KR102590714B1 - Hot and cold water mixing faucet - Google Patents

Abstract

The purpose of the present invention is to provide a hot/cold water mixing faucet that can suppress cracking without reducing hot water temperature control performance. A cylindrical casing (1) having a hot water inlet (A), a cold water inlet (B), a mixing chamber (C) for mixing hot and cold water, and a mixing water outlet (D) for discharging the mixed water, and a casing (1) accommodated in the casing. It has at least an actuator (4) and a control valve body (2) that adjusts the opening degrees of the hot water inlet and the cold water inlet, and when the actuator expands and contracts, the control valve body advances and retreats in the direction of the axis of the casing, so that the mixed water of hot and cold water In the hot/cold water mixing faucet in which the ratio of hot water and cold water is adjusted so that the temperature is at a set temperature, between the casing (1) and the control valve body (2) and the hot water inlet (A) and the cold water inlet (B) It has an O-ring 11 disposed therebetween, and the O-ring 10 is made of propylene hexafluoride-vinylidene fluoride copolymer (FKM) or butyl rubber.

Description

Hot and cold water mixing faucet{HOT AND COLD WATER MIXING FAUCET}

The present invention relates to a hot/cold water mixing faucet, and particularly to a hot/cold water mixing faucet that suppresses the generation of strange noises.

Conventionally, hot/cold water mixing faucets mix hot water and cold water to produce mixed water at a predetermined temperature set by the user, and have been widely used in sanitary equipment for showers, bathtubs, and washbasins.

Generally, a hot/cold water mixing faucet includes a casing having a mixing chamber for mixing hot water and cold water, a hot water inlet and a cold water inlet installed in the casing, an opening degree of the hot water inlet accommodated in the casing, It is provided with a control valve element that adjusts the opening degree of the cold water inlet.

In addition, inside the mixing chamber, a temperature-sensitive spring (actuator) made of a shape memory alloy is installed, and this temperature-sensitive spring biases the control valve body in the direction of narrowing the opening degree of the hot water inlet and widening the opening degree of the cold water inlet. I am ordering it.

Furthermore, a bias spring (deflector) is accommodated inside the casing, and biases the control valve body in a direction opposite to that of the thermostatic spring.

In addition, when the temperature of the mixed water of hot and cold water flowing in from the hot water inlet and the cold water inlet is higher than the set temperature, the temperature sensing spring (actuator) made of shape memory alloy deforms, the spring force increases, and the control valve element Moving in the direction of the hot water inlet, the opening degree of the hot water inlet is narrowed, while the opening degree of the cold water inlet is widened.

Accordingly, the inflow of hot water decreases, while the inflow of cold water increases, lowering the mixed water temperature. And finally, when the mixed water temperature reaches the set temperature, the control valve body is balanced and stops at that position.

On the other hand, when the temperature of the mixed water of hot and cold water is lower than the set temperature, the temperature sensing spring made of shape memory alloy deforms in shape, the spring force decreases, and the control valve body moves toward the cold water inlet, causing the opening of the hot water inlet. widens, while narrowing the opening of the cold water inlet.

Accordingly, the inflow of hot water increases, while the inflow of cold water decreases, increasing the temperature of the mixed water. And finally, when the mixed water temperature reaches the set temperature, the control valve body is balanced and stops at that position.

However, in this hot/cold water mixed faucet, under high pressure conditions, when the opening degree of the hot water inlet is extremely narrow, the flow rate at the hot water inlet becomes extremely fast, causing the control valve that controls the flow rate to vibrate, causing abnormal noise. It is known to occur.

Several proposals are being made to solve this problem.

For example, Japanese Patent Laid-Open No. 2016-125663 discloses a thermostat cartridge that avoids pressure surges occurring in the water supply path.

Specifically, a thermostat cartridge is disclosed in which a regulator for adjusting the mixing ratio of hot water and cold water forms a water annular gap including an attenuation area together with a cartridge housing, and this water annular gap communicates with the water adjustment gap. there is.

