JPH0614865Y2 - Chemical liquid automatic supply control device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a water treatment chemical (hereinafter referred to as chemical liquid) added to suppress various obstacles that occur in a circulating water (hereinafter referred to as cooling water) circuit of a cooling tower or the like. The chemical solution automatic supply device for maintaining the concentration of ()) at a specified amount and, if necessary, a blow that automatically replaces the change in water quality due to the concentration of cooling water caused by the evaporation of cooling water in the cooling tower by blowing. And a control device.

(Prior Art) Since various obstacles such as algae, scales, and rust occur in a cooling water circuit such as a cooling tower, a chemical solution is added to the cooling water in order to suppress such obstacles. However, if the cooling water scatters in the circulation or evaporates and is lost outside the circuit system, the cooling water is affected thereby. That is, when the cooling water is scattered and evaporated, there is a problem that the cooling water is mainly concentrated and the water quality is changed.

If the water level in the aquarium drops due to scattering or evaporation, make-up water is supplied to the aquarium and the chemical solution is added.If the water quality changes due to concentration, the make-up water is added to the aquarium to cool the water. The water quality is controlled by making it overflow (hereinafter referred to as "blowing of cooling water").

Conventionally, the chemical solution is added according to the amount of makeup water. In other words, the addition of a chemical solution is an electromagnetic quantitative injecting device that incorporates a pulse transmission type flow meter that emits a signal every time a fixed amount of makeup water passes, into the makeup water pipe of the cooling tower, and operates every time a signal from this flow meter is received. It is done by.

The reason why this pulse transmission type flow meter is used is that when the cooling water is replenished by opening and closing the ball tap, the open / closed state is affected by the ripple of the water level in the water tank. This is because various changes such as 1/3 opening and so on, and repeated subtle water supply operations make it difficult to make the amount of makeup water per unit time uniform and the amount of chemical liquid added is not stable.

Therefore, a control device or the like for measuring the passage amount of the makeup water is required. Therefore, the passage water amount is measured by using a pulse transmission type flow meter that emits a signal for each passage of a fixed amount of the makeup water.

Regarding the blowing of cooling water, the concentration of cooling water in the circulation system is regarded as a change in the conductivity of the cooling water, and the conductivity of the circulating cooling water is constantly measured by the conductivity meter for the cooling tower (water). Then, when the conductivity exceeds a preset value, supplementary water is forcibly supplied to blow cooling water to lower the conductivity. Therefore, it has been necessary to blow the makeup water by using a makeup water circuit incorporating an electromagnetic valve interlocked with the conductivity meter in addition to the ordinary makeup water circuit.

(Problems to be solved by the invention) In the conventional cooling water control means, the device for supplying the replenishing water together with the addition of the chemical liquid and the device for blowing the cooling water are completely separate from each other, and Since they are operated by completely separate controls, these devices are considerably expensive and require extremely fine management, so that inexpensive and simple devices have been desired.

The present invention has been made to solve the above-mentioned conventional problems, and provides a device that can freely supply a prescribed amount of a chemical solution to a water tank such as a cooling tower together with supplementary water and blow cooling water as necessary. It is an object of the present invention to provide a device capable of controlling the water quality of cooling water to a specified value.

(Means for Solving the Problems) In order to achieve the above object, the present invention interposes a quick water supply valve in the middle of a water supply pipe for supplying water to a water tank such as a cooling tower, and The quick water supply valve is provided with a water supply on-off valve 10 that opens and closes the water passage by the pressure difference applied to the front and back of the valve on the stop valve seat 6 of the water passage that reaches the makeup water port 8 through the stop valve seat 6 that is connected to the water supply main 5. The main body is partitioned into a closing valve seat 6 side and a pressure chamber 13 side, and the vertical movement of the float associated with the elevation of the water surface in the water tank is changed into opening and closing of the valve and supplied to the pressure chamber 13 side. Connect a ball tap that discharges water, and when the water level in the water tank drops below a predetermined value, the ball tap valve opens, the water pressure in the pressure chamber 13 drops, and the quick water supply valve opens to supply makeup water to the water tank. It has a structure that can be operated and operates by the pressure change on the pressure chamber 13 side. The force switch is provided, in which a structure having a metering injection machine in conjunction with the pressure switch adding chemical to the aquarium.

A make-up water receiving cup 22 having a hole at the bottom is attached to the arm portion 2b of the ball tap 2 so that the valve of the ball tap can be opened and closed at once.

In addition, the pressure switch 17 is connected to the pressure switch 17 so as to automatically supply makeup water for blowing the circulating water.
A timer 24 interlocking with is connected, the supply time of replenishment water is integrated by this timer 24, and another timer (sub-timer 25) that operates by receiving the signal of the timer 24 at fixed intervals is provided. The solenoid valve (blow solenoid valve 26) whose water supply is controlled by the timer (sub-timer 25) is installed in the conduit (pressure conduit 16) connecting the pressure switch 17 and the pressure water outlet 15 in the quick water supply valve 4. It is provided.

(Operation) With the above-described configuration, when the water level in the water tank falls below a predetermined water level, the valve of the ball tap 2 opens and the water in the ball tap 2 flows out, whereby the pressure chamber 13 of the quick water supply valve 4 is discharged. The water pressure is reduced, the water supply on-off valve 10 is separated from the shutoff valve seat 6, and the quick water supply valve 4 is opened, so that makeup water is supplied to the water tank. At this time, the water pressure in the ball tap 2, that is, the water pressure in the pressure chamber 13 is changed to the pressure water outlet 15 and the conduit (pressure conduit 16) in the quick water supply valve 4 connected to the ball tap 2.
Quantitatively controllable discharge rate per unit time by guiding to a separately provided pressure switch 17 via the, operating the pressure switch 17, and opening / closing the contact of the pressure switch 17 as an electric on-off control signal. Operate the injection machine (quantitative pump 18) and add the specified amount of chemical solution according to the makeup water.

The amount of this make-up water is constantly constant due to the function of the constant flow valve 3 of the quick water supply valve 4, and the operation of the metering injector (metering pump 18) for supplying the chemical liquid is under pressure on the conduit (pressure conduit 16). Turns off sometimes and turns on when pressure is not applied.

When the water supply to the cooling tower water tank 1 is affected by the ripple of the water surface of the water tank and the delicate water supply operation is repeated, a supplementary water receiving cup 22 having a hole at the bottom of the arm portion 2b of the ball tap 2 is used as an auxiliary device. Mounting and opening / closing operations of the ball tap 2 valve are controlled to be fully opened or fully closed all at once, so that the amount of replenishment water per unit time is made constant irrespective of ripples in the liquid level in the water tank.

On the other hand, to control the concentration of cooling water to a constant level,
It is necessary to blow the cooling water. This can be calculated by performing a simple calculation separately, and the required blowing amount can be calculated with respect to the total makeup water amount, and this water amount can be forcedly blown. The blow amount is adjusted by accumulating the replenishment time of the cooling water by the timer 24 connected to the pressure switch 17 and operating another timer (sub-timer 25) at fixed intervals.

Another timer (sub-timer 25) puts the quick water supply valve 4 into the water supply state, so that a solenoid valve (blow solenoid valve 26) incorporated in advance in the conduit (pressure conduit 16) connected to the quick water supply valve 4 is used.
It controls the opening and closing of. When the solenoid valve (blow solenoid valve 26) is opened, the pressure in the conduit (pressure conduit 16) is released, the water supply state is reached, the water supply is forcibly started, the overflow state is established, and the cooling water is controlled to a constant concentration level. You can

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a system diagram of the present embodiment configured to supply makeup water to a cooling tower water tank 1 and to add a chemical solution, and forcibly blow makeup water, and FIG. 2 shows a liquid level control means. Is integrated with the ball tap 2 as
1 is a structural diagram of a quick water supply valve 4 (hereinafter referred to as water supply valve main body 4) having a constant flow valve 3 built therein.

In the figure, a main water supply pipe 5 is connected to one end of a water supply valve main body 4, and a ball tap 2 is connected to the other end. The water supply valve body 4 is installed in a space inside the cooling tower so that makeup water supplied from the water supply main pipe 5 is dropped into the cooling tower water tank 1.

Next, the structure of the water supply valve body 4 will be described. The water supply valve main body 4 has a constant flow valve 3, a closing valve seat 6, a makeup water inlet 7, a makeup water port 8, and a makeup water pipe 9, that is, a closure valve seat 6.
A route is formed. Make-up water from the main water supply pipe 5 is supplied to the cooling tower water tank 1 through the path of the shutoff valve seat 6.

A water supply on-off valve 10 is provided in close contact with the stop valve seat 6, and the control of water supply is determined by the positional relationship between the water supply on-off valve 10 and the stop valve seat 6. That is, when the water supply on-off valve 10 is in close contact with the shutoff valve seat 6, the water supply is stopped, and when it is separated, the water supply is performed.

The water supply opening / closing valve 10 receives water pressure from two directions. One is pushing the water supply on-off valve 10 from the direction of the closing valve seat 6 with the cross-sectional area of the makeup water inlet 7 from the water supply main 5 through the constant flow valve 3 and the makeup water inlet 7, and the other is the water supply. The water supply on-off valve 10 is pressed against the shut-off valve seat 6 from the direction of the pressure chamber 13 passing through the control water conduit 11, the control water outlet valve 12, and the pressure chamber 13 from the main pipe 5. That is, the water supply on-off valve 10 is mounted in such a manner that the water pressure on the shut-off valve seat 6 side and the water pressure on the pressure chamber 13 side are shut off in these two directions, and the front and rear surfaces of the water supply on-off valve 10 have the same water pressure. is recieving.

Now, assuming that the water supply on-off valve 10 receives the same water pressure from the closing valve seat 6 direction and the pressure chamber 13 direction at the same time, the moving direction of the water supply on-off valve 10 is determined by the size of the surface on which the water pressure is applied.
The area (pressure receiving area) of the portion where the water supply on-off valve 10 receives pressure is wider on the pressure chamber 13 side. Therefore, the water supply on-off valve 10 is pressed against the closing valve seat 6 and closely contacts the closing valve seat 6 to stop the water supply.

Further, the pressure chamber 13 and the ball tap 2 are connected by a thin tube 14, and the makeup water in the pressure chamber 13 flows to the ball tap 2 side. When the cooling water in the cooling tower water tank 1 evaporates or scatters and the water level in the cooling tower water tank 1 drops, the float 2a of the ball tap 2 also goes down and the valve body 2c of the ball tap 2 descends and separates from the valve seat 2d. As a result, the ball tap 2 is opened, and the makeup water in the pressure chamber 13 flows from the pressure chamber 13 into the cooling tower water tank 1 through the narrow tube 14 and the opening (not shown) of the ball tap 2. Along with this outflow, the water pressure on the pressure chamber side decreases and the feed water opening / closing valve 10 separates from the closing valve seat 6, so that makeup water is supplied to the cooling tower water tank 1 through the closing valve seat 6 route.

The outflow rate through the thin tube 14 is adjusted by the control water withdrawal valve 12. That is, when the outflow amount is larger than the adjustment amount, the water supply on-off valve 10 moves to the pressure chamber 13 side and is completely separated from the shutoff valve seat 6 to supply water.

Further, in the case where the water surface of the cooling tower water tank 1 has ripples and the float 2a of the ball tap 2 swings up and down due to the ripples, and the water supply operation of the water supply valve body 4 is repeated intermittently, the control water extraction valve 12 By increasing the opening degree, the pressure of the pressure chamber 13 increases, the water supply on-off valve 10 closes close to the stop valve seat 6 and the water supply stops, and the water supply due to the minute displacement of the float 2a of the ball tap 2 occurs. Can be prevented.

In the water supply state as described above, the pressure at the opening of the ball tap 2 and the water pressure in the pressure chamber 13 decrease, so this pressure change is connected to the pressure water outlet 15 and the pressure water outlet 15, that is, a conduit or pressure conduit. It leads to the pressure switch 17 via 16 and closes the contact, and the fixed quantity pump as a fixed quantity injection machine.
The metering pump 18 is operated by turning on the power source of 18, and the chemical solution in the chemical solution tank 19 is passed through the chemical solution suction pipe 20.
It is inhaled and added to the cooling tower water tank 1 through the chemical discharge pipe 21.

On the other hand, during pressurization, that is, when the water level in the cooling water tank 1 rises and the pressure in the pressure chamber 13 increases, the contact point of the pressure switch 17 opens and the power source of the metering pump 18 turns off. Since the discharge rate per minute of the metering pump 18 can be adjusted arbitrarily,
It is possible to adjust the cooling water to have a predetermined concentration with respect to the makeup water regulated to a constant amount by the constant flow valve 3.

When the water supply to the cooling tower water tank 1 is affected by the undulation and the delicate water supply operation is repeated, a supplementary water receiving cup 22 having a hole 22a at the bottom is attached to the arm portion 2b of the ball tap 2 as an auxiliary device. The amount of water leakage through the hole provided at the bottom of the cup 22 is smaller than the amount of makeup water supplied. By attaching this makeup water receiving cup 22, the operation of the ball tap 2 is controlled to be fully open or fully closed at the time of replenishment,
The amount of make-up water per unit time can be made constant.

When the supply of makeup water is stopped, the makeup water is supplied to the cooling tower water tank 1, and when the water level in the water tank 1 rises, the float 2a of the ball tap 2 gradually rises and the ball tap 2 closes, so that the pressure chamber 13 The pressure is higher than the pressure on the side of the shutoff valve seat 6 and the feed water opening / closing valve 10 comes into close contact with the shutoff valve seat 6 to close the supply water port.

