WO2022092720A1

WO2022092720A1 - Explosion-proof apparatus for measuring concentration of residual chlorine

Info

Publication number: WO2022092720A1
Application number: PCT/KR2021/014938
Authority: WO
Inventors: 박석원; 김성태; 권경안; 이광호
Original assignee: 주식회사 테크로스
Priority date: 2020-10-26
Filing date: 2021-10-22
Publication date: 2022-05-05
Also published as: KR102389787B1; KR20220054957A

Abstract

The present invention relates to an explosion-proof apparatus for measuring the concentration of residual chlorine, the apparatus comprising: a measurement unit including a light-emitting part and a light-receiving part and having a sample water inlet pipe through which sample water is introduced and a sample water discharge pipe through which sample water after completion of measurement is discharged; a reagent storage unit including a reagent inlet pipe so as to introduce a reagent into the measurement unit; a control unit which, after light generated by the light-emitting part passes through sample water, measures the concentration of an oxidant in the sample water on the basis of a signal received by the light-receiving part; an inlet valve and a discharge valve installed in the sample water inlet pipe and the sample water discharge pipe, respectively, each being configured by a pneumatic valve; and a reagent injection device installed in the reagent inlet pipe so as to control the inflow of a reagent, wherein the reagent inlet pipe at least includes an elastic pipe made of an elastic material, and the reagent injection device is driven by air to press the elastic pipe.

Description

Explosion-proof residual chlorine concentration measuring device

The present invention relates to an explosion-proof residual chlorine concentration measuring device. More specifically, it relates to an explosion-proof residual chlorine concentration measuring device that can be installed in a dangerous area of a ship.

In general, cargo ships transported by sea operate one-way, except for ships that travel round-trip for mutual exchange of similar cargo. And, when returning voyage after navigating one-way in a full state, ballast water is introduced into the ship to improve the balance, safety and steering performance of the ship, and the voyage is carried out in a ballast state.

At this time, the ballast water is filled in one port and transported to another, where it is discharged into the new port. As such, the release of marine organisms and pathogens contained in the ballast water loaded from a distant location is not only harmful to the new environment, but also can be dangerous to both humans and animals in the new port.

The introduction of non-natural marine life into a new ecosystem can have devastating effects on native flora and fauna that may not have natural defenses against the new species. In addition, harmful bacterial pathogens such as cholera may be present in the original port. These pathogens can over time multiply within the ballast tanks and cause disease in the area where they are released.

The risks posed by these marine organisms and pathogens can be controlled by killing the above-mentioned species present in the ballast water.

The electrolysis method is mainly used to sterilize the ballast water, and the ballast water treatment system using the electrolysis method is equipped with a TRO sensor for measuring the TRO of the ballast water.

Here, "TRO" is an abbreviation of "Total Residual Oxidant", which means the total residual oxidizing agent present in the ballast water. Typically, chlorine generated through the electrolysis process oxidizes aquatic organisms in the ballast water and residual chlorine in the remaining chlorine. It is obtained by measuring the numerical value. In the case of electrolysis or chlorine disinfection of seawater or salt water, TRO is replaced with atoms such as bromine instead of active chlorine, and various types of oxidizing agents coexist. It refers to all active oxidizing agents present.

Since the above-described TRO sensor has to operate in various water quality conditions such as fresh water and sea water depending on the route the vessel navigates, a TRO sensor using a DPD reagent that is less sensitive to water quality changes is mainly used.

The DPD type TRO sensor not only includes a transfer pump to inject the reagent from the reagent bottle to the measuring part, but also includes a check valve in the supply pipe to prevent backflow when transferring the reagent through the transfer pump. Complex.

In addition, in order to install the DPD-type TRO sensor in a dangerous area of a ship, it must be designed to have an explosion-proof structure that prevents explosion, and must go through a certification procedure for the explosion-proof structure.

Explosion-proof structures include intrinsic safety explosion-proof, pressure explosion-proof, pressure-proof explosion-proof, and safety-enhanced explosion-proof.

First, when the intrinsically safe explosion-proof structure is applied to the DPD type TRO sensor, significant power is consumed including the solenoid valve and electronic circuit inside the TRO sensor. There is a problem in that it is difficult to satisfy the following (when a resistive load) consumption standard (power consumption 4.08W or less).

In the case of pressure explosion-proof structure, a purge system that injects inert gas must be additionally installed, and air from which moisture and oil have been removed to prevent malfunctions must be injected. There are restrictions that must be installed, etc. In addition, there is a problem in that the price of the purge system is high and a failure occurs easily in a ship environment.

In the case of the explosion-proof structure, it is composed of a sturdy housing because it has to withstand the pressure in case of explosion. When replacing the DPD reagent, the TRO sensor device must be dismantled, so maintenance is inconvenient and the housing price is high.

The present invention has been devised to solve the above problems, and in particular, an object of the present invention is to provide an explosion-proof type residual chlorine concentration measuring device that can be installed in a dangerous area of a ship.

