JPH0730931Y2 - Gas pressure detector for gas engine - Google Patents
Gas pressure detector for gas engineInfo
- Publication number
- JPH0730931Y2 JPH0730931Y2 JP8514189U JP8514189U JPH0730931Y2 JP H0730931 Y2 JPH0730931 Y2 JP H0730931Y2 JP 8514189 U JP8514189 U JP 8514189U JP 8514189 U JP8514189 U JP 8514189U JP H0730931 Y2 JPH0730931 Y2 JP H0730931Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pressure
- fuel gas
- engine
- gas pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000007789 gas Substances 0.000 claims description 76
- 239000002737 fuel gas Substances 0.000 claims description 46
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 description 12
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案はガスエンジンに供給される燃料ガスの圧力を検
出する装置に係り、特に燃料ガス圧力の脈動の影響を受
けないようにしたガスエンジン用ガス圧力検出装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for detecting the pressure of fuel gas supplied to a gas engine, and particularly to a gas engine which is not affected by the pulsation of the fuel gas pressure. The present invention relates to a gas pressure detector.
一般に、ガスエンジンでコンプレッサーを駆動し、フロ
ンを媒体として冷暖房を行うガスエンジンピートポンプ
においては、常時、燃料ガスの圧力を検出し、燃料ガス
圧力が低下した時にはガスエンジンを停止させるように
している。In general, in a gas engine peat pump that drives a compressor in a gas engine to perform cooling and heating using chlorofluorocarbon as a medium, the pressure of the fuel gas is constantly detected, and the gas engine is stopped when the fuel gas pressure decreases. .
すなわち、ガスエンジンが起動されると、ガスエンジン
の回転数およびサイクル数によって燃料ガス圧力は変動
し、最悪の場合には負圧になることがある。運転時、ガ
スエンジン吸入口の燃料ガス圧力は第４図のような波形
を示し、この波形はガスエンジンから離れるに従い減衰
していく。またサイクル数が少ないほど脈動幅が大き
く、回転数により脈動の周期がきまる。That is, when the gas engine is started, the fuel gas pressure fluctuates depending on the number of revolutions and the number of cycles of the gas engine, and in the worst case, the fuel gas pressure may become negative. During operation, the fuel gas pressure at the gas engine inlet shows a waveform as shown in FIG. 4, and this waveform decays as the distance from the gas engine increases. Further, the smaller the number of cycles, the larger the pulsation width, and the pulsation cycle is determined by the number of revolutions.
燃料ガス供給元から前記ガスエンジンを含む複数の需要
先にガスが供給されており、ガスエンジン以外のガス需
要先での燃料ガス需要量が増加して供給元の燃料ガス圧
力が低下すると、前述のような燃料ガス圧力の脈動があ
る場合、ガスエンジンが燃料ガスを吸引する形となって
他の需要先での燃料ガス使用が不可能になることが予想
される。このため、供給側の燃料ガス圧力があらかじめ
定められたある一定圧力以下になった場合、ガスエンジ
ンを停止させるための装置が必要となる。When the gas is supplied from the fuel gas supply source to a plurality of demand destinations including the gas engine, and the fuel gas demand amount at gas demand destinations other than the gas engine increases and the fuel gas pressure at the supply source decreases, When there is such a pulsation of the fuel gas pressure, it is expected that the gas engine will suck the fuel gas and the fuel gas cannot be used in other demand destinations. Therefore, a device for stopping the gas engine is required when the fuel gas pressure on the supply side becomes lower than a predetermined constant pressure.
このような装置として、第２図に示すように、ガスエン
ジン５に接続されたガス供給管１に電磁弁2,3とガス圧
力調整器４を設けるとともに、ガス供給管１の端部に枝
管６を設け、燃料ガス圧力を検出する圧力センサ８を枝
管６に直接固定したものが知られている。As such a device, as shown in FIG. 2, a solenoid valve 2, 3 and a gas pressure regulator 4 are provided in a gas supply pipe 1 connected to a gas engine 5 and a branch is provided at an end of the gas supply pipe 1. It is known that a pipe 6 is provided and a pressure sensor 8 for detecting the fuel gas pressure is directly fixed to the branch pipe 6.
また、第３図に示すように、枝管６にオリフィス９を設
け、このオリフィス９を介して圧力センサ８で燃料ガス
圧力を検出するようにしたものも知られている。Further, as shown in FIG. 3, it is also known that the branch pipe 6 is provided with an orifice 9 and the pressure sensor 8 detects the fuel gas pressure through the orifice 9.
