JP3058192B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for switching capacity used in gas appliances such as water heaters, instantaneous water heaters such as baths, and gas fan heaters.

[0002] For example, the performance of a gas water heater depends on the range of the minimum hot water supply amount and the maximum hot water supply amount, that is, P which controls the gas amount.
₂ Determined by the size of the pressure control range. However, in the case of a relatively large-capacity water heater, the characteristics of the burner that burns the gas make it easy for the flame to blow out or flash back when a gas amount is less than a certain amount, and the combustion becomes unstable. It is customary to divide the burner into several parts and switch the performance by providing a switching solenoid valve for each burner. Further, in a relatively inexpensive water heater, the capacity may be switched by a plurality of solenoid valves without using a proportional valve. The present invention relates to such a valve device for switching performance.

[0003]

2. Description of the Related Art FIG. 5 shows a conventional valve device for switching capacity. In the figure, a gas flow path 1 is composed of a body 2 and a plate 3.
A gas inlet 4 is provided in one of the gas flow paths 1, and a plurality of gas outlets 5 and 5 ′ are provided in the body 2. Solenoid valves 6, 6 '(the same electromagnetic valves 6, 6' are usually used) are provided on the plate 3 corresponding to the gas outlets 5, 5 ', respectively.

Each solenoid valve 6, 6 ′ has a valve 9 urged in the direction of a valve seat 8 by a valve spring 7.
10 and a drive coil 11 for attracting the plunger 10. The drive coil 11 includes an inner yoke 12, an outer yoke 13, and the like. A sleeve 14 is provided between the drive coil 11 and the plunger 10, and O-rings 15, 16 are provided.
Is kept airtight. When the flow rate is low, one of the solenoid valves is closed, and the flow rate is adjusted by the other solenoid valve. When the flow rate is high, the flow rate is adjusted by both the solenoid valves.

[0005]

With the above-mentioned conventional valve mounting amount, an independent drive coil and a lead wire are required for each valve portion, so that the number of parts is increased, the cost is increased, and the space for placing the coil is increased. In addition, there is a problem that the number of manufacturing steps such as wiring work and assembly is increased.

An object of the present invention is to realize a valve device which is small in size and easy to assemble by operating a plurality of juxtaposed valve units with one driving electromagnet.

[0007]

Is In the valve device of the present invention SUMMARY OF THE INVENTION, the valve device body, and one of the valve electromagnet, are driven via the suction plate by the electromagnet, and each of
And two valves which are supported on a separate lever disposed et al is, the
A two one permanent magnet of the attraction plate, one of the magnetic poles provided to face an iron core of the electromagnet, the other suction plate
Is always urged in the valve closing direction by a spring . By adopting this configuration, it is small,
A valve device that is easy to assemble is obtained.

[0008]

When no exciting current is supplied to the electromagnet 30, the attraction plate 38 of the permanent magnet is attracted to the iron core 27 of the electromagnet 30 by its own magnetic force as shown in FIG. The driven valve 33 is closed. The other suction plate 36 is pushed down by the action of the spring 37, and the valve driven by the suction plate 36
32 is closed. Next, when the electromagnet 30 is excited with a DC current so as to have a polarity to attract the attraction plate 38 of the permanent magnet, FIG.
As shown in (b), the permanent magnet attraction plate 38 remains attracted and the valve 33 remains closed, but the other attraction plates 36 are attracted and the valve 32 is opened.

Next, as shown in FIG. 2C, when the polarity of the exciting current of the electromagnet 30 is reversed, the valve 33 is opened because the attracting plate 38 of the permanent magnet is repelled. The other attraction plate 36 is attracted regardless of the polarity of the electromagnet 30, so that the valve 32 remains open.

Next, when the excitation of the electromagnet 30 is stopped, the attraction plate 38 of the permanent magnet is attracted to the iron core 27 of the electromagnet 30 by its own magnetic force, and the other attraction plates 36 are released from the attraction. 33
Are both closed and return to the initial state of FIG. In this manner, a plurality of valves can be separately controlled by exciting the electromagnet and reversing the polarity of the exciting current.

[0011]

FIG. 1 is a sectional view showing an embodiment of the present invention.
In the figure, reference numeral 20 denotes a valve device main body including a body 21 and a plate 22, and a gas flow path 23 is formed in the valve device main body 20, one of which is a gas inlet 24. A plurality of (two in the figure) gas outlets 25 and 26 are formed in the lower part of the body 21, and an electromagnet 30 including an iron core 27 and a yoke 28 and a coil 29 is provided on the upper surface of the plate 22. It is attached with the member 31 interposed therebetween. 29a is a terminal of the coil.

Further, in the gas passage 23 of the valve device body 20,
Valves 32 and 33 for opening and closing gas outlets 25 and 26, respectively, and each valve
Lever 34 and 35 for swingably supporting 32 and 33 are provided, and one end of one lever 34 has a suction plate 36 made of a soft magnetic material.
A valve 32 is provided between the suction plate 36 and the plate 22.
There is provided a spring 37 for urging in a direction to close the spring. At one end of the other lever 35, an attraction plate 38 made of a permanent magnet is provided so that one of its magnetic poles faces the iron core 27 of the electromagnet 30. The valves 32, 33 are supported with play by levers 34, 35, respectively.
Valve springs 39, 40 are inserted between 33 and levers 34, 35.

The operation of the embodiment constructed as described above will be described with reference to FIG. First, as shown in FIG.
When the excitation current is not supplied to 30, the permanent magnet attraction plate 38 is attracted to the iron core 27 of the electromagnet 30 by its own magnetic force, and the valve 33 driven by the attraction plate 38 is closed. The suction plate 36 made of a soft magnetic material is pushed down by the action of the spring 37 to close the valve 32 driven by the suction plate 36.

Next, as shown in FIG. 2 (b), the electromagnet 30 is turned, for example, by a coil so as to have a polarity for attracting the attracting plate 38 of the permanent magnet.
When a positive voltage is applied to the terminal 29a of 29 and a negative voltage is applied to the terminal 29b, if the DC current is applied so that the lower part of the iron core 27 facing the S pole of the attracting plate 38 of the permanent magnet becomes the N pole, the permanent magnet The adsorption plate 38 remains adsorbed on the iron core 27, and the valve 33 is closed. On the other hand, the adsorption plate 36 made of a soft magnetic material is adsorbed on the iron core 27 and opens the valve 32.

Next, when the polarity of the exciting current supplied to the electromagnet 30 is reversed as shown in FIG. 2C, the lower part of the iron core 27 becomes the S pole, so that the permanent magnet attraction plate 38 is repelled and the valve 33 is turned off. open. Further, since the attraction plate 36 made of a soft magnetic material is attracted regardless of the polarity of the electromagnet 30, the valve 32 remains open.

Next, when the exciting current of the electromagnet 30 is stopped, the attraction plate 38 of the permanent magnet is attracted to the iron core 27 by its own magnetic force,
Close 33. The adsorption plate 36 of the soft magnetic material is released from the adsorption,
The valve 32 is closed by the action of the spring 37 and returns to the initial state of FIG.

According to this embodiment, the opening and closing of a plurality of valves can be separately controlled by exciting the electromagnet and reversing the polarity of the exciting current. In addition, since only one electromagnet is required, the size can be reduced as compared with the related art, and the assembly becomes easy.

FIG. 3 is a diagram showing an application example of the present invention. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals.
This application example has substantially the same configuration as the previous embodiment, except that the soft magnetic attraction plate 36 of the previous embodiment is a permanent magnet, and the lever 34 is also a seesaw type similar to the lever 35. . The directions of the magnetic poles of the two permanent magnets 36 'and 38 are the same.

The application example thus configured is an electromagnet 30
Depending on the direction of the exciting current, the left and right suction plates 36 ', 38 are simultaneously attracted or repelled, and the valves 32, 33 can be opened or closed simultaneously.

FIG. 4 is a diagram showing another application example of the present invention. The configuration of this application example is almost the same as the previous application example, except that the magnetic poles of the attracting plates 36 'and 38 of the permanent magnet are attached to the levers 34 and 35 so that they are opposite to each other. is there.

In this application example, the suction plate is alternately attracted or repelled by changing the direction of the exciting current of the electromagnet 30. Therefore, the valves 32 and 33 are alternately opened and closed so that one is opened and the other is closed. In addition, in the above two application examples, the size of the valve device can be reduced and the assembling can be facilitated.

[0022]

According to the present invention, the opening and closing of a plurality of valves can be controlled separately by using one electromagnet and a plurality of suction plates and making at least one of the suction plates a permanent magnet. Can be. In addition, since a single electromagnet is required to control a plurality of valves, a valve device which is smaller than the conventional one and which can be easily assembled can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention.

FIG. 3 is a diagram showing an application example of the present invention.

FIG. 4 is a diagram showing another application example of the present invention.

FIG. 5 is a view showing a conventional capacity switching valve device.

[Explanation of symbols]

 20 ... Valve device body 21 ... Body 22 ... Plate 23 ... Gas flow path 24 ... Gas inlet 25,26 ... Gas outlet 27 ... Iron core 28 ... Yoke 29 ... Coil 30 ... Electro magnet 31 ... Cushion member 32,33 ... Valve 34, 35 ... Lever 36 ... Soft magnetic material attracting plate 37 ... Spring 36 ', 38 ... Permanent magnet attracting plate 39,40 ... Valve spring

Claims (1)

(57) [Claims] To 1. A valve device body (20), and one valve electromagnet (30), each driven via a suction plate (36, 38) by the electromagnet (30), and by each
Valves (3 ) supported by two levers (34, 35)
2, 33) are provided, et al is, the two suction plate (36, 3
8) is one permanent magnet, provided that one magnetic pole is opposed to the iron core (27) of the electromagnet (30), the other
Of the suction plate (36) is always closed by the spring (37)
A valve device which is biased in a chain direction .