JPH11211072A - Non-stop gas water heater - Google Patents

Abstract

(57) Abstract: An object of the present invention is to make it possible to securely hold a magnetic safety valve by suction even if an ignition operation is performed immediately after a fire extinguishing operation. . SOLUTION: A valve opening device 34 for pushing and opening a magnet type safety valve 33 is provided at a distal end portion of a spindle 37 which moves and retreats by generating a differential pressure in the hydraulic pressure response device 1 by passing water, and the primary chamber 13 of the hydraulic pressure response device 1 Communication path 6 that communicates with secondary chamber 12
Is closed when water is supplied and opened when water is stopped. The valve opening device 34 engages with the spindle 37 and moves forward integrally, and after opening the magnet type safety valve 33, the spindle 37
Is released, and retreats on the spindle 37. When the passage of water is stopped, the communication passage 6 is opened, the water is rapidly moved from the primary chamber 13 to the secondary chamber 12 through the communication passage 6, and the retreat speed of the spindle 37 returning to the stop position is reduced. As a result, the return of engagement between the valve opening device 34 and the spindle 37 is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main stop type gas water heater provided with a valve opening device for pushing and opening a magnet type safety valve by water pressure.

[0002]

2. Description of the Related Art Generally, a gas safety device is incorporated in a gas appliance to close a fuel gas passage when a combustion flame is extinguished during combustion. The magnet type safety valve is energized by the dry cell power when the combustion flame is detected by the thermal electromotive force of the frame guard or thermocouple, etc., and is kept open. The force is released and the valve closes. The magnetic safety valve is
Since the valve opening operation cannot be performed by itself, the valve is set to be opened by being pressed against the suction surface by the pushing force at the time of ignition, and the valve can be closed by releasing the pushing force. As the pressing force for setting the opening of such a magnet type safety valve, there is known a pressing force using water pressure in addition to a manual force or other electromagnetic force.

[0003] The main stop type gas water heater utilizing this water pressure is disclosed by the present applicant in Japanese Utility Model Laid-Open No. 4-1789. As an example, a magnet safety valve incorporated in the main stop type gas water heater is disclosed. The valve opening device will be described with reference to FIG. Note that the main stop type gas water heater is shown in FIG.
See embodiments of the present application.

[0004] In this main stop type gas water heater, a water pressure responsive device 1 that operates by a 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. Can be This valve opening device 34 is slidably movable on a spindle 37 so that a magnetic safety valve 33 is provided.
The magnet-type safety valve 33 is opened and engaged with the spindle 37 until the suction is performed, and moves integrally. After the magnet-type safety valve 33 is fully opened, the engagement with the spindle 37 is released. And the magnetic safety valve 33
Slides back on the spindle 37 to a position where the valve can be closed. Then, when the flow of water is stopped, the hydraulic pressure responsive device 1 returns the spindle 37 to the initial stop position, and the valve opening device 34 and the spindle 37 are engaged and returned (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 suction position, and to retract to a position where the closing of the magnet type safety valve 33 is not hindered (release of pressing). Therefore, in order to recover the pressing ability in preparation for the next ignition operation, it is necessary to perform the engagement between the spindle 37 and the valve opening device 34, that is, the resetting. This reset position is a position close to the stop position where the spindle 37 is returned.

[0006]

By the way, when the ignition operation is performed a long time after the fire extinguishing operation,
Since the gas in the gas flow path is replaced by air, it may not be possible to ignite by one ignition operation. In such a case, the user presses the operation button 17 to perform the fire extinguishing operation, and then performs the ignition operation again. However, there is a problem that an ignition mistake may occur depending on the timing. This is because if the ignition operation is performed immediately after the fire extinguishing operation, the spindle 37 moves forward without returning the spindle 37 to the stop position, and the valve opening device 34 and the spindle 37 cannot return to the engaged state. The device 34 is a magnetic safety valve 33
Cannot be pushed and opened. In view of the above, the main stop gas water heater according to the present invention solves the above-mentioned problem, and enables the magnetic safety valve to be reliably pushed and opened and sucked and held even if the ignition operation is performed immediately after the fire extinguishing operation. The purpose is to:

[0007]

According to a first aspect of the present invention, there is provided a main water heater having a heat exchanger for heating water in a water flow by the heat of combustion of a burner. A magnet-type safety valve provided in a gas flow path to the valve and held open by electromagnetic force; a water tap 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 to generate a differential pressure between the primary chamber and the secondary chamber partitioned by the diaphragm by passing water to the heat exchanger, and moves forward and backward by the differential pressure by the water pressure responsive device. A spindle, a valve opening device provided at the distal end of the spindle, for opening and closing the magnet type safety valve, and disengaging the spindle and the valve opening device after completion of opening the magnet safety valve, and stopping water flow. By above spi In a main stop type gas water heater having an engagement mechanism for re-engaging the spindle and the valve opening device during the retraction of the dollar, the primary chamber and the secondary chamber of the water pressure responsive device communicate with each other. The gist of the present invention is to provide a communication passage for closing the communication passage when the water pressure in the primary chamber reaches a predetermined water pressure, and an opening / closing valve for opening the communication passage when the water pressure in the primary chamber becomes lower than the predetermined water pressure.

[0008] In the main stop type gas water heater according to the first aspect of the present invention having the above-described structure, when the flow of water is started and the water pressure in the primary chamber reaches a predetermined water pressure, the on-off valve closes the communication passage. Then, the hydraulic pressure responsive device generates a pressure difference between the primary chamber and the secondary chamber, advances the spindle, opens the magnetic safety valve, and starts combustion. Then, when the water flow is stopped and the water pressure in the primary chamber of the hydraulic pressure response device drops, the on-off valve opens the communication passage connecting the primary chamber and the secondary chamber, and the differential pressure between the primary chamber and the secondary chamber disappears, and the spindle Retreats. Therefore, the water is moved from the primary chamber to the secondary chamber through the communication passage, the spindle is quickly retracted, and the 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 suction-held.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of a main stop type gas water heater of the present invention will be described below with reference to the schematic diagram of FIG. I do. The operation button 17 is provided in the water supply path from the water inlet.
Is provided with a water tap 19 for opening and closing the flow path by manual operation of the hydraulic pressure responsive device 1 downstream thereof. The hydraulic pressure responsive device 1 is provided with a diaphragm 15 that is movable back and forth, and is partitioned by the diaphragm 15 to form a primary chamber 13.
And a secondary chamber 12 are formed. A water governor 16 is provided coaxially with the diaphragm 15 at the entrance to the primary chamber 13 of the hydraulic pressure responsive device 1 to keep the flow rate constant even when the supply water pressure fluctuates. A hot water temperature controller 18 is provided in a flow path (downward in the figure) continuing from the primary chamber 13. In the hot water temperature control unit 18, a flow path passes through a venturi 22 to a heat exchanger 23 and then to a heating path 28 leading to a mixing unit 21.
And a bypass path 20 directly leading to the mixing section 21. Then, the branched flow paths merge at the mixing section 21 to reach a tap. The venturi 22 provided in the heating path 28 has a narrowed flow path and a horizontal hole 22a provided in a direction perpendicular to the flow path. A conduction path 24 is provided from the lateral hole 22a to the secondary chamber 12 of the hydraulic pressure responsive device 1.

