JP3800412B2 - Linked hot water system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connected hot water supply system, and more particularly to a configuration in which a closing source valve for closing a hot water discharge pipe of each water heater can be omitted.
[0002]
[Prior art]
Conventionally, in various facilities such as hospitals, multiple water heaters are connected in parallel because it is easy to follow large fluctuations in the amount of hot water supply and it is possible to back up when a water heater fails. A commercial hot water supply system may be used. For example, a connected hot water supply system 100 as shown in FIG. 7 is configured by connecting two water heaters Ha and Hb in parallel. Each of the water heaters Ha and Hb includes a water supply pipe 101 and a hot water pipe 102, and a heat exchanger. 103, and a bypass pipe 104 that bypasses the heat exchanger 103 and connects the water supply pipe 101 and the hot water pipe 102.
[0003]
The outlet pipe 102 is provided with a hot water adjustment valve 105 that adjusts the amount of hot water flowing from the heat exchanger 103 to the outlet pipe 102, and the bypass pipe 104 has a bypass water amount adjustment valve 106 that adjusts the amount of bypass water flowing through the bypass pipe 104. Is provided. The control units 107 of the hot water heaters Ha and Hb control the regulating valves 105 and 106 so that the hot water temperature becomes a predetermined value input from the remote controller 111.
[0004]
On the downstream side of the hot water amount adjusting valve 105 and the bypass water amount adjusting valve 106, an electromagnetic valve 108 (closing source valve) for closing the hot water discharge pipe 102 is provided. Here, as shown in FIG. 7, for example, when the water heater Ha fails, the control unit 107 of the water heater Ha closes the electromagnetic valve 108, so that the water flowing out from the water heater Ha flows out from the water heater Hb. The hot water temperature of the entire system does not drop when mixed with hot water.
[0005]
Here, when inspecting and repairing the defective water heaters Ha and Hb, or when the water heaters Ha and Hb are not used for a long period of time in winter when the water in the water heater may be frozen, the water heater Ha is used. , Hb, it is necessary to configure the connected hot water supply system 100 so that water can be extracted. Therefore, drain valves 109 and 110 are provided on the upstream side and the downstream side of the hot water amount adjusting valve 105 and the bypass water amount adjusting valve 106, respectively.
[0006]
As described above, when the water heaters Ha and Hb fail, the solenoid valves 108 of the failed water heaters Ha and Hb are in a closed state, and water does not flow out of the water heaters Ha and Hb. There is no particular problem even if the water amount adjustment valve 106 is open. If the hot water adjustment valve 105 and the bypass water amount adjustment valve 106 are open as described above, the water drain valves 109 and 110 can be opened to completely drain the water inside the water heaters Ha and Hb.
[0007]
[Problems to be solved by the invention]
Here, the applicant of the present application is considering omitting the electromagnetic valve of each water heater for the purpose of reducing the cost of the connected hot water system. However, in this case, it is necessary to configure both the hot water amount adjustment valve and the bypass water amount adjustment valve so that water does not flow out of the water heater when the water heater fails.
[0008]
However, in this case, since both the hot water amount adjustment valve and the bypass water amount adjustment valve are closed when the water heater fails, even if the drain valve is opened, some water remains in the water heater, It becomes impossible to drain water completely from the water heater.
An object of the present invention is to provide a connected hot water supply system capable of draining water in a water heater even if a closing valve for closing a hot water outlet pipe of each water heater is omitted.
[0009]
[Means for Solving the Problems]
The connected hot water supply system according to claim 1 connects a plurality of water heaters in parallel with a water supply pipe and a hot water discharge pipe, a heat exchanger, and a bypass pipe that bypasses the heat exchanger and connects the water supply pipe and the hot water discharge pipe. In each of the connected hot water systems, each water heater includes a hot water adjustment valve that adjusts the amount of hot water flowing from the heat exchanger to the outlet pipe, a bypass water amount adjustment valve that adjusts the amount of bypass water flowing through the bypass pipe, and a closure that closes the outlet pipe. And a control means for controlling the hot water amount adjusting valve and the bypass water amount adjusting valve so as to share the role of the main valve, and each of the control means has a failure due to a failure of any one of the plurality of hot water heaters. When a failure signal indicating that the water heater has failed is input to the control means of the hot water heater , both the hot water amount adjustment valve and the bypass water amount adjustment valve of the failed water heater are closed, and all the water heaters fault signal to the control means When it is force, it is characterized in that it has been configured to open both the hot water control valve and the bypass water amount adjustment valve for all water heater.
