JP2010181006A - Mixing valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing valve device capable of preventing only high temperature hot water from erroneously flowing out even when water supply to a valve is stopped and securing safety. <P>SOLUTION: In a temperature range for normal usage of mixed water, a valve element 30 moves integrally with a spool 20 to adjust the inflow ratio of water and hot water. When the mixed water becomes abnormally high in temperatures, a temperature sensing spring 40 made of a shape memory material disposed in the same housing 10 comes in contact with the high temperature and becomes deformed, and the valve element 30 is moved so that an inflow port 13 of hot water is closed. Further, upon receiving abnormal temperature detection of a temperature sensor 60, a separate flow passage of mixed water is closed, so that in an abnormal state where water does not flow into the housing 10, the temperature sensing spring 40 immediately moves the valve element 30, and the valve element 30 quickly closes the inflow port 13 of hot water, so that time from when the temperature in the housing 10 becomes abnormally high to when inflow of hot water is suppressed is shortened. High temperature hot water can be prevented from erroneously flowing out to the downstream side, and safety can be secured. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mixing valve device that mixes water and hot water while appropriately adjusting the mixing ratio so that the water can be taken out as mixed water at a predetermined temperature.

The mixing valve that receives the supply of water and hot water, adjusts the ratio of water and hot water to make a mixed state, and sends it out as mixed water at a predetermined temperature. In addition to the normal adjustment mechanism that adjusts and controls the ratio to obtain mixed water at the temperature desired by the user, it is equipped with a thermal element that deforms according to the temperature of the mixed water, and supplies water and hot water due to external factors. Another automatic temperature that can maintain the mixed water in an appropriate temperature range by automatically adjusting the mixing ratio of water and hot water by deformation of the thermal element corresponding to the change in the mixed water temperature due to the volume change or sudden change in the amount of water used, etc. A control mechanism is often used together.
An example of such a conventional mixing valve is disclosed in JP-A-6-131557.

  This conventional mixing valve uses a wax-type thermal expansion device using expansion and contraction due to the heat of wax as a thermal element for automatically adjusting the temperature of mixed water.

Japanese Patent Laid-Open No. 6-131057

  The conventional mixing valve has a structure shown in the above-mentioned patent document, and is a mechanism that can automatically adjust the temperature by operating the thermal element in response to the temperature change of the mixed water. When shared with water-using equipment, the amount of water supplied may suddenly drop or stop supplying as water is used by other equipment. In such a situation, almost only hot water is supplied to the inside of the mixing valve, and when adjustment is performed by automatically moving the valve body such as an electric motor or the like, the forced detection is performed after the detection unit of the mixed water temperature detects an abnormally high temperature. In addition to the fact that it takes some time to move the valve body to reduce the amount of inflow of hot water, the wax-type thermal expansion device as a thermal element operates to close the hot water inflow passage when it contacts hot water. Although the amount of hot water is reduced, it is difficult to operate quickly due to the nature of the wax, etc., so it is not possible to completely stop the hot water from flowing downstream from the mixing valve. It had the problem of being involved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mixing valve device that can ensure safety without causing only hot water to accidentally flow out even when water supply to the valve is delayed. And

  The mixing valve device according to the present invention has a housing in which water and hot water can flow into an internal gap portion, and a spool that is arranged in the gap portion of the housing so that the position can be adjusted. The position of the spool is adjusted so as to change the communication state between each inlet and the inside of the housing with respect to each of the water and hot water inlets, and a predetermined temperature obtained by adjusting the ratio of the inflow amount of water and hot water. In the mixing valve device capable of delivering mixed water to the outside of the housing, it is mounted on the spool so as to be movable within a predetermined range in the longitudinal direction of the spool, and moves along the water and hot water inlets of the housing. A valve body that opens and closes the valve body, and the valve body and the spool are disposed in the housing in such a manner that both ends thereof are in contact with each other to press and bias the valve body in one of the longitudinal directions of the spool. Service temperature A temperature-sensitive spring made of a shape memory material that deforms to increase the distance between both ends when the temperature becomes higher than the range, and the valve body and the spool are brought into contact with both ends, respectively, so that the valve body is placed on the other side in the spool longitudinal direction. A valve body holding spring which is arranged to be urged and maintains the valve body position constant in the normal use temperature range of the mixed water, while allowing the valve body to move due to the deformation in a high temperature deformation state of the temperature sensitive spring. A temperature sensor that detects the temperature of the mixed water, an actuator that adjusts the position of the spool according to a difference between a temperature obtained by the temperature sensor and a predetermined set temperature, and the temperature sensor detects an abnormal temperature of the mixed water A control valve portion that closes the flow path of the mixed water when the state is detected and stops sending the mixed water downstream, and the hot water inlet in the housing is in the longitudinal direction of the spool with respect to the water inlet On one side When the valve body, which is arranged and moves together with the spool in accordance with the adjustment of the position of the spool, moves to one side in the longitudinal direction of the spool, it increases the inflow amount of water while reducing the inflow amount of hot water. When moved to the other side, it is shaped and arranged to increase the inflow amount of hot water while reducing the inflow amount of water, and the valve element moves to one side of the spool longitudinal direction with respect to the spool in the high temperature deformation state of the temperature sensitive spring. Then, the hot water inlet is closed.

