JP2002062090A - Dust removal device for plate-type orthogonal heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust remover, in which the weight of a dust-removing scraper 10 is reduced, an angle of rotation is made small, and the rocking balance is improved. SOLUTION: Triangle frames 33 and 34 are formed in which respective vertexes are pivoted to upper and lower pivots 13 and 16. Rocking shafts 15, 18 are pivoted parallel with each other as bases of the triangle frames. A scraper having slots 19, 20 is fit correspondingly to the upper and lower shafts 15, 18. The length of the longer diameter of the slot is at least two times the diameter D of the rocking shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device for a plate heat exchanger for recovering waste heat.

[0002]

2. Description of the Related Art A heat exchanger equipped with a swing type dust scraper is known as a means for removing dust adhering to a plate surface on an exhaust gas passage side of a plate type heat exchanger. A conventional scraper is configured to be strong because a compressive force or a tensile force is applied at the time of swinging, and the weight of the entire scraper device is large and the driving energy efficiency is low.

[0003]

SUMMARY OF THE INVENTION In the present invention, the scraper itself is made of a relatively thin plate to reduce the total weight and improve energy efficiency, and the scraper is bent when it comes into contact with a fixed substance on the heat exchange plate wall surface. It is intended to provide a dust scraper device capable of preventing deformation or application of a compressive force to the scraper during operation of the scraper, and further improving the balance of weight or driving torque viewed from the drive shaft. To provide. INDUSTRIAL APPLICABILITY The plate-shaped scraper according to the present invention is not only applicable to a conventional interlocking swing device, but is also effective when applied to a swing device using a triangular frame.

[0004] The device of the present invention comprises a driving rotary shaft that rotates forward and backward within a predetermined angle range, a pair of upper and lower rocking mechanisms mounted on the rotary shaft and provided with an interlocking mechanism, and the rocking mechanism in the waste gas passage. In a plate-type heat exchanger provided with a scraper that is installed substantially vertically between the moving mechanisms, a scraper plate having a vertically long hole whose major axis is at least twice the diameter of the oscillating shaft on the oscillating shaft constituting the oscillating mechanism is provided. A dust removing device which is fitted, further comprising a pair of upper and lower rocking mechanisms provided in parallel between the bottom sides of the pair of triangular frames, and the tops of the pair of triangular frames being pivoted about a rotation axis. A dust removing device having a swing mechanism attached thereto, wherein a lower gap length in the upper vertical hole of the scraper plate is longer than a lower gap length of the lower vertical hole so that no compressive force is applied to the scraper plate in any case. Structure One in which the. Further, by forming a parallel link with the bottom side of the triangular frame as one side, a swing shaft interlocking mechanism can be easily configured in the machine. Further, the scraper plate has a large number of projections on the side facing the waste gas passage side surface.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a plate type heat exchanger.
For example, 1 is a main body, 2 is an outside air intake, 3 is an exhaust duct, 4 is a high temperature waste gas inlet, and 5 is a waste gas outlet. 6
Is an orthogonal heat exchange plate or duct unit disposed in a waste gas passage 7 in the machine, 8 is an air passage, 9 is a plate wall surface on the gas passage side, and 9a is a gas passage side surface. 10
Is an oscillating scraper disposed in the gas passage along the plate wall surface 9 and reciprocates in the width direction when the upper oscillating mechanism 11 and the lower oscillating mechanism 12 rotate within a predetermined angle range. Reference numeral 13 denotes a driving-side rotating shaft, 14 denotes a pair of crank arms, 15 denotes a swinging shaft, 16 denotes a driven-side rotating shaft provided below, 17 denotes a crank arm provided at a shaft end, and 18 denotes a swinging shaft. It is. A forward / reverse rotation motor or a hydraulic cylinder is used as the driving device, and a known mechanism such as a chain sprocket or a link bar is used for the interlocking mechanism, but is omitted in the drawing. The scraper 10 is composed of one or a plurality of flat plate members, and has a vertically elongated hole 1 for fitting a swing shaft at an upper portion and a lower portion, respectively.
9 and 20 are provided.

The relationship between the swing shafts 15, 18 and the longitudinal shafts 19, 20 is as shown in FIG. 4 and the major diameters M1, M2 of the respective longitudinal holes.
Is greater than twice the swing shaft diameter D, and the lower gap length A of the upper vertical hole 19 is longer than the lower gap length B of the lower vertical hole 20 when the scraper plate is suspended. It is preferable that an upper gap length C be present in the lower elongated hole 20. Accordingly, it is preferable that M2 ≧ M1. L1 is the distance between the centers of the vertically long holes, and L2 is the distance between the swing axes.

In a state where a resistance load such as a fixed dust is not applied to the scraper plate 10, the scraper plate swings in a state of being suspended on the upper swing shaft 15 (FIG. 5A). The lower swing shaft 18 is interlocked slightly behind the upper shaft 15, but does not affect the movement of the scraper. When some resistance is applied to the scraper and the lowering of the scraper is prevented, both shafts 15 and 18 are both pivoted and lowered in the direction of the downward dotted arrow, and then only the lower swing shaft 18 is moved to the lower arc surface of the lower elongated hole 20. , And the scraper plate is pulled down in the direction of the solid arrow pointing downward (FIG. 5B). At this time, since the upper swing shaft 15 is not in contact with the lower end of the upper vertically long hole 19, no compressive force is applied to the scraper plate 10, so that there is no possibility that the scraper plate 10 is deformed even if it is thin. During the ascending period of the scraper plate, the upper swing shaft 15 comes into contact with the upper portion of the upper vertically long hole 19 earlier (FIG. 5A) and applies a pulling force in the upward solid arrow direction.

