JP2657270B2 - Cleaning equipment for strainer in cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning a strainer in a cooling tower, and more particularly to a strainer mounted on a water collecting tank provided in the cooling tower in order to remove foreign substances such as dust mixed in cooling water. A cleaning device.

[0002]

2. Description of the Related Art Conventionally, as this kind of cooling tower, for example, there is an open-to-atmosphere type cooling tower.
Air containing gravel or the like may be sent from the blower into the cooling tower, or fragments of the filler in the cooling tower may fall, and these foreign substances may enter the cooling water.

[0003] Since such contaminants cause damage to pumps, refrigerators, and the like in the piping route, in order to protect these devices, conventionally, for example, as shown in FIG. At the lower part of 34, a water collecting tank 36 having a coarse strainer 35 of about 5 to 6 mesh is arranged, and a fine strainer 38 of about 20 mesh is separately arranged at a position before the pump 37 in the piping route. By doing so, the contaminants were removed.

Since the removed contaminants adhere to the strainers 35 and 38 after a certain period of operation, it is necessary to periodically clean the contaminants to remove the contaminants from the strainers 35 and 38.

[0005]

However, since the former strainer 35 is disposed below the surface of the water, when cleaning it, the operation of the cooling tower 33 is stopped and the cooling tower is stopped.
In addition to the need to drain the water inside 33, there is a drawback in that additional cleaning water is required, which increases the cleaning cost.
In addition, the cleaning operation performed in a bad environment such as the inside of the cooling tower 33 imposes a great burden on an operator.

On the other hand, the latter cleaning of the strainer 38 is performed by monitoring the pressure difference between the pipes before and after the strainer 38 and removing the strainer 38 from the pipe path as necessary. However, since the strainer 38 is large, it is large. In addition, there is a problem that the weight is very heavy, and a great deal of labor is required for detachment from the pipe, and the cleaning work is very difficult.

In this case as well, it is necessary to stop the operation of the cooling towers 33. Particularly, when a plurality of cooling towers 33 share a pipe, the operation of all the cooling towers 33 must be stopped. As a result, the decline in operating rates could not be avoided.

On the other hand, in order to reduce the number of times of cleaning the latter strainer 38, the strainer 35 of the water collecting tank 36 may be made fine with a mesh of about 20 mesh to remove most of the contaminants by the strainer 35. Although it is possible, frequent cleaning operations are required, and it is not necessarily the optimal means for solving the above problems.

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to easily and inexpensively perform a strainer cleaning operation.

[0010]

That is, in order to solve the above-mentioned problems, the present invention captures foreign matter mixed in the cooling water in a water collecting tank 3 arranged below the water receiving tank 2 of the cooling tower 1. A cleaning device for the strainer 6 provided in order to eject a fluid to the strainer 6, an injection device disposed below the strainer 6, and a suction device for suctioning foreign matter detached from the strainer 6. It is a washing device of a strainer in a cooling tower consisting of:

[0011]

Therefore, in the cleaning apparatus characterized by the above-mentioned structure, the cooling water treated in the cooling tower 1 is discharged to the outside through the water receiving tank 2 and the water collecting tank 3, while being cooled. The contaminated foreign matter is captured by the strainer 6 when passing through the strainer 6.

When the strainer 6 is to be washed, a fluid such as air or water is jetted toward the strainer 6 by the jetting means, so that the foreign matter adhering to the strainer 6 is released from the strainer 6 and the suction means. What is necessary is just to suck in the foreign matter which has left due to.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a strainer cleaning apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cooling tower in which a filler (not shown) and the like are provided, and a water receiving tank 2 is provided at the lower end thereof. Numeral 3 denotes a water collecting tank disposed at a lower portion of the water receiving tank 2, and an inlet 4 is formed at an upper end portion of the water collecting tank 2 as shown in FIG. Is provided.

In FIG. 1, reference numeral 6 denotes a strainer having a double structure composed of a pair of nets 6a and 6b disposed in a flow passage 6c of the water collecting tank 3. Each of the nets 6a and 6b It is attached at a predetermined interval so as to cover the entrance 4, and the upper mesh body
6a is a mesh formed about 20 mesh and the lower mesh
6b is formed in a mesh of about 5 mesh.

Numeral 7 is a pipe for fluid ejection arranged in a lattice shape below the strainer 6, and a plurality of nozzles 8 are connected to a predetermined position of the pipe 7 toward the strainer 6. . Reference numeral 9 denotes a pipe for collecting foreign matter, which is disposed in the water receiving tank 2 so as to surround the upper end of the water collecting tank 3, and a plurality of suction holes 9a. It becomes.

