lower end plate of body tube 2 and extends downward. One end of wire rope guide pipe 34, which is curved in a semicircular shape, is connected to the lower end of wire rope guide pipe 35, and one end of straight wire rope guide pipe 33 is connected to the other end of wire rope guide pipe 34.

[0057] The other end (lower end) of the wire rope guide tube 32 is connected to one end (upper end) of the wire rope pulling machine 40, and the other end (upper end) of the wire rope guide tube 33 is connected to the other end (lower end) of the wire rope pulling machine 40. The connecting body (tubular body) of the wire rope guide tubes 30-32 and the connecting body (tubular body) of the wire rope guide tubes 30-32 each extend in a J shape.

[0058] The curvature of the wire rope guide pipes 31, 34 depends on the diameter and strength of the wire rope, but it is desirable that it be 0.01R or greater. If the curvature is too small, friction with the wire rope increases, resulting in a large driving force required for pulling. Therefore, it is desirable that the shape of the wire rope guide pipes 31, 34 extend in a U-shape or semicircular arc shape with an R of 0.01R or greater, or that there be no corners with an R of 0.01R or less, and all corners extend in a shape with an R of 0.01R or greater.

[0059] Even if the wire rope guide pipe does not have corners of 0.01R or less, if right and left bends are alternately arranged, friction will occur between the wire rope and the wire rope, so it is desirable to make the wire rope bend in approximately one direction even if the curvature is not constant. In other words, if the wire rope guide pipe leaving the heat exchanger and heading toward the wire rope traction machine is curved continuously or at intervals, it is preferable that the direction of the curves be approximately the same. Also, it is desirable to set the end of the heat exchanger, the wire rope guide pipe, and the receiving port of the wire rope traction machine so that they are approximately on the same plane.

[0060] The wire rope W extends vertically through the holes 11a of each scraper plate 10. The wire rope W extending upward from within the chamber 20 passes through wire rope guide pipes 30, 31, and 32 to reach the wire rope pulling machine 40. The wire rope W extending downward from within the chamber 20 passes through wire rope guide pipes 35, 34, and 33 to reach the wire rope pulling machine 40.

[0061] As described above, within the chamber 20, fasteners are fixed to the wire rope W immediately above and below each scraper plate 10, so that each scraper plate 10 moves up and down when the wire rope W is pulled.

[0062] [Structure of wire rope traction machine 40] 5 to 8, wire rope pulling machine 40 includes cylindrical housing 42, wire rope guide blocks 46A and 46B provided inside housing 42, a rotor 43 provided inside housing 42 and between wire rope guide blocks 46A and 46B, a shaft 44 that rotates rotor 43, a guide 45A that slides on the upper surface of rotor 43, and a guide 45B that slides on the lower surface of rotor 43. The posture (arrangement angle) of this pulling machine 40 is arbitrary, but for convenience, this embodiment will be described assuming that the axial direction of cylindrical housing 42 is the left-right direction and the axial direction of the rotation shaft of rotor 43 is the up-down direction.

[0063] Flanges 42b and 42c are provided on both left and right ends of the housing 42.

[0064] A shaft insertion hole 42a is formed in the central top portion of the housing 42, and the shaft 44 is inserted through it. The diameter of the shaft insertion hole 42a is the same as or slightly larger than the outer diameter of the shaft 44. An O-ring 49 that constitutes a sealing mechanism is attached to the outer peripheral surface of the shaft 44 midway in the axial direction, and the O-ring 49 is in slidable contact with the inner peripheral surface of the shaft insertion hole 42a. The O-ring 49 may be made of any material, such as resin or rubber, with rubber being preferred.

[0065] 7, the rotor 43 is circular in plan view and has a vertically elongated, approximately circular or elliptical shape in elevation view. A horizontally extending key groove 43a is provided at the top of the rotor 43, and a key portion 44a at the tip of the shaft 44 is fitted into the key groove 43a.

