JP2008267800A - Gas water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas water heater equipped with a valve opening device capable of setting a magnet type safety valve to a fully open position even if a valve element of the magnet type safety valve sticks to a seat. <P>SOLUTION: The valve opening device 8 is provided on the tip side of a spindle 37 transmitting the displacement of a water pressure reacting device 16. The valve opening device 8 has an outer cylinder body 3; an inner cylinder body 4 slidably moved in an axial direction in the outer cylinder body 3 by the advance/retreat of the spindle 37; a rotation body 5 transmitting an advancing force from the inner cylinder body 4; and a pushing body 9 pushing the magnet type safety valve 7 by the transmitted advancing force. Until the spindle 37 advances and reaches the valve opening completed position of the magnet type safety valve 7, the magnet type safety valve 7 is pressed and opened by the inner cylinder body 4, the rotation body 5 and the pushing body 9. After reaching the valve opening completed position, the rotation body 5 retreats between ribs 4a of the inner cylinder body 4 while rotating to bring the magnet type safety valve 7 into a closable state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas water heater provided with a device that pushes and opens a magnet-type safety valve by water pressure.

  In general, gas appliances incorporate a magnet-type safety valve that stops gas outflow when the combustion flame disappears inadvertently. The presence or absence of a combustion flame during combustion is monitored by the flame guard or the thermoelectromotive force of a thermocouple, etc. If there is a combustion flame, the magnet type safety valve is held open by the power (or thermoelectromotive force) of the dry cell and burned. When the flame disappears, the energization is stopped (or the thermoelectromotive force is lowered) and the valve opening holding force is released to close the valve. In order to set the valve opening at the time of ignition, it is necessary to push the pressing force against the attracting surface of the magnet type safety valve and to release the pushing force that allows the magnet type safety valve to be closed after the attracting. The pushing force is known to use water pressure in addition to that caused by human power or other electromagnetic force.

  This water pressure is disclosed by the present applicant in Japanese Utility Model Laid-Open No. 4-1789. As an example, a magnet-type safety valve opening device incorporated in a gas water heater is shown in FIGS. It explains using. For the gas water heater in which the valve opening device is incorporated, see the embodiment of the present application in FIG.

  A valve opening device 80 for opening and setting the magnet type safety valve 7 is provided at the tip of the spindle 82 that moves forward and backward according to the water flow pressure. The valve opening device 80 includes a pusher 83 that pushes the magnet safety valve 7 and an absorption spring that absorbs a forward stroke by the pusher 83 when a predetermined pushing force that can fully open the magnet safety valve 7 is reached. 84 and the spindle 82 are disengaged and retracted to retract the magnet safety valve 7 into a state in which the magnetic safety valve 7 can be closed. And a ball 40 for locking the valve opening device 8 again.

  When the water heater is started and water is passed through, the hydraulic pressure actuating device 16 generates a pushing force, whereby the pushing force is transmitted to the water-side shaft 14 and the spindle 82 overcomes the force of the spring 81 and is integrated with the water-side shaft 14. And move forward. The valve opening device 80 is engaged with the spindle 82 and moves forward (in the left direction in the drawing) until the magnetic safety valve 7 is opened and sucked, and the pushing force for opening and pressing the magnetic safety valve 7 Then, the engagement with the spindle 82 is released, and the magnet type safety valve 7 slides back on the spindle 82 to the position where the valve can be closed (rightward in the drawing). Further, when the water flow is stopped, the spindle 82 is returned to the initial stop position by the water pressure responsive device 16 so that the valve opening device 80 and the spindle 82 are engaged again.

  As shown in FIG. 12, the valve opening device 80 starts pushing the magnet safety valve 7 from the state of the stop position (A) when the spindle 82 moves forward, and starts the valve opening. Further, the spindle 82 pushes the attracting piece 46 of the magnet type safety valve 7 to the attracting surface of the electromagnet 47 (B).

