JPH0942493A - Hot water/water mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact hot water/water mixing divice which obtains a proper temperature through adjustment of a mixing ratio of hot water and water which shows speedy responsiveness. SOLUTION: A holding groove 28 holds an elastic seal member 29 at one part of a sliding guide surface 27 of a housing 11. A sliding groove 30 is formed on an outer peripheral surface of a valve body 20. With such structure, sliding frictional resistance of the valve body 20 is reduced, to obtain a fine and small temperature sensing spring 21. It is thus possible to improve heat responsiveness, obtain sensitive and speedy operation in response to fluctuation of temperature and pressure, automatically correct an opening of the valve body 20 according to the fluctuation of supplied pressure, and thereby to obtain stable mixture temperature. Since forces of the springs 21, 22 are reduced, operation force of an energization adjusting means 23 is reduced, and thereby a small-sized compact hot water/water mixing device is obtained.

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 apparatus for adjusting a mixing ratio of hot water and water to obtain an appropriate temperature.

[0002]

2. Description of the Related Art Conventionally, as this kind of hot and cold water mixing apparatus,
There is one as shown in FIG. 8 (for example, JP-A-6-147333).

In FIG. 8, a water inlet 1a and a hot water inlet 1b are axially spaced on the peripheral wall of the housing 1.
And a mixed water outlet 1c is opened on the downstream side communicating with the inlets 1a and 1b. The water inlet 1a communicates with a water supply chamber in the main body of the hot water mixing apparatus, and similarly, the hot water inlet 1b and the mixed water outlet 1c respectively communicate with the hot water chamber and the mixing chamber, and the mixed water passes through the mixing chamber. It is discharged from the discharge end.

Inside the housing 1, a water valve seat 2 and a hot water valve seat 3 are provided on the water inlet 1a side and the hot water inlet 1b side, respectively. Between the water valve seat 2 and the hot water valve seat 3, a temperature-adjustable valve body 4 having a substantially H-shaped vertical cross-section that is movable in the axial direction is incorporated. This valve body 4
Both ends in the axial direction are used as seating surfaces for the water valve seat 2 and the hot water valve seat 3, and a communication port 4b is provided in a partition wall 4a that divides the water side from the hot water side.
Has been opened. An annular packing 5 is incorporated around the valve body 4, and the packing 5 is brought into close contact with the inner wall of the housing 1 to shut off the water side and the hot water side.

The inside of the housing 1 is divided into a water chamber 1d and a hot water chamber 1e by a valve body 4, and a mixing chamber 1f is formed downstream of these. A sleeve 6 whose one end abuts against the partition wall 4a of the valve body 4 is incorporated from the mixing chamber 1f to the water chamber 1d. The sleeve 6 has an opening 6a for water formed in the peripheral wall facing the water chamber 1d, and a communication port of the partition wall 4a. It is formed to have an inner diameter surrounding 4b. Then, the water chamber 1d and the hot water chamber 1e are communicated with the mixing chamber 1f by the sleeve 6, and the water and hot water having a volume ratio according to the valve opening degree of the valve body 4 with respect to the water valve seat 2 and the hot water valve seat 3 are mixed chambers. Is supplied to 1f.

In the mixing chamber 1f, a shape memory alloy spring 7 having one end which is in contact with the inner wall of the housing 1 and the other end which is fitted to the end face of the sleeve 6 is incorporated. This spring 7 has a function of expanding and contracting according to the temperature of the mixed water passing through the mixing chamber 1f, and shifting the valve body 4 so that the temperature of the discharged mixed water is maintained at the set temperature.

The position of the valve body 4 is set by the handle 8a of the spindle 8 which is screwed to the housing 1. One end of this spindle 8 is connected to the spring 7 via a slip washer, and is moved in the axial direction by operating the handle 8a, so that the spring 7
The valve body 4 is set to a position corresponding to the set temperature value via. Further, a bias spring 9 for urging the valve body 4 in the direction opposite to the spring 7 is incorporated in the hot water chamber 1e, and the bias spring 9 has a function of moving the valve body 4 to the water valve seat 2 side and sets the temperature. The position of the valve body 4 is balanced with respect to the spring 7 for use so that the mixing ratio of hot and cold water is adjusted.

However, in the above structure, since the packing 5 is integrated with the valve body 4 as shown in FIG. 9, the acting force F due to the pressure difference between the water supply pressure Pc and the hot water supply pressure PH is the valve body 4. Since it has a bad effect of pushing the button and deviating from the set temperature, a configuration as shown in FIG. 10 has been proposed. In FIG. 10, the inner wall guide 1g is provided with an annular recess 1h, and the packing 5 is fitted and held in the recess 1h. The valve body 4 is pushed by the pressure difference between the water supply pressure Pc and the hot water supply pressure PH. It is explained that the value of the force F becomes zero and the set temperature can be stably maintained. However, in reality, the structure shown in FIG. 10 is not a structure in which the effective pressure receiving area that pushes the valve body 4 due to the action of the water supply pressure Pc and the hot water supply pressure PH can be made zero.
The acting force F due to the differential pressure between c and the hot water supply pressure PH cannot be made zero.

[0009]

Further, in the conventional hot and cold water mixing apparatus as described above, the water inlet 1a and the hot water inlet 1 are provided.
Since the sliding frictional force of the packing 5 that seals between b is large, it is possible to reduce the temperature hysteresis and the temperature deviation by taking measures such as increasing the forces generated by the shape memory alloy spring 7 and the bias spring 9. You will need it.

For example, in FIG. 8, when the valve body 4 is stable at a position where the forces of the shape memory alloy spring 7 and the bias spring 9 are balanced, the feed water pressure Pc fluctuates and the temperature of the mixing chamber 1f fluctuates. Then, as the temperature of the shape memory alloy spring 9 changes, the force of the spring 9 changes and the valve body 4 should be moved to maintain the set temperature. Movement of the body 4 is inhibited. 9 and 10, since the sliding surface with the packing 5 is a large-diameter seal portion that is almost the same as the outer diameter of the valve body 4, the sliding frictional force due to the packing 5 is large. Similarly, the sliding frictional resistance of the packing 5 hinders the movement of the valve body 4.

Therefore, by increasing the amount of change in the force of the spring 9 due to the temperature change, it is possible to relatively reduce the influence of sliding friction due to the packing 5. However, both the shape memory alloy spring 7 and the bias spring 9 are thick and large in order to greatly change the force generated by the spring 9 due to temperature change.

Therefore, the size of the hot and cold water mixing device becomes large, the heat capacity of the thick and large shape memory alloy spring 7 becomes large and the response time becomes slow, and the cost of the shape memory alloy spring 9 and the hot and cold water mixing device becomes high.
There were many problems such as heavy operation of the handle 8a when changing the set temperature.

The present invention is intended to solve such a conventional problem, and it is a first object of the present invention to provide a compact hot and cold water mixing device having a quick response.

A second object is to effectively and effectively make the temperature sensing body spring and the bias spring thin and small, and have a quick response,
The object is to provide a hot and cold water mixing device which is compact and can be operated with a small driving force.

A third object of the present invention is to provide a hot and cold water mixing apparatus which is excellent in sliding property and sealing property between a valve element and an elastic seal member without requiring dimensional accuracy, is compact and can be operated lightly. .

