JP4772084B2 - Hydraulically driven dust removal system - Google Patents

Description

The present invention relates to a water-powered dust removal system including a water channel such as a sand basin or a water tank of a hydroelectric power plant , and a hydraulically-driven dust remover installed in the water channel , and more particularly, a rake along a screen by a driving force of a water turbine. It is related with the hydraulic drive type dust removal system which moves up, scrapes up the dust adhering to a screen, and discharges.

  Conventionally, as a device for removing the dust flowing down the water channel flowing into the hydroelectric power station, the dust flowing down is received by a screen installed in the water channel, and the received dust is mechanically lifted along the screen by a rake. There is known a rake type dust remover that discharges water to a predetermined position above a water channel. This rake type dust remover includes a rake circulation type dust remover in which the rake circulates in one direction on an endless track. Specifically, in the above-described scraping, a plurality of rake teeth provided in the rake are inserted into a space between the parallel screen bars constituting the screen, and the dust that has drifted to the screen is scraped along with the movement of the rake. It is done by being issued.

  In the rake circulation type dust remover as described above, for example, endless chains are arranged on both the left and right sides of the screen installed in the water channel in a slanting vertical direction, and both ends of each rake are placed on these left and right chains. There is a structure in which the rake is circulated and moved along the screen by the circulation movement of the chain, and the dust that drifts to the screen is removed by scooping up the rake moving upward. And these conventional rake circulation type dust removers are provided with a drive sprocket for circulating the chain and a drive mechanism for driving the drive sprocket.

  By the way, an electric motor is generally used as a drive mechanism for driving a drive sprocket. However, an electric motor requires a power source, and when there is no power source nearby, an electric wire is drawn or a generator is provided. Had to do. Therefore, there is a problem that the installation cost is increased by the installation of the electric motor and the cost of electricity for driving the motor.

  Therefore, the water wheel was placed in the water channel and rotated using the water flow flowing through the water channel, and the rake was driven and circulated by the driving force of the water wheel to scoop up the dust trapped on the screen, and the dust remover was operated without power. Hydraulically driven dust removal systems are known. In this hydraulically driven dust removal system, a water wheel is disposed in a water channel immediately downstream of the screen, and is driven by a water flow that has passed through the screen.

  However, if the screen temporarily clogged up with a large amount of dust, the water flow is blocked and there is not enough water to pass through the screen. As a result, there is a problem in that the generated water wheel does not sufficiently rotate, and as a result, the driving force necessary for driving and circulating the rake cannot be obtained.

  In order to solve this problem, Patent Document 1 describes that, in addition to the main turbine installed on the downstream side of the main channel screen, an auxiliary turbine is installed in the spillway to supplement the driving force of the main turbine. There is described a hydraulically driven dust removal system capable of preventing a shortage of driving force for driving and circulating the rake.

JP-A-11-107249

  In the dust removal system of patent document 1, the spillway for installing an auxiliary water turbine as mentioned above is required. However, in a water channel such as a water tank or a sand basin of a hydroelectric power plant, there is a problem that it is practically difficult to secure a space for installing such a spillway. Moreover, in the conventional dust remover represented by the dust removal system of patent document 1, since the water wheel is provided downstream of the screen, foreign matters such as dust adhering to the rotating water wheel in the air pass through the screen. It will flow into the power plant without any change. Therefore, foreign matter may flow into the power plant side and adversely affect the power plant equipment.

  The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to stably scrape dust by a rake and to prevent foreign substances from flowing into a power plant more reliably. It is to provide a type dust removal system.