  As described above, according to the present invention, in the normal use temperature range of the mixed water, the valve body, which is movably disposed on the spool, moves integrally with the spool to adjust the inflow ratio of water and hot water, while the mixed water When the temperature rises to an abnormally high temperature, a temperature-sensitive spring made of a shape memory material disposed in the same housing deforms in contact with the high temperature, and moves the valve body so that the hot water inlet is closed. In the abnormal state where water does not flow into the housing due to the control valve part closing the mixed water flow path in response to the abnormal temperature detection, the feeling of touching hot water that is not cooled by water. The temperature spring immediately deforms and moves the valve body, and the valve body closes the inlet of the hot water quickly, and the time until the inflow of hot water is suppressed after the temperature inside the housing becomes abnormally high is reached. Short, accidentally hot water flows downstream The situation can be prevented, safety can be ensured, and the mixed water flow path is also closed, so that the feeding from the mixing valve can be stopped in an abnormal state, preventing the situation where water or hot water can flow out in the abnormal state. The mixed water delivery can be resumed at the stage where the normal state is surely restored, and extra adjustment, opening and closing operations are unnecessary, and labor saving of the mixed water delivery can be achieved.

  Further, in the mixing valve device according to the present invention, if necessary, a part of the spool also serves as the control valve unit, and the position of the spool is adjusted by an actuator when the temperature sensor detects an abnormal temperature state of the mixed water. Then, a predetermined portion of the mixed water flow path of the housing is closed.

  As described above, according to the present invention, the spool is used as a control valve portion that closes the flow path of the mixed water when the abnormal temperature state is detected, and the mixed water flow path is closed by adjusting the position of the spool to discharge the mixed water. By preventing this, it is not necessary to separately provide a valve for closing the mixed water flow path, and the mixed water delivery stop can be executed only by the mixing valve, and the configuration of the mixed water delivery system can be simplified.

  Further, the mixing valve device according to the present invention has a large-diameter portion where an adjacent portion of the spool to the temperature-sensitive spring end portion is positioned on the outer peripheral side with respect to the center axis of the spool, as necessary. When the temperature sensor detects an abnormal temperature state of the mixed water, the spool is moved to one side of the spool longitudinal direction by the actuator and at least the valve body closes the hot water inlet, The end of the mixed water flow path surrounding the temperature sensitive spring is closed with the large diameter portion of the spool.

  As described above, according to the present invention, the large-diameter portion adjacent to the temperature-sensitive spring located in the mixed water flow path is used as the portion for closing the mixed water flow path in the spool, and the end of the mixed water flow path around the temperature-sensitive spring is used. By moving the large diameter part of the spool to the part and closing it, the temperature sensing spring is deformed at the abnormal temperature of the mixed water, and the valve body is moved to reliably prevent the mixed water from flowing out. As it is, the open / close part of the mixed water channel is kept in a limited area in the housing, the mixing valve can be made more compact, and the large diameter part of the spool is the end of the mixed water channel part around the temperature sensitive spring It acts as a baffle plate in the vicinity, and mixing of hot water and water around the temperature-sensitive spring can be promoted to cope with abnormal temperatures in the temperature-sensitive spring with higher accuracy.

It is a schematic block diagram of the mixing valve apparatus which concerns on one Embodiment of this invention. It is a mixed delivery state explanatory drawing of water and hot water at the time of normal of the mixing valve device concerning one embodiment of the present invention. It is a sending state explanatory view of only water at the time of normal of the mixing valve device concerning one embodiment of the present invention. It is a temperature-sensitive spring deformation | transformation state explanatory drawing at the time of abnormality of the mixing valve apparatus which concerns on one Embodiment of this invention. It is a mixed water flow path blockage state explanatory view in a housing at the time of abnormality of the mixing valve device concerning one embodiment of the present invention.

Hereinafter, a mixing valve device according to an embodiment of the present invention will be described with reference to FIGS.
In each of the drawings, the mixing valve device 1 according to the present embodiment is disposed in a housing 10 in which water and hot water can flow into an internal gap portion 11 and in the gap portion 11 of the housing 10 so that the position can be adjusted. A shape of the spool 20, a valve body 30 disposed on the spool 20 so as to be movable within a predetermined range in the longitudinal direction of the spool, and a shape in which both ends are in contact with the spool 20 and the valve body 30 in the housing 10. The temperature sensing spring 40 made of a memory material, the valve body holding spring 50 disposed on the opposite side of the valve body 30 with respect to the temperature sensing spring 40, and the temperature of the mixed water in which water and hot water are mixed are detected. The temperature sensor 60 includes a temperature sensor 60 and an actuator 70 that adjusts the position of the spool 20 in accordance with the difference between the temperature obtained by the temperature sensor 60 and a predetermined set temperature.

The housing 10 has a configuration in which a gap portion 11 in which a spool 20 is mounted so as to be movable in the longitudinal direction, a water inlet 12, a hot water inlet 13, and a mixed water outlet 14 communicating with the gap 11 are formed. It is. The water inlet 12 and the hot water inlet 13 in the housing 10 are arranged side by side in the spool longitudinal direction, and the hot water inlet 13 is located on one side in the spool longitudinal direction with respect to the water inlet 12.
The water inlet 12 is connected to a water supply source, the hot water inlet 13 is connected to a hot water supply source, and the outlet 14 is connected to a downstream flow path 80 of the mixing valve.

  Of the gap portion 11 of the housing 10, the portion where the intermediate diameter portion 12 of the spool 20 and the temperature sensitive spring 40 are located is the narrowest. A gap portion sandwiched between the inner peripheral portions of the cylindrical surface of the housing 10 surrounding the housing 10 becomes a mixed water flow path in which water and hot water are mixed.

  The spool 20 is formed of a substantially cylindrical shaft-like body in which cylindrical surfaces having different diameters are combined in the axial direction, and is disposed in the gap portion 11 of the housing 10 so as to be movable in the longitudinal direction. The position of the inlets 13 and 14 is adjusted by an actuator 70 so as to change the communication state between the inlets and the inside of the housing 10.

  By adjusting the position by the actuator 70, the spool 20 changes the communication state of the water inlet 12 and the hot water inlet 13 with respect to the gap portion 11 of the housing 10 to adjust the ratio of the inflow amount of water and hot water. This is a mechanism that enables mixing water at a predetermined temperature obtained by mixing to be sent out of the housing 10.

  The spool 20 is formed with a small-diameter portion 23, an intermediate-diameter portion 22 and a large-diameter portion 21 in order from one end portion in the longitudinal direction, and the valve body 30 and the small-diameter portion 23 having the smallest outer diameter are formed around the spool 20. A valve body holding spring 50 is disposed, and a temperature sensitive spring 40 is disposed around the intermediate diameter portion 22 having an outer diameter larger than the small diameter portion 23.

  A portion adjacent to the end of the temperature-sensitive spring 40 of the spool 20 is configured to be a large-diameter portion 21 positioned on the outer peripheral side with respect to the center axis of the spool 20 from the existence range of the temperature-sensitive spring 40. When the temperature sensor 60 detects an abnormal temperature state of the mixed water as the control valve unit, the large diameter portion 21 closes the mixed water flow path of the housing 10 along with the spool movement by the actuator 70, and the downstream of the mixing valve This is a mechanism to stop the sending of mixed water to the side.

  That is, when the temperature sensor 60 detects an abnormal temperature state of the mixed water, the actuator 70 moves the spool 20 to one side in the longitudinal direction of the spool, and the valve body 30 closes the hot water inlet 13. The spool 20 is further moved to one side in the longitudinal direction of the spool by the actuator 70, and the end of the gap portion 11 that surrounds the spool 20 and the temperature-sensitive spring 40 of the housing 10 is connected to the large diameter portion 21 of the spool. It will be closed.

  The valve body 30 is formed of a substantially cylindrical body having a hole through which the spool 20 passes in the center and a hole through which water or hot water passes, and a predetermined range in the longitudinal direction of the spool is formed in the small diameter portion 23 of the spool 20. It is mounted so as to be movable, and moves along the water inlet 12 and the hot water inlet 13 of the housing 10 to open and close each inlet. The size of the valve body 30 in the longitudinal direction of the spool is set corresponding to the interval between the water inlet 12 and the hot water inlet 13, and the valve body 30 moves integrally with the spool 20 as the position of the spool 20 is adjusted. However, when it moves to one side in the longitudinal direction of the spool, the communication area between the water inlet 12 and the gap 11 is reduced by narrowing the communication area between the hot water inlet 13 and the gap 11 and reducing the amount of inflow of hot water. When the amount is increased and the valve body 30 moves to the other side in the longitudinal direction of the spool, the communication area between the hot water inlet 13 and the gap portion 11 is widened to increase the inflow amount of hot water. The communication area is narrowed to reduce the inflow of water.

  The temperature-sensitive spring 40 has both ends abutting the large-diameter portion 21 of the spool 20 and the valve body 30 around the intermediate diameter portion 22 of the spool 20, respectively. It is the structure made into the coil spring made from shape memory material arrange | positioned by the arrangement | positioning which presses and urges to. When the ambient temperature of the temperature-sensitive spring 40 is higher than the normal use temperature range of the mixed water, for example, hot water that has not been cooled with water and maintained at a high temperature, such as a state where only hot water has flowed into the housing 10. In the situation where there is around the transformation temperature, it will be deformed by the ambient temperature exceeding the transformation point and trying to return to the predetermined memory shape where the distance between both ends of the coil spring is extended, so that a larger urging force than in the normal operating temperature range The valve body 30 is moved to one side in the spool longitudinal direction with respect to the spool 20 by overcoming the urging force of the valve body holding spring 50, and the valve body 30 is located at any position in the position adjustment range. Thus, the hot water inlet 13 can be closed.

  The valve body holding spring 50 is a coil spring formed of a general spring material that has the property of not easily corroding by contact with water or hot water, but the spring force does not change greatly depending on the temperature. Both ends of the valve body 30 and the spool 20 are brought into contact with each other around the small-diameter portion 23, and an urging force is applied to the valve body 30 in the other direction of the spool, that is, in the direction of pressing the valve body 30 against the temperature sensitive spring 40. In this configuration, contact between the valve body 30 and the temperature-sensitive spring 40 is maintained. The urging force of the valve body holding spring 50 exceeds or balances the urging force of the temperature-sensitive spring 40 in a state where the temperature-sensitive spring 40 does not deform due to high temperature in the normal use temperature range of the mixed water. While the body 30 is held at a fixed position with respect to the spool 20, the valve body 30 is allowed to move along with this deformation when the temperature-sensitive spring 40 is deformed at a high temperature.

The temperature sensor 60 is a known sensor that detects the temperature of the mixed water and outputs temperature information as an electrical signal, and will not be described in detail.
The actuator 70 adjusts the position by moving the spool 20 in the longitudinal direction according to the difference between the temperature obtained by the temperature sensor and a predetermined set temperature preset by the user. The operation in the normal use temperature range is the same as that of a known electric actuator having an operation control system based on the detected temperature, and detailed description thereof is omitted.

  However, when the temperature sensor 60 detects an abnormal temperature state of the mixed water, the actuator 70 moves to a position where the large-diameter portion 21 of the spool 20 closes the most narrow portion of the gap portion 11 which is a mixed water flow path. Then, the position adjustment control operation for moving the spool 20 in one of the longitudinal directions is executed.

  Next, the operation state in the mixing valve device according to the present embodiment will be described. As a premise, it is assumed that the temperature of the mixed water desired by the user for use of the mixed water is input and set to the actuator 70 of the mixing valve device 1 in advance.

  When an instruction to start delivery of the mixed water is given based on the curan operation on the downstream side of the mixing valve by the user, the temperature of the mixed water in the downstream flow path 80 is acquired by the detection output from the temperature sensor 60 and set in advance. The position of the spool 20 is adjusted by the actuator 70 so that the temperature acquired from the temperature sensor 60 matches the measured temperature.