しかしながら、上記従来技術のうち、圧力センサを枝管
に直接固定したものでは、ガスエンジンの運転状態に伴
って変化する燃料ガス圧力の脈動が圧力センサに作用し
てしまう欠点がある。すなわち、燃料ガス圧力には、第
４図に示すように、ガスエンジンの回転数に合致した脈
動が発生し、この脈動が直接に圧力センサの受圧板に作
用するため、圧力センサの設定圧力に狂いが生じ易く、
圧力センサの寿命を縮めてしまうという問題がある。However, among the above-mentioned conventional techniques, in the case where the pressure sensor is directly fixed to the branch pipe, there is a drawback that the pulsation of the fuel gas pressure that changes according to the operating state of the gas engine acts on the pressure sensor. That is, as shown in FIG. 4, a pulsation that matches the rotational speed of the gas engine occurs in the fuel gas pressure, and this pulsation directly acts on the pressure receiving plate of the pressure sensor. Madness is likely to occur,
There is a problem that the life of the pressure sensor is shortened.
また、オリフィスを介して圧力センサを固定したもので
は、オリフィスの内径が極めて小さいので、配管内のゴ
ミ、切り屑等が詰まり易く、しかも内径の小さいオリフ
ィスを製造するのは容易なことではない。Further, in the case where the pressure sensor is fixed via the orifice, since the inner diameter of the orifice is extremely small, dust, chips and the like in the pipe are likely to be clogged, and it is not easy to manufacture an orifice having a small inner diameter.
本考案の目的は、長期間に亘って燃料ガス圧力を安定し
て検出でき、かつ圧力センサの寿命を長くすることがで
きるガスエンジン用ガス圧力検出装置を提供することで
ある。An object of the present invention is to provide a gas pressure detection device for a gas engine, which can stably detect the fuel gas pressure for a long period of time and can extend the life of the pressure sensor.
上記目的を達成するために、本考案のガスエンジン用ガ
ス圧力検出装置は、ガスエンジンに燃料ガスを供給する
ガス供給管とガスエンジンの排気ガスを外部へ排出する
排気管とを、途中がダイヤフラムで遮断された枝管で接
続するとともに、燃料ガスと排気ガスの圧力波形の位相
差が前記ダイヤフラムの位置で180度となるよう前記枝
管の内容積を設定し、かつ前記ガス供給管側の枝管上で
前記ダイヤフラムの近傍に燃料ガス圧力を検出する圧力
検出手段を設けたものである。In order to achieve the above object, a gas pressure detecting device for a gas engine according to the present invention comprises a gas supply pipe for supplying a fuel gas to the gas engine and an exhaust pipe for discharging exhaust gas of the gas engine to the outside, and a diaphragm in the middle. Connected by a branch pipe blocked by, the internal volume of the branch pipe is set so that the phase difference between the pressure waveforms of the fuel gas and the exhaust gas is 180 degrees at the position of the diaphragm, and the gas supply pipe side Pressure detecting means for detecting the fuel gas pressure is provided on the branch pipe near the diaphragm.
上記構成によれば、ガスエンジンが起動されると、燃料
ガス圧力と排気ガス圧力がそれぞれ枝管を介してダイヤ
フラム両面に作用する。このとき、燃料ガス圧力には脈
動が発生するが、燃料ガス圧力の波形と排気ガス圧力の
波形はダイヤフラムの所で位置が互いに180度ずれるた
め、両圧力は干渉し合い、圧力検出手段には平滑化され
た正の圧力が作用する。このようにして、圧力検出手段
に作用する燃料ガス圧力から脈動を取り除くことが可能
となる。According to the above configuration, when the gas engine is started, the fuel gas pressure and the exhaust gas pressure act on both sides of the diaphragm via the branch pipes. At this time, pulsation occurs in the fuel gas pressure, but the positions of the fuel gas pressure waveform and the exhaust gas pressure waveform deviate from each other by 180 degrees at the diaphragm, so the two pressures interfere with each other and the pressure detection means A smoothed positive pressure acts. In this way, the pulsation can be removed from the fuel gas pressure acting on the pressure detecting means.
