JP3395655B2 - Hot water mixing valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing valve, and more particularly to a thermostat type hot and cold water mixing valve in which a valve element is biased from both sides by a bias spring and a temperature sensitive spring made of a shape memory material.

[0002]

2. Description of the Related Art As a thermostatic hot water mixing valve,
It is known to use a temperature sensitive spring made of a shape memory material such as a shape memory alloy. As described in JP-A-6-147333, in this type of hot and cold water mixing valve, a water seat and a hot water seat are provided in a cylindrical valve body, and the valve body moves forward and backward in the axial direction. And a bias spring for biasing the valve body in the approach direction of the water sheet, and a biasable spring for biasing the valve body in the approach direction of the water sheet. A temperature control handle for advancing and retracting the temperature sensitive spring or the bias spring is installed. FIG. 4 is a sectional view showing an example of this conventional hot and cold water mixing valve.

In the following description, left and right are shown in FIG.
The left and right are referred to.

A water inlet 1 is provided on the peripheral surface of a cylindrical body 10.
2 and an inlet 14 for hot water are provided, and an outlet 16 for mixed water is provided at the left end. The water inlet 12 is located on the left side of the hot water inlet 14. These inlets 1
The seat portion is provided by recessing the inner peripheral surface of the body between the second and second portions. That is, the left end surface of this recess is the water sheet 22 and the right end surface is the hot water sheet 24.

The valve element 33 is provided with a central shaft portion 33C located on the axial center of the body 10 and a cylindrical portion 33E connected to the central shaft portion 33C via a center flange 33D.
And a seal ring 73 that is mounted on the outer periphery of the cylindrical portion 33E and is in watertight contact with the inner peripheral surface of the body 10, and a through hole 33d provided on the flange 33D.

The valve element 33 can be pressed to the right by a temperature sensitive spring 40 made of a shape memory alloy, and the bias spring 4
It can be pressed to the left by 3. A rotating shaft 50 and an advancing / retreating shaft 52 are arranged in order to move the bias spring 43 forward and backward.

The handle mounting portion 50a at the right end of the rotary shaft 50
Protrudes rightward from the shaft insertion hole 60 of the body 10 and a handle (not shown) is fixed. This handle mounting part 5
Since the E-ring 62 is fitted to the neck portion of 0a, the rotary shaft 50 cannot move forward and backward. 64 indicates an O-ring.

The left end side of the rotary shaft 50 has a cylindrical shape, and a female screw 50b is provided on the inner circumference thereof. Male screw 52b provided on the outer periphery on the right end side of the tubular forward / backward shaft 52
Is engaged with the female screw 50b, and the forward / backward shaft 52 moves forward and backward by the rotation of the rotary shaft 50.

A groove 33m (FIG. 5) is provided around the outer periphery of the valve element 33, and a seal ring 73 made of fluororesin having a high slidability is attached to the groove 33m. The seal ring 73 is in watertight contact with the inner peripheral surface of the body 10. That is, the seal ring 73 is provided with a slit having a shape that obliquely cuts the ring, so that the seal ring 73 can be elastically deformed in the diameter expanding and contracting directions. Due to this elasticity, the outer peripheral surface of the seal ring 73 is elastically pressed against the inner peripheral surface of the body 10.

In the hot and cold water mixing valve constructed as described above, the advancing / retreating shaft 52 advances and retracts in the axial direction of the valve by turning the temperature control handle, and the biasing force of the valve element by the bias spring 43 is changed to set the water discharge. The temperature is changed.

That is, when the advancing / retreating shaft 52 is retreated to the right,
Since the biasing force of the bias spring 43 decreases, the valve body 3
No. 3 approaches the hot water sheet 24 and moves away from the water sheet 22, and the set temperature drops. When the advancing / retreating shaft 52 is moved forward, on the contrary, the biasing force of the bias spring 43 increases, the valve body 33 separates from the hot water seat 24 and approaches the water seat 22, and the set temperature rises. When the mixed water temperature deviates from the set temperature due to fluctuations in the hot water supply temperature or the hot water supply pressure in the state where the mixed water at the set temperature is being discharged, the temperature sensing spring 40 expands or contracts, and the valve element 33 moves to the right or left. Shift to and the mixed water temperature will automatically return to the set temperature.

[0012]

In the conventional hot and cold water mixing valve shown in FIG. 4, the hunting of the temperature sensitive spring 40 (e.g., when the water discharge set temperature is suddenly raised while only water is being discharged). Micro-vibration that repeatedly expands and contracts finely) is generated, which may cause abnormal noise.

