JPH0726695B2 - 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 differential pressure mechanism for introducing a cold liquid into the mixing chamber into the mixing chamber and generating a differential pressure between the cooling liquid inlet and the mixing chamber is provided, and the pilot valve installed in the temperature setting mechanism has a valve The external contact method is such that the minute gap increases as the upstream pressure (differential pressure between the cold liquid inlet and the pressure-sensitive chamber) increases.

<Problems to be Solved by the Invention> Generally, since tap water is used as the cooling liquid, the amount of water used varies greatly depending on the time of use, resulting in large fluctuations in water pressure. However, the mixed liquid (warm water) discharged from the mixing valve device is often used for hand washing, etc., and even if the temperature setting is deviated by several degrees, it is felt as a great change for the user. You may be burned. Therefore, a mechanism is required to ensure that the temperature once set is maintained.

However, in the case of the external connection method of the prior application technology, the minute gap, that is, the opening degree of the pilot valve increases as the upstream pressure of the pilot valve increases, and the differential pressure rises. The pressure at the inlet of the pressure chamber rises at an accelerating rate, causing a deviation in the set temperature as shown in FIG.
In the figure, the change in the mixed liquid temperature when the cold liquid pressure (water pressure) is changed from the initial setting is shown. The default steam pressure is 1 kg / cm ^2.
g, cold liquid pressure (water pressure) is 1 kg / cm ² · g, and mixed liquid temperature is 40 ° C.

Therefore, according to the present invention, in the pilot valve, when the upstream pressure of the valve (the differential pressure between the cold liquid inlet and the pressure-sensitive chamber) increases, the minute gap becomes smaller, so that the cold liquid pressure is increased. It is an object of the present invention to provide a mixing valve device in which the temperature of the mixed liquid always stays at the set temperature even if it changes.

<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.

And, a pilot for forming a minute gap L 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 vapor inlet valve V1. A valve V3 is provided, and the minute gap L is formed by a valve seat 38 having a valve seat hole 37 formed therein and a spherical pilot valve 40 which is urged to the valve seat 38 by a valve spring 39 toward the small side of the minute gap L. And the temperature-sensitive moving element 9. The size of the minute gap L and the temperature sensitive movement are set so that the dimension of the minute gap L is automatically reduced by the high temperature side movement X of the temperature sensitive moving element 9 and is automatically increased by the low temperature side movement Y. It is related to the child 9.

<Operation> In the means for solving the above problems, the second low temperature liquid of the pilot liquid
When the cold liquid pressure flowing from R2 rises, the cold liquid pressure naturally acts on the pilot valve 40 of the pilot valve V3 and presses the valve 40 in the valve closing direction. ) Becomes smaller, but the differential pressure increases as the cold liquid pressure increases, and the discharge flow rate increases. As a result, the pressure in the downstream side low temperature third liquid path R3 of the pilot is almost unchanged from the initial setting. That is, the pilot valve V3 of the present invention provides a kind of constant flow valve action.

<Example> Hereinafter, an example of the present invention is described based on a drawing. First
The figure is a cross-sectional view taken along the line AA of FIG. 2 in the state where the mixed solution is not used, FIG. 2 is the same plan view of the state in which the upper lid and the diaphragm are removed, FIG. 3 is the same vertical side view in the center, and FIG. FIG. 5 is a central longitudinal side view of FIG. 5, FIG. 5 is a sectional view taken along the line BB of FIG. 1, and FIG.

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 predetermined value S or more is attached to the mover 7.
The water amount 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 fixed to the casing 1. It is fitted to E 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 ( A biasing means 24 for biasing the diaphragm 21 is provided so that the pressure sensing chamber depth F, which is a gap between the pressure sensing chamber and the upper lid 23, is made as thin as possible.

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 includes the guide plate 26 fitted and fixed to the casing 1 and the upper end of the pressure sensitive moving member 7 which is fitted in the central hole 26a of the guide plate 26 so as to be vertically slidable. Diaphragm 21 fixed to the portion, the pressure sensitive chamber 6 formed by 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.
And a spring seat that is screwed into the case 27 and is slidable with the valve element 9.
30, a valve spring 31 interposed between the spring receiving portion 28 and the spring seat 30, and a mixing interposed between the spring receiving portion 28 of the temperature-sensitive moving element 9 and the side wall of the greenhouse 32. A bimetal 33 as a heat-sensitive deformable element for sensing the liquid temperature, a pilot cooling liquid third passage R3 surrounding the tip terminal 9b of the temperature-sensitive moving element 9, and a temperature setting rod 34 screwed into the case 27 with a screw 34a. The temperature setting rod 34 is provided at one end thereof with a second coolant passage R2 for cooling the coolant of the first coolant R1.

