PROSOFT MVI56E-MCM 開發(fā)模塊
當(dāng)調(diào)速器適應(yīng)這種類型的發(fā)動機(jī)時，如果連桿是線性的，則在怠速和輕負(fù)載下的操作永遠(yuǎn)不會很穩(wěn)定。使調(diào)速器適應(yīng)帶蝶形閥的發(fā)動機(jī)的正確程序是使連桿機(jī)構(gòu)，使其在輕負(fù)載下每增加一次蝶形運(yùn)動，就需要比在高負(fù)載下更大的調(diào)速器運(yùn)動。這種連接傾向于使發(fā)動機(jī)產(chǎn)生的扭矩和調(diào)速器輸出軸位置之間的關(guān)系線性化（見圖1-4）。下表顯示了蝶閥不同開度下調(diào)速器輸出軸的令人滿意的角位置，以便在怠速和輕負(fù)荷下更穩(wěn)定地運(yùn)行。表5-1。調(diào)速器輸出軸行程與蝶閥行程
調(diào)速器空轉(zhuǎn)一兩分鐘，然后停止發(fā)動機(jī)并排空調(diào)速器。再次沖洗調(diào)速器。給調(diào)速器重新加油（請參閱第2章“供油”）。重新啟動發(fā)動機(jī)并重置補(bǔ)償調(diào)整和針閥。6.檢查調(diào)速器的驅(qū)動裝置是否正確對齊，且沒有粗糙度、側(cè)面負(fù)載和過大的齒隙。啟動發(fā)動機(jī)、渦輪機(jī)或其他類型的原動機(jī)時，要做好緊急停機(jī)的準(zhǔn)備，以防止失控或超速，從而可能造成人身傷害、生命損失或財產(chǎn)損失。蒸汽輪機(jī)、燃?xì)夂推桶l(fā)動機(jī)的附加信息蒸汽輪機(jī)的發(fā)動機(jī)扭矩與節(jié)氣門位置之間存在各種非線性關(guān)系。每種類型都必須使用正確的補(bǔ)償連桿進(jìn)行補(bǔ)償，以使調(diào)速器輸出軸運(yùn)動與原動機(jī)扭矩輸出恢復(fù)到接近線性的關(guān)系。有關(guān)正確的連桿選擇和安裝，請參閱原動機(jī)制造商手冊。通過蝶閥控制的燃?xì)饣蚱桶l(fā)動機(jī)的扭矩與節(jié)氣門位置的曲線總是非常非線性的。
Governor Field Repairs Replacement of output shaft and drive shaft seals and bearings can be done in the field. Refer to Figures 5-1 and 5-2 and to Tables 5-3 and 5-4 for a listing of common bench tools and normal field repair tools. These tools are not considered to be essential. They do, however, make replacement of seals and bearings more convenient. Tools can be ordered from Woodward. See Chapter 8 for contact information. Include the following information: ? The tool description. ? The tool number or part number of the tool required. ? The manual number (this is manual 03036). Removal of Governor from Engine To replace a governor on the engine, or to replace seals or bearings on the governor, remove the governor from the engine as follows: Use care in handling and resting the governor on the work area. Do not strike or rest the governor on the end of the drive shaft as damage may result to the drive shaft, oil seal, bearing, or other internal parts or surfaces. Set the governor on wooden block(s) to protect the drive shaft when performing any maintenance operation. 1. Drain oil from the governor and install the drain plug again. Some governors are equipped with a drain cock for draining. 2. Clean exterior surfaces using a cloth moistened with cleaning solvent. 3. Disconnect auxiliary device wiring and pneumatic or hydraulic tubing connections if applicable.
Please refer to the prime mover manufacturer’s handbook for the correct linkage selection and installation. The torque vs. throttle position curve for a gas or gasoline engine which is controlled through a butterfly valve is always very non-linear. When adapting a governor to this type of engine, If the linkage is made linear, operation at idle and light loads is never very stable. The proper procedure for adapting a governor to this engine with the butterfly valve is to make the linkage so that it requires greater movement of the governor per increment of butterfly movement at light loads than it does at high loads. This linkage tends to linearize the relation between engine developed torque and governor output shaft position (see Figure 1-4). The chart below shows a satisfactory angular position of the governor output shaft for different openings of the butterfly valve in order to have a more stable operation at idle and at light loads. Table 5-1. Governor Output Shaft Travel vs. Butterfly Valve Travel
Let the governor hunt for a minute or two, then stop the engine and drain the governor. Flush the governor once again. Refill the governor with oil (see Chapter 2, Oil Supply). Restart the engine and reset the compensation adjustment and needle valve. 6. Check that the drive to the governor Is correctly aligned and free of roughness, side loading, and excessive backlash. Be prepared to make an emergency shutdown when starting the engine, turbine, or other type of prime mover, to protect against runaway or overspeed with possible personal injury, loss of life, or property damage. Additional Information for Steam Turbines, Gas and Gasoline Engines The engine torque versus throttle position for a steam turbine gives a wide variety of non-linear relations. Each type must be compensated for with the correct compensating linkage to bring the governor output shaft movement back Into a near linear relation with the prime mover torque output.