JPH043824A - Hot water and cold water mixing control device - Google Patents

Abstract

PURPOSE:To perform stable and rapid operation of a mixing valve by a method wherein at least one of amplitude and a frequency is changed by means of a drive signal to a mixing valve drive means, and an AC signal is overlapped with a drive signal. CONSTITUTION:A drive signal to a mixing valve drive means coil is detected by a drive signal detecting means 47 to output the signal to a main control means 48. By means of an output therefrom, the main control means 48 outputs a signal to an AC signal generating means 49 to change amplitude and the frequency of an AC signal overlapped with a drive current. Since an output from the AC signal generating means 49 is overlapped with a drive signal, it is inputted to a first drive amount setting means 50. For example, a mixing valve wherein when a drive current is low, sensitivity is high and when the drive current is high, the sensitivity is low is used, an AC signal approximately proportioning the drive current is overlapped. This constitution resonance of the mixing valve and enables stable and rapid operation of the mixing valve by overlapping a high most-efficient AC signal.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a hot water mixing control device that adjusts the mixing ratio of hot water and water to obtain an optimal mixed water temperature. 2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG. (For example, JP-A-1-312279) In FIG. 4, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 that reduces the primary pressure PH1 of the hot water flow path 1, a hot water side valve seat 5, a water side valve body 6 that reduces the pressure of 1 Suita force PCI of the water flow path 2, and a water side valve body 4 that reduces the pressure of the primary pressure PH1 of the hot water flow path 1. Valve seat 7, hot water side valve body 4, and water side valve body 6
1 Suita PH1 after depressurizing hot water and water,
It is composed of a piston 9 that operates based on the PCI pressure difference, and even if the pressure of hot water or water changes by 9 degrees, the automatic pressure regulating valve 3 moves with that pressure, and the secondary pressures PH2 and PC2 of hot water and water are adjusted. It works so that it always remains equal. Further, a bias means 10 is provided on the valve shaft 8, and the bias means 10 is provided to sandwich a bobbin 11 connected to the end of the valve shaft 8, a coil 12 wound on the bobbin 1 and insulated, and the coil 12. The coil 12 is connected to a control means 18 via a flexible part 14. When a current is passed through the coil 12 from the control means 18, the current crosses the magnetic field generated by the permanent magnet 13, so that a piascus is applied to the valve stem 8 according to Fleming's law. For this reason, the automatic pressure adjustment point shifts by the amount of pie scan,
For example, the secondary pressures PH2 and PC2 of hot water and water are always regulated at a ratio of 2:1, and as a result, the temperature of the hot water becomes high. By changing the current to the coil 12 in this way, the mixed water temperature is changed. The control means 18 superimposes a minute alternating current signal when passing current through the coil 12. (FIGS. 5a and 5b) This is to reduce the hysteresis characteristic 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 for hot water and water. After mixing, the hot water is discharged via a flow rate regulating on-off valve 20. The temperature of the hot water is determined by a mixed hot water temperature detector (for example, a thermistor) 15, and the flow rate is determined by a flow rate detection means 16. The control means 18 energizes the B earing means 10 and the flow rate adjustment valve drive means 21 to adjust the temperature so as to match the value of the setting means 17. Problems to be Solved by the Invention However, with the above configuration, the minute alternating current superimposed on the coil current is constant regardless of the magnitude of the coil current, so the superimposed minute alternating current may vary depending on the characteristics of the mixing valve, the flow rate, and the pressure. The mixing valve generated resonance vibration or hunting due to the AC signal. The present invention solves such conventional problems and
The purpose of this invention is to operate a mixing valve stably and quickly by changing at least one of the amplitude or frequency of a superimposed alternating current signal according to the magnitude of the flow. Means for Solving the Problems In order to solve the above problems, the hot water mixing control device of the present invention includes: a vortex flow path and a water flow path; a mixing valve that adjusts the flow rates of the iJi flow path and the water flow path; and the mixing valve. a mixing valve driving means for driving the mixing valve driving means, a control means for outputting a driving signal to the mixing valve driving means, and a driving signal detecting means for detecting a driving signal from the control means to the mixing valve driving means,
The control means includes alternating current signal generating means for changing at least one of amplitude or frequency according to the signal from the drive signal detecting means and superimposing an alternating current signal on the drive signal. Effects With the above configuration, at least one of the amplitude or frequency of the superimposed alternating current signal is changed by the signal of the drive signal detection means. EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that FIG. 1 is a sectional view of the hot water mixing device, and the same parts as in FIG. 4 are given the same numbers. Reference numeral 22 denotes an urging means, and the automatic pressure regulating valve 3 and the urging means 22 form a mixing valve 23. Reference numeral 24 denotes a mixing valve driving means that opposes the force of the urging means 22 and applies a variable bias. The mixing valve driving means 24 includes a plunger 25 made of a magnetic material.
A waterproof and insulated coil 26 is provided around the plunger 25, and the coil 26 is connected to the control means 18. The magnitude of the drive signal sent from the control means 18 to the coil 26 is checked by the drive signal detection means 27. The mixed water temperature is detected by a mixed water temperature detection means 15. The flow rate is detected by flow rate detection means 16. FIG. 2 shows an example of the control means 18. 28 is a main control means, 29 is an AC signal generating means, 30 is a first drive amount setting means, and 31 is a second drive amount setting means. Next, the operation of the configuration of the present invention will be explained. When a current is applied to the coil 26 from the control means 18, the plunger 25 made of a magnetic material moves to the valve stem 8 according to Fleming's law.
Give Paisuka to. This pie skirt and biasing means 2
The automatic pressure regulating valve is balanced when the two biasing forces are balanced. Therefore, by changing the Ti flow flowing through the 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 biasing means 22 is stronger, so the water side valve body 6 opens more than the hot water side valve body 4, and the hot water outlet temperature becomes lower. When the current is increased, the plunger 25 is pushed out against the force of the urging means 220, so that the hot water side valve body 4 begins to open, and as a result, the temperature of the tapped water increases. In this way, the control means 18 controls the mixed hot water temperature detection means 27.
By inputting this signal and the signal from the setting means 17, the current flowing through the coil 26 is varied and the mixing valve 23 is adjusted so that the temperature of the tapped water becomes the set temperature. The mixed hot water whose temperature has been reduced passes through the mixing section 19, and the mixed hot water temperature detection means 27 detects the hot water temperature. At this time, if the current flowing through the coil 26 is a direct current, it is possible to quickly move the mixing valve 23 to adjust the temperature of the mixed water due to the hysteresis characteristics of the mixing valve driving means 24 consisting of a magnetic circuit and the sliding resistance at the start of driving. Moreover, simply superimposing an alternating current signal of constant amplitude and constant frequency on the current flowing through the coil 26 will reduce the hysteresis characteristic of the mixing valve driving means 24 consisting of a magnetic circuit and the sliding resistance at the start of driving, but it will not be regular. The alternating current signal may cause resonance vibration of the mixing valve 23. Means for preventing the above phenomenon will be explained below. The characteristics of the mixing valve 23 differ slightly depending on its shape and other factors. Therefore, the sensitivity varies depending on the drive current, and the influence of the superimposed AC signal is not constant. Therefore, the drive signal to the mixing valve drive means (coil) 26 is detected by the drive signal detection means 27, and an output is passed to the main control means 28 according to the detected value. Based on this output, the main control means 28 sends a signal to the alternating current signal generating means 29 to change the amplitude and frequency of the alternating current signal that superimposes the drive on the flow. The output of the AC signal generating means 29 is input to the first drive amount setting means to be superimposed on the drive signal. For example, when using a mixing valve that has high sensitivity when the drive current is small and low sensitivity when the drive current is large,
), the drive is superimposed with an AC signal approximately proportional to the flow. The flow of the combined drive is as shown in FIG. 3(b). Also, when using a mixing valve that has high sensitivity when the drive current is large and low sensitivity when the drive current is small, see Figure 3 (C).
