JP2002370799A - Volumetric liquid supplying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volumetric liquid supplying apparatus having no power driving source in which its configuration is simple and it can be easily adapted for corrosive chemical product. SOLUTION: There are provided a container 15 arranged to be movable in an upward or downward direction in cooperation with a liquid surface height of liquid 12 stored in a tank 13; a liquid discharging pipe 161 with its one end being immersed in the liquid stored in the tank 13, and with the other end being positioned at a lower position only by a predetermined height from a liquid surface of liquid stored in the tank; a hose 17 cooperatively arranged at the container for use in supplying liquid fed into the container from the tank through the liquid discharging pipe in an outward direction; and a flow rate adjusting means for changing a flowing out amount of liquid from the hose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying a fixed amount of liquid, and more particularly, to an apparatus for supplying a fixed amount of liquid such as a chemical in a water treatment facility. To a feeding device capable of doing so.

[0002]

2. Description of the Related Art For example, in various water treatment facilities such as a cooling water system and a boiler water system, water treatment chemicals such as a slime remover and a scale inhibitor are introduced into the water to be treated. These chemicals need to be charged in a prescribed amount to the water to be treated, and for that purpose, a liquid quantitative supply device is generally used.

[0003] Conventionally, there are two types of liquid fixed-rate supply devices that use power and those that use no power. As shown in FIG. 4, the former is a device for supplying a constant amount of a chemical by a variable metering pump 4 arranged in the middle of a tube 3 connected to a bottom of a tank (reservoir) 1 containing, for example, a chemical 2. As shown in FIG. 5, the latter is a device for supplying the medicine 1 using gravity by opening and closing a valve 5 provided in the middle of a tube 3 connected to the bottom of the tank 1 containing the medicine 2. .

[0004]

However, many of the chemicals to be injected are corrosive, and in an apparatus using the variable metering pump 4, it is necessary to form the pump 4 with a corrosion-resistant material. Equipment becomes expensive. further,
Since the operation requires electrical equipment, running costs also increase.

[0005] On the other hand, the supply device using the valve 5 has the advantage that running costs are low because it is non-powered. However, in order to adjust the flow rate with the valve 5, it is necessary to control the opening time or opening degree of the valve 5, but the amount of outflow from the valve 5 per unit time varies depending on the liquid level in the tank 1. Therefore, the following problem occurs.

That is, as the liquid level in the tank 1 decreases, the hydraulic pressure decreases, and the amount of outflow from the valve 5 per unit time decreases. Therefore, in order to always supply a constant amount of liquid, the valve 5 is connected in conjunction with the decrease in the liquid level.
It is necessary to gradually increase the degree of opening or opening time. This requires constant monitoring of the outflow of liquid, which is very laborious and very difficult to put to practical use.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a fixed-quantity liquid supply apparatus capable of easily and accurately removing a fixed amount of liquid from a tank without using power. Is to provide.

[0008]

In order to solve the above-mentioned problems, the present inventor has conducted various studies focusing on a non-powered liquid supply device having a low running cost. As a result, the liquid level in the tank is always constant. The idea was to provide a liquid outlet in the liquid that moves in conjunction with the decrease in the liquid level while maintaining the liquid level difference. In order to embody this idea, the present inventor has adopted a container that floats on the liquid surface in a state where a fixed length of the tip portion is always exposed from the liquid surface of the tank, and has completed the present invention.

That is, the liquid quantitative supply device of the present invention comprises a tank for storing a liquid, a container provided to be vertically movable in conjunction with the liquid level of the liquid stored in the tank, and The inside and outside of the container are provided at a predetermined height position in the container so as to communicate with each other, one end is opened in the liquid contained in the tank, and the other end is at a predetermined height position in the container. Consisting of a positioned liquid outlet tube,
A communication portion that guides the liquid contained in the tank into the container, a hose that is connected to the container and supplies the liquid guided into the container to the outside, and changes a liquid outflow amount from the hose. And a flow control means for controlling the flow rate.

Preferably, the flow rate adjusting means is means for changing the height of the other end of the liquid extraction pipe in the container, means for changing the height of the liquid immersion portion of the container, or provided on the liquid extraction pipe. This is realized as a means for adjusting the opening degree of the provided valve.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a liquid supply apparatus according to the present invention; FIG. 1 shows one embodiment of the present invention and is a conceptual diagram for explaining the principle of a liquid quantitative supply device. The metering device 11 includes a tank 13 for storing a liquid, for example, a chemical 12.
And a moving mechanism 14 that moves up and down according to the liquid level of the liquid 12 in the tank 13 to take out the liquid 12 from the tank 13 at a constant liquid pressure, and supplies the liquid taken out by the moving mechanism 14 to the outside. And a flow rate adjusting means for changing an outflow amount of the liquid 12 through the hose 17.

