1、 Working principle of Roots blower

羅茨風機是一種容積式回轉高壓風機，以發(fā)明人美國羅茨兄弟的姓氏命名。羅茨風機有兩個轉子，在電機帶動下，兩個轉子會相向轉動，當轉子轉過進氣口之后，兩個轉子和墻板及機殼之間會形成一個密封的腔室，轉子繼續(xù)轉動，密封腔室里面的空氣會被壓入排氣口，如此反復經過進氣口和排氣口，可以不斷地將外界空氣吸入又排出。兩轉子相互之間、兩轉子與機殼及側蓋板之間，既要保證相互不發(fā)生碰撞，又要保證不因間隙過大影響效率。兩轉子運轉中始終保持微小間隙，使排出的氣體盡量不返回進氣室。

Roots blower is a positive displacement rotary high-pressure blower, named after the inventor of the American Roots Brothers. Roots blower has two rotors. Driven by the motor, the two rotors will rotate in opposite directions. When the rotor rotates through the air inlet, a sealed chamber will be formed between the two rotors, the wall panel and the casing. The rotor continues to rotate, and the air in the sealed chamber will be pressed into the exhaust port. In this way, the outside air can be continuously inhaled and discharged through the air inlet and exhaust port repeatedly. Between the two rotors, between the two rotors and the casing and the side cover plate, it is necessary to ensure that there is no collision with each other and that the efficiency is not affected by excessive clearance. Keep a small gap between the two rotors during operation, so that the exhaust gas will not return to the inlet chamber as much as possible.

其特點為輸出的風量與回轉數(shù)成正比，當風機出口壓力變化時，輸送的風量并沒有顯著變化。羅茨風機有較高的壓強，壓力在一百千帕以下時，效率遠超空壓機，用途非常廣泛，是污水處理、氣力輸送、曝氣增氧重要氣源設備。

Its characteristic is that the output air volume is proportional to the rotation number. When the fan outlet pressure changes, the delivered air volume does not change significantly. Roots blower has a high pressure. When the pressure is below 100 kPa, its efficiency is far higher than that of air compressor. It has a wide range of uses. It is an important air source equipment for sewage treatment, pneumatic transmission, aeration and oxygenation.

二、羅茨風機常見的故障類型

2、 Common fault types of Roots blower

根據(jù)我們錦工多年維修經驗總結，羅茨鼓風機故障的常見原因主要包括斷軸、軸承損壞、機組振動大、轉子卡死、軸封泄漏等等。

According to our years of maintenance experience, the common causes of roots blower failures mainly include broken shaft, bearing damage, large unit vibration, rotor seizure, shaft seal leakage, etc.

1、羅茨風機故障原因分析

1. Cause Analysis of Roots Blower Failure

轉子與機殼或轉子間摩擦是羅茨鼓風機的常見問題，若在運轉中顯示此問題，可能有著比較嚴重的機械振動與噪音。羅茨鼓風機經過較長時間停機后，頻頻出現(xiàn)葉輪卡澀的現(xiàn)象，錦工風機把問題的主要原因梳理為以下幾大類。

Friction between rotor and casing or between rotors is a common problem of Roots blower. If this problem is shown during operation, there may be serious mechanical vibration and noise. After the Roots blower has been shut down for a long time, the impeller jam frequently occurs. The main causes of the problem are classified into the following categories.

（1）轉子分葉、合葉間隙有問題

(1) There is a problem with the clearance of rotor split and hinge

轉子的分葉、合葉間隙有問題，運轉中分葉、合葉間隙發(fā)生改變。兩轉子在低速轉動的時候會出現(xiàn)撞擊，導致轉子間摩擦甚卡阻。

There is a problem with the clearance between the split and hinge of the rotor, and the clearance between the split and hinge changes during operation. Two rotors will collide when rotating at low speed, resulting in friction and even jamming between rotors.