An AC signal that is approximately inversely proportional to the drive current is superimposed as shown in the figure below. The combined drive current is as shown in FIG. 3(d). Furthermore, when using a mixing valve that has high sensitivity when the driving current is approximately medium and has low sensitivity when the driving current is maximum and minimum, an alternating current signal as shown in Fig. 3 (fe) is superimposed. The flow of the combined drive is as shown in FIG. 3(f). On the other hand, when using a mixing valve that has high sensitivity when the drive current is maximum and minimum, and low sensitivity when the drive current is approximately medium, superimpose an AC signal as shown in Figure 3 (80).Synthesis The resulting drive current is as shown in Figure 3 (5). In this way, the amplitude of the AC signal superimposed on the drive current can be freely changed using the signal from the main control means. By suppressing the resonance of the valve and superimposing the most efficient AC signal, it is possible to operate the mixing valve stably and quickly.In the above embodiment, only the amplitude of the AC signal to be superimposed is changed, but the frequency can be changed. The amplitude and frequency may be changed at the same time.Also, the control means uses the second drive amount setting means 31 to drive the flow rate t11 node on/off valve driving means 21 to adjust the flow rate. In normal use, when the water pressure fluctuates, the automatic pressure regulating valve 3 operates as before, and if the pressure-receiving areas of the hot water side valve body 4, water side valve body 6, and piston 9 are made equal, the secondary pressure can be adjusted. P.H.
2 and PC2 maintain a state at a balance point by the biasing means 22 and the driving means 24. Effects of the Invention As described above, the hot water mixing control device of the present invention includes a hot water flow path, a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, and a mixing valve drive that drives the mixing valve. a control means for outputting a drive signal to the mixing valve drive means; and a drive signal detection means for detecting a drive signal from the control means to the mixing valve drive means, and the control means outputs a drive signal to the mixing valve drive means. The structure includes an AC signal generating means that changes at least one of the amplitude or frequency according to a signal from the means and superimposes an AC signal on the drive signal, and the amplitude of the AC signal to be superimposed can be freely adjusted according to the magnitude of the drive current. can change to. Therefore, it has the following effects. (1) Since the alternating current signal superimposed on the drive signal can be changed, stable valve operation can be achieved by removing the alternating current signal that resonates with the mixing valve. (2) Depending on the position of the mixing valve, the most efficient AC signal can be superimposed, so the mixing valve can operate stably and quickly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water mixing control device according to an embodiment of the present invention, FIG. 2 is a control block diagram of the device, FIG. 3 is an output characteristic diagram of the AC signal generating means of the device, and FIG. FIG. 5, which is a sectional view of a conventional hot water mixing control device, is a conventional AC signal characteristic diagram. 1...Hot water flow path, 2...Water flow path, 18.
...control means, 19...mixing section, 23.
...Mixing valve, 27... Drive signal detection means. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1 Figure 3 Figure 13 -・ 17-・ 23-・- N Aguchi Water flow path! ! 8 part f9 g column II III # Pj 71! Meeting Button MS Bengo Kanshin@Jajidefuro bht 沫 1 1 Director [Tatekokoo ll 11r Ru #h11ヲ61 Heavy It (l! 小交沠电菤6I r--一斯连电见tI -1ITi characteristic J1 alteration left figure procedural amendment (0 phantom June 73, 1990 Name of invention Iy! protection case with person who corrects hot water water mixing control device and flow rate control valve Patent issued
Address: 1006 Bold Kadoma, Kadoma City, Osaka Name (582) Representative of Matsushita Electric Industrial Co., Ltd.
Akio Tanii 4 Agent address: 571 Bold Kadoma, Kadoma City, Osaka Prefecture - 006 Matsushita Electric Industrial Co., Ltd. 5 Subject of amendment 6. Details of the amendment will be corrected. (2) I will revise the entire statement of attached document 9. (3) Box ■Kenko 1 diagram ~ G-guchi and Betsuya illusion 1
Shima t. (4) The mouth surface No. 61N-No. 10 Title of the invention Hot water mixing control device and flow rate control valve 2, Claims (1) A vortex flow path and a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, and driving the mixing valve. a control means for outputting a drive signal to the mixing valve drive means; and a drive signal detection means for detecting a drive signal from the control means to the mixing valve drive means; A hot water mixing control device comprising AC signal generating means for superimposing an AC signal on the drive signal so as to change at least one of amplitude or frequency according to the signal from the drive signal detection means. (2) An electromagnetic force generating means, an inflow path and an outflow path in an inverted casing,
It consists of a cylinder that slides inside the valve body to adjust the flow rate by the biasing force of the electromagnetic force generating means, and a control means that adjusts the current of the electromagnetic force generating means, and the control means controls the electromagnetic force generating means. A flow control valve having an AC signal generating means that changes at least one of amplitude or frequency depending on a current value applied to the means and superimposes an AC signal on a drive signal. 3. Detailed Description of the Invention Industrial Application Field The present invention relates to a hot water mixing control device that adjusts the mixing ratio of hot water and water to obtain an optimal mixed water temperature, and a flow rate control valve that controls the flow rate of fluid. . 2. Description of the Related Art Conventionally, there has been a hot water mixing control device of this type as shown in FIG. (For example, Japanese Unexamined Patent Publication No. 1-312279) In FIG. 6, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 for reducing the primary pressure PH1 of the vortex flow path 1, a hot water side valve seat 5, a water side valve body 6 for reducing the pressure of 1 Suita force PCI of the water flow path 2, and a water side valve. seat 7, hot water side valve body 4, and water side valve body 6
1 Suita PH1 after depressurizing hot water and water,
It is composed of a piston 9 that operates based on the PCI pressure difference, and even if the pressure of hot water or water suddenly changes, the automatic pressure regulating valve 3 moves with that pressure, and the two Suita P142 and PC2 of hot water and water are always equal. It acts so that it is maintained. Further, a biasing means 10 is provided on the valve shaft 8, and the biasing means 10 includes a bobbin 11 connected to the end of the valve shaft 8, a coil 12 wound on the bobbin 11 and insulated, and a coil 12 and a coil]2. It has a permanent magnet 13 arranged in a sandwiching manner, and the coil 12 is connected to a control means 18 via a flexible part 14. When a current is passed through the coil 12 from the control means 18, the current crosses the magnetic field generated by the permanent magnet 13, so that a high tension is applied to the valve stem 8 according to Fleming's law. For this reason, the automatic pressure adjustment point is shifted by the amount of high asker, and, for example, the secondary pressures PH2 and PC2 of hot water and water are always regulated at a point where 2=1, and as a result, the temperature of the hot water becomes higher. By changing the current to the coil 12 in this way, the mixed water temperature is changed. The control means 18 superimposes a minute alternating current signal when passing current through the coil 12. (FIGS. 7a and 7b) This is to reduce the hysteresis characteristic 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 for hot water and water. After mixing, the hot water is discharged through a flow regulating on-off valve 20, the temperature of which is determined by a mixing hot water temperature detector (for example, a thermistor) 15, and the flow rate of which is determined by a flow rate detection means. 16, and the control means 18 energizes the bias means 10 and the flow rate adjustment valve driving means 21 to adjust the temperature so as to match the value of the setting means 17. Furthermore, there are conventional flow control valves as shown in Part 8. In FIG. 8, a valve has a coil 22, a plunger 23 that slides inside the coil 22, a first spring 24 that biases the plunger 23 in a direction to push the plunger 23 out, and an inlet passage 25 and an outlet passage 26. There is a housing 27 and a cylinder 28 that slides inside the valve housing 27, and this cylinder 28 has a plurality of adjustment holes 29 and the plunger 2.
