JPH071064B2 - Hot water mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is designed to drive a mixing valve for mixing hot water and water to freely change a mixing ratio of the hot water and water, thereby arbitrarily setting a predetermined temperature. The present invention relates to a hot and cold water mixing device capable of obtaining mixed water.

[Conventional technology]

Conventionally, a hot and cold water mixing apparatus is known in which hot water and water valves are appropriately adjusted to obtain hot water at a desired temperature. Since this type of mixing device is accompanied by manual operation, it takes time to discharge the appropriate temperature of the mixed water, and a considerable amount of hot water is unnecessarily drained before the mixed water is obtained, which is uneconomical. there were.

Therefore, as an apparatus for automatically mixing the hot water and the water, for example, a wax (heat-sensing agent) previously enclosed in a case having a hot water flow path, a cold water flow path, and a mixed water flow path communicating with both flow paths. Temperature sensing element equipped with a shaft rod that appears and disappears from the entrance and exit due to thermal expansion and contraction, a control valve that maintains the temperature of the mixed water at a set temperature by the operation of the temperature sensing element, and this control valve moves in a linear direction There is commercially available a hot and cold water mixing valve having a so-called automatic temperature control function, which is provided with an operation unit for setting the temperature of the mixed water to be discharged. This hot and cold water mixing valve is convenient because it is convenient to automatically obtain an appropriate temperature mixed water without operating the valve by setting the operating part to the position where the desired hot water temperature can be obtained. Although it repeatedly expands and contracts, its response speed is relatively slow, and as a result, when the tapping temperature is changed, the temperature change becomes slow to follow, and hot water or cold water may be discharged for a certain period of time. Further, for example, when using only tap water for cooking or washing during the summer, it is difficult to cause the shaft rod to completely follow the contraction of the wax even if the wax contracts. There is a risk that it will be difficult to completely close the flow path, and the hot water will be uselessly leaked.

[Problems to be Solved by the Invention]

In order to solve the above problems, an electronic hot and cold water mixing device has been recently developed. As this mixing device, for example, as shown in FIG. 9, a hot water supply pipe 2 connected to a water heater 1 and a water supply pipe 4 connected to a water supply source 3 are connected to a hot water mixing valve 5, and the mixing valve 5 is connected. The mixed water temperature detection sensor 9 installed in the mixing pipe 6 and the switching valve 8 that switches the mixed water of hot water and water to the shower 7 or the currant (faucet) 7a through the mixing pipe 6 to discharge the water. When preparing and tapping,
When the hot water temperature is set by the operation unit 10, the deviation between the hot water temperature detected by the mixed water temperature detection sensor 9 and the set temperature is selected by the control unit 13, and the selected output signal is output by the hot water mixing valve 5. It is sent to the drive unit 11, and the drive unit 11 drives the valve body of the hot and cold water mixing valve 5 to adjust and set the degree of opening and closing of the valve opening. The hot and cold water mixing apparatus is configured to be adjusted so as to reach the hot water discharge temperature, and the mixed water is discharged from the shower 7 or the currant 7a through the switching valve 8 in which the water discharge passage is set by a command from the drive unit 12. 14 is well known.

An electric motor is usually used for the drive units 11 and 12 for driving the valve bodies of the hot and cold water mixing valve 5 and the switching valve 8.
This electric motor is generally attached to the outside of each of the valves 5 and 8 to drive the valve element in the valve device to open / close the valve port and switch the flow path.

However, since the electric motor is installed outside the valves 5 and 8 so that the current-carrying part (for example, coil) does not come into contact with hot water or water, the electric motor is driven with the valve element inside the valves 5 and 8. The rotating shaft of the connected electric motor is watertightly inserted into the wall of each of the valves 5 and 8 through a sealing member such as an O-ring or packing. Therefore, when the valve element is driven, the seal member is attached to the rotary shaft by a constant pressure in order to prevent water leakage, so that the seal pressure is resisted, that is, the sliding friction with the seal member is overcome. Since the valve element needs to be driven, there is a problem that an electric motor having a large driving torque is required.

If a power failure occurs while the hot and cold water mixing valve 5 is being used, the electric motor cannot close the valve port because the valve body of the hot and cold water mixing valve 5 is held at the hot water discharge temperature position. Even if only the water supply is required, the mixed water having the set hot water temperature is discharged, and there is a problem that the hot water in the water heater 1 is unnecessarily used.

In view of the above problems, the present invention adopts a method of linearly reciprocally driving a valve body by a solenoid, and an object thereof is to electrically control a plunger of a solenoid that drives the valve body, It is an object of the present invention to provide a hot and cold water mixing apparatus in which the degree of opening and closing of a valve opening can be changed quickly and reliably by the valve body according to the hot water temperature of the mixed water to obtain mixed water at a predetermined temperature.

[Means for Solving the Problems]

The present invention relates to a valve drive unit including a linear solenoid, a mixing valve unit that is directly linearly attached to a lower portion of the valve drive unit to mix hot water and water, and a control device that drives and controls the valve drive unit. The valve drive unit includes a plunger having a drive shaft protruding downward, a fixed core arranged in the axial direction of the plunger, and a coil wound outside the fixed core. The mixing valve part is in contact with and separable from a valve main body having therein a mixing chamber for communicating the hot water / water inlets and the mixed water outlet with each other, and a drive shaft passing through the valve drive part. And a valve body attached to the spool to open and close a valve port that connects the hot water / water inlets and the mixed water outlet to each other. In addition, the control device has a standard configuration from a sawtooth wave generation circuit. The sawtooth wave output to the valve is compared with the output from the mixed water temperature detection circuit that detects the temperature of the mixed water, and the voltage applied to the coil of the valve drive unit is pulse-controlled, and the plunger of the valve drive unit is controlled. The hot and cold water mixing valve is configured to vary the suction force in proportion to the current flowing through the coil of the valve drive unit.

[Action]

When the coil of the valve drive section of the hot and cold water mixing valve is not energized, the valve body of the mixing valve section closes the valve opening in the mixing chamber to prevent hot water from flowing out, and the coil of the valve drive section is energized. In this case, the sawtooth wave output from the sawtooth wave generation circuit of the control device is compared with the output corresponding to the detected temperature of the mixed water output from the mixed water temperature detection circuit, and the voltage applied to the valve drive section is compared. Is pulse-controlled according to the preset hot water temperature of the mixed water, the plunger is moved to the fixed iron core side by the suction force proportional to the current flowing in the valve drive section, and the spool is driven by the moving distance of the plunger to the drive shaft. The valve opening is pushed by the valve body to set the opening degree for securing the flow rate of the hot water obtained by the mixed water having the preset hot water temperature, and the hot water is caused to flow into the mixing chamber from the valve opening. Flow into the mixing chamber Since it is configured to obtain the mixed water of the preset hot water temperature by mixing with the cold water, it becomes possible to quickly and reliably discharge the mixed water of the hot water temperature corresponding to the set temperature. The current flowing through the valve drive section is pulse-controlled by the control device so that the current corresponding to the hot water temperature of the mixed water is supplied, so that the opening degree of the valve opening of the mixing chamber is set to the set temperature of the mixed water. When the set value of the hot water temperature can be maintained and the set value of the hot water is changed, a current corresponding to the changed set temperature is pulse-controlled to flow through the valve drive unit in response to a command signal from the control device. The opening degree of can be immediately changed to obtain mixed water having a desired tapping temperature. Moreover, since the attraction force of the plunger of the valve drive unit is obtained in proportion to the electric current that is pulse-controlled in the valve drive unit, the plunger does not require a particularly large attraction force,
Since it can be moved to a predetermined position quickly and reliably with a small amount of power, the valve drive unit can be made smaller and lighter, and in the event of a power failure, the suction force of the plunger is canceled,
A feature of the plunger is that it immediately returns to its original position and closes the valve opening to prevent unnecessarily outflow of hot water during a power failure.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a configuration diagram schematically showing a usage state of the hot and cold water mixing apparatus according to the present invention, and the same reference numerals as those shown in FIG. 9 denote the same parts.

In FIG. 1, reference numeral 15 is a water supply pipe, which is branched into two directions in the middle of the pipe, one is connected to a water heater 1 and the other is connected to a hot water mixing valve 16, and 17 is a water heater 1 and a hot water mixing valve 16. A hot water supply pipe that connects the hot water mixing valve 16 and the runner 18a.
A mixed water temperature sensor (hereinafter referred to as a temperature detection sensor) 19 that detects the temperature of the mixed water is attached in the middle of the mixed water pipe connected between the two.
Sent to 20. Further, 21 is a hot water temperature detection sensor provided in the middle of the hot water supply pipe 17 (hereinafter referred to as hot water detection sensor)
Then, the detection signal is also sent to the control device 20. In FIG. 1, 22 is a pressure reducing valve, 23 is a safety valve, 24 is a drainage drain, and 25 is a drainage drain.
Is a water cock.

Next, the structure of the hot and cold water mixing valve 16 will be described with reference to FIG.

In FIG. 2, reference numeral 26 denotes a valve drive part of the hot and cold water mixing valve 16,
Reference numeral 41 also shows the mixing valve portion of the mixing valve 16, and both members 2
When 6, 41 are fastened to the central portion in the vertical direction via a heat insulating material 42 with a fastening bolt (see FIG. 4) 43, they are connected and fixed in a straight line in the vertical direction.

As shown in FIG. 2, the valve drive unit 26 of the hot and cold water mixing valve 16 uses a linear solenoid capable of arbitrarily changing the suction force in proportion to the energizing current.
The drive shaft 2 loosely fitted in the through hole 28a of the fixed iron core 27 via the bearing.
8, the plunger 29 protruding downward, and the plunger 29
And a guide tube 30 made of a magnetic material for accommodating and guiding, and a connection tube 31 made of a non-magnetic metal such as brass for connecting and fixing the guide tube 30 and the fixed iron core 27 at a position on the same axis, and the guide. Cylinder
On the outside of 30 and the fixed iron core 27, the coil 32 wound over both members 30, 27 in a state where the center in the height direction is substantially aligned with the center position in the axial direction of the connecting cylinder 31,
Magnetic metal case 33 loosely fitted to the outside of the coil 32
And an auxiliary iron core 34 that also functions as a cap of the case 33 attached by using a tightening screw 33a on the upper open end of the case 33.
It is composed of and. Further, the fixed iron core 27 and the plunger 29, through holes 35 for filling the guide tube 30 with hot water, are respectively perforated to be communicable,
Spacers 36 made of non-magnetic metal are interposed between the fixed iron core 27 and the lower end of the plunger 29, and between the upper end of the plunger 29 and the auxiliary iron core 34. Further, an O-ring 37 is watertightly sandwiched at the boundary between the upper end of the guide cylinder 30 and the case 33 to prevent the hot water from leaking to the coil 32 side.

Next, the structure of the mixing valve portion 41 will be described with reference to FIG.

The mixing valve unit 41 has a hot water inlet 44 and a cold water inlet 45 on one side.
And a valve body 47 provided with an outflow port 46 through which mixed water of hot water flows out, and an inflow port 4 provided in this valve body 47.
A mixing chamber 48 that connects 4,45 and the outlet 46, and an upper end of the mixing chamber 48 that projects toward the fixed iron core 27 and contacts the lower end of the drive shaft 28 to open and close the valve port 49 of the mixing chamber 48 in the center of the body. For example, a valve body 50 made of ceramic or hard rubber having excellent heat resistance is fitted, a large-diameter space 51 is bored in the lower end, and a small diameter is formed at its side and lower ends. A buffer piston 52 having holes a and b opened is screwed into the spool 53, and the spool 53 is loosely fitted into the mixing chamber 48 so as to be movable together with the drive shaft 28. A closed nut 55 having a recessed hole 54 for slidingly guiding the lower end of the buffer piston 52, and an inner end of the closed nut 55 and a valve body.
And a compression spring 56 that is interposed between the valve body 50 and always presses and urges the valve body 50 in the direction of closing the valve port 49. The valve drive section
When the 26 is mounted and fixed in a straight line, the spool 53 becomes a compression spring.
With the valve opening 50 closed by the valve body 50 by being biased by 56,
The drive shaft 28 and the drive shaft 28 come into contact with each other at a position on the same line.

Reference numeral 60 in FIG. 2 denotes an operating rod for manually operating the spool 53, which has a semicircular locking step portion 61 at the tip, and which extends from the upper side of the mixed water outlet 46 to the wall of the valve body 47. The body is made to penetrate in a watertight manner to project into the mixing chamber 48, and the locking step portion 61 of the operating rod 60 is provided.
When the operating rod 60 is rotated by engaging with the engaging recess 62 cut out in a U shape along the axial direction of the spool 53 in the center of the spool 53, the spool 53 operates against the force of the compression spring 56. The valve port 49 can be manually opened by descending within the radius of the rod 60.

Next, the configuration of the control device 20 for driving and controlling the valve drive unit 26 of the hot and cold water mixing valve 16 will be described with reference to FIG.

The control device 20 is roughly classified into a power circuit 65 and a switch circuit.
66, sawtooth wave generation circuit 67, mixed water temperature detection circuit 68
Drive signal generating circuit 69 and mixed hot water temperature abnormality detection circuit 70
And a hot water temperature detection circuit 71.

The power supply circuit 65 is a transformer Tr in which the primary side is connected to the commercial power supply 72.
And a diode bridge DB with an AC input terminal connected to the secondary side of the transformer Tr, and a constant voltage device AVR connected in series with the DC output terminal of the diode bridge DB,
The smoothing capacitors C, C ₁ connected in parallel to the DC output terminal, and the constant voltage power supply V _cc which is a constant voltage after the commercial power supply 72 is dropped and full-wave rectified is coiled in each of the circuits and the valve drive unit 26. Supply to 32 as operating power.

The switch circuit 66 includes an operation switch 73 inserted between the constant voltage power supply V _cc and the ground resistance R _1, and an RS flip-flop FF having a clock input terminal CL connected to the switch 73. Depending on the input clock signal, the output terminal Q always operates (OF of the operation switch 73
(F state) "H" level signal is output.

The sawtooth wave generation circuit 67 includes an oscillation circuit 67a and an integration circuit 67b, the oscillation circuit 67a includes a comparator A ₁ , the inverting input terminal of which is connected to the output terminal of the RS flip-flop FF via a diode D _1. The output that is set by the time constant of the resistors R ₂ and R ₃ and the capacitor C _{2 in} which the constant voltage power supply V _cc is connected in series between the ground is output from the RS flip-flop FF as the “L” level signal. Is input every time it is output, and the output _divided by the resistors R ₄ , R ₅ , and R ₆ inserted in series between the constant voltage power supply V _cc and the ground is input to the non-inverting input terminal. As a result, a square wave having a constant cycle is output from the output end of the comparator A ₁ by turning on the operation switch 73. Then, the integrating circuit 67b includes an amplifier S _1, connected to its inverting input terminal the output terminal of the comparator A ₁ via a resistor R _7, The non-inverting input terminal is grounded through a resistor R ₉ Therefore, from the output end, resistors R ₈ and R ₇ and capacitor C ₃
The square wave output from the comparator A ₁ is integrated by the time constants of and, that is, a sawtooth wave is output.

Next, the mixed water temperature detection circuit 68, the temperature-voltage conversion circuit 74,
It is composed of a mixed water temperature setting circuit 75, a reference voltage setting circuit 76, and a differential amplifier S ₂ , and the temperature-voltage conversion circuit 74 is a constant voltage power supply.
It is configured by inserting a mixed water temperature detection sensor (hereinafter referred to as a temperature detection sensor, a thermistor is used in this example) 19 and a resistor R ₁₀ in series between V _cc and the ground, and corresponds to the temperature detected by the temperature detection sensor S. The voltage value divided by the resistance value and the resistance R ₁₀ is input to the non-inverting input terminal of the differential amplifier S ₂ via the resistance R ₁₁ , and the mixed water temperature setting circuit 75 uses the constant voltage power supply V
The variable resistor VR and the resistor R _12, R ₁₃ constituted by inserted in series between _cc and ground, from the connection point of the variable resistor VR and the resistor R _12, the voltage corresponding to the set temperature of the mixed water is differential The voltage is input to the non-inverting input terminal of the amplifier S ₂ via the resistor R ₁₄ , and further, the reference voltage setting circuit 76 uses the voltage divided by the resistors R ₁₅ and R ₁₆ as the reference voltage of the mixed water temperature detection circuit 68. It is input to the non-inverting input terminal of the differential amplifier S ₂ . Furthermore, between the inverting input terminal and the output terminal of the differential amplifier S _2, the feedback resistor R ₁₇ to set the amplification degree of the differential amplifier S ₂ is connected. The differential amplifier S ₂ arithmetically amplifies the difference between the temperatures detected by the temperature-voltage conversion circuit 74 and the mixed water temperature setting circuit 75, and outputs it as an analog signal from its output end.

The drive signal generating circuit 69 is composed of a comparator A ₂ and a transistor T, the inverting input terminal of the comparator A ₂ is connected to the output terminal of the differential amplifier S ₂ , and the output from the amplifier S ₂ is input.
The output from the amplifier S ₁ is input to the non-inverting input terminal. On the other hand, the output terminal of the comparator A ₂ is grounded to the base of the transistor T, which is grounded by the emitter, via the resistor R _18, and the collector of this transistor T is connected to the constant voltage power supply V _cc via the coil 32 of the valve drive unit 26. To be done. Then, an output obtained by comparing the outputs of the differential amplifier S ₂ and the amplifier S ₁ is sent from the comparator A ₂ to the transistor T to pulse-drive the transistor T.

Mixed hot water temperature abnormality detecting circuit 70 includes a comparator A _3, the inverted input terminal, a voltage divided by the constant-voltage power supply V _cc and the resistor R ₁₉ and R ₂₀ inserted in series between the ground (This voltage is, for example, a voltage corresponding to a temperature that exceeds the maximum value of the set temperature of the mixed water by about 10%), and the resistance detected by the temperature detection sensor 19 is input to the non-inverting input terminal. The voltage divided by the value and the resistance R ₁₀ is input. The output terminal of the comparator A ₃ has an anode connected to the constant voltage power supply V _cc.
Is a connection point a between the comparator A ₂ and the transistor T and a resistor R _21.
The cathode of the diode D ₂ connected through is connected, and the "H" level signal is always output.

The hot water temperature detection circuit 71 includes a temperature-voltage conversion circuit 77 including a resistor R ₂₁ and a hot water temperature detection sensor (hereinafter referred to as hot water detection sensor) 21 that are inserted in series between a constant voltage power supply V _cc and ground.
And a reference voltage setting circuit 78 configured by inserting resistors R ₂₂ and R ₂₃ in series between the constant voltage power supply V _cc and the ground, and a comparator A _{4, which} is connected to the inverting input terminal of the comparator A _4. Is a hot water sensor
The voltage divided by the resistance R ₂₁ and the resistance value corresponding to the hot water temperature detected at 21 is input, and the voltage divided by the resistors R ₂₂ and R ₂₃ is input to the non-inverting input terminal (from the water heater 1 A voltage corresponding to a set value when the temperature of the hot water supplied drops to a predetermined temperature) is input. Also, comparator
Similar to the comparator A ₃ , the output terminal of A ₄ is connected to the constant voltage power supply V _cc via the diode D ₃ , the connection point a, and the resistor R ₂₁ and always outputs the “H” level signal. .

In FIG. 1, 80 is a variable resistor VR volume,
Reference numeral 81 is a scale for displaying the temperature at which the mixed water flows out.

Next, the operation will be described.

In using the hot and cold water mixing valve 16, the operation switch 73 of the control device 20 is turned on and, at the same time, the volume 80 is operated (see VR in FIG. 8) to display the hot water temperature of the hot water mixed from the calan 18a. Set to the desired temperature position. When the Karan 18a is opened in this state, the water remaining in the mixed water pipe 18 is discharged. When the operation switch 73 is turned on, an “L” level signal is output from the output terminal of the RS flip-flop FF, and based on this signal, a sawtooth wave-shaped output is output from the sawtooth wave generation circuit 67 and a drive signal generation circuit 69. Is input to the non-inverting input terminal of the comparator A ₂ of
(See fig 67). On the other hand, the temperature detection sensor 19 inserted in the mixed water pipe 18 detects the water temperature in the mixed water pipe 18, and the output corresponding to the water temperature is input from the temperature-voltage conversion circuit 74 to the non-inverting input terminal of the differential amplifier S _2. To be done. Further, an output corresponding to the hot water temperature of the mixed water set by the volume 80 is input from the mixed water temperature setting circuit 75 to the inverting input terminal of the differential amplifier S ₂ . The differential amplifier S ₂ amplifies the difference voltage between the inputs from both the circuits 74 and 75 by a predetermined set value and outputs it as an analog signal from the output terminal thereof, and the comparator A ₂ of the drive signal generating circuit 69.
Is input to the inverting input terminal (see S _{2 in} FIG. 8). The comparator A ₂ of the drive signal generating circuit 69 is a sawtooth wave generating circuit.
The output from 67 is compared with the output from the mixed water temperature detection circuit 68, and pulse signals of "H" level and "L" level are alternately output from the output terminal of the comparator A ₂ , and the transistor T is pulsed as described above. ON / OFF control by.

However, when the operation switch 73 is turned on, the temperature difference between the set temperature of the mixed water and the water temperature in the mixed water pipe 18 detected by the temperature detection sensor 19 is relatively large. The level signal is continuously output for a certain period of time to keep the transistor T in the ON state, and the coil 32 of the valve drive 26 of the hot and cold water mixing valve 16 is supplied with the constant voltage power source V _cc to start energization.

When the coil 32 is energized, the plunger 29 is moved by the magnetic flux (the arrow shown by the solid line in FIG. 6) flowing from the guide cylinder 30 of the valve drive unit 26 through the plunger 29 to the fixed iron core 27 as shown in FIG. It is rapidly attracted to the fixed iron core 27 side as shown by the alternate long and short dash line. In this case, the plunger 29 is not attracted to the fixed iron core 27 even though a high voltage is applied to the coil 32, because the auxiliary iron core 34 also serving as the cap of the case 33 is provided above the plunger 29. is there. That is, the magnetic flux generated by energizing the coil 32 flows from the guide tube 30 to the plunger 29 as described above, and the magnetic flux flowing through the plunger 29 is divided into the fixed iron core 27 side and the auxiliary iron core 34 side. Therefore, when the plunger 29 is attracted to the fixed iron core 27 side,
When the force to attract the plunger 29 is exerted on the side of the auxiliary iron core 34, and the force of attracting the plunger 29 also acts on the side of the auxiliary iron core 34, the plunger 29 is rapidly moved to the side of the fixed iron core 27 but is absorbed. There is no such thing.

Further, in the present invention, since the attraction force acting on the plunger 29 acts on the fixed iron core 27 side rather strongly than on the auxiliary iron core 34 side, the plunger 29 before the plunger 29 is actuated
G between the lower end of the core and the upper end of the fixed iron core 27
Is set to be located approximately in the middle between the center of the coil 32 in the height direction and the lower end of the coil 32. Therefore, when the coil 32 is energized, the plunger 29 moves to the auxiliary core 34.
In the state where the suction force on the side is completely shaken off, the fixed iron core 27 is moved by the suction force proportional to the energized current that is pulse-controlled.
When the plunger 29 moves to the fixed iron core 27 side, the drive shaft
28 also descends at the same time and pushes down the spool 53 loosely fitted in the mixing chamber 48 of the valve body 47 against the force of the compression spring 56. For this reason, the valve body 50 fitted on the spool 53 descends downward and the valve opening
Open 49 relatively large. When the valve port 49 is opened, the hot water and the water heater 1 flowing from the water heater 1 through the hot water supply pipe 17 → the hot water inlet 44 into the void in the valve drive unit 26 from the upper portion of the valve port 49 of the mixing chamber 48. The hot water flowing directly from the outlet flows into the mixing chamber 48 below the valve port 49, is mixed with the cold water that has already flowed into this mixing chamber, and flows from the mixing water outlet 46 of the valve body 47 through the mixing water pipe 18 to the currant 18a. It becomes mixed water and is discharged. The temperature of the mixed water flowing from the valve body 47 into the mixed water pipe 18 is sequentially detected by the temperature detection sensor 19, and the detection signal is input to the differential amplifier S ₂ . In this case, since the valve port 49 is opened relatively large, the inflow of hot water into the mixing chamber 48 increases, and the mixed water in the vicinity of the outlet port 46 of the valve body 47 is temporarily slightly above the set temperature of the mixed water. It can be high. As a result,
The temperature detected by the temperature detection sensor 19 and the preset temperature of the mixed water are reversed, and the differential amplifier S ₂ outputs an analog signal for lowering the temperature of the mixed water (Fig. 8). 19, S ₂ ). When the signal from the differential amplifier S ₂ is input, the drive signal generation circuit 69 compares the output of this signal with the output from the sawtooth wave generation circuit 67, and outputs “H” from the output terminal of the comparator A _2. By shortening the output time of the level signal and lengthening the output time of the “L” level signal, the on time of the transistor T is limited, and the voltage applied to the coil 32 of the valve drive unit 26 is reduced. The current flowing through the coil 32 is reduced (see A ₂ , 32 in FIG. 8). The coil 3
As the amount of electricity to 2 decreases, the plunger 2
The suction force of 9 becomes slightly smaller than the above, and it will be returned to the original position side a little. Therefore, the spool 53 is a compression spring.
The force of 56 moves upward following the plunger 29, and the valve body 50 slightly narrows the opening degree of the valve port 49 to reduce the outflow of hot water, and the temperature of the mixed water is made slightly lower than the set temperature. In this way, the width of the pulse signal output from the drive signal generation circuit 69 is varied according to the temperature detected by the temperature detection sensor 19 to shorten or lengthen the on / off time of the transistor T, thereby making the coil 32 The suction force of the plunger 29 is changed by controlling the current flowing through the valve, and the valve body 50 brings the opening degree of the valve opening 49 closer to the opening degree at which the mixed water of the temperature is obtained, and the mixing ratio of hot water and cold water is set. Make sure to obtain a mixed water of temperature (see A _{2 in} Fig. 8).

Then, when the temperature of the mixed water flowing through the mixed water pipe 18 reaches a preset hot water temperature, the drive signal generating circuit 69 outputs a pulse signal for keeping the current flowing through the coil 32 constant to turn on the transistor T. It is controlled to be off, the suction force of the plunger 29 is kept constant, and the valve port 49 is maintained at an opening degree such that the flow rate of the hot water is a mixed water having a preset temperature. That is, the current passed through the coil 32 can be subjected to constant current control by pulse control.
It is possible to keep the amount of hot water flowing constant, and the mixed water in which hot water and water are mixed at the set temperature can be reliably discharged from the currant 18a (see S ₂ , A ₂ , 32 in FIG. 8). .

When an abnormal situation occurs in which the temperature of the mixed water does not drop below the set temperature while the mixed water is being discharged, the output of the detected temperature of the mixed water is the comparator of the mixed hot water temperature detection circuit 70.
When the temperature is input to A ₃ , and the temperature exceeds the preset abnormal temperature setting value, a “L” level signal is output from the output terminal of the comparator A ₃ , and the constant voltage power supply V _cc passes through the resistor R ₂₁ . Flows to the comparator A ₃ . Therefore, the output from the comparator A ₂ of the drive signal generating circuit 69 cuts off the current flowing through the base of the transistor T and turns off the transistor T.
The constant voltage power supply V _cc cannot be supplied to the coil 32 of the valve drive unit 26, and the power supply to the coil 32 is cut off. Accordingly, the suction force of the plunger 29 is canceled, the spool 53 and the drive shaft 28 which are moved upward by the compression spring 56 return to the original position, and the valve port 50 is immediately closed by the valve body 50, so that the mixed water of abnormal temperature appears. Stop doing.

Further, when the amount of hot water discharged from the water heater 1 increases and the temperature of the hot water flowing into the mixing valve section 41 reaches a temperature equal to or lower than a preset temperature, the hot water detection sensor 21 detects this and the detection signal is the comparator A. Entered in ₄ . For this reason, the output end of the comparator A ₄ becomes “L” level and the coil 32 is de-energized, as in the case where the mixed water having the abnormal temperature is about to be discharged.
The valve body 51 closes the valve 49 to prevent wasteful flow of hot water. When the temperature of the hot water drops, the set value of the temperature drop may be variable in advance by using a variable resistor.

Next, when the plunger 29 of the valve drive unit 26 is attracted to the fixed iron core 27 side by the current value supplied to the coil 32 or when returning to the original position side, the plunger 29 of the valve drive unit 26 is fixed in a void space. Since hot water flows in through the through hole 35 provided in the iron core 27 and the plunger 29, the pressure in the void of the valve drive unit 26 and the pressure in the hot water supply pipe 17 are the same, so the plunger 29 is a coil. Since the resistance caused by the pressure difference is not received at all when the attracting force increases or decreases when the energizing current to 32 is varied, the movement can be smoothly and reliably performed with a small amount of power.

In this case, when the temperature of the coil 32 rises due to the inflow of hot water and its resistance value decreases, the energization amount to the coil 32 temporarily increases and the opening degree of the valve port 49 widens, and the inflow amount of hot water increases. However, since the temperature detection sensor 19 can detect this and control the amount of electricity to the coil 32 by the control device 20, it is possible to suppress an abnormal rise in the hot water temperature of the mixed water.

Further, a buffer piston 52 having an empty space 51 therein is attached to the spool 53 that moves together with the movement of the plunger 29. Therefore, when the spool 53 descends, the buffer piston 52 becomes empty. Since the water flowing into the recessed hole 54 of the place 51 and the closed nut 55 is slowly lowered while discharging into the mixing chamber 48 from the small holes a and b, the rapid drop of the spool 53 is The buffering piston 52 is controlled by the slowing down of the descending speed caused by discharging the water from the cavity 51 and the buffering effect generated therewith. Therefore, the chattering phenomenon (a phenomenon in which the spool 53 makes an oscillating motion in the mixing chamber 48) caused by the synergistic effect of the undulation phenomenon caused by the rapid drop of the spool 53 and the urging force of the compression spring 56 can be reliably prevented, and the valve opening By accurately maintaining the opening degree of 49 at a predetermined set value, it becomes possible to constantly maintain a constant flow rate of hot water.

Furthermore, when confirming the amount of hot water passing through the hot water mixing valve 16 at the beginning of use, or when mixed water is required at the time of power failure, the operating rod 60 can be manually rotated in the direction in which the spool 53 descends. The lower end edge of the engagement recess 62 of the spool 53 is pushed downward by the semicircular locking step 61 at the tip of the operating rod 60, and the spool 53 can be pushed down against the force of the compression spring 56. Since the hot water mixing valve 16 of the present invention is configured as described above, the hot water in the water heater 1 can be easily used even during a power failure or the like.

When the operation switch 73 is turned off, the coil of the valve drive unit 26
Since the power to 32 is cut off, the plunger 29
The suction force to the side is eliminated. Then, by the force of the compression spring 56 that constantly urges the spool 53 in the upward direction,
The spool 53 pushes up the valve body 50 to a position where it closes the valve opening 49 to close the valve opening 49 and pushes the plunger 29 back to its original position. As a result, the hot water does not come out when the valve port 49 is closed, and only the cold water can be used. For example, this is convenient because it is possible to use only cold water and avoid wasteful use of hot water at a time when the mixed water is rarely needed in the summer and the like, and it is possible to use the water heater efficiently. There is an advantage to

〔The invention's effect〕

As described above, according to the present invention, the mixing valve portion and the valve driving portion thereof are arranged in a straight line, and the drive shaft in the valve driving portion and the spool of the mixing valve portion are brought into contact with each other on a position on the same vertical line, Since the hot and cold water mixing device is configured so that the spool moves linearly, the movement of the drive shaft is linear, and it can be directly transmitted to the spool without receiving large sliding friction, and the opening degree of the valve opening in the mixing valve can be controlled. It can be set reliably and quickly. Moreover, by operating the spool linearly without any error, it becomes possible to accurately perform fine adjustment of the mixing ratio of hot water and water, the temperature and flow rate of mixed water, and the like.

Further, the present invention, the current flowing through the valve drive portion of the hot water mixing valve,
A controller for driving and controlling the valve drive unit so that the suction force of the plunger of the valve drive unit can be arbitrarily changed in accordance with the hot water temperature of the mixed water by energizing in accordance with the hot water temperature of the mixed water. Is configured, it is possible to arbitrarily change the suction force of the plunger according to the hot water temperature of the mixed water by performing pulse control of the current flowing through the valve drive unit. Since the valve opening of the hot and cold water mixing valve can be accurately controlled by controlling the valve body connected to the hot water mixing valve, the opening degree can be adjusted according to the hot water temperature of the mixed water. It is possible to quickly and reliably obtain mixed water at the required temperature.

Further, according to the present invention, the control device for controlling the drive of the valve drive unit is provided with a valve drive unit of the hot and cold water mixing valve when the mixed water does not drop by rising a certain temperature from the set temperature during the hot water discharge. Since there is a mixed hot water temperature abnormality detection circuit that immediately stops the energization of the mixed water and stops the hot water discharge of the mixed water, as described above, if an abnormality occurs in the hot water temperature of the mixed water, the hot water is immediately stopped and mixed. Since it is possible to prevent the water user from getting burned, the hot and cold water mixing device can be used safely. In addition, in the present invention, even if the discharge of the mixed water is stopped, the cold water inlet and the mixed water outlet are not closed by the valve body and are always in communication with each other, so that the mixing at the set temperature or higher is achieved. Even if the tapping of water is stopped, cold water continues to spout, so by any chance, if mixed water above the set temperature temporarily comes out and if tapping stops immediately, only cold water will spout. Therefore, it is possible to surely prevent the harmful effects caused by the discharge of the mixed water having the abnormal temperature.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the hot and cold water mixing apparatus of the present invention, FIG. 2 is a front view showing the hot and cold water mixing apparatus of the present invention in a longitudinal section, and FIG. 3 shows an operating state of the hot and cold water mixing apparatus. FIG. 4 is a plan view, FIG. 5 is a cross-sectional view taken along the line AA of FIG. 2, FIG. 6 is an explanatory view showing the flow of magnetic flux, and FIG. 7 is a block showing the configuration of the control device. FIG. 8 and FIG. 8 are time charts, and FIG. 9 is a configuration diagram showing an embodiment of a conventional hot and cold water mixing apparatus. 16 …… Hot water mixing valve, 26 …… Valve drive part 29 …… Plunger, 28 …… Coil 41 …… Mixing valve part, 47 …… Valve body 48 …… Mixing chamber, 49 …… Valve 50 …… Valve body

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Claims (1)

[Claims] 1. A mixing chamber provided with an outlet for mixing hot water and water flowing in from an inlet of hot water and an inlet of cold water and flowing out from the outlet as a mixed water of an appropriate temperature, and hot water in the mixing chamber. A valve main body formed by accommodating a valve body that movably closes a circulating valve port and that allows a cold water inflow port and a mixed water outflow port to communicate with each other at all times, and an upper part of the valve main body,
It is equipped with a control device that pulse-controls the current applied to the coil to vary the attraction force of the plunger in proportion to the current flowing in the coil, and allows the plunger to move linearly to the valve body via the drive shaft and spool. The hot water mixing valve is formed by arranging and fixing the valve drive portion formed by contacting with each other in a straight line,
The controller is a sawtooth wave generation circuit that outputs a sawtooth wave in a fixed form, a mixed water temperature detection circuit that detects the hot water temperature of the mixed water that flows out from the outlet of the hot and cold water mixing valve, and an output from the sawtooth wave generation circuit. And the output from the mixed water temperature detection circuit, and outputs a pulse signal corresponding to the voltage applied to the valve drive section, and further, when the mixed water is discharged, the hot water temperature is the set temperature. When the temperature rises above a predetermined temperature, it is detected that the operation of the drive signal generation circuit is stopped, the energization of the valve drive unit is cut off, and the hot water mixing abnormality detection circuit is closed. Composed by
The hot and cold water mixing apparatus is characterized in that the hot and cold water mixing valve is drive-controlled by varying the suction force of the plunger of the valve driving unit in proportion to the current supplied to the valve driving unit.