In addition, in Japanese Utility Model Publication No. 6-010681 and Utility Model Registration No. 2558665, when the hot water pressure is high at 3 kg/cm2 or more, the valve body is shaken by the force of the flow of hot water, and the surrounding valve body is maintained. In order to suppress the occurrence of a “boo” or “beep” sound by colliding with the inner circumference of the valve or the return spring, (1) a plurality of O-rings installed on the valve body holding portion that holds the outer circumference of the valve body. The hardness is set to 85 to 95, (2) the diameter of both ends of the outer peripheral part of the valve body is made thinner than the diameter of the central part to ensure a gap between it and the inner periphery of the valve body holding part, and (3) the return spring of the cylindrical part of the valve body is secured. The diameter of the surrounding portion is made thinner than the diameter of the end cap insertion portion at the tip of the cylindrical portion, and (4) the radial movement of the spring is performed on the valve body and the end cap that support the end of the return spring that deflects the valve body in the axial direction. A valve support structure for a thermostat-type mixing valve provided with a seat that prevents is disclosed.

Additionally, in Japanese Patent Laid-Open No. 10-292872, if the collapse allowance of the O-ring that acts as a seal between the movable valve body and the housing is reduced and the friction force is reduced by changing the seal member, temperature reduction is achieved. It is disclosed that the followability of the movable valve body to the expansion and contraction of the spring (actuator) is increased, causing the movable valve body to vibrate at a high frequency and generate abnormal noise.

However, as described in Japanese Patent Laid-Open No. 2016-125663, by providing a male annular gap in communication with the water adjustment gap and providing an attenuation area in this water annular gap, the water adjustment gap becomes a resistance. , there was a problem that the flow rate decreased.

In addition, as described in Japanese Utility Model Publication No. 6-010681 and Utility Model Registration No. 2558665, holding the outer peripheral part of the valve body using a plurality of O-rings increases sliding resistance. For this reason, there was a problem that the sliding of the valve body was hindered and the temperature control performance was deteriorated.

Furthermore, in Japanese Patent Laid-Open No. 10-292872, as described above, in order to suppress the occurrence of noise, it is not desirable to reduce the frictional force by reducing the collapse margin of the O-ring and changing the seal member. What has not been done is disclosed. However, the problem of increasing the collapse margin of the O-ring and increasing the friction force is that the followability of the movable valve body (control valve body) to the expansion and contraction of the thermostatic spring (actuator) is low, which reduces temperature control performance. there was.

The present researchers conducted a thorough study on a hot/cold water mixing faucet that suppresses the generation of the above-mentioned noise without deteriorating temperature control performance. In this study, it was assumed that a water annular gap with an attenuation region, as described in Japanese Patent Application Laid-Open No. 2016-125663, was not provided. In addition, as described in Japanese Utility Model Publication No. 6-010681 and Japanese Utility Model Registration No. 2558665, maintaining the outer peripheral part of the valve body using a plurality of O-rings increases sliding resistance. For this reason (because friction increases), it was assumed that the outer peripheral part of the valve body was maintained using one O-ring. In addition, different from the description in Japanese Patent Application Laid-Open No. 10-292872, the collapse margin of the O-ring is reduced, and even in the case where the friction between the control valve element and the O-ring is small, the O-ring made of a specific material By supporting the control valve body with a ring, it was recognized and discovered that cracking could be suppressed without deteriorating temperature control performance, and the present invention was completed.

The present invention was made under the above circumstances, and its purpose is to provide a hot/cold water mixing faucet that can improve temperature control performance and suppress the generation of abnormal noise.

The hot/cold water mixing faucet according to the present invention for solving the above problems includes a cylindrical casing having a hot water inlet, a cold water inlet, a mixing chamber for mixing hot and cold water, and a mixed water outlet for discharging the mixed water; It has at least an actuator accommodated in the casing and a control valve element that adjusts the opening degrees of the hot water inlet and the cold water inlet, and the control valve element advances and retreats in the axis direction of the casing when the actuator expands and contracts, thereby adjusting the temperature of the mixed hot and cold water. A hot/cold water mixing faucet adjusted to a set temperature, comprising an O-ring disposed between the casing and the control valve body and between the hot water inlet and the cold water inlet, the O-ring comprising: It is characterized by being made of propylene hexafluoride-vinylidene fluoride copolymer (FKM), or butyl rubber.

In this way, since one O-ring is disposed between the casing and the control valve body and between the hot water inlet and the cold water inlet, the sliding resistance of the valve body is reduced compared to the case where multiple O-rings are disposed, and the actuator The control valve body has good followability to expansion and contraction, and temperature control performance can be improved.

In addition, propylene hexafluoride-vinylidene fluoride copolymer (FKM), or butyl rubber, is a material with low rebound elasticity, so it is excellent in shock absorption.

Therefore, the O-ring made of propylene hexafluoride-vinylidene fluoride copolymer (FKM) or the O-ring made of butyl rubber can absorb the vibration of the control valve body and further suppress the generation of abnormal noise. there is.

Furthermore, propylene hexafluoride-vinylidene fluoride copolymer (FKM) or butyl rubber, which are materials with low rebound elasticity, have a small rebound force, so the rebound force from the O-ring can be reduced, thereby reducing the sliding resistance of the control valve body. can be made smaller.

In this way, in the hot/cold water mixing faucet according to the present invention, the sliding resistance of the valve body is reduced and the control valve body has good followability to the expansion and contraction of the actuator, thereby improving temperature control performance and suppressing the generation of abnormal noise. can do.

Here, it is preferable that the collapse rate of the O-ring is 8.3% or less.

If the collapse rate of the O-ring is increased, the repulsive force from the O-ring increases and the sliding resistance of the control valve body increases, which is not desirable.

On the other hand, by reducing the collapse rate, the shock absorbency of the O-ring can be further demonstrated, the vibration of the control valve body can be more absorbed, and the generation of abnormal noise can be further suppressed.

Additionally, a collapse rate of 0% is a state in which the O-ring is not deformed and is undesirable from the viewpoint of sealability. Considering sealability, the most desirable collapse rate is around 3% to 8.3%.

In addition, the O-ring is preferably disposed in an area between the hot water inlet and the midpoint of the hot water inlet and the cold water inlet, and supports the O-ring closer to the tip of the control valve body (hot water valve). It is good that the ring is placed.

The tip of the control valve body (hot water valve) is the part that vibrates the most, and by supporting this part with an O-ring, the generation of abnormal noise can be further suppressed.

As described above, according to the present invention, it is possible to obtain a hot/cold water mixing faucet that can improve temperature control performance and suppress the generation of abnormal noise.

1 is a longitudinal cross-sectional view showing an embodiment according to the present invention.
Figure 2 is a top view of the control valve body.
FIG. 3 is a side view of the control valve body shown in FIG. 2.
Figure 4 is a sectional view II of the control valve body shown in Figure 2.
FIG. 5 is a II-II cross-sectional view of the control valve body shown in FIG. 2.
Figure 6 is an enlarged view of the main part of Figure 1.
Figure 7 is a diagram for explaining the collapse rate of the O-ring.
Figure 8 is a diagram showing the arrangement position of the O-ring in Comparative Example 1.

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 7. First, based on FIG. 1, the schematic structure of the hot/cold water mixing faucet will be described.

As shown in FIG. 1, the hot/cold water mixing faucet 1 is built into a cylindrical case (not shown) that serves as an external case, and is thus formed in a cartridge shape, as shown in FIG. 1.

The O-rings (11, 12, 13) installed on the outer peripheral surface of the hot/cold water mixing faucet (1) are used to maintain airtightness between the hot/cold water mixing faucet (1) and the case when built into the case. It is installed.

Additionally, for example, a discharge pipe, a shower hose, etc. are attached to the case, and are configured to discharge mixed hot/cold water at a set temperature, which is generated by the hot/cold water mixing faucet 1.

The hot/cold water mixing faucet (1) is assembled by housing a control valve mechanism including a control valve body (2) in a cylindrical casing (1).

This casing 1 has a cylindrical first body 1a and a second body 1b, and at one end of the first body 1a, a cylindrical first body 1a and a second body 1b are provided. By screwing the main body 1b (screwing portion 1c), the overall shape is formed into a cylindrical shape.

On the barrel wall of the casing (1), a hot water inlet (A) through which hot water flows and a cold water inlet (B) through which cold water flows are formed in parallel in the axial direction. In addition, from the inside of the hot water inlet A of the casing 1 toward one end (right side in FIG. 1) of the casing 1, there is a mixing chamber C communicating with the hot water inlet A and the cold water inlet B. ) is formed.

