TWI814879B - Hot and cold water mixing valve - Google Patents

Abstract

The present invention provides a hot and cold water mixing valve that can reduce the number of O-rings and suppress damage to the O-rings. The mixing valve mechanism of the hot and cold water mixing valve at least includes: a housing 22 made of resin; a hot water inlet A is formed at the front end of the housing 22 and is connected to the hot water supply port; a hot water valve seat 22d is provided on The hot water inlet A and the cold water inlet B of the casing 22 are formed in the casing 4 and allow cold water to flow in; the cold water valve seat 4d is provided at the cold water inlet B of the casing 22; the control valve body 25 made of resin is It has a valve body 25a that is in contact with the hot water valve seat 22d and the cold water valve seat 4d and adjusts the opening degree of the hot water inlet A and the cold water inlet B; an O-ring 24 is provided at the hot water inlet A and the cold water inlet. B and separates the hot water inlet A and the cold water inlet B, and is in contact with the valve body 25a of the control valve body 25; and the actuator 28 has one end in contact with the partition wall 4b and the other end with the control valve body 25 phase contacts configured.

Description

Hot and cold water mixing valve

The present invention relates to a hot and cold water mixing valve, and in particular to a hot and cold water mixing valve having a housing made of resin.

In the past, hot and cold water mixing valve systems have been widely used in showers, bathtubs, sanitary equipment for washbasins, etc., to mix hot water and cold water to generate a mixture with a predetermined temperature set by the user. Hot and cold water.

As a general hot and cold water mixing valve, for example, a hot and cold water mixing valve device including a thermostat cartridge and a casing for accommodating the thermostat cartridge as shown in Japanese Patent No. 2827806 is known.

A hot and cold water mixing mechanism that adjusts the mixing ratio of hot and cold water to change the temperature of the mixed hot and cold water is provided inside the casing of the thermostat valve core.

Furthermore, the housing housing the thermostat valve element is composed of a double-layered housing of an inner housing made of resin and an outer housing made of resin. Then, between the inner shell made of resin and the outer shell made of resin, a hot water side passage and a cold water side passage are provided from the hot water side and cold water side supply pipes to the hot and cold water mixing mechanism of the thermostat valve core. In addition, a mixed hot and cold water passage from the hot and cold water mixing mechanism to the water spout is provided.

Furthermore, a hot water side passage and a mixed hot and cold water passage are provided between the outer circumferential surface of the thermostat valve element and the inner circumferential surface of the inner housing that accommodates the thermostat valve element. Then, a first O-ring is provided between the hot water side passage and the mixed hot and cold water passage to separate the hot water side passage and the mixed hot and cold water passage, so as to prevent the hot water from the hot water side passage and the mixed hot and cold water passage from being mixed with each other. Mix hot and cold water.

Similarly, a second O-ring is provided between the hot water side passage and the cold water side passage to prevent hot water and cold water from mixing.

Furthermore, in order to make the inside of the inner housing airtight, a third O-ring is provided between the outer peripheral surface of the thermostat valve core and the inner peripheral surface of the inner housing that can accommodate the thermostat valve core.

Then, hot water and cold water are supplied from the hot water side passage and the cold water side passage of the housing to the hot and cold water mixing mechanism of the thermostat valve core without mixing the hot water and cold water. Then, the mixed hot and cold water mixed at a predetermined temperature by the hot and cold water mixing mechanism is configured to pass through the mixed hot and cold water passage of the casing and be discharged from the water discharge port.

As mentioned above, in order to prevent hot water, cold water, mixed hot and cold water from mixing, and to make the inside of the housing housing the thermostat valve core airtight, the outer circumferential surface of the thermostat valve core is connected to the housing that can accommodate the thermostat valve core. At least three O-rings (first O-ring to third O-ring) are required between the inner circumferential surfaces of the inner shell.

Furthermore, when assembling the hot and cold water mixing valve, since the first to third O-rings move while rubbing against each other against the inner circumferential surface of the inner housing, the longer the moving distance (the friction distance) The longer the O-ring is, the more likely it is to be damaged. That is, the O-ring located on the innermost side of the shell is more likely to be damaged.

A hot and cold water mixing valve device that solves this problem has been proposed in Japanese Patent Application Publication No. 2017-67191. The hot and cold water mixing valve device described in Japanese Patent Application Publication No. 2017-67191 has a thermostat valve core housed in the casing. Furthermore, the housing system of the thermostat valve core is provided with first to third flanges that partition the space between the housing and the inner surface of the housing. O-rings are provided on outer peripheral surfaces of the first flange to the third flange.

The diameter of the first flange is larger than the diameter of the second flange and the diameter of the third flange, and the diameter of the second flange and the diameter of the third flange are formed to be the same.

On the other hand, the inner surface of the housing has an inner diameter facing the first flange and an inner diameter facing the second flange and the third flange.

The inner diameter opposite the first flange is formed to a first diameter larger than the diameter of the first flange. Furthermore, the inner diameter facing the second flange and the third flange is formed to be less than the first diameter and to be a second diameter larger than the diameter of the second flange and the diameter of the third flange. .

Then, a first inner surface having a first diameter and a second inner surface having a second diameter are formed on the inner surface of the housing in order from the side where the thermostat valve core is inserted into the housing.

In the hot and cold water mixing valve device of Japanese Patent Application Laid-Open No. 2017-67191 having the above structure, when the thermostat valve core is housed in the casing, the second flange and the third flange are formed to have small diameters, so that they do not interfere with each other. It rubs against the first inner surface (first diameter) of the casing and prevents damage to the O-ring.

As mentioned above, in the hot and cold water mixing valve device of Japanese Patent Application Publication No. 2017-67191, the diameter of the second flange of the thermostat valve core and the diameter of the third flange are formed to be the same diameter. Furthermore, it is configured so that the inner diameter of the housing facing the second flange and the third flange becomes less than the first diameter and becomes a second diameter larger than the diameter of the second flange and the diameter of the third flange. .

Therefore, when the thermostat valve core is stored in the housing, the O-ring disposed on the third flange on the innermost side of the housing will move while rubbing against the second inner surface (second diameter) of the housing. , and there is a risk of damage.

In addition, in order to prevent hot water, cold water, and mixed hot and cold water from mixing and to make the inside of the housing housing the thermostat valve core airtight, the outer peripheral surface of the thermostat valve core is connected to the inner housing that can accommodate the thermostat valve core. At least three O-rings are required between the inner circumferential surfaces.

Therefore, it is impossible to meet social needs for reducing the number of parts and reducing costs.

In order to solve the above-mentioned problems, the present inventors conducted intensive research on the premise of suppressing damage to the O-ring and reducing the number of O-rings. Then, the inventors reexamined the structure of the thermostat valve core and the housing by changing the material of the housing to resin and forming a part of the thermostat valve core on the housing side. As a result, it was found that the above-mentioned problems can be solved and the present invention was conceived.

The present invention was completed under the above circumstances, and an object of the present invention is to provide a hot and cold water mixing valve that can reduce the number of O-rings and suppress damage to the O-rings.

The hot and cold water mixing valve of the present invention to solve the above problems is provided with at least a cylindrical casing made of resin and a mixing valve mechanism accommodated in the casing. The cylindrical casing made of resin has a hot water supply port, a cold water supply port, a plurality of discharge ports, a mixing chamber, a switching chamber, a partition wall, and a communication hole. The mixing chamber mixes the hot water supplied from the hot water supply port and the cold water supplied from the cold water supply port, The switching chamber switches a plurality of discharge ports, the partition wall separates the mixing chamber and the switching chamber, the communication hole is formed on the partition wall and communicates the mixing chamber and the switching chamber; the mixing valve mechanism is at least It is equipped with: a resin casing that rotatably supports a rotating shaft for temperature adjustment; a hot water inflow port formed at the front end of the casing and connected to the hot water supply port; and a hot water valve seat. The hot water inlet is provided on the housing; the cold water inlet is parallel to the hot water inlet in the axial direction and is formed on the outer casing for cold water to flow in; the cold water valve seat is provided on the cold water inlet of the outer casing; The control valve body made of resin has a valve body in contact with the hot water valve seat and the cold water valve seat, and adjusts the opening degree of the hot water inlet and the cold water inlet; an O-ring is provided on the between the hot water inlet and the aforementioned cold water inlet and separate the aforementioned hot water inlet and the aforementioned cold water inlet, and in contact with the aforementioned control valve body and the aforementioned valve body; and an actuator, one end of which is in contact with the partition wall and the other end of which is in contact with the control valve body, and is arranged in the mixing chamber.

In this way, the hot and cold water mixing valve of the present invention has a mixing chamber and a partition wall formed in the casing. The mixing chamber mixes the hot water supplied from the hot water supply port and the cold water supplied from the cold water supply port. The partition wall The system separates the aforementioned mixing chamber and switching chamber. Furthermore, the partition wall is formed with a communication hole that communicates the mixing chamber and the switching chamber, and the casing is further provided with a cold water valve seat for the cold water inlet.

Therefore, the mixed hot and cold water from the mixing chamber and the cold water from the cold water inlet are not mixed and there is no need to provide an O-ring as is conventionally done.

That is, in the hot and cold water mixing valve of the present invention, the mixing of hot water, cold water, and mixed hot and cold water can be prevented by providing an O-ring, which is provided at the hot water inlet and the cold water inlet. It separates the hot water inlet and the cold water inlet, and is in contact with the valve body of the control valve body.

Here, it is preferable to form an inner peripheral surface of the housing with a minimum diameter between the hot water valve seat and the cold water inlet from the end of the housing inserted into the housing to the cold water inlet; The aforementioned O-ring is arranged on the step portion of the inner peripheral surface of the housing.

In this way, when viewed from the end of the housing inserted into the housing, the O-ring is disposed on the step portion formed on the inner circumferential surface of the housing with the smallest diameter between the hot water valve seat and the cold water inlet. Therefore, even if the O-ring is accommodated from the end side of the housing inserted into the housing, the O-ring will not rub against the inner peripheral surface of the housing, and damage to the O-ring can be suppressed.

Furthermore, a hot water inflow path communicating with the hot water supply port and the hot water inlet is formed between the inner peripheral surface of the outer casing and the outer peripheral surface of the casing. Furthermore, the front end of the casing is formed to have a larger diameter than the outer diameter of the casing in which the hot water inlet is formed; the aforementioned O The ring is arranged between the step portion provided on the housing and the front end of the housing. Thereby, it is preferable to separate the hot water inlet and the cold water inlet.

Since it is configured in this manner, the casing can be housed in the casing, thereby forming a hot water inflow path that communicates with the hot water supply port and the hot water inlet; and the aforementioned O-ring is pressed against the casing. The step portion is provided so that the hot water inlet and the cold water inlet are separated to prevent the mixing of hot water and cold water.

Furthermore, it is preferable that the outer shell, the casing, and the control valve system are made of the same resin. When the outer casing, the casing, and the control valve system are made of the same resin, wear of the valve and the valve seat can be suppressed.

As described above, according to the present invention, it is possible to obtain a hot and cold water mixing valve that can reduce the number of O-rings and suppress damage to the O-rings.

1: Hot and cold water mixing valve

2: Mixing valve mechanism

3: spit out switching mechanism

4: Shell

4a, 21a, 22b: Threaded part

4b:Partition wall

4c: Connecting hole

4d:Cold water valve seat

4e: Shaft guide hole

4f: step difference part

5: Hot water supply port

6:Cold water supply port

7:The first spit

8:Second spit

21, 31: Rotation axis

22: Shell

22a, 33: Cover

22c: Front end of housing

22d: Hot water valve seat

23, 24: O-ring

25:Control valve body

25a: Valve body

25b: Elastic body containment department

25c: ribs

25d: bottom

25e: Shaft

25f: hot water valve

25g:Cold water valve

25h: connecting hole

25i: flow path

26:Adjust the screw shaft

26a: Threaded part

27:Elastic body

28: Actuator

29:Return spring

29a: Fixed components

32:Switching valve

A: Hot water inlet

B: Cold water inlet

C: Mixing chamber

D:Switching room

D1: O-ring outer diameter

D2: inner diameter of shell

D3: outer diameter of the front end of the shell

D4: outer diameter of shell

E: Hot water inflow path

FIG. 1 is a perspective view showing an embodiment of the hot and cold water mixing valve of the present invention.

Fig. 2 is a front view of the embodiment shown in Fig. 1;

Figure 3 is a cross-sectional view taken along line A-A of Figure 2 .

Figure 4 is a diagram showing the control valve body shown in Figure 3, in which (a) is a side view and (b) is a front view.

