JPH0633275Y2 - Thermostat mixing valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a thermostat mixing valve having a function of automatically adjusting the temperature of mixed water, and more particularly to a control valve for temperature control.

[Conventional technology]

The thermostat mixing valve responds to the temperature fluctuation of the mixed water due to the fluctuation of the pressure and flow rate of the supplied water and hot water,
It has a function of returning to the set mixed water temperature. FIG. 3 shows a main part of a thermostat mixing valve which has been generally used conventionally.

Inside the main body 1 of the hot and cold water mixing valve, there are formed a water source 2 and a hot water chamber 3 which communicate with the hot water source, respectively, and the control valve A
These chambers are connected to the water discharge passage 4 via. The control valve A has a structure in which a cylindrical valve body 5 is movable in the axial direction thereof, and the valve body 5 is provided with a water valve seat 2a of the water chamber 2 and a hot water chamber 3
It is stored between the hot water valve seat 3a. On the other hand, a temperature-sensitive body 7 and a tubular sleeve 6 whose tip abuts the valve body 5 are provided as the temperature-sensing function section. The temperature sensitive body 7 is one in which wax is enclosed, and the expansion and contraction of this wax causes the pin 7a provided at one end to project and retract, and this operation is utilized to make the control valve A
The valve body 5 can be moved in the axial direction. Pin 7a
Is inserted into a receiving body 11d incorporated in a member on the side of an operating handle (not shown), and the degree of fitting between the pin 7a and the receiving body 11d provides a degree of freedom for changing the position of the sleeve 6.

At the time of water discharge, water flows into the sleeve 6 from the water inflow hole 6a formed in the sleeve 6 and water flows from the hot water inflow hole 5a formed in the valve body 5 to be mixed. And the mixed water is the temperature sensitive body 7.
Flowing out of the sleeve 6 and discharged to the water discharge passage 4 from the outflow hole 6b formed in the sleeve 6. At this time, when the temperature of the mixed water is higher than the set value, the wax in the temperature sensitive body 7 expands and the pin 7a protrudes, and accordingly, the sleeve 6 moves to the left in the figure. Therefore, the valve opening on the side of the hot water valve seat 3a becomes smaller and, at the same time, the side of the water valve seat 2a expands, lowering the temperature of the mixed water to restore the set temperature.

[Problems to be solved by the device]

The control valve A is set by rotating a handle (not shown) that moves the sleeve 6 in the axial direction. When the temperature is set by this handle, the water discharge temperature may suddenly change suddenly and overshoot may occur. This will be described with reference to FIG.

FIG. 6 (a) shows a state before the setting is changed, and both end surfaces of the valve body 5 correspond to the hot water side setting position H and the water side setting position C, respectively.
When the handle is operated to set the temperature to the high temperature side, the sleeve 6 connected to the handle moves to the right as shown in FIG. 6 (b). At this time, the valve body 5 also moves together with the sleeve 6, and the valve body 5 moves with a stroke of the distance L with respect to the hot water side setting position H and the water side setting position before the setting change.

However, after the setting of FIG. 6 (b), the hot mixed water flows around the temperature sensing element 7, so that the expansion of the wax causes the pin to move.
7a will stick out to the right. Therefore, the sleeve 6
Is pushed to the left to move the valve body 5 to the low temperature side. In this way, the valve body 5 is detected by detecting the temperature of the mixed water by the temperature sensing body 7.
In order to control the position of, the amount of protrusion of the pin 7a must be predicted and then the initial stroke L of the valve body 5 must be determined. In other words, as shown in FIG. 6 (c), when the hot water side setting position h and the water side setting position c are the final setting positions, the stroke of the valve body 5 is 1 and the initial stroke is Shorter than L. Then, the valve body 5 corresponding to L-l is moved to the low temperature side by the protrusion of the pin 7a, and finally, the valve opening degree on the water side and the hot water side which matches the set temperature is set.

Thus, when the temperature is set to the high temperature side, it is necessary to allow the sleeve 6 to overstroke in consideration of the amount of protrusion of the pin 7a. Therefore, the state shown in Fig. 6 (b) is passed until the final setting of the valve body 5, and the mixed water higher than the set temperature is discharged in the transition period up to Fig. 6 (c). Will be done. This is the cause of overshoot, and when changing from 30 ° C to 40 ° C, for example, the overshoot may be 60 ° C or more.

Further, since the valve body 5 is generally made of a copper alloy or the like,
The linear expansion coefficient of the valve body 5 is relatively small. Therefore, the change of the outer diameter with respect to the temperature fluctuation of the mixed water is small, and the fitting degree with the inner wall of the main body 1 around the valve body 5 allows the valve body 5 to slide quickly even when the mixed water temperature becomes high. It is kept almost uniform in degree. Therefore, the valve body 5 can freely move within the main body 1 even if it is exposed to a high temperature, easily follow the movement of the sleeve 6 as shown in FIG. 6 (b), and easily cause overshoot. Cause of.

