JPS5852111B2 - hot water mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water mixing device in a mixing type water heater that mixes hot water and cold water to obtain desired hot water.

Conventionally, a mixing valve chamber has a hot water side seat part corresponding to a hot water side single-sided valve and a water side seat part corresponding to a water side single-sided valve, and the movement toward and away from each valve and the corresponding seat part is in an inverse relationship to each other. A two-valve, two-seat hot water mixing device with this configuration is well known, but in actual use, the set boiling temperature cannot be maintained because the amount of water flowing exceeds the heating capacity of the water heater, which poses a practical problem. Ta.

Next, a conventional example will be explained with reference to FIG.

Single-sided valve 2 on the hot water side fixed to the valve stem 1 at a certain interval
' and the water side single-sided valve 4' are inserted into the valve chamber and the hot water supply path 8 is opened.
The hot water side sheet 6' provided at the outlet of the water supply channel 12 and the water side sheet 10' provided at the outlet of the water supply channel 12 are arranged in correspondence with each other.

The other end of the valve shaft 1 is connected to a servo motor M, and when the servo motor M is rotated to a desired angle, the two valves 2/ are connected by a threaded portion 16.

4' move forward and backward to adjust their respective opening degrees in inverse proportion to each other.

13 is a hot water outlet, 14 is a heat exchanger for a water heater, and 15 is a pressure reducing valve installed in a water conduit.

Therefore, if the single-sided valve 2' on the hot water side and the single-sided valve 4/on the water side are moved from the left end to the right, the temperature of the hot water will gradually rise, but the amount of hot water in the hot water supply pipe 8 will increase, exceeding the heating capacity of the water heater. There was a drawback that the hot water could flow from a certain point, making it impossible to obtain high-temperature hot water.

In order to correct the above-mentioned conventional drawbacks, this invention divides the valve chamber into a hot water side valve chamber and a mixing chamber, and provides first and second hot water side sheets on the hot water supply side and mixing chamber side of the hot water side valve chamber. In addition, a valve shaft that moves forward and backward with an arbitrary drive means is inserted into the valve chamber, which has one water side seat on the water supply side of the mixing chamber, and a hot water side double-sided valve having a throttle through hole in the valve shaft corresponds to the hot water side seat. At the same time, the single-sided valve on the water side corresponding to the water side seat is movable only in the direction approaching the double-sided valve on the hot water side, and a spring is interposed between the two valves to bias them in the direction away from each other, and the valve stem is With the double-sided valve on the hot water side in contact with the seat on the first hot water side, the single-sided valve on the water side sets the water side seat in the fully open position, and the valve shaft is moved back to move the double-sided valve on the hot water side to the first and second hot water sides. The hot water side opening is maximized at the middle position of the seat, and the water side opening is halved with the water side single-sided valve, and both valves are moved back to reduce the second hot water side seat opening, and the water side seat is reduced with the water side single-sided valve. After the water side seat is closed, the hot water side double-sided valve is placed in contact with the second hot water side seat against the spring. This prevents the flow of water that exceeds the capacity and ensures a stable supply of hot water at all times.

An embodiment of the present invention will be described below based on the drawings.
In FIG. 1, a valve shaft 1 is driven by a servo motor M to move forward and backward.

Reference numeral 2 denotes a double-sided valve on the hot water side for adjusting the amount of high-temperature hot water.

Reference numeral 4 designates a single-sided valve on the water side that adjusts the amount of cold water, and a spring 5 is interposed between it and the double-sided valve 2 on the hot water side to bias it in the direction of separation. It is only possible to move.

Further, 6 is one of the first hot water side sheets formed at the outlet of the hot water supply path 8 in the hot water side valve chamber 7, and 9 is a first hot water side sheet formed in the hot water side valve chamber 7 opposite to the first hot water side sheet 6. The other second hot water side seat 9 is disposed between the hot water side valve chamber 7 and a mixing chamber 11 to be described later.

The hot water side double-sided valve 2 is installed between these two hot water side seats 6.9, and the hot water side double-sided valve 2 is installed by moving the valve shaft 1 back and forth.
The two hot water side sheets 6.9 are brought into contact with and separated from each other in an inverse relationship so that the respective opening degrees can be adjusted.

10 is a water supply channel 12 in the mixing chamber 11 which also serves as a water side valve chamber.
A water-side seat is formed at the outlet of the water-side seat 10, and the water-side single-sided valve 4 approaches and separates from the water-side seat 10 by moving forward and backward of the valve shaft 1 to change and adjust its opening degree.

Components with the same reference numerals as those in the detailed drawing 5 indicate the same components, and description thereof will be omitted.

This invention is constructed as described above, and its operation and effects will now be explained. In the state shown in FIG. contacts the first hot water side sheet 6 and closes the hot water supply path 8, and a small amount of high-temperature hot water from the hot water supply path 8 flows into the mixing chamber 11 only through the throttle hole 3 bored in the double-sided valve 2 on the hot water side.

On the other hand, the water-side single-sided valve 4 is optically separated from the water-side seat 10 and its opening degree is maximum, allowing a large amount of cold water from the water supply channel 12 to flow into the mixing chamber 11 to produce hot water at the lowest temperature. state.

Next, in FIG. 2, the valve stem 1 is moved to the right from the state of A, and the hot water side double-sided valve 2 is positioned between the first and second hot water side seats 6.9. Maximize the opening of B and at the same time reduce the opening of water side single-sided valve 4 by half.
In this state, the hot water temperature is gradually increased to a state of higher than LB, and hot water is discharged at a medium temperature.

Furthermore, move the valve stem 1 further to the right, and then move the hot water side double-sided valve 2
is brought closer to the second hot water side seat 9 and its opening degree is reduced to J~, and the water side single-sided valve 4 is brought into contact with the water side seat 10 to be fully closed, resulting in state C.The hot water outlet temperature is further raised to state C. This produces the hottest hot water.

Here, if the amount of hot water that comes out is large and exceeds the capacity of the water heater and passes through the heat exchanger 14 of the water heater, the temperature of the hot water that comes out will drop, so the positions of both valves 2 and 4 will shift to the state described later. do.

In Fig. 2, the valve stem 1 is moved further to the right and the hot water side double-sided valve 2 is moved against the spring 5 (by compressing the spring 5).
If the hot water side sheet 9 is contacted and closed, and the water side sheet 10 is also kept fully open to achieve state D, the amount of hot water supplied only from the throttle hole 3 will be constant due to the pressure regulating action of the pressure reducing valve 15. Maintain the required maximum temperature of hot water by keeping the minimum amount.

Even between state A and state B described above, if the amount of hot water that comes out is large and exceeds the capacity of the water heater, and the amount of water that exceeds the capacity of the water heater passes through the heat exchanger 14 of the water heater, the temperature of the hot water that comes out will drop, so both valves 2,
The equilibrium position of 4 shifts from state B to state C.

Figure 3 is a graph showing the above relationship, that is, the stroke of the valve stem 1 and the passage cross-sectional area of cold water and high-temperature water. It has been shown that it can be secured.

Here, it can be seen that between states A→C, the stroke and the resulting mixed water temperature have a smooth rising curve, and in states C-)D, a constant maximum temperature can be obtained.

In addition, Fig. 4 shows a case where the double-sided valve 2 on the hot water side does not have the restricting hole 3, but if the mixed hot water temperature is lower than the set hot water temperature in this case, the double-sided valve 2 on the hot water side will also move to the right as described above. It moves in the direction to narrow the opening, and in the opposite case it moves in the opposite direction.

Therefore, when the sensed temperature is extremely low compared to the set temperature, the rightward energy of the servo motor M usually becomes large, so it overstrokes and becomes fully closed as shown in the figure. The detection source by the temperature sensor remains low and the situation does not recover.

That is, there is a drawback that the mixer becomes locked and automatic temperature control of mixing becomes impossible.

The example of mixing using the servo motor M has been shown above, but
It is also applicable to mixing driven by a linearly moving solenoid or manually operated.

As explained above, this invention uses a 2-valve, 3-seat system and has a restrictor hole in the double-sided valve on the hot water side, so the water heater heats up faster than the conventional 2-valve, 2-seat system. By suppressing the flow of water that exceeds the capacity, there is no need for the hot water temperature to drop unexpectedly or to be unable to obtain hot water as in the conventional case, and the lift amount (stroke) of the two valves and the hot water temperature are smooth rising curves. It has the excellent effect of being able to always obtain hot water at a stable set temperature and achieve good mixing.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view showing one embodiment of the present invention, and FIG.
Figures A-D are cross-sectional views showing the operating state of the main parts, Figure 3 is a graph showing the relationship between the passage cross-sectional area of the valve and the stroke, and Figure 4 is a cross-sectional view showing an example of the valve without a restriction hole. , 5th
The figure is a sectional view of a conventional example. 1...Valve stem, 2...Hot water side double-sided valve,
3... Throttle hole, 4... Water side single-sided valve, 5... Spring, 6... Hot water side seat,
γ...Hot water side valve chamber, 8...Hot water supply path, 9.
...Hot water side sheet, 10...Water side sheet,
11...Mixing chamber (water side valve chamber), 12...
・Supply waterway, 13...Mixed hot water outlet, 14...
... Heat collector, 15 ... Pressure reducing valve, M ...
·Servomotor.

Claims (1)

[Claims] 1. Insert a valve shaft that moves forward and backward using any driving means into a valve seat that has first and second hot water side seats on the hot water supply side and mixing chamber side, and one water side seat on the water supply side of the mixing chamber. A double-sided valve on the hot water side having a throttle through hole in the valve shaft is fixed in correspondence with the hot water side seat, and a single-sided water valve corresponding to the water side seat is provided so as to be movable only in the direction of the double-sided valve on the hot water side. With a spring biased in the direction of separation between them, the valve stem is advanced, and the hot water side double-sided valve is in contact with the first hot water side seat, and the water side single-sided valve is in the fully open position with the water side seat. By retracting the shaft, the hot water side double-sided valve is placed between the first and second hot water side seats to maximize the hot water side opening, and the water side single-sided valve is used to reduce the water side opening by half, and then both valves are moved back to maximize the hot water side opening. The relationship is such that the opening of the second hot water side seat is reduced and the water side seat is fully closed with the water side single-sided valve, and after the water side seat is closed, the hot water side double-sided valve is brought into contact with the second hot water side seat against the spring. A hot water mixing device characterized by being placed at a certain position.