JPH1113931A - Gas water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas water heater having a valve opening device capable of setting a magnet type relief valve to the entirely opening position even if the valve element of the magnet type relief valve is stuck to a sheet part. SOLUTION: The tip side of a spindle 37 for informing the displacement of a hydraulic follower device is provided with a valve opening device 8 by facing a magnet type relief valve 7. The valve opening device 8 consists of a cylindrical outer cover 3 fixed to a body 2, and inner cover 4 slidably, axially moving in the outer cover 3 accompanying with the advancement or retreat by the spindle 37, a rotor 5 receiving advancement force from the inner case 4, and a pushing and moving body 9 for pushing and moving the magnet type relief valve 7 owing to the transferred advancement force. The inner case 4 transfers the pushing and moving force to the rotor 5, and the pushing and moving body 9 to push and open the magnet type relief valve 7 until the magnet type relief valve 7 reaches the valve opening completion position by advancing the spindle 37. When the magnet type relief valve 7 reaches the valve opening completion position, the rotor 5 retreats and refuges between the ribs of the inner case 4 with the rotor 5 rotated to provide the magnet type relief valve 7 with a valve opening state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas water heater having a device for pushing and opening a magnetic safety valve by hydraulic pressure.

[0002]

2. Description of the Related Art In general, a gas appliance is provided with a magnet type safety valve for stopping the outflow of gas when a combustion flame is inadvertently extinguished. The presence or absence of combustion flame during combustion is monitored by the thermoelectromotive force of the flame guard or thermocouple. If there is a combustion flame, the magnet safety valve is opened and held by the power of the dry battery (or thermoelectromotive force), and the combustion is performed. In the case of the disappearance of the flame, the energization is stopped (or the thermoelectromotive force is reduced), and the valve is closed by releasing the valve opening holding force. In order to set the valve to open at the time of ignition, it is necessary to have a pressing force for pressing against the suction surface of the magnetic safety valve and a pressing release for bringing the magnetic safety valve into a valve closeable state after the suction. It is known that the pushing force is based on human pressure or other electromagnetic force, as well as using water pressure.

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

[0004] A spindle 8 which moves forward and backward in accordance with the water flow pressure.
A valve opening device 80 for setting the magnet type safety valve 7 to open is provided at the tip of the valve 2. The valve opening device 80 includes a pusher 83 that pushes the magnetic 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. Evacuation spring 85 that disengages 84 from spindle 82 and retracts to bring magnetic safety valve 7 into a valve-closable state
And a ball 40 that fits into the concave portion 41 of the spindle 82 during the backward movement of the spindle 82 due to the stoppage of the water and locks the valve opening device 8 again.

When the water heater is started and water is supplied, a pushing force is generated in the water pressure responsive device 16 so that the water side shaft 14
, The spindle 82 overcomes the force of the spring 81 and moves forward together with the water side shaft 14. The valve-opening device 80 engages with the spindle 82 until the magnetic safety valve 7 is opened and suction is performed, moves forward integrally (to the left in the drawing), and pushes the magnetic safety valve 7 to open and press it. Is reached, the engagement with the spindle 82 is released, and the magnetic safety valve 7 slides on the spindle 82 to a position where the valve can be closed and moves backward (to the right in the drawing). Further, when the flow of water is stopped, the spindle 82 is returned to the initial stop position by the hydraulic pressure responsive device 16, and the valve opening device 80 and the spindle 82 are provided in such a relationship that the engagement is restored again.

[0006] As shown in FIG. 12, the valve opening device 80 stops at the stop position (A) when the spindle 82 moves forward.
In this state, the magnet type safety valve 7 is started to be pressed and the valve is opened. Further, the spindle 82 is provided with the magnetic safety valve 7.
Is pressed to the attraction surface of the electromagnet 47 (B).

Further, when the spindle 82 moves forward, the pushing force releases the engagement between the valve opening device 80 and the spindle 82, and the valve opening device 80 moves backward while sliding on the spindle 82, and the magnetic safety valve 7. (C). The release of the pushing force is performed by the ball 40 and the spindle 8.
This is due to the disengagement of the second engaging portion 41 with the concave portion 41. Further, when the spindle 82 moves forward to the left in the figure, the state shown in FIG. 3D is reached, and the automatic hydraulic valve 30 is pushed by the pushing member 29 integrated with the spindle 82 to open and the gas starts to flow.

