JPH0749161Y2 - Opening device for electromagnetic safety valve in water heater - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a valve opening device for an electromagnetic safety valve in a water heater which opens the electromagnetic safety valve by using water pressure.

[Conventional technology]

In an instantaneous gas water heater, etc., as a means for opening the electromagnetic safety valve of the electromagnetic safety valve device, conventionally, a method of directly transmitting the force of a person or a method of pushing open by a force of a solenoid or the like is generally adopted. Examples of those that open by the force of a solenoid or the like include, for example, actual development No. 62-8550 and actual development 59-120344.
As shown in Japanese Patent Publication Nos. 59-18152 and 60-43849, a push-type solenoid is used that opens the electromagnetic safety valve by pushing the solenoid by activating the solenoid. What was there, and 63-126
As disclosed in Japanese Patent No. 755, there is one that pushes an electromagnetic safety valve open by a motor with a speed reducer.

[Problems to be solved by the device]

In the conventional technology that pushes open with a force such as a solenoid, the cost is increased because the solenoid or motor is expensive, and these require a power source for driving the valve to be structurally complicated. Moreover, there is a problem that the size becomes large.

This invention is applied to a water heater, and in which the electromagnetic safety valve is automatically opened by utilizing the water flow pressure, a water heater for the purpose of solving such problems of the conventional technology It is intended to provide a valve opening device for an electromagnetic safety valve.

[Means for Solving the Problems]

In order to achieve the above object, a valve opening device for an electromagnetic safety valve in a water heater according to the present invention is an electromagnetic valve provided in a gas flow path, which is provided with a reaction shaft that moves forward and backward according to the pressure of water passing through the water heater. A valve opening device for opening a safety valve, wherein a pusher body for pushing the electromagnetic safety valve is provided at the tip of the response shaft, and when the response shaft is moved forward in the electromagnetic safety valve opening direction by passing water through the water heater. , A lock maintaining mechanism that maintains the locked state between the responding shaft and the pusher, and after completion of opening the electromagnetic safety valve by advancing the responding shaft, the forward force is used to unlock the responder shaft and the pusher. Main features include a lock release mechanism that allows the safety valve to be closed, and a reset mechanism that locks the response shaft and pusher again while the response shaft is retracting due to the stop of water flow in the water heater. And

The lock release mechanism is provided with a retracting mechanism that retracts the pusher from the closed position of the electromagnetic safety valve when the lock between the response shaft and the pusher is released.

Further, a solenoid valve safety valve opening device for a water heater that opens an electromagnetic safety valve provided in a gas flow path by a response shaft that interlocks with a diaphragm of a water pressure response device provided in a water flow path of the water heater. , The inner cylindrical body and the outer cylindrical body are inserted into the distal end portion of the reaction shaft so that the positional relationship in the axial direction is displaceable, and the spring, the inner cylindrical body, and the outer cylinder mounted between the reaction shaft and the inner cylindrical body. A pusher body composed of an inner cylinder body and an outer cylinder body configured to be biased in a separating direction by a spring mounted between the bodies is provided, and the reaction shaft and the pusher body are connected to each other by the forward force and the backward force of the reaction shaft. Due to the displacement of the positional relationship between the inner cylinder and the outer cylinder caused by the lock, these locks and unlocks are automatically performed in series, and the outer cylinder of the pusher is opened by the electromagnetic safety valve. After that, it is provided so that the forward movement is blocked, and after the forward movement of the outer cylindrical body is blocked, only the response shaft and the inner cylindrical body are provided. Is further advanced in the locked state, the lock between the response shaft and the inner cylinder is released by the locking device, and the pusher is retracted from the closed position of the electromagnetic safety valve by the stroke between the response shaft and the inner cylinder. It is also characterized by being installed in the.

[Action]

In the valve opening device of the electromagnetic safety valve in the water heater of the present invention having the above configuration, when water is passed through the water heater, the responding shaft provided with the pusher at the tip advances in the valve opening direction of the electromagnetic safety valve. At this time, since the pusher is locked by the lock maintaining mechanism with the responding shaft, the pusher pushes the electromagnetic safety valve open. When the electromagnetic safety valve is completely opened, the unlocking mechanism unlocks the electromagnetic safety valve by using the forward force of the response shaft to unlock the response shaft and the pusher. In other words, after opening the electromagnetic safety valve, the valve opening force to the electromagnetic safety valve is released to protect the electromagnetic safety valve, and the valve can be closed so that the gas flow path can be reliably closed in the event of an abnormality. .

When the water flow in the water heater stops, the response shaft moves backward. During this retreat, the response shaft and the pusher are locked again by the reset mechanism, and the electromagnetic safety valve is prepared for opening next time the water is passed.

According to the second aspect of the invention, when the lock release mechanism unlocks the response shaft and the pusher, the retracting mechanism retracts the pusher from the closed position of the electromagnetic safety valve. Therefore, in the event of an abnormality, the electromagnetic safety valve can be closed without touching the pusher, and the valve can be closed more smoothly.

According to the third aspect of the invention, the response shaft moves forward in synchronism with the movement of the diaphragm of the water pressure response device that is pushed by the water flow pressure by the hot water discharge operation, so that the response shaft and the locking device are locked and integrated. The pusher connected thereto also moves, and the pusher pushes the electromagnetic safety valve together with the attracting piece to separate the electromagnetic safety valve from its valve seat and open the attracting piece against the attracting surface of the electromagnet. When the opening of the electromagnetic safety valve and the pressing of the adsorption piece are completed, the movement of the outer cylinder of the pusher is blocked, and thereafter only the reaction shaft and the inner cylinder of the pusher are between the outer cylinder and the inner cylinder. The spring is compressed and continuously advanced, the positional relationship between the inner cylinder and the outer cylinder is displaced, the lock by the lock device is released, and the locked state between the response shaft and the pusher is released.
(At the time of this lock release, the suction release hold by the electromagnet of the electromagnetic safety valve is completed). After that, when the lock is released, the pusher retracts due to the ridge between the response shaft and the inner cylinder, and the push-holding of the electromagnetic safety valve is released by the pusher, and at the same time the pusher is retracted from the closed position of the electromagnetic safety valve. Do not interfere with the automatic closing of the.

Next, when the tapping operation is stopped, the pressing of the diaphragm by the water flow pressure is released, so the response shaft moves backward together with the diaphragm, and the positional relationship between the inner cylinder body and the outer cylinder body of the pusher body is displaced and returns to the original position. Therefore, since the response shaft and the pusher are locked and reset by the lock device during the backward movement, the response shaft and the pusher are integrally returned to the original position to prepare for the next tapping operation.

〔Example〕

An embodiment of an electromagnetic safety valve opening device for a water heater according to the present invention will be described below with reference to the drawings.

In the drawing, A is a water pressure responsive device provided in the middle of the water flow passage 5 to the heat exchanger, and is a spring for returning the diaphragm chamber 4 to return.
The diaphragm 1 biased toward the primary chamber 4a at 10 divides it into a primary chamber 4a and a secondary chamber 4b, and a diaphragm type water supply valve V is provided in a water passage 5 upstream of the primary chamber 4a of the diaphragm chamber 4. When the pilot valve 6 of the diaphragm type water supply valve V is opened by separating from the valve hole 7a of the diaphragm valve 7 and the valve hole 7a, the water pressure in the diaphragm valve chamber 8 decreases and the diaphragm valve 7 separates from its valve seat 9. Therefore, the water from the upstream side 5a of the water flow passage 5 flows from the diaphragm water supply valve V through the water governor valve V ₃ to the wake of the water flow passage 5 through the primary chamber 4a of the diaphragm chamber 4 of the water pressure response device A. It is designed to flow to side 5b.

Reference numeral 2 denotes a reaction shaft, the base end portion of which is fixed to the secondary chamber 4b side of the diaphragm 1, and the tip end portion of which is inserted into a valve chamber 12 provided in a gas flow passage 11 to the main gas burner and is axially installed. The response shaft 2
Is configured to respond to the water flow pressure by linearly advancing and retreating in conjunction with the diaphragm 1.

C is a pusher provided on the tip side of the response shaft 2, and is an inner cylinder 15
And a outer cylindrical body 16, and an inner cylindrical body 15 is loosely fitted on the reaction shaft 2 so as to be freely slidable in the axial direction, and is fixed to the tip end side of the inner cylindrical body 15 and the reaction shaft 2 by a spring receiver. A biasing force is applied to the inner cylinder body 15 in the axial base end side direction (rightward in the drawing) by the return spring 14 mounted between the inner cylinder body 15 and the base end of the outer cylinder body 16. Side is slidably inserted so that the positional relationship in the axial direction can be displaced, and the locking projection 17 formed on the inner cylinder 15 has an outer cylinder.
The inner cylinder 15 and the outer cylinder 16 are positioned by keeping contact with the locking portion 18 formed on the outer cylinder 16 and locking the inner cylindrical body 15 and the outer cylindrical body 16 to be most separated from each other when they are locked by the locking device B described later. The inner cylinder body 15 and the outer cylinder body 16 are connected to the response shaft 2 via the lock device B.

A pusher body 19 slidably supported by the tip end of the response shaft 2 is integrally fitted and fixed to the tip end side of the outer cylindrical body 16, and
On the outer edge of the distal end of the outer cylindrical body 16, there is provided a locking brim 22 for restricting the retracted position of the outer cylindrical body 16 by abuttingly locking a plurality of gas through holes 20 with a stopper 21 formed in the peripheral edge. A spring receiving step portion 23 of the cylindrical body 16 and a spring receiving plate fixed to the base end of the inner cylindrical body 15.
The absorbing sleeve 25 is attached between the inner cylinder 15 and the outer cylinder 25.
The structure is such that 16 is biased in the direction in which they are separated from each other due to the spring force of the return spring 14.

B is to lock the reaction shaft 2 and pusher C (inner cylinder 15 and outer cylinder 16) integrally to maintain the locked state, or to release the lock to release the locked state. The lock device for releasing the lock and allowing the separate movements thereof, and also for integrally resetting the responding shaft 2 and the pusher body C again while the responding shaft 2 is retracting to the original position. Is loosely movable in the radial direction in the ball receiving hole 26 provided in the inner cylindrical body 15 while restricting the movement in the axial direction and loosely fitted, and the spherical body 27 is moved in the radial direction and pierced in the response shaft 2. The lock recessed groove 28 or the lock step portion 29 provided on the outer cylinder body 16 is engaged and disengaged, and the inner cylinder body 15 and the outer cylinder body 16 are separated from each other by the elastic force of the return spring 14 and the absorption spring 25. When the locking projection 17 of the inner tubular body 15 is locked by the locking portion 18 of the outer tubular body 16 by receiving the biasing force in the direction, Lock groove 28 of drive shaft 2
And the inner peripheral surface portion 29a of the minimum inner diameter on the base end side of the outer cylindrical body 16 and the ball receiving hole 2
Keep the positional relationship with 6 and lock groove 2 of response shaft 2
By locking the sphere 27 to 8 and holding the outer surface side of the sphere 27 by the inner peripheral surface portion 29a, the inner cylinder body 15 and the outer cylinder body 16 are locked integrally with the response shaft 2 through the sphere body 27 (see FIG. Further, the inner tubular body 15 moves forward against the biasing force of the absorbing spring 25 together with the response shaft 2 and the lock step portion 29 of the outer tubular body 16 appears.
At a position where the sphere 27 and the ball receiving hole 26 of the inner cylindrical body 15 coincide with each other, the sphere 27 escapes from the lock groove 28 and moves to the lock step portion 29 side, and the inner surface side of the sphere 27 is held by the outer surface of the response shaft 2. The locking of the reaction shaft 2 and the inner cylinder body 15 by the sphere 27 is released (see FIGS. 4 to 6 and FIG. 7B), and the reaction shaft 2, the inner cylinder body 15, and the outer cylinder body 16 move separately. This structure is possible, and in the embodiment, a locking device is provided in which spheres 27 are arranged at equal intervals at four points on the peripheral surface. It goes without saying that the lock device B is not limited to the above structure.

MV is an electromagnetic safety valve device, which is a valve chamber 30 provided with an electromagnetic safety valve V ₁ provided at one end of the valve shaft 3 on the upstream side of the valve chamber 12 of the gas passage 11.
Is installed inside the valve shaft 3 so that the electromagnetic safety valve V ₁ is urged by the spring 31 in the closing direction to come in contact with and separate from the valve seat 32.
Of the electromagnetic safety valve device MV has a structure in which a suction piece 33 is provided at the other end of the electromagnet M so as to come in contact with and separate from the suction surface 34 of the electromagnet M. It is arranged on the same axis line with a slight gap b with the push body 19 of No. 2 and is configured such that the push body 19 of the push body C pushes the valve shaft 3 of the electromagnetic safety valve device MV when the valve is opened.

The spring load F ₀ at the time of setting the absorbing spring 25 mounted between the inner cylindrical body 15 and the outer cylindrical body 16, and the spring of the electromagnetic safety valve device MV.
The spring load f ₀ at the time of setting 31 is F ₀ > where the spring constant of the spring 31 is k and the gap between the suction piece 33 and the suction surface 34 is d.
f ₀ + k × d.

In addition, V ₂ is a hydraulic automatic gas valve, which is slidably fitted to the base end side of the response shaft 2 and is provided in the valve chamber 12 of the gas flow passage 11 and is integrated with the hydraulic automatic gas valve V ₂ . A pressing plate 37 fixed to the valve seat 36 by being biased and held in the closing direction by a spring 35 mounted between the spring receiver 38 and the stopper 21 so as to be contactable with and separable from the valve seat 36. Has a certain play a between them and is pushed by the pressing plate 37 in the opening direction so as to be interlocked with the reaction shaft 2 with a certain play a. 39 is a gas inlet, 40 is a gas outlet, and 41 is a lead wire.

In the above structure, the diaphragm 1 of the water pressure responding device A is moved to the left in the figure by the water flow pressure in the primary chamber 4a of the water flowing from the front flow side 5a to the back flow side 5b toward the heat exchanger during the hot water discharge. When it is pushed against the return spring 10 (see the chain line in FIG. 1), the response shaft 2 which is integrally provided with the diaphragm 1 is synchronized with the diaphragm 1 and moves to the left in the figure for a certain stroke. Advance. Therefore, in the initial stage of movement of the response shaft 2, the response shaft 2 and the pusher C are integrally coupled by the lock device B to maintain the locked state. That is, the inner cylindrical body 15 and the outer cylindrical body 16 of the valve-opening pusher C move the locking projection 17 of the inner cylindrical body 15 to the outside by the urging force in the separating direction due to the combined force of the loads of the return spring 14 and the absorbing spring 25. The sphere 27 of the lock device B is held in the most separated positional relationship in which it is locked by the locking portion 18 of the cylindrical body 16.
Is fitted into the lock groove 28 of the response shaft 2, and the outer surface side thereof is held by the base end inner peripheral surface portion 29a of the outer cylindrical body 16 and is held so as not to rattle. Therefore, the response shaft 2 and the inner cylindrical body 15 And are integrally connected by the wedge action of the spherical body 27,
Since 16 is kept separated from the inner cylindrical body 15 through the absorption spring 25 and these locked states are maintained, the response shaft 2 and the pusher body C integrally move forward together, and the pusher body of the pusher body C is pushed forward. When a stroke corresponding to the gap b between the valve safety valve device MV and the valve shaft 3 of the electromagnetic safety valve device MV is advanced, the pusher member 19 of the pusher member C that cooperates with the responding shaft 2 comes into contact with the valve shaft 3 of the electromagnetic safety valve device MV. Pushes the valve shaft 3 to the left in the figure to move the electromagnetic safety valve V ₁ to its valve seat 32.
When opened by a stroke corresponding to the gap d between the attraction surface 34 of the electromagnet M and the attraction piece 33 of the electromagnetic safety valve device MV, the attraction piece 33 is pressed against the attraction surface 34 of the electromagnet M (see FIG. 2). See the state of FIG. 3 from the state).

When the attraction piece 33 is pressed against the attraction surface 34 of the electromagnet M at the same time as the opening of the electromagnetic safety valve V _1, the outer cylinder body 16 is prevented from advancing to the left in the figure, and thereafter, the reaction shaft 2 and Inner cylinder
Only 15 are joined by the sphere 27 of the locking device B and continue to advance. At this time, the pressing force is absorbed by the absorbing spring 25, so that the valve shaft 3 of the electromagnetic safety valve device MV is not subjected to an unnecessary pressing force, that is, a pressing force higher than the biasing force of the spring 25. Response axis 2
When the spherical body 27 of the lock device B reaches the position of the lock step portion 29 of the outer cylindrical body 16 due to the forward movement of the inner cylindrical body 15 and the outer peripheral surface of the spherical body 27 by the base end inner peripheral surface portion 29a of the outer cylindrical body 16. Since the holding on the side is released, the spherical body 27 is pushed out of the lock concave groove 28 and comes out and is fitted into the lock step portion 29 of the outer cylindrical body 16 and the lock by the spherical body 27 is released (see FIG. 4). At the time of unlocking, normally, the suction release holding by the electromagnet M of the electromagnetic safety valve V ₁ is completed.

Then, the play a between the response shaft 2 and the hydraulic automatic gas valve V ₂ disappears, and the pressing plate 37 provided on the response shaft ₂ is locked to the hydraulic automatic gas valve V ₂ .

By releasing the lock, the response shaft 2, the inner cylindrical body 15 and the outer cylindrical body 16
Therefore, when the lock is released, the outer cylindrical body 16 is locked to the right in the figure together with the inner cylindrical body 15 via the spherical body 27 by the elastic force of the return spring 14 in the compressed state. The collar 22 is retracted until it is locked by the stopper 21, and is retracted so as not to interfere with the closing operation of the electromagnetic safety valve V ₁ due to non-ignition or blowout of the main gas burner (see FIGS. 5 and 7B). That is, the pusher C is retracted to a position where the pusher 19 does not collide even if the electromagnetic safety valve V ₁ is closed.

On the other hand, since the reaction shaft 2 continues to move forward, the hydraulic automatic gas valve V ₂ is integrally connected to the reaction shaft 2 by the pressing plate 37 and moves to the left side in the drawing together with the reaction shaft 2 against the spring 35 to move its valve seat. It is pushed apart from 36 and opened (see Fig. 6). Therefore, the gas from the gas inlet 39 is supplied to the main gas burner (not shown) via the path of the valve chamber 30, the valve seat 32, the gas passage hole 20, the valve chamber 12, the valve seat 36, and the gas outlet 40, and the main gas burner is ignited and burned. It is used for hot water.

Next, when hot water is stopped, that is, when the pilot valve 6 of the diaphragm-type water supply valve V is closed, the water flowing through the water passage 5 toward the heat exchanger is stopped and the diaphragm 1 is moved to the left side in the figure due to the water passage pressure. Since the pressing force is released and the diaphragm 1 is moved to the right in the figure by the elastic force of the return spring 10 and returns to the original position, the response shaft 2 integrated with the diaphragm 1 is also retracted to the right in the figure. Therefore, first, the hydraulic automatic gas valve V ₂ cooperates with the urging force of the spring 35 in cooperation with the response shaft 2 and comes into contact with the valve seat 36 to close the valve seat 36, so that the gas to the main gas burner is cut off and the main gas burner extinguishes. After that, when the lock groove 28 of the response shaft 2 reaches the position of the sphere 27 of the lock device B while the response shaft 2 is further retracted by the play a, the sphere 27
When the inner cylindrical body 15 is moved to the right in the figure, it is raised to the base end inner peripheral surface portion 29a of the outer cylindrical body 16 and fitted into the lock groove 28, and its outer surface side is held by the inner peripheral surface portion 29a. 2 and the inner cylindrical body 15 and the outer cylindrical body 16 are locked and reset by the spherical body 27, and at the same time, the return spring 14 is put into a compressed state and returned to the original position shown in FIG. 2 to prepare for the next tapping operation. is there.
Incidentally, in the water heater using the valve opening device of the above configuration,
Ignition of the main gas burner, such as direct ignition by quick start, can be performed reliably and stably. Moreover, you may use for what is called a front stop type water heater which opens and closes a water channel with a hot water supply curran.

[Effect of device]

As described above, this invention has a structure in which the electromagnetic safety valve is automatically opened by using the water flow pressure to the heat exchanger. It becomes cheap. Further, even in a water heater using a battery for combustion control, the power consumption can be suppressed, and the inconvenience of battery replacement can be reduced.

In addition, a lock device is provided between the pusher and the response shaft to maintain the lock when the electromagnetic safety valve is opened, and after the valve is opened, the lock is released to retract the pusher and move the solenoid safety valve to the closed position. It is configured to allow movements and to lock and reset them when water flow is stopped, and absorb the pushing force of the reaction shaft, so the gas is always shut off by the electromagnetic safety valve at the time of misfire or blowout. It can be done reliably, and since the adsorption piece integrated with the electromagnetic safety valve is not pressed against the electromagnet more than necessary, that is, more than the urging force of the spring, there is no failure or erroneous operation, and safety and durability are significantly improved. Also, the structure can be simplified and the device can be made compact.

[Brief description of drawings]

The drawings show an embodiment of a valve opening device for an electromagnetic safety valve in a water heater according to the present invention. Fig. 1 is an overall sectional view of the valve closed state, and Figs. 2 and 3 are states when the valve is opened. FIG. 4 to FIG. 6 are enlarged cross-sectional views of only the main part of FIG. 6, which are half-sectional views showing the main part of the hydraulic automatic gas valve when unlocked, retracted, and when the hydraulic automatic gas valve is opened. , B is a partially enlarged cross-sectional view of only the lock device, and Fig. 8A and B are XX in Fig. 2.
It is an expanded sectional view of a line. A: Water pressure response device, 1 ... Diaphragm, 2 ... Response shaft, 15 ... Inner cylinder, 16 ... Outer cylinder, B ... Lock device,
MV ...... electromagnetic safety valve, V ₁ ...... electromagnetic safety valve, C ...... pushers, 14 ...... return power spring, 25 ...... absorption power spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 55-171857 (JP, U) Rikai Sho 55-54756 (JP, U) Japanese Patent Sho 47-25007 (JP, B1) Japanese Public Sho 46- 24107 (JP, B1) Actual public Sho 47-28293 (JP, Y1)

Claims (3)

[Scope of utility model registration request] 1. A valve opening device for opening an electromagnetic safety valve provided in a gas flow path by means of a response shaft that moves back and forth according to the pressure of water passing through a water heater. And a lock maintaining mechanism for maintaining a locked state between the responding shaft and the pushing body when the responding shaft is moved forward in the electromagnetic safety valve opening direction due to the passage of water through the water heater, After completing the opening of the electromagnetic safety valve by the forward movement of the response shaft, the lock release mechanism that unlocks the electromagnetic safety valve by using the forward force to unlock the electromagnetic safety valve, and the water heater A valve opening device for an electromagnetic safety valve in a water heater, comprising: a reset mechanism that locks the response shaft and the pusher again while the response shaft is retracting due to the stop of water flow. 2. A retracting mechanism for retracting the pushing body from the closed position of the electromagnetic safety valve when the lock release mechanism unlocks the responding shaft and the pushing body. 1. A valve opening device for an electromagnetic safety valve in a water heater according to 1. 3. A valve opening device for an electromagnetic safety valve in a water heater, which opens an electromagnetic safety valve provided in a gas flow passage by a response shaft that interlocks with a diaphragm of a water pressure response device provided in a water passage of the water heater. The inner cylindrical body and the outer cylindrical body are inserted into the distal end portion of the response shaft such that the positional relationship in the axial direction is displaceable, and the spring and the inner cylindrical body mounted between the response shaft and the inner cylindrical body. A pusher composed of an inner cylinder and an outer cylinder, which are urged in a separating direction by a spring mounted between the outer cylinder and the outer cylinder, is provided. And the reciprocating force cause the inner cylinder and the outer cylinder to move relative to each other through a locking device that automatically locks and unlocks these cylinders, and the outer cylinder of the pusher is an electromagnetic safety valve. The valve is installed so that its forward movement is blocked after the valve is opened.After the forward movement of the outer cylinder is blocked, the reaction shaft and the inner cylinder are When only the body is further advanced in the locked state, the lock between the response shaft and the inner cylinder is released, and the pusher is retracted from the closed position of the electromagnetic safety valve by the spring between the response shaft and the inner cylinder. The valve opening device for an electromagnetic safety valve in a water heater according to claim 1 or 2, wherein the opening device is an electromagnetic safety valve.