JP2626752B2 - 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 with a cold liquid or the like 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 an embodiment of the invention of Japanese Patent Application No. 61-168260 (Japanese Patent Publication No. 7-103937) already filed by the present applicant, a casing, a steam inlet for introducing steam, and a cold liquid are provided. In a mixing valve device having a cold liquid inlet to be introduced, a mixing chamber for mixing the vapor and the cold liquid at a predetermined temperature, and a mixed liquid outlet for discharging the mixed liquid, a steam inlet valve is provided at the vapor inlet. A differential pressure mechanism for introducing a cold liquid into the mixing chamber at the cold liquid inlet and for generating a differential pressure between the cold liquid inlet and the mixing chamber; and providing a pressure sensor for forcibly opening the steam inlet valve. A valve opening mechanism having a pressure chamber, a mixing pressure chamber, a diaphragm interposed therebetween, and a pressure-sensitive moving member connected to the diaphragm is provided.

<Problems to be Solved by the Invention> In the above prior art, when the faucet on the downstream side is closed, the upper and lower chambers of the diaphragm, that is, the pressure sensing chamber and the mixing pressure chamber have the same pressure. However, since the diaphragm tries to return to the original flat state, a space is created in the pressure-sensitive chamber. As a matter of course, the air collected there is compressed by the amount corresponding to the cold water pressure, and the volume is reduced. When the user opens the faucet again, the pressure in the mixing chamber and the mixing pressure chamber drops at a stretch. Accordingly, the volume of the air remaining in the pressure-sensitive chamber expands, and as a result, before the normal cold liquid pressure acts on the pressure-sensitive chamber, the pressure-sensitive moving element is pushed down and the inlet valve is pushed open. Abnormal operation occurs, and in the worst case, steam blows out from the eaves.

Therefore, an object of the present invention is to provide a mixing valve device capable of preventing abnormal operation of a steam inlet valve by providing a means for urging a diaphragm to reduce the amount of air remaining in a pressure-sensitive chamber as much as possible.

<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 discharging the mixed liquid, a steam inlet valve V1 having a valve element 12 urged in a valve closing direction by a valve spring 13 at the steam inlet 2. At the cold liquid inlet 3, a differential pressure mechanism V2 for introducing a cold liquid into the mixing chamber 4 and generating a differential pressure ΔP between the cold liquid inlet 3 and the mixing chamber 4 is provided.

Further, a valve opening mechanism M for forcibly opening the valve element 12 of the steam inlet V1 is provided, and the valve opening mechanism M is connected to the pressure-sensitive chamber 6 connected to the cold liquid inlet 3 and the mixing chamber 4. A communicating pressure chamber 20, a diaphragm 21 interposed between the pressure-sensitive chamber 6 and the mixing pressure chamber 20, and receiving a pressure difference between the pressure-sensitive chamber 6 and the mixing pressure chamber 20; A pressure-sensitive moving element 7 connected to the diaphragm 21 and abutting on and separating from the valve element 12 of the steam inlet valve V1; and between the tip of the pressure-sensitive moving element 7 and the valve element 12 when the steam inlet valve V1 is closed. At the time of no load.
The pressure receiving surface (upper surface) of the pressure sensing chamber 6 is opposed to the top wall 23 of the pressure sensing chamber 6.
A biasing means 24 is provided to bias the diaphragm 21 so as to make the pressure-sensitive chamber depth F, which is a gap therebetween, as thin as possible (about 0.5 mm) in a state along the lower surface of the upper lid 23. Have been.

<Operation> In the above problem solving means, when the faucet on the downstream side is closed, the upper and lower chambers of the diaphragm 21, that is, the pressure sensing chamber 6 and the mixing pressure chamber 20 have the same pressure. However, since the diaphragm 21 returns to the original upward convex state by the action of the urging means 24, only a small space is formed in the pressure-sensitive chamber 6. The air collected there is compressed by the amount corresponding to the cold water pressure and the volume is reduced. When the user opens the faucet again, the mixing chamber 4 and the mixing chamber
20 drops pressure at a stretch. Therefore, the amount of air staying in the pressure-sensitive chamber 6 is extremely small even if its volume expands.
When the faucet is opened, even if the air expands, it is very slight, and even if the pressure-sensitive moving element 7 is pushed down, the valve 12
There is no danger because the valve does not open and there is no abnormal operation.

<Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a central longitudinal sectional view of an embodiment of a mixing valve device according to the present invention in a state where a mixed liquid is not used, and FIG. FIG. 3 is a plan view showing the state where the upper lid and the diaphragm are removed, and FIG.
FIG. 4 is a sectional view taken along line BB of FIG. 1, and FIG. 6 is a plan view of the same water metering valve.

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 drawing out the mixed liquid; a vapor inlet valve V1 is provided at the steam inlet 2; A differential pressure mechanism V2 is provided between the cold liquid inlet 3 and the mixing chamber 4 for generating a pressure difference ΔP between the cooling liquid inlet 3 and the mixing chamber 4.

Further, there is provided a valve opening mechanism M having a pressure-sensitive chamber 6 for forcibly opening the steam inlet valve V1 and a pressure-sensitive moving member 7 which moves in proportion to the pressure thereof. After moving in the direction by a certain value S or more, a water flow restrictor 8 for gradually reducing the opening area of the cold liquid hole 4a of the mixing chamber 4 is attached to the movable element 7, and the water flow restrictor 8 is connected to the peripheral wall 8a for restriction. The external water flow restrictor 8 is composed of a vertical through hole 8b and a central cylinder 8c externally fitted and fixed to the movable element 7. The external water amount restricting valve body 8 is fitted to a valve case E fixed to the casing 1 so as to be vertically slidable. .

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.
A first pilot-cooled liquid passage R1, a second passage R2, which transmits the differential pressure ΔP from the cold liquid inlet 3 to the pressure-sensitive chamber 6 is provided.
A third passage R3 is formed, and a pilot valve V3 for forming a minute gap L is provided in the second pilot-cooled liquid passage R2. A temperature setting mechanism C for variably setting the size of the minute gap 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 related so that the small gap L is automatically made small by the high temperature side movement X and automatically made large by the low temperature measurement 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.

The differential pressure mechanism V2 includes a mushroom-shaped differential pressure valve element 14 that is vertically slidably fitted to the guide portion 1a of the casing 1 and the valve element.
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.

In addition, a diaphragm 21 is interposed between the pressure-sensitive chamber 6 and the mixing pressure chamber 20 that communicates with the mixing chamber 4 through the through hole 8b, the communication chamber 18, and the communication hole 19. The diaphragm 21
Is connected to the base end of the pressure-sensitive moving element 7 via a substrate 22 on the lower surface thereof, and the pressure-receiving surface (upper surface) of the diaphragm 21 at the time of no load and the ceiling wall 23a ( A biasing means 24 for biasing the diaphragm 21 is provided so as to make the depth F of the pressure-sensitive chamber, which is a gap with the lower surface of the upper lid 23, 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
Although a normal coil spring does not hinder the operation, a conical spring is more suitable for downsizing.

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. And 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 connected mixing pressure chamber 20, the inter-chamber communication small holes 25a, 25b, 7a drilled at the upper end of the pressure-sensitive mover 7, the distal end of the pressure-sensitive mover 7 and the steam inlet valve V1. Valve 12 when valve is closed
And a play gap G formed between them.

Since the play space G exists, the pressure-sensitive chamber 6
Even if the air remaining inside expands, the amount of downward movement of the pressure-sensitive moving element 7 is absorbed by the play gap G, and abnormal operation is efficiently prevented.

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 slidably fitted with the valve 9 screwed into the case 27, a valve spring 31 interposed between the spring receiving portion 28 and the spring seat 30, 9 spring receiver 28 and temperature sensing chamber
A bimetal 33 as a heat-sensitive deformation element for sensing the temperature of the mixed liquid interposed between the temperature-measuring element 32 and the tip terminal of the temperature-sensitive mover 9
Pilot cold liquid third path R3 surrounding 9b and the case 27
A temperature setting rod 34 is screwed into the first temperature setting rod 34. At one end of the temperature setting rod 34, a second pilot cooling liquid passage R2 communicating with the first pilot cooling liquid passage R1 is formed.

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 path R1 communicates with the cold liquid inlet 3 and the pilot pressure introduction hole 36 through a strainer (screen) 35.

As shown in FIG. 3, the minute gap L of the pilot valve V3 has a valve seat 38 in which a valve seat hole 37 is formed, and a spherical shape urged toward the small side of the minute gap L by a valve spring 39 in the valve seat 38. Pilot valve 40
And the temperature-sensitive mover 9.

In the valve seat hole 37, a front terminal 9b fitted to the front end of the temperature-sensitive mover 9 is fitted while holding the passage gap L2, and the tip of the tip terminal 9b is inserted into the pilot valve 40 with a small gap L. 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 inlet valve V1 is greatly opened, the predetermined temperature of the mixed liquid is set to a high temperature. Conversely, when the temperature setting rod 34 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.

In the differential pressure mechanism V2, the cooling liquid hole 4a provided downstream thereof serves as a differential pressure orifice at a normal mixed liquid usage amount, so that the differential pressure mechanism V2 hardly functions, The pressure mechanism V2 uses a small amount of mixed liquid and the diaphragm
This is useful when a differential pressure is unlikely to occur between the upper and lower surfaces. Therefore, usually, the valve 14 may not be provided.

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 side of the mixed liquid outlet 5 is opened, the low-temperature mixed liquid stored in the mixed liquid outlet 5 and the mixing chamber 4 first flows out, thereby lowering the liquid pressure in the mixing chamber 4. , A differential pressure ΔP is generated between the cooling liquid inlet 3 and the valve element 14 of the differential pressure mechanism V2 to rise, the inflow hole 15 is opened, and the cooling liquid in the cooling liquid inlet 3 flows into the mixing chamber 4. I do. At the same time, the pilot cooling liquid in the cooling liquid inlet 3 passes through the pilot pressure introducing hole 36, passes through the strainer 35, and further passes through the pilot cooling liquid first path R1, the second path R2, the minute gap L, and the third path R3 in this order. Then, the diaphragm 21 and the pressure-sensitive moving element 7 move downward due to the pressure difference between the pressure-sensitive chamber 6 and the mixed pressure chamber 20 having the same pressure as that of the mixing chamber 4. The valve 12 of the inlet valve 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. The cold liquid entering the pressure-sensitive chamber 6 enters the mixing chamber 4 through the small holes 25a, 25b, 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.

When the faucet is closed, the upper and lower chambers of the diaphragm 21,
That is, the pressure-sensitive chamber 6 and the mixed pressure chamber 20 have the same pressure. However, since the diaphragm 21 returns to the original upward convex state by the action of the urging means 24, only a small space is formed in the pressure-sensitive chamber 6.
The air collected there is simply compressed according to the cold water pressure, and the volume is reduced. When the user opens the faucet again,
The pressure in the mixing chamber 4 and the mixing pressure chamber 20 is reduced at once. Therefore, the amount of air retained in the pressure-sensitive chamber 6 is extremely small even if its volume expands. Therefore, even if the air expands when the faucet is opened, it is very small. Even if the pressure-sensitive mover 7 is depressed before the cold liquid pressure acts, the steam inlet valve
The valve 12 of V1 does not open and there is no danger at all.

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, according to the present invention, when the faucet on the downstream side is closed, the diaphragm receives the pressure receiving surface along the top wall of the pressure sensitive chamber by the urging means. Therefore, only a small space is formed in the pressure-sensitive chamber because the pressure-sensitive chamber is urged to make the depth of the pressure-sensitive chamber as thin as possible. Therefore,
Again, when the user opens the faucet, the pressure in the mixing chamber and the mixing pressure chamber drops at a stretch, and the amount of air retained in the pressure-sensitive chamber is extremely small even if its volume expands. Even if the pressure-sensitive moving element is pushed down before the cold liquid pressure is applied, the valve of the steam inlet valve does not open, and there is no danger.

In addition, since there is a gap between the tip of the pressure-sensitive mover and the valve when the steam inlet valve is closed, the air remaining in the pressure-sensitive chamber expands and moves the pressure-sensitive mover. Even so, the play amount absorbs the movement amount, so that the abnormal operation of the steam inlet valve can be reliably prevented.

That is, the present invention has an excellent effect that abnormal operation of the steam inlet valve in which steam is blown out from the faucet can be prevented.

[Brief description of the drawings]

1 is a side view of the embodiment of the mixing valve apparatus according to the present invention, in which the mixed liquid is not used, and FIG. 2 is a plan view of the same with the upper cover and diaphragm removed, and FIG.
FIG. 4 is a cross-sectional view taken along a line A-A, FIG. 4 is a cross-sectional view taken along a center line in a mixed liquid use state, FIG. 5 is a cross-sectional view taken along a line BB in FIG. 1, and FIG. 1: casing, 2: steam inlet, 3: cold liquid inlet, 4: mixing chamber, 5:
Mixture outlet, 6: Pressure sensitive chamber, 7: Pressure sensitive slider, 12: Steam inlet valve valve, 20: Mixed pressure chamber, 21: Diaphragm, 23a: Top wall, 2
4: biasing means, M: valve opening mechanism, F: depth of pressure sensing chamber, G: clearance, V1:
Steam inlet valve, V2: differential pressure mechanism.

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. A mixing valve device having an outlet and a steam inlet valve having a valve element biased in a valve closing direction by a valve spring at the steam inlet, and mixing the cold liquid with the cold liquid inlet. A differential pressure mechanism for introducing a pressure into the chamber and generating a differential pressure between the cold liquid inlet and the mixing chamber; and a valve opening mechanism for forcibly opening a valve of the steam inlet valve. The mechanism includes a pressure-sensitive chamber connected to the cold liquid inlet, a mixing pressure chamber connected to the mixing chamber, and a pressure-sensitive chamber interposed between the pressure-sensitive chamber and the mixing pressure chamber. A diaphragm that receives a pressure difference between the chamber and a diaphragm connected to the diaphragm and brought into contact with or separated from a valve of the steam inlet valve; A pressure-sensitive moving element, and a play gap formed between the distal end of the pressure-sensitive moving element and the valve element when the steam inlet valve is closed, and the pressure-receiving surface of the diaphragm faces the non-loading element when there is no load. Mixing characterized in that there is provided an urging means for urging the diaphragm so as to be along the top wall of the pressure-sensitive chamber and to reduce the depth of the pressure-sensitive chamber, which is a gap therebetween, as much as possible. Valve device