When a fire extinguishing operation is performed by the operation button 18, the faucet 10 closes and stops water. Then, the hydraulic response device 16
In other words, the pressure difference between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6 disappears, and the force of the spring 81 starts returning the spindle 82 to the stop position (rightward in the figure). When the spindle 82 retreats and closes the return hydraulic pressure automatic valve 30 and then retreats 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). .

[0009]

However, the valve element 43 of the magnet type safety valve 7 is stuck 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 quickly due to high water pressure. When the magnetic safety valve 7 is pushed by impact, 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 magnetic safety valve 7 is sufficiently pushed. Therefore, there is a problem that the gas water heater does not ignite. This is because the absorption spring 84 of the valve opening device 8 is compressed by the pushing force only when the magnetic safety valve 7 reaches the valve opening start position, and the recess 4 of the spindle 82 is pressed.
This is because the valve opening device 80 releases the engagement with the spindle 82 and retreats before the ball 40 comes off from 1 and reaches the fully opened position of the magnetic safety valve 7.

In view of the above, the gas water heater of the present invention solves the above-mentioned problems, and requires a large pressing force at the start of valve opening due to the sticking of the valve element and the seat portion of the magnet type safety valve during the ignition operation. Another object of the present invention is to provide a gas water heater provided with a valve opening device for surely moving a magnetic safety valve to a fully open position.

[0011]

According to a first aspect of the present invention, there is provided a gas water heater comprising: a spindle which moves forward and backward in accordance with a water flow pressure;
A magnet-type safety valve that closes the gas flow path due to a decrease in the energizing current, interposed between the spindle and the magnet-type safety valve, and when the spindle moves forward due to water flow,
A transmission mechanism that transmits the pressing force from the spindle to push the magnet-type safety valve open, and that the spindle moves forward to open the magnet-type safety valve, and then releases the intervention by the transmission mechanism to release the magnet-type safety valve. A gas water heater comprising: a retracting mechanism for bringing the valve into a valve-closable state; and an automatic hydraulic valve that opens a gas flow path communicating with the magnet-type safety valve by further moving the spindle forward after the retracting mechanism operates. The retraction mechanism is a positioning mechanism that releases the intervention by the transmission mechanism and closes the magnetic safety valve only when the spindle moves forward and reaches the valve-opening completed position of the magnetic safety valve. The gist is that it is provided.

In the gas water heater according to the first aspect of the present invention having the above configuration, when water is supplied by the ignition operation, the spindle first moves forward, and at this time, a transmission mechanism is provided between the spindle and the magnetic safety valve. The pushing force from the spindle is transmitted to push the magnetic safety valve open. Only when the positioning mechanism reaches the valve-completion opening position of the magnetic safety valve, the retracting mechanism retracts the transmission mechanism and releases the intervention by the transmission mechanism to make the magnetic safety valve closeable. Therefore, the pushing force to the magnetic safety valve by the transmission mechanism is not released at the valve opening start position of the magnetic safety valve, but is always released after reaching the valve opening completion position. Even when the body is stuck to the seat portion of the main body, or when the spindle operates rapidly due to high water pressure and the magnetic safety valve is impacted, the magnetic safety valve can be reliably opened. Then, after the magnet type safety valve can be closed, the spindle further moves forward to open the automatic hydraulic valve. Therefore, the gas flow path can be reliably closed when the magnet type safety valve is abnormal after the start of combustion. Also, when water flow is stopped by the fire extinguishing operation, the spindle retreats and closes the water pressure automatic valve, and the spindle retreats further, and the transmission mechanism intervenes between the spindle and the pushing body by the reset mechanism, and the next ignition occurs. Prepare.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a gas water heater of the present invention will be described below. FIG. 1 is a schematic diagram of a gas water heater as one embodiment. This gas water heater is provided with a valve opening device 8 that pushes and opens the magnet type safety valve 7 by water pressure, and generates a pressure difference between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6 by flowing water to advance. A water pressure responsive device 16 for generating a pushing force on the diaphragm 6 that is free to retreat;
The above-described valve opening device 8 and the spindle 3 are provided at the distal end side of the spindle 37 which is moved forward by the hydraulic pressure response device 16.
7, an automatic hydraulic valve 30 for opening and closing the gas flow path is provided. Further, the automatic hydraulic valve 30 is provided with a return spring 27 that urges the spindle 37 in the retreating direction while urging in the valve closing direction. The gas supply path passes from the gas inlet to the main burner 50 via the magnet type safety valve 7, via the instrument plug 19 for opening and closing the gas flow path by the manually operated operation button 18, via the automatic hydraulic pressure gas valve 30. In addition, a flow path between the instrument plug 19 and the automatic hydraulic gas valve 30 is branched, and a flow path to a sensing burner 51 capable of detecting a combustion state and burning off with the main burner 50 is provided. The sensing burner 5 generates a thermoelectromotive force by heating a thermocouple (not shown), and when the interior of the room becomes an oxygen-deficient atmosphere due to the combustion exhaust gas, the combustion flame is lifted (split) before the main burner 50 is incompletely burned. And 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 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 the seat portion 35. The other end of the valve shaft 36 is provided with an attraction piece 46, which faces the attraction 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 and is provided on the distal end side of a spindle 37 that faces the magnet-type safety valve 7 and transmits the water pressure responsive device 16 to move forward. Can be Also, the valve opening device 8
Is composed of a cylindrical outer cylinder 3 fixed to the main body 2, an inner cylinder 4 slidably moving in the axial direction in the outer cylinder 3 as the spindle 37 advances and retracts, and an inner cylinder 4. And a pushing body 9 that pushes the magnet type safety valve 7 by the transmitted forward force.
Each of the contact portions of the outer cylinder 3, the inner cylinder 4, and the rotating body 5 is provided with four cam portions, which will be described later, all around.

