JPH0439537A - Central hot water feeding device - Google Patents

Abstract

PURPOSE:To improve durability of one instant hot water boiler by a method wherein a central control means integrates each of the operating times of each of the instant hot water boilers, stores them, compares the integral stored values and selects and controls the instant hot water boilers preferentially operated in response to the stored values. CONSTITUTION:When a hot water feeding operation is to be carried out, a central control means 9 sends at first a command to an individual control means for an instant hot water boiler to be operated and then the remote operating valve is opened. The number of instant hot water boilers at this time is set in response to the hot water feeding load. The instant hot water boiler for sending an instruction is selected by a selection control means 11. That is, the central control means 9 integrates the operating time by an integration storing means 10 for every instant hot water boiler operated in response to the opening operation of the remote operation valve and stores it. The integral stored values in the integration storing means 10 are selectively compared by the selective control means 11 and the required number of values are selected in an order of small value.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a central water heater.

(Conventional technology) For example, in various large and medium-sized buildings such as hotels and general hospitals,
When supplying hot water to the omnipotent body, a central water heater is used. For example, as shown in FIG. 3, a conventional central hot water supply system has a large number of hot water supply points al, a2, . a3.・・・・・・
It consists of a circulation type piping d consisting of a hot water supply outgoing pipe and a hot water supply return pipe C passing through, a boiler e, a hot water storage tank f, a circulation pump g, etc. At least the boiler e and the hot water storage tank f are arranged in two sets in parallel so that they can be switched, with one side serving as a backup side, in order to prevent hot water supply from being interrupted even during periodic inspections or when a failure occurs. In addition, the hot water supply capacity of each unit has been designed with sufficient margin to ensure that there will be no shortage of capacity during use.

(Problems to be Solved by the Invention) Conventional central water heaters are heavy, take up a lot of space, and cannot be installed on the roof of a building, which is an empty space, due to the load and construction difficulties. It is often difficult to install on the first floor or basement, where space is at a premium. Also, even though it is designed with plenty of capacity,
It was not possible to respond to cases where a significant increase in capacity was required, such as for business expansion, and it was also difficult to increase capacity. Furthermore, such a configuration is not suitable for mass production, is expensive, and is relatively troublesome to transport and install. Furthermore, in two sets of boilers, the one that is not the backup side is normally used continuously, so there is a problem with the durability of one side.

The present invention aims to solve these problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the central hot water supply system of the present invention has a circulating piping system consisting of a hot water supply outgoing pipe and a hot water supply return pipe passing through a hot water supply point, and a plurality of instantaneous Consists of a water heater,
The plurality of instantaneous water heaters are configured in parallel by connecting each hot water output side to the hot water supply outgoing pipe and the water input side to the hot water supply return pipe, and from the water input side to the hot water output side. The water heating path is equipped with a flow rate sensor, water temperature sensor, and remote control valve.
Provided with individual control means for controlling the combustion of the burner and controlling the opening and closing of the remote control valve based on the sensor, and provided with a central control means for centrally managing each of the individual control means,
The central control means includes an integration storage means that integrates and stores the operating time of each instantaneous water heater corresponding to the opening operation of each remote control valve, and compares the integrated storage value of the integration storage means, A selection control means is provided for selecting and controlling an instantaneous water heater to be operated preferentially based on the value.

Further, in the above configuration, the individual control means is provided with a transmitting means for transmitting a signal corresponding to the combustion amount of the burner to the central control means, and the integrated storage means of the central control means is provided with a signal corresponding to the amount of combustion of the burner. Instead, an amount obtained by multiplying the operating time by a corresponding signal of the combustion amount may be integrated and stored.

Further, the selection by the selection control means described above may be performed when operating an instantaneous water heater in a stopped state, when stopping an instantaneous water heater in an operating state, or by a combination of these methods. You can also do this.

In the former case, the instantaneous water heater with a small value is selected and operated, and in the latter case, the instantaneous water heater with a large value is selected and stopped. Alternatively, the selection may be made every predetermined period of time.

(Function) When supplying hot water, the central control means sends a command to the individual control means corresponding to the instantaneous water heater to be operated, and opens the remote control valve. In the instantaneous water heater in which the remote control valve is opened in this way, water or return hot water branches from the hot water supply return pipe, flows into the water heating path from the water input side, and flows through this water heating path. The individual control means detects this flow using a flow rate sensor and starts combustion in the burner.

Therefore, the clean water or return hot water flowing through the water boiling path is heated through a heat exchanger heated by the combustion gas of the burner, and then flows into the hot water supply pipe from the hot water output side. The combined hot water flows through the hot water supply pipe and reaches the hot water supply point, where a portion of it is used. The remaining water flows back through the hot water supply return pipe, joins the supplied water at a suitable location, and is once again circulated through the hot water heating path of the instant water heater when the remote control valve is opened, as described above. In the above operation, the central control means uses the integration storage means to integrate and store the operating time of each instantaneous water heater that is operating in response to the opening operation of the remote control valve.

Therefore, by increasing or decreasing the number of instantaneous water heaters operated by opening the remote control valve as described above, the hot water supply capacity can be easily changed according to the hot water supply load. When increasing or decreasing the number of water heaters, the selection control means compares the integrated storage values stored in the integrated storage means, and selects the instantaneous water heater to be operated preferentially based on the value. That is, when increasing the number of instantaneous water heaters to be operated, the selection control means selects and operates the instantaneous water heaters with a small value, and when decreasing the number, the selection control means selects and operates the instantaneous water heaters with a large value. Select the water heater and stop it. Alternatively, the selection operation described above may be performed every predetermined period of time. Through such a selection operation, the operating times of the plurality of instantaneous water heaters are equalized, and instead of the operating time, an amount obtained by multiplying the operating time by a corresponding signal of the combustion amount of the burner is stored in the integrated storage means. If the integrated value is compared and an instantaneous water heater is selected by the selection control means as described above, the cumulative combustion amount of the multiple instantaneous water heaters will be equalized. be done.

If the required hot water supply capacity cannot be obtained even if all of the existing instantaneous water heaters are operated at the same time due to business expansion, etc., add an appropriate number of instantaneous water heaters to the existing equipment. If the hot water output side is connected to the hot water supply pipe and the water input side is connected to the hot water supply return pipe, the maximum hot water supply capacity can be easily increased.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of the central hot water supply system of the present invention. In this figure, the symbol 1 (l
a, lb, lc, . . .) are instantaneous water heaters, and although three are shown in the figure, the number of these instantaneous water heaters 1 can be set as appropriate. These instant water heaters 1
is equipped with a heat exchanger 2 and a burner 3 for heating it. In addition, a flow rate sensor 5, a hot water temperature sensor 6, and a remote control valve 7 are installed in the water boiling path 4 from the water input direction to the hot water output side 0, and a burner 3 based on the sensors 5 and 6 is installed.
An individual control means 8 is provided to control the combustion of the engine and to control the opening and closing of the remote control valve 7. Note that the remote control valve 7 can be configured with, for example, an electric valve. The combustion of the burner 3 by the individual control means 8 is controlled by detecting a flow of water exceeding a predetermined amount in the water boiling path 4 from the water input to the hot water output side using the flow rate sensor 5 described above. Along with the starting operation, feedback control is performed to control the water temperature on the downstream side of the heat exchanger 2 to a temperature preset in the individual control means 8 using the water temperature sensor 6, and in addition to the water temperature sensor 6, the water temperature on the downstream side of the heat exchanger 2 is Feedforward control performed by installing a water temperature sensor (not shown) that detects the return hot water or water temperature on the upstream side of the exchanger 2, or a combination of these controls, etc., is used in ordinary instantaneous water heaters for individual use. Any suitable control method can be applied. In addition, other components necessary for the actual operation of the instant water heater l, such as fan motor, spark plug, burner safety device such as flame rod, solenoid valve, proportional control valve, wind pressure switch, dry firing prevention switch, etc. Components are omitted from illustration.

Reference numeral 9 denotes a central control means that centrally controls each of the individual control means 8, and this central control means 9 includes control of each of the instantaneous water heaters 1 corresponding to the opening operation of each remote control valve 7. Integration storage means 10 that integrates and stores operating time;
A selection control means 11 is provided which compares the cumulative stored values of the cumulative storage means 10 and selects and controls the instantaneous water heater 1 to be operated preferentially based on the compared value.

Reference numeral 12 indicates a large number of hot water supply points 13a, 13b.

3c, ..., this circulation type piping 12 is composed of a hot water supply outgoing pipe 14 and a hot water supply return pipe 15. A circulation pump 16 is provided in the hot water return pipe 15.

Further, a water supply pipe 17 is connected to this hot water return pipe 15. The water supply pipe 17 is configured to be connected to the water supply via a valve 18 or an atmosphere release tank (not shown), or may be directly connected to the water supply via a check valve or the like depending on the case.

The instantaneous water heater I is constructed in such a way that the hot water output side 0 of each water heating path 4 is connected to the hot water supply outgoing pipe 14, and the water input side 1 is connected to the hot water supply return pipe 15 in parallel. These hot water output side O, hot water supply going pipe 14, water input side O and hot water supply return pipe 1
5 are connected via manual valves 19 and 20. In the illustrated configuration, reference numeral 21 represents a fuel gas supply pipe.

In the above configuration, when supplying hot water, the central control means 9:
First, a command is sent to the individual control means 8 of the instantaneous water heater 1 to be operated, and the remote control valve 7 is opened. The number of instantaneous water heaters 1 to which the opening command is sent is set in accordance with the hot water supply load, and the instantaneous water heaters 1 to which the command is sent are selected by the selection control means 11 as described later. In addition, the hot water supply load is
As will be described later, it can be detected, for example, by the temperature of the hot water flowing through the hot water supply IF 14.

The return hot water flowing through the hot water supply return pipe 15 by the circulation pump 16 joins with the clean water supplied from the water supply pipe 17 and flows downstream of the hot water supply return pipe 15. Then, when the remote control valve 7 is open, the hot water return pipe 1 of the water heater L is opened.
5 and flows into the water boiling path 4 from the water inlet 1. Since the flow rate sensor 5 detects the inflow of the returned hot water or tap water, the burner 3 starts combustion by the individual control means 8 and is controlled based on preset control conditions.

In this way, the return hot water or tap water that flows into the hot water boiling path 4 of the water heater 1 at the moment when the remote control valve 7 is opened is heated as it passes through the heat exchanger 2 and reaches the hot water output side 0, and the hot water goes into the hot water supply pipe. 14
to join. The combined hot water then flows through the hot water supply pipe 14 to each hot water supply point 13a, 13b, 13c, . . .
Some of them are used. The remainder flows back through the hot water supply return pipe 15, joins with the tap water supplied from the water supply pipe 17 according to the amount of hot water used, and flows downstream, and the above-mentioned circulation is performed again.

In the above operation, the central control means 9 integrates and stores the operating time of each instantaneous water heater 1 that is operating in response to the opening operation of the remote control valve 7, using the integration storage means 10. do. This operating time may be the elapsed time from the time when the command to open the remote control valve 7 is issued, or it may be the elapsed time from when the combustion start signal from the individual control means 8 is received and the elapsed time starts.