一旦運轉中出現(xiàn)此機械故障，會使兩轉子間或轉子與機殼出現(xiàn)撞擊，發(fā)出強力的撞擊聲；產生振動變大，甚能引起基礎產生振動；同時摩擦部位溫度在短時間內升高，甚出現(xiàn)機殼發(fā)熱燒紅現(xiàn)象。

Once this mechanical failure occurs during operation, it will make the two rotors collide with each other or with the casing, making a strong impact sound; The vibration will become larger, and even cause the foundation to vibrate; At the same time, the temperature of the friction part increases in a short time, and even the case is hot and red.

（2）軸承損壞

(2) Bearing damage

風機運行工況差、油封損壞、裝配間隙超標等都會導致軸承損壞，而軸承損壞會造成溫度升高，軸承座溫度也會增加，嚴重時會使軸承座變形。

Poor fan operating conditions, oil seal damage, excessive assembly clearance, etc. will cause bearing damage, while bearing damage will cause temperature rise, bearing seat temperature will also increase, and in serious cases, the bearing seat will be deformed.

特別是軸承內外圈抱死時，軸承座與側蓋板受到較大的額外力，溫度也會很高，軸承座與側蓋板受熱不均，嚴重時造成側蓋板變形，出現(xiàn)裂紋。

Especially when the inner and outer rings of the bearing are locked, the bearing seat and the side cover plate will be subjected to a large amount of extra force, and the temperature will also be very high. The bearing seat and the side cover plate will be heated unevenly, which will cause the side cover plate to deform and crack in serious cases.

軸徑磨損，使軸與軸承內圈間隙過大，軸承座磨損使軸承座與軸承外圈間隙過大，都會造成轉子卡澀或摩擦。特別是皮帶連接的風機，主動軸由于受皮帶拉力的作用，致使軸承座單向受力較大，容易出現(xiàn)皮帶側主動軸的軸承座單邊磨損。

The wear of the shaft diameter causes excessive clearance between the shaft and the bearing inner race, and the wear of the bearing seat causes excessive clearance between the bearing seat and the bearing outer race, which will cause the rotor to jam or friction. Especially for the fan connected by the belt, the driving shaft is subject to the action of the belt tension, resulting in a large one-way force on the bearing seat, which is prone to unilateral wear of the bearing seat of the driving shaft on the belt side.

（3）齒輪磨損

(3) Gear wear

齒輪磨損，齒輪側間隙增大，將造成兩轉子位置發(fā)生變化，使主動轉子與從動轉子之間合葉間隙變小、分葉間隙增大，引起兩轉子互相碰撞、摩擦。

Gear wear and gear side clearance increase will cause the position of the two rotors to change, which will reduce the clearance between the driving rotor and the driven rotor and increase the clearance between the lobes, causing the two rotors to collide and rub with each other.

（4）轉子或殼體變形

(4) Deformation of rotor or housing

如果轉子或者殼體變形，會使轉子外徑與機殼的間隙過小，造成轉子摩擦和卡澀。

If the rotor or housing is deformed, the clearance between the outer diameter of the rotor and the housing will be too small, resulting in friction and jamming of the rotor.

轉子端面與側蓋板間隙小

Small clearance between rotor end face and side cover plate

如果轉子與側蓋板間隙過小，有雜物擠進轉子與側蓋板間；或軸向定位軸承磨損后，轉子的軸向竄量變大，都造成轉子與側蓋板發(fā)生摩擦，引起轉子卡澀。

If the clearance between the rotor and the side cover plate is too small, there are sundries squeezed between the rotor and the side cover plate; Or after the axial positioning bearing is worn, the axial displacement of the rotor becomes larger, which causes friction between the rotor and the side cover plate, causing the rotor to jam.

2、羅茨風機故障處理方式

2. Troubleshooting of Roots blower

（1）調節(jié)分合葉間隙

(1) Adjust the clearance of the split blade

用塞尺檢查轉子分、合葉間隙值，使其在標準范圍內。檢查調節(jié)間隙的背帽與螺栓，保證其完好性。

Use a feeler gauge to check the clearance value of rotor split and hinge to make it within the standard range. Check the back cap and bolt for adjusting the clearance to ensure its integrity.