A fourth object is to prevent valve vibration and temperature hunting due to the vibration in a hot and cold water mixing apparatus having a slidable valve element.

The fifth purpose is to prevent fluctuations in the supply pressure.
An object of the present invention is to provide a hot and cold water mixing device capable of more accurate and stable temperature control.

A sixth object is to provide a hot and cold water mixing device which can be controlled by an electric biasing force adjusting means having a small driving force, and which can perform stable temperature control with high speed response.

A seventh object is to provide an inexpensive and compact hot and cold water mixing device which can be driven and controlled by a thin and small shape memory alloy spring and a small motor.

[0020]

SUMMARY OF THE INVENTION In order to achieve the first object of the present invention, a housing in which a water inlet and a hot water inlet are opened in a peripheral wall with an axial gap therebetween, and the water inlet and the hot water inlet are provided. A substantially cylindrical valve body that adjusts a mixing ratio of hot water and water that is movably installed in the axial direction by using an inner wall of the housing between the inlet and the slide guide surface, and an axis of the valve body on the water inlet side. Water valve seat facing one end face in the direction, and a hot water valve seat facing the other end face in the axial direction of the valve body on the hot water inlet side,
The mixed water outlet provided on the downstream side of the water valve seat, the temperature sensing body spring for urging the valve body in the direction of decreasing the proportion of hot water as the temperature of the mixed water rises, and the valve body A bias spring for biasing in the opposite direction to the warm body spring, biasing force adjusting means for varying the biasing force of at least one of the two springs to adjust the mixing temperature, and a part of the sliding guide surface are provided. A holding groove for holding the elastic seal member and a sliding groove provided on the outer peripheral surface of the substantially cylindrical valve body and sliding with respect to the elastic seal member.

Further, in order to achieve the second object of the present invention, the valve body is made of tetrafluoroethylene resin or tetrafluoroethylene compound resin, or ultra high molecular weight polyethylene resin or ultra high molecular polyethylene compound resin. It is a thing.

Further, in order to achieve the third object of the present invention, the holding groove is formed in an arcuate cross section, and the elastic seal member is composed of an O-ring.

Further, in order to achieve the fourth object of the present invention, the valve body is provided with a chamfer on the surface facing the water valve seat and the hot water valve seat, and the valve body and the water valve seat and the hot water valve seat are provided. The width of the parallel opposing surfaces of the gap is 1 mm or less.

Further, in order to achieve the fifth object of the present invention, the valve body is constructed such that the outer diameter on the water valve seat side of the sliding groove is smaller than the outer diameter on the hot water valve seat side.

In order to achieve the sixth object of the present invention, between the water inlet and the hot water inlet, the housing having the water inlet and the hot water inlet opened in the circumferential wall with a space in the axial direction. A substantially cylindrical valve body for adjusting the mixing ratio of hot water and water, which is movably installed in the axial direction using the inner wall of the housing as a sliding guide surface, and one end surface in the axial direction of the valve body on the water inlet side. , A hot water valve seat facing the other end surface of the valve body in the axial direction on the hot water inlet side, a mixed water outlet provided on the downstream side of the hot water valve seat, and the mixed water. A temperature-sensitive body spring for urging the valve body in a direction of decreasing the proportion of hot water as the temperature rises, a bias spring for urging the valve body in a direction opposite to the temperature-sensitive body spring, and the two springs. An electric biasing force adjusting means for adjusting the mixing temperature by varying the biasing force of at least one of A holding groove provided on a part of the sliding guide surface for holding the elastic seal member; a sliding groove provided on the outer peripheral surface of the substantially cylindrical valve body for sliding with respect to the elastic seal member; Temperature detection means for detecting the temperature of the mixed water, temperature setting means for setting the target value of the mixed water temperature, the temperature detected by the temperature detection means and the target value set by the temperature setting means And an electronic control means for controlling the electric biasing force adjusting means.

In order to achieve the seventh object of the present invention, between the water inlet and the hot water inlet, the housing having the water inlet and the hot water inlet opened in the peripheral wall with a space in the axial direction. A substantially cylindrical valve body for adjusting the mixing ratio of hot water and water, which is movably installed in the axial direction using the inner wall of the housing as a sliding guide surface, and one end surface in the axial direction of the valve body on the water inlet side. , A hot water valve seat facing the other end surface of the valve body in the axial direction on the hot water inlet side, a mixed water outlet provided on the downstream side of the hot water valve seat, and the mixed water. A temperature-sensitive body spring made of a shape memory alloy for urging the valve body in a direction of decreasing the proportion of hot water as the temperature rises; and a bias spring for urging the valve body in a direction opposite to the temperature-sensitive body spring. , Electricity for adjusting the mixing temperature by varying the biasing force of at least one of the two springs The biasing force adjusting means and the electrical biasing force adjusting means are composed of a motor having an output shaft having a shaft seal member mounting groove and a feed screw, and a spring receiving member screwed to the feed screw. .

[0027]

According to the present invention, according to the above-mentioned structure, the substantially cylindrical valve element is slidably moved in the axial direction to the position where the biasing force of the temperature sensitive body spring and the biasing force of the bias spring are balanced, and is set by the biasing force adjusting means. It reaches the mixed water temperature. At this time, the elastic seal member provided on the outer peripheral surface of the substantially cylindrical valve body is held by the holding groove on the inner wall of the housing, and the sliding groove on the outer peripheral surface of the valve body slides on the elastic seal member. While moving relative. Here, the outer diameter portion of the valve body slides to such an extent that it slightly contacts the sliding guide surface that is the inner wall of the housing, the sliding friction force is small, and the sliding groove of the valve body that slides with the elastic seal member. Is smaller than the outer diameter of the valve body, the sliding contact surface is accordingly thin and small, and the sliding frictional force with this elastic seal member is also small. Therefore, the valve body can be driven with a small biasing force for both the temperature sensing body spring and the bias spring. From this,
The temperature sensitive body spring and the bias spring are thin and small springs, which have a small heat capacity and act so as to have a fast thermal response speed with respect to a temperature change, and can make the hot and cold water mixing apparatus small and compact.

Further, since the valve body is made of tetrafluoroethylene resin or a resin blended with tetrafluoroethylene, or ultrahigh molecular weight polyethylene resin or resin blended with ultrahigh molecular polyethylene, sliding friction between the elastic seal member and the valve body is achieved. Both the force and the sliding frictional force between the sliding guide surface of the inner wall of the housing and the valve body are reduced. Moreover, the effect of shutting off the end face of the valve body from the water valve seat and the hot water valve seat is also enhanced. Moreover, unlike low friction material coating, it has high durability and reliability. Particularly, the temperature sensitive body spring and the bias spring can be made thin and small, the response of the automatic temperature control can be made fast, and the hot and cold water mixing apparatus can be made compact and light and easy to operate.

