JPH02178562A - Hot water feeder - Google Patents

Abstract

PURPOSE:To prevent a discharging of raw fuel to be caused by a returning of a hydraulic pressure responsive valve to its opened state by a method wherein a fuel valve is changed over to its closed state as the hydraulic pressure responsive valve is closed under a cooperation of a movable member. CONSTITUTION:A hydraulic pressure responsive valve 9 has a relation of cooperation with a diaphragm 6a so as to cause the valve to be closed if a water feeding pressure is lowered to a lower limit water feeding pressure value P2. When a micro-switch 12 is turned OFF as the hydraulic pressure responsive valve 9 is closed, a controller 14 is provided for changing over a solenoid fuel valve 8 to its closed state. As the water feeding pressure is lowered to a value less than the lower limit water feeding pressure value P2 during a combusting operation and shows an improper value, the hydraulic pressure responsive valve 9 is closed and the burner 2 is ignited. After this operation, even if the water feeding pressure is increased again up to a valve opening water feeding pressure P1 and the hydraulic pressure responsive valve 9 is returned to its opened state, a fuel passage 7 for the burner 2 is kept closed by the electromagnetic fuel valve 8 kept at its closed state until the water feeding pressure reaches an ON operating water feeding pressure value Pa, resulting in that it is possible to prevent a discharging of raw fuel gas caused by the returning of the hydraulic pressure responsive valve 9 to its opened state.

Description

Detailed Description of the Invention [Industrial Application Field] The first invention and the second invention provide a movable member that is displaced by the water supply pressure when water is being supplied to the water heating heat exchanger, The present invention relates to a water heater in which a water pressure responsive valve, which opens only when the water supply pressure is appropriate due to mechanical interlocking with a movable member, is arranged in series with a fuel valve and interposed in a fuel path to a main burner.

[Conventional technology]

Conventionally, hydraulic response valves have been used that open only when the water supply pressure is appropriate due to mechanical movement with a movable member that is displaced by the water supply pressure (for example, a diaphragm in a diaphragm water governor installed in the water supply channel). As a water heater of the above type that prevents the so-called dry firing state, the third type of water heater is
There is an addition shown in the figure.

In the water heater shown in Fig. 3, (21) is an operating tool for starting and stopping hot water supply;
2) is a hot water tap, and (9) is a diaphragm (6a) in a water governor (6) installed in the water supply channel (5) (i.e.
A hydraulic response valve that opens only when the water supply pressure is appropriate due to mechanical interlocking via an interlocking rod (10) with a movable member that is displaced by water supply pressure when water is supplied to the heat exchanger (1). , (12') is linked with the operation tool (21) to turn ON when the hot water supply starts and turns OFF when the hot water supply is stopped.
The microswitch (14') switches the fuel valve (8) to an open state and operates the igniter (13) for a predetermined period of time when the microswitch (12') is turned on. This is a controller that switches the fuel valve (8) to a closed state when the fuel valve (12°) is turned off.

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

[Problem to be solved by the invention]

However, with the above-mentioned conventional device, the water supply pressure drops for some reason during combustion operation (during hot water supply operation) and becomes inappropriate, which causes the water pressure response valve (9) to close and the main burner (2) to extinguish. After the main burner (2) is re-ignited by the transfer of flame from the pilot burner (23), when the water supply pressure rises again to the proper state and the water pressure response valve (9) returns to open. This prevents raw fuel release (fuel release without combustion) due to the return of the hydraulically responsive valve (9) to the open state when the main burner is extinguished. It is essential to equip a pilot burner (23) that can continue combustion regardless of the situation (specifically, a pilot burner that supplies fuel from the upstream side of the hydraulically responsive valve (9) in the fuel path (7)). there were.

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

The object of the present invention 1 and the second invention is to prevent the raw release of fuel due to the return of the hydraulically responsive valve to open without using a pilot burner, and to prevent the pilot burner from this type of water heater using the hydraulically responsive valve. The advantage is that it allows the burner to be omitted.

[Means for Solving the Problems 1] A characteristic configuration of the water heater according to the first invention is that a movable member is provided which is displaced by the water supply pressure when water is supplied to the water heating heat exchanger, and a mechanical connection with the movable member is provided. A water pressure responsive valve that opens only when the water supply pressure is appropriate.
In a configuration in which the fuel valve is arranged in series and interposed in the fuel path to the main burner, the linked closing valve switches the fuel valve to a closed state when the hydraulically responsive valve closes by linking with the movable member. Provision of operating means (corresponding to claim 1)
Its function is as follows.

[For production]

In other words, when the water pressure responsive valve is closed due to a drop in water supply pressure that has become inappropriate, the fuel valve is switched to the closed state by the linked valve closing operating means in conjunction with the movable member. Even if the water supply pressure rises again to the proper state when the burner is extinguished and the water pressure response valve returns to open, the fuel path to the main burner is shut off by the fuel valve that has been switched to the closed state by the linked valve closing operation means. This makes it possible to prevent the main discharge of fuel due to the return of the hydraulically responsive valve to its open state.

[Second Means for Solving the Problem] The characteristic configuration of the water heater according to the second invention is that a movable member is provided which is displaced by the water supply pressure when water is supplied to the water heating heat exchanger, and a mechanical connection with the movable member is provided. A water pressure responsive valve that opens only when the water supply pressure is appropriate.
In a configuration in which the fuel valve is arranged in series and interposed in the fuel path to the main burner, an igniter for the main burner is activated in conjunction with the movable member when the hydraulically responsive valve is opened. The invention consists in providing an ignition operation means (corresponding to claim 3),
Its action is as follows.

[For production]

In other words, after the water pressure response valve closes and the main burner is extinguished due to the water supply pressure decreasing and becoming inappropriate, the water supply pressure rises again to the proper state while the main burner is extinguished, and the water pressure response valve is activated. Even if the valve returns to open, the igniter for the main burner is activated by the linked ignition operating means in conjunction with the movable member as the hydraulic response valve returns to open, and the main burner is re-ignited. Re-ignition can prevent the main release of fuel due to the return of the hydraulically responsive valve to open.

〔Effect of the invention〕

In summary, according to the first invention or the second invention, in any case, the main discharge of fuel due to the return of the hydraulic response valve to open can be prevented without using a pilot burner, and safety can be ensured. It has become possible to omit the pilot burner from this type of water heater that uses a hydraulically responsive valve, and in turn, by omitting the pilot burner, it has become possible to save fuel consumption and reduce operating costs compared to conventional systems. Ta.

Further, according to the first aspect of the present invention, the fuel valve is switched to the closed state as the water pressure response valve is closed due to the water supply pressure decreasing and becoming inappropriate. As long as the condition is correct, even if it lasts for a long time, the fuel path to the main burner is the same as when the water heater is not in use.
The system is maintained in a double shut-off state by the fuel valve and the hydraulically responsive valve, and in addition to the above-mentioned basic effects, there is an advantage in that the fuel can be shut off more reliably and is safer.

On the other hand, with the second invention, the igniter for the main burner is activated and the main burner is re-ignited when the hydraulically responsive valve returns to open, so hot water is automatically supplied when the hydraulically responsive valve returns to open. In addition to the above-mentioned basic effect, this has the advantage of being excellent in convenience.

〔Example〕

Next, an example will be described.

Figure 1 shows the configuration of a stop-start gas instantaneous water heater, which is an example of a water heater. It is a heating burner (main burner), and (3) is a heat exchanger (
This is a hot water tap connected to the hot water supply path (4) from 1).

A diaphragm water governor (6) is installed in the water supply channel (5) to the heat exchanger (1), and an electromagnetic fuel valve (8) is installed in the fuel channel (7) to the burner (2). ) and hydraulic valve (9
) are arranged in series and interposed.

The water pressure response valve (9) mechanically interlocks with the diaphragm (6a) (movable member) in the water governor (6) via the interlocking rod (lO) to control the state of water supply (hot water supply) to the heat exchanger (1). This is a valve that opens only when the water supply pressure is appropriate when the tap (3) is opened and water is flowing. Specifically, as shown in Figure 2, the valve opens when the water supply pressure reaches a predetermined opening state. The valve opens when the water supply pressure rises to the value (Pl), and after opening,
The interlocking relationship with the diaphragm (6a) is set so that the valve closes when the water supply pressure decreases to the lower limit water supply pressure value (P,).

The ignition and extinguishing operation mechanism uses a switch operation piece (11) attached to the interlocking rod (10) to control the displacement of the interlocking rod (10).
In other words, due to the displacement of the diaphragm (6a), ON/
A microswitch (12) is provided that turns ON when the water pressure responsive valve (9) opens and turns OFF when the water pressure responsive valve (9) closes.
When the microswitch (12) is turned on, the electromagnetic fuel valve (8) is switched to the open state, and the burner (
When the igniter (13) for 2) (i.e., the igniter that directly ignites the main burner (2)) is activated for a predetermined period of time, and the microswitch (12) is turned off. A controller (14) is provided for switching the electromagnetic fuel valve (8) to a closed state.

That is, with this configuration, hot water supply is started when the hot water tap (3) is opened, and hot water supply is stopped when the hot water tap (3) is closed.

To explain the ON/OFF operation of the microswitch (12) in more detail, as shown in Fig. 2, when the microswitch (12) is turned ON due to the opening of the hydraulically responsive valve (9), the microswitch (12) is turned ON when the hydraulically responsive valve (9) opens. When the water supply pressure rises to the ON operation water supply pressure value (Pa) which is higher than the water supply pressure value (Pl) by the setting width (8P), the micro switch (12) turns ONL, and the subsequent water pressure responsive valve (9) ), the water supply pressure decreases to the OFF operation water supply pressure value (Pb) that is higher by the setting width (ΔP2) than the lower limit water supply pressure value (P2) at which the water pressure responsive valve (9) closes. When this happens, the microswitch (12) turns O.
The relationship between the microswitch (12) and the diaphragm (6a) is set so that the FF is established.

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

(b) During the combustion operation (during hot water supply operation), the water supply pressure drops to below the lower limit water supply pressure value (P2) for some reason and becomes inappropriate, so the water pressure response valve (9) closes and the burner After (2) is extinguished, even if the water supply pressure returns to the open valve water supply pressure value (Pl) and the water pressure response valve (9) returns to open, the water supply pressure will rise further and return to ON. Until the operating water supply pressure value (Pa) is reached, the water pressure response valve (9)
The fuel passage (7) from the electromagnetic fuel valve (8) to the burner (2), which is switched to the closed state when the microswitch (12) is turned OFF when the valve is closed, is kept in a cutoff state. This prevents the raw release of fuel gas due to the return of the valve (9) to the open state.

(b) When the water supply pressure rises further from the state in (a) above and reaches the ON operation water supply pressure value (Pa), the microswitch (12) is turned on to turn on the electromagnetic fuel valve (8).
) is switched to the open state, the igniter (13) is activated and the burner (2) is re-ignited, and as a result, after the hydraulic response valve (9) returns to the open state, combustion operation for hot water supply starts. will be restarted automatically.

(c) The ON operation water supply pressure value (f') that turns on the microswitch (12) is based on the fact that the function of (a) above prevents the raw release of fuel gas due to the return of the hydraulic response valve (9) to the open state. By setting a) higher than the valve-opening water supply pressure value (Pl) at which the hydraulically responsive valve (9) opens by the setting width (ΔP1), the hydraulically responsive valve (9) is always activated when the igniter (13) is started. ) is already in a fully open state, thereby preventing meaningless ignition operation from the stage where the hydraulically responsive valve (9) is not yet open, and preventing the hydraulically responsive valve (9) from opening.
This is particularly important for the water heater of this example, which uses the battery (15) as a power source, by avoiding ignition operation that is likely to lead to ignition errors when the valve 9) is not yet fully opened. ) and to improve the ignition function in terms of reliability and stability.

(d) As a step before the prevention of raw fuel gas release by the function described in (a) above, the water pressure response valve (9)
After the valve closes, the water pressure responsive valve (9
) until the valve returns to open, such an inappropriate state of water supply pressure may continue for a long time. immediately before) by turning off the micro switch (12), the electromagnetic fuel valve (8)
) When the valve is switched to the closed state, the fuel path (7) is maintained in a double cutoff state by the electromagnetic fuel valve (8) and the hydraulic valve (9), thereby ensuring fuel cutoff. We aim to improve safety as a decoy.

(E) When the water pressure response valve (9) is closed, the microswitch (12) is turned off to switch the electromagnetic fuel valve (8) to the closed state, and the microswitch (12) is turned off.
The OFF operation water supply pressure value (Pb) to be
) is set higher than the lower limit water supply pressure value (P2) when the valve closes [1] (
By setting ΔP2) higher, when the water pressure response valve (9) closes due to a drop in water supply pressure, the microswitch (12) is already turned off and the electromagnetic fuel valve (8) closes.
) is switched to the closed state in advance, and if the relationship between the closing timing of the hydraulically responsive valve (9) and the FF timing of the micro switch (12) is delicate and uncertain ( For example, water pressure responsive valve (9)
Lower limit water supply pressure value and micro switch (12) to close the valve
(e.g., when the OFF operation water supply pressure value that turns OFF is set to the same value by design), the water pressure response valve (9) closes due to a drop in the water supply pressure, and the burner ( 2) was extinguished, but the drop in water supply pressure was just to the lower limit positive water supply value, and the microswitch (12) did not turn off due to the timing difference.
Thereafter, the water supply pressure rises again and the water pressure responsive valve (9) returns to open, thereby reliably preventing raw fuel gas release.

On the other hand, in the figure (16) is the first thermocouple that is heated by the combustion flame of the burner (2), and (17) is the second thermocouple that is heated as the combustion chamber (18) increases in temperature and pressure. When incomplete combustion occurs due to oxygen deficiency, the first thermocouple (
When the electromotive force of the combustion chamber (16) decreases and incomplete combustion occurs due to the exhaust passage clogging, the combustion chamber (18) decreases due to the exhaust passage clogging.
) increases in temperature and pressure, causing the second thermocouple (17) to generate electricity.

The first and second thermocouples (16) and (17) are interposed in series in the incomplete combustion detection circuit (19) with their positive electrode sides or negative electrode sides connected to each other, In the combustion operation state, an incomplete combustion detection circuit (1
In other words, when the circuit voltage in step 9) decreases to the set lower limit value, in other words, the electromotive force of the first thermocouple (16) itself reaches the predetermined value without electromotive force of the second thermocouple (17). When the electromotive force of the first thermocouple (16) is canceled due to the electromotive force of the second thermocouple (17), the electromotive force of the first thermocouple (16) apparently reaches a predetermined value. An incomplete combustion prevention control unit (20) that switches the electromagnetic fuel valve (8) to the closed state when the temperature drops to The combustion operation is automatically stopped when incomplete combustion occurs.

Due to the drop in water supply pressure, the water pressure response valve (9) closes and the burner (
2) is extinguished, the electromagnetic fuel valve (8) is switched to the closed state due to the decrease in the electromotive force of the first thermocouple (16), but as mentioned above, the electromagnetic fuel valve (8) is switched to the closed state due to the closure of the hydraulically responsive valve (9). (
Specifically, the OF of the micro switch (12) (just before the valve closes)
Since the electromagnetic fuel valve (8) is switched to the closed state by F, when the hydraulic response valve (9) is closed, the first
The Ti electromagnetic fuel valve 8) is quickly and responsively switched to the closed state by turning off the microswitch (12) before switching due to a decrease in the electromotive force of the thermocouple (16).

In other words, after the water pressure responsive valve (9) closes due to a drop in water supply pressure and the burner (2) extinguishes the fire, the electromotive force of the first thermocouple (16) activates the electromagnetic fuel valve (8) due to the temperature drop due to heat radiation. It takes some time for the pressure to drop to the predetermined value that causes the valve to close, but during that time the water supply pressure rises again and the water pressure response valve (9) returns to open, causing raw fuel gas release as described above. This is prevented by switching the electromagnetic fuel valve (8) to the closed state by turning off a microswitch (12) such as the one shown in FIG.

The first-stop gas instantaneous water heater of this example described above has various functions such as prevention of raw fuel gas release, automatic re-ignition, and prevention of incomplete combustion, but is not equipped with a pilot burner. In this respect, the fuel consumption is lower and the operating cost is lower than the type equipped with a pilot burner.

[Another example]

Next, another example will be listed.

(a) In the above embodiment, the water heating heat exchanger (1)
The diaphragm (6a) in the water governor (6) is applied to the movable member that is displaced by the water supply pressure when water is supplied to the water governor (6). The specific structure of the mechanism for mechanically interlocking can be modified in various ways.

(b) In the above embodiment, the movable member (water governor (6)
) in conjunction with the diaphragm (6a)) to switch the fuel valve (8) to the closed state when the hydraulically responsive valve (9) closes, thereby causing the hydraulically responsive valve (9) to return to the open state and release the fuel inside. Although the release was prevented (corresponding to the first invention),
Instead, a movable member (e.g. the diaphragm (6a) of the water governor (6)
)) A linked ignition operation means is provided to start the igniter (13) for the burner (2) (main burner) when the hydraulically responsive valve (9) opens, and when the burner is re-ignited, the hydraulically responsive valve ( It is also possible to prevent release into the fuel due to the return of the valve in 9) (corresponding to the second invention).

(c) In the first invention, the specific structure of the linked valve closing operation means that switches the fuel valve (8) to the closed state when the hydraulically responsive valve (9) is closed by linking with the movable member may have various configurations. In addition, in the second invention, when the water pressure responsive valve (9) opens, the burner (2)
) Various structures can be applied to construct the linked ignition operating means for starting the igniter (13) for the ignition device (13).

(d) The first and second inventions can also be applied to a type in which a water tap is provided in place of the hot water tap (3) in the above-described embodiment.

[Brief explanation of the drawing]

1 and 2 show examples, FIG. 1 is a diagram of the configuration of the device, and FIG. 2 is a graph explaining the operating mode. FIG. 3 is a diagram showing the configuration of a conventional device. (1) Heat exchanger, (2) River burner,
(6a)...Movable member, (7)...Fuel path, (8)...Fuel valve, (9)...
Water pressure response valve, (13) Scream...igniter, (16)...
··thermocouple.

Claims (1)

[Claims] 1. A movable member (6a) is provided which is displaced by the water supply pressure when water is supplied to the water heating heat exchanger (1), and the water supply pressure is adjusted by mechanical interlocking with the movable member (6a). A water heater in which a water pressure responsive valve (9) that opens only when the fuel valve (9) is in an appropriate state is arranged in series with a fuel valve (8) and interposed in a fuel path (7) leading to a main burner (2). The hot water supply apparatus is provided with a linked valve closing operating means that switches the fuel valve (8) to a closed state in conjunction with the movable member (6a) when the hydraulically responsive valve (9) closes. 2. Set the linked valve closing operation means to a setting width (ΔP_
2) When the water supply pressure decreases to a higher water supply pressure value (Pb), the fuel valve (8) is switched to the closed state by cooperation with the movable member (6a). Device. 3. Provide a movable member (6a) that is displaced by the water supply pressure when water is supplied to the water heating heat exchanger (1), and only when the water supply pressure is appropriate due to mechanical interlocking with the movable member (6a). A water heater in which a hydraulically responsive valve (9) that opens is arranged in series with a fuel valve (8) in a fuel path (7) leading to a main burner (2), wherein the movable member (6a) A water heater provided with a linked ignition operating means for starting an igniter (13) for the main burner (2) when the water pressure responsive valve (9) is opened. 4. A thermocouple (16) heated by the combustion flame of the main burner (2) is provided, and when the electromotive force of the thermocouple (16) decreases to a predetermined value, the fuel valve (8) is closed. Claims 1 and 2, further comprising incomplete combustion prevention means for switching to
or 3. The water heater according to any one of 3.