As is apparent from the above description, no matter what state the scraper plate is in, no compressive force is applied in the longitudinal direction and only a tensile force is always directed upward or downward. It can be configured. In addition, projections 10a for dust scraping protruding from the sides of the waste gas passage are provided on both sides of the plate.

FIG. 6 shows a removing device in which the weight of the scraper plate itself is reduced and the turning angle is reduced by providing a pair of left and right scrapers. That is, the scraper plate is divided into four bar members 30, and the upper plate 31 and the lower plate 32 are connected to the upper and lower sides of the bar member 30. The driving shafts 15, 15 and 18, 18 are fitted therein, and the tops of the upper and lower triangular frames are
3, 16 are attached. The operation of the scraper 10 in this device is the same as that of the above-described embodiment device, and therefore the description is omitted.

Reference numeral 35 denotes an interlocking link member made of a bar or a plate. The upper portion is fitted to the upper swinging shaft 15, and the lower portion is a lower elongated hole 3 similar to a scraper plate.
The lower swing shaft 18 is loosely fitted in the hole 7. The interlocking mechanism by the link member can be mounted in a high-temperature heat exchanger. Since the link members 35 are provided symmetrically on the left and right sides of the triangular frame, the left and right sides can be linked alternately only by the pulling force by appropriately selecting the position of the long hole 37 with respect to the lower swing shaft 18.

[0011]

According to the present invention, since no compressive force is applied to the scraper plate, the plate material can be made thinner and lighter, the power can be saved, and the surface of the heat exchange plate is not damaged. Further, by adopting a triangular frame for the swing mechanism and providing a pair of swing shafts, not only the swing rotation angle can be reduced to about な く, but also the left and right weight fluctuation can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view in which a part of a heat exchanger is broken.

FIG. 2 is a front view of the scraper rocking device in which an interlocking mechanism and a heat exchange unit are omitted.

FIG. 3 is a side view and a top view showing a scraper plate in a waste gas passage.

FIG. 4 is an explanatory diagram showing a positional relationship between a vertically long hole of a scraper plate and a swing shaft.

FIG. 5 is a diagram illustrating the operation of a scraper plate.

FIG. 6 is a front view of a triangular frame type scraper.

FIG. 7 is a perspective view of an upper swing mechanism.

FIG. 8 is a front view of an interlocking link member.

[Explanation of symbols]

 Reference Signs List 7 Waste gas passage 8 Air passage 9 Plate inner wall surface 9a Inner surface 10 Scraper 10a Projection 11 Upper swing mechanism 12 Lower swing mechanism 13, 16 Rotating shaft 15, 18 Swing shaft 19, 20 Vertical elongated hole 30 Scraper bar 31 Upper Plate 32 Lower plate 33, 34 Triangular plate 35 Linking link member 36 Fitting portion 37 Vertical hole A Lower gap length of upper vertical hole B Lower gap length of lower vertical hole C Upper gap length of lower vertical hole D Oscillating shaft diameter M1, M2 Longest hole of vertically long hole

Claims (6)

[Claims] A drive rotating shaft that rotates forward and backward within a predetermined angle range;
A plate-type heat exchanger including a pair of upper and lower rocking mechanisms which are attached to the rotating shaft and have an interlocking mechanism, and a scraper erected substantially vertically between the rocking mechanisms in the waste gas passage. A dust removing device, comprising a scraper plate having a vertically long hole whose major axis is at least twice the diameter of the swing shaft is fitted to the swing shaft constituting the swing mechanism. 2. A drive rotation shaft that rotates forward and backward within a predetermined angle range,
A plate-type heat exchanger including a pair of upper and lower rocking mechanisms which are attached to the rotating shaft and have an interlocking mechanism, and a scraper erected substantially vertically between the rocking mechanisms in the waste gas passage. The swinging shafts constituting the swinging mechanism are arranged in parallel between the bottom sides of the pair of triangular frames, and the tops of the pair of triangular frames are pivotally mounted on the rotating shafts. A dust removing device in which a scraper plate having a vertically long hole whose major axis is at least twice the diameter of the swing shaft is fitted. 3. The dust removing device according to claim 1, wherein a plurality of projections are provided on a side of the scraper plate facing the waste gas passage side surface. 4. The dust removing apparatus according to claim 1, wherein a lower gap length in the upper vertical hole is longer than a lower gap length in the lower vertical hole when the scraper plate is suspended. 5. The dust removing apparatus according to claim 1, wherein the scraper plate is constituted by a plurality of parallel bar members. 6. An upper swing shaft is fitted to an upper swing shaft on upper and lower swing shafts disposed in parallel between the bottom sides of a triangular frame, and a lower portion of the rod-shaped link member is freely connected to a lower swing shaft through a vertically elongated hole. The dust removing device according to any one of claims 2 to 5, wherein the fitted interlocking mechanism is provided in the heat exchanger.