羅茨鼓風(fēng)機結構：羅茨鼓風(fēng)機結構

　　Roots blower structure: Roots blower structure

　　羅茨鼓風(fēng)機有兩種:立式(A型或L型)和臥式(B型或W型)。羅茨的兩個(gè)轉子中心在同一個(gè)垂直平面上，進(jìn)風(fēng)口和出風(fēng)口分別在鼓風(fēng)機兩側，即立式。兩個(gè)轉子中心在同一平面內，進(jìn)氣口在鼓風(fēng)機下座的一側，出風(fēng)口在鼓風(fēng)機上方，或者進(jìn)氣口在鼓風(fēng)機上方，出風(fēng)口在鼓風(fēng)機下座的一側，即臥式。

　　There are two types of Roots blowers: vertical (type A or L) and horizontal (type B or W). The two rotor centers of Roots are on the same vertical plane, with the inlet and outlet located on either side of the blower, which is vertical. The centers of the two rotors are in the same plane, with the air inlet on one side of the lower seat of the blower and the air outlet above the blower, or the air inlet above the blower and the air outlet on one side of the lower seat of the blower, that is, horizontal.

　　羅茨鼓風(fēng)機一般由主軸、從動(dòng)軸、∞葉輪(2)、外殼、前墻板、后墻板、齒輪軸、軸承等主要部件。

　　Roots blower generally consists of main shaft, driven shaft, ∞ impeller (2), housing, front wall panel, rear wall panel, gear shaft, bearings and other main components.

　　大多數小型羅茨鼓風(fēng)機都是垂直結構，即外殼是一個(gè)整體結構，兩側結合一塊墻板。為了方便轉子間隙的拆卸和調整，大型羅茨鼓風(fēng)機選擇水平分割的水平結構，即外殼，墻板分為兩部分。

　　Most small Roots blowers have a vertical structure, where the casing is a monolithic structure with a wall panel on both sides. For the convenience of disassembling and adjusting the rotor clearance, a large Roots blower adopts a horizontally divided structure, that is, the shell and wall panel are divided into two parts.

　　對于一般運輸氣體、水煤氣、二氧化碳氣體等介質(zhì)的羅茨鼓風(fēng)機，其殼體、墻板、葉輪等部件均采用高韌性灰鑄鐵，主從動(dòng)軸為45鋼。在運輸易燃、易爆、腐蝕性強的介質(zhì)時(shí)，其殼體、墻板、葉輪和一些易與介質(zhì)接觸的部件由銅、鋁合金、不銹鋼、鈦合金等材料制成。

　　For Roots blowers used for general transportation of gases, water gas, carbon dioxide gas and other media, their shell, wall panels, impellers and other components are made of high toughness gray cast iron, and the main and secondary shafts are made of 45 steel. When transporting flammable, explosive, and highly corrosive media, the shell, wall panels, impeller, and some components that are easily in contact with the media are made of materials such as copper, aluminum alloy, stainless steel, titanium alloy, etc.

　　殼體和墻板剛度好，在人體表面和底部有合理的加強筋。殼體和墻板有自然蒸發(fā)冷卻（空氣冷卻）和墻板有自然蒸發(fā)冷卻（空氣冷卻）和冷卻水（水冷卻）兩種結構。由于鼓風(fēng)機的排氣溫度隨鼓風(fēng)機吸入氣體的溫度和排氣壓力而變化，排氣壓力大于49kPa鼓風(fēng)機采用水冷結構；低于49kPa鼓風(fēng)機采用空冷結構。

　　The shell and wall panels have good rigidity and reasonable reinforcement ribs on the surface and bottom of the human body. The shell and wall panels have two structures: natural evaporative cooling (air cooling) and wall panels have natural evaporative cooling (air cooling) and cooling water (water cooling). Due to the fact that the exhaust temperature of the blower varies with the temperature and exhaust pressure of the gas inhaled by the blower, the blower adopts a water-cooled structure when the exhaust pressure is greater than 49kPa; The blower below 49kPa adopts an air-cooled structure.

