JPH0726694B2 - Mixing valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is intended to obtain a mixed liquid at a desired temperature by mixing steam (including hot water) and cold liquid such as cold water that can be arbitrarily used in factories. The present invention relates to a mixing valve device of a cold water precedent type that operates only when a faucet or the like on the downstream side is opened.

<Prior Art> In the embodiment of the invention of Japanese Patent Application No. 61-168260 (Japanese Patent Application Laid-Open No. 63-26474) already filed by the applicant, a casing, a steam inlet for introducing steam, and a cooling liquid are provided. In a mixing valve device comprising a cold liquid inlet to be introduced, a mixing chamber for mixing the steam and the cold liquid to a predetermined temperature, and a mixed liquid outlet for discharging the mixed liquid, a steam inlet valve is provided at the steam inlet. The
A pressure sensitive chamber is provided 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 forcibly opening the vapor inlet valve. A valve opening mechanism having a pressure sensitive moving element and a pressure sensitive moving element is provided.

<Problems to be solved by the invention> However, in the above configuration, although there is no problem in the range of use in the normal temperature setting of the mixed liquid, when high temperature water required as the mixed liquid cannot be obtained due to conditions such as piping equipment. There's a problem.

That is, in the mixing valve device, the flow rate of the mixed liquid is basically determined by the user at the faucet on the downstream side.Therefore, when the mixed liquid flow rate is increased and the temperature is set to a high temperature, the heat quantity is insufficient even if the steam inlet valve is fully opened. However, as a result, the temperature of the mixed solution may not rise.

Therefore, according to the present invention, when the mixed liquid flow rate is increased and the temperature is set to a high temperature, the cold liquid flow rate (mixed liquid flow rate) is not reduced until the steam inlet valve is almost fully opened, and after the fully opened state. Providing a mixing valve device capable of obtaining a liquid mixture at a desired temperature while slightly reducing the flow rate of cold liquid, in other words, maximizing the use of steam energy to obtain a liquid mixture at a desired temperature It is an object.

<Means for Solving Problems> In the problem solving means of the present invention, as shown in FIGS. 1 to 6, a casing 1 and a steam inlet 2 for introducing steam (including high-temperature liquid in the present invention) are introduced. A cold liquid inlet 3 for introducing a cold liquid, and a mixing chamber 4 for mixing the vapor and the cold liquid at a predetermined temperature.
And a mixed solution outlet 5 for discharging the mixed solution, a steam inlet valve V1 is provided at the steam inlet 2, and the 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 is provided between the cold liquid inlet 3 and the mixing chamber 4.

Further, a valve opening mechanism M having a pressure sensitive chamber 6 for forcibly opening the steam inlet valve V1 and a pressure sensitive moving element 7 that moves in proportion to the pressure thereof is provided, and the moving element 7 opens the valve. A water amount throttle valve body 8 for gradually squeezing the opening area of the cold liquid hole 4a of the mixing chamber 4 after moving by a constant value S (almost full open value of the steam inlet valve V1) in the direction is attached to the mover 7, and the water amount is The throttle valve body 8 is composed of a throttle peripheral wall 8a, a vertical through hole 8b, and a central cylinder 8c externally fitted and fixed to the moving element 7. The water amount throttle valve body 8 is a valve case E fixed to the casing 1. Is vertically slidably fitted to the.

<Operation> In the above problem solving means, when the mixed liquid flow rate is increased and the temperature is set to a high temperature, the amount of heat is insufficient even when the steam inlet valve is fully opened. In such a case, as shown in FIG. By the pressure difference between the pressure sensing chamber 6 and the mixing pressure chamber 20, the pressure sensitive moving member 7 descends, and at the same time, the water amount throttle valve body 8 descends until the desired temperature is obtained in the cold liquid hole 4a. Squeeze and get hot water. However, as a natural result, the flow rate of the mixed liquid is reduced below the set value. The water amount throttle valve body 8 starts to throttle after the valve 12 of the steam inlet valve V1 is fully opened.

<Example> Hereinafter, an example of the present invention is described based on a drawing. First
FIG. 3 is a side view of the central longitudinal section of the mixing valve device according to the embodiment of the present invention in a non-used state, FIG. 2 is a plan view of a state in which the upper lid and the diaphragm are removed, and FIG.
4 is a cross-sectional view taken along the line, and FIG.
FIG. 5 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 6 is a plan view of the water quantity throttle valve.

Then, as shown in the drawing, the mixing valve device of the present invention includes a casing 1, a steam inlet 2 for introducing steam (including high-temperature liquid in the present invention), a cold liquid inlet 3 for introducing cold liquid, and the steam and cold. It has a mixing chamber 4 for mixing the liquid with a predetermined temperature, and a mixed liquid outlet 5 for discharging the mixed liquid. A steam inlet valve V1 is provided at the steam inlet 2 and a cold liquid is mixed at the cold liquid inlet 3. Room 4
The pressure difference Δ between the cold liquid inlet 3 and the mixing chamber 4
A differential pressure mechanism V2 for generating P is provided.

Further, a valve opening mechanism M having a pressure sensitive chamber 6 for forcibly opening the steam inlet valve V1 and a pressure sensitive moving element 7 that moves in proportion to the pressure thereof is provided, and the moving element 7 opens the valve. A water amount throttle valve body 8 for gradually squeezing the opening area of the cold liquid hole 4a of the mixing chamber 4 after moving by a constant value S (almost full open value of the steam inlet valve V1) in the direction is attached to the mover 7, and the water amount is The throttle valve body 8 is composed of a throttle peripheral wall 8a, a vertical through hole 8b, and a central cylinder 8c externally fitted and fixed to the mover 7, and the water amount throttle valve body 8 is attached to a valve case E fixed to the casing 1. It is fitted so that it can slide up and down.

As shown in FIG. 3, an automatic temperature adjusting mechanism N having a temperature-sensitive moving element 9 for sensing and moving the temperature of the mixed liquid is provided on the outlet side of the mixing chamber 4, and the pressure-sensitive element 3 is introduced through the cold liquid inlet 3. A minute gap L is formed in a part of the pilot passages R1, R2, R3 for transmitting the differential pressure ΔP to the chamber 6. Further, a temperature setting mechanism C for variably setting the size of the minute gap L in the pilot passage is provided.

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

As shown in FIG. 1, the steam inlet valve V1 includes a valve seat portion 11a having valve holes 10a and 10b for communicating the steam inlet 2 and the mixing chamber 4, and a valve seat which can be freely seated on and off the valve seat portion 11a. 12 and a valve spring 13 that biases the valve element 12 toward the seating side. And the valve seat portion
The lift guide 11b for the valve 11 and the valve 11a is integrally formed with the valve case E.

In addition, the differential pressure mechanism V2 includes a mushroom-shaped differential pressure valve 14 that is vertically slidably fitted in the guide portion 1a of the casing 1, and the valve 14
Valve seat 1b with a cold liquid inflow hole 15 on which the head 14a of the valve seats is seated, and a valve spring for biasing the valve element 14 toward the inflow hole 15 closing side to generate a differential pressure between the inlet 3 and the mixing chamber 4. 16 and a storage chamber 17 for the spring 16
And a cooling liquid hole 4a, and a pressure equalizing communication hole 14c penetrating the body portion 14b of the valve 14 so as to communicate with the mixing chamber 4.

Further, a diaphragm 21 is interposed in the mixing chamber 4 between the pressure sensing chamber 6 and the mixing pressure chamber 20 communicated with 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 when there is no load and the ceiling wall 23a ( The pressure-sensitive chamber depth F, which is a gap with the lower surface of the upper lid 23, is as thin as possible (1 to 0.
An urging means 24 for urging the diaphragm 21 is provided so as to move the diaphragm 21 (about 5 mm).

The biasing means 24 is composed of a conical spring (or the elastic force of the diaphragm itself), and in order to maintain the depth F of the pressure sensing chamber, it penetrates the diaphragm 21 and the base plate 22 and is screwed to the upper end of the moving element 7. A stopper 25 fitted therein is provided, and the pressure sensing chamber 6 is provided.
The moving pressure chamber 20 and the mixing pressure chamber 20 are communicated with each other by small holes 25a, 25b, 7a formed in the moving element 7 and the stopper 25.

The spring 24 has a force enough to push up the weights of the mover 7 and the water amount throttle valve body 8, and when the pressure fluid does not act on the pressure sensing chamber 6, the stopper 25 of the diaphragm 21 is pressed against the upper lid 23 to sense the pressure. The initial air inside the pressure chamber 6 is prevented from remaining.

Therefore, the valve opening mechanism M is mounted on the guide panel 26 which is fitted and fixed in the casing 1 and the upper end portion of the pressure-sensitive moving element 7 which is vertically slidably fitted in the central hole 26a of the guide panel 26. The pressure sensitive chamber 6 formed by the fixed diaphragm 21, the diaphragm 21 and the upper lid 23 of the casing 1, the diaphragm 21 and the guide plate 26, and the mixing chamber 4 and the communication hole.
It is composed of a mixing pressure chamber 20 connected by 19 and inter-chamber communication small holes 25a, 25b, 7a formed at the upper end of the pressure-sensitive moving element 7.

As shown in FIG. 3, the automatic temperature control mechanism N includes a valve case 27,
The temperature-sensitive moving element 9 slidably fitted in the case 27.
And a spring receiving portion 28 protruding from the intermediate portion of the temperature-sensitive moving element 9.
A spring seat 30 which is screwed into the case 27 and slidable with the mover 9, a valve spring 31 interposed between the spring receiving portion 28 and the spring seat 30, and a temperature-sensitive mover 9. Spring receiver 28 and greenhouse 32
A bimetal 33 as a heat-sensitive deformable element for sensing the temperature of the mixed liquid, which is interposed between the side wall of the temperature sensor and the tip 9b of the temperature-sensitive moving element 9.
A third path R3 for cooling the cold of the pilot, and a temperature setting rod 34 screwed into the case 27, and one end of the temperature setting rod 34 communicates with the first path R1 for the cold cooling liquid. A second cold coolant passage R2 is provided.

The bimetal 33 is composed of a plurality of a pair of bimetal pieces facing each other on the low expansion side. The bimetal 33 is flat at a temperature of zero degrees or less and is curved at room temperature. The first passage R1 communicates with the cold liquid inlet 3 and the pilot pressure introducing hole 36 through the strainer 35.

As shown in FIG. 3, a pilot valve that forms the minute gap L.
V3 is provided, and the minute gap L of the pilot valve V3 is a valve seat 38 having a valve seat hole 37, and a spherical pilot urged to the small side of the minute gap L by a valve spring 39 in the valve seat 38. Valve 40
And the temperature-sensitive moving element 9.

Into the valve seat hole 37, a front terminal 9b fitted to the front end of the temperature-sensitive moving element 9 is inserted while holding a passage gap L2, and the tip of the tip terminal of the pilot valve 40 forms a minute gap L. The valve 40 and the differential pressure mechanism V2 are associated with each other so that the valve 40 and the differential pressure mechanism V2 are brought into contact with each other so as to act on the large side, and the minute gap L becomes smaller as the differential pressure ΔP increases, so that the minute valve L acts on the pilot valve 40.

In the temperature setting mechanism C, the temperature setting rod 34 has a valve case 27.
The temperature setting rod 34 is fitted with a screw 34a, and a manual rotation ring 41 is fixed to the other end of the temperature setting rod 34 with a small screw 42. When the rotary ring 41 is rotated to move the temperature setting rod 34 in the X direction, 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 largely opened, the predetermined temperature of the mixed liquid is set to a high temperature, and conversely, if the temperature setting rod 34 is moved in the Y arrow direction, the minute gap L becomes smaller, and the pilot in the mixing chamber 4 becomes smaller. Since the pressure becomes small and the steam inlet valve V1 opens small, the liquid mixture is set to a low temperature.

Incidentally, in the differential pressure mechanism V2, in the normal amount of mixed liquid used, the cold liquid hole 4a provided downstream thereof serves as a differential pressure orifice, so the differential pressure mechanism V2 hardly functions, but The pressure mechanism V2 is a diaphragm that uses a small amount of mixed liquid.
This is useful when it is difficult for differential pressure to occur between the upper and lower surfaces of 21. Yotsutte
Normally, the differential pressure valve 14 of the differential pressure mechanism may be omitted.

Next, the operation will be described. First, the desired temperature of the mixed liquid 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, whereby the liquid pressure in the mixing chamber 4 becomes low. Since a differential pressure ΔP is generated between the cold liquid inlet 3 and the cold liquid inlet 3, the differential pressure valve 14 of the differential pressure mechanism V2 rises, the inflow hole 15 opens, and the cold liquid in the cold liquid inlet 3 enters the mixing chamber 4. Inflow. At the same time, the cold coolant of the pilot enters the pressure sensitive chamber 6 through the first, second and third paths R1, R2, R3 for the pilot and the minute gap L, and the inside of the pressure sensitive chamber 6 and the mixing chamber 4 The diaphragm 21 and the pressure-sensitive moving element 7 are actuated in response to the pressure difference between the mixing pressure chamber 20 and the mixing pressure chamber 20 of the same pressure, and the valve 12 of the steam inlet valve V1 is moved downward to move its valve hole 10a,
Open 10b. As a result, the vapor enters the mixing chamber 4 for the first time, mixes with the cold liquid that has already entered, and the mixed liquid that has reached the predetermined temperature flows out from the mixed liquid outlet 5 through the faucet. That is, it is safe because only the steam does not flow in unless the cold liquid flows into the mixing chamber 4. The cold liquid that has entered the pressure-sensitive chamber 6 enters the mixing chamber 4 through the small holes 25a, 25b, 7a.

When the temperature of the mixed liquid becomes higher than a predetermined temperature, the bimetal 33, which is a temperature-sensitive deformable element, is further curved than the predetermined shape and pushes the temperature-sensitive mover 9 against the valve spring 31 in the X-arrow direction. L becomes small, the cold liquid of the pilot does not enter the minute gap L, and the diaphragm 21 and the pressure-sensitive moving element 7 move upward to reduce the opening of the steam inlet valve V1 and reduce the inflow amount of steam. The liquid is kept at a predetermined temperature.

It should be noted that although there is no problem in the range of use in the usual temperature setting of the mixed liquid, there are cases where high temperature water required as the mixed liquid cannot be obtained depending on conditions such as piping equipment. That is, in the mixing valve device of this embodiment, the flow rate of the mixed solution is basically determined by the user with the tap on the downstream side.Therefore, when the mixed solution flow rate is increased and the temperature is set to a high temperature, the steam inlet valve is fully opened. However, since the amount of heat is insufficient, in such a case, as shown in FIG. 4, due to the differential pressure between the pressure sensing chamber 6 and the mixing pressure chamber 20, the pressure sensing slider 7 is moved.
And at the same time, the water amount throttle valve body 8 also descends to throttle the cold liquid hole 4a until the initial temperature is obtained to obtain high-temperature hot water. However, as a natural result, the flow rate of the mixed liquid is reduced below the set value. It should be noted that the water amount throttle valve body 8 starts to throttle
It is after the valve 12 of V1 is fully opened.

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

<Effects of the Invention> As is clear from the above description, according to the present invention, when the flow rate of the mixed liquid is increased and the temperature is set to a high temperature, the pressure-sensitive mover descends due to the pressure increase in the pressure-sensitive chamber, and at the same time. Since the water amount throttle valve body also descends and the cold liquid hole to the mixing chamber is throttled until the initial temperature is obtained, high temperature hot water (the flow rate of the mixed liquid is less than the set value) can be obtained. That is, the cold liquid flow rate (mixed liquid flow rate) is not reduced until the steam inlet valve is almost fully opened, and after almost fully opened, the cold liquid flow rate is slightly reduced to obtain the mixed liquid at the desired temperature. There is an excellent effect that it is possible to obtain a liquid mixture having a desired temperature by making maximum use of the energy of steam.

[Brief description of drawings]

FIG. 1 is a side view of a central longitudinal section of a mixed valve device according to an embodiment of the present invention in a non-used state of a mixed liquid, FIG. 2 is a plan view of a state in which a top lid and a diaphragm are removed, and FIG.
Fig. 4 is a sectional view taken along the line A-A, Fig. 4 is a side view of the central longitudinal section of the liquid mixture in use, Fig. 5 is a sectional view taken along the line BB of Fig. 1, and Fig. 6 is a plan view of the water metering valve. 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 moving element, 8:
Water amount throttle valve body, M: valve opening mechanism, S: constant value, V1: steam inlet valve, V2: differential pressure mechanism.

Claims (1)

[Claims] 1. A casing (1), a steam inlet (2) for introducing steam, a cold liquid inlet (3) for introducing cold liquid, and a mixing chamber () for mixing the steam and the cold liquid at a predetermined temperature. 4) and a mixed solution outlet (5) for discharging the mixed solution, a steam inlet valve (V1) is provided at the steam inlet (2).
A cooling liquid is introduced into the mixing chamber (4) through the cooling liquid inlet (3), and the cooling liquid inlet (3) and the mixing chamber (4) are provided.
A pressure difference mechanism (V2) for generating a pressure difference (ΔP) is provided between the pressure sensing chamber (6) and the pressure sensing chamber (6) for forcibly opening the steam inlet valve (V1), and the pressure sensing chamber (6) moves by the pressure. A valve opening mechanism (M) having a pressure sensitive moving element (7) is provided, and after the moving element (7) moves in the valve opening direction by a certain value or more, the cold liquid hole (4a) of the mixing chamber (4) A mixing valve device characterized in that a water amount throttle valve body (8) for gradually narrowing the opening area is attached to the moving element (7).