JP2021080750A - Dust remover - Google Patents

Abstract

To provide a guide plate that suppresses pulsation when a carrying chain rotates without changing the design of a sprocket wheel or the like.SOLUTION: The present invention relates to a dust remover in which a net frame provided with a dust trapping screen is joined to a pair of left and right endless carrying chains 12 so as to cross a water channel in the width direction, and the carrying chains 12 are rotated via upper and lower sprocket wheels, and comprises a guide plate 15 suppressing the pulsation that occurs when a teeth 16 of the upper sprocket wheel 13 and the rollers of the carrying chain 12 begin to mesh and the dust trapping screen rises beyond the horizon passing through the axis of the upper sprocket wheel 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust remover installed for the purpose of removing foreign substances such as dust in water when water is taken from the sea or river or when water is purified.

In power plants such as thermal power plants, intake stations are located for use as cooling water from rivers and the sea. The collected water may contain dust and aquatic organisms and cannot be used as it is. Therefore, at the water intake, a dust remover that works to capture dust and aquatic organisms in the water is installed.

The dust remover is installed vertically or at an angle to the water flow so as to cross the intake channel in the width direction, and in a power plant with a large amount of water intake, the screen with the wire mesh is rotated continuously. A continuous rotary dust remover that captures dust and pulls it up onto the water is used.

FIG. 6 is a perspective view of a general continuous rotation type dust remover. As shown in the figure, the dust remover 100 has a pair of left and right carrying chains 102 in an endless manner, and screens 104 provided for each link so as to cross the water channel to the left and right (width direction) are vertically or inclined with respect to the water flow. It has an attached structure. Further, the carrying chain 102 functions to capture dust and the like in running water by rotating the screen 104 up and down with respect to the depth direction of the water channel via the upper sprocket wheel and the lower sprocket wheel 103.

The upper and lower sprocket wheels of the dust remover consist of a sword and a flat part. In other words, the tooth part of the sprocket wheel that meshes with the roller connecting the link of the carrying chain corresponds to the sword. Conventionally, the number of teeth of the sprocket wheel is 6, and when the tips of the teeth (sword part) are connected by a straight line, it becomes a regular hexagon. The teeth of the sprocket wheel, which is the apex of this regular hexagon, and the rollers of the link pin portion that connects the link of the carrying chain mesh with each other, and the sprocket wheel rotates, so that the net frame on the upstream side of the water channel is lifted and rotates around. In this way, the dust trapping screen repeatedly immerses and pulls up in the water to capture the dust in the water.
At this time, the circumferential rotation speed fluctuated due to the change in the distance between the center of rotation of the sprocket wheel and the center of the carrying chain that moved up and down, and the carrying chain was pulsating.

As the amount of electricity generated increases, more cooling water is required, so the dust remover must be operated continuously to remove dust. Especially in the summer when power consumption is high, the amount of water intake increases, so its function becomes important. However, in the summer, the amount of dust tends to increase due to the occurrence of jellyfish, and improvement of the dust removal and recovery capacity is required. ing.

However, if the peripheral rotation speed of the carrying chain is increased in order to increase the dust collection capacity, the link chain suspended between the upper sprocket wheel and the lower sprocket wheel pulsates violently, generating noise and premature wear of the sliding parts of the device. Therefore, the peripheral rotation speed of the existing dust remover is limited to about 8 (m / min).

Therefore, as disclosed in Patent Document 1, by increasing the number of teeth of the sprocket wheel and shortening the distance between the teeth (sword part) and the teeth (flat part) of the sprocket wheel, the pulsation of the carrying chain A device for reducing the problem has been proposed. Specifically, the number of teeth of the sprocket wheel is increased from 6 to 12, and the length of the link of the carrying chain is halved to suppress speed fluctuations and reduce noise. As a result, the peripheral rotation speed can achieve a maximum of 16 (m / min).

In this way, a configuration that halves the length of the link of the carrying chain shortens the distance of one pitch between the links, so the size of the wire mesh or bucket that can be installed can be reduced with the normal chain structure. Even if there is no choice but to increase the peripheral rotation speed, the small size of the wire mesh and bucket cannot be expected to improve the dust collection capacity.
Therefore, in order not to reduce the dust collection capacity, it has been proposed to use a special chain to attach a wire mesh or bucket of the same size as that installed in the existing dust remover every two pitches of the link.

Japanese Unexamined Patent Publication No. 5-311628

However, as the number of rollers and links increases, not only will more parts be replaced during maintenance, but it is also necessary to adopt a special chain with low marketability in order not to reduce the dust collection capacity, so installation and maintenance It is costly and time-consuming.
In addition, as the number of pivotal points between links and the pivotal fulcrums of each link and basket increases with the number of links, the noise may increase synergistically.

In order to solve the above problems, as a first means, the present invention joins a pair of left and right endless carrying chains with a net frame provided with a dust trapping screen so as to cross the water channel in the width direction.
In a dust removing device in which the carrying chain rotates via the upper and lower sprocket wheels to scoop up and remove dust in water.
To suppress the pulsation that occurs when the teeth of the upper sprocket wheel and the rollers of the carrying chain begin to mesh and the dust trapping screen rises across the horizon passing through the axis of the upper sprocket wheel.
An object of the present invention is to provide a dust removing device including a guide plate pressed against a carrying chain from an upstream side between the upper sprocket wheel and the water surface.
According to the first means, since the pulsation of the carrying chain can be suppressed, noise can be reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

In order to solve the above problems, as a second means, in the first means, in the first means, the portion of the pair of left and right carrying chains that advances upward toward the upper sprocket wheel is provided from the upstream side. It is an object of the present invention to provide a dust removing device, which comprises a pair of left and right guide plates that are pressed against each other.
According to the second means, since the pulsation of the carrying chain can be suppressed, noise can be reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

In order to solve the above problems, as a third means, in the first or second means, the upper end of the guide plate is directly below the position where the teeth of the upper sprocket wheel and the rollers of the carrying chain start to mesh with each other. When the length of the radius of the upper sprocket wheel of the dust remover, which is characterized by being located, is r (mm),
The upper end of the guide plate is identified as being located at a point vertically downward a (mm) from the center of the upper sprocket wheel and further horizontally b (mm) in the upstream direction, and a = r × cos 60 °, b. It is an object of the present invention to provide a dust removing device characterized in that it is required from = r × sin 60 °.
According to the third means, the positional relationship between the upper sprocket wheel and the guide plate is defined, and the pulsation of the carrying chain can be reliably suppressed, so that noise is reduced while preventing premature wear of the sliding portion of the device. it can. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

In order to solve the above problem, as a fourth means, in the third means, the upper end of the guide plate is located directly below the position where the teeth of the sprocket wheel and the roller of the carrying chain start to mesh with each other. It is to provide a featured dust remover.
According to the fourth means, since the pulsation of the carrying chain can be suppressed, noise can be reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

In order to solve the above problems, as a fifth means, in the first means, the present invention responds to the tension adjustment of the carrying chain.
It is an object of the present invention to provide a dust removing device characterized in that the guide plate can be moved and adjusted in the vertical direction.
According to the fifth means, the take-up unit moves the shaft up and down during maintenance, and when the tension of the chain is adjusted, the position where the rollers of the carrying chain start to engage moves in the vertical direction, so the guide plate is pressed against it. The upper end of the guide plate can be moved and adjusted in the vertical direction so that the upper end of the guide plate is located directly below the position where the rollers of the carrying chain start to mesh with each other so as not to impair the effect. As a result, even when the tension of the carrying chain is adjusted, the pulsation of the carrying chain can be suppressed by the guide plate, so that noise can be reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

In order to solve the above problems, as a sixth means, in the first means, the upper sprocket wheel having six teeth and the roller of the carrying chain start to mesh with each other, and the shaft of the upper sprocket wheel To suppress the pulsation that occurs when the debris trapping screen rises across the horizon through the heart.
A guide plate having a length of 800 (mm) in the longitudinal direction pressed against the carrying chain from the upstream side is provided between the upper sprocket wheel and the water surface.
The upper end of the guide plate is characterized by being located at a point where the upper sprocket wheel having a radius of 600 (mm) has moved 300 (mm) vertically downward from the center and 520 (mm) horizontally moved upstream. The purpose is to provide a dust remover.
According to the sixth means, since the pulsation of the carrying chain can be suppressed, noise can be reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, which leads to an improvement in the dust collection ability.

According to the present invention, since the pulsation generated when the carrying chain rotates by pressing the guide plate is suppressed, noise is reduced while preventing premature wear of the sliding portion of the device. As a result, the peripheral rotation speed can be increased, and the dust collection ability is improved.
In addition, since there is no need to change the number of teeth of the sprocket wheel or the length of the link of the carrying chain, there is no cost and labor for installation and maintenance.

It is a side view of the partial structure of the dust removal device of this invention. It is a side view of the partial structure of a conventional dust remover. It is a side view of a sprocket wheel. It is a locus diagram which showed the locus of the roller and the upper sprocket wheel of the carrying chain of the dust removal device of this invention. It is a locus diagram which showed the locus of the roller and the upper sprocket wheel of the carrying chain of the conventional dust remover. It is a perspective view of the conventional dust removal device.

The dust remover of the present invention will be described in detail below with reference to the accompanying drawings.
[Partial structure 10 of the dust remover of the present invention and partial structure 11 of the conventional dust remover]
1 and 2 are side views of the upper sprocket wheel 13 and the carrying chain 12 extracted from the partial structure 10 of the dust remover provided with the guide plate 15 of the present invention and the partial structure 11 of the conventional dust remover. .. As shown in the figure, the guide plate 15 is pressed against the upstream carrying chain 12 which is lifted upward and travels among the carrying chains 12 configured to straddle the upper sprocket wheel 13.

When the carrying chain 12 is rotating around in conjunction with the upper sprocket wheel 13 as the lower sprocket wheel rotates together, the space between the teeth of the upper sprocket wheel 13 having six teeth 16 (sword part). The state in which 17 (flat portion) is at the top is defined as state I, and the state in which the teeth 16 are at the top is defined as II. The states of FIGS. 1 and 2 indicate state I, and the states of FIGS. 4 and 5 indicate state II.
As the sprocket wheel rotates, the change from state I to state II (or from state II to state I) is repeated. The guide plate 15 functions in the process of changing from the state II to the state II via the state I.

[Trajectory 21 of conventional dust remover]
FIG. 5 is a locus diagram showing a locus 22 of a roller of a carrying chain of a conventional dust remover and a locus 24 of an upper sprocket wheel. As shown, the upper sprocket wheel rotates clockwise while drawing a locus 24. Along with this rotation, the carrying chain is lifted and rotated by engaging the rollers.

The trajectory when moving from 26B, which is the 8 o'clock position where the upper sprocket wheel and the roller of the carrying chain start to mesh, to 26A, which is the 10 o'clock position where the sprocket wheel rotates and the carrying chain is lifted and raised, has a radius. It moves while drawing a 600 (mm) 60 ° fan-shaped arc.
At this time, the vibration is transmitted to the carrying chain before it bites into the upper sprocket wheel, and pulsates so as to draw a roller locus 22 in which a plurality of fan-shaped arcs convex in the water flow direction are connected.

[Trajectory of dust remover equipped with guide plate 15]
FIG. 4 is a locus diagram showing a locus 22 of a roller of a carrying chain of a dust removing device provided with a guide plate 15 of the present invention and a locus 24 of an upper sprocket wheel. The guide plate 15 is provided to suppress pulsation. As a result, noise can be reduced while preventing premature wear of the sliding portion of the device, so that the peripheral rotation speed can be increased and the dust collection ability is improved.

[Guide plate 15]
The guide plate 15 is pressed horizontally from the upstream side in order to suppress the pulsation of the carrying chain.
The guide plate 15 is required to be installed above the water surface, not underwater. When installed in water, the guide plate 15 becomes a water flow resistance at the time of water intake and is corroded by water, which leads to an increase in the number of maintenances. Therefore, it is desirable that the guide plate 15 is installed between the upper sprocket wheel and the water surface.

上部スプロケットホイール１３の中心から垂直下方向へａ（ｍｍ）、さらに上流方向へ水平にｂ（ｍｍ）移動したポイントに位置すると特定される。
半径の長さｒ（ｍｍ）は、図３に示すように上部スプロケットホイールの中心から、歯１６が有する２角を線で結んだ曲線（破線部）の中間までの距離を表す。 The position of the upper end of the guide plate 15 is obtained from Equation 1 and Equation 2 when the radius length r (mm) of the upper sprocket wheel 13 is used.

It is specified to be located at a point moved vertically downward by a (mm) from the center of the upper sprocket wheel 13 and further horizontally by b (mm) in the upstream direction.
The length r (mm) of the radius represents the distance from the center of the upper sprocket wheel to the middle of the curve (broken line portion) connecting the two corners of the tooth 16 with a line as shown in FIG.

As shown in FIG. 4, the upper end of the guide plate 15 is located directly below 26B, which is the 8 o'clock position where the upper sprocket wheel and the roller of the carrying chain start to mesh.
That is, when the length of the upper sprocket radius is r = 600 (mm), the upper end of the guide plate 15 is 300 (mm) downward from the center of the upper sprocket wheel 13 in the vertical downward direction (water bottom direction), and further in the water flow direction. It is located at a point that has moved horizontally (upstream) by 520 (mm). This position may be in the range of ± 50 (mm) in the vertical direction from the point.

The guide plate 15 extends vertically downward (toward the bottom of the water) from the point at the upper end of the guide plate 15, and is long enough to suppress at least one of the arcs of the roller locus 22 generated by the pulsation. Is needed. Therefore, the length of the guide plate 15 in the longitudinal direction must be longer than the chord length of the arc, 600 (mm), and must be at least 800 (mm).

The surface of the guide plate 15 that comes into contact with the carrying chain 12 wears as the operating time of the dust remover becomes longer. Therefore, as the material used for the guide plate 15 to be used, wear-resistant steel, alloy, or a metal having wear resistance subjected to surface treatment (quenching, nitriding, etc.) is preferable.
Further, the material of the guide plate 15 is not limited to metal, and may be ultra-high molecular weight polyethylene, which is a resin having wear resistance.

In the existing method, there is a means for providing a guide plate from the downstream side (from the direction facing the water flow direction). Therefore, in combination with the present invention, a guide plate may be provided from the downstream side as in the existing method.
That is, of the carrying chain 12 straddling the upper sprocket wheel 13, the carrying chain 12 on the upstream side is sandwiched between two guide plates from two directions, the upstream side and the downstream side, and a rail for the carrying chain to advance is provided. By forming it, the effect of suppressing pulsation becomes even greater.

When the operating time becomes long, the carrying chain 12 stretches and loosens, so that it becomes necessary to adjust the tension of the carrying chain 12. The guide plate 15 can be moved and adjusted in the vertical direction according to the tension adjustment of the carrying chain 12.
For example, for maintenance against slack, at least one link constituting the carrying chain 12 is removed to shorten the overall length and eliminate the slack. In this case, since the position of the carrying chain 12 that rotates around the surface rises as a whole, the guide plate 15 is required to adjust its movement in the upward direction.
The adjustment range is such that the upper end of the guide plate 15 can move up to 150 (mm) vertically upward and 100 (mm) vertically downward with reference to the point.

The present invention is particularly useful in a screen rotary dust remover equipped with a wire mesh for catching dust in a water intake facility such as a plant.

10 Partial structure of the dust remover provided with the guide plate of the present invention 11 Partial structure of the conventional dust remover 12, 102 Carrying chain 13 Upper sprocket wheel 15 Guide plate 16 Sprocket wheel teeth 17 Sprocket wheel tooth spacing 20 Guide of the present invention Trajectory of dust remover with plate 21 Trajectory of conventional dust remover 22 Trajectory of roller 24 Trajectory of sprocket wheel 26A Roller that meshed with upper sprocket wheel 26B Roller that began to mesh with upper sprocket wheel 100 Dust remover 101 Housing 103 Lower sprocket Wheel 104 screen

Claims (6)

A net frame equipped with a dust trapping screen is joined to a pair of left and right endless carrying chains so as to cross the waterway in the width direction.
In a dust removing device in which the carrying chain rotates via the upper and lower sprocket wheels to scoop up and remove dust in water.
To suppress the pulsation that occurs when the teeth of the upper sprocket wheel and the rollers of the carrying chain begin to mesh and the dust trapping screen rises across the horizon passing through the axis of the upper sprocket wheel.
A dust removing device including a guide plate pressed against a carrying chain from the upstream side between the upper sprocket wheel and the water surface. In the dust removing device according to claim 1,
A dust removing device characterized in that a pair of left and right guide plates pressed from the upstream side is provided on a portion of the pair of left and right carrying chains that advances upward toward the upper sprocket wheel. In the dust removing device according to claim 1 or 2, when the radius length r (mm) of the upper sprocket wheel is set.
The upper end of the guide plate was identified as being located at a point that moved a (mm) vertically downward from the center of the upper sprocket wheel and b (mm) horizontally further upstream.

A dust remover characterized by being more sought after. In the dust removing device according to claim 3,
A dust remover characterized in that the upper end of the guide plate is located directly below the position where the teeth of the sprocket wheel and the rollers of the carrying chain start to mesh with each other. In the dust removing device according to claim 1,
Depending on the tension adjustment of the carrying chain,
The guide plate is a dust remover that can be moved and adjusted in the vertical direction. In the dust removing device according to claim 1,
To suppress the pulsation that occurs when the upper sprocket wheel with six teeth and the roller of the carrying chain start to mesh and the dust trapping screen rises beyond the horizon passing through the axis of the upper sprocket wheel.
A guide plate having a length of 800 (mm) in the longitudinal direction pressed against the carrying chain from the upstream side is provided between the upper sprocket wheel and the water surface.
The upper end of the guide plate is characterized by being located at a point where the upper sprocket wheel having a radius of 600 (mm) has moved 300 (mm) vertically downward from the center and 520 (mm) horizontally moved upstream. Dust removal device.

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