JPS6232367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas pressure regulator that drives a gas pressure control section with an electric signal and continuously controls the gas pressure (flow rate) in proportion to the electric signal.

A conventional gas pressure regulator was constructed as shown in FIG. That is, the gas pressure control section is composed of a valve seat 1, a valve body 2, and a diaphragm 3, a spring 4 that generates a force to regulate the pressure, an adjustment screw 5, and a vent hole 6. teeth,
Enters the gas pressure regulator 8, and the pressure on the gas outlet side 9,
The force of the spring 4 is balanced, and a substantially constant gas pressure is supplied to the burner 10 for combustion.

A problem with this conventional gas pressure regulator is that valve vibration may occur due to the gas flow rate, pressure, mass of the valve body 2, shape of the gas flow path, etc. When this valve vibration occurs, the amount of gas supplied to the burner 10 fluctuates, making normal pressure control impossible. In particular, in a structure (not shown) that drives the valve body 2 in proportion to an electric signal, it is necessary to control the pressure over a wide range from small flow rates to large flow rates, so valve vibration occurs in the small flow rate range. Cheap.

The present invention is intended to improve these conventional problems, and aims to prevent valve vibration from occurring even when controlling gas pressure over a wide range.

In order to achieve this object, the present invention provides a back pressure chamber by providing an elastic partition plate and a fixed partition plate on the upper part of the valve body, and a small hole communicating between the back pressure chamber and the combustion chamber or the atmosphere. The fixed partition plate is provided with a bush and a pin, and the force of the regulating force generating part is applied to the valve body via the pin.

With this configuration, the volume of the back pressure chamber changes according to the displacement of the valve body, and because it communicates with the combustion chamber or the atmosphere only through small holes, rapid movement of the valve body is suppressed due to viscous resistance. be able to. In other words, the rapid movement of the valve body, that is, the rapid movement of the elastic partition plate, generates a positive or negative pressure in the back pressure chamber relative to the combustion chamber pressure or atmospheric pressure, and that pressure is generated by the movement of the elastic partition plate. Acts in the opposite direction.
Furthermore, since the force of the pressure generator is applied to the valve body through the pin, the pin also moves as the valve body moves. Therefore, the resistance in the vibration system between the pin and the bush increases, suppressing rapid movement of the valve body.

An embodiment of the present invention will be described below with reference to FIG. In the figure, the gas pressure regulator 11 is connected to the gas inlet 1
A valve seat 14 is formed in the middle between 2 and the gas outlet 13,
A valve body 15 is provided opposite the valve seat 14, and has a coil spring 16 that biases the valve body 15 in the valve closing direction, and an adjustment screw 17 is provided to adjust the force of the coil spring 16. A diaphragm 18 is attached to the upper end of the valve body 15 to isolate the gas flow path 19 and the back pressure chamber 20. The gas pressure control section A is configured from the above. Reference numeral 21 denotes a fixed partition plate that forms the back pressure chamber 20, and on the top thereof, there are the plunger 21 and the electromagnetic coils 22 provided around it.
A yoke 23 and yoke plates 24 and 25 are provided to form a magnetic circuit, and a regulating force generating section B is provided which generates a force in a direction that pushes the valve body 15 downward when energized. Reference numeral 26 denotes a leaf spring that supports the plunger 21 so as to be vertically movable without sliding. A bush 27 made of resin is provided at the center of the fixed partition plate 21, and is configured to apply the force of the regulating force generating section B to the valve body 15 via a pin 28.

Here, the bush 27 and pin 28 are dimensioned so that sliding friction is minimal and resistance in the vibration system is large. Further, 29a is a small hole that communicates the back pressure chamber 20 and the electromagnet chamber 30, and 31 is a small hole that communicates the back pressure chamber 20 with the electromagnet chamber 30.
0 and a cover case that airtightly constitute the electromagnet chamber 30, and 32 is a communication pipe that communicates the back pressure chamber 20 and the combustion chamber 33, and a small hole 2 is provided in the part near the back pressure chamber.
9b is provided.

In addition, 34 is an appliance burner, and 35 is a heat exchanger.

In the above configuration, the operation will be explained next.

When the electromagnetic coil 22 is energized, the plunger 21 is displaced downward, acts on the valve body 15 via the pin 28, and controls the pressure at the fluid outlet 13 in proportion to the amount of energization.

FIG. 3 shows the characteristics when the coil current I and the pressure at the fluid outlet 13 are P, which is a quadratic curve.

In addition, FIG. 4 shows the pressure P in FIG. 3 at the burner 34.
This is a characteristic diagram converted to the gas flow rate Q at , and it can be seen that the flow rate can be controlled linearly in proportion to the current.
It also has a well-known governor function.

By the way, in conventional gas pressure regulators, when the flow rate is controlled over a wide range, valve vibrations may occur in the low flow rate region, but in one embodiment of the present invention, the gas pressure control section A and the regulating force generation section A fixed partition plate 21 is provided between B to form a back pressure chamber 20, and a communication pipe 32 is provided to connect the back pressure chamber 20 and the combustion chamber 33.
In addition, since the damper portion is formed by providing the small holes 29a or 29b, rapid movement of the valve body 15 can be suppressed due to the viscous resistance of the air passing through the small holes 29a or 29b. That is, valve body 1
The rapid movement of 5 generates a positive or negative pressure change in the back pressure chamber 20 with respect to the pressure of the combustion chamber 33 via the diaphragm 18, which pressure is opposite to the direction of movement of the diaphragm 18 and thus the valve body 15. Acts on the direction.

Here, by making the volume of the back pressure chamber 20 as small as possible and making the small hole 29b have a diameter of 0.3 to 1 mm according to experiments, it becomes more stable against valve vibration.

Further, a bush 27 is provided in the center of the fixed partition plate 21, and is configured to apply the force of the regulating force generating section B to the valve body 15 via a pin 28.
As the button 5 moves, the pin 28 also moves, and the button 2
The viscous resistance in the vibration system between 7 and pin 28 increases. This is very effective in preventing valve vibration.

Here, when the bush 27 and the pin 28 were formed with a gap of 50 μm on one side so as not to increase the sliding resistance, the viscous resistance in the vibration system was about 10 times larger than that of the conventional example shown in FIG.

The effects described above make it possible to prevent valve vibration from occurring even when gas pressure is controlled over a wide range. Also, bush 27 and pin 28
By providing this, even when the force of the regulating force generating section B acts on the valve body 15 in an inclined manner,
This is corrected, and a force is always applied perpendicularly to the valve body 15. This is effective in reducing variations and hysteresis in current-gas flow characteristics.

Furthermore, in the embodiment shown in FIG. 2, since the combustion chamber 33 and the back pressure chamber 20 are communicated through the communication pipe 32, it is possible to prevent fluctuations in the amount of gas burned due to pressure fluctuations in the combustion chamber 33 due to external wind pressure, etc. , a constant combustion amount is always obtained, and even if the diaphragm 18
Even if the combustion chamber is damaged, the raw gas flows through the communication pipe 32 into the combustion chamber 33 and is burned, without leaking to the outside.

Note that when the back pressure chamber 20 is communicated with the atmosphere, it does not have the effect of communicating with the combustion chamber 33 described above, but the effects of preventing valve vibration and stabilizing control characteristics do not change at all.

FIG. 5 shows another embodiment of the present invention, in which the back pressure chamber 2
0 through the small hole 29a and the electromagnet chamber 30 to the communication pipe 3.
2, it communicates with the combustion chamber 33. Other members and elements are the same as those in the embodiment shown in FIG. 2, and are given the same numbers and description thereof will be omitted.

According to this embodiment, the bush 27 and the pin 28
Since the viscous resistance in the vibration system can be further increased and the diameter of the small hole 29a can be provided with high accuracy, the effect of suppressing valve vibration can be further increased.

As explained above, the present invention includes a gas pressure control section that includes a valve seat, a valve body, and an elastic partition plate, a regulating force generation section that generates a force for operating the valve body, and a back pressure chamber of the elastic partition plate. A fixed partition plate is provided to form a damper portion, and a small hole is provided to communicate the back pressure chamber with the combustion chamber or the atmosphere, and a damper portion is formed.
A bush and a pin are installed on the fixed partition plate, and the force of the regulating force generator is applied to the valve body through the pin, and the resistance in the damper part and the vibrating string between the bush and pin is large. Therefore, even when controlling gas pressure (flow rate) over a wide range, valve vibration does not occur. In addition, by providing a bush and a pin, the force of the regulating force generating section acts on the valve body through the pin, so even if the force of the regulating force generating section acts in a tilted manner, the bush and pin will correct it. Therefore, a force is always applied perpendicularly to the valve body. Therefore, there is no dead zone or hysteresis, and stable control characteristics can always be obtained.

Furthermore, by providing a fixed partition plate, it is possible to minimize the volume of the back pressure chamber, and by screwing the fixed partition plate to the gas pressure control section, it can be used in the event that the regulating pressure generation section breaks down. , unique effects such as being able to replace the gas circuit without opening it to the atmosphere can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional gas pressure regulator, Fig. 2 is a sectional view of a gas pressure regulator showing an embodiment of the present invention, and Figs. 3 and 4 are current diagrams in an embodiment of the present invention. -Characteristic diagram showing pressure characteristics and current-flow characteristics,
FIG. 5 is a sectional view of a gas pressure regulator showing another embodiment of the present invention. 14... Valve seat, 15... Valve body, 18... Diaphragm (elastic partition plate), 20... Back pressure chamber, 21...
...Fixed partition plate, 27...Button, 28...Pin, 29a, 29b...Small hole, A...Gas pressure control section, B...Adjustment pressure generation section.

Claims (1)

[Claims] 1. A valve seat, a valve body provided opposite to this valve seat,
A gas pressure control section consisting of an elastic partition plate provided above the valve body, a regulating force generation section that generates a force acting on the valve body when energized, and a back pressure chamber of the elastic partition plate. A fixed partition plate partitioning into small chambers having a damper effect, a small hole communicating with the back pressure chamber and the combustion chamber or the atmosphere, a bushing provided on the fixed partition plate, and a pin passing through the bushing,
A gas pressure regulator in which the force of the regulating force generator is applied to the valve body via the pin.