JPH0615934B2 - Instant water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to an instant water heater, and more specifically, to a water pipe type heat exchanger for heating water, and a burner for the water heat exchanger, which is provided to the heat exchanger. A diaphragm type water governor is installed in the water supply channel,
The fuel supply path to the burner is provided with a water pressure responsive valve that allows fuel supply to the burner only in a water supply state to the heat exchanger by interlocking with a diaphragm in the water governor,
In the water supply passage, a bypass passage branched from the downstream side of the attached location of the water governor is connected to a hot water discharge passage from the heat exchanger, and the amount of water supplied to the heat exchanger by cooperation with a hot water temperature adjuster, and The present invention relates to an instantaneous water heater provided with a valve mechanism for adjusting the outlet hot water temperature for adjusting the amount of bypass water in the bypass passage.

[Conventional technology]

Conventionally, in the above instantaneous water heater, the amount of water supplied to the heat exchanger (Q '
The _H) only bypass water (Q _B) was gradually so as to increase while keeping constant as indicated by a broken line in FIG. 9.

In addition, in the example shown in FIG. 9, for operation to the low temperature side up to a predetermined temperature (predetermined operation position), the bypass water amount (Q _B ) is kept at 0 and the heat exchanger water supply amount (Q _H ) The above-mentioned form is adopted so that only the temperature is gradually increased and the operation from the predetermined temperature (predetermined operation position) to the low temperature side end is performed.

[Problems to be Solved by the Invention]

However, the water tube heat exchanger has a larger pressure loss than the bypass passage, which is a simple flow passage, but when the tap water temperature adjustment state is at the low temperature side end, such a large pressure loss occurs in the heat exchanger. In addition, since the amount of bypass water is maximized, the pressure loss in the bypass passage and the pressure loss in the confluence of the bypass passage and the hot water outlet also increase, respectively, resulting in an extremely large overall pressure loss. When the hot water supply start operation is performed while the temperature adjustment state is near the low temperature end,
If the original water supply pressure at that time is low for some reason, it may not be possible to start hot water supply because the water pressure difference required to open the water pressure responsive valve in the diaphragm type water governor cannot be obtained. there were.

An object of the present invention is to effectively suppress the occurrence of the above situation by making a reasonable improvement.

[Means for Solving the Problems]

The characteristic configuration of the instant water heater according to the present invention is a water tube type heat exchanger for heating water, and a burner for the heat exchanger is provided, and a diaphragm type water governor is provided in a water supply path to the heat exchanger.
A fuel supply passage to the burner, a water pressure responsive valve that allows fuel supply to the burner only in a water supply state to the heat exchanger by interlocking with a diaphragm in the water governor, and the water governor is attached to the water supply passage. A bypass passage branched from the downstream side of the location is connected to the hot water outlet from the heat exchanger, and the amount of water supplied to the heat exchanger and the bypass water amount of the bypass passage are adjusted in cooperation with the hot water outlet temperature adjusting tool. In the configuration in which a valve mechanism for adjusting the outlet hot water temperature is provided, the amount of bypass water in the bypass passage is increased in accordance with the operation of the outlet hot water temperature adjuster to the low temperature side end, and the heat is increased with respect to the increase in the amount of bypass water. The outlet hot water temperature adjusting device and the valve mechanism are linked so as to reduce the amount of water supplied to the exchanger, and the action and effect thereof are as follows.

[Work]

In other words, by reducing the amount of water supplied to the heat exchanger with respect to the operation on the low temperature side end and increasing the bypass water amount, the overall pressure loss when the tapping temperature adjustment state is near the low temperature side end is The amount of water supplied to the heat exchanger where the pressure loss is most prominent is reduced, and the pressure loss in the heat exchanger is suppressed.

Due to the reduction in the overall pressure loss, a large water pressure difference can be secured in the diaphragm-type water governor even when the hot water outlet temperature adjustment state is near the low temperature side end.

〔The invention's effect〕

As a result, when starting hot water supply when the hot water outlet temperature adjustment state is near the low temperature side end, hot water supply start becomes impossible due to insufficient water pressure in the water governor caused by the decrease in the original water supply pressure. It was possible to suppress the occurrence of such a situation, and it was possible to obtain an instant oil boiling device that was extremely excellent in adaptability to fluctuations in the original water supply pressure.