First, as shown in FIG. 1, for example, a moving mechanism 14 includes a container 15 floating in a liquid (chemical) 12 contained in a tank 13 and a liquid level difference holding mechanism provided in the container 15. 16 is comprised. The container 15 is a tank 13
The remaining portion is immersed in the chemical 12 in a state where a predetermined length L of the upper end of the peripheral wall is exposed from the liquid level 12a inside, and the floating type floats on the liquid level 12a while maintaining the balance in this state. The material of the container 15 is not particularly limited as long as it can maintain a state in which it floats on the medicine 12 while maintaining the exposure length L.
When the chemical 12 is corrosive, it is preferable that the chemical 12 is formed of a material having corrosion resistance.

The shape of the container 15 may be various, such as a box shape or a cylindrical shape, and is not particularly limited. The liquid 12 guided from the tank 13 is supplied to a hose 17 connected to the lower end thereof. In consideration of the above, it is preferable that the lower portion has a funnel shape whose diameter is gradually reduced as shown in FIG. As described above, the hose 17 connected to the lower end of the container 15 is connected to the liquid supply port 13 formed in the lower part of the tank 13.
At a, it is connected to one end 18a of the supply hose 18. The other end 18b of the supply hose 18 is connected to, for example, a liquid injection point 19 in a water treatment facility (not shown).

The hose 17 is wound, for example, in a coil shape. By winding in a coil shape in this manner, there is an advantage that the hose 17 can be smoothly lowered when the container 15 is lowered at the same time when the liquid level 12a of the chemical 12 is lowered. Further, the material of the hose 17 is not particularly limited, but it is preferable that the hose 17 be flexible since it is wound in a coil shape as described above, and that it be further resistant to chemicals.

The liquid level difference holding mechanism 16 provided in the container 15 is as follows. That is, an opening 15a is formed at a predetermined position on the side wall of the container 15, and this opening 1a
The base end 161a of the tube (liquid extraction tube) 161 at 5a
Are mounted liquid tight. Tip 1 of tube 161
61b is open to the space in the container 15, and this tip 161b
The difference between the height of the chemical 12 and the liquid surface 12a is the liquid level difference D.

The liquid level difference holding mechanism 16 will be described in more detail with reference to FIG. That is, as shown in FIG. 2, a support bar 162 is fixedly provided at an upper portion of the side wall of the container 15, and a height adjusting screw 163 is screwed into a screw hole 162 b formed at a tip 162 b of the support bar 162. Has been entered. The distal end 161b of the tube 161 is fixed to the lower end 163a of the height adjusting screw 163, and the height of the distal end 161b of the tube 161 in the container 15 is determined by adjusting the height adjusting screw 163. . Since the container 15 descends while maintaining the exposure length L as the liquid level 12a descends, if the tube tip 161b is fixed as described above, the liquid level difference D from the liquid level 12a is always constant. Will be retained.

Further, the fixed-quantity supply device 11 is provided with the following means for increasing or decreasing the supply amount of the chemical 12.
The first means is to fix the height of the tube tip 161b to one of the positions lower than the liquid level 12a by the height adjusting screw 163 in the container 15 shown in FIG. As a result, the liquid level difference D is increased or decreased as necessary, and the liquid 1 flowing out of the tank 13 into the container 15 according to the liquid level difference D is adjusted.
Since the outflow pressure of 2 changes, as a result, it is possible to increase or decrease the amount of liquid supplied from the container 15 to the outside via the hose 17.

The second means for increasing or decreasing the supply amount is to change the exposed length L of the upper end of the container 15 while keeping the position of the tube tip 161b fixed. That is, FIG.
As shown in (1), a detachable weight 20 is attached to the lower part of the container 15 while maintaining the balance of the container 15, and the exposed length L is changed by the load of the weight 20. As a result, the liquid level difference D can be changed in the same manner as in the first means described above, so that the supply amount of the liquid can be adjusted.

A third means for increasing or decreasing the supply amount is a method in which the opening of the valve 21 provided in the middle of the tube 161 is changed while the liquid level difference D is kept constant. That is,
By increasing or decreasing the opening of the valve 21, the resistance to the flow can be increased or decreased, and the flow can be increased or decreased accordingly. Any one of these supply amount increasing / decreasing means may be adopted, but two or all three may be used in combination. For example, after the liquid level difference D is determined by the first or second means, the third means, ie, the valve 2
For example, a method of performing fine adjustment by adjusting the opening degree of No. 1 can be considered.

The supply of the chemical 12 in the tank 13 is stopped by closing the valve 21 attached to the tube 161 or by using a height adjusting screw as shown by a broken line in FIG. When the tip 161b is
This is made possible by either means of fixing at a position higher than a. In the liquid supply apparatus 11, first, the difference D between the liquid level 12 a of the chemical 12 in the tank 13 and the height of the tip 161 b of the tube 161 in the container 15 is determined according to the supply amount of the chemical 12. Then, the valve 21 provided on the tube 161 is opened. At this time, the tip 16 of the tube 161 is
When the supply of the chemical 12 is stopped by fixing the liquid 1b at a position higher than the liquid level 12a, the chemical 12 is immediately transferred to the tube 16 when the tip is lowered to the position of the liquid level difference D.
1 and flows into the container 15. On the other hand, the tube 16
By closing the valve 21 provided in the middle of
When the supply of the chemical 2 is stopped, the supply of the chemical 12 may be started by opening the valve 21.

At this time, the amount of the chemical 12 flowing out to the container 15, more precisely, the flow rate per unit time, depends on the liquid level difference D set as described above. And medicine 1
When the liquid level 12a in the tank 13 lowers due to the outflow of 2, the container 15 lowers at the same time, and at the same time, the position of the tip 161b of the tube 161 in the container lowers by the same amount. As a result, the initially determined liquid level difference D is maintained.

Thus, the container 1 floating on the medicine 12
Until 5 is completely lowered in the tank 13, the outflow amount of the chemical 12 into the container 15 per unit time is kept constant.
Then, a hose 17 and a supply hose 18 are supplied from the container 15.
The supply of the liquid 12 is performed via the liquid supply, so that a fixed amount of liquid can be supplied at the liquid injection point 19. If the tip of the injection hose is branched into a plurality of lines (three in FIG. 1), it is possible to simultaneously inject a plurality of injection points 19, 23, and 24 at substantially the same amount in three injection points. Becomes possible.

Further, for example, another set of the container 15 and the hose 17 and the supply hose 18 is prepared, and
By setting the liquid level difference D between the tip 161b of the tube 161 in the tube 5 and the liquid level 12a to be larger or smaller, it is possible to cope with another liquid supply point with a supply amount larger or smaller than the above supply amount. Can be. By disposing a plurality of such sets of containers, it is also possible to perform a fixed amount supply to a plurality of injection points with different supply amounts.

FIG. 3 shows another embodiment of the liquid quantitative supply apparatus of the present invention. In the figure, a fixed quantity supply device 31 is provided in a storage box 3 in which a container 34 and a hose 35 are stored adjacent to a tank 33 in which a medicine 32 is stored.
The configuration is the same as that of the above-described fixed quantity supply device 11 except that 6 is provided as a separate body. This storage box 36
Communicates with the tank 33 through the communication passage 37.

Therefore, the medicine 32 in the tank 33 flows into the storage box 36 through the communication passage 37, and the liquid surface 32a 'of the medicine 32 in the storage box 36 always becomes the liquid surface 32a of the medicine 32 in the tank 33. Is maintained at the same liquid level as. The container 34 has a liquid level difference holding mechanism (not shown) as described in detail with reference to FIG. A hose 35 wound in a coil shape is connected to the lower end of the container 34, and is connected to one end 40 a of the supply hose 40 at a liquid outlet 36 a formed at the bottom of the storage box 36. The other end 40b of the supply hose 40 is
It is connected to the.

In the container 34, the above-described quantitative supply device 1 is provided.
1, the liquid 32 in the storage box 36
A tube 341 is attached to which a is communicated and a distal end 341b opens into the space of the container 34. The valve 42 is provided in the middle of the tube 341. Also,
Also in this fixed-quantity supply device 31, as a means for increasing or decreasing the liquid amount, one using a screw for adjusting the height in the container as described above, attaching a detachable weight to the container, and One that changes the exposure length and one that changes the opening degree of the valve 42 provided in the middle of the tube 341 are mentioned.
More than one species can be used in combination.

