JPS62142955A - Gas tap-controlled type water heater - Google Patents

Abstract

PURPOSE:To remove water hammering when a stop valve of a tap-controlled type water heater and reduce after heating by providing a rotational position detecting switch at the rotational portion of a motor, and slowly carrying out the opening and closing of the stop valve. CONSTITUTION:In this gas tap-controlled type water heater, after lapse of 1-2sec from the shut-off of gas, a stop valve shaft driving motor 26 rotates reversely. By the rotation of a gear 27 directly connected to the motor 26, a gear 30 rotates and a stop valve 35 is closed by the hydraulic pressure and a force of a spring 37, thus stopping the flow of water. When the motor 26 reaches a predetermined rotational angle, the cam portion 27a of the gear 27 pushes the lever of a rotational position detecting closing limiter 28 to stop the rotation of a motor. Simultaneously, a cam portion 27b of the gear 27 gets away from an opening limiter 29. After stopping the gas in this manner, water is stopped after lapse of 1-2sec, and water whose temperature becomes high by surplus heat is driven out to remove after-heating, and the opening and closing of the stop valve are made slow by means a speed reduction gear thereby to prevent water hammering from occurring.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a stop-start type gas instantaneous water heater.

Conventional Technology In recent years, water heaters for home kitchens have improved in terms of safety, ease of use, and energy savings by incorporating continuous discharge and direct ignition systems into large water heaters. Among them, especially in terms of ease of use, water heaters that can ignite, dispense hot water, extinguish water, and shut off water with the touch of a button are becoming popular.

The configuration of a conventional water heater will be described below with reference to the drawings. In FIG. 9, 5th is an operating button, 59 is a spring that returns the operating shaft, and 60 is an operating shaft, each of which has a cam groove (commonly known as a heart cam groove).

Reference numeral 61 denotes an operating bearing, which is provided with a fulcrum hole that supports the stopper bin 62 that moves along the cam groove.

63 is a lever that is moved by the operating shaft 60 and rod 66, 64 is a fixed fulcrum pin of the lever 6a, and 65 is a movable fulcrum pin that connects the arm 76 and the lever 63. Reference numeral 67 is a fixture that holds down the spring presser 68 and supports the body, 69 is a spring that returns the rod 66, and 68a is a receiver thereof.

70 is the O-ring for sealing, 71 is the main valve, 72
is a lever moved by a rod, and pushes the safety valve 74 with a protrusion at one end. 73 is a lever support bottle.

77 is a movable fulcrum pin that connects the arm 78;
9 is a metal fitting for fixing the arm unit, and is provided with a protrusion for hooking an arm fo fulcrum pin 80 and a torsion coil spring 81 for returning the arm. A portion of the hook 82 is bent to maintain the posture of the hook 82 that hooks the head 85a'jz of the spindo 1v85.

83 is a torsion coil spring that tilts the hook 82 to the left side in the drawing, and its load is much smaller than that of the torsion coil spring 81. Reference numeral 84 is a fulcrum pin of the hook 82, which is fixed to the gear arm α1-. 85b is a valve provided on the spindle 1v85, which opens and closes the valve seat 88 joined to the diaphragm 86. 86a is diaphragm 8
A small hole provided in 6 communicates Pl and P2. 87 is a spring for constantly pressing the spindle against the valve seat 88.

89 is a water governor, 90 is a hydraulic response diaphragm, and 91 is
9 is a rod that pushes the water pressure responsive body 94; 92 is a hot water flow regulator;
3 is a venturi that takes differential pressure, 95 is a water pressure responsive valve, and 96
97 is the spring for the hydraulic valve, 97 is the main nozzle, 98 is
is the main burner, 99 is the pilot burner, 10o
is a spark plug. 101 is a thermocouple, 102 is an ignition discharge circuit, and has a discharge timer. 103 is a heat exchanger.

The operation of the gas instantaneous water heater configured as described above will be explained.

Figure 9 shows the fire extinguishing and water cutoff state.

<Ignition/Brewing water operation> When the operation button 58 is now pressed by hand, the operation shaft 6o operates the lever 63, and at the same time as the Rondoro 6 is pushed by one end of the lever 63, the switch 104 is turned on, and the ignition/discharge circuit 102 is turned on.
is activated, and discharge begins at the electrode of the spark plug 100. On the other hand, the rod 66 pushed by the lever 3 pushes the lever 72 and pushes the safety valve 74 with the protrusion at one end. The pressed safety valve 74 is instantly attracted and held by the ignition discharge circuit 102.

At the same time, the pilot burner 99 burns.

Also, when the lever 63 is pushed, the movable fulcrum pin 65
At the same time, arm 76 moves to the left side in the drawing via
8 also moves the fulcrum pin 8o to the left side of the drawing via the movable fulcrum pin 77.
When the fulcrum pin 54p of the hook 82 moves, the torsion coil spring 83 causes the hook 82 to fall to the left in the drawing, making a movement that embraces the head 85a of the spindle 1v85.

After that, when you release your hand, the operating shaft 60 tries to return to its original position by the force of the spring 59 and the spring 69, but this is prevented by the stopper pin 62 that moves along the cam groove formed in the operating shaft 6o. and stops midway. Then, the curved portion 82a of the hook 82
At this point, the head 85a of the spindle 85 is hooked, and the force of the screw coil spring 81 is used to pull the spindle 85 off. Then, the valve 85b opens and connects P2 and Pl to the small hole 86a.
The balance was maintained at the same pressure in the P2 chamber, but the balance was instantly broken and the water in the P2 chamber leaked out.
The pressure decreases, pl>p2, and the diaphragm 86
is moved to the P2 room side and water flow is started.

The water that has started flowing flows through the water governor 89 to the venturi section, and the flow generates a pressure difference, which pushes the diaphragm 90 and pushes the hydraulic responsive body 94 with the rod 91, opening the hydraulic responsive valve 95 to release water from the main nozzle 97. The ejected gas becomes an air-gas mixture and ejects from the flame hole surface of the main burner 98. The flame formed in the waiting pilot burner 99 ignites and burns. On the other hand, the water that flows out undergoes heat exchange and is discharged.

Next, when extinguishing the fire and shutting off the water> When the operating button 58 is pressed again in the operating state and released, the stopper pin 62 that is blocking the return of the operating shaft 60 will come into contact along the peripheral wall of the cam groove. At the same time the operating shaft returns to its original position by the spring 59, the rod 6
6 is also returned to its original position by the spring 69, and the main valve 71 closes to cut off the gas and stop combustion. On the other hand, the spindle head 85a, which was hooked on the curved portion 82a of the hook 82, is also removed. At the same time, spring 87
At this point, the valve 85b is closed and the main valve 88a is closed so that no water flows and the water is stopped. These operations described above are performed almost simultaneously.

Problems to be Solved by the Invention However, in the gas instantaneous water heater having the above configuration, (1) In the fire extinguishing/water shutoff operation, the main valve 88a of the faucet closes at the same time as the fire is extinguished, so the heat exchanger is closed. The residual heat remains and the after boil is high.

(2) Since the faucet valve opens and closes instantaneously, water hammer occurs when hot water is turned on and off.

(3) As a means of maintaining the balance between the high-pressure side and the low-pressure side of the faucet, a small hole (usually 1 dia or less) is provided in the diaphragm or part of the valve, but because it is a small hole, scale and dirt can clog it. It is easy to cause water to stop.

Means for Solving the Problems The gas instantaneous water heater of the present invention, which solves the above-mentioned problems, rotates the motor in forward and reverse directions by switching the contacts of a motor drive switch linked to an operating camshaft after opening and closing the gas valve. It is equipped with a structure that opens and closes a water stop valve and stops the rotation of the motor using a motor rotation detection switch.

Effects of the present invention With the configuration described above, the water stop valve is not opened and closed instantaneously, but is opened and closed gradually using a reduction gear and a motor. After 1 to 2 seconds, the water is stopped and the water that has become high due to residual heat is expelled to eliminate boiling water.The combination of a reduction gear and a motor allows the water stop valve to open and close more slowly, thereby preventing the occurrence of water hammer.

EXAMPLE Hereinafter, a gas instantaneous water heater according to an example of the present invention will be described with reference to the drawings.

Figures 2 to 5 are main gas block diagrams, and represent the states of ignition, hot water supply, extinguishing, and water shutoff by the movements of gas valves, stopper bins, and switch levers. Note that the components are the same from FIG. 2 to FIG. 5.

In FIG. 2, 1 is an operation push button, 2 is an operation camshaft, which has four faces, and has a protrusion 2a on the - face that presses the protrusion of a leaf spring 8 for turning the ignition circuit switch 7 on and off. A cam groove is formed on one of the remaining three sides. The shape of the cam groove is shown in Fig. 6 (f) plan view and (b) groove center sectional view O.
aa'bcdefghij k (l a') Points Q to d are gentle nulobes that fall at point d. Points e and f that have fallen are from point i, which is at the same height as point Q = a. The gradient from point g to point 0 is greater than the gradient from point 0 to point d.It falls one step from point g and connects with point h and point i, and falls one step further from point i and connects with point 1k (la').(B) In the cross section As shown, the height of the groove is based on surface 2b, 0=a') a') b>c) point d, e=o, a, l≦0
g (d, d point〉h, i point〉g point, h = iH point - point = g
, +L j , point e≦point d.

It becomes.

Reference numeral 3 denotes a cam bearing that guides the operating camshaft 2, and a fulcrum of the stopper bin 9 that moves along a cam groove formed in the operating camshaft 2 is provided on a part of the back surface of the cam bearing surface 2b that contacts the cam groove. ing. 4 is a plate for preventing the stopper bin 9 from falling, which is fixed together with the cam bearing 3 to a fixture 6 for fixing the steering camshaft unit l-i.

Reference numeral 5 denotes a presser spring that prevents the end surface of the stopper bottle 9 that contacts the cam groove from floating, and one end of which is always in contact with the spring pin 9. The other is fixed to a cam bearing.

Switches 11 and 12 are attached to the fixture 6 and actuate the switch lever 1 (1) at the curved protrusion 9a of the stopper bin 9 to reverse the rotation (motor shown in FIG. 7, 26) via the switch lever 10. is 1 with O-ring for sealing.
6 is the main body of the gas body.

17 is the O-ring back, 18 is the stem, 19 is the gas valve, 20 is the valve holder, and 21 is the main spring. A stem guide 22 prevents the stem 18 from swinging.

23 is a lever, and when one end is pushed by the stem 18, it rotates using the lever pin 24 as a fulcrum, and the lever projection 24a closes the safety valve 2.
Press 5.

Next, to explain the water block configuration in Figure 7, 26
is a water stop valve opening/closing shaft drive motor (hereinafter referred to as motor), and a gear B30 for rotating the opening/closing shaft 31 of the water stop valve 35 is attached to a gear A27 directly connected to the shaft.

Also, is there a rotational position for gear A27? Cam portions 27a and 27b for detection are provided, and a rotational position detection switch close limiter 28 and open limiter 29 are attached to each of them.

32 is a bearing for the opening/closing shaft a1 of the water stop valve 35;
．． Reference numeral 34 denotes a water seal o/g for these parts.

A6 is a water supply gasket attached to the water stop valve 35. A7 is a valve spring configured to always close the water stop valve, and 38 is a spring holder for the valve spring. a9 is an O-ring for water sealing.

40 is a governor plug, 41 is a water valve, 42 is a diaphragm, 43 is a plate for the diaphragm receiver, 44 is a rod A that pushes a hydraulic response rod, 45 is a hot water flow regulator, and 46 is a venturi.

Figure 8 is the electrical system circuit diagram of Figures 2 to 7.
is an ignition circuit with a discharge timer, and 48 is a dry battery.

The operation of the gas instantaneous water heater constructed as described above will be explained with reference to FIGS. 2 to 5, FIGS. 6, 7, 8, and 1.

2. In the gas block diagram showing the position of extinguishing and water shutoff, that is, the position of rotation stop, the end surface that contacts the bottom of the cam groove of the stopper bin 9 is located at the lowest end, that is, point a in Figure 6. are doing. Switch 11 and switch 12 thus reversing the motor
, the ignition circuit switch 7 is not pressed and does not turn on. In this state, the opening/closing shaft a1 is adjusted and set so that the water stop valve a5 is closed. At the same time, a close limiter 2B of a position detection switch is attached in advance to the cam portion 27a of the gear A27 directly connected to the motor 26 so as to operate. The contact state positions of the close limiter 28 and the open limiter 29 are in opposite states. In other words, the close limiter 28 is N, O(
Normal, open) When K is present, open limiter 29 is N,
It is in position C (normal, closed).

When igniting and dispensing hot water> Figures 3 and 4 are gas diagrams showing when igniting and dispensing hot water. When the operation push button 1 is pressed by hand, the protrusion 2 & of the camshaft 2 pushes the protrusion of the leaf spring 8, When the contact point of the switch 7 for the ignition circuit shown in the circuit diagram of FIG. At the same time, the gas is instantly adsorbed in the pilot burner 54 by the spark from the spark plug Jj shown in FIG.

At this time, in FIG. 3, the end surface of the stopper pin 9 in contact with the cam groove is at the position e in FIG. 6, and the bent projection 9a of the stopper pin 9 is not operating the switch lever 10i. Here, the discharge is stopped after a certain period of time.

The camshaft is returned by the force of the pull 13.

At this time, the end surface of the stopper bin 9 in contact with the cam groove is the plane f-
Passing through g-h', it stops at plane h and temporarily stops the return of the camshaft. At the same time, the curved protrusion 9a of the stopper pin 9 operates the switch lever 10, and the contacts of the switch 11 and 12 that reverse the motor are Switching from N and C to N and O in FIG. 8, the motor 26 begins to rotate (in this case, rotates to the left). Then, also in FIG. 7, the gear A directly connected to the motor 26
27 rotates, the rotation is transmitted to the gear B30, the opening/closing shaft 31 is rotated, and the water stop valve 35 is pushed open, and water begins to flow. Pressure is generated and the diaphragm 42 is pushed, and the rod 44 pushes the hydraulic response rod 49 shown in FIG. The water becomes an air mixture gas at 53 and is combusted by the flame of the pilot flame, and the water is heat exchanged by the heat exchanger 57 and comes out as hot water from the hot water outlet pipe 58.

In this operation, when the motor 26 reaches a certain rotation angle, the cam part 27b of the gear A27 directly connected to the motor 26 pushes the lever of the rotational position detection switch opening limiter 29, and 29 in FIG. Switch to N or O and motor rotation (clockwise rotation) will stop. At the same time, the cam portion 27a separates from the lever of the closing limiter 2B and switches the contact of the closing limiter 28 from N and O to N and C.

Next, when extinguishing the fire and stopping hot water dispensing>, press the operation push button 1 in the state shown in Fig. 4, and the state shown in Fig. 5 will be shown, and the end surface of the stopper pin 9 in contact with the cam groove will be
It is located at a position t along the abutting surface through point h-i in FIG. Therefore, the motor reversing switch 11 in FIG.
There is no switching of 12 contacts. Next, when you release your hand from Fig. 5, it will look like the first Fig. 2, but at this time, the end surface of the stopper pin 9 in contact with the cam groove will change to -g-a' in Fig. 6.
- Pass through a. While this operation is in progress, the gas valve 19 closes to cut off the gas. 1 to 2 seconds after the gas is shut off, the contacts of the motor reversing switches 11 and 12 in Fig. 8 change from N and O to N and C, and the motor 26 reverses (in this case, rotates clockwise) and is directly connected to the motor 26. As the gear A27 rotates, the gear B30 rotates, and the water stop valve 35 closes due to the force of water pressure and the force of the nupling 37, stopping the flow of water. When the water stops, the hydraulically responsive valve is closed by the hydraulically responsive spring 1 in Figure 1. Due to the configuration in which the water is turned off 1 to 2 seconds after the gas is cut off, residual heat in the heat exchanger 57 is eliminated, so that after-boiling is also reduced. When the motor 26 reaches a certain rotation angle, the cam portion 27a of the gear 27 pushes the lever of the closing limiter 28, changing the contact point 28 from N and C to N and O in FIG. On the other hand, the contact of the limiter changes from N, O to N, CK, and all operations return to the stopped position. As described above, the movement of the stopper pin that moves along the cam groove is detected, the motor drive reversing switch is activated, the motor is rotated, and the water stop valve is opened in 1 to 2 seconds by the closing speed gear. Therefore, water hammer when opening and closing the water stop valve can be eliminated, after-boiling can be reduced, and there is no need to worry about burns or discomfort.

Effects of the Invention As described above, the present invention has a configuration in which a reversing switch for driving a motor is turned on and off in conjunction with the movement of an ignition operation camshaft to rotate the motor in forward and reverse directions. By providing a position detection switch, the water stop valve can be opened and closed gradually, thereby eliminating water hammer when opening and closing the water stop valve, and reducing after-boiling.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a gas instantaneous water heater in an embodiment of the present invention, FIGS. 2 to 5 are gas block diagrams of a gas instantaneous water heater in an embodiment of the present invention, and FIG. ) is a plan view of the groove shape of the camshaft in the gas block diagram, FIG. The electrical system diagram in the embodiment of the present invention, and FIG. 9 is the overall configuration diagram of the conventional example. 2... Operation camshaft, 11.12... Motor drive reversing switch, 19 ... Gas valve, 26 ... Motor, 28.29 ... Rotation position/replacement output switch, 35 ... Water stop valve. Name of agent: Attorney Toshio Nakao and 1 other person 2nd
yXJ

Claims (1)

[Claims] It has a gas valve that moves directly on the ignition operating camshaft, and is provided with a switch for driving the motor that is linked to the movement of the ignition operating camshaft, and after opening and closing the gas valve, the rotation of the motor is controlled in forward and reverse directions by switching the contacts of the switch. A gas instantaneous water heater that has a configuration in which the water stop valve is opened and closed by reversing the valve, and the rotation of the motor is stopped by a switch that detects the rotational position of the motor.