JP2962043B2 - Hot water mixing control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing control apparatus for adjusting a mixing ratio of hot water and water to obtain an optimum mixed hot water temperature.

[0002]

2. Description of the Related Art Conventionally, there has been a water / water mixing apparatus of this kind as shown in FIG. (For example, see JP-A-1-31227.
No. 9) In FIG. 9, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve is provided in connection with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 and a hot side valve seat 5 for reducing the primary pressure PH1 of the hot water flow path 1, a water side valve body 6 for reducing the primary pressure PC1 of the water flow path 2, and a water side. A valve seat 7, a valve shaft 8 connecting the hot water side valve body 4 and the water side valve body 6, and a primary pressure P after decompression of hot water and water.
H1 and a piston 9 that operates with a pressure difference between PC1 and H1. Then, even if the pressure of the hot water or the water changes suddenly, the automatic pressure regulating valve 3 moves at that pressure, and acts so that the secondary pressure PH2 of the hot water and the water and the PC2 are always kept equal. Further, a bias means 10 is provided on the valve shaft 8, and the bias means 1 is provided.
0 is connected to the end of the valve shaft 8 and the bobbin 11 and the coil 12 and the coil 1 wound on the bobbin 11 and insulated.
The coil 12 is connected to a control means 18 via a flexible portion 14.

When a current flows from the control means 18 to the coil 12, the current crosses the magnetic field generated by the permanent magnet 13, so that a bias force is applied to the valve shaft 8 by Fleming's law. For this reason, the automatic pressure adjustment point is shifted by the amount of the bias force. For example, the secondary pressure PH2 and the PC2 of hot water and water are constantly adjusted at a point of 2: 1. As a result, the tapping temperature increases. . Thus, the temperature of the mixed hot water is changed by changing the current to the coil 12. The control means 18 superimposes a minute AC signal when a current flows through the coil 12.
This is to reduce the hysteresis characteristics of the magnetic circuit of the bias means 10 and the sliding resistance at the start of driving. Reference numeral 19 denotes a mixing section of hot water and water. After mixing, the hot water is discharged through a flow rate control opening / closing valve 20. The control means 18 biases the bias means 10 and the flow rate control on / off valve driving means 21 to adjust the temperature so as to match the value of the setting means 17.

[0004]

However, in the above configuration, if the driving amount of the automatic pressure regulating valve 3 is small, the space between the hot-water-side valve element 4 and the hot-water-side valve seat 5 often becomes narrow. In this case, the sensitivity of the automatic pressure regulating valve 3 is increased, and even if the valve is slightly operated, the temperature of the mixed hot water greatly changes, and hunting occurs at a normal gain. Similarly, when the drive amount is large and the space between the water-side valve element 6 and the water-side valve seat 7 is narrow, the sensitivity of the automatic pressure regulating valve 3 is high, and even if the valve is slightly operated, the temperature of the mixed hot water changes greatly, and the normal operation is performed. Hunting occurs at a gain of.

[0005] Further, regardless of the driving amount due to the pressure difference or the like, the valve body and the valve seat of either the hot water side or the water side come close to each other, and the sensitivity of the automatic pressure regulating valve 3 is increased. The seat may collide at a high speed and mechanically deform.

The present invention has been made to solve the above-mentioned conventional problem, and has as its first object to stabilize a mixing valve by adjusting a temporal change amount of a drive amount according to a magnitude of a drive amount.

A second object of the present invention is to use a valve position detecting means to adjust the temporal variation of the driving amount of the mixing valve control means when the hot water side or water side valve element and the valve seat come close to each other to adjust the mixing valve. The purpose is to ensure stability and prevent the valve body and valve seat from being deformed by collision.

[0008]

According to the present invention, there is provided a hot and cold water mixing control apparatus comprising: a hot water flow path and a water flow path; a mixing valve for adjusting flow rates of the hot water flow path and the water flow path; A mixing valve driving unit that drives the mixing valve; and a control unit that outputs a driving signal to the mixing valve driving unit. The control unit adjusts a temporal change amount of the driving amount according to the magnitude of the driving amount. And a mixing valve control means.