FIG. 5 is an enlarged view of the main parts of the hot water inlet and the cold water inlet shown in FIG. 3 .

FIG. 6 is a front view illustrating an example of assembly of the hot and cold water mixing valve of the present invention, and corresponds to FIG. 2 .

Fig. 7 is a cross-sectional view taken along line A-A in Fig. 6 .

FIG. 8 is a front view illustrating another example of assembly of the hot and cold water mixing valve of the present invention, and is a view corresponding to FIG. 2 .

Fig. 9 is a cross-sectional view taken along line A-A in Fig. 8 .

Hereinafter, a hot and cold water mixing valve according to an embodiment of the present invention will be described based on FIGS. 1 to 7 .

As shown in FIG. 1 , the hot and cold water mixing valve 1 is provided with a casing 4 that accommodates a mixing valve mechanism 2 for mixing hot and cold water and a discharge switching mechanism 3 . The housing 4 is formed in a substantially cylindrical shape. The mixing valve mechanism 2 for mixing hot and cold water is housed on one end side of the housing 4 , and the hot and cold water switching mechanism 3 is housed on the other end side of the housing 4 .

Furthermore, the casing 4 is provided with: a hot water supply port 5 to which a hot water supply pipe for supplying hot water can be connected; a cold water supply port 6 to which a cold water supply pipe for supplying cold water can be connected; and a first discharge port 7 for discharging. The pipe (not shown) supplies mixed hot and cold water; and the second outlet 8 is for installing a shower hose, etc., and supplies mixed hot and cold water to the shower.

The hot water supply port 5 and the cold water supply port 6 are provided on the back surface side of the generally cylindrical housing 4, the first outlet 7 is provided on the lower surface side of the generally cylindrical housing 4, and the second outlet 8 It is provided on the upper surface side of the housing 4.

The casing 4 is made of resin; as the resin, for example, heat-resistant resin such as PPS (polyphenylenesulfide; polyphenylene sulfide) resin, PSF (polysulphone; polystyrene) resin, etc. can be used; it has a hot water supply port 5, a cold water supply port 6, The housing 4 of the first discharge port 7 and the second discharge port 8 is formed by a molding method.

Although not shown in FIGS. 1 to 7 , a temperature adjustment dial (lever) for rotating the rotating shaft 21 is provided outside the rotating shaft 21 for operating the mixing valve mechanism 2 . (lever)). Similarly, a switching dial (lever) for rotating the rotating shaft 31 is provided outside the rotating shaft 31 for operating the discharge switching mechanism 3 .

Furthermore, as shown in FIG. 3 , the discharge switching mechanism 3 is provided with: a switching valve 32 that switches the first discharge port and the second discharge port by the rotation of the rotating shaft 31 ; and a lid 33 that is sealed. The receiving end of the discharge switching mechanism of the housing 4. Since the discharge switching mechanism 3 has the same structure as a generally known one, detailed description thereof will be omitted.

Next, the mixing valve mechanism 2 will be described based on FIGS. 3 to 5 .

As shown in FIG. 3 , the mixing valve mechanism 2 has a housing 22 that rotatably supports a rotating shaft 21 . The housing 22 is made of resin. As the resin, for example, heat-resistant resin such as PPS (polyphenylene sulfide) resin, PSF (polystyrene) resin, etc. can be used, and is formed by a molding method.

As shown in Figures 3, 6, and 7, the overall shape of the housing 22 is formed into a bottomed cylindrical shape, and a cylindrical wall at the front end of the housing 22 is formed to communicate with the hot water supply port 5 and provide heat. The water flows into the hot water inlet A inside the casing 22 . Furthermore, the hot water supply port 5 and the hot water inlet A are connected by a hot water inflow path E formed by the inner peripheral surface of the casing 4 and the outer peripheral surface of the casing 22 .

In addition, as shown in FIG. 7 , the outer diameter D3 of the front end 22 c of the housing 22 is formed larger than the outer diameter D4 of the housing 22 in which the hot water inlet A is formed, and the O-ring 24 is disposed on the housing 4 . It is provided between the step part 4f and the front end 22c of the housing 22 (refer to FIG. 5).

In addition, an O-ring 23 for maintaining airtightness between the housing 22 and the outer shell 4 is provided on the outer peripheral surface of the housing 22 .