要求：分葉間隙占總間隙的 1/3，但不小于 0.15mm；合葉間隙占總間隙的 2/3，且要大于齒輪側隙 1.5 倍。

Requirements: the split clearance accounts for 1/3 of the total clearance, but not less than 0.15mm; Hinge clearance accounts for 2/3 of the total clearance and is 1.5 times larger than the gear side clearance.

合葉為主動轉子的嚙合面向被動轉子有靠近的趨勢；分葉為主動轉子的嚙合面向被動轉子有遠離的趨勢。若轉子分、合葉間隙不合適，可調整齒套與輪轂或齒輪與軸的周向相對角度。

The meshing face of the active rotor is close to the passive rotor; The meshing face of the active rotor is far away from the passive rotor. If the clearance between the rotor split and hinge blades is not appropriate, the circumferential relative angle between the gear sleeve and the hub or between the gear and the shaft can be adjusted.

轉子分葉、合葉的調整是羅茨風機檢修的關鍵部分，直接決定著檢修質量的好壞。不同類型的羅茨風機，有不同的調節(jié)形式。軸與齒輪為錐型無鍵連接時，一般通過調節(jié)軸與齒輪周向相對位置；軸與齒輪為鍵連接時，一般通過調節(jié)從動齒輪與輪轂的相對位置。

The adjustment of rotor blades and hinges is the key part of Roots blower maintenance, which directly determines the quality of maintenance. Different types of Roots fans have different adjustment forms. When the shaft and gear are connected in a tapered keyless way, the relative circumferential position of the shaft and gear is generally adjusted; When the shaft and gear are keyed, the relative position between the driven gear and the hub is generally adjusted.

風機正常運轉過程中，隨著齒輪磨損，間隙都會地發(fā)生變化，其中合葉間隙趨向減小，分葉間隙趨向增大。在調整兩葉輪的工作間隙時，應預先將合葉間隙適當調大，一般合葉間隙是分葉間隙的 2 倍。

During the normal operation of the fan, the clearance will change with the wear of the gear. The clearance of the hinge tends to decrease and the clearance of the split tends to increase. When adjusting the working clearance of the two impellers, the hinge clearance should be appropriately increased in advance. Generally, the hinge clearance is 2 times of the split clearance.

葉輪間隙調整時，將葉片轉到與水平方向呈 45° 的位置，此時兩葉輪的間隙即為分葉或合葉間隙。

When adjusting the impeller clearance, first turn the blade to a position 45 ° from the horizontal direction. At this time, the clearance between the two impellers is the split or combined blade clearance.

現(xiàn)場調節(jié)時，一般用同樣厚度的塞尺固定在兩轉子間，并將兩轉子固定，再裝入主動齒輪，并將從動齒輪的標記對準主動齒的標記壓入軸上，依次裝上齒輪擋圈，止動墊圈和緊固螺帽。調整好后再用塞尺測量分葉間隙與合葉間隙的實際大小，如不合適重新調整，直到符合標準。

During field adjustment, generally use a feeler gauge of the same thickness to fix between the two rotors, fix the two rotors, and then install the driving gear, align the mark of the driven gear with the mark of the driving gear and press it onto the shaft, and then install the gear retainer ring, stop washer and fastening nut in turn. After adjustment, use a feeler gauge to measure the actual size of the split clearance and the hinge clearance. If it is not suitable, readjust it until it meets the standard.

（2）更換軸承

(2) Replace bearing

檢查側蓋板是否變形有裂紋。變形不嚴重，可打磨高點；變形嚴重則更換側蓋板；如有裂紋，可進行補焊。

Check whether the side cover plate is deformed or cracked. The deformation is not serious, and the high point can be polished; If the deformation is serious, replace the side cover plate; If there are cracks, repair welding can be carried out.