Various studies have been conducted on the cause of the hunting phenomenon of the temperature sensitive spring 40. The hunting phenomenon is caused by the fact that the water pressure at the water inlet 12 is generally higher than the hot water supply pressure at the hot water inlet 14. It was found to be based on the following mechanism.

That is, as shown in FIG. 5A, when only water is discharged, the valve body 33 is in close contact with the hot water seat 24, and the valve body 33 and the water seat 22 are wide. In this case, the seal ring 73 in the groove 33m on the outer periphery of the valve body 33 is water-tightly pressed against the right end surface (groove side wall surface) of the groove 33m by the water pressure from the water inlet 12.

When the handle is turned from this state to change the water discharge set temperature to a higher temperature, the bias spring 43 pushes the valve body 33 to the left as shown in FIG. 5 (b). In this case, the seal ring 73 is still in close contact with the right end surface of the groove 33m by being pushed by the water pressure from the water inlet 12.

By the way, when only water is discharged as shown in FIG. 5A, the temperature-sensitive spring 40 is cold, but FIG.
When the hot water begins to flow as shown in (b), the temperature of the temperature sensitive spring 40 rises, the pressing force of the temperature sensitive spring 40 to the right increases, and the valve element 33 is slightly pushed back to the right (FIG. 5 ( See c)). This pushing back amount δ is very small, but the temperature sensitive spring 40
Has extremely good temperature response characteristics, and the push-back speed of the temperature-sensitive spring 40 is considerably high. Therefore, when the valve body 33 is pushed back to the right by the temperature sensitive spring 40 as shown in FIG. 5C, the seal ring 73 cannot follow the shift of the valve body 33, and the seal ring 73 moves to the groove 33m. A suspended state appears, which is separated from both the right end face and the left end face. When the seal ring 73 is in such a suspended state, the water pressure from the water inlet 12 is transmitted to the hot water inlet 14 through the outer circumference of the valve body 33 and the circumference of the seal ring 73. As mentioned above, since this water pressure is much higher than the hot water supply pressure, this water pressure blocks the inflow of hot water into the hot water inlet 14.

When the inflow of hot water is blocked in this way, the temperature of the mixed water is lowered, so that the temperature sensitive spring 40 contracts and the valve element 33 is pushed by the bias spring 43 to the left in FIG. 5 (b). Shift to. Then, the temperature of the mixed water rises again, so that the temperature-sensitive spring 40 expands again and the state shown in FIG. 5 (c) is reached.
It returns to the state of FIG.5 (b).

Thus, the state of FIG. 5B and the state of FIG.
By alternately and repeatedly adopting the state of (c), the temperature sensitive spring 40 vibrates finely for a long period of time, and abnormal noise is generated.

Such hunting may occur even when a water stop plug (not shown) provided on the upstream side of the water inlet 12 is suddenly opened.

The present invention was made in view of such technical problems, and an object of the present invention is to provide a hot and cold water mixing valve in which hunting of a temperature sensitive spring and generation of abnormal noise accompanying it are prevented.

[0021]

The hot and cold water mixing valve of the present invention according to claim 1 is provided with a water seat and a hot water seat in a tubular valve body, and is movable back and forth in the axial direction of the valve body. And a tubular valve body that can be brought into and out of contact with the water seat and the hot water seat is arranged coaxially with the valve body, and a temperature sensitive spring for urging the valve body in the hot water seat approaching direction and the valve body Is provided with a bias spring for urging the valve in the direction toward the water seat, and a discharge water temperature setting member for advancing and retracting the temperature sensitive spring or the bias spring in the axial direction of the valve body, and a groove is formed on the outer peripheral surface of the valve body. In a hot and cold water mixing valve in which a seal ring which is circumferentially arranged and which is arranged in the groove is slidably in contact with an inner peripheral surface of the valve body, the valve body is arranged between the water seat and the hot water seat. , The grooves are spaced in the axial direction of the valve body. A plurality of lines are provided, a seal ring is provided in each groove, and a water guiding opening is provided in the valve body to connect the valve body outer peripheral side and the valve body outer peripheral side between the grooves. It is characterized by that.

In such a hot and cold water mixing valve of the present invention, since the outer peripheral portion of the valve body between the seal rings and the inner peripheral side of the valve body communicate with each other through the opening, as shown in FIG. The water pressure that is trying to propagate from the water inlet side to the hot water inlet side along the outer circumference leaks to the inner circumference side of the valve body through the opening, so that the inflow of hot water to the hot water inlet is not blocked. .

Therefore, hunting of the temperature sensitive spring is prevented, and abnormal noise is prevented.

In the hot and cold water mixing valve of the present invention according to claim 2, a water seat and a hot water seat are provided in a cylindrical valve body, and the valve body is capable of advancing and retracting in the axial direction.
A tubular valve body that can be brought into and out of contact with the water seat and the hot water seat is arranged coaxially with the valve body, and a temperature sensitive spring for urging the valve body in the hot water seat approaching direction and the valve body as the water seat. A bias spring for urging in the approaching direction and a discharge water temperature setting member for moving the temperature sensitive spring or the bias spring forward and backward in the axial direction of the valve body are provided, and a groove is provided around the outer peripheral surface of the valve body. In a hot and cold water mixing valve in which a seal ring arranged in the groove slidably contacts an inner peripheral surface of the valve body, a hot water valve body and a water valve body are provided as the valve bodies, and the water valve body is provided. The water sheet and the hot water sheet are disposed between the hot water valve body and the hot water valve body, the grooves are respectively provided on the outer circumferences of the water valve body and the hot water valve body, and a seal ring is provided in the groove. It is what

In such a hot and cold water mixing valve, the water from the water inlet flows into the inside of the wide valve body through the narrow water passage between the water seat and the water valve body. The water pressure during the passage is much lower than the original pressure of the water. That is, this water pressure is not high enough to prevent the inflow of hot water from the hot water inlet. Therefore, no matter how the water valve body and the hot water valve body move back and forth, the inflow of hot water is not blocked by the water pressure, and the hunting of the temperature sensitive spring 40 does not occur.

A hot and cold water mixing valve according to a third aspect of the present invention is provided with a water guiding path according to the second aspect, which connects a portion of the outer circumference of the hot water valve body on the downstream side of the seal ring and the inner circumferential side of the hot water valve body. It is characterized by

In such a hot and cold water mixing valve, expansion of the temperature sensitive spring which may be caused by leakage of hot water between the outer circumference of the hot water valve body and the inner circumference of the valve body is prevented.

A hot and cold water mixing valve according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the seal ring is made of a highly slidable synthetic resin.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to the drawings. 1 is a cross-sectional view of the hot and cold water mixing valve according to the first embodiment, FIG. 2 is a cross sectional view of the hot and cold water mixing valve according to the second embodiment, and FIG. 3 is a cross sectional view of the hot and cold water mixing valve according to the third embodiment. FIG. In the description of the embodiments below,
Left and right refer to left and right in FIGS.

In the embodiment shown in FIG. 1, two grooves 33m are provided on the outer periphery of the valve body 33 at intervals in the axial direction of the valve body 10, and each groove 33m is made of a fluororesin seal. A ring 73 is attached.

In the portion between the grooves 33m, 33m, a water guiding opening 80 that connects the outer peripheral side and the inner peripheral side of the valve element 33 is communicated.
Is provided.

Other configurations are the same as those in FIG. 4, and the same reference numerals indicate the same parts.

The water discharge temperature adjusting function of the hot and cold water mixing valve of FIG. 1 is exactly the same as that of FIG.

In the hot and cold water mixing valve of FIG. 1, hunting of the temperature sensitive spring 40 is prevented as follows.

That is, in the hot and cold water mixing valve of FIG. 1, since the outer peripheral portion of the valve body 33 between the seal rings 73 and the inner peripheral side of the valve body communicate with each other through the opening 80, as shown in FIG. 5C. Along the outer circumference of the valve body, from the water inlet 12 side to the hot water inlet 1
The water pressure trying to propagate to the No. 4 side leaks to the inner peripheral side of the valve body 33 through the opening 80, and the inflow of the hot water into the hot water inlet 14 is not blocked. Therefore, hunting of the temperature-sensitive spring 40 is prevented, and abnormal noise is also prevented.

Next, a second embodiment will be described with reference to FIG.

A water inlet 1 is provided on the peripheral surface of the cylindrical body 10.
2 and an inlet 14 for hot water are provided, and an outlet 16 for mixed water is provided at the left end. The hot water inlet 14 is located on the left end side of the water inlet 12. These inlets 1
The protrusion 20 is provided by projecting the inner circumferential surface of the body between 2 and 14 inward. The right end surface of the protrusion 20 is a water sheet 22, and the left end surface is a hot water sheet 24.
Has become.

An annular water valve body 32 facing the water seat 22 and an annular water valve body 34 facing the hot water seat 24 are fitted to the cross-shaped portion 30 a of the main shaft 30. The cross-shaped portion 30a has a cross-shaped cross section perpendicular to the axis of the main shaft 30.

The spindle 30 can be pressed to the right by a temperature sensitive spring 40 made of a shape memory alloy, and the bias spring 4
It can be pressed to the left by 3. This spindle 30
A rotating shaft 50 and an advancing / retreating shaft 52 are arranged so as to surround the main shaft 30 so as to advance and retreat in the left-right direction.

The handle mounting portion 50a at the right end of the rotary shaft 50
Protrudes rightward from the shaft insertion hole 60 of the body 10 and a handle (not shown) is fixed. This handle mounting part 5
Since the E-ring 62 is fitted to the neck portion of 0a, the rotary shaft 50 cannot move forward and backward. 64 indicates an O-ring.

The left end side of the rotary shaft 50 has a cylindrical shape, and a female screw 50b is provided on the inner circumference thereof. Male screw 52b provided on the outer periphery on the right end side of the tubular forward / backward shaft 52
Is engaged with the female screw 50b, and the forward / backward shaft 52 moves forward and backward by the rotation of the rotary shaft 50.

Grooves are provided around the outer peripheries of the water valve body 32 and the hot water valve body 34, and seal rings 72 and 74 made of fluororesin having high slidability are attached to the respective grooves. These seal rings 72, 74 are in watertight contact with the inner peripheral surface of the body 10.

The operation of the hot and cold water mixing valve thus configured will be described below.

The pressing force of the spring 43 acts leftward on the main shaft 30 via the water valve body 32, and the pressing force of the temperature sensitive spring 40 acts rightward on the main shaft 30 to balance the pressing forces of the two. However, the main shaft 30 and the valve bodies 32 and 34 are stopped.

In this medium temperature water discharge state, when the mixed water temperature becomes lower than the set temperature due to fluctuations in hot water supply temperature, hot water supply pressure, etc., the temperature sensitive spring 40 contracts, the main shaft 30 moves to the left, and the water sheet 22 The water flow gap between the water valve body 32 and the water valve body 32 narrows, and the hot water flow gap between the hot water sheet 24 and the hot water valve body 34 widens, and the mixed water temperature recovers (rises) to the set temperature.
To do. On the contrary, when the temperature of the mixed water becomes higher than the set temperature, the temperature sensitive spring 40 expands, the water valve body 32 and the hot water valve body 34 are located to the right along with the main shaft 30, and the water circulation gap widens. The hot water flow gap narrows, and the temperature of the mixed water recovers (decreases) to the set temperature.

When the handle is rotated in the forward direction to raise the water discharge set temperature, the advancing / retreating shaft 52 moves leftward as the rotating shaft 50 rotates in the forward direction. As a result, the spring 4
3, the pressing force to the left of the valve 3 becomes stronger, and the main body 30 and the valve body 3
2, 34 shift to the left, the hot water flow gap widens, the water flow gap narrows, and the temperature of the mixed water rises. After the valve bodies 32 and 34 are shifted, the pressing force of the temperature-sensitive spring 40 to the right and the pressing force of the spring 43 to the left are balanced. When the temperature of the mixed water deviates from the set temperature, the temperature sensitive spring 40 expands and contracts to restore the temperature of the mixed water to the set temperature.

When the handle is rotated in the opposite direction in order to lower the water discharge set temperature within the middle temperature range, the advancing / retreating shaft 52 moves to the right as the rotating shaft 50 rotates in the opposite direction, As a result, the pressing force of the spring 43 to the left becomes small, the valve bodies 32 and 34 shift to the right together with the main shaft 30,
As the hot water flow gap narrows, the water flow gap widens, and the temperature of the mixed water decreases. After the valve bodies 32, 34 are shifted, the pressing force of the temperature-sensitive spring 40 to the right and the pressing force of the springs 42, 44 to the left are balanced. When the temperature of the mixed water deviates from the set temperature, the temperature sensitive spring 40 expands and contracts to restore the temperature of the mixed water to the set temperature.

In this embodiment, the water inlet 12
Since the water from the inside flows into the wide body 10 through the narrow water passage between the water seat 22 and the valve body 32, the water pressure after passing the water passage is considerably higher than the original pressure of the water. It's going down. That is, this water pressure is not high enough to block the inflow of hot water from the hot water inlet. Therefore, the valve body 32,
No matter how the 34 moves forward or backward, the inflow of hot water is not blocked by the water pressure, and the hunting of the temperature sensitive spring 40 does not occur.

A third embodiment will be described with reference to FIG. In this embodiment, in the hot and cold water mixing valve of FIG. 2, a water guiding opening 9 that connects the outer peripheral side and the inner peripheral side of the hot water valve body 34 to the downstream side of the seal ring 74 of the hot water valve body 34.
0 is provided, and other configurations and operations are the same as those in FIG.

In the hot and cold water mixing valve of FIG. 3, hot water which may leak through the outer circumference of the hot water valve body 34 does not directly contact the temperature sensitive spring 40. (In the case of FIG. 2, the hot water valve body 3
If the hot water leaks along the outer circumference of 4, the hot water may directly contact the temperature sensitive spring 40 and the temperature sensitive spring 40 may expand. Therefore, in the hot and cold water mixing valve of FIG. 3, the temperature sensitive spring 40 always expands and contracts in response to the temperature of the mixed water, and the temperature of the mixed water is appropriately controlled.

[0051]

As described above, according to the present invention, the hunting of the temperature-sensitive spring does not occur even when the water discharge set temperature is suddenly raised or the stop cock is suddenly opened, and the occurrence of abnormal noise is prevented. It

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hot and cold water mixing valve according to a first embodiment.

FIG. 2 is a sectional view of a hot and cold water mixing valve according to a second embodiment.

FIG. 3 is a sectional view of a hot and cold water mixing valve according to a third embodiment.

FIG. 4 is a cross-sectional view of a hot and cold water mixing valve according to a conventional example.

FIG. 5 is an enlarged sectional view of a seal ring portion of a conventional hot and cold water mixing valve.

[Explanation of symbols]

10 valve body 12 Water inlet 14 Hot water inlet 22 Water sheet 24 hot water sheet 30 spindles 32 water valve 33 valve body 33m groove 34 Hot water valve 43 Bias spring 50 rotation axis 50a Handle mounting part 50b female screw 50c collar part 52 axis 52b male screw 72, 73, 74 Seal ring 80, 90 openings

Continuation of the front page (56) Reference JP-A-6-147333 (JP, A) JP-A-8-42744 (JP, A) JP-A-8-285128 (JP, A) JP-A-9-89155 (JP , A) Actual development Sho 63-171775 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 11/07 F16K 31/64

Claims (4)

(57) [Claims] 1. A tubular valve body is provided with a water seat and a hot water seat, which is capable of moving forward and backward in the axial direction of the valve body, and which is capable of coming into contact with and separating from the water seat and the hot water seat. A valve body is disposed coaxially with the valve body, a temperature-sensitive spring for urging the valve body toward the hot water seat, a bias spring for urging the valve body toward the water seat, and the temperature-sensitive spring. Alternatively, a discharge water temperature setting member for advancing and retracting the bias spring in the axial direction of the valve body is provided, a groove is provided around the outer peripheral surface of the valve body, and a seal ring arranged in the groove is provided in the valve body. In a hot and cold water mixing valve slidably in contact with an inner peripheral surface, the valve body is disposed between a water seat and a hot water seat, and the grooves are arranged at intervals in the axial direction of the valve body. The groove is provided with a seal ring in each groove. It is, hot and cold water mixing valve, characterized in that the opening for water guiding communicating the valve body outer peripheral side and the valve body periphery between the grooves to each other are provided in the valve body. 2. A tubular valve body is provided with a water seat and a hot water seat, which is movable in the axial direction of the valve body, and which can be brought into and out of contact with the water seat and the hot water seat. A valve body is disposed coaxially with the valve body, a temperature-sensitive spring for urging the valve body toward the hot water seat, a bias spring for urging the valve body toward the water seat, and the temperature-sensitive spring. Alternatively, a discharge water temperature setting member for advancing and retracting the bias spring in the axial direction of the valve body is provided, a groove is provided around the outer peripheral surface of the valve body, and a seal ring arranged in the groove is provided in the valve body. In a hot and cold water mixing valve slidably in contact with an inner peripheral surface, a hot water valve body and a hot water valve body are provided as the valve bodies, and the hot water sheet and the hot water sheet are provided between the hot water valve body and the hot water valve body. And the grooves are provided on the outer circumferences of the water valve body and the hot water valve body, respectively. The hot and cold water mixing valve is characterized in that the seal ring is disposed in the groove. 3. The water conduit according to claim 2, wherein a water guiding passage is provided to connect a portion of the outer periphery of the hot water valve body on the downstream side of the seal ring and the inner circumferential side of the hot water valve body. Hot and cold water mixing valve. 4. The hot and cold water mixing valve according to any one of claims 1 to 3, wherein the seal ring is made of a highly slidable synthetic resin.