FIG. 3 is an explanatory view schematically showing a plurality of cam portions. In addition, the outer cylinder 3 shown in the figure omits the outer cylinder, and shows only the rib provided on the inner peripheral surface. Four ribs 3a and four 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 around the axis is formed on the forward end surface of each of the ribs 3a. Is done. Four ribs 4a are formed on the outer peripheral surface of the inner cylindrical body 4 so as to fit into the respective grooves 3b in the outer cylindrical body 3, and the spline inclined in the same direction is also provided on the forward end surface of the rib 4a. The surface 4c is formed. The inner cylinder 4 is urged in the retreating direction by the spring 11 and is locked to the step 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 that fit into the respective grooves 3b of the outer cylindrical body 3, and forms a disk shape having a center hole 5d (FIG. 9). A spline surface 5c inclined in the same direction is formed on the retreat-side end surface of the arm 5a, and the spline surface 4c of the rib 4a of the inner cylinder 4 is formed.
The contact spring 15 is urged by the contact spring 15 in the retreating direction so as to face and contact with the contact c (FIG. 2).

A cylindrical pusher 9 having a contact surface with a magnet type safety valve 7 at one end is inserted into the center hole 5d of the rotating body 5 (FIG. 2), and the pusher 9 is connected to the magnet type safety valve. When the valve 7 is fully opened, an absorbing spring 18 which is compressed and absorbs an extra stroke is provided between the pushing body 9 and the rotating body 5, and the pushing body 9 is pulled out of the rotating body 5 by the force of the absorbing spring 18. The locking end 9 d of the pushing body 9 is locked around the center hole of the rotating body 5 so as not to be moved. A step 9c for locking the rotating body 5 is provided on the outer peripheral surface of the pushing body 9 inserted into the center hole 5d of the rotating body 5 so as not to be compressed by a predetermined dimension or more. When the valve body 43 of the magnetic safety valve 7 is fixed to the seat surface 35,
Even if the absorption spring 18 is compressed, the step portion 9c and the rotating body 5 are locked to break the fixation of the valve body 43 and open the magnet type safety valve 7.

Downstream of the valve opening device 8, there is provided an automatic hydraulic valve 30 slidably inserted through a spindle 37 (FIG. 1), and is urged by a return spring 27 so as to close in the downstream direction. The valve body 4 is brought into contact with and separated from the seat portion 39 of the
A second valve chamber 17 is formed in a section between the second valve chamber 17 and the second valve chamber 3. A push member 29 for opening the hydraulic automatic valve 30 is provided on the spindle 37.
The hydraulic automatic valve 30 is pushed by the pushing member 29 of the spindle 37 and opened after the rotor 5 of the valve opening device 8 is retracted after the opening of the magnetic safety valve 7 is completed. Can be

Next, each operation of the valve opening device 8 will be described. 5 to 11 are explanatory diagrams of the operation of the valve opening device 8 incorporated in the water heater. FIG. 4 shows the state of the cam portion in each operation. The pressing power is transmitted to the water shaft 14 of the water pressure responsive device 16 when the water heater is started to operate and water is passed. Therefore, the spindle 37 overcomes the force of the return spring 27 and moves forward together with the water-side shaft 14. The inner cylinder 4 of the valve opening device 8 moves forward together with the spindle 37 to be locked. (Fig. 5 → Fig. 6)
When the inner cylinder 4 of the valve-opening device 8 moves forward, the ribs 4a of the inner cylinder 4 move within the grooves 3b of the outer cylinder 3 to the arms 5 of the rotating body 5.
a, the forward force is transmitted to the spindle 37 → the inner cylinder 4 → the rotating body 5 → the pushing body 9 → the magnet type safety valve 7 ((a) → (b) → (c) in FIG. 4), and stops. Position (Fig. 5)
In this state, the magnet type safety valve 7 is started to be pressed to start valve opening. Further, the spindle 37 pushes the attraction piece 46 of the magnetic safety valve 7 to the attraction surface of the electromagnet 47 (FIG. 7).

When the magnet type safety valve 7 reaches the fully open position, the pushing body 9 cannot move forward, but the absorbing spring 18 provided between the rotating body 5 and the pushing body 9 is compressed, and the inner cylinder 4 is further moved. The rotating body 5 is moved ((d) in FIG. 4). Thereby, after reaching the valve opening completion position of the magnetic safety valve 7, the forward stroke by the pushing body 9 can be absorbed to protect the magnetic safety valve 7. When the arm of the rotating body 5 moves to a position beyond the upper end of the rib 3a of the outer cylinder 3, the rib 3a of the outer cylinder 3 cannot guide the arm 5a of the rotating body 5, and the rotating body 5 Rib 4 of outer cylinder 3
a, 3a, along the inclination of the spline surfaces 4c, 3c, retreats while rotating to a position where it abuts against the side surface of the rib 4a of the inner cylinder 4 that is adjacent in the rotation direction.
retreat on the spline surface 3c of FIG.
(F)) (FIG. 8). The retracted position of the rotating body 5 is adjusted so that the pushing body 9 is separated from the magnetic safety valve 7 so that the magnetic safety valve 7 can be closed.
It is set in advance by the inclination angles of c, 4c, and 5c. Therefore, when the rotating body 5 of the valve opening device 8 retreats and retracts, the magnet type safety valve 7 is brought into a valve closeable state (FIG. 8). Therefore, it is possible to reliably close the gas flow path when an abnormality occurs after the start of combustion.

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

Next, when the fire extinguishing operation is performed by the operation button 18, the faucet 10 is closed to stop the water. Then, the differential pressure between the primary chamber 20 and the secondary chamber 21 of the diaphragm 6 disappears, the force of the return spring 27 starts returning the spindle 37 to the stop position (to the right in FIG. 1), and the water pressure responsive device 16 The fourth rib 4a retreats in the groove 3b of the outer cylinder 3 (FIG. 4 (h)). The spindle 37 retreats and returns, and the water pressure automatic valve 3
0, the tip of the rib 4a of the inner cylinder 4 retreats to the lower end position of the arm 5a of the rotator 5, and the arm 5a of the rotator 5 is a side surface of the rib 3a of the outer cylinder 3 adjacent in the rotation direction. While rotating to a position where it comes into contact with the spline surface 4c of the rib 4a of the inner cylindrical body 4 (FIG. 4 (i)). That is, the rotating body 5 of the valve opening device 8, the arm 5a, and the rib 4a of the inner cylinder 4 come into contact again. Then, the rib 4a of the inner cylinder 4 is
b, the arm 5a of the rotating body 5 retreats in the groove 3b and returns to the initial stopped state ((j) in FIG. 4), and prepares for the next ignition (FIG. 5).

As described above, the gas water heater automatically opens the magnet type safety valve 7 using the water flow pressure, so that electric power for opening the magnet type safety valve 7 is not required. it can. In addition, since the automatic hydraulic pressure valve 30 is opened after the magnet type safety valve 7 is in a closeable state,
In the event of an abnormality after the start of combustion, the gas flow path can be reliably closed. Further, during the retreat of the spindle 37 due to the stoppage of the water supply of the gas water heater, the rotating body 5 is interposed again between the spindle 37 and the pushing body 9, so that the stop can be made in a state ready for the next re-ignition.

Further, the valve opening device 8 retracts the rotating body 5 after reaching the valve opening completion position of the magnetic safety valve 7 to make the magnetic safety valve 7 in a valve-closable state. That is, the pushing force of the pushing body 9 to the magnet type safety valve 7 is not released at the opening start position of the magnet type safety valve 7. Accordingly, the pushing force is released after the magnetic safety valve 7 reaches the valve-opening completion position, so that the valve element 43 of the magnetic safety valve 7 is stuck to the seat portion 35 or the spindle 37 operates quickly due to high water pressure. Thus, even when the magnetic safety valve 7 is pushed by impact, the magnetic 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 retreats and re-engages with the valve-opening device 80 which is locked after the fire is extinguished, the force of the absorbing spring 84 of the valve-opening device 80 causes the ball 40 to move. The spindle 8 is pressed into contact with the spindle 82.
2 had a large sliding resistance. On the other hand, in the present embodiment, the spline surface 4c of the inner cylinder 4 and the spline surface 5c of the rotating body 5 are opened simply by abutting without using the ball 40 which is pressed against the spindle 82 and slides. The valve device 8 is reset (FIG. 3). Therefore, the spindle 37
The sliding resistance caused by the retreat can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the spirit of the present invention. It is. For example, the stroke absorbing 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.

[0027]

As described in detail above, claim 1 of the present invention
According to the described gas water heater, the pushing force to the magnet type safety valve is released after reaching the valve opening completed position of the magnet type safety valve, so that the valve body of the magnet type safety valve sticks to the seat portion of the main body. Even if the spindle is operated rapidly due to high water pressure and the magnetic safety valve is impacted and pushed, the excellent effect that the magnetic safety valve can be reliably opened can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the valve opening device according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a cam portion of the valve opening device according to the embodiment of the present invention.

FIG. 4 is an operation explanatory view of a cam portion of the valve opening device according to the embodiment of the present invention.

FIG. 5 is an operation explanatory view of the valve opening device according to the embodiment of the present invention (stopped state).

FIG. 6 is an operation explanatory view of the valve opening device according to the embodiment of the present invention (valve opening start state).

FIG. 7 is an operation explanatory view of the valve opening device according to the embodiment of the present invention (fully opened state).

FIG. 8 is an explanatory diagram of the operation of the valve opening device according to the embodiment of the present invention (the pressing force released state).

FIG. 9 is an explanatory diagram of the operation of the valve opening device according to the embodiment of the present invention (the opening state of the automatic hydraulic valve).

FIG. 10 is an operation explanatory view of the valve opening device according to the embodiment of the present invention (combustion state).

FIG. 11 is an operation explanatory view of the valve opening device according to the embodiment of the present invention (reset state).

FIG. 12 is an operation explanatory view of a valve opening device according to a conventional example ((A) stop position).

FIG. 13 is an explanatory view of the operation of the valve opening device according to the conventional example ((B) full opening of the magnet type safety valve).

FIG. 14 is an explanatory view of an operation of the valve opening device according to the conventional example ((C) after the valve opening device is released).

FIG. 15 is an explanatory view of the operation of the valve-opening device according to the conventional example ((D) automatic opening of the hydraulic automatic valve fully (combustion state)).

[Explanation of symbols]

 Reference Signs List 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 water pressure response device 30 automatic water pressure valve 37 spindle

Claims (1)

[Claims] 1. A spindle which moves forward and backward in accordance with water flow pressure, a magnetic safety valve which is opened and held by an energizing current and closes a gas flow passage when the energizing current decreases, and interposed between the spindle and the magnetic safety valve. And
A transmission mechanism for transmitting a pushing force from the spindle to open the magnetic safety valve when the spindle is moved forward by water flow; and a transmission mechanism for moving the spindle forward to open the magnet safety valve after the spindle moves forward. A retraction mechanism that releases the intervention by the magnet-type safety valve so that the magnet-type safety valve can be closed; and a water-pressure automatic valve that opens the gas flow path communicating with the magnet-type safety valve by further moving the spindle forward after the retraction mechanism operates. In the gas water heater provided with, the retracting mechanism is provided only when the spindle moves forward and reaches the valve-opening completed position of the magnetic safety valve.
A gas water heater comprising a positioning mechanism that releases the intervention by the transmission mechanism and makes the magnet-type safety valve in a valve-closable state.