JP2780779B2 - Instant water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water faucet for intermittently supplying water to a water tube type water heating heat exchanger, a fuel valve for intermittently supplying fuel to a burner,
The present invention also relates to an instantaneous water heater provided with an ignition device for the burner.

[Conventional technology]

In the instantaneous water heater as described above, it is possible to switch between the hot water supply state and the hot water supply stop state by operating one hot water supply operation tool,
That is, the faucet and the fuel valve are opened and the ignition device is operated in conjunction with the ON operation of the hot water supply operation tool, and the faucet and the fuel valve are closed in connection with the OFF operation of the hot water supply operation tool. It is desired from the operation side, and in the hot water supply state, switching from the hot water supply state to the water discharge state and switching from the water discharge state to the hot water supply state, that is, closing the fuel valve with the water tap open, switching to the water discharge state and It is desired that the fuel valve can be opened while the faucet is opened, and the ignition device can be operated to switch to the hot water supply state by a simple operation.

As a conventional example of such an instantaneous water heater, Japanese Utility Model Laid-Open No. 63-19410
In the device described in Japanese Patent Application Publication No. H06-209, a self-holding solenoid operated by a start / stop switch as a hot water supply operating device is used to open and close a water supply valve as a water faucet. Combustion stop, which is turned on when the running water switch that detects the supply of water due to the opening of the valve and turns on and the hot water temperature adjustment knob that is also used as the hot water changeover operation tool is located at the "water only position" And a micro switch for, when the flowing water switch is in an ON state and the micro switch is in an OFF state, opens an electromagnetic on-off valve as a fuel valve and operates an igniter as an ignition device,
If the micro switch is ON even when the flowing water switch is ON, the electromagnetic on / off valve is closed to stop combustion.

[Problems to be solved by the invention]

However, the above-described conventional device requires a start / stop switch, a running water switch, and a microswitch, and there is a disadvantage that maintenance work is increased due to inspection and maintenance work of these switches.

In other words, the switches, which are electric circuit components, have a certain life, and since the above-mentioned switches are frequently opened and closed, inspection and maintenance work is required for use. Inspection and maintenance work must be performed on the switches described above, which causes an inconvenience of increasing maintenance work.

The present invention has been made in view of the above circumstances,
The purpose is to switch between a hot water supply state and a hot water supply stop state by operating a single hot water supply operating tool while suppressing an increase in labor for maintenance. It is in the point that the switching from the water discharge state to the hot water supply state can be easily performed.

[Means for solving the problem]

The characteristic configuration of the instantaneous water heater according to the present invention is a configuration in which a water faucet for intermittently supplying water to a water tube type water heating heat exchanger, a fuel valve for intermittently supplying fuel to a burner, and an ignition device for the burner are provided. In the above, a push button type hot water supply operating tool and a hot water switching operation tool are provided, and the water tap is opened in conjunction with a pushing operation of the hot water supply operating tool to an ON state, and the hot water supply operating tool is turned off. Provide a mechanical faucet side linkage mechanism that closes the faucet in conjunction with the operation, when the ignition command is commanded, opens the fuel valve and ignites the ignition device, and performs the ignition command. A control means for closing the fuel valve when there is no command is provided. One switch that can be freely switched between a command state in which the ignition command is commanded and a non-command state in which no command is issued, and is biased to the command state side. Along with When the hot water supply device is in the OFF state, the switch is mechanically held in the non-command state, and when the hot water supply device is in the ON state, the mechanical holding of the switch to the non-command state side is released. A first interlocking device, and a switch for mechanically holding the switch in a non-command state when the hot water switching operation tool is in the water side switching state, and the switch when the hot water switching operation tool is in the hot water switching state. A second interlocking device for releasing the mechanical holding to the non-command state side with respect to is provided, and the ignition is performed only when the hot water supply operation tool is in the ON state and the hot water switching operation tool is in the hot water side switching state. Command state, the hot water supply operation tool is in an ON state, and
When the hot / water switching operation tool is in the water side switching state, the hot water supply operation tool is in the OFF state, and when the hot / water switching operation tool is in the water side switching state, and when the hot water supply operation tool is
In the F state, and when the hot and cold water switching operation tool is in the hot water side switching state, it is configured to be in a non-command state in which the ignition command is not commanded, and its operation and effect are as follows. It is on the street.

(Operation)

In other words, the faucet can be opened and closed mechanically with a push-button type hot water supply operating tool using the mechanical faucet side linkage mechanism. By operating one switch that can be freely switched to the command state and is urged toward the command state with a first interlocking tool that is linked to the hot water supply operation tool and a second interlocking tool that is linked to the hot water switching operation tool. , The hot water supply operation is ON, and
Only when the hot and cold water switching operation tool is in the hot water side switching state is the command state of the ignition command, the hot water supply operation tool is in the ON state, and
When the hot and cold water switching operation tool is in the water side switching state, the hot water supply operation tool is in the OFF state, and when the hot and cold water switching operation tool is in the water side switching state, and the hot water supply operation tool is in the OFF state, and When the hot and cold water switching operation tool is in the hot water side switching state, it can be set to the non-command state in which the ignition command is not commanded.

In addition, when the hot water supply switching operation tool is in the hot water side switching state when the push button type hot water supply operation tool is pushed to the ON state and the faucet is opened, the first interlocking tool and the second interlocking operation are performed. Both of the components have released the mechanical holding of one switch to the non-command state side, the switches are in the command state, the ignition command is issued, the fuel valve is opened, the ignition device is ignited, and the hot water supply state is released. Becomes

Then, in the hot water supply state, when the hot and cold water switching operation tool is switched to the water side switching state, the second interlocking device mechanically holds the switch to the non-command state side, and there is no ignition command, and the fuel valve Is closed to switch from the hot water supply state to the water discharge state.

In addition, when the hot water switching operation tool is switched to the hot water side switching state in the water discharge state, the second interlocking device releases the mechanical holding of the switch to the non-command state side, and the ignition command command state and Then, the fuel valve is opened and the ignition device is ignited to switch from the water discharge state to the hot water supply state.

Further, when the hot water supply operation tool is turned off, the faucet closes and the first interlock device mechanically holds the switch to the non-command state side, so that the ignition command is lost and the fuel valve is opened. The valve is closed and the hot water supply is stopped.

〔The invention's effect〕

Therefore, it is possible to switch between the hot water supply state and the hot water supply stop state by operating one hot water supply operating tool, and in the hot water supply state, by operating the hot water switching operation tool, switching from the hot water supply state to the water discharge state and from the water discharge state to the hot water supply state. The switch can be easily switched between a command state in which an ignition command is commanded and a non-command state in which no command is issued, and only one switch biased toward the command state is provided. Therefore, as compared with the conventional instantaneous water heater in which inspection and maintenance work must be performed for a large number of switches, an increase in maintenance time is suppressed, and therefore, operability is excellent, and An instantaneous water heater with excellent maintenance was also obtained.

〔Example〕

 Next, an embodiment will be described.

FIG. 1 shows the entire configuration of a gas instantaneous water heater. A fin tube type water heating heat exchanger (3) and a plate-like burner (3) are provided in a casing (2) having an exhaust port (1) at the upper end. A burner unit (4) in which 4a) are juxtaposed and a controller (5) are installed, and a casing (2) is provided with a combustion air intake (6).

(7) includes a heat exchanger (3) and a combustion chamber (8) between the heat exchanger (3) and the burner unit (4).
Is a cylindrical body that forms

The water supply path (9) to the heat exchanger (3) includes a faucet (10) that interrupts the water supply, a water governor (11) that maintains the water supply pressure at an appropriate pressure,
And a diversion valve (12) for hot water temperature adjustment is interposed,
A tapping path (13) from the heat exchanger (3) is connected to a tapping tool (15) via a flexible pipe (14).

