JP3862846B2 - Main stop type gas water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-removable gas water heater provided with a valve opening device that pushes and opens a magnet type safety valve by water pressure.
[0002]
[Prior art]
In general, gas appliances incorporate a magnet-type safety valve that closes the fuel gas flow path when the combustion flame disappears during combustion.
The magnet type safety valve is held open by energizing with dry cell power when the combustion flame is detected by the flame guard or thermocouple's thermoelectromotive force. The force is released and the valve closes.
In addition, since the magnet type safety valve cannot be opened by itself, it is pressed against the suction surface by the pushing force at the time of ignition to set the valve opening, and becomes openable by releasing the pushing force.
As the pushing force for setting such a magnet type safety valve to open, there are known those using water pressure in addition to those by human power or other electromagnetic force.
[0003]
The main stop type gas water heater using this water pressure is disclosed by the present applicant in Japanese Utility Model Laid-Open No. 4-1789, and as an example, the opening of a magnet safety valve incorporated in the main stop type gas water heater is disclosed. The apparatus will be described with reference to FIG.
For the stop-type gas water heater, see the embodiment of the present application in FIG.
[0004]
In this stop-type gas water heater, a water pressure responsive device 1 that operates by differential pressure due to water flow is provided, and a valve opening device 34 is provided at the tip of a spindle 37 that transmits the operation of the water pressure responsive device 1.
This valve opening device 34 is slidably mounted on the spindle 37 so as to be opposed to the magnet type safety valve 33, and is engaged with and integrated with the spindle 37 until the magnet type safety valve 33 is opened and sucked. After moving and opening the magnet-type safety valve 33, the engagement with the spindle 37 is released, and the magnet-type safety valve 33 slides back on the spindle 37 to a position where the magnet-type safety valve 33 can be closed.
When the water flow is stopped, the spindle 37 is returned to the initial stop position by the water pressure responsive device 1, and the valve opening device 34 and the spindle 37 are returned to engagement (hereinafter referred to as reset).
[0005]
The function of the valve opening device 34 is to release the pressing force when the magnet safety valve 33 is pushed and opened to the adsorption position, and to retreat to a position that does not prevent the magnet safety valve 33 from closing (press release).
Therefore, in order to restore the pressing ability in preparation for the next ignition operation, it is necessary to engage the spindle 37 and the valve opening device 34, that is, reset.
The reset position is close to the stop position where the spindle 37 is returned.
[0006]
[Problems to be solved by the invention]
By the way, when the ignition operation is performed after a long time after the fire extinguishing operation, the gas in the gas flow path may be replaced with air, so that ignition may not be performed by one ignition operation. In such a case, the user presses the operation button 17 to perform a fire extinguishing operation, and then performs an ignition operation again. However, depending on the timing, there is a problem that an ignition error may occur.
This is because if the ignition operation is performed immediately after the fire extinguishing operation, the spindle 37 moves forward without the spindle 37 returning to the stop position, and the valve opening device 34 and the spindle 37 cannot be returned to the engaged state. This is because the device 34 cannot push and open the magnetic safety valve 33.
Therefore, the main stop type gas water heater of the present invention solves the above-described problem, and even if the ignition operation is performed immediately after the fire extinguishing operation, the magnet-type safety valve can be surely pushed open and held by suction. For the purpose.
[0007]
[Means for Solving the Problems]
The main-stop gas water heater according to claim 1 of the present invention for solving the above-described problems is
A heat exchanger that heats water in the water through the combustion heat of the burner;
A magnet-type safety valve provided in the gas flow path to the burner and held open by electromagnetic force;
A faucet provided in a water supply path to the heat exchanger, for opening and closing the water supply path;
A water pressure responsive device that is provided in the middle of a water supply path from the faucet to the heat exchanger, and generates a differential pressure between the primary chamber and the secondary chamber divided by a diaphragm by passing water to the heat exchanger;
A spindle that moves back and forth due to the differential pressure by the water pressure actuator,
A valve opening device provided at the tip of the spindle and opening the magnet type safety valve;
An engagement mechanism for releasing the engagement state between the spindle and the valve opening device after the magnet safety valve has been opened, and re-engaging the spindle and the valve opening device in the middle of retreat of the spindle due to the stoppage of water flow; In the non-removable gas water heater with
A communication path communicating the primary chamber and the secondary chamber of the water pressure actuator;
The gist of the invention is to provide an on-off valve that closes the communication passage when the water pressure in the primary chamber reaches a predetermined water pressure and opens the communication passage when the water pressure in the primary chamber becomes less than the predetermined water pressure.
[0008]
According to the first stop type gas water heater of the present invention having the above-described configuration, when the water flow is started and the water pressure in the primary chamber reaches a predetermined water pressure, the on-off valve closes the communication path.
The water pressure responsive device generates a differential pressure between the primary chamber and the secondary chamber, advances the spindle, opens the magnet-type safety valve, and starts combustion.
After that, when the water flow is stopped and the water pressure in the primary chamber of the water pressure actuator decreases, the on-off valve opens the communication path that connects the primary chamber and the secondary chamber, and the pressure difference between the primary chamber and the secondary chamber disappears. Retreats.
Accordingly, water is moved from the primary chamber to the secondary chamber via this communication path, the spindle is retracted quickly, and re-engagement between the spindle and the valve opening device is accelerated.
As a result, even if the ignition operation is performed immediately after the fire-extinguishing operation, the magnet-type safety valve can be reliably pushed and opened to be attracted and held.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the main-stop gas water heater of the present invention will be described based on the schematic diagram of FIG.
In the water supply path from the water inlet, a faucet 19 that opens and closes the flow path by manual operation with the operation button 17 is provided, and the water pressure responsive device 1 is provided downstream thereof. The water pressure responsive device 1 is provided with a diaphragm 15 that is movable back and forth, and a primary chamber 13 and a secondary chamber 12 are formed by being partitioned by the diaphragm 15.
In addition, a water governor 16 that is coaxial with the diaphragm 15 and maintains the flow rate even when the feed water pressure fluctuates is provided on the entrance to the primary chamber 13 of the water pressure actuator 1.
In addition, a hot water temperature adjusting unit 18 is provided in a flow path continuing from the primary chamber 13 (downward in the drawing).
In the hot water temperature adjustment unit 18, the flow path is branched into a heating path 28 that leads to the heat exchanger 23 via the venturi 22 and then reaches the mixing unit 21, and a bypass path 20 that directly leads to the mixing unit 21.
And the branched flow path merges at the mixing part 21 and reaches the outlet.
The venturi 22 provided in the heating path 28 narrows the flow path and is provided with a lateral hole 22a in a direction perpendicular to the flow path. And the conduction path 24 which leads to the secondary chamber 12 of the hydraulic pressure response apparatus 1 from this horizontal hole 22a is provided.
[0010]
Further, the hydraulic pressure responding device 1 is provided with a communication path 6 that leads from the primary chamber 13 to the secondary chamber 12. In the middle of the communication path 6, an opening / closing unit 2 that includes a valve 7 that opens and closes the communication path 6 is provided. Provided.
The opening / closing part 2 is partitioned by a pressure-sensitive diaphragm 8 that is movable up and down, and an air chamber 9 a that is open to the atmosphere on the upper side and a pressure receiving chamber 9 b that communicates with the primary chamber 13 of the water pressure actuator 1 are provided on the lower side.
The atmospheric chamber 9a is provided with a spring 10 that urges the pressure sensitive diaphragm 8 toward the pressure receiving chamber 9b.
In the center of the bottom of the pressure receiving chamber 9b, a hole portion 11 that communicates with the secondary chamber 12 of the water pressure actuator 1 is provided.
Further, the valve 7 for opening and closing the hole 11 is fixed coaxially to the pressure-sensitive diaphragm 8, and the hole 11 is closed as the pressure-sensitive diaphragm 8 moves toward the atmosphere chamber 9a, so that the pressure-receiving diaphragm 9 moves toward the pressure-receiving chamber 9b. It is provided so that the hole part 11 may be opened with the movement of.
[0011]
As shown in FIG. 5, the spindle 37 is provided on the same axis as the water-side shaft 14 that transmits the moving force from the hydraulic response device 1, and is urged by the return spring 32 in the downstream direction (right direction in the figure).
When the moving force overcomes the force of the return spring 32, the spindle 37 is advanced in the left direction in the figure, and the magnet safety valve 33, the valve opening device 34, and the water pressure automatic valve 4 described later are operated.
[0012]
The magnet type safety valve 33 is provided in the valve chamber 35 on the upstream side of the gas flow path. A valve body 43 urged in the closing direction by a spring 45 is provided at one end of the valve shaft 36 so as to be able to contact and separate from the seat portion 38 of the main body. An adsorption piece 46 is provided at the other end of the valve shaft 36 so as to face the adsorption surface 47 of the electromagnet.
[0013]
Downstream of the magnet safety valve 33, a valve opening device 34 is disposed on the same axis so as to face the magnet safety valve 33, and is coaxially inserted into the tip of a spindle 37 that conveys the movement of the hydraulic response device 1.
The valve opening device 34 moves together with the spindle 37 until the magnet-type safety valve 33 is opened and sucked, and after the magnet-type safety valve 33 is fully opened, the spindle 37 moves forward with the spindle 37. And the magnetic safety valve 33 slides back on the spindle 37 to a position where it can be closed. When the water flow is stopped, the valve opening device 34 and the spindle 37 are engaged and returned when the spindle 37 is returned to the initial stop position by the water pressure responsive device 1.
[0014]
A water pressure automatic valve 4 slidably inserted into the spindle 37 is provided downstream of the valve opening device 34, and is urged to close in the downstream direction by a valve spring 39, and is brought into contact with and separated from the seat portion 40 of the main body. Thus, the second valve chamber 41 is formed in the section with the valve body.
The spindle 37 is provided with a push member 42 for opening the automatic water pressure valve 4. After the opening of the magnet type safety valve 33 is completed, after the engagement between the spindle 37 and the valve opening device 34 is released, the hydraulic automatic valve 4 is pushed by the pushing member 42 of the spindle 37 and opened.
[0015]
Further, the burner 27 is provided with an electrode (not shown) for igniting a gas by discharge and a frame guard (not shown) for detecting a combustion flame.
The push button 17 that performs the ignition / extinguishing operation is provided with an operation switch 30 that is turned on at the time of the ignition operation and maintains the ON state until the next fire extinguishing operation.
In addition, a water pressure switch 49 is provided in the vicinity of the spindle 37 for detecting a position due to the movement of the spindle 37 and detecting a water passing or water stopping state.
Then, a controller 29 is provided for detecting the operation of each switch, discharging to the electrodes, detecting the combustion flame by the frame guard, holding the magnet-type safety valve 33 open, etc. by dry cell power.
Further, an instrument plug 25 that opens and closes a gas supply path to the burner 27 by a push button 17 is provided upstream of the gas flow path.
[0016]
Next, each operation will be described with reference to FIGS.
When the ignition operation is performed by the operation button 17, the operation switch 30 is turned on by the movement of the operation button 17, and the instrument plug 25 and the water tap 19 are mechanically opened.
Then, water passage is started by opening the faucet 19, and water flows into the primary chamber 13 of the water pressure actuator 1 (FIG. 2).
The pressure receiving chamber 9 b has the same pressure as the water pressure in the primary chamber 13, and the pressure sensitive diaphragm 8 overcomes the force of the spring 10 by this water pressure and moves upward together with the valve 7 to close the communication path 6.
On the other hand, when the water flow from the primary chamber 13 passes through the venturi 22, the pressure in the secondary chamber 12 of the water pressure actuator 1 decreases according to the decrease in the water pressure in the lateral hole 22a due to the venturi effect.
For this reason, a differential pressure is generated between the primary chamber 13 and the secondary chamber 12 of the water pressure responsive device 1, and a force in the left direction of the drawing is generated in the diaphragm 15 which can be displaced back and forth.
This force is transmitted to the water-side shaft 14 of the water pressure responsive device 1, and the spindle 37 overcomes the force of the return spring 32 and moves together with the water-side shaft 14 to the left in the drawing (hereinafter referred to as "advance"). .
[0017]
The valve opening device 34 starts to push the valve shaft 36 of the magnetic safety valve 7 from the stop position (state A (FIG. 5)) by the advancement of the spindle 37, and starts the valve body 43 to open.
Further, the spindle 37 pushes the attracting piece 46 of the magnet type safety valve 33 to the attracting surface 47 of the electromagnet (state B (FIG. 6)).
