JPH0129340Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas proportional control valve used in household gas appliances such as water heaters and bathtubs.

In the field of household gas appliances, there is a need for devices that can continuously control the gas flow rate in order to automatically control the amount of gas burned (consumption) from the standpoint of safety and operability. Proportional control valves have been developed for this purpose.

As a proportional control valve currently in practical use, one using an electromagnetic solenoid type electromagnetic device is known. FIG. 1 is a longitudinal sectional view showing an example of an electromagnetic solenoid type proportional control valve. In the figure, 1 is a valve body, 2 is a gas inlet, 3 is a gas outlet, 7 is an electromagnetic solenoid, 8 is a yoke, 9 is an electromagnetic coil, 10 is a movable iron core, and 11 is a leaf spring. In this proportional control valve, the flow rate of gas flowing in from the gas inlet 2 and flowing out from the gas outlet 3 is controlled by adjusting the opening degree of the valve body 5. This is done by an electromagnetic solenoid 7 attached to the. That is, by energizing the electromagnetic coil 9, the movable core 10 is attracted into the yoke 7 and the valve body 5 closes, while by cutting off the current flowing to the electromagnetic coil 9, the movable core 10 absorbs the repulsive force of the leaf spring 11. The valve body 5 is opened by being repelled by the gas, and the flow rate of the gas is proportionally controlled by controlling the current flowing to the electromagnetic coil 9. However, the axial movement distance of this proportional control valve is
It has been said that it is difficult to obtain a proportional control valve with a wide dynamic range because of the limitations imposed by the leaf spring 11 supporting the valve.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a gas proportional control valve with a wide dynamic range and less product variation.

The gas proportional control valve of the present invention includes a valve body having a valve seat, a valve body that engages with the valve seat, a diaphragm fixed to the valve body, and a cylindrical shape made of a soft magnetic material attached to the valve body. Two cylindrical electromagnetic coils are arranged in the yoke so that the same polarity occurs in adjacent parts, and the central part of the electromagnetic coil is magnetized so as to interlink with the different polarity of each of the electromagnetic coils. A reciprocating drive device is provided, in which a non-magnetic spherical body is provided in a space between a movable element having a permanent magnet as a component and an inner peripheral surface of the cylindrical electromagnetic coil, and a shaft is provided at one end of the movable element, The valve body is characterized in that the shaft is connected to the valve body via the diaphragm, and the valve body is supported by the valve body via an elastic member.

The details of the present invention will be explained below with reference to the drawings.

FIG. 2 is a schematic sectional view showing an embodiment of the gas proportional control valve of the present invention. In the figure, 1 is the valve body, 2 is the gas inlet, 3 is the gas outlet, 4 is the valve seat, 5 is the valve body,
Reference numeral 12 indicates a reciprocating drive device, and the reciprocating drive device 12 is configured as follows. Case 20 with case 19 at one end and O-ring 29 at the other end
Two electromagnetic coils 14, 14a are mounted in a cylindrical yoke 13 made of a soft magnetic material, so that the same polarity occurs at adjacent portions. A cylindrical sliding member 28 is fixed inside these electromagnetic coils. A mover 15 is located in the center of the yoke 13.
is interposed via a non-magnetic spherical body 30 fixed to a holder 31 so as to be movable in the axial direction. Mover 1
5 has a permanent magnet 16 magnetized so that different poles interlink with each of the cylindrical electromagnetic coils 14 and 14a, and has magnetic pole pieces 17 and 17a at both ends of the permanent magnet 16, respectively.
is fixed, and a shaft 18 is further fixed to the end of the magnetic pole piece 17a. Next, the upper end of a rod-shaped connecting member 21 is movably inserted into the lower end of the shaft 18 and engaged with the valve body 5 via a compression coil spring 23 . Further, a diaphragm 6 whose outer edge is supported and fixed to the valve body 1 is clamped between support plates 22a and 22b.
These are integrated by a support plate 22, and a stop ring 24 attached to the connecting member 21 allows the valve body 5 to be
It engages with the upper end of the hollow protrusion 5a. Furthermore, an adjustment nut 26 attached to the bottom of the valve body 1
There is a compression coil spring 2 in the spring seat 27 fitted into the spring seat 27.
One end of the compression coil spring 25 is attached to the lower part of the valve body 5, while the other end of the compression coil spring 25 is attached to the lower part of the valve body 5.

The operation of the proportional control valve with the above configuration is as follows. When the cylindrical electromagnetic coils 14, 14a are energized to generate magnetic poles with the polarity as shown in FIG. A thrust according to Fleming's left-hand rule acts, and the mover 15 moves in the direction of the arrow x shown in the figure. On the other hand, the electromagnetic coil 14,
When the direction of energization to 14a is reversed, the magnetic poles generated in each coil will have polarities opposite to those shown in FIG. 2, and mover 15 will move in the direction of the arrow y in the figure. Therefore, the movement of the mover 15 in the direction of the arrow x opens the valve body 5, and the gas flowing in from the gas inlet 2 flows out from the gas outlet 3, and the movement of the mover 15 in the direction of the arrow y opens the valve body. 5 closes and gas outlet 3
The outflow of gas from the is stopped. In this case, the valve body 5
Since the valve body 1 is elastically supported by the compression coil spring 25, the valve body 5 can be moved with a repulsion force that is exactly proportional to the thrust force generated by the reciprocating drive device. Furthermore, since the spherical body 30 is interposed between the outer peripheral surface of the permanent magnet 16 and the inner peripheral surface of the sliding member 28, the contact resistance when the mover 15 moves in the axial direction is significantly reduced. This allows for smooth movement.

Here, FIG. 3 is a diagram showing the relationship between the input voltage and stroke of the valve drive device. In the diagram, the solid line is the one according to the present invention shown in FIG. 2, and the broken line is the one according to the electromagnetic solenoid shown in FIG. 1. It is.

From Fig. 3, the operating characteristic of the device of the present invention shows good linearity, whereas the operating characteristic of the device using an electromagnetic solenoid shown in Fig. 1 is 2.
It can be seen that the curve is as follows.

Next, FIG. 4 is a diagram showing the relationship between the input voltage, stroke, and secondary pressure of the proportional control valve shown in FIG. 2. From FIG. 4, it is clear that the proportional control valve of the present invention exhibits good linearity in its operating characteristics, and the secondary pressure is approximately proportional to the input voltage. However, in a proportional control valve, the gas that flows in from the gas inlet experiences a pressure loss between the valve body and the valve seat and flows out from the gas outlet, but the gas flow rate is determined by the pressure at the gas outlet, that is, the secondary pressure. It is known that it is proportional to the square root. Therefore, according to the present invention, by adjusting the input voltage, the secondary side pressure can be accurately controlled, and thus the gas flow rate can be accurately controlled.

Furthermore, Fig. 5 is a diagram showing the governor characteristics of the proportional control valve shown in Fig. 2, where lines A, B, and C represent the characteristics at different input voltages, and the input voltage value is A > B > H. There is a relationship between From FIG. 5, it is clear that according to the present invention, even if the primary pressure changes greatly, the secondary pressure is kept almost constant.

By the way, in Fig. 4, when the gas pressure (secondary side pressure) decreases below p, flame blowout and backfire tend to occur below a certain amount of gas depending on the characteristics of the burner that burns the gas. Combustion becomes unstable. Therefore, the gas pressure must be maintained at a value greater than p. However, the actuator has variations in characteristics, and some means is required to maintain the gas pressure at a value equal to or higher than p. Therefore, in the present invention, the coil spring 25 shown in FIG.
By rotating the adjusting nut 26 from outside the valve body and moving it up and down, the elastic force of the coil spring 25 can be adjusted and the gas pressure can be easily maintained at a value equal to or higher than p.

FIG. 6 is a sectional view showing another embodiment of the movable element of the present invention. In this case, the nonmagnetic spherical body 30 is held by the magnetic pole pieces 17, 17a of the mover 15, but it was confirmed that the operation and effect are the same as those shown in FIG. 2.

In each of the above embodiments, the movable element is composed of a permanent magnet and a magnetic pole piece, but depending on the type of magnet, the magnetic pole piece may be omitted.

When the proportional control valve of the present invention is applied to a No. 13 instantaneous water heater, for example, the pressure is approximately 50 to 330 mAq and the combustion amount is approximately 5,000 to 24,000 Kcal/ ^m3 , and the pressure and combustion amount are different. As many as 15 different gases could be used in common, the governor characteristics were extremely good, and the power consumption was only 3W. Also, when comparing this proportional control valve with an electromagnetic solenoid type that has almost the same performance, the power consumption is approximately
We were able to reduce the size by 40% and reduce the size by about 1/2.

As described above, according to the present invention, a reciprocating drive device in which a movable element composed of at least a permanent magnet is supported inside an electromagnetic coil via a spherical body is used as a driving means for the valve body. Since the sliding resistance of the child is reduced, its movement becomes smooth, and a proportional control valve with a wide dynamic range can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional proportional control valve, Fig. 2 is a sectional view showing an embodiment of the proportional control valve of the present invention, and Fig. 3 shows the voltage-stroke characteristics of the valve body drive device. Figure 4 is a diagram showing the relationship between the input voltage, stroke, and secondary pressure of the proportional control valve in Figure 2, and Figure 5 is a diagram showing the governor characteristics of the proportional control valve in Figure 3. FIG. 6 is a sectional view showing another embodiment of the proportional control valve of the present invention. 1... Valve body, 2... Gas inlet, 3... Gas outlet, 4... Valve seat, 5... Valve body, 12... Reciprocating drive device, 13... Cylindrical yoke, 14, 14a... Electromagnetic Coil, 15...Mover, 16...Permanent magnet,
17, 17a...Magnetic pole piece, 18...Shaft, 19,2
0...Case, 23...Coil spring, 29...O
Ring, 30...Nonmagnetic spherical body.

Claims (1)

[Claims for Utility Model Registration] 1. A valve body having a valve seat, a valve body that engages with the valve seat, a diaphragm attached to the valve body, and a soft magnetic material attached to the valve body. Two cylindrical electromagnetic coils are arranged in a cylindrical yoke such that the same polarity occurs in adjacent parts, and the different poles of each of the cylindrical electromagnetic coils interlink with each other in the center part of the electromagnetic coil. A non-magnetic spherical body is provided in a space between a movable element having a permanent magnet magnetized as a component and an inner circumferential surface of the cylindrical electromagnetic coil, and the movable element is interposed so as to be movable in an axial direction. , a reciprocating drive device having a shaft provided at one end of the mover, the shaft being connected to the valve body via the diaphragm, and the valve body being supported by the valve body via an elastic member. A gas proportional control valve characterized by: 2. The gas proportional control valve according to claim 1, which is characterized by having a structure in which the elastic force of the elastic member can be adjusted from outside the valve body.