JP2551394Y2 - Blowdown device for cooling tower - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a blowdown device for a cooling tower.

[0002]

2. Description of the Related Art In a cooling water system in which cooling water is used once in a refrigerator and various industrial equipment, and is heated, and is cooled again using a cooling tower, the cooling water is used in accordance with the heat exchange function of the cooling tower. Because the remaining cooling water is cooled using some latent heat of vaporization, calcium ions in the cooling water,
Magnesium ions and the like are concentrated and scale is easily deposited, and the quality of the cooling water is changed and deteriorated by sulfurous acid gas or the like in an air polluted area, which may cause a failure or breakage of a refrigerator or the like.

[0003] In order to suppress such precipitation of scale and changes in water quality and to maintain the quality of cooling water at a constant level, Japanese Utility Model Application Publication No.
In the blowdown device described in JP-A-6-36992, a blowdown device is provided in an upper water tank of a cooling tower, and an opening area adjuster for adjusting a blowdown amount of the blowdown device is provided.

[0004]

In the above-mentioned prior art, the bottom of the upper water tank is perforated, a blowdown device main body is incorporated, or a vertical drain pipe is connected to the side wall of the upper water tank. Since a blowdown device is installed by attaching a valve to a part of the pipe, equipment for the blowdown device must be added to the ordinary cooling tower, which increases the equipment cost and the amount of water per unit time for blowdown But very few.

This invention is to develop a cooling water blow-down device having a simple structure, solve the above-mentioned drawbacks of the prior art, and operate an opening / closing valve provided in a pipe section communicating with a cooling tower outside a circulation path. No, it is possible to obtain a sufficient amount of blowdown during operation according to the water level of the lower water tank in the cooling tower, improve the quality of cooling water, avoid precipitation of scale, and at the time of starting operation of the cooling tower. It is an object of the present invention to provide a blowdown device for a cooling tower, which disables the original blowdown function until a water level of a lower water tank reaches a predetermined water level during a water supply operation, and enables a desired water supply operation. .

[0006]

In order to solve the above-mentioned problems, a blow-down device for a cooling tower of the present invention, in which a part of the circulating cooling water is guided to the outside of the circulation path of the circulating cooling water, is provided. At the bottom of the water tank, a tubular body is disposed almost vertically, and the bottom of the tubular body is connected to a pipe portion communicating with the outside of the circulation path of the cooling tower. It has a shape to receive a part of water, and a floating ball floating according to the water level of the circulating cooling water in the cylinder , the lower water stop port on the pipe portion communicating with the bottom of the cylinder via a string When the floating ball is at the lower position near the bottom of the cylindrical body, the floating ball is closed by its own weight. The on-off valve that allows the part to flow in from the bottom of the cylinder Wherein the is provided in the vicinity. The on-off valve is urged by a spring to always open,
It is desirable that the spring be closed by the weight of the floating ball.

[0007]

The operation of the present invention constructed as described above will now be described. During the water supply operation at the start of the operation of the cooling tower, the circulating cooling water is sequentially supplied to the lower water tank of the cooling tower. At the start of the supply, the inside of the cylinder is empty and the floating ball
Is located at a lowered position near the bottom of the cylindrical body, the water level in the lower water tank is lower than the upper end edge of the cylindrical body at a water level L1, and the on-off valve provided near the bottom of the cylindrical body by the weight of the floating ball is It is in a closed state (see FIG. 1). Subsequently, the level of the supplied circulating cooling water gradually increases, and the level of the circulating cooling water exceeds the total height of the cylindrical body. A part of the circulating water flows in from the upper opening of the cylindrical body to fill the cylindrical body. Gives buoyancy to floating balls. As a result, the floating ball starts to rise, and as the floating ball rises, the on-off valve, which has been closed by the weight of the floating ball until now, opens due to water pressure and / or the urging force of a spring (FIGS. 4 and 4). 5). Due to the opening of the on-off valve, a part of the circulating cooling water flows from the bottom of the cylindrical body.
The floating ball rises further by receiving buoyancy. By this raising, the plug is pulled up via a string to the floating ball, and the upper water stop, the lower water stop, and the upper water stop are closed with the plug, on the pipe portion communicating with the bottom of the cylindrical body. To prevent part of the circulating water from escaping to the outside of the circulation system during the water supply work (see FIG. 2). In this state, the circulating water is continuously supplied to the predetermined water level in the lower water tank at the start of the operation of the cooling tower.

