JPH06281250A - Parallel type hot-water device - Google Patents

Abstract

PURPOSE:To make it possible to effect necessary feed capacity of hot water even when either one of sub-hot water apparatuses for increasing the number of apparatuses has been impaired, in a parallel type hot-water device wherein a plurality of hot-water apparatuses are parallelly arranged. CONSTITUTION:Hot-water apparatuses K1, K2, K3 are respectively provided in branched pipes 5a, 5b, 5c which are branched parallelly between a water inlet pipe 2 and a hot-water delivery pipe 3. On receipt of a feed water command from a system controller 20, each of the apparatuses K1, K2, Kc opens each fluid passage open/closure valve 17a, 17b, 17c to put each of the apparatuses into a burning state. For example, in the case that, during the time while the apparatus K1 only is operating, if the capacity thereof becomes insufficient and even if a water feed command is delivered to the apparatus K2 from a system controller 20 to open the fluid passage open/closure valve 17b and still the apparatus K2 is not actuated, the fluid passage open/closure valve 17b of the apparatus K2 is closed and the fluid passage open/closure valve 17c of the apparatus K3 is opened to actuate the apparatus K3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel type hot water supply device. More specifically, the present invention relates to a parallel hot water supply device having a large hot water supply capacity by arranging a plurality of hot water heaters in parallel.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view showing a conventional parallel type water heater 51 having three or more water heaters. Between the water inlet pipe 52 and the hot water outlet pipe 53, each branch passage 54a, 54b, 5 provided with a main water heater K1 and two sub water heaters K2, K3.
4c are connected in parallel, and the number of operating sub water heaters K2, K3 is switched by opening / closing the flow path opening / closing valves 56b, 56c provided in each sub water heater K2, K3 in response to a command from the main body controller 55. The water sent from the water inlet pipe 52 is branched and supplied to each hot water heater in operation, and the sum of the hot water boiled in each hot water heater in operation is discharged to the hot water discharge pipe 53.

That is, normally, the main water heater K is opened with the flow passage opening / closing valve 56a of the main water heater K1 opened and the flow passage opening / closing valves 56b, 56c of the sub water heaters K2, K3 fully closed.
Driving only one. At this time, when the hot water supply capacity becomes insufficient even if the combustion power of the main water heater K1 is maximized, the flow passage opening / closing valve 56b of the sub water heater K2 is opened,
The sub water heater K2 is burned to increase the hot water supply capacity as a whole. Furthermore, when the hot water supply capacity becomes insufficient even if the combustion power of the main water heater K1 and the sub water heater K2 is maximized, the flow path control valve 56c of the sub water heater K3 is used.
Open and burn all the water heaters K1, K2, K3 to maximize the hot water supply capacity.

[0004]

However, in the conventional parallel type water heater 51, the sub water heaters K2 and K2 are provided.
Since the operation start sequence of No. 3 was fixed, inconvenience might occur. That is, when the hot water supply capacity of the main water heater K1 becomes insufficient, if the sub water heater K2 does not burn even if the flow passage opening / closing valve 56b of the sub water heater K2 is opened, only the main water heater K1 is supplied with water. There is a problem that hot water with a low temperature is discharged, or in the worst case, the hot water is not discharged, because there is no choice but to operate in a state of insufficient capacity.

The present invention has been made in view of the drawbacks of the above conventional examples, and an object of the present invention is to ensure that even if a failure occurs in any of the sub water heaters, the hot water supply capacity is not insufficient. Thus, it is an object of the present invention to provide a parallel type hot water supply device capable of outputting a required hot water supply capacity.

[0006]

In the parallel type water heater of the present invention, the main water heater and two or more sub water heaters are arranged such that the water supply paths are in parallel and the number of operating sub water heaters is switched. By supplying the water sent from the water source to each water heater in operation in a branched manner, the total amount of hot water boiled in each water heater can be used in parallel. In the type hot water supply device, when the sub water heater to be operated has not started to operate, another sub water heater that is not in operation is operated.

[0007]

According to the present invention, in a parallel water heater having two or more sub water heaters, if one of the sub water heaters does not start due to a failure, another sub water heater is provided. By operating them, it is possible to operate the required number of water heaters and to output a sufficient hot water supply capability even if a failure occurs in the sub water heater.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic overall view of a parallel type water heater according to an embodiment of the present invention. In this parallel type hot water supply device 1, three branch pipes 5a, 5 are provided between a water inlet pipe 2 whose pipe end is connected to city water or the like and a hot water outlet pipe 3 provided with a calan 4 at the pipe end.
b, 5c are connected in parallel, and each branch pipe 5a, 5
Water heaters K1, K2, K3 are provided in the middle of b and 5c.

