JP2001340702A - Defoaming device and chemical feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized defoaming device which has a simple structure and can easily be installed even in a place having a narrow space. SOLUTION: This defoaming device is provided with a vertically long defoaming cylinder 11 in which an introduction port 17 for a liquid to be treated, a discharge port 18 for a treated liquid and a gas discharge port 19 are placed, wherein: the inside of the defoaming cylinder 11 is divided into a first chamber 14 and a second chamber 15 by a partition wall 13 erected on the bottom of the defoaming cylinder 11 so as to extend from the bottom up to a certain height; also, a communication space 16 for communicating the upper parts of both the first and second chambers 14 and 15 with each other, is formed in the defoaming cylinder 11; and the to-be-treated liquid introduction port 17, treated liquid discharge port 18 and gas discharge port 19 are placed in the first chamber 14, second chamber 15 and communication space 16 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming device and a chemical injection device using the defoaming device.

[0002]

2. Description of the Related Art When a chemical solution in a chemical solution tank is supplied to a required portion by a chemical injection pump, if the chemical solution contains sodium hypochlorite, hydrazine hydrogen peroxide, or the like, the chemical solution is supplied from the chemical solution tank to the chemical injection pump. In the middle of the piping, the chemical solution is partially decomposed to generate bubbles. When the air bubbles enter the chemical injection pump, the air bubbles repeatedly expand and contract inside the pump, causing a gas lock phenomenon, and the chemical injection pump does not discharge the chemical liquid.
For this reason, a pipe that is higher than the chemical liquid tank is set up at the pipe at the inlet of the chemical dosing pump, and air bubbles are discharged to the outside from the upper end of the set up pipe to be separated.

[0003]

In the case of a chemical injection device, the outlet of the chemical liquid tank and the suction port of the chemical injection pump are often connected by a hose. Therefore, it is difficult to set up a pipe for releasing air bubbles from the hose.

[0004]

According to a first aspect of the present invention, a simple and compact structure is provided even if a discharge port of a chemical tank and a suction port of a chemical injection pump are connected by a hose. A defoaming apparatus, wherein a vertically long defoaming cylinder is provided with a liquid to be treated, a treatment liquid outlet, and an exhaust port, and the inside of the defoaming cylinder is provided. A first chamber and a second chamber are defined by a partition plate standing from the bottom, and a communication space that communicates the upper portions of the first and second chambers is formed;
The first chamber is provided with a treatment liquid inlet, the second chamber is provided with a treatment liquid discharge port, and the communication space is provided with an exhaust port.
In addition, it is preferable to provide a hose mounting means at each of the inlet for the liquid to be treated, the outlet for the processing liquid, and the outlet.
In addition, the chemical injection device according to claim 3 of the present invention includes a chemical liquid tank for storing a chemical liquid, a chemical injection pump for supplying the chemical liquid in the chemical liquid tank to the outside by a discharge pipe, and a chemical liquid from the chemical liquid tank to the chemical injection pump. And a defoaming device provided in the middle of a hose for discharging air, wherein the defoaming device has a vertically long defoaming cylinder, and the inside of the defoaming cylinder is firstly partitioned by a partition plate standing from the bottom. While dividing into a room and a second room, the first,
A communication space communicating with the upper portions of the second chambers is formed, and an inlet for the liquid to be treated having a hose mounting means in the first chamber, a discharge port for the processing liquid having a hose mounting means in the second chamber, and a hose in the communication space. Providing an exhaust port having attachment means, connecting a hose for discharging the chemical solution from the chemical solution tank to the inlet of the liquid to be treated,
A hose leading to the chemical injection pump is connected to a discharge port of the processing liquid, and an exhaust hose is connected to an exhaust port.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 11 denotes a vertically long defoaming cylinder of a defoaming device, which has a bottom 12 and can stand upright. The defoaming cylinder may be a cylinder or a square cylinder, for example, having a diameter of about 30.
mm and a cylinder having a height of about 100 mm. From the bottom 12, a partition plate 13 lower than a defoaming tower having a height of about 80 mm, which divides the inside of the cylinder into two, stands and partitions the inside of the cylinder into a first chamber 14 and a second chamber 15. A communication space 16 that communicates with the upper part of 15 is formed.

An inlet 17 for the liquid to be defoamed is provided below the side wall of the first chamber 14, an outlet 18 for the deaerated processing liquid is provided below the side wall of the second chamber 15, and a defoaming cylinder. Exhaust port 1 at top
9 is provided. The inlet 17, the outlet 18, and the outlet 19
Is preferably provided with a hose mounting means 20.

[0007] The hose mounting means 20 includes, for example, an opening for an inlet and an outlet provided at a lower portion of a side wall of the first chamber and the second chamber as shown in the figure, and an upper end of a defoaming cylinder 11 for an exhaust port. A large-diameter portion 21 fixed to the open portion by bonding or the like, a male screw portion 22 having a smaller diameter than the large-diameter portion and projecting concentrically from the front end of the large-diameter portion, a smaller diameter than the male screw portion, and a male screw portion; A series of liquid passages provided integrally between the large diameter portion 21 and the small diameter front end of the tapered portion, integrally having a tapered portion 23 having a diameter reduced forward from the front end of the portion and projecting concentrically. Body 25 having a central hole 24 for ventilation and ventilation, a female screw part 26 which is screw-engaged with the male screw part 22 of the cylindrical body 25, and a diameter smaller than the inner diameter of the female screw part 26. Part 22
When screwed into the nut, the nut body 28 is provided with a cylindrical portion 27 surrounding the tapered portion 23, and the large-diameter portion 21 is fixed to the opening for the inlet and the outlet, and the upper end opening of the defoaming cylinder, respectively. .

The diameter of the large-diameter end portion of the tapered portion 23 adjacent to the male screw portion 22 is the same as the inner diameter of the hose, and after fitting the end of the hose outside the tapered portion 23, the male screw portion 22 is formed.
When the female thread portion 26 of the nut body is screwed into the nut portion and tightened, the cylindrical portion 27 of the nut body compresses the outer periphery of the hose at the inner periphery thereof to the outer periphery of the large-diameter end portion of the tapered portion 23 adjacent to the male thread portion 22 ( The hose can be attached to the inlet 17, the outlet 18, and the outlet 19 without falling off (see the inlet in FIG. 1B). In this case, in order to attach the hose, the nut body is fitted to the outside of the hose before fitting the hose to the outer periphery of the tapered portion 23. The hose mounting means 20 is not limited to the one shown in the drawing, and the outer periphery of the end of the hose fitted to the outside of the cylindrical body having a hollow part for liquid passage and ventilation is fastened from around the outer periphery of the cylindrical body. Any structure may be used as long as it can be compressed.

Thus, the end of the hose 32 connected to the outlet of the chemical tank 31 is connected to the inlet 17 of the liquid to be treated of the defoaming device, and the outlet 18 of the treating liquid is suctioned by the chemical pump P. The end of the hose 33 connected to the mouth can be connected. Note that the length of the hose 33 is shortened so that the chemical solution discharged from the discharge port 18 of the defoaming cylinder flows through the hose 33 and reaches the suction port of the chemical solution pump P so that air bubbles are not generated again. To

A hose 34 is also attached to the exhaust port 19 to start up. You may support with a support | pillar etc. in order to start a hose. This hose 34 may be raised to a position higher than the height of the chemical liquid tank 31 as shown in FIG. 2A, or the upper part of the hose 34 is bent sideways as shown in FIG. May be attached to the upper part of the chemical tank to communicate with the space above the inside of the tank.