〔Example〕

 Next, examples will be described.

Fig. 1 shows the overall structure of a gas instantaneous oil heater. A fin tube type water heating heat exchanger (3) and a plate burner (3) are installed in a casing (2) having an exhaust port (1) at the upper end. The burner unit (4) with the 4a) installed side by side and the controller (5) are installed inside, and the casing (2) has an inlet (6) for the combustion air.
Is provided.

(7) internalizes the heat exchanger (3), and heat exchanger (3)
And a burner unit (4) forming a combustion chamber (8).

The water supply channel (9) to the heat exchanger (3) has a faucet for intermittent water supply.
(10), a water governor (11) that keeps the water supply pressure at an appropriate pressure, and a diversion valve (12) for adjusting the oil output temperature are installed, and a heat exchanger (3)
The oil discharge path (13) from the hot water outlet is connected via the flexible pipe (14).
It is connected to (15).

Also, in the fuel gas supply path (16) to the burner unit (4),
Gas valve (17) that intermittently supplies fuel, hydraulic pressure responsive valve (18) that opens only in an appropriate water supply state by interlocking with water governor (11) via interlocking rod (18a), keeps the supply gas pressure at an appropriate pressure Gas governor
(19) and a regulating valve (20) for regulating the amount of supply gas are provided.

(21) is a pilot burner connected to the fuel gas supply passage (16) between the gas valve (17) and the hydraulically operated valve (18), and (22) is heated by the combustion flame of the pilot burner (21). Is a spark plug, (24) is a second thermocouple for detecting the exhaust air passage blockage, and (25) is a dry battery as a built-in power source.

The diverter valve (12) is used for the amount of water supplied to the heat exchanger (3) and the bypass passage.
This is to adjust the amount of bypass water that is diverted from the water supply channel (9) to the hot water discharge channel (13) via the (26). ) And the adjustment of the supply gas amount.

The water governor (11) is a diaphragm (11c) due to the differential pressure between the downstream side water pressure introduced into the secondary pressure chamber (11a) via the communication passage (27) and the upstream side water pressure in the primary pressure chamber (11b). The water supply pressure is adjusted by interlocking the governor toilet body (11d) with respect to the displacement.

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

In other words, when the pilot hole (30) is closed by the biased pilot valve body (29), the diaphragm is driven by the upstream side water pressure introduced into the diaphragm chamber (34) through the fine hole (33). The valve body (28) is kept closed, and
When the pilot hole (30) is opened by opening the pilot valve body (29) by pulling the operating rod (32) in the closed state,
Water pressure sealing in the diaphragm chamber (34) is released,
The diaphragm valve body (28) has a structure that opens due to the water pressure applied to the pressure receiving surface on the water channel side, and the pilot valve body (2
The large diameter water supply channel (9) can be opened and closed by simply operating on (9),
This has the advantage that the required operation force and the required operation amount are extremely small.

A closed urging type solenoid valve is applied to the gas valve (17).
7a) is a valve element that is constantly urged toward the closing side by a spring (17b), and (17c) is an electromagnetic coil that opens and operates the valve element (17a) against the closing urging force.

The hot water supply start and stop operations are performed by the push button type hot water supply operation tool (35) arranged on the front surface of the casing (2). The hot water supply operation tool (35) is as shown in FIGS. 2 to 5. In addition, the holding mechanism (37) provided on the rod section (36) connected to it
And a spring (38) that biases the hot water supply operation tool (35) toward the protruding side.
Due to the linkage action with, it is automatically held at the specified push-in position (b) with the pushing operation from the protruding position (a), and is pushed again while being held at the push-in position (b). Then, the holding is released and it automatically returns to the initial protruding position (a).

Regarding the operation of the faucet (10), as a mechanical interlocking mechanism for operating the faucet, when the hot water supply operation tool (35) is pushed from the protruding position (a), the contact with the tip of the rod part (36) is performed. A first swing member (40) that swings around the first axis (P ₁ ) against the biasing force of the return spring (39) by contact is provided.
Fork part (40a) that pulls and operates the operating rod (32) of the pilot diaphragm type water faucet (10) at the tip of (0).
Is provided.

