JPH06281248A - Parallel type hot-water device - Google Patents

Abstract

PURPOSE:To make it possible to report whether the trouble of a hot-water apparatus is due to the abnormality of a fluid passage open/closure valve or due to the failure of a burner, etc., in the case that even when a feed water command is delivered to the hot-water apparatus to actuate it, it is not actuated, in a parallel type hot-water device wherein a plurality of hot-water apparatuses are parallely disposed. 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, K3 opens each fluid passage open/closure valve 17a, 17b, 17c, to put each of the apparatuses into a burning state. For example, even when a feed water command is delivered from the controller 20 to the apparatus K2 to open the valve 17b, and when the apparatus K2 is not actuated, whether or not water is fed to the apparatus K2 is checked, and if the water is not fed, an indication for reporting the abnormality of the valve 17b is displayed on a display device of a remote controller 21.

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 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 the parallel-type hot water supply device configured as described above, if the water flow command is output to the flow path opening / closing valve of the water heater to be burned, but the water is not passed to the water heater, the water heater is detected and the hot water heater is detected. It is characterized in that a signal for notifying the abnormality of the flow path opening / closing valve of the container is output.

[0008]

In the present invention, when the water flow command is issued to the hot water supply passage opening / closing valve but no water is passed through the hot water supply equipment, the abnormality of the flow passage opening / closing valve of the hot water supply equipment is notified. Since a signal is output, if the water heater does not burn even when a water flow command is issued to the water heater, depending on the presence / absence of a signal notifying the abnormality of the passage opening / closing valve, It is possible to know whether there is an abnormality or a burner side failure. Moreover, in the case of a failure of the flow rate on-off valve, it is possible to know which hot water supply apparatus has the failure of the flow rate control valve.

Therefore, the user can request repair at an appropriate repair destination according to the cause of the failure. Further, since the service person can know the cause of the failure and the flow path opening / closing valve having the failure, 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) between 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
If is not burning, it is checked by the can body side flow sensor 14 whether the can body side flow rate Qk flowing through the branch passage 5b is approximately 0 liter / min (S3), and the check signal is sent via the main body controller 19b. System controller 2
Sent to 0. When the can body side flow rate Qk of the branch passage 5b is approximately 0 liters / minute, it is determined that the flow passage opening / closing valve 19b is almost not opened due to a failure, and the flow passage opening / closing valve 19b is closed (S4). Reference numeral 20 indicates the flow control valve 1 of the water heater K2 on the display of the remote controller 21.
A display indicating that 7b is abnormal is displayed (S5).
If the water heater K2 does not burn and the can body side flow rate Qk of the branch passage 5b is not approximately 0 liter / min, the flow passage opening / closing valve 17b is closed (S6) and the operation of the water heater K2 is stopped.

In the above embodiment, the remote controller is made to display the abnormality of the flow passage opening / closing valve only when it is judged that the flow passage opening / closing valve is abnormal. When it is determined that the burner side is related to a gas appliance failure, a display indicating the burner side failure may be displayed on the remote controller. For example, in step S3 of the flowchart shown in FIG. 3, when the can body side flow rate Qk is not approximately 0 liters / minute, the can body side flow rate sensor 14 detects the flow path opening / closing valve 17b before closing (S6). It is checked whether the flow rate Qk being performed is equal to or higher than the minimum operating flow rate (MOQ) of the water heater K2, and if the flow rate is equal to or higher than the minimum operating flow rate (ie, the can body side flow rate Qk is equal to or higher than the minimum operating flow rate, Water heater K2
If the burner is not combusted], the remote controller 21 may be caused to display an indication that the burner has a failure.

[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 opening / closing valve is checked depending on the presence / absence of a signal indicating the abnormality of the flow passage opening / closing valve. It is possible to know whether or not there is a malfunction on the burner side, and in the case of a malfunction of the flow rate on-off valve, it is also possible to know which water heater has a malfunction in the flow rate control valve.

Therefore, the user can request repair to an appropriate request destination according to the cause of failure. Further, since the service person can also know the cause of the failure and the flow path opening / closing valve having the failure, it is possible to clearly narrow down the defective part or the failed portion at the time of the repair work, and the repair can be performed promptly and appropriately. 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. The water sent from the water heater is branched into each water heater during combustion, and the total amount of hot water boiled in each water heater can be used to burn the water. If water is not passed to the water heater even if a water flow command is output to the water heater's flow passage opening / closing valve, it is detected and a signal is output to notify the abnormality of the water heater's flow passage opening / closing valve. The parallel type hot water supply device.