JPH07332763A - Hot water/water switching type gas water heater - Google Patents

Abstract

PURPOSE:To provide a gas water heater in which the switching use of hot water/water can be not only simply conducted but also gas shut-off can be safely and effectively executed when switching to 'water' using. CONSTITUTION:The hot water/water switching type gas water heater comprises a heat exchanger 12 piped with a water supply tube 16 and a hot water output tube 18, a gas burner 14 for heating the exchanger 12, a water supply cock provided at the tube 16 or the tube 18, a hydraulic pressure interlocking valve 70 which is provided at the gas supply line of the burner 14 and opened by interlocking to the opening of the cock, and a gas safety valve 74 and an implement plug 76 provided at the supply line. When the water cock, the valve 70, the valve 74 and the plug 76 are opened and the burner 14 is switched from the hot water output state to a water output state by the operation of a hot water/water switching lever 56, the valve 74 and the plug 76 of the gas supply line are closed according to a command from a burner controller 124.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water / water switching type gas water heater, and more specifically, a gas supply valve provided in a gas supply system passage of a gas burner is safely closed when hot water is switched to hot water. The present invention relates to a hot and cold water switching type gas water heater having a gas safety mechanism that functions as described above.

[0002]

2. Description of the Related Art Conventionally, as a gas combustor of this type, as disclosed in, for example, Japanese Patent Laid-Open No. 4-198612,
The switch is turned on by the push button operation, the water flow path is opened by the drive of the motor (water flows through the heat exchanger), and in conjunction with this, the water pressure interlocking valve provided in the gas flow path of the gas burner is opened. Then, the motor is driven by the ON signal of the water flow detection switch, the magnet safety valve of the gas flow path is opened, and the instrument plug that is also installed in the gas flow path is also opened next (gas flows through the gas flow path of the gas burner). It is already known that the spark of the ignition electrode by the igniter ignites the gas burner and starts hot water heating of the water flowing through the heat exchanger.

In the case of a gas water heater having such a structure, if it is attempted to switch to tapping water during tapping, the tapping is usually stopped once by pressing an operation button (at this time, the water tap and the gas tap). Then, by turning the operation button or operating the hot water adjustment lever, which is provided separately, the faucet pilot valve of the faucet opens (at this time, the ignition operation of the gas burner is not performed), and only water is used. You can do it.

On the other hand, in order to stop the hot water supply and obtain water in this way, after the fire button is extinguished / stopped by the push button operation, the push button or hot water temperature adjusting lever is operated to the "water" position to supply the water. Opening the door is a means for solving the inconvenience of poor operability, and is disclosed in, for example, Japanese Patent Laid-Open No. 63-2737
The one disclosed in Japanese Patent No. 25 is also known.

The gas water heater disclosed in Japanese Patent Laid-Open No. 63-273725 closes the gas cutoff valve provided in the gas supply system passage of the gas burner when the abnormality detection sensor detects an abnormality in the ignition / water passing state. The gas supply to the burner is forcibly stopped in the event of an abnormality such as the disappearance of the water or water interruption. If you want to switch to tapping water in the hot water condition with this gas water heater, switch the hot water temperature control lever to the "stop water" position to close the gas shutoff valve and open the water supply valve to obtain the tapping water condition. It is what is done.

[0006]

However, the gas water heater disclosed in Japanese Unexamined Patent Publication No. 63-273725 only has a so-called one-seal structure gas shutoff valve in the gas supply system passage, and is When only used, the gas flow path of the gas burner is shut off by shutting off only the gas shutoff valve.

Therefore, if the gas cutoff valve causes valve closing failure due to rattling of the valve shaft or foreign matter caught in the valve seat, raw gas leaks from the gas burner when only water is used. It will be. Therefore, there is a problem in that there is a danger in use, such as the room being filled with raw gas, or the gas burner being ignited to cause gas explosion.

The present invention has been made to solve the above problems, and its purpose is to simply switch to the "water" position when switching to using only water during tapping. In addition to being sufficient, when switching to using only that water, the gas supply system path avoids the risk of leaking raw gas due to the so-called 2-seal structure gas shutoff of the magnet safety valve and instrument stopper, It is an object of the present invention to provide a gas water heater that further enhances the safety in using the device.

