JPH09137877A - Thermostat for mixing valve for water combination faucet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothen a water flow and prevent the occurrence of pulsation even when a pressure difference between water and hot water is high by a method wherein a sheet metal fitting to close one end side of the cylindrical body of a thermostat forms a taper surface the diameter of which is decreased along the direction of a flow passage. SOLUTION: At a mixing valve for water combination faucet, water and hot water flowing in a housing 10 through a water inflow port 11 and a hot water inflow port 12 are mixed in a mixing chamber. A temperature-sensitive expansion contraction substance 15 retracts a protrusion 15a at a tip according to the sensing temperature of mixture water in the mixing chamber. By effecting fine adjustment of the position in an axial direction of a spool valve 16, automatic regulation to a set temperature is effected. In a thermostat 22, the shape of a sheet metal fitting 13 forms a taper surface 23 having diameter which is decreased along the direction of a flow passage. This constitution forms a flow passage for water formed by using the taper surface 23 and the inner peripheral surface of the spool valve 16 in such a manner to gradually spread. Thereby, even when a pressure difference between a feed pressure of water and a feed pressure of hot water is high, water smoothly flows and the feed pressure thereof exercises no adverse influence on the spool valve 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents pulsation in a hot and cold water mixing faucet with a thermostat in which a water inlet, a hot water inlet and a mixing chamber are formed along the direction of water flowing in the body of the hot and cold water mixing faucet. It is related to the technology to be done.

[0002]

2. Description of the Related Art Normally, as shown in FIG. 2, a hot and cold water mixing faucet is provided with a temperature adjusting handle (hereinafter referred to as a temperature adjusting handle) 2 on the left end side of a tubular faucet body 1. The handle 3 for adjusting the flow rate (hereinafter referred to as the flow rate handle) 3 is attached to the right end side. Further, a thermostat 4 having an automatic temperature control function is mounted inside the faucet body 1, and a flow rate control valve 5 is attached to the tip of the spindle shaft 3a of the flow rate handle 3.

The thermostat 4 is mounted across the water chamber 6, hot water chamber 7 and mixing chamber 8 in the faucet body 1, and the flow rate control valve 5 includes a mixing chamber 8 and an outflow chamber 9. It is installed across between.

As shown in an enlarged view in FIG. 3, the thermostat 4 communicates with a water inlet 11 communicating with a water chamber 6 of the faucet body 1 and a hot water chamber 7 on a side surface of a cylindrical housing 10. A hot water inlet 12 is provided, one end side is closed by a sheet metal fitting 13, and the other end side is an outlet communicating with the mixing chamber 8. A mixing chamber 14 for actually mixing water and hot water is provided on the outlet side.

Thus, in the housing 10, the temperature-sensitive expansion / contraction body 15 and the spool valve 16 integrally connected thereto
2 and a return spring 17 for biasing the temperature-sensitive stretchable body 15 and the spool valve 16 to the left in FIG. The spool valve 16 includes a water inlet 11 and a hot water inlet 1.
It is mounted so as to straddle 2 and operates so as to change the ratio of these opening areas.

In such a hot and cold water mixing faucet, the water and hot water that have flowed into the housing 10 through the water inlet 11 and the hot water inlet 12 are mixed in the mixing chamber 14, and the mixing chamber 8 in the faucet body 1 is mixed. Then, it flows into the outflow chamber 9 through the flow rate control valve 5, and is further discharged from the water discharge pipe 21 or a shower handle (not shown).

The temperature of the hot water is adjusted by operating the temperature adjusting handle 2 and determining the axial positions of the temperature-sensitive stretchable body 15 and the spool valve 16 via the elastic slide mechanism 19 by the spring 18. As a result, the opening area ratio between the water inlet 11 and the hot water inlet 12 is determined, and the mixture is mixed with hot water having a desired temperature in the mixing chamber 14.

The temperature-sensitive expansion / contraction body 15 senses the temperature of the mixed water in the mixing chamber 14 and causes the protrusion 15a at the tip to project or retract according to the sensed temperature, thereby making the axial position of the spool valve 16 small. By adjusting, the temperature of the mixed water is automatically adjusted to the set temperature.

[0009]

By the way, the spring 18 of the elastic slide mechanism 19 incorporated in the thermostat 4 and the return spring 17 are set so that the biasing force of the spring 18 becomes larger.
Normally, the terminal 20 that engages with the protrusion 15a of the temperature-sensitive expansion / contraction body 15 abuts and locks in the spring box, and in that state, the spool valve 1 is biased by the return spring 17 urging force.
6 is urged in the leftward direction in FIGS. 2 and 3 to maintain an equilibrium state so that 6 is located in the middle of both so as to open both the water inlet 11 and the hot water inlet 12.

However, such an equilibrium state becomes stable as the urging force of the return spring 17 becomes larger than the pressure difference between the water supply pressure acting on the spool valve 16 and the hot water supply pressure. The return spring 17
As the force for urging the spool valve 16 in the rightward direction in FIGS. 2 and 3 against the urging force is increased, the imbalance occurs.

This unbalance has a greater effect as the difference between the water supply pressure and the hot water supply pressure increases, and the spool valve 16
In addition, the temperature-sensitive stretchable body 15 has a drawback that it causes hunting (pulsation) and malfunctions, and the water discharged from the water discharge pipe 21 pulsates. This is because as the supply pressure of water becomes higher than the supply pressure of hot water, the water flowing from the water inlet 11 is between the inner peripheral surface of the spool valve 16 and the outer peripheral surface of the temperature-sensitive expandable body 15. A turbulent flow is generated in the flow path of the water formed in step S1, and the water is accumulated, and the water pressure of the accumulated water urges the spool valve 16 to the right in FIGS.
The cause is that the equilibrium state with the return spring 17 of 6 is broken.