Reference numeral 10 denotes a blower capable of blowing air, which is connected to a pipe 7 in the water collecting tank 3 via a valve 11. Reference numeral 12 denotes a foreign matter recovery pump, which is connected to the pipe 9 via a valve 13. Numeral 14 denotes a container for collecting foreign matter provided in the cooling tower 1. The container for collecting foreign matter 14 is composed of two open-topped containers formed of meshes finer than the meshes 6a of the strainer 6 as shown in FIG. The cooling water, which has a double structure composed of 14a and 14b, and is sent together with foreign matter by the pump 12, is discharged into an inner container 14b through a pipe 17 having valves 15 and 16.

A pipe 18 for circulating cooling water has one end connected to the outlet 5 of the water collecting tank 3 and the other end connected to the upper side of the cooling tower 1. Reference numeral 19 denotes a water supply pump, reference numeral 20 denotes a cooler, and reference numerals 21, 22, and 23 denote valves, each of which is incorporated in a pipe 18. Reference numeral 24 denotes a strainer connected to the front side of the pump 19 to protect the pump 19, and reference numeral 25 denotes a pressure gauge for measuring a pressure difference between a pipe portion before and after the strainer 24.

The present embodiment has the above configuration.
After the cooling water cooled by the cooling tower 1 is collected in the water receiving tank 2, the cooling water passes through the strainer 24 from the water collecting tank 3 and passes through the pump 19.
After the water is sent to the refrigerator 20 and heated, the water enters a hot water state, returns to the cooling tower 1 via the pipe 18, and is again cooled by the cooling tower 1.

Since the strainer 6 is provided in the water collecting tank 3, when the cooling water passes through the strainer 6, foreign matter such as dust mixed in the cooling water is captured by the strainer 6. Thus, the cooling water is sent in a state where the foreign matter has been removed.

In this case, since the mesh of the upper net 6a of the strainer 6 is fine, most foreign substances are trapped by the net 6a, and the other net 6b is mainly composed of the upper net. It merely plays a supplementary role such as reinforcing the mesh body 6a.

When cleaning the strainer 6 to remove foreign matter adhering to the upper surface thereof, the blower 10 and the pump 12 are first operated.

By the operation of the blower 10, air is substantially uniformly injected from the nozzle 8 to the strainer 6 through the pipe 7, and foreign matter adhering to the upper surface of the mesh body 6 a on the upper side of the strainer 6 is removed. It will float inside the water receiving tank 2.

However, the foreign matter is sucked together with the cooling water by the operation of the pump 12 into the suction holes 9a... Provided in the pipe 9 and collected by the foreign matter collecting containers 14a and 14b through the pipe 17, and only the cooling water is removed. It is returned into the cooling tower 1. still,
The foreign matter collected in the foreign matter collection containers 14a and 14b is removed periodically by removing the foreign matter collection container 14b.

In this manner, the cleaning operation of the strainer 6 can be performed extremely easily and in a short time without putting a burden on the operator.

Further, since such a series of cleaning operations can be performed even during the operation of the cooling tower 1, the cleaning operation is performed without using cooling water without disturbing the cooling operation. Therefore, there is an advantage that the washing can be performed at a low cost without increasing the washing cost without using additional water.

On the other hand, since the strainer 24 is also provided in the pipe 18, the foreign matter is removed twice in combination with the strainer 6, but as described above, most of the foreign matter is captured by the strainer 6. There is also an advantage that since the foreign matter is removed, the amount of foreign substances captured by the strainer 24 is very small, and thus the frequency of cleaning the strainer 24 is greatly reduced.

Since the foreign matter is suitably removed by the two types of strainers 6, 24 in this manner, the pump
19 and the cooler 20 without damage.
The water heated in the above is circulated and sent to the cooling tower 1.

Further, since such a washing operation is performed mechanically by the water feeder 10 and the pump 12, there is an advantage that a series of washing operations can be automated by linking the two.

The meshes 6a and 6b of the strainer 6 according to the above embodiment are formed in a flat shape, but the specific shape is not limited. For example, foreign matter such as gravel that is hard to float is cooled. In the case where a large amount is mixed in water, for example, the meshes 6a and 6b of the strainer 6 are formed in a substantially inverted V shape as shown in FIG. 4 (a), or a substantially hemispherical surface as shown in FIG. 4 (b). The nets 6a and 6b may be formed in a substantially V-shape as shown in FIG. 3C, and a receiving member 26 having a substantially U-shaped cross section may be provided at the center of the net-shaped bodies 6a and 6b. The member 26 can also collect foreign matter having a specific gravity.