[0009]

To achieve this object, a gas water heater according to the present invention comprises a heat exchanger having a water supply pipe and a hot water discharge pipe, and a gas burner for heating the heat exchanger.
A hot and cold water switching means for switching from a hot water supply state to a hot water supply state, and a hot and cold water switching means, which is provided with a water tap provided in the water supply pipe or the hot water supply pipe and at least two gas supply valves provided in a gas supply system passage of the gas burner. And a valve closing means for closing the two supply gas valves of the gas supply system passage when the water supply state is switched to the water discharge state by a command from.

As a more specific embodiment, the gas water heater of the present invention has a heat exchanger in which a water supply pipe and a hot water discharge pipe are piped, a gas burner for heating the heat exchanger, and the water supply pipe or the hot water discharge pipe. , A water pressure interlocking valve that is opened in conjunction with the opening operation of the water tap provided in the gas supply system passage of the gas burner, and a gas safety valve and a device stopper that are also provided in this gas supply system passage. And a hot water switching means for switching the hot water supply state in which the water tap, the water pressure interlocking valve, the gas safety valve and the instrument plug are opened and the gas burner is ignited to the hot water state, and when the hot water switch means issues a hot water switching state. The gist of the present invention is to include a gas safety valve in the gas supply system passage and a valve closing means for closing the instrument plug.

[0011]

According to the gas water heater of the present invention having such a structure, the water tap is opened by the ignition operation of the gas burner, and the water flowing through the heat exchanger is heated by the heat of the gas burner to obtain tap water. , Provided in the gas supply system passage of the gas burner when this hot water discharge state is switched to the water discharge state 2
A flood condition is obtained because the three gas valves are closed and the faucet is open.

Therefore, even if one of the two gas supply valves fails to close, the raw gas will not be released if the other gas supply valve is closed. The risk of gas leakage will be reliably avoided.

Further, according to the second aspect of the present invention, when the water tap is opened by the ignition operation of the gas burner, the water pressure interlocking valve provided in the gas supply passage is interlocked with it, and the gas safety valve and Instrument plugs are opened one after another. Then, the water flowing through the heat exchanger is heated by the heat of the gas burner to obtain hot water, but when the hot water state is switched to the hot water state, the gas safety valve and the instrument plug provided in the gas burner gas supply system passage are closed. The water tap is open so that a water outflow condition can be obtained.

Also in this case, when only water is used, the gas is shut off by the two-seal structure in which the two valves, the gas safety valve and the instrument stopper, are closed. Therefore, there is a risk of release of raw gas when only water is used. Sex is definitely avoided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a schematic configuration of a gas water heater to which the present invention is applied. As shown,
The gas water heater 10 includes a heat exchanger 12 including a water supply pipe 16 and a hot water discharge pipe 18 in the main body of the appliance, and the heat exchanger 12
And a gas burner 14 for heating the. A water stop cock 20 is connected to the water supply pipe 16, and a gas supply plug 24 is connected to the source of the gas pipe 22 for supplying gas to the gas burner 14.

The water stop cock 20 is provided with a diaphragm chamber 28 in a water supply passage in the stopper, and a faucet diaphragm 26 is arranged so that a valve port 30 leading to the diaphragm chamber 28 can be opened and closed. It A valve opening 32 is provided at a central portion of the faucet diaphragm 26 corresponding to the valve opening 30, and the valve opening 32 is provided at the tip of a valve shaft 36 penetrating the stopper wall of the water stopcock 20. The attached faucet pilot valve 34 is always provided via a spring 38 in a state of being pressed and biased so as to close the valve port 32.

Further, the faucet diaphragm 26 is provided with a water passage hole 40 in addition to the valve port 32, and when the valve port 32 is closed by the faucet pilot valve 34, there is a relation of water pressure in the water supply passage. Water in the water supply channel enters the back side of the faucet diaphragm 26 through the water passage 40, and the closed state of the faucet pilot valve 34, that is, the closed state of the valve opening 30 of the diaphragm chamber 28 is maintained, The water stopcock 20 is configured to be kept in a water-stopped state.

Further, the diaphragm chamber 28 is partitioned by a hydraulic diaphragm 42 into a primary pressure chamber 44 and a secondary pressure chamber 46, and the hydraulic diaphragm 42 is located on the primary pressure chamber 44 side.
A water amount adjusting valve 48 for adjusting the amount of water flowing into the diaphragm chamber 28 from the valve port 30 is attached to the surface via a spring 50, and the water amount adjusting valve 48 adjusts the flow rate of water flowing through the water supply passage. It has become so.

The water that has flowed into the primary pressure chamber 44 is supplied to the water supply pipe 16 and the hot water supply pipe through the communication water passage 54 of the water amount throttle shaft 52 that is rotatably provided in the stopper wall of the water supply stopcock 20. 18 are distributed and supplied respectively to the water amount throttle shaft 5
By rotating 2, the flow rate of water supplied to the water supply pipe 16 and the mixing amount of water to the hot water flowing through the hot water discharge pipe 18 can be adjusted.

A water temperature adjusting lever 5 is attached to the water amount throttle shaft 52.
6 are connected, and a hot / cold water changeover switch 58 for detecting the rotation of the water amount throttle shaft 52 rotated by the operation of the hot water temperature adjusting lever 56 is provided in proximity. By rotating the hot water temperature adjusting lever 56, the water amount restricting shaft 52 is rotated to adjust the distribution amount of water distributed and supplied to the water supply pipe 16 and the hot water discharge pipe 18. By rotating 56 to the "water" position, the hot and cold water switch 58 is turned on, and the operation of the ignition switch (which will be described later in detail) for igniting the gas burner 14 is not accepted and the water of the water stopcock 20 is turned off. Stop pilot valve 34
It is configured such that only the water is opened and only the water is discharged from the hot water discharge pipe 18.

Further, the secondary pressure chamber 4 of the diaphragm chamber 28.
The 6 side is communicated with a venturi pipe portion 64 provided in the water supply pipe 16 through a bypass pipe line 62, and when water is flowing through the water supply pipe 16, the secondary pressure chamber 46 becomes a negative pressure from the primary pressure chamber 44. When the water flow control valve 48 moves to the left as shown by the arrow in FIG. 1, the automatic water pressure valve 70 provided in the gas flow path of the gas supply plug 24 is opened and at the same time the water flow detection switch 86 is turned on. (Details will be described later).

In FIG. 1, reference numeral 60 is a water quantity control valve for controlling the quantity of water sent to the water supply pipe 16 through the communication water passage 54 of the water quantity throttle shaft 52, and reference numeral 66 is a drainage provided in the secondary pressure chamber 46. Plugs, reference numeral 68, respectively represent strainers provided at the inlet of water to the water stopcock 20.

On the other hand, the feed gas plug 24 provided in the gas pipe 22 of the gas burner 14 has the above-mentioned water pressure for opening and closing the valve port 78 in the feed gas passage inside the plug in association with the movement of the water amount control valve 48. An automatic valve 70, a gas governor 72 that adjusts the opening degree of a valve opening 88 according to the gas pressure in the supply gas passage, and a valve opening 94 near the gas inlet of the supply gas plug 24 for preventing ignition troubles and the like. A magnet safety valve 74 provided in
An instrument plug 76 provided at the valve opening 97 for opening and closing the gas supply passage is provided.

The automatic hydraulic valve 70 has a valve shaft 82 connected to the hydraulic diaphragm 42 in the diaphragm chamber 28 by inserting the valve wall 82 of the gas supply plug 24 and the plug wall of the water stop cock 20 into the diaphragm. In the water-stopped state in which the water is not flowing through the water stopcock 20, the valve opening 78 is kept closed by the spring 80. A switch actuating piece 84 is provided in the middle of the valve shaft 82, and the water flow detection switch 86 which is turned on by the switch actuating piece 84 is provided beside the valve shaft 82, and the water stop cock is provided. Water flows to 20, and the water flow detection switch 86 is turned on by the switch operating piece 84.
The motor 99, which will be described later, is driven to start the ignition operation.

In addition, the opening of the valve opening 88 of the gas governor 72 is adjusted via a spring 90 which expands and contracts according to the gas pressure in the supply gas passage, and the magnet safety valve 74 is The valve opening 94 is held open by the operation of the built-in electromagnet. Further, the instrument plug 76 is attached to the tip of a valve shaft 98 that is inserted through the plug wall of the gas supply plug 24, and is normally pressed by a spring to close the valve port 97.

Thus, the motor 99, which is a drive source that is driven in conjunction with the ignition switch to open and close the water tap 20 to discharge or stop hot water, has first to third motor cam shafts linked to its drive shaft. Cams 100, 102, 1
04 is provided, and the first cam 100 is connected to a water stop cock opening / closing lever 108 for opening / closing the water cock pilot valve 34 via a motor interlocking lever 106.
The water stop cock opening / closing lever 108 is connected to the base of the valve shaft 36 of the water stop pilot valve 34, and the valve shaft 36 moves forward and backward by the operation of the water stop cock opening / closing lever 108.
Valve port 3 closed by the faucet pilot valve 34
2 is opened and closed.

The second cam 102 is connected to the valve shaft 98 of the instrument stopper 76, and the third cam 104 penetrates the stopper wall of the gas supply stopper 24 to magnetize the electromagnet contained in the magnet safety valve 74. It is connected to a safety valve operating rod 96 provided by being inserted. Then, the first cam switch 110 and the second cam switch 1 for detecting the rotational positions of the first cam 100 and the second cam 102 in the vicinity of the motor 99.
12 is provided, and the combination of ON / OFF signals from the first and second cam switches 110 and 112 opens the faucet pilot valve 34 of the water stopcock 20, and a magnet safety valve. The current of 74 is turned on to open the magnet safety valve 74, the appliance stopper 76 is also opened and the burner is ignited to start combustion, and all of the water stop cock 20, the magnet safety valve 74, and the appliance stopper 76. The fact that the hot water is closed and the hot water is stopped is detected.

The operation panel (not shown) of the instrument body is provided with an operation button 114 and an ignition switch 116 which is turned on by pressing the operation button 114, and the motor 99 is rotationally driven by turning on the ignition switch 116. It is like this. In FIG. 1, reference numeral 118 is an electrode for igniting the gas supplied to the gas burner 14, reference numeral 120 is a primary thermocouple for detecting the heat temperature in the vicinity of the gas barber 14, and reference numeral 122 is combustion in the heat exchanger 12. Each shows a secondary thermocouple installed in the peephole in the casing wall to detect the gas temperature. FIG. 2 is a block diagram showing a schematic configuration of a gas water heater 10 to which the present invention is further applied.

The configuration shown in FIG. 1 is denoted by the same reference numeral, and the detailed description thereof will be omitted, but as shown in the figure, the water stopcock 20 provided in the water supply pipe 16 and the gas supply system passage (gas. The magnet safety valve 74 and the instrument plug 76 provided in the pipe 22) are connected to the motor 99, respectively. The motor 99 and the hot / cold water changeover switch 58 are connected to the burner controller 124. An ignition switch 116 is connected to the burner controller 124,
Furthermore, the above-mentioned thermocouples 120 and 122 are also connected.

According to the gas water heater 10 thus constructed, the ignition switch 116 is now turned on by pressing the operation button 114, whereby the motor 9 is driven.
9 is turned on and driven by a predetermined angle. Then, interlocking with the rotation of the motor cam linked to the drive shaft of the motor 99, the water stop valve opening / closing lever 108 is pushed down, and the faucet valve spindle 36 is pushed down. As a result, the faucet pilot valve 34 is retracted, so that the diaphragm chamber 28
The valve port 30 leading to the water is opened and the water flows into the diaphragm chamber 28. Part of the water is sent to the water supply pipe 16 through the communication water passage 54 of the water amount throttle shaft 52, and the remaining water is sent to the hot water outlet pipe 18. To be

The water sent to the water supply pipe 16 passes through the Venturi pipe portion 64 to lower the pressure in the diaphragm secondary pressure chamber 46 of the diaphragm chamber 28, and the diaphragm 4
2 moves to the left in FIG. 1, and the hydraulic diaphragm 42
Through the water flow control valve 48 and the water pressure interlocking valve 7 of the gas supply plug 24.
Similarly, the valve shaft 82 that connects 0 and 0 is moved to the left in FIG. 1, and accordingly, the water pressure interlocking gas valve 70 in the gas supply plug 24 is moved.
The water flow detection switch 86 is turned on at the same time when is opened.

O from the water flow detection switch 86
The motor 99 is driven again by the N signal, and the third motor
The cam 104 pushes down the magnet safety valve actuation rod 96 to electrically connect the magnet safety valve 74 to open the magnet safety valve 74 by magnetizing the built-in electromagnet, and at the same time,
The cam 98 pushes the valve 98 of the instrument plug 76 open to open the instrument plug 76 as well, whereby the gas supply passage in the gas supply plug 24 is opened and gas is supplied to the gas burner 14. At the same time, ignition of an igniter (not shown) causes a continuous spark to fly to the ignition electrode 118, igniting the gas burner 14.

Therefore, the water supply pipe 1 leading to the heat exchanger 12
The water passing through 6 is heated by the gas burner 14 and the tap pipe 1
8 is discharged from the hot water, and at that time, the water directly sent to the hot water discharge pipe 18 through the communication water passage 54 of the water flow reduction shaft 52 is mixed, and the hot water continues to be adjusted to an appropriate temperature. Will be done. At this time, the motor cam is stopped at the combustion position.

The operation for switching to using only water while tapping hot water will now be described. Now, when the hot water temperature adjusting lever 56 is set to the "water" position during combustion of the gas burner 14, the hot water temperature adjusting lever 56 switches hot and cold water. Switch 58 is O
N, and this ON signal is sent to the burner controller 124. Then, the magnet safety valve 74 is de-energized by the command signal from the burner controller 124, the motor 99 is driven, the motor cam and the cam switch return the motor cam to the stop position, and the valve shaft 98 of the instrument plug 96 is returned. Both valves are sequentially closed to extinguish the gas burner 14. However, at this time, since the water stop cock opening / closing lever 108 keeps the water stop pilot valve 34 open, the water stop cock 20 is opened, and the hot water tap 1
Only water will be discharged from 8.

In this embodiment, the primary thermocouple 120 provided near the gas burner 14 and the secondary thermocouple 122 provided near the heat exchanger 12 are plus (+) and minus (-). Is connected in the opposite direction, and the electromotive force (V ₁ −V ₂ ) obtained by subtracting the electromotive force (V ₂ ) generated in the secondary thermocouple 122 from the electromotive force (V ₁ ) generated in the primary thermocouple 120 is It is sent as a signal to the burner controller 124.

In the burner controller 124, when the combined electromotive force (V ₁ -V ₂ ) of the primary thermocouple 120 and the secondary thermocouple 122 is lowered, the flame of the gas burner causes a lift phenomenon or the like to be extinguished. It is determined that the heat of combustion exhaust becomes high due to clogging of fins of the heat exchanger, resulting in incomplete combustion. A command signal is sent from the burner controller 124 to the motor 99, which drives the motor 99 to rotate to the original drive position and stop. At the stop position of the motor 99, both the magnet safety valve 74 and the instrument stopper 76 are closed, so that the risk of gas leakage when incomplete combustion or the like is avoided.

Although not directly related to the gist of the present invention, in order to stop the tapping during the tapping, the operation button 114 is pushed again to ignite the switch 116.
Is turned on, the current holding the magnet safety valve 74 released is turned off, and at the same time, the motor 99 is turned on and driven again, and the motor cam is returned to the stop position.
Then, at this time, the water stop cock opening / closing lever 108 also returns to the original state and the water cock pilot valve 34 is closed, and the instrument stopper 76 and the water cock pilot valve 34 are also closed to block the water supply passage and supply water. The gas flow path is also shut off and hot water is stopped.

When the water stop operation is performed in the above-described water discharge state, the hot water temperature control lever 56 is returned from the "water" position to the position in the low temperature / high temperature region range to open / close the water stop cock opening / closing lever 108. Is disengaged, and the faucet pilot valve 34 is closed by the spring force of the spring 38.
As a result, the water shutoff tap 20 is closed and water output is stopped.

Further, when only water is used from the water stop state that is not used, when the hot water temperature adjusting lever 56 is pinched with the fingertip and turned to the "water" position, the water shutoff tap opening / closing lever 1
08 rotates and the faucet pilot valve 34 is opened. At this time, the hot and cold water changeover switch 58 is turned on at the same time, and the ignition switch 116 is not accepted. Therefore, even if the operation button 114 is pressed at this time, the ignition switch 116 is not turned on, and the gas burner 14 is not ignited, so that water is obtained.

Finally, when it is desired to switch to hot water while using water, the hot water temperature adjusting lever 56 is returned from the "water" position to the low temperature / high temperature region position, and then the operation button 114 is pressed. Then, the discharge of water from the hot water outlet pipe 18 is once stopped by operating the hot water temperature adjusting lever 56, and then the hot water comes out of the hot water outlet pipe 18 by operating the operation button 114.

As described above with reference to the embodiments, according to the present invention, at the time of the ignition operation, the motor 99 is driven to open the faucet pilot valve 34 of the water stopcock 20 to allow water to flow and at the same time each valve of the gas stopcock 24. Open the gas burner 14
The hot water is switched to the "water" position by manual operation of the hot water temperature control lever 56 when the hot water is discharged by igniting and the hot water is desired to be switched to use only water during hot water discharge. By driving the motor 99 in accordance with a command from the controller 124, the magnet safety valve 74 and the instrument plug 76 in the gas supply system path are closed to cut off the gas flow path, and the water shutoff tap 20 remains open. Since only water is discharged from, it is possible to easily switch from hot water to hot water.

In that case, the gas supply passage of the gas burner 14 is in a so-called two-seal structure gas shut-off state in which the two gas shut-off valves of the magnet safety valve 74 and the instrument plug 76 are closed, so that one gas shut-off valve is Even if the valve closes unintentionally and the valve closes unintentionally due to rattling of the valve shaft or foreign matter getting caught in the valve seat, it is possible to avoid leakage of raw gas and ensure the safety of using the device. . Thus, it is needless to say that the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention.

[0043]

As is apparent from the above description, according to the gas water heater of the present invention, only hot water is used by simply switching the hot water switching means (for example, hot water switching lever) to the "water" position during tapping. It is easy to use because it can do the same, and the gas supply system line of the gas burner is 2 when switching to flooding.
Since it is blocked by the seal structure, there is no risk of gas leakage, and the safety in using the device is even higher.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas water heater as an embodiment to which the present invention is applied.

FIG. 2 is a schematic diagram showing a block diagram of the gas water heater shown in FIG.

[Explanation of symbols]

 10 Gas Water Heater 12 Heat Exchanger 14 Gas Burner 16 Water Supply Pipe 18 Hot Water Supply Pipe 20 Water Stopcock 24 Gas Stopper 56 Hot Water Temperature Control Lever 58 Hot Water Switch 70 Water Pressure Interlocking Valve 74 Magnet Safety Valve 76 Instrument Plug 99 Motor 124 Burner Controller

Claims (2)

[Claims] 1. A heat exchanger in which a water supply pipe and a hot water discharge pipe are piped, a gas burner for heating the heat exchanger, a water tap provided in the water supply pipe or the hot water discharge pipe, and a gas supply system passage of the gas burner. At least two gas supply valves provided, and further hot water switching means for switching from a hot water supply state to a water supply state, and two gas supply valves in the gas supply system path when the water supply state is switched by a command from the hot water supply switching means. A hot and cold water switching type gas water heater, which is provided with a valve closing means for closing. 2. A heat exchanger in which a water supply pipe and a hot water discharge pipe are piped, a gas burner for heating the heat exchanger, a water tap provided in the water supply pipe or the hot water discharge pipe, and a gas supply system passage of the gas burner. A water pressure interlocking valve that is opened in association with the opening operation of the water tap that is provided, and a gas safety valve and an instrument plug that are also provided in this gas supply system path are provided, and the water tap, the water pressure interlocking valve, the gas safety valve, and the instrument are further provided. A hot water switching means for switching the hot water state in which the plug is opened and the gas burner is ignited to the hot water state, and a closing valve for closing the gas safety valve and the instrument plug in the gas supply system channel when the hot water switching means switches to the hot water state A hot and cold water switching type gas water heater characterized by comprising: