JP3740666B2 - Hot and cold water mixing faucet with thermostat - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot water / water mixing faucet equipped with a thermostat in which the discharge temperature of mixed water is automatically adjusted to a set temperature by operation of a thermostat element.
[0002]
[Prior art]
As is well known, a hot water / water mixing faucet with a thermostat provided in a kitchen, bathroom, etc. is provided with a thermostat element that expands and contracts depending on the temperature in an internal mixing flow path, and the mixing valve is moved by expansion and contraction of the thermostat element. By automatically adjusting the opening degree of the mouth and the hot water valve port, the hot water of a desired set temperature is always discharged.
[0003]
[Problems to be solved by the invention]
However, with a conventional hot water mixing faucet with a thermostat, if the water is temporarily stopped while discharging hot water at an appropriate temperature and the water discharge operation is performed again, the temperature of the mixed water rises at the beginning of the water discharge. In other words, a so-called overshoot phenomenon occurs in which hot water is discharged.
That is, since the temperature sensing part of the water valve opening or hot water valve opening and the thermostat element is provided adjacent to each other, the temperature difference between the mixed water around the temperature sensing part and the cold water or hot water around the water valve opening or hot water valve opening. Therefore, convection due to a temperature difference occurs rapidly, and the temperature of the temperature sensitive part may change rapidly.
In addition, a spouting device is provided on the downstream side of the mixing flow path, and there is a considerably large mixing chamber between the temperature sensing portion and the spouting device, and the mixing chamber is generally a water chamber or a hot water chamber. Adjacent and convective water in the mixing chamber is cooled or overheated by heat conduction of the partition wall, and convection is likely to occur. For this reason, the temperature of the inter-temperature part may greatly change during the water stoppage.
If the temperature of the temperature sensing part drops during the water stop in this way, the thermostat element contracts and moves the mixing valve, and the opening of the hot water valve opening may become larger than necessary during the water stop. There was even a risk of scalding when hot water was discharged. Especially in the case of showering, when the re-watering operation was performed to avoid this, the first water discharge had to be discarded and used for a while. It was uneconomical.
[0004]
[Means for Solving the Problems]
The present invention is intended to solve the above-described problem, and the temperature sensing part of the thermostat element is located in the mixing flow path, and the thermostat element expands and contracts according to the temperature of the mixed water. In a hot water / water mixing faucet with a thermostat that automatically adjusts the temperature of the mixed water to a set temperature by moving between the mixing valve and the temperature sensing part. Rutotomoni convection preventing member provided convection preventing member for preventing the convection is characterized in that mixing channel during waterproofing is to be closed. Further, the present invention provides a thermostat element having a temperature sensing portion located in the mixing flow path and expanding and contracting the thermostat element in accordance with the temperature of the mixed water, whereby the mixing valve moves between the water valve port and the hot water valve port for mixing. A hot water mixing faucet with a thermostat that automatically adjusts the temperature of water to a set temperature, and a convection prevention member for preventing convection of accumulated water in the mixing channel downstream of the temperature sensing portion of the mixing channel the provided Rutotomoni convection preventing member is characterized in that downstream of the outlet from the temperature sensing portion of the mixing channel at the time of stopping the water is to be closed. Further, the present invention provides the hot water mixing faucet with a thermostat, wherein the convection preventing member according to claim 1 or 2 is flexible by the flow of the mixed water when discharging water and opens the mixing flow path and elastically when stopping water. The peripheral portion is made of a flexible elastic material that is restored and contacts the inner peripheral wall of the mixing channel. Furthermore, the present invention is the above-described hot water / water mixing faucet with a thermostat, wherein the convection prevention member according to claim 1 or 2 is a valve member biased by a spring, wherein the mixing flow path is opened when water is discharged, and when water is stopped. The mixing channel is blocked. Furthermore, the present invention is the above-described hot water / water mixing faucet with thermostat, wherein the convection preventing member according to any one of claims 1 to 4 is formed of a heat insulating material. Furthermore, the present invention is characterized in that, in the hot water / water mixing faucet with a thermostat, at least a peripheral wall of the mixing flow path where the temperature sensing portion of the thermostat element is located is formed of a heat insulating material.
