JP2550115B2 - Rotary strainer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dust removal strainer, and in particular, solid foreign matter in cooling water for heat exchangers such as condensers using river sea water as cooling water in thermal power plants, nuclear power plants, etc. The present invention relates to a dust removing strainer suitable for removing dust.

[Conventional technology]

As a strainer of this type, Japanese Patent Laid-Open No. 59-15715 is known. As a modification for practical use of this type of strainer, Paproget "Optimization of Cooling Water Circuit" No.84
10-15-410-02, page 6 (Optimization of Cooling Wa
ter Circuits), a plurality of cylindrical strainer baskets are fixedly installed, and corresponding to the number of them, radially adjacent partition passages having a fan-shaped cross section are provided. A fan-shaped valve for shutting off water into the passage, a foreign matter discharge pipe is provided in the partition passage between the valve and the basket, and the fan-shaped valve and the foreign matter discharge pipe are The number of partition passages was set up. Therefore, the same number of fan-shaped valves as the number of baskets and the same number of fan-shaped valve drive devices as the number of baskets are provided outside the device. That is, for example, in the case of a device with four baskets,
Four drive devices for the fan-shaped valve were installed, and four foreign matter discharge pipes (two in the case of installing a common foreign matter discharge pipe across two partition passages) were piped. .

The operation is performed by closing the fan-shaped valve in any partition passage at the upstream end and opening the foreign matter discharge pipe to cause a backwash flow in the basket corresponding to that partition passage to clean and discharge only that compartment. However, the other compartments were designed to remove dust from the main water as usual.

As another conventional example, in Japanese Utility Model Application No. 59-163717, one frustoconical strainer basket is fixedly installed, the inside is divided into four, and a fan-shaped partition plate is provided adjacent to the upstream end of the partition. The plate is rotatable about the axis of the basket, and the foreign matter discharge pipe and the foreign matter discharge valve are individually provided in four sections at the downstream end of the basket, and one section of the basket closed by a partition plate is the section. By opening the foreign matter discharge valve connected to, the backwash flow was generated and the foreign matter was discharged.

[Problems to be solved by the invention]

In the former case of the above-mentioned prior art (Taproge company pan frets), if the number of partitions in the strainer section is increased, the passage sectional area for one partition chamber becomes smaller, so that the fan valve and the foreign matter discharge pipe diameter can be made smaller. Therefore, the length of the device can be shortened, and there are advantages such as the loss of water resistance and the amount of foreign matter discharged water due to the partial passage closure during the backwash operation. The number of foreign matter discharge pipes and the number of foreign matter discharge pipes increase, the structure of the device itself becomes complicated, the manufacturing cost increases, and the space required for the external fan valve drive device and foreign matter discharge pipes increases. However, there was a problem that it was difficult to increase the number of partitions.

In the latter of the above-mentioned technologies (Japanese Patent Application No. 59-163717),
Although there is only one fan-shaped partition plate and its driving device, only one section of the basket is closed at any one time.
Since only the cross-sectional area of% has a dust removing effect on water flow, the water flow resistance loss is larger than that of the former case (Taproge Co.), or it is necessary to reduce the loss due to the enlargement of the device, and foreign matter discharge The pipe and its stop valve required four systems. Further, if the number of partitions of the strainer section is increased, the fan-shaped partition plate, its drive unit, and the diameter of the foreign matter discharge pipe can be reduced, and advantages such as reduction of water resistance loss and foreign matter discharge water amount can be achieved. On the other hand, on the other hand, since the number of foreign matter discharge pipes increases to cover the water flow, the water flow resistance loss downstream of the basket increases, and the external surrounding space also increases.
Furthermore, if the diameter of the foreign matter discharge pipe is increased to increase the backwash effect, the diameter of the bottom of the basket at the foreign matter extraction portion at the downstream end of the basket increases, and the area of the water passage is reduced, and it is piped downstream of the bucket. There were problems such as an increase in resistance loss of the internal foreign matter discharge pipe to the main water flow.

An object of the present invention is to improve the installation conditions by downsizing the device itself and the surrounding space, reducing the size of the device itself, simplifying the structure, reducing the number of accessories, and reducing the manufacturing cost. (EN) It is possible to provide a strainer capable of reducing the resistance loss of the main water flow during the backwash operation and improving the influence on the system by reducing the amount of foreign matter discharged water.

[Means for solving problems]

The above object is to make a strainer basket rotatable about its axis with the water flow in the same direction, and to radially divide the inside of the basket about the axis to form a partition chamber having a plurality of fan-shaped cross sections. Only one partition passage having a fan-shaped cross section corresponding to one chamber is provided adjacent to the upstream side of the basket, and a water blocking means such as a valve for blocking water into the passage is provided at the upstream end of the partition passage. This is achieved by providing a foreign matter discharge pipe that communicates from the inside to the outside and providing a stop valve on the pipe.

[Action]

When a valve is provided as a means for shutting off the water, the valve in the partition passage at the upstream end is opened and the stop valve for the foreign matter discharge pipe is closed during normal water passage in the strainer configured as described above. As a result, the running water passes through the strainer over the entire cross section of the barrel, and the foreign matter in the running water is collected by the strainer basket, so that the dust removing operation can be performed.

When backwashing, by rotating the strainer basket with a drive device, the partition chamber in the basket and the upstream partition passage are aligned, the valve in the partition passage is closed, and the stop valve for the foreign matter discharge pipe is closed. When opened, the partition chamber of the basket communicating with the partition passage is blocked from running water from the upstream side, and only the partition chamber is subjected to backwash flow on the basket surface, and foreign matter is discharged from the foreign matter discharge pipe.

Therefore, the backwash is performed only by one partition passage, and is achieved by making one partition chamber of the basket to be backwashed coincide with the position of the partition passage by the rotating operation. The partition passage and its valve, the foreign matter discharge pipe, and its associated stop valve need only be provided in one set (one each) for one strainer device.

In addition, when the upstream end of the partition passage is covered with a plate-like member as a means for shutting off the water, the valve operation is not required among the above usage methods, and the operation and configuration are simplified.

〔Example〕

FIG. 1 is a vertical sectional view showing an embodiment of the rotary strainer of the present invention, and FIG. 2 is a II-II sectional view thereof.

The barrel 1 is directly connected to the water passage pipe and has a diameter equal to or larger than that of the pipe. A truncated cone-shaped basket 2 is rotatably installed therein. The basket is radially partitioned by a partition plate 3 when viewed from the direction of flowing water, has a shaft 4 at its center, and is rotatable by a basket drive device 6 via a gear box 5. Further axis 4
Is supported by a support 7 for stable rotation. The number of partition plates 3 of the basket is six in the example of FIG. 2, and accordingly, there are six partition chambers 8 having a fan-shaped cross section, and the illustrated angle θ ₁ is
It will be 60 degrees.

One partition passage 9a having the same cross section as the partition chamber 8 is provided adjacent to the upstream side of the basket 2. 9b is a passage wall. At its upstream end, a valve 10 that shuts off water into the partition passage
Is provided so that the valve drive device 11 can be opened and closed.

A foreign matter discharge pipe 12 communicating with the outside from the partition passage 9a is provided between the valve 10 and the basket 2, and the discharge pipe 12 is provided with a stop valve 13.

Normally, open the valve 10 during water flow, and stop the foreign matter discharge pipe 12
By closing, the running water passes over the entire cross section of the barrel 1 and over the entire area of the basket 2, and foreign matter in the running water is collected by the basket 2 to remove dust from the running water. Therefore, foreign matter adheres to the entire inner surface (upstream surface) of the basket 2. The basket 2 is formed in the shape of a net, a perforated plate, a lattice plate, a lattice, or the like. The stop position of the basket 2 does not sometimes cause a problem during normal water flow.

 The above-mentioned backwash state will be described with reference to FIG.

When backwashing, the basket 2 is driven by the basket drive device 6
By rotating the valve, the partition chamber 8 of the basket is aligned with the partition passage 9a, and the valve 10 is closed by the valve drive device 11.
Opening the stop valve 13 of the foreign matter discharge pipe 12 leads to the partition passage 9a. Since only the partition chamber 8 is blocked from running water from the upstream side, a backwash flow occurs from the outer surface to the inner surface in the basket of this partition chamber, and the foreign matter floats up from the basket surface and is discharged from the foreign matter discharge pipe 12.

In order to make the foreign matter discharge action effective, the connection destination of the foreign matter discharge pipe needs to be at a place having a pressure lower than the pressure during the backwashing operation of the partition chamber 8, which is discharged to the atmosphere or released. A circuit is formed at a position downstream of the heat exchanger of the apparatus so as to bypass the heat exchanger by utilizing the differential pressure of the heat exchanger.

 The effects of this embodiment are as follows.

The partition passage 9a, the valve 10, the valve drive device 11, the foreign substance discharge pipe 12 and the stop valve 13 required six sets in the conventional example, but in this embodiment, one set is always provided regardless of the number of the partition chambers 8 of the basket. A sufficient number of pairs is sufficient, and the effect of reducing the manufacturing cost and reducing the surrounding space is remarkable by reducing the number of valve drive devices 11 and foreign matter discharge pipes 12. If the number of partition chambers 8 is further increased, the valve 10 can be downsized, the valve drive device 11 can be downsized, and the foreign matter discharge pipe 12 and its stop valve 13 can also be downsized, whereby the length of the barrel 1 can be reduced. Can be shortened, which leads to reduction of manufacturing cost and installation space. Further, the amount of water discharged during backwashing can be reduced, and the resistance loss to the system due to the closing of the valve 10 during backwashing can also be reduced. On the other hand, the only factor that increases with the increase in the number of partition plates 8 is the number of partition plates 3, and the effect on the increase in the capacity of the basket drive device 6 is very small. This is because the basket 2 itself needs internal reinforcement at appropriate intervals, and the partition plate 3 has this reinforcing effect. Therefore, when the number of partition plates 3 increases, the plate thickness of the perforated plate of the basket 2 can be reduced. Therefore, the increase in the weight of the basket 2 as a whole is not significantly affected.

4 to 8 are schematic schematic diagrams showing five types of embodiments in which the shapes of the strainer baskets are different from each other. In these drawings, for the sake of simplicity of description and illustration, similar members are denoted by the same reference numerals.

FIG. 4 shows an example in which only one flat perforated plate is used as the strainer basket. In this case, the body 1 needs to be larger than the pipe diameter in order to secure the strainer area, but the length of the body 1 can be made short.

FIG. 5 shows an embodiment using a conical basket, and FIG. 6 shows an embodiment using a cylindrical diameter basket.

FIG. 7 shows an embodiment using a conical basket, in which the basket 2, the valve 10, the foreign matter discharge pipe 12, and the gear box 5 can be arranged by effectively utilizing the space, so that the length of the body 1 is shorter than that of the basket 2. Can be made extremely short. Therefore, it is advantageous to reduce the manufacturing cost and the installation space.

FIG. 8 shows an example in which frustoconical baskets are concentrically combined in order to secure a large strainer area, and the length of the body 1 is shortened compared with the strainer area. Also in this case, by making the upstream end surface shape of the basket 2 tapered, it is possible to effectively use the internal space and shorten the body.

As a characteristic configuration common to each of the above-described embodiments, the basket has a shape of a rotary body centered on an axis (for example, 4 in FIG. 1) parallel to the water flow direction (horizontal in the drawing).

FIG. 9 is a sectional view showing the internal structure of the gear box 5 shown in FIG. The shaft 4 receives power transmission by the bevel gear 16, but exposure to water flow, especially seawater is likely to cause functional damage due to adhesion of organisms, etc. Therefore, the shaft is sealed with a gear box 5 and a penetrating portion of the shaft 4 is provided. Water is sealed, and drainers 15 and 15 'are provided to prevent the leaked water from coming into contact with the gear section even if it leaks from the outside, and a drain drain 14 is provided on the bottom of the gear box 5 so that the leaked water does not collect. It is provided so that it can be discharged to the outside of the body 1.

FIG. 10 and FIG. 11 show an embodiment different from the above, and the difference from the embodiment shown in FIGS. 1 to 3 is that the number of partition plates 3 is increased and the number of partition chambers 8 is eight. And (the angle θ ₂ shown is 360 degrees /
8 = 45 degrees), without installing the valve 10 and closing the partition passage 9a at the upstream end to form the backwash chamber 17, in which case 1/8 is not always passed, so Correspondingly, the body 1 is made larger than the pipe diameter to secure the water passage area, reduce the resistance loss, and reduce the influence on the system. In this example, as the number of partitions is increased, the influence on the system is alleviated, and since the backwash chamber 17 is in a fixed position, the center of the pipe is opposite to the backwash chamber 17 with respect to the body 1 (upper in the figure). By making it eccentric, the water flow can be made somewhat smoother, so that the resistance loss is alleviated. According to the present embodiment, by eliminating the valve 10 and the valve Kudo device 11, there are effects such as reduction of manufacturing cost, reduction of installation space, and simplification of operation.

〔The invention's effect〕

According to the present invention, the number of drive valves and foreign matter discharge pipes can be reduced, and only one set is required. Therefore, the production cost can be significantly reduced and the installation space can be improved by reducing the surrounding space. In implementing the present invention, if the number of partitions in the basket is increased, the drive valve and the foreign matter discharge pipe are downsized, resulting in downsizing of the device, manufacturing cost reduction effect, and systematic loss during backwashing. The reduction has the effect of improving the system operating state.

When the present invention is carried out, for example, when a six-partitioned partition is adopted, the number of valves 10, their drive unit 11, foreign matter discharge pipes 12 and stop valves 13 is 6 in the conventional example, but 1 in the present invention.
Only a set is required, which does not reduce the backwash effect.

When the number of divisions is increased, the cross-sectional area of the partition passage 9a is reduced in inverse proportion, so that the valve 10 and its drive unit 11, the foreign matter discharge pipe 12
Also, the stop valve 13 becomes smaller, the strainer device itself can be made smaller, and the closed area at the time of backwashing becomes smaller, so that the resistance loss of water flow becomes smaller and the surface area for one partition chamber 8 of the basket becomes smaller. .

[Brief description of drawings]

FIG. 1 is a vertical longitudinal sectional view of an embodiment of a rotary strainer according to the present invention, FIG. 2 is a II-II sectional view thereof, and FIG. 3 is an explanatory view of the operation of the above embodiment. 4 to 8 are schematic schematic views showing embodiments different from the above, in which members similar to each other are designated by the same reference numerals. FIG. 9 is a sectional view of the gear box. FIG. 10 is a vertical longitudinal sectional view of still another embodiment. 11th
The figure shows a vertical cross section thereof and corresponds to FIG. 2 in the above-mentioned embodiment. 1 ... basket, 3 ... partition plate, 4 ... axis, 6 ... basket drive device, 8 ... partition chamber, 9a ... partition passage, 10
…… Valve, 11 …… Valve drive, 12 …… Foreign matter discharge pipe, 13 ……
Stop valve, 17 …… Backwash room.

Claims (3)

(57) [Claims] 1. A dust removing strainer installed in the middle of a pipe for river water, comprising: (a) a hollow strainer basket in the form of a rotating body; (b) aligning the central axes of the baskets in the water flow direction; (C) The inner space of the basket is partitioned by a plurality of partition plates provided along a plane passing through the central axis, and is rotatably supported about the central axis. A partition chamber is formed, (d) one partition passage having a fan-shaped cross section corresponding to the fan-shaped cross section is installed on the upstream side of one of the plurality of partition chambers, and (e) A means for preventing river seawater from flowing into the partition passage is provided at the upstream end of the one partition passage, (f) a foreign matter discharge pipe is fixedly connected in the middle of the partition passage, and (g) the above A rotary strike characterized by a stop valve provided on the foreign matter discharge pipe. Lena. 2. The rotary strainer according to claim 1, wherein the means for blocking the inflow of river water is a valve that can be opened and closed. 3. The rotary strainer according to claim 1, wherein the means for preventing the inflow of river water is a plate-like member which is fixed by covering the upstream end of the partition passage. .