JP2937305B2 - Mixing valve with overall flow control function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing valve capable of mixing two fluids in proportion and simultaneously adjusting the total outflow of the mixed fluids.

[0002]

2. Description of the Related Art In the case of an instantaneous water heater, when a tapping temperature is set, a controller 05 operates to maintain the tapping temperature as shown in FIG. The mixing ratio of the cold water from the bypass 02 and the bypass 02 is controlled by a bypass flow rate control valve 03, and the entire amount of tap water is controlled by a tap water quantity control valve 04.

[0003]

Therefore, the control valve 0
As for the motors 3 and 04, the driving motors are separately mounted, and the cost of one motor increases, and the control circuit of the controller 05 becomes complicated because two motors are individually controlled. There are drawbacks.

[0004] It is an object of the present invention to provide a mixing valve which can simultaneously control the mixing ratio and the overall flow rate with one motor.

[0005]

The structure of the mixing valve with an overall flow rate control function according to the present invention is as follows.

The interior is divided into an upper stage and a lower stage, and the upper stage is configured as a mixing chamber, and the lower stage is configured as a total flow rate control chamber, and an inlet for mixed fluid is formed on a side wall of the mixing chamber. A casing formed with a fluid outlet, a main shaft vertically inserted into the center of the mixing chamber and the total flow control chamber, the rotation of which is controlled by a motor, and the main shaft fixed to the main shaft in the mixing chamber. And a mixing closure having openings opposite to each other, and opposed to each other, and formed at an upper portion of the total fluid adjustment chamber and at a flow path portion following the mixing chamber. The orifice and an inner screw that is screwed into the feed screw formed on the main shaft. The orifice is externally displaced vertically along the main shaft by the action of the screw. A mixing valve having an overall flow rate control function, comprising: a needle valve configured to be able to freely enter and exit from below, and a guide for preventing rotation of the needle valve and supporting the needle valve so as to be slidable in the vertical direction. .

The orifice is vertically movably incorporated in the flow passage, and a water pressure adjusting spring for elastically supporting the orifice from the opposite side of the flow is incorporated to simultaneously adjust (absorb) fluctuations in water volume due to fluctuations in water pressure. ) May be configured.

Next, the needle valve is configured to rotate together with the main shaft and to be slidable in the vertical direction, and to drive the needle valve by screwing between the guide and the needle with a feed screw and an internal screw. May be.

[0009]

A separate fluid pipe is connected to each of the two inlets of the mixing chamber. The opening of the inlet is controlled proportionally by the rotation of a mixing shutter fixed to a main shaft rotated by a motor. Is done. As a result, the mixing ratio of the two fluids flowing into the mixing chamber changes. The mixed fluid passes through the orifice from the flow path, enters the total flow control chamber, and flows out of the casing through the outlet. When passing through this orifice, a needle valve is attached to the main shaft, the rotation of this needle valve is regulated, and the main shaft is screwed to the main shaft with a feed screw and an internal screw to allow vertical displacement, At the time of controlling the mixing ratio of the mixing closures, they are finely moved together by the action of a screw. However, this amount
Since the screw pitch is set to be small, it is almost negligible, so that the opening of the orifice hardly changes, and as a result, the overall flow rate reaching the outlet through the orifice is also almost zero. No change. As a result, it is possible to control only the mixing ratio side with one motor while controlling the overall flow rate to be substantially constant. The orifice is displaced by pressing the orifice with a spring so that when the water pressure of the mixed fluid increases, the orifice is displaced downward, the distance from the needle valve is reduced by this amount, and the opening area of the orifice is reduced. . As a result, an increase in the amount of water due to the increase in pressure is regulated, and the overall flow rate is stabilized irrespective of fluctuations in water pressure. When the water pressure decreases, the orifice rises in the opposite direction by the force of the spring, and the opening area of the orifice increases.

[0010]

FIG. 1 shows a cross section of a mixing valve according to the present invention.

Reference numeral 1 designates a casing constituting a main body of the mixing valve. A hot water inlet 4 and a cold water inlet 5 are formed on the side wall of the chamber, and a total fluid outlet 6 is formed below the total flow rate adjusting chamber 3.

Reference numeral 7 denotes a main shaft driven by a motor (not shown), which is vertically inserted into the center of the mixing chamber 2 and the total flow control chamber 3.

Numeral 8 designates a mixing closure, in the mixing chamber 2, fixed to the main shaft 7 and opposed to the hot water inlet 4 and the cold water inlet 5, respectively. Set slits 9, 10
Is a cylindrical type.

Reference numeral 11 denotes an orifice. The orifice 11 is supported in the flow path 13 by a spring 14 from the side opposite to the flow.

Reference numeral 15 denotes a needle valve. The needle valve 15 is provided in the orifice hole 12 of the orifice 11.
To the feed screw 16 cut in the main shaft 7 with an internal screw 17 and engaged with the guide 18 by the support ring 15 ′ to be displaced up and down to open the orifice hole 12. Control. 19 is a fluid passage, and 20 is an O-ring.

FIG. 2 shows an embodiment in which the mixing valve a according to the present invention is incorporated in the tapping temperature and total flow rate control valve of the instantaneous water heater, 21 is a heat exchanger, 22 is a bypass, and 23 is a heat exchanger 21. A side outlet 24 is a tap hole, a bypass 22 is connected to the inlet 5 of the casing 1, and an outlet 23 on the heat exchanger 21 side is connected to the inlet 4.

Hot water and cold water are supplied from the inlets 4 and 5 of the mixing chamber 2, and when the main shaft 7 is rotated by driving the motor, the opening area of the inlets 4 and 5 is changed proportionally by the rotation of the mixing closer 8. I do. As a result, the mixing ratio of hot water and cold water flowing into the mixing chamber 2 changes. The mixed fluid passes through the orifice hole 12 from the flow path, enters the total flow control chamber 3, and flows out of the casing 1 through the outlet 6. When passing through this orifice hole 12, the needle valve 1
The rotation of the needle valve 15 is regulated by the guide 18, and the needle valve 15 is slightly moved up and down by the action of the feed screw 16 and the inner screw 17. However, this amount is set small because the pitch of the screws 16 and 17 is set small.
Since the volume is almost negligible, the opening degree of the orifice hole 12 hardly changes, and as a result, the overall flow rate reaching the outlet 6 via the orifice hole 12 hardly changes. As a result, it is possible to control only the mixing ratio with one motor while controlling the entire flow rate to be constant. Then, when the water pressure of the mixed fluid increases, the orifice 11 is displaced downward by the water pressure, the distance from the needle valve 15 becomes closer by that amount, and the opening area of the orifice hole 12 is reduced. As a result, the increase in the amount of water based on the increase in pressure is controlled, and the overall flow rate is stabilized irrespective of fluctuations in the water pressure. When the water pressure decreases, the orifice 11 rises by the force of the spring 14, and the opening area of the orifice hole 12 automatically increases.

[0018]

As described above, according to the present invention, the mixing ratio and the overall flow rate can be controlled by one mixing valve, so that only one drive motor is required. As a result, the cost can be reduced and the control circuit can be simplified.

Further, by moving the orifice by water pressure and automatically changing the opening area of the orifice hole in relation to the needle valve, it is possible to obtain a mixing valve in which the total flow rate does not fluctuate by water pressure.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mixing valve according to the present invention.

FIG. 2 is a view showing an embodiment in which the present invention is incorporated in an instantaneous water heater.

FIG. 3 is an explanatory diagram of a control example of a tapping temperature and an overall flow rate of a conventional instantaneous water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Mixing room 3 Total flow control room 7 Main shaft 8 Mixing closing element 11 Orifice 15 Needle valve

Claims (3)

(57) [Claims] 1. An interior is divided into an upper stage and a lower stage, an upper stage is configured as a mixing chamber, and a lower stage is configured as a total flow rate adjustment chamber, and an inlet for a mixed fluid is formed on a side wall of the mixing chamber, respectively. A casing formed with a total fluid outlet, a main shaft vertically inserted into the center of the mixing chamber and the total flow control chamber, and controlled to rotate by a motor, and fixed to the main shaft in the mixing chamber. A mixing closet with a slit, which is opposed to the inlet of the mixed fluid, and has an opening set to be opposite to each other, and a flow which is an upper part of the total fluid adjusting chamber and which is continuous with the mixing chamber. An orifice formed in a road portion, and an outer screw is provided on the main shaft by an internal screw screwed to a feed screw formed in the main shaft, and the action of the screw vertically moves along the main shaft. A needle valve configured to freely move in and out of the orifice from below, and a guide that prevents rotation of the needle valve and supports the needle valve so as to be slidable up and down. Mixing valve with function. 2. The mixing device with an overall flow rate control function according to claim 1, further comprising a water pressure adjusting spring for resiliently supporting the orifice from the opposite side of the flow, and incorporating the orifice so as to be vertically movable in the flow path. valve. 3. The overall flow rate according to claim 1, wherein the needle valve is rotated together with the main shaft and slidably mounted in a vertical direction, and the guide and the needle valve are screwed together with a feed screw and an internal screw. Mixing valve with control function.