It is linked to 3. The flow rate of the liquid flowing from the circumferential direction toward the center of the cylinder 28 is adjusted by the area of the adjustment hole 29 of the cylinder 28 facing the inflow path 25. a piston 31 which is a pressure receiving body 30 provided in the cylinder 28; a valve body 32 which constitutes an opening to the outflow passage 26;
The valve shaft 33 is integrally constructed. The back pressure chamber 35 is separated from the first fire chamber 34 of the inflow passage 25 while leaking slightly from around the piston 31, and the back pressure chamber 35 is connected to the outflow passage 26 downstream of the valve body 32 in the valve shaft 33. A communication hole 37 that communicates with the secondary chamber 36 is provided. The piston 3] has a second piston that urges the valve seat 38 to which the valve body 32 corresponds in the corresponding direction.
A spring 39 is provided. Further, a pilot valve 40 is provided within the valve shaft 33 on the back pressure chamber 35 side to open and close the communication hole 37, and the pilot valve 40 is connected to the plunger 23. When the coil 22 is energized, the plunger 23 is attracted against the biasing force of the first spring 24 and the pilot valve 40
is lifted to open the communication hole 37. At this time, the pressure in the back pressure chamber 35 decreases, and the piston 31 is pushed up by the pressure difference between the back pressure chamber 35 and the first fire chamber 34, overcoming the second spring 39, and at the same time, the valve body 32 is released from the valve seat 38. outflow passage 26
An opening is formed. When the energization to the coil 22 is further increased, the lift amount of the pilot valve 40 increases, and the cylinder 2
8 is lifted, and the adjustment hole 8 of the cylinder 28 is aligned with the inflow passage 25.
, the flow rate of the fluid flowing from the circumferential direction toward the center of the cylinder 28 begins to increase, that is, the coil 2
By adjusting the value of the current flowing through the cylinder 28, a change in the lift amount of the cylinder 28 results in a change in the area where the adjustment hole 29 of the cylinder 28 faces the inlet passage 26, and the flow rate of the fluid is adjusted. - The control means 41 superimposes a minute alternating current signal when passing current through the coil 22. (Fig. 7 a, b) This is coil 2
This is to reduce the hysterinous characteristic of the magnetic circuit consisting of the plunger 2 and the plunger 23 and the sliding resistance at the start of driving. Problems to be Solved by the Invention However, in the hot water mixing control device configured as described above, the minute alternating current superimposed on the coil current is constant regardless of the magnitude of the coil current, so the superposition may vary depending on the characteristics of the mixing valve, flow rate, and pressure. The mixing valve generated resonance vibration or hunting due to the minute AC signal being generated. The present invention solves such conventional problems, and the first aspect of the present invention is to operate the mixing valve stably and quickly by changing at least one of the amplitude or frequency of the superimposed AC signal according to the magnitude of the coil current. purpose. Furthermore, in the flow control valve configured as described above, the minute alternating current superimposed on the coil current is constant regardless of the magnitude of the coil current, so the minute alternating current superimposed on the coil current is constant depending on the characteristics of the flow control valve, the flow rate, pressure, etc. The flow control valve generated resonance vibration or hunting due to the AC signal. A second object of the present invention is to operate the flow control valve stably and quickly by changing at least one of the amplitude or frequency of the superimposed alternating current signal in accordance with the magnitude of the current of the electromagnetic force generating means. Means for Solving the Problems In order to achieve the first object, the hot water mixing control device of the present invention includes a hot water flow path, a water flow path, and a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path. , a mixing valve drive means for driving the mixing valve, a control means for outputting a drive signal to the mixing valve drive means, and a drive signal detection means for detecting a drive signal from the control means to the mixing valve drive means. The control means includes alternating current signal generating means for changing at least one of amplitude or frequency according to the signal from the drive signal detecting means and superimposing an alternating current signal on the drive signal. Further, in order to achieve the second object, the flow control valve of the present invention includes an electromagnetic force generating means, a valve casing having an inflow passage and an outflow passage, and the inside of the valve face body being slid by the biasing force of the B111 force generating means. The cylinder comprises a cylinder that moves to adjust the flow rate, and a control means that adjusts the current of the electromagnetic force generation means, and the control means changes at least one of amplitude or frequency depending on the value of the current to the electromagnetic force generation means. The configuration includes AC signal generating means for superimposing an AC signal on a drive signal. Operation The hot water mixing control device of the present invention has the above-described configuration, and changes one of the amplitude and frequency of the superimposed alternating current signal according to the signal of the drive signal detection means. N'a of force generating means