檢查軸承座與軸徑是否磨損。如果軸磨損，一般進行補焊；如果軸承座磨損，單獨的軸承座一般更換新件，不進行修理；軸承座與側蓋板為一體時，則補焊軸承座，使其配合間隙達到技術要求。

Check whether the bearing seat and shaft diameter are worn. If the shaft is worn, repair welding is generally carried out; If the bearing seat is worn, the separate bearing seat is generally replaced with a new one without repair; When the bearing seat and the side cover plate are integrated, the bearing seat shall be repaired and welded to make its fit clearance meet the technical requirements.

（3）檢查齒側間隙，更換齒輪

(3) Check the backlash and replace the gear

用紅丹粉檢查齒輪嚙合部位的接觸面積。檢查齒側間隙的方法有打表法、塞尺法、壓鉛絲法。

Check the contact area of the gear engagement part with red lead powder. The methods of checking the backlash at the tooth side include marking method, feeler gauge method and pressing lead wire method.

標準要求：側隙 0.10~0.18mm、嚙合部位在齒面中部，齒表接觸面積沿齒高方向不小于 50%，沿齒寬方向不小于 70%。若檢測結果不符合要求，需更換齒輪。

Standard requirements: the backlash is 0.10~0.18mm, the meshing part is in the middle of the tooth surface, the contact area of the tooth surface is not less than 50% along the direction of the tooth height, and not less than 70% along the direction of the tooth width. If the test results do not meet the requirements, the gear needs to be replaced.

（4）用塞尺測量轉子與殼體的間隙

(4) Measure the clearance between rotor and housing with feeler gauge

轉子與殼體間隙的標準范圍為 0.3~0.6 mm?，F(xiàn)場檢修時一般測量 6 點間隙，每個轉子的上下與水平方向，如圖所示。

The standard range of clearance between rotor and shell is 0.3~0.6 mm. During on-site maintenance, generally measure the clearance at 6 points, the upper and lower and horizontal directions of each rotor, as shown in the figure.

變形較小可以進行打磨處理；變形較大或轉子與殼體出現(xiàn)裂紋，應及時報廢。

Small deformation can be polished; In case of large deformation or cracks in rotor and shell, it shall be scrapped in time.

（5）清理轉子端面與側蓋板

(5) Clean the rotor end face and side cover plate

用塞尺法檢測轉子端面與機殼的軸向間隙。定位端（ 齒輪側）間隙d=0.1~0.2 mm，非定位端（ 皮帶輪側）間隙c=0.3~0.5 mm，總間隙的標準是 0.4~0.7mm。

Use the feeler gauge method to measure the axial clearance between the rotor end face and the casing. The clearance at the locating end (gear side) d=0.1~0.2 mm, the clearance at the non-locating end (pulley side) c=0.3~0.5 mm, and the standard of the total clearance is 0.4~0.7 mm.

不同類型的羅茨風機在不同工況下端隙不同，現(xiàn)場檢修時按各自檢修標準調整。若單側間隙不合適，可通過加、減軸承調整墊片調整；若總間隙不合適，可通過加、減側蓋板結合面的調整墊片調整，但墊片厚度一般不超過 1mm。用推軸法測量轉子的軸向竄量，竄量標準 0.05~0.10mm， 若超過標準值的 1.5 倍，則更換軸承。

The end clearance of different types of Roots fans is different under different working conditions, and shall be adjusted according to their respective maintenance standards during on-site maintenance. If the unilateral clearance is not appropriate, it can be adjusted by adding or removing bearing adjusting shims; If the total clearance is not appropriate, it can be adjusted by adding or removing the adjusting shims on the joint surface of the side cover plate, but the thickness of the shims generally does not exceed 1mm. Measure the axial displacement of the rotor with the shaft pushing method. The displacement standard is 0.05~0.10mm. If it exceeds 1.5 times the maximum value of the standard, replace the bearing.

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