JPH0660765B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a movable member that is displaced by the water supply pressure in a water supply state to a water heating heat exchanger, and supplies the movable member by mechanical interlocking with the movable member. The present invention relates to a hot water supply device in which a water pressure responsive valve that opens only when the water pressure is appropriate is arranged in series with an electromagnetic fuel valve in a fuel path to a main burner.

[Conventional technology]

Conventionally, a water pressure responsive valve that is opened only when the water supply pressure is appropriate by mechanical movement with a movable member that is displaced by the water supply pressure (for example, a diaphragm in a diaphragm type water governor interposed in the water supply passage) is used. As a hot water supply device of the above type, which is designed to prevent the so-called empty heating state,
There are some as shown in the figure.

In the hot water supply device shown in FIG. 3, (21) is an operation tool for starting and stopping hot water supply, (22) is a hot water tap, and (9) is a water governor (6) interposed in the water supply path (5).
Only when the water supply pressure is appropriate by mechanical interlocking with the diaphragm (6a) (that is, the movable member that is displaced by the water supply pressure in the water supply state to the heat exchanger (1)) via the interlocking rod (10). The water pressure responsive valve that is opened (12 ') is turned on by the hot water supply start operation in conjunction with the operation tool (21) and turned off by the hot water supply stop operation, (14') is When the micro switch (12 ') is turned on,
The fuel valve (8) is switched to the open state, the ignition device (13) is ignited for a predetermined time, and the micro switch (1
This is a controller that switches the fuel valve (8) to the closed state when 2 ') is turned off.

Further, (16 ') is a thermocouple heated by the combustion flame of the pilot burner (23), and (20') is a fuel valve (when the electromotive force of the thermocouple (16 ') is reduced to a predetermined value. This is an incomplete combustion prevention control unit that switches 8) to the closed state.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional device, the water supply pressure drops for some reason during combustion operation (during hot water supply operation) and becomes improper, which causes the water pressure responsive valve (9) to close and the main burner (2) to extinguish. After that, when the water supply pressure rises to the proper state again and the water pressure responsive valve (9) returns to open, the main burner (2) is burned by the fire transfer from the pilot burner (23).
Re-ignites to prevent live fuel release (fuel release without combustion) due to the return of the hydraulically actuated valve (9) when the main burner is in a fire extinguishing state.
Pilot burner (23) that can continue combustion regardless of whether the hydraulic pressure responsive valve (9) is closed (specifically, fuel should be supplied from the upstream side of the hydraulic pressure responsive valve (9) in the fuel passage (7). The equipment of the pilot burner) was essential.

Then, there is a problem that the operating cost is high due to the fuel consumption in the pilot burner (23).

An object of the first and second aspects of the present invention is to prevent a fuel discharge from being released by opening and returning a water pressure responsive valve without using a pilot burner, and to provide a pilot from a water heater of this type using a water pressure responsive valve. The point is that the burner can be omitted.

[Means for Solving the Problems]

The hot water supply device according to the present invention is characterized in that a movable member that is displaced by the water supply pressure in a water supply state to the water heating heat exchanger is provided, and is opened only when the water supply pressure is appropriate by mechanical interlocking with the movable member. In a configuration in which a water pressure responsive valve that is in a valve state is installed in a fuel path to the main burner in a state of being arranged in series with an electromagnetic fuel valve, valve opening / closing detection means for detecting opening / closing of the water pressure responsive valve, and Based on the combustion detection means for detecting the combustion of the main burner, the detection information of the valve opening / closing detection means and the detection information of the combustion detection means, the fuel valve is opened and the main valve is opened in accordance with the opening operation of the water pressure responsive valve. The ignition means of the burner is ignited, the closing operation of the water pressure responsive valve and the control means for closing the fuel valve upon detection of non-combustion by the combustion detection means are provided. A.

[Action]

That is, the fuel valve is opened, the ignition means is ignited, and hot water is supplied along with the opening operation of the water pressure responsive valve due to the water supply to the water heating heat exchanger. In addition, in the hot water supply state,
When it is detected that the hydraulic pressure responsive valve is closed due to the stop of water supply to the water heating heat exchanger or non-combustion of the main burner is detected, the fuel valve is closed to extinguish the fire.

Therefore, even when the water supply pressure drops in the hot water supply state and becomes improper, the fuel valve is closed based on the detection of the closing of the water pressure responsive valve by the valve opening / closing detection means as the water pressure responsive valve is closed. When the main burner is extinguished, the water supply pressure rises to the proper state again in that state, and the hydraulic pressure responsive valve opens again, the valve opening / closing detection means detects the opening of the hydraulic pressure responsive valve, and the detected information is displayed. Based on this, the control means can open the fuel valve and ignite the ignition means of the main burner to burn the main burner.