Therefore, an object of the present invention is to prevent overshoot when the mixed water temperature is set to a high temperature side so that it can be used safely.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the thermostat mixing valve of the present invention is equipped with a uniaxial operation type control valve for mixing water and hot water supplied into the main body, and the valve body of the control valve is sensitive to the temperature of the mixed water. A thermostat mixing valve connected to a temperature sensing element, wherein the valve body is slidably inserted into a mounting seat formed inside the main body, and a water valve seat and a hot water formed in the moving direction of the valve body. It is characterized in that the mixing ratio of water and hot water can be set by the valve opening degree between the valve seat and the valve body, and the valve body is made of a synthetic resin material having a larger linear expansion coefficient than the main body.

[Action]

If the valve body is made of a synthetic resin having a large linear expansion coefficient and the fitting degree of the valve body with respect to the mounting seat is set appropriately, the fitting degree becomes stronger due to the expansion of the valve body. For this reason,
When the temperature of the mixed water is raised, the valve body expands and tightly fits into the mounting seat, so the movement of the valve body toward the temperature setting side becomes dull, and there is no overshoot when setting a high temperature.

〔Example〕

Hereinafter, the features of the present invention will be specifically described with reference to the embodiments shown in the drawings.

FIG. 1 is a front longitudinal sectional view of a thermostat mixing valve showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line I--I of FIG. The same members as those shown in the conventional example of FIG. 3 are designated by common reference numerals, and detailed description thereof will be omitted.

In the figure, a water leg pipe 1a and a water leg pipe 1b, which communicate with the water chamber 2 and the hot water chamber 3, are connected to the back of the main body 1, respectively.

A valve body 5 of a control valve A arranged between the water chamber 2 and the hot water chamber 3.
Is provided with a sealing material 8a such as an O-ring on the outer peripheral surface 8 and is slidably incorporated in a mounting seat 9 having an annular cross section formed in the main body 1. The valve body 5 is made of polyacetal having a linear expansion coefficient larger than that of a copper alloy or the like. Further, the valve body 5 is formed in a cylindrical shape, one end of which is opposed to the water valve seat 2a and the other end thereof is opposed to the hot water valve seat 3a. Change at the same time. Also, the valve body 5
Is urged toward the temperature sensitive body 7 by the spring 10 housed in the hot water chamber 3, and the spring 10 holds the valve body 5 movably in the axial direction thereof in conjunction with the operation of the pin 7a which is projected and retracted.

On the other hand, a temperature setting handle 11 is provided at the right end of the main body 1, and a drive shaft 11b having a spindle 11a and a spring 11c built therein.
It is connected to the pin 7a side of the temperature sensitive body 7 via. When the temperature setting handle 11 is rotated, the drive shaft 11b moves in the axial direction, and the temperature sensitive body 7 connected to this moves left and right in FIG. As a result, the valve body 5 moves between the water valve seat 2a and the hot water valve seat 3a, and the valve opening degree of each valve seat 2a, 3a is set to adjust the temperature of the mixed water.

When the temperature of the mixed water shifts to a direction higher than the set temperature, the wax of the temperature sensitive body 7 expands and the pin 7a moves to the right side in FIG. 1, and the reaction force causes the sleeve 6 to move to the left side. For this reason, the valve body 5 also moves to the left, and the valve opening on the side of the hot water valve seat 3a decreases and at the same time the valve opening on the side of the water valve seat 2a increases. Therefore, since the amount of hot water decreases and the amount of water increases, the temperature of the mixed water falls to the set temperature and the automatic temperature control is performed. When the temperature of the mixed water falls below the set temperature, the wax conversely contracts and the pin 7a sinks into the temperature sensitive body 7,
The sleeve 6 moves to the right. As a result, the amount of hot water increases, the amount of water decreases, and the temperature of the mixed water drops to the set value.

Here, when a copper alloy used for a general faucet is used as a material for the valve body 5, the composition of the copper alloy is Cu: 82.0 to 8% by weight.
When 7.0%, Sn, Zn, Pb: 4.0-6.0% and impurities: 2.0% or less, the linear expansion coefficient is about 1.8 × 10 ^-5 / ° C. On the other hand, the coefficient of linear expansion of polyacetal is about 8.1 × 10 ^-5 / ° C, which is larger than that of the case where copper alloy is used as the material.

On the other hand, if the valve body 5 is made of polyacetal and has the same outer diameter as the copper alloy valve body 5 shown in FIG. 3 and is fitted into the mounting seat 9 having the same inner diameter as in FIG. The degree of fit is the same whether it is an alloy or polyacetal. When the valve body 5 is heated and expanded, the polyacetal valve body 5 is tightly fitted to the mounting seat 9 due to the difference in linear expansion coefficient.

