JPH01256715A - Gas regulator - Google Patents

Abstract

PURPOSE:To dampen a variation in pressure in a controlling chamber so as to prevent hunting by a method wherein a plug is provided with a throttled hole communicating an interior part of an accumulator with the controlling chamber and volume of an accumulator and a hole diameter of the throttled hole are properly selected. CONSTITUTION:A plug 22 divides a controlling chamber 7 and an interior part of an accumulator 21 and the plug is formed with a throttled hole 23 for communicating the controlling chamber 7 with the interior part of the accumulator 21. That is, the controlling chamber 7 and the accumulator 21 communicate with each other through the throttled hole 23 of the plug 22 and then variation in an inner pressure of the controlling chamber 7 is damped. Even if a boosted pressure of a turbo-charger 28 acting as a pilot pressure is rapidly varied, a variation of an inner pressure in the controlling chamber 7 is dampened. As a result, even if a flow rate of gas fed out of a space 14 is less in volume, a so-called hunting phenomenon in which a valve 3 repeats its ON or OFF states to make an intermittent supplying of gas to a mixer 29 is not generated, a constant speed rotation of a gas engine 26 is kept and then an output frequency of a generator 30 is accurately kept at the predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas regulator for supplying fuel gas to a gas engine that drives, for example, a generator or the like.

(Prior Art) As is well known, a conventional pilot type gas regulator has a configuration as shown in FIG. That is, a main diaphragm 52 that drives a valve 51 for controlling the gas pressure on the outlet side, a subchamber 53 for controlling this main diaphragm 52, and a subchamber 53 are partitioned by a control diaphragm 54. a control chamber 55 into which pilot pressure is introduced; and a control diaphragm 54 disposed in this control chamber 55.
a control spring 5 that urges the
6, and the boost pressure was introduced into the control chamber 55 as pilot pressure from, for example, a turbocharger of a gas engine.

(Problems to be Solved by the Invention) However, in the conventional configuration described above, when used for supplying fuel gas to a gas engine, hunting occurs due to a delay in response of the gas regulator due to the influence of the mounting position of the gas regulator. This causes rotational fluctuations in the gas engine. This hunting is likely to occur when the gas flow rate is low, and fluctuations in the rotation of a gas engine due to hunting are a particular problem in gas engines used to drive generators that require constant rotation performance. This problem becomes even more problematic when multiple generators are operated synchronously.

(Means for Solving the Problems) In order to solve the above problems, the gas regulator of the present invention includes a main diaphragm that drives a valve for controlling gas pressure on the outlet side, and a sub-diaphragm for controlling the main diaphragm. A control chamber partitioned by a control diaphragm between the chamber and the auxiliary chamber and into which pilot pressure is introduced, and a control spring disposed in the control chamber to bias the control diaphragm toward the auxiliary chamber. In the pilot type gas regulator, an accumulator is connected to a spring case forming the control chamber, the inside of the accumulator and the control chamber are separated by a plug, and the plug connects the inside of the accumulator and the control chamber. A throttle hole is provided for communication, and by appropriately selecting the volume of the accumulator and the diameter of the throttle hole, pressure fluctuations in the control chamber are attenuated and hunting is prevented.

(Function) Since the control chamber communicates with the accumulator through the throttle hole of the plug, pressure fluctuations in the control chamber due to fluctuations in pilot pressure are attenuated. Therefore, by appropriately selecting the volume of the accumulator and the diameter of the throttle hole, it is possible to obtain an appropriate damping rate and prevent hunting from occurring.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 is a sectional view of a gas regulator according to an embodiment of the present invention. Inside the casing 2 of the gas regulator 1, as is well known, there is a main valve 3 for controlling the gas pressure on the outlet side. A diaphragm 4, a subchamber 5 for controlling the main diaphragm 4, and a subchamber 5 for controlling the main diaphragm 4.
A control chamber 7 partitioned by a control diaphragm 6 and into which pilot pressure is introduced, and a control spring 8 disposed in the control chamber 7 to bias the control diaphragm 6 toward the auxiliary chamber 5 are provided. It is being

The main diaphragm 4 includes a diaphragm rod 10
1, and is urged upward in FIG. 1 by a main spring 11. The main diaphragm 4 and the valve 3 are connected via a lever 12, and the lever 12 converts vertical displacement of the main diaphragm 4 into horizontal displacement of the valve 3. gas is space 1
3, the pressure is regulated by the valve 3, and the space 14
It is derived from The space 14 is an inlet vibe 15
The sub-chamber 5 communicates with the space 17 via the loading vibe 16. Pilot pressure is introduced into the control chamber 7 from a pilot pressure introduction port 18 .

The above configuration is similar to that of a well-known pilot type gas regulator, and next, the characteristic configuration of the present invention will be explained. A spring case 20 that accommodates the control spring 8 and forms the control chamber 7 has an open bottom end and is connected to an accumulator 21, and a plug 22 is provided at the connection between the spring case 20 and the accumulator 21. installed. The plug 22 partitions the control chamber 7 and the inside of the accumulator 21, and is formed with a throttle hole 23 that allows communication between the control chamber 7 and the inside of the accumulator 21.

FIG. 2 is a schematic configuration diagram of the gas regulator 1 in use, in which 26 is a gas engine, 27 is a governor of the gas engine 26,
28 is a turbocharger of the gas engine 26, 29 is a mixer of the gas engine 26, and 30 is a generator driven by the gas engine 26, and the output of this generator 30 is used in parallel with the commercial power source.