As a result, it is possible to prevent live fuel release due to the return of the water pressure responsive valve to the open state. Moreover, the so-called double seal due to the opening of the water pressure responsive valve and the closing of the fuel valve is provided not only when the water heater is not used. It can be realized even when the water supply pressure drops when the water heater is used.

〔The invention's effect〕

In short, according to the present invention, it is possible to prevent the raw fuel release due to the return opening of the hydraulic pressure responsive valve without using a pilot burner and to ensure safety, so that the pilot from this type of water heater using the hydraulic pressure responsive valve can be secured. Since the burner can be omitted, the fuel consumption can be reduced and the operating cost can be reduced by omitting the pilot burner as compared with the conventional device.

Moreover, not only when the water heater is not used, but also when the water supply pressure is reduced when the water heater is used, the double seal can be provided, so that the safety can be further improved.

〔Example〕

 Next, examples will be described.

FIG. 1 shows a device configuration of a pre-stop type gas instantaneous water heater which is an example of a water heater, (1) is a fin tube type heat exchanger,
(2) is a burner (main burner) that heats running water in the heat exchanger (1), and (3) is a hot water supply passage (4) from the heat exchanger (1).
It is a hot water tap that is connected to.

The water supply channel (5) to the heat exchanger (1) is equipped with a diaphragm type water governor (6), and the fuel channel (7) to the burner (2) is
An electromagnetic fuel valve (8) and a water pressure responsive valve (9) are arranged in series and interposed.

The water pressure responsive valve (9) is installed on the diaphragm (6) of the water governor (6).
a) By mechanical interlocking with the (movable member) via the interlocking rod (10), the water supply pressure in the state of water supply to the heat exchanger (1) (when the hot water tap (3) is opened and water is flowing) It is a valve that opens only when it is appropriate. Specifically, as shown in FIG. 2, it opens when the water supply pressure rises to a predetermined valve opening water supply pressure value (P ₁ ), and After the valve is opened, the interlocking relationship with the diaphragm (6a) is set so that the valve is closed when the supply water pressure drops to the lower limit supply water pressure value (P ₂ ).

The ignition / extinguishing operation mechanism is turned on / off by the switch operating piece (11) attached to the interlocking rod (10) according to the displacement of the interlocking rod (10) (that is, the displacement of the diaphragm (6a)). Is turned on when the water pressure responsive valve (9) is opened, and
Provided is a micro switch (12) as a valve opening / closing detecting means which is turned off when the water pressure responsive valve (9) is closed, and when the micro switch (12) is turned on, an electromagnetic fuel valve
The (8) is switched to the open state, and the ignition device (13) as the ignition means for the burner (2) (that is, the main burner).
(2) Ignition device that directly ignites) to start the ignition for a predetermined time, and a micro switch
A controller (14) is provided as a control means for switching the electromagnetic fuel valve (8) to a closed state when (12) is turned off.

That is, with this configuration, hot water supply is started by opening the hot water tap (3) and stopped by closing the hot water tap (3).

The ON / OFF of the micro switch (12) will be described in more detail. As shown in FIG. 2, when the hydraulic pressure responsive valve (9) is turned ON, the hydraulic pressure responsive valve (9) is opened. ON switch which is higher than the supply water pressure value (P ₁ ) by the set width (ΔP ₁ ) When the supply water pressure rises to the operating water pressure value (Pa) Micro switch
When (12) is turned on and then turned off when the water pressure responsive valve (9) is closed, the setting range (ΔP is smaller than the lower limit water pressure value (P ₂ ) at which the water pressure responsive valve (9) is closed. ₂ ) The off-action water supply pressure value (Pb) which is higher by ₂ ) is set so that the micro switch (12) turns off when the water supply pressure drops to the value (Pb). .

That is, with the above configuration, in addition to the simple start / stop of hot water supply described above, the following functions (a) to (e) are obtained.

(B) During the combustion operation (during hot water supply operation), the water supply pressure falls below the lower limit water supply pressure value (P ₂ ) for some reason and becomes improper, which causes the water pressure responsive valve (9) to close. After the burner (2) extinguishes, even if the water supply pressure rises back to the valve opening water pressure value (P ₁ ) and the water pressure responsive valve (9) returns to open,
Until the supply water pressure further rises and returns to the ON operation supply water pressure value (Pa), the micro switch (12) is turned off when the water pressure responsive valve (9) is closed and the valve is closed. The fuel passage (7) from the electromagnetic fuel valve (8) to the burner (2) is kept in a closed state, thereby preventing the fuel gas from being released due to the return of the hydraulic pressure responsive valve (9) to open.

(B) When the feed water pressure further rises from the state in (a) above and reaches the ON operating feed water pressure value (Pa), the micro switch (12) is turned on to open the electromagnetic fuel valve (8). The ignition device (13) is activated and the burner
(2) is re-ignited, whereby the combustion operation for hot water supply is automatically restarted after the water pressure responsive valve (9) returns to open.

(C) ON actuation water supply pressure value (Pa) that turns on the micro switch (12), backed up by the fact that the function (1) above prevents the release of fuel gas by returning the hydraulic pressure responsive valve (9) to open.
Is set higher by a set width (ΔP ₁ ) than the valve opening actuation water pressure value (P ₁ ) at which the water pressure responsive valve (9) opens.
When starting (13), make sure that the hydraulically actuated valve (9) is already in a completely open state, so that meaningless ignition operation from the stage where the hydraulically actuated valve (9) is not yet opened, In addition, avoiding the ignition operation that tends to cause an ignition error in the state where the water pressure responsive valve (9) is still incompletely opened, the power required for ignition is saved (the battery (15) is used as the power source. This is especially important for water heaters), and the ignition / ignition function is improved in terms of reliability and safety.

(D) As a step before the fuel gas generation release prevention by the function of (a) above, after the water pressure responsive valve (9) is closed due to the decrease in the water supply pressure, the water pressure responsive valve (9) is returned by the increase in the water supply pressure. Since the improper water supply pressure may last for a long time until the valve is restored, it is necessary to close the hydraulic pressure responsive valve (9) (specifically just before closing). Micro switch (1
By switching the electromagnetic fuel valve (8) to the closed state by turning off (2), the fuel passage (7) is connected to the electromagnetic fuel valve (8) and the hydraulically operated valve.
With (9), the state of double shutoff, that is, the double sealed state, is maintained, thereby ensuring the fuel shutoff and further improving safety.

(E) When the hydraulic pressure responsive valve (9) is closed, the micro switch (12) is turned off to switch the electromagnetic fuel valve (8) to the closed state, and the micro switch (12) is turned off. By setting the value (Pb) higher than the lower limit water pressure value (P ₂ ) at which the water pressure responsive valve (9) closes by the set width (ΔP ₂ ), the water pressure responsive valve (9) closes when the water supply pressure decreases. Whenever the valve is opened, the micro switch (12) is already turned off so that the electromagnetic fuel valve (8) is switched to the closed state in advance, whereby the closing timing of the water pressure responsive valve (9) is controlled. When the front-back relation with the OFF timing of the micro switch (12) is subtle and uncertain (for example, a water pressure responsive valve
Lower limit water pressure value and micro switch to close (9) (12)
When the design is set to the same value as the OFF operation feed water pressure value that turns off the fuel gas, the fuel gas live release, that is, the feed water pressure drop causes the water pressure responsive valve (9) to close and burner ( Although 2) was extinguished, the drop in the water supply pressure was just up to the lower limit of the water supply pressure value and the micro switch (12) did not turn off due to a timing error, and then the water supply pressure increased and returned to the water pressure. The fuel gas raw release caused by the return of the response valve (9) is reliably prevented.

On the other hand, in the figure, (16) is a first thermocouple as combustion detecting means heated by the combustion flame of the burner (2), and (17) is a combustion chamber (1
It is a second thermocouple that is heated by the high temperature and high pressure of 8). When incomplete combustion occurs due to oxygen deficiency, the electromotive force of the first thermocouple (16) decreases and the exhaust passage is clogged. If incomplete combustion occurs due to clogging of the exhaust passage, the combustion chamber (18)
The second thermocouple (17) is electromotively generated by the high temperature and high pressure.

The first and second thermocouples (16) and (17) are connected in series to the incomplete combustion detection circuit (19) in a state in which their positive electrodes are connected to each other or their negative electrodes are connected to each other, Then, in the combustion operation state, when the circuit voltage in the incomplete combustion detection circuit (19) drops to the set lower limit value, in other words,
When the electromotive force of the first thermocouple (16) itself has dropped to a predetermined value without the electromotive force of the second thermocouple (17), or
When the electromotive force of the first thermocouple (16) is canceled by the electromotive force of the thermocouple (17) and the electromotive force of the first thermocouple (16) apparently drops to a predetermined value, an electromagnetic type An incomplete combustion prevention control unit (20) that switches the fuel valve (8) to the closed state is built into the controller (14), so that if incomplete combustion due to oxygen deficiency or incomplete combustion due to exhaust passage clogging occurs, combustion The operation is automatically stopped.

When the water pressure responsive valve (9) closes and the burner (2) extinguishes due to a decrease in the water supply pressure, the electromagnetic fuel valve (8) switches to the closed state due to the decrease in the electromotive force of the first thermocouple (16). However, as described above, the electromagnetic fuel valve (8) is switched to the closed state by turning off the micro switch (12) accompanying the closing of the hydraulically actuated valve (9) (specifically, immediately before closing). Therefore, when the water pressure responsive valve (9) is closed, the micro switch (12) is turned off before the switching due to the reduction of the electromotive force of the first thermocouple (16).
As a result, the electromagnetic fuel valve (8) is switched to the closed state with good responsiveness.

In other words, after the hydraulic pressure responsive valve (9) closes due to the decrease in water supply pressure and the burner (2) extinguishes, the electromotive force of the first thermocouple (16) closes the electromagnetic fuel valve (8) until the temperature drops due to heat dissipation. It takes some time to reduce the valve to the specified value, but during that time, the water supply pressure rises and the hydraulic pressure responsive valve (9) returns to open, causing the fuel gas raw release to occur. This is prevented by switching the electromagnetic fuel valve (8) to the closed state by turning off the micro switch (12).

The above-described pre-emptive gas instantaneous water heater of the present embodiment has various functions such as raw fuel gas release prevention, automatic re-ignition, and incomplete combustion prevention, but does not have a pilot burner. In this respect, the fuel consumption is small and the operating cost is low as compared with the model equipped with the pilot burner.

[Another embodiment]

 Next, another embodiment will be listed.

(a) In the above-described embodiment, in the movable part that is displaced by the water supply pressure in the water supply state to the water heating heat exchanger (1),
Applying the Guyafram (6a) in the water governor (6),
The specific structure of the movable member, and the specific structure of the mechanism for mechanically interlocking the movable member and the hydraulic pressure responsive valve (9),
Various configuration changes are possible.

(b) In the present invention, the specific structure for switching the fuel valve (8) to the closed state with the closing of the hydraulically actuated valve (9) by the linkage with the movable member can be modified in various ways, and Various structures can be applied to the structure for starting and operating the igniter (13) with respect to the burner (2) when the hydraulically responsive valve (9) is opened in cooperation with the movable member.

(c) The present invention can be applied to a type in which a hot water tap is provided instead of the hot water tap (3) in the above-described embodiment.

[Brief description of drawings]

1 and 2 show an embodiment, FIG. 1 is an apparatus configuration diagram, and FIG. 2 is a graph for explaining an operation mode. FIG. 3 is a device configuration diagram showing a conventional example. (1) …… heat exchanger, (2) …… burner, (6a) …… movable member, (7) …… fuel passage, (8) …… fuel valve, (9) …… hydraulic responsive valve, (12) …… valve opening / closing detection means, (13) …… ignition means, (1
4) …… Control means, (16) …… Combustion detection means.

Claims (2)

[Claims] 1. A movable member (6a), which is displaced by the water supply pressure when the water heating heat exchanger (1) is being supplied, is provided, and the water supply pressure is appropriate by mechanical interlocking with the movable member (6a). A water heater in which a hydraulically operated valve (9) that opens only at certain times is placed in series with an electromagnetic fuel valve (8) in the fuel path (7) to the main burner (2). There is a valve opening / closing detection means (1 that detects opening / closing of the water pressure responsive valve (9).
2) and combustion detection means (1) for detecting combustion of the main burner (2)
6) and, based on the detection information of the valve opening / closing detection means (12) and the detection information of the combustion detection means (16), the fuel valve (8) is turned on along with the opening operation of the water pressure responsive valve (9). The fuel valve (8) is opened and the ignition means (13) of the main burner (2) is ignited, and the hydraulic pressure responsive valve (9) is closed and the combustion detection means (16) detects non-combustion. Hot water supply apparatus provided with a control means (14) for closing. 2. The valve opening / closing detecting means (12) is the movable member.
By detecting the displacement of (6a), the supply water to the lower supply pressure value pressure responsive valve (9) is closed (P ₂₎ setting than the width ([Delta] P ₂₎ is higher by water supply pressure value (Pb) When the water pressure response valve (9) is closed, it is detected that the water pressure responsive valve (9) is closed, and the water pressure responsive valve (9) is opened by a set width (ΔP ₁ ) more than the valve opening water pressure value (P ₁ ). The hot water supply apparatus according to claim 1, wherein when the water supply pressure rises to a high water supply pressure value (Pa), it is detected that the water pressure responsive valve (9) is opened.