　　墻板在殼體兩側，墻板內安裝密封件，軸承座作為鼓風(fēng)機支撐，與殼體結合形成封閉氣缸。對于A(yíng)型鼓風(fēng)機，墻板采用整體結構，軸承座和密封在同一整體結構中；對于B型鼓風(fēng)機，墻板采用組合結構，即墻板分為上下兩部分，下部分為一部分，上部分為兩部分，密封與軸承座分開(kāi)，分離部分暴露在空間中。運輸易腐蝕介質(zhì)時(shí)，如果上述兩種結構采用相同的密封結構，密封性差，腐蝕介質(zhì)從泄漏到空間，不直接進(jìn)入軸承。因此，后一種結構軸承腐蝕損壞緩慢，相對軸承壽命長(cháng)；前者直接進(jìn)入軸承，損壞大，使用壽命短。

　　The wall panels are installed on both sides of the shell, with seals installed inside. The bearing seat serves as a support for the blower and is combined with the shell to form a closed cylinder. For Type A blower, the wall panel adopts an integral structure, with the bearing seat and seal in the same integral structure; For B-type blower, the wall panel adopts a combination structure, that is, the wall panel is divided into upper and lower parts, with the lower part being one part and the upper part being two parts. The seal and bearing seat are separated, and the separated part is exposed in the space. When transporting corrosive media, if the above two structures use the same sealing structure, the sealing performance is poor, and the corrosive medium leaks into the space without directly entering the bearing. Therefore, the latter type of structural bearing has slow corrosion damage and relatively long bearing life; The former directly enters the bearing, causing significant damage and a short service life.

　　小羅茨鼓風(fēng)機主從軸左側選用雙向心球面球軸承，大中型鼓風(fēng)機選用雙向心球面滾子軸承，右側齒輪端選用單向心短圓柱滾子軸承。

　　The left side of the main and secondary shafts of the small Roots blower uses bidirectional spherical ball bearings, while large and medium-sized blowers use bidirectional spherical roller bearings. The right gear end uses unidirectional short cylindrical roller bearings.

　　羅茨鼓風(fēng)機的齒輪副一般由45鋼制成。齒輪副是一對齒輪軸，也是一對定時(shí)齒輪。鼓風(fēng)機的兩個(gè)葉輪在兩個(gè)齒輪角一致的前提下才能正常運行。否則，兩個(gè)葉輪會(huì )發(fā)生碰撞，破壞鼓風(fēng)機的正常運行，甚至導致設備事故。從動(dòng)軸上的齒輪副大多制成齒輪圈和齒輪輪轂組合件，葉輪之間的間隙可以通過(guò)調整從動(dòng)齒輪圈來(lái)實(shí)現。設計齒輪側隙時(shí)，應注意不要大于或等于兩個(gè)葉輪的齒合間隙。當齒輪側隙大于葉輪間隙的2/3時(shí)，兩個(gè)葉輪在運行時(shí)會(huì )敲打。在這種情況下，需要更新或重新調整兩個(gè)嚙合齒輪。

　　The gear pair of Roots blower is generally made of 45 steel. A gear pair is a pair of gear shafts and also a pair of timing gears. The two impellers of the blower can only operate normally when the two gear angles are consistent. Otherwise, the two impellers may collide, disrupting the normal operation of the blower and even causing equipment accidents. The gear pairs on the driven shaft are mostly made into gear rings and gear hub assemblies, and the clearance between the impellers can be achieved by adjusting the driven gear rings. When designing the gear backlash, care should be taken not to be greater than or equal to the meshing clearance between the two impellers. When the gear clearance is greater than 2/3 of the impeller clearance, the two impellers will knock during operation. In this case, it is necessary to update or readjust the two meshing gears.

　　羅茨鼓風(fēng)機的齒輪潤滑，如流量小、壓力低、速度低，一般采用封閉式油箱，主軸端用軸盤(pán)濺潤滑齒輪。如果是大流量、高壓、高速，大多采用電動(dòng)油泵進(jìn)行潤滑。

　　The gear lubrication of Roots blower, such as low flow rate, low pressure, and low speed, generally uses a closed oil tank, and the main shaft end uses a shaft disc to splash lubricate the gear. If it is high flow, high pressure, or high speed, electric oil pumps are mostly used for lubrication.

　　鼓風(fēng)機軸端密封結構一般為框架橡膠油封，每組密封由兩個(gè)或三個(gè)頂框架橡膠油封組成。其中兩個(gè)背面安裝在與運輸介質(zhì)接觸的內部，另一個(gè)安裝在外部，中間注入潤滑脂。整個(gè)密封件安裝在一個(gè)密封外套中，形成一個(gè)組件。運輸易燃、易爆、強腐蝕、有毒等有害氣體時(shí)，軸端密封采用機封。但機封的尺寸精度和裝配精度要求較高，工藝成本也較高。

　　The sealing structure of the blower shaft end is generally a frame rubber oil seal, and each set of seals consists of two or three top frame rubber oil seals. Two of them are installed on the inside in contact with the transport medium, while the other is installed on the outside with lubricating grease injected in the middle. The entire seal is installed in a sealing jacket to form a component. When transporting flammable, explosive, highly corrosive, toxic and other harmful gases, machine seals are used for shaft end sealing. But the dimensional accuracy and assembly accuracy requirements of the machine seal are high, and the process cost is also high.

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