That is, the operation rod (32) is pulled by the swing of the first swing member (40) accompanying the push operation of the hot water supply operation tool (35) from the protruding position (a) to open the faucet (10). And, by holding the hot water supply operation tool (35) at the pushed-in position (b), the operating rod (32) is pulled and kept in the open state to hold the faucet (10) in the open state, and the hot water supply operation tool When (35) is returned to the projecting position (a) by pushing again, the first swinging member (40) is returned to swing by the biasing force of the return spring (39) to pull the operating rod (32). The operation is released to close the water faucet (10).

On the other hand, regarding the operation of the gas valve (17), a micro switch (41) which is turned off by pushing the operation piece (41a) against the urging force is provided, and the first swing member (40) is provided.
In addition, the operating piece (41a) is pushed by the biasing force of the return spring (39).
A switch operation part (40b) that turns off the micro switch (41) by pressing is connected in series, and gas is supplied to the controller (5) based on the ON / OFF of the ignition command circuit depending on the ON / OFF of the micro switch (41). The opening / closing operation of the valve (17) is executed.

That is, when the hot water supply operation tool (35) is pushed from the projecting position (a), the switch operation part (40b) is released from the operation piece (41a) by the associated swing of the first swing member (40). Then, the micro switch (41) is turned on, and based on this turning on, the controller (5) is caused to open the gas valve (17), and the hot water supply operation tool (35) is pushed to the projecting position by pressing it again.
When it is returned to (a), the switch operating part (40b) presses the operation piece (41a) along with the return swing of the first swing member (40) by the biasing force of the return spring (39), and The switch (41) is turned off, and the gas valve (1
The controller (5) is made to execute the closing operation of (7).

In the controller (5), (5A) is the microswitch (4
Based on ON of 1), dry battery (25) to gas valve electromagnetic coil (1
7c) Opening the valve to start power supply to open the gas valve (17), and to give an operation command to the ignition circuit (5B) to set the ignition plug (23) by supplying power from the dry cell (25). Time (T ₁ )
Only the spark is operated, and based on the turning off of the micro switch (41), the dry battery (25) changes the gas valve electromagnetic coil (17).
This is an operation circuit that shuts off the power supply to c) and closes the gas valve (17) by urging force.
(5A) In addition to the above basic operation function, when the electromotive force of the first thermocouple (22) exceeds the set value within the set ignition time (T ₁ ) due to ignition of the pilot burner (21), Even after the set ignition time (T ₁ ) has elapsed, the valve opening operation power supply to the gas valve electromagnetic coil (17c) continues, and the gas valve (1c
7) is kept open, but when the electromotive force of the first thermocouple (22) does not reach the set value within the set ignition time (T ₁ ) due to misfiring, the set ignition time (T ₁ ), The valve opening operation power supply to the gas valve electromagnetic coil (17c) is cut off and the gas valve
(17) is closed by a biasing force to automatically close the valve, and it is incomplete due to oxygen deficiency, etc., during the combustion operation in which the valve opening operation power is continuously supplied to the gas valve electromagnetic coil (17c). When the electromotive force of the first thermocouple (22) falls below the set value due to the decrease in the heating effect of the pilot burner (21) on the first couple (22) due to the occurrence of combustion, the gas valve solenoid Open the valve to the coil (17c).
(17) is equipped with each of the shut-off functions at the time of incomplete combustion that automatically closes the valve by the biasing force.These functions enable the leakage of raw gas at mis-ignition and the continuous operation in the incomplete combustion state. To prevent it.

In summary, for hot water supply operation, push the push-button hot water supply operation tool (35) from the protruding position (a) to operate the faucet (1
(0) is opened by mechanical movement to start water supply, and when the micro switch (41) is turned on, the spark plug (2
Unless the gas valve (17) is opened and the burner unit (4) and the pyro-burner (21) are ignited and the gas valve (17) is not automatically closed due to misfiring, Hot water supply is started by.

Further, after the hot water supply is started, while the hot water supply operation tool (35) is held at the push-in position (b), the holding keeps the faucet (10) mechanically open, and the micro switch ( 41) ON
By maintaining the state, the gas valve (17) is kept in the open state, whereby hot water supply is continued unless the gas valve (17) is automatically closed due to incomplete combustion.

After that, the hot water supply operation tool (3
When 5) is returned to the projecting position (a) by pushing again, the water faucet (10) is closed by mechanical movement to stop water supply, and the gas valve (17) is turned off when the micro switch (41) is turned off.
The burner unit (4) and pilot burner
Even if (21) is extinguished, hot water supply is stopped.