The space 13 of the gas regulator 1 is connected to a gas supply source (not shown) via a pipe 31. The mixer 29
The gas inlet of the mixer 29 and the compressed air outlet of the turbocharger 28 communicate with each other via a pipe 32, and the air inlet of the mixer 29 and the compressed air outlet of the turbocharger 28 communicate with each other via a pipe 33. Also turbocharger 2
The compressed air outlet 8 communicates with the pilot pressure inlet 18 of the gas regulator 1 via a pipe 34. The gas engine 26 is, for example, a V-type two-cylinder engine, and two mixers 29 are provided corresponding to each cylinder as shown in FIG. 3, and the pipe 32 has a branch pipe 32a and a branch pipe 32b. It is branched into.

Next, the effect will be explained. The gas regulator 1 basically functions in the same manner as a conventional pilot type gas regulator, but since the control chamber 7 and the accumulator 21 communicate through the throttle hole 23 of the plug 22, the control chamber 7 is attenuated. Therefore, the turbocharger 2 as pilot pressure
Even if the boost pressure in control room 7 fluctuates rapidly,
fluctuations in internal pressure are alleviated. As a result, even when the gas flow rate led out from the space 14 is small, the so-called hunting phenomenon in which the valve 3 is repeatedly turned on and off and the supply of gas to the two mixers is interrupted does not occur, and the gas engine 26 is maintained at a steady state. The high speed rotation is maintained, and the output frequency of the generator 30 is maintained accurately at a predetermined value.

Note that the capacity of the accumulator 21 and the diameter of the throttle hole 23 are determined through experiments after the gas engine 26, gas regulator 1, etc. are installed. That is, the gas engine 26, gas regulator 1, etc. are installed after the spring case 20 is installed.
A variable capacity accumulator is attached to the plug 22, and a plug 22 having a throttle hole 23 of an appropriate diameter is attached, and the gas engine 26 is operated to drive the generator 30. Then, while checking the degree of hunting, the capacity of the accumulator is changed, and for each capacity, the plug 22 is replaced and the diameter of the throttle hole 23 is changed. In this way, the accumulator capacity and throttle hole 23 minimize the occurrence of hunting.
The hole diameter is determined, and an accumulator 21 having that capacity and a plug 22 having a throttle hole 23 having that hole diameter are attached to the spring case 20.

(Another Embodiment) FIG. 4 shows another embodiment, in which two gas regulators 1 may be used corresponding to two mixers 29. In this way, the range of the gas regulator 1 can be made smaller compared to the case shown in FIG.

(Effects of the Invention) As explained above, according to the present invention, there is provided a main diaphragm that drives a valve for controlling the gas pressure on the outlet side, a subchamber for controlling the main diaphragm, and a subchamber for controlling the main diaphragm. A pilot-type gas regulator comprising: a control chamber partitioned by a control diaphragm into which pilot pressure is introduced; and a control spring disposed in the control chamber to urge the control diaphragm toward the auxiliary chamber. , an accumulator is connected to a spring case forming the control chamber, the inside of the accumulator and the control chamber are partitioned by a plug, and the plug is provided with a throttle hole that communicates the inside of the accumulator with the control chamber, By appropriately selecting the volume of the accumulator and the diameter of the throttle hole, the structure is designed to attenuate pressure fluctuations in the control chamber and prevent hunting, so the gas flow rate can be controlled regardless of the installation position of the gas regulator. Hunting can be effectively prevented even when the amount is low. Therefore, when used for supplying fuel gas to a gas engine, for example, even if the gas regulator cannot be placed near the gas engine, hunting can be effectively prevented from occurring and the rotational speed of the gas engine can always be kept constant.

For this reason, it is very effective for gas engines for driving generators where constant rotation characteristics are important, and particularly when a plurality of generators are operated synchronously in a plurality of gas engines.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a gas regulator in an embodiment of the present invention, Fig. 2 is a schematic configuration diagram of the gas regulator in use, and Fig. 3 is an actual connection state between the gas regulator and the generator in Fig. 2. FIG. 4 is an explanatory diagram of a connection state between a gas regulator and a generator in another embodiment, and FIG. 5 is a sectional view of a conventional gas regulator. 3... Valve, 4... Main diaphragm, 5...
- Subchamber, 6... Control diaphragm, 7...
Control room, 8... Control spring, 2
0... Spring case, 21... Accumulator, 22... Plug, 23... Throttle hole Patent applicant Yanmar Diesel Co., Ltd. 861

Claims (1)

[Claims] 1. A control diaphragm separates the main diaphragm that drives the valve for controlling the gas pressure on the outlet side, the auxiliary chamber for controlling the main diaphragm, and the auxiliary chamber into which pilot pressure is introduced. In the pilot type gas regulator, the accumulator is connected to a spring case forming the control chamber. , the inside of the accumulator and the control chamber are partitioned by a plug, the plug is provided with a throttle hole that communicates the inside of the accumulator with the control chamber, and the volume of the accumulator and the diameter of the throttle hole are adjusted appropriately. A gas regulator characterized in that the gas regulator is configured to attenuate pressure fluctuations in the control chamber and prevent hunting by selecting the gas regulator.