JPS6347331Y2 - - 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, devices that can continuously control the gas flow rate are required 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.

Proportional control valves currently in practical use can be roughly classified into electromagnetic solenoid type and moving coil type. FIG. 1 is a longitudinal sectional view showing an example of an electromagnetic solenoid type proportional control valve. In the figure, 1 is the 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 is pulled into the leaf spring 11.
The valve body 5 is opened by the repulsive force of the electromagnetic coil 9, and the flow rate of the gas is proportionally controlled by controlling the current flowing to the electromagnetic coil 9. However, this proportional control valve varies depending on the type of gas.
The spring 11 must be replaced, and as it is, it is unsuitable as a general household appliance. In addition, this proportional control valve requires a lot of man-hours to adjust the minute gas amount during slow ignition due to variations in spring strength, resulting in a product with large variations, and also has many problems such as increasing power consumption. It has shortcomings.

Next, the moving coil type proportional control valve uses a moving coil as an electromagnetic drive means instead of the electromagnetic solenoid in Fig. 1, but because the capacity of the moving coil is limited, only a small thrust can be obtained. Since it does not have a closing function, it is necessary to separately provide an electromagnetic solenoid to compensate for this, and there are problems such as an increase in the size of the device.

Furthermore, in addition to the above-mentioned proportional control valves, there are
A device using a moving magnet type electromagnetic device is also known. However, this proportional control valve also has the same problems as the electromagnetic solenoid type. In addition, this proportional control valve is a poppet valve type and does not have a governor effect, and its controllability is greatly affected by fluctuations in the primary pressure.To prevent this, a governor device must be installed separately, which requires a large number of parts. There is a disadvantage that this increases the weight and size of the product.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional technology, and to provide a gas proportional control valve with excellent governor characteristics, a closing function, easy gas conversion, small size, low power consumption, and less product variation. It is to be.

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 diaphragm attached to the valve body,
Two cylindrical electromagnetic coils are arranged in a cylindrical yoke made of a soft magnetic material so that the same polarity occurs in adjacent parts, and a chain with a different polarity of each of the electromagnetic coils is placed in the center of the electromagnetic coil. A movable element whose components are permanent magnets magnetized so as to intersect with each other, and a reciprocating drive device having a shaft at one end of the movable element, the shaft is connected to the valve body through the diaphragm. The valve body is connected to the valve body, and the valve body is supported by the valve body via an elastic member, and the elastic force of the elastic member can be adjusted from outside the valve body.

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. Two electromagnetic coils 1 are installed in a cylindrical yoke 13 made of soft magnetic material.
4 and 14a are attached so that the same polarity occurs in adjacent parts. A movable element 15 is interposed in the center of the yoke 13 so as to be movable in the axial direction. The movable element 15 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 17 at both ends of the permanent magnet 16, respectively.
a is fixed, and a shaft 18 is attached to the end of the magnetic pole piece 17a.
is fixed. Next, the upper end of a rod-shaped connecting member 21 is movably inserted into the lower end of the shaft 18, and the lower part of the connecting member 21 is inserted into the hollow protrusion 5a of the valve body 5, and the valve body 5 is engaged. The diaphragm 6, whose outer edge is supported and fixed to the valve body 1, is connected to the support plates 22a and 22.
b, and is integrated with these by a support plate 22, and is engaged with the upper end of the hollow protrusion 5a of the valve body 5 by a retaining ring 24 attached to the connecting member 21. Further, one end of a compression coil spring 25 is installed in a spring seat 27 fitted into an adjustment nut 26 installed at the bottom of the valve body 1, while the other end of the compression coil spring 25 is installed at the bottom of the valve body 5. There is.

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 similar to Fleming's left hand acts, and the mover 15 moves in the direction of the arrow x shown in the figure. On the other hand, the electromagnetic coils 14, 14a
When the direction of energization is reversed, the magnetic poles generated in each coil will have polarities opposite to those shown in FIG. 2, and the mover 15 will move in the direction of the arrow y shown 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 21 in the direction of the arrow y opens the valve body. 5 is closed, and the outflow of gas from the gas outlet 3 is stopped. In this case, since the valve body 5 is elastically supported by the valve body 1 by the compression coil spring 25, the valve body 5 can be moved with a repulsive force exactly proportional to the thrust generated by the reciprocating drive device.

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, it is clear that the operating characteristic of the electromagnetic solenoid according to the present invention exhibits good linearity, but the operating characteristic of the electromagnetic solenoid becomes a quadratic curve.

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.

In addition, 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, the flame tends to blow out or reverse when the amount of gas is below a certain amount depending on the characteristics of the burner that burns the gas. Combustion becomes unstable, so the gas pressure must be limited to a value equal to or higher than P. However, actuators vary in their characteristics, and some means is required to limit the gas pressure. Therefore, in the present invention, the coil spring 25 shown in FIG. 2 is raised and lowered by rotating the adjusting nut 26 from outside the valve body.
By adjusting the elastic force of the coil spring 25, the gas pressure can be easily limited to 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, two cylindrical permanent magnets 16', 16' are attached to a bar-shaped magnetic pole piece 17' as a mover 15'.
It was confirmed that the function and effect were the same as those shown in FIG. 2, although the device with fixed a was used.

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, for example, a No. 13 instantaneous water heater, the pressure is approximately 50 to 330 mAq and the combustion amount is approximately 5000 to 24000 Kcal/ ^m3 , and the pressure and combustion amount are different. As many as 15 types of gas could be used in common, the governor characteristics were extremely good, and the power consumption was only 3W. In addition, 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, it is possible to obtain a proportional control valve that has excellent governor characteristics, has a closing function, can share many types of gas, is compact, and consumes little power.

[Brief explanation of drawings]

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. FIG. 4 is a diagram showing the relationship between the input voltage, stroke, and outlet pressure of the proportional control valve of FIG. 2, and FIG. 6 is a diagram showing another embodiment of the movable element of the proportional control valve of the present invention. FIG. 1: Valve body, 2: Gas inlet, 3: Gas outlet,
4: Valve seat, 5: Valve body, 12: Reciprocating drive device, 1
3: Cylindrical yoke, 14, 14a: Electromagnetic coil, 1
5, 15': mover, 16, 16', 16'a: permanent magnet, 17, 17a, 17': magnetic pole piece, 18,
18a: shaft, 19: coil spring, 20: case.

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 are interlinked at the center of the electromagnetic coil. A movable element having a permanent magnet magnetized as a component is provided, and a reciprocating drive device having a shaft provided at one end of the movable element, the shaft being connected to the valve body via the diaphragm. The gas proportional control valve is further characterized in that the valve body is supported by the valve body via an elastic member. 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.