At least one of the amplitude or frequency of the superimposed alternating current signal is changed depending on the value. EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that FIG. 1 is a sectional view of the hot water mixing control device, and the same parts as in FIG. 6 are given the same numbers. Reference numeral 42 denotes an urging means, and the automatic pressure regulating valve 3 and the urging means 42 form a mixing valve 43. Reference numeral 44 denotes a mixing valve driving means that opposes the force of the urging means 42 and applies a variable high clearance. Mixing valve driving means 4
4 has a plunger 45 made of a magnetic material, and two waterproof and insulated coils 46 around the plunger 45, and the coils 46 are connected to the control means 18. The magnitude of the drive signal sent from the control means 18 to the coil 46 is checked by the drive signal detection means 47. The mixed water temperature is detected by a mixed water temperature detection means 15. The flow rate is detected by flow rate detection means 16. FIG. 2 shows an example of the control means 18. 48 is a main control means, 49 is an AC signal generating means, 50 is a first drive amount setting means, and 5] is a second drive amount setting means. Next, the operation of the configuration of the present invention will be explained. When a current is applied to the coil 46 from the control means 18, the plunger 45 made of a magnetic material moves to the valve stem 8 according to Fleming's law.
Give Paisuka to. This pie skirt and biasing means 4
The automatic pressure regulating valve is balanced when the biasing forces are balanced. Therefore, by changing the current flowing through the coil 46, the balance point of the automatic pressure regulating valve 3 can be moved. For example, when the current is small, the force of the biasing means 42 is stronger, so the water side valve body 6 opens more than the hot water side valve body 4, and the hot water outlet temperature becomes lower. When the current is increased, the plunger 45 is pushed out against the force of the biasing means 42, so that the hot water side valve body 4 begins to open, and as a result, the temperature of the tapped water increases. In this way, the control means 18 controls the mixed hot water temperature detection means 15.
By inputting this signal and the signal from the setting means 17, the current flowing through the coil 46 is varied and the mixing valve 43 is adjusted so that the temperature of the tapped water becomes the set temperature. The temperature-adjusted mixed hot water passes through the mixing section 19, and the mixed hot water temperature detection means 15 detects the hot water temperature. At this time, if the current flowing through the coil 46 is a direct current, it is possible to quickly move the mixing valve 43 to adjust the temperature of the mixed water due to the hysteresis characteristics of the mixing valve driving means 44 consisting of a magnetic circuit and the sliding resistance at the start of driving. difficult. Furthermore, even if an AC signal with a constant amplitude and a constant frequency is simply superimposed on the current flowing through the coil 46, the hysteresis characteristic of the mixing valve driving means 44 consisting of a magnetic circuit and the sliding resistance at the start of driving will be reduced. The signal may cause resonance vibration of the mixing valve 43. Means for preventing the above phenomenon will be explained below. The characteristics of the mixing valve 43 differ slightly depending on its shape and the like. Therefore, the sensitivity varies depending on the drive current, and the influence of the superimposed AC signal is not constant. Therefore, the drive signal to the mixing valve drive means (coil) 46 is detected by the drive signal detection means 47, and an output is passed to the main control means 48 according to the detected value. A signal is sent to the generating means 49 to change the amplitude and frequency of the alternating current signal superimposed on the drive current. The output of the AC signal generating means 49 is input to the first drive amount setting means to be superimposed on the drive signal. For example, when using a mixing valve that has high sensitivity when the drive current is small and low sensitivity when the drive current is large,
), an AC signal approximately proportional to the drive current is superimposed. The combined drive current is as shown in FIG. 3(b). Also, when using a mixing valve that has high sensitivity when the drive current is large and low sensitivity when the drive current is small, see Figure 3 (C).