In addition, for the cooling water blow function that controls the cooling water concentration to a constant level, a 24-hour timer installed in the control box 23 while the metering pump 18 is operating.
Energize 24 and run timer 24 at the same time. Since the metering pump 18 operates when supplying makeup water, the 24-hour timer 24
The operating time of indicates the water supply time, and the total water supply amount can be grasped by the constant flow valve 3.

The 24-hour timer 24 has the function of transmitting a signal when the contact built in the 24-hour timer 24 is opened and closed when an arbitrary accumulated time is reached. The sub timer 25
To run.

The sub-timer 25 controls opening and closing of the blow solenoid valve 26. When the blow solenoid valve 26 is opened, the water pressure in the pressure conduit 16 and the pressure chamber 13 is released from the pressure water outlet 15, and when the ball tap 2 is displaced as described above. Water is supplied by the same principle. At this time, water supply starts regardless of the position of the float 2a of the cooling tower water tank 1, but the water level in the cooling tower water tank 1 is changed to the overflow pipe 27.
The water quality of the cooling water is controlled to a certain degree by raising the temperature to a higher level than the drainage port 27a and forcibly discharging the cooling water.

The cumulative time until the start of blowing and the setting of the blowing time are determined by the following calculations.

B = Force blow amount = E / (N-1) -W (m 3 / Hr) ··
.. (I) [E = evaporated water amount = R × ΔT / 560 (m ³ / Hr)] R: circulating water amount = 13 / mim = 0.78m ³ / Hr ΔT: temperature difference (° C.) W between inlet and outlet of cooling tower = Amount of water splashed = R x α (m ^{3 /} Hr) = 0.78 x α α: Determined according to the cooling tower specifications. Normally, the blow rate per cooling tower water tank 1R · T (R · T is a number indicating the scale of the cooling tower) is determined by the formula 0.001 (I), so the constant flow valve 3
The blow time can be determined by dividing by the water flow rate (/ minute). Also, the signal transmission interval (minutes) to the sub-timer 25 of the 24-hour timer 24 is obtained by dividing 0.78 by the water flow rate (/ minute) of the constant flow valve 3 and multiplying by the scale of the cooling tower, as described above. You can

(Effect of the Invention) As described in detail above, since the present invention has the above-described configuration, it is possible to provide an inexpensive chemical solution automatic feeder for a cooling tower or the like, which is free from malfunctions and easy to maintain.

[Brief description of drawings]

FIG. 1 is a system diagram of the present embodiment configured to supply makeup water to a cooling tower water tank and to forcibly blow makeup water while adding a chemical solution, and FIG. 2 is configured integrally with a ball tap and has a constant flow rate. Structure diagram of quick water supply valve with built-in valve, No. 3
The figure is a side view of that of FIG. 1 ... Cooling tower water tank 2 ... Ball tap 3 ... Constant flow valve 4 ... Rapid water supply valve 16 ... Pressure conduit 17 ... Pressure switch 18 ... Metering pump 26 ... Blow solenoid valve

Claims (3)

[Scope of utility model registration request] 1. A quick water supply valve is interposed in the middle of a water supply pipe for supplying water to a water tank such as a cooling tower, and the quick water supply valve passes through a stop valve seat 6 connected to a water supply main pipe 5 and a supply water port 8 A water supply on-off valve 10 that opens and closes the water passage by a pressure difference applied to the front and back of the valve is provided in the stop valve seat 6 of the water passage leading to , The pressure chamber 13 side is connected to a ball tap that changes the vertical movement of the float associated with the elevation of the water level in the water tank into the opening and closing of a valve to discharge the water supplied into the pressure chamber 13, and the water level in the water tank is a predetermined value. When the pressure falls below, the ball tap valve opens, the water pressure in the pressure chamber 13 decreases, and the quick water supply valve opens to make it possible to supply makeup water to the water tank. A pressure switch to operate is provided, and medicine is added to the water tank in conjunction with the pressure switch. Chemical automatic supply control apparatus characterized in that a metering injection machine for added. 2. The chemical liquid according to claim 1, wherein a supplementary water receiving cup having a hole at the bottom is attached to the arm portion of the ball tap as an auxiliary device, and the valve of the ball tap is opened and closed at once. Automatic supply control device. 3. A separate timer which is connected to a pressure switch and connected to the timer, integrates the supply time of replenishing water by the timer, and receives a signal from the timer at fixed intervals to operate. An electromagnetic valve whose water supply is controlled by the other timer is provided in the conduit connecting the pressure switch and the quick water supply valve, and the makeup water for blowing the circulating water is automatically supplied. The automatic chemical liquid supply control device according to claim 1, wherein.