JP2525745B2 - Pressure balance valve mechanism in hot and cold water mixing tap - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a piston valve type pressure balance valve mechanism for maintaining equal pressures on the hot water side and the water side before mixing in a hot and cold water mixing valve.

[Conventional technology]

As illustrated in FIG. 2, a conventional piston valve type pressure balancer for a mixing plug of this type divides and forms valve chambers c and d by a slidable piston b in a cylinder a having a constant inner diameter. Each of the valve chambers is provided with a water supply pipe e.f and a water supply pipe g.h on the water side, and a horizontal axis i passing through the piston b has the same diameter as the piston b at both ends and a water passage hole. A valve body k ・ l formed by piercing j ・ j is fixed so that the openings of both of the water supply pipes e ・ f can be alternately shielded by this valve body (actual exploitation Sho 57-144671).
Or a cylinder chamber is provided in the stopper housing, and a piston that slides in the chamber and a valve element that is fixed to both ends of the horizontal axis that penetrates the chamber separates the hot water side and water side valve chambers. On the other hand, there is known one in which both ends of the cylinder are used as valve seats and the opening amount of the valve seats is alternately increased and decreased according to the pressure difference between the valve chambers on both sides of the piston (see JP-A-61-278679). It was being done.

[Problems to be Solved by the Invention]

Among the pressure balancers in the conventional hot and cold water mixing valve as described above, the former is the valve body k.multidot.k through the hot water side or the water side fluid flowing through the water supply pipes e and f into the cylinder a through the water passage holes j and j. L to the back of the valve body, and the valve body k
It was intended to control the amount of inflow from the high pressure side by moving l, and in the latter case, the piston is directly pushed by the fluid pressure on the hot water side or the water side acting on both sides of the piston, and both valves of the cylinder are It tried to obtain a pressure balance in the chamber. Therefore, in any balancer, the pressure is balanced at the part where a strong turbulent flow occurs when flowing from each water supply pipe into the cylinder, and depending on the direction of flow, not only the error in both pressures becomes significantly large, but also the primary When the pressure balance between both valve chambers is disrupted due to the pressure on the side or the amount of mixed hot water used, the piston valve cannot follow and vibration occurs. For example, stable equalization of hot water and water pressure cannot be expected. It was observed. In addition, the balancer having such a structure could hardly be put to practical use for a large flow rate mixing plug, and further, high precision is required for manufacturing and processing the members in the pressure adjusting portion, resulting in high cost. Was seen.

[Means for solving the problem]

Therefore, the present inventor has taken advantage of the fact that the pressures on the hot water side and the water side that operate the piston valves of this type of balancer are not affected by turbulence, and that the water pressure immediately before flowing into the mixing chamber is utilized to obtain the mixed hot water to be taken out. It focuses on the fact that is most suitable for the control of. That is, a piston that is slidable inside the cylinder is provided in the center of a cylinder in which the water supply pipe and the water supply pipe and the discharge pipe of the water side are respectively opened, and the valve bodies are fixed on both sides of the piston at symmetrical positions via a horizontal axis. In addition, the valve body is configured to be able to alternately shield the hot water side and the water side discharge pipe while blocking the communication between the water supply pipe and the discharge pipe and the cylinder end portion by the respective valve bodies. A closed space is defined by the back surface of each valve body, and each discharge pipe is connected to the mixing chamber via the rectifying chamber, and the hot water side and the water side of the rectifying chamber immediately before flowing into the mixing chamber are formed. The pressure is introduced into the closed space on the back surface of each valve body by a bypass pipe, thereby technically solving the problem described above. Generally, in this kind of hot and cold water mixing valve, the pressure of the hot water supply pipe and the water supply pipe is called primary pressure, the pressure of the discharge pipe is called secondary pressure, and the pressure of the mixing chamber is called open pressure.

[Action]

The pressure balance valve mechanism of the present invention having the above-described configuration flows into the mixing chamber instead of operating the piston due to an inaccurate pressure difference at the turbulent flow generation portion as seen in the conventional balancer of this type. The stable secondary pressure of the immediately preceding rectifying chamber is introduced into the closed space on the back of each valve body, and the valve body is moved by the back pressure difference, so the working pressure is extremely stable, and a compact mechanism is provided. However, it has a special effect that accurate equalization can be performed for a large flow rate of fluid.

〔Example〕

Hereinafter, the structure of the present invention will be further described on the basis of one embodiment shown in FIG. 1. 1 is a cylinder, 2 is a piston which is slidable at a fixed distance in the center of the cylinder, and 3 is left and right penetrating the piston. The horizontal axes, 4a and 4b, are valve bodies fixed to both ends of the horizontal axis 3, and the cylinder 1 is divided into two chambers, a hot water side A and a water side B. Further, 5a and 5b are water supply pipes, and 6a and 6b are discharge pipes, which respectively open facing both chambers A and B of the cylinder. Further, 7a and 7b are rectification chambers on the downstream side of the discharge pipes 6a and 6b, 8 is a mixing chamber which can communicate with the rectification chambers via, for example, piece valves 9a and 9b, and 10
Reference numerals a and 10b are handles for opening and closing the piece valves 9a and 9b.

In the figure, 11a and 11b are respective bypass pipes that lead from the rectifying chambers 7a and 7b to the closed spaces a and b defined on the back surfaces of both valve bodies 4a and 4b, and 12 is the outlet for the mixed hot water. Indicates.

Next, the operation of the pressure balance valve mechanism of the present invention will be described. Now, assuming that the water pressure on the hot water side from the water supply pipe 5a is PH,
PH is canceled by the pressure receiving surfaces of the valve body 4a and the piston 2 which face each other. This is the same for the hydraulic pressure PC on the water side, the piston 2 does not move, and the hot water and water flowing from both pipes are
It flows down into the rectifying chambers 7a and 7b through the respective turbulent flow areas h and c. Immediately before the hot water or water in the rectifying chambers 7a and 7b flows into the mixing chamber 8, that is, from the portion closest to the piece valves 9a and 9b, the back surfaces of both valve bodies 4a and 4b are closed via the bypass pipes 11a and 11b. It is introduced into the spaces a and b, and the pressures of Ph and Pc act on both valve bodies. In this case, if Ph> Pc, the piston 2 is pushed to the b side, and the opening of the discharge pipe 6a on the hot water side is pinched, Ph =
Balance at the point of Pc.

Therefore, by adjusting the amounts of hot water and water flowing into the mixing chamber 8 by operating the handles 10a and 10b, a desired hot water temperature can be continuously taken out from the discharge port 12.

Therefore, in the above embodiment, the piston is not actuated by the inaccurate pressure difference at the turbulent flow generation portion as seen in the conventional balancer of this kind,
The stable secondary pressure of the rectification chambers 7a and 7b immediately before flowing into the mixing chamber 8 is introduced into the closed spaces a and b on the back surface of each valve body, and the valve bodies 4a and 4b are moved by the back pressure difference. Because it is a thing,
The working pressure is extremely stable, and even with a small mechanism, accurate equalization can be performed for a large flow rate of fluid. In addition, due to its structure, particularly high precision is not required in the manufacture and processing of the valve mechanism portion, and the overall size can be greatly reduced.

In the above embodiments, the manual adjustment type hot and cold water mixing tap was described, but the principle of the pressure balance valve mechanism of the present invention is not limited to that of the above embodiment, and an electric or electronic automatic temperature control type hot and cold water mixing tap is used. It is also widely available.

〔The invention's effect〕

The pressure balance valve mechanism according to the present invention, unlike a conventionally known piston valve type pressure balancer in which the piston is operated by the pressure difference between the hot water and the turbulent flow region of the water, is different from that in the mixing chamber. Since the stable water pressure in the rectification chamber just before flowing in acts on the closed space on the back surface of both valve bodies, the opening amount of each discharge pipe is adjusted, so that accurate working pressure can be obtained on both the hot and cold sides. In addition to high balance performance, that is, equalization, can be expected even for large flow rates or low pressure flows, its structure does not require high precision to the left for manufacturing and processing of the valve mechanism section. It has a number of remarkable advantages such as the possibility of significantly reducing the size.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, and FIG. 2 is a partial sectional view showing an example of a conventional pressure balancer. In the figure, 1 ... Cylinder, 2 ... Piston, 3 ... Horizontal axis, 4a / 4b ... Valve chamber, 5a / 5b ... Inflow pipe, 6a / 6b ... Discharge pipe, 7a / 7b ... Rectification Chamber, 8 ... Mixing chamber, 9a / 9b ... Valve, 11a / 11b ... Bypass pipe.

Claims (1)

(57) [Claims] 1. A cylinder in which a water supply pipe and a water supply pipe on the hot water side and a discharge pipe on the water side are respectively opened, a piston which is slidable in the cylinder in the center, and valve bodies which are symmetrically positioned on both sides of the piston through a horizontal axis. Is fixed, and the valve body peripheral wall can alternately shield the hot water side and the water side discharge pipe while blocking the communication between the water supply pipe and the discharge pipe and the cylinder end portion by the respective valve bodies. The closed space is defined by the end portion and the back surface of each valve body, and each discharge pipe is connected to the mixing chamber via the rectifying chamber, and the hot water side and the water of the rectifying chamber immediately before flowing into the mixing chamber. A pressure balance valve mechanism in a hot and cold water mixing valve, wherein the pressure on the side is introduced into a closed space on the back surface of each valve body by a bypass pipe.