JPH0755682A - Liquid concentration detecting device - Google Patents

Abstract

PURPOSE:To provide a liquid concentration detecting device which eliminates the need for measuring the volume of a solvent and can automate regulation of concentration. CONSTITUTION:To control the concentration of a solvent to a higher target concentration, a pair of floats 4a, 4b, put in the internal passage 3 of an elevating passage forming member 1, each of which freely rises and falls, has different specific gravity, so that the float 4a floats on the surface of a liquid for detection until the target concentration is reached, while the float 4b sinks. Near the target concentration, the float 4b starts floating, and abuts to the float 4a at the target concentration. A contact detection means 6 detects the abutting and determines that the target concentration has been reached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid concentration detecting device used when a solution is added to a solvent to adjust the concentration to a specified value.

[0002]

2. Description of the Related Art As shown in FIG. 6, when an attempt is made to add a required amount of a solution B to a solvent A to prepare a solution S having a target concentration, conventionally, the specific gravity a and volume of the solvent A, and the solution The required amount of the solution B is calculated based on the specific gravity b of B, and the solution B is added to the solvent A. Alternatively, a specific gravity meter is introduced without obtaining the volume of the solvent A, and the solution B is added until the specific gravity s of the target concentration is reached.

[0003]

In the method using a hydrometer, it is not necessary to measure the volume of the solvent A, but an operator adds the solution B while visually observing the scale of the hydrometer and supplies the solution B. At present, it is necessary to adjust the amount and cannot be automated.

An object of the present invention is to provide a liquid concentration detecting device which does not require measurement of the volume of the solvent A and which can automatically adjust the concentration.

[0005]

According to a first aspect of the present invention, there is provided a liquid concentration detecting device, wherein an ascending / descending passage forming member into which a liquid to be detected flows into an internal passage, and an ascending / descending member which is placed in the internal passage of the ascending / descending passage forming member. It is characterized in that a pair of floats having different specific gravities and whose specific gravities are adjusted according to the target concentration of the liquid to be detected, and a contact detecting means for detecting that the pair of floats are in contact with each other are provided.

According to a second aspect of the liquid concentration detecting apparatus of the present invention, an ascending / descending passage forming member into which the liquid to be detected flows into an internal passage, and an internal passage of the ascending / descending passage forming member are vertically movable and have a target concentration of the liquid to be detected. A single float whose specific gravity is adjusted according to the above, and a float detecting means for detecting that the float has moved to a prescribed position of the internal passage are provided.

[0007]

According to the structure described in claim 1, when adjusting the concentration of the solvent to a higher target concentration, the pair of floats that can be moved up and down by being inserted into the inner passage of the elevating passage forming member have specific gravity. Since they are different, one float floats on the liquid surface of the liquid to be detected and the other float sinks until the liquid to be detected reaches the target concentration. When the liquid to be detected approaches the target concentration, the other float starts to float, and when the liquid to be detected reaches the target concentration, the other float comes into contact with the one float. The contact detection means detects this contact and determines that the liquid to be detected has a specified concentration.

When the solvent concentration is adjusted to a lower target concentration, one float floats on the liquid surface of the liquid to be detected and the other float sinks until the liquid to be detected reaches the target concentration. When the liquid to be detected approaches the target concentration, the one float starts to sink, and when the liquid to be detected reaches the target concentration, the one float contacts the other float.
The contact detection means detects this contact and determines that the liquid to be detected has a specified concentration.

