JP2806118B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having improved tapping temperature characteristics when the operation is stopped and restarted.

[0002]

2. Description of the Related Art A conventional water heater of this type has a configuration as shown in FIG.

[0003] The water passes through the inlet water temperature detection device 1 from the water inlet, and is divided into two paths downstream of the water inlet temperature detection device 1.
The water passes through the water amount detection device 2 and absorbs heat in the heat exchanger 3. The water in the other sub water passage S passes through the on-off valve 23, merges with the hot water from the main water passage M, passes through the hot water temperature detection device 5, and is discharged from the outlet. As described above, the hot water heated by the heat exchanger 3 and the water flowing through the sub water passage S are mixed to obtain a large amount of hot water according to the capacity of the water heater.

[0004]

However, in the water heater having such a structure, as shown in FIG.
At the time of re-operation when the hot water heated by the heat exchanger 3 is not cooled after the operation is stopped, the heat exchanger 3
The so-called post-boil W becomes large.

[0005] As shown in FIG. 4, when the operation is stopped and the hot water heated by the heat exchanger 3 is cooled again, the so-called pre-cooling D increases, and the shower and the like become large. There was a problem that the hot water supply characteristics at the time of intermittent use deteriorated.

In order to solve the above-mentioned conventional problems, the present invention provides an easy-to-use water heater having excellent hot water supply characteristics during intermittent use by reducing after-boiling and pre-cooling during re-operation. The purpose is to:

[0007]

In order to achieve the above object, a first means of the water heater according to the present invention comprises a water amount detecting device for detecting an operation state by detecting a water flow rate and a heat exchange for heating water. A main water passage having a heat exchanger temperature detecting device for sequentially detecting the hot water temperature of the heat exchanger and the downstream side, a plurality of parallel water passages having different passage diameters, and a plurality of opening and closing the parallel water passages. A sub-water passage having an on-off valve and connected to an upstream side of the water amount detection device and a downstream side of the heat exchanger temperature detection device, and a tap water temperature detection device provided in a combined water passage where the two water passages merge. A plurality of on-off valves for detecting operation stop by a signal of the water amount detection device, and for opening and closing the plurality of parallel water passages having different passage diameters when detecting operation start by a signal of the water amount detection device within a predetermined time. The heat exchanger temperature detector and the tapping temperature Those with an on-off valve control means for controlling the signal output device.

[0008] The second means of the present invention detects an operation stop by a signal of the water amount detection device, and detects an operation start by a signal of the water amount detection device within a predetermined time.
A plurality of on-off valves for opening and closing the plurality of parallel water passages having different passage diameters are provided in the vessel, and the on-off valves are controlled by a signal of an inside temperature detection device for detecting an inside atmosphere temperature and a signal of the hot water temperature detection device. It is provided with control means.

[0009]

According to the first aspect of the present invention, when the operation is restarted within a predetermined time after the stoppage of the operation, the signal of the heat exchanger temperature detecting device is used to appropriately control the temperature of the hot water in the heat exchanger. By selectively opening and closing the on-off valve of the parallel water passage having a passage diameter and selectively opening the plurality of on-off valves according to a signal from the tapping water temperature detection device, after-boiling and pre-cooling during re-operation are reduced. As a result, it becomes an easy-to-use water heater having excellent hot water supply characteristics at the time of intermittent use such as a shower.

[0010] Further, by the above-mentioned second means, when the operation is restarted within a predetermined time after the stoppage of operation, the temperature drop of the hot water in the heat exchanger can be estimated from the inside atmosphere temperature. By opening the open / close valve of the parallel water passage having an appropriate passage diameter by the signal of the above, and selectively opening the plurality of open / close valves by the signal of the tapping temperature detecting device, the post-boiling and pre-cooling at the time of re-operation. And a convenient water heater having excellent hot water supply characteristics at the time of intermittent use such as a shower.

[0011]

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

FIG. 1 shows a first embodiment, in which water passes through a water inlet temperature detection device 1 from a water inlet, and is divided into two paths downstream of the water inlet temperature detection device. And heat is absorbed by the heat exchanger 3. The water in the parallel water passage S1 provided in the other sub water passage passes through the on-off valve 6, the water in the parallel water passage S2 passes through the on-off valve 7, and merges with the hot water from the main water passage M. As a result, hot water is discharged from the exit. The passage diameters of the parallel water passages S1 and S2 are S2> S1, and the on-off valves 6, 7 provided in the respective passages S1, S2 are controlled by the on-off valve control means 16. The gas passes through the main solenoid valve 8 and the gas proportional valve 9 from the gas inlet, and is burned by the burner 10 by the combustion air fan 11.