In addition to the operation circuit (5A) and the ignition circuit (5B), the controller (5) has a flashback prevention circuit (5C) to prevent flashback during re-ignition of the burner unit (4). Along with the provision of a blockage operation prevention circuit (5D) for preventing the incomplete combustion caused by blockage of the exhaust air passage, the flashback prevention circuit (5C) is specifically provided with a micro switch (41 ) Is O
The setting time limit (T ₂ ) is counted by the timer (TM) from the time when FF is performed, and when the micro switch (41) is turned on again during the counting of the setting time limit (T ₂ ), the ON signal Controller as ignition operation command
(5) It is intended to prevent acceptance into the inside.

That is, when the micro switch (41) is turned off, the gas valve
Immediately after the valve (17) is closed, there is a possibility that the afterglow may have entered and remained inside the flame holes of each plate burner (4a) due to the stoppage of gas ejection in the burner unit (4). When the gas valve (17) is opened again in such an afterglow state, the spark plug (23) sparks, and the combustion that should have been started at the outlet of the flamehole is started inside the flamehole due to the afterglow. As a result, a so-called flashback phenomenon occurs.

Therefore, the above flashback prevention circuit (5C) is provided, and the hot water supply operation tool (35)
Even if the hot water supply operation tool (35) is pushed again immediately after the hot water supply is stopped after the water tank is once returned to the projecting position (a), the setting is made from the OFF point of the micro switch (41) during the previous return operation. time limit (T ₂₎ in the by preventing acceptance of oN signal, opening operation of the setting time limit (T ₂₎ within the gas valve (17) is that is not performed, for remaining fire is completely extinguishing It takes time to prevent the above flashback phenomenon 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 exhaust airway blockage detection second thermocouple (24) exceeds the set value. The second thermocouple (24) is cut off as shown in FIGS. 6 and 7.
It is placed outside the barrel (7) so that it faces the detection opening (7a) that connects the upper part of the combustion chamber (8) and the outside of the barrel (7). When the exhaust airflow path is blocked, such as when it is blocked, it is exposed to the high-temperature combustion gas that flows out from the detection opening (7a) due to the overheating in the combustion chamber (8) and the increase in the chamber pressure due to the blockage. The electromotive force of the second thermocouple (24) is increased.

That is, based on the detection of the exhaust air passage blockage by the second thermocouple (24) as described above, the valve opening operation power supply to the gas valve electromagnetic coil (17c) is cut off and the gas valve (17) is closed by the urging force. The valve is automatically closed to prevent the occurrence of incomplete combustion caused by the blockage of the exhaust air passage such as the blockage of the heat exchanger and the neglected state.

The hot water temperature adjustment by operating the diversion valve (12) and the adjusting valve (20) is performed by the dial type temperature adjusting tool (42) arranged on the outer periphery of the push button hot water supply operating tool (35). Yes, a donut type rotating body (43) that rotates integrally with the temperature adjustment tool (42)
Is provided, and the gear part (43a) is provided in a part of the peripheral part of the rotating body (43).
And the fan-shaped gear (44) connected to the rotary operation shaft (12a) of the flow dividing valve (12) is engaged with the gear part (43a) of the rotating body (43), and thus the temperature adjusting tool (42) is formed. And the shunt valve (12) are interlocked.

Also, regarding the interlocking of the temperature adjusting tool (42) and the adjusting valve (20),
Adjusting valve (20), valve body (20a), spring (20b) for urging the valve body (20a) toward the valve opening side, and valve body (20a) against the urging force of spring (20b). Operation rod that pushes to close the valve
(20c) as a lift type valve, and its operating rod (2
0c) is pushed by swinging around the first axis (P ₂ )
The oscillating member (45) is provided, and the rotator is attached to the back surface of the rotator (43) by abutting against one end of the second oscillating member (45).
(43) There is provided a first cam (43b) for swinging the second swing member (45) to the operating rod pushing operation side with the rotation to one side,
Therefore, with the rotation of the temperature adjustment tool (42) to one side, the adjustment valve
(20) is operated toward the valve closing side against the valve opening biasing force of the spring (20b), and the adjusting valve (20) is rotated by the rotation of the temperature adjusting tool (42) to the other side, and the spring (20b) It is designed to be operated toward the valve opening side by the urging force of.

