JPS5820654B2 - Chemical injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quantitative injection device for effervescent chemical liquid.

Sodium hypochlorite solution (hereinafter referred to as SHC), which is produced by trapping chlorine in sodium hydroxide solution, is used as a sterilizer for drinking water, a disinfectant for septic tanks, and other types of production and treatment plants. It is a highly versatile drug.

However, although chlorine is not dangerous or difficult to handle, it is still a highly toxic and powerful drug.
It has troublesome properties that require careful handling.

For example, most metals are severely corroded due to their strong acidic and basic amphoteric nature, and thus device contact parts cannot be constructed using metals.

Physically, it foams actively at room temperature and pressure, and precipitates from the liquid itself and dust mixed in from the outside are often floating and suspended, so a phenomenon similar to paper lock occurs during flow. Therefore, it is not possible to apply pressure to flow, and it is also difficult to control the flow rate by adjusting the flow cross section with valves, etc.

Looking at the current state of progress in the practical application of SHC liquid consumption equipment, apart from large-scale plant-like injection systems in which injection equipment is instrumented and controlled, small-scale equipment with relatively low consumption requires adjustment. There are inconveniences such as the injection amount being halved in a short period of time and the need for constant monitoring and repair, and there is still no equipment that is effective in saving labor in equipment operation and maintenance.

In view of the above points, the present invention provides foamable SH
The purpose of the present invention is to provide a small-sized chemical liquid injection device that can accurately supply a fixed amount of a chemical liquid such as C liquid.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a supply source pipe 2 is connected to the outlet of a chemical solution storage tank 1 filled with a chemical solution, and when a valve 3 attached to this supply source pipe 2' is opened, the liquid inside the drug solution storage tank 1 is The water flows into the filter 4 connected to the supply source pipe 2 and is filtered.

Although the structure of the strainer 4 is not shown in the drawing, the chemical liquid at the set water level is always stored by installing a ball tap, etc., and the chemical liquid after being rinsed is connected to the outlet of the strainer 4. It is designed to flow into a chemical solution supply pipe 5.

A chemical liquid metering unit 10 is connected to the chemical liquid supply v5 via an operation valve 6.

As shown in FIG. 2, the chemical liquid measuring unit 10 includes a valve box 1
1, an inlet passage 12 is formed in this valve box 11,
The inlet passage 12 is connected to the outlet of the operating valve 6.

The valve box 11 also has a first passage 1 which communicates with the inlet passage 12.
3 is formed, and furthermore, a second passage 14 is provided which communicates with both the passages 12 and 13.

A vertically oriented measuring cylinder 15 is connected to the first passage 13, and a lower part of a cylindrical adjusting body 16 is inserted into the cylinder 15, and an O-ring 17 provided on the outer periphery of the cylinder 15 is connected to the first passage 13.
It is closely attached to the inner circumference of.

An exhaust hole 18 is formed in the lower end plate of the adjustment body 16, and a valve shaft 20 of a float valve 19 provided below the exhaust hole 18 is inserted into the exhaust hole 17, and a plurality of protrusions are formed at the upper end of the valve shaft 20. The piece 21 can engage with the upper surface of the end plate of the adjustment body 16.

Note that by forming a screw 22 on the outer periphery of the adjusting body 16 and screwing it into a screw hole 23 formed in the upper end plate of the cylinder 15, the adjusting body 16 can be moved in the vertical direction, making it easier to measure. The amount of chemical liquid flowing into the cylinder 15 can be adjusted arbitrarily.

The second passage 14 is located above the inlet passage 12, and a valve body 24 is provided between the two passages 12,14.

The valve shaft 25 of the valve body 24 is located in the solenoid support frame 27 attached to the upper part of the valve body 11 from the exhaust hole 26 which passes through the second passage 14 and communicates with the second passage 14.
It is connected to a plunger 29 of a solenoid 28 attached to 7.

With this configuration, when the solenoid 23 is actuated to excite the plunger 29, the valve body 24 rises and the second passage 14
The inlet 14/ of the inlet passage 12 is closed and the outlet 12' of the inlet passage 12 is closed.
is opened, and the inlet passage 12 and the second passage 14 can be selectively opened and closed.

In addition, in FIG. 2, a weight 30 is fixed to the plunger 29 to move the de-energized plunger 29 downward, but a spring causes the plunger 29 to move downward.
can also be lowered.

The chemical liquid injector shown in the embodiment has the above-mentioned structure, and its operation will be explained first.

Now, when the operating pulp 6 attached to the chemical liquid supply pipe 5 is opened, the chemical liquid filtered by the filter 4 flows into the inlet passage 12.

At this time, when the solenoid 28 is actuated to raise the valve body 24, the inlet passage 12 is opened by the valve body 24, and the second passage 14 is closed, the medicinal liquid in the inlet passage 12 is
It flows into the passage 13 and into the metering cylinder 15 .

The measuring cylinder 15 is oriented vertically and has an exhaust hole 18 formed in the upper part, so that the gas generated by the flow of air and chemical liquid inside the cylinder 15 is discharged from the cylinder 15.
It rises inside and is discharged to the outside from the exhaust hole 18□, so that the flow of the chemical solution is not obstructed.

Therefore, by opening the inlet passage 12, the internal chemical fluid flows smoothly into the measuring cylinder 15, the amount of inflow of the chemical fluid increases, and when the water level rises to the position of the float valve 19, the rise in the water level of the chemical fluid causes the float Valve 1
9 also rises and finally closes the exhaust hole 18.

When the interior of the metering cylinder 15 is filled with the chemical liquid, the solenoid 28 is activated and the plunger 29 is deenergized.

Since the weight 30 is fixed to the plunger 29, the valve body 24 descends to close the inlet passage 12, and at the same time the second passage 14 opens and communicates with the first passage 13.

Therefore, the medicinal liquid in the measuring cylinder 15 flows from the first passage 13 to the second passage 14, and the medicinal liquid in the same amount as the volume of the measuring cylinder 15 drips by gravity from the discharge port l4/ at the end of the second passage 14. .

By the way, there are methods for dispensing a fixed amount of chemical solution using piston type or diaphragm type pumps, but with such methods, there is always some form of pressure and siphon action during the flow of the drug solution. Therefore, it is difficult to smoothly discharge a chemical solution that foams at room temperature and pressure.

There is also a method of sucking out the chemical solution containing bubbles using forced negative pressure using an injector, etc. Although this method can deal with the generated gas, it requires a complicated process to control the amount of liquid sucked out. A negative pressure adjustment mechanism is required, and pressure fresh water is also required to operate the injector.

However, in this invention, the second
By opening the passage 14, the metering cylinder 15
Since the same amount of liquid medicine as the internal volume of the liquid can be dripped by gravity, there is no stagnation or poor flow of the liquid medicine, and a predetermined amount of liquid medicine can be reliably injected.

In addition, as shown in FIG. 2, the measuring cylinder 15 is of a variable volume type, or as shown by the chain line in FIG.
By extending the passage 13 and connecting it to the metering cylinder 15, the amount of the medicinal solution to be injected can be varied.

Furthermore, by connecting a plurality of measuring units 10 to the chemical liquid supply pipe, the injection amount of the chemical liquid can be arbitrarily changed.

As described above, according to the present invention, by raising the valve body to close the second passage and open the inlet passage,
The chemical solution supplied to the inlet passage flows into the measuring cylinder from the first passage, and after the measuring cylinder is filled with the chemical liquid, by lowering the valve body, the same volume of the chemical liquid as the capacity of the measuring cylinder is poured into the first measuring cylinder. Since it flows from the passage to the second passage and drips by gravity, it is possible to automatically supply a predetermined amount of the chemical solution, which can have a great effect on manpower and labor savings.

In addition, exhaust holes are formed at the top of the metering cylinder and at the top of the second passage, so the gas generated by the flow of the chemical can be automatically vented, preventing the chemical from accumulating in the pipe or preventing it from flowing. The liquid medicine flows smoothly, and a predetermined amount of the liquid medicine can be reliably injected.

Furthermore, if the metering cylinder has a structure in which an exhaust hole is simply formed in the upper part of the metering cylinder, there is a risk that the chemical solution will overflow from the exhaust hole, so it is necessary to maintain the supply pressure of the chemical solution at a constant pressure. , a float valve is provided below the exhaust hole of the metering cylinder, and the exhaust hole is closed by the rise of the float valve, so that the chemical liquid flowing into the cylinder does not overflow from the exhaust hole, and the supply pressure of the chemical liquid is There is no need to take any special measures to keep the value constant, and the device is simple and easy to install.

In addition, since the same amount of chemical liquid as the volume of the measuring cylinder is made to flow from the first passage to the second passage provided above and drip by gravity, the chemical liquid overflows from the exhaust hole provided at the top of the second passage. Moreover, since the valve body can be moved using a solenoid with extremely low power consumption, it can be installed in areas without commercial power supply.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the apparatus according to the present invention, and FIG. 2 is a longitudinal sectional front view showing an enlarged main part of the same. 5... Chemical solution supply pipe, 10... Measuring unit, 11... Valve box, 12... Inlet passage, 13... First Passage, 14...2nd
Passage, 15... Measuring cylinder, 18...
・Exhaust hole, 19...Float valve, 24...
...Valve body, 26...Exhaust hole.

Claims (1)

[Claims] 1 Consisting of a chemical liquid supply pipe and a metering unit connected to this supply pipe, the measuring unit is equipped with a valve box, and the valve box has an inlet passage connected to the chemical liquid supply pipe, and a nozzle communicating with the inlet passage. a second passage located above the inlet passage and communicating with both passages, a valve body for selectively opening and closing the inlet passage and the second passage is provided inside the valve box; A measuring cylinder is connected vertically to the first passage, and an exhaust hole is formed in the upper part of the measuring cylinder,
A chemical liquid injector characterized in that a float valve for opening and closing the exhaust hole is provided inside the metering cylinder, and the exhaust hole is formed in the upper part of the second passage.