[0008] Then, while continuously performed the cooling tower operation, circulating a portion of the cooling water or Kiyariioba outside the cooling tower, the lower water tank disturbed to the supply of the circulating cooling water is generated by the variation of the load portion The water level in the inside falls, and the floating ball starts to descend, and as the floating ball descends, the plug also descends, separates from the upper water shutoff port, and the upper and lower water shutoff ports are opened. As a result, a part of the circulating water flowing into the cylinder from the opened on-off valve is discharged to the outside of the circulation path through the pipe section, and the blow-down operation is automatically performed (see FIG. 3).

[0009] When the plug continues to descend as the water level decreases and reaches the lower water stop of the pipe section, the plug closes the lower water stop, and thereafter, a part of the circulating water is supplied to the pipe section. Through the circulation system. In this state, fresh water or circulating water is replenished in the lower water tank.

In the invention described in claim 2, in addition to the above-mentioned operation, the on-off valve is always urged to open by a spring, and the spring is closed by the weight of the floating ball. Thus, the opening and closing of the on-off valve is forcibly and automatically performed in the lower water tank (see FIGS. 1 to 4).

[0011]

Next, a description will be given of a typical embodiment of the invention described in the first and second aspects. Embodiment 1 In FIG. 1, A indicates the entire blow-down device for a cooling tower B of a type in which a part of the circulating cooling water is guided to the outside of a circulation system path F of the circulating cooling water.

At the bottom of the lower water tank 10 in the cooling tower B, a cylindrical body 20 is disposed almost vertically, and a bottom 21 of the cylindrical body 20 is connected to a pipe section 22 communicating with the outside of the circulation system F of the cooling tower B. The upper part 23 of the cylindrical body 20 is open and has a shape to receive a part of the circulating cooling water.

In this cylindrical body 20, floating balls 24 floating in accordance with the level of the circulating cooling water are provided above and below the pipe portion 22 communicating with the bottom of the cylindrical body 20 through a cord 30. 2
5, 26 are connected to a plug 27 for selectively opening and closing,
The floating ball 24 is closed by its own weight at a lowered position near the bottom 21 of the cylindrical body 20, and opens as the floating ball 24 rises, and a part of the circulating cooling water flows in from the bottom of the cylindrical body 20. The on-off valve 28 that enables the
Is provided in the vicinity of the bottom 21. The upper and lower water stop 25,
Numeral 26 protrudes inward from the inner wall of the pipe portion 22 in a ring shape.
A hole is provided in the center of the flange piece, and
A shape in which the peripheral surface of the plug body 27 is in close contact with the peripheral edges of 5, 26
(See FIG. 2).

The opening / closing valve 28 is always urged in a direction to be opened by a spring 29, and the spring 29 is closed by its own weight. The operation of the first embodiment is the same as the operation of the present invention described in the first and second aspects, and thus the description thereof is omitted.

Embodiment 2 FIG. 5 is different from Embodiment 1 in that the on-off valve 28 is not forcibly urged in the opening direction by a spring 29 shown in Embodiment 1, and The floating ball 2 is provided at one end thereof near the bottom 21 so as to be freely opened and closed by a hinge means or the like.
With the buoyancy of 4, the circulating water is opened by the external pressure. In addition, the same reference numerals as those in the first embodiment denote the same components, and the operations are the same.