The operation of the water heater is started by the operation switch 18 of the external input device 17, and the set temperature is input by the temperature switches 19, 20 and 21 of the external input device 17. When the water amount signal is input by the water amount detection device 2,
The water heater starts burning, and the on / off valve control means 16 “opens” the on / off valve 6 of the parallel water passage S1 and the on / off valve 7 of the parallel water passage S2.
Based on signals from the incoming water temperature detecting device 1, the water amount detecting device 2, the hot water temperature detecting device 5, and the external input device 17, the gas source solenoid valve 8, the gas proportional valve 9, and the combustion The air fan 11 is driven. In this case, the hot water heated by the heat exchanger 3 in the main water passage M is supplied to the parallel water passage S1.
And the hot water becomes hotter than the tapping temperature in accordance with the amount of water flowing through S2.

When the faucet is closed and the water level signal of the water level detector 2 disappears and the water heater stops burning, the on-off valve control means 1
Reference numeral 6 designates the on / off valve 6 of the parallel water passage S1 and the on / off valve 7 of the parallel water passage S2 as "closed". Next, when the operation is restarted within a predetermined time after the stoppage of the operation, the input signal of the heat exchanger temperature detection device 4 causes the on-off valve 6 of the parallel water passage S1 having a small passage diameter to be opened when the temperature of the heat exchanger 3 is low. When the tap water temperature reaches the set temperature according to the input signal of the tap water temperature detection device 5, the open / close valve 7 of the parallel water passage S2 is then opened.

When the temperature of the heat exchanger 3 is high, the open / close valve 7 of the parallel water passage S2 having a large passage diameter is opened, and if the tap water temperature reaches the set temperature by the input signal of the tap water temperature detecting device 5, the next Next, the on-off valve 6 of the parallel water passage S1 is set to "open". When the temperature of the heat exchanger 3 is the same as during combustion, the on-off valve 6 of the parallel water passage S1 and the on-off valve 7 of the parallel water passage S2 are simultaneously opened.

As described above, when the operation is restarted within a predetermined time after the operation is stopped, the on-off valve 6 for the parallel water passage S1 having a small passage diameter and the on-off valve 7 for the parallel water passage S2 having a large passage diameter are connected to a heat exchanger. By making it "open" according to the temperature of the temperature detecting device 4, the after-boiling W shown in 1 of FIG. 4 and the pre-cooling D shown in 3 of FIG. 4 are reduced, and as shown in FIG. It is a convenient water heater that has little after-boiling and pre-cooling during re-operation, and has excellent hot-water supply characteristics during intermittent use such as a shower.

FIG. 2 shows a second embodiment of the present invention. Compared with FIG. 1, there is no heat exchanger temperature detecting device 4, but an internal temperature detecting device 22 provided in the water heater instead. And that the opening / closing valve control means 16a operates according to the detected temperature. The operation of the water heater is started by the external input device 17.
, And the set temperature is inputted by the temperature switches 19, 20, 21 of the external input device 17. When the faucet is opened and the water amount signal is input by the water amount detection device 2, the water heater starts burning, and the on-off valve control means 16a sets the on-off valve 6 of the parallel water passage S1 and the on-off valve 7 of the parallel water passage S2 to ""Open", and based on signals from the incoming water temperature detecting device 1, the water amount detecting device 2, the hot water temperature detecting device 5, and the external input device 17, the gas source solenoid valve 8, the gas proportional valve 9, The combustion air fan 11 is driven. In this case, the hot water heated by the heat exchanger 3 in the main water passage M becomes hot water with respect to the tap water temperature in accordance with the amount of water flowing through the parallel water passages S1 and S2.

