JPH0634930B2 - Resin capacity detection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use of the Invention] The present invention is a hard water softening device using an ion exchange resin (hereinafter, referred to as a resin), which constantly calculates the resin capacity regardless of whether water is passed or regenerated. And an apparatus for displaying the same.

[Prior Art] The following methods have been used so far for detecting the ability of a resin.

That is, a method is known in which the resin capacity at that time is detected based on the relationship between the hardness of the raw water and the water flow rate, based on the set initial capacity during water flow.

However, with this method, the resin capacity (remaining capacity) before regeneration
Due to the fact that the level and the amount of salt water used for regeneration are not constant, there is a drawback in that the capacity display when passing water differs from the actual capacity.

In addition, the residual capacity of the resin is grasped in advance by the correlation between the hardness of the raw water and the water flow rate, and at the time of regeneration, how much salt water should be used to set the resin capacity at that time as the initial capacity. In some cases, it has been attempted to determine whether or not to recover by using the amount of salt water used or the regeneration time (see Japanese Utility Model Laid-Open No. 60-91246), but in this case,
There is an inconvenience that it is not displayed how much the resin has recovered its capacity unless the necessary and sufficient amount of salt water is supplied such as when the regeneration is completed halfway.

For this reason, in the conventional hardness softening device, there is often a situation in which regeneration is started even though the ability is sufficient, or even when the ability is lost, the hardness is leaked without regeneration.

[Object of the Invention] The present invention focuses on the above-mentioned problems, and a method for accurately displaying the ability of a resin over time even if the ability of the resin before regeneration and the amount of salt water during regeneration are not constant. And its purpose is to provide the device.

SUMMARY OF THE INVENTION In summary, the present invention provides a resin cylinder filled with an ion exchange resin, a salt water tank storing salt water, a control valve mounted on the resin cylinder, and a salt water line connected to each of the control valves. In a water softening device comprising each line of a raw water line, a soft water line and a drainage line, a flow meter for detecting the flow rate of raw water or salt water flowing through the resin is installed internally, and based on the value of this flow meter, during water flow By subtracting a predetermined decrease in resin capacity according to the hardness of the raw water, and by adding a predetermined increase in resin capacity in relation to the salt water used during regeneration, The present invention proposes a method and apparatus characterized in that the resin capacity at that time is continuously displayed through each process.

In the above method, the calculation factor during water flow is determined by subtracting the value calculated by the water flow rate measured by the flowmeter and the hardness of raw water from the residual capacity of the resin as the (-) component. In the case of regeneration, it is determined by adding to the residual capacity of the resin the value calculated in advance from the amount of salt water passing measured by the flowmeter as the (+) component, and the output signal at that time is sequentially output to the controller attached to the device. Will be sent.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings. Figure 1 shows
It is an explanatory view showing roughly the whole water softening device using the method in this invention. In the figure, reference numeral (1) is Na
This is a type of cation exchange resin, which is used to soften the raw water by contacting the raw water with ion exchange with the hardness components (for example, Ca ²⁺ , Mg ²⁺ ) contained in the raw water.
(2) is a resin cylinder filled with the ion exchange resin (1), and (4) is a salt water tank for storing the salt water (3) and the raw salt. Reference numeral (12) is a water collecting pipe provided at the center of the resin cylinder (2) and is connected to the control valve (5).

A salt water line (6), a raw water line (7), a soft water line (8), and a drainage line (9) are connected to the control valve (5) connected to the resin cylinder (2), respectively. Raw water flows in from the upper part of the resin cylinder (2) by the raw water pressure and flows from the water collection pipe (12) to the soft water line (8). At the time of regeneration, the control valve (5) works to suck salt water through the salt water line (6) to regenerate the resin.
At that time, the drain containing the removed hardness is collected in the water collection pipe (12).
Through the drainage line (8).

(10) is a flow meter, which is a water collecting pipe (1
It is attached to 2). (11) is an arithmetic unit, which is connected to the flowmeter by a signal line (13). (14) is a display unit connected to the arithmetic unit (11). As a specific form of this display unit, a bar graph display, a digital display showing a percentage, or the like is used. The arithmetic unit (11)
The flow meter constantly measures the flow rate of raw water or salt water flowing through it, and based on that value (flow rate), detects and calculates the realistic regeneration state of the resin, and displays it on the display unit (14). Is configured to.

A method of detecting the resin capacity of the water softening device having such a configuration will be described with reference to the flow sheet of FIG. 2 and the graph of FIG. 3 showing the correlation between the resin capacity and the amount of regenerated salt.

For example, assuming that the amount of resin is about 20 and the concentration of salt water used for regeneration is 10%, the hardness removal capacity of this resin is 1320 g (the hardness resin capacity in this case is shown in calcium carbonate conversion value). ). Therefore, the raw water hardness value is 100p
pm, the raw water passes values takes as an example the case of 5.7 m ^3, water passing through, (hardness removal value of the resin) operation circuit raw water hardness value × raw water passing amount = 100 × 5.7 → 570 resin Sonzan capacity calculation = 1320− 570 → 570 (residual hardness removal capacity value of resin) (750/1320) × 100 → 57 (residual capacity of resin is 57%) Display circuit Remaining capacity display = 57% Displayed during playback, resin hardness removal capacity Is 57%, supplying a salt amount of Δx ₁ increases the capacity by ΔC ₁ . That is, when converted to the resin amount of 20 in this case, Δx ₁ = 24
When only 75 g of salt is supplied, ΔC ₁ = 43% rises,
100% ability will be restored.

If, for some reason, only Δx ₀ = 770 g of salt was supplied, the initial capacity at the start of the next water passage would be ΔC _0.
This is about 75%, an increase of 18%. In this case, since the concentration of salt water is 10%, if 24.75 salt water passes through, the capacity of the resin will increase to 100%. The resin capacity is displayed as 100% on the display.

The arithmetic unit (11) calculates the regeneration state of the resin based on the above, and displays it on the display unit. With this display, the state of the ability of the resin at that time can be visually checked.

[Effects of the Invention] The present invention is configured as described above, and since the resin capacity is constantly displayed throughout each process of water passage and regeneration, to what extent the resin capacity is currently recovered Can be confirmed from the outside. Therefore, even if the regeneration is terminated in the middle, it is possible to know how much water can be passed, and a situation in which water leaks beyond the resin capacity and causes hardness leakage will not occur. In addition, it also serves as a barometer for knowing whether the internal circuit is working normally and whether the suction action of salt water is proper, and the regeneration time can be accurately controlled according to the resin capacity.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG.
FIG. 1 is a flow sheet showing the resin capacity detection method of the water softening device, and FIG. 3 is a graph showing the correlation between the resin capacity and the amount of regenerated salt. (1) …… ion exchange resin, (2) …… resin cylinder (3) …… salt water, (3) …… salt water tank (5) …… control valve (6) …… salt water line, (7) …… Raw water line (8) …… Soft water line, (9) …… Drainage line (10) …… Flowmeter, (11) …… Computing unit (12) …… Collection pipe, (13) …… Signal line (14) ...... Display

Claims (2)

[Claims] 1. An apparatus for softening hard water using an ion-exchange resin, wherein a flow meter for detecting the flow rate of raw water or salt water flowing through the resin is provided internally, and based on the value of the flow meter, the raw water is supplied when water is passed. By subtracting a predetermined decrease in resin capacity according to the hardness, and by adding a predetermined increase in resin capacity in relation to the salt water used during regeneration,
A resin capacity detection method characterized by continuously displaying the resin capacity at that time through each process of water flow and regeneration. 2. A resin cylinder (2) filled with an ion exchange resin (1).
And a salt water tank (4) storing salt water (3), and the resin cylinder (2)
A water softening device comprising a control valve (5) attached to the control valve and a salt water line (6), a raw water line (7), a soft water line (8) and a drain line (9) connected to the control valve, respectively. In the above, a flow meter for detecting the flow rate of raw water or salt water flowing through the resin, and based on the value of this flow meter, at the time of water flow, a decrease in the resin capacity that is predetermined according to the hardness of the raw water is subtracted, and At the time of regeneration, an arithmetic unit (11) that functions to add a predetermined increase in resin capacity in relation to the salt water used, and a display unit (14) connected to this arithmetic unit Characteristic resin capacity detection device.