As for the interlocking relationship, with respect to the rotation operation of the temperature adjusting tool (42) to the side that closes the adjustment valve (20), the flow dividing valve (12) is interlocked to the side that increases the bypass water amount. Thus, when the dial type temperature adjusting tool (42) is rotated to one side, the adjusting valve (20) is operated to the closing side and the diversion valve (12) is to the bypass water amount increasing side. If the temperature control tool (42) is rotated to the other side so that the tap water temperature is lowered by operating it, the adjustment valve (20) is operated to the valve opening side and the diversion valve (12) is set to the bypass water amount. It is designed to operate on the decreasing side to raise the hot water temperature.

In addition to the hot water temperature adjusting function described above, at one end of the rotary operation range of the temperature adjusting tool (42), the burner unit (4) and pilot burner (21) are extinguished during the hot water supply operation to simply discharge water. ) Is provided with a water discharge position, and as an operation structure for expressing such a water discharge state,
Micro switch (41) by swinging around the third axis (P ₃ ).
The third swinging member (46) for pushing and operating the operation piece (41a) is provided side by side next to the switch operating portion (40b) of the first swinging member (40), and on the back surface of the rotating body (43), The second swinging member (46) swinging the third swinging member (46) toward the operation piece pushing operation side by contact with one end of the third swinging member (46) when the temperature adjusting tool (42) is rotated to the water discharge position. A cam (43c) 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 first swinging member (40))
In the state where the pressing of the operation piece (41a) by the switch operation part (40b) of the is released and the micro switch (41) is ON), the dial type temperature adjusting tool (42) is rotated to the water pouring position. Then, the third by contact of the second cam (43c)
The operating piece (4
1a) is pushed to turn off the micro switch (41), which causes the gas valve (17) to close and the burner unit (4) and pilot burner (21) to extinguish, so that the water condition appears. It is done.

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 adjusting tool (42) is again rotated from the water discharge position into the hot water temperature adjustment range, the third swinging motion occurs. When the contact of the second cam (43c) with the moving member (46) is released, the operation pushing operation of the third swinging member (46) is released and the micro switch (41) is turned on by the self-urging force.
After that, the gas valve (17) is opened by the operation of the controller (5) and the spark plug (23) is sparked to operate the burner unit (4) and the pilot burner when the hot water supply is started. (21) is set to reignite. That is, it is possible to return from the water discharge state to the hot water supply state only by the operation of returning the temperature adjusting tool (42).

The flow dividing valve (12) which is rotated by the temperature adjusting tool (42) is the eighth
As shown in the figure, connect the upstream water supply channel (9a) to the heat exchanger (3) on the bottomed cylindrical rotary valve body (12b) connected to the rotary operation shaft (12a).
To the downstream water supply channel (9b) to the first flow path hole (12c),
A second flow passage hole (12d) that connects the upstream water supply passage (9a) to the bypass passage (26) is formed, and the first flow passage hole (12c) and the downstream water supply passage are formed.
The rotary valve body (12b) has an overlapping state with the inlet of (9b) and an overlapping state of the second flow passage hole (12d) and the inlet of 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 rotational operation of.

And as a concrete water amount change adjustment mode, the first flow path hole
As shown in FIG. 9, the temperature adjusting tool (4c) and the second flow path hole (12d) are set by setting the respective shapes and relative positional relationships.
As 2) is rotated from the high temperature side end to the low temperature side, the bypass water amount (Q _B ) is kept at 0 up to a certain intermediate temperature and the heat exchanger
Only the amount of water supplied to (3) (Q _H ) is gradually increased, and the amount of water supplied to the heat exchanger (3) (Q _H ) is increased for rotational operation from the intermediate temperature to a lower temperature side. While gradually decreasing, the bypass water amount (Q _B ) is increased, and the total water amount (Q _H + Q _B ) is gradually increased with the heat exchanger feed water amount (Q _H ) increasing up to the intermediate temperature. I am allowed to do it.