  Further, when the spindle 82 moves forward, the valve opening device 80 and the spindle 82 are disengaged by the pushing force, and the valve opening device 80 moves backward while sliding on the spindle 82 to push the magnet safety valve 7. Release movement (C). The release of the pushing force is due to the disengagement between the ball 40 and the recess 41 of the spindle 82. Further, when the spindle 82 moves forward to the left side in the drawing, the state (D) is reached, and the hydraulic automatic valve 30 is pushed by the pushing member 29 integrated with the spindle 82 to open and gas starts to flow.

  When the fire is extinguished by the operation button 18, the faucet 10 is closed and the water is stopped. Then, the water pressure responsive device 16 eliminates the differential pressure between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6, and the force of the spring 81 starts to return the spindle 82 to the stop position (right direction in the figure). When the spindle 82 moves backward to close the return water pressure automatic valve 30 and then moves back to near the stop position, the valve opening device 80 and the spindle 82 are re-engaged (reset) to prepare for the next ignition (A). .

  However, the valve element 43 of the magnet type safety valve 7 sticks to the seat portion 35 of the main body and requires a large pressing force when the valve is opened, or the spindle 82 operates fast due to high water pressure, and the magnet type safety valve 7 is shockedly pushed. In the case of movement, the valve opening device 80 reaches a pushing load for releasing the engagement with the spindle 82 before reaching the fully open position, and the magnet safety valve 7 cannot be pushed sufficiently. There was a problem that the gas water heater did not ignite. This is because the absorption spring 84 of the valve opening device 8 is compressed by the pushing force only by reaching the valve opening start position of the magnet safety valve 7, and the ball 40 is detached from the concave portion 41 of the spindle 82, and the magnet safety valve 7. This is because the valve opening device 80 releases the engagement with the spindle 82 and retracts before reaching the fully open position.

  Therefore, the gas water heater of the present invention solves the above problems, and even if a large pressing force is required at the start of valve opening due to sticking of the valve body and seat part of the magnet type safety valve during ignition operation, An object of the present invention is to provide a gas water heater provided with a valve opening device that reliably moves the safety valve to the fully open position.

The gas water heater according to claim 1 of the present invention for solving the above-mentioned problems is
A spindle that moves forward and backward toward the upstream side and downstream side of the gas flow path according to the water flow pressure;
A magnet-type safety valve that is provided in the gas flow path and is held open by an energizing current and closes the gas flow when the energizing current decreases;
Water pressure automatic valve provided on the downstream side with respect to the gas flow of the gas flow path than the magnet type safety valve,
A valve opening device provided between the safety valve and a water pressure automatic valve for transmitting the forward force of the spindle to the magnet safety valve to open the magnet safety valve;
A pressing member that is fixed to the spindle and transmits the forward force of the spindle to the hydraulic automatic valve body to open the hydraulic automatic valve;
The valve opening device is
An outer cylinder provided in the gas flow path;
An inner cylinder that is provided on the inner periphery of the outer cylinder and moves forward and backward with the spindle;
When the inner cylinder is located upstream of the gas flow path and is in contact with the inner cylinder, the advance force of the inner cylinder is transmitted to the magnet safety valve to open the magnet safety valve, while the inner cylinder When the state of contact with the cylinder is released, it is constituted by a transmission member that is urged by the urging means and moves backward with respect to the inner cylinder to the downstream side of the gas flow path,
The pressing member is fixed to the spindle so as to be separated from the water pressure automatic valve when the inner cylinder and the transmission member are in contact with each other, and the contact state between the transmission member and the inner cylinder is released. A gas water heater in which when the transmission member is retracted downstream, the spindle is brought into contact with the hydraulic automatic valve body so as to transmit the forward force of the spindle to the hydraulic automatic valve body. ,
A plurality of ribs are provided at equal intervals in the circumferential direction on the inner peripheral surface of the outer cylinder, and a guide is formed between the adjacent ribs along the advance / retreat direction of the spindle,
The same number of ribs as the guides are provided on the outer peripheral surface of the inner cylinder, and the same number of arms as the guides are provided on the outer peripheral part of the transmission member. In each guide of the tube,
The spindle is advanced by forming the upstream end surface on the inner cylinder side and the upstream end surface on the outer cylinder side on an inclined surface inclined in the same direction from the upstream side to the downstream side of the gas flow path. When the transmission member of the valve opening device opens the magnet type safety valve, the upstream end face of each rib on the inner cylinder side, and the upstream side of the rib on the outer cylinder side adjacent to each rib on the inner cylinder side An inclined surface that is substantially flush with the end surface is formed, and the arm portion of the transmission member is moved from the upstream end surface of the rib on the inner cylinder side to the upstream end surface on the outer cylinder side to retract the transmission member. Is the gist.