The hydraulic pressure responsive device 1 is provided with a communication passage 6 communicating from the primary chamber 13 to the secondary chamber 12. The communication passage 6 is provided with a valve 7 for opening and closing the communication passage 6 in the middle of the communication passage 6. A part 2 is provided. The opening / closing section 2 is partitioned by a pressure-sensitive diaphragm 8 that can move up and down, and an air chamber 9a that is open to the upper side and a pressure receiving chamber 9b that communicates with the primary chamber 13 of the water pressure responsive device 1 are provided on the lower side. Further, a spring 10 for urging the pressure-sensitive diaphragm 8 toward the pressure receiving chamber 9b is provided in the atmosphere chamber 9a. A hole 11 communicating with the secondary chamber 12 of the hydraulic pressure responsive device 1 is provided at the center of the bottom of the pressure receiving chamber 9b. A valve 7 for opening and closing the hole 11 is coaxially fixed to the pressure-sensitive diaphragm 8, and the hole 11 is moved by the pressure-sensitive diaphragm 8 toward the atmosphere chamber 9 a.
Is closed, and the hole 11 is opened with the movement to the pressure receiving chamber 9b side.

As shown in FIG. 5, the spindle 37 is provided on the same axis as the water shaft 14 transmitting the moving force from the hydraulic pressure responsive device 1, and is urged by the return spring 32 in the downstream direction (right direction in the figure). You. Then, when the moving force overcomes the force of the return spring 32, the spindle 37 is advanced to the left in the figure, and the magnetic safety valve 33, valve opening device 34,
Operate.

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 a 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 a seat portion 38 of the main body. In addition, the valve shaft 36
At the other end, a suction piece 46 is provided so as to face the suction surface 47 of the electromagnet.

Downstream of the magnet type safety valve 33, a valve opening device 34 is disposed on the same axis facing the magnet type safety valve 33, and is coaxially inserted into the tip of a spindle 37 for transmitting the movement of the hydraulic pressure responsive device 1. You. Valve opening device 34
Is engaged with the spindle 37 until the magnetic safety valve 33 is opened and suction is performed, and moves integrally. After the magnet type safety valve 33 is fully opened, the engagement with the spindle 37 is performed by the forward movement of the spindle 37. After being opened, the magnetic safety valve 33 slides on the spindle 37 to the position where the valve can be closed, and retreats. When the flow of water is stopped, the spindle 37 returns to the initial stop position by the hydraulic pressure responsive device 1,
The valve-opening device 34 and the spindle 37 are configured so as to be engaged and returned.

Downstream of the valve opening device 34, a spindle 37 is provided.
The hydraulic automatic valve 4 is slidably inserted through the valve body 39, is urged by a valve spring 39 to close in the downstream direction, and comes into contact with and separates from the seat portion 40 of the main body, thereby forming a second section with the valve body. A valve chamber 41 is formed. The spindle 37 is provided with a push member 42 for opening the automatic hydraulic valve 4. After the opening of the magnetic safety valve 33 is completed and the engagement between the spindle 37 and the valve opening device 34 is released, the automatic hydraulic valve 4 is pushed by the pushing member 42 of the spindle 37 and is opened.

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 for performing the ignition / extinguishing operation is provided with an operation switch 30 that is turned on during the ignition operation and maintains the ON state until the next fire extinguishing operation. Further, a water pressure switch 49 for detecting a position due to the movement of the spindle 37 and detecting a water passing or water stopping state is provided near the spindle 37. The operation of each switch is detected by the dry battery power, the discharge to the electrodes, the detection of the combustion flame by the frame guard, the magnet type safety valve 33
Is provided with a controller 29 for holding the valve open. An instrument plug 25 for opening and closing the gas supply path to the burner 27 by the push button 17 is provided upstream of the gas flow path.

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 moving the operation button 17
At the same time, the instrument tap 25 and the faucet 19 are opened mechanically. Then, when the faucet 19 is opened, water flow is started, and water flows into the primary chamber 13 of the hydraulic pressure responsive device 1 (FIG. 2). The pressure in the pressure receiving chamber 9b becomes equal to 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, moves upward together with the valve 7, and closes the communication passage 6. On the other hand, when the water from the primary chamber 13 passes through the venturi 22, the horizontal hole 2 due to the venturi effect is formed.
The secondary chamber 12 of the hydraulic pressure responder 1 according to the decrease of the hydraulic pressure of 2a
Pressure drops. For this reason, a pressure difference is generated between the primary chamber 13 and the secondary chamber 12 of the hydraulic pressure responsive device 1, and a force is generated in the diaphragm 15 that can be moved back and forth in the left direction in the drawing.
This force is transmitted to the water side shaft 14 of the hydraulic pressure response device 1, and the spindle 37 overcomes the force of the return spring 32 and moves integrally with the water side shaft 14 to the left in the drawing (hereinafter, referred to as "forward"). .

The valve opening device 34 starts pushing the valve shaft 36 of the magnetic safety valve 7 from the stop position (state A (FIG. 5)) by the advance of the spindle 37, and starts opening the valve body 43. Further, the spindle 37 is provided with a magnetic safety valve 33.
Is pressed to the attraction surface 47 of the electromagnet (state B (FIG. 6)). At this time, the water pressure switch 49 is turned on just before the attraction piece 46 contacts the attraction surface 47 of the electromagnet.
Then, dry battery power is supplied from the controller 29 to the magnetic safety valve 33, and the open state of the magnetic safety valve 33 is maintained.

Further, when the spindle 37 advances, the engagement between the valve-opening device 34 and the spindle 37 is released by the force, and the valve-opening device 34 retreats while sliding on the spindle 37 to the right in the figure, The push to the safety valve 33 is released (state C (FIG. 7)). The release of the pushing force is caused by the fact that the engagement portion between the ball 51 and the concave portion 52 formed in the spindle 37 is released. Further, when the spindle 37 moves forward, it reaches the state D (FIG. 8), and the automatic hydraulic valve 4 is pushed by the pushing member 42 integrated with the spindle 37 to open and the fuel gas starts flowing to the burner 27.

When the fire extinguishing operation is performed by the operation button 17, the operation button 17 returns to the front and the operation switch 30
Is turned off, the power supply from the controller 29 to the magnetic safety valve 33 is stopped, and the magnetic safety valve 33 is closed. Further, an instrument stopper 25 interlocked with the operation button 17 is provided.
And the faucet 19 is 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 disappears, and the water flows into the secondary chamber 12 while pushing out the water in the primary chamber 13 by the force of the return spring 32. The spindle 37 starts to move to the stop position (to the right in the drawing). At this time, as shown in FIG. 3, the opening / closing section 2 opens the valve 7 by the force of the spring 10 to fully open the communication path 6 between the primary chamber 13 and the secondary chamber 12 of the hydraulic pressure responsive 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 is quickly retracted to the stop position. Then, the push member 42 integrated with the spindle 37 retreats to close the automatic hydraulic valve 4, and the valve opening device 34 and the spindle 37 are re-engaged (state E (FIG. 9)). Accordingly, the valve opening device 34 can quickly recover the pushing ability by the opening / closing section 2 described above and prepare for the next ignition.

In the conventional hydraulic pressure responsive device 1, the opening / closing section 2
Is not provided, water is supplied from the primary chamber 13 to the hot water temperature controller 1
8 and only the flow path which flows from the conduction path 24 into the secondary chamber 12 (FIG. 10). Therefore, the diaphragm 15
Would have to take some time to retreat to the stop position. In addition, since the conduction path 24 is thin and long, the water flow resistance is large, and in addition, when the hot water temperature control section 18 is set to a high temperature, the opening area of the hot water temperature control section 18 is small, and is even larger. The diaphragm 15 could not retreat quickly because of water flow resistance.