In other words, in the fin-tube type heat exchanger (3), the pipe line is meandering and long, so the pressure loss due to the increase in the amount of water supply is remarkable compared to the bypass line (26). When the temperature regulation is at the cold end, in addition to such a large pressure drop (ΔP _H ) in the heat exchanger (3) the bypass line
Since the pressure loss (ΔP _B ) at (26) and the pressure loss (ΔP _M ) at the confluence of the bypass passage (26) and the tap water passage (13) are also large, the total pressure loss (ΔP = ΔP _H + ΔP _B + ΔP _M ) becomes extremely large. Therefore, if the hot water supply start operation is performed while the hot water temperature adjustment state is near the low temperature side end, the original water supply pressure at that time is low for some reason. In some cases, the hot water supply start cannot be executed because the sufficient water pressure difference required to open the water pressure responsive valve (18) cannot be obtained in the water governor (11).

Therefore, as described above, when adjusting the outlet temperature from an intermediate temperature to a lower temperature side, the bypass water amount (Q _B ) is increased while the heat exchanger feed water amount (Q _H ) is decreased to increase the total water amount (Q _H + Q _B ) Is gradually increased so that the heat exchanger water supply amount (Q ′ = _H ) is simply kept constant after the intermediate temperature as shown by the broken line in FIG. 9. In comparison with, the total pressure loss (ΔP = ΔP _H + ΔP _B + ΔP _M ) when the tap water temperature adjustment state is near the low temperature end is calculated by the amount of water supplied to the heat exchanger (3) where the pressure loss is most noticeable. (Q _H ) can be effectively reduced by suppressing the occurrence of a situation in which hot water supply cannot be started due to insufficient water pressure difference in the water governor (11) as described above. , The improvement of the adaptability to the fluctuation of the original water supply pressure.

Note that, in FIG. 10, G indicates a change mode of the gas supply amount with respect to the rotation operation of the temperature adjusting tool (42).

[Another embodiment]

 Next, another embodiment will be described.

A dedicated valve for adjusting the amount of water in the heat exchanger and a dedicated valve for adjusting the amount of bypass water may be provided, and both of these dedicated valves and the tap water temperature adjusting device may be linked together. Also, various improvements can be made to the specific structure of the valve mechanism that adjusts the amount of bypass water.

With the operation of the outlet hot water temperature adjuster to the low temperature side end, the outlet hot water temperature adjuster and the valve mechanism are arranged so as to increase the amount of bypass water and to decrease the heat exchanger water supply amount with respect to the increase of the amount of bypass water. Various improvements can be made to the specific linking structure for linking.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 to 10 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram of an instantaneous water heater, and FIGS. 2 to 5 are schematic diagrams showing an operating structure, FIG. 6 and FIG. The drawing 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, (9) …… Water supply channel, (1
1) …… Water governor, (11c) …… Diaphragm, (12) …… Valve mechanism, (13) …… Outlet passage, (16) …… Fuel supply passage, (18) ……
Water pressure responsive valve, (26) …… Bypass passage, (42) …… Hot water temperature adjusting device, (Q _H ) …… Heat exchanger water supply amount, (Q _B ) …… Bypass water amount.

Claims (1)

[Claims] 1. A water pipe type heat exchanger for water heating (3) and a burner (4) for the heat exchanger are provided, and a diaphragm type water governor (9) is provided in a water supply passage (9) to the heat exchanger (3). 11) is provided, and the heat exchanger is linked to the fuel supply passage (16) to the burner (4) by interlocking with the diaphragm (11c) of the water governor (11).
A water pressure responsive valve (18) that allows fuel to be supplied to the burner (4) only when the water is being supplied to (3) is provided, and the water supply passage (9) is provided from a downstream side of the location where the water governor (11) is attached. The branched bypass path (26) is connected to the hot water discharge path (13) from the heat exchanger (3), and the heat exchanger is operated in cooperation with the hot water temperature control tool (42).
An instantaneous water heater equipped with a valve mechanism (12) for adjusting the amount of water supplied to (3) (Q _H ) and the amount of bypass water (Q _B ) in the bypass passage (26). With the operation of the outlet hot water temperature adjuster (42) to the low temperature side end, the bypass water amount (Q _B ) of the bypass passage (26) is increased, and the bypass water amount (Q _B ) is increased. The outlet hot water temperature adjuster (42) and the valve mechanism (12) so as to reduce the amount of water supply (Q _H ) to the heat exchanger (3).
An instant water heater that links with.