Furthermore, a cover 22 a is formed on the outer circumferential surface of the housing 22 , and a threaded portion 22 b is formed on the outer circumferential surface of the cover 22 a so as to be threadedly engaged with the threaded portion 4 a of the housing 4 .

Therefore, in a state where the housing 22 (mixing valve mechanism 2) is housed in the housing 4, the inside of the housing 4 is sealed and leakage of hot and cold water can be prevented.

The cold water inlet B for allowing cold water to flow in is provided in parallel with the hot water inlet A at the front end of the housing 22 in the axial direction. The cold water inlet B is formed in the housing 4 and can be separated from the hot water inlet A and the cold water inlet B by the O-ring 24 and the front end 22 c of the housing 22 to prevent the hot water from mixing with the cold water.

Furthermore, the O-ring 24 is in contact with the valve body 25a of the control valve body described later, and when the valve body 25a has moved, it will also separate the hot water inlet A and the cold water inlet B to prevent the hot water and cold water from flowing. Blended.

In addition, a mixing chamber C is formed from the inside of the hot water inlet A and the cold water inlet B of the casing 22 toward the switching chamber D of the housing 4 (right side in FIG. 3 ).

In addition, the casing 4 is provided with a partition wall 4 b, and the partition wall 4 b separates the mixing chamber C and the switching chamber D capable of accommodating the discharge switching mechanism 3 .

The partition wall 4b is formed with a communication hole for discharging the mixed hot and cold water to the switching chamber D, and is configured so that the hot water flowing in from the hot water inlet A and the cold water flowing in from the cold water inlet B are separated. It flows to the mixing chamber C, and after mixing cold water and hot water in the mixing chamber C, the mixed cold and hot water is supplied to the switching chamber D from the communication hole.

5, a hot water valve seat 22d is formed on the left side of the hot water inlet A of the housing 22, and a cold water valve seat 4d is formed on the right side of the cold water inlet B of the housing 4.

Then, a control valve body 25 movable in the axial direction of the housing 4 is embedded between the hot water valve seat 22d and the cold water valve seat 4d.

That is, the hot water inlet A and the cold water inlet B can be controlled by the control valve body 25 which is in contact with the hot water valve seat 22d and the cold water valve seat 4d and has the hot water valve 25f and the cold water valve 25g (valve body 25a). Adjust the opening degree and adjust the supply of hot water and cold water to the mixing chamber C.

In addition, the mixing valve mechanism 2 is equipped with an adjusting screw shaft 26; the adjusting screw shaft 26 is threaded with the rotating shaft 21 and moves forward and backward corresponding to the rotation of the rotating shaft 21, so as to adjust the position of the control valve body 25 in the axial direction. .

The adjusting screw shaft 26 does not rotate toward the housing 22 but is configured to move toward the axis of the housing 22 . In addition, a threaded portion 26a is formed on the adjustment screw shaft 26 and is threadedly engaged with the threaded portion 21a of the rotating shaft 21.

As a result, by rotating the temperature adjustment dial, the threaded portion 21 a of the rotating shaft 21 rotates and the adjustment screw shaft 26 slides in the axial direction, and the control valve body 25 moves through the urging body 27 .

That is, the user can set or change the position of the control valve body 25 by operating the temperature adjustment dial so as to spit out mixed water at a desired temperature.

Furthermore, in FIG. 3 , reference numeral 29 is a return spring of the adjustment screw shaft 26 . One end of the return spring 29 is locked to the fixed member 29 a and the other end is locked to the adjustment screw shaft 26 . The return spring 29 allows the adjustment screw shaft 26 to move in the axial direction without shaking.

As shown in Fig. 4, the control valve body 25 is provided with: a valve body 25a, which is formed in a cylindrical shape; a resilient body receiving portion 25b, which is provided inside the valve body 25a and is formed in a bottomed cylindrical shape; ribs (rib) 25c is extended in the axial direction in order to connect the valve body 25a and the elastic body receiving portion 25b; and the shaft portion 25e is extended in the axial direction from the bottom 25d of the elastic body receiving portion 25b toward the outside.

As shown in FIG. 3 , the shaft portion 25e is slidably inserted into the shaft guide hole 4e formed in the partition wall 4b of the housing 4 and is configured to guide the movement of the control valve body 25 .