Therefore, the equipment can be automated by stopping the supply of the liquid added to the solvent by using the output of the contact detection means. According to the configuration of the second aspect, when the solvent reaches the target concentration, the float arrives at the specified position of the ascending / descending path forming member, and the float detection unit detects this and determines that the liquid to be detected has the specified concentration. Therefore, the equipment can be automated by stopping the supply of the liquid added to the solvent by using the output of the float detecting means.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show a first embodiment of the present invention. The lift passage forming member 1 soaked in the solvent A has holes 2 at the bottom and the top, and the solvent A flows into the internal passage 3. A pair of floats 4a and 4b are placed in the internal passage 3 of the up-and-down passage forming member 1.
The diameters of a and 4b are slightly smaller than the inner diameter of the internal passage 3. The surfaces of the floats 4a and 4b are electrically conductive, and a flexible lead wire 5a introduced from the upper portion of the hoistway forming member 1 is attached to the float 4a. Float 4b
A flexible lead wire 5b introduced from the bottom of the up-and-down passage forming member 1 is attached to the. The lead wires 5a and 5b drawn out of the up-and-down passage forming member 1 are connected to a control unit 6 as a contact detecting means. The controller 6 is connected with a switch 7 for instructing the start of operation, a pump 8 for sucking the solution B, and a lamp 9 for notifying that the target concentration has been reached. Reference numerals 10 and 11 are a motor and a stirring blade for stirring the solvent A.

The specific gravities of the floats 4a and 4b are different from each other, and the specific gravities are adjusted according to the target concentration of the liquid to be detected. The operation of the liquid concentration detecting device will be described by dividing the operation into the following two cases.

When the specific gravity of the solvent A is adjusted to a higher concentration When the specific gravity of the solvent A is adjusted to a lower concentration In the following description, the specific gravity of the solvent A is b, the specific gravity of the solution B is b, and the target is It is assumed that the specific gravity of the solution S when the concentration is reached is s, the specific gravity of the float 4a is Fa, and the specific gravity of the float 4b is Fb.

[When adjusting the specific gravity of the solvent A to a higher concentration] "Specific gravity a <specific gravity b" and floats 4a and 4b satisfying the following relationship are prepared.

Specific gravity s = specific gravity Fa> specific gravity Fb With such a configuration, the float 4a as shown in FIG.
Is floating and the float 4b is sinking. When the switch 7 is operated, the controller 6 starts the operation of the pump 8 and the solution B is poured into the solvent A. When the concentration of the solvent A approaches the target concentration, the float 4b rises and the concentration of the solvent A reaches the target concentration, as shown by the phantom line in FIG.
Comes into contact with the float 4a. The control unit 6 causes the floats 4a and 4b to be connected to each other by the conduction between the lead wires 5a and 5b.
Is detected, and the operation of the pump 8 is stopped,
The lamp 9 is turned on to notify the operator.

[When the Specific Gravity of the Solvent A is Prepared to a Lower Concentration] "Floor density a> specific gravity b" and floats 4a and 4b satisfying the following relationship are prepared.

Specific gravity s = specific gravity Fb> specific gravity Fa With this construction, as shown in FIG. 2, the float 4a
Is floating and the float 4b is sinking. When the switch 7 is operated, the controller 6 starts the operation of the pump 8 and the solution B is poured into the solvent A. When the concentration of the solvent A approaches the target concentration, the float 4a sinks, and when the concentration of the solvent A reaches the target concentration, the float 4a contacts the float 4b as shown by the phantom line in FIG. The controller 6 uses the lead wire 5
The contact between the float 4a and the float 4b is detected by the conduction between the a and 5b, the operation of the pump 8 is stopped, and the lamp 9 is turned on to notify the operator.

The lifting passage forming member 1 is a float 4
The stirring blade 11 is regulated while restricting the ascending and descending paths of a and 4b.
This helps prevent the influence of vortices generated by the action from acting on the floats 4a and 4b.

In the above embodiment, the floats 4a and 4b were set in the internal passage 3 of the lifting passage forming member 1, but
As shown in FIGS. 3 and 4, one float 4c is set, the fixed electrode 12a or the fixed electrode 12b is attached to a prescribed position of the internal passage 3 of the ascending / descending passage forming member 1, and conduction between the float 4c and the fixed electrode 12a is established. The same effect can be expected by controlling the operation of the pump 8 by detecting the control of the pump 8 or controlling the operation of the pump 8 by detecting the conduction between the float 4c and the fixed electrode 12b. it can.