According to another aspect of the present invention, there is provided a hot water mixing control apparatus comprising: a hot water flow path and a water flow path; a mixing valve for adjusting flow rates of the hot water flow path and the water flow path; Valve driving means for driving the mixing valve, valve position detecting means for detecting the valve position of the mixing valve, and control means for outputting a drive signal to the mixing valve driving means, wherein the control means is the valve position detecting means And a mixing valve control means for adjusting a temporal change amount of the driving amount by the signal of (1).

[0010]

According to the present invention, the temporal variation of the drive amount is adjusted according to the magnitude of the drive amount to stabilize the mixing valve.

When the valve seat on the hot water side or the water side approaches the valve seat using the valve position detecting means, the amount of change in the driving amount of the mixing valve control means with time is adjusted to stabilize the mixing valve. The purpose is to prevent the valve seat from being deformed by collision.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a hot and cold water mixing control device, and FIG.
The same reference numerals are used to denote the same parts, and detailed description is omitted. Reference numeral 22 denotes an urging means, which includes the automatic pressure regulating valve 3 and the urging means 22.
Forms the mixing valve 23. Numeral 24 denotes a mixing valve driving means for applying a variable bias force to the mixing valve 23 in opposition to the force of the urging means 22. The mixing valve driving means 24 includes a first plunger 25 made of a magnetic material and the first plunger 2.
5 has a first coil 26 which is waterproof and insulated, said first coil 26 being connected to the control means 18. The mixed hot water temperature is detected by the mixed hot water temperature detecting means 15. Numeral 40 denotes a valve position detecting means, which uses a differential transformer as an example here.

The flow rate of the mixed hot water is adjusted downstream of the mixing section 19 by a flow control on-off valve 20. The flow rate control on-off valve 20 is provided with a valve housing 27, a conical flow control valve body 28 for adjusting the flow rate in the valve housing, and a corresponding valve seat 29. In order to balance the flow control valve body 28 and the primary pressure of the fluid (the pressure of the mixing section 19), the grooved diaphragm 30 as a flexible pressure receiving body is connected to the flow control valve body 28.
And between the valve housing 27 and the groove 30a.
And the effective pressure receiving area is always equal to the diameter of the valve seat 29 regardless of the lift amount of the flow control valve body 28. The back pressure chamber 31 completely separated from the primary side by the diaphragm 30 and the flow control valve body 28
It communicates with the next side through a communication hole 32. The flow control valve body 28 is urged by a spring 34 as an urging means in a direction in which it comes into contact with the toilet seat 29. In addition, there is a second coil 35 and a pipe 36 having one end surface sealed, and the second coil 35 is driven by the amount of electricity supplied to the second coil 35.
Plunger 37 slides inside the pipe 36. The second plunger 37 is connected to the flow control valve body 28 via a shaft 38.
It is structured to work with. The second coil 35, the pipe 36, and the second plunger 37 form the flow rate adjusting on / off valve driving means 21.

In the above arrangement, the control means 18 adjusts the flow rate by controlling the amount of current supplied to the second coil 35. To reduce the flow rate to zero (stop), the control means 18 controls the flow rate.
In 8, when the power supply to the second coil 35 is cut off, the flow control valve body 28 urged by the spring 34 comes into contact with the toilet seat 29, and the fluid stops flowing. When the second coil 35 is energized, the second plunger 37 is sucked or pushed out, the flow control valve body 28 is lifted against the urging force of the spring 34, and the fluid (mixed hot water) starts flowing. That is, the control means 18 adjusts the flow control valve body 28 to an arbitrary lift amount by changing the amount of current supplied to the second coil 35 to control the flow amount.

FIG. 2 shows an example of the control means 18. 41 is a mixing valve control means for inputting signals from the mixed hot water temperature detecting means 15 and the setting means 17 to calculate a driving amount of the mixing valve 23, and 42 is a mixing valve driving means (first signal) based on a signal from the mixing valve control means 41.
A first drive amount setting means 43 for setting a drive amount of the coil 26; a flow control valve control means 43 for inputting a signal of the setting means 17 and calculating a drive amount of the flow control valve 20;
Is a second drive amount setting means for setting the drive amount of the flow control on / off valve drive means 21 based on a signal from the flow control on / off valve control means 43.

