JP3073481U - Gas valve - Google Patents

Abstract

(57) [Problem] To provide a gas valve which can linearly control a gas flow rate over a wide range, can control a gas pressure and a flow velocity, and has a simple structure. SOLUTION: When the electromagnetic assembly 10 moves downward, the gas pressure on both sides of the main diaphragm 3 becomes uniform, the main diaphragm 3 is closed, and the gas does not flow inside the gas valve. When the electromagnetic assembly 10 moves upward, gas flows into the first compartment 101 and the second compartment 10
It flows into the second and fourth compartments 104. The gas flowing into the second compartment 102 flows into the third compartment 103 and applies pressure to the bottom of the main diaphragm 3. The gas flowing from the inlet 151 is divided into two, and the main diaphragm 3 is pushed open by the pressure of the main gas. The main gas flows out to the outlet 161.
The gas flowing to the fourth compartment 104 flows to the adjusting rod 17, and when the servo motor 25 operates, the adjusting screw 19 operates,
The pressure and flow rate of the gas flowing out of the outlet 161 are controlled.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a gas valve.

[0002]

[Prior art]

 Conventionally, the flow rate of gas fuel is controlled by installing a plurality of gas burners in a heating device. In the case of small combustion only some burners are activated. In case of large combustion many burners are activated in the system. In addition, the flow rate of the gas fuel in the heating device is controlled by a plurality of solenoid valves in the burner, and the flow rate of the gas fuel is controlled.

[0003]

[Problems to be solved by the invention]

 However, the simultaneous operation of multiple burners increases the heat output but also increases the cost. Also, the gas flow is not linearly controlled. When multiple solenoid valves are operated in a burner, the cost is high because many gas valves are required. Also, the gas flow is not linearly adjusted.

When a conventional heating device is operated by a plurality of gas burners, the cost is generally high because all gas burners require gas solenoid valves. In a conventional gas solenoid valve, the gas flow rate is controlled by a switch or the like, but the gas flow rate is not linearly controlled.

[0005] The conventional gas solenoid valve cannot control the flow rate of the gaseous fuel over a wide range, and the setting of the range is limited. Since the gas solenoid valve does not meet the temperature required by the user and the flow range of the gas fuel is small, a higher heat setting than necessary is adopted and energy is wasted.

[0006] The conventional gas solenoid valve is provided with a magnetic circuit provided with a fixed iron core, a plurality of magnets and magnetic members, a coil frame is provided around the fixed iron core, a coil is wound therearound, and the inside of the magnet is provided. The conventional gas solenoid valve has a complicated structure, which is inconvenient in use, since a sleeve is provided at a predetermined distance from the periphery of the fixed iron core and the operating part is provided with the fixed iron core.

When the ignition of the gas fuel in the heating device is automatically stopped, the gas fuel flows until the heating device is manually stopped because the conventional gas solenoid valve has no device for stopping the gas fuel. Continued and extremely dangerous.

Therefore, an object of the present invention is to provide a gas valve which can control the gas flow rate linearly over a wide range, can control the gas pressure and flow rate, and has a simple structure.

[0009]

[Means for Solving the Problems]

 According to the gas valve of the present invention, there is provided a valve body, wherein the valve body has an inlet, a first compartment, a second compartment, a third compartment, a fourth compartment, a fifth compartment, An outlet is formed. A first hole is formed at the inlet, and the inlet and the first compartment communicate with each other through the first hole. A balancing hole and a second hole are formed in the second compartment, and the first and third compartments communicate with each other via the balancing hole. The first hole and the fourth compartment communicate with each other via the second hole. The fourth compartment is in communication with the fifth compartment. The fifth compartment and the outlet are in communication. An electromagnetic assembly is installed in the first compartment and controls the flow of gas flowing from the first compartment to the fourth compartment via the second compartment. A main diaphragm is installed between the entrance and the third compartment. A valve spring is installed below the main diaphragm. The valve spring can move the main diaphragm upward, and closes the passage from the inlet to the second compartment. An adjusting diaphragm is installed in the fifth compartment, an adjusting spring is installed in the adjusting diaphragm, and an adjusting rod is installed in connection with the adjusting diaphragm. A servo motor is connected to this adjustment rod.

When the electromagnetic assembly moves down and the hole is closed, the pressure of the gas applied to both sides of the main diaphragm becomes uniform. Therefore, the main diaphragm remains closed, and gas cannot flow through the gas valve. When the electromagnetic assembly moves up and the hole is opened, the gas flows into the first compartment and is bisected into the second and fourth compartments. Gas flowing into the second compartment flows into the third compartment and pressure is applied to the bottom of the main diaphragm. The gas flowing from the inlet is divided into two parts, and the pressure of the divided gas is smaller than the pressure of the main gas, so that the main diaphragm is pushed open by the pressure of the main gas, and the main gas flows to the outlet. When the main diaphragm is opened, the outlet pressure is sensed. The gas flowing to the fourth compartment flows to the adjusting rod, which is controlled by adjusting. When the servomotor operates, the adjusting screw operates, the tension of the adjusting screw changes, and the pressure and flow rate of the gas flowing out of the outlet are controlled.