Further, since the elastic seal member is composed of an O-ring and the holding groove is formed in an arcuate cross section, when the difference between the supply pressures of hot water and water is large, the O-ring has an arcuate shape of the holding groove due to the difference. It works as if it were pressed against the end.
As a result, even if the gap between the holding groove of the housing and the sliding groove of the valve body is slightly larger than the thickness of the O-ring, sealing is performed. In this case, even if the squeezing margin of the O-ring is zero, the O-ring is pressed against the arcuate end of the holding groove and sealed in accordance with the pressure difference. Since the O-ring, which is an elastic seal member, has zero crushing margin, the sliding frictional force with the valve body is also small. Therefore, the sliding property and the sealing property between the valve body and the elastic seal member are excellent without requiring dimensional accuracy, the temperature sensing body spring and the bias spring can be made thin and small, and the response of the automatic temperature control can be made fast, and The mixing device is compact and light and easy to operate.

When the supply water pressure suddenly rises or the water flow rate suddenly increases, the flow velocity of water passing through the gap between the valve body and the water valve seat becomes rapid. At this time, if the width of the parallel facing surfaces of the gap between the valve body and the water valve seat is large, the valve body is suddenly drawn to the water valve seat because the facing area of the portion where the flow velocity is fast and the pressure is low is large. It works as it is and collides with the water valve seat.
By the reaction, the valve body is pushed back and collides with the hot water valve seat this time. So-called valve vibration in which such a state is repeated may occur due to the small sliding resistance of the valve body.
Therefore, the valve body is provided with a chamfer on the surface facing the water valve seat and the hot water valve seat, and the width of the parallel facing surface of the gap between the valve body and the water valve seat and the hot water valve seat is set to 1 mm or less. As a result, even if there is a sudden change in the supply pressure or flow rate, the width of the parallel facing surfaces of the valve body and the valve seat is small, so the facing area of the portion where the flow velocity is fast and low becomes small, It can be prevented that the water is suddenly sucked up by the water valve seat or the hot water valve seat and is operated as if it were.

That is, in the hot and cold water mixing apparatus having a good sliding property of the valve body, valve vibration and temperature hunting due to the vibration can be prevented.

Further, for example, when the supply water pressure at the water inlet fluctuates due to opening / closing of another plug, etc., and the supply water pressure rises, the water pressure in the sliding groove of the valve body also rises, and the elastic seal member is held by the housing. Therefore, the water pressure in the sliding groove acts to urge the valve element toward the water valve seat. Since the flow velocity between the valve body and the water valve seat is fast and the flow velocity in the sliding groove is slow, the pressure between the valve body and the water valve seat is lower than the pressure in the sliding groove even according to Bernoulli's theorem. Therefore, if the supply water pressure rises, the force that urges the valve body toward the water valve seat side increases, and if the supply water pressure decreases, the force that urges the valve body toward the water valve seat side decreases.
This also works on the hot side. That is, the housing is provided with a holding groove for holding the elastic seal member, and the valve body is provided with a sliding groove, so that the opening degree of the valve body is automatically adjusted so as to cancel the influence of supply pressure fluctuations on both the hot water side and the water side. It has the function to be corrected. When the pressures of the water inlet and the hot water inlet are compared here, in most cases, the water inlet is higher. Because it is supplied to the hot water inlet via a water heater, etc.
The pressure loss becomes a low supply pressure. Therefore, the pressure-receiving area that acts when correcting the supply pressure fluctuations described above becomes smaller on the water side and acts on the same level as the hot water side.

That is, by making the outer diameter of the valve body smaller on the water valve seat side than on the sliding groove than on the hot water valve seat side, it is more accurate and stable against fluctuations in the supply pressure. It is possible to provide a hot and cold water mixing device capable of controlling the temperature.

Further, the substantially cylindrical valve element slides in the axial direction at a position where the biasing force of the temperature sensitive body spring and the biasing force of the bias spring are balanced, and the mixing according to the biasing force by the electrical biasing force adjusting means. The water temperature is reached. At this time, the elastic seal member provided on the outer peripheral surface of the substantially cylindrical valve body is held by the holding groove on the inner wall of the housing, and the sliding groove on the outer peripheral surface of the valve body slides on the elastic seal member. While moving relative. here,
The outer diameter of the valve body slides to the extent that it makes light contact with the sliding guide surface that is the inner wall of the housing, and this sliding frictional force is small.
Further, since the sliding groove of the valve body that slides on the elastic seal member is thinner than the outer diameter of the valve body, the sliding contact surface becomes thinner and smaller, and the sliding friction force with the elastic seal member is also smaller. Therefore, the valve body can be driven with a small biasing force for both the temperature sensing body spring and the bias spring, and the mixed temperature control with high speed response can be performed by the electrical biasing force adjusting means with a small driving force.
Moreover, the electronic control means controls the electric biasing force adjusting means based on the temperature detected by the temperature detecting means and the target value set by the temperature setting means, so that stable temperature control can be performed.

Further, the substantially cylindrical valve element slides axially in a position where the biasing force of the temperature-sensitive body spring of the shape memory alloy and the biasing force of the bias spring are balanced, and the output shaft is provided with a shaft seal member mounting groove and The temperature of the mixed water is set by the electric urging force adjusting means including a motor provided with a feed screw and a spring bearing member screwed to the feed screw. At this time, the elastic seal member provided on the outer peripheral surface of the substantially cylindrical valve body is held by the holding groove on the inner wall of the housing, and the sliding groove on the outer peripheral surface of the valve body slides on the elastic seal member. While moving relative. Here, the outer diameter portion of the valve body slides to such an extent that it slightly contacts the sliding guide surface that is the inner wall of the housing, the sliding friction force is small, and the sliding groove of the valve body that slides with the elastic seal member. Is smaller than the outer diameter of the valve body, the sliding contact surface is accordingly thin and small, and the sliding frictional force with this elastic seal member is also small.
Therefore, both the thin and small shape memory alloy temperature sensitive body spring and the bias spring can drive the valve element with a small biasing force, and the motor with a small driving force can control the mixing temperature. Further, since the temperature-sensitive spring is a thin and small shape memory alloy, it has a small heat capacity and a fast thermal response speed with respect to temperature changes, and stable temperature control can be performed. Further, in addition to a small motor and a small spring, the output shaft of the motor is provided with the shaft seal member mounting groove and the feed screw, so that it is possible to provide a compact, compact and inexpensive hot and cold water mixing apparatus that has never been seen before.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to a first embodiment of the present invention. In the drawing, a water inlet 12 and a hot water inlet 13 are provided on the peripheral wall of the housing 11 at intervals in the axial direction, and these inlets 12,
A mixed water outlet 14 is opened on the downstream side communicating with 13. The water inlet 12 is a water chamber 15 in the body of the hot and cold water mixing device.
Similarly, the hot water inlet 13 and the mixed water outlet 14 respectively communicate with the hot water chamber 16 and the mixing chamber 17, and the mixed water reaches the mixed water outlet 14 via the mixing chamber 17.

Inside the housing 11, a water inlet 12
Side and hot water inlet 13 side are provided with a water valve seat 18 and a hot water valve seat 19, respectively. Between the water valve seat 18 and the hot water valve seat 19, a substantially cylindrical valve body 20 that is movable in the axial direction and adjusts the mixing ratio of hot water and water is incorporated.

