JPH07270214A - Method and device for detecting salt water level and salt water concentration in salt water tank of water softener - Google Patents

Abstract

PURPOSE:To detect surely the salt water level and the salt water concentration in a salt water tank, which contains the salt water used in regeneration of ion exchange resin, with a simple constitution. CONSTITUTION:A salt water tank 13 is connected to a processing container 11, which contains ion exchange resin for removing the hardness portion of raw water, contains the salt water to be supplied for the regeneration of the capability of the ion exchange resin and supplies the raw water after the supply of the salt water. The change in liquid pressure in the salt water tank 13 is detected at the position lower than the lower-limit position of the water-level fluctuation in the salt water tank 13. Whether the water level in the salt water tank reaches a preset reference water level or not, is detected at the same time. The water level and the concentration of the salt in the salt water tank 1 are obtained by an operation processor 20 based on the change in salt water pressure. At the time of the reaching the reference water level, the water level obtained by the operation processor 20 is calibrated to the reference water level. At the same time, the salt water concentration obtained by the operation processor 20 is calibrated based on the detected pressure value at this time point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salt water tank for storing reclaimed salt water of a water softener for softening raw water containing hardness, and more specifically to a salt water level and a salt water level in the salt water tank. The present invention relates to a method and apparatus for detecting a concentration and automatically calibrating a detected value.

[0002]

As is well known, a water softener obtains soft water by removing hardness contained in raw water.
Generally, an ion exchange resin is used. In such a water softener, the total removal amount of hardness is a fixed amount determined by the type and amount of the ion exchange resin (generally this amount is called the resin capacity). Therefore, if the water softening treatment by the water softener is continued, the hardness component cannot be finally removed. Therefore, before that, salt water is allowed to act to recover the resin ability (generally called regeneration). There is a need.

In recent years, automatic water softeners configured to alternately repeat the water softening treatment of the raw water and the regeneration treatment of the ion exchange resin as described above have been widely used, and such an automatic water softener is used. In, a treatment container containing an ion exchange resin, a control valve for automatically switching the flow path for water softening treatment and regeneration treatment, and a salt water tank for storing salt water for regenerating the ion exchange resin are provided. ing.

At the time of regeneration, the control valve is connected to the flow channel at the time of regeneration so as to introduce the salt water for regeneration from the salt water tank into the processing container, and thereafter to generate the salt water used for the next regeneration. First, the raw water is supplied to the predetermined water level in the salt water tank (replenishing water), and a large amount of the pre-added regenerating salt is dissolved to create a high-concentration salt water. In addition, the salt water concentration at this time is obtained by dissolving the salt water diluted after the raw water replenishment at room temperature until the next regeneration treatment with a large amount of salt that has been previously put into the salt water tank. In addition, until the next regeneration, it is obtained by dissolving by being left in a standing state, so that the saturated concentration is not completely achieved, but it is usually 20% by weight or more. In addition, salt water with such a high concentration may be directly introduced into the processing container, but in a normal water softener, this ejected salt water is sucked by the fluid pressure of the raw water using an ejector, and the salt water is discharged together with the raw water. Since the salt water is actually introduced, the concentration of the salt water actually flowing into the processing container is diluted, but it is preferable to secure the salt water concentration of 10% by weight or more at this point.

[0005]

As described above, in the conventional water softener, assuming that the salt water used for regeneration has a substantially saturated concentration, the salt water is allowed to act on the resin in a predetermined amount. There is. Regarding the control of the introduced amount of salt water and the replenishment amount, generally, the upper limit position of the water level in the salt water tank for regeneration is set by a float valve, and the lower limit position of the water level is set by the intake port of salt water, the upper limit position and the lower limit position. There are two points, which are performed by providing a water level detector such as a float switch or an electrode type, and an upper limit position is performed by a float valve, and a lower limit position is performed by providing the water level detector. When the detection water level is changed in order to supply the salt water amount according to the capacity of the ion exchange resin in the container, the adjustment is complicated and there is a problem that the applicability is low. In addition, in the case where the salt water is supplied by detecting the upper limit position and the lower limit position in the salt water tank as described above, there is also a problem that a fixed amount of salt water cannot be supplied because the water level changes due to the dissolution of the regeneration salt. is there.