At the end of the mixing chamber (C), a mixed water outlet (D) is formed for discharging hot/cold water mixed water. The hot water flowing in from the hot water inlet (A) and the cold water flowing in from the cold water inlet (B) respectively flow into the mixing chamber (C), and the cold water and hot water are mixed in the mixing chamber (C), and the mixed water outlet ( D) is discharged from.

Additionally, in the first body 1a, a hot water valve seat 1d is formed at a position inside the hot water inlet A, and a cold water valve seat 1e is formed at a position inside the cold water inlet B.

And, between the hot water valve seat 1d and the cold water valve seat 1e formed in the casing 1, a control valve element 2 movable in the axial direction of the casing 1 is built. This control valve body 2 is formed in a cylindrical shape, and a hot water valve 2a is formed on one edge of the barrel wall (left edge in FIG. 1), and a cold water valve 2b is formed on the other end edge (right edge in FIG. 1). is formed

This control valve element 2 is supported by an O-ring 10 made of a specific material and installed between the hot water inlet A and the cold water inlet B. This O-ring 10 and the support structure of the O-ring 10 will be described in detail later.

Additionally, inside the casing 1, there is a deflection element 3 that biases the control valve body 2 toward the cold water valve seat 1e side, and an actuator that biases the control valve body 2 toward the hot water valve seat 1d side. (4) is built-in.

The deflector 3 is made of a material with a constant spring constant. Examples of this deflector 3 include a coil spring made of stainless steel, but there is no particular limitation on the specific structure.

Additionally, the actuator 4 expands and contracts according to temperature changes. Examples of this actuator 4 include shape memory alloy (SMA) springs or wax elements, which are formed of a material whose spring constant changes depending on temperature. There is no particular limitation.

As shown in FIG. 1, this actuator 4 includes a spring seat 7 formed inside the second main body 1b (inside the mixing chamber D) and the bottom of the control valve body 2. It is supported between the outer surfaces of the part 2D.

And, the control valve body 2 adjusts the gap between the hot water valve 2a and the hot water valve seat 1d and the cold water valve 2b by balancing the loads received from the deflector body 3 and the actuator 4. Adjust the gap between the cold water valve seats (1e). With this configuration, the hot/cold water mixing faucet 1 adjusts the mixing ratio of hot water flowing in from the hot water inlet A and water flowing in from the cold water inlet B.

Additionally, inside the casing 1, a rotational motion from a temperature control dial (handle 5) is received, and the axial load applied to the deflector 3 is changed according to the rotational motion, and the control valve Temperature control means (adjustment screw 5a, adjustment screw shaft 6) for adjusting the axial position of the sieve 2 are incorporated. That is, by rotating the handle 5 to which the temperature control dial is attached, the adjustment screw 5a rotates, causing the adjustment screw shaft 6 to slide in the axial direction, and through the deflection body 3, the control valve body ( 2) Move it.

Accordingly, by operating the temperature control dial, the user can set and change the position of the control valve body 2 so that mixed water at a desired temperature is discharged.

In FIG. 1 , reference numeral 8 denotes a return spring of the adjusting screw shaft 6, one end of which is hooked on the fixing member 9, and the other end of which is hooked on the adjusting screw shaft 6. This return spring 8 allows the adjusting screw shaft 6 to move in the axial direction without rattling.

Additionally, the control valve body 2, the O-ring 10, and the support structure of the O-ring 10 will be explained based on FIGS. 2 to 7.

As shown in FIGS. 2 to 5, the control valve body 2 includes a valve body 2A formed in a cylindrical shape, and a deflection body formed in a bottomed cylindrical shape provided inside the valve body 2A. In order to connect the accommodating part 2B, the valve body 2A and the deflecting body accommodating part 2B, a rib 2C extending in the axial direction, and a bottom part 2D of the deflecting body accommodating part 2B. A shaft portion 2E extending in the axial direction outward from is provided.

As shown in FIG. 1, this shaft portion 2E is slidably inserted into the shaft guide hole 1f formed in the first body portion 1a and is configured to guide the movement of the control valve body 2. do. Additionally, this control valve body 2 is formed by molding of heat-resistant, for example, PPS (polyphenylene sulfide) resin or PSF (polysulfone) resin.

As already explained, the valve body 2A has a hot water valve 2a formed on one edge of the barrel wall (upper edge in Figure 4) and a cold water valve 2b on the other edge (lower edge in Figure 4). is formed

As shown in FIGS. 1 and 6, the outer peripheral surface of the valve body 2A is supported by one O-ring 10, and provides an airtight seal between the hot water valve 2a and the cold water valve 2b. In addition, the valve body 2A is configured to be slidable in the axial direction.

The deflector 3 is accommodated inside the deflector accommodating portion 2B, and one end of the deflector 3 is caught on the inner surface of the bottom portion 2D of the deflector accommodating portion 2B. Accordingly, the control valve body 2 can be slid toward the cold water valve 2b by receiving the repulsive force of the deflection body 3.

Additionally, one end of the actuator 4 is caught on the outer surface of the bottom portion 2D of the deflector accommodating portion 2B. Accordingly, by receiving the repulsive force of the actuator 4, the control valve body 2 can be slid toward the hot water valve 2a.

Additionally, as shown in FIGS. 3, 5, and 6, a communication hole 2c is formed in the bottom-side barrel wall of the deflector accommodating portion 2B and the bottom portion 2D. This communication hole 2c guides hot water and cold water (mainly hot water) entering the inside of the deflector accommodating portion 2B to the mixing chamber C.

Additionally, the ribs 2C connecting the valve body 2A and the deflector accommodating portion 2B are provided at six points in the circumferential direction and extend in the axial direction.

Accordingly, the valve element 2A and the deflection element accommodating part 2B are connected, and a distribution path 2d is formed between the inner peripheral surface of the valve element 2A and the outer peripheral surface of the deflecting element accommodating part 2B. This distribution path 2d leads hot water and cold water (mainly hot water) to the mixing chamber C.

Next, the O-ring 10 will be described.

When the supply of hot water becomes high pressure, the force caused by the flow of hot water causes the valve element 2A to vibrate, resulting in abnormal noise. In order to suppress this joint, propylene hexafluoride-vinylidene fluoride copolymer (FKM) or butyl rubber is used as the material of the O-ring 10.

This propylene hexafluoride-vinylidene fluoride copolymer (FKM) has the properties of heat resistance, small rebound elasticity, and excellent shock absorption. In addition, butyl rubber, like propylene hexafluoride-vinylidene fluoride copolymer (FKM), has heat resistance, low rebound elasticity, and excellent shock absorption.

In particular, this propylene fluoride-vinylidene fluoride copolymer (FKM) and butyl rubber have low rebound elasticity, so when the collapse rate of the O-ring is the same, the rebound force can be reduced and the sliding resistance of the valve body can be reduced. there is.

EPDM (ethylene propylene diene rubber), which is a commonly used material for the O-ring supporting the valve body 2A, is not suitable because it has poor shock absorption and high rebound elasticity. For this reason, the rebound elastic modulus of general EPDM (ethylene propylene diene rubber) is about 61% and the hardness is about 70°, and the rebound elastic modulus of propylene fluoride-vinylidene fluoride copolymer (FKM) is about 14% and the hardness is about 70°. It is 70°.

Additionally, silicone rubber, like EPDM (ethylene propylene diene rubber), is not suitable because it has poor shock absorption and high rebound elasticity.

Moreover, when comparing butyl rubber and propylene fluoride-vinylidene fluoride copolymer (FKM), propylene fluoride-vinylidene fluoride copolymer (FKM) is more preferable from the viewpoints of chlorine resistance, heat resistance, and oil resistance.

Additionally, the O-ring 10 is disposed between the valve body 2A and the first body 1a so that the collapse rate is 8.3% or less.

By reducing the collapse rate of the O-ring 10 by using propylene hexafluoride-vinylidene fluoride copolymer (FKM) or butyl rubber, which has excellent shock absorption, the occurrence of noise can be suppressed and the valve body The sliding resistance can be reduced, the control valve body can follow the expansion and contraction of the actuator 4 well, and the temperature control performance can be improved.