When the chemical pump P is operated in this state, the chemical in the chemical tank 31 flows through the hose 32, is sucked into the first chamber 14 of the defoaming cylinder, flows upward in the first chamber, and then the partition plate. 13 enters the second chamber 15 from the upper end and flows downward in the room.
Bubbles contained in the chemical liquid float together in the first chamber when the chemical liquid flows upward in the first chamber, and are separated from the chemical liquid when the chemical liquid overflows from the upper end of the partition plate into the second chamber. From the communication space 16 to the inside of the hose 34 attached to the exhaust port 19, as shown in FIG.
In the case of (2), it is released to the atmosphere, and in the case of FIG. Separation of bubbles from the chemical solution is performed even when the chemical solution flows through the first chamber and the second chamber in a full state.
In addition, as shown in FIG. 2C, when the height of the hose 34 rising from the exhaust hole is made lower than the height of the chemical solution tank, and an on-off valve V is attached to this hose to remove gas accumulated in the hose,
A receiver such as a bucket is prepared at the outlet of the hose, and the on-off valve V is opened, and when the liquid flows from the hose to the receiver, it is determined that the degassing is completed.

Although the illustrated defoaming cylinder 11 is drawn vertically so as to be self-supporting, the defoaming cylinder may be supported to be inclined with respect to the vertical.

[0013]

The defoaming apparatus of the present invention has a simple structure, is small, and can be easily installed even in a space with a small space. Then, when the generation of air bubbles is clear, the hose may be connected and installed from the beginning at a position close to the chemical injection pump in the middle of the hose connecting the chemical liquid tank of the chemical injection device and the chemical injection pump. Also, the amount of gas (bubbles) generated by the chemical changes depending on the surrounding conditions. Therefore, in the past, a degassing device was not installed because it was a chemical injection device that did not generate much gas in the past, but if a gas generation phenomenon suddenly occurs, disconnect the hose near the chemical injection pump Then, a defoaming cylinder can be connected, and the existing chemical infusion device can be easily remodeled to have a defoaming function.

[Brief description of the drawings]

FIG. 1 (A) is a side view showing a part of a defoaming device in section.
(B) is an enlarged perspective view in which a part of the hose mounting means is shown in cross section.

FIGS. 2A, 2B, and 2C are schematic diagrams of three chemical injection devices having different exhaust hoses.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 defoaming cylinder 12 bottom of defoaming cylinder 13 partition plate 14 first chamber 15 second chamber 16 communication space 17 inlet for liquid to be treated 18 discharge port for treatment liquid 19 exhaust port 20 hose mounting means 31 chemical liquid tank 32, 33 , 34 hose

Claims (3)

[Claims] 1. A defoaming apparatus in which a vertically long defoaming cylinder is provided with an inlet for a liquid to be treated, a discharge port for a processing liquid, and an exhaust port, wherein the inside of the defoaming cylinder is arranged from the bottom. A first partition and a second chamber are defined by a standing partition plate, and a communication space communicating the upper portions of the first and second chambers is formed. The first chamber has an inlet for the liquid to be treated, and a second chamber. A degassing device, characterized in that a discharge port for the treatment liquid is provided in the apparatus, and an exhaust port is provided in the communication space. 2. The defoaming apparatus according to claim 1, wherein hose inlets are provided at an inlet of the liquid to be treated, an outlet of the processing liquid, and an exhaust port. 3. A chemical tank for storing a chemical, a chemical pump for supplying the chemical in the chemical tank to the outside by a discharge pipe, and a hose provided for discharging the chemical from the chemical tank to the chemical pump. The defoaming device comprises a vertically long defoaming cylinder, and the interior of the defoaming cylinder is divided into a first chamber and a second chamber by a partition plate standing from the bottom. At the same time, a communication space communicating with the upper portions of the first and second chambers is formed, and an inlet for a liquid to be treated having a hose attaching means in the first chamber and a treatment liquid having a hose attaching means in the second chamber are discharged. An outlet, an exhaust port having a hose mounting means in the communication space is provided, a hose for discharging the chemical solution from the chemical solution tank is connected to the inlet of the liquid to be treated, and a hose leading to the chemical injection pump is connected to the outlet for the processing solution, The exhaust hose is connected to the exhaust port. And a chemical injection device.