JP3852965B2 - Hot water mixing device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot and cold water mixing device that adjusts the mixing ratio of hot water and water to obtain an appropriate temperature.
[0002]
[Prior art]
FIG. 6 shows a conventional hot water / water mixing apparatus of this type (for example, JP-A-6-159532). In the figure, the housing 12 of the hot and cold water mixing device 10 is substantially liquid-tightly fastened to the main body 14 and the outlet fitting 16 fastened liquid-tightly to the main body by screwing or the like. And a cap 18.
[0003]
The housing 12 is formed with inlets 20 and 22, the inlet 20 acting as a hot water inlet and the inlet 22 acting as a water inlet. A central bore 24 is formed in the housing 12, and a pressure receiving piston 26 is slidably fitted in the bore 24. The housing 12 is divided into a hot water primary pressure chamber 28 and a water primary pressure chamber 30 by the pressure receiving piston 26. The hot water inlets 20 and 22 communicate with the primary pressure chambers 28 and 30, respectively, so that hot water having a primary pressure is supplied to the primary pressure chambers 28 and 30, respectively.
[0004]
The pressure receiving piston 26 is fitted in the bore 24 with a predetermined radial clearance and slides in the bore 24. The hot water side primary pressure chamber 28 and the water side primary pressure chamber 30 communicate with the hot water side valve chamber 36 and the water side valve chamber 38 through valve seats 32 and 34, respectively. The hot water side valve seat 32 and the water side valve chamber 34 are aligned coaxially and arranged symmetrically with respect to each other. The water side valve chamber 38 communicates with the hot water side valve chamber 36 through a plurality of openings 40 formed in the cap 18 and a passage 42 formed in the main body 14, and the water that has passed through the water side valve seat 34 is passed through. It flows into the hot water side valve chamber 36. Accordingly, the hot water side valve chamber 36 functions as a hot water / water mixing chamber, and the hot water / water mixture formed in the hot water / water mixing chamber 36 is discharged from the mixture outlet 44 of the outlet fitting 16.
[0005]
A movable valve body unit 46 is movable in the axial direction inside the housing 12. The valve body unit 46 includes a valve shaft 48 and a hot water side valve body 50 and a water side valve body 52 fixed to both ends of the valve shaft 48 by nuts. The valve shaft 48 is formed integrally with the pressure receiving piston 26, and the movable valve body unit 46 and the pressure receiving piston 26 are interlocked. The hot water side valve body 50 and the water side valve body 52 are aligned coaxially, and the flow of hot water is controlled in cooperation with the hot water side valve seat 32 and the water side valve seat 34, respectively. The effective pressure receiving areas of the pressure receiving piston 26, the hot water side valve body 50, and the water side valve body 52 are equal to each other, and the primary pressure in the hot water side primary pressure chamber 28 acts on the hot water side valve body 50 in the valve opening direction. , Acting on the pressure receiving piston 26 in the opposite direction.
[0006]
Since the effective pressure receiving area of the pressure receiving piston 26 is equal to the effective pressure receiving area of the hot water side valve body 50, the primary pressure in the hot water side primary pressure chamber 28 causes the force acting on the hot water side valve body 50 to be the pressure receiving piston 26. Is offset by the force acting on Similarly, the force acting on the water-side valve body 52 by the primary pressure in the water-side primary pressure chamber 30 and the force acting on the pressure receiving piston 26 by the primary pressure cancel each other. Therefore, the eccentric force resulting from the primary pressure of hot water does not act on the movable valve body unit 46.
[0007]
Further, since the hot water / water mixing chamber 36 and the water side valve body 38 are in communication with each other and the secondary pressure in both is equal, the eccentric force caused by the secondary pressure does not act on the movable valve body unit 46. . Therefore, the movable valve body unit 46 is positioned by the balance of two kinds of mechanical urging forces acting in directions opposite to each other without being affected by the transient fluctuation of the hot water pressure. That is, coil springs 54 and 56 are arranged in a compressed state in the hot and cold mixing chamber 36 and the water side valve chamber 38, respectively.
[0008]
One coil spring 54 functions as a temperature-sensitive element, and is formed of a nickel / titanium-based shape memory alloy having a characteristic that the spring constant changes according to the temperature. The shape memory alloy temperature-sensitive coil spring 54 generates a spring force that changes linearly in accordance with the temperature of the hot and cold water mixture in the mixing chamber 36, and acts on the movable valve body unit 46. The shape memory alloy forming the temperature-sensitive coil spring 54 has an elastic coefficient that changes according to temperature, and as a result, the spring constant of the coil spring 54 and thus the spring force changes according to temperature. One end of the temperature-sensitive coil spring 54 made of the shape memory alloy is supported by the hot water valve body 50 and the other end is supported by the outlet fitting 16. Therefore, the shape memory alloy temperature-sensitive coil spring 54 urges the movable valve body unit left and right.
[0009]
The other coil spring 56 acts as a bias spring and is formed of a normal spring material, and its spring constant is substantially constant with respect to temperature. Therefore, the biasing force generated by the bias spring 56 is proportional to the preload applied thereto. One end of the bias spring 56 is supported by the water-side valve body 52, and the other end is supported by a movable spring receiver 58 that is slidably attached to the cap 18. An adjustment screw 60 screwed into the cap 18 is engaged with the movable spring receiver 58, and the preload of the bias spring 56 can be adjusted by rotating a handle 62 of the adjustment screw. The bias spring 56 urges the movable valve body unit 46 to the left and right.
[0010]
That is, in Japanese Unexamined Patent Publication No. 6-159532, which is a conventional hot and cold water mixing device, the temperature sensing element 54 is formed of a shape memory alloy having a characteristic region in which the spring constant changes linearly in response to a temperature change. The movable valve body 46 is operated by balancing the urging force of the shape memory alloy coil spring 54 and the urging force of the bias spring 56 in the linear characteristic region, and is accompanied by overshoot and undershoot. There has been proposed a hot and cold water mixing device that can finely control the temperature.
[0011]
[Problems to be solved by the invention]
However, the conventional hot and cold water mixing apparatus as described above has a configuration that improves the durability that is anxious about shape memory alloys, and a uniform temperature distribution of the hot and cold water mixture that contacts the shape memory alloy spring whose urging force changes due to temperature changes. There is no particular description of the structure for improving the temperature, and there is a problem that there is anxiety of temperature deviation due to durability and a heterogeneous mixture temperature.
[0012]
The present invention solves the above-mentioned problems, and has as its first object to provide a hot and cold water mixing device that ensures durability against repeated deflection and has low hysteresis in the operating temperature and storage temperature range of the temperature-sensitive coil spring. Yes.
[0013]
The second object is to provide a hot and cold water mixing device capable of accurately controlling hot and cold water mixing by contacting the temperature-sensitive coil spring while hot water and water are being stirred and mixed.
[0014]
[Means for Solving the Problems]
In order to achieve the first object, a hot and cold water mixing device of the present invention includes a hot and cold water mixing valve having a valve body that adjusts the mixing ratio of hot water and water, and an R of a shape memory alloy whose spring constant changes according to temperature. The temperature range in which the phase transformation of the (Rhombohedral) phase to the parent phase occurs is −30 ° C. to + 100 ° C., and the phase transformation of the R phase to the parent phase occurs in the range of the hot water fully open position to the hot water fully closed position of the valve body. consist setting shape memory alloy as a temperature-sensitive spring for biasing the valve body in the direction of decreasing the proportion of water as the temperature rise of the hot and cold water mixture flowing out of the mixing valve, the direction opposite to the valve body And a biasing force adjusting means for adjusting a biasing force of at least one of the two coil springs.
[0015]
In order to achieve the second object, the hot and cold water mixing device of the present invention comprises a hot and cold water mixing valve having a valve body that adjusts the mixing ratio of hot water and water, and a temperature sensitive material whose spring constant changes according to temperature. A temperature-sensitive coil spring that urges the valve body in a direction that reduces the ratio of hot water as the temperature of the hot water mixture flowing out of the mixing valve increases; and a bias coil spring that urges the valve body in the opposite direction; An urging force adjusting means for adjusting an urging force of at least one of the two coil springs is provided, and the urging force adjusting means also has a swirl mixing means for swirling and mixing the hot and cold water mixture in the same direction as the winding direction of the temperature sensitive coil spring. It is a thing.
[0016]
[Action]
With the configuration described above, the hot water mixing apparatus of the present invention has a spring constant that changes depending on the temperature of the valve body that adjusts the mixing ratio of hot water, and in the temperature range of −30 ° C. to + 100 ° C. A biasing force of a temperature-sensitive coil spring made of a shape memory alloy that undergoes phase transformation and a biasing force in a direction opposite to the biasing direction of the temperature-sensitive coil spring act on the valve body by a bias spring, respectively. The valve body is positioned at a position where the urging force of the coil spring is balanced, and the hot water and water flowing into the hot water / mixing valve become a hot / cold water mixture in a mixing ratio according to the opening position of the valve body, and the temperature sensing coil. It flows out around the spring. The target mixing temperature is set by the biasing force adjusting means for adjusting the biasing force of at least one of the two coil springs.
[0017]
Here, the temperature-sensitive coil spring acts in such a manner that it only undergoes a phase transformation that repeats an R (Rhombohedral) phase and a parent phase in a temperature range of -30 ° C to + 100 ° C. Therefore, in the operating temperature and storage temperature range of the temperature sensitive coil spring, the durability against repeated deflection is not impaired, and the temperature of the hot and cold water mixture is controlled with a small hysteresis and high responsiveness.
[0018]
In addition, the hot and cold water mixing device of the present invention is biased by the biasing force of the temperature sensing coil spring and the biasing force in the direction opposite to the biasing direction of the temperature sensing coil spring on the valve body for adjusting the mixing ratio of hot water and water. The valve body is positioned at a position where the springs act on the valve bodies, and the urging forces of the two coil springs are balanced, and the hot water and water flowing into the hot and cold mixing valve correspond to the opening positions of the valve bodies. A mixture of hot water and water having a mixing ratio passes through the temperature-sensitive coil spring and flows out. At this time, the urging force adjusting means also serves as swirl mixing means for swirling and mixing the hot and cold water mixture, so that the hot and cold water mixture is agitated and mixed by the swirling action, and the temperature is uniformed while contacting the temperature sensitive coil spring. pass.
[0019]
Therefore, the temperature shifted from the mixing average temperature up and down at a non-uniform temperature acts on the temperature-sensitive coil spring, and the temperature of the hot and cold water mixture is accurately controlled without causing a temperature control shift.
[0020]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0021]
FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, reference numeral 70 denotes a hot water supply pipe that supplies hot water, and the hot water supply pipe 70 communicates with the mixing valve 71. Hot water and water are supplied to the mixing valve 71 from a hot water supply pipe 70 and a water supply pipe 72, respectively. The mixing valve 71 is supplied with hot water from a hot water inlet 74 and a water inlet 75 provided in the housing 73, and the distance of the gap between the hot water side valve seat 77 and the water side valve seat 78 is inversely proportional to the movement of the valve body 76. In other words, the mixing ratio of hot and cold water is adjusted. The valve body 76 has a cylindrical shape in which hot water and water flow inward from the surroundings, and is biased in the right direction in FIG. 1 by a bias coil spring 79, and in accordance with the temperature provided in the mixing flow path 80. The temperature-sensitive coil spring 81 whose spring constant changes is also urged in the left direction in FIG. Since the spring constant of the temperature-sensitive coil spring 81 changes depending on the temperature, the urging force changes if the restraint length is the same, and the valve body 76 is attached to the bias spring 79 and the temperature-sensitive coil spring 81. Moves to a position where the forces are balanced. Also, the biasing force adjusting means 82 for adjusting the biasing force of the bias spring 79 and the biasing force of the temperature sensing coil spring 81 rotates the biasing force adjusting operation unit 83 so that the biasing force adjusting shaft 84 and the male screw shaft 85 are rotated. The movable spring receiver 84 that rotates and has a female screw advances and retreats. Further, as the shear strain restricting means 87, a pin 88 is provided on the biasing force adjusting shaft 83, and the rotation range restricting member 89 covers the periphery of the pin 88, so that the rotation range of the male screw shaft 85 and the advance / retreat range of the movable spring receiver 86 are covered. As a result, the maximum compression length of the temperature sensitive coil spring 81 is restricted, and the shear strain γ of the temperature sensitive coil spring 81 is restricted to a range not exceeding 1%. The biasing force adjusting shaft 83 is provided with a pin 88, and the rotation range restricting member 89 covers the periphery of the pin 88, so that the rotation range of the male screw shaft 85 and the advance / retreat range of the movable spring receiver 86 are restricted. In FIG. 1, the pin 88 rotates integrally with the biasing force adjusting shaft 83 and the male screw shaft 85, and the rotation range restricting member 89 is fixed to the housing 73 and covers the pin 88 of the rotation range restricting member 89. Since the hole has a hole shape that controls the rotation restriction range of the pin 88, the rotation range of the male screw shaft 85 and the advance / retreat range of the movable spring receiver 86 are restricted, that is, the maximum compression length of the temperature sensitive coil spring 81 is restricted. That is why. The shear strain γ of the coil spring is expressed as a percentage by dividing the product of the coil spring wire diameter d and the coil spring deflection δ by the product of the effective number of turns n of the coil spring and the square of the coil spring average diameter D and π. This is represented by an expression, and γ = (d × δ) ÷ (π × n × D2) × 100%.
[0022]
In addition, the outlet 90 of the mixing valve 71 communicates with the inlet 92 of the flow control switching valve 91. The flow control switching valve 91 is configured such that the spherical valve body 93 is rotated by the flow control switching operation unit 95 via the valve shaft 94 to switch the shower 96 or the curan 97 and adjust the flow rate of each. Reference numeral 98 denotes a ring-shaped sheet member provided between the bias coil spring 79 and the movable spring receiver 86, which improves mutual sliding and prevents unnatural torsion of the bias coil spring 79. Further, the ring-shaped sheet member 99 provided at the contact portion of the temperature-sensitive coil spring 81 can similarly prevent an unnecessary twisting action of the temperature-sensitive coil spring 81 and ensure good temperature adjustment performance by mixing hot and cold water. It is effective for.
[0023]
The operation of the present embodiment with the above configuration will be described. When the flow adjustment switching operation unit 95 is operated and the hot water is discharged from the shower 96 as shown in FIG. 1 while the desired mixing temperature is set by the urging force adjustment operating unit 83 of the urging force adjusting means 82, the hot water supply pipe 70 and the water supply are supplied. From the pipe 72 to the hot water inlet 74 and the water inlet 75 of the mixing valve 71, hot water and water respectively flow from the periphery of the valve body 76 according to the clearance distance between the valve body 76 and the hot water side valve seat 77 and the water side valve seat 78. It flows into the inside and is mixed in the mixing flow path 80, and the hot and cold water mixture passes while contacting the temperature-sensitive coil spring 81.
[0024]
At this time, the valve body 76 is positioned by the balance of the mechanical urging force between the urging force of the temperature-sensitive coil spring 81 corresponding to the temperature of the hot water mixture and the urging force of the bias coil spring 79 corresponding to the set temperature. That is, when the actual hot water / water mixture temperature is lower than the biasing force of the bias coil spring 79 corresponding to the desired temperature set by the biasing force adjusting means 82, the biasing force of the temperature-sensitive coil spring 81 is smaller and the hot water side The clearance distance between the valve seat 77 and the valve body 76 is increased, and the valve body 76 is moved in the direction in which the clearance distance between the water-side valve seat 78 and the valve body 76 is reduced.
[0025]
On the contrary, when the actual hot water / water mixture temperature is higher than the biasing force of the bias coil spring 79 corresponding to the desired temperature set by the biasing force adjusting means 82, the biasing force of the temperature sensing coil spring 81 is larger. The clearance distance between the side valve seat 77 and the valve body 76 is reduced, and the valve body 76 is moved in a direction in which the clearance distance between the water-side valve seat 78 and the valve body 76 is increased. Thus, the mechanical feedback control functions so that the desired temperature set by the urging force adjusting means 82 is always maintained by the action of the temperature-sensitive coil spring 81, the valve body 76 is activated, and the automatic operation is automatically performed. The temperature can be adjusted.
[0026]
FIG. 2 shows the relationship between the displacement and force of the temperature-sensitive coil spring 81, the bias coil spring 79, and the valve body 76 in the present embodiment as described above. The temperature-sensitive coil spring 81 changes its urging force according to each temperature and displacement as shown in the figure. Further, the bias coil spring 79 linearly changes its urging force according to the displacement regardless of the temperature. Since the displacement of the bias coil spring 79 and the temperature sensitive coil spring 81 changes inversely with the displacement of the valve element 76, the temperature sensitive coil spring characteristic line and the bias coil spring characteristic line at each temperature in FIG. Each of the intersection points becomes an operating point.
[0027]
Further, if the hot water is fully opened, the maximum temperature set point is the point at which the shear strain γ of the temperature-sensitive coil spring 81 becomes the maximum at the valve position of the water fully closed, as shown in FIG. Then, since the shear strain regulating means 87 is provided so that the shear strain γ is 1% or less at this position, no shear strain exceeding 1% acts on the temperature-sensitive coil spring 81. An experiment was conducted to test the automatic temperature control performance of a hot and cold water mixing apparatus when the shear strain is 1% or less and when the shear strain is 2 to 3%. Could get.
[0028]
As described above, according to the present embodiment, the temperature-sensitive coil spring 81 undergoes repeated deflection within a range where the shear strain γ is within 1%, and the temperature of the hot water / water mixture is not impaired without impairing the durability of the temperature-sensitive coil spring 81. Is controlled, and a highly durable automatic temperature control hot and cold water mixing device is obtained.
[0029]
As shown in the region of FIG. 3, the second embodiment of the present invention is a temperature-sensitive material made of a shape memory alloy that undergoes a phase transformation of R (Rhombohedral) phase or parent phase in a temperature range of −30 ° C. to + 100 ° C. The coil spring 81 is mounted on the hot and cold water mixing device shown in FIG. 1, and the spring constant changes depending on the temperature of the valve body 76 that adjusts the mixing ratio of hot water and the water in the temperature range from −30 ° C. to + 100 ° C. The bias spring 79 has a biasing force in the direction opposite to the biasing direction of the temperature-sensitive coil spring 81 and the biasing force in the direction opposite to the biasing direction of the temperature-sensitive coil spring 81 by the bias spring 79. The valve body 76 is positioned at a position where the urging forces of the two coil springs 79 and 81 are balanced by acting on the valve body 76, and the hot water and water flowing into the hot and cold mixing valve 71 are transferred to the valve body 76. Become hot and cold water mixing of the mixing ratio corresponding to degrees position, it flows through the periphery of the temperature-sensitive spring 81. The target mixing temperature is set by the biasing force adjusting means 82 that adjusts the biasing force of at least one of the two coil springs 79 and 81.
[0030]
Here, the temperature sensitive coil spring 81 is a shape memory alloy coil spring having a heat treatment temperature of 400 to 500 ° C. made of nickel / titanium binary alloy or nickel / titanium ternary alloy, and in a temperature range of −30 ° C. to + 100 ° C. As shown in FIG. 3, the displacement region of the temperature-sensitive coil spring 81 is restricted in the configuration of FIG. 1 so that only the R (Rhombohedral) phase or the parent phase is transformed.
[0031]
In other words, when the valve body 76 is biased by the bias coil spring 79 and is in contact with the water side valve seat 78, the temperature sensitive coil spring 81 is displaced to the most compression side, and the valve body in the opposite direction. When 76 is in contact with the hot water valve seat 78, the temperature-sensitive coil spring 81 is the most extended and displaced point.
[0032]
That is, the temperature-sensitive coil spring 81 is configured such that the amount of displacement is regulated between these two points. In such a displacement region and a temperature range from −30 ° C. to + 100 ° C., as shown in FIG. ) There is only a phase transformation of the phase or mother phase. As apparent from FIG. 3, the hysteresis is overwhelmingly smaller than in the case where the phase transformation is performed up to the M (martensite) phase region. In the automatic temperature control operation by mechanical feedback explained in the first embodiment, temperature hysteresis is extremely small, fine temperature control is possible, and martensite transformation does not occur, so it is durable against repeated deflection. There is an effect that the life is not deteriorated.