  In the gas water heater according to claim 1 of the present invention having the above-described configuration, when water is passed by an ignition operation, the spindle and the inner cylinder of the valve opening device move forward, and in accordance therewith, the inner cylinder is in contact with the inner cylinder. The transmission member at the forward position moves forward along the guide of the outer cylinder toward the upstream magnet-type safety valve. The transmission member in contact with the magnet type safety valve transmits the advance force of the spindle to the magnet type safety valve and pushes the magnet type safety valve open. It should be noted that during the period from the start of advancement of the spindle until the opening of the magnetic safety valve is completed (until the transmission member and the inner cylinder are in contact with each other), the spindle pressing member and the water pressure automatic valve Are separated from each other, and since the transmission member is in contact with the magnet-type safety valve and further forward movement of the spindle is restricted, the water pressure automatic valve is kept closed. . On the other hand, when the opening of the magnet type safety valve is completed, the inner cylinder of the valve opening device has an inclined surface of the upstream end face of the rib of the inner cylinder, which is substantially the same as the inclined face of the upstream end face of the rib of the outer cylinder. It advances until it forms a single inclined surface. At this time, the transmission member is urged downstream by the urging means, and each arm portion extends from the upstream end face of the rib of the inner cylinder along the inclined surface which is substantially flush with the outer cylinder. It moves toward the upstream end face of the rib. As a result, the contact state between the transmission member and the inner cylinder is released, the transmission member moves backward with respect to the inner cylinder toward the downstream side of the gas flow path, and there is a gap between the transmission member and the magnet type safety valve. Thus, the magnet type safety valve can be closed and the spindle can be advanced. When the spindle advances, the pressing member abuts against the water pressure automatic valve body and moves forward until the water pressure automatic valve is pushed open, and the water pressure automatic valve is opened. As described above, the magnet type safety valve and the water pressure automatic valve are sequentially opened to enable gas supply. When the water flow is stopped by the fire extinguishing operation, the spindle moves backward to close the automatic water pressure valve, and the spindle further moves backward to face the upstream end face of the inner cylinder side rib and the outer cylinder side rib. It becomes one state. At this time, each arm portion of the pressing member moves from the upstream inclined surface of the rib on the outer cylinder side onto the inclined surface of the rib on the inner cylinder side, and the state before the ignition operation (the pressing member and the inner cylinder are in contact with each other). To the next ignition operation.

  In the gas water heater according to the present invention, as described above, the inner cylinder-side rib and the outer cylinder-side rib of the valve opening device are flush with each other only after the magnet-type safety valve is opened. The member moves backward with respect to the inner cylinder so that the magnet-type safety valve can be closed, and the pressing member fixed to the spindle reaches the position at which the water pressure automatic valve body can be opened (position where it abuts the water pressure automatic valve body). Until you can move forward. For this reason, even if the valve body of the magnet type safety valve is stuck to the seat of the main body or the spindle operates fast due to high water pressure and the magnet type safety valve is pushed impactfully, the magnet type safety valve is securely connected. Can be opened. As described above, the spindle is further moved forward after the magnet type safety valve can be closed, and the water pressure automatic valve is opened. It can be closed.

  Next, specific embodiments of the gas water heater according to the present invention will be described with reference to the drawings. FIG. 1 shows a schematic view of a gas water heater according to an embodiment of the present invention.

