JP2008267515A - Hot and cold water mixing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot and cold water mixing valve with an automatic temperature adjusting function, capable of accurately performing temperature adjusting operation by solving a problem in which a pilot valve receives pressure in a backpressure chamber and is displaced from an appropriate position by fluctuation in pressure, and thereby temperature adjusting characteristic is adversely affected. <P>SOLUTION: In this pilot hot and cold water mixing valve with the automatic temperature adjusting function, a cold water-side main valve 20 and a hot water-side main valve 22 are provided with backpressure receiving surfaces 62, 64 axially receiving pressure of cold water-side and hot water-side backpressure chambers 38, 40, and primary pressure receiving surfaces 66, 68 receiving, axially and in a direction reverse to backpressure, a primary pressure upstream of throttling parts 58, 60 in a cold water inflow passage 16 and a hot water inflow passage 18. The cold water-side and hot water-side pilot valves 54, 56 are arranged outside of the cold water-side and hot water-side backpressure chambers 38, 40 for controlling opening of cold water-side and hot water-side pilot passages 46, 48. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot and cold water mixing valve that adjusts the temperature of mixed water by moving a water side main valve and a hot water side main valve in an axial direction within a valve case to change a mixing ratio of hot water and water.

Conventionally, hot and cold water mixing valves that adjust the temperature of mixed water by changing the mixing ratio of water and hot water by moving the water side main valve and the hot water side main valve in the axial direction inside the valve case have been widely used. ing.
FIG. 15 shows a specific example of this seed hot water mixing valve.
In the figure, reference numerals 200 and 202 denote a water inflow passage and a hot water inflow passage formed in a cylindrical valve case 204, and 206 denotes a mixing chamber for mixing and outflowing the inflowing water and hot water.
208 and 210 are water side main valves and hot water side main valves provided on a temperature control shaft (temperature control shaft) 212 which are separated in the axial direction, and 214 and 216 are water side main valves 208 and hot water side main valves. They are a water side main valve seat and a hot water side main valve seat provided corresponding to the valve 210.

In this hot and cold water mixing valve, when the temperature adjustment shaft 212 is moved to the left in the drawing to the full, the hot water main valve 210 is seated on the hot water main valve seat 216 as shown in FIG. 208 is fully opened, and water from the water inflow passage 200 flows into the mixing chamber 206 and flows out toward the water discharge section.
Conversely, when the temperature control shaft 212 is moved to the right in the drawing to the full position, the water side main valve 208 is seated on the water side main valve seat 214 and the hot water side main valve 210 is full as shown in FIG. The hot water from the hot water inflow passage 202 flows into the mixing chamber 206 and flows out toward the water discharge section.

Further, when the water side main valve 208 and the hot water side main valve 210 are spaced apart from the water side main valve seat 214 and the hot water side main valve seat 216, respectively, in the middle position, that is, from the water inflow passage 200. Water and hot water from the hot water inflow passage 202 flow into the mixing chamber 206 and are mixed and flow out toward the water discharge section.
Further, the temperature control shaft 212 is moved in the left-right direction in the figure to change the opening degree of the water-side main valve 208 and the hot water-side main valve 210, so that water and hot water are mixed at a flow rate corresponding to each opening degree. It flows into 206, the temperature of mixed water is adjusted, and mixed water flows out toward a water discharge part.

In the hot and cold water mixing valve, the positions of the water side main valve 208 and the hot water side main valve 210 are determined according to the operation amount of the temperature control shaft 212 in the left-right direction in the drawing, that is, the operation amount of the handle connected thereto. A so-called mixing type hot and cold water mixing valve that mixes and discharges water and hot water accordingly. In the case of this hot and cold water mixing valve, the water side main valve 208 and the hot water side main valve against the water supply pressure and the hot water supply pressure. There is a problem that the operation resistance is large and the operation is heavy, especially when the water supply pressure is high.
Further, since the operation resistance is large, it is difficult to drive the water side main valve 208 and the hot water side main valve 210 with a small actuator.

In addition to this mixing-type hot and cold water mixing valve, the hot and cold water mixing valve includes a hot and cold water mixing valve with an automatic temperature control function, and more specifically, a temperature adjustment shaft that opens the water-side main valve in response to an increase in the temperature of the mixed water. The mixing chamber is provided with a temperature sensing body that moves the temperature control shaft, and a bias spring that urges the temperature adjustment axis in the direction in which the water side main valve closes, and based on the temperature sensing of the mixed water by the temperature sensing body. Automatic temperature with the function of automatically adjusting the opening of the water side main valve and hot water side main valve by automatically moving the valve and hot water side main valve, respectively, and automatically adjusting the temperature of the mixed water to the set temperature There is a hot and cold water mixing valve with an adjustment function.
For example, Patent Document 1 listed below discloses a hot water / water mixing valve with this type of automatic temperature control function.
Even in this hot water / water mixing valve with an automatic temperature control function (thermostat type), there is a problem that operation resistance is heavy as in the case of the mixing type hot water / water mixing valve.

In view of this, the present applicant, in a previous patent application (Patent Document 2 below), (a) a cylindrical valve case, and (b) a water inlet and a hot water inlet provided in the valve case at positions separated in the axial direction. (C) the water inflow, the water inflow passage and the hot water inflow passage following the hot water inlet, and (d) a cylindrical shape that moves in the axial direction along the inner surface of the valve case. The water side main valve and the hot water side hot water valve that increase or decrease the opening degree of the passage in the opposite relation to each other, and (e) the water side main valve and the hot water side main valve are formed behind the water side main valve. Water pressure and hot water side back pressure chambers acting as back pressure against the main valve and hot water side main valve and the closing pressure, and (f) water and hot water from the hot water inlet and hot water inlet. Water side and hot water side introduction passages that lead to the chamber to increase the pressure of the back pressure chamber, respectively, (g) Water side main valve, secondary side passage downstream of the hot water side main valve, and each back pressure chamber Water side and hot water side pilot passages as pressure release passages to communicate with each other, and (h) water side main valve and hot water side main valve move forward and backward in the forward / backward movement direction to control the opening degree of each pilot passage , And a hot water side pilot valve, and the water side main valve and the hot water side main valve are moved forward and backward to follow the movement of the pilot valve to change the mixing ratio of hot water and water to adjust the temperature of the mixed water A hot and cold water mixing valve is proposed.
FIG. 16 shows a specific example thereof (this example is an example of a hot and cold water mixing valve with an automatic temperature control function).

  In the figure, reference numeral 218 denotes a cylindrical valve case, and 220 and 222 are water inlets and hot water inlets that are spaced apart in the axial direction, and the water inlet 220 and the hot water inlet 222 are followed by water. An inflow passage 200 and a hot water inflow passage 202 are provided in the radial direction.

  224 and 226 have a cylindrical shape and move in the axial direction along the inner surface of the valve case 218, and the opening degree of the water inflow passage 200 and the hot water inflow passage 202 is increased or decreased in an inverse relationship with each other by the movement in the axial direction. A piston-type water-side main valve and a hot-water side main valve to be changed.

  228 and 230 are water-side and hot-water back pressure chambers formed behind the water-side main valve 224 and the hot water-side main valve 226, respectively. These back pressure chambers 228 and 230 control the internal pressure of the water-side main valve. It acts as a back pressure on the valve 224 and the hot water main valve 226 and a pressing force in the valve closing direction.

  232 and 234 are provided penetrating the water side main valve 224 and the hot water side main valve 226, respectively, and water and hot water from the water inlet 220 and the hot water inlet 222 are introduced into the back pressure chambers 228 and 230, respectively. 236 and 238 communicate with the secondary side passage downstream of the water side main valve 224 and the hot water side main valve 226 and the back pressure chambers 228 and 230, respectively. This is a pilot passage serving as a pressure relief passage for releasing pressure and reducing pressure.

Reference numerals 240 and 242 denote water-side and hot-water side pilot valves that move forward and backward in the same direction as the water-side main valve 224 and the hot-water side main valve 226 to change the opening degree of the pilot passages 236 and 238, respectively. 228, 230.
The pilot valves 240 and 242 are connected and integrated by a common temperature control shaft 244 that penetrates the water side main valve 224 and the hot water side main valve 226.

  Reference numeral 246 denotes a temperature-sensitive spring made of a shape memory alloy coil spring housed in the mixing chamber 206. The temperature-sensitive spring 246 is directed rightward in the figure with respect to the pilot valves 240 and 242 via the temperature adjusting shaft 244. An urging force is applied, and when the temperature of the mixed water in the mixing chamber 206 rises, the urging force expands in the axial direction to increase the rightward urging force in the figure.

  A bias spring 248 made of a coil spring is disposed in the water-side back pressure chamber 228. The bias spring 248 biases the pilot valves 240 and 242 in a direction opposite to the temperature-sensitive spring 246, that is, in the drawing. It exerts a leftward biasing force.

Reference numeral 250 denotes a rotary temperature adjustment (temperature adjustment) handle. When the temperature adjustment handle 250 is rotated, the shaft portion 252 moves forward and backward in the horizontal direction in the drawing based on the screw connection with the valve case 218.
A coil spring 254 is interposed between the shaft portion 252 and the hot water side pilot valve 242 to apply a rightward urging force to the hot water side and water side pilot valves 242 and 240. .
Here, the biasing force of the coil spring 254 is set to be weaker than the biasing force of the bias spring 248, and the difference in the spring force biases the temperature adjustment shaft 244 in the direction opposite to the temperature-sensitive spring 246. It becomes an energizing force.

In this hot and cold water mixing valve with an automatic temperature control function, when the temperature adjustment handle 250 is rotated and the temperature adjustment shaft 244 is moved to the right in the figure, for example, the water side pilot valve 240 is separated from the water side main valve 224. As a result, the opening of the pilot passage 236 increases, whereby the water in the water-side back pressure chamber 228 flows to the mixing chamber 206 side through the pilot passage 236, and the pressure in the back pressure chamber 228 decreases.
Then, the water-side main valve 224 is moved in the right direction in the figure by the water supply pressure of the water inflow passage 200 and stops at a position where the pressure of the back pressure chamber 228 and the water supply pressure of the water inflow passage 200 are balanced.
That is, following the movement of the pilot valve 240, the water-side main valve 224 moves in the same direction, increasing the opening of the water inflow passage 200 and increasing the amount of water flowing into the mixing chamber 206.

  At this time, the hot water side pilot valve 242 moves to the right in the figure, so that the opening degree of the hot water side pilot passage 238 is reduced, and the pressure in the back pressure chamber 230 is increased accordingly, and the hot water inflow passage. The hot water main valve 226 moves to the right in the drawing to a position where the hot water supply pressure from 202 and the pressure in the back pressure chamber 230 are balanced, and the opening of the hot water inflow passage 202 is made small. That is, the amount of hot water flowing into the mixing chamber 206 is reduced.

  On the other hand, when the temperature adjustment handle 250 is rotated in the direction opposite to the above, the temperature adjustment shaft 244 moves to the left in the figure, the opening degree of the water side main valve 224 is reduced, and the opening degree of the hot water side main valve 226 is increased. Is greatly changed to reduce the amount of water flowing into the mixing chamber 206 and increase the amount of hot water flowing in.

  This hot and cold water mixing valve with an automatic temperature control function changes the pressures of the water-side and hot-water back pressure chambers 228 and 230 by the movement of the water-side and hot-water pilot valves 240 and 242, and thereby the water-side main valve. 224, controlling the opening degree of the hot water main valve 226, and it is not necessary to directly open and close the water side main valve 224 and the hot water side main valve 226 against the flow pressure of water and hot water. Is small and light operation is possible.

  However, in the case of the hot water / water mixing valve shown in FIG. 16, the water side and hot water side pilot valves 240 and 242 are inserted into the back pressure chambers 228 and 230, respectively. Since the opening degree of the passages 236 and 238 is controlled, the pressure acts on the water side pilot valve 240 in the back pressure chamber 228 in the left direction in the figure. The pressure corresponding to the area corresponding to the difference between the diameters of the pilot valve seats formed in the valve 224 in the direction perpendicular to each axis acts in the left direction in the figure, and similarly, the pressure in the back pressure chamber 230 on the hot water side is changed to the pilot valve 242. In contrast, it acts in the right direction in the figure.

  As a result, when the temperature control shaft 244 is operated to operate the pilot valves 240 and 242 in the left-right direction in the figure, the operation of the back pressure chambers 228 and 230 with respect to the pilot valves 240 and 242 is performed. There is a problem that becomes heavy.

  This problem is not limited to the hot and cold water mixing valve with the automatic temperature control function shown in FIG. 16, but the water side and hot water side pilot valves are moved by moving the common temperature control shaft in the axial direction to move the water side. This is also a problem that occurs in a mixing type hot and cold water mixing valve that moves the main valve 224 and the hot water main valve 226.

  In particular, in the hot water / water mixing valve with an automatic temperature control function shown in FIG. 16, if pressure fluctuations in the back pressure chambers 228 and 230 occur due to changes in the feed water pressure and the hot water pressure, the pilot is affected by the pressure fluctuations. There arises a problem that the valves 240 and 242 are displaced from each other, thereby causing a temperature control error.

JP 2001-4050 A JP 2006-57661 A

The present invention has been made for the purpose of solving the problem that the pilot valve receives the pressure in the back pressure chamber and the operating force for the movement of the pilot valve becomes heavy.
Another object of the present invention is that, in a hot and cold water mixing valve with an automatic temperature control function, a pilot valve is displaced from an appropriate position due to pressure fluctuations in the back pressure chamber, thereby impairing temperature control characteristics. It is an object of the present invention to provide a hot and cold water mixing valve with an automatic temperature control function capable of preventing temperature and performing a temperature control operation with high accuracy.

  Accordingly, the present invention comprises (a) a cylindrical valve case, (b) a water inlet and a hot water inlet provided in the valve case at positions separated in the axial direction, and (c) Water inflow, water inflow passage and hot water inflow passage following the hot water inlet, and (d) a cylindrical shape that moves in the axial direction along the inner surface of the valve case and opens the water inflow passage and the hot water inflow passage. And (e) formed behind each of the water side main valve and the hot water side main valve, and the internal pressure is changed to the water side. Water pressure, hot water side back pressure chamber acting as back pressure against the main valve and hot water side main valve and closing pressure, and (f) water and hot water from the water inlet and hot water inlet. , An introduction passage that leads to the back pressure chamber on the hot water side and increases the pressure of the back pressure chamber, and (g) the secondary passage on the downstream side of the water side main valve and the hot water side main valve, and the water side. A water side, a hot water side pilot passage, and (h) the water side main valve and the hot water side main valve, which move forward and backward in the direction of advancing and retreating, , A water-side pilot valve for controlling the opening of the pilot passage on the hot water side, and a pilot valve on the hot water side. In a hot and cold water mixing valve that adjusts the temperature of mixed water by moving the main valve forward and backward to change the mixing ratio of hot water and water, the water side main valve and the hot water side main valve include the back pressure chamber of the water side and hot water side, respectively. A back pressure receiving surface for receiving pressure in the axial direction is provided, and a throttle portion for restricting the flow is provided on the water inflow passage and the hot water inflow passage. A primary pressure receiving surface that receives a primary pressure upstream of the throttle portion in the water inflow passage and the hot water inflow passage in an axial direction and in a direction opposite to the back pressure is provided. The pilot valves for the water and hot water are arranged outside the back pressure chamber for the water and hot water, and the pilot passages for the water and hot water are opened outside the back pressure chamber. It is characterized by being controlled.

  According to a second aspect of the present invention, in the first aspect, the water side main valve and the hot water side main valve are separated from each other in the axial direction, and the water side main valve and the hot water side main valve move independently of each other. It is characterized by being a thing.

  The invention according to claim 3 includes (a) a cylindrical valve case, (b) a water inlet and a hot water inlet provided in the valve case at positions spaced apart from each other in the axial direction, and (c) the inflow of water. The water inflow passage and the hot water inflow passage that follow the hot water inlet, and (d) the axial movement inside the valve case changes the opening of the water inflow passage and the hot water inflow passage to be large or small in an inverse relationship with each other. A hot water mixing valve that adjusts the temperature of the mixed water by changing the mixing ratio of hot water and water by moving the water side main valve and the hot water main valve. The water side main valve and the hot water side main valve are integrally moved in the axial direction, and either the water side main valve or the hot water side main valve is axially moved along the inner surface of the valve case. And (a) the internal pressure behind the drive valve is a back pressure against the drive valve. And (b) introducing water or hot water from the water inflow passage or hot water inflow passage corresponding to the drive valve into the back pressure chamber. An introduction passage for increasing the pressure in the pressure chamber, (c) a secondary passage on the downstream side of the drive valve, and a pilot passage as a pressure release passage communicating with the back pressure chamber; (d) the drive valve; A pilot valve that moves forward and backward in the forward / backward movement direction and controls the opening degree of the pilot passage, and makes the drive valve move forward and backward by following the forward / backward movement of the pilot valve. One of the water side main valve or the hot water side main valve and the other are moved together, and the drive valve is provided with a back pressure receiving surface that receives the pressure of the back pressure chamber in the axial direction, The flow is restricted in the water inflow passage or hot water inflow passage corresponding to the drive valve. A throttle portion is provided, and the drive valve is provided with a primary pressure receiving surface that receives a primary pressure upstream of the throttle portion in an axial direction and in a direction opposite to the back pressure, and further, the pilot valve Is arranged outside the back pressure chamber, and the opening of the pilot passage is controlled outside the back pressure chamber.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the throttle portion is constituted by a projecting portion provided in the drive valve in a state of projecting into the water inflow passage or the hot water inflow passage. Features.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the hot and cold water mixing valve extends in the axial direction in response to an increase in the temperature of the mixed water and opens the water side main valve with respect to the pilot valve. A temperature sensing element for increasing the urging force is provided in the mixing chamber, and a bias spring for urging the pilot valve is provided in a direction in which the water side main valve is closed, and the automatic temperature control function is provided. Features.

Effects and effects of the invention

  As described above, according to the first aspect of the present invention, the water side main valve and the hot water side main valve are provided with the back pressure receiving surface for receiving the pressure of the back pressure chamber in the axial direction, and the throttle portion is provided on the water inflow passage and the hot water inflow passage. The primary pressure receiving surface that receives the upstream primary pressure in the axial direction and in the direction opposite to the back pressure is provided in each of the water side main valve and the hot water side main valve, and on the water side and hot water side. Each pilot valve is arranged outside the back pressure chamber, and the opening of the pilot passages on the water side and the hot water side is controlled outside the back pressure chamber.

  In the hot and cold water mixing valve according to the first aspect, since the pilot valve is located outside the back pressure chamber and the opening of the pilot passage is controlled outside the back pressure chamber, the pressure of the back pressure chamber acting on the pilot valve is controlled. Since the influence of the force based on the pressure is small, and the pressure of the back pressure chamber acts on the pilot valve, it is possible to avoid an increase in operation when the pilot valve is moved.

  Further, according to claim 5, when the hot and cold water mixing valve has an automatic temperature control function, even when pressure fluctuations in the water pressure and hot water back pressure chambers occur due to fluctuations in the feed water pressure and hot water pressure, It is possible to prevent the water-side and hot-water side pilot valves from being displaced from the adjustment position due to the pressure fluctuation, and thus the mixed water temperature can be automatically adjusted to the set temperature with high accuracy.

In the present invention, the water-side main valve and the hot water-side main valve have a back pressure receiving surface that receives the pressure of the back pressure chamber in the axial direction, and the primary pressure upstream of the throttle portion in the water inflow passage and the hot water inflow passage in the axial direction. And it comprises as a primary pressure receiving surface received in a direction opposite to a back pressure chamber.
Therefore, in this first aspect, the water side main valve and the hot water side main valve are moved in the axial direction so as to balance the back pressure and the primary pressure of the back pressure chamber, respectively. And the opening degree of the water inflow passage and the hot water inflow passage is controlled.

  Therefore, in this first aspect, the water side main valve and the hot water side main valve can be configured to move integrally in the axial direction, or according to claim 2, the water side main valve and the hot water side main valve are pivoted. The water-side main valve and the hot water-side main valve can also be configured to move independently from each other in the axial direction.

For example, when the water side hot water valve and the hot water side main valve do not have a primary pressure receiving surface that receives the primary pressure in the axial direction and in the direction opposite to the back pressure, the water side main valve and the hot water side main valve move together in the axial direction. It is necessary to configure it to be in a state to perform.
By doing in this way, the water side main valve and the hot water side main valve are moved in the axial direction by the pressure balance of the water side and hot water side back pressure chambers, and the water side main valve and the hot water side main valve are moved. It becomes possible to change the opening degree of the water side inflow passage and the hot water side inflow passage large or small in an inverse relationship.

  However, when the water side main valve and the hot water side main valve are provided with the primary pressure receiving surface that receives the primary pressure in the direction opposite to the back pressure receiving surface according to this claim 1, the water side main valve and the hot water side main valve are provided. It is not necessary to integrate the movement in the axial direction, and it is possible to separate them and move them in the axial direction independently of each other.

  Thus, when the water side main valve and the hot water side main valve can be independently moved in the axial direction in accordance with the second aspect of the present invention, when the water supply pressure or the hot water supply pressure changes, the respective pressure changes Accordingly, it is possible to independently move the water side main valve and the hot water side main valve to appropriate positions.

Next, according to a third aspect of the present invention, the water side main valve and the hot water side main valve are integrally moved in the axial direction, and one of the main valves is moved in the axial direction along the inner surface of the valve case. A pilot pressure type drive valve, a back pressure chamber on the side of the drive valve, an introduction passage for increasing the pressure of the back pressure chamber, a pilot passage for reducing the pressure of the back pressure chamber, and opening of the pilot passage And a pilot valve for controlling the degree of water to constitute a hot and cold mixing valve, and the drive valve is provided with a back pressure receiving surface and a primary pressure receiving surface in the same manner as in claim 1, and the pilot valve is connected to the back of the pilot valve. The opening of the pilot passage is controlled outside the pressure chamber.
Also in this third aspect, the influence of the force based on the pressure of the back pressure chamber acting on the pilot valve is reduced, and the pilot valve is displaced due to the pressure fluctuation of the water supply pressure or the hot water supply pressure. It is possible to effectively prevent adverse effects on the above.

  According to the third aspect of the present invention, the back pressure chamber, the introduction passage, the pilot passage, and the pilot valve need only be provided on either the water side or the hot water side, so that the configuration of the hot water / water mixing valve can be simplified.

  In addition, just by controlling the position of either the water-side main valve or the hot water-side main valve with one pilot valve, the position of the other main valve can be automatically linked and controlled. It is possible to suppress adverse effects on the temperature control characteristics due to subtle misalignment of the water side and hot water side pilot valves with respect to each of the side main valves.

In the third aspect, the hot and cold water mixing valve can be a hot and cold water mixing valve having an automatic temperature control function according to the fifth aspect.
In this case, since the influence of the force based on the pressure of the back pressure chamber acting on the pilot valve is small, the pilot valve is displaced from the proper position due to the pressure fluctuation of the back pressure chamber, thereby adversely affecting the temperature control characteristics. Can be avoided.

  In addition, in this hot and cold water mixing valve with an automatic temperature control function, the movement of the main valve can be controlled by a pilot valve. Therefore, in the case where a temperature sensitive spring made of a shape memory alloy coil spring is used as a temperature sensitive body. Since the temperature-sensitive spring and the bias spring may be small in spring force, small springs can be used as these springs. In addition, since the pilot valve is disposed outside the back pressure chamber, the pilot valve itself The hot water / water mixing valve can be further downsized as a whole.

  In the first to third aspects of the present invention, the main valve can be provided with a projecting portion in a state of projecting to the inflow passage side, and the throttling portion can be configured by the projecting portion (claim 4).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 conceptually shows a hot and cold mixing valve with an automatic temperature control function according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a cylindrical valve case, and a water inlet 12 and an axially spaced position are provided. The hot water inlet 14 and the water inflow passage 16 and the hot water inflow passage 18 subsequent thereto are provided in the radial direction.

20 and 22 are cylindrical and are water side main valves and hot water side main valves which are provided so as to be movable in the axial direction along the inner surface of the valve case 10. Here, the water side main valve 20 and the hot water side main valve are provided. 22 are separated in the axial direction, and each is independently movable in the axial direction.
Each of the water side main valve 20 and the hot water side main valve 22 has large diameter portions 24 and 26 and small diameter portions 28 and 30, respectively, and the large diameter portions 24 and 26 are annular formed in the valve case 10. The recesses 32 and 34 are movable in the axial direction.

  Further, the small diameter portions 28 and 30 are fitted to the inner surface of the valve case 10 through a seal ring 36 fitted thereto so as to be watertight and slidable in the axial direction.

Between the water side main valve 20 and the valve case 10 and between the hot water side main valve 22 and the valve case 10, a water side back pressure is placed behind the water side main valve 20 and the hot water side main valve 22. A chamber 38 and a hot water-side back pressure chamber 40 are formed.
These back pressure chambers 38 and 40 cause the internal pressure to act as a back pressure on the water side main valve 20 and the hot water side main valve 22 and a pressing force in the valve closing direction.

As shown in FIG. 3, between the outer peripheral surface of the large-diameter portion 24 of the water-side main valve 20 and the valve case 10, a water-side introduction passage that guides water from the water inlet 12 to the back pressure chamber 38. 42 is formed between the outer peripheral surface of the large-diameter portion 26 of the hot water main valve 22 and the valve case 10, and the hot water side introduction passage for guiding hot water from the hot water inlet 14 to the back pressure chamber 40. 44 is formed.
The back pressure chambers 38, 40 increase the internal pressure by introducing water from the water inlet 12 and hot water from the hot water inlet 14 through the introduction passages 42, 44.

  Each of the water side main valve 20 and the hot water side main valve 22 is a pressure relief passage that allows the back pressure chambers 38 and 40 to communicate with the secondary side passage downstream of the water side main valve 20 and the hot water side main valve 22. A water-side pilot passage 46 and a hot water-side pilot passage 48 are provided so as to penetrate the water-side main valve 20 and the hot water-side main valve 22 in the radial direction.

  Here, as shown in FIG. 3, the pilot passages 46 and 48 each have an L-shaped cross section, and the openings 50 and 52 to the secondary passages are laterally directed. That is, the water-side pilot passage 46 has an opening 50 facing leftward in the drawing, and the hot water-side pilot passage 48 has an opening 52 facing rightward in the drawing.

  In this example, the pilot passage 46 on the water side and the pilot passage 48 on the hot water side are formed annularly around the axis of the water side main valve 20 and the hot water side main valve 22, respectively. However, these pilot passages 46 and 48 can be partially formed as small holes at predetermined locations in the circumferential direction.

  In FIG. 3, reference numeral 54 denotes a water-side pilot valve, which is provided so as to be movable in the axial direction of the valve case 10. This pilot valve 54 moves forward and backward in the axial direction, that is, in the left-right direction in FIG. The opening of 46 (the degree of release to the secondary passage) is changed.

  A hot water side pilot valve 56 is also provided so as to be movable in the axial direction of the valve case 10, and the pilot valve 56 moves back and forth in the axial direction, that is, in the horizontal direction in FIG. The opening degree of the passage 48 is changed.

As shown in FIG. 3, the water-side main valve 20 is provided with a protrusion that protrudes toward the water inflow passage 16, and the protrusion forms a throttle portion 58 that restricts the flow of the water inflow passage 16. Yes.
Similarly, the hot water main valve 22 is provided with a protrusion that protrudes toward the hot water inflow passage 18, and the protrusion forms a throttle portion 60 that restricts the flow of the hot water inflow passage 18.

Due to the presence of the throttle portion 58, the water inflow passage 16 becomes a primary passage upstream from the throttle portion 58, and the primary pressure is axially applied to the water-side main valve 20 on the upstream side of the throttle portion 58 in the left direction in the drawing. Act on. In the figure, reference numeral 66 denotes a primary pressure receiving surface for receiving the primary pressure in the water side main valve 20 in the axial direction.
In the drawing, the right surface of the lower portion of the water-side main valve 20 below the throttle portion 58 represents the secondary pressure receiving surface 70 that receives the secondary pressure in the left direction in the drawing.

On the other hand, the hot water inflow passage 18 is also provided with a throttle 60 in the hot water main valve 22 so that a portion upstream of the throttle 60 becomes a primary passage, and a portion downstream of the throttle 60 has a portion downstream thereof. It becomes a secondary side passage.
The hot water side main valve 22 receives the primary pressure in the right direction in the figure at a portion above the throttle portion 60. In the figure, reference numeral 68 denotes a primary pressure receiving surface that receives the primary pressure in the axial direction.
Reference numeral 72 denotes a secondary pressure receiving surface of the hot water main valve formed below the throttle portion 60.

  In this embodiment, the water-side main valve 20 receives the primary pressure and the secondary pressure in the left direction in the drawing with the primary pressure receiving surface 66 and the secondary pressure receiving surface 70 on the right side in the drawing, and the back pressure receiving on the left side in the drawing. As a result of receiving the back pressure from the back pressure chamber 38 in the right direction in the figure by the surface 62, the water side main valve 20 moves in the right and left direction in the figure so as to balance the primary pressure, the secondary pressure and the back pressure. .

  Similarly, the hot water main valve 22 receives the primary pressure and the secondary pressure in the right direction on the left primary pressure receiving surface 68 and the secondary pressure receiving surface 72 in the drawing, and the back pressure on the right back pressure receiving surface 64 in the drawing. As a result of receiving the back pressure from the chamber 40 in the left direction in the figure, the hot water side main valve 22 balances the primary pressure, the secondary pressure and the back pressure in the right and left direction in the figure and the water side main valve 20. Move independently.

The pressure in the water-side back pressure chamber 38 is changed by moving the water-side pilot valve 54 back and forth in the left-right direction in the figure and increasing or decreasing the amount of water that escapes from the back-pressure chamber 38.
Similarly, the pressure in the hot water-side back pressure chamber 40 is also changed by increasing or decreasing the amount of water (hot water) that escapes from the back pressure chamber 40 as the hot water pilot valve 56 moves forward and backward in the horizontal direction in the figure. It is done.
That is, the water-side main valve 20 is moved forward and backward in the same direction as the pilot valve 54 by following the movement of the water-side pilot valve 54 in the left-right direction in the figure.

Similarly, the hot water side main valve 22 is also moved back and forth in the same direction following the back and forth movement of the hot water side pilot valve 56 in the horizontal direction in the figure.
Then, the opening degree of the water inflow passage 16 is changed by the forward and backward movement of the water side main valve 20 in the horizontal direction in the figure, and the opening degree of the hot water inflow passage 18 is changed by the forward and backward movement of the hot water side main valve 22. I'm damned.

In FIG. 2, reference numeral 74 denotes a temperature adjustment axis (temperature adjustment axis) for setting or changing the temperature of the mixed water by moving the pilot valves 54 and 56 in the axial direction. The sleeves 76-1, 76-2, and 76-3 are fitted in an externally fitted state.
Here, the sleeve 76-1 in the middle in the figure is fitted so as to be slidable in the axial direction with respect to the temperature adjusting shaft 74, and the sleeve 76-2 on the left in the figure is positioned at the left end position in the figure by a retaining ring 80. The right sleeve 76-3 has a right end position in the drawing defined by a retaining ring 78.

  A cylindrical pilot valve body 82 is integrally formed on the sleeve 76-1 via an arm 84 extending in the radial direction. The pilot valve body 82, that is, the water side pilot valve 54 and the hot water side pilot valve are integrally formed. 56 can be moved relative to the temperature adjusting shaft 74 in the left-right direction in the drawing integrally with the sleeve 76-1.

Stepped portions 88 and 90 are formed on the left end side and the right end side of the sleeve 76-1 in the drawing.
A temperature-sensitive spring 98 made of a shape memory alloy coil spring is interposed between the stepped portion 90 and the large-diameter flange portion 96 of the sleeve 76-3 on the right side in the figure. The urging force is exerted on the sleeve 76-1, that is, on the water side pilot valve 54 and the hot water side pilot valve 56 integral with the sleeve 76-1, leftward in the figure.
That is, the biasing force is exerted in the direction of opening the water side main valve 20 and closing the hot water side main valve 22.

When the temperature of the mixed water in the mixing chamber 102 in the valve case 10 shown in FIG. 1 rises, the temperature sensitive spring 98 extends in the axial direction and increases the urging force in the left direction in the figure.
That is, the urging force in the direction of opening the water side main valve 20 and closing the hot water side main valve 22 is increased.

  On the other hand, a bias spring 94 made of a coil spring is interposed between the stepped portion 88 on the left end side of the sleeve 76-1 and the large-diameter flange portion 92 of the left sleeve 76-2. The biasing force by the bias spring 94 exerts on the sleeve 76-1, that is, the water side pilot valve 54 and the hot water side pilot valve 56, in the right direction in the figure, which is opposite to the biasing force by the temperature sensing spring 98. Has been.

In this embodiment, a temperature-sensitive spring 98 and a bias spring 94 are arranged on both sides in the axial direction with respect to the pilot valves 54 and 56 in a state in which the respective urging forces act in opposite directions to each other. 54 and 56 are held by a temperature control shaft 74 together with a sleeve 76-1 integrally provided so that the pilot valves 54 and 56 balance the biasing force of the temperature-sensitive spring 98 and the biasing force of the bias spring 94. The temperature adjustment shaft 74 moves in the left-right direction in the figure.
Here, the temperature-sensitive spring 98 and the bias spring 94 cause the biasing forces to act on the pilot valves 54 and 56 in opposite directions while keeping the total length constant.

  In this embodiment, a temperature control shaft 74, a sleeve 76-1 fitted to the temperature control shaft 74, pilot valves 54 and 56 integral with the temperature control shaft 74, sleeves 76-2 and 76-3, a temperature sensitive spring 98, and a bias spring 94 are provided. As a whole, a pilot valve unit 100 as one assembly is configured.

As shown in FIG. 1, both ends of the temperature adjusting shaft 74 are fitted into the fitting holes 104 of the valve case 10 and are screwed into the female screw portion 108 of the valve case 10 at the male screw portion 106. .
Accordingly, when the temperature control shaft 74 is rotated, the entire pilot valve unit moves back and forth in the left-right direction in the figure, thereby moving the water side pilot valve 54 and the hot water side pilot valve 56 in the axial direction.
A space between the left end portion of the temperature control shaft 74 in the drawing and the fitting hole 104 of the valve case 10 is sealed with a ring-shaped seal member 110 in a watertight manner.

Next, the operation of the hot and cold water mixing valve of this embodiment will be described.
FIGS. 1 and 3 (I) show a state in which both the water-side main valve 20 and the hot water-side main valve 22 are open, and the water-side pilot valve 54 and the hot water-side pilot valve 56 corresponding to this state are both. The opened state is shown.
In this state, water from the water inlet 12 and hot water from the hot water inlet 14 flow into the valve case 10 and are mixed in the mixing chamber 102, and the mixed water flows out to the right as indicated by the arrows in FIG. The

At this time, when the temperature of the mixed water in the mixing chamber 102 is higher than the temperature set by operating the temperature adjusting shaft 74, the temperature-sensitive spring 98 expands in response to the temperature and increases the urging force in the left direction in the figure. .
As a result, the pilot valves 54 and 56 on the water side and the hot water side move leftward in the figure, increasing the opening degree of the pilot passage 46 on the water side and changing the opening degree of the pilot passage 48 on the hot water side small.

  Then, the pressure in the water-side back pressure chamber 38 is reduced, the primary pressure in the primary-side passage in the water inflow passage 16 is relatively increased, and the water-side main valve 20 is moved from the position shown in FIG. As shown in FIG. 3 (II), it moves to the left in the figure and stops at a position where the pressure in the back pressure chamber 38, the primary side pressure, and the secondary side pressure balance.

On the other hand, the pressure of the back pressure chamber 40 is increased by decreasing the opening degree of the pilot passage 48 on the hot water side. As a result, the hot water main valve 22 is connected to the pressure in the back pressure chamber 40 and the primary side in the hot water inflow passage 18. Move to the left in the figure so as to balance the pressure and the secondary side pressure downstream of the throttle 60, change the opening of the hot water inflow passage 18 to a small amount, and flow of hot water from the hot water inlet 14 The amount is decreased to lower the mixed water temperature (FIG. 4 (III)).
When the mixed water temperature matches the set temperature, the pilot valves 54 and 56, the water-side main valve 20, and the hot water-side main valve 22 are stopped, and the mixed water temperature is maintained at the set temperature.

  When the temperature adjustment shaft 74 is rotated to change the position in the axial direction and the set temperature is changed, the water-side main valve 20 and the hot water-side main valve 22 are changed according to the positions of the pilot valves 54 and 56 moved accordingly. Changes the axial position, changes the ratio of the inflow amount of water from the water inlet 12 and the inflow amount of hot water from the hot water inlet 14 in accordance with the set temperature, and matches the mixed water temperature to the set temperature.

  In the hot and cold water mixing valve of the present embodiment as described above, the water side and hot water side pilot valves 54 and 56 are located outside the water side and hot water side back pressure chambers 38 and 40, respectively. Since the influence of the force based on the pressure of the back pressure chambers 38 and 40 is small, the resistance when the pilot valves 54 and 56 are moved is small, and in addition to being able to operate this lightly, Even when pressure fluctuations in the back pressure chambers 38 and 40 occur due to fluctuations in the hot water supply pressure, the pilot valves 54 and 56 are not displaced from the adjustment position due to the pressure fluctuations. Nevertheless, the mixed water temperature can be adjusted to the set temperature appropriately and with high accuracy.

  Moreover, in this embodiment, each of the water side main valve 20 and the hot water side main valve 22 is provided with the back pressure receiving surfaces 62 and 64, the primary pressure receiving surfaces 66 and 68, and the secondary pressure receiving surfaces 70 and 72, and those pressure balances. Therefore, the water-side main valve 20 and the hot water-side main valve 22 can be separated in the axial direction so that each can be moved independently.

  Thus, even when the water supply pressure or the hot water supply pressure changes to change the amount of water and hot water flowing in from the water inlet 12 and the hot water inlet 14, the pressure changes accordingly. The water-side main valve 20 and the hot water-side main valve 22 can be independently moved to appropriate positions according to the pressures of the back pressure chambers 38 and 40, and the mixed water temperature is automatically set to a set temperature with high accuracy. It becomes possible to adjust.

Next, FIGS. 5 and 6 conceptually show a hot and cold water mixing valve according to another embodiment of the present invention.
In this example, the outer surface of a pilot valve body 82 having a cylindrical shape is fitted to the inner surface of the valve case 10 in a watertight and slidable manner via a seal ring 36, and this pilot valve body 82, specifically the water side In this example, water-side and hot-water side pilot passages 46 and 48 are formed between the hot-water side pilot valves 54 and 56 and the water-side main valve 20 and the hot-water side main valve 22.
Also in this example, the water-side and hot water-side pilot valves 54 and 56 are moved in the axial direction, so that the opening degree of the water-side and hot water-side pilot passages 46 and 48 is changed in a reverse relationship.
The other points are the same as described above.

7 and 8 conceptually show a hot and cold water mixing valve according to another embodiment of the present invention.
In this example, a cylindrical water-side main valve 20 is integrally formed with a hot water-side main valve 22, and the water-side main valve 20 and the hot water-side main valve 22 are integrally moved in the axial direction. It is.
In this example, the hot water side main valve 22 functions as a drive valve, and the hot water side main valve 22 moves following the axial movement of the hot water side pilot valve 56 so that the hot water side main valve 22 and the water side main valve 22 are moved. The entire side main valve 20 is moved (driven) in the axial direction.

  Therefore, in this embodiment, only the hot water side pilot valve 56 is provided on the cylindrical pilot valve body 82 shown in FIG. 8, and the hot water side back pressure chamber 40 and the hot water side communicating with this are correspondingly provided. Only the introduction passage 44 is provided. That is, on the water side, the back pressure chamber 38, the introduction passage 42, the throttle portion 58 and the like in the above embodiment are not provided.

  In this embodiment, only the position of the hot water main valve 22 is controlled by one pilot valve 56 on the hot water side, and the other water side main valve 20 can be automatically moved in conjunction with the water side. As in the case where a pair of pilot valves is provided corresponding to the main valve 20 and the hot water side main valve 22, the positional relationship between each pilot valve and the water side and hot water side main valves is not complicated. It can be avoided that the relative positional relationship between the valve and each main valve slightly shifts in position and this affects the temperature control characteristics. In addition, the configuration of the hot and cold mixing valve can be simplified.

  9 and 10 show the hot and cold water mixing valve of the second embodiment shown in FIGS. 5 and 6 in a specific shape and structure, and the basic function and structure of the second embodiment are shown in FIGS. The corresponding parts are indicated only by the reference numerals, detailed description of the same parts is omitted, and only the differences will be described below.

In the figure, reference numeral 112 denotes a rotation operation shaft, which has a cylindrical portion 114, and an operation force transmission member 118 having a cylindrical shape is provided on the inside thereof.
Here, a female screw 116 is provided on the inner surface of the cylindrical portion 114 of the rotary operation shaft 112, and a male screw 120 is provided on the outer surface of the transmission member 118.

An engagement protrusion 122 extending in the axial direction is provided on the inner surface of the transmission member 118, and the engagement protrusion 122 can slide in an axial engagement groove 124 formed on the outer surface of the valve case 10. The transmission member 118 is restricted from rotating with respect to the valve case 10 by the engagement between the engagement convex portion 122 and the engagement groove 124.
Therefore, when the operation shaft 112 is rotated, the transmission member 118 is moved forward and backward in the left-right direction in the drawing by screw feed based on the screwing of the male screw 120 and the female screw 116.

  A second transmission member 126 that also has a cylindrical shape is provided on the further inner side of the transmission member 118, and a temperature control shaft that protrudes through the valve case 10 in the axial direction with respect to the transmission member 126. A left end portion of 74 in the drawing is fastened and fixed so as to move integrally in the axial direction.

Here, a buffer spring 128 made of a coil spring is interposed between the transmission members 118 and 126, and transmission of an axial force from the transmission member 118 to the transmission member 126 is performed via the buffer spring 128. Done.
In this embodiment, the transmission members 118 and 126 move back and forth in the axial direction without rotation when the rotation operation shaft 112 is rotated.

  In this embodiment, when the rotation operation shaft 112 is rotated, the operation force is transmitted to the temperature adjustment shaft 74 via the transmission member 118, the buffer spring 128, and the transmission member 126, and the temperature adjustment shaft 74, that is, the pilot valve unit 100. Is moved back and forth in the left-right direction in the figure.

Next, FIGS. 11 and 12 show the hot and cold water mixing valve of the embodiment shown in FIG. 1 with a specific shape and structure, and the basic function and structure are the same as those of the first embodiment. .
The operation device for the temperature control shaft 74 is the same as that shown in FIG.

  In this embodiment, as shown in FIG. 11 and FIG. 12, the water-side main valve 20 and the hot water-side main valve 22 are provided in the center side and are radiated in the radial direction with respect to the cylindrical portion 129 that is fitted around the sleeve 76-1. 12 and the water-side and hot-water side pilot passages 46 and 48 shown in FIG. 12 (A) are each provided in the circumferential direction with a single hole shape in the radial direction. The openings 50 and 52 are opened sideways in the axial direction.

On the other hand, the sleeve 76-1 slidably fitted to the temperature control shaft 74 is provided with an annular projecting portion at a substantially intermediate portion in the axial direction, and this projecting portion serves as a pilot valve element 82. In the figure, water-side and hot-water pilot valves 54 and 56 are formed at the right end and the left end, respectively.
As shown in FIG. 12A, the pilot valves 54 and 56 are opposed to the openings 50 and 52 of the corresponding pilot passages 46 and 48 on the water side and the hot water side in the axial direction.
In this embodiment, the pilot valve body 82 has a small diameter, and on the radially outer side of the pilot valve body 82, a passage 134 (FIG. 12B) is formed inside the water side main valve 20 and the hot water side main valve 22. Reference) is formed.

  In the embodiment of FIG. 1, the pilot valve body 82 has a large diameter, and accordingly, an arm for connecting the pilot valve body 82 and the sleeve 76-1 in the radial direction is required. However, in this embodiment, the pilot valves 54 and 56 are configured to have a small diameter, and the flow of the hot water flows outside the pilot valves 54 and 56. Since the passage 134 is formed, it is possible to effectively avoid the problem that the pilot valves 54 and 56 are displaced by the flow of hot water.

Next, FIGS. 13 and 14 show the hot water / water mixing valve conceptually shown in FIGS. 7 and 8 in a specific shape and structure, and the basic function and structure are the same as those. Only the corresponding parts are denoted by reference numerals, and detailed description is omitted.
The operating device for the temperature control shaft 74 is the same as that shown in FIG.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, in the above-described embodiment, all the protrusions forming the throttle portion are provided on the main valve side. However, in some cases, a protrusion may be provided on the valve case side to be the throttle portion.
Moreover, in the said embodiment, although the coil spring made from a shape memory alloy is used as a temperature sensing body, a thermo wax and other temperature sensing bodies can also be used depending on the case.
Further, in the examples shown in FIGS. 8, 13 and 14, the water side main valve can be configured as a driving valve and the hot water side main valve as a non-driving valve can be formed integrally therewith. The present invention can be configured in various forms without departing from the gist of the present invention, such as being applicable to a mixing type hot / cold water mixing valve having no adjustment function.

It is sectional drawing of the hot and cold water mixing valve which is one embodiment of the present invention. It is the figure which showed the pilot valve unit in the hot / cold water mixing valve of the embodiment. It is operation | movement explanatory drawing of the hot water mixing valve of the embodiment. FIG. 4 is an operation explanatory diagram following FIG. 3. It is a figure of other embodiment of this invention. It is a principal part enlarged view of FIG. It is a figure of other embodiment of this invention. It is a principal part enlarged view of further another embodiment of this invention. It is a figure of other embodiment which represented embodiment of FIG. 5 by the specific shape and structure. It is a principal part enlarged view of FIG. It is a figure of other embodiment which represented embodiment of FIG. 1 by the specific shape and structure. It is a principal part enlarged view of FIG. 11, and the front view of a main valve. It is a figure of other embodiment which represented embodiment of FIG. 7 by the specific shape and structure. It is a principal part enlarged view of FIG. 13, and the front view of a main valve. It is the figure which showed an example of the conventional hot water mixing valve. It is the figure which showed another example of the conventional hot water mixing valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Valve case 12 Water inlet 14 Hot water inlet 16 Water inflow passage 18 Hot water inflow passage 20 Water side main valve 22 Hot water side main valve 38, 40 Back pressure chamber 42, 44 Introduction passage 46, 48 Pilot passage 54, 56 Pilot valve 58 , 60 Throttle part 62, 64 Back pressure receiving surface 66, 68 Primary pressure receiving surface 82 Pilot valve element 94 Bias spring 96 Temperature sensitive spring

Claims (5)

(B) a cylindrical valve case, (b) a water inlet and a hot water inlet provided in the valve case at positions spaced apart in the axial direction, and (c) water inflow and water inflow following the hot water inlet. A passage and a hot water inflow passage, and (d) a cylindrical shape, which moves in the axial direction along the inner surface of the valve case, and the opening degree of the water inflow passage and the hot water inflow passage changes in a large or small relationship in an opposite relationship to each other. A water-side main valve and a hot water-side main valve, and (e) a back pressure against the water-side main valve and the hot water-side main valve formed behind each of the water-side main valve and the hot water-side main valve. And a back pressure chamber on the water side and hot water side that acts as a pressing force in the valve closing direction, and (f) water and hot water from the water inlet and hot water inlet are led to the water side and hot water side back pressure chamber. An introduction passage for increasing the pressure of the back pressure chamber, and (g) a secondary passage on the downstream side of the water side main valve and the hot water side main valve and the water side and hot water side back pressure chambers are connected. Passed (H) The water side and hot water side pilot passages move forward and backward in the forward and backward movement directions of the water side and hot water side pilot passages. A water-side and hot-water side pilot valve for controlling the water-side and hot-water side pilot valves, and the water-side main valve and the hot-water side main valve are moved forward and backward to follow the forward and backward movement of the water-side and hot water-side pilot valves. In a hot water mixing valve that adjusts the temperature of mixed water by changing the mixing ratio, the water side main valve and the hot water side main valve have a back pressure receiving surface that receives the pressure of the back pressure chamber on the water side and hot water side in the axial direction. And a throttle portion for restricting the flow is provided on the water inflow passage and the hot water inflow passage, and the throttling in the water inflow passage and the hot water inflow passage is provided in the water side main valve and the hot water side main valve. A primary pressure receiving surface that receives the primary pressure upstream of the portion in the axial direction and in the direction opposite to the back pressure, and is provided on the water side and the hot water side. The pilot valve is arranged outside the back pressure chamber on the water side and the hot water side, and the opening of the pilot passage on the water side and the hot water side is controlled outside the back pressure chamber. A hot and cold water mixing valve.   In Claim 1, the water side main valve and the hot water side main valve are separated from each other in the axial direction, and the water side main valve and the hot water side main valve are moved independently of each other. A hot and cold water mixing valve. (B) a cylindrical valve case, (b) a water inlet and a hot water inlet provided in the valve case at positions spaced apart in the axial direction, and (c) water inflow and water inflow following the hot water inlet. A passage and a hot water inflow passage; and (d) a water side main valve and hot water that move in the axial direction inside the valve case and change the opening degree of the water inflow passage and the hot water inflow passage to be large or small in the opposite relation to each other. A hot water mixing valve that adjusts the temperature of the mixed water by changing the mixing ratio of hot water by moving the water side main valve and the hot water main valve,
The water side main valve and the hot water side main valve are integrally moved in the axial direction, and either the water side main valve or the hot water side main valve is pivoted along the inner surface of the valve case. (A) a back pressure chamber in which the internal pressure acts as a back pressure against the drive valve and a pressing force in the valve closing direction behind the drive valve. (B) an introduction passage for introducing water or hot water from the water inflow passage or hot water inflow passage corresponding to the drive valve into the back pressure chamber to increase the pressure of the back pressure chamber; ) A pilot passage serving as a pressure relief passage communicating with the secondary pressure passage downstream of the drive valve and the back pressure chamber; and (d) moving forward and backward in the forward and backward movement direction of the drive valve to open the pilot passage. And a pilot valve for controlling the degree of movement, and the drive valve is moved in accordance with the forward / backward movement of the pilot valve. By withdrawal movement, without the one and the other of the water-side main valve or the hot water side main valve forms the driven valve to move together,
The drive valve is provided with a back pressure receiving surface that receives the pressure of the back pressure chamber in the axial direction, and a throttle portion for restricting the flow is provided in the water inflow passage or the hot water inflow passage corresponding to the drive valve. The drive valve includes a primary pressure receiving surface that receives a primary pressure upstream of the throttle portion in an axial direction and in a direction opposite to the back pressure;
Further, the pilot valve is disposed outside the back pressure chamber, and the opening of the pilot passage is controlled outside the back pressure chamber.   4. The hot and cold water mixing valve according to claim 1, wherein the throttle portion is constituted by a protruding portion provided in the drive valve in a state of protruding into the water inflow passage or the hot water inflow passage.   5. The temperature sensing device according to claim 1, wherein the hot water / water mixing valve extends in the axial direction in response to an increase in the temperature of the mixed water, and increases a biasing force to the pilot valve in a direction to open the water side main valve. A hot and cold water mixing valve having an automatic temperature control function, wherein a body is provided in a mixing chamber, and a bias spring is provided to urge the pilot valve in a direction in which the water side main valve is closed.

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