An AC signal that is approximately inversely proportional to the drive current is superimposed as shown in the figure below. The combined drive current is as shown in FIG. 3(d). Furthermore, when using a mixing valve that has high sensitivity when the drive current is approximately medium, and low sensitivity when the drive current is maximum and minimum, Figure 3 (
An AC signal such as e) is superimposed. The combined drive current is as shown in Figure 3). On the other hand, when using a mixing valve that has high sensitivity at maximum and minimum drive currents and low sensitivity at approximately intermediate drive currents, the
An AC signal like (2) is superimposed. The combined drive current is as shown in FIG. 3(h). In this way, the amplitude of the superimposed alternating current signal can be freely changed according to the drive current using the signal from the main control means. Therefore, resonance of the mixing valve is suppressed and the most efficient AC signal is superimposed, so that the mixing valve can be operated stably and quickly. In the above embodiment, only the amplitude of the superimposed AC signal is changed, but the frequency may be changed, or both the amplitude and frequency may be changed simultaneously. Further, the control means uses the second driving amount setting means 51 to drive the flow rate adjustment on-off valve driving means 21 to adjust the flow rate. In normal use, when the water pressure fluctuates, the automatic pressure regulating valve 3 operates as before, and if the pressure-receiving areas of the hot water side valve body 4, water side valve body 6, and piston 9 are made equal, the secondary pressure PH
2 and PC2 maintain the state at the balance point by the biasing means 42 and the driving means 44. Next, one embodiment of a flow control valve will be described with reference to the drawings. Note that FIG. 4 is a sectional view of the flow control valve, and the same parts as in FIG. 8 are designated by the same numbers. Electromagnetic force generating means 52 by coil 22 and plunger 23
is formed. The flow rate is detected by flow rate detection means 53. 54 is a setting means for setting the flow rate. FIG. 5 shows an example of the control means 41. 55 is the main control means
56 is an AC signal generating means, and 57 is a driving amount setting means. Next, the operation of the configuration of the present invention will be explained. The flow rate is adjusted by the current flowing through the electromagnetic force generating means 52 in the same way as explained in the related art. The control means 41 inputs the signal from the flow rate detection means 53 and the signal from the setting means 54 to vary the current flowing through the electromagnetic force generation means 52 so that the flow rate becomes the set flow rate, changes the lift amount of the cylinder 2, and controls the cylinder. The flow rate of the fluid is adjusted by changing the area of the 28 adjustment holes 29 facing the inflow path 25. At this time, if the current flowing through the electromagnetic force generating means 52 is a direct current, the cylinder 2
It is difficult to move 8 quickly and adjust the flow rate. Furthermore, even if an alternating current signal with a constant amplitude and a constant frequency is simply superimposed on the current flowing through the electromagnetic force generating means 52, the hysteresis characteristic of the magnetic circuit and the sliding resistance at the start of driving will be reduced, but the regular alternating current signal will reduce the valve body. 32 resonance vibrations may be generated. Means for preventing the above phenomenon will be explained below. Flow control valves have slightly different characteristics depending on their shape and other factors. Therefore, the sensitivity varies depending on the drive current, and the influence of the superimposed AC signal is not constant. Therefore, the main control means 55 sends a signal to the AC signal generation means 56 in accordance with the output to the drive amount setting means 57 (in accordance with the current value to the electromagnetic force generation means 52), and superimposes it on the drive current. Change the amplitude and frequency of the AC signal. The output of the AC signal generating means 56 is input to the driving amount setting means 57 in order to be superimposed on the driving signal. For example, when using a valve body that has high sensitivity when the drive current is small and has low sensitivity when the drive current is large, as shown in Figure 3 (a)
An AC signal approximately proportional to the drive current is superimposed as shown in the figure below. The combined drive current is as shown in FIG. 3(b). In addition, when using a valve body that has high sensitivity when the drive current is large and low sensitivity when the drive current is small, an AC signal that is almost inversely proportional to the drive current is superimposed as shown in Figure 3 (C). do. The combined drive current is as shown in FIG. 3(d). Furthermore, when using a valve body that has high sensitivity when the drive current is approximately medium and low sensitivity when the drive current is maximum and minimum,