Further, when the faucet is closed and the water amount signal of the water amount detecting device 2 disappears and the water heater stops burning, the on-off valve 6 of the parallel water passage S1 and the on-off valve 7 of the parallel water passage S2 are "closed".
And Next, when the operation is restarted within a predetermined time after the stop of the operation, the temperature drop of the hot water in the heat exchanger 3 can be estimated from the ambient temperature. When the open / close valve 6 of the small parallel water passage S1 is set to “open” and the tap water temperature reaches the set temperature by the input signal of the tap water temperature detection device 5, the parallel water passage S
The second on-off valve 7 is set to “open”.

When the ambient temperature is intermediate, the open / close valve 7 of the parallel water passage S2 having a large passage diameter is opened, and when the tap water temperature reaches the set temperature by the input signal of the tap water temperature detecting device 5, the parallel water The on-off valve 6 of the passage S1 is set to “open”. When the ambient temperature is high, the on-off valve 6 of the parallel water passage S1 and the on-off valve 7 of the parallel water passage S2 are simultaneously opened.

As described above, when the operation is restarted within a predetermined time after the stoppage of operation, the on-off valve 6 of the parallel water passage S1 having a small passage diameter and the on-off valve 7 of the parallel water passage S2 having a large passage diameter are set to the internal temperature. By making it "open" according to the temperature of the detection device 22, the post-boil W shown in 1 of FIG. 4 and the pre-cooling D shown in 3 of FIG. 4 are reduced, and as shown in FIG. It is a convenient water heater that has little after-boiling and pre-cooling during re-operation, and has excellent hot-water supply characteristics during intermittent use such as a shower.

[0021]

As described above, the water heater of the present invention comprises a plurality of on-off valves for opening and closing a plurality of parallel water passages having different passage diameters in accordance with the temperature of hot water in the heat exchanger and the atmospheric temperature in the chamber. Effective control reduces the effects of post-boiling due to high-temperature hot water in the heat exchanger during re-operation after operation shutdown and pre-cooling due to temperature drop during operation shutdown, and hot water supply during intermittent use such as showers Excellent characteristics and good usability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a water heater according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the water heater of the present invention.

FIG. 3 is a configuration diagram of a conventional water heater.

FIG. 4 is a characteristic diagram of hot water supply

[Explanation of symbols]

 Reference Signs List 2 water amount detection device 3 heat exchanger 4 heat exchanger temperature detection device 5 tap water temperature detection device 6 on-off valve 7 on-off valve 16, 16a on-off valve control means 22 internal temperature detection device S1, S2 parallel water passage

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 1/10 302

Claims (2)

(57) [Claims] 1. A water amount detecting device for detecting an operation state by detecting a water flow rate, a heat exchanger for heating water, and a heat exchanger temperature detecting device for detecting a tapping temperature of the heat exchanger are sequentially directed to a downstream side. A main water passage, a plurality of parallel water passages having different passage diameters, and a plurality of on-off valves for opening and closing the parallel water passages, an upstream side of the water amount detection device and a downstream side of the heat exchanger temperature detection device a secondary water passage connected, the hot water temperature detector provided in the merging water passage merging of the two water passages provided, in hot water and use
When the faucet is closed, the operation stop is detected by the signal of the water amount detecting device, and when the faucet is opened within a predetermined time and the operation start is detected by the signal of the water amount detecting device, the plurality of parallel water passages having different passage diameters are detected. A water heater comprising on-off valve control means for controlling a plurality of on-off valves to be opened and closed by signals from the heat exchanger temperature detection device and the hot water temperature detection device. 2. An amount of water for detecting an operation state by detecting a water flow rate.
Turn the detection device and the heat exchanger that heats the water sequentially toward the downstream side
Main water passage and installed inside the vessel to detect the atmosphere temperature inside the vessel
Temperature detector and parallel water with different passage diameters
It has a passage and a plurality of on-off valves for opening and closing the parallel water passage,
Upstream side of the water amount detection device and the heat exchanger temperature detection device
Of the secondary water passage connected to the downstream side of the
Hot water supply temperature detection device installed in the junction water passage
When the faucet is closed during use, the operation stop is detected by the signal of the water amount detecting device, and when the faucet is opened within a predetermined time and the start of operation is detected by the signal of the water amount detecting device, the plurality of parallel passages having different passage diameters are detected. In front of multiple on-off valves that open and close the water passage
A water heater comprising an opening / closing valve control means for controlling with a signal from a temperature detector in a writing device and a signal from the hot water temperature detection device.