以下に本考案の一実施例を図面に従って説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は本考案のガスエンジン用ガス圧力検出装置の全
体構成を示している。図において、ガスエンジン５の上
流側には、ガスエンジン５に燃料ガスを供給するガス供
給管１が接続され、このガス供給管１の端部にガス入口
継手15が取付けられている。ガス供給管１には、燃料ガ
スの通路を、開閉するための電磁弁2,3と、燃料ガスの
圧力を一定に保持するためのガス圧力調整器４とが設け
られている。またガスエンジン５の下流側には、排気ガ
スを排出する排気管13が接続されている。FIG. 1 shows the overall structure of a gas pressure detecting device for a gas engine of the present invention. In the figure, a gas supply pipe 1 for supplying a fuel gas to the gas engine 5 is connected to the upstream side of the gas engine 5, and a gas inlet joint 15 is attached to an end of the gas supply pipe 1. The gas supply pipe 1 is provided with electromagnetic valves 2 and 3 for opening and closing the passage of the fuel gas, and a gas pressure regulator 4 for keeping the pressure of the fuel gas constant. An exhaust pipe 13 that discharges exhaust gas is connected to the downstream side of the gas engine 5.
ガス入口継手15と電磁弁２との間のガス供給管１には枝
管10が、排気管13の途中には枝管11がそれぞれ接続さ
れ、枝管10と枝管11はダイヤフラム12を介して連結され
ている。また燃料ガスと排気ガスの圧力波形の位相が互
いにダイヤフラム12の位置で180度ずれるように、枝管1
0と枝管11の内容積が設定されている。さらに枝管10の
途中（ダイヤフラム12の近傍）には枝管６を介して圧力
センサ８（半導体圧力センサ又は機械式圧力スイッチ）
が固定されている。A branch pipe 10 is connected to the gas supply pipe 1 between the gas inlet joint 15 and the solenoid valve 2, and a branch pipe 11 is connected in the middle of the exhaust pipe 13, and the branch pipe 10 and the branch pipe 11 are connected via a diaphragm 12. Are linked together. In addition, the branch pipe 1 is arranged so that the phases of the pressure waveforms of the fuel gas and the exhaust gas are shifted from each other by 180 degrees at the position of the diaphragm 12.
0 and the inner volume of the branch pipe 11 are set. Further, a pressure sensor 8 (semiconductor pressure sensor or mechanical pressure switch) is provided in the middle of the branch pipe 10 (near the diaphragm 12) via the branch pipe 6.
Is fixed.
次に本実施例の作用について説明する。Next, the operation of this embodiment will be described.
ガスエンジン５が停止している時には、燃料ガス圧力は
一定値であるが、ガスエンジン５が起動されると燃料ガ
ス圧力には脈動が発生し、その燃料ガス圧力は枝管10を
介してダイヤフラム12の一方の面に作用する。同時に排
気ガス圧力は枝管11を介してダイヤフラム12の他方の面
に作用する。このとき、燃料ガス圧力の波形と排気ガス
圧力の波形はダイヤフラム12の所で位相が互いに180度
ずれるため、燃料ガス圧力と排気ガス圧力は干渉し合
い、圧力センサ８には平滑化された正の燃料ガス圧力、
すなわち脈動が取り除かれた燃料ガス圧力を作用させる
ことができる。When the gas engine 5 is stopped, the fuel gas pressure has a constant value, but when the gas engine 5 is started, pulsation occurs in the fuel gas pressure, and the fuel gas pressure passes through the branch pipe 10 and the diaphragm. Acts on one side of 12. At the same time, the exhaust gas pressure acts on the other surface of the diaphragm 12 via the branch pipe 11. At this time, since the waveform of the fuel gas pressure and the waveform of the exhaust gas pressure are 180 degrees out of phase with each other at the diaphragm 12, the fuel gas pressure and the exhaust gas pressure interfere with each other, and the pressure sensor 8 has a smoothed positive waveform. Fuel gas pressure,
That is, the fuel gas pressure from which pulsation has been removed can be applied.
本実施例によれば、構成が非常に簡単であるから、安い
製造コストでガスエンジン用ガス圧検出装置を得ること
ができる。According to this embodiment, since the structure is very simple, it is possible to obtain the gas pressure detecting device for a gas engine at a low manufacturing cost.
