JPH0783431A - Alarm system for erroneous piping between water input side and hot water output side of hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To an alarm system that facilitates prompt detection of erroneous piping of water input side and hot water output side of a hot water supplying apparatus. CONSTITUTION:A flow sensor 21 is turned ON, a burner is started after the sensor 21 detects a water input state, and an input water detected temperature to be detected by an input water temperature sensor 10 is compared with an output hot water detected temperature to be detected by an output hot water temperature sensor 11 by a comparator 25 in this state. When the detected input water temperature becomes, for example, higher than the desired output hot water temperature continuously for 3 seconds exceeding a predetermined allowable range previously applied to a memory 12, the comparator 25 outputs an error signal of the erroneous piping to an alarm instruction unit 26, which informs the erroneous piping by a buzzer 27 or a display, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous pipe detection and notification method for a water inlet side and a hot water outlet side of a water heater for supplying hot water to a desired place such as a kitchen or a bathroom.

[0002]

2. Description of the Related Art FIG. 5 shows a schematic structure of a generally known water heater. The operation of this type of water heater 1
It is controlled by the control device 6, and the control device 6 is a flow sensor provided in the water supply pipe 22 with the faucet 9 opened.
When the amount of supplied water equal to or more than the operation flow rate (for example, 3 liters / minute) is detected by 21, air is sent to the burner 4 by the rotation of the fan 2, the gas valve 20 is opened, and the fuel gas is supplied to the burner 4. The fuel gas is ignited. Then
After confirming the flame detection, the control device 6 controls the gas proportional valve 15 to send the burner 4 the fuel gas required to bring the supplied water amount to the set temperature. This fuel gas is burned to heat the heat exchanger 5, water passing through the heat exchanger 5 is turned into hot water, and a desired hot water of a kitchen or the like is supplied through a hot water connection pipe 23 connected to the outlet side of the heat exchanger 5. Hot water is supplied to the place.

When the water heater 1 is installed in a home or the like, it is installed at a predetermined position for piping work. At this time, the hot water supply connection pipe 23 is connected to the joint 16 on the outlet side of the heat exchanger 5. Then, the water supply connection pipe 29 is connected to the joint 17 on the inlet side of the heat exchanger 5. However, as shown in FIG. 4, the joint 16 on the outlet side of the heat exchanger 5 is connected to the water supply connecting pipe.
29 may be mistakenly connected, and the hot water outlet connection pipe 23 may be mistakenly connected to the joint 17 on the inlet side of the heat exchanger 5.

In this way, if the water pipe 9 of the water heater 1 that has been erroneously piped is opened, water flows from the outlet side of the heat exchanger 5 to the inlet side of the heat exchanger 5. Flow in reverse,
It flows out of the faucet 9 through the tap water connection pipe 23.

The water supply pipe 22 in the water heater 1 is provided with a flow sensor 21 in the middle thereof, and the flow sensor 21 is provided with a reverse rotation preventing mechanism (not shown). However, as described above, when water flows in the opposite direction to the conventional one, the reverse rotation prevention mechanism of the flow sensor 21 is not perfect, so the flow sensor 21 slowly rotates and the working flow rate (3 liters /
Min) or more low flow rate will be detected.

As described above, when the flow sensor 21 detects a low flow rate equal to or higher than the operating flow rate, the combustion operation is started. At this time, the gas proportional valve 15 is controlled to detect the low flow rate of the supplied water to a predetermined temperature. The fuel gas necessary for heating is sent to the burner 4, and this fuel gas burns to heat the feed water.

However, the flow rate flowing in the reverse direction to the water supply pipe 22 is
Operating flow rate detected by the flow sensor 21 (3 liters /
Much more than (minutes) (eg 16 liters / minute)
Is. With respect to this large flow rate, the supply amount of the fuel gas is supplied only in an amount commensurate with the operating flow rate, and only that much amount is burned, so naturally, the hot water that comes out is lukewarm water.

[0008]

By the way, although the control device has a self-check function, in the case of incorrect piping, as described above, the combustion operation is performed based on the flow rate detection signal from the flow sensor 21. The self-check function of the control device does not check the erroneous piping as a failure because it is performed and the operation is controlled normally in accordance with the detection signal. Therefore, the control device does not judge the incorrect piping as a failure and does not output the error signal. Therefore, the cause of the failure must be searched for in various ways, and it is extremely troublesome to detect the incorrect piping, and it takes a lot of time to find the incorrect piping failure.

The present invention has been made to solve the above problems, and an object thereof is to provide a water inlet side of a water heater that can easily and quickly detect erroneous piping on the water inlet side and hot water outlet side of the water heater. An object of the present invention is to provide an erroneous pipe detection notification method on the hot water side.

[0010]

In order to achieve the above object, the present invention is constructed as follows. That is, the erroneous pipe detection notification method of the water inlet side and the hot water outlet side of the water heater of the present invention is performed by burning the burner after the state of water entering the hot water heat exchanger is detected by the flow sensor, and detected by the water temperature sensor. In a water heater that controls the combustion amount of the burner in the direction of approaching the hot water temperature to the set temperature based on the information including the hot water temperature, the hot water temperature detected by the hot water temperature sensor, and the hot water amount detected by the flow sensor. , The water temperature detected by the water temperature sensor after the flow sensor detects the water temperature is compared with the hot water detection temperature detected by the hot water temperature sensor, and the hot water detection temperature exceeds the predetermined allowable range given in advance. Is higher than the hot water detection temperature, an error signal of incorrect piping is output to notify the incorrect piping.

[0011]

[Operation] After the water tap of the water heater is opened and the flow sensor detects the water entering state, the water entering temperature detected by the water entering temperature sensor is compared with the hot water detecting temperature detected by the hot water temperature sensor. When the incoming water detection temperature exceeds the given hot water detection temperature by exceeding the given allowable range,
An error signal for incorrect piping is output to notify of incorrect piping.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same names as those in the conventional example, and detailed description thereof will be omitted. In the water heater of this embodiment, after the water tap is opened and the water is detected by the flow sensor in the heat exchanger of the water heater, the burner is burned and the water temperature detected by the water temperature sensor is The present invention relates to a water heater for controlling the burner combustion amount in a direction to bring the hot water temperature closer to a set temperature based on the hot water temperature detected by the hot water temperature sensor and information such as the amount of incoming water detected by the flow sensor.

FIG. 1 shows a schematic view of a water heater according to this embodiment. FIG. 1 is a diagram showing a case where the water supply route and the hot water discharge route are erroneously connected when the water heater is installed.
Wrong where to connect, the water supply connection pipe 29 is connected to the outlet side 16 of the heat exchanger 5, and the tap water 9 of the tap water passage is provided to the tap water connection pipe 23 connected to the inlet side 17 of the heat exchanger 5. Has been. An inlet water temperature sensor 10 is provided on the inlet side of the heat exchanger 5, and a hot water temperature sensor 11 is provided on the outlet side 16 of the heat exchanger 5.
Is provided.

FIG. 2 shows a block diagram of the erroneous pipe detection portion of this embodiment. In the figure, the incoming water temperature sensor 10 detects the feed water temperature of the water flowing to the inlet side of the heat exchanger 5 shown in FIG. 1, and the hot water temperature sensor 11 indicates the hot water outgoing temperature of the hot water flowing to the outlet side 16 of the heat exchanger 5. It detects and outputs the detected temperature to the comparison unit 25. The flow sensor 21 detects the flow rate flowing in the pipe path of the water heater 1, and outputs the detection signal to the erroneous pipe determination command unit 24. The incorrect pipe determination command unit 24 receives the signal and outputs the incorrect pipe determination command to the comparison unit 25.

Further, a predetermined allowable range (for example, 5 ° C.) given in advance is stored in the memory 12, and the comparison unit 25 receives a command from the wrong pipe determination command unit 24 and the incoming water temperature sensor 10 is received. The hot water detection temperature detected by the hot water discharge temperature sensor 11 compares the hot water detection temperature detected by the hot water discharge temperature sensor 11, and the hot water detection temperature is within the allowable range (5
℃) and the time set in timer 13,
For example, when a temperature exceeding the allowable range is detected continuously for 3 seconds or more, the comparison unit 25 outputs an error signal of erroneous piping to the alarm command unit 26. The alarm command unit 26 receives the signal and notifies the erroneous piping by the display of the buzzer 27 or the display unit 28.

FIG. 3 shows a flow chart of the method for informing and detecting wrong pipes on the inlet side and the outlet side of the water heater of this embodiment. First, when the water tap 9 of the water heater 1 shown in FIG. 1 is opened, it is determined in step 101 whether or not the flow sensor 21 is turned on. When the ON signal is confirmed, the fan 2 rotates to send external air to the burner 4, and then
The gas valve 20 is opened to supply the fuel gas to the burner 4. On the other hand, in step 102, the control device determines whether or not the temperature sensors 10 and 11 are broken or short-circuited, and if normal, the fuel gas is ignited by the igniter electrode. Step 103
Then, it is judged whether or not flame is detected from the signal of the frame rod electrode, and after confirming the flame detection, in step 104, the water entering temperature detected by the water entering temperature sensor 10 and the hot water detecting detected by the hot water exiting temperature sensor 11 are detected. The temperature is compared, and when a value higher than the hot water discharge detection temperature is continuously detected for 3 seconds after the water entry detection temperature exceeds a predetermined allowable range (5 ° C. in the embodiment), an error signal of incorrect piping is given. Output to the alarm command unit 26. The alarm instructing unit 26 receives the signal and executes step 10
In step 5, use the buzzer or display to inform you of incorrect piping.

According to the present embodiment, after the flame is detected, the water temperature detected by the water temperature sensor 10 is compared with the water temperature detected by the hot water temperature sensor 11, and the water temperature exceeds the predetermined permissible range (5 ° C.) given in advance. When the detected temperature becomes higher than the hot water detection temperature for 3 seconds continuously, the error signal of the incorrect piping is output to notify the incorrect piping. Upon receiving the notification, the incorrect piping is immediately identified. Therefore, it is possible to quickly take measures against incorrect piping.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above-described embodiment, the temperature comparison start timing of the incoming water detection temperature and the hot water detection temperature is set after the burner flame is detected, but this temperature comparison start time is set when the rotation of the fan 2 or the gas valve 20 is opened. The temperature comparison of the incoming water detection temperature and the hot water detection temperature is not limited.

Further, in the above-described embodiment, the difference between the incoming water detection temperature and the outgoing hot water detection temperature is 5 ° C., but the difference between the two is not limited to 5 ° C.

[0020]

The present invention compares the incoming water detection temperature of the incoming water temperature sensor with the outgoing hot water detection temperature of the outgoing hot water temperature sensor after the flow sensor of the water heater detects the incoming water state, and determines the predetermined allowable range given in advance. When the detected water temperature exceeds and exceeds the hot water detection temperature, the error signal of the incorrect pipe is output to notify the incorrect pipe.As a result, the incorrect pipe can be identified immediately. It is possible to quickly take measures against incorrect piping.

[Brief description of drawings]

FIG. 1 is a schematic view of a water heater according to this embodiment.

FIG. 2 is a block diagram of an erroneous pipe detection notification portion on a water inlet side and a hot water outlet side of the water heater according to the present embodiment.

FIG. 3 is a flow chart of an erroneous pipe detection / informing system on a water inlet side and a hot water outlet side of the water heater according to the present embodiment.

FIG. 4 is an explanatory diagram showing erroneous piping states on a water inlet side and a hot water outlet side of a conventional water heater.

FIG. 5 is a schematic view of a conventional water heater.

[Explanation of symbols]

 1 Hot Water Heater 4 Burner 5 Heat Exchanger 9 Faucet 10 Inlet Water Temperature Sensor 11 Hot Water Temperature Sensor 21 Flow Sensor 22 Water Supply Pipe 23 Hot Water Connection Pipe 25 Comparison Section 26 Alarm Command Section 29 Water Supply Connection Pipe

Claims (1)

[Claims] 1. The burner is burned after the state of water entering the hot water supply heat exchanger is detected by the flow sensor, and the incoming water temperature detected by the incoming water temperature sensor and the outgoing hot water temperature detected by the outgoing hot water temperature sensor. , In the water heater that controls the burner combustion amount in the direction that the hot water outlet temperature approaches the set temperature based on the information including the water input amount detected by the flow sensor, it is detected by the water temperature sensor after the flow sensor detects the water input state. The detected water entry temperature is compared with the hot water detection temperature detected by the hot water temperature sensor, and when the water entry detection temperature exceeds the hot water detection temperature by exceeding the predetermined allowable range given in advance, the error of incorrect piping A method of informing and detecting an incorrect pipe on the water inlet side and the hot water outlet side of a water heater that outputs a signal to notify an incorrect pipe.