  The gas water heater in this embodiment includes a valve opening device 8 that pushes and opens the magnet-type safety valve 7 by water pressure, and the differential pressure between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6 by water flow. And a hydraulic pressure actuating device 16 that generates a pushing force to the diaphragm 6 that can freely move forward and backward, and an intermediate position between the above-described valve opening device 8 and the spindle 37 on the tip side of the spindle 37 that is moved forward by the hydraulic pressure actuating device 16. And a water pressure automatic valve 30 for opening and closing the gas flow path. The automatic water pressure valve 30 is provided with a return spring 27 that urges the valve 37 in the closing direction and urges the spindle 37 in the backward direction. The gas supply path passes from the gas inlet to the main burner 50 via the water pressure automatic gas valve 30 via the magnet safety valve 7, the instrument plug 19 that opens and closes the gas flow path by the manually operated operation button 18. The flow path between the instrument plug 19 and the hydraulic automatic gas valve 30 is branched to provide a flow path to the sensing burner 51 that can detect the combustion state and can move to the main burner 50. The sensing burner 5 generates a thermoelectromotive force by heating a thermocouple (not shown), and when the room is in an oxygen-deficient atmosphere due to combustion exhaust gas, the combustion flame is lifted before the main burner 50 is incompletely combusted. The generated electromotive force is reduced.

  The magnet type safety valve 7 is provided in the valve chamber 13 on the upstream side of the gas passage. 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 35. An adsorption piece 46 is provided at the other end of the valve shaft 36 and faces the adsorption surface of the electromagnet 47.

  As shown in FIG. 2, the valve opening device 8 is provided downstream of the magnet type safety valve 7, is opposed to the magnet type safety valve 7, and is provided on the tip end side of the spindle 37 that transmits the forward movement of the water pressure actuator 16. The valve opening device 8 includes a cylindrical outer cylinder 3 fixed to the main body 2, and an inner cylinder 4 that is slidable in the axial direction in the outer cylinder 3 as the spindle 37 advances and retreats. The rotating body 5 to which the forward force from the inner cylinder 4 is transmitted and the pusher 9 that pushes the magnet-type safety valve 7 by the forward force that is transmitted (the rotary body 5 and the pusher 9 are composed of This corresponds to the transmission member of the present invention). Each of the contact portions of the outer cylindrical body 3, the inner cylindrical body 4 and the rotating body 5 is provided with four cam portions, which will be described later, on the entire circumference.

  FIG. 3 is an explanatory diagram schematically showing a plurality of cam portions. In the outer cylinder 3 shown in the figure, the outer cylinder portion is omitted, and only the ribs provided on the inner peripheral surface are shown. Four ribs 3a and three grooves 3b are alternately formed on the inner peripheral surface of the outer cylindrical body 3, and a spline surface 3c having a helical inclination at the axial center is formed on the upstream end surface of the rib 3a. Is done. Further, on the outer peripheral surface of the inner cylindrical body 4, four ribs 4a that fit into the respective grooves 3b in the outer cylindrical body 3 are formed, and the spline that inclines in the same direction also on the upstream end surface of the rib 4a. Surface 4c is formed. Further, the inner cylinder 4 is biased in the downstream (retreat) direction by the spring 11 and is locked to the step portion 12 of the spindle 37 so that the forward force from the spindle 37 is transmitted (FIG. 2). ). On the other hand, the rotating body 5 is provided with four arms 5a fitted in the respective grooves 3b of the outer cylindrical body 3, and forms a disk shape having a center hole 5d (FIG. 9). Then, a spline surface 5c inclined in the same direction is formed on the end surface of the arm 5a on the retreat side, and a contact spring (biasing force) in the retreat direction so as to abut against the spline surface 4c of the rib 4a of the inner cylinder 4 (Means) 15 (FIG. 2).

  Further, a cylindrical pusher 9 having a contact surface with the magnet safety valve 7 at one end is inserted into the center hole 5d of the rotating body 5 (FIG. 2), and the pusher 9 fully opens the magnet safety valve 7. In this case, an absorption spring 18 that is compressed and absorbs an extra stroke is provided between the pushing body 9 and the rotating body 5 so that the pushing body 9 does not come out of the rotating body 5 by the force of the absorbing spring 18. The locking end 9 d of the pusher 9 is locked around the center hole of the rotating body 5. Further, a step portion 9c for locking the rotating body 5 is provided on the outer peripheral surface of the pushing body 9 inserted through the center hole 5d of the rotating body 5 so as not to be compressed more than a predetermined dimension. Even if the absorption spring 18 is compressed when the valve element 43 of the magnet type safety valve 7 is fixed to the seat surface 35, the step part 9c is engaged with the rotary element 5 so that the valve element 43 It is provided in a positional relationship for breaking the adhesion and opening the magnet type safety valve 7.

  A water pressure automatic valve 30 slidably inserted into the spindle 37 is provided downstream of the valve opening device 8 (FIG. 1), and is urged to close in the downstream direction by a return spring 27, so that the seat of the main body 2 is seated. The second valve chamber 17 is formed in the section with the valve body 43 by contacting and separating from the portion 39. The spindle 37 is provided with a pressing member 29 (corresponding to the pressing member of the present invention) 29 for opening the water pressure automatic valve 30, the opening of the magnet safety valve 7 is completed, and the rotating body 5 of the valve opening device 8 is moved backward. After that, the water pressure automatic valve 30 is provided in such a positional relationship that it is pushed by the pushing member 29 of the spindle 37 and opened.

  Next, each operation | movement about the valve opening apparatus 8 is demonstrated. 5-11 is explanatory drawing of operation | movement of the valve opening apparatus 8 integrated in the water heater. FIG. 4 shows the state of the cam portion in each operation. When the water heater is started and water is passed, the pushing force is transmitted to the water side shaft 14 of the water pressure actuator 16. For this reason, the spindle 37 overcomes the force of the return spring 27 and moves forward together with the water-side shaft 14. Further, the inner cylinder 4 of the valve opening device 8 moves forward integrally with the locked spindle 37 (FIG. 5 → FIG. 6). As the inner cylinder 4 of the valve opening device 8 moves forward, the rib 4a of the inner cylinder 4 comes into contact with the arm 5a of the rotating body 5 in the groove 3b of the outer cylinder 3, and the spindle 37 → the inner cylinder 4 → Rotating body 5 → Pushing body 9 → Advance force is transmitted to the magnet type safety valve 7 ((a) → (b) → (c) in FIG. 4), and the magnet type safety valve 7 from the state of the stop position (FIG. 5). Start pressing to start valve opening. Further, the spindle 37 pushes the attracting piece 46 of the magnet type safety valve 7 to the attracting surface of the electromagnet 47 (FIG. 7).

  When the magnet-type safety valve 7 reaches the fully open position, the pusher 9 cannot move forward, but the absorption spring 18 provided between the rotary member 5 and the pusher 9 is compressed, and the inner cylinder 4 further rotates the rotary member 5. Is moved ((d) of FIG. 4). Thereby, after reaching the valve opening completion position of the magnet type safety valve 7, the advance stroke by the pusher 9 can be absorbed and the magnet type safety valve 7 can be protected. When the arm of the rotating body 5 moves to a position exceeding the upper end of the rib 3a of the outer cylindrical body 3, the rib 3a of the outer cylindrical body 3 cannot guide the arm 5a of the rotating body 5, and the rotating body 5 Along with the inclination of the spline surfaces 4c and 3c in the ribs 4a and 3a of the outer cylinder 3, the outer cylinder 3 moves backward while rotating to a position where it abuts on the side surface of the rib 4a of the inner cylinder 4 adjacent in the rotation direction. Retreat on the spline surface 3c of the rib 3a ((e) → (f) in FIG. 4) (FIG. 8). The retracted position of the rotating body 5 is set in advance by the inclination angle of the spline surfaces 3c, 4c, and 5c so that the pusher 9 is separated from the magnet type safety valve 7 and the magnet type safety valve 7 can be closed. ing. Therefore, when the rotating body 5 of the valve opening device 8 is retracted and retracted, the magnet safety valve 7 is brought into a valve closeable state (FIG. 8). Therefore, the gas flow path can be reliably closed in the event of an abnormality after the start of combustion.

  Further, when the spindle 37 moves forward, the hydraulic automatic valve 30 is pushed and opened by the pushing member 29 integrated with the spindle 37, and gas starts to flow (FIG. 9 → FIG. 10). The gas flows to the burner 50, and the gas is ignited by the discharge of an igniter (not shown) to start combustion ((f) → (g) in FIG. 4).

  Next, when the operation button 18 is used to extinguish the fire, the faucet 10 is closed to stop water. Then, the water pressure responsive device 16 eliminates the differential pressure between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6, and the return spring 27 force starts to return the spindle 37 to the stop position (right direction in FIG. 1). 4 rib 4a retreats in the groove 3b of the outer cylindrical body 3 ((h) of FIG. 4). The spindle 37 is retracted to close the return water pressure automatic valve 30, the tip of the rib 4a of the inner cylinder 4 is retracted to the lower end position of the arm 5a of the rotating body 5, and the arm 5a of the rotating body 5 is adjacent to the rotation direction. While rotating to a position where it contacts the side surface of the rib 3a of the outer cylinder 3 to be moved, it moves backward on the spline surface 4c of the rib 4a of the inner cylinder 4 ((i) in FIG. 4). That is, the rotating body 5, the arm 5 a of the valve opening device 8 and the rib 4 a of the inner cylinder body 4 come into contact again. Then, the rib 4a of the inner cylinder 4 retreats in the groove 3b of the outer cylinder 3, and the arm 5a of the rotating body 5 retreats in the groove 3b and returns to the initial stop state ((j) in FIG. 4). In preparation for the next ignition (FIG. 5).

  As described above, the gas water heater automatically opens the magnet safety valve 7 by using the water flow pressure, so that it is possible to eliminate the need for electric power for opening the magnet safety valve 7. In addition, since the automatic water pressure valve 30 is opened after the magnet type safety valve 7 is brought into a closeable state, the gas flow path can be reliably closed at the time of abnormality after the start of combustion. Furthermore, since the rotating body 5 is interposed again between the spindle 37 and the pusher 9 in the middle of the retreat of the spindle 37 due to the stoppage of the water flow of the gas water heater, it can be stopped in a state ready for the next re-ignition.

  Moreover, after reaching the valve opening completion position of the magnet type safety valve 7, the valve opening device 8 retracts the rotating body 5 so that the magnet type safety valve 7 can be closed. That is, the pushing force to the magnet safety valve 7 by the pusher 9 is not released at the valve opening start position of the magnet safety valve 7. Therefore, since the pushing force is released after reaching the valve opening completion position of the magnet type safety valve 7, the valve element 43 of the magnet type safety valve 7 is stuck to the seat portion 35, or the spindle 37 operates fast due to high water pressure. Even when the magnet-type safety valve 7 is shockedly pushed, the magnet-type safety valve 7 can be reliably opened. Further, the number of parts is reduced as compared with the conventional valve opening device 8, and the valve opening device 8 can be manufactured at low cost.

  In the conventional example shown in FIG. 12, when the spindle 82 is retracted and locked after the fire is extinguished, the absorption spring 84 force of the valve opening device 80 causes the ball 40 to move to the spindle 82. Because of the pressure contact, the sliding resistance of the spindle 82 was increased. On the other hand, in the present embodiment, the ball 40 that is pressed against the spindle 82 and sliding is not used, and the spline surface 4c of the inner cylinder 4 and the spline surface 5c of the rotating body 5 are simply contacted to open. The valve device 8 is reset (FIG. 3). Therefore, the sliding resistance accompanying the backward movement of the spindle 37 can be reduced.