[0016]

Advantages of the Invention The advantages of the invention, which is constructed and operates as described above, are as follows. In the device described in claim 1, a floating ball that floats in accordance with the level of the circulating cooling water is provided in the cylindrical body with upper and lower water shutoff ports of the pipe portion communicating with the bottom of the cylindrical body via a string. The floating ball is connected to a plug that selectively opens and closes, and the floating ball is closed by its own weight at a lowered position near the bottom of the cylindrical body, and opens as the floating ball rises, and a part of the circulating cooling water is released. Since an on-off valve for allowing the inflow from the bottom of the cylinder is provided near the bottom of the cylinder, the water level of the cylinder exceeds the total height, and a part of the circulating water flows from the upper opening of the cylinder. Fills this cylindrical body and gives buoyancy to the floating ball, so that the floating ball starts to rise, and with the rise of the floating ball, the on-off valve, which has been closed by the weight of the floating ball, opened by such pressure, one circulating cooling water by opening and closing of the closing valve When the floating ball flows from the bottom of the cylindrical body, the floating ball further rises by receiving buoyancy rapidly upward, and a pulling body is pulled up through the floating ball through a string, and the pipe communicates with the bottom of the cylindrical body. Of the upper and lower water stop of the part, close the upper water stop with this plug,
An effect of preventing a part of the circulating water from escaping during the water supply operation to the outside of the circulation system through the pipe portion can be obtained. As a result , the circulating water can be continuously supplied to the predetermined water level in the lower water tank at the start of the cooling tower operation.

Furthermore, while continuously performed the cooling tower operation, part of the circulating cooling water or Kiyariioba outside the cooling tower, the lower water tank disturbed to the supply of the circulating cooling water by the variation of the load portion is generated The water level in the inside falls, the floating ball starts to descend, the floating body descends, the plug also descends, separates from the upper water stop, and the upper and lower water shuts open, and the open and closed A part of the circulating water flowing into the cylinder from the valve can be discharged to the outside of the circulation system through the pipe portion, and the blow-down operation can be automatically performed.

When the plug continues to descend and reaches the lower water stop of the pipe section, the plug closes the lower water stop, and after that, a part of the circulating water passes through the pipe to the circulation system. Prevent it from being discharged outside. In this state, fresh water or circulating water can be replenished in the lower water tank at any time.

Next, in the device according to the second aspect, in addition to the effect of the device according to the first aspect, the on-off valve is constantly urged to open by a spring, and the spring is closed by its own weight. Therefore, the on-off valve can be forcibly and automatically opened and closed in the lower water tank.

[Brief description of the drawings]

FIG. 1 is a schematic view of a first embodiment showing a state in which a water level has not reached an upper opening of a cylindrical body.

FIG. 2 is a schematic front view similar to FIG. 1 showing a state in which a water level reaches an upper opening of a cylindrical body and an opening of an on-off valve is started.

FIG. 3 is a schematic front view similar to FIG. 1, showing a blowdown operation state.

FIG. 4 is a schematic diagram showing a state in which the water level has exceeded the entire height of the cylindrical body and has reached a sufficient height.

FIG. 5 is a schematic front view of a second embodiment showing an opening start state of an on-off valve that is not biased by a spring;

[Explanation of symbols]

 A cross-flow cooling tower 20 cylinder

Claims (2)

(57) [Scope of request for utility model registration] 1. A blow-down device for a cooling tower of a type in which a part of circulating cooling water is guided to the outside of a circulating system of a circulating cooling water, wherein a cylindrical body is disposed almost vertically at the bottom of a lower water tank. The bottom of the body is connected to a pipe portion communicating with the outside of the circulation path of the cooling tower, and the top of the cylinder is open to receive a part of the circulating cooling water. A floating ball that floats according to the water level of the water is connected to a plug that selectively opens and closes a lower water stop port on the pipe portion that communicates with the bottom of the cylindrical body via a string, Is closed by the weight of the floating ball when it is in the lowered position near the bottom of the cylindrical body, and opens and closes as the floating ball rises to allow a part of the circulating cooling water to flow from the bottom of the cylindrical body. Is provided in the vicinity of the bottom of the cylindrical body. Apparatus. 2. The valve according to claim 1, wherein the on-off valve is constantly biased by a spring in a direction in which it is opened, and is closed by the weight of the floating ball against the biasing force of the spring.
2. A blow-down device for a cooling tower according to claim 1.