JP2550348Y2 - 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 a plurality of heat sources.

[0002]

2. Description of the Related Art A typical prior art is shown in FIG. In this prior art, water such as tap water is pressure-fed from a pipe line 3 to heat source devices 1 and 2 such as instantaneous water heaters and guided to the heat source devices 1 and 2 via solenoid valves 4 and 5, respectively. Hot water from the outlets of the heat sources 1 and 2 is guided to the hot water supply pipe 8 via the pipes 6 and 7. When the flow rate of hot water to be supplied from the hot water supply pipe 8 is small, only the heat source unit 1 is operated,
At this time, the on-off valve 4 as an electromagnetic valve is open, the heat source device 2 is at rest, and the on-off valve 5 as an electromagnetic valve is kept closed. Therefore, room temperature water is contained in the passage from the downstream side of the on-off valve 5 of the heat source unit 2 to the pipe line 7.

In this state, when the on-off valve 5 is opened and the heat source unit 2 is also operated in order to increase the flow rate of the hot water to be supplied, the heat source unit 2 is connected to the pipeline 7 downstream of the on-off valve 5. Normal temperature water in the passage leading to the hot water supply pipe 8 is mixed. Therefore, the temperature of the hot water supplied to the outside from the hot water supply pipe 8 remains low during the period in which the normal temperature water is mixed into the hot water supply pipe 8 from the pipe line 7, and a so-called cold water sandwich phenomenon occurs.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply device capable of controlling the flow rate of hot water by using a plurality of heat sources, and continuously supplying hot water having a desired temperature. It is an object of the present invention to provide a hot water supply device which can be obtained by using the hot water supply device.

[0005]

According to the present invention, there are provided a plurality of heat sources for supplying water to be heated to an inlet, a hot water supply pipe connected to each outlet of the heat sources, and A bypass which branches from an outlet of one heat source and is connected to an inlet of another heat source; and a bypass interposed in the bypass to guide hot water at the outlet of the one heat source to the inlet of the other heat source. A first valve which includes a check valve and an opening / closing valve provided at an inlet of the other heat source device at an upstream side of a connection position with a bypass path, wherein the first heat source device is operated and the opening / closing valve is closed; A hot water supply apparatus comprising: an operating state; and means for performing a second operating state in which the other heat source unit is operated while the one heat source unit is operated, and the on-off valve is opened. .

Further, the present invention provides a plurality of heat source units respectively supplied to an inlet to be heated, a hot water supply pipe connected to each outlet of the heat source unit, and a branch from the outlet of each heat source unit. A bypass passage sequentially connected to an inlet of the heat source device, a plurality of check valves interposed in the bypass passage and guiding hot water at the outlet of each heat source device to the inlet of each of the other heat source devices, and each heat source device A plurality of on-off valves respectively provided at the inlet of the bypass path at a position upstream of the connection position, and one or more heat source devices are operated, and the on-off valves corresponding to the operating heat source devices are opened, and Means for stopping the remaining heat sources, closing on-off valves corresponding to the stopped heat sources, sequentially selecting the heat sources to be operated, and substantially equalizing the operation time of each heat source. A hot water supply device characterized by That.

[0007]

According to the structure described in claim 1 of the present invention,
In the first operating state in which one heat source device is operated and the on-off valve is closed, hot water from the one heat source device is supplied to the hot water supply pipe. The part is guided to the inlet of the other heat source device via a bypass passage and a check valve interposed in the bypass passage, and hot water is guided to the hot water supply pipe via the other heat source device. Therefore,
For example, water at room temperature does not remain in the other heat source. Therefore, in order to increase the flow rate of hot water, when the other heat source device is also operated and the on-off valve is opened, hot water having a desired temperature can be continuously obtained at a large flow rate from the hot water supply pipe. Become like Thereby, the cold water sandwich phenomenon can be suppressed.

Further, according to the present invention, the hot water from the outlet of each of the plurality of heat sources branches off and is sequentially connected to the inlet of each of the other heat sources via each of the bypass passages. By controlling the operation of the water heater and the operation of an on-off valve such as an electromagnetic valve associated therewith, the flow rate of the hot water supplied from the hot water supply pipe can be varied. Especially in the present invention,
The heat source units to be operated are sequentially selected, so that the operation time of each heat source unit is made substantially equal, so that the time when the life of each heat source unit comes to be almost the same, and maintenance is easy. Becomes

[0009]

FIG. 1 is an overall system diagram of an embodiment of the present invention.