At this time, the water pressure switch 49 is turned on immediately before the attracting piece 46 comes into contact with the attracting surface 47 of the electromagnet, the dry battery power is supplied from the controller 29 to the magnet safety valve 33, and the open state of the magnet safety valve 33 is Kept.
[0018]
Further, when the spindle 37 moves forward, the force causes the valve opening device 34 and the spindle 37 to be disengaged, and the valve opening device 34 moves backward on the spindle 37 while sliding to the right side of the drawing to move to the magnet type safety valve 33. Is released (state C (FIG. 7)).
The release of the pushing force is due to the disengagement of the engagement position between the ball 51 and the recess 52 formed in the spindle 37.
Further, when the spindle 37 moves forward, the state D is reached (FIG. 8), and the hydraulic automatic valve 4 is pushed and opened by the pushing member 42 integrated with the spindle 37, and the fuel gas begins to flow into the burner 27.
[0019]
When the operation button 17 performs a fire extinguishing operation, the operation button 17 returns to the front, the operation switch 30 is turned off, the energization from the controller 29 to the magnet safety valve 33 is stopped, and the magnet safety valve 33 is closed.
In addition, the instrument plug 25 and the faucet 19 interlocked with the operation button 17 are closed, and the gas supply path and the water supply path are closed.
By stopping the water, the pressure difference between the primary chamber 13 and the secondary chamber 12 of the diaphragm 15 is eliminated, and the water flows into the secondary chamber 12 while pushing out the water in the primary chamber 13 by the return spring 32 force. Then, the spindle 37 starts moving to the stop position (right direction in the figure).
At this time, as shown in FIG. 3, the opening / closing section 2 opens the valve 7 by the force of the spring 10 and fully opens the communication path 6 between the primary chamber 13 and the secondary chamber 12 of the hydraulic pressure actuating device 1.
For this reason, the outflow of water from the primary chamber 13 and the inflow to the secondary chamber 12 are performed quickly, and the spindle 37 quickly moves back to the stop position.
Then, the pressing member 42 integrated with the spindle 37 moves backward to close the hydraulic automatic valve 4, and the valve opening device 34 and the spindle 37 are re-engaged (state E (FIG. 9)).
Therefore, the valve opening device 34 can quickly recover the pushing ability by the opening / closing part 2 described above and can prepare for the next ignition.
[0020]
Since the conventional water pressure responsive device 1 does not include the opening / closing part 2, it is only a flow path for extruding water from the primary chamber 13 to the hot water temperature adjusting unit 18 and flowing into the secondary chamber 12 from the conduction path 24 ( FIG. 10). Therefore, it takes time for the diaphragm 15 to move back to the stop position.
In addition, since the conduction path 24 is thin and long, the resistance to water flow is large, and in addition, when the hot water temperature adjusting unit 18 is set to a high temperature, the opening area of the hot water temperature adjusting unit 18 is small, and is even larger. Due to water resistance, the diaphragm 15 could not move back quickly.
[0021]
The graph shown in FIG. 4 is a comparative measurement of the retreat time of the spindle 37 depending on the presence / absence of the opening / closing part 2.
H1 and C1 in the figure indicate the conventional retreat time without the opening / closing part 2, and H2 and C2 indicate the retreat time of the present embodiment in which the opening / closing part 2 is provided. H1 and H2 indicate the case where the hot water temperature adjusting unit is at the high temperature position, and C1 and C2 indicate the case where the hot water temperature adjustment unit is at the low temperature position.
(The retreat time in the graph is indicated by the retreat time from the operation time of the fire extinguishing operation, and L indicates the time until the faucet is closed, and indicates the limit for shortening the retreat time.)
As can be seen from the graph, the retreat time, which conventionally took 0.7 to 0.8 seconds, is shortened to 0.4 to 0.5 seconds by providing the opening / closing part 2.
Furthermore, when the hot water temperature adjusting unit 18 is at the low temperature position C2, the reverse time delayed by about 0.1 second compared to the high temperature position can be set to be substantially the same as the high temperature position H2.
[0022]
As described above, according to the former stop-type gas water heater of the present embodiment, there is no problem in practical use by including the opening / closing part 2 that allows the primary chamber 13 and the secondary chamber 12 to communicate with each other only when the water is stopped. Retreat time can be shortened to a certain extent.
Therefore, even if the ignition operation is performed immediately after the fire extinguishing operation, the magnet type safety valve can be reliably pushed and opened to be held by suction.
In addition, in the prior art, the retreat time until the hot water temperature adjusting unit 18 reaches the stop position differs depending on whether the hot water temperature control unit 18 is at a high temperature position or a low temperature position.
Therefore, when the ignition operation is performed immediately after the fire-extinguishing operation, there is no such thing as ignition at a high temperature but no ignition at a low temperature, and there is no sense of incongruity during the operation.
[0023]
As mentioned above, although the Example of this invention was described, this invention is not limited to such an Example at all, Of course, in the range which does not deviate from the meaning of this invention, it can implement in a various aspect.
For example, in this embodiment, the ball-type valve opening device 34 fitted to the spindle 37 is shown and described as the valve-opening device 34 for opening the magnet-type safety valve 33. However, the magnet-type safety valve 33 is pushed by water pressure. Any other configuration may be used as long as it is a valve opening device that moves and opens.
[0024]
Further, the opening / closing part 2 is partitioned by a pressure-sensitive diaphragm 8 that is movable up and down, and an atmosphere chamber 9a that is open to the atmosphere on the upper side and a pressure receiving chamber 9b that communicates with the primary chamber 13 of the hydraulic pressure actuating device 1 on the lower side are provided. However, a configuration in which the entire opening / closing portion 2 is provided upside down or a configuration in which the opening / closing portion 2 is provided sideways may be employed.
[0025]
【The invention's effect】
As described above in detail, according to the main stop gas water heater of the present invention, by shortening the reset time of the valve opening device, even if the ignition operation is performed immediately after the fire extinguishing operation, the magnet type safety valve is pushed. The valve can be opened to ensure ignition.
As a result, it is possible to perform an ignition operation without any ignition mistakes, so that an excellent effect of improving usability can be achieved.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic configuration diagram of a main-stop gas water heater as one embodiment.
FIG. 2 is an explanatory view showing the operation of the valve opening part (during ignition).
FIG. 3 is an explanatory view showing the operation of the valve opening part (when extinguishing a fire).
FIG. 4 is a graph showing the relationship between the reverse time of the valve opening device and the water pressure.
FIG. 5 is a schematic view showing the operation of the valve opening device (stopped state).
FIG. 6 is a schematic view showing the operation of the valve opening device (pressed state).
FIG. 7 is a schematic view showing the operation of the valve opening device (disengaged state).
FIG. 8 is a schematic view showing the operation of the valve opening device (combustion state).
FIG. 9 is a schematic view showing the operation of the valve opening device (engaged return state).
FIG. 10 is a schematic configuration diagram of a conventional non-removable gas water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water pressure response apparatus 2 Opening-closing part 4 Water pressure automatic valve 5 Valve spring 6 Communication path 7 Valve 8 Pressure sensitive diaphragm 9a Atmospheric chamber 9b Pressure receiving chamber 10 Spring 12 Secondary chamber 13 Primary chamber 33 Magnet type safety valve 34 Valve opening device 37 Spindle

Claims (1)

A heat exchanger that heats water in the water through the combustion heat of the burner;
A magnet-type safety valve provided in the gas flow path to the burner and held open by electromagnetic force;
A faucet provided in the water supply path to the heat exchanger, for opening and closing the water supply path;
A water pressure responsive device that is provided in the middle of a water supply path from the water faucet to the heat exchanger, and generates a differential pressure between the primary chamber and the secondary chamber divided by a diaphragm by passing water to the heat exchanger;
A spindle that moves back and forth due to the differential pressure by the water pressure actuator,
A valve opening device provided at the tip of the spindle and opening the magnet-type safety valve;
An engagement mechanism for releasing the engagement state between the spindle and the valve opening device after the magnet safety valve has been opened, and re-engaging the spindle and the valve opening device in the middle of retreat of the spindle due to the stoppage of water flow; In the former type gas water heater with
A communication path communicating the primary chamber and the secondary chamber of the water pressure actuator;
An open / close type gas water heater comprising: an open / close valve that closes the communication passage when the water pressure in the primary chamber reaches a predetermined water pressure and opens the communication passage when the water pressure in the primary chamber becomes less than the predetermined water pressure. vessel.

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