Further, the temperature-sensing body spring 21 for urging the valve body 20 in the direction of decreasing the proportion of hot water as the temperature of the mixed water rises.
And the force of the bias spring 22 that biases the valve body 20 in the direction opposite to that of the temperature sensing body spring 21, the valve body 2
0 is moved and positioned, these two springs 2
The biasing force adjusting means 23 for adjusting the mixing temperature by varying the biasing force of at least one of the first and the second is configured to adjust the bias spring 22 in the embodiment of FIG. That is, when the handle 24 is rotated, the feed screw 25 is rotated, and the movable spring receiver 26 is moved forward and backward in the axial direction.
The urging force of is adjusted.

Further, the holding groove 28 provided in a part of the sliding guide surface 27 for guiding the outside of the valve body 20 by the inner wall of the housing 11 is a concave groove into which the outer periphery of the elastic seal member 29 is fitted, and this holding groove 28 is held. The groove 28 holds the elastic seal member 29 in a fixed position even when the valve body 20 moves in the axial direction.

Further, the sliding groove 30 provided on the outer peripheral surface of the substantially cylindrical valve body 20 has an outer diameter substantially the same as the inner diameter of the elastic seal member 29, and the axis of the valve body 20 extends in the width of the elastic seal member 29. This is a structure having a width including the maximum movement width in the direction. As the temperature sensitive body spring 21, a shape memory alloy spring, a bimetal spring, or the like can be used, and the shape memory alloy spring is particularly preferable in terms of the force generated with respect to temperature change.

The operation of the above structure will be described. Water and hot water are supplied from the water inlet 12 and the hot water inlet 13, respectively, and the gap between the valve body 20 and the water valve seat 18 and the valve body 20 and the hot water valve seat 19 are provided. According to the gap of, the mixture flows into the mixing chamber 31 while being mixed. Temperature sensitive spring 2 provided in the mixing chamber 31
In No. 1, the urging force changes according to the temperature, and the substantially cylindrical valve body 20 slides in the axial direction at a position where the urging forces of the temperature sensing body spring 21 and the bias spring 22 are balanced to adjust the urging force. The mixed water temperature set by the means 23 is reached. At this time, the elastic seal member 29 provided on the outer peripheral surface of the substantially cylindrical valve body 20.
Is held in the holding groove 28 on the inner wall of the housing 11, and the sliding groove 30 on the outer peripheral surface of the valve body 20 is held by the elastic seal member 2.
It moves relative to 9 while sliding. Here, the valve body 20
The outer diameter portion of the sliding guide surface 2 is the inner wall of the housing 11.
The sliding frictional force of the valve body 20 is small enough to make a slight contact with 7, and the sliding groove 30 of the valve body 20 sliding with the elastic seal member 29 is thinner than the outer diameter of the valve body 20. The surface is thin and small, and the sliding frictional force with the elastic seal member 29 is also small. Therefore, both the temperature sensing body spring 21 and the bias spring 22 can drive the valve body 20 with a small biasing force. For this reason, the temperature-sensitive body spring 21 and the bias spring 22 can be thin and small springs, so that the heat capacity is small, and accordingly, the thermosensitive spring operates sensitively and quickly with respect to temperature changes.

Further, the holding groove 28 is formed in the housing 11 and the sliding groove 30 is formed in the valve body 20. In addition to the effect that the sliding frictional force can be reduced while ensuring the sealing property, hot water or water The valve body 20 against fluctuations in the supply pressure
There is a unique effect that the opening degree of can be automatically corrected and the mixing temperature performance can be stabilized. For example, when the supply water pressure at the water inlet 12 fluctuates due to the opening / closing of another plug, the water valve seat 18
If the opening degree of the valve body 20 remains the same, the amount of water flowing into the mixing chamber 31 changes according to the water pressure, the mixing ratio of hot water and water changes, and the mixed water temperature also changes. However, when the supply water pressure rises, the water pressure in the sliding groove 30 of the valve body 20 also rises, and the elastic seal member 29 is fixed to the housing 11, so that the water pressure in the sliding groove 30 causes the water pressure in the valve body 20. It acts so as to urge the valve seat 18 side. Since the flow velocity between the valve body 20 and the water valve seat 18 is fast and the flow velocity in the sliding groove 30 is slow, the valve body 20 and the water valve seat 18 are also found from Bernoulli's theorem.
The pressure between them is lower than the pressure in the sliding groove 30. Therefore, if the supply water pressure rises, the force that urges the valve body 20 toward the water valve seat 18 increases, and if the supply water pressure decreases, the force that urges the valve body 20 toward the water valve seat 18 side increases. Decrease. This also works on the hot side. That is, the valve body 20 is arranged so as to cancel out the influence of the supply pressure fluctuation on both the hot water side and the hot water side.
The opening of is automatically corrected.

That is, the temperature of the mixed water fluctuates, and the temperature is transmitted to the temperature sensing body spring 21, and the original action of moving the valve body 20 by the change of the urging force of the temperature sensing body spring 21 to keep it at the set temperature. Is the correction operation after the temperature change, but the valve body 20 is moved and corrected by the change pressure of the supply pressure before the temperature change occurs, so that the temperature change can be prevented and prevented in advance and stabilized. Temperature performance is obtained.

According to the first embodiment of the present invention, the elastic seal member 29 is provided on a part of the sliding guide surface 27 of the housing 11.
And a holding groove 28 for holding the sliding groove 3 on the outer peripheral surface of the valve body 20.
With the configuration in which 0 is provided, the sliding friction resistance of the valve body 20 can be reduced, and the temperature sensing body spring 21 can be made thin and small. Therefore, the thermal responsiveness is excellent and it is sensitive to fluctuations in the supplied hot water temperature and pressures. It operates quickly and the opening of the valve body 20 is automatically corrected by the fluctuation of the supply pressure, so that a stable mixing temperature can be obtained.

Further, since the forces of the two springs 21 and 22 can be reduced, the handle 24 of the urging force adjusting means 23 can be easily rotated and the operability is light, and a small and compact hot and cold water mixing apparatus can be obtained.

In the embodiment of FIG. 1, the biasing force adjusting means 2
Although the case where the manual handle 24 is used for 3 has been described, the same effect can be obtained not only by such a manual operation but also by an electric driving means such as a motor.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in that the valve element 32 is made of tetrafluoroethylene resin or tetrafluoroethylene-blended resin, or ultra-high molecular weight polyethylene resin or ultra-high-molecular polyethylene blended resin. There is that. 33 and 34
Is a spring bearing ring.

In the above structure, the holding groove 28 is formed in the housing 11 and the sliding groove 30 is formed in the valve body 32, so that the sliding friction force can be reduced while ensuring the sealing property, and the temperature sensing body spring 21 and Similar to the first embodiment, the bias spring 22 can drive the valve element 32 with a small urging force, but the valve element 32 is made of a tetrafluoroethylene resin or a resin containing tetrafluoroethylene, or an ultra-high pressure. The elastic seal member 29 and the valve body 32 are composed of a polyethylene resin containing a high molecular weight polyethylene or a resin containing ultra-high molecular weight polyethylene.
Both the sliding frictional force between the valve body 32 and the sliding guide surface 27 on the inner wall of the housing 11 are further reduced.