Here, the collapse rate means X/Y x 100 when the diameter without load is

In addition, since the O-ring 10 has a small rebound elasticity, the smaller the collapse rate, the smaller the repulsive force, so the sliding resistance of the valve body 2A becomes small, and the control valve body 2 with respect to expansion and contraction of the actuator 4 With good followability, temperature control performance can be improved. Additionally, a collapse rate of 0% is a state in which the O-ring is not deformed and is undesirable from the viewpoint of sealability. Therefore, considering sealability, the most desirable collapse rate is about 3% to 8.3%.

Additionally, as shown in FIGS. 1 and 6, the control valve element 2 is supported by one of the O-rings 10. Specifically, the outer peripheral portion of the valve body 2A is held using one O-ring.

It is conceivable to support the control valve body 2 with a plurality of O-rings 10, but since there is a risk that the sliding resistance increases and the temperature control performance decreases, in the present invention, the valve body The outer periphery of (2A) is maintained using one O-ring.

In addition, as shown in FIG. 6, the O-ring is connected to the hot water inlet (A) from the midpoint (P) between the center (C1) of the hot water inlet (A) and the center (C2) of the cold water inlet (B). It is placed in the area (E) in between. That is, the O-ring 10 is installed on the inner peripheral surface of the first body 1a so as to support the side of the hot water valve 2a rather than the middle of the axial direction of the valve body 2A.

Preferably, as shown in Figure 6, the midpoint (P) between the center (C1) of the hot water inlet (A) and the center (C2) of the cold water inlet (B), and the center of the hot water inlet (A) ( If the middle point with C1) is called the middle point (Q), the O-ring 10 is preferably installed in the area (F) between the middle point (P) and the middle point (Q).

Additionally, the length dimension of this area (F) varies depending on the length dimension between the center (C1) of the hot water inlet (A) and the center (C2) of the cold water inlet (B), but is generally 3 mm to 4 mm. That's about it.

In this way, since the O-ring 10 supporting the control valve body 2 is made of a specific material, the vibration of the valve body 2 is more absorbed by its shock absorbing properties (because the rebound elasticity is small). This can further suppress the occurrence of abnormal noise. In addition, since the rebound elasticity is small, the sliding resistance of the control valve body 2 is small, the control valve body can follow the expansion and contraction of the actuator 4 well, and temperature control performance can be improved.

Furthermore, even when the collapse rate of the O-ring 10 supporting the control valve body 2 is set to 8.3% or less, shock absorbency can be further exhibited and vibration of the valve body 2 can be more absorbed. In addition, since the collapse rate of the O-ring 10 is set to 8.3% or less, the sliding resistance of the valve body 2A is reduced, the followability of the control valve body to the expansion and contraction of the actuator 4 is good, and the temperature control performance is improved. It can be improved.

Moreover, the O-ring 10 of the above-mentioned specific material is installed on the hot water valve seat side rather than the midpoint of the distance connecting the center of the hot water inlet A and the center of the cold water inlet B, and this one O- The control valve element 2 is supported by the ring 10. Therefore, the vibration of the valve body 2 can be absorbed more, and the generation of abnormal noise can be further suppressed. In addition, since it is supported by one O-ring 10, the sliding resistance of the valve body 2A is reduced, the control valve body can follow the expansion and contraction of the actuator 4 well, and temperature control performance can be improved. there is.

Example

(Comparative Example 1)

The material of the O-ring supporting the control valve body is EPDM (hardness 70°, rebound modulus 61%), and the O-ring 10 is placed at the hot water inlet (10) as shown in FIG. 8 so that the collapse rate is 8.3%. It was placed at the midpoint (on a line) (P) of the distance connecting the center (C1) of A) and the center (C2) of the cold water inlet (B).

In addition, the hot water temperature is 80 degrees, the cold water temperature is 20 degrees, the inlet pressure at the hot water inlet (A) and the cold water inlet (B) are the same, and the occurrence of abnormal noise when the inlet pressure is changed as shown in Table 1. was investigated. Additionally, the faucet was completely open. The results are shown in Table 1.

(Example 1)

In Comparative Example 1, the same conditions as Comparative Example 1 except that the O-ring supporting the control valve element was made of propylene hexafluoride-vinylidene fluoride copolymer (FKM) (hardness 70°, rebound modulus 14%). The occurrence of abnormalities was investigated. The results are shown in Table 1.

(Example 2)

The occurrence of cracks was investigated under the same conditions as in Example 1, except that the collapse rate of the O-ring 10 in Example 1 was set to 3.3%. The results are shown in Table 1.

(Example 3)

In addition to changing the arrangement of the O-ring 10 in Example 1 to the side of the hot water inlet A (inside the area F) rather than the intermediate point P, as shown in FIG. The occurrence of joints was investigated under the same conditions. The results are shown in Table 1.

(Example 4)

In Example 4, the O-ring 10 supporting the control valve element 2 is made of propylene hexafluoride-vinylidene fluoride copolymer (FKM), the collapse rate is set to 3.3%, and as shown in FIG. Likewise, the O-ring 10 was installed on the hot water inlet A side (in area F) rather than the intermediate point P, and the occurrence of noise was investigated under the same conditions as in Example 1. The results are shown in Table 1.

As revealed in Table 1, comparing Example 1 and Comparative Example 1, a joint occurred at a pressure of 0.3 MPa in Comparative Example 1, whereas in Example 1, the O-ring had excellent shock absorption (rebound) Since it is a material with low elasticity, the occurrence of joints was suppressed up to a pressure of 0.65 Mpa.

Additionally, as shown in Example 2, when the collapse rate of the O-ring 10 supporting the valve body was small, the occurrence of noise was suppressed up to a higher pressure of 0.75 Mpa.

In addition, as shown in Example 3, when the support position of the O-ring 10 supporting the valve body is installed near the hot water inlet, as in Example 2, noise occurs when the pressure reaches 0.75 Mpa. suppressed.

Additionally, in Example 4, the occurrence of noise was suppressed up to a pressure of 0.75 Mpa.

Additionally, this 0.75 Mpa is the maximum operating pressure specified in the JIS standard, and use beyond this is not expected.

As described above, by using an O-ring made of a material with excellent shock absorption (small rebound elasticity), the occurrence of noise can be suppressed even at higher pressures. In addition, by reducing the collapse rate and installing the support position of the valve body by the O-ring from the center to the hot water inlet side, the occurrence of abnormal noise can be further suppressed. In addition, by using an O-ring made of a material with excellent shock absorption (small rebound elasticity), the sliding resistance of the valve body is reduced, the control valve body can follow the expansion and contraction of the actuator better, and temperature control performance can be improved. there is.

In addition, the properties of butyl rubber, like those of propylene hexafluoride-vinylidene fluoride copolymer (FKM), are excellent in shock absorption (low rebound elasticity), so it is believed that the same results as the above examples are obtained. Additionally, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention.

1: Casing 1a: First body
1b: second body 1d: hot water valve seat
1e: Cold water valve seat A: Hot water inlet
B: Cold water inlet C: Mixing chamber
D: Mixed water outlet
E: Area between the hot water inlet and the midpoint between the hot and cold water inlets.
2: Control valve body 2A: Valve body
2B: Deflector receiving portion 2C: Rib
2D: Bottom 2E: Shaft
2a: hot water valve 2b: cold water valve
3: Deflector 4: Actuator
10: O-ring
P: Midpoint between the center of the hot water inlet and the center of the cold water inlet

Claims (3)

A cylindrical casing having a hot water inlet, a cold water inlet, a mixing chamber for mixing hot and cold water, and a mixed water outlet for discharging the mixed water;
an actuator accommodated within the casing,
It has at least a control valve body that adjusts the opening degrees of the hot water inlet and the cold water inlet, and the control valve body advances and retreats in the axis direction of the casing by expansion and contraction of the actuator, so that the temperature of the mixed hot and cold water is adjusted to the set temperature. In the hot/cold water mixing faucet,
an O-ring disposed between the casing and the control valve body and between the hot water inlet and the cold water inlet,
The O-ring is made of propylene hexafluoride-vinylidene fluoride copolymer (FKM) or butyl rubber,
The O-ring is maintained in the casing and disposed in an area between the hot water inlet and the midpoint of the hot water inlet and the cold water inlet. According to clause 1,
A hot/cold water mixing faucet, characterized in that the collapse rate of the O-ring is 8.3% or less. delete

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