[0010]
By configuring the connected hot water supply system in this manner, it is possible to omit the closing source valve by having the hot water amount adjusting valve and the bypass water amount adjusting valve also serve as a closing source valve for closing the hot water discharge pipe .
[0011]
If one of the water heaters fails and a fault signal is input to the control unit of the faulty water heater, water flows out of the faulty water heater and the temperature of the hot water in the system decreases. In order to prevent this, the control means closes both the hot water amount adjusting valve and the bypass water amount adjusting valve.
[0012]
However, when a failure signal is input to all the control means, all the water heaters are in a failed state. Therefore, both the hot water amount adjustment valve and the bypass water amount adjustment valve are closed, and the hot water pipe is filled with water. There is no need to prevent spills. Therefore, each control means opens both the hot water amount adjusting valve and the bypass adjusting valve of the water heater to be controlled. As described above, when the hot water amount adjusting valve and the bypass adjusting valve are opened, the water in the water heater can be completely drained by opening the drain valve provided in each water heater.
[0013]
[0014]
[0015]
According to a second aspect of the present invention, there is provided the connected hot water supply system according to the first aspect of the present invention, wherein a common remote controller capable of operating the plurality of control means is provided, and a remote controller capable of outputting the predetermined signal is provided. It is what. Therefore, by inputting a predetermined signal from the common remote controller to the control means of all the water heaters, both the hot water amount adjustment valve and the bypass adjustment valve of all the water heaters are opened, and the water in the water heater is drained. It becomes possible.
[0016]
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described. In this embodiment, the present invention is applied to a connected hot water system in which two water heaters are connected in parallel.
As shown in FIGS. 2 to 5, the connected hot water supply system 1 includes two hot water heaters H1 and H2. First, the hot water heaters H1 and H2 will be described. However, since the two water heaters H1 and H2 have the same configuration, the water heater H1 will be described.
[0018]
As shown in FIG. 1, the water heater H <b> 1 includes a water heater body 2, a water supply pipe 3 that supplies water to the water heater body 2, a hot water discharge pipe 4 that is discharged from the water heater body 2, and a heat exchange between the water heater body 2. A bypass pipe 5 that bypasses the water heater 10 and connects the hot water supply pipe 4 to the hot water supply pipe 3, a gas supply pipe 6 that supplies fuel gas to the hot water heater body 2, and a control unit 7a that controls the water heater H1 (control means) Equivalent to).
[0019]
The water heater body 2 includes a heat exchanger 10 connected to the water supply pipe 3 and the hot water discharge pipe 4, a burner 11 having a plurality of combustion pipes for burning fuel gas, a spark plug 12, a extinguishing safety device 13, A burner temperature sensor 14 and a blower fan 15 for sending combustion air to the burner 11 are provided.
The water supply pipe 3 is connected to the water supply port 20 and extends to the heat exchanger 10, and the water supply pipe 3 is provided with a water supply amount sensor 21 and a temperature sensor 22.
[0020]
The tapping pipe 4 extends from the heat exchanger 10 and is connected to a tapping port 23. The outlet pipe 4 is provided with a temperature sensor 25 for detecting the temperature of hot water flowing out from the heat exchanger and a hot water amount adjusting valve 26a for adjusting the amount of hot water on the upstream side of the junction with the bypass pipe 5, A temperature sensor 27 that detects the temperature of hot water coming out of the hot water outlet port 23 is provided on the downstream side of the junction with the pipe 5.
[0021]
The bypass pipe 5 is provided with a bypass water amount adjustment valve 28a for adjusting the amount of bypass water flowing through the bypass pipe 5, and the bypass water amount is adjusted by the bypass water amount adjustment valve 28a to finely adjust the tapping temperature.
The gas supply pipe 6 is connected to the gas supply port 29 of the fuel gas supply source and extends to the burner 11. The gas supply pipe 6 has a gas main valve 30 for cutting off the supply of the fuel gas, and a flow rate of the fuel gas. A gas flow rate sensor 31 for detection and a gas proportional control valve 32 for adjusting the fuel gas flow rate for controlling the load of the burner 11 are provided.