[0005]
[Action]
The convection prevention member prevents the convection of the staying water in the mixing flow path when the water is stopped, thereby preventing the temperature of the temperature sensing portion of the thermostat element from fluctuating. For this reason, an overshoot is prevented without the hot water valve opening unnecessarily wide during the water stoppage.
[0006]
【Example】
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of the main part of the thermostatic tap with a thermostat, and FIG. 2 shows a cross section taken along line AA. In the figure, 1 is a hot water supply pipe protruding from the bathroom wall surface, and 2 is a water supply pipe. The faucet body 3 is supported by the hot water supply pipe 1 and the water supply pipe 2. In the faucet body 3, a hot water chamber 4 communicating with the hot water supply pipe 1, a water chamber 5 communicating with the water supply pipe 2, and a mixing chamber 6 are defined. 7 is a water discharge handle provided in the center of the front surface of the faucet body 3 for communicating with the mixing chamber 6 and discharging the mixed water in the mixing chamber 6 to the water discharge pipe 8 or the shower connection pipe 9. 8 or a temperature adjusting handle provided at one end of the faucet body 3 so that the temperature of the mixed water discharged from the shower connecting pipe 9 can be adjusted as desired. And a push button 12 for restricting rotation of the temperature control handle 10 in the hot water direction. Reference numeral 13 denotes a mark point for a temperature indicator provided on the outer periphery of one end of the faucet body 3.
[0007]
As shown in FIG. 2, a valve stem 15 is concentrically fixed to the handle shaft 14 of the water discharge handle 7, and a pair of valve bodies 16 and 17 are provided with a coiled spring 18 therebetween. The valve body 16 is disposed in the mixing chamber 6 so as to be interposed, and the valve body 16 is opposed to the valve opening 19 communicating with the water discharge pipe 8, and the valve body 17 is opposed to the valve opening 20 communicating with the shower connecting pipe 9. Therefore, when the water discharge handle 7 is rotated to move the valve rod 15 forward and backward, the valve bodies 16 and 17 are moved in the axial direction, the valve port 19 or the valve port 20 is opened, and the mixed water in the mixing chamber 6 is discharged from the water discharge pipe 8. Alternatively, the water spouting device is configured so that the water can be switched and discharged to the shower connecting pipe 9.
[0008]
Reference numeral 21 denotes a cylindrical bonnet provided in one end of the faucet body 3, and 22 denotes a hollow cylindrical screwing cylinder screwed into the bonnet 21. When the temperature control handle 10 is rotated, The screwing cylinder 22 is rotated in a rotating manner in the bonnet 21 from side to side. A retaining ring 23 is fixed to the inner periphery of the other end of the screwing cylinder 22, and a pressing body 24 is provided in the retaining ring 23 so as to freely advance and retract. Reference numerals 25 and 26 denote pressing springs that urge the pressing body 24.
[0009]
A thermostat element 30 is supported in the center of the faucet body 3 by a thermostat cartridge case 31 and an annular seal material 32 so as to be able to advance and retreat. The thermostat element 30 is filled with wax that expands and contracts depending on temperature. Accordingly, the telescopic shaft 33 moves in and out. The telescopic shaft 33 is loosely fitted in a concave hole 27 formed at the center of the pressing body 24. The thermostat cartridge case 31 is preferably molded from an elastic material such as synthetic resin.
[0010]
A mixing channel 36 is formed in the cylindrical portion 35 located between the water chamber 5 and the mixing chamber 6 of the thermostat cartridge case 31, and the temperature sensing part 34 of the thermostat element 30 is positioned in the mixing channel 36. ing. In addition, an O-ring 40 is provided at an intermediate portion between the hot water chamber 4 and the water chamber 5, and a mixing valve 41 is provided in the O-ring 40 so as to freely advance and retract. As shown in FIGS. 3 and 4, the mixing valve 41 has a lotus root shape cut into a ring shape, and a plurality of water passage holes 43 are formed around the center hole 42. The opening edge 44 of the center hole 42 is chamfered in a funnel shape. 45, an end shaft 49 is loosely fitted in the center hole 42 so that the tapered portion 46 contacts the opening edge 44, and a cap-like portion 47 on the other end is fitted on the base end portion 38 of the thermostat element 30. In the receiving member, a number of obstacle pieces 48 extending radially into the mixing flow path 36 are radially formed on the outer periphery of the end portion of the receiving member 45.
[0011]
A spring seat 50 is provided in the hot water chamber 4, and one end of a coil spring 52 is fitted into and received by a center hole 51 of the spring seat 50. The other end of the coil spring 52 is engaged with an end shaft 49 loosely fitted in the central hole 42 of the mixing valve 41 to urge the mixing valve 41 in the direction of the thermostat element 30.
As shown in FIG. 4, a hot water valve port 55 through which hot water in the hot water chamber 4 can flow into the water hole 43 is formed between the end face of the spring seat 50 and the end edge of the mixing valve 41. A water valve port 56 through which water in the water chamber 5 can flow into the mixing flow path 36 is formed at the other end edge of 41 and the portion of the thermostat cartridge case 35 that faces the water chamber 5. The hot water valve port 55 is expanded and the water valve port 56 is urged. On the contrary, the pressing body 24 elastically presses the mixing valve 41 via the thermostat element 30 by the elasticity of the pressing springs 25 and 26, and the hot water valve. Since the port 55 is urged to narrow and the water valve port 56 is expanded, the mixing valve 41 moves due to the balance of forces in the opposite directions. Therefore, the temperature of the mixed water can be set as desired by rotating the temperature adjustment handle 10. Reference numeral 57 denotes an outlet provided in the thermostat cartridge case 31 for allowing the mixed water flowing through the mixing channel 36 to flow out into the mixing chamber 6.
[0012]
Thus, reference numeral 60 denotes a convection prevention member sandwiched between the end of the thermostat element 30 by the receiving member 45 so as to be positioned between the mixing valve 41 and the temperature sensing part 34. A flexible elastic material such as a synthetic resin sheet is cut into an annular shape and fixed by inserting a base end portion 38 in the center thereof. 4, the convection prevention member 60 is elastically restored at the time of water stoppage, and the peripheral portion comes into contact with the inner peripheral surface of the mixing channel 36 as shown in FIG. The mixing channel 36 is closed. For this reason, the staying water in the mixing flow path 36 is prevented from convection to the water chamber 5 or the hot water chamber 4 due to the temperature difference or the like when the water is stopped.
[0013]
Reference numeral 61 denotes a convection preventing member provided so as to open and close the outflow port 57 on the downstream side of the temperature sensing portion 34 of the mixing channel 36. The convection prevention preventing member 61 is a cylindrical shape that can open and close the outflow port 57. A valve member 62 is slidably provided in the thermostat cartridge case 31 by being urged toward the mixing flow path 36 by a spring 63. For this reason, as shown in FIGS. 1 and 4, when discharging water, the spring 63 contracts due to the flow of the mixed water flowing through the mixing flow path 36 and the outlet 57 is opened. When the water stops, the spring 63 as shown in FIG. Due to this elasticity, the valve member 62 slides to close the outflow port 57, and the staying water in the mixing channel 36 can be prevented from convection through the outflow port 57 to the mixing chamber 6. The valve member 62 is preferably molded from a synthetic resin having elasticity.