The hydraulic drive type dust removal system according to claim 1 for solving the above-mentioned problem is provided with a raised portion formed at the bottom of a water channel flowing into the hydroelectric power plant side, one end locked to the raised portion, and the other end of the raised portion. By engaging with the edge of the shore formed on the downstream side of the ridge, the inflow of dust installed so as to block the entire area of the channel cross-sectional area of the water channel in a state inclined at a predetermined angle with respect to the vertical direction. A blocking screen, a water wheel disposed upstream of the screen and pivotally supported at a height position similar to the edge of the shore, and driven by a water flow in the water channel, and driving of the water wheel Driven by the driving force transmitted by the water turbine through a transmission belt having one end connected to the shaft and a shore-side driving force transmission sprocket installed on the shore and connected to the other end of the transmission belt . On the screen The upper screen upstream trajectory is moved from the lower side to the upper side, and the upper end portion is moved to the upstream side and moved downward, and the lower end portion is moved to the downstream side so that the screen upstream trajectory is moved again. A rake having a plurality of rake teeth attached to the moving body, and attached to the circulating moving body so as to protrude toward the screen in a state where the circulating moving body is moving on the screen upstream track; The screen is configured in a comb shape by arranging a plurality of screen bars with a predetermined interval in the width direction of the water channel, and the rake teeth are configured such that the circulating moving body follows the screen upstream trajectory. When moving, it has a length that penetrates to the middle position of the space formed between the screen bars, and the transmission belt extends from the shaft support portion of the water wheel. Serial disposed Kishibe side driving force linearly toward the transmission sprocket, lowest point of the trajectory that the circulating member is moved, is approximately the same height as the locked one end to the raised portion of the screen It is characterized by that.

  According to the present invention, the rake attached to the circulation moving body driven by the water wheel is circulated and moved, so that the dust deposited on the screen is scraped and discharged. In the present invention, the water wheel is arranged at the upstream position of the screen, and in this case, the time taken until it is affected by the decrease in the flow velocity due to the clogging of the screen is slightly longer than that at the downstream position, In the case where the screen is clogged up temporarily due to a large amount of dust, a part of the dust deposited on the screen by the rake can be removed during a predetermined time until the upstream flow velocity is reduced. Accordingly, it is possible to prevent the rotation of the water turbine from stopping due to temporary drift of a large amount of dust onto the screen.

In the present invention, as described above, since the water turbine is located upstream of the screen, foreign matter such as dust adhering to the water turbine in the air does not flow into the power plant as it is in the past and is blocked by the screen. Therefore, the inflow of foreign matter to the power plant can be prevented. Furthermore, since dust is scraped out by inserting rake teeth into the space between the screen bars, dust that has drifted to the screen can be scraped out efficiently.

  According to the present invention, when the water wheel is provided upstream of the screen, when a large amount of dust is temporarily drifted on the screen and the screen is clogged, the water is floated on the screen by the rake before the upstream flow velocity decreases. Waste dust is removed. Accordingly, it is possible to prevent the water turbine from being stopped due to temporary drift of a large amount of dust onto the screen. Further, in the present invention, since the water wheel is provided upstream of the screen, foreign matter such as dust adhering to the water wheel in the air can be blocked by the screen, so that the inflow of foreign matter to the power plant can be prevented. Can do. In addition, in the system concerning this invention, since it is not necessary to install facilities like the above-mentioned auxiliary | assistant water turbine, it can be utilized also in limited spaces, such as a water tank of a hydroelectric power station.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic side view of a water channel of a power plant in which a hydraulically driven dust removal system according to the present embodiment is installed. FIG. 2 is a schematic cross-sectional view taken along the line II of the hydraulically driven dust removal system of FIG.

  As shown in the figure, a hydraulically driven dust removal system 10 is installed in a water tank 100 for storing water flowing in from a river, a pond or the like and supplying water to a downstream hydroelectric power plant, and prevents inflow of dust. A screen 12, a water wheel 14 disposed on the upstream side of the screen 12, a pair of chains 16-1 and 16-2 as circulation moving bodies driven and circulated by the water wheel 14, and a chain 16. A rake 18 that circulates along with the screen 16 and scrapes and discharges the dust 102 that has drifted along the screen 12 to the screen 12 is provided. The arrow A in the figure indicates the direction of water flow.

The screen 12 extends, for example, a plurality of screen bars 12a made of flat steel in the vertical direction of the water tank 100 in a state where a space 19 is formed at intervals in the width direction of the water tank 100 and is inclined slightly downstream. It is comprised by arrange | positioning so that it may exist. In particular, in the present embodiment, the screen bar 12a is provided in the water tank 100 so that the screen 12 extends along a partial region in the moving direction of the chain 16 driven by the water wheel 14, that is, the extending direction of the chain 16. It is provided in a state of being bridged between a raised ridge 24 at the bottom of the ridge and an edge 22 on the downstream side of the ridge 24 . Thereby, the water that has flowed into the water tank 100 from the upstream side always passes through the screen 12 and can prevent the dust from flowing into the power plant. The width of the space 19 between the screen bars 12a described above is, for example, about 2 cm.

