JPH0648262Y2 - Water heater - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a water heater capable of supplying general hot water to a kitchen or the like and hot and cold water to a bathtub.

[Conventional technology]

As a control device for an automatic water heater capable of supplying general hot water to a kitchen or the like and hot water to and from a bathtub, the conventional technique is, for example, as shown in the flowchart of FIG. In this case, if you press the hot water button provided on the bath remote controller etc. to instruct the start of hot water, first, the switching valve is turned to the position of the hot water and the switching valve is fully opened. Then, the fan motor is pre-purge rotated to perform pre-purge.After that, confirm that the fan is operating normally and there is no solenoid valve voltage, open the original solenoid valve, and at the same time open the proportional valve for slow ignition to eliminate pseudo flame. After confirmation, open the solenoid valve in the middle to supply gas to the gas burner, turn on the igniter, skip the spark, ignite the burner, and when normal ignition is confirmed, the combustion lamp lights up and the igniter is turned off for normal combustion. It shifts and starts to pour hot water into the bathtub.

In the above series of operations, if the water flow sensor does not turn on, if there is an abnormality in the fan speed, if there is a solenoid valve voltage, if there is a similar flame, or if flame is not detected, take the respective measures. The operation is performed again from A to A, that is, returning to the original pressing of the hot water button.

[Problems to be solved by the device]

In the above-mentioned conventional technology, since the combustion start sequence is operated after the switching operation of the switching valve is completed, for example, the time from the instruction at the time of hot water to the hot water system can be reduced. When measured, it took 5 seconds from pressing the hot water button to completion of switching the switching valve, 0.3 seconds from turning on the fan motor to checking normal fan rotation, and 0.05 seconds from checking normal fan rotation to opening the proportional valve. 1.75 seconds from confirmation of absence to turning ON of intermediate solenoid valve, intermediate solenoid valve ON
It takes 0.5 seconds from the start to burning the combustion lamp, for a total of 7.6
It took seconds. However, it takes a considerably long time of 7.6 seconds until the hot water starts after the hot water button such as the bath remote control is pressed to enter the hot water mode. There is a problem that cold water flows into the bathtub at the beginning of the hot water in order to perform the operation of the combustion start sequence after the switching operation is completed.

In view of the above problems of the above-mentioned conventional technology, the present invention provides hot water supply or hot water supply from a hot water supply or hot water supply start instruction by performing pre-purge by a fan without waiting for the water flow sensor to be turned on when the operation switch is operated. It is intended to provide a water heater in which the rise time to reach the hot water supply system is shortened to less than half that of the conventional technology and the inflow of cold water into the bathtub is reduced.

[Means for Solving the Problems]

In order to achieve the above object, the water heater of the present invention comprises a bath hot water supply passage and a general hot water supply passage provided by branching an outlet side hot water supply passage of a heat exchanger, heating means for burning and heating the heat exchanger, and A fan that blows combustion air to the heating means, a water flow sensor that detects the water flow of the hot water supply channel or the water supply channel, a switching valve that opens and closes the flow path of the bath hot water supply channel, and confirms the water flow by the water flow sensor. A water heater comprising a combustion control device for operating the heating means in a predetermined sequence, and an operation switch for instructing the hot water supply or hot water supply to the combustion control means by opening the switching valve by a predetermined operation. When the operation switch is operated,
Pre-purge control means is provided for performing the pre-purge operation by rotating the fan regardless of whether or not the water flow is detected by the water flow sensor.

[Action]

In the water heater according to the present invention configured as described above, the hot water supply switch or the hot water supply switch of the operation switch provided on the bath remote controller or the like is turned on when hot water supply or hot water supply to the bathtub is performed. When the start is instructed, the pre-purge control means is activated regardless of whether or not the water flow is detected by the water flow sensor, and the switching operation of the switching valve and the operation of the combustion start sequence of each functional part of the water heater simultaneously proceed in parallel to switch the combustion start. Since it precedes the completion, the start-up time from the instruction to start hot water supply or hot water supply to the hot water supply or hot water supply system is shortened.

〔Example〕

An embodiment of a water heater according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a water heater having a general hot water supply path for a kitchen or the like, a hot water supply path for a hot tub and an automatic hot water supply for a bathtub, and a hot-water supply path for hot water supplied by branching the hot water supply path on the outlet side of the heat exchanger. ,
A is a bathtub, to which the hot water supply pipe 1 from the hot water portion B is connected via a bus adapter 9 provided at the lower part of one side thereof,
Automatic hot water supply and high temperature hot water supply to the bathtub A are possible, and the hot water supply pipe 1 is provided with a branch pipe 2 equipped with a manual hot water supply tap V ₁ for general hot water supply to kitchens etc. I am trying. V is a switching valve that opens and closes the flow path of the bath hot water supply passage provided in the hot water supply pipe 1 to the bathtub A, and as shown in FIGS. 1 to 3, has connection ports 3a, 3b, 3c on three sides. A spherical valve 4 having an L-shaped passage 4a formed therein is rotatably provided in a casing 3 provided so that the forward / reverse motor 5 can rotate the spherical valve 4 at a constant angle in a predetermined direction. The structure is such that the route can be switched between the automatic hot water supply to the bathtub A and the high-temperature hot water supply, and the connection ports 3a, 3b at the crossing position of the casing 3 are provided.
Connect the upstream side 1a and the downstream side 1b of the hot water supply pipe 1 to the connection port
The connection port 3c at a position facing 3b has a downstream side of the hot water supply pipe 1
When a bypass pipe 6 connected by bypass to 1b is connected and a constant flow valve 7 made of an orifice is provided in the bypass pipe 6, when hot water is poured into the bath A, for example, the spherical valve 4 at the automatic hot water supply position is used. 90 with the forward / reverse motor 5 in the counterclockwise direction
The hot water from the upstream side 1a of the hot water supply pipe 1 is squeezed by the constant flow valve 7 of the bypass pipe 6 by rotating the L-shaped passage 4a to communicate with the connection ports 3a and 3c. By reducing the amount of hot water passing through, for example, it is not possible to obtain a high temperature hot water set at about 80 ° C (see Fig. 1), and during automatic hot water, the spherical valve 4 at the high temperature hot water position is set to normal. The reverse motor 5 rotates 90 degrees clockwise in the figure to connect the L-shaped passage 4a to the connection ports 3a and 3b to form an automatic hot water supply path, and the hot water from the upstream side 1a of the hot water supply pipe 1 is connected to the downstream side 1b. By passing the water as it is and increasing the amount of passing hot water from that at the time of high temperature hot water, for example, a hot water set at about 35 ° C to 50 ° C can be obtained (see Fig. 2). Further, when the general hot water is supplied, the spherical valve 4 is rotated by a certain angle in a direction (right angle direction) different from that of the automatic hot water supply and the high-temperature hot water supply, so that the connection ports 3b and 3c are connected to the spherical valve 4. Since it is closed and the route for automatic hot water supply and high temperature hot water is cut off (see Fig. 3),
The hot water from the hot water supply pipe 1 is branched by opening the hot water tap V _1.
It is designed so that hot water can be supplied via. Between the switching valve V of the hot water supply pipe 1 and the bath A, a vacuum breaker 8 for keeping the inside of the hot water supply pipe 1 at atmospheric pressure and a check valve V ₂ for preventing backflow are provided.

Reference numeral B denotes a hot water heating section, which connects the hot water supply pipe 2 to the outlet side of the heat exchanger 10 and the water supply pipe 11 to the inlet side so that the heat exchanger 10 is burned and heated by the heating means, that is, the gas burner 12. The water from the water supply pipe 11 is heated by the heat exchanger 10 to rise its temperature and flow out to the hot water supply pipe 2.
In addition, the gas burner 12 is divided into two parts so as to be used for slow ignition. In the figure, 13 is a water flow sensor for detecting the water flow in the water supply pipe 11 or the hot water supply passage, V ₃ is a proportional valve provided in the gas supply pipe 15 to the gas burner 12, and is a gas supply pipe on the upstream side of the proportional valve V _3. The main solenoid valve SV ₀ is provided at 15, and the gas supply pipe 15 is divided into two parts 15a and 15b on the downstream side, and intermediate solenoid valves SV ₁ and SV ₂ are provided respectively. Further, F is the gas burner 12
An air supply fan for forcibly supplying combustion air to a combustion chamber 14 in which is installed, 16 is an igniter, and 17 is a frame rod. Further, in FIG. 4, C is an electronic control unit,
Reference numeral 18 denotes a bath remote controller. An automatic hot water supply switch S ₁ and a high-temperature hot water switch S ₂ are provided as operating switches on an operation panel 18a of the bath remote controller 18, and the water flow sensor is turned on by turning on these switches S ₁ and S _2. When the operation switch is operated regardless of whether or not the water flow is detected by the air supply fan F
Is provided with a pre-purge control means for performing the pre-purge, and when the frequency signal from the water flow sensor 13 is output, the switching valve V, the original solenoid valve SV ₀ , the proportional valve V ₃ , the intermediate solenoid valves SV ₁ , SV
_2. Based on a program in which the functional units such as the igniter 16 are incorporated into the electronic control unit C, the switching operation of the switching valve V and the operation of the combustion start sequence of the respective functional units simultaneously proceed in parallel to start combustion. It is designed to precede the completion of switching.

The operation of the above-described structure in the case of high-temperature hot water will be described in detail with reference to the flowchart of FIG.

In step 101, first, when the high temperature hot water switch S ₂ of the bath remote controller 18 is pressed to turn it on, the electronic controller C is instructed to start the high temperature hot water, and the high temperature hot water mode lamp L ₁ of the bath remote controller 18 is made to blink. Next, at step 102, the forward / reverse motor 5 of the switching valve V is sent based on a command from the electronic control unit C.
Is started to rotate the spherical valve 4 to the high-temperature hot water pouring position, and at the same time, the motor M of the air supply fan F is also started to perform pre-purge rotation to perform pre-purge, and the spherical valve 4 is rotated to the high-temperature hot water pouring position. When the L-shaped passage 4a communicates with the connection ports 3a and 3c to form a high-temperature hot water path and hot water starts flowing in the path, the water flow sensor 13 detects this and turns ON, and the frequency signal is supplied to the electronic control unit C. After confirming the normal rotation of the air supply fan F and the absence of solenoid valve voltage in step 103, the proportional solenoid valve V ₃ becomes a slow ignition operation at the same time when the original solenoid valve SV ₀ is opened,
Proceed to 4 and pre-detect the presence or absence of flame depending on whether it is 0.1 μA or less and detect the absence of pseudo flame. One intermediate solenoid valve SV
_{When 1} is turned on and gas is supplied to one of the opened gas burners 12a, at the same time, the igniter 15 is turned on to skip continuous sparks and the motor M of the air supply fan F is ignited to the gas burner 12a as a slow ignition rotation. At the start of combustion in step 104, the opening degree of the spherical valve 4 of the switching valve V is wide enough to secure the amount of water determined by the constant flow valve 7 of the bypass pipe 6. After igniting one of the gas burners 12a, in step 105, the flame rod 17 detects flame and confirms normal ignition, and then in step 106
At this time, the combustion lamp L ₂ of the bath remote control 18 lights up, then the igniter 16 is turned off, and then the control of the proportional valve V ₃ is started, and at the same time, the other intermediate solenoid valve SV ₂ is turned on and opened, and the other gas burner is opened. Gas is supplied to 12b to ignite and end the slow ignition operation to enter the hot water system. After that, the spherical valve 4 of the switching valve V reaches the fully open position to complete the switching operation, and the hot water is sent to the bathtub A through the check valve V ₂ and the bus adapter 9.

In addition, in the above series of high-temperature hot water operation, step 10
If the water flow sensor does not turn on in step 2, if there is an abnormality in the fan speed in step 103, if there is a solenoid valve voltage, if there is a pseudo flame in step 104, or if no flame is detected in step 105 After taking step 101
Although it is not shown in the figure, it is the same as the conventional technique that the operation is returned to the pressing of the hot water button.

To stop the high-temperature hot water, when the high-temperature hot water switch S ₂ of the bath remote controller 18 is pressed again, the spherical valve 4 of the switching valve V is rotatably operated by the forward / reverse motor 5 in the same manner as in the general hot water supply. , The high temperature hot water passage is shut off and closed to stop the water flow, so there is no frequency signal from the water flow sensor 13
The functional parts such as SV ₀ are turned off and the gas burner 12 is extinguished.

Was measured the time to enter the water system pointing from the ON Press hot feed water switch S ₂ in the hot feed Yuji, water flow sensor 13 from the ON Press hot feed water switch S ₂ is ON It takes about 2.5 seconds to perform steps 101 and 102 from the confirmation of the rotation of the air supply fan F to the original solenoid valve S.
The time required for step 103 to turn on V ₀ is about 0.05 seconds, and step 10 from the preliminary detection of the pseudo flame to the lighting of the combustion lamp L ₂
The time required from 4 to 106 was about 0.5 seconds. So, it took about 3.05 seconds in total. Further, it is of course possible to implement the motor 5 even if the motor 5 only rotates forward.

Although the above-described embodiment is the operation in the case of high-temperature hot water, in the case of automatic hot water supply to the bathtub A, the switching operation of the switching valve V and the combustion start sequence are performed only by changing the switching position of the switching valve V. The operation is the same as the high-temperature hot water, so the description thereof is omitted. Further, in the case of general hot water supply, when the manual hot water tap V ₁ is opened, the frequency signal from the water flow sensor 13 is sent to the electronic control unit C.
When the hot water is supplied under the operation of the combustion start sequence such as pre-purge, slow ignition, flame detection, etc. and the hot water tap V ₁ is closed, the frequency signal of the water flow sensor 13 disappears and the original solenoid valve SV ₀
The functional parts such as are turned off to digest the gas burner 12, and after the post-purging, the air supply fan F is stopped.

[Effect of device]

As described above, the invention relates to whether or not the water flow is detected by the water flow sensor when the hot water supply switch or the hot water supply switch of the operation switch is turned on to instruct hot water supply or the hot water supply when hot water is supplied or supplied to the bathtub. Instead, the fan of the prepurge control means is rotated to perform prepurge, and the switching operation of the switching valve provided in the hot water supply pipe to the bathtub and the operation of the combustion start sequence of each functional part of the water heater are performed in parallel by the electronic control means. Since the structure is such that the combustion starts at the same time and the start of combustion precedes the completion of switching, the rise time from the instruction to start hot water supply or hot water supply to the hot water supply or hot water supply system can be significantly shortened, and cold water may flow into the bathtub. Less.

However, in the past, when hot water or hot water was supplied to the bathtub, it was necessary to have about 7.6 seconds or more from the instruction to start hot water or hot water to start hot water or hot water.
It has the convenience of being able to supply hot water or hot water in a state of 3.05 seconds, which is close to immediate hot water, and since the switching valve is fully opened after pre-purge etc., cold water rarely flows into the bathtub during hot water supply or hot water supply. It is not only effective in use, but also economically improved.

[Brief description of drawings]

FIG. 1 is a developed sectional view showing an embodiment of a water heater control device according to the present invention, and FIGS. 2 and 3 are sectional views of a switching valve,
FIG. 4 is a schematic diagram showing the relationship between the electronic control unit and the bath remote controller, FIG. 5 is a flow chart for hot water, and FIG. 6 is a conventional flow chart. A ... Bathtub, 1 ... Hot water supply pipe, V ... Switching valve, C ... Electronic control device, F ... Air supply fan, 18 ... Bath remote control, S ₁
...... Automatic hot water supply switch, S ₂ ...... High temperature hot water switch, 13 ...... Water flow sensor.

Claims (1)

[Scope of utility model registration request] 1. A bath hot water supply passage and a general hot water supply passage provided by branching an outlet-side hot water supply passage of a heat exchanger, heating means for burning and heating the heat exchanger, and combustion air for blowing to the heating means. A fan, a water flow sensor that detects the water flow in the hot water supply channel or the water supply channel, a switching valve that opens and closes the flow path of the bath hot water supply channel, and confirms the water flow by the water flow sensor and moves the heating means in a predetermined sequence. In a water heater provided with a combustion control device to be operated and an operation switch for opening the switching valve and instructing the combustion control means to perform hot water supply or hot water supply by a predetermined operation, when the operation switch is operated, A water heater comprising a pre-purge control means for performing the pre-purge operation by rotating the fan regardless of whether or not the water flow is detected by the water flow sensor.