In the case where the valve element 32 is made of any of the above resins, the sliding frictional force between the valve element 32 and the elastic seal member 29 is simply reduced, and the temperature sensor spring 21 and the bias spring 22 are small and thin. The heat capacity of the temperature-sensing body spring 21 is small, so that it can operate quickly and sensitively to temperature changes, and since dust and foreign matter in the fluid are less likely to adhere to the valve, it is possible to prevent dust clogging or dust sticking. There is also a unique effect that the occurrence of problems such as malfunctions can be prevented. Among them, tetrafluoroethylene resin has the smallest friction coefficient and is effective. The ultra-high molecular weight polyethylene resin has a small friction coefficient close to that of tetrafluoroethylene resin, can be injection-molded, and is excellent in mass-productivity. Therefore, it is possible to secure stable and quality-free performance. further,
Compared with general resins such as polyacetal resin and polypropylene resin, the abrasion resistance is remarkably excellent, and thus it is possible to prevent a change in performance over many years. By the way, the ultrahigh molecular weight polyethylene resin has an average molecular weight of 3,000,000 or more, which is an order of magnitude higher than ordinary high density polyethylene. It is also a non-toxic material in terms of food hygiene.

Further, since the valve element 32 is made of the above resin, the valve element 32 and the spring receiving rings 33 and 34 are easily slipped, and the temperature sensor spring 21 and the bias spring 22 are provided.
Unnecessary twisting and twisting can be prevented, the valve body 32 can operate more stably, and an excellent temperature control function can be secured.

According to the second embodiment of the present invention, the valve body 32
Is made of tetrafluoroethylene resin or tetrafluoroethylene-blended resin, or ultra-high molecular weight polyethylene resin or ultra-high-molecular polyethylene blended resin, the sliding friction force between the elastic seal member 29 and the valve body 32 and the housing 11 Both of the sliding frictional force between the sliding guide surface 27 of the inner wall and the valve body 32 are reduced. And the valve body 3
The shut-off sealing effect between the end face of No. 2 and the water valve seat 18 and the hot water valve seat 19 is also enhanced. Further, unlike a coating of a low friction material, it has high durability and reliability, and the temperature sensing body spring 21 and the bias spring 22 can be made even smaller and smaller, so that it is compact, has a high response speed of automatic temperature control, and can be operated lightly. Can be provided.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a third embodiment of the present invention. The third embodiment differs from the first embodiment in that the holding groove 36 has an arcuate cross section and the elastic seal member is an O-ring 35.

In the above structure, the holding groove 36 is formed in an arcuate cross section and the elastic seal member is constituted by the O-ring 35. Therefore, even if the difference in the supply pressure of the hot water and the supply pressure of the water is large, the O-ring 35 has the difference in pressure. Urges against the arcuate end of the retaining groove 36. This allows the O-ring 35 to be pressed against the end of the arch-shaped holding groove 36 even when the gap between the holding groove 36 of the housing 11 and the sliding groove 30 of the valve body 20 is slightly larger than the thickness of the O-ring 35. It will be sealed. That is, even when the squeezing margin of the O-ring 35 is zero, the O-ring 35 is pressed against the end portion of the arcuate holding groove 36 in accordance with the differential pressure and is sealed. Since the collapsing margin of the O-ring 35, which is an elastic seal member, is zero, the sliding frictional force with the valve body 20 is also small. Therefore, in particular, the sliding groove 30 and the holding groove 36
Without requiring high dimensional accuracy such as, the sliding property and the sealing property between the valve body 20 and the elastic seal member 35 are both excellent,
The temperature sensor spring 21 and the bias spring 22 can be made thin and small, the response of the automatic temperature control can be made fast, and the hot and cold water mixing apparatus can be made compact and light and easy to operate.

According to the third embodiment of the present invention, the holding groove 3
The cross section of 6 is formed into an arc shape, and the elastic seal member is formed into an O-ring 35.
With this configuration, it is possible to provide a hot and cold water mixing device that is compact and can be operated lightly, because the slidability and sealing performance between the valve body 20 and the elastic seal member 35 can be ensured without particularly requiring dimensional accuracy.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a fourth embodiment of the present invention. The difference between the fourth embodiment and the first embodiment is that the valve body 37 is provided with chamfered portions 38 and 39 on the surfaces facing the water valve seat 18 and the hot water valve seat 19, and the valve body 37 and the water valve seat are provided. 18 and the gap 40, 41 with the hot water valve seat 19
The widths 42 and 43 of the parallel facing surfaces of the above are configured to be 1 mm or less.

In the above structure, for example, when the supply water pressure suddenly rises or the water flow rate sharply increases, the flow velocity of water passing through the gap 39 between the valve body 37 and the water valve seat 18 becomes rapid. At this time, if the width 42 of the parallel facing surfaces of the gap 40 between the valve body 37 and the water valve seat 18 is large, the facing area of the portion where the flow velocity is fast and the pressure is low is large, so that the valve body 37 suddenly opens. Seat 18
The water valve seat 18 is actuated as if it were attracted to the water valve seat 18 and collides with the water valve seat 18. By the reaction, the valve element 37 is pushed back and collides with the hot water valve seat 19 this time. The so-called valve vibration in which such a state is repeated may occur because the sliding resistance of the valve element 37 is small and the valve element 37 easily moves smoothly. Therefore, the valve body 37 is provided with a chamfered portion 3 on the surface facing the water valve seat 18 and the hot water valve seat 19.
8 and 39 are provided, the valve element 37, the water valve seat 18 and the hot water valve seat 1
By configuring the widths 42 and 43 of the parallel facing surfaces of the gap with 9 to be 1 mm or less, even if there is a sudden change in the supply pressure or the flow rate, the valve body 37 and the valve seats 18 and 19 are parallel to each other. Since the widths 42 and 43 of the facing surfaces are small, the facing area of the portion where the flow velocity is fast and the pressure distribution is low is small, and the valve body 37 is suddenly attracted to the water valve seat 18 or the hot water valve seat 19 so that it operates. It can be prevented. Although the chamfered portions 38 and 39 are formed at the ends of the valve body 37 in FIG. 4, similar effects can be obtained when they are formed at the ends of the water valve seat 18 and the hot water valve seat 19.

According to the fourth embodiment of the present invention, valve vibration and temperature hunting due to the valve vibration can be prevented in the hot and cold water mixing apparatus having a slidable valve element.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a fifth embodiment of the present invention. The fifth embodiment differs from the first embodiment in that the valve body 44 has an outer diameter 45 on the water valve seat 18 side from the sliding groove 30 that is smaller than an outer diameter 46 on the hot water valve seat 19 side. Especially.

In the above structure, when the supply water pressure at the water inlet 12 fluctuates due to the opening and closing of another plug, etc., and the supply water pressure rises, the water pressure in the sliding groove 30 of the valve element 44 also rises, and the elastic seal member 29 becomes Since it is held in the housing 11, the water pressure in the sliding groove 30 causes the valve element 44 to move to the water valve seat 1.
It acts to urge it to the 8 side. Valve body 44 and water valve seat 18
Since the flow velocity between and is fast and the flow velocity in the sliding groove 30 is slow, the valve element 44 and the water valve seat 18 are also found from Bernoulli's theorem.
The pressure between and is lower than the pressure in the sliding groove 30. Therefore, if the supply water pressure rises, the force that urges the valve element 44 toward the water valve seat 18 increases, and if the supply water pressure decreases,
The force that urges the valve element 44 toward the water valve seat 18 is reduced. This is the same on the hot water side, and if the supply pressure to the hot water inlet 13 increases, the force that urges the valve element 44 toward the hot water valve seat 19 side increases, and when the hot water supply pressure decreases. The force for urging the valve element 44 toward the hot water valve seat 19 side is reduced. Ie housing 1
1 is provided with a holding groove 28 for holding the elastic seal member 29,
With the configuration in which the sliding groove 30 is provided in the valve body 44, the valve body 44 has a function of automatically correcting the opening degree of the valve body 44 on both the hot water side and the water side so as to cancel the influence of the supply pressure fluctuation. Where the water inlet 12
Comparing with the pressure of the hot water inlet 13, in most cases,
The water inlet 12 is higher. This is because the hot water is supplied to the hot water inlet 13 through a hot water supply device or the like, so that the pressure loss is a low supply pressure. Therefore, by making the pressure receiving area that acts when correcting the above supply pressure fluctuations smaller on the water side, it is possible to make the correction acting force on the water side equal to that on the hot water side. The correction force acts on the valve element 44 in a well-balanced manner, and more stable hot water temperature control can be performed. This action is not only effective against fluctuations in the supply pressure on the hot water side, but also effective when the set temperature is changed or the supplied hot water temperature is changed. This is because, in these cases, the valve element 44 operates such that the mixing ratio of hot water and water inevitably changes, but the flow rate of the hot water and water and the water chamber 15 and the hot water chamber 16 change in accordance with the change of the mixing ratio. Fluid pressure changes. Water chamber 1 at this time
5 and the pressure change width of the hot water chamber 16 are likely to change greatly on the water side because the supply absolute pressure is higher. Therefore, similarly to the case of the supply pressure fluctuation described above, the outer diameter dimension of the valve element 44 is
By configuring the outer diameter 45 on the water valve seat 18 side from the sliding groove 30 to be smaller than the outer diameter 46 on the hot water valve seat 19 side, a corrective force acts on the valve body 44 in a well-balanced manner, resulting in a more stable hot water temperature. You can control.

According to the fifth embodiment of the present invention, the valve body 44
Of the outer diameter of the sliding groove 30 to the outer diameter 45 of the water valve seat 18 side
Since the outer diameter is smaller than the outer diameter 46 on the hot water valve seat 19 side, more stable temperature control can be performed with respect to fluctuations in the supply pressure.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a sectional view of the essential parts of a hot and cold water mixing apparatus according to a sixth embodiment of the present invention.

In the figure, a water inlet 48 and a hot water inlet 49 are provided on the peripheral wall of the housing 47 at intervals in the axial direction.
And a mixed water outlet 50 is provided on the downstream side communicating with the inlets 48 and 49. The water inlet 48 communicates with a water chamber 51 in the body of the hot water mixing apparatus, and similarly, the hot water inlet 49 and the mixed water outlet 50 communicate with a hot water chamber 52 and a mixing chamber 53, respectively, via the mixing chamber 53. The mixed water reaches the mixed water outlet 50. A temperature detecting means 54 for detecting the temperature of the mixed water is provided in the flow path from the mixing chamber 53 to the mixed water outlet 50.

Inside the housing 47, a water inlet 48
Side and hot water inlet 49 side are provided with a water valve seat 55 and a hot water valve seat 56, respectively. Between the water valve seat 55 and the hot water valve seat 56, a substantially cylindrical valve body 57 that is movable in the axial direction and adjusts the mixing ratio of hot water and water is incorporated.
Further, the temperature sensing body spring 58 for urging the valve body 57 in the direction of decreasing the proportion of the hot water as the temperature of the mixed water rises, and the valve body 5 thereof.
The valve body 57 is moved and positioned by the balance of the force with the bias spring 59 that biases the spring 7 in the direction opposite to the temperature-sensing body spring 58, and the biasing force of at least one of the two springs 58 and 59 is applied. The electric biasing force adjusting means 60 for adjusting the mixing temperature by varying the biasing spring 5 is used in the embodiment of FIG.
9 is a configuration for adjusting the direction. That is, when the output shaft 62 of the motor 61, which is the electric biasing force adjusting means 60, is rotated, the screw shaft 63 rotates, and the movable spring receiver 64 moves back and forth in the axial direction, so that the biasing force of the bias spring 59 is adjusted. .

Further, the holding groove 66 provided in a part of the sliding guide surface 65 for guiding the outer side of the valve body 57 by the inner wall of the housing 47 is a concave groove into which the outer periphery of the elastic seal member 67 is fitted, and this holding groove 66 is held. The groove 66 keeps the elastic seal member 67 in a fixed position even when the valve body 57 moves in the axial direction.

Further, the sliding groove 68 provided on the outer peripheral surface of the substantially cylindrical valve body 57 has an outer diameter substantially the same as the inner diameter of the elastic seal member 67, and the width of the elastic seal member 67 corresponds to the axis of the valve body 57. This is a structure having a width including the maximum movement width in the direction. As the temperature-sensitive body spring 58, a shape memory alloy spring, a bimetal spring, or the like can be used, and in particular, the shape memory alloy spring is preferable from the viewpoint of the force generated by temperature change.

Furthermore, the temperature setting means 69 for setting the target value of the mixed water temperature, and the electric biasing force adjusting means 60 based on the temperature detected by the temperature detecting means 54 and the target value set by the temperature setting means 69. And an electronic control unit 70 for controlling the.

In the above structure, water and hot water are supplied from the water inlet 48 and the hot water inlet 49, respectively, depending on the gap between the valve body 57 and the water valve seat 55 and the gap between the valve body 57 and the hot water valve seat 56. And flows into the mixing chamber 53 while being mixed. The urging force of the temperature sensitive body spring 58 provided in the mixing chamber 53 changes according to the temperature, and the substantially cylindrical valve body 57 is provided at a position where the urging forces of the temperature sensitive body spring 58 and the bias spring 59 are balanced. The temperature of the mixed water moves in the axial direction and reaches the temperature of the mixed water according to the biasing force of the bias spring 59, which is determined by the position of the movable spring receiver 64 being changed by the electric biasing force adjusting means 60. At this time, the elastic seal member 67 provided on the outer peripheral surface of the substantially cylindrical valve body 57 is held by the holding groove 66 on the inner wall of the housing 47, and the sliding groove 68 on the outer peripheral surface of the valve body 57 is elastic. It moves relative to the seal member 67 while sliding. Here, the outer diameter portion of the valve body 57 slides to such an extent that the sliding guide surface 65, which is the inner wall of the housing 47, is lightly contacted, the sliding friction force is small, and the valve body slides on the elastic seal member 67. Since the sliding groove 68 of 57 is thinner than the outer diameter of the valve body 57, the sliding contact surface becomes thinner and smaller, and the sliding frictional force with the elastic seal member 67 is also smaller. Therefore, the valve body 57 can be driven with a small biasing force for both the temperature sensing body spring 58 and the bias spring 59. Because of this, the temperature-sensitive body spring 58 and the bias spring 59 can be thin and small springs, so that the heat capacity is small, and accordingly, the temperature sensitive spring operates sensitively and quickly.

Further, the holding groove 66 is formed in the housing 47 and the sliding groove 68 is formed in the valve body 57. In addition to the effect of reducing the sliding frictional force while ensuring the sealing property, the hot water or water The valve body 57 is adapted to the fluctuation of the supply pressure.
There is a unique effect that the opening degree of can be automatically corrected and the mixing temperature performance can be stabilized. For example, when the supply water pressure at the water inlet 48 fluctuates due to the opening / closing of another plug, the water valve seat 55
If the opening degree of the valve body 57 remains unchanged, the amount of water flowing into the mixing chamber 53 changes depending on the water pressure, the mixing ratio of hot water and water changes, and the temperature of the mixed water also changes. However, when the supply water pressure rises, the water pressure inside the sliding groove 68 of the valve body 57 also rises, and the elastic seal member 67 is fixed to the housing 47. It acts so as to urge the valve seat 55 side. Since the flow velocity between the valve body 57 and the water valve seat 55 is fast and the flow velocity in the sliding groove 68 is slow, the valve body 57 and the water valve seat 55 are also found from Bernoulli's theorem.
The pressure between them is lower than the pressure in the sliding groove 68. Therefore, if the supply water pressure rises, the force that urges the valve body 57 toward the water valve seat 55 side increases, and if the supply water pressure decreases, the force that urges the valve body 57 toward the water valve seat 55 side increases. Decrease. This also works on the hot side. That is, the valve body 57 is arranged so as to cancel the influence of the supply pressure fluctuation on both the hot water side and the hot water side.
The opening of is automatically corrected.

That is, the temperature of the mixed water fluctuates and the temperature is transmitted to the temperature sensing body spring 58, and the original action of moving the valve body 57 by the change in the urging force of the temperature sensing body spring 58 to keep it at the set temperature. In contrast to the correction operation after the temperature fluctuation, the valve body 57 is moved and corrected by the fluctuation pressure of the supply pressure before the temperature fluctuation occurs, so that the temperature fluctuation can be suppressed and prevented in advance.

Further, even if a temperature shift occurs due to the hysteresis of the temperature sensing body spring 58 or a slight sliding friction of the valve body 57, the temperature detection means 54 detects the temperature of the mixed water and the electronic control means 70 is detected. The electric control means 70 is fed back, and compared with the temperature set by the temperature setting means 69, the electric urging force adjusting means 60 is in a direction to eliminate the deviation.
Because of the configuration for controlling the temperature, stable temperature performance can be obtained in which there is very little temperature deviation with respect to the temperature set by the temperature setting means 69, so-called temperature offset.

Moreover, since the sliding frictional force of the valve body 57 is small as described above, the temperature-sensitive body spring 58 and the bias spring 59 can be made thin and have a small biasing force, so that the electric biasing force adjusting means 60 is driven. The force can be reduced, and for example, a minute low torque motor can be realized.

According to the sixth embodiment of the present invention, the valve body 57 can be driven with a small biasing force for both the temperature sensing body spring 58 and the bias spring 59, and the electrical biasing force adjusting means 60 with a small driving force. Can control the mixing temperature with high-speed response.
In addition, the electronic control means 70 controls the electric biasing force adjusting means 60 based on the temperature detected by the temperature detecting means 54 and the target value set by the temperature setting means 69, so that stable temperature control can be performed.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 7 is a sectional view of a hot and cold water mixing apparatus according to a seventh embodiment of the present invention. The seventh embodiment differs from the first embodiment in that a temperature-sensitive body spring 71 made of a shape memory alloy that urges the valve body 20 in a direction to decrease the proportion of hot water as the temperature of the mixed water rises. , Electric biasing force adjusting means 72 for varying the biasing force of at least one of the bias spring 22 for biasing the valve body 20 in the direction opposite to the temperature sensing body spring 71 to adjust the mixing temperature, and the electrical biasing force thereof. The adjusting means 72 uses the output shaft 7
3 is provided with a motor 76 having a shaft seal member mounting groove 74 and a feed screw 75, and a spring receiving member 26 screwed to the feed screw 75.

In the above structure, the substantially cylindrical valve body 20 slides in the axial direction to a position where the temperature-sensitive body spring 71 of the shape memory alloy and the biasing force of the bias spring 22 are balanced.
The output shaft 73 has a shaft seal member mounting groove 74 and a feed screw 7.
An electric urging force adjusting means 72 including a motor 76 having a number 5 and a spring receiving member 26 screwed to a feed screw 75 thereof.
It becomes the mixed water temperature set in. At this time, the elastic seal member 29 provided on the outer peripheral surface of the substantially cylindrical valve body 20 is held by the holding groove 28 on the inner wall of the housing 11, and the sliding groove 30 on the outer peripheral surface of the valve body 20 is elastic. It moves relative to the seal member 29 while sliding. Here, the outer diameter portion of the valve body 20 slides to such an extent that the sliding guide surface 27, which is the inner wall of the housing 11, is lightly contacted, the sliding frictional force is small, and the valve body slides on the elastic seal member 29. 20 sliding groove 30
Is smaller than the outer diameter of the valve body 20, the sliding contact surface is accordingly thin and small, and the sliding frictional force with the elastic seal member 29 is also small. Therefore, the valve body 20 can be driven with a small biasing force for both the thin and small shape memory alloy temperature sensitive body spring 71 and the bias spring 22, and the mixing temperature can be controlled by the motor 76 with a small driving force. Further, since the temperature-sensitive body spring 71 is made of a thin and small shape memory alloy, the heat capacity is small and the thermal response speed is fast with respect to the temperature change and stable temperature control can be performed. In addition to the small motor 76 and the small spring, the shaft seal member mounting groove 74 is formed on the output shaft 73 of the motor 76.
6 and the feed screw 75, for example, as shown in FIG.
As compared with the configuration in which the screw shaft 63 is attached to the output shaft 62 of the motor 61 as described above, the number of parts and the number of assembling steps can be reduced, and further, a compact and compact hot water mixing apparatus that has never been provided can be provided. .

According to the seventh embodiment of the present invention, the drive control can be performed by the thin and small shape memory alloy spring 71 and the small motor 76, and an inexpensive and compact hot and cold water mixing apparatus can be provided.

[0077]

As described above, the hot and cold water mixing apparatus of the present invention is
With a holding groove that holds the elastic seal member on a part of the sliding guide surface of the housing and a sliding groove on the outer peripheral surface of the valve body, the sliding friction resistance of the valve body can be reduced, and the temperature sensor is thin and small. Since it can be used as a spring, it has excellent thermal responsiveness, operates quickly and sensitively to fluctuations in the supplied water temperature and pressure, and the opening of the valve element is automatically corrected by fluctuations in the supply pressure. A stable mixing temperature can be obtained.

Further, since the valve body is made of tetrafluoroethylene resin or tetrafluoroethylene-blended resin, or ultra-high molecular weight polyethylene resin or ultra-high-molecular polyethylene blended resin, sliding friction between the elastic seal member and the valve body is achieved. Both the force and the sliding frictional force between the sliding guide surface of the inner wall of the housing and the valve body are reduced, and the shut-off sealing effect between the end face of the valve body and the water valve seat and the hot water valve seat is also high. Unlike coating, etc., it has high durability and reliability, and since the temperature sensor spring and bias spring can be made even smaller and smaller, it is compact, and the response speed of automatic temperature control is fast,
It is possible to provide a hot and cold water mixing device that can be operated lightly.

Further, since the holding groove is formed in an arcuate cross section and the elastic seal member is constituted by an O-ring, the slidability and the sealability between the valve body and the elastic seal member are ensured without requiring dimensional accuracy. It is possible to provide a compact, inexpensive hot and cold water mixing apparatus.

Further, the valve body is provided with a chamfer on the surface facing the water valve seat and the hot water valve seat, and the width of the parallel facing surface of the gap between the valve body and the water valve seat and the hot water valve seat is set to 1 mm or less. By virtue of the constitution, the above-mentioned effect due to the good slidability of the valve body can be obtained, and valve vibration and temperature hunting due to it can be prevented.

Further, since the outer diameter of the valve body on the water valve seat side of the sliding groove is smaller than the outer diameter of the hot water valve seat side, temperature control can be performed more accurately and stably against fluctuations in the supply pressure. .

Further, a holding groove for holding the elastic seal member is provided on a part of the sliding guide surface of the housing, and a sliding groove is provided on the outer peripheral surface of the valve body, so that the temperature detected by the temperature detecting means and the temperature setting means are used. Since the electronic control means controls the electric biasing force adjusting means on the basis of the set target value, the electric biasing force adjusting means with a small driving force can be used for control, and the temperature can be stably controlled with high speed.

Further, at least one of a temperature-sensitive body spring made of a shape memory alloy for urging the valve element and a bias spring urging in the opposite direction to the temperature-sensitive body spring is electrically connected to adjust the mixing temperature. Since the force adjusting means and the electric force adjusting means are constituted by the motor having the shaft seal member mounting groove and the feed screw on the output shaft and the spring bearing member screwed to the feed screw, the force adjusting means is thin and small. A memory alloy spring and a small motor can be used for drive control, and an inexpensive and compact hot and cold water mixing device can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a third embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view of a hot and cold water mixing apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a cross section of a main part of a hot and cold water mixing apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a hot and cold water mixing apparatus according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a conventional hot and cold water mixing device.

FIG. 9 is a partially enlarged cross-sectional view of a conventional hot water mixing device.

FIG. 10 is a partially enlarged cross-sectional view of a conventional hot water mixing device.

[Explanation of symbols]

 11 Housing 12 Water Inlet 13 Hot Water Inlet 14 Mixed Water Outlet 18 Water Valve Seat 19 Hot Water Valve Seat 20 Valve Body 21 Temperature Sensitive Spring 22 Bias Spring 23 Biasing Force Adjusting Means 27 Sliding Guide Surface 28 Holding Groove 29 Elastic Seal Member 30 Sliding groove 32 Valve body 35 O-ring 36 Holding groove 37 Valve body 38 Chamfering section 39 Chamfering section 44 Valve body 54 Temperature detecting means 60 Electric biasing force adjusting means 69 Temperature setting means 70 Electronic control means 71 Thermosensitive spring 72 Electric Biasing force adjusting means 73 output shaft 74 shaft seal member mounting groove 75 feed screw 76 motor

Claims (7)

[Claims] 1. A housing in which a water inlet and a hot water inlet are opened in a peripheral wall with an axial interval therebetween, and an inner wall of the housing between the water inlet and the hot water inlet is a sliding guide surface in the axial direction. A substantially cylindrical valve body for adjusting the mixing ratio of hot water and water, a water valve seat facing the one end face in the axial direction of the valve body at the water inlet side, and the hot water inlet side In the hot water valve seat facing the other end surface of the valve body in the axial direction, the mixed water outlet provided on the downstream side of the water valve seat, and in the direction of decreasing the proportion of the hot water as the temperature of the mixed water increases. A temperature-sensitive body spring for urging the valve body, a bias spring for urging the valve body in a direction opposite to the temperature-sensitive body spring, and an urging force of at least one of the two springs are varied to adjust the mixing temperature. Urging force adjusting means and an elastic seal member provided on a part of the sliding guide surface. A holding groove for lifting, hot and cold water mixing device comprising a sliding groove that slides relative to the elastic sealing member provided on the outer circumferential surface of the substantially cylindrical the valve body. 2. The hot and cold water mixing apparatus according to claim 1, wherein the valve element is made of tetrafluoroethylene resin or tetrafluoroethylene-blended resin, or ultra-high molecular weight polyethylene resin or ultra-high-molecular polyethylene blended resin. 3. The hot and cold water mixing apparatus according to claim 1, wherein the holding groove is formed in an arcuate cross section, and the elastic seal member is constituted by an O-ring. 4. The valve body is provided with a chamfer on the surface facing the water valve seat and the hot water valve seat, and the width of the parallel facing surface of the gap between the valve body and the water valve seat and the hot water valve seat is 1 mm or less. The hot and cold water mixing apparatus according to claim 1, wherein the hot and cold water mixing apparatus is configured as described above. 5. The hot and cold water mixing apparatus according to claim 1, wherein the valve body is configured such that the outer diameter on the water valve seat side of the sliding groove is smaller than the outer diameter on the hot water valve seat side. 6. A housing in which a water inlet and a hot water inlet are axially spaced apart from each other on a peripheral wall, and an inner wall of the housing between the water inlet and the hot water inlet is a sliding guide surface in the axial direction. A substantially cylindrical valve body for adjusting the mixing ratio of hot water and water, a water valve seat facing the one end face in the axial direction of the valve body at the water inlet side, and the hot water inlet side In the hot water valve seat facing the other end surface of the valve body in the axial direction, the mixed water outlet provided on the downstream side of the water valve seat, and in the direction of decreasing the proportion of the hot water as the temperature of the mixed water increases. A temperature-sensitive body spring for urging the valve body, a bias spring for urging the valve body in a direction opposite to the temperature-sensitive body spring, and an urging force of at least one of the two springs are varied to adjust the mixing temperature. Electric biasing force adjusting means and an elastic seal provided on a part of the sliding guide surface. A holding groove for holding the material, a sliding groove provided on the outer peripheral surface of the substantially cylindrical valve body for sliding with respect to the elastic seal member, a temperature detecting means for detecting the temperature of the mixed water, Temperature setting means for setting a target value of the water temperature, electronic control means for controlling the electric biasing force adjusting means based on the temperature detected by the temperature detecting means and the target value set by the temperature setting means A hot and cold water mixing device. 7. A housing in which a water inlet and a hot water inlet are axially spaced from each other on a peripheral wall and an inner wall of the housing between the water inlet and the hot water inlet is a sliding guide surface in the axial direction. A substantially cylindrical valve body for adjusting the mixing ratio of hot water and water, a water valve seat facing the one end face in the axial direction of the valve body at the water inlet side, and the hot water inlet side In the hot water valve seat facing the other end surface of the valve body in the axial direction, the mixed water outlet provided on the downstream side of the water valve seat, and in the direction of decreasing the proportion of the hot water as the temperature of the mixed water increases. A temperature-sensitive body spring made of a shape memory alloy for urging the valve body, a bias spring for urging the valve body in a direction opposite to the temperature-sensitive body spring, and an urging force of at least one of the two springs are variable. Electric biasing force adjusting means for adjusting the mixing temperature, and the electric biasing force adjusting means. It is hot and cold water mixing device comprising a motor having a shaft sealing member fitting groove and the feed screw to the output shaft, a spring receiving the member is screwed to the feed screw.