In this way, when using polyacetal as the material of the valve body 5,
When the position of the valve body 5 is set so that the temperature of the mixed water becomes high, the valve body 5 expands and the fitting with the mounting seat 9 becomes stronger. Therefore, the free movement of the valve body 5 in the mounting seat 9 is restricted, and it becomes difficult for the valve body 5 to move from the hot water valve seat 3a side to the water valve seat 2a side as the temperature of the mixed water rises. Therefore, in the conventional structure, as shown in FIG. 6, the valve body 5 moves following the movement of the sleeve 6 and then returns to the final set position, whereas the temperature setting handle 11 operates. At this time, the receiving body 11d into which the pin 7a is fitted moves first, and it is possible to set the final setting value without causing the valve body 5 and the sleeve 6 to overshoot.

FIG. 4 shows the movement of the valve body 5 and the sleeve 6 in the present invention, and FIG. 4 (a) shows the state before setting. And
When the temperature is set, only the receiving body 11d is moved by the operation of the temperature setting handle 11 as shown in FIG. 7B, and the valve seat 5 and the sleeve 6 are stopped at the positions before the setting. That is, in the present invention, the valve body 5 does not move as shown in FIG. 6 (b), and the valve body 5 is slowly moved at the time when the movement of the sleeve 6 toward the valve body 5 side due to the protrusion of the pin 7a is completed. It can be moved (Fig. 4 (c)). Therefore, the valve opening on the hot water side does not become excessively large temporarily, and overshoot at the initial temperature setting can be prevented.

FIG. 5 is a graph showing the overshoot in comparison with the conventional example, and shows a situation in which the temperature of the mixed water is set to a high temperature from 40 ° C to 50 ° C. Fig. 5 (b) shows the conventional structure. After setting from 40 ° C to 50 ° C, it overshoots up to 67 ° C at maximum and then returns to the steady state of 50 ° C. FIG. 5 (a) shows the case according to the present invention, in which the temperature rises to about 52 ° C. after setting and then shifts to a steady state of 50 ° C. As described above, the size of the overshoot is remarkably smaller than that of the conventional structure, and hot water of an abnormally high temperature is not discharged even when set to the high temperature side.

[Effect of device]

As described above, in the thermostat mixing valve of the present invention, the valve body of the control valve that changes the mixing ratio of hot water and water is made of synthetic resin having a large linear expansion coefficient instead of the conventional copper alloy. Therefore, when the temperature of the mixed water is raised, the valve body expands and the fitting with the mounting seat becomes tight, so that the valve body can slowly move to the high temperature side setting side and move to the final position. Therefore, compared to the conventional structure in which the valve body is set to the final position after the valve body follows the movement of the temperature sensing element, the overshoot at the initial setting is significantly reduced. Therefore, even when the temperature is set to a high temperature, hot water of an abnormally high temperature is not discharged temporarily, and it can be safely used as a bathtub or a shower.

[Brief description of drawings]

1 is a front longitudinal sectional view of a thermostat mixing valve showing one embodiment of the present invention, FIG. 2 is a sectional view taken along the line I--I of FIG. 1, and FIG. FIG. 4 is a diagram showing the movement of the valve body and the sleeve in the present invention, FIG. 5 is a graph showing a comparison of the overshoot amounts, and FIG. 6 is a movement of the valve body and the sleeve for explaining the occurrence of the overshoot. It is a schematic sectional drawing shown. 1: Main body, 1a: Water leg pipe 1b: Hot water leg pipe, 2: Water chamber 2a: Water valve seat, 3: Hot water chamber 3a: Hot water valve seat, 4: Discharge passage 5: Valve body, 5a: Hot water Inflow hole 6: Sleeve, 6a: Water inflow hole 6b: Outflow hole, 7: Temperature sensor 7a: Pin, 8: Outer peripheral surface 8a: Seal material, 9: Mounting seat 10: Spring, 11: Temperature setting handle 11a: Spindle , 11b: Drive shaft 11c: Spring, 11d: Receiver A: Control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Shou 59-92287 (JP, U) Seki 56-82368 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A thermostat mixing valve comprising a uniaxial operation type control valve for mixing water and hot water supplied into the main body, and a valve body of the control valve being connected to a temperature sensing body sensitive to the temperature of the mixed water. The valve body is slidably inserted into a mounting seat formed inside the main body, and water is generated by the valve opening between the water valve seat and the hot water valve seat formed in the moving direction of the valve body. A thermostat mixing valve, wherein a mixing ratio with hot water can be set and the valve body is made of a synthetic resin material having a coefficient of linear expansion larger than that of the main body.