[0022]
Detection signals from the temperature sensors 22, 25, 27, the water supply amount sensor 21, the flow rate sensor 31, and the like are input to the control unit 7a. The control unit 7a, based on these signals, controls the hot water amount adjustment valve 26a and the bypass water amount adjustment valve. 28 a, the gas proportional control valve 32 is controlled, or a combustion tube switching command is output to the burner 11. In addition, as will be described later, the control unit 7a is connected to the control unit 7b of the water heater H2 via the communication cable 33. Further, the control unit 7a is operated by the remote controller 34 described later to operate the water heater H1. These various signals are input.
[0023]
Next, the connected hot water supply system 1 formed by connecting the two hot water heaters H1 and H2 in parallel will be described.
As shown in FIGS. 2 to 5, in the connected hot water supply system 1, the water supply pipes 3 of the water heaters H <b> 1 and H <b> 2 are connected to a water supply source (not shown) by a water supply main pipe 35. 36 is provided. On the other hand, the hot water supply pipes 4 of the water heaters H1 and H2 are connected to various facilities to which hot water is supplied by a hot water main pipe 37. The water supply pipes 3 and outlet pipes 4 of the water heaters H1 and H2 are respectively provided with drain valves 38 and 39 for draining water from the water heaters H1 and H2. In addition, the closing origin valve which closes the hot water discharge pipe 4 is not provided in the downstream of the hot water amount adjusting valves 26a, 26b and the bypass water amount adjusting valves 28a, 28b of the water heaters H1, H2.
[0024]
The control units 7a and 7b of the two water heaters H1 and H2 are connected to each other by a communication cable 33, and each control unit 7a and 7b can transmit the operation state of the water heater to be controlled to the other water heater. And it is comprised so that reception of the driving | running state of the other water heater is possible.
The connected hot water supply system 1 is provided with a common remote controller 34 (hereinafter referred to as a remote controller) capable of operating the two control units 7a and 7b. The remote controller 34 operates the hot water heaters H1 and H2. Various signals can be output to the control units 7a and 7b. For example, when the set value of the hot water temperature is input from the remote controller 34 to the control unit 7a, the control unit 7a controls the hot water amount adjusting valve 26a and the bypass water amount adjusting valve 28a based on the detected value from the temperature sensor 27.
[0025]
When each control unit 7a, 7b receives a failure signal of the water heaters H1, H2 to be controlled as a predetermined signal set in advance, the hot water amount adjustment valves 26a, 26b of the water heaters H1, H2 to be controlled When both of the bypass water amount adjusting valves 28a and 28b are closed and a failure signal is input to the control units 7a and 7b of the two water heaters H1 and H2, the hot water amount adjusting valves of the water heaters H1 and H2 to be controlled 26a, 26b and bypass water amount adjusting valves 28a, 28b are both opened.
[0026]
Here, various states are assumed as failures of the water heaters H1 and H2. For example, if the burner 11 does not burn normally or cannot continue normal combustion due to an ignition failure due to a failure of the gas source valve 30 or an igniter failure, a temperature fuse operation, a failure of various sensors, etc. The abnormality is detected by predetermined failure diagnosis control, and the failure signals of the water heaters H1 and H2 are input to the control units 7a and 7b.
[0027]
Next, the operation of the connected hot water supply system 1 will be described.
As shown in FIG. 2, when the operation of the connected hot water supply system 1 is stopped, in each of the hot water heaters H1 and H2, the hot water amount adjustment valves 26a and 26b are closed to prevent condensation of the heat exchanger 10, while the bypass water amount The regulating valves 28a and 28b are opened. From this state, as shown in FIG. 3, when the operation of the connected hot water supply system 1 is started, only the hot water heater H1 is operated first, and the control unit 7a of the hot water heater H1 includes the hot water amount adjusting valve 26a and the bypass water amount adjusting valve 28a. By controlling, the amount of hot water flowing from the heat exchanger 10 to the hot water discharge pipe 4 and the amount of bypass water flowing through the bypass pipe 5 are adjusted so that the hot water temperature becomes the set temperature. At this time, the control unit 7b of the water heater H2 closes the bypass water amount adjustment valve 28b so that water does not flow out from the water heater H2 to the hot water main pipe 37.
[0028]
After that, when the amount of hot water used in the equipment downstream of the hot water main pipe 37 increases and a sufficient amount of hot water cannot be secured by the hot water heater H1 alone, the hot water is also discharged from the hot water heater H2. At this time, the control unit 7b of the water heater H2 also controls the hot water amount adjustment valve 26b and the bypass water amount adjustment valve 28b of the water heater H2 so that the temperature of the hot water from the water heater H2 becomes the set temperature.