The bimetal 33 is composed of a plurality of pairs of bimetal pieces with the low expansion sides facing each other, is flat at a temperature of zero degrees or less, and is curved at room temperature. However, the bimetal 33 may be flat if it is not considered to be used at room temperature or lower.

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 useful when the flow rate of the mixed liquid is small and the differential pressure between the upper and lower surfaces of the diaphragm 21 is unlikely to occur. Therefore, normally the differential pressure valve 14
It does not have to be.

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 move downward due to the differential pressure between the same pressure and the inside of the mixing pressure chamber 20, and the valve element 12 of the steam inlet valve V1 moves 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.

When the faucet 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 its original upwardly convex state by the action of the biasing means 24, only a small space is formed in the pressure sensing chamber 6. The air accumulated therein is compressed by the cold water pressure and its volume is reduced. Once again, when the user opens the tap,
The pressures of the mixing chamber 4 and the mixing pressure chamber 20 suddenly drop. Therefore, the amount of air accumulated in the pressure-sensitive chamber 6 is extremely small even if the volume thereof is expanded. Therefore, even if the air is expanded when the faucet is opened, the amount of the air is very small. Even if the pressure sensitive mover 7 is pushed down 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.

Next, the two are compared by the diagram showing the performance of the embodiment of the present invention in FIG. 7 and the diagram showing the performance of the prior art in FIG. In each figure, the change in the mixed liquid temperature when the cold liquid pressure (water pressure) is changed from the initial setting is shown. The default steam pressure is 1 kg / cm ^2.
g, cold liquid pressure (water pressure) is 1 kg / cm ² · g, and mixed liquid temperature is 40 ° C.

According to the embodiment of the present invention, when the cold liquid pressure flowing from the pilot low temperature liquid second path R2 rises, the pilot valve
The cold liquid pressure acts on the pilot valve 40 of V3, and the valve 40
Although the small gap L (valve opening) is reduced because the valve is pressed in the valve closing direction, the differential pressure increases as the cold liquid pressure increases.
The discharge flow rate increases, and as a result, the pressure of the downstream side low temperature liquid third passage R3 of the pilot hardly changes from the initial setting.
That is, the pilot valve V3 of the present invention provides a kind of constant flow valve action.

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 apparent from the above description, according to the present invention, when the upstream pressure of the valve element (the differential pressure between the cold liquid inlet and the pressure sensitive chamber) of the pilot valve increases, the minute gap becomes smaller. Since it is an inscribed system, the pilot valve has a function of a kind of constant flow valve, and has an excellent effect that the temperature of the mixed liquid always keeps the set temperature even if the cold liquid pressure fluctuates.

[Brief description of drawings]

1 to 7 show an embodiment of the mixing valve device of the present invention, and FIG. 1 shows A of FIG. 2 in a state where the mixed liquid is not used.
-A sectional view taken along the line A, FIG. 2 is a plan view of the state in which the upper lid and the diaphragm are removed, and FIG.
FIG. 5 is a side view of the central longitudinal section of the mixed liquid in use, FIG. 5 is a sectional view taken along the line BB of FIG. 1, FIG. 6 is a plan view of the same water metering valve, and FIG. 7 shows the performance of the embodiment of the present invention. The diagram shown in FIG. 8 is a diagram showing the performance of the prior application technique. 1: casing, 2: steam inlet, 3: cold liquid inlet, 4: mixing chamber, 5:
Mixed liquid outlet, 6: pressure sensitive chamber, 7: pressure sensitive moving element, 9: temperature sensitive moving element,
20: mixing pressure chamber, 21: diaphragm, 23a: ceiling wall, 24: biasing means, 37: valve seat hole, 38: valve seat, 39: valve spring, 40: pilot valve, M: valve opening mechanism, F : Pressure sensing chamber depth, R1, R2, R3: Pilot passage, L: Minute gap, V1: Steam inlet valve, V2: Differential pressure mechanism, V3:
Pilot valve.

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).
And a cooling liquid mixing chamber (4) at the cooling liquid inlet (3).
Is installed in the cooling liquid inlet (3) and the mixing chamber (4) and a differential pressure mechanism (V2) is generated between the cooling liquid inlet (3) and the mixing chamber (4). The differential pressure (ΔP) up to the pressure sensing chamber (6) for forcibly opening (V1)
A pilot valve (V3) for forming a minute gap (L) is provided in a part of the pilot passage (R1, R2, R3) for transmitting the valve, and a valve seat hole (37) is formed in the minute gap (L). Valve seat (3
8), a pilot valve (40) biased to the small side of the minute gap (L) in the valve seat (38), and a temperature-sensitive transfer element (9) for sensing the temperature of the mixed liquid. The size of the minute gap (L) is automatically reduced by the movement of the temperature-sensitive moving element (9) on the high temperature side and is automatically increased by the movement of the temperature-sensitive moving element (9). Mixing valve device characterized in that it is associated with a child (9).