Also, the fuel gas supply path (16) to the burner unit (4)
The gas valve (17) for intermittent fuel supply and the interlocking rod (18)
a) A water pressure responsive valve (18) that opens only in the proper water supply state in conjunction with the water governor (11) via a), a gas governor (19) that maintains the supply gas pressure at an appropriate pressure, and adjustment to adjust the supply gas amount The valve (20) is interposed.

(21) is a pilot burner connected to the fuel gas supply passage (16) between the gas valve (17) and the hydraulic valve (18), (2)
2) is a first thermocouple generated by being heated by the combustion flame of the pilot burner (21), (23) is a spark plug,
(24) is a second thermocouple for detecting exhaust air path blockage, and
(25) is a dry battery as a built-in power supply.

The diverting valve (12) regulates the amount of water supplied to the heat exchanger (3) and the amount of bypass water diverted from the water supply channel (9) to the hot water channel (13) via the bypass channel (26). The temperature of the hot water is adjusted by adjusting the amount of water by the flow dividing valve (12) and the amount of supplied gas by the adjusting valve (20).

The water governor (11) is a diaphragm (11c) formed by a pressure difference between a downstream water pressure introduced into the secondary pressure chamber (11a) through the communication passage (27) and an upstream water pressure in the primary pressure chamber (11b). The water supply pressure is adjusted by interlockingly displacing the governor valve body (11b) with respect to the displacement of.

A so-called pilot-type diaphragm-type faucet is used for the faucet (10), (28) is a diaphragm valve for opening and closing the water supply passage (9), and (29) is a pilot valve formed on the diaphragm valve (28). Pilot valve body that opens and closes the hole (30),
(31) is a spring that biases the pilot valve element (29) to the closing side, (32) is an operating rod that closes and opens the pilot valve element (29) against the biasing force, and (33) is a diaphragm chamber ( 34) and a fine hole communicating the upstream water supply channel (9).

In other words, when the pilot hole (30) is closed by the urged pilot valve element (29), the diaphragm is moved by the upstream water pressure introduced into the diaphragm chamber (34) through the small hole (33). When the pilot valve (29) is opened by opening the pilot valve (29) by pulling the operating rod (32) while the valve (28) is held in the closed state and the diaphragm is closed, The water pressure in the chamber (34) is released, and the diaphragm valve element (28) is opened by the water pressure applied to the water channel side pressure receiving surface.
The large-diameter water supply passage (9) can be opened and closed only by operating the small-diameter pilot valve element (29), and has the advantage that the required operation force and the required operation amount are extremely small.

The gas valve (17) employs a closing bias type solenoid valve. (17a) is a valve body constantly biased to the closing side by a spring (17b), and (17c) resists the closing biasing force. Te valve (17
a) An electromagnetic coil that opens and operates.

The hot water supply start and stop operations are performed by a push button type hot water supply operation tool (35) arranged on the entire surface of the casing (2). The hot water supply operation tool (35) is as shown in FIGS. 2 to 5. The projecting position (a) is formed by a linking action of a holding mechanism (37) provided on a rod (36) connected to the spring and a spring (38) for urging the hot water supply operation tool (35) to the projecting side.
Is automatically held at a predetermined pushing position (b) in response to a pushing operation from the user, and when pushed again while being held at the pushing position (b), the holding is released and the initial projecting position It automatically returns to (a).

As for the operation of the faucet (10), as a faucet-side linkage mechanism for faucet operation, the rod part (36) is operated in accordance with the pushing operation of the hot water supply operating tool (35) from the protruding position (a). A first swing member (40) that swings around the first shaft center (P ₁ ) against the urging force of the return spring (39) by contact with the tip is provided, and the first swing member ( At the tip of 40), a fork (40a) for pulling the operating rod (32) of the pilot diaphragm type faucet (10) by locking is provided.

That is, the water tap (10) is opened by pulling the operating rod (32) by the swing of the first swing member (40) accompanying the pushing operation of the hot water supply operating tool (35) from the protruding position (a). And holding the water tap (10) in the valve open state by holding the operating rod (32) in the pulling operation state by holding the hot water supply operating tool (35) at the pushing position (b). When (35) is returned to the protruding position (a) by the pushing operation again, the operation rod (32) is pulled by the return swing of the first swing member (40) by the urging force of the return spring (39). The operation is canceled and the faucet (10) is opened.

On the other hand, regarding the operation of the gas valve (17), the operation piece (41
A micro switch (41) which is turned off by pushing the button a) against the urging force is provided, and the operating piece (41a) is applied to the first swing member (40) by the urging force of the return spring (39). ) Is connected to a switch operation section (40b) that turns off the micro switch (41) by pressing the micro switch (41), and the controller (5) opens and closes the gas valve (17) based on ON / OFF of the micro switch (41). Is executed.

That is, when the hot water supply operation tool (35) is pushed from the protruding position (a), the first swing member (40) swings accordingly to release the pushing of the switch operation section (40b) against the operation valve (41a). Then, the micro switch (41) is turned ON, that is, a command state for instructing the ignition command, and based on this ON, the controller (5) executes the opening operation of the gas valve (17),
Also, when the hot water supply operation tool (35) is returned to the protruding position (a) by the pushing operation again, the switch is moved along with the return swing of the first swing member (40) by the urging force of the return spring (39). The operation piece (41a) is pressed by the operation section (40b) to turn off the micro switch (41), that is, the non-command state in which the ignition command is not commanded. Based on this OFF, the closing operation of the gas valve (17) is performed by the controller (5). ).

In the controller (5), based on the ON of the micro switch (41), the (5A) starts the valve opening operation power supply from the dry battery (25) to the gas valve electromagnetic coil (17c) and opens the gas valve (17). At the same time, an operation command is given to the ignition circuit (5B) to supply electric power from the dry battery (25) to the ignition plug (23).
Is activated for the set ignition time (T ₁ ), and based on the turning off of the micro switch (41), the valve opening operation power supply from the dry cell (25) to the gas valve electromagnetic coil (17c) is cut off and the gas valve ( 17) is an operation circuit that closes the valve by the biasing force. In addition to the basic operation function described above, this operation circuit (5A) includes the first thermocouple (2) by the ignition of the pilot burner (21).
When the electromotive force of 2) exceeds the set value within the set ignition time (T ₁₎ is open the operation power supply to continue the gas valve solenoid coil also after a set ignition time (T ₁₎ (17c) Is maintained, the gas valve (17) is kept open, but if the electromotive force of the first thermocouple (22) does not reach the set value within the set ignition time (T ₁ ) due to misfiring, , When the set ignition time (T ₁ ) has elapsed, the valve opening operation to the gas valve electromagnetic coil (17c) is cut off, the gas valve (17) is closed, and the gas valve (17) is closed automatically by the biasing force. During the combustion operation in which power supply to the gas valve electromagnetic coil (17c) is continued during the combustion operation, the pilot burner (21) with respect to the first thermocouple (22) caused by the occurrence of incomplete combustion due to lack of oxygen or the like. When the electromotive force of the first thermocouple (22) drops below the set value due to a decrease in the heating effect At that time, the valve opening operation to the gas valve electromagnetic coil (17c) is cut off, the gas valve (17) is closed, and the gas valve (17) is closed and automatically closed by the biasing force. The function of (1) prevents raw gas leakage at the time of misfiring and continuous operation in an incomplete combustion state.

Therefore, when the ignition command is issued, the controller (5) opens the gas valve (17) serving as the fuel valve and ignites the ignition plug (23) serving as the ignition device, and
Functions as control means for closing the gas valve (17) when there is no ignition command, and the switch operation unit (40b)
When the hot water supply operation tool (35) is in the OFF state, the micro switch (41) is turned off as a non-command state against the urging force.
It is mechanically held in the F state and the hot water supply operation tool (35) is
OFF for micro switch (41) when in N state
It functions as a first interlocking device that releases the mechanical holding on the state side.

In short, in the hot water supply operation, when the push button type hot water supply operation tool (35) is pushed from the protruding position (a),
The water faucet (10) is opened by mechanical movement to start water supply, and the spark plug (23) is sparked based on the ON of the micro switch (41), and the gas valve (17) is opened. Burner unit (4) and Pyro burner (21)
This causes the hot water supply to start unless the gas valve (17) is automatically closed due to misfiring.

After the hot water supply is started, while the hot water supply operation tool (35) is held at the push-in position (b), the water tap (1) is held by the holding.
0) is mechanically kept open, and the gas valve (17) is kept open by maintaining the ON state of the microswitch (41). The hot water supply is continued unless the automatic valve opening is performed.

Thereafter, when the hot water supply operation tool (35) held at the pushing position (b) is returned to the projecting position (a) by the pushing operation again, the faucet (10) is closed by mechanical movement and the water supply is stopped. At the same time, when the micro switch (41) is turned off, the gas valve (17) is closed, the burner unit (4) and the pilot burner (21) are extinguished, and the hot water supply is stopped.

The controller (5) includes a flashback prevention circuit (5C) for preventing flashback when the burner unit (4) is re-ignited, in addition to the operation circuit (5A) and the ignition circuit (5B). In addition, a block operation prevention circuit (5D) for preventing incomplete combustion caused by blockage of the exhaust air path is provided. Specifically, the flashback prevention circuit (5C) is provided with a micro switch (41C). The time limit (T
₂ ) is counted by the timer (TM), and when the micro switch (41) is turned on again during the counting of the set time limit (T ₂ ), the controller (5) receives the ON signal as an ignition command. Is to prevent acceptance into the office.

In other words, immediately after the gas valve (17) is closed based on the turning off of the micro switch (41), afterburning is stopped by the burner unit (4), the residual fire is generated inside the flame hole of each plate-shaped burner (4a). When the gas valve (17) is heard again in such a state of igniting, combustion which should be started at the flame hole outlet by the spark operation of the ignition plug (23) may occur. The so-called flashback phenomenon occurs when the fire starts in the inner part of the flame hole due to the embers.

Therefore, the above-described backfire prevention circuit (5C) is provided, and immediately after the hot water supply operation tool (35) is once returned to the projecting position (a) and the hot water supply is stopped, the hot water supply operation tool (35) is pushed again. Even if the micro switch (41) is turned off during the previous return operation
Setting the time limit time (T ₂₎ in the by preventing acceptance of ON signals, by opening operation of the setting time limit (T ₂₎ within the gas valve (17) is not performed, for remaining fire The time required for complete fire extinguishing is given to prevent the flashback phenomenon described above from occurring.

On the other hand, the blockage operation prevention circuit (5D) supplies the valve opening operation power to the gas valve electromagnetic coil (17c) when the electromotive force of the second exhaust air path blockage detection second thermocouple (24) exceeds a set value. As shown in FIGS. 6 and 7, the second thermocouple (24) has a detection opening (7a) communicating the upper part of the combustion chamber (8) and the outside of the cylinder (7). Barrel (7)
When the exhaust passage is blocked, such as a blockage of the heat exchanger (3), the detection opening () is generated by overheating in the combustion chamber (8) due to the blockage and a rise in chamber pressure. 7a)
The starting force of the second thermocouple (24) is increased by being exposed to the high-temperature combustion gas flowing out of the second thermocouple (24).

That is, based on the detection of the exhaust air passage blockage by the second thermocouple (24) as described above, the power supply to the gas valve electromagnetic coil (17c) is cut off, and the gas valve (17) is closed by its closing urging force. The valve is automatically closed, thereby preventing incomplete combustion caused by blockage of the exhaust air path such as blockage of the heat exchanger and leaving it unattended.

Hot water temperature adjustment by operating the flow dividing valve (12) and the regulating valve (20) is performed by a dial-type temperature adjusting tool (42) arranged on the outer periphery of the push-button hot water supply operating tool (35). A donut-shaped rotating body (43) that rotates integrally with the temperature adjuster (42) is provided, and a gear portion (43a) is formed on a part of the periphery of the rotating body (43). The sector gear (44) connected to the rotary operation shaft (12a) of the valve (12) is
The gear part (43a) of (3) is engaged with the gear part (43a), so that the temperature adjuster (42) and the flow dividing valve (12) are interlocked.

As for the interlocking of the temperature adjusting device (42) and the adjusting valve (20), the adjusting valve (20) is connected to the valve body (20a) and the valve body (20a).
A spring (20b) for urging the valve to the valve opening side and an operating rod (20c) for pushing the valve body (20a) to the valve closing side against the urging force of the spring (20b). And a second swinging member (45) for pushing the operating rod (20c) by swinging around the second axis (P ₂ ), and on the back surface of the rotating body (43), Second swing member (45)
A first cam (43b) for swinging the second swing member (45) to the operating rod pushing operation side with the rotation of the rotating body (43) to one side by contact with one end of the rotating body (43); With the rotation of the temperature adjuster (42) to one side, the adjusting valve (20) is operated to the valve-closing side against the urging force of the spring (20b), and the other of the temperature adjuster (42). The adjustment valve (20) is operated to the valve opening side by the urging force of the spring (20b) with the rotation to the side.

In addition, as for the interlocking relationship, with respect to the rotation operation of the temperature adjustment tool (42) to the side that closes the adjustment valve (20), the diverter valve (12) is interlocked to the side that increases the amount of bypass water. The dial-type temperature adjuster (4
When the valve 2) is rotated to one side, the regulating valve (20) is operated to the valve closing side, and the flow dividing valve (12) is operated to the side of increasing the amount of bypass water so that the tap water temperature decreases. When the adjusting tool (42) is rotated to the other side, the adjusting valve (20) is operated to the valve opening side, and the diverting valve (12) is operated to the side of decreasing the amount of bypass water so that the tap water temperature rises. is there.

In addition to the above hot water temperature adjusting function, at one end of the rotating operation range of the temperature adjusting tool (42), during the hot water supply operation, the burner unit (4) and the pilot burner (21) are extinguished to simply discharge the hot water (15). ) Is provided, and as an operation structure for displaying such a water discharge state, an operation piece of the micro switch (41) is formed by swinging around the third axis (P ₃ ). A third rocking member (46) for pressing the (41a) is provided beside the switch operating portion (40b) of the first rocking member (40), and a temperature adjusting member is provided on the back surface of the rotating body (43). The second cam (43) that swings the third swinging member (46) to the operation piece pushing operation side by contact with one end of the third swinging member (46) when the (42) is rotated to the water discharge position.
c) is provided.

In other words, the hot water supply state in which the push button type hot water supply operation tool (35) is held at the pushing position (b) (that is, the pressing of the operation piece (41a) by the switch operation section (40b) of the first swing member (40)). Is released and the micro switch (41) is turned on), when the dial type temperature adjuster (42) is rotated to the water discharge position, the third cam (43c) is brought into contact with the third cam (43c). Due to the swing of the swing member (46), the operation piece (41a) in the depressed state is pushed and the micro switch (41) is turned off, whereby the gas valve (17) is closed and the burner unit ( 4) and pilot burner (2
When the fire is extinguished in 1), the flood condition is revealed.

In addition to the one-way switching from the hot water supply state to the water discharge state, in the above-described water discharge operation structure, when the temperature adjuster (42) is rotated again from the water discharge position into the water discharge temperature adjustment range, the third rocking operation is performed. When the contact of the second cam (43c) with the moving member (46) is released, the push operation of the third rocking member (46) is released, and the micro switch (41) returns to ON by the self-biasing force. The gas valve (17) is operated by operating the controller (5) in the same manner as at the start of hot water supply based on the ON.
The burner unit (4) and the pilot burner (2)
1) is set to reignite. That is, the temperature adjuster (4
It is possible to return from the water discharge state to the hot water supply state only by the return operation of 2). Therefore, the third swing member (46)
Is a temperature adjuster that also functions as a hot and cold water switching operation tool (42)
When the rotary switch is rotated to the water discharge position and is in the water-side switching state, the micro switch (41) is mechanically held in the OFF state as a non-command state against the urging force, and the temperature adjuster (42) is When the rotary operation is performed within the hot water temperature adjustment range and the hot water side is switched, OF with respect to the microswitch (41) is turned off.
It functions as a second interlock that releases the mechanical holding to the F state side.

Flow dividing valve (12) that is rotated by a temperature adjuster (42)
As shown in FIG. 8, an upstream water supply passage (9a) is connected to a low-and-low cylindrical rotary valve body (12b) connected to a rotary operation shaft (12a).
Flow path hole (12c) for conducting water to the downstream water supply path (9b) to the heat exchanger (3), and second flow path hole for conducting the upstream water supply path (9a) to the bypass path (26). (12d) and the first
The overlapping state of the passage hole (12c) and the inlet of the downstream water supply passage (9b), and the second passage hole (12d) and the bypass passage (26)
The amount of water supplied to the heat exchanger (3) and the amount of bypass water are changed and adjusted by adjusting the state of overlap with the inlet by rotating the rotary valve body (12b).

As a specific water amount change adjustment mode, as shown in FIG. 9, the temperature and the relative arrangement of the first flow passage hole (12c) and the second flow passage hole (12d) are set. As the adjuster (42) is rotated from the high-temperature end to the low-temperature side, the amount of water supplied to the heat exchanger (3) (Q _H ) is maintained at 0 until a certain intermediate temperature by keeping the bypass water amount (Q _B ) at zero. For the rotation operation from the intermediate temperature to the lower temperature side, the amount of water supplied to the heat exchanger (3) (Q _H ) is gradually reduced while the amount of bypass water (Q _B ) Is increased so that the total water amount (Q _H + Q _B ) is gradually increased in a state in which the total water amount (Q _H + Q _B ) is continued to the increase in the heat exchanger water supply amount (Q _H ) up to the intermediate temperature.

In other words, in the fin tube type heat exchanger (3), the pipe line has a meandering shape and is long, so that the pressure loss is more remarkable due to the increase in the water supply amount than the bypass path (26). If the temperature adjustment condition is in the low temperature side end, the pressure loss in such a large pressure loss in the heat exchanger (3) bypass in addition to the ([Delta] P _H) (26) ([Delta] P _B), and the bypass Since the pressure loss (ΔP _M ) at the junction of the channel (26) and the hot water channel (13) also increases, the total pressure loss (ΔP
= ΔP _H + ΔP _B + ΔP _M ) becomes extremely large. Therefore, when the hot water supply start operation is performed in a state where the tapping temperature adjustment state is near the low-temperature side end, the original supply water pressure at that time becomes lower for some reason. In such a case, the water governor (11) may not be able to start hot water supply due to a lack of a sufficient water pressure difference required to open and close the water pressure responsive valve (18).

Therefore, as described above, with respect to the tap water temperature adjustment from a certain intermediate temperature to a lower temperature side, the total water amount (Q _H ) is increased by increasing the bypass water amount (Q _B ) while decreasing the heat exchanger supply water amount (Q _H ).
+ Q _B ) is gradually increased, as shown by the broken line in FIG. 9, so that the conventional hot water supply (Q ′ _H ) simply keeps the heat exchanger water supply amount (Q ′ _H ) after the intermediate temperature. The total pressure loss (ΔP = ΔP _H + ΔP _B + ΔP _M ) when the hot water temperature adjustment state is near the low-temperature side end is compared with the water supply to the heat exchanger (3) where the pressure loss is most remarkable. By reducing the quantity (Q _H ), it is effectively reduced, and as a result, the occurrence of a situation in which the start of hot water supply becomes impossible due to insufficient water pressure difference in the water governor (11) as described above is suppressed. Then, the responsiveness to the fluctuation of the original water supply pressure is improved.

In addition, in FIG. 10, G indicates a change form of the gas supply amount with respect to the rotation operation of the temperature adjuster (42).

(Another embodiment)

 Next, another embodiment will be described.

Various modifications can be made to the specific configuration of the faucet-side linkage mechanism that links the hot-water supply operation tool and the faucet.

The hot and cold water switching operating tool may be used also as a tapping temperature adjusting tool, or may be a dedicated operating tool.

Various configurations can be changed for the specific opening / closing operation configuration of the fuel valve (gas valve) by the control means.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

1 to 10 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram of an instantaneous water heater, FIGS. 2 to 5 are schematic diagrams showing an operation structure, FIGS. FIG. 8 is an enlarged view showing the mounting structure of the second thermocouple, FIG. 8 is an enlarged sectional view of the flow dividing valve, and FIG.
FIG. 10 and FIG. 10 are graphs showing the hot water temperature adjustment mode. (3) ... heat exchanger, (4) ... burner, (5) ... control means, (10) ... faucet, (17) ... fuel valve, (23) ...
... Ignition device, (35) ... Hot water supply tool, (40b) ... First
Interlocking tool, (41) Switch, (42) Hot water switching operation tool (tap water temperature adjusting tool), (46) Second interlocking tool.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24H 1/10

Claims (2)

(57) [Claims] 1. A water faucet (10) for intermittently supplying water to a water pipe type water heating heat exchanger (3), a fuel valve (17) for intermittently supplying fuel to a burner (4), and the burner (10). An instantaneous water heater provided with an ignition device (23) for 4), wherein a push button type hot water supply operation tool (35) and a hot water switching operation tool (42)
The water tap (10) is opened in conjunction with the pushing operation of the hot water supply operation tool (35) to the ON state, and the hot water supply operation tool (35) is opened.
A mechanical faucet-side linkage mechanism for closing the faucet (10) in association with the operation to the OFF state is provided, and when an ignition command is issued, the fuel valve (17) is opened and the ignition device ( The fuel valve (17) is activated when the ignition command is performed and the ignition command is no longer issued.
A control means (5) for closing the valve is provided, and one switch (41) is provided which is switchable between a command state in which the ignition command is commanded and a non-command state in which no command is issued, and is biased to the command state side. When the hot water supply operation tool (35) is in the OFF state, the switch (41) is mechanically held in the non-command state, and when the hot water supply operation tool (35) is in the ON state, the switch (41) is turned off. A first interlocking device (40b) for releasing the mechanical holding to the non-command state side, and the hot water switching operation device (4
When the switch (41) is in the water-side switching state, the switch (41) is mechanically held in the non-command state, and when the hot-water switching operation tool (42) is in the hot-water switching state, the switch (4) is not operated.
A second interlock (46) for releasing the mechanical holding to the non-command state side with respect to 1) is provided, the hot water supply operation tool (35) is in an ON state, and the hot water switching operation tool (42) is Only when in the hot water side switching state, the ignition command state is set, and when the hot water supply operation tool (35) is in the ON state and the hot water switching operation tool (42) is in the water side switching state, When the hot water supply operating tool (35) is in the OFF state and the hot water switching operation tool (42) is in the water side switching state, and when the hot water supply operating tool (35) is in the OFF state, and An instantaneous water heater configured to be in a non-command state in which the ignition command is not issued when the switching operation tool (42) is in the hot-water-side switching state. 2. The instant water heater according to claim 1, wherein said hot water switching operation tool (42) is also used as a tapping temperature adjusting tool.