) to superimpose an AC signal such as The combined drive current is as shown in FIG. 3(f). On the other hand, when using a valve body that has high sensitivity when the drive current is maximum and minimum, and low sensitivity when the drive current is approximately intermediate, the The driving current is as shown in Fig. 3, etc. In this way, the amplitude of the superimposed alternating current signal can be freely changed according to the drive current using the signal from the main control means 55. Therefore, resonance of the valve body 32 is suppressed and the most efficient AC signal is superimposed, so that the valve body 32 can be operated stably and quickly. In the above embodiment, only the amplitude of the superimposed AC signal is changed, but the frequency may be changed, or both the amplitude and frequency may be changed simultaneously. Further, in the above embodiment, a coil and a blanket are used as the electromagnetic force generating means, but a structure using a coil and an iron core may be adopted in which a magnet is provided in the cylinder and the biasing force is transmitted in a non-contact manner. Effects of the Invention As described above, the hot water mixing control device of the present invention includes a hot water flow path, a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, and a mixing valve drive that drives the mixing valve. a control means for outputting a drive signal to the mixing valve drive means; and a drive signal detection means for detecting a drive signal from the control means to the mixing valve drive means, and the control means outputs a drive signal to the mixing valve drive means. The AC signal generation means changes at least one of the amplitude or the frequency according to a signal from the means and superimposes an AC signal on the drive signal, and the amplitude of the superimposed AC signal can be freely changed according to the magnitude of the drive current. Can change. Therefore, it has the following effects. (1) Since the alternating current signal superimposed on the drive signal can be changed, stable valve operation can be achieved by removing the alternating current signal that resonates with the mixing valve. (2) Depending on the position of the mixing valve, the most efficient AC signal can be superimposed, so the mixing valve can operate stably and quickly. (3) By detecting the drive signal and feeding it back to the control means, the drive amount can be adjusted reliably. Further, the flow control valve of the present invention includes an electromagnetic force generating means, a valve casing having an inflow path and an outflow path, and sliding inside the valve casing by the urging force of the electromagnetic force generating means to adjust the flow rate. It consists of a cylinder and a control means for adjusting the current of the electromagnetic force generation means, and the control means changes at least one of amplitude or frequency depending on the current value to the electromagnetic force generation means and superimposes an AC signal on the drive signal. The AC signal generator is configured to include AC signal generating means, and the amplitude of the superimposed AC signal can be freely changed according to the magnitude of the drive current. Therefore, it has the following effects. (4) Since the alternating current signal directly superimposed on the drive signal can be changed according to the magnitude of the drive current, stable valve operation can be achieved except for the alternating current signal that causes resonance of the valve body. (5) Since the most efficient AC signal can be superimposed depending on the position of the valve body, it is possible to operate the valve body stably and quickly to perform predetermined flow rate control.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water mixing control device according to an embodiment of the present invention, FIG. 2 is a control block diagram of the device, FIG. 3 is an output characteristic diagram of the AC signal generating means of the device, and FIG. Cross-section V of a flow control valve according to an embodiment of the present invention, FIG. 5 is a control block diagram of the same flow control valve, FIG. 6 is a cross-sectional view of a conventional hot water mixing control device, and FIG. 7 is a conventional AC signal characteristic. FIG. 8 is a sectional view of a conventional flow control valve. ■...Hot water flow path, 2...--Water flow path, 18...
...Control means, l9...Mixing section, 43...
... Mixing valve, 47 ... Drive signal detection means, 5
2... Electromagnetic force generating means. Name of agent Patent attorney Shigetaka Awano Figure 1 (α) (C! Means (bl (force diagram (eJ # small exchange of electric power Cf))

Claims (1)

[Claims] A hot water flow path and a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, a mixing valve drive means that drives the mixing valve, and a control means that outputs a drive signal to the mixing valve drive means. and drive signal detection means for detecting a drive signal from the control means to the mixing valve drive means, and the control means changes at least one of amplitude or frequency according to the signal of the drive signal detection means, and detects the drive signal. A hot water mixing control device having an alternating current signal generating means for superimposing an alternating current signal on the water.