Further, when the amount of the added salt is insufficient, the regenerated salt at the time of addition dissolves so as to form a cavity inside while maintaining the outer shape, and when a so-called salt bridge is formed, the regenerated salt is If the salt dissolution rate changes due to the residual amount, temperature, or tank shape (size or shape), the salt water concentration does not reach the concentration required for regeneration of the ion exchange resin. In the regeneration system in which the salt water of a predetermined water level in the salt water tank is applied regardless of the concentration, the regeneration of the resin ability is caused poorly, and the softening treatment is performed without completely regenerating the ability. Then, the resin capacity is saturated before the next regeneration time arrives, causing a problem that the hardness leaks to the equipment used downstream. In order to prevent this problem, it is necessary to monitor the salt water concentration in the salt water tank, and conventionally, an electrode-type concentration detector that determines the salt water concentration from the electrical conductivity of salt water has been generally used. In such an electrode-type concentration detector, the error of the measured value is large in the high-concentration salt water as described above, and the electric conductivity is greatly affected by temperature, so the measured value is inaccurate. It has become a thing.

That is, the problem to be solved by the present invention is to supply a necessary amount of salt water having a concentration necessary for the regeneration of the ion exchange resin, and to store the salt water for reliable regeneration and prevention of wasting of salt. To reliably detect the salt water level and salt water concentration in the salt water tank with a simple configuration.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a detection method therefor is a processing container containing an ion exchange resin for removing a hardness component in raw water. Connected to the salt water tank that stores the salt water supplied for the regeneration of the capacity of the ion exchange resin and replenishes the raw water after the salt water is supplied, the salt water pressure is lower than the lower limit position of the water level fluctuation in the salt water tank. In addition to detecting the change in the liquid pressure of the salt water, it also detects whether the water level in the salt water tank has reached a preset reference water level, and calculates the water level and concentration of the salt water in the salt water tank based on the change in the salt water pressure. Along with the processing, the salt water level obtained by the arithmetic processing is calibrated to the reference water level when the arrival detection signal to the reference water level is detected, and the salt water obtained by the arithmetic processing is also calibrated. It is characterized in that it has a degree such that the calibration based on the detected pressure value at this point.

Further, the detecting device is connected to a processing container containing an ion exchange resin for removing the hardness component in the raw water, and salt water supplied for recovering the capacity of the ion exchange resin is used. After accommodating and supplying the salt water, in the salt water tank that replenishes the raw water, the salt water pressure detector for detecting the change in the salt water pressure at the position below the lower limit position of the water level fluctuation in the salt water tank, and the salt water tank A reference water level detector for detecting whether or not the water level has reached a preset reference water level at an appropriate position within the water level fluctuation range, and a salt water tank based on a change in the salt water pressure detected by the salt water pressure detector. While calculating the water level and concentration of salt water in the inside, at the time of detecting the arrival detection signal to the reference water level of salt water from the reference water level detector,
It is characterized by comprising an arithmetic processing unit for calibrating the salt water level obtained by the arithmetic processing to a reference water level and calibrating the salt water concentration obtained by the arithmetic processing based on the detected pressure value at this point. is there.

[0010]

According to the method of detecting the salt water level and the salt water concentration in the salt water tank of the water softener according to the present invention, the salt water tank
Change of water level due to supply of salt water from (13) to treatment vessel (11), change of water level due to replenishment of raw water into salt water tank (13), change of specific gravity due to dissolution of regenerating salt in salt water tank after replenishment and water level The change is detected as a change in hydraulic pressure at a position below the lower limit position of the water level fluctuation in the salt water tank (13), and the water level and concentration of the salt water in the salt water tank (13) are calculated based on the pressure change of the salt water. Obtained by processing. Then, it is detected whether or not the water level in the salt water tank (13) has reached a preset reference water level, and at the time when the arrival detection signal to the reference water level is detected, the salt water level obtained by the arithmetic processing is set to the reference water level. The salt water concentration obtained by the calculation process is calibrated based on the detected pressure value at this time, so that the accurate salt water level and the salt water concentration are always detected.

According to the salt water level and salt water concentration detecting device in the salt water tank of the water softener according to the present invention,
Water level change due to salt water supply from the salt water tank (13) to the treatment vessel (11), water level change due to replenishment of raw water into the salt water tank (13), change in specific gravity due to dissolution of regenerating salt in the salt water tank after water replenishment Also, the water level change is detected as a change in the liquid pressure in the salt water tank (13) by the salt water pressure detector (21) at a position below the lower limit position of the water level fluctuation in the salt water tank (13), and this detection signal is detected. Output to the arithmetic processing unit (20). The arithmetic processing unit (20) which has received the detection signal of the salt water pressure from the salt water pressure detector (21), the salt water tank by the arithmetic processing based on the change of the salt water pressure detected by the salt water pressure detector (21) ( Calculate the water level and concentration of salt water in 13) by calculation processing. Then, the reference water level detector is added to the arithmetic processing unit (20).
(22), when the arrival detection signal to the reference level of salt water is input, the salt water level obtained by the calculation process is calibrated to the reference water level and the salt water concentration obtained by the calculation process is detected at this point. By calibrating based on the pressure value, accurate salt water level and salt water concentration are always detected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 exemplifies a configuration of a water softener provided with a device for detecting the water level and concentration of salt water according to the present invention, and a normal water softening treatment operation of the water softener and a configuration related to a regenerating operation are shown. It is omitted and only the basic structure necessary for explaining the present invention is shown. FIG. 2 is a diagram showing the relationship between elapsed time and salt water pressure for explaining the principle of detecting the water level and concentration of salt water in the present invention.

In FIG. 1, a water softener (10) comprises a treatment container (11) containing an ion exchange resin, and a control valve (12) for switching between water softening treatment operation and regeneration operation of the water softener (10). ), And a salt water tank (13) that stores salt water for regeneration,
It has a control device (17) for switching the control valve to a predetermined operating state by a signal from various detectors and a built-in timer as will be described later.

In this embodiment, the control valve (12) is attached to the upper part of the processing container (11), and the control unit (17) controls the flow paths inside the water softener (10) and the water softener (10). )), The raw water line (1) for supplying raw water to the water softener, the treated water line (2) for supplying the treated liquid after the water softening treatment to subsequent demand points, and the salt water. Tank (1
3), and selectively switches between the salt water line (14) for introducing and replenishing salt water, and the drain discharge line (3) for draining water from the processing container during regeneration, and a water softener
The water softening treatment operation (10) and the regeneration operation are switched.

The inside of the salt water tank (13) is partitioned by a partition member (15) capable of holding a salt for regeneration (16) without impeding the flow of water such as a net or a perforated plate. Element
Regeneration salt (generally in the form of lumps of appropriate size) (16) is fed onto (15). The regenerating salt (16) supplied while being retained on the partition member (15) is the partition member (16) during the replenishment of the raw water supplied through the salt water line (14) after the ion exchange resin regeneration. 15) It is dissolved in raw water by replenishing water to a position higher than 15), and salt water of a high concentration close to the specified concentration, that is, the saturated concentration as described above is generated.

As is well known, the control device (17) is for detecting various detectors, for example, a flow rate detector for detecting the amount of raw water (or treated water) passing through, and a detector for detecting the supply pressure of raw water. The operating conditions of the water softener are grasped from various detectors such as the raw water supply pressure detector, and the control valve (12) is switched to a predetermined operating state (switching to water softening treatment and regeneration operation, etc.) and a built-in timer Control is performed so as to maintain various operating states of the water softener (such as the water softening treatment and the cleaning operation by introducing raw water during the regeneration operation) for a predetermined time based on the set value in (not shown).