Next, the operation of the configuration of the present invention will be described. When performing temperature control, the control unit 18 sends the first coil 26
When a current flows through the first plunger 25 made of a magnetic material,
Applies a biasing force to the valve shaft 8 according to Fleming's law. When the bias force and the urging force of the urging means 22 are balanced, the automatic pressure regulating valve 3 is balanced. Therefore,
By changing the current flowing through the first coil 26, the balance point of the automatic pressure regulating valve 3 can be moved. For example, when the current is small, the force of the urging means 22 is stronger, so that the water-side valve body 6 opens more widely than the hot-water-side valve body 4, and the tapping temperature decreases. When the current is increased, the plunger 25 is pushed out against the force of the urging means 22, whereby the hot-water-side valve body 4 is opened, and as a result, the hot-water temperature rises.

In this way, the control means 18 receives the signal from the mixed hot water temperature detecting means 15 and the signal from the setting means 17 so that the mixing valve control means 41 and the first drive unit control the temperature of the hot water to the set temperature. The amount of current flowing through the first coil 26 is varied by the amount setting means 42 to adjust the mixing valve 23.

If the tapping temperature is close to the supplied water temperature, the amount of hot water to be mixed is small, and the hot water side valve body 4 and the hot water side have no problem. The space between the valve seats 5 is very narrow. On the other hand, when the temperature of the hot water in the hot water flow path 1 is close to the hot water temperature, the amount of water to be mixed is small, and the space between the water-side valve body 6 and the water-side valve seat 7 is very narrow. In such a case, it is difficult to stably maintain the mixing valve, and hunting often occurs.

Therefore, the present invention takes the following measures to prevent the above phenomenon. At the time of normal tapping, the mixing valve control means 41 is controlled so that the temperature detected by the mixed hot water temperature detecting means 15 coincides with a preset temperature (or a temperature set by the setting means 17; hereinafter, referred to as a set temperature Ts). The drive amount is set to adjust the current flowing through the first coil 26 via the first drive amount setting means 42.

The control operation when the supply hot water temperature fluctuates will be described with reference to the flowchart of FIG. 3, the output characteristic diagram of FIG. 4, and the coefficient characteristic diagram of FIG. Step 10 in FIG.
In the temperature control of 0, first, the set temperature and mixed hot water temperature detecting means 1
5 and obtains the difference E (step 101).
And The control amount f (E) is calculated using the deviation E in step 10.
Calculate with 2. Where f (E) is the well-known PI
Any of D control, fuzzy control, etc. may be used, and the type of control law is not fixed. Assuming that the driving amount is P, the driving amount output at the time of the previous sampling is Pn-1. The gain coefficient g (Pn−
1) is calculated in step 103. And the control amount f
(E) is multiplied by a coefficient g (Pn-1) in step 104 to obtain a drive change amount ΔP. In step 105, the previous drive amount P
This ΔP is added to n−1 to obtain a drive amount P. Using this, a signal is sent to the first drive amount setting means 40 to set the current flowing through the first coil 26, and drive is performed. This temperature control is repeatedly performed at a constant sampling cycle.

In FIG. 4, when the supply hot water temperature Th fluctuates, the driving amount is large as shown by P01 and bc in FIG.
In the case where there is a gap, the tapping temperature is stable as in T01 even under normal control. When the tapping temperature is low, the amount of driving is small. In the case of P02 which is between a and b in FIG. 5, the drive amount is P02 because the sensitivity of the mixing valve is high unless g (Pn-1) is used in obtaining the control amount.
X, and the tapping temperature also causes hunting like X in T02. When g (Pn-1) is used, the driving change amount ΔP becomes small, so that the driving amount becomes like Y in P02, the highly sensitive mixing valve operates stably, and the tapping does not occur as in Y in T02 without hunting. Temperature characteristics can be maintained. Specifically, as shown in FIG. 3, the coefficient g (Pn-1) obtained in step 103 is reduced in the case of a drive amount such that the valve element on the hot water side or the water side approaches the valve seat, and 1 otherwise. I do. The coefficient g (Pn-1) can be corrected by the flow rate.

Another embodiment of the present invention will be described with reference to FIGS. 6, 7, and 8. FIG. The same parts as those in the flowchart of FIG. 3 in the above embodiment are denoted by the same reference numerals, detailed description is omitted, and different parts will be mainly described.
Regardless of the drive amount due to the pressure difference or the like, the valve body and the valve seat on either the hot side or the water side approach each other to increase the sensitivity of the automatic pressure regulating valve 3, and the valve body and the valve seat collide at high speed with the same gain. In some cases, it may be mechanically deformed. Therefore, a method of controlling using the valve position detecting means 40 for detecting the valve position will be described below.