[0033]
As described above, according to the present embodiment, the temperature-sensitive coil spring 81 acts so as to only undergo a phase transformation that repeats the R (Rhombohedral) phase and the parent phase, and the operating temperature and storage temperature range of the temperature-sensitive coil spring 81. Thus, a hot and cold water mixing device can be obtained that does not impair durability against repeated deflection and has a small hysteresis and a high-precision temperature control.
[0034]
FIG. 4 is a block diagram of a hot water mixing apparatus showing a third embodiment of the present invention. The difference from the structure of the hot water mixing apparatus in FIG. 1 is that the swirl mixing means 100 is provided near the tip of the male screw shaft 85. The male screw shaft 85 is formed long, and the swirl mixing means 100 near the tip of the male screw shaft 85 is inserted inside the temperature-sensitive coil spring 81. The swirl mixing means 100 has a winding direction of the temperature-sensitive coil spring 81. This is a configuration having spiral strips in the same direction. In FIG. 4, the biasing force of the temperature sensing coil spring 81 and the biasing force in the direction opposite to the biasing direction of the temperature sensing coil spring 81 are applied to the valve body 76 for adjusting the mixing ratio of hot water and water by the bias coil spring 79. The valve body 76 is positioned at a position where the urging forces of the two coil springs 79 and 81 are balanced by acting on the body 76, and the hot water and the water flowing into the hot and cold mixing valve 71 correspond to the opening position of the valve body 76. It becomes a hot water / water mixture having a mixing ratio and flows out around the temperature sensitive coil spring 81. At this time, since the swirl mixing means 100 having a spiral strip in the same direction as the winding direction of the temperature-sensitive coil spring 81 is inserted inside the temperature-sensitive coil spring 81, the hot and cold water mixture is a spiral temperature-sensitive coil spring. 81 and the spiral strip of the swirling and mixing means 100 are formed in a spiral shape, and the hot water entered from the hot water inlet 74 and the water entered from the water inlet are stirred and mixed while swirling to equalize the temperature. The mixed fluid that is in contact with the temperature-sensitive coil spring 81 is accelerated by the swirling flow, and an effect of promoting heat transfer by boundary layer separation or the like is generated. At this time, in the swirl mixing means that swirls in a direction different from the winding direction of the temperature-sensitive coil spring 81, the swirling of the fluid is obstructed and the above effect is weakened. That is, the swirling and mixing means 100 of the present embodiment promotes stirring and mixing of the hot and cold water mixture by swirling action, makes the temperature of the mixture uniform, and promotes heat transfer to the temperature sensitive coil spring 81.
[0035]
Therefore, the temperature shifted from the mixing average temperature up and down at a non-uniform temperature acts on the temperature-sensitive coil spring 81, and there is no problem that a temperature control shift occurs, and the temperature of the hot and cold water mixture can be accurately controlled. .
[0036]
As described above, according to the present embodiment, the swirling and mixing means 100 that swirls the hot and cold water mixture in the same direction as the winding direction of the temperature-sensitive coil spring 81 can prevent temperature control deviation due to non-uniform temperature and can achieve high responsiveness and accuracy. A hot and cold water mixing device capable of adjusting the temperature can be obtained.
[0037]
FIG. 5 is a block diagram of a hot water mixing apparatus showing a fourth embodiment of the present invention. The difference from the hot water mixing apparatus in FIG. 4 is a stepping motor for adjusting the biasing force of the bias coil spring 79. Electrical urging force adjusting means 101, temperature detecting means 102 comprising a thermistor for detecting the temperature of the hot / cold water mixture, temperature setting means 103 for setting a target value of the hot / cold water mixture temperature, and temperature detected by the temperature detecting means 102 And an electronic control means 104 for controlling the electrical urging force adjusting means 101 based on the target value set by the temperature setting means 103, and instructions from the currant or shower outlet selection switch 105 and the flow rate adjustment switch 106 The electric valve body driving means comprising a stepping motor for driving the spherical valve body 93 of the flow control switching valve 91 via the electronic control means 104 07 is a point that is provided. In FIG. 5, by the swirling and mixing means 100 that swirls the hot and cold water mixture in the same direction as the winding direction of the temperature sensitive coil spring 81, the hot and cold water mixture is promoted to be stirred and mixed by the swirling action. The mixture average temperature is accurately transferred to the temperature-sensitive coil spring 81 and mechanically feedback-controlled, and the electronic control means 104 detects the mixture temperature detected by the temperature detection means 102 and the temperature setting means 103. The electric urging force adjusting means 101 is driven based on the target value set by the above, and the mixture temperature is electrically feedback controlled to the target value. Therefore, the temperature deviation due to the hysteresis of the shape memory alloy, the water pressure fluctuation, the flow rate change, etc. is corrected by the electrical feedback control.