以上説明したように、本考案によれば、排気ガス圧力と
の差圧を利用して燃料ガス圧力を検出するようにしてい
るので、圧力検出手段にゴミ等の異物が入り込むことが
なく、ガスエンジンの燃料ガス圧力を長期間に亘って安
定して検出することができる。As described above, according to the present invention, the fuel gas pressure is detected by utilizing the differential pressure from the exhaust gas pressure, so that foreign matter such as dust does not enter the pressure detection means, The fuel gas pressure of the engine can be detected stably over a long period of time.
また、燃料ガス圧力の脈動を取り除くことができるた
め、圧力検出手段の寿命を長くすることが可能である。Further, since the pulsation of the fuel gas pressure can be removed, the life of the pressure detecting means can be extended.
さらに、燃料ガスと排気ガスの圧力波形を干渉させるよ
うにしているので、ガスエンジンを停止させるときの燃
料ガス圧力を所定値に正確に設定することができる。Further, since the pressure waveforms of the fuel gas and the exhaust gas are made to interfere with each other, the fuel gas pressure when stopping the gas engine can be accurately set to a predetermined value.
第１図は本考案のガスエンジン用ガス圧力検出装置の全
体構成図、第２図と第３図は従来のガスエンジン用ガス
圧力検出装置の全体構成図、第４図は燃料ガスの脈動状
態を示す説明図である。 １…ガス供給管、2,3…電磁弁、４…ガス圧力調整器、
５…ガスエンジン、6,10,11…枝管、12…ダイヤフラ
ム、13…排気管、15…ガス入口継手。FIG. 1 is an overall configuration diagram of a gas pressure detecting device for a gas engine of the present invention, FIGS. 2 and 3 are overall configuration diagrams of a conventional gas pressure detecting device for a gas engine, and FIG. 4 is a pulsating state of fuel gas. FIG. 1 ... Gas supply pipe, 2, 3 ... Solenoid valve, 4 ... Gas pressure regulator,
5 ... Gas engine, 6, 10, 11 ... Branch pipe, 12 ... Diaphragm, 13 ... Exhaust pipe, 15 ... Gas inlet joint.
Claims (1)
給管とガスエンジンの排気ガスを外部へ排出する排気管
とを、途中がダイヤフラムで遮断された枝管で接続する
とともに、燃料ガスと排気ガスの圧力波形の位相差が前
記ダイヤフラムの位置で180度となるよう前記枝管の内
容積を設定し、かつ前記ガス供給管側の枝管上で前記ダ
イヤフラムの近傍に燃料ガス圧力を検出する圧力検出手
段を設けたガスエンジン用ガス圧力検出装置。1. A gas supply pipe for supplying a fuel gas to a gas engine and an exhaust pipe for discharging the exhaust gas of the gas engine to the outside are connected by a branch pipe which is interrupted by a diaphragm, and the fuel gas and the exhaust gas are connected. The internal volume of the branch pipe is set so that the phase difference of the gas pressure waveform is 180 degrees at the position of the diaphragm, and the fuel gas pressure is detected in the vicinity of the diaphragm on the branch pipe on the gas supply pipe side. A gas pressure detection device for a gas engine provided with pressure detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8514189U JPH0730931Y2 (en) | 1989-07-20 | 1989-07-20 | Gas pressure detector for gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8514189U JPH0730931Y2 (en) | 1989-07-20 | 1989-07-20 | Gas pressure detector for gas engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0323641U JPH0323641U (en) | 1991-03-12 |
| JPH0730931Y2 true JPH0730931Y2 (en) | 1995-07-19 |
Family
ID=31634098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8514189U Expired - Fee Related JPH0730931Y2 (en) | 1989-07-20 | 1989-07-20 | Gas pressure detector for gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730931Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012096379A1 (en) | 2011-01-14 | 2012-07-19 | ヤンマー株式会社 | Gas engine system with detection function of abnormality occurrence of gas pressure detection mechanism |
-
1989
- 1989-07-20 JP JP8514189U patent/JPH0730931Y2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012096379A1 (en) | 2011-01-14 | 2012-07-19 | ヤンマー株式会社 | Gas engine system with detection function of abnormality occurrence of gas pressure detection mechanism |
| JP2012145076A (en) * | 2011-01-14 | 2012-08-02 | Yanmar Co Ltd | Gas engine system with detection function of abnormality occurrence of gas pressure detection mechanism |
| US9181911B2 (en) | 2011-01-14 | 2015-11-10 | Yanmar Co., Ltd. | Gas engine system with detection function of abnormality occurrence of gas pressure detection mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0323641U (en) | 1991-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |