JP2584250B2 - Mixing valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for mixing a steam (including hot water) and a cold liquid such as cold water, which can be used arbitrarily in a factory or the like, to obtain a mixed liquid at a desired temperature. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chilled water precedence type mixing valve device which is operated only by opening a downstream faucet or the like.

<Prior Art> In the embodiment of Japanese Patent Application No. 62-101398 (Japanese Patent Publication No. Hei 7-26694) already filed by the present applicant, a metal-made pilot valve spring is urged toward the temperature-sensitive mover. A mixing valve device having a pilot valve element is shown.

However, in this case, when the user closes the faucet on the downstream side, the pressure-sensitive chamber pressure on the upper side of the diaphragm is mainly discharged from the pilot valve port provided on the pressure-sensitive mover. Since the pressure of the pressure-sensitive chamber was very small in terms of mechanism, the pressure drop in the pressure-sensitive chamber was later than the timing of closing the faucet.
As a result, even though the discharge of the mixture has stopped, the steam inlet valve is not closed, so that steam may flow into the mixing chamber and the high-temperature mixture may stay between the mixing chamber and the faucet. Was.

In addition, when the water supply is suddenly interrupted (when the cooling liquid is stopped), there is a risk that the steam blows out of the faucet due to a delay in the closing timing of the steam inlet valve.

<Purpose> Therefore, the present invention is intended to prevent a delay in closing timing of a steam inlet valve when the faucet is closed, and there is a danger that a high-temperature mixed liquid will stay between the mixing chamber and the faucet, and a risk that steam will blow out from the faucet. It is an object of the present invention to provide a mixing valve device capable of preventing the occurrence of the above.

<Means for Solving the Problems> In the means for solving the problems of the present invention, as shown in FIGS. 1 to 6, a casing 1 and a steam inlet 2 for introducing steam (including a high-temperature liquid in the present invention). A cooling liquid inlet 3 for introducing a cooling liquid, and a mixing chamber 4 for mixing the vapor and the cooling liquid to a predetermined temperature.
And a mixed liquid outlet 5 for extracting the mixed liquid, a steam inlet valve V1 is provided at the steam inlet 2 and a cold liquid is introduced into the mixing chamber 4 at the cold liquid inlet 3 A differential pressure mechanism V2 for generating a differential pressure ΔP between the cold liquid inlet 3 and the mixing chamber 4 is provided.

A pilot valve V3 is provided in a part of the pilot passages R1, R2, R3 for transmitting the differential pressure ΔP from the cold liquid inlet 3 to the pressure sensing chamber 6 for forcibly opening the steam inlet valve V1.

The pilot valve V3 has a small gap L (pilot valve port L) only by the cold liquid differential pressure acting from the cold liquid inlet 3 side.
And the small gap L is widened only by the back flow of the cold liquid from the pressure sensitive chamber 6 side (the pilot valve port L
(A fully opened) is provided with a spherical pilot valve 40 which moves to the position.

<Operation> In the above problem solving means, when the faucet on the side of the mixed liquid outlet 5 is closed, the pilot valve 40 is pushed in the opposite direction by the high-pressure liquid in the pressure-sensitive chamber 6 to the position shown by the phantom line, and is fully opened. The passage gap L2 between the pilot valve port L and the temperature-sensitive mover 9
, The pressure-sensitive chamber liquid is discharged, and the pressure in the pressure-sensitive chamber 6 drops at a stretch, and the pressure-sensitive moving element 7 moves upward. For this reason, when the faucet is closed, the timing of closing the steam inlet valve V1 is unlikely to be delayed, and the danger of the high-temperature mixed liquid remaining between the mixing chamber 4 and the faucet and the danger of steam blowing out of the faucet are prevented. .

<Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a central longitudinal section of an embodiment of a mixing valve apparatus according to the present invention in a state where a mixed liquid is not used, FIG. 2 is a plan view of a state in which an upper cover and a diaphragm are removed, FIG. FIG. 4 is a vertical sectional side view of the center of the mixed liquid using state, FIG. 5 is a vertical sectional view of the differential pressure mechanism, and FIG. 6 is a diagram showing the performance of the differential pressure mechanism.

As shown in the figure, the mixing valve device of the present invention comprises a casing 1, a steam inlet 2 for introducing steam (including a high-temperature liquid in the present invention), a cold liquid inlet 3 for introducing a cold liquid, A mixing chamber 4 for mixing the liquid with a predetermined temperature and a mixed liquid outlet 5 for discharging the mixed liquid are provided. An inlet valve chamber J communicating with both chambers is formed between the steam inlet 2 and the mixing chamber 4, and a steam inlet valve V1 is provided in the inlet valve chamber J, and most of the outer periphery of the valve chamber J is provided. Is formed, a cooling liquid chamber K for cooling the partition Q of the steam inlet 2 with the mixing chamber 4 is formed, and the cooling liquid chamber K is communicated with the cold liquid inlet 3.

Further, a differential pressure mechanism V2 for introducing the cold liquid into the mixing chamber 4 at the cooling liquid inlet 3 and generating a pressure difference ΔP between the cooling liquid inlet 3 and the mixing chamber 4 is provided. Further, a bypass hole H is formed in a wall surface between the cold liquid inlet 3 and the mixing chamber 4 to always ensure a minimum amount of the cold liquid passing therethrough.

As shown in the phantom line in FIG. 5, a bypass hole H2 for always ensuring the minimum amount of the cooling liquid may be formed in the differential pressure valve 14 located between the cooling liquid inlet 3 and the mixing chamber 4. .

Further, in order to forcibly open the steam inlet valve V1, there is provided a valve opening mechanism M having a pressure-sensitive chamber 6, a pressure-sensitive mover 7 and a water flow restrictor 8 that move in proportion to the pressure. Have been. The water restrictor 8 gradually increases the opening area of the cold liquid hole 4a of the mixing chamber 4 after the valve body 7 and the movable element 7 have moved to a valve opening method by a certain value S (almost fully open value of the steam inlet valve V1). The water flow restricting valve body 8 is composed of a restricting peripheral wall 8a, an upper and lower through hole 8b, and a central push rod 8c screwed and fixed to the mover 7. The throttle valve element 8 is vertically slidably fitted to a valve case E fixed to the casing 1.

As shown in FIG. 3, an automatic temperature control mechanism N having a temperature-sensitive mover 9 which moves at the outlet side of the mixing chamber 4 by sensing the temperature of the mixed solution.
And a first pilot passage R1 and a second passage R for transmitting the differential pressure ΔP from the cold liquid inlet 3 to the pressure sensitive chamber 6.
2, a third passage R3 is formed, and a pilot valve V3 is provided in the second passage R2 for pilot. Also, the pilot valve V3
A temperature setting mechanism C for variably setting the size of the minute gap L (pilot valve port L) is provided.

The size of the minute gap L is the same as that of the temperature-sensitive moving element 9.
The small gap L and the temperature-sensitive mover 9 are associated with each other so as to be automatically reduced by the high-temperature side movement X and automatically increased by the low-temperature side movement Y.

As shown in FIG. 1, the steam inlet valve V1 is provided with a valve seat 11a having valve holes 10a and 10b communicating the steam inlet 2 and the mixing chamber 4, and a valve element which can be attached to and detached from the valve seat 11a. And a valve spring 13 for urging the valve 12 toward the seat. The valve seat portion 11a and the lift guide 11b for the valve 12 are formed integrally with the valve case E.

Further, the differential pressure mechanism V2 includes a mushroom-shaped differential pressure valve element 14 which is vertically slidably fitted to the guide portion 1a of the casing 1;
A valve seat 1b with a cold liquid inflow hole 15 on which the head 14a is seated, and a valve for generating a pressure difference between the inlet 3 and the mixing chamber 4 by urging the valve element 14 to the closing side of the inflow hole 15 Spring 16 and accommodation room for spring 16
The cooling liquid hole 4a includes a pressure equalizing communication hole 14c penetrated through the body 14b of the valve element 14 so as to communicate the mixing chamber 4 with the mixing chamber 4.

A mixing pressure chamber communicated with the mixing chamber 4 through a communication hole 19;
A diaphragm 21 is interposed between the pressure sensing chamber 6 and the pressure sensing chamber 6. The base of the pressure-sensitive moving element 7 is connected to the diaphragm 21 via a substrate 22 on the lower surface thereof, and the pressure-receiving surface (upper surface) of the diaphragm 21 when there is no load and the pressure-sensitive chamber 6 opposed thereto.
An urging means 24 for urging the diaphragm 21 is provided so that the depth F of the pressure-sensitive chamber, which is a gap with the top wall 23a (the lower surface of the upper lid 23), is made as thin as possible.

The biasing means 24 is made of a conical spring (or the elasticity of the diaphragm itself), and is screwed to the upper end of the moving element 7 through the diaphragm 21 and the substrate 22 to maintain the depth F of the pressure-sensitive chamber. The stopped stopper 25 is provided, and the pressure-sensitive chamber 6 is provided.
And the mixing pressure chamber 20 are communicated by small holes 25a, 25b, 7a formed in the movable element 7 and the stopper 25.

The spring 24 has such a force as to push up the weight of the movable element 7 and the water flow restrictor 8, and when the pressure fluid does not act on the pressure sensing chamber 6, the stopper 24 presses the stopper 25 of the diaphragm 21 against the upper lid 23, and The initial air inside the pressure chamber 6 is prevented from remaining.

Accordingly, the valve-opening mechanism M is composed of a guide plate 26 fixed inside the casing 1 and an upper end of the pressure-sensitive moving member 7 fitted inside the center hole 26a of the guide plate 26 so as to be slidable up and down. A pressure-sensitive chamber 6 formed by the diaphragm 21 and the upper lid 23 of the casing 1, surrounded by the diaphragm 21 and a guide plate 26 and connected to the mixing chamber 4 by a communication hole 19. The pressure chamber 20 includes a mixed pressure chamber 20 and small holes 25a, 25b, 7a formed between the chambers.

As shown in FIG. 3, the automatic temperature control mechanism N
The temperature-sensitive movable member 9 slidably fitted in the case 27; and a spring receiving portion projecting from an intermediate portion of the temperature-sensitive movable member 9.
28, a spring seat 30 screwed into the case 27 and slidable with the movable element 9, a valve spring 31 interposed between the spring receiving portion 28 and the spring seat 30, and a temperature-sensitive movable element 9 Spring receiver 28 and temperature sensing chamber
A bimetal 33 as a heat-sensitive deformation element for sensing the temperature of the liquid mixture interposed between the side walls of the heat-transfer element 9
A third passage R3 for pilot surrounding 9b and the case 27
A second pilot passage R2 communicating with the first pilot passage R1 is drilled at one end of the temperature setting rod.

The bimetal 33 is composed of a plurality of combinations of a pair of bimetal pieces facing each other on the low expansion side, is flat at a temperature of zero degree or lower, and is curved at normal temperature. And
The first passage R1 communicates with the cold liquid inlet 3 and the pilot pressure introducing hole 36 through a strainer.

As shown in FIG. 3, the minute gap L (pilot valve port L) of the pilot valve V3 includes a valve seat 38 in which a valve seat hole 37 is formed, and a spherical pilot valve disposed so as to be able to be detached and attached to the valve seat 38. Child 40,
It is constituted by the temperature-sensitive mover 9.

The spherical pilot valve 40 is formed of a lightweight material such as a synthetic resin, and the second passage R2 for the pilot in the temperature setting rod 34 has a large-diameter path having a diameter larger than that of the pilot valve 40.
r1 and a plurality of small-diameter paths r2 having a diameter smaller than that of the pilot valve element 40 and orthogonal to the large-diameter path r1. The pilot valve element 40 is thermosensitive only by a differential pressure acting from the cold liquid inlet 3 side. The small gap L is brought into contact with the tip terminal 9b of the moving element 9 and
(Pilot valve port L) is narrowed, and the pilot valve 40 is connected to the front terminal 9b by the cold liquid backflow from the pressure sensing chamber 6 side.
The small gap L is widened further (the pilot valve port L is fully opened) and the large-diameter path r1 and the small-diameter path r2 are opened.

A leading terminal 9a fitted to the leading end of the temperature-sensitive moving element 9 is fitted into the valve seat hole 37 while holding the passage gap L2. The valve element 40 and the differential pressure mechanism V2 are associated with each other so as to act on the pilot valve element 40 such that the small gap L becomes smaller as the differential pressure ΔP increases.

In the temperature setting mechanism C, the temperature setting rod 34 is a valve case.
The temperature setting rod 34 is fixed to the other end of the temperature setting rod 34 with a small screw 42 at the other end thereof. When the rotating ring 41 is rotated to move the temperature setting rod 34 in the direction of the arrow X, the valve seat 38 is pushed, so that the minute gap L becomes large and the pilot pressure in the mixing chamber 4 becomes large. Since the steam inlet valve V1 is greatly opened, the predetermined temperature of the mixture is set to a high temperature. Conversely, if the temperature setting rod 37 is moved in the direction of the arrow Y, the minute gap L is reduced, and the pilot space in the mixing chamber 4 is reduced. Since the pressure becomes small and the steam inlet valve V1 opens small, the mixture is set at a low temperature.

 Note that T is a wall bracket.

Next, the operation will be described. First, the desired temperature of the mixture is set by moving the temperature setting rod 34 in the X or Y direction. In this state, when the faucet on the mixed liquid outlet 5 side is opened, the low-temperature mixed liquid stored in the mixed liquid outlet 5 and the mixing chamber 4 first flows out.

When the use of the mixing valve device is stopped for a long time, the steam in the steam inlet valve chamber J is condensed, and this is stabilized at a temperature at which the heat balance of the entire mixing valve device is balanced. Further, since the volume of the jacket-shaped cold liquid chamber K is appropriately set, the temperature of the retained mixed liquid in the mixed liquid outlet 5 and the mixed chamber 4 is prevented from rising abnormally.
The danger of user burns is eliminated.

As described above, when the low-temperature mixed liquid stored in the mixed liquid outlet 5 and the mixing chamber 4 flows out,
The pressure inside the cold liquid inlet 3 rises, the valve 14 of the differential pressure mechanism V2 rises, the inflow hole 15 opens, and the cold liquid inside the cold liquid inlet 3 becomes low. Flows into the mixing chamber 4.

At this time, since the bypass hole H is formed between the mixing chamber 4 and the cold liquid inlet 3, when the flow rate of the cold liquid is small and the differential pressure is small as shown in FIG. 6, the valve spring 16 does not compress. Therefore, the differential pressure mechanism V2 does not operate, the differential pressure is transmitted only by the bypass hole H, the cold liquid flows in, and the control of the extremely small flow rate becomes possible. When the flow rate of the cooling liquid gradually increases and overcomes the valve closing force of the valve spring 16, the valve spring 16 starts to compress, and thereafter, the cooling liquid flows through both the bypass hole H and the differential pressure mechanism V2.

At the same time as this inflow, the pilot cold liquid in the cold liquid inlet 3 is
After passing through the strainer from the pilot pressure introducing hole 36, and further passing through the pilot first passage R1, the second passage R2, the minute gap L, and the third passage R3 in this order, it enters the pressure-sensitive chamber 6, and The diaphragm 21 and the pressure-sensitive moving element 7 move downward due to the pressure difference between the mixing chamber 4 and the mixing pressure chamber 20 at the same pressure, and the steam inlet valve
The valve 12 of V1 is moved downward to open the valve holes 10a and 10b. As a result, steam enters the mixing chamber 4 for the first time, mixes with the already-entered cold liquid, and the mixed liquid having reached a predetermined temperature flows out of the mixed liquid outlet 5 through the faucet. That is, it is safe because only the steam does not flow unless the cold liquid flows into the mixing chamber 4. Note that the cold liquid that has entered the pressure-sensitive chamber 6 is a small hole 25a,
The mixture enters the mixing chamber 4 through 25b and 7a.

When the temperature of the mixed solution becomes higher than a predetermined temperature, the bimetal 33 as a temperature-sensitive deformable element is further curved than a predetermined shape and pushes the temperature-sensitive moving element 9 in the X arrow direction against the valve spring 31. L becomes small, and the pilot cold liquid only enters a small gap L a little, and the diaphragm 21 and the pressure-sensitive moving element 7
Moves upward to reduce the opening of the steam inlet valve V1 and reduce the amount of inflow of steam, so that the mixture is maintained at a predetermined temperature.

In addition, although there is no problem in the usage range in the normal temperature setting of the mixed solution, high temperature water required as the mixed solution may not be obtained depending on the conditions of the piping facilities and the like. That is, in the mixing valve device of this embodiment, since the flow rate of the mixed liquid is basically determined by the user on the downstream side faucet, when the mixed liquid flow rate is increased and the temperature is set to a high temperature, the steam inlet valve is fully opened. However, the amount of heat is insufficient, so in such a case, as shown in FIG.
Due to the pressure difference between the pressure-sensitive chamber 6 and the mixing pressure chamber 20, the pressure-sensitive moving member 7 is lowered, and at the same time, the water flow restrictor 8 is also lowered to cool the cooling liquid hole 4a.
And squeezed until an initial temperature is obtained to obtain hot water. However, as a matter of course, the flow rate of the mixed solution decreases below the set value. It should be noted that the throttle valve element 8 starts to throttle after the valve 12 of the steam inlet valve V1 is fully opened.

The pilot valve port L is formed by a pilot valve 40, a large-diameter path r1, and a plurality of small-diameter paths r2 orthogonal thereto.
When the faucet is closed, the pilot valve is closed because the flow path is not blocked even when the fluid flows backward.
40 is pushed in the opposite direction by the high-pressure liquid in the pressure-sensitive chamber 6 to the position shown in the phantom line, and passes through the fully opened pilot valve port L and the passage gap L2 of the temperature-sensitive mover 9 to cause the liquid in the pressure-sensitive chamber 6 to move. Is discharged and the pressure drops at once. For this reason, when the faucet is closed, the timing of closing the steam inlet valve V1 is unlikely to be delayed, and the danger of the high-temperature mixed liquid remaining between the mixing chamber 4 and the faucet and the danger of steam blowing out of the faucet are prevented. .

Further, by using a material having a low specific gravity, such as rubber or synthetic resin, for the pilot valve 40, the pilot valve 40 can be operated only by the cold liquid flow pressure from the cold liquid inlet 3 to the pressure sensitive chamber 6 side.
Is guided to the valve port L and comes into contact with the leading terminal 9b of the temperature-sensitive movable member 9, so that a pilot valve spring for guiding is not required.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention.

<Effects of the Invention> As is apparent from the above description, the present invention is configured such that the flow path is not blocked even when the fluid flows backward through the pilot valve port. Therefore, according to the present invention, when the faucet is closed, the pilot valve is pushed in the opposite direction by the high-pressure liquid in the pressure-sensitive chamber, and the liquid in the pressure-sensitive chamber is discharged from the fully opened pilot valve port, and the pressure drops at once. Therefore, when the faucet is closed, the delay of the closing timing of the steam inlet valve hardly occurs, and the danger that the high-temperature mixed liquid stays between the mixing chamber and the faucet, and the danger of steam blowing out from the faucet can be prevented. There is.

[Brief description of the drawings]

FIG. 1 is a front view of a central longitudinal section of an embodiment of a mixing valve apparatus according to the present invention in a state where a mixed liquid is not used, FIG. 2 is a plan view of a state in which an upper cover and a diaphragm are removed, FIG. FIG. 4 is a vertical sectional side view of the center of the mixed liquid using state, FIG. 5 is a vertical sectional view of the differential pressure mechanism, and FIG. 6 is a diagram showing the performance of the differential pressure mechanism. 1: casing, 2: steam inlet, 3: cold liquid inlet, 4: mixing chamber, 4
a: Cold liquid hole, 5: Mixed liquid outlet, 6: Pressure sensitive chamber, 7: Pressure sensitive slider, 8:
Water flow restrictor, L: Micro gap (pilot valve port), 40: Pilot valve, J: Inlet valve chamber, K: Cold liquid chamber, M: Valve opening mechanism, Q:
Partition, R1, R2, R3: first, second, third passage for pilot, r1: large path, r2: small path, S: constant value, V1: steam inlet valve, V2: differential pressure mechanism, V3 : Pilot valve.

Claims (1)

(57) [Claims] 1. A casing, a steam inlet for introducing steam, a cold liquid inlet for introducing cold liquid, a mixing chamber for mixing the steam and the cold liquid at a predetermined temperature, and a mixed liquid for discharging the mixed liquid. In the mixing valve device having an outlet, a steam inlet valve is provided at the steam inlet, and at the cold liquid inlet, a cold liquid is introduced into the mixing chamber and a differential pressure is generated between the cold liquid inlet and the mixing chamber. A pilot valve is provided in a pilot passage for transmitting the differential pressure from the cold liquid inlet to a pressure sensitive chamber for forcibly opening the steam inlet valve, and the pilot valve is provided with a cold liquid A pilot valve is provided which moves to a position where the pilot valve port is narrowed only by the cold liquid differential pressure acting from the inlet side and moves to a position where the pilot valve port is fully opened only by the cold liquid backflow from the pressure sensitive chamber side. A mixing valve device characterized by the above-mentioned.