Moreover, the communication hole 25h which guides the hot water which has entered the inside of the elastic body accommodating part 25b to the mixing chamber C is formed in the bottom part 25d. Furthermore, a flow path 25i for guiding hot water into the mixing chamber C is formed between the inner peripheral surface of the valve body 25a and the outer peripheral surface of the elastic body housing portion 25b (between the ribs 25c).

Furthermore, the control valve body 25 is formed of a heat-resistant material such as PPS (polyphenylene sulfide) resin, PSF (polyphenylene sulfide) resin, etc., by a molding method.

In addition, the valve body 25a has a hot water valve 25f formed on one end edge of the cylinder wall of the valve body 25a (the upper edge of (b) in Figure 4), and a hot water valve 25f is formed on the other end edge of the cylinder wall of the valve body 25a ( A cold water valve 25g is formed on the lower edge of Figure 4.

By connecting (contacting) the hot water valve 25f of the control valve body 25 with the hot water valve seat 22d of the housing 22, the supply of hot water can be cut off. Furthermore, the supply of cold water can be cut off by the cold water valve 25g of the control valve body 25 coming into contact with the cold water valve seat 4d of the housing 4.

In this way, although the hot water valve 25f of the control valve body 25 will be in contact with the hot water valve seat 22d of the housing 22 and the cold water valve 25g of the control valve body 25 will be in contact with the cold water valve seat 4d of the housing 4, due to the control valve The body 25, the housing 22, and the outer shell 4 are made of resin, so wear of the valve and the valve seat can be suppressed. Preferably, the control valve body 25, the housing 22, and the outer shell 4 are made of the same resin.

In addition, as shown in Figures 3 and 5, the control valve body 25 is in contact with and supported by an O-ring 24 provided between the hot water inlet A and the cold water inlet B. .

That is, the outer peripheral surface of the valve body 25a is supported by contacting an O-ring 24 to form an airtight seal between the hot water valve 25f and the cold water valve 25g, and the valve body 25a is configured to be slidable in the axial direction. Then, by sliding the valve body 25a in the axial direction, as mentioned above, the amount of hot water can be adjusted by the opening degree of the hot water valve 25f and the hot water valve seat 22d, and the amount of hot water can be adjusted by the cold water valve 25g and the cold water valve seat. 4d opening degree to adjust the amount of cold water.

In addition, as shown in Figures 3 and 5, the O-ring 24 is press-fitted to the step portion 4f provided on the housing 4 through the front end 22c of the housing 22, thereby separating the hot water inlet A and the cold water. Inlet B and prevent hot water and cold water from leaking between hot water inlet A and cold water inlet B.

Here, in the inner circumferential surface of the casing from the end of the casing into which the casing 22 is inserted to the cold water inlet B, an inner circumferential surface of the casing with the smallest diameter is formed between the hot water inlet A and the cold water inlet B. . Then, a step portion 4f is formed on the inner peripheral surface of the housing having the smallest diameter.

That is, the step portion 4f is formed on the inner peripheral surface of the housing 4 with the smallest diameter from the end of the housing 4 inserted into the housing 22 to the cold water inlet B.

Therefore, when the O-ring 24 is disposed in the step portion 4f provided on the housing 4, it will not rub against the inner circumferential surface of the housing 4, thereby preventing the O-ring 24 from being damaged.

As the material of the O-ring 24, EPDM (ethylene-propylene-diene rubber), hexafluoropropylene-vinylidene fluoride copolymer (FKM), or fluoride copolymer (FKM) can be used. Butyl rubber.

Because the hexafluoropropylene-vinylidene fluoride copolymer (FKM) has the properties of heat resistance, low impact resilience and excellent impact absorption; butyl rubber is also used with hexafluoropropylene-vinylidene fluoride copolymer. (FKM) also has the properties of heat resistance, low impact resilience, and excellent impact absorption, so it is preferred.

Furthermore, the biasing body 27 is accommodated inside the biasing body receiving portion 25b of the control valve body 25, and one end of the biasing body 27 is disposed in contact with the inner surface of the bottom 25d of the biasing body housing portion 25b.

Thereby, the control valve body 25 can slide to the side of the cold water valve seat 4d by withstanding the rebound force of the elastic body 27.

Furthermore, one end of the actuator 28 is arranged in contact with the outer surface of the bottom 25d of the elastic body housing portion 25b. Thereby, the control valve body 25 can slide to the side of the hot water valve seat 22d with the rebound force of the actuator 28.

In addition, the urging body 27 is formed of a material with a fixed spring constant. An example of the urging body 27 is a coil spring made of stainless steel, but the specific structure is not particularly limited.

In addition, the actuator 28 performs expansion and contraction operation in accordance with temperature changes. Examples of the actuator 28 include a shape memory alloy spring (SMA (shape memory alloy) spring) or a paraffin wax element (wax element) made of a material whose spring constant changes with temperature. The specific composition is not particularly limited.

As shown in FIG. 3 , the actuator 28 is supported in contact with the partition wall 4 b formed inside the housing 4 and the outer surface of the bottom of the control valve body 25 .

Then, the control valve body 25 adjusts the distance between the hot water valve 25f and the hot water valve seat 22d and the cold water valve 25g and the cold water valve seat 4d by balancing the load received from the spring pressure body 27 and the actuator 28. interval.

With this configuration, the hot and cold water mixing valve 1 can adjust the mixing ratio of the hot water flowing in from the hot water inlet A and the cold water flowing in from the cold water inlet B.

Next, an example of assembling the hot and cold water mixing valve will be described based on FIGS. 6 and 7 .

The actuator 28 is accommodated in the mixing chamber C of the housing 4 and is disposed so that one end thereof is in contact with the partition wall 4b.

Next, the O-ring 24 is installed on the outer circumferential surface of the valve body 25a in advance, and the control valve body 25 with the elastic body 27 accommodated in the elastic body receiving portion 25b is accommodated in the mixing chamber C of the housing 4.

At this time, the shaft portion 25e of the control valve body 25 is inserted into the shaft guide hole 4e of the partition wall 4b, and the other end of the actuator 28 is placed in contact with the outer surface of the bottom 25d of the control valve body 25.

In addition, since the outer diameter D1 of the O-ring 24 is formed smaller than the inner diameter D2 of the housing excluding the stepped portion 4f (excluding the stepped portion 4f), the O-ring 24 does not move when the control valve body 25 is accommodated. It moves with friction with the inner peripheral surface of the housing 4 and can be locked at the step portion 4f.

Furthermore, since the outer diameter D3 of the front end 22c of the housing is also formed smaller than the inner diameter D2 of the housing (excluding the stepped portion 4f), the housing 22 will not rub against the inner peripheral surface of the housing 4 when the housing 22 is accommodated. to move and press the O-ring 24.

Then, the housing 22 in which the adjustment screw shaft 26, the rotation shaft 21, etc. are embedded is accommodated inside the housing 4.

At this time, the front end 22c of the housing 22 is in contact with the O-ring 24 and separates the hot water inlet A and the cold water inlet B to prevent the hot water from mixing with the cold water.

In addition, since the outer diameter D4 of the casing 22 is smaller than the inner diameter D2 of the casing 4, a hot water inflow path can be formed between the casing 4 and the casing 22 by housing the casing 22 in the casing 4. E.

Furthermore, the O-ring 23 provided on the outer peripheral surface of the casing 22 can make the connection between the casing 4 and the casing 22 airtight and prevent the leakage of hot water and cold water.

Furthermore, the casing 22 can be fixed to the casing 4 by screwing the cover 22a to the casing 4 and can prevent falling off.

Next, another example of assembling the hot and cold water mixing valve will be described based on FIGS. 8 and 9 .

The assembly example of the hot and cold water mixing valve is to prepare in advance a housing 22 embedded with an adjusting screw shaft 26, a rotating shaft 21, a spring body 27, a control valve body 25, an actuator 28, an O-ring 24, and the like.

Then, the housing 22 is accommodated in the mixing chamber C of the housing 4, and the shaft portion 25e of the control valve body 25 is inserted into the shaft guide hole 4e of the partition wall 4b, and one end of the actuator 28 is connected to the partition wall along the shaft portion 25e. It is arranged so that the partition wall 4b is in contact (the other end of the actuator 28 is in contact with the outer surface of the bottom 25d of the control valve body 25).

When the control valve body 25 is accommodated, the O-ring 24 does not move due to friction with the inner peripheral surface of the housing 4 and can be locked at the step portion 4f. Thereby, the front end 22c of the housing 22 is in contact with the O-ring 24 and separates the hot water inlet A and the cold water inlet B to prevent the hot water from mixing with the cold water.

In addition, the hot water inflow path E is formed by housing the casing 22 in the outer casing 4 . Furthermore, the O-ring 23 provided on the outer peripheral surface of the housing 22 can make the connection between the housing 4 and the housing 22 airtight and prevent the leakage of hot water and cold water.

Furthermore, the casing 22 is fixed to the casing 4 by the cover 22a being screwed to the casing 4 and prevented from falling off.

In the hot and cold water mixing valve assembled in this way, the depressing amount of the depressing body 27 is adjusted by a temperature adjustment handle (not shown), whereby after the hot water outlet temperature is set, it is the same as the conventional one. The hot and cold water mixing valve can also use the actuator 28 and the elastic body 27 to adjust the opening degree of the hot water inlet and the cold water inlet by controlling the valve body and adjust the hot water outlet temperature.

As mentioned above, the hot and cold water mixing valve of the present invention does not need to be provided with an O-ring to prevent the mixed hot and cold water from the mixing chamber and the cold water from the cold water inlet. When using an O-ring, the O-ring will not rub against the inner circumferential surface of the housing, thus preventing damage to the O-ring.

In addition, by housing the casing in the casing, a hot water inflow path can be formed that is connected to the hot water supply port and the hot water inlet. In addition, the O-ring is pressed against the step portion provided in the casing, and the hot water inflow path can be divided into two parts. Insulate the water inlet and cold water inlet and prevent the mixing of hot and cold water.

Furthermore, when the shell, case, and control valve system are made of the same resin, wear of the valve and valve seat can be suppressed.

1: Hot and cold water mixing valve

2: Mixing valve mechanism

3: spit out switching mechanism

4: Shell

5: Hot water supply port

6:Cold water supply port

7:The first spit

8:Second spit

21, 31: Rotation axis

Claims (4)

A hot and cold water mixing valve is provided with at least a cylindrical casing made of resin and a mixing valve mechanism accommodated in the casing. The cylindrical casing made of resin has a hot water supply port, a cold water supply port, and a plurality of spouts. An outlet, a mixing chamber, a switching chamber, a partition wall and a communication hole. The mixing chamber mixes the hot water supplied from the hot water supply port and the cold water supplied from the cold water supply port. The switching chamber performs a plurality of For switching of the discharge port, the partition wall separates the mixing chamber and the switching chamber, and the communication hole is formed on the partition wall and communicates the mixing chamber and the switching chamber; The aforementioned mixing valve mechanism system at least has: The resin casing supports the rotating shaft for temperature adjustment so as to be able to rotate; The hot water inlet is formed at the front end of the housing and is connected to the hot water supply port; The hot water valve seat is provided at the hot water inlet of the aforementioned housing; The cold water inlet is parallel to the aforementioned hot water inlet in the axial direction and is formed on the outer casing for cold water to flow in; The cold water valve seat is provided at the cold water inlet of the aforementioned shell; The control valve body made of resin has a valve body in contact with the hot water valve seat and the cold water valve seat, and adjusts the opening degree of the hot water inlet and the cold water inlet; An O-ring is disposed between the hot water inlet and the cold water inlet and separates the hot water inlet and the cold water inlet, and is in contact with the control valve body and the valve body; and The actuator is disposed with one end in contact with the partition wall and the other end in contact with the control valve body, and is disposed in the mixing chamber. The hot and cold water mixing valve according to claim 1, wherein from the end of the housing inserted into the housing to the cold water inlet, the inner peripheral surface of the housing with the smallest diameter is formed between the hot water valve seat and the cold water inlet. between; The O-ring is disposed at a stepped portion formed on the inner peripheral surface of the housing with the smallest diameter. The hot and cold water mixing valve according to claim 2, wherein a hot water inflow path connected to the hot water supply port and the hot water inlet is formed between the inner peripheral surface of the outer casing and the outer peripheral surface of the casing; The front end of the housing is formed to have a larger diameter than the outer diameter of the housing in which the hot water inlet is formed; The O-ring is disposed between the step portion provided on the housing and the front end of the housing, thereby separating the hot water inlet and the cold water inlet. The hot and cold water mixing valve according to any one of claims 1 to 3, wherein the outer casing, the housing, and the control valve system are made of the same resin.

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