[0012]

SUMMARY OF THE INVENTION The present invention has been made by improving the prior art in view of the above-mentioned problems. Even when the pressure difference between the water supply pressure and the hot water supply pressure is large, The present invention is intended to provide a thermostat of a mixing faucet in which a smooth flow of water keeps a spool valve in an equilibrium state and eliminates pulsation.

Therefore, in order to solve the above-mentioned problems, the means of claim 1 adopted by the present invention is such that one end side of the tubular body of the thermostat mounted in the main body of the hot and cold water mixing faucet is closed by the sheet metal fitting. , The other end side is used as an outflow port, and the water inflow port, the hot water inflow port, and the mixing chamber are formed along the direction of the water flowing from the sheet metal fitting side to the outflow side, and the sheet metal fitting is sized along the flow path direction. It is a thermostat for a hot and cold water mixing faucet, characterized in that it has a tapered surface that reduces

According to the second aspect of the present invention,
The flow path of water formed by the tapered surface of the seat fitting and the spool valve that controls the opening areas of the water inlet and the hot water inlet gradually expands toward the downstream side. It is a thermostat of the hot and cold water mixed faucet.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. The same reference numerals as those in the conventional case denote the same members. FIG. 1 is a semi-longitudinal sectional view showing a thermostat 22 of a hot and cold water mixing faucet according to an embodiment of the present invention. As shown in the figure, in the thermostat 22 of this embodiment, the shape of the conventional sheet metal fitting 13 having a flat end surface is a tapered surface 23 whose diameter decreases along the flow path direction.

As a result, the flow path of water formed by the tapered surface 23 and the inner peripheral surface of the spool valve 16 is gradually expanded toward the downstream side (flow path cross-sectional shape). Becomes a trumpet shape toward the downstream side),
The water flowing in from the water inlet 11 is the tapered surface 23.
It will flow smoothly along and will not stay inside. Therefore, even if the pressure difference between the water supply pressure and the hot water supply pressure is large, the smooth flow of water does not adversely affect the spool valve 16. Therefore, the biasing force of the return spring 17 causes the spool valve 16 to operate at an intermediate position between the water inlet 11 and the hot water inlet 12 so as to maintain an equilibrium state, and hunting (pulsation) does not occur.

[0017]

[Table 1]

Table 1 shows the conventional thermostat 4 shown in FIGS. 2 and 3 in which the sheet metal fitting 13 has a flat end surface.
And the thermostat 22 according to the present invention shown in FIG. 1 in which the taper surface 23 is formed on the sheet metal fitting 13, the test results of presence or absence of pulsation are shown.

The test condition is that the water supply pressure is 4 Kgf / c.
m ² , water temperature is 15 ° C., hot water supply pressure is 0.5 Kg
f / cm ² , the temperature of hot water is 80 ° C, and the flow rate is 4
It was set at a rate of 8 liters / minute at 0 ° C. The number of mixed faucets tested was 6 for both the conventional product and the product of the present invention. In the evaluation of the test, ○ means no pulsation and △ means
Indicates a pulsation of 3 to 5 seconds, and x indicates a pulsation of 5 seconds or more.

As is apparent from these test results, in the case of the product of the present invention in which the sheet metal fitting 13 has the tapered surface 23, no pulsation was generated, whereas in the case of the conventional product having a flat end face. In the case of the set temperature of 30 ° C. and the set temperature of 40 ° C. in which the amount of water flowing through the water inlet 11 is large, a large number of pulsations are generated, which clearly shows the superiority of the present invention.

[0021]

As described above, in the present invention,
Since the seat metal fitting that closes one end side of the thermostat is formed with a tapered surface for smoothly guiding the flow of water,
Even if the water supply pressure is extremely higher than the hot water supply pressure, the flow of water will be smooth, and the water will stay in the thermostat and the water pressure of the accumulated water will act to break the equilibrium state of the spool valve. Disappears.

As a result, pulsation does not occur in the spool valve, and it is possible to obtain stable rectified discharge water.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a thermostat of a hot and cold water mixing faucet according to the present invention.

FIG. 2 is a vertical sectional view showing a conventional hot and cold water mixing faucet.

FIG. 3 is a vertical sectional view showing a thermostat of a conventional hot and cold water mixing faucet.

[Explanation of symbols]

1 ... Main body of hot and cold water mixing faucet 6 ... Water chamber 7 ... Hot water chamber 8 ... Mixing chamber 9 ... Outflow chamber 10 ... Thermostat housing 11 ... Water inlet 12 ... Hot water inlet 13 ... Sheet metal fitting 14 ... Thermostat mixing chamber 15 ... Thermosensitive body 16 ... Spool valve 17 ... Return spring 22 ... Thermostat 23 ... Tapered surface of metal fittings

Claims (2)

[Claims] 1. A direction of water flowing from a sheet metal fitting side to an outlet side by closing one end side of a tubular body of a thermostat mounted in a main body of a hot water mixing faucet with a sheet metal fitting and making the other end side an outlet. A thermostat for a hot and cold water mixing faucet, wherein a water inlet, a hot water inlet, and a mixing chamber are formed along the sheet metal, and the sheet metal fitting has a tapered surface whose diameter decreases along the flow path direction. 2. A water passage formed by a tapered surface of the seat fitting and a spool valve for controlling the opening areas of the water inlet and the hot water inlet gradually expands toward the downstream side. A thermostat for a hot and cold water mixing faucet according to claim 1.