JPH0820110B2 - Parallel 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 parallel type hot water supply apparatus. 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 hot water supply device 51 provided with three hot water heaters K1, K2 and K3.
Three water heaters K are provided between the water inlet pipe 52 and the hot water outlet pipe 53.
Each branch path 54a, 54b, 54 provided with 1, K2, K3
c are connected in parallel, and the water heaters K1, K2, K3 are opened and closed by opening and closing the flow passage opening / closing valves 56a, 56b, 56c provided in the water heaters K1, K2, K3 in response to a command from the main body controller 55. The number of combustion units is switched, the water sent from the water inlet pipe 52 is branched and supplied to each hot water heater that is burning, and the total amount of hot water boiled by each hot water heater that is burning is discharged to the hot water discharge pipe 53. ing.

That is, normally, only the water heater K1 is operated with the flow channel opening / closing valve 56a of the main water heater K1 opened and the flow channel opening / closing valves 56b, 56c of the water heaters K2, K3 fully closed. There is. At this time, when the hot water supply capacity becomes insufficient even if the combustion power of the water heater K1 is maximized, the flow passage opening / closing valve 56b of the water heater K2 is opened, the water heater K2 is burned, and the entire water heater K2 is burned. Increase hot water supply capacity. further,
When the hot water supply capacity becomes insufficient even if the combustion power of the water heaters K1 and K2 is maximized, the flow path control valve 56c of the third water heater K3 is opened to open all the water heaters K1, K2, K3. To maximize the hot water supply capacity.

[0004]

In such a parallel type hot water supply apparatus, the hot water supply capacity of the hot water supply during operation is insufficient,
Even if the number of hot water heaters is increased, the water heaters that are about to start operation may not burn due to a failure of the hot water heaters. The cause of failure in this case is that the water heater does not burn because water does not flow to the branch due to an abnormality in the flow path opening / closing valve, and it does not burn due to a failure on the burner side such as the proportional control valve. is there. Of these, the abnormality of the flow path opening / closing valve is a malfunction around the water, and the malfunction on the burner side is a malfunction related to a gas appliance. Therefore, the business to which the repair is requested may be different.

However, in the conventional parallel type water heater, when the water heater to be operated does not burn due to a failure, the user may find that the passage opening / closing valve is abnormal,
There was a problem that it was not possible to determine whether the burner had a malfunction, and the repair requestee could not be identified. In addition, the service person did not know which cause of the failure until he disassembled the failed water heater, and also did not know which of the water heaters out of a plurality of water heaters had a failure. Therefore,
In the conventional parallel-type hot water supply device, it is difficult to repair when a failure occurs and it is difficult to properly deal with it.

The present invention has been made in view of the above-mentioned drawbacks of conventional examples, and an object of the present invention is, in a parallel type water heater, when a water heater does not burn due to a failure, the cause of the failure and the failure. By notifying the user or service person of the hot water supply that is in use, repairs can be performed quickly and appropriately.

[0007]

In the parallel type water heater of the present invention, two or more water heaters are arranged such that the water supply paths are in parallel, and the passage opening / closing valve provided in each water heater is opened / closed. By switching the number of fired water heaters, the water sent from the water source can be branched and supplied to each hot water heater, and the total amount of hot water boiled in each water heater can be used. in parallel water heating apparatus that, each water heater
Means to check the combustion of the water heater, and to each water heater
The flow rate sensor provided and the water heater
Even if a water flow command is output to the flow path opening / closing valve, combustion of the water heater concerned
Is not confirmed, and the flow sensor of the water heater is
If water flow through the water heater is not detected, the flow path of the water heater
Outputs a signal notifying that the on-off valve is abnormal; trying to burn
Even if a water flow command is output to the flow channel on / off valve of the water heater
No combustion of the water heater is confirmed, and the flow rate sensor of the water heater is
If the server detects water flow above the minimum operating flow rate,
Means for outputting a signal notifying the abnormality of the burner of the water heater
It is characterized by having a and.

[0008]

In the present invention, water is passed through the flow path opening / closing valve of the water heater.
If the water heater does not burn after issuing the command,
Notify the abnormality of the flow path opening / closing valve according to the detection value of the flow sensor
Output signal or burner abnormality signal
As a result, the water heater burns due to a failure of the water heater.
If this is not done, the signal will change the flow path on-off valve.
Notify you whether it is normal or burner abnormality
Can be. Moreover, let each water heater output a signal.
If there is an abnormality in the flow on / off valve, which hot water supply
If there is a malfunction in the flow on-off valve of
In that case, let us know which burner is out of order.
it can.

[0009] Therefore, in the user, the cause of failure is
Accordingly, the repair can be requested to an appropriate repair destination. Well
In addition, the service person is
Is obstructed, the flow control valve is defective, or the burner
To know if there is a possibility of malfunction or other causes
Therefore, the repair can be performed quickly and appropriately.

[0010]

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 main body controllers 19a, 19b, 19c use the set temperature Ts based on the value (fixed value) of the flow rate ratio Qk / Qb (flow distribution ratio) of the heat exchanger side and the bypass pipe 11 side (fixed value), etc.
A temporary set temperature Tgs higher than that (a value calculated so as to reach the set temperature Ts when mixed with water that has passed through the bypass pipe 11) is obtained, and hot water having the temporary set temperature Tgs is discharged from the heat exchanger 6. , The detection value Qk of the can body side flow sensor 14
And the feedforward control of the proportional control valve 9 according to the detected value Tc of the 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 power PK1, PK2, PK3 of 1, K2, K3 and a check signal indicating whether or not each water heater K1, K2, K3 is in a combustion state are sent, and each water heater K1, K2, K3 flow path opening / closing valves 17a, 17b,
The system controller 20 controls the opening and closing of the water heater 17c by opening and closing the flow passage opening and closing valves 17a, 17b and 17c according to the signals sent from the body controllers 19a, 19b and 19c. , K2, K3 are burned or stopped, and the number of operating water heaters is controlled. The set temperature Ts and the like can be input from the remote controller 21 connected to the system controller 20.

Further, each main body controller 19a, 19
Any method may be used to determine whether or not the water heaters K1, K2, K3 are in the combustion state by b, 19c, but the can body side flow rate Qk that is equal to or higher than the minimum operating flow rate (MOQ). Despite the presence, the hot water outlet temperature Th of the heat exchanger 6
Is equal to the incoming water temperature Tc, or when the flame is not detected by the flame rod 10, it can be determined that combustion is not occurring.

FIG. 3 is a system controller 2 for executing a failure diagnosis function when increasing the number of burners in the water heater.
It is a flow chart which shows an example of the processing procedure of 0. For example, the case where only the water heater K1 is burning and the hot water supply capacity is insufficient, and a water flow command is issued from the system controller 20 to the flow path opening / closing valve 17b of the water heater K2 will be described as an example along this flowchart. First, when the system controller 20 outputs a water flow command to the flow passage opening / closing valve 17b of the water heater K2 due to insufficient hot water supply capability of the water heater K1 (S1), whether the water heater K2 is really burning or not. It is checked by the main body controller 19b (S2),
The check signal is sent to the system controller 20. At this time, if the water heater K2 is burning, the parallel water heater 1 continues to operate normally. On the other hand, the water heater K2
Is not burning, the can body side flow rate sensor 14 causes the can body side flow rate Qk flowing through the branch passage 5b to be approximately 0 liter / liter.
It is checked whether or not it is a minute (S3), and the check signal is sent to the system controller 20 via the main body controller 19b. When the can body side flow rate Qk of the branch passage 5b is approximately 0 liters / minute, the flow path open / close valve 19
It is judged that b is almost open, and the flow path opening / closing valve 19b
After the closed (S4), the system controller 20 to the display indicating that the flow channel opening and closing valve 17b of the water heater K2 is abnormal on the display section of the remote controller 21
(S5) Stop the operation of the water heater K2.

Further , the water heater K2 does not burn, and
The flow rate Qk on the can body side at the crossroad 5b should be approximately 0 liter / min.
If (S2, S3), the can side flow sensor 14 detects
Flow rate Qk is less than minimum operating flow rate (MOQ) of water heater K2
Check if it is above (S6).
If the can body side flow rate Qk is higher than the minimum working flow rate,
Since the water heater K2 is not burning,
It was judged that the burner side had a gas appliance-related malfunction,
The system controller 20 is a remote controller 21.
Informs the display section that there is an abnormality in the burner of the water heater.
It is displayed (S7). After this, the flow path opening / closing valve 17b is turned on.
After closing (S8), the operation of the water heater K2 is stopped. Also, S
When the can body side flow rate Qk is less than the minimum working flow rate in 6
Immediately closes the flow path opening / closing valve 17b (S8) and the water heater K
Stop the operation of 2.

[0018]

According to the present invention, when a water flow command is issued to a water heater, but the water heater does not burn, the flow passage is checked depending on the presence / absence of a signal notifying the abnormality of the passage opening / closing valve or the burner. It is possible to know whether there is an abnormality in the on-off valve or the burner side.In addition, in the case of an abnormality in the flow on- off valve or burner , which water heater the flow on- off valve or burner may have failed. I can inform you.

Therefore, the user can request repair to an appropriate request destination according to the cause of failure. In addition, the service person also has a failure such as whether it is a flow path opening / closing valve or a burner.
Since it is possible to know the cause and in which water heater the failure has occurred, it is possible to clearly identify the defective part or the failure point during the repair work, and it is possible to quickly and appropriately perform the repair. . Therefore, the repair cost is also low.

[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 an example of an execution procedure of a failure diagnosis function in the above 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 7 Burner 14 Can body side flow rate sensor 17a, 17b, 17c Flow control valve 19a, 19b, 19c Main body controller 20 System controller

Claims (1)

[Claims] 1. A water source in which two or more water heaters are arranged so that their water supply paths are arranged in parallel, and the number of burners in the water heaters is switched by opening and closing a flow passage opening / closing valve provided in each water heater. In the parallel type hot water supply device in which the water sent from is branched and supplied to each hot water heater during combustion, and the total of the hot water boiled in each hot water heater can be used , A water flow command is issued to the means for confirming the combustion, the flow rate sensor provided for each water heater, and the passage opening / closing valve of the water heater to be burned.
Even if the power is applied, combustion of the water heater is not confirmed, and
The water heater flow sensor did not detect water flow through the water heater.
In some cases, a signal is sent to notify the abnormality of the flow path opening / closing valve of the water heater.
No. is output to the flow path opening / closing valve of the water heater that is about to burn.
Even if the water flow command is output, combustion of the water heater is confirmed.
And the flow sensor of the water heater is above the minimum operating flow rate.
If water flow is detected, check the burner of the water heater for abnormalities.
A parallel type hot water supply device comprising: means for outputting a signal to notify .