  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, the stroke absorption mechanism has been described as being provided on the valve opening device 8 side with the valve body 43 of the magnet type safety valve 7 interposed therebetween, but may be provided on the magnet type safety valve 7 side.

It is a schematic block diagram of the water heater which concerns on one Embodiment of this invention. It is an enlarged view of the valve opening apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the cam part of the valve opening apparatus which concerns on one Embodiment of this invention. It is operation | movement explanatory drawing of the cam part of the valve opening apparatus which concerns on one Embodiment of this invention. It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (stop state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (valve-opening start state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (fully opened state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (pushing force cancellation | release state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (The valve opening start state of a hydraulic automatic valve). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (combustion state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on one Embodiment of this invention (reset state). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on a prior art ((A) stop position). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on a prior art ((B) fully open of a magnet type safety valve). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on a prior art (after cancelling | releasing (C) valve opening apparatus). It is operation | movement explanatory drawing of the valve opening apparatus which concerns on a prior art ((D) Water pressure automatic valve full open (combustion state)).

Explanation of symbols

3 Outer cylinder 3a Rib 3b Groove 3c Spline surface 4 Inner cylinder 4a Rib 4c Spline surface 5 Rotating body 5a Arm 5c Spline surface 7 Magnet type safety valve 8 Valve opening device 9 Pushing body 16 Hydraulic response device 30 Hydraulic automatic valve 37 Spindle

Claims (1)

A spindle that moves forward and backward toward the upstream side and downstream side of the gas flow path according to the water flow pressure;
A magnet-type safety valve that is provided in the gas flow path and is held open by an energizing current and closes the gas flow when the energizing current decreases;
Water pressure automatic valve provided on the downstream side with respect to the gas flow of the gas flow path than the magnet type safety valve,
A valve opening device provided between the safety valve and a water pressure automatic valve for transmitting the forward force of the spindle to the magnet safety valve to open the magnet safety valve;
A pressing member that is fixed to the spindle and transmits the forward force of the spindle to the hydraulic automatic valve body to open the hydraulic automatic valve;
The valve opening device is
An outer cylinder provided in the gas flow path;
An inner cylinder that is provided on the inner periphery of the outer cylinder and moves forward and backward with the spindle;
When the inner cylinder is located upstream of the gas flow path and is in contact with the inner cylinder, the advance force of the inner cylinder is transmitted to the magnet safety valve to open the magnet safety valve, while the inner cylinder When the state of contact with the cylinder is released, it is constituted by a transmission member that is urged by the urging means and moves backward with respect to the inner cylinder to the downstream side of the gas flow path,
The pressing member is fixed to the spindle so as to be separated from the water pressure automatic valve when the inner cylinder and the transmission member are in contact with each other, and the contact state between the transmission member and the inner cylinder is released to A gas water heater in which, when the transmission member is retracted downstream, the spindle is brought into contact with the hydraulic automatic valve body so as to transmit the advance force of the spindle to the hydraulic automatic valve body,
A plurality of ribs are provided at equal intervals in the circumferential direction on the inner peripheral surface of the outer cylinder, and a guide is formed between the adjacent ribs along the advance / retreat direction of the spindle,
The same number of ribs as the guides are provided on the outer peripheral surface of the inner cylinder, and the same number of arms as the guides are provided on the outer peripheral part of the transmission member. In each guide of the tube,
The spindle is advanced by forming the upstream end surface on the inner cylinder side and the upstream end surface on the outer cylinder side on an inclined surface inclined in the same direction from the upstream side to the downstream side of the gas flow path. When the transmission member of the valve opening device opens the magnet type safety valve, the upstream end face of each rib on the inner cylinder side, and the upstream side of the rib on the outer cylinder side adjacent to each rib on the inner cylinder side An inclined surface that is substantially flush with the end surface is formed, and the arm portion of the transmission member is moved from the upstream end surface of the rib on the inner cylinder side to the upstream end surface on the outer cylinder side to retract the transmission member. Gas water heater characterized by.

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