An explosion-proof residual chlorine concentration measuring apparatus according to an embodiment of the present invention devised to achieve the above object includes a light emitting unit and a light receiving unit, the sample water inlet pipe through which the sample water flows, and the sample number through which the measured sample water is discharged Measuring part to which the discharge pipe is installed; a reagent storage unit provided with a reagent inlet tube to introduce a reagent into the measurement unit; a control unit for measuring the concentration of an oxidizing agent in the sample water based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the sample number; an inlet valve and a discharge valve installed in the sample water inlet pipe and the sample water outlet pipe, respectively, and composed of a pneumatic valve; and a reagent injection device installed on the reagent inlet pipe to control the inflow of the reagent, wherein the reagent inlet pipe includes at least an elastic pipe made of an elastic material, and the reagent injection device is driven by air to pressurize the elastic pipe is composed

In addition, the explosion-proof residual chlorine concentration measuring device may further include an air control valve for receiving a signal from the controller to drive the inlet valve, the outlet valve, and the reagent injection device.

In one embodiment, the reagent injection device includes: a housing provided with an inlet and an outlet respectively connected to the reagent inlet tube, in which an elastic pipe connecting the inlet and the outlet is located; a pressure roller that moves in the longitudinal direction of the elastic pipe inside the housing and presses one side of the elastic pipe; and a driving unit for moving the pressure roller in the longitudinal direction of the elastic pipe with air supplied by the air control valve.

Here, the driving unit moves the pressure roller to reciprocate linearly in the longitudinal direction of the elastic pipe, and in the housing, at least a part of the support portion is parallel to the reciprocating movement direction of the pressure roller, and the corner in the direction of the housing inlet is rounded. can be provided.

In addition, the housing may be provided with a height adjustment unit for vertically moving the support portion with respect to the reciprocating direction of the pressure roller.

In an embodiment of the present invention, a plurality of reagent storage units may be provided, and a plurality of pressure rollers may be provided to correspond to the reagent storage units, respectively.

In an embodiment of the present invention, the pneumatic valve may be installed in a danger zone, and the air control valve may be installed in a safety zone or a danger zone.

An explosion-proof residual chlorine concentration measuring device according to an embodiment of the present invention includes a vent provided in the measuring part so that the inside of the measuring part maintains a natural pressure, and the reagent storage part is converted to the measuring part by the natural pressure. It may be installed at a position higher than the measurement unit so that the reagent is injected.

Here, the reagent storage unit, a body having a storage space formed therein to store reagents, and having an opening on one side; a lid installed to be opened and closed in the opening of the body; and an elastic tube having one end connected to the lid and the other end connected to the reagent inlet tube.

In an embodiment of the present invention, the control unit may be configured in an intrinsically safe explosion-proof structure.

According to the present invention, there is an effect of providing an intrinsically safe explosion-proof structure by configuring the inlet valve, the outlet valve, and the reagent injection device included in the residual chlorine concentration measuring device to be controlled by air.

In addition, according to the present invention, by installing the air control valve in the safety zone (Zone 2) to control the inlet valve, the exhaust valve, and the reagent injection device located in the danger zone (Zone 0 or Zone 1), residual chlorine located in the danger zone It has the effect of remarkably reducing the power consumption of the components of the concentration measuring device.

In addition, according to the present invention, the position of the reagent storage unit is higher than that of the measuring unit so that the reagent is injected under natural pressure, thereby simplifying the structure and improving durability.

In addition, according to the present invention, there is an effect that the input amount of the reagent is kept constant by supplying the reagent at a constant pressure (natural pressure).

1 is a block diagram showing an explosion-proof residual chlorine concentration measuring device according to an embodiment of the present invention;

2 is a block diagram showing an explosion-proof residual chlorine concentration measuring device according to another embodiment of the present invention;

3 is a plan view showing a first embodiment of the reagent injection device provided in the explosion-proof residual chlorine concentration measuring device according to the present invention;

4 is a side view of FIG. 3 showing a state before reagent injection,

Figure 5 is a side view of Figure 3 showing a state after the reagent injection,

Figure 6 is a cross-sectional view of Figure 5,

7 is a side view showing a second embodiment of the reagent injection device provided in the explosion-proof residual chlorine concentration measuring device according to the present invention, showing a state before reagent injection;

8 is a side view showing a second embodiment of the reagent injection device provided in the explosion-proof residual chlorine concentration measuring device according to the present invention, showing a state after reagent injection;

9 is a front view showing a state before and after the pressure roller provided in the reagent injection device according to an embodiment of the present invention pressurizes the pipe;

10 is a view showing a reagent storage unit and a measuring unit provided in the explosion-proof residual chlorine concentration measuring device according to the present invention,

11 is a graph showing the relative reactivity (Relative Responsivity) of the light receiving unit provided in the explosion-proof residual chlorine concentration measuring device according to the present invention,

12 is a flowchart illustrating a method for measuring residual chlorine concentration according to the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes “unit” and “group”, “module” and “unit”, “unit” and “unit”, “device” and “system” for components used in the following description are considered only for ease of writing the specification. It is given or used interchangeably, and does not have a distinct meaning or role by itself.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

1 is a block diagram showing an explosion-proof residual chlorine concentration measuring device according to an embodiment of the present invention.

Referring to FIG. 1 , the explosion-proof residual chlorine concentration measuring device 100 includes a measuring unit 110 for measuring the residual chlorine concentration of a sample water, and a reagent for storing the reagent and injecting the reagent into the measuring unit 110 . The reagent storage unit 130, the control unit 150 for generating a control signal according to the sensing information measured by the measurement unit 110, and an air control valve for opening or closing the valves according to the control signal of the control unit 150 ( 170).

The measuring unit 110 is installed so that the light emitting unit 111 and the light receiving unit 113 face each other on both side surfaces. In addition, the measuring unit 110 is formed of a transparent material through which light can pass, so that the light generated by the light emitting unit 111 can pass through the measuring unit 110 to reach the light receiving unit 113 . .

Here, the light emitting unit 111 may be configured as a white LED to measure all three-channel wavelength bands. In addition, the light receiving unit 113 is configured as an RGB sensor having color filters corresponding to Red, Green, and Blue to recognize all wavelengths of three channels. By checking the three wavelength bands, the accuracy can be increased in measuring the concentration of the oxidizing agent colored with DPD, and it can have the advantage of being able to respond to various types of reagents that develop in different colors with one device.

Through this configuration, when the white LED of the light emitting unit 111 is turned on, the intensity (light amount) of the light transmitted from the RGB sensor of the light receiving unit 113 is measured to measure the residual chlorine concentration.

In the measurement unit 110 , a sample water inlet pipe 121 is installed so that the sample water flows in, and a sample water outlet pipe 125 is installed so that the sample water for which measurement is completed is discharged.

In addition, the inlet valve 123 is installed in the sample water inlet pipe 121 , and the outlet valve 127 is installed in the sample water outlet pipe 125 , so that the reagent introduced from the reagent storage unit 130 reacts with the sample water. It is configured so that it can be discharged smoothly afterward.

The explosion-proof residual chlorine concentration measuring device 100 according to an embodiment of the present invention measures the DPD (diethyl-p-phenylende diamine) reagent among various types of devices for measuring the oxidizing agent injected into the ballast water to be measured. A method of measuring the concentration of residual oxidizing agent by reacting with

The TRO measuring device of the DPD method as described above includes a reagent storage unit 130 for storing the DPD reagent as a component because the DPD reagent is added to measure the oxidizing substance concentration after collecting a part of the treated ballast water. . The DPD reagent is mixed with a buffer solution and injected into the measurement unit 110 . The DPD reagent and the buffer solution may be mixed and stored in one container, but it is preferable for storage to be stored in separate containers.

In addition, the reagent storage unit 130 may additionally include a temperature maintaining means (not shown) maintained at a constant temperature to increase the reactivity of the reagent and the expiration date of the reagent.

In the explosion-proof residual chlorine concentration measuring device 100 according to an embodiment of the present invention, the reagent storage unit 130 is installed at a higher position than the measuring unit 110 so that the reagent is injected into the measuring unit 110 by natural pressure. do.

In addition, a reagent inlet pipe 140 is installed between the reagent storage unit 130 and the measurement unit 110 so that the DPD reagent stored in the reagent storage unit 130 is smoothly supplied to the measurement unit 110 containing the sample water. , a reagent injection device 200 is installed in the reagent inlet pipe 140 to control the inflow flow of the reagent, and in the present invention, it is operated by air to minimize power consumption. A specific configuration of the reagent injection device 200 will be described later.

A plurality of reagent storage units 130 may be provided as shown in FIG. 1 . By configuring both the first reagent storage unit 130a and the second reagent storage unit 130b to store reagents, even if all of the reagents in the first reagent storage unit 130a are consumed, the second reagent storage unit 130b is preliminary. ) through which the reagent can be supplied, enabling continuous reagent supply.

Here, the reagent inlet pipe 140 may be configured as a chemical resistant tube to prevent corrosion and damage by the supplied reagent.

On the other hand, the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention includes an inlet valve 123 and a discharge valve 127, which replaces the conventionally used solenoid valve with a pneumatic valve (Pneumatic). valve) to minimize power consumption. In addition, the reagent inlet pipe 140 provided in the present invention includes at least an elastic pipe made of an elastic material, and the reagent injection device 200 driven by air is configured to press the elastic pipe, so that it has an intrinsically explosion-proof structure and has a reagent It is possible to supply the reagents built into the inlet pipe 140 .

That is, when the inlet valve 123, the discharge valve 127, and the reagent injection device 200 are configured as a solenoid valve as in the prior art, since the power consumption of the solenoid valve is 2W or more, 8W is used when four valves are simultaneously driven. Exceeded, it is impossible to satisfy the standards of the intrinsically safe explosion-proof structure, but the pneumatic valve applied to the present invention can be driven at 0.5 W or less, and the inlet valve 123 by the air control valve 170, By enabling the driving control of the discharge valve 127 and the reagent injection device 200, the explosion-proof residual chlorine concentration measuring device 100 of the present invention as a whole can satisfy the standards of an intrinsically safe explosion-proof structure, and is installed in a dangerous area of a ship. it becomes possible

The reagent injection device 200, the inlet valve 123, and the discharge valve 127 are driven by first to fourth

air control valves

173a, 173b, 175 and 177, and the first to fourth

air control valves

173a , 173b, 175, 177) is configured so that air is driven while pressurizing the reagent injection device 200, the inlet valve 123, and the outlet valve 127 when opened.

Here, it is preferable to use the air control valve 170 of low power (for example, 0.1W to 0.5W) that can satisfy the intrinsically safe explosion-proof structure as the air control valve 170 . The operation of the air control valve 170 is performed by the control unit 150 .

In addition, in the embodiment of the present invention, the explosion-proof residual chlorine concentration measuring device 100 may be provided with means for supplying power to the control unit 150 and the air control valve 170 .

On the other hand, in the explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, an air vent unit (not shown) may be formed in at least one of the measuring unit 110 and the reagent storage unit 130 of FIG. 1 . can Through this, the pressure applied to the measurement unit 110 is maintained as a natural pressure, and the reagent and sample water can be smoothly introduced and discharged. In this way, by supplying the reagent at a constant pressure (natural pressure), the amount of the reagent can be kept constant.

Here, the air vent unit (not shown) may be formed in the form of a vent hole, but is configured to perform the function of an air vent through the overflow pipe 160 connected to the measuring unit 110 as shown in FIG. 1 . You may.

At this time, the overflow pipe 160 can simultaneously perform an overflow function and an air vent function for discharging when the number of samples in the measurement unit 110 overflows. The overflow pipe 160 is preferably connected to the upper end of the measuring unit 110 so that the overflow pipe 160 performs an air vent function well.

The control unit 150 measures the residual chlorine concentration of the sample water based on a signal received from the light receiving unit 113 after the light generated by the light emitting unit 111 passes through the sample water.

Here, if the number of samples is not filled in the measurement unit 110 after the inlet valve 123 is opened, the control unit 150 may generate an alarm by determining that the sample water does not flow in, and the discharge valve 127 is measured after opening If the sample water of the unit 110 is not discharged, an alarm may be generated. The control unit 150 turns on the light emitting unit 111 in a state where the measuring unit 110 is empty, stores the amount of light measured by the light receiving unit 113, and determines whether to fill the water based on this. That is, when the amount of light is weaker than a certain amount, it is determined that the number of samples is filled. In addition, if the amount of light is weak for a certain amount or more even when the number of samples is empty, it is determined that the measuring unit 110 is contaminated.

Also, the control unit 150 may generate a control signal to repeat the opening/closing operation of the inlet valve 123 so that the reagent injected into the measuring unit 110 is well mixed.

In the embodiment of the present invention, the control unit 150 is simply composed of a PCB electronic circuit so that power consumption (usually, 2W or less) is small, and the operator must be able to access a configuration that displays a control screen and requires control operation. Molded explosion-proof structure, which is a closed structure, cannot be used, and it is preferable to have an intrinsically safe explosion-proof structure.

On the other hand, Figure 2 is a block diagram showing an explosion-proof residual chlorine concentration measuring apparatus according to another embodiment of the present invention. Descriptions of components having the same reference numerals as those of FIG. 1 will be omitted as they are the same as those of FIG. 1 .

In the embodiment shown in FIG. 2 , in the explosion-proof residual chlorine concentration measuring device 100 , the reagent injection device 200 , the inlet valve 123 and the outlet valve 127 are installed in a danger zone (Zone 0 or Zone 1) and , the first to fourth air control valves (173a, 173b, 175, 177) are installed in the safety zone (Zone 2).

That is, the explosion-proof residual chlorine concentration measuring device 100 according to the embodiment of FIG. 2 is located in the danger zone by arranging the first to fourth

air control valves

173a, 173b, 175, 177 in the safety zone and controlling the pressurized air. By configuring to control the pneumatic valve and reagent injection device 200 in the DPD type TRO sensor, it is possible to further reduce power consumption in the danger zone.

In this case, since the four air supply lines connected to the first to fourth

air control valves

173a, 173b, 175 and 177 are installed to be long, the air control valve is located inside the DPD type TRO sensor, compared to the embodiment of FIG. 1 . Although this may be complicated, since only the power consumption of the control unit 150 is required in the danger zone, power consumption can be remarkably reduced.

3 is a plan view showing a first embodiment of the reagent injection device provided in the explosion-proof residual chlorine concentration measuring device according to the present invention, and FIG. 4 is a side view of FIG. 3 showing a state before reagent injection, FIG. 3 is a side view illustrating a state after reagent injection, and FIG. 6 is a cross-sectional view of FIG. 5 .

3 to 6 , the reagent injection device 200 according to the embodiment of the present invention includes a housing 220 , a reagent inlet pipe 140 installed through the housing 220 , and a housing 120 . ) includes a pressurizing means 210 for pressurizing the reagent inlet pipe 140 inside.

An inlet 221 is provided on one side of the housing 220 so that the reagent inlet tube 140 is introduced into the housing 220 , and the reagent inlet tube 140 introduced into the housing 220 is connected to the housing 220 . ) The discharge part 225 is provided so as to be guided to the outside of the housing 220 again after extending from the inside.

In one embodiment of the present invention, the support part 223 is positioned between the inlet 221 and the outlet 225 inside the housing 220 to support the reagent inlet pipe 140 introduced into the housing 220 . ) is included.

The support part 223 may be formed integrally with the housing 220, but as shown in FIG. 6 , it is configured separately and provided with a height adjustment part therebetween so that the support part 223 can be raised and lowered in the vertical direction. desirable. In this configuration, the same reagent injection device 200 can be used for pipes 140 of various sizes. That is, by allowing the height adjustment unit to adjust the distance with the pressing means 210 , it is possible to generate all the necessary pressing forces for the pipes 140 of different sizes.

As an embodiment, the height adjustment unit includes the height adjustment bolt 228 disposed between the housing 220 and the support portion 223, and rotates the height adjustment bolt 228 in the first direction or the second direction by rotating the support portion ( 223) may be configured to raise or lower. In addition, guide pins 229 are spaced apart from each other on both sides of the height adjustment bolt 228 to guide the support 223 when ascending or descending so that the support 223 can move in parallel.

The reagent inlet pipe 140 is introduced into the housing 220 through the inlet 221 of the housing 220 , and extends along the support 223 from the inside of the housing 220 , and then the housing 220 is discharged. It is guided to the outside of the housing 220 through the portion 225 .

Here, in the reagent inlet pipe 140 , the fluid to be supplied in a fixed amount by being pressurized by the reagent injecting device 200 is located inside, and is pressurized and deformed by the pressurizing means 210 to transform the fluid into the reagent inlet pipe 140 . After being discharged to the discharge side of the reagent, it is preferable to be composed of an elastic material whose shape is restored so that the fluid can be introduced through the inlet side of the reagent inlet pipe 140 .

As another embodiment, only the portion pressed by the pressing means 210 of the reagent inlet tube 140 may be formed of an elastic material, and may be formed of a single reagent inlet tube 140 , but the reagent inlet tube 140 may be formed of a single reagent inlet tube 140 . ) and a separate pipe (not shown) made of an elastic material may be configured as a connection.

The reagent injection device 200 according to an embodiment of the present invention may configure the inlet side and the outlet side of the reagent inlet pipe 140 in various forms. For example, as shown in FIGS. 3 to 6 , the inlet side of the reagent inlet tube 140 is located below the reagent injection device 200 and the outlet side of the reagent inlet tube 140 is the reagent injection device 200 . may be located below the In another embodiment, as shown in FIGS. 7 and 8 , the inlet side of the reagent inlet pipe 140 may be positioned upward, and the outlet side of the reagent inlet pipe 140 may face rearward. Although not shown, various combinations are possible in which the inlet side of the reagent inlet pipe 140 is positioned upward or downward, and the outlet side of the reagent inlet pipe 140 is positioned upward/front/downward.

When the inlet side of the reagent inlet pipe 140 is located above or below the reagent injection device 200, the support 223 is formed to have a rounded corner in the direction of the inlet 221 of the housing 220 to introduce the reagent. After the tube 140 is introduced upward or downward through the inlet 221, the reagent inlet tube 140 has an appropriate curvature when it is guided to the support portion 223 formed in the horizontal direction after changing the direction by about 90 degrees. By changing the direction, it is possible to maintain the internal open state without clogging.

The pressurizing means 210 moves in the longitudinal direction of the reagent inlet tube 140 inside the housing 220 and pressurizes one side (the upper end in FIGS. 3 to 6) of the reagent inlet tube 140. A pressure roller 215 and , and a driving unit for moving the pressure roller 215 in the longitudinal direction of the reagent inlet pipe 140 .

* Here, the driving unit is configured to move the pressure roller 215 in a linear reciprocating motion in the longitudinal direction of the reagent inlet pipe 140, and in one embodiment of the present invention, one end of the connecting unit 214 is connected by the fastening unit 213b. It is connected to the pressure roller 215 through, and the other end is configured to include a piston rod 213 provided with a piston head 213a to be driven by pneumatic. The piston head 213a is inserted into the hollow portion 211a of the piston case 211 and is configured to perform a linear reciprocating motion by pneumatic pressure.

That is, by providing the housing 220 with

air injection units

217 and 218 for injecting air, respectively, on both sides of the piston head 213a and selectively controlling the first and second

air control valves

173a and 173b, the piston The head 213a can be driven left or right by pneumatic pressure.

As described above, the reagent injection device 200 according to an embodiment of the present invention has the advantage of being easy to apply to an explosion-proof structure by using a pneumatic piston as a driving unit instead of a pump using a motor.

On the other hand, inside the housing 220, there is a support portion 223 is installed as described above, at least a part of the support portion 223 is formed parallel to the reciprocating direction of the pressure roller 215 to the pressure roller 215. By this, the horizontal part 141 of the reagent inlet pipe 140 can be pressed on the support part 223 . For example, the support part 223 allows the reagent inlet pipe 140 to be constantly pressurized by the pressurizing means 210 by forming a flat upper outer circumferential surface except for the rounded portion.

The above-described height adjustment unit may be configured to vertically move the support portion 223 with respect to the reciprocating direction of the pressure roller 215 .

The reagent injection device 200 according to an embodiment of the present invention configured as described above is a device for supplying a fixed amount of fluid, wherein the amount of the supplied fluid depends on the length of the piston rod 213 constituting the pressurizing means 210 . can be determined by That is, the linear reciprocating distance is determined by the length of the piston rod 213, and a certain amount of fluid is supplied according to the linear reciprocating distance. In addition, the length of the support portion 223 is the length in which the lower end of the reagent inlet tube 140 contacts the support portion 223 when the pressure roller 215 reciprocates and pressurizes the reagent inlet tube 140 . Supply can be fixed. Alternatively, the amount of one injection may be adjusted according to the diameter or length of the reagent inlet tube 140 .

3 to 6, the inflow side of the reagent inlet pipe 140 is located below the reagent injection device 200, and in FIG. 4, the reagent inlet pipe 140 is moved by the pressure roller 215. It is a position where the pressurization starts, and FIG. 5 is a position where the reagent inlet pipe 140 is pressurized by the pressurizing roller 215, and the pressurizing roller 215 moves to the left to pressurize the fluid in the reagent inlet pipe 140, One injection will be completed.

As such, in one embodiment of the present invention, the pressure roller 215 is initially (located on the left side of the position in FIG. 4 ) located at the inlet 221 of the housing 220 so that the reagent inlet pipe 140 is pressurized. After the reagent fluid is filled in the reagent inlet pipe 140 in the non-reactive state, the pressure roller 215 is moved along the lengthwise direction of the reagent inlet pipe 140 to the outlet 225 of the housing 220, and a certain amount of liquid is configured to be injected.

3 to 6, when the inlet side of the reagent inlet pipe 140 is located below the reagent injection device 200, the pressure roller 215 returns to the initial position after one injection is completed. The mask reagent inlet pipe 140 is elastically restored, and the reagent fluid can be introduced again by generating a negative pressure in the reagent inlet pipe 140 .

7 is a side view showing a second embodiment of a reagent injection device provided in the explosion-proof residual chlorine concentration measuring device according to the present invention, and showing a state before reagent injection, and FIG. 8 is an explosion-proof residual chlorine concentration measuring device according to the present invention. It is a side view showing a second embodiment of the reagent injection device provided in the device, showing the state after the reagent injection. Hereinafter, another embodiment of the present invention will be described with reference to the drawings. Configurations having the same reference numerals as in the embodiment are identical configurations having the same functions, and descriptions thereof will be omitted and the different configurations will be mainly described.

Here, in the housing 220, the inlet 221 of the housing 220 is formed on the upper side so that the inlet side of the reagent inlet pipe 140 is located above the reagent injection device 200, and the outlet 225 is formed. is formed on the right side, and thus the support part 223 is also located above the reagent inlet pipe 140 .

On the other hand, a check valve 240 may be provided on the discharge side of the reagent inlet pipe 140 so that the liquid reagent does not flow back.

9 is a front view showing a state before and after the pressure roller provided in the reagent injection device according to an embodiment of the present invention pressurizes the pipe.

Figure 9a shows the flat outer circumferential surface of the pressurizing roller 215 before pressurizing the reagent inlet tube 140 having a circular cross section, and the fluid 250 to be injected is located in the reagent inlet tube 140 . At this time, the lower end of the pressure roller 215 forms a gap (G) between the inner peripheral surface of the lower end of the reagent inlet pipe (140).

Thereafter, as shown in FIG. 9B , the lower end of the pressure roller 215 completely presses the reagent inlet tube 140 so that the reagent inlet tube 140 is in a folded state. It may be positioned at the same height as the top of the tube 140 or lower. That is, the gap (G) is formed to be equal to or smaller than the thickness of the reagent inlet pipe 140, so that the pressurized state can be maintained.

As described above, the reagent injection device 200 according to the embodiment of the present invention includes a simple structure for pressing the reagent inlet tube 140 through the reciprocating motion of the piston rod 213, so that a fixed amount of liquid can be injected. there will be In addition, according to the present invention, the explosion-proof structure can be easily constructed by the pneumatically driven piston driving unit.

10 is a view showing a reagent storage unit and a measuring unit provided in the explosion-proof residual chlorine concentration measuring device according to the present invention.

Referring to FIG. 10 , the reagent storage unit 130 is installed at a higher position than the measurement unit 110 , and a reagent is injected into the measurement unit 110 by natural pressure.

The reagent storage unit 130 has a storage space formed therein to store reagents in a cylindrical shape, a body 131 having an opening on one side, and a lid ( 133).

Also, the reagent storage unit 130 may include an elastic tube 135 having one end connected to the lid 133 and the other end connected to the reagent inlet tube 140 .

Here, a support 137 may be included between the elastic tube 135 and the reagent inlet tube 140 .

The elastic tube 135 is connected through the connecting portion of the lid 133 and the support 137 so that the reagent can be injected through the elastic tube 135 .

The explosion-proof residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention can easily perform a reagent replacement operation through the spring-type elastic tube 135 as described above. That is, the reagent storage unit 130 is erected by connecting the elastic tube 135 to the lid 133 of the reagent storage unit 130 to replace the reagent, and then the reagent storage unit ( 130) maintains an inverted state by elasticity, and a reagent is supplied.

Meanwhile, the amount of reagent supplied from the reagent storage unit 130 is determined by adjusting the operation (pressurization) time of the reagent injection device 200 . In addition, since the reagent is pressurized by a natural pressure, the state filled in the reagent inlet pipe 140 is maintained.

11 is a graph showing the relative reactivity (Relative Responsivity) of the light receiving unit provided in the explosion-proof residual chlorine concentration measuring device according to the present invention.

Referring to FIG. 11 , the relative reactivity of the red, green, and blue regions varies depending on the wavelength. For example, in the red region, the relative reactivity increases at a wavelength of about 750 nm, and in the green region, the relative reactivity increases at a wavelength of about 560 nm. Able to know.

The measuring unit 110 of the present invention measures whether the sample water is filled using the RED area of the RGB sensor using the graph of FIG. 11, and the residual chlorine concentration of the sample water is the GREEN area of the RGB sensor can be measured using

That is, the measuring unit 110 turns on the light emitting unit 111 in an empty state, stores the amount of light measured in the RED (about 750 nm wavelength) region with the light receiving unit 113, and sets it as a reference value of whether to fill or not, and the measuring unit 110 In the state in which the water is filled, the reagent is put into the sample water, the light emitting unit 111 is turned on, and then the amount of light is measured using the green region (560 nm wavelength) of the light receiving unit 113 .

12 is a flowchart illustrating a method for measuring residual chlorine concentration according to the present invention. And, the residual chlorine concentration measuring method of the present invention uses the explosion-proof residual chlorine concentration measuring apparatus 100 disclosed in FIG.

1 and 12, in the method for measuring the residual chlorine concentration according to an embodiment of the present invention, first, the inlet valve 123 and the outlet valve 127 are opened to bypass the sample water (S110). The bypassed sample water washes the sample water inlet pipe 121 , the sample water outlet pipe 125 , and the sample water inlet space of the measuring unit 110 .

Next, the discharge valve 127 is closed to fill the measurement unit 110 with sample water (S120). Whether the number of samples is filled or not is determined by turning on the light emitting unit 111 and then measuring the amount of light from the light receiving unit 113 . When the sample water of a predetermined capacity is filled, the inlet valve 123 is closed.

Then, a reference point is set by measuring the absorbance of the sample water without injecting a reagent into the filled sample water (S130). This reference point becomes the reference absorbance.

Thereafter, the discharge valve 127 is opened to discharge the sample number for which the reference absorbance measurement is completed from the measurement unit 110 , and after the discharge is completed, the discharge valve 127 is closed to inject a new sample number into the measurement unit 110 . do (S140).

At this time, in order to confirm the completion of discharge of the sample water, the absorbance is measured by the measurement unit 110. Even after the discharge is confirmed, the discharge valve 127 is left open for a few more seconds and then closed, so that the number of samples is more reliable. to be expelled. Through this operation, it is possible to reduce the measurement error.

In addition, when a new sample number is injected into the measurement unit 110 in the sample number replacement step ( S140 ), the inlet valve 123 is opened to fill the sample number. Whether the number of samples is filled is determined by the measurement unit 110 Check the absorbance. Then, when the sample water is filled, the opening/closing of the inlet valve 123 is repeatedly operated. For example, it is opened for about 0.5 seconds and then closed for about 0.5 seconds so that the sample water flows into the measuring unit 110 while forming a vortex. Through this operation, the incoming reagents are well mixed.

Next, a reagent is injected into the replaced sample water (S150), and the color absorbance is measured in the measurement unit 110 (S160).

Here, in the step of injecting the reagent (S150), the reagent injection device ( 200) to be operated for a short time, the reagent is well mixed in the measuring unit 110 while forming a vortex.

Thereafter, the control unit 150 converts the residual chlorine concentration based on the measured reference absorbance and color absorbance ( S170 ). In other words, when measuring the standard absorbance, measure the amount of light in the sample water without reagent added. When measuring the color absorbance, measure the light amount in the sample water in which the reagent is injected to find the difference in light amount, and then use an appropriate conversion formula. Convert to residual chlorine concentration. As an example of the conversion formula, multiplying the difference in light intensity by the value a gives the residual chlorine concentration. all. After mixing the reagents, since the sample water develops color, light absorption power is generated, and the light quantity value measured by the light receiving unit 113 is weakened. If there is no color development after mixing the reagent, the same amount of light as the reference amount is measured, and there is no difference, so the residual chlorine concentration becomes 0.

Next, the sample water for which the measurement of the residual chlorine concentration is completed is discharged while the discharge valve 127 is opened (S180).

Thereafter, the repeating operation is performed again from the step (S110) of bypassing the sample water in order to measure the residual chlorine concentration in the new sample water.

As described above, in the explosion-proof residual chlorine concentration measuring device 100 according to an embodiment of the present invention, the control unit 150 has an intrinsically safe explosion-proof structure, and the inlet valve 123 , the outlet valve 127 , and the reagent injection device By operating 200 as the air control valve 170, the explosion-proof residual chlorine concentration measuring device 100 can satisfy the intrinsically safe explosion-proof structure as a whole.

In addition, the reagent injection device 200 operated by air pressure can prevent backflow of the liquid reagent by blocking 100% of both directions without a separate check valve, and has excellent durability.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications, changes and substitutions within the scope without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims

a measuring unit having a light emitting unit and a light receiving unit, and having a sample water inlet pipe through which the sample water flows in and a sample water outlet pipe through which the measured sample water is discharged;

a reagent storage unit provided with a reagent inlet tube to introduce a reagent into the measurement unit;

a control unit for measuring the concentration of an oxidizing agent in the sample water based on a signal received from the light receiving unit after the light generated by the light emitting unit passes through the sample number;

an inlet valve and a discharge valve installed in the sample water inlet pipe and the sample water outlet pipe, respectively, and composed of a pneumatic valve; and

A reagent injection device installed in the reagent inlet tube to control the inflow of the reagent; including,

The reagent inlet pipe includes at least an elastic pipe made of an elastic material,

The reagent injection device is driven by air and configured to pressurize the elastic pipe, an explosion-proof type residual chlorine concentration measuring device.
The method according to claim 1,

Explosion-proof residual chlorine concentration measuring device,

Explosion-proof type residual chlorine concentration measuring device, further comprising an air control valve for receiving a signal from the control unit for driving the inlet valve, the outlet valve and the reagent injection device.
3. The method according to claim 2,

The reagent injection device,

a housing having an inlet and an outlet connected to the reagent inlet, respectively, and having an elastic pipe connecting the inlet and the outlet therein;

a pressure roller that moves in the longitudinal direction of the elastic pipe inside the housing and presses one side of the elastic pipe; and

A drive unit for moving the pressure roller in the longitudinal direction of the elastic pipe with the air supplied by the air control valve; including, an explosion-proof residual chlorine concentration measuring device.
4. The method according to claim 3,

drive unit,

Move the pressure roller to make a linear reciprocating motion in the longitudinal direction of the elastic pipe,

Inside the housing,

An explosion-proof residual chlorine concentration measuring device, at least a portion of which is parallel to the reciprocating direction of the pressure roller, and provided with a support part having a rounded corner in the direction of the housing inlet.
5. The method according to claim 4,

In the housing,

Explosion-proof type residual chlorine concentration measuring device provided with a height adjustment unit for vertically moving the support portion with respect to the reciprocating movement direction of the pressure roller.
4. The method according to claim 3,

A plurality of reagent storage units are provided,

A plurality of pressure rollers are provided to correspond to the reagent storage unit, respectively, and an explosion-proof residual chlorine concentration measuring device.
3. The method according to claim 2,

The pneumatic valve is installed in a hazardous area,

The air control valve is an explosion-proof residual chlorine concentration measuring device installed in a safe or hazardous area.
The method according to claim 1,

It includes;

The reagent storage unit,

An explosion-proof residual chlorine concentration measuring device that is installed at a higher position than the measuring part so that the reagent is injected into the measuring part by natural pressure.
9. The method of claim 8,

The reagent storage unit,

a body having a storage space formed therein to store reagents, and having an opening on one side;

a lid installed to be openable and openable in the opening of the body; and

One end is connected to the lid, the other end is an elastic tube connected to the reagent inlet pipe; Containing, explosion-proof residual chlorine concentration measuring device.
The method according to claim 1,

the control unit,

An explosion-proof residual chlorine concentration measuring device composed of an intrinsically safe explosion-proof structure.