JPH086193Y2 - Water heater - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for simultaneously setting a hot water outlet temperature, a hot water discharge amount, and a bypass water amount by a single operation knob.

[0002]

2. Description of the Related Art In a conventional water heater, a water synchro equipped with a flow rate adjusting valve for adjusting a flow rate, as shown in FIG. 7, adjusts a flow rate in which a passage area is variable in a water supply pipe 3 of a constant flow valve V _1. The valve 6 is provided, and the operation knob 9 connected to the operation shaft 9a of the flow rate adjusting valve 6 is operated to adjust the amount of hot water. Incidentally, 1 is an endothermic fin, 5 is a gas burner, and S is a thermistor. Further, in the same circuit configuration as described above, further, as shown in FIG. 8, a bypass pipe 10 is provided between the tubes 2 in the heat exchanger A so as to prevent drainage in the heat exchanger A. There was a water heater.

[0003]

In the above-mentioned prior art, since the former has a straight circuit configuration, it is difficult to suppress the generation of drainage when the hot water temperature of the heat exchanger A becomes low. .

In the latter case, the bypass pipe 1 is provided in the middle of the tube 2 even when the hot water temperature of the heat exchanger A becomes low.
Since water is introduced from 0, the heat exchanger A does not fall below the drain generation temperature and drain generation is prevented, but when the hot water outlet temperature is set to a high temperature, the mixing ratio of the bypass pipe 10 is fixed. Therefore, the inside of the heat exchanger A may be boiled.

Therefore, an object of the present invention is to make the outlet temperature stable in a wide range from a low temperature to a high temperature by making the set temperature, the amount of flowing water, and the amount of bypass water simultaneously variable, thereby generating drainage and boiling in the heat exchanger. It is to provide a water heater that prevents

[0006]

In order to solve the above-mentioned problems, a water heater according to the present invention is provided with a temperature control volume for setting a hot water outlet temperature, a flow rate control valve for controlling a flow rate to a constant flow valve, and a bypass water amount. A bypass mechanism is formed so that it can be interlocked with a mixing mechanism that adjusts the temperature, and the bypass passage communicates with the middle part of the heat exchanger, enabling simultaneous control of hot water temperature, hot water amount, and bypass water amount by turning a single operating knob. It is configured as follows.

[0007]

[Function] By rotating the operation knob, the electric resistance of the temperature control volume is changed to set the hot water temperature, and the flow control valve is opened / closed to change the maximum amount of water flowing into the heat exchanger. When setting, the amount of water input is small, and when the temperature is low, the amount of water input is large.At the same time, the mixing mechanism opens and closes to change the amount of bypass water. At times, the amount of bypass water increases to prevent drainage.

[0008]

EXAMPLES The structure of the water heater of the present invention will be described below by way of examples. FIG. 1 is a schematic circuit diagram of a water heater, in which A is a fin-and-tube type heat exchanger in which a number of endothermic fins 1 are inserted into endothermic tubes 2. Side is connected to a water supply pipe 3 and outlet side is connected to a hot water discharge pipe 4, and a gas burner 5 provided at the lower part of the heat exchanger A heats the heat exchanger A to discharge hot water from the hot water discharge pipe 4. ing.

In the water supply pipe 3, a flow rate control valve 6 that adjusts the flow rate to the constant flow valve V ₁ , and a temperature control volume 7 that controls the opening / closing degree of the gas solenoid valve V ₂ to set the hot water temperature. ,
Mixing mechanism 8 for adjusting the amount of bypass water, and those
An operation knob 9 for operating is provided. Further, a bypass pipe 10 branched from the mixing mechanism 8 communicates with an intermediate portion of the tube 2 of the heat exchanger A, and a thermistor S is provided at a downstream point of the heat exchanger A in the hot water discharge pipe 4.

The details of the constant flow valve V ₁ , the flow rate control valve 6, the temperature control volume 7, and the mixing mechanism 8 are configured as follows. That is, as shown in FIG. 2, the first valve chamber 6b communicates with the water inlet 6a connected to the water supply pipe 3, and
The upper part and the lower part of the second valve chamber 6c communicate with the upper part and the lower part of the valve chamber 6b, respectively. The spindle assembly 6e
A spring 6f for urging the spring 6f upward, a thermoelement 6g for pressing the spring 6f, and the like are provided.
A mixing throttle shaft 8a, which is a component of the mixing mechanism 8 that controls the flow rates to the first valve chamber 6b and the bypass pipe 10, is provided above the second valve chamber 6c.

Further, the second valve chamber 6 in the first valve chamber 6b
A constant flow valve V _{1 including a} third valve chamber 11a, a metering valve assembly 11b housed in the third valve chamber 11a, and a spring 11c for urging the metering valve assembly 11b downward is provided on the opposite side of c. Opening hole 11 of 3 valve chamber 11a
d communicates with the bypass pipe 10 via the mixing throttle shaft 8a in the upper part of the second valve chamber 6c, and the opening holes 11e communicate with the water outlet 11f, respectively, and the opening hole 11f of the water outlet 11f.
g communicates with the water supply pipe 3 that is connected to the inlet side of the tube 2.

Further, as shown in FIG. 3, the mixing throttle shaft 8a is screw-fitted and integrated with a water synchro shaft 6i for opening and closing the flow control valve 6, and a temperature control volume is provided on the water synchro shaft 6i. 7, the volume assembly 7b in the volume cover 7a is screw-fitted and integrated, and the operation shaft 9a with the operation knob 9 is coupled to the volume assembly 7b. The operation knob 9, the operation shaft 9a, the volume assembly 7b, the water synchronizing shaft 6i, and the mixing diaphragm shaft 8a are the same shaft, and are formed so that they can be simultaneously interlocked by the rotation of the operation knob 9. In addition, the temperature control volume 7 has an operating shaft 9
By rotating a, the volume (electrical resistance value of the controller, the same applies hereinafter for the main portion) is made variable, and the amount of flowing water becomes smaller as the set temperature becomes higher.

According to the structure of this embodiment, the water in the water supply pipe 3 flows from the water inlet 6a to the first valve chamber 6b as shown by the arrow in FIG.
The variable valve 6d, which is opened and closed by the operation of the thermo element 6g and the spring 6f
Is controlled to flow into the third valve chamber 11a, and the other flows into the first valve chamber 6b again via the mixing throttle shaft 8a above the second valve chamber 6c, and further flows into the third valve chamber 11a. Third
The water that has flowed into the valve chamber 11a is supplied to the water inlet 6a and the third valve chamber 11a.
Controlled by a metering valve assembly 11b that opens and closes by a spring 11c that operates according to the pressure difference with a, and flows into the bypass pipe 10 from the opening hole 11d through the mixing throttle shaft 8a in the upper part of the second valve chamber 6c, The water flows into the water outlet 11f from the opening 11e, and further flows into the water supply pipe 3 connected to the inlet side of the tube 2 from the opening 11g.

Therefore, when the operation knob 9 is rotated to a desired angle, the volume assembly 7b connected to the operation shaft 9a, the water synchronizing shaft 6i and the mixing diaphragm shaft 8a are simultaneously rotated at the same angle, and the temperature control volume is adjusted. The volume of 7 changes and the opening temperature of the gas solenoid valve V ₂ is adjusted to set the hot water discharge temperature. At the same time, the opening of the flow rate control valve 6 is adjusted to change the flow rate according to the opening degree. Adjust the hot water temperature to the set temperature according to. That is, the maximum amount of water flowing into the heat exchanger changes, the amount of water input is small when the temperature is set to high, and the amount of water input is increased when the temperature is set to low.

At the same time, the mixing mechanism 8 is opened and closed to change the amount of bypass water, and when the hot water outlet temperature is high, the amount of bypass water decreases (or is set to zero), and the amount of water flowing directly from the water supply pipe 3 into the tube 2 increases. In addition, the boiling of the exchanger A is prevented, and when the hot water temperature is low, the amount of bypass water is increased, and the amount of water flowing into the tube 2 directly from the water supply pipe 3 is reduced to prevent drainage of the heat exchanger A. .

FIG. 4 is a graph showing the relationship between the set temperature when mixing the water heater and the hot water temperature in each tube. The arrangement of the tube and bypass pipe in this case is shown in FIG.
In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The eight tubes a to h are arranged so as to meander between the heat supply fins 1, and the bypass tube 10 is connected between the seventh tube and the eighth tube h.

If the water temperature is 5 ° C, the set temperature is 37 ° C.
When mixing is performed, the hot water temperatures of the tubes a to g rise respectively and the hot water temperature of the tube g becomes about 54 ° C., but the flow rate of water from the bypass pipe 10 to the tube h decreases, and conversely to the tube a. Tube h
The hot water temperature of about 54 ° C. suddenly drops to about 34 ° C., and the hot water discharge temperature reaches about 37 ° C., which prevents the occurrence of drainage. Also, when mixing is performed by setting the set temperature to 75 ° C., the hot water temperature of the tube g becomes about 68 ° C., but the flow rate of water from the bypass pipe 10 to the tube h is reduced, and conversely the tube a
On the contrary to the above case, the hot water temperature of the tube h hardly decreases, the hot water discharge temperature becomes about 75 ° C., and there is no fear of boiling.

FIG. 6 is a graph showing the relationship between the turning angle of the operation knob 9, the mixing opening, and the hot water temperature. When the operation knob 9 is set to the scale 1, the hot water temperature is 37 ° C., and the operation knob 9 is set to the scale. When the scale is set to 3 by turning 1 to 100 degrees, the hot water temperature becomes 47 ° C. During this time, the mixing mechanism is open. Further, when the operating knob 9 is turned by 150 degrees from the scale 3 to the scale 6, the tap water temperature becomes 75 ° C. During this time, the mixing mechanism is fully closed.

The constant flow valve V ₁ , the flow rate control valve 6, the temperature control volume 7, and the mixing mechanism 8 in the above embodiment.
The shape and the configuration of the details of the above are examples, and the present invention is not limited to this and can be appropriately changed without departing from the purpose and the purpose of the present invention.

[0020]

[Effects of the Invention] As described above, the water heater of the present invention includes a temperature control volume, a flow rate control valve to a constant flow valve, and a mixing valve .
And operatively forming a ring mechanism, by these rotating the single operation knob, without the set temperature and the water flow rate and inversely proportional to the variable, in particular, a large amount of hot water is obtained at a low temperature setting The capacity of the heat exchanger is changed, and at the same time, the amount of water in the bypass passage communicating with the middle part of the heat exchanger is changed to prevent drainage of the heat exchanger, which tends to occur during low temperature hot water discharge, and also to prevent boiling during hot water discharge. It can be prevented. In this way, the hot water temperature, hot water amount, and bypass water amount can be controlled simultaneously with a single operation knob, which is convenient and easy to use.
Since the generation of drain is prevented, the durability of the heat exchanger is improved and its practical value is increased.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

2 is a partial vertical cross-sectional view of a constant flow valve V ₁ , a flow rate control valve 6, a temperature control volume 7 and a mixing mechanism 8 of FIG.

FIG. 3 is a side view showing a cross section of a main part of FIG.

FIG. 4 is a graph showing the relationship between the set temperature during mixing and the hot water temperature in each tube.

FIG. 5 is an explanatory diagram showing an arrangement state of tubes and bypass pipes when the graph of FIG. 4 is obtained.

FIG. 6 is a graph showing the relationship between the turning angle of the operation knob, the mixing opening, and the hot water temperature.

FIG. 7 is a circuit configuration diagram showing an example of a conventional water heater.

FIG. 8 is a circuit configuration diagram showing another example of a conventional water heater.

[Explanation of symbols]

6 ・ ・ Flow control valve, 7 ・ ・ Temperature control volume, 8 ・ ・ Mixing mechanism, 9 ・ ・ Operation knob, 10 ・ ・ Bypass pipe,
A ... Heat exchanger, V ₁ ... Constant flow valve.

Claims (1)

[Scope of utility model registration request] 1. A temperature control volume for setting a hot water temperature,
A flow rate control valve that regulates the flow rate to the constant flow valve and a mixing mechanism that regulates the amount of bypass water are formed so as to be interlocked , and the bypass passage is connected to the middle part of the heat exchanger so that a single operation knob can be turned. A water heater characterized by enabling simultaneous control of hot water temperature, hot water amount, and bypass water amount.