[0014]
As described above, the convection preventing member 60 and the convection preventing member 61 prevent the staying water in the mixing flow path 36 from convection to the hot water chamber 4, the water chamber 5, the mixing chamber 6 and the like when the water is stopped. It is possible to prevent the temperature from changing greatly, and to prevent overshooting of the discharge temperature of the mixed water during re-discharge. Further, by forming the convection preventing member 60 and the convection preventing member 61 with a heat insulating material such as a synthetic resin, heat conduction is reduced, and the hot water temperature retaining effect around the temperature sensing portion 34 is improved, so that the water discharge temperature is further stabilized. be able to. Furthermore, as the thermostat cartridge case 31 is formed of a highly heat-insulating synthetic resin, at least the peripheral wall of the mixing channel 36 where the temperature sensing part 34 of the thermostat element 30 is located is formed of a heat insulating material. Therefore, the heat transfer effect around the temperature sensing part 34 can be further improved.
In addition, although the example which used the wax type thermostat element 30 was shown in this Example, in addition to this wax type as a thermostat element, the thing using a shape memory alloy, or the thing using other temperature sensitive bodies may be used. The same applies.
[0015]
【The invention's effect】
As described above, the present invention prevents convection of staying water in the still water around the temperature sensing portion of the thermostat element, thereby preventing overshooting of the hot water temperature during re-watering and improving the usability of the hot water mixing faucet with a thermostat. There are beneficial effects to improve.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional plan view of a hot and cold water mixing tap with a thermostat showing an embodiment of the present invention.
2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an exploded perspective view of a main part of a hot and cold water mixing tap with a thermostat according to the present invention.
FIG. 4 is an enlarged partial cross-sectional front view of a hot and cold water mixing tap with a thermostat showing one embodiment of the present invention.
5 is a state diagram at the time of water discharge of the hot and cold water mixing faucet with thermostat in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply pipe 2 Water supply pipe 3 Water faucet body 4 Hot water chamber 5 Water chamber 6 Mixing chamber 7 Water discharge handle 10 Temperature control handle 30 Thermostat element 31 Thermostat cartridge case 34 Temperature sensing part 36 Mixing flow path 41 Mixing valve 55 Hot water valve port 56 Water Valve port 60 Convection prevention member 61 Convection prevention member 62 Valve member 63 Spring

Claims (6)

The temperature sensing part of the thermostat element is located in the mixing channel, and the thermostat element expands and contracts according to the temperature of the mixed water, so that the mixing valve moves between the water valve port and the hot water valve port to set the temperature of the mixed water in the the mixing valve with a thermostat as automatically adjusted to a temperature, Rutotomoni convective provided convection preventing member for preventing the convection of accumulated water in the mixing channel between said mixing valve the temperature sensing unit A hot water / water mixing faucet with a thermostat, wherein the preventing member is configured to block the mixing flow path when water is stopped . The temperature sensing part of the thermostat element is located in the mixing channel, and the thermostat element expands and contracts according to the temperature of the mixed water, so that the mixing valve moves between the water valve port and the hot water valve port to set the temperature of the mixed water in the the mixing valve with a thermostat as automatically adjusted to temperature, convection preventing member for preventing the convection of accumulated water in the mixing channel該混merging path on a downstream side of the temperature sensing portion of the provided Rutotomoni the A hot water / water mixing faucet with a thermostat, wherein the convection preventing member is configured to block an outlet on the downstream side of the temperature sensing portion of the mixing channel when water stops .   The convection prevention member according to claim 1 or 2 is flexible by the flow of the mixed water at the time of water discharge and opens the mixing flow path, and is restored by elasticity at the time of water stoppage so that the peripheral edge is on the inner peripheral wall of the mixing flow path. A hot and cold water mixing faucet with a thermostat, characterized by being formed of a flexible elastic material that comes into contact.   The convection prevention member according to claim 1 or 2 is a valve member biased by a spring, wherein the mixing channel is opened when water is discharged and the mixing channel is closed when water is stopped. A water tap with a thermostat.   A convection prevention member according to any one of claims 1 to 4, wherein the convection prevention member is formed of a heat insulating material.   The hot water / water mixing faucet with a thermostat according to any one of claims 1 to 5, wherein at least a peripheral wall of a portion of the mixing channel where the temperature sensing portion of the thermostat element is located is formed of a heat insulating material.

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