The operation of the fixed quantity supply device 31 is the same as that described above. First, the liquid level 32a of the medicine 32 in the tank 33 (storage box) is changed according to the supply amount of the medicine 32.
(32a ') and the tip 3 of the tube 341 in the container 34
The difference D ′ from the height of 41b is determined. At this time, medicine 3
The outflow amount of No. 2, that is, the flow rate per unit time, corresponds to the liquid level difference D ′.

The outflow of the chemical 32 causes the tank 33
When the liquid level 32a in the container falls, the liquid level 32a 'in the storage box 36 also drops by the same amount, and as a result, the position of the tip 341b of the tube 341 in the container 34 also drops by the same amount. Therefore, the initially determined liquid level difference D 'is maintained to the end. In this way, the outflow amount of the chemical 32 per unit time is kept constant until the container 34 floating in the storage box 36 is completely lowered in the box 36, and the constant-rate supply at the liquid injection point 41 becomes possible.

Further, also in this fixed-quantity supply device 31, the supply hose 40 is branched into a plurality of tubes immediately before the liquid injection point 41 (not shown), so that the chemicals 32 can be supplied to a plurality of locations in approximately equal amounts. It becomes possible. Also, two or more sets of the storage box 36, the container 34, the hose 35, and the supply hose 40 are prepared, each of which is communicated with the tank,
If the liquid level difference is set for each box, 2
It is possible to simultaneously supply a constant amount of different liquids to more than one injection point.

In this embodiment, the container 34 is
Since it is stored in a storage box separately provided, there is an advantage that the complexity of floating a plurality of containers in the tank is reduced. Even if the chemical contained in the tank is, for example, corrosive, the liquid-contacting parts to be considered for corrosion resistance are only containers, tubes, hoses, and supply hoses, so that measures against corrosion can be performed easily and inexpensively. The cost is very low as compared with the case where the conventional variable pump is made corrosion resistant. In addition, there is an advantage that constant-volume supply is always possible without power, and that the amount of liquid can be arbitrarily changed by a simple mechanism.

[0031]

As described above, the liquid quantitative supply device of the present invention can supply a fixed amount of liquid with no power and with a simple structure, so that the equipment cost and the running cost can be reduced. Having. Therefore, its industrial value is extremely large in various water treatment facilities.

[Brief description of the drawings]

FIG. 1 is a conceptual configuration diagram illustrating the principle of a liquid quantitative supply device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an example of a configuration of a container in the quantitative supply device shown in FIG.

FIG. 3 is a conceptual configuration diagram showing the principle of a liquid quantitative supply device according to another embodiment of the present invention.

FIG. 4 is a conceptual diagram illustrating an example of a conventional liquid quantitative supply device.

FIG. 5 is a conceptual diagram showing another example of a conventional liquid fixed-rate supply device.

[Explanation of symbols]

 11, 31 Liquid quantitative supply device 12, 32 Liquid (chemical) 12a, 32a, 32a 'Liquid level 13, 33 Tank 15, 34 Container 16 Liquid level difference holding mechanism 17, 35 Hose 18, 40 Supply hose 19, 23, 24,41 Injection point 20 Weight 21,42 Valve 161,341 Tube (liquid extraction tube)

Claims (3)

[Claims] 1. A tank for storing a liquid, a container provided to be movable up and down in conjunction with a liquid level of the liquid stored in the tank, and a container provided at a predetermined height position in the container. A communication part provided in communication between the inside and the outside of the container to guide the liquid stored in the tank into the container, and a hose connected to the container to supply the liquid guided into the container to the outside And a flow rate adjusting means for changing a flow rate of the liquid from the hose. 2. The container comprises a floating container which floats while maintaining a balance in a state where a part thereof is immersed in a liquid stored in the tank, and one end of the communication portion is stored in the tank. 2. The liquid supply apparatus according to claim 1, comprising a liquid discharge pipe that opens into the liquid and has another end positioned at a predetermined height in the container. 3. A liquid level difference adjusting mechanism for changing the height of the other end of the liquid extraction pipe in the container, wherein the flow rate adjusting means changes the height of a liquid immersion portion of the container. The liquid supply apparatus according to claim 2, wherein the liquid supply device is at least one selected from a means for adjusting a position difference, and a means for changing an opening degree of a valve disposed in the hose for taking out the liquid.