However, in the above operation, when the amount of hot water used increases, that is, the hot water supply load increases, the temperature of the hot water flowing through the hot water supply pipe 14 decreases, so the central control means 9 appropriately controls the decrease in the hot water temperature. If the water temperature is detected by the water temperature sensor (not shown), the number of instantaneous water heaters 1 to be operated is determined according to the degree of decrease in the water temperature, etc., and based on this number, the current An instantaneous water heater 1 whose operation is stopped with the remote control valve 7 closed is selected, and a command is sent to the individual control means 8 of the selected instantaneous water heater 1 to open the remote control valve 7. To select such instantaneous water heaters 1, the selection control means 11 compares the integrated storage values stored in the integrated storage means 10 through the operations described above, and selects the above-mentioned number in descending order of the values. Such integration storage means 1O and selection control means 11 can also be constructed using a microcomputer or the like. Therefore, the instantaneous water heater 1 whose remote control valve 7 is opened by the above command starts the same operation as described above, and operates at the same time as the instantaneous water heater 1 that was already in operation. This increases the hot water supply capacity of the system, making it possible to cope with the increase in load mentioned above.

Next, when the amount of hot water used decreases and the hot water supply load becomes smaller, the central control means 9 derives the number of instantaneous water heaters L whose combustion is to be stopped according to the degree of increase in the hot water temperature, etc. Based on the number, the selection control means 11 selects the instantaneous water heater 1 that is currently operating with the remote control valve 7 open, and sends a command to the individual control means 8 of the selected instantaneous water heater 1 to remotely control it. Valve 7 is closed. To select such instantaneous water heaters 1, the integrated storage values stored in the integrated storage means 1o are compared by the above-described operation, and the above-mentioned number of instantaneous water heaters are selected in descending order of the values. In this way, by reducing the number of instantaneous water heaters 1 in operation, it is possible to cope with a reduction in the hot water supply load.

By selecting the instantaneous water heater 1 by the selection control means 11 described above, the operating times of the plurality of instantaneous water heaters 1 can be equalized.

The above is merely intended to equalize the operating time of the instantaneous water heater 1, but in addition to this, the integration storage means 10 stores a signal corresponding to the combustion amount of the burner in place of the operating time. The multiplied amount is integrated and stored, and if these integrated values are compared and the selection control means 11 selects and controls the instantaneous water heater 1 as described above, the plurality of instantaneous water heaters 1 can be , their cumulative combustion amounts are equalized.

In this case, the individual control means 8 may be provided with transmitting means (not shown) for transmitting a signal corresponding to the combustion amount of the burner to the central control means 9. In addition, in the above explanation,
Selection and control by the selection control means 11 are performed both when operating the instantaneous water heater 1 in a stopped state and when stopping the instantaneous water heater 1 in an operating state, but only in one of them. I can do that too. Further, in addition to performing this selection each time the hot water supply load increases or decreases, it is also possible to perform this selection every time the hot water supply load increases or decreases, or every three days, for example.

In the above operations, if the required amount of hot water increases significantly due to business expansion, etc., and it cannot be handled even by operating all instantaneous water heaters, an appropriate number of other units can be installed in addition to the existing equipment. Additional instantaneous water heaters 1 are installed, their hot water output sides are connected to the hot water supply pipe 14, and their water inputs are connected to the hot water supply return pipe 15, and they are connected in parallel with the existing instantaneous water heater 1 and operated at the same time. If you let me,
The maximum hot water supply capacity can be easily increased.

Furthermore, if any of the instantaneous water heaters 1 breaks down during the above use, it is only necessary to repair or replace it, and as mentioned above, the hot water output side O of the instantaneous water heater 1, the hot water supply pipe 14 If the water supply method j and the hot water supply return pipe 15 are connected via the valve 19.20, this valve 19.
By closing 20, the operating status of other instantaneous water heaters 1,
That is, repair or replacement can be easily performed while hot water is being supplied.

(Effects of the Invention) As described above, the central water heater of the present invention is composed of a circulating pipe passing through a hot water supply point and a plurality of instantaneous water heaters, and the operation of the plurality of instantaneous water heaters is controlled. Since the structure is designed to respond to load fluctuations, the hot water storage tank required in conventional central water heaters is no longer required, and even if one of the multiple instantaneous water heaters breaks down, only that one can be repaired. Alternatively, all you need to do is replace it, and you can immediately respond to failures and prevent interruptions in hot water supply, so there is no need to install two sets that can be switched in advance, and it is also possible to expand your business. If the required amount of hot water supply increases significantly due to this, it is sufficient to add an appropriate number of other instantaneous water heaters to the existing equipment, so the design should be designed with sufficient water supply capacity in anticipation of the future. There's no need. Therefore, in the present invention,
The weight and required space can be significantly reduced, and installation is easy because multiple instantaneous water heaters can be transported as a unit, making it possible to install them on the roof of a building, which is an empty space. This has the effect of making it possible to effectively utilize the space on the first floor and basement that was occupied by conventional central water heaters. Furthermore, according to the present invention, each of a plurality of instantaneous water heaters can be mass-produced, which has the effect of significantly reducing costs compared to conventional equipment that is highly productive. .

Furthermore, the present invention has the effect that the hot water supply capacity can be easily adjusted by the central control means by opening and closing the remote control valve, and that fluctuations in load can be dealt with efficiently. In addition, with the present invention, it is possible to equalize the operating time or cumulative combustion amount of multiple instantaneous water heaters, so it is possible to prevent deterioration of durability due to intensive use of some parts, and to improve the durability of the entire device. It has the effect of improving sex.

[Brief explanation of drawings]

FIG. 1 is a system explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a system explanatory diagram of main parts. Further, FIG. 3 is a system explanatory diagram showing a conventional example. Code 1 (la, lb, lc,...)... Instantaneous water heater 1.2... Heat exchanger, 3... Burner, 4...
Water boiling route, 5...Flow rate sensor, 6...Water temperature sensor,
7...Remote control valve, 8...Individual control means, 9.
...Central control means, 10...Integration storage means, 11...
- Selection control means, 12... Circulation type piping, 13a, 13
b, 13c...Hot water supply point, 14...Hot water supply pipe, 1
5...Hot water return pipe, 16...Circulation pump, 17...
Water supply pipe, 18.19.20...Valve, 21...Fuel gas supply pipe, 0...Hot water output side, 1...Water input side.

Claims (5)

[Claims] (1) Consisting of a circulating piping system consisting of a hot water inlet pipe and a hot water return pipe passing through a hot water supply point, and a plurality of instantaneous water heaters, each of the plurality of instantaneous water heaters has a hot water output side connected to the hot water supply and return pipe. The water input side of the pipe is connected to the hot water supply return pipe to form a parallel structure, and the water heating path from the water input side to the hot water output side is provided with a flow rate sensor, a hot water temperature sensor, and a remote control valve. In addition to providing individual control means for controlling burner combustion and opening/closing of remote control valves based on sensors, a central control means for centrally managing each individual control means is provided. Comparing the cumulative storage value of the cumulative storage means with a cumulative storage means for cumulatively storing the operating time of each instantaneous water heater corresponding to the opening operation of the remote control valve;
A central water heater characterized by being provided with a selection control means for selecting and controlling an instantaneous water heater to be operated preferentially according to the value thereof. (2) The individual control means according to claim 1 is provided with a transmitting means for transmitting a signal corresponding to the combustion amount of the burner to the central control means, and the integrated storage means of the central control means is provided with the operation according to claim 1. A central water heater characterized in that instead of time, an amount obtained by multiplying the operating time by a corresponding signal of the combustion amount is integrated and stored. (3) A central water heater characterized in that the selection by the selection control means of claim 1 is performed when operating an instantaneous water heater in a stopped state, and the instantaneous water heater with a smaller value is selected and operated. (4) A central water heater characterized in that the selection by the selection control means of claim 1 is performed when stopping the instantaneous water heaters in operation, and the instantaneous water heater with a large value is selected and stopped. (5) A central water heater characterized in that the selection by the selection control means of claim 1 is performed every predetermined period of time.