  In a state where the valve body 30 whose position is adjusted integrally with the spool 20 allows the water inlet 12 and the hot water inlet 13 of the housing 10 to communicate with the gap 11 (see FIG. 2), the water inlet to which water is supplied. Water and hot water flow into the gap portion 11 from the hot water inlet 13 to which 12 and hot water are supplied, and the water and hot water are mixed into the mixed water in the gap portion 11, and this mixed water becomes the temperature-sensitive spring 40 and the large diameter of the spool. It reaches the outlet 14 through the periphery of the portion 21, and sends mixed water from the outlet 14 to the downstream flow path 80.

  In this case, the closed state of the valve body 30 with respect to the water inlet 12 and the hot water inlet 13 varies depending on the spool longitudinal direction positions of the spool 20 and the valve body 30, and the communication region of the water inlet 12 and the hot water inlet 13 with respect to the gap portion 11. An amount of water or hot water corresponding to the size of the water flows into the gap 11, and mixed water having a temperature corresponding to the ratio of water and hot water is obtained. Thus, by adjusting the communication state of the water inlet 12 and the hot water inlet 13 and the gap 11 with the valve body 30, the ratio of the water flowing from the water inlet 12 and the hot water flowing from the hot water inlet 13 is appropriate. To obtain the desired mixed water temperature. Whenever the set temperature is changed, the ratio of water and hot water is changed by changing the spool position so that the temperature obtained from the temperature sensor 60 matches the set temperature.

  However, in a state where the valve body 30 completely closes the hot water inlet 13 and only the water inlet 12 communicates with the gap 11 (see FIG. 3), only water flows into the gap 11 and only this water flows. The water reaches the outlet 14 and is supplied to the downstream flow path 80 as it is.

  Thus, while the water and hot water are appropriately supplied to the water inlet 12 and the hot water inlet 13, the mixed water obtained by mixing the water and hot water in the gap portion 11 stays in the normal operating temperature range. The hot spring 40 is not deformed at a high temperature, the position of the valve body 30 with respect to the spool 20 is hardly changed, and the state in which the valve body 30 is aligned with the spool 20 is maintained.

  On the other hand, if the water supply suddenly drops or stops due to water use in other applications on the water supply side or a malfunction of the supply system, only hot water supply from the hot water supply source is normal. By continuing, the inflow ratio of the hot water from the hot water inlet 13 to the gap 11 in the housing 10 becomes abnormally large, and the hot water that has not been cooled by the water from the outlet 14 of the mixing valve is kept at a high temperature. However, at this time, the temperature-sensitive spring 40 is rapidly deformed so as to extend its entire length by contacting with hot water that has reached a temperature exceeding the transformation point at which the temperature-sensitive spring 40 transitions to the shape set in advance. The valve body 30 is moved independently of the spool 20 to a position where the hot water inlet 13 is blocked (see FIG. 4), and the inflow of hot water from the hot water inlet 13 into the gap portion 11 is quickly stopped. .

  Almost at the same time, the actuator 70 moves the spool 20 in one of the longitudinal directions based on the fact that the temperature sensor 60 detects an abnormality such as a state in which water is not supplied or an excessive temperature rise due to the inflow of only hot water into the housing 10. Then, the end of the most narrow part of the gap 11 forming the mixed water flow path in the housing 10 is closed by the large diameter portion 21 of the spool (see FIG. 5). By blocking the communication between the inlet side and the outlet 14 in the housing 10 in this way, it is possible to reliably prevent high-temperature hot water from flowing out of the housing 10 to the outside of the mixing valve, thereby ensuring safety.

  As described above, in the mixing valve device according to this embodiment, the valve body 30 movably disposed on the spool 20 moves integrally with the spool 20 in the normal use temperature range of the mixed water, so that water and hot water flow in. While adjusting the ratio, when the mixed water reaches an abnormally high temperature, the temperature-sensitive spring 40 made of a shape memory material disposed in the same housing 10 is deformed in contact with the high temperature, and the hot water inlet 13 In an abnormal state where water does not flow into the housing 10 because the large diameter portion 21 of the spool separately closes the mixed water flow path upon receiving the abnormal temperature detection of the temperature sensor 60, The temperature sensing spring 40 that is in contact with hot water that is not cooled by water is immediately deformed to move the valve body 30, and the valve body 30 quickly closes the hot water inlet 13. Becomes abnormally hot It is possible to reduce the time until the inflow of hot water is suppressed, prevent accidental hot water from flowing out to the downstream side, ensure safety, and close the mixed water flow path to prevent mixing in abnormal conditions. The delivery from the valve can also be stopped, preventing the situation where water or hot water can flow out in an abnormal state, and the mixed water delivery can be resumed when it returns to the normal state reliably, eliminating the need for extra adjustment, opening and closing operations, etc. As a result, it is possible to save labor in sending mixed water.

  In the mixing valve device according to the embodiment, the large-diameter portion 21 of the spool 20 is used as the control valve portion that closes the flow path of the mixed water when the temperature sensor 60 detects the abnormal temperature state of the mixed water. However, the present invention is not limited thereto, and the valve body is configured to prevent the mixed water from flowing out at other parts of the spool, for example, the mixed water outlet provided in the same form as the water inlet or the hot water inlet. It is also possible to control the outflow of the mixed water by adjusting the opening area by changing the position of the cylindrical peripheral side surface of the spool in the same manner as in the above embodiment. Furthermore, a valve separate from the spool may be provided in the housing, or a valve may be provided separately from the housing to control whether the mixed water flows out.

DESCRIPTION OF SYMBOLS 1 Mixing valve apparatus 10 Housing 11 Cavity part 12 Water inlet 13 Hot water inlet 14 Outlet 20 Spool 21 Large diameter part 22 Intermediate diameter part 23 Small diameter part 30 Valve body 40 Temperature sensing spring 50 Valve body holding spring 60 Temperature sensor 70 Actuator 80 Flow path

Claims (3)

Each inlet of water and hot water has a housing in which water and hot water can flow into an internal gap and a spool which is arranged in the gap of the housing so that the position can be adjusted. On the other hand, the position of the spool is adjusted so as to change the communication state between each inlet and the inside of the housing, and the mixed water at a predetermined temperature obtained by adjusting the ratio of the inflow amount of water and hot water can be sent out of the housing. In the mixing valve device
A valve body that is mounted on the spool so as to be movable within a predetermined range in the longitudinal direction of the spool, and that moves along the water and hot water inlets of the housing to open and close the inlets;
Both ends of the valve body and the spool are brought into contact with each other to press and bias the valve body in one of the longitudinal directions of the spool, and the ambient temperature is higher than the normal use temperature range of the mixed water. A temperature-sensitive spring made of a shape memory material that deforms to increase the distance between both ends when
Both ends of the valve body and the spool are brought into contact with each other to urge the valve body to the other in the longitudinal direction of the spool, and the valve body position is kept constant in the normal use temperature range of the mixed water. A valve body holding spring that allows movement of the valve body in accordance with the deformation in a high temperature deformation state of the temperature spring;
A temperature sensor for detecting the temperature of the mixed water;
An actuator for adjusting the position of the spool according to a difference between a temperature obtained by the temperature sensor and a predetermined set temperature;
When the temperature sensor detects an abnormal temperature state of the mixed water, the control valve unit closes the flow path of the mixed water and stops sending the mixed water downstream,
The hot water inlet in the housing is arranged side by side in the spool longitudinal direction with respect to the water inlet,
When the valve body that moves integrally with the spool in accordance with the position adjustment of the spool moves to one side in the longitudinal direction of the spool, the amount of flowing water increases while decreasing the inflow amount of hot water, The shape and arrangement of reducing the inflow of water while increasing the inflow of hot water,
The mixing valve device, wherein the valve element moves to one side in the spool longitudinal direction with respect to the spool in a high temperature deformation state of the temperature sensitive spring to close the hot water inlet. The mixing valve device according to claim 1,
A part of the spool also serves as the control valve, and when the temperature sensor detects an abnormal temperature state of the mixed water, the spool is positioned by an actuator to close a predetermined portion of the mixed water flow path of the housing. A mixing valve device. The mixing valve device according to claim 2,
A portion adjacent to the temperature-sensitive spring end of the spool is a large-diameter portion located on the outer peripheral side of the temperature-sensitive spring with respect to the spool central axis, and the temperature sensor detects an abnormal temperature state of the mixed water. When the spool is moved to one side in the longitudinal direction of the spool by the actuator and at least the valve body closes the hot water inlet, the end of the mixed water flow path surrounding the spool of the housing and the temperature-sensitive spring is moved to the spool. It is closed at the large diameter part of the mixing valve device.

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