[0038]
As described above, according to this embodiment, the transient temperature fluctuation of the hot / cold water mixture is controlled by mechanical feedback control while the hot / cold water mixture stirred and mixed by the swirl mixing means 100 is in contact with the temperature sensitive coil spring 81 made of shape memory alloy. The stationary offset is detected by the temperature detecting means 102 and is electrically fed back by the electronic control means 104, so that there is no temperature offset or hunting. It is possible to provide a hot and cold water mixing device that has excellent responsiveness and can control the temperature with high accuracy.
[0039]
【The invention's effect】
As described above in detail, the hot and cold water mixing apparatus of the present invention is a shape memory alloy that changes in spring constant according to temperature and undergoes a phase transformation of R (Rhombohedral) phase or parent phase in a temperature range of −30 ° C. to + 100 ° C. Since the structure is provided with a temperature-sensitive coil spring, temperature adjustment can be performed with high accuracy in a range of operating temperature and storage temperature without impairing durability against repeated deflection and with small hysteresis.
[0040]
Moreover, the hot and cold mixing device of the present invention can prevent temperature control deviation due to non-uniform temperature due to the stirring effect of the swirling flow, and can accurately adjust the temperature with high responsiveness.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water mixing apparatus showing a first embodiment of the present invention. FIG. 2 is a characteristic diagram of generated urging force at each displacement and temperature of a temperature sensitive coil spring and a bias coil spring of the hot water mixing apparatus. FIG. 3 is a characteristic diagram of a temperature-sensitive coil spring of a hot-water mixing apparatus according to a second embodiment of the present invention. FIG. 4 is a configuration diagram of a hot-water mixing apparatus according to a third embodiment of the present invention. Fig. 6 is a block diagram of a hot water / water mixing apparatus showing a fourth embodiment of the present invention.
DESCRIPTION OF SYMBOLS 71 Mixing valve 76 Valve body 79 Bias coil spring 81 Temperature sensitive coil spring 82 Energizing force adjustment means 87 Shear strain control means 100 Swirling mixing means 101 Electrical energizing force adjustment means 102 Temperature detection means 103 Temperature setting means 104 Electronic control means

Claims (2)

A hot water / water mixing valve having a valve body that adjusts the mixing ratio of hot water and water, and a temperature range in which the phase transformation of the R (Rhombohedral) phase to the parent phase of the shape memory alloy whose spring constant changes according to the temperature is −30 ° C. A hot water mixture that is made of a shape memory alloy that is set to ˜ + 100 ° C. and that the phase transformation of the R phase to the parent phase occurs in the range of the hot water fully open position to the hot water fully closed position of the valve body, and flows out from the mixing valve At least one of the two coil springs, a temperature-sensitive coil spring that biases the valve body in a direction that reduces the ratio of hot water as the temperature rises, a bias coil spring that biases the valve body in the opposite direction, and An apparatus for mixing hot and cold water comprising an urging force adjusting means for adjusting the urging force. It consists of a hot and cold water mixing valve having a valve body that adjusts the mixing ratio of hot water and water, and a temperature-sensitive material whose spring constant changes according to the temperature, and the ratio of hot water with the temperature rise of the hot and cold water mixture flowing out from the mixing valve A temperature-sensitive coil spring that urges the valve body in a decreasing direction, a bias coil spring that urges the valve body in the opposite direction, and an urging force adjusting means that adjusts the urging force of at least one of the two coil springs. And the urging force adjusting means also has swirl mixing means for swirling and mixing the hot and cold water mixture in the same direction as the winding direction of the temperature sensitive coil spring .

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