In this case, a pipe 27 having a suction hole 27a at a lower position in the receiving member 26 may be provided, and foreign matter may be sucked and discharged by the pump 12 through the pipe 27. In the case of the former two, as shown in FIG. 5, a weir 28 having a substantially U-shaped cross section is disposed around the water collecting tank 3 at a position below the pipe 9, and a suction hole 9 a of the pipe 9 is provided. Is provided at the lower position, not only the foreign matter settling on the weir 28 but also the foreign matter floating in the water receiving tank 2 can be satisfactorily sucked and discharged.

Further, in order to prevent foreign matters floating in the water receiving tank 2 from diffusing into the surroundings, a cylindrical annular shape as shown in FIG. 6A or a rectangular shape as shown in FIG. What is necessary is just to arrange | position the diffusion prevention panels 29 and 30 formed in the shape etc.

Further, in this embodiment, the foreign matter is sucked by the pipe 9 disposed around the water collecting tank 3, but the present invention is not limited to this, and has a suction port 31a as shown in FIG. It is also possible to connect a plurality of suction members 31 to the pump 12 via a pipe 32 so as to be configured.

Further, the strainer 6 provided in the water collecting tank 3 does not necessarily have to have a double structure as in the above embodiment.

In this embodiment, air is blown to the strainer 6 using the blower 10, but water may be blown using a pump or the like. May be jetted, and the specific fluid to be jetted and jetting means are not limited.

[0036]

As described above, according to the present invention, foreign matter such as dust caught by the strainer is released from the strainer by injecting a fluid by the ejecting means, and is sucked by the sucking means. Since the cleaning is performed, the following various effects are obtained.

That is, since it is not necessary for an operator to enter the cooling tower to wash the strainer as in the conventional case, the burden on the operator can be greatly reduced, and the washing operation can be performed simply and quickly. Become.

Further, since almost all foreign substances such as dust can be removed by the strainer of the water collecting tank, it is not necessary to remove the strainer provided in the piping route and frequently clean the pipe.

Therefore, the number of times of stopping the operation of the cooling tower for removing the strainer as in the related art is reduced, and the reduction in the operation rate can be minimized. This is particularly effective when a plurality of cooling towers share a pipe.

Further, since the cleaning is carried out by using the cooling water itself, it is not necessary to stop the cooling tower and perform the cleaning as in the conventional case. Therefore, the cost for cleaning can be reduced.

Further, since the cleaning apparatus according to the present invention has an extremely simple structure as described above, there is also a practical effect that its manufacture can be performed easily and at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a piping state according to an embodiment of the present invention.

FIG. 2 shows a water collecting tank as one embodiment, (a) is a plan view, and (b) is a partial cross-sectional front view.

FIG. 3 is a schematic front view showing a foreign matter collection container.

FIGS. 4A to 4C are front views of a strainer showing another embodiment.

FIG. 5 is a schematic front view showing another embodiment.

6 (a) and 6 (b) are schematic front views showing another embodiment.

FIG. 7 is a schematic front view showing another embodiment.

FIG. 8 is an explanatory diagram showing a piping state of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cooling tower 2 ... Water receiving tank 3 ... Water collecting tank 6 ... Strainer 6a, 6b ... Net-like body 6c ... Flow passage 8 ... Nozzle 10 ... Blower 28 ... Weir

Claims (4)

(57) [Claims] 1. A cleaning device for a strainer 6 provided in a water collecting tank 3 disposed below a water receiving tank 2 of a cooling tower 1 to capture foreign matter mixed in cooling water. A cooling device comprising: an injection means provided at a position below the strainer 6 for jetting; and a suction means provided at a position near the strainer 6 to suck foreign matter detached from the strainer 6. Washer for strainer in tower. 2. An air blower comprising:
2. A strainer cleaning apparatus in a cooling tower according to claim 1, further comprising a nozzle connected to a pipe and capable of ejecting air. 3. The strainer 6 comprises a pair of upper and lower nets 6a and 6b disposed in a cooling water flow passage 6c in the water collecting tank 3, and the upper net 6a is connected to the lower net 6b. 3. The apparatus for cleaning a strainer in a cooling tower according to claim 1, wherein the mesh is formed smaller than the mesh. 4. A weir having a substantially U-shaped cross section around the water collecting tank 3.
2. The apparatus for cleaning a strainer in a cooling tower according to claim 1, wherein a cooling device is provided in said weir, and said suction means is provided in said weir.