[0029]
Here, in this connected hot water supply system 1, a closing source valve for closing the hot water discharge pipe 4 is provided on the downstream side of the hot water amount adjusting valves 26 a and 26 b and the bypass water amount adjusting valves 28 a and 28 b of each of the hot water heaters H 1 and H 2. It is not done. Therefore, as shown in FIG. 4, for example, when the hot water heater H1 fails during operation of the connected hot water system 1, water flows out from the failed hot water heater H1 to the hot water main 37, and the hot water temperature of the system is increased. In order to prevent the decrease, the control unit 7a closes both the hot water amount adjustment valve 26a and the bypass water amount adjustment valve 28a of the water heater H1 based on a failure signal generated by execution of predetermined failure diagnosis control.
[0030]
However, when both of the two water heaters H1 and H2 fail, the hot water amount adjusting valves 26a and 26b and the bypass water amount adjusting valves 28a and 28b are no longer closed, and water flows out to the hot water discharge pipe 4. There is no need to prevent this. On the other hand, if both the hot water amount adjustment valve 26 and the bypass water amount adjustment valve 28 are closed in each of the water heaters H1 and H2, the hot water heaters H1 and H2 are used when checking and repairing the failed water heaters H1 and H2. Even if the drain valves 38 and 39 are opened in order to drain the water, some of the water stays in the water heaters H1 and H2 and cannot be drained completely. Therefore, as shown in FIG. 5, when all the water heaters H1 and H2 have failed, the control units 7a and 7b of the water heaters H1 and H2 receive the same failure signal and the other control unit. Based on the failure signal to be performed, both the hot water amount adjusting valves 26a and 26b and the bypass water amount adjusting valves 28a and 28b of the water heaters H1 and H2 to be controlled are opened.
[0031]
That is, during the operation of the connected hot water supply system 1, the control valve opening / closing control as shown in FIG. 6 is executed by the control units 7a and 7b. Si (i = 10 to 13) indicates a step.
The adjustment valve opening / closing control by the control unit 7a of the water heater H1 will be described. As shown in FIG. 6, this control is started simultaneously with the start of the operation of the water heater H1, and the control hot water heater H1 breaks down. When a failure signal is input to 7a (S10: Yes), if the other water heater H2 has not failed (S11: No), both the hot water amount adjustment valve 26a and the bypass water amount adjustment valve 28a are closed. (S12). On the other hand, if the water heater H2 has also failed (S11: Yes), both the hot water adjustment valve 26a and the bypass water amount adjustment valve 28a are opened (S13), and the process returns. Similar control valve opening / closing control is executed in the control unit 7b of the water heater H2.
[0032]
Thereafter, when water is removed from the water heaters H1 and H2 for inspection and repair, the water supply valves 36 and 38 are opened after the water supply source valve 36 is closed as shown in FIG. Here, in each of the water heaters H1 and H2, since both the hot water amount adjusting valves 26a and 26b and the bypass water amount adjusting valves 28a and 28b are opened, the water in the water heaters H1 and H2 is completely drained. Can do.
[0033]
According to the connected hot water supply system 1 described above, the closing source valve for closing the hot water discharge pipe 4 can be omitted on the downstream side of the hot water amount adjusting valves 26a and 26b and the bypass water amount adjusting valves 28a and 28b. Is advantageous.
Even if the closing source valve is omitted in this manner, if any one of the two water heaters H1 and H2 fails, the hot water adjustment valves 26a and 26b are used in the failed water heater. Since both the bypass water amount adjusting valves 28a and 28b are closed, water does not flow out of the failed water heater and the temperature of the hot water in the system does not decrease. On the other hand, when both of the two water heaters H1 and H2 are out of order, the hot water amount adjusting valves 26a and 26b and the bypass water amount adjusting valves 28a and 28b are opened in each of the water heaters H1 and H2. The water in the vessels H1 and H2 can be completely drained.
[0034]
Next, modified embodiments in which various modifications are made to the embodiment will be described.
1] Even when the water heaters H1 and H2 are not actually broken down, for example, a command for igniting the burner 11 without supplying fuel gas is output from the remote controller 34 to the control units 7a and 7b, thereby deliberately supplying hot water. It is also possible to cause a failure state in the devices H1 and H2 so that a failure signal is input to the control units 7a and 7b.
2] When a signal for instructing draining of the water heaters H1 and H2 is output from the remote controller 34 to the control units 7a and 7b, and this signal is input to the control units 7a and 7b of the two water heaters H1 and H2. In addition, each control unit 7a, 7b may be configured to open both the hot water amount adjusting valves 26a, 26b and the bypass water amount adjusting valves 28a, 28b. By configuring in this way, for example, when the water heaters H1 and H2 are not used for a long time in winter when the water in the water heaters H1 and H2 may be frozen, the water heaters H1 and H2 are necessary as necessary. Can be drained.
[0035]
3] An operation unit for operating the control units 7a and 7b is provided in the water heater main body 2, and various commands such as the signal for draining are input to the control units 7a and 7b from the operation unit. It may be configured.
4] The number of hot water heaters constituting the connected hot water supply system is not limited to two, and the connected hot water system can be constituted by a plurality of three or more hot water heaters.
5] Provided with a control device for controlling the whole connected hot water system capable of mutual communication via radio or cable with the control unit of each hot water heater, and configured to operate each control unit from this control device May be. In this case, the control device can receive a failure signal from each water heater and transmit a failure signal of another water heater to each water heater. Further, when a signal for instructing draining is input to the control device, the signal can be transmitted to all the water heaters.
[0036]
【The invention's effect】
According to the invention of claim 1, each control means receives a failure signal indicating that one of the plurality of water heaters has failed and the water heater has failed to the control means of the failed water heater. when it is, along with to close both the hot water control valve and the bypass water amount adjusting valve failed water heater, when a fault signal is input to the control means of all of the water heater, all water heater hot water adjustment valve And the bypass water amount regulating valve are both opened, and the following effects are obtained.
[0037]
When one of the water heaters fails, a failure signal is input to the control unit of the failed water heater, and both the hot water adjustment valve and the bypass water amount adjustment valve are closed. The water does not flow out of the water heater and the system hot water temperature does not decrease. On the other hand, when all the water heaters have failed, both the hot water amount adjustment valve and the bypass adjustment valve are opened in each water heater, so that the water in the water heater can be completely drained.
[0038]
[0039]
According to the invention of claim 2 , by inputting a predetermined signal from the common remote controller to the control means of all the water heaters, both the hot water amount adjustment valve and the bypass adjustment valve of all the water heaters are opened. Water can be drained from the water heater. Other, similar effect to that of claim 1 is obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a water heater according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a connected hot water supply system (operation OFF state).
FIG. 3 is a schematic configuration diagram of a connected hot water supply system (single unit operation state).
FIG. 4 is a schematic configuration diagram of a connected hot water supply system (one unit failure state).
FIG. 5 is a schematic configuration diagram of a connected hot water supply system (two units in a failure state).
FIG. 6 is a flowchart of control valve opening / closing control at the time of a water heater failure.
FIG. 7 is a schematic configuration diagram of a conventional connected hot water supply system.
[Explanation of symbols]
H1, H2 Water heater 1 Linked hot water system 3 Water supply pipe 4 Hot water discharge pipe 5 Bypass pipes 7a, 7b Control unit 10 Heat exchangers 26a, 26b Hot water amount adjustment valves 28a, 28b Bypass water amount adjustment valve 34 Remote controller

Claims (2)

In a connected hot water supply system comprising a plurality of water heaters connected in parallel with a water supply pipe and a hot water pipe, a heat exchanger, and a bypass pipe that bypasses the heat exchanger and connects the water supply pipe and the hot water pipe,
Each water heater also serves as a hot water adjustment valve that adjusts the amount of hot water flowing from the heat exchanger to the outlet pipe, a bypass water amount adjustment valve that adjusts the amount of bypass water flowing through the bypass pipe, and a closing source valve that closes the outlet pipe and control means for controlling the hot water control valve and the bypass water amount adjustment valve as,
Each of the control means has a hot water supply that has failed when any one of a plurality of water heaters has failed and a failure signal indicating that the water heater has failed is input to the control means of the failed water heater. Both the hot water amount adjustment valve and the bypass water amount adjustment valve of the water heater are closed, and when a failure signal is input to the control means of all the water heaters, both the hot water amount adjustment valve and the bypass water amount adjustment valve of all the water heaters are turned on. A connected hot water supply system configured to open a valve. It said plurality of control means each have a common remote controller operable, connecting hot water supply system according to claim 1, characterized in that a remote controller that can output the predetermined signal.

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