JPH0249476Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is an automatic water flow valve for an instantaneous water heater that is ignited by a spark plug each time the gas valve is opened by water supply and gas from the burner is released. Regarding.

[Prior art]

This type of instantaneous water heater saves gas because it does not require a constantly burning pilot flame, but it does so by reducing the amount of gas when igniting, igniting it gently, and then increasing the amount of gas to the required amount. Requires igniter.
In the technique shown in FIGS. 3 and 4, which are examples of this type of prior art, the passage from the gas source 10 is branched into a main passage 12 and a branch passage 13A after the original solenoid valve 15, and the main passage 12 is divided into a main passage 12 and a branch passage 13A. Burner 1 via main solenoid valve 17A, gas pressure governor 16A and automatic water flow valve 1
1, and the branch passage 13A joins the main passage 12 through the throttle 13a and the slow ignition solenoid valve 19A, and is connected to the burner 11. When water is supplied to the water supply passage 20 and the automatic water flow valve 1 is activated, first, only the slow ignition solenoid valve 19A is opened, the amount of gas from the burner 11 is reduced, the ignition plug 21 is ignited, and after a predetermined period of time, the main solenoid valve is opened. The valve 17A is opened to increase the amount of gas.

The automatic water flow valve 1 is equipped with an on-off valve 3 and a proportional valve 4 as shown in FIG.
As the amount of water flowing through the water supply passage 20 increases, the actuating rod 5 is pushed to the left by the diaphragm actuating device 18A (see Fig. 4), and when the amount of water flowing exceeds a predetermined value, the on-off valve 3 opens. When the proportional valve 4 is opened and the amount of water flowing further increases, the opening degree of the proportional valve 4 gradually increases, and the amount of gas supplied to the burner 11 is gradually increased. However, proportional valve 4 depending on the water flow rate
As shown in FIG. 4, the rear end of the branch passage 13A is equipped with an automatic water flow valve 1 and Position 14a of burner 11
It merged with the main passage 12 at.

[Problem that the invention attempts to solve]

However, in such conventional technology, when the instantaneous water heater is in a standby state with the control power turned on (in a state where the main solenoid valve 15 is open), the gas source 10
Since only the slow ignition solenoid valve 19A shuts off between the and burner 11, the slow ignition solenoid valve 19A
There was a problem in that if there was a leak in A, gas would immediately leak from the burner 11. The present invention solves these problems by improving the structure of the automatic water flow valve used in this type of instant water heater so that only the on-off valve of the automatic water flow valve can be interposed between the slow ignition solenoid valve and the burner. This is an attempt to solve the problem.

[Means for solving problems]

For this reason, the automatic water flow valve of the instantaneous water heater according to the present invention has an on-off valve 40 that opens the gas passage when the amount of water flowing through the water supply passage 20 exceeds a predetermined value, as shown in Figs. 1 and 2. In an automatic water flow valve 30 for an instantaneous water heater, which has a proportional valve 50 that gradually increases the opening degree of the gas passage in accordance with an increase in the amount of water flow, an inlet valve chamber 32 with a main gas inlet 32a opened and a gas inlet 33a for slow ignition. Central valve chamber 33 and gas outlet 3 with open
An outlet valve chamber 34 with opening 4a is continuously formed inside, and proportional valve seats are provided coaxially between the inlet valve chamber 32 and the central valve chamber 33 and between the central valve chamber 33 and the outlet valve chamber 34, respectively. 51 and on-off valve seat 41
A casing 31 is provided with an on-off valve 40.
An on-off valve seat 41 and an on-off valve body 4 which is provided coaxially with the on-off valve seat 41 and movable in the axial direction to open and close the on-off valve seat 41.
2, the proportional valve 50 is provided coaxially with a proportional valve seat 51 and is movable in the axial direction.
It consists of a proportional valve body 52 that continuously changes the opening area between the on-off valve body 42 and the proportional valve body 5.
2 in one direction to the closed position and the minimum opening, respectively, and a return spring 53 that abuts the on-off valve body 42 from the other direction and applies a force corresponding to the increase in water flow amount to resist the return spring 53. It is characterized by comprising an actuating rod 37 that displaces the opening/closing valve body 42 and the proportional valve body 52 in the other direction in response to the force. In the first embodiment, the opening/closing valve body 42 and the proportional valve body 52 are brought into contact with each other via an auxiliary spring 43.

[Effect]

When water is not flowing through the water supply passage 20 , the on-off valve 40 of the automatic water flow valve 30 is closed, and gas from the main gas inlet 32 a and the slow ignition gas inlet 33 a is blocked by the on-off valve 40 and the burner 11 is closed. is not supplied to. When water is flowing through the water supply passage 20, the on-off valve 40 opens and the opening degree of the proportional valve 50 changes depending on the amount of water flowing, but the gas from the slow ignition gas inlet 33a passes through the proportional valve 50. The gas from the main gas inlet 32a is supplied to the burner 11 from the gas outlet 34a, and the gas from the main gas inlet 32a is supplied to the burner 11 from the gas outlet 34a.
The gas outlet 34a is controlled according to the amount of water passing through the gas outlet 34a.
is supplied to the burner 11.

[Effect of idea]

As described above, according to the present invention, the gas from the slow ignition gas inlet that does not pass through the proportional valve 50 is also shut off by the on-off valve of the automatic water flow valve, so the slow ignition gas control valve ( For example, even if a leak occurs in the slow ignition solenoid valve 19), this on-off valve will prevent gas from leaking from the burner, and gas from the slow ignition gas inlet will be supplied to the burner without passing through the proportional valve. Even if the amount of water passing changes, the amount of gas at the time of ignition does not change, so there is no risk of ignition errors due to too little gas amount or explosive ignition due to too much gas amount. In addition, if the on-off valve body and the proportional valve body are made to face each other via an auxiliary spring, the on-off valve will be reliably closed by the auxiliary spring even if the proportional valve body gets caught in a foreign object and its movement is obstructed. This further prevents gas leakage.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG.
A slow ignition solenoid valve 19 is connected in parallel via a branch passage 13 to a main solenoid valve 17 provided in a main passage 12 that supplies gas to the burner 11. pressure governor 16
and connected to the gas source 10 via the original solenoid valve 15,
The main passage 12 downstream from the main solenoid valve 17 is connected to the burner 11 via an automatic water flow valve 30. The branch passage 13 is provided with a throttle 13a in series with the slow ignition solenoid valve 19 for supplying a relatively small amount of gas suitable for ignition to the burner 11, so that the resistance of the branch passage 13 is greater than the resistance of the main passage 12. becomes large.
As shown in FIGS. 1 and 2, the automatic water flow valve 30 is formed by connecting a proportional valve 50 on the upstream side and an on-off valve 40 on the downstream side in series, and the downstream end of the branch passage 13 is connected to the proportional valve 50.
0 and the main passage 12 at the middle part of the on-off valve 40.

The original solenoid valve 15, the main solenoid valve 17, and the slow ignition solenoid valve 19 are ordinary solenoid valves, and may be the same. The main solenoid valve 15 is opened when the control power of the instant water heater is turned on, and the main solenoid valve 17
The slow ignition solenoid valve 19 is controlled by an automatic water flow valve 30 via a control device (not shown), as described later. The gas pressure governor 16 has a diaphragm actuator 16a, one diaphragm chamber communicating with the upstream side of the gas pressure governor 16, and the other diaphragm chamber communicating with the atmosphere and provided with a spring. Then, as the gas pressure on the upstream side increases or decreases, the diaphragm is moved to the other side or one side to decrease or increase the opening degree of the gas pressure governor 16, thereby keeping the gas pressure on the downstream side constant.

Next, the structure of the automatic water flow valve 30, which is the main part of the present invention, will be explained. In Figure 2, casing 3
1 has a three-stage cylindrical inner hole 31a inside, and the end opening of the inner hole 31a is sealed by a closing member 35 which is caulked and fixed via a sealing plate 36.
The inner hole 31a of the casing 31 is formed continuously from the closing member 35 side, and includes an inlet valve chamber 32 with a main gas inlet 32a open, a central valve chamber 33 with a slow ignition gas inlet 33a open, and a gas outlet 34a. A proportional valve seat 51 having a central opening is located between the inlet valve chamber 32 and the central valve chamber 33.
is airtightly fitted and fixed coaxially with the inner hole 31a, and an opening/closing valve seat 41 is formed coaxially with the inner hole 31a between the central valve chamber 33 and the outlet valve chamber 34. As shown in Figure 1,
The main gas inlet 32a is connected to the gas source 10 via the main solenoid valve 17, etc., the slow ignition gas inlet 33a is connected to the slow ignition solenoid valve 19 of the branch passage 13 having a throttle 13a, and the gas outlet 34a is connected to the burner 11. Connect to.

Inside the inner hole 31a, an on-off valve body 42, which together with the on-off valve seat 41 constitutes the on-off valve 40, and a proportional valve body 52, which together with the proportional valve seat 51 constitutes the proportional valve 50, are arranged coaxially with both valve seats 41, 51. and is provided so as to be movable in the axial direction. The opening/closing valve body 42 is integrally provided with an annular sealing material 42a made of elastic rubber or the like at the contact portion with the opening/closing valve seat 41, and the outer periphery of the proportional valve body 52 facing the inner periphery of the central opening of the proportional valve seat 51. It has a conical surface. The opening/closing valve body 42 and the proportional valve body 52 overlap each other coaxially so that they can approach and separate, such that the latter 52 is on the closing member 35 side, and the proportional valve body 52 and the closing member 35
A return spring 53 is interposed between the two valve bodies 42,
52 are brought into contact with each other, and the seal member 42a of the on-off valve body 42 is brought into contact with the on-off valve seat 41, and in this state, the opening area between the proportional valve body 52 and the proportional valve seat 51 is minimized. Both valve bodies 42, 52
An auxiliary spring 43 having a smaller spring force than the return spring 53 is interposed in between, and a guide rod 54 fixed to the center of the proportional valve body 52 is supported by the closing member 35 so as to be able to reciprocate.

The tip of the actuating rod 37, which is provided coaxially with the outlet valve chamber 34 and slidable in the axial direction, is brought into contact with the center of the opening/closing valve element 42 from the opposite side of the proportional valve element 52, and the other end is brought into contact with the center of the opening/closing valve element 42 from the opposite side of the proportional valve element 52. (see Figure 2). The diaphragm chamber on one side of the diaphragm 18a is communicated with a bench lily 20a provided in the water supply passage 20 of the instant water heater, and the diaphragm chamber on the other side is communicated with the upstream side of the bench lily 20a. Water supply passage 20
When water is not flowing through the actuating rod 3.
Since no operating force is applied to valve 7, as shown in FIG. 1, the on-off valve 40 of the automatic water flow valve 30 is closed, and the proportional valve 50 is at its minimum opening. However, when the amount of water flowing through the water supply passage 20 exceeds a predetermined value, the negative pressure generated in the bench lily 20a applies an operating force to the actuating rod 37 via the diaphragm 18a, and the on-off valve 40 moves to the left against the return spring 53. The opening degree of the proportional valve 50 increases as the water flow increases. Note that the automatic water flow valve 30 is a switch (not shown) that is turned on and off simultaneously with the opening and closing of the on-off valve 40.
This switch controls the opening and closing of the main solenoid valve 17 and the slow ignition solenoid valve 19 via a control device (not shown). That is, both electromagnetic valves 17,1
9 are normally closed, and when the switch is turned on, the slow ignition solenoid valve 19 immediately opens, but the main solenoid valve 17 remains closed, and when the time required for ignition has elapsed, the timer starts. (not shown) opens the main solenoid valve 17 and returns the slow ignition solenoid valve 19 to close.

When the control power of this instantaneous water heater is turned on, the hot water tap is opened and water is passed through the water supply passage 20, the diaphragm operating device 18 operates the on/off valve 40 of the automatic water flow valve 30.
is opened, and the proportional valve 50 has an opening degree according to the amount of water flowing. At the same time, the slow ignition solenoid valve 19 opens,
Gas from the gas source 10 is supplied to the burner 11 via the solenoid valve 15, the gas pressure governor 16, the throttle 13a, the slow ignition solenoid valve 19, the slow ignition gas inlet 33a of the automatic water flow valve 30, and the on-off valve 40. , an igniter (not shown) is activated and a spark is generated at the ignition plug 21. In this state, the supplied gas passes through the throttle 13a and does not pass through the proportional valve 50, so the amount of gas released from the burner 11 is a relatively small amount suitable for ignition, and will not fluctuate due to the amount of water flowing. do not have. Therefore, the gas from the burner 11 is reliably and gently ignited by the spark from the ignition plug 21.

When the preset time required for ignition has elapsed, the timer opens the main solenoid valve 17 and closes the slow ignition solenoid valve 19, so that the gas from the gas source 10 is transferred to the original solenoid valve 15, the gas pressure governor 16, and the main solenoid valve 17. The main gas inlet 32a of the automatic water flow valve 30 from the solenoid valve 17,
It is supplied to the burner 11 via the proportional valve 50 and the on-off valve 40. In this state, the supplied gas passes through the proportional valve 50, so it increases or decreases depending on the amount of water flowing, and hot water at a predetermined temperature is supplied even if the amount of water flowing through the hot water tap is changed. When the hot water tap is closed, water flow to the water supply passage 20 is stopped, the on-off valve 40 of the automatic water flow valve 30 is closed, and at the same time the main solenoid valve 17 is closed (the slow ignition solenoid valve 19 remains closed). , the burner whose gas supply is stopped goes out.

Furthermore, if the opening/closing valve element 42 and the proportional valve element 52 are separated and an auxiliary spring 43, which is weaker than the return spring 53, is interposed between them, foreign matter may get caught between the proportional valve seat 51 and the proportional valve element 52, and the proportional valve Even if the movement of the body 52 is hindered, the opening/closing valve body 42 is moved away from the proportional valve body 52 by the auxiliary spring 43 and comes into contact with the opening/closing valve seat 41, thereby making it possible to further ensure gas shutoff.

Further, in this embodiment, the switching from the slow ignition solenoid valve 19 to the main solenoid valve 17 is performed by a timer, but the flame of the burner 11 is detected by the flame rod heated by the burner 11, and both the solenoid valves 17, 17 are switched. It is also possible to switch between the two questions.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a longitudinal cross-sectional view of an automatic water flow valve, FIG. 2 is an explanatory diagram of the entire instantaneous water heater, and FIGS. 3 and 4 are views corresponding to FIGS. 1 and 2 of the prior art, respectively. Explanation of symbols, 20...Water supply passage, 30...Automatic water flow valve, 31...Casing, 32...Inlet valve chamber, 32a...Main gas inlet, 33...Central valve chamber,
33a... gas inlet for slow ignition, 34... outlet valve chamber, 34a... gas outlet, 37... operating rod,
40... Opening/closing valve, 41... Opening/closing valve seat, 42... Opening/closing valve body, 43... Auxiliary spring, 50... Proportional valve, 5
1... Proportional valve seat, 52... Proportional valve body, 53... Return spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An on-off valve that opens the gas passage when the amount of water passing through the water supply passage exceeds a predetermined value, and a proportional valve that gradually increases the degree of opening of the gas passage in accordance with the increase in the amount of water passing through the water supply passage. In an automatic water flow valve for an instantaneous water heater, an inlet valve chamber with a main gas inlet open, a central valve chamber with a slow ignition gas inlet open, and an outlet valve chamber with a gas outlet open are continuously formed inside. A casing is provided between the inlet valve chamber and the central valve chamber and between the central valve chamber and the outlet valve chamber, in which a proportional valve seat and an on-off valve seat are provided coaxially with each other, and the on-off valve is connected to the on-off valve seat. The proportional valve is provided coaxially with the proportional valve seat so as to be movable in the axial direction and opens and closes the same opening/closing valve seat. a proportional valve body that continuously changes the opening area between the open/close valve body, and a return spring that biases the open/close valve body and the proportional valve body in one direction to the closed position and minimum opening, respectively; an actuating rod that comes into contact with the valve body from the other direction and applies a force corresponding to the increase in the amount of water flowing, resisting the return spring and displacing the opening/closing valve body and the proportional valve body in the other direction in accordance with the force; Automatic water flow valve for instant water heater. (2) An automatic water flow valve for an instantaneous water heater according to claim 1 of the utility model registration claim, which comprises an on-off valve body and a proportional valve body that are brought into contact with each other via an auxiliary spring.