In FIG. 6, in the temperature control of step 100, first, a difference between the set temperature and the signal of the mixed hot water temperature detecting means 15 is obtained, and this difference is set as a deviation E (step 101). Deviation E
Is used to calculate the control amount f (E) in step 102.
In step 106, the valve position R is detected from the signal of the valve position detecting means 40 by the differential transformer. Using the valve position R as a variable, the gain coefficient h (R) is calculated in step 107.
Calculate with. Then, in step 108, the control amount f (E) is multiplied by the coefficient h (R) to obtain the drive change amount ΔP. Step 1
In step 09, this ΔP is added to the previous drive amount Pn−1 to obtain a drive amount P. Using this, a signal is sent to the first drive amount setting means 42 to set the current flowing through the first coil 26 and drive is performed. This temperature control is repeatedly performed at a constant sampling cycle.

In FIG. 7, the position R of the mixing valve is set to R in FIG.
In the case where the temperature falls within the range from 1 to R2, even if the temperature of the supplied hot water fluctuates even with normal temperature control, the hot water temperature becomes T01 as shown in FIG. 7A. However, when the tapping temperature is low and the valve position is between the fully closed positions R0 and R1 in FIG. 8, the hot-side valve body 4 and the hot-side valve seat 5 are close to each other, and the valve sensitivity is high. For this reason, the amount of change in the drive amount is reduced so that the drive amount changes as indicated by P2 in FIG. 7B. Then, the tapping temperature can be maintained at a stable temperature like T02 as shown in FIG. 7B. Further, since the driving amount is reduced, the valve body and the valve seat do not collide at a high speed, and the risk of mechanical deformation of the valve is eliminated.

[0025]

As described above, according to the hot and cold water mixing control device of the present invention, when the valve sensitivity is high because the temporal change of the drive amount is adjusted by the magnitude of the drive amount at the time of the previous sampling. The driving valve has a small amount of change over time and can operate the mixing valve stably.

When the valve seat is close to the valve body on either the hot water side or the water side irrespective of the driving amount due to a pressure difference or the like, the valve position is detected by the valve position detecting means. In a valve position where the sensitivity of the mixing valve increases, the amount of temporal change in the driving amount of the mixing valve control means can be adjusted to stabilize the mixing valve and prevent the valve element and the valve seat from being deformed by collision.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a hot and cold water mixing control device of the present invention.

FIG. 2 is a control block diagram of the hot and cold water mixing control device.

FIG. 3 is a flowchart of the control block.

FIG. 4 (a) is an output characteristic diagram of the device of the present invention at the time of hot water tapping, and FIG.

FIG. 5 is a characteristic diagram of a coefficient g (Pn-1) of the present invention.

FIG. 6 is a flowchart of a control block of a second embodiment of the device of the present invention.

FIG. 7 (a) is an output characteristic diagram at the time of hot water tapping of the second embodiment of the present invention device, and (b) is an output characteristic diagram at the time of low temperature tapping in the second embodiment of the same device.

FIG. 8 is a characteristic diagram of a coefficient h (R) according to a second embodiment of the present invention;

FIG. 9 is a cross-sectional view of a conventional hot and cold water mixing apparatus.

[Explanation of symbols]

 Reference Signs List 1 hot water flow path 2 water flow path 3 automatic pressure regulating valve (mixing valve) 18 control means 24 mixing valve driving means 40 valve position detecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 31/06 F16K 11/00 F16K 31/66

Claims (2)

(57) [Claims] 1. A hot water flow path and a water flow path, a mixing valve for adjusting flow rates of the hot water flow path and the water flow path, a mixing valve driving means for driving the mixing valve, and a drive signal to the mixing valve driving means. A hot water mixing control device having mixing valve control means for adjusting a temporal change amount of the driving amount according to the magnitude of the driving amount. 2. A hot water flow path and a water flow path, a mixing valve for adjusting flow rates of the hot water flow path and the water flow path, a mixing valve driving means for driving the mixing valve, and detecting a valve position of the mixing valve. Valve position detecting means, and a control means for outputting a drive signal to the mixing valve driving means, wherein the control means adjusts a temporal change of a driving amount by a signal of the valve position detecting means. A hot and cold water mixing control device having: