JPH06159537A - Constant pressure type hot water and cold water combination device - Google Patents

Abstract

PURPOSE:To provide a hot water and cold water combination device which has good responsiveness and a good temperature control function and escapes from a hot/cold water leak between hot water and cold water. CONSTITUTION:In a hot/cold water combination device 10, a pressure of a hot/cold water mixing chamber 22 is controlled to be constant by a pressure control valve 12, and as a result, a flow rate Q of a hot/cold water combination exhausted from the hot/cold water mixing chamber 22 is kept constant. A flow rate of hot water (or cold water) inflow to the hot/cold water mixing chamber 22 is controlled according to the combination temperature by a flow rate control valve 14 provided with a temperature responsive coil spring 58. As the flow rate Q is the total of the hot water flow rate QH and the cold water flow rate QC, (Q=QH+QC), when a flow rate for either of hot water and cold water is controlled, a flow rate for the other is decided.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus having an automatic temperature control function.

[0002]

2. Description of the Related Art A general automatic temperature control type hot and cold water mixing apparatus is provided with a temperature sensitive element in which a heat-expandable wax is enclosed, and when a user turns a temperature setting handle to set a desired hot water supply temperature. The wax temperature sensor responds to the temperature of the hot and cold water mixture to position the mixing valve and automatically adjust the hot and cold water mixing ratio, and the temperature of the hot and cold water mixture is mechanically feedback controlled toward the set value. ing.
When conditions such as water pressure, hot water pressure, hot water temperature from the water heater, tap water temperature, and flow rate fluctuate transiently, and as a result, the temperature of the hot and cold water mixture changes, the wax thermosensitive element expands and contracts according to the temperature change. , The mixing valve body is displaced to correct the mixing ratio of hot and cold water, and the temperature of the hot and cold water mixture is gradually converged to almost the target value while repeating overshoot and undershoot. Although this type of automatic temperature control mixer is widely used,
Since the wax thermosensitive element has a large heat capacity and poor thermal conductivity, it has a drawback that the response to a transient temperature change is slow and a considerable overshoot or undershoot occurs.

In order to improve such a defect of the wax temperature sensitive element, a hot and cold water mixing plug using a temperature sensitive element made of a shape memory alloy has been proposed in the prior art (Jitsuko Sho 61-4).
No. 4062). This hot and cold water mixing valve has a valve body that slides inside the housing, and the valve body is positioned by a balance between a coil spring made of a shape memory alloy and a bias spring made of a usual spring material. The coil spring made of a shape memory alloy expands and contracts according to the temperature of the hot and cold mixture, whereby the valve body is displaced between the fully open position and the fully open position of the hot water to automatically adjust the temperature of the hot and cold mixture.

In this hot and cold water mixing valve, the coil spring as the temperature sensing element is formed of a shape memory alloy, and such an alloy has a smaller heat capacity and a higher thermal conductivity than the wax temperature sensing element. This hot and cold water mixing valve has an advantage that it is more responsive than a hot and cold water mixing device using a wax temperature sensitive element.

However, since the valve body slides along the cylindrical bore of the housing, there is a drawback that hot water leaks through the gap between the outer circumference of the valve body and the inner circumference of the bore. . That is, in the embodiment illustrated in FIGS. 1 and 2 of the publication, a spool valve is used as the valve element, and a lift valve is used in the embodiments of FIGS. 3 and 4. . In any of the valve configurations, in order to allow the valve body to slide smoothly in the housing, a sufficient gap must be provided between the outer circumference of the valve body and the inner circumference of the bore of the housing. I won't. Since there is such a gap, if a pressure difference occurs between the upstream side and the downstream side of the valve body, the hot water or water will leak to the downstream side through the gap. Such a leak of hot and cold water causes the warm water diluted with water to be discharged when the valve body is in the hot water fully open position (hence, the water fully closed position) to supply hot water, and conversely, to supply cold water. When the valve body is in the fully open position of water (hence, the fully closed position of hot water), warm water diluted with hot water is discharged. Therefore, the temperature control function is not sufficient. Further, when hot water is supplied, hot water may leak and the water heater may ignite unnecessarily.

Further, in the embodiment using the lift valve (FIGS. 3 and 4 of the same publication), the valve body is held by the balance between the coil spring made of a shape memory alloy and the bias spring, so that water pressure and When the hot-water supply pressure transiently fluctuates and the hot-water differential pressure fluctuates transiently, the valve body may be unintentionally displaced and the temperature of the hot-water mixture may deviate from the target temperature.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot and cold water mixing apparatus having excellent responsiveness and excellent temperature control function.

Another object of the present invention is to provide a hot and cold water mixing apparatus which prevents leakage of hot water and water and is excellent in shutoff performance of hot and cold water.

Another object of the present invention is to provide a hot and cold water mixing apparatus which is not affected by the transient fluctuation of the hot and cold water pressure.

[0010]

[Constitution of the invention]

The present invention achieves the above object based on a novel principle different from the hot water mixing apparatus of the prior art. That is, generally, the flow rate of the fluid flowing through the pipeline can be expressed by the following equation.

Q = k · Cv · P ^1/2 ··· (1) (where, k is a constant, Cv is a flow coefficient of the pipeline, P is the pressure of the fluid in the pipeline) In this case, it can be considered that the condition of the pipeline downstream of the hot water mixing chamber is constant and the flow coefficient Cv takes a unique value. Therefore, if the pressure P of the hot and cold water mixture in the hot and cold water mixing chamber is kept constant, the flow rate Q of the hot and cold water mixture discharged from the hot and cold water mixing device can be made constant. However, the hot and cold water mixing of the flow rate Q is of the hot water flowing into the hot and cold water mixing chamber the flow rate Q _H and since the sum of the flow rate Q _C of water (Q = Q _H +
Q _C ), in this way, when the mixture flow rate Q is kept constant by keeping the mixture pressure P constant, if the hot water flow rate Q _H increases, the water flow rate Q _C decreases accordingly, and conversely The flow rate Q _{C of} water increases as the flow rate Q _{H of} hot water decreases. Therefore, by controlling only one of the flow rates (Q _H or Q _C ) of the hot water flowing into the hot water mixing chamber, the other flow rate (Q _C or Q _H ) is also controlled, and the mixing ratio Can be changed.

Based on this principle, the present invention (1) makes the pressure P of the hot and cold water mixture in the hot and cold water mixing chamber constant by the pressure control means to make the flow rate Q of the hot and cold water mixture constant,
(2) The mixing ratio of hot and cold water is controlled by controlling the flow rate (Q _H or Q _C ) of either hot or cold water according to the temperature of the hot and cold water mixture by the flow rate control means.

More specifically, the hot and cold water mixing apparatus of the present invention comprises a housing, and the housing has a hot and cold water mixing chamber, and a hot water flow path for supplying hot water under pressure to the hot and cold water mixing chamber.
A water flow path for supplying water under pressure to the hot and cold water mixing chamber and a hot and cold water mixture outlet for discharging the hot and cold water mixture from the hot and cold water mixing chamber are formed. The pressure of the hot and cold water mixture in the hot and cold water mixing chamber is constantly controlled by pressure control means such as a pressure control valve. Therefore, the flow rate Q of the hot and cold water mixture discharged from the hot and cold water mixing chamber becomes constant. Yuryuro (or water flow path) flow rate Q _H (or Q _C) of the hot water through the supplied to the hot and cold water mixing chamber (or water) is controlled by a flow control valve. This flow control valve is provided with a temperature responsive coil spring, and this temperature responsive coil spring is made of a metal whose spring constant changes with temperature, such as a shape memory alloy, and responds to the temperature of the hot and cold mixture. It is placed in the hot water mixing room. The flow control valve preferably comprises a poppet type valve body, which is positioned by the balance of the temperature responsive coil spring and the bias spring. Target temperature of the hot and cold water mixture is set by the temperature setting means, the flow control valve is a temperature of the hot and cold water mixture to control the flow rate Q _H (or Q _C) of the hot water so that the target temperature (or water).

Since the poppet valve does not require a gap between the outer circumference of the valve body and the valve housing, unlike the above-mentioned conventional mixing valve, it effectively shuts off the flow of fluid at the fully closed position and prevents leakage of hot and cold water. Can be prevented.

In the preferred embodiment, the temperature setting means sets the target temperature by adjusting the preload of the bias spring. The preload of the bias spring can be adjusted by manual means, such as a manual handle, or it can be adjusted by electrical means, such as an electric motor controlled by a control circuit.

The above-mentioned features and effects of the present invention, as well as other features and advantages, will be more apparent according to the description of the following embodiments.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a hot and cold water mixing apparatus 10 comprises a pressure control valve 12 and a flow rate control valve 14. Although in the illustrated embodiment the pressure control valve 12 and the flow control valve 14 are incorporated into a common housing 16, they may be separated. The housing 16 has inlets 18 and 20
A hot and cold water mixing chamber 22 is formed. In the illustrated embodiment, the inlet 18 acts as a water inlet, the inlet 20 acts as a hot water inlet, the pressure control valve 12 keeps the pressure of the water supplied from the water inlet 18 to the mixing chamber 22 constant, and the flow control valve. 14
Is designed to control the flow rate of hot water supplied from the hot water inlet 20 to the mixing chamber 22.

The pressure control valve 12 is of the conventional type and has a primary pressure chamber 24, a secondary pressure chamber 26, a valve seat 28 disposed therebetween, a poppet valve 30, and a diaphragm 32. Poppet valve 30 for better closing performance
A rubber packing 34 is attached to the. Diaphragm 3
2 has an effective pressure receiving area equal to the effective pressure receiving area of the poppet valve 30, its outer periphery is liquid-tightly fastened to the housing by a retainer 36 fixed to the housing 16, and its inner periphery is screwed to the poppet valve. A nut 38 is liquid-tightly fastened to a flange 40 of the poppet valve. Nut 3
8 acts as a guide member for the poppet valve 30 and also as a spring receiver for the compression coil spring 42, and is fitted in the retainer 36 so as to be slidable in the axial direction. The upper end of the coil spring 42 is supported by an adjusting screw 44 screwed to the retainer 36, and the preload of the coil spring 42 can be adjusted by rotating the adjusting screw 44. The stroke of the poppet valve 30 is the stopper 46.
Regulated by

Since the effective pressure receiving area of the poppet valve 30 and the effective pressure receiving area of the diaphragm 32 are equal, the primary pressure chamber 2
Due to the primary pressure in 4, the force acting downwards on the poppet valve 30 and the force acting upwards on the diaphragm 32 cancel each other out. Therefore, the poppet valve 30 is connected to the secondary pressure chamber 2
Positioned by the balance between the upward force due to the back pressure in 6 and the downward force due to the coil spring 42, the pressure control valve 12 controls the secondary pressure to a pressure value corresponding to the preload of the coil spring 42. Water having a secondary pressure controlled in this way is applied to the hot and cold water mixing chamber 22 via the water inlet 18.
Since the hot and cold water mixture in the hot and cold water mixing chamber 22 is maintained at a constant pressure P, the flow rate Q (the hot water flow rate Q _{H of the} hot and cold water mixture discharged from the mixture outlet 48 of the hot and cold water mixing apparatus 10 is calculated according to the equation (1). The sum of the water flow rate Q _C and Q = Q _H + Q _C ) is constant. As will be described later, the flow rate Q can be variably adjusted by turning the adjusting screw 44 to adjust the preload of the coil spring 42 and changing the pressure P.

The flow control valve 14 uses many constituent elements having the same structure as the constituent elements of the pressure control valve 12 described above in order to share the parts with the pressure control valve 12. The functions of the elements are not necessarily the same. That is, the flow control valve 14 has the valve seat 50 formed in the housing 16.
A poppet valve 54 with a rubber packing 52 for controlling the flow rate of the hot water from the hot water inlet 20 in cooperation with the valve seat 50; a diaphragm 56 having an effective pressure receiving area equal to the effective pressure receiving area of the poppet valve 54; A temperature responsive compression coil spring 58 for urging the valve 54 in the valve closing direction and a compression bias spring 60 for urging the poppet valve 54 in the valve opening direction are provided. Similar to the case of the pressure control valve 12, the outer periphery of the diaphragm 56 is liquid-tightly fastened to the housing 16 by the retainer 62, and the inner periphery thereof is liquid-tightly attached to the flange 66 of the poppet valve 54 by the nut 64 screwed to the poppet valve. It is tightly bound. As with the pressure control valve 12, the nut 64 acts as a guide member for the poppet valve 54 and also as a spring bearing for the bias spring 60. Therefore, the nut 64 is slidable in the retainer 62 in the axial direction. Is fitted to.

The temperature-responsive coil spring 58 is made of a metal whose spring constant changes according to the temperature, and the mixing chamber 2
A different spring force is generated according to the temperature of the hot and cold water mixture in 2 to act on the poppet valve 54. As such a metal material whose spring constant changes depending on temperature, an alloy made of nickel-titanium alloy or the like and belonging to the category of shape memory alloys is known. The elastic modulus of this type of alloy changes with temperature, and as a result, the spring constant of the coil spring 58 made of a shape memory alloy changes with temperature.

On the other hand, the bias spring 60 is made of a usual spring material, and its spring constant is constant with respect to temperature. Therefore, the biasing force generated by the bias spring 60 is proportional to the preload applied to it. As in the case of the pressure control valve 12, the upper end of the bias spring 60 has a retainer 62.
It is supported by an adjusting screw 68 that is screwed into the shaft, and the preload of the bias spring 60 can be adjusted by rotating the adjusting screw 68.

Next, referring to FIG. 2 and FIG. 3 together, an example of use of the hot and cold water mixing apparatus 10 and the operation of the flow control valve 14 will be described. As shown in FIG. A water pipe can be connected to the pressure chamber 24, and hot water can be supplied to the hot water inlet 20 from a water heater 70 such as an instantaneous water heater connected to the water pipe. Due to the pressure loss of the water heater 70, the hot water pressure applied to the hot water inlet 20 will be slightly lower than the tap water pressure. However, the pressure control by the pressure control valve 12 is performed by making the secondary pressure constant at a value lower than the primary pressure, and the secondary pressure considerably lower than the water pressure is output to the mixing chamber 22, so that the flow control valve is controlled. The pressure at 14 hot water inlet 20 will be higher than the pressure at water inlet 18. Therefore, the hot water flows into the mixing chamber 22 according to the opening degree of the flow control valve 14, and is mixed with the water flowing through the pressure control valve 12. The hot and cold water mixture formed in the hot and cold water mixing chamber 22 can be connected to the currant 74 and the shower via the water stopcock 72.

When the stop cock 72 is opened, hot water and water are mixed by the hot and cold water mixing device 10 and supplied from the calan 74. At this time, the pressure control valve 12 maintains the pressure of the hot and cold water mixture in the hot and cold water mixing chamber 22 at a constant value P as described above. Thus, the pressure P is constant and the outlet 48 of the mixing device 10 is
Since the flow rate coefficient Cv of the further downstream flow path is constant, the flow rate Q of the hot / cold water mixture flowing out from the outlet 48 is constant, as can be seen from the equation (1).

Next, to explain the operation of the flow control valve 14, the effective pressure receiving area of the poppet valve 54 and the diaphragm 56.
Is equal to the effective pressure receiving area, the force acting downward on the poppet valve 54 due to the pressure of the hot water entering the hot water inlet 20 and the force upward acting on the diaphragm 56 due to the pressure of the hot water cancel each other out. That is, the poppet valve 54 has
The force due to the pressure in the hot water inlet 20 does not act. The pressure in the mixing chamber 22 acts as a force F that pushes the poppet valve 54 upward. On the other hand, the poppet valve 54 is acted on by the upward force F _S by the temperature responsive coil spring 58 and the downward force F _B by the bias spring 60. Therefore, the poppet valve 54 causes the upward force (F
+ F _S ) and the downward force F _B stabilize in a balanced position as shown by the following equation: F _B = F + F _S (2) More specifically, a temperature responsive coil spring made of a shape memory alloy 58 is sensitive to the temperature of the hot and cold water mixture in the mixing chamber 22,
Since the spring constant changes depending on the mixture temperature, the coil spring 58 generates a spring force according to the mixture temperature as shown in FIG. On the other hand, the bias spring 60 generates a spring force according to the preload thereof, and the preload changes depending on the position of the poppet valve 54, so that the bias spring 60 causes the hot water fully open position and the hot water fully closed position of the poppet valve 54. In between, the spring force as shown in FIG. 3 is generated. In the poppet valve 54, the spring force F _B generated by the bias spring 60, the force F generated by the pressure in the mixing chamber 22 and the spring force F _S generated by the temperature responsive coil spring 58.
Positioned in a position that balances with the sum. This position corresponds to the intersection of the curve of F + F _{S and} the curve of the spring force F _B of the bias spring 60 in FIG. 3, and in this position the flow control valve 14 forms a hot water mixture at a temperature of T ° C. Control the flow rate Q _H. Flow rate Q of the hot and cold water mixture as described above is constant, and, because the sum of the flow rate Q _C of the hot water flow rate Q _H and water, the hot water by the flow control valve 14 the flow rate Q _H
By controlling only the water flow rate Q _C , the flow rate Q _{C of} water is complementarily controlled.

When the temperature of the hot-water mixture transiently rises for some reason, the temperature-responsive coil spring 58
The spring force F _S generated by the above increases, and the poppet valve 54 is displaced upward. As a result, the flow rate of hot water decreases and the flow rate of water increases, and at the same time, the bias spring 60 is compressed and its spring force F _B increases. When the equation (2) is satisfied by the generated spring force F _S of the temperature-responsive coil spring 58 which is determined by the temperature of the hot and cold water mixture and the new spring force F _{B of} the bias spring 60, the poppet valve 54 is in the balanced position. Retained.
On the contrary, when the temperature of the hot and cold water mixture falls transiently,
Contrary to the above, the flow rate of hot water increases and the flow rate of water decreases. In this way, the mixture temperature is maintained at T ° C.

When the user wants to change the temperature of the hot and cold water mixture, the bias spring 60 can be turned by turning the adjusting screw 68.
When the preload of is increased or decreased, the generated spring force F _B of the bias spring 60 moves up and down in parallel in FIG. 3, and the intersection of the F + F _S curve and the F _B curve moves left and right in FIG. 3 correspondingly. As such, the mixture temperature is modified. Therefore, the adjusting screw 68 acts as a means for setting the target temperature of the hot and cold mixture.

As a modification of the first embodiment, it is possible to penetrate a small-diameter back pressure introduction hole in the axial direction of the poppet valve 54 and apply the pressure in the hot and cold water mixing chamber 22 to the diaphragm 56 as a back pressure. In this case, the force F that pushes the poppet valve 54 upward due to the pressure inside the mixing chamber 22 is
Is offset by the force that pushes down the diaphragm 56 due to the back pressure, so that the equation (2) can be rewritten as F _B = F _S. However, in this case as well, in FIG. 3, the spring force F _S generated by the temperature responsive coil spring 58 and the bias spring 60 are
The equilibrium load is determined as the point of intersection with the spring force F _{B of,} and the mixture temperature is changed.

Next, when the user wants to change the flow rate of the hot and cold water mixture, if the preload of the coil spring 42 is increased or decreased by turning the adjusting screw 44 of the pressure control valve 12, the secondary pressure of the pressure control valve 12 is increased. P changes, and the flow rate Q of the hot and cold water mixture is variably adjusted according to the equation (1). Therefore, the adjusting screw 44 acts as a means for variably controlling the flow rate Q of the hot water mixing apparatus 10.

In the embodiment described above, the pressure control valve 1
2 controls the pressure of water, and the flow rate control valve 14 is configured to control the flow rate of hot water. In the second embodiment of the present invention, as shown in FIG. 4, the pressure of the hot water may be controlled by the pressure control valve 12 and the flow rate of water may be controlled by the flow rate control valve 14. In this case, as shown in FIG. 4, a sliding skirt 78 having a plurality of hot and cold water flow openings 76 is provided integrally with the poppet valve 54, and the temperature responsive compression coil spring 58 made of a shape memory alloy is used as the poppet. A bias spring 60 is a tension spring, and acts on the skirt 78 to bias the valve 54 in the opening direction. Alternatively, as a variation, the bias spring 60 may be composed of a compression spring, and may be arranged in the mixing chamber 22 to bias the poppet valve 54 in the valve closing direction. In the embodiment of FIG. 4, the flow control valve 14 controls the water inlet 2 according to the temperature rise of the hot and cold mixture.
It works by increasing the water flow rate from zero and decreasing the water flow rate as the mixture temperature decreases.

In the embodiment described above, the target temperature is set by manually adjusting the preload of the bias spring 60 using the adjusting screw 68, and the temperature of the hot and cold water mixture is mechanically adjusted by the temperature responsive coil spring 58. It was to be feedback controlled. In the third embodiment of the present invention, as shown in FIG. 5, the temperature of the hot and cold water mixture can be electronically feedback-controlled. That is, as shown in FIG. 5, the retainer 62 has a movable spring support 80.
Is axially displaceable, but non-rotatably spline-fitted, and the upper end of the bias spring 60 has a movable spring receiver 8
It is supported by 0. A screw hole penetrates through the movable spring receiver 80, and a worm 84 formed on the output shaft of the motor 82 meshes with this screw hole. Therefore, the motor 8
By rotating 2 in either direction, the movable spring receiver 80 can be displaced and the preload of the bias spring 60 can be adjusted. The motor 82 is controlled by a control circuit 86 including a microcomputer, and a signal from a temperature detector such as a thermistor 88 installed facing the mixing chamber 22 and a target temperature are input to the control circuit 86. A signal from the switch 90 is input. Based on the mixture temperature detected by the thermistor 88 and the target temperature input by the switch 90, the control circuit 86 sets the motor 8 so that the mixture temperature becomes the target temperature.
2 is feedback controlled.

In the third embodiment, the temperature fluctuation due to the transient condition fluctuation is promptly dealt with by the mechanical feedback control of the temperature responsive spring 58 made of a shape memory alloy. The main roles of the feedback control by the control circuit 86 are to correct the hysteresis of the temperature responsive spring 58 made of a shape memory alloy, and to eliminate the offset due to the variation in the spring constant of the temperature responsive spring 58 and the bias spring 60. The removal of stationary offsets due to deterioration of components over time, the removal of other offsets, and the like.

[0033]

In the hot and cold water mixing apparatus of the present invention, the temperature of the mixture can be controlled by controlling the flow rate of either hot water or water.
4 only needs to be able to control the flow rate of one of the fluids, and there is no need to configure the valve part for controlling the hot water and the valve part for controlling the water as an integral unit as in the mixing valve of the prior art. Therefore, in the hot and cold water mixing apparatus of the present invention, there is no portion where leakage between hot and cold water occurs due to its structure. Therefore, the hot and cold water mixing apparatus of the present invention can supply sufficiently hot water or cold water according to the user's request, and has an excellent temperature control function.

The poppet valve 5 is used as the flow control valve 14.
When 4 is used, it is possible to secure a further excellent fluid shutoff performance.

Next, in the hot and cold water mixing apparatus of the present invention,
Since the pressure in the mixing chamber 22 is kept constant by the pressure control valve 12, the flow rate control valve 14 is not affected by the pressure fluctuation of the hot water. Therefore, the mixture temperature can be controlled to a stable value even if there is a transient change in the water pressure or the hot water supply pressure.

Further, since the temperature responsive spring 58 is made of metal, its heat capacity is significantly smaller than that of the conventional wax temperature sensitive element and its thermal conductivity is good, so that the temperature change of the mixture is instantaneous. Respond to each other. Therefore, the mixing apparatus of the present invention can perform highly accurate temperature control with respect to transient fluctuations in conditions.

In accordance with a preferred embodiment of the present invention, the bias spring 60 preload adjustment means is electrically operated and the control circuit 8 is
When feedback control is performed by 6,
It is also possible to correct the influence of the hysteresis of the temperature responsive spring 58, the steady offset caused by the variation of the spring constant due to the manufacturing tolerance, and the offset caused by other causes.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a first embodiment of a hot and cold water mixing apparatus of the present invention.

FIG. 2 is a schematic view showing an example of use of the mixing apparatus shown in FIG.

FIG. 3 is a graph showing temperature changes of generated loads of the temperature responsive spring and the bias spring of the mixing device shown in FIG.

FIG. 4 is a schematic cross-sectional view of a second embodiment of the hot and cold water mixing apparatus of the present invention.

FIG. 5 is a schematic view of a third embodiment of the hot and cold water mixing apparatus according to the present invention, in which the flow rate control valve is cut away.

[Explanation of symbols]

 10: Hot water mixing device 12: Pressure control means 14: Flow rate control means 16: Housing of mixing device 20: Hot water or water flow path 22: Hot water mixing chamber 24: Water or hot water flow path 44: Flow rate variable adjusting means 54: Poppet valve 58: Temperature responsive coil spring 60: Bias spring 68: Temperature setting means 80/82: Electric preload adjusting means 86: Control means 88: Temperature detecting means

Claims (5)

[Claims] 1. A hot and cold water mixing chamber, a hot water flow passage for supplying hot water under pressure to the hot and cold water mixing chamber, a water flow passage for supplying water under pressure to the hot and cold water mixing chamber, and a hot and cold water mixture is discharged from the hot and cold water mixing chamber. A hot water mixture outlet, a pressure control means for making the pressure of the hot water mixture in the hot water mixture chamber constant, a temperature setting means for setting a target temperature of the hot water mixture formed in the hot water mixture chamber, A flow rate control valve for controlling the flow rate of only one of the hot water and the water supplied to the hot and cold water mixing chamber through the flow path, which is made of a metal whose spring constant changes according to the temperature. A temperature-responsive flow control valve for controlling the flow rate of any one of the fluids so that the temperature of the hot and cold water mixture reaches the target temperature. Na Hot and cold water mixing device. 2. The flow control valve is arranged to receive a pressure of the hot and cold mixture in the hot and cold water mixing chamber and a valve seat that crosses the flow of hot water supplied to the hot and cold water mixing chamber, and cooperates with the valve seat to control the hot water. A poppet-type valve body that controls the flow of the valve body, the temperature-responsive coil spring that biases the valve body in the valve closing direction, and a non-temperature-responsive bias spring that biases the valve body in the valve opening direction. The hot and cold water mixing apparatus according to claim 1, further comprising: a temperature setting unit that sets a target temperature by adjusting a preload of the bias spring. 3. The flow control valve is arranged to receive a pressure of the hot and cold water mixture in the hot and cold water mixing chamber and a valve seat that crosses the flow of water supplied to the hot and cold water mixing chamber, and cooperates with the valve seat to control the water flow. A poppet type valve body for controlling the flow of the valve body, the temperature responsive coil spring for urging the valve body in the valve opening direction, and a non-temperature responsive bias spring for urging the valve body in the valve closing direction. The hot and cold water mixing apparatus according to claim 1, further comprising: a temperature setting unit that sets a target temperature by adjusting a preload of the bias spring. 4. The temperature setting means comprises electrical means for adjusting a preload of the bias spring and target temperature input means for inputting a target temperature of the hot and cold water mixture, and the hot and cold water mixing apparatus further comprises a hot and cold water mixture. And a control means for controlling the electric means based on the mixture temperature detected by the detection means and the target temperature input by the input means. Hot water mixing device based on 2 or 3. 5. The pressure control means further comprises means for variably adjusting the pressure of the hot water mixture in the hot water mixing chamber, and the flow rate of the hot water mixture is adjusted by variably adjusting the pressure of the hot water mixture. A hot and cold water mixing apparatus according to any one of claims 1 to 4.