In the present invention, the salt water tank (1
3) The change in the hydraulic pressure in the salt water is detected, and the water level and concentration of the salt water in the salt water tank (13) are calculated based on the change in the salt water pressure, and the water level in the salt water tank (13) is set in advance. It is designed to calibrate the salt water level obtained by the above calculation process to the reference water level when the arrival detection signal to the reference water level is detected by detecting whether or not the salt water pressure is detected. Device (21), reference water level detector
(22) and an arithmetic processing unit (20) for arithmetically processing the signals from these detectors.

The salt water pressure detector (21) includes a salt water tank (1
It is mounted near the bottom of 3) and detects the liquid pressure from the salt water level in the salt water tank (13) to the salt water pressure detection device (21) and outputs the detected value to the arithmetic processing unit (20). Incidentally, the mounting position of the salt water pressure detector (21) may be lower than the water level (lower limit position) after the salt water is supplied into the processing container (11), preferably the salt water pressure detector (21). By arranging the pressure detecting portion at a position where it is constantly submerged in the salt water, the pressure of the salt water can always be reliably detected.

The reference water level detector (22) is a salt water tank (1
Within the water level fluctuation range in 3), that is, has the preset reference water level been reached at an appropriate position between the upper limit position before salt water supply (or after replenishment) and the lower limit position after salt water supply? This is a container for detecting salt water in the salt water tank (13).
Water level that drops when supplying to (11) or salt water tank
When the water level rising when replenishing the raw water in (13) reaches the reference water level, the arrival detection signal is output to the arithmetic processing unit (20). As the reference water level detector (22), for example, a well-known water level detector such as a float switch that issues a detection signal when a predetermined water level is reached, or one using an electrode type water level detection end is used. When mounting, the detection position of the water level is set to the reference water level.

The arithmetic processing unit (20) calculates the water level and concentration of salt water in the salt water tank (13) based on the change in salt water pressure detected by the salt water pressure detector (21), and When the arrival detection signal from the reference water level detector (22) to the reference water level of the salt water is detected, the salt water level obtained by the calculation process is calibrated to the reference water level. And a calculation processing function for calibrating the water level and the concentration calculated by the calculation processing.

Regarding the former calculation processing function for obtaining the water level and the concentration, the water level change due to the salt water supply from the salt water tank (13) to the processing container (11) from the detected value of the salt water pressure from the salt water pressure detector (21). , The water level change due to the replenishment of raw water into the salt water tank (13), the specific gravity change due to the dissolution of the regenerating salt in the salt water tank after the water replenishment, and the water level change,
The contents of this arithmetic processing will be described with reference to FIG.

First, in a state in which salt water having a predetermined water level and a concentration close to the saturated concentration is stored in the salt water tank (13) after a predetermined time has elapsed since the previous replenishment (area A in the figure). Has almost no change in the detected pressure value a. Therefore, the water level of the salt water in this case is calculated from the detected pressure value a by calculating the specific gravity of the salt water based on the specified concentration.

Then, in the state where the water softener (10) shifts to the regenerating operation by the action of the control valve (12) (region B in the figure), the salt water in the salt water tank (13) passes through the salt water line (14). A predetermined amount is supplied into the processing container (11), the water level in the salt water tank (13) decreases according to the supply amount of salt water, and the detected pressure value also decreases from a to b with the decrease in the water level. . Since the concentration of the salt water in this case is the same as that of the region A, the amount of decrease in the water level is calculated by the calculation process from the specific gravity and the difference between the detected pressure value a and the detected pressure value b as in the above.

Next, when the supply of the salt water into the processing container (11) is completed and the control valve (12) operates to shift to the water replenishing operation (region C in the figure), the raw water is the salt water line.
A predetermined amount is supplied to the salt water tank (13) via (14), the water level of the salt water rises in accordance with this supply amount, and the detected pressure value also increases from b to c with the rise of the water level. When the water level reaches c, it is detected that the water level reaches a predetermined level by replenishing water.
At this time, the time required for replenishing water is short, and the replenishing time after the salt water level reaches the regenerating salt is even shorter, so the regenerating salt hardly dissolves, and immediately after the start of replenishing water. The salt water concentration of is the same as that of the regions A and B.
Therefore, the salt water at the time of completion of the replenishment is a state in which salt water having a concentration close to the saturation concentration before the start of replenishment is diluted with the raw water at the time of replenishment, and the salt water tank before the start of replenishment.
It can be easily calculated based on the specific gravity of the salt water obtained from the amount of salt water remaining in (13) and the amount of replenished water. In this calculation process, the amount of salt water remaining in the salt water tank before the start of replenishing water may be set in the calculation processing device (20) in advance by design or experimentally, and the detection may be performed. Pressure c
Also, the arithmetic processing unit is obtained in advance by design or experimentally.
Set it to (20).

Next, when the supply of raw water (replenishment) to the salt water tank (13) is completed and the state is changed to the standby state until the next regeneration (area D in the figure), the salt water tank (13) Since the salt water in a diluted state therein dissolves the regenerating salt (16) previously charged in large amounts on the partition member (15) and increases its specific gravity, the detected pressure value increases from c to d. The dissolution of the salt for regeneration (16) at this time is carried out slowly at room temperature, and because it is placed in a stationary state, the concentration of salt water gradually increases to a concentration corresponding to the saturation concentration. After reaching, there is almost no change. Therefore, the detected pressure value immediately after replenishing water gradually increases, and when the pressure d is reached, it is detected that the predetermined salt water concentration is reached. In this region D, if the detected pressure does not reach the pressure d by the next regeneration start, it is determined that the salt water concentration is lower than the specified concentration. In this case, the arithmetic processing unit (20) issues a control signal to the control valve (12) so as not to shift to the regenerating operation, and also issues an alarm notifying the lack of salt water concentration by a well-known informing means. Preferably. The amount of the salt for regeneration that dissolves after the completion of the water replenishment in this calculation process may be set in the calculation processing device (20) in advance by design or experimentally. The pressure d may also be obtained in advance by design or experimentally and set in the arithmetic processing unit (20). After that, since the salt water in the salt water tank (13) is almost saturated, the change in the specific gravity of the salt water, that is,
There is no change in the detected pressure value, and the pressures d and a have substantially the same value.

As described above, according to the present invention, since the salt water pressure detector (21) detects the pressure change of the salt water in the salt water tank (13), the salt water level and the salt water concentration can be reliably detected. Even when changing the capacity of the salt water tank (13) or the amount of salt water to be supplied, the processing content in the arithmetic processing unit (20), for example, only by modifying the coefficient when arithmetically processing the water level etc. from the detected pressure, the same. Since it can be dealt with by the component parts of, the adjustment is easy and the versatility is excellent.

Regarding the latter arithmetic processing function for calibrating the water level and the concentration obtained by the arithmetic processing,
(20), by receiving the arrival signal to the reference water level of the salt water level from the reference water level detector (22), by calibrating the salt water level obtained by the arithmetic processing at that time to the reference water level,
Always detect accurate salt water level and salt water concentration. Here, in the arithmetic processing unit (20), when the detection signal of reaching the reference water level is received when the salt water is supplied from the salt water tank (13) to the processing container (11) (region B in FIG. 2), The water level in the salt water tank (13) is lowered, and the detected pressure value is also lowered from a to b. And
This water level reaches the reference water level, the arithmetic processing unit (20) compares and calculates the reference water level with the value of the water level by the arithmetic processing at the time when the arrival signal to the reference water level is received, and calculates the resulting water level. Calibrate to the reference water level. Note that the calibration at this time may be performed by calibrating the pressure detection signal itself from the salt water pressure detector (21), instead of the water level value obtained by the calculation process.
Further, since the water level difference between the pressure detection position of the salt water pressure detector (21) and the reference water level position by the reference water level detector (22) is fixed, the reference of the salt water level from the reference water level detector (22). At the time of receiving the signal to reach the water level, the specific gravity of the salt water is obtained from the difference in the water levels, and the salt water concentration is calibrated from the specific gravity of the salt water. Calibration of this concentration, during the supply of salt water, during that time, since the salt water concentration does not change, as described above,
It can be easily performed from its specific gravity, and by doing so, it is possible to calibrate the assumed salt water concentration that was assumed to be approximately the saturation concentration, and the salt water salt water concentration value after this calibration is the amount of decrease in the water level after this, The amount of water level rise during replenishment,
It serves as a reference value when the change in concentration due to the dissolution of the regenerating salt after replenishing water is calculated by calculation processing.

On the other hand, in the arithmetic processing unit (20), the point when the detection signal of reaching the reference water level is received is the salt water tank (13).
When replenishing raw water to the water (region C in Fig. 2)
Indicates that the water level in the salt water tank (13) is rising and the detected pressure value is also rising from b to c.
Then, this water level reaches the reference water level, and the arithmetic processing unit
The value of the water level obtained by the arithmetic processing at the time point when (20) receives the signal to reach the reference water level is compared with the reference water level, and the resulting water level obtained by the arithmetic processing is calibrated to the reference water level. Note that the calibration at this time may be performed by calibrating the pressure detection signal itself from the salt water pressure detector (21), instead of the water level value obtained by the calculation process. The salt water at this time is a state in which salt water having a concentration close to the saturation concentration before the start of replenishment is diluted by the raw water at the time of replenishment, and the water level at the time of replenishment is the salt water tank (13) before the start of replenishment. It can be easily calculated based on the amount of salt water remaining in the salt water and the concentration (or specific gravity) of the salt water obtained from the concentration and the amount of supplemented water, but the concentration of salt water remaining in the salt water tank (13) (or specific gravity) Can be more accurately determined by using the value of the specific gravity (or the concentration of salt water) calibrated at the time of supplying the salt water. Furthermore, when the salt water level reaches the reference water level, Thus, by determining the specific gravity of the salt water from the water level difference and performing calibration with this value, it is possible to accurately detect subsequent changes in the water level. Further, since the amount of increase in the water level after the salt water level reaches the salt for regeneration can be regarded as the same diluted state as the salt for regeneration hardly dissolves as described above, it is performed by the same arithmetic processing as described above. You can, but as mentioned above,
By calibrating the specific gravity of salt water, it is possible to reliably detect the salt water concentration at the completion of replenishing water. Therefore, since the salt water concentration (or specific gravity) at the completion of replenishing water can be reliably detected, it is also possible to reliably detect the change in concentration and the change in water level due to the regenerating salt that gradually dissolves after that. It is possible to reliably detect the case where the salt water concentration is insufficient due to the lack of water and the occurrence of the salt bridge described above.

As described above, calibration is performed using the signal from the reference water level detection signal (22) to obtain the salt water tank (1
The water level in 3) will be reliably detected, and
When the salt water concentration is calculated from the gradually changing salt water pressure after the completion of water refilling (region D in FIG. 2)
Also, since the detected pressure value by calculation processing (or the water level itself) is calibrated by the arrival signal of the reference water level, it is possible to accurately grasp the specific gravity of the salt water that can be calculated at that time. In addition, the water level can be accurately detected. By such a calibration operation, especially when salt water of low concentration is repeatedly supplied during salt water supply, due to the characteristics of the salt water pressure detector, the influence of temperature, the detection error of the salt water concentration and other external factors, A small error due to the factors is accumulated and the actual salt water tank (1
3) Salt water tank (13) based on the water level and concentration inside and calculation processing
It is possible to effectively prevent the loss of control due to a large difference between the water level and the concentration in the inside.

In the above description, the reference water level detector (22)
The process of calibrating the calculation result of water level and concentration based on the signal from is performed at the time of supplying salt water and when replenishing water. By doing this, it is possible to calibrate the detected water level when supplying salt water and when replenishing water. Is the most preferable, but there is little error between the salt water supply operation and the subsequent water replenishment operation during one regeneration operation of the water softener. Alternatively, the calibration process may be performed at any one of the water replenishing times, or may be performed every appropriate number of times of regeneration without performing the calibration process every regeneration operation. Also,
In the present invention, since the water level and concentration of salt water in the salt water tank (13) can be reliably detected, the supply amount of salt water is changed according to the concentration of salt water, and the ion-exchange resin in the treatment container (11) is kept constant. It is also possible to configure so that a certain amount of salt acts, and with such a configuration, it is possible to achieve reliable regeneration of the ion exchange resin and prevention of waste of regeneration salt.
In the illustrated embodiment, the processing device (20) according to the present invention is provided separately from the control device (17) for controlling the control valve (12) of the water softener (10). ,
It may be integrated into the control device (17).