  The water wheel 14 is installed on the upstream side of the screen 12 in the water tank 100 while being supported by both wall portions of the water tank 100, and the chain 16 is driven and circulated through the drive sprockets 28 and 30 by rotation thereof. The direction of this circular movement is indicated by an arrow B in the figure. As described above, since the water wheel 14 is located upstream of the screen 12, foreign matter such as dust adhering to the water wheel 14 in the air is blocked by the screen 12 without flowing to the power plant as it is in the conventional art. Inflow of foreign matter to the power plant side can be prevented.

  The water wheel 14 has a structure in which a plurality of wings 14 a are radially arranged on a drive transmission shaft 32 connected to the drive sprocket 28 via a transmission belt 26. For example, FRP (Fiber Reinforced Plastics) such as stainless steel, glass fiber reinforced plastic, carbon fiber reinforced plastic, boron fiber reinforced plastic, and aramid fiber reinforced plastic can be used as the material of the blade 14a of the water wheel 14.

The chains 16-1 and 16-2 are fixed to both ends of the water tank 100 via a bearing 31 ( upper end portion ) and a bearing 33 ( lower end portion ) attached to the drive sprocket 30. In the present embodiment, as described above, since the screen 12 extends along a partial region of the chain 16, the chain 16 is also installed with substantially the same inclination as the screen 12.

In the present embodiment, a plurality of rakes 18 are provided between the respective chains 16-1 and 16-2 so as to protrude outside the circulation track formed by each chain 16 (reference numerals 18-1 to 18-18). It is attached and is circulated and moved together with the chain 16 by driving the water wheel 14. Then, by the rake 18 on the side moving upward, that is, the rake 18-1 moving on the screen upstream trajectory on the side close to the screen 12 in FIG. It is discharged to the storage place 34. The rake 18 has a plurality of rake teeth 18 a formed to have a slightly smaller dimension than the space 19 so as to enter the middle position of the space 19 between the screen bars 12 a when the dust 102 is scraped up. In this way, the dust 102 is scraped out by inserting the rake teeth 18a into the space 19 between the screen bars 12, so that the dust 102 stuck to the screen 12 can be scraped out efficiently.

  In particular, in the present embodiment, the rake teeth 18a are distributed in different width direction regions for each of the rakes 18-1 to 18-4, and the entire rakes 18-1 to 18-4 are disposed between the screen bars 12a. It arrange | positions so that all the spaces 19 to be formed may enter. Specifically, in FIG. 2, the rake teeth 18a of the rake 18-1 are arranged so as to enter the four spaces 19 ′ near the center in the cross-sectional view of the screen 12, and the rake teeth 18a of the rake 18-2 are The rake teeth of the rake 18-3 and the rake 18-4 are arranged, for example, in the rake 18-1, respectively. The rake 18-2 may be similar to the rake 18-2, so that any one of the rake teeth 18a of the rakes 18-1 to 18-4 is formed between the screen bars 12a. 'And 19 "will be passed at least once.

  Therefore, for example, the rake teeth 18a of one rake 18-1 are inserted into the space 19 "between the screen bars 12a and the rake teeth 18a are inserted into the space 19 'between the remaining screen bars 12a. Since it is not inserted and is in a vacant state, it is possible to secure a water flow in this vacant space 19 ′, so that a plurality of rake teeth 18 a included in one rake 18 are provided between all the screen bars 12 at once. It is possible to prevent the water flow from being obstructed and the flow velocity from being lowered by being inserted into the space 19, thereby obtaining a stable rotational state of the water wheel 14. As described above, the rake teeth 18a included in one rake 18 are inserted only in some of the spaces 19 between the plurality of screen bars 12a. The contact resistance between the rake 18 at the time of scraping and the dust 102 floating on the screen 12 can be reduced as compared with the conventional one, so that the load on the water turbine 14 driving the rake 18 via the chain 16 is reduced. Therefore, it is possible to prevent the water turbine 14 from being stopped due to a load, as described above, any one of the rake teeth 18a included in all the rakes 18 when the chain 16 makes one turn makes each screen bar. The rake teeth 18a pass through each space 19 formed between the screen bars 12a at least once, that is, the rake teeth 18a surely enter all the spaces 19 between the screen bars 12a. Therefore, the scraping effect of the dust 102 stranded on the screen bar 12a is not lowered. In terms of obtaining a stable rotational state of the water wheel 14 can be prevented the stop, it can be maintained as in the conventional even scraping effect of dust as.

  And according to the hydraulic drive type dust removal system 10 concerning this Embodiment, the water wheel 14 is arrange | positioned in the upstream position of the screen 12, and in the upstream position of the screen 12, the influence of the fall of the flow velocity by the screen 12 being blocked. Since the time taken to receive is longer than that at the downstream position, when a large amount of dust is temporarily strayed to the screen 12 and the screen 12 is clogged, the predetermined time until the upstream flow velocity decreases. The rake 18 can remove part of the dust that has drifted to the screen 12. Accordingly, it is possible to prevent the rotation of the water turbine 14 from being stopped due to temporary drift of a large amount of dust onto the screen 12.

  Further, in the hydraulically driven dust removal system 10 according to the present embodiment, it is not necessary to install equipment such as the above-described auxiliary water turbine, so that it can be used in a limited space such as a water tank of a hydroelectric power plant. It is.

  In addition, this invention is not limited to the range of the said embodiment, A various change is possible within the range of the summary of invention. For example, in the present embodiment, the arrangement distribution of the rake teeth 18a of each rake 18 is not limited to that of the above-described embodiment, and the rakes 18-1 to 18-4 provided in the chain 16 include. As long as any of the rake teeth 18a passes through the spaces 19 formed between the screen bars 12 at least once, various forms can be adopted. Further, when the influence of the decrease in the flow rate due to the space 19 being blocked by the rake teeth 14 is small, the rake teeth 14 of one rake 18 may be provided corresponding to the spaces 19 between all the screen bars 12a. good.

It is a schematic side view of the waterway of the power plant in which the hydraulic drive type dust removal system concerning this Embodiment is installed. It is II schematic sectional drawing of a hydraulic drive type dust removal system.

10 Hydropower-driven dust removal system 12 Screen 14 Water wheel 16 Chain (circulating moving body)
18 rake 18a rake teeth

Claims (1)

A raised portion formed at the bottom of a water channel that flows into the hydroelectric power station,
The channel cross section of the water channel in a state inclined at a predetermined angle with respect to the vertical direction by one end being locked to the raised portion and the other end being locked to an edge of a shore formed on the downstream side of the raised portion. A screen that prevents the inflow of dust installed so as to block the whole area;
A water wheel disposed at an upstream position of the screen, pivotally supported at a height position similar to the edge of the shore, and driven by a water flow in the water channel;
The driving force from the water turbine is transmitted through a transmission belt having one end connected to the drive shaft of the water turbine and a shore side driving force transmission sprocket installed on the shore and connected to the other end of the transmission belt . The upper screen upstream trajectory along the screen moves from the lower side to the upper side, moves to the upstream side at the upper end portion, moves downward, and turns to the downstream side at the lower end portion, and again passes the screen upstream trajectory. A circular moving body that circularly moves so as to move; and
A rake having a plurality of rake teeth attached to the circulation moving body and attached so as to protrude toward the screen in a state where the circulation movement body is moving on the screen upstream track;
Have
The screen is configured in a comb shape by arranging a plurality of screen bars with a predetermined interval in the width direction of the water channel,
The rake teeth have a length that enters a middle position of a space formed between the screen bars when the circulating moving body is moving on the screen upstream track,
The transmission belt is linearly arranged from the shaft support portion of the water wheel toward the shore side driving force transmission sprocket ,
The hydraulically driven dust removal system , wherein the lowest point of the trajectory along which the circulating moving body moves is at a height position substantially the same as one end of the screen that is locked to the raised portion .

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