[0066] A circumferential groove 43b having a groove width that allows the wire rope W to fit therein is formed on the side peripheral surface of the rotating body 43. The groove width of the circumferential groove 43b is equal to or slightly larger than the wire diameter of the wire rope W. The groove depth is also equal to or slightly larger than the wire diameter of the wire rope.

[0067] As shown in FIG. 8, protrusions 43t are provided at predetermined intervals in the circumferential direction on the bottom surface of the circumferential groove 43b, thereby increasing the frictional force between the wire rope W and the circumferential groove 43b.

[0068] Most of the shaft 44 is cylindrical, and its lower end forms a key portion 44a that engages with the key groove 43a of the rotor 43 described above. The key portion 44a has a long, thin rectangular parallelepiped shape that extends perpendicular to the axial center line of the shaft 44. A handle or crank (not shown) is provided at the upper end of the shaft 44. If it is an electric type rather than a manual type, a drive mechanism is connected to the shaft 44.

[0069] The wire rope guide blocks 46A, 46B are generally cylindrical with a cylindrical outer periphery and fit into the cylindrical inner cavity of the housing 42. Small holes 46a, 46b are formed through the guide blocks 46A, 46B from one end face to the other. The small holes 46a, 46b are positioned on the same straight line, and this straight line coincides with the diameter direction of the circumferential groove 43b. The inner diameter of the small holes 46a, 46b is approximately 2 to 3 times the wire diameter of the wire rope W.

[0070] When the shaft 44 is rotated to rotate the rotor 43, the wire rope W moves in the left and right directions in FIGS. 5 and 6 due to the friction between the inner surface of the circumferential groove 43b, particularly the groove bottom surface, and the wire rope W.

[0071] In this embodiment, the wire rope W is engaged with the circumferential groove 43b over a range of half a circumference, but the wire rope W may be configured to be wound around the rotating body 43 over one and a half, two and a half or more circumferences.

[0072] In a heat exchanger configured as described above, to perform cleaning to remove fouling materials adhering to the outer peripheral surfaces of the heat transfer tubes 3 and the inner peripheral surface of the body tube 2, the flow of the first and second fluids is stopped as shown in FIG. 1 , and the rotor 43 of the traction machine 40 is rotated to move the scraper plate 10 upward or downward via the wire rope W. This causes the inner peripheral surfaces of the through holes 14 to rub against the outer peripheral surfaces of the heat transfer tubes 3, scraping off the fouling materials (adherents) from the outer peripheral surfaces of the heat transfer tubes 3. The scraped fouling materials fall onto the scraper plate 10 or the lower tube plate 7. Furthermore, the fouling materials adhering to the inner peripheral surface of the body tube 2 are also scraped off by the outer peripheral edge of the scraper plate 10 and fall onto the scraper plate 10 or the lower tube plate 7.

[0073] It is preferable that scraper plates 10A to 10C are moved upward until scraper plate 10A abuts against upper tube plate 6, and scraper plate 10C is moved downward until it abuts against lower tube plate 7. After each of scraper plates 10A to 10C has been moved up and down a specified number of times, scraper plate 10A is positioned so that its upper surface is at approximately the same level as or slightly higher than the lower edges of supply and discharge ports 8a and 8b.

[0074] In this state, a fluid is blown from one supply / discharge port 8a to the other supply / discharge port 8b, and the contaminants that have accumulated on scraper plate 10A flow out of supply / discharge port 8b along with the fluid, so that almost no contaminants remain on scraper plate 10A.

[0075] When blowing, it is desirable to switch the direction of the airflow between the inflow supply / discharge port 8a and the outflow supply / discharge port 8b so as not to allow dirt to accumulate in the same place.

[0076] To blow out the contaminants accumulated on the lower tube plate 7, the scraper plate 10C is positioned higher than the supply and discharge ports 9a and 9b. In this state, a fluid is blown from one supply and discharge port 9a to the other supply and discharge port 9b. When this is done, the contaminants accumulated on the lower tube plate 7 flow out of the supply and discharge port 9b along with the fluid, and almost no contaminants remain on the lower tube plate 7.

[0077] To blow out the contaminants accumulated on the scraper plate 10C, the scraper plate 10C is lowered to above the lower tube plate 7, and then a fluid is blown from one inlet / outlet 9a to the other inlet / outlet 9b. The contaminants accumulated on the scraper plate 10C are then carried away by the fluid and flow out of the inlet / outlet 9b, leaving almost no contaminants remaining on the scraper plate 10C. In these cases, too, it is desirable to reverse the flow direction between the inlet inlet / outlet 9a and the outlet inlet / outlet 9b when blowing to prevent contaminants from accumulating in the same place.

[0078] The dirt material accumulated on scraper plate 10B falls onto scraper plate 10C by the flow in chamber 20 and is discharged by the blow of scraper plate 10C.

[0079] After the blowing is completed, the original state shown in FIG. 1 is restored and normal operation is resumed, or the scraping and blowing steps are further repeated.

[0080] In this way, the fouling substances adhering to the heat transfer tubes 3 and the like can be sufficiently removed, and the scraped fouling substances can be quickly discharged outside the body tube 2.

[0081] The second fluid may be, but is not limited to, the inlet water of the biological treatment device or hot water pumped up from underground. The second fluid may be used as the washing water for blowing, or another fluid may be used.

[0082] Although the outer peripheral surface of the wire rope W is uneven, in this heat exchanger 1, the wire rope W is inserted through the wire rope insertion pipes 30 to 35, and in the traction machine 40, the wire rope W is hung in the circumferential groove 43b of the rotor 43, and the rotor 43 is surrounded by wire rope guide blocks 46A, 46B, etc., so the wire rope W is not exposed to the atmosphere. Therefore, the first fluid in the chamber 20 does not leak to the outside, and the atmosphere does not enter the chamber 20.

[0083] In this traction machine 40, the wire rope W is hung in the circumferential groove 43b of the rotating body 43, so the wire rope W curves gently along the outer periphery of the rotating body 43, but is not bent at an acute angle or pinched tightly, so the durability of the wire rope W is also good.

[0084] [Second embodiment] In the heat exchanger 1 shown in Figure 1, the wire rope guide pipes 30 to 35 are connected in a loop shape via the traction machine 40, and only one traction machine 40 is installed, but in the second embodiment shown in Figure 9, traction machines 40, 40 are arranged on both the upper and lower sides of the body tube 2, and straight wire rope guide pipes 30, 35 are connected to one end of each traction machine 40, 40.

[0085] The first wire rope W extending upward from the body tube 2 is pulled upward by the upper traction machine 40. The second wire rope W extending downward from the body tube 2 is pulled downward by the lower traction machine 40.

[0086] In this second embodiment, a sealing structure 50 is connected to the other end of each of the traction machines 40, 40, as shown in Figure 10. This sealing structure 50 has a container (sealed container) 52 connected to the other end of the traction machine 40 via a tubular portion 51. The end side of the wire rope W is housed in the container 52 through the tubular portion 51. A predetermined length of the end side of the wire rope W is housed in the container 52.

[0087] In FIG. 10, when the wire rope W moves upward, the amount of wire rope remaining in the container 52 decreases, and when the wire rope W moves downward, the amount of wire rope remaining in the container 52 increases.

[0088] Since the traction machines are installed in two locations, one above the other, the rotation of both traction machines 40, 40 is linked, or when one traction machine 40 is winding the wire rope, the other traction machine 40 allows the rotating body 43 to rotate freely in the direction of pulling out the wire rope (for example, by a ratchet mechanism).

[0089] [Third embodiment] In the present invention, when traction machines 40, 40 are arranged on both the upper and lower sides of the body tube 2 as in the second embodiment of Figure 9, the rotating body within the traction machine 40 may be a rotating body 60, 70 for winding the wire rope as shown in Figure 11 or Figures 12 and 13.

[0090] The rotor 60 in FIG. 11 has a through hole 61 perpendicular to the axial direction inside, and a protrusion 62 is formed inside this through hole 61 as an engagement portion for hanging a wire. The end of the wire rope is wound around the protrusion 62, or the tip of the wire rope is previously formed into a ring and the ring is hung on the protrusion 62 to secure it. Note that instead of a through hole, a non-through recess may be provided. Also, it is preferable in terms of manufacturing efficiency and mechanical strength that both the through hole and the recess be perpendicular to the axial direction, but this is not limited thereto. Reference numeral 63 denotes a key groove. Reference numeral 64 denotes a spirally formed wire rope winding groove. Note that a deep groove may be provided instead of a spiral groove.

[0091] The rotor 70 in Figures 12 and 13 has threaded protrusions 72 that are fastened with a nut-like locking member 75 after the wire rope is hooked onto the protrusions 72. Note that Figure 13 shows the rotor 70 with the locking member 75 removed. The rotor 70 has a through hole 71 that is perpendicular to the axial direction, and a bolt-like protrusion 72 protrudes from the inner peripheral surface of this through hole 71. Reference numeral 73 denotes a key groove, and 74 denotes a wire rope winding groove.

[0092] A guide portion 76 extending in the circumferential direction (toward the equator) is provided on the outer peripheral surface of the rotor 70. The guide portion 76 slides against the inner surface of the rotor housing portion of the towing machine, stabilizing the rotational movement of the rotor.

[0093] No sealing structure is provided in the traction machine using the rotors 60, 70 for winding the wire rope shown in Figure 11 or Figures 12 and 13. Also, the small holes 46b are not provided in the block 46B.

[0094] In the embodiment of Figure 11 or Figures 12 and 13 above, the wire rope W is engaged with the through hole and hung in the circumferential groove 43b, but the wire may also be clamped with a jig such as a U-shaped nail and inserted into the groove to fix it.

[0095] The above embodiment is merely an example of the present invention, and the present invention may have other configurations. For example, four supply and discharge ports for the second fluid may be provided at equally spaced positions in the circumferential direction, so that blowing can also be performed in a direction perpendicular to the blowing direction in the case of two ports. [Explanation of symbols]

[0096] 1 heat exchanger 2 Body tube 3 Heat transfer tubes 4,5 First fluid supply / discharge port 6 Upper tube plate 7 Lower tube plate 8,9 Second fluid supply / discharge port 10 scraping board 11,12 Convex part 13 Flow hole 14 Through holes 15 Piston rod 15p Rod insertion tube 16 cylinders 17 wires 20 Chamber 21,22 Supply / discharge room 30~35 Wire rope guide tube 40 Traction machine 42 Case 43 Rotating body 43a Keyway 43b Circumferential groove 43t protrusion 44 shaft rod 44a Key section 45A, 45B guide Blocks 46A and 46B 46a,46b small hole 49 O-ring 50 Sealing structure 52 Container 60,70 Rotating body 61,71 through holes 62,72 protrusion 63,73 Keyway 64,74 Wire rope winding groove 75 Locking member

Claims

1. A moving device for moving a scraper plate for scraping off fouling materials from the outer peripheral surface of a heat transfer tube, the scraper plate being movably installed in a heat exchanger, by a wire rope and a traction device for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, and is provided with a first wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, and a second wire rope insertion hole for guiding the wire rope from the other end face of the towing machine to the rotating body, A scraper plate moving device in a heat exchanger, in which the wire rope moves from the first wire rope insertion hole to the second wire rope insertion hole or vice versa by rotating the rotating body.

2. 2. The device for moving a scraper plate in a heat exchanger according to claim 1, wherein a shaft for rotating said rotor is provided protruding from said traction machine.

3. 2. The device for moving a scraper plate in a heat exchanger of claim 1, comprising: a first tubular body for guiding the wire rope, which guides the wire rope extending from one end of the heat exchanger to the first wire rope insertion hole; and a second tubular body for guiding the wire rope, which guides the wire rope extending from the other end of the heat exchanger to the second wire rope insertion hole.