Further, as shown in FIG. 5, the fixed electrode 12a and the fixed electrode 12b are attached to a prescribed position of the internal passage 3 of the ascending / descending passage forming member 1, and the float 4c and the fixed electrode 12a,
12b and the control unit 6 are connected by lead wires 5a, 5b, 5c, and the control unit 6 detects the conduction between the float 4c and the fixed electrode 12a to control the operation of the pump 8 or fix the float 4c. The same effect can be expected by detecting the conduction between the electrodes 12b by the control unit 6 and controlling the operation of the pump 8.

[0020]

According to the liquid concentration detecting device of claim 1,
A lift passage forming member through which the liquid to be detected flows into the inner passage,
The pair of floats, which are placed in the internal passage of the lifting passage forming member and can be raised and lowered, have different specific gravities and whose specific gravities are adjusted according to the target concentration of the liquid to be detected, and the pair of floats contact each other. Since contact detection means for detection is provided, it can be used in both cases of adjusting the concentration of the solvent to a higher target concentration and a lower target concentration, and supplying a liquid to be added to the solvent. Equipment can be automated by stopping.

According to the second aspect of the present invention, the ascending / descending passage forming member into which the liquid to be detected flows into the internal passage and the internal passage of the ascending / descending passage forming member can be moved up and down to reach the target concentration of the liquid to be detected. Since the single float whose specific gravity is adjusted accordingly and the float detecting means for detecting that the float has moved to the specified position of the internal passage are provided, the concentration of the solvent is adjusted to a higher target concentration. It can be used in the case of preparing a target concentration of low concentration, and the equipment can be automated by stopping the supply of the liquid added to the solvent.

[Brief description of drawings]

FIG. 1 shows a liquid concentration detecting device according to a first embodiment of the present invention,
It is explanatory drawing at the time of adjusting to high concentration.

FIG. 2 is an explanatory diagram of a low concentration prepared in the first embodiment.

FIG. 3 is an explanatory diagram in the case of adjusting to a low concentration with the liquid concentration detecting device of the second embodiment.

FIG. 4 is an explanatory diagram of a high concentration prepared in the second embodiment.

FIG. 5 is an explanatory diagram of a liquid concentration detecting device according to a third embodiment.

FIG. 6 is an explanatory diagram of work contents.

[Explanation of symbols]

 1 Elevating Passage Forming Member 3 Internal Passage 4a, 4b, 4c Float 5a, 5b, 5c Lead Wire 6 Control Section [Contact Detection Means]

Claims (3)

[Claims] 1. An elevating passage forming member into which a liquid to be detected flows into an internal passage, and an elevating passage forming member that can be moved up and down and have different specific gravities depending on a target concentration of the liquid to be detected. Is provided with a pair of floats adjusted, and contact detection means for detecting the contact of the pair of floats with each other, and the contact detection means detects the contact of the float and the liquid to be detected has a prescribed concentration. Liquid concentration detection device for determination. 2. An elevating passage forming member into which a liquid to be detected flows into an internal passage, and a single member which is placed in the internal passage of the elevating passage forming member and is vertically movable and whose specific gravity is adjusted according to a target concentration of the liquid to be detected. A float and a float detecting means for detecting that the float has moved to a specified position of the internal passage, and the float detecting means detects the float and determines that the liquid to be detected has a specified concentration. Detection device. 3. An elevating passage forming member into which a liquid to be detected flows into an internal passage, and a single unit having a specific gravity adjusted according to a target concentration of the liquid to be detected by being inserted into the internal passage of the elevating passage forming member. A liquid concentration detecting device comprising one float and float detecting means for detecting that the float has moved to a target prescribed position among a plurality of prescribed positions of the internal passage.