JPH0610779B2 - Automatic pressure regulator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pressure regulating valve provided immediately before a hot and cold water mixing device or the like used for hot water supply, which equalizes hot water and water having two different pressures.

Configuration of Conventional Example and Problems Thereof A conventional automatic pressure regulating valve of this type is shown in FIG.

As shown in FIG.
There are two pistons 2, 3 and 4, and the fluid sent from the first flow path 5 is decompressed through the center of the piston 2, flows out to the flow path 6, and is sent from the second flow path 7. The coming fluid is
The pressure is reduced through the center of the piston 4 and flows out into the flow path 8. Since the pressure receiving areas of the pistons 2, 3, 4 are equal, the primary pressures of the fluids in the flow paths 5, 7 cancel each other out between the pistons, and the secondary pressure difference of the fluids in the flow paths 6, 8 cancels the pistons. Works. When the secondary pressure becomes equal in the flow paths 6 and 8, the piston stabilizes, and when the other pressure fluctuates, the piston operates in the direction to make it equal, thereby changing the reduction rate of the primary pressure. This is to equalize the secondary pressure. However, such a conventional configuration has the following problems.

(1) There is no sealing material between the fluid shown in Fig. 1 and the second fluid,
Therefore, the two fluids may mix.

(2) Since the gap between the cylinder and the piston is very small, the fluid components will be deposited and the scale is likely to be attached, and the function is likely to be impaired.

In addition, it is easily conceivable from the above-mentioned conventional examples that there is a piston provided with a sealing material, but because the sealing material is provided, sliding resistance occurs and it does not operate for minute pressure fluctuations. Can be considered.

If this type of automatic pressure regulating valve is installed immediately before the hot and cold water mixing tap, the hot and cold water mixing tap cannot handle the minute pressure fluctuations, and there is a high possibility that a large temperature change will occur. Cannot be used.

An object of the present invention is to solve such a conventional problem, to prevent mixing of the first and second fluids, respond sensitively to minute pressure fluctuations, and accurately with respect to a hot and cold water mixing tap. A pressure control valve capable of balancing secondary pressure is provided.

Structure of the Invention In order to achieve this object, the present invention provides a hot water flow path and a water flow path, and hot water and water 1 respectively provided in these two flow paths.
The hot water side valve body for reducing the secondary pressure, the water side valve body, the hot water side piston for balancing the primary pressure of the hot water applied to the hot water side valve body, and the primary pressure of the water applied to the water side valve body A water side piston, a hot water side back pressure chamber provided on the back surface of the hot water side piston to which the secondary pressure is introduced, a water side back pressure chamber provided to the back surface of the hot water side piston to which the secondary pressure is introduced, and hot water Side secondary pressure chamber and water side 2
It has a secondary pressure chamber and a diaphragm that operates at the hot side secondary pressure and the water side secondary pressure after decompression, and the hot side valve body and the water side valve body are connected at this diaphragm portion. With the above configuration, the two valve elements operate in inverse proportion to the change in the pressure balance between the hot water side secondary pressure chamber and the water side secondary pressure chamber, and Regardless of the level of the primary pressure, the secondary pressures on the hot water side and the water side are adjusted to be uniform pressures.

Description of Embodiment An embodiment of the present invention will be described below with reference to FIG.

The hot water side flow path 9 and the water side flow path 10, and the hot water side valve body 11 and the water side valve body 12 provided in these two flow paths for reducing the primary pressure of the hot water and the water, respectively, A hot water side secondary pressure chamber 13 and a water side secondary pressure chamber 14 through which hot water and water that have been depressurized by the valve bodies 11 and 12 pass are provided, and a diaphragm 15 that separates these two secondary pressure chambers is provided. is doing. Here, the diaphragm uses a metal diaphragm. The hot water side valve body 11 and the water side valve body 12 are connected to each other by a diaphragm 15 and are biased by biasing springs 16 and 16 ′, and are symmetrical with respect to the diaphragm 15.

A hot water side piston 11 'is provided in connection with the hot water side valve body 11, and a water side piston 12' is provided in connection with the hot water side valve body 12,
The primary pressures applied to the valve bodies 11 and 12 are balanced so that the pressure adjusting operation is not affected by the primary pressure of hot water. In addition, the hot water piston 11 'and the hot water piston 12'
A backside pressure chamber 17 for hot water and a backpressure chamber 18 for water are provided on the back surface of the hot water, and a secondary pressure of hot water and water is introduced into these back pressure chambers 17 and 18 through introduction holes. Side valve body 11 and water side valve body 1
2 is well balanced against the secondary pressure of hot and cold water, and is configured to operate only by the secondary pressure of hot water and water acting on the diaphragm 15.

The pressure receiving area of the diaphragm 15 is set to be larger than that of the hot water valve body 11 and the hot water valve body 12, and the piston portion is limited when the secondary pressure on the hot water side and the hot water side acts as in the conventional case. Then, even a slight change in the secondary pressure can be detected sharply to enable highly accurate pressure adjustment.

Further, since the partition between the hot water side and the water side is constituted by the diaphragm 15, malfunctions due to scale adhesion as in the past, and rise in water temperature due to leakage from the side with high pressure of hot water to the side with low pressure, It is possible to prevent a decrease in hot water temperature. Further, even if dust is caught in the pistons 11 'and 12', the pressure receiving area of the diaphragm 15 is set larger than that of the hot water valve body 11 and the water valve body 12, so that the acting force is largely released. Is easy.

With the above configuration, the hot water and water sent to the hot water side flow passage 9 and the water side flow passage 10 are decompressed by the hot water side valve body 11 and the water side valve body 12, respectively. It flows into the side secondary pressure chamber 14. Here, when a pressure difference between the two secondary pressure chambers occurs,
If the pressure in the water-side secondary pressure chamber 14 is higher than that in the water-side secondary pressure chamber 13, the diaphragm 15 spreads out toward the water-side secondary pressure chamber 13 and is connected to the diaphragm 15. The body 11 operates in the opening direction and the water side valve body 12 operates in the closing direction,
It becomes stable when the pressures in the two secondary pressure chambers become equal. Further, when the pressure difference between the secondary pressure chambers is reversed, the secondary pressure chambers operate in the opposite direction to the above, and the two secondary pressure chambers are always equal.

Further, when the back pressure chambers 17 and 18 for introducing the secondary pressure are provided, it is common to provide a sealing material in order to prevent mixing from the primary side. The gap between the inner wall of the hot water side back pressure chamber 17 and the gap between the water side valve body 12 and the water side back pressure chamber 18 are set minutely, and no sealing material is provided, and pressure is adjusted by sliding resistance by the sealing material. It is a pressure regulating valve with stable pressure regulation function that eliminates functional deterioration and can react sensitively even when there is a slight pressure change.

According to the above configuration, the hot water side secondary pressure chamber 13 and the water side secondary pressure chamber 14 are partitioned by the metal diaphragm 15, so that the hot water and the water are not mixed and the metal diaphragm is used. As a result, the reliability is improved as compared with a general diaphragm.

Effects of the Invention As described above, according to the automatic pressure regulating valve of the present invention, the following effects are obtained.

(1) The water-side valve body and the water-side valve body are pressure-balanced with respect to the primary pressure so as not to be affected by the primary pressure of the hot water and water, and have a function of reducing the pressure on the hot water side. As a result, the valve body is not affected by fluctuations in the primary pressure of hot water and water, and a stable and highly accurate secondary pressure balance can be obtained.

(2) Since the two secondary pressure chambers are partitioned by the diaphragm, mixing of hot water and water is prevented, and there is no deterioration of function due to the adhesion of minute foreign matter such as scale.

(3) Since the pressure receiving area of the diaphragm is larger than that of the hot water valve and the hot water valve, accurate pressure adjustment is possible even with a small secondary pressure difference, and even if foreign matter is caught in the piston Since the acting force is large, it can be easily released.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional automatic pressure regulating valve, and FIG. 2 is a sectional view of an automatic pressure regulating valve showing an embodiment of the present invention. 9 ... Hot water side flow path, 10 ... Hot water side flow path, 11 ... Hot water side valve body, 12 ... Water side valve body, 13 ... Hot water side secondary pressure chamber, 14 ...
… Water side secondary pressure chamber, 15 …… Diaphragm.

Claims (2)

[Claims] 1. A hot water side flow path, a hot water side flow path, a hot water side valve body provided in each of these two flow paths for reducing the primary pressure of hot water and water, a water side valve body, and the hot water side. A hot water piston for balancing the primary pressure of the hot water applied to the hot water valve provided in connection with the valve body, and a primary pressure of water applied to the hot water valve provided in connection with the hot water valve A water side piston for balancing, a hot water side back pressure chamber provided on the back surface of the hot water side piston for introducing the hot water side secondary pressure, and a hot water side secondary pressure provided for on the back surface of the hot water side piston. A water side back pressure chamber, a hot water side secondary pressure chamber through which hot water and water on the secondary side pass, a water side secondary pressure chamber, and the hot water side valve that operates at the hot water side secondary pressure and the water side secondary pressure A body and a diaphragm having a pressure receiving area larger than that of the water-side valve body are provided, and the hot-water side valve body and the water-side valve body are connected to each other at the diaphragm portion. With the change in the pressure balance water side secondary pressure, the automatic pressure regulating valve, wherein the water-side valve body and the hot water-side valve body is hot-side operating inversely with, to equalize the secondary pressure of the water side. 2. The automatic pressure regulating valve according to claim 1, wherein the diaphragm is a metal diaphragm.