4. 4. The device for moving a scraper plate in a heat exchanger according to claim 3, wherein the first tubular body and the second tubular body extend in a U-shape or semicircular arc shape of 0.01 R or more, or have no corners of 0.01 R or less.

5. A body tube and a plurality of heat transfer tubes arranged in parallel within the body tube; a scraper plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; a moving device for a scraper plate in a heat exchanger according to any one of claims 1 to 4, for moving the scraper plate back and forth via a wire rope; A heat exchanger having

6. A moving device for moving a scraper plate for scraping off fouling materials from the outer peripheral surface of a heat transfer tube, the scraper plate being movably installed in a heat exchanger, by a wire rope and a traction device for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, a first wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, and a second wire rope insertion hole for guiding the wire rope from the other end face of the towing machine to the rotating body; a sealing structure surrounding the wire rope extending from the second wire rope insertion hole, A scraper plate moving device in a heat exchanger, in which the wire rope moves through the first wire rope insertion hole and the second wire rope insertion hole into the sealing structure by rotating the rotating body.

7. 7. The device for moving a scraper plate in a heat exchanger according to claim 6, wherein a shaft for rotating said rotor is provided projecting from said traction machine.

8. 7. The device for moving a scraper plate in a heat exchanger according to claim 6, further comprising a tubular body for guiding the wire rope extending from the heat exchanger to the first wire rope insertion hole.

9. A heat exchanger comprising two scraper plate movement devices (hereinafter referred to as movement devices in this claim) (hereinafter referred to as a first movement device and a second movement device) in the heat exchanger according to any one of claims 6 to 8, wherein the heat exchanger comprises: A body tube and a plurality of heat transfer tubes arranged in parallel within the body tube; a scraping plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; It is equipped with The scraper plate is moved in one direction by the first moving device via a first wire rope, and the scraper plate is moved in the other direction by the second moving device via a second wire rope extending in the opposite direction to the first wire rope. heat exchanger.

10. A moving device for moving a scraper plate for scraping off fouling materials from the outer peripheral surface of a heat transfer tube, the scraper plate being movably installed in a heat exchanger, by a wire rope and a traction device for the wire rope, The towing machine has a rotating body installed therein, around whose outer circumferential surface a wire rope is wound, and has a wire rope insertion hole for guiding the wire rope from one end face of the towing machine to the rotating body, A device for moving a scraper plate in a heat exchanger, in which the wire rope is passed through the wire rope insertion hole and wound around the rotating body by rotating the rotating body.

11. 11. The device for moving a scraper plate in a heat exchanger according to claim 10, wherein a shaft for rotating said rotor is provided protruding from said traction machine.

12. 11. The device for moving a scraper plate in a heat exchanger according to claim 10, further comprising a tubular body for guiding the wire rope extending from the heat exchanger to the wire rope insertion hole.

13. 11. The device for moving a scraper plate in a heat exchanger according to claim 1, 6 or 10, wherein a spiral groove for winding a wire rope is provided on the outer circumferential surface of said rotor.

14. 11. The device for moving a scraper plate in a heat exchanger of claim 1, 6 or 10, wherein the rotating body has a through hole or a recess in a direction different from the axial direction, and a locking portion for locking the tip of the wire rope is provided in the through hole or the recess.

15. A heat exchanger comprising two scraper plate movement devices (hereinafter referred to as a first movement device and a second movement device) in the heat exchanger according to claim 10 or 11 (hereinafter referred to as a movement device in this claim), wherein the heat exchanger comprises: A body tube and a plurality of heat transfer tubes arranged in parallel within the body tube; a scraping plate having a through hole through which the heat transfer tube is inserted and capable of moving back and forth in the extending direction of the heat transfer tube; It is equipped with The first wire rope connected to the scraper plate is wound around the rotating body of the first moving device to move it in one direction, and the second wire rope connected to the scraper plate and extending in the opposite direction to the first wire rope is wound around the rotating body of the second moving device to move it in the other direction. heat exchanger.

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