[0011]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the gas valve according to the present invention includes a valve body 1, a main diaphragm 3, a valve spring 5, an electromagnetic assembly 10, an adjustment diaphragm 16, an adjustment rod 17, an adjustment spring 19, a first gear 23, It has two gears 24 and a servo motor 25. A lid 2 is provided at the bottom of the valve body 1, an inlet 151 is formed at one end, and an outlet 161 is formed at the other end. Further, a first compartment 101, a second compartment 102, a third compartment 103, a fourth compartment 104, and a fifth compartment 105 are formed. A hole 1511 communicating with the first compartment 101 is formed in the entrance 151, a balancing hole 71 is formed in the first compartment 101, and the electromagnetic assembly 10 is installed.

A hole 81 is formed between the first compartment 101 and the fourth compartment 104. The flow of gas from the first compartment 101 to the fourth compartment 104 is controlled by the electromagnetic assembly 10. The balancing hole 71 communicates with the second compartment 102, and the second compartment communicates with the third compartment 103. A membrane plate 4 is provided on the bottom side of the main diaphragm 3, and the main diaphragm 3 is mounted between the outlet 161 and the third compartment 103, and is pushed up by the valve spring 5 to be moved upward by the valve spring 5. The flow path between the compartments 103 is blocked. The auxiliary diaphragm 16 is mounted inside the fifth compartment 105, and is detached from the worm shaft 24 of the motor by the operation of the adjusting spring 19. The auxiliary diaphragm 16 is provided with a valve seat between the fourth compartment 104 and the fifth compartment 105. The fifth compartment 105 and the outlet 161 are in communication. The servo motor 25 is provided with a crank driven by the servo motor 25 and rotated.

When the electromagnetic assembly moves down and the hole 81 is closed, the pressure of the gas applied to both sides of the main diaphragm 3 becomes uniform, and while the main diaphragm 3 is kept closed, the gas is supplied to the gas valve. Cannot flow inside. When the electromagnetic assembly 10 moves upward and the hole 81 is opened, the gas flows from the hole 1511 into the first compartment 101, is bisected, and is divided into the second compartment 102 and the second compartment 102 through the balancing hole 71 and the hole 81. It flows into the fourth compartment 104. The gas flowing into the second compartment flows into the third compartment 103 and pressure is applied to the bottom of the main diaphragm 3.

The gas flowing from the inlet 151 is divided into two parts, and the pressure of the divided gas is smaller than the pressure of the main gas, so that the main diaphragm 3 is pushed open by the pressure of the main gas, and the main gas is discharged to the outlet 161. Flows to When the main diaphragm 3 is opened, the pressure at the outlet of the adjusting diaphragm 16 is sensed by the feedback electrometer 80 or the pressure sensor 90 at the outlet 161. The gas flowing to the fourth compartment flows to the adjusting rod 17 controlled by the adjusting spring 19. The power of the servo motor 25 is transmitted to a gear 23 meshing with the gear 22, and is connected from the gear 22 to a worm shaft 24 provided on the top of the adjustment spring 19.

For this reason, when the servo motor 25 is started, the gears 22 and 23 rotate to drive the adjusting screw 20, the tension of the adjusting screw 19 changes, and the pressure and flow rate of the gas flowing out of the outlet 161 are controlled. You. The controller 26 compares the outlet pressure with the preset pressure, and when the outlet pressure is different from the preset pressure, the power supplied to the servo motor 25 is immediately shut off, thereby saving the power required for operating the gas valve. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing a gas valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a gas valve according to an embodiment of the present invention;

FIG. 3 is a schematic view illustrating a gas valve according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a gas valve according to an embodiment of the present invention;

FIG. 5 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 3 Main diaphragm 5 Valve spring 10 Electromagnetic assembly 16 Adjustment diaphragm 17 Adjustment rod 19 Adjustment spring 25 Servomotor 26 Controller 71 Balancing hole 81 Hole 101 First compartment 102 Second compartment 103 Third compartment 104 Fourth compartment Room 105 5th compartment 151 Inlet 161 Exit

Claims (5)

[Utility model registration claims] A valve body; an inlet provided in the valve body, the inlet having a first hole; a first compartment communicating with the inlet via the first hole; a balancing hole and a second hole. And a third compartment communicating with the first compartment via the balancing hole.
A compartment; a fourth compartment communicating with the first hole via the second hole; a fifth compartment communicating with the fourth compartment; and communicating with the fifth compartment. An electromagnetic assembly mounted within the first compartment and controlling the flow of gas flowing from the first compartment through the second compartment to the fourth compartment; A main diaphragm disposed between the inlet and the third compartment; mounted below the main diaphragm to drive the main diaphragm to close a passage from the inlet to the second compartment. A valve spring, an adjustment diaphragm attached to the inside of the fifth compartment, an adjustment spring attached to the adjustment diaphragm, connected to the adjustment diaphragm, and circulated from the fourth compartment to the outlet. Of gas An adjusting lever for controlling the speed, gas valve, characterized in that it comprises a servo motor, the driving of the adjusting rod. 2. The gas valve according to claim 1, further comprising a controller for controlling said servomotor. 3. The gas valve according to claim 1, wherein the servomotor is connected to an adjusting screw pressed against a top of the adjusting spring. 4. The gas valve according to claim 1, wherein the electromagnetic assembly is installed so as to open and close the second hole. 5. A controller for comparing the pressure at the outlet with a set value, and controlling the position of the adjustment rod by driving the servomotor when the pressure at the outlet is not equal to the set value. 3. The gas valve according to claim 2, further comprising: means for keeping the pressure at the outlet constant regardless of a change in the pressure at the inlet.