FIG. 2 shows each of these water heaters K1, K2, K3.
It is a schematic block diagram which shows the structure of. That is, each branch pipe 5
The heat exchanger 6 is provided in the middle of a, 5b, 5c,
The heat exchanger 6 is heated by the burner 7, and the combustion power of the burner 7 is controlled by the proportional control valve 9 provided in the gas passage 8. A frame rod 10 for detecting the flame of the burner 7 is provided near the burner 7. A bypass pipe 11 is provided in each of the branch pipes 5a, 5b, 5c so as to bypass the heat exchanger 6 between the heat exchanger inlet side and the heat exchanger outlet side. The bypass pipe 11 is provided with a bypass flow rate control valve 12 and a bypass flow rate sensor 13 for detecting the bypass side flow rate Qb. Between the branch points of the branch pipes 5a, 5b, 5c with the bypass pipe 11 and between the heat exchanger inlet side, the can body side flow sensor 14 for detecting the can body side flow rate Qk, and the incoming water temperature for detecting the incoming water temperature Tc. A sensor 15 is provided to detect the temperature Th of hot water discharged from the heat exchanger 6 between the heat exchanger outlet sides of the branch pipes 5a, 5b and 5c and the confluence with the bypass pipe 11. A sensor 16 and flow passage opening / closing valves 17a, 17b, 17c are provided, and a mixing temperature sensor 18 is provided downstream of the confluence of the branch pipes 5a, 5b, 5c with the bypass pipe 11.

The water heaters K1, K2, K3 are main body controllers 19a, 1 each equipped with a microcomputer.
Built-in 9b, 19c, bypass flow sensor 1
3, the detection signals of the can body side flow rate sensor 14, the incoming water temperature sensor 15, the hot water temperature sensor 16, the mixing temperature sensor 18 and the flame confirmation signal of the frame rod 10 are input to the respective main body controllers 19a, 19b, 19c. The controllers 19a, 19b, 19c control the proportional control valve 9 and the bypass flow rate control valve 12 of each of the water heaters K1, K2, K3 in accordance with these detected values to control the temperature of hot water discharged to the hot water discharge pipe 3. .

There are various methods for controlling the hot water discharged to the hot water discharge pipe 3, for example, the following feed forward control (FF control) and feedback control (F
(B control). In this method, when the set temperature Ts is set by the remote controller 21,
The body controllers 19a, 19b, 19c are heat exchangers 6
From the value (fixed value) of the ratio Qk / Qb (flow distribution ratio) of the flow rate between the side of the bypass pipe 11 and the side of the bypass pipe 11 and the set temperature Ts.
A temporary set temperature Tgs higher than s (value calculated so as to reach the set temperature Ts when mixed with water that has passed through the bypass pipe 11) is obtained from the heat exchanger 6
Detection value Q of the can side flow sensor 14 so that
The proportional control valve 9 is feedforward-controlled according to k and the detected value Tc of the incoming water temperature sensor 15. Further, the main body controllers 19a, 19b, 19c monitor the mixing temperature Tm between the hot water discharged from the heat exchanger 6 and the water that has passed through the bypass pipe 11 by the mixing temperature sensor 18, and check the mixing temperature Tm and the set temperature Ts. Deviation of (Tm
The bypass flow rate control valve 12 is operated according to −Ts), and the bypass flow rate Qb is feedback-controlled so that the hot water of the set temperature Ts is discharged to the hot water discharge pipe 3.

Further, these main body controllers 19a,
19b and 19c are under the control of the system controller 20. That is, each main body controller 19a, 19b,
Each water heater K from 19c to the system controller 20
A signal indicating the combustion powers PK1, PK2, PK3 of 1, K2, K3 and a check signal indicating whether each water heater K1, K2, K3 is in the operating state or in the stopped state are sent, and Channel opening / closing valve 1 for each water heater K1, K2, K3
7a, 17b, 17c are controlled to be opened / closed by a system controller 20, and the system controller 20 receives the signals sent from the main body controllers 19a, 19b, 19c from the respective passage opening / closing valves 17a, 17b, 17c.
By opening and closing c, each water heater K1, K2, K3 is operated or stopped, and the number of operating water heaters is controlled. Further, from the remote controller 21 connected to the system controller 20, the set temperature T
s etc. can be input.

Each body controller 19a, 19b, 19
c indicates whether the water heaters K1, K2, K3 are in the operating state or in the stopped state (especially, the system controller 20 outputs a water flow command to open the flow path opening / closing valves 17a, 17b, 17c). The method for determining whether or not the vehicle has stopped regardless of whether or not it is present is not particularly limited, and any method may be used. For example, if you divide it roughly,
Branch passage 5 due to failure of passage opening / closing valves 17a, 17b, 17c
It is considered that water does not flow to a, 5b, 5c and that the water flowing in the branch paths 5a, 5b, 5c is not heated due to a failure of the burner 7 or the like. Of these, the flow path opening / closing valve 17a,
17b and 17c are flow path opening / closing valves 17a, 17b and 17c.
If the detection value of the can body side flow rate sensor 14 remains 0 even though is opened by the system controller 20, it can be determined that there is a failure. In addition, the minimum operating flow rate (M
If the hot water outlet temperature Th of the heat exchanger 6 is equal to the incoming water temperature Tc, or if the flame is not detected by the frame rod 10, despite the presence of a can body side flow rate Qk equal to or higher than OQ), the burner 7 or the like fails. Can be determined.

FIG. 3 is a flowchart showing a processing procedure of the system controller 20 when the number of hot water heaters is increased (not included when it is decreased). Hereinafter, description will be given along this flowchart. First, in a normal state, the flow path opening / closing valve 17a of the water heater K1 is opened,
The water heaters K2 and K3 are in a standby state with the flow path opening / closing valves 17b and 17c closed. When the Karan 4 is opened and water is passed through, the water heater K1 is burned and put into an operating state. The combustion force PK1 of the water heater K1 during this operation is monitored by the system controller 20 through the main body controller 19a, and the combustion force PK1 of the water heater K1 is the maximum combustion force P thereof.
A value slightly smaller than MX αPMX (α≈1 and α <1;
For example, when α = 0.9) is exceeded (S1), the water flow command from the system controller 20 opens the flow passage opening / closing valve 17b of the water heater K2 (S2), and the water heater K2 is burned. Then, the main body controller 19b checks whether or not the water heater K2 has started operating and is burning (S3), and a check signal is sent to the system controller 20. If the water heater K2 is in operation,
Hot water is supplied by operating the two water heaters K1 and K2. At this time, the combustion power PK2 of the water heater K2 is monitored through the main body controller 19b, and the combustion power PK of the water heater K2 is monitored.
2 is a value αPMX that is slightly smaller than the maximum combustion power PMX
(S4), the flow path opening / closing valve 17c of the water heater K3 is opened (S5), and the water heater K3 is burned. Also in this case, the main body controller 19c checks whether or not the water heater K3 has started operation (S6), and sends a check signal to the system controller 20. If the water heater K3 has started operation, the maximum number of water heaters Supply hot water.

On the other hand, the passage opening / closing valve 17 of the water heater K2
Even if a water flow command was issued from the system controller 20 to open b, the water heater K2 did not start operation (S2, S
3) In the case, the system controller 20 uses the water heater K2.
The flow passage opening / closing valve 17b is closed, a water flow command is issued to the water heater K3, and the flow passage opening / closing valve 17c is opened (S7).
To burn. When the check signal that the water heater K3 has started to operate is received, the water heater K3 is operated instead of the water heater K2 that should be operated originally, and the water heaters K1 and K1.
Hot water is supplied by 2 units of 3.

Further, even if the flow path opening / closing valve 17b of the water heater K2 is opened, the water heater K2 does not start its operation, and the water heater K3
When the water heater K3 does not start due to an abnormality even when the flow path opening / closing valve 17c of No. 3 is opened (S7, S8), the water heater K3
The flow path opening / closing valve 17c is closed (S9) and only the water heater K1 is operated to supply hot water.

Similarly, when the water heaters K1 and K2 are operating, the combustion force PK2 of the water heater K2 becomes close to the maximum combustion force PMX, and a water flow command is issued from the system controller 20 to cause the flow of the water heater K3. When the water heater K3 does not start due to an abnormality even when the road opening / closing valve 17c is opened (S
Also in 5 and S6), the flow path opening / closing valve 17c of the water heater K3 is closed (S9), and only the water heaters K1 and K2 are operated to supply hot water.

In the above embodiment, the combustion power of the hot water heater during operation is monitored to increase the operating number of hot water heaters. However, the operating number of hot water heaters can be switched according to the water flow rate. It is also possible to do so. Also, when the combustion power of the water heater is used as a reference, in addition to the method of increasing the number of water heaters before reaching the maximum combustion amount as in the above embodiment, after the maximum combustion amount is exceeded and the capacity becomes insufficient, The number of water heaters may be increased.

[0019]

According to the present invention, when one of the two or more sub water heaters does not start due to a failure, it is necessary to operate another sub water heater. It is possible to achieve good hot water supply ability. Therefore, even if a failure occurs in the sub water heater, it is possible to eliminate the drawback that hot water having a temperature lower than the set temperature is discharged, or in the worst case, it is not discharged.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram showing a parallel type water heater according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing one hot water supply device in the above parallel type hot water supply device.

FIG. 3 is a flowchart showing a control procedure at the time of switching the number of system controllers in the parallel type hot water supply device.

FIG. 4 is an overall schematic configuration diagram showing an array type hot water supply device according to a conventional example.

[Explanation of symbols]

 2 Water inlet pipe 3 Hot water outlet pipe 5a, 5b, 5c Branch pipe K1, K2, K3 Water heater 17a, 17b, 17c Flow passage opening / closing valve 19a, 19b, 19c Main body controller 20 System controller

Claims (1)

[Claims] 1. Water sent from a water source by arranging a main water heater and two or more sub water heaters with their water supply paths arranged in parallel and enabling the number of operating sub water heaters to be switched. In the parallel water heater, the sub-water heaters to be operated can be used by branching and supplying the hot water to each hot water heater in operation. The parallel type hot water supply device is characterized in that, when the operation is not started, another sub water heater that is not in operation is operated.