JPS5953452B2 - instant water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a stop-start instantaneous water heater that can adjust the temperature of hot water from a low temperature to a high temperature using a hot water faucet.

The water temperature in conventional stop-start instant water heaters is controlled by changing the flow rate of water using a hot water temperature control knob on the device. When you try to do so, the ignition water pressure automatically increases and the water pressure reaches 1 kg/
In areas where the water is relatively low (cm or less), the ignition water will be extinguished, and the ignition water volume is generally set high (5 to 71/min for a No. 10 water heater), so if you reduce the ignition water volume below the ignition water volume with a stop faucet, the fire will be extinguished in the same way. Therefore, in the past, the stop faucet was only opened and closed, and the temperature of the hot water was adjusted using a temperature control valve installed in the appliance.

As a result, with a stop-start water heater, you have to go to the appliance every time to adjust the water temperature, which is a hassle, and when using a hot water mixer faucet, the water pressure on the water side causes the fire to go out. There were many phenomena in which the temperature of showers, etc., was particularly difficult to control.

In addition, in a conventional configuration in which the main water passage passing through the heat exchanger is made thinner to suit the amount of water at the time of the maximum temperature rise, and a bypass passage of the heat exchanger is provided to increase the amount of water, similarly, the temperature The temperature of the hot water was controlled by changing the amount of water in the bypass passage using a control faucet, and it was not possible to adjust the temperature using a stop faucet.

In the present invention, an automatic opening/closing valve is provided in the bypass passage of the heat exchanger, thereby making it possible to adjust the temperature at the stop faucet.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, Figure 1 only shows the water circuit of an instantaneous water heater.
Water controller 1, water supply piping 2, heat exchanger 3 that absorbs heat and obtains hot water
, and a hot water supply pipe 4.

The water controller 1 is formed by a main body 5, a cap 6, and 7, 8 is a water inlet, 9 is a water outlet, 10 is a water pipe, 1
1 is a hot water pipe, 12 is a hot water inlet of the main body 5, and 13 is a hot water outlet.

The water controller 1 includes a governor section 14 and a water pressure response section 15, a governor actuator 17 that operates following the governor diaphragm 16, its valve seat 18, a water controller primary chamber 19, an atmospheric pressure chamber 20, A governor portion 14 is formed by a governor spring 21 that counters the force of the diaphragm 16, and a water controller secondary chamber 2 is divided by a hydraulic responsive diaphragm 22.
3, a low pressure chamber 24, a low pressure introduction hole 25.2, an orifice 26 provided between the firebox 23 and the low pressure introduction hole 25 form a hydraulic response section 15, and 27 is an operating frame linked to a gas valve.

Further, a bypass water passage 28 is formed which directly connects the second firebox 23 to the hot water outlet 13, and a bypass on-off valve 29 provided on the hot water outlet side, a valve seat 30 thereof, and a bypass on-off valve 29 attached to the valve seat 30 are formed in the middle. Spring 3 that acts in the direction of force
1. The spring receiver 32 forms an automatic bypass valve.

33 is a hot water mixing section of the main water passage 34 passing through the heat exchanger 3 and the bypass water passage 28.

In addition, 35 is the main faucet in the water supply pipe 2, and 36 is the hot water supply pipe 4.
It is a stop faucet installed at the end of the faucet.

Next, the operation will be explained.

When water is gradually supplied by gradually opening the main faucet 35 with the stop faucet 36 open, water flows from the water inlet 8 of the water controller 1 to the first firebox 19 of the governor section 14, the secondary chamber 23, and so on. Water is supplied to the heat exchanger 3 through the water outlet 9, during which a pressure difference is generated before and after the orifice 26, and the pressure difference between the two fire chambers 23 and the low pressure chamber 24 is increased by the diaphragm 22, and a predetermined amount of water flows. Through the operation frame 27, a hydraulically responsive gas valve (not shown) in the gas circuit opens, and the burner combusts.

The hot water that has absorbed heat in the heat exchanger 3 is transferred to the hot water pipe 115 main body 5
Bath bath room 12. Hot spring bath 13. Hot water is supplied from the stop faucet 36 through the hot water supply pipe 4.

At this time, the bypass passage 28 is closed by the bypass opening/closing valve 29 until a predetermined flow rate flows into the main water passage 34, but the maximum temperature rise water amount in the heat exchanger 3 (No. 8 hot water In a boiler, when a water flow rate of 3.61/min or more at 55 degrees flows, the differential pressure across the bypass on-off valve 29, that is, the pressure difference between the two fire chambers 23 and the hot water mixing section 33 increases.
The bypass opening/closing valve 29 is opened against the force of the bypass valve spring 31, and the bypass flow flows, joining the hot water from the main water passage 34 in the mixing section 33, and hot water is supplied.

After the bypass on-off valve 29 is opened, the bypass flow rate changes depending on the water pressure in the second firebox 23, and at the same time, the degree of opening of the bypass on-off valve 29 and the valve seat 30 changes as well. As a result, the pressure difference between the secondary chamber and the mixing chamber 33 is always kept constant, and the flow rate of the main water passage 34 increases less than the water pressure of the secondary fire chamber 23 from the time when the bypass flow starts flowing. The saturation flow rate is reached by the time the bypass on-off valve 29 is fully opened (the main water passage is 3.6
When the valve starts to open at 1/min, the saturated flow rate is 4 to 4.51/min, depending on the setting of the spring 31).

The flow characteristics in this state are shown in FIG.

2 firebox 23°, that is, as the water pressure increases at the water inlet 8, the water flows to the main water flow rate 34 up to point a, and thereafter the bypass on-off valve 29
When the valve is opened, the flow rate shown in region B flows as a bypass flow rate, and the main passage flow rate has a characteristic that is constant at the flow rate shown at point b.

Next, in normal use, water pressure is applied all at once, so the main water passage 34 and the bypass water passage flow almost simultaneously with the characteristic distribution shown in FIG. 2.

Furthermore, in the pre-stop type, the main faucet 35 remains open and the pre-stop faucet 3
In this case as well, the hydraulic responsive diaphragm 22 and the bypass on-off valve 29 operate according to the flow rate according to the opening degree of the stop faucet 36, regardless of the level of the inlet water pressure. Therefore, the flow rate distribution characteristics shown in FIG. 2 are obtained.

Therefore, if the stop faucet 36 is now fully open and the flow rate is gradually reduced, the flow rate of the heat exchanger will hardly change as the flow rate of hot water decreases from point 0 to point a, and only the bypass flow rate will change. Since it is variable, the maximum temperature rise of the main water passage 34 is maintained continuously, and during this time, the temperature can be adjusted using a stop faucet without causing boiling inside the heat exchanger.

In conventional appliances, the temperature is controlled by a manual control valve installed in the bypass passage, and in a configuration without a bypass passage, two fireboxes 23 are used.
Temperature is controlled by a manual control valve provided between the low pressure introduction holes 25, and the flow rate characteristics when there is a bypass passage when the temperature control valve is fully opened and adjusted by a stop faucet are shown in FIG.

If ignition occurs when the flow rate shown at point X in the main water passage passing through the heat exchanger in Figure 3 flows, the total hot water flow rate will be the flow rate shown at point y, and if the hot water flow rate is throttled to below y. Since the heat exchange flow rate will inevitably fall below X, the fire will be extinguished, and the flow rate adjustment range with the stop faucet is extremely narrow, from C to 7, and the problem is that if you reduce the flow rate even a little, the fire will extinguish immediately. In reality, it was not possible to adjust the temperature using the stop faucet.

Therefore, the temperature was controlled by adjusting the bypass flow control valve installed in the equipment from C or y to the flow level of X, so that even if the hot water flow rate decreased, the heat exchange flow rate did not decrease. .

Similarly, even in a configuration without a bypass passage, the amount of ignition water is large when the flow control valve is fully open, so the temperature is controlled using the control valve installed in the device in such a way that the differential pressure does not decrease even if the flow control valve is throttled down. .

In the present invention, if the ignition water amount is set to X in FIG. 2, the flow rate of hot water can be adjusted from c to X using the first stop faucet, and the temperature can be adjusted only by the first stop faucet.

At the same time, it is also possible to form a flow rate control valve on the downstream side of the hot water mixing section 33 and adjust the flow rate using a temperature control knob provided on the device.

Note that the governor action in the governor section 14 is the same as in the conventional case, and although a detailed explanation will be omitted, even if the water pressure in the inlet section 8 increases and the water pressure in the first firebox 19 increases, the force of the diaphragm 16, Governor spring 21, actuator 17, valve seat 1
Due to the action of 8, the water pressure immediately returns to the specified level, and 1 firebox 1
9 always maintains stable water pressure, and 1 shown in Figure 2.
The flow rate level of kg/cm2 is always maintained unchanged even under high water pressure.

As described above, according to the present invention, the following excellent effects can be expected.

■ With pre-stop water heaters, the water temperature can be adjusted from low to high temperatures using the pre-stop faucet, unlike conventional water heaters.
There is no need to go to the trouble of going back to the appliance to adjust the temperature.

Further, in the case of the present invention, if the appliance is provided with a temperature control line, it becomes possible to use the appliance in the conventional manner and to control the temperature using a stop faucet, further improving usability.

II. In some cases, external lid-type water heaters are equipped with a remote control dedicated to temperature adjustment in order to enable indoor operation, but with the present invention, the temperature can be adjusted with a stop faucet, so outdoor adjustment and remote control are not required. becomes.

III By providing a simple automatic bypass valve,
Temperature controller plugs are not required, and the overall structure is simple and inexpensive.

IV Since the water always flows only through the main water passage up to the ignition water pressure, the ignition water pressure can be lowered compared to conventional products, and conversely, if the same level of performance is achieved, the dimensions of the water controller, heat exchanger, etc. can be made smaller and more compact.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an instantaneous water heater showing an embodiment of the present invention, and FIGS. 2 and 3 are flow characteristic diagrams. 3...Heat exchanger, 28...Bypass water passage, 29...Bypass flow rate automatic opening/closing valve, 34
...Main waterway.

Claims (1)

[Claims] 1. A main water passage passing through the governor section, the orifice or venturi, the heat exchanger, and the outlet, and a bypass passageway for the heat exchanger that branches from between the governor section and the orifice or venturi and leads directly to the outlet. An instantaneous water heater having a bypass flow rate automatic opening/closing valve in a water passageway that opens when the flow rate through a heat exchanger exceeds a predetermined flow rate and controls opening/closing based on the pressure difference between the upstream side and the downstream side of the heat exchanger.