[0027]

The present invention has the above-mentioned structure.
It is possible to reliably detect the water level and concentration of salt water in the salt water tank, and to automatically calibrate the detected value with a simple configuration. Therefore, it is necessary to regenerate the ion exchange resin. A certain amount of salt water can be reliably introduced and the resin capacity can be completely regenerated. Therefore,
Since it is possible to reliably prevent defective regeneration of the water softener,
It is possible to reliably prevent leakage of hardness to the wake side, very safe regeneration control of the water softener is possible, stable supply of soft water to the wake side is possible, and salt water Since the supply amount and the salt water concentration can be surely grasped, it is not necessary to use an unnecessarily large amount of salt water, and it is possible to prevent waste of the regenerating salt. According to the invention,
By detecting the salt water pressure change in the salt water tank with the salt water pressure detector, the salt water level and the salt water concentration can be reliably detected. Since the processing contents, for example, the coefficient when calculating the water level etc. from the detected pressure can be corrected by the same component parts, the adjustment is easy, and moreover,
Excellent versatility.

[Brief description of drawings]

FIG. 1 is a drawing for explaining a configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the principle of detecting the water level and concentration of salt water in the present invention.

[Explanation of symbols]

 (10) Water softener (11) Treatment container (13) Salt water tank (14) Salt water line (20) Processor (21) Salt water pressure detector (22) Reference water level detector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location G01N 9/26 A (72) Inventor Hiroyuki Takeda 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd. (72) Inventor Kenichiro Takematsu 7 Horie-cho, Matsuyama-shi, Ehime Miura Kogyo Co., Ltd. (72) Inventor Hideaki Tomozawa 7 Horie-cho, Matsuyama-shi, Ehime Miura Kogyo Co., Ltd. (72) Inventor Hidetoshi Mizogaki Ehime 7 Horie-cho, Matsuyama City Miura Industrial Co., Ltd.

Claims (2)

[Claims] 1. A salt container, which is connected to a processing container (11) containing an ion-exchange resin for removing hardness in raw water and is supplied for recovering the capacity of the ion-exchange resin, In the salt water tank (13) that replenishes the raw water after the salt water is supplied, the salt water pressure change is detected at a position below the lower limit position of the water level fluctuation in the salt water tank (13), and the water level in the salt water tank (13) is detected. Detects whether or not the water level has reached a preset reference water level, and calculates the water level and concentration of the salt water in the salt water tank (13) based on the change in the salt water pressure, and detects the arrival at the reference water level. When the signal is detected, the salt water level obtained by the arithmetic processing is calibrated to a reference water level, and the salt water concentration obtained by the arithmetic processing is calibrated based on the detected pressure value at this point. Soft Detection method of saline water and brine concentrations in brine tank vessels. 2. A salt water, which is connected to a processing container (11) containing an ion exchange resin for removing hardness in raw water and is supplied for recovering the capacity of the ion exchange resin, In the salt water tank (13) that replenishes the raw water after the salt water is supplied, a salt water pressure detector (21) for detecting a change in the salt water pressure at a position lower than the lower limit position of the water level fluctuation in the salt water tank (13), A reference water level detector (22) for detecting whether the water level in the salt water tank (13) has reached a reference water level preset at an appropriate position within the water level fluctuation range,
Based on the change in the salt water pressure detected by the salt water pressure detector (21), the water level and concentration of the salt water in the salt water tank (13) is obtained by arithmetic processing, and the reference water level detector
(22) at the time of detecting the arrival detection signal to the reference water level of salt water, calibrate the salt water level obtained by the arithmetic processing to the reference water level and the salt water concentration obtained by the arithmetic processing at the detection pressure at this time. An apparatus for detecting a salt water level and a salt water concentration in a salt water tank of a water softener, comprising an arithmetic processing unit (20) for calibrating based on a value.