[0010] Heat source devices 11, such as a plurality of instantaneous water heaters,
The heat source units 11 and 12 are provided with heat transfer tubes 1.
3, 14 and gas burners 15, 16 for heating them. Water to be heated is supplied to an inlet 17 of the heat transfer pipe 13 from a water supply pipe 18 via a pipe 19 and an on-off valve 20 which is an electromagnetic valve. Hot water from an outlet 21 of the heat transfer tube 13 is supplied to a hot water supply pipe 24 from a pipe 22 through a throttle 23. The other heat source unit 12 is similarly configured, and the inlet 25 of the heat transfer pipe 14 is connected to the water supply pipe 18 via a pipe 26 and an on-off valve 27, and the outlet 28 of the heat transfer pipe 14 is connected to a pipe 29 and a throttle. Through 30, it is connected to the hot water supply pipe 24.

One of the heat source units 11 and 12
A bypass path 31 is connected to one outlet 21, and a check valve 32 is interposed in the bypass path 31, and the bypass path 31 is connected to an inlet 25 of another heat source device 12.
An on-off valve 27 is arranged upstream of a connection position 33 of the inlet 25 with the bypass passage 31. Another heat source 12
Also, the hot water at the outlet 28 is connected to the inlet 17 at the connection position 36 via the bypass 34 and the check valve 35. The on-off valve 20 is located upstream of the connection position 36.
0 is placed. The control circuit 37 controls the on-off valves 20 and 27 in response to the output from the flow switch 38 provided in the water supply pipe 18. The flow switch 38 detects when water flows in the water supply pipe 18 and detects the flow rate of the water.

FIG. 2 is a diagram for explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a flowchart for explaining the operation of the processing circuit 37. Referring to these drawings, in the range of time t1 to t2 in FIG.
4, when it becomes necessary to supply hot water, the on-off valve 20 in the heat source device 11 opens as shown in FIG.
In step a1, the burner 15 is in a combustion state, and the heat source unit 11 supplies hot water. Hot water from the heat transfer tube 13 is supplied from an outlet 21 through a conduit 22 to a hot water supply tube 24. Hot water pipe 2
The flow rate Q of the hot water supplied from the
When it is determined in step a2 that the detected flow rate Q is less than the predetermined flow rate Q1 in the processing circuit 37, the on-off valve 27 of the other heat source device 12 is turned on in FIG. Remain closed as shown in FIG. The hot water from the outlet 21 of the heat source unit 11 is supplied to the hot water supply pipe 24 from the heat transfer tube 14 of the other heat source unit 12 via the bypass line 31 and the check valve 32 via the pipe line 29. This check valve 32 is, as described above, the one shown in FIG.
Is open as shown in FIG.
Is closed as described above, so that the check valve 35 is
It remains closed as shown in (5). Heat source 12
Are at rest as shown in FIG. 2 (4).

As described above, when the flow rate Q of the hot water is less than the predetermined value Q1, the hot water is supplied only from the heat source unit 11, and a part of the hot water from the outlet 21 is supplied to the heat transfer tube 14 of the other heat source unit 12. Flowing inside.

The operation during the period from time t2 to t3 will be described.
At time t2, when it is detected in step a2 that the flow rate Q detected by the flow switch 38 is equal to or more than the predetermined flow rate Q1, the process proceeds to step a3, and the processing circuit 37 performs not only the on-off valve 20 but also another one. The on-off valve 27 is opened as shown in FIG. 2 (3), and the gas burner 16 of the heat source unit 12 is ignited, whereby the hot water from the heat transfer tube 14 is also supplied to the hot water supply tube 24, and thus the flow rate exceeding the predetermined flow rate Q1 Hot water can be supplied from the hot water supply pipe 24.

At time t2, when the on-off valve 27 is opened and hot water heated by the burner 16 is supplied from the heat transfer tube 14 of the heat source unit 12, the heat transfer tube 14 is already in the heat transfer tube before time t2. Since hot water from the vessel 11 flows, water at normal temperature is not supplied to the hot water supply pipe 24,
Therefore, the temperature of the hot water in the hot water supply pipe 24 does not change. At time t3, when the hot water from hot water supply pipe 24 is shut off, processing circuit 37 shuts off on-off valves 20, 27 in response to the output of flow switch 38, extinguishes burners 15, 16 and extinguishes heat source unit 11, 26. Pause 12.

At time t4, if it is determined in step a4 that the flow rate Q detected by the flow switch 38 is less than the predetermined flow rate Q1, the process proceeds to step a5, and the processing circuit 37 sets the on-off valve 20 to the state shown in FIG. As shown in 2), the heat source device 11 is closed as shown in FIG. 2A, and step a5 is executed. At this time, heat source unit 1
2 is operating, and the hot water from the outlet 28 thereof flows through the bypass passage 34 and the check valve 35 to the heat transfer tube 13 of the heat source unit 11.
Flows to Therefore, at time t5, step a6
In step a1, it is detected that the flow rate Q has become equal to or greater than a predetermined value Q1, and in step a1, the on-off valve 20 is opened and the heat source device 11
Since the hot water is always supplied from the heat transfer pipe 13 to the hot water supply pipe 24 even when the hot water supply operation state is reached, there is no problem that the temperature of the hot water in the hot water supply pipe 24 temporarily drops. The temperature of the hot water from 24 can always be kept at the desired constant value.

In the above-described embodiment, in order to make the operating times of the heat source units 11 and 12 substantially equal and equal, the heat source unit 11 is first operated, and when the flow rate Q increases, When the flow rate decreases, the heat source device 11 is stopped, and when the flow rate increases, the heat source device 11 is operated, and when the flow rate decreases, the heat source device 12 is stopped. The operation is repeated. In this way, the heat sources 11 and 12 are sequentially selected and operated, so that each of these heat sources 1 and 12 is operated.
It becomes possible to make the operation times of the first and the second substantially equal. Therefore, the life of the heat sources 11 and 12 is made almost the same,
Further, maintenance can be facilitated.

FIG. 4 is an overall system diagram of another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts are denoted by the same reference numerals. In this embodiment, the heat sources are not only indicated by reference numerals 11 and 12, but also provided with a heat source 39, and a bypass 40 and a check valve 4 are provided.
1, and an on-off valve 42 is further provided. The processing circuit 37 controls the on-off valves 20, 27 and 42 in response to the output of the flow switch 38, so that even if the flow rate changes so as to increase, the hot water supply pipe 24 always supplies hot water having a desired temperature. Is supplied, and these three heat source devices 11, 12, and 39 are sequentially operated, and the same operation as in the above-described embodiment is performed so that the operation times are substantially equal. Heat source units 11, 12, and 39 are more numerous units,
It may be provided.

[0019]

As described above, according to the present invention, hot water from one heat source is guided to the inlet of another heat source via a bypass and a check valve, and passes through the inside of the other heat source. Since the hot water is guided to the hot water supply pipe, when the flow rate of the hot water is increased while the other heat source device is being operated,
Hot water having a desired temperature can be obtained.

In addition, according to the present invention, the number of heat source devices to be operated is selected according to the required flow rate of hot water, and the heat source devices to be operated are sequentially selected, thereby reducing the operation time of each heat source device. It can be almost even. Therefore, it becomes possible to make the time when the life of each heat source device comes almost the same, and maintenance becomes easy.

[Brief description of the drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment shown in FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the processing circuit 37 of the embodiment shown in FIG.

FIG. 4 is an overall system diagram of another embodiment of the present invention.

FIG. 5 is an overall system diagram of the prior art.

[Explanation of symbols]

 11, 12, 39 Heat source device 13, 14 Heat transfer tube 17, 25 Inlet 18 Water supply pipe 20, 27, 42 On-off valve 21, 28 Outlet 24 Hot water supply pipe 31, 34, 40 Bypass path 32, 35, 41 Check valve

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of heat source devices each of which water to be heated is supplied to an inlet, a hot water supply pipe connected to each outlet of the heat source device, and an outlet of one of the heat source devices. A bypass branched and connected to an inlet of another heat source, a check valve interposed in the bypass and guiding hot water at an outlet of the one heat source to an inlet of the other heat source; A first opening / closing valve provided at an inlet of the heat source unit, the opening / closing valve being provided at an upstream side of a connection position with the bypass passage, wherein the one heat source unit is operated and the opening / closing valve is closed;
An operating state, and then the second heat source is operated while the one heat source is operated, and the second on-off valve is opened.
And a means for performing an operation state. 2. A plurality of heat source devices respectively supplied to an inlet to be heated, a hot water supply pipe respectively connected to each outlet of the heat source device, and a branch from each heat source device outlet to each of the other heat source devices. A bypass passage sequentially connected to the inlet; a plurality of check valves interposed in the bypass passage, each of which guides hot water at the outlet of each heat source device to the inlet of each of the other heat source devices; A plurality of on-off valves provided respectively on the upstream side of a connection position with the bypass path; and operating one or more heat source devices, opening the on-off valves corresponding to the operating heat source devices, and the remaining heat source. Means for shutting down the heaters, closing the on-off valve corresponding to the paused heat source devices, sequentially selecting the heat source devices to be operated, and substantially equalizing the operation time of each heat source device. Water heater.