The graph shown in FIG. 4 is obtained by comparatively measuring the retreat time of the spindle 37 depending on the presence or absence of the opening / closing section 2. H1 and C1 in the figure indicate the conventional retreat time without the opening / closing section 2, and H2 and C2 indicate the retreat time in the present embodiment with the opening / closing section 2 provided. In addition, H1 and H2 show the case where the hot water temperature adjustment unit is at the high temperature position, and C1 and C2 show the case where the hot water temperature adjustment unit is at the low temperature position. (Note that the retreat time in the graph is indicated by the retreat time from the operation point of the fire extinguishing operation, and L indicates the time until the faucet closes, indicating the limit to which the retreat time can be reduced.) As can be seen from the graph, the retreat time, which conventionally took 0.7 to 0.8 seconds, can be reduced by providing the opening / closing unit 2.
Reduced to 0.4-0.5 seconds. In addition, hot water temperature controller 1
8 is at the low-temperature position C2, compared with 0.
The retreat time delayed by about one second can be set to be substantially the same as the retreat time at the high temperature position H2.

As described above, according to the main stop type gas water heater of the present embodiment, the opening and closing unit 2 that allows the primary chamber 13 and the secondary chamber 12 to communicate only when the water is stopped is provided, so that the actual use is possible. The retreat time can be reduced to the extent that there is no problem.
Therefore, even if the ignition operation is performed immediately after the fire extinguishing operation, the magnetic safety valve can be reliably pushed and opened, and the suction can be held.
In addition, in the conventional apparatus, the retreat time until the hot water temperature control unit 18 reaches the stop position differs depending on whether the hot water temperature control unit 18 is in the high temperature position or the low temperature position. Therefore, when the ignition operation is performed immediately after the fire extinguishing operation, ignition does not occur at a high temperature but does not occur at a low temperature.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the gist of the present invention. It is. For example, in the present embodiment, the valve opening device 3 that opens the magnet type safety valve 33
Although the ball type valve opening device 34 fitted to the spindle 37 is shown and described as 4, any other configuration may be used as long as it is a valve opening device that pushes and opens the magnet type safety valve 33 by water pressure. good.

The opening / closing section 2 is partitioned by a pressure-sensitive diaphragm 8 which can move up and down, and a pressure receiving chamber 9b which communicates with an air chamber 9a which is open to the upper side and a lower chamber which communicates with the primary chamber 13 of the water pressure responsive device 1. However, the configuration may be such that the entire opening / closing unit 2 is provided upside down, or a configuration provided sideways.

[0025]

As described above in detail, according to the main stop type 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 can be operated. The ignition can be reliably performed by pushing and opening the safety valve. As a result, since the ignition operation can be performed without an ignition mistake, there is an excellent effect that the usability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main stop type gas water heater as one embodiment.

FIG. 2 is an explanatory diagram showing an operation of a valve opening section (at the time of ignition).

FIG. 3 is an explanatory diagram showing an operation of a valve opening section (at the time of fire extinguishing).

FIG. 4 is a graph showing a relationship between a retreat time of a valve opening device and a 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 (push-off 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 an operation of the valve opening device (an engagement return state).

FIG. 10 is a schematic configuration diagram of a conventional main stop type gas water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pressure response device 2 Opening / closing part 4 Automatic water pressure 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)

[Claims] 1. A heat exchanger for heating water flowing through by the heat of combustion of a burner, a magnet-type safety valve provided in a gas flow path to the burner and held open by electromagnetic force, and the heat exchanger A water faucet installed in the water supply channel to open and close the water supply channel; and a primary chamber provided in the water supply route from the water faucet to the heat exchanger and partitioned by the diaphragm by water passing through the heat exchanger. A water pressure response device that generates a differential pressure in the next chamber, a spindle that moves forward and backward by the pressure difference caused by the water pressure response device, a valve opening device that is provided at the tip of the spindle, and that opens and opens the magnet type safety valve; After the safety valve is completely opened, an engagement mechanism for disengaging the spindle and the valve-opening device from each other and re-engaging the spindle and the valve-opening device during the retraction of the spindle due to the stoppage of water supply is provided. In the main stop type gas water heater obtained above, a communication path for communicating the primary chamber and the secondary chamber of the hydraulic pressure responsive device, and when the water pressure of the primary chamber reaches a predetermined water pressure, the communication path is closed, and the primary An on-off valve for opening the communication passage when the water pressure in the chamber becomes lower than a predetermined water pressure.