JP2864357B2 - Roots pump for sewage - Google Patents
Roots pump for sewageInfo
- Publication number
- JP2864357B2 JP2864357B2 JP7132780A JP13278095A JP2864357B2 JP 2864357 B2 JP2864357 B2 JP 2864357B2 JP 7132780 A JP7132780 A JP 7132780A JP 13278095 A JP13278095 A JP 13278095A JP 2864357 B2 JP2864357 B2 JP 2864357B2
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- roots
- sewage
- cutter
- pump
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/126—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/126—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sewage (AREA)
- Rotary Pumps (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、汚泥曝気処理場等で使
用される汚水用ルーツポンプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root pump for sewage used in a sludge aeration plant.
【０００２】[0002]
【従来の技術】従来の汚泥曝気処理場等において濃縮汚
泥の循環又はその回収装置に使用されるポンプとして、
本発明者に係る自吸式ルーツポンプが特公昭４４−１１
３４５号に記載されて知られている。そのポンプは、自
吸水性能に優れると共に、キャビテーションやサージン
グ現象による不快音を抑制減少するものであった。2. Description of the Related Art As a pump used in a conventional sludge aeration plant or the like to circulate or collect concentrated sludge,
The self-priming roots pump according to the present inventors is disclosed in Japanese Patent Publication No. 44-11 / 1973.
No. 345 is known. The pump has excellent self-priming performance and suppresses and reduces unpleasant noise due to cavitation and surging.
【０００３】[0003]
【発明が解決しようとする課題】ところが、前記ポンプ
を比較的濃度の高い汚水に使用して毎分１０００〜１５
００回転程度の高速運転を行うと、キャビテーションの
現象やローターの凹円弧部と凸円弧部との間に水が閉じ
込められるいわゆる閉じ込み現象が生じるため、騒音や
振動が大きくなって円滑な運転を行うことができない。
また、汚水に混入する毛屑や長い繊維等の夾雑物が、軸
封作用を行うメカニカルシール部分に侵入してこれに巻
き付くという不具合が発生することもある。このため、
このポンプは通常毎分１０００回転未満、真空度３５０
mmHg以下で運転されており、前述の高速運転を行うには
不向きであった。However, the above pump is used for relatively concentrated sewage, and is used for 1000 to 15 minutes per minute.
When high-speed operation of about 00 rotations is performed, a phenomenon of cavitation and a so-called trapping phenomenon in which water is trapped between the concave arc portion and the convex arc portion of the rotor occur, so that noise and vibration increase and smooth operation is performed. Can't do it.
Further, there may be a problem that foreign matters such as shavings and long fibers mixed into the sewage invade the mechanical seal portion performing the shaft sealing action and wrap around the mechanical seal portion. For this reason,
The pump is typically operated at less than 1000 revolutions per minute and a vacuum of 350
It was operated at mmHg or less, and was not suitable for performing the aforementioned high-speed operation.
【０００４】よって、この発明は従来ポンプの性能を改
善するために、下記の課題を解決することを目的とする
ものである。高真空度（400〜650mmHg）が得られて、キ
ャビテーションを可及的に抑制すること高速(1000〜150
0rpm)運転を可能にすることローター間に水を閉じ込む
現象による振動を減少することメカニカルシール部分に
毛屑等の夾雑物が巻き付かないようにすることAccordingly, an object of the present invention is to solve the following problems in order to improve the performance of a conventional pump. High vacuum (400-650mmHg) is obtained and cavitation is suppressed as much as possible.
(0rpm) Enable operation Reduce vibration caused by water trapping between rotors Prevent foreign matter such as shavings from wrapping around mechanical seals
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に請求項１に記載の発明は、吸込口と吐出口とを設けた
ケーシング内に一対の３葉ルーツロータを装着し、該ル
ーツローターのローター軸をケーシングの両側に固定さ
れたハウジングで回転自由に支持した汚水用ルーツポン
プにおいて、前記３葉ルーツロータはローターの形状に
模して一体に形成された芯金部材にゴムライニング加工
を施され、該ローターの各凹円弧部にキャビテーション
を防止するための小径の連通口を設け、さらに前記３葉
ルーツロータの各側面に、凹凸状のカッター部が外周に
形成されたカッター板を固定し、前記ハウジングの内周
面と該カッター板のカッター部とに少しの間隙を設けて
ケーシング内に混入する夾雑物を破断するように構成し
たことを特徴とする。In order to achieve the above object, according to the first aspect of the present invention, a pair of three-lobe roots rotors is mounted in a casing provided with a suction port and a discharge port. In a sewage roots pump in which a rotor shaft is rotatably supported by a housing fixed to both sides of a casing, the three-leaf roots rotor is provided with a rubber lining on a cored member integrally formed in the shape of a rotor. A small-diameter communication port for preventing cavitation is provided in each concave arc portion of the rotor;
Concavo-convex cutter parts on the outer periphery on each side of the roots rotor
Fixing the formed cutter plate, the inner circumference of the housing
With a slight gap between the surface and the cutter part of the cutter plate
It is designed to break up foreign substances mixed in the casing.
Characterized in that was.
【０００６】[0006]
【作用】このルーツポンプは、３葉ルーツロータの回転
によって汚水を吸込口から吐出口側に吐出する公知の作
動をするものである。そこで、毎分１０００〜１５００
回転程度の高速運転が行なわれると、ケーシングにほぼ
接するルーツローターの凸円弧部の背面（吸込）側に局
部的に真空部が生じて液中から一部のガスが分離される
共に、その前面（吐出）側において、同様に発生したガ
スが圧縮されて局部的に圧縮作用部が生ずる。この時、
従来のルーツポンプではキャビテーションが発生して衝
撃音と振動が起きるところ、本発明のルーツポンプで
は、圧力の高い吐出側の一部の汚水が連通口を通って低
圧力の吸込側に還流するので局部的真空部が消滅する。
このため、キャビテーションの現象が殆ど生じない。ま
た、ローターの凹円弧部と凸円弧部との間に閉じ込めら
れた水は、連通口を通って吸込側に還流するので、前述
した閉じ込み現象が緩和されて閉じ込みによる振動が減
少する。 This roots pump performs a known operation of discharging sewage from a suction port to a discharge port side by rotation of a three-lobe roots rotor. Therefore, 1000 to 1500 per minute
When a high-speed operation of about rotation is performed, a vacuum portion is locally formed on the back (suction) side of the convex arc portion of the roots rotor almost in contact with the casing, so that a part of gas is separated from the liquid and the front surface thereof is separated. On the (discharge) side, similarly generated gas is compressed to locally generate a compression action portion. At this time,
In a conventional roots pump, where cavitation occurs and an impulsive sound and vibration occur, in the roots pump of the present invention, some wastewater on the high-pressure discharge side returns to the low-pressure suction side through the communication port. The local vacuum disappears.
Therefore, the cavitation phenomenon hardly occurs. Further, the water confined between the concave arc portion and the convex arc portion of the rotor flows back to the suction side through the communication port, so that the above-described confinement phenomenon is alleviated and vibration due to confinement is reduced.
【０００７】汚水に混入する毛屑や長い繊維等の夾雑物
は、カッター板のカッター部とハウジングの内周面との
間隙に挟まれて破断され、汚水と共に外部に排出され
る。一部の破片はハウジング室に入って滞留するが、滞
留回転中にカッター部でさらに細かくされ、低圧側の吸
込作用によってケーシング内に再び戻されて汚水と共に
外部に排出される。このため、軸封メカニカルシール部
分には毛屑等の夾雑物が巻き付きにくい。Impurities such as shavings and long fibers mixed into the wastewater are broken by being caught in the gap between the cutter portion of the cutter plate and the inner peripheral surface of the housing, and are discharged to the outside together with the wastewater. Some of the debris enters the housing chamber and stays there, but is further fined by the cutter during the staying rotation, and is returned to the casing again by suction on the low-pressure side, and is discharged to the outside together with the waste water. For this reason, foreign substances such as shavings do not easily wind around the shaft sealing mechanical seal portion.
【０００８】[0008]
【実施例】以下に、本発明の一実施例を図面に基づいて
説明する。図１は汚水用ルーツポンプの縦断正面図、図
２は同ルーツローターの中心部を縦断した一部の側面
図、図３は図２のＡ−Ａ線断面図、図４は衝撃音の測定
値を示すグラフ、図５は振動の測定値を示すグラフであ
る。An embodiment of the present invention will be described below with reference to the drawings. 1 is a vertical sectional front view of a roots pump for sewage, FIG. 2 is a side view of a part of the roots rotor taken through a central portion thereof, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a graph showing measured values of vibration.
【０００９】図１、２に示されている汚水用ルーツポン
プｐは、吸込口２と吐出口３とを設けたケーシング１内
に一対の３葉ルーツロータ（以下、ルーツローターと略
称することもある）１０が収められて、ケーシング１の
両側に固定されたハウジング４、５で密封状に装着さ
れ、該ルーツロータ１０のローター軸１１の両端をハウ
ジング４、５に固定したベアリング６によって回転自由
に支持するようにされている。また、一方のハウジング
５から突出するローター軸１１には、それぞれタイミン
グギヤ７を固定して該タイミングギヤ７を噛合させ、他
方のハウジング４から突出するローター軸１１にプーリ
ー（図示せず）を取り付けて別途モーターにより駆動す
るように構成する。８はダイヤフラム式メカニカルシー
ルを示し、ハウジング４、５側に嵌着した固定体８ａと
ローター軸１１に固定した回転体８ｂとで軸封作用を行
わせるものである。A roots pump p for sewage shown in FIGS. 1 and 2 has a pair of three-lobe roots rotors (hereinafter sometimes abbreviated as roots rotors) in a casing 1 provided with a suction port 2 and a discharge port 3. ) 10 are housed in a sealed manner with housings 4 and 5 fixed to both sides of the casing 1, and both ends of the rotor shaft 11 of the roots rotor 10 are rotatably supported by bearings 6 fixed to the housings 4 and 5. Have been to be. Further, a timing gear 7 is fixed to the rotor shaft 11 protruding from the one housing 5 to mesh with the timing gear 7, and a pulley (not shown) is attached to the rotor shaft 11 protruding from the other housing 4. Separately driven by a motor. Reference numeral 8 denotes a diaphragm type mechanical seal, in which a fixed body 8a fitted to the housings 4 and 5 and a rotating body 8b fixed to the rotor shaft 11 perform shaft sealing.
【００１０】３葉ルーツロータ１０は、ローターの形状
に模して適宜位置に空隙部分を形成して一体とした芯金
部材１２を設け、この芯金部材１２の空隙部分と表面に
ゴムライニング加工Ｌを施され、図３に示す通常の外観
形態に加工されている。前記芯金部材１２は外周部分１
３の重量を軽くして中心部分１４に重量を多く集中させ
ることにより、良好な回転バランスをとると共に剛性を
持たせるように構成する。また、ルーツローター１０の
１２０゜間隔に配置された各凸円弧部１５間の凹円弧部
１６には、キャビテーション及び閉じ込み現象を防止す
るための小径の連通口１７を軸心に向かって穿設し、各
連通口１７間を接続する。連通口１７はローターの軸方
向位置に適宜数設けるものとし、その大きさは汚水用ル
ーツポンプｐの口径により異なるが５〜１５ｍｍの範囲
とする。The three-leaf roots rotor 10 is provided with a core member 12 integrally formed by forming a gap at an appropriate position in a shape of a rotor, and a rubber lining L is formed on the gap and the surface of the core 12. And processed into the normal appearance shown in FIG. The core metal member 12 has an outer peripheral portion 1.
By reducing the weight of 3 and concentrating much of the weight on the central portion 14, a good rotational balance and rigidity are provided. A small-diameter communication port 17 for preventing cavitation and trapping is formed in the concave arc 16 between the convex arcs 15 arranged at 120 ° intervals of the roots rotor 10 toward the axis. Then, the communication ports 17 are connected. The number of the communication ports 17 is appropriately provided at the axial position of the rotor, and the size thereof is in the range of 5 to 15 mm depending on the diameter of the sewage roots pump p.
【００１１】前記３葉ルーツロータ１０の各側面１８の
中心位置には、凹凸状のカッター部２１が外周に連続し
て形成された硬質ゴム又は金属材料からなるリング形の
カッター板２０をボルト２２で固定する。そのカッター
板２０の正面の凹部２３には、前記ダイヤフラム式メカ
ニカルシール８の回転体８ｂの一端が挿入されている。
前記ハウジング４、５の内周面４ａ、５ａと該カッター
部２１の先端とに少しの間隙ｃを設け、ハウジング室９
の入口位置でケーシング１内に混入する毛屑等の夾雑物
を破断するように構成する。At the center of each side surface 18 of the three-leaf roots rotor 10, a ring-shaped cutter plate 20 made of hard rubber or a metal material having an uneven cutter portion 21 formed continuously on the outer periphery is bolted 22. Fix it. One end of a rotating body 8b of the diaphragm type mechanical seal 8 is inserted into a concave portion 23 on the front surface of the cutter plate 20.
A small gap c is provided between the inner peripheral surfaces 4a and 5a of the housings 4 and 5 and the tip of the cutter portion 21 so that the housing chamber 9
At the inlet position of the casing 1 to break off impurities such as shavings mixed into the casing 1.
【００１２】つぎに、汚水用ルーツポンプｐの作動につ
いて説明する。３葉ルーツロータ１０の回転によって汚
水を吸込口２から吐出口３側に吐出する作用は、公知の
ルーツポンプと同様である。そこで、毎分１０００〜１
５００回転程度の高速運転が行なわれると、図３に示す
ようにケーシング１の内周にほぼ接するルーツローター
１０の凸円弧部１５の背面（吸込）側に局部的に真空部
が生じて液中から一部のガスが分離される。これと同時
期に、凸円弧部１５の前面（吐出）側において、同様に
発生したガスが圧縮されて局部的に圧縮作用部が生ず
る。この時、従来のルーツポンプではキャビテーション
が発生して衝撃音と振動が発生していた。しかし、この
ルーツポンプｐでは、圧力の高い吐出側の一部の汚水が
矢印で示すように連通口１７を通って低圧力の吸込側に
還流するので局部的真空部が消滅する。このため、キャ
ビテーションの現象が回避される。また、ルーツロータ
ー１０の凹円弧部１６と凸円弧部１５との間に閉じ込め
られた水は、連通口１７を通って吸込側に還流するの
で、前述した水を閉じ込む現象が緩和されて閉じ込みに
よる振動が著しく減少する。Next, the operation of the sewage roots pump p will be described. The operation of discharging sewage from the suction port 2 to the discharge port 3 side by the rotation of the three-leaf roots rotor 10 is the same as that of a known roots pump. Therefore, 1000-1
When a high-speed operation of about 500 rotations is performed, a vacuum portion is locally formed on the back (suction) side of the convex arc portion 15 of the roots rotor 10 almost in contact with the inner periphery of the casing 1 as shown in FIG. Is separated from the gas. At the same time, on the front surface (discharge) side of the convex arc portion 15, similarly generated gas is compressed to locally generate a compression acting portion. At this time, in the conventional roots pump, cavitation was generated and an impulsive sound and vibration were generated. However, in this roots pump p, a part of the sewage on the discharge side with a high pressure flows back to the suction side with a low pressure through the communication port 17 as shown by the arrow, so that the local vacuum part disappears. For this reason, the cavitation phenomenon is avoided. Further, the water trapped between the concave arc portion 16 and the convex arc portion 15 of the roots rotor 10 returns to the suction side through the communication port 17, so that the above-described phenomenon of trapping water is alleviated and the water is closed. Vibration due to intrusion is significantly reduced.
【００１３】また、汚水に毛屑や長い繊維等の夾雑物が
混入している場合には、その夾雑物は、カッター板２０
のカッター部２１とハウジング４、５の内周面４ａ、５
ａとの間隙ｃに挟まれて破断され、汚水と共に外部に排
出される。一部の破片はハウジング室９に入って滞留す
るが、滞留回転中にカッター部２１でさらに細かくさ
れ、低圧側の吸込作用によってケーシング１内に再び戻
されて汚水と共に外部に排出される。このため、ダイヤ
フラム式メカニカルシール８の部分には、毛屑等の夾雑
物が巻き付きにくい。[0013] Further, when foreign substances such as shavings and long fibers are mixed in the sewage, the foreign substances are removed by the cutter plate 20.
Cutter section 21 and inner peripheral surfaces 4a, 5a of housings 4, 5
It is broken by being caught in the gap c with the a and discharged to the outside together with the sewage. Some of the debris enters the housing chamber 9 and stays there. However, during the staying rotation, the fragments are further refined by the cutter unit 21, returned to the casing 1 again by the suction operation on the low pressure side, and discharged to the outside together with the sewage. For this reason, foreign substances, such as shavings, do not easily wind around the diaphragm type mechanical seal 8.
【００１４】図４、５に本発明の汚水用ルーツポンプと
従来のルーツポンプとを毎分１０００回転で真空度を３
００〜６５０mmHgに変化させて運転した場合における、
キャビテーション及び閉じ込み現象による衝撃音と振動
値の測定結果を示す。使用したポンプは何れも出力３．
７Ｋｗ、吸込口径５０ｍｍのものである。衝撃音（運転
に伴う騒音を含む）は、各ポンプから１ｍ離れたところ
で騒音計により測定し、振動値は軸受部分の振動を振動
センサーで測定したものである。これによれば、衝撃音
は約１０〜１８dB程度低下しており、振動値は約４〜１
３μｍ程度低下していることが実験により確認された。FIGS. 4 and 5 show that the roots pump for sewage of the present invention and the conventional roots pump have a degree of vacuum of 3 at 1000 rpm.
In the case of driving while changing to 00 to 650 mmHg,
The measurement result of the impact sound and vibration value by a cavitation and confinement phenomenon is shown. The output of each pump used is 3.
7 Kw, 50 mm suction port diameter. The impulsive sound (including the noise due to operation) was measured by a sound level meter at a distance of 1 m from each pump, and the vibration value was obtained by measuring the vibration of the bearing portion with a vibration sensor. According to this, the impact sound is reduced by about 10 to 18 dB, and the vibration value is about 4 to 1 dB.
It was confirmed by an experiment that the height was reduced by about 3 μm.
【００１５】[0015]
【発明の効果】本発明は上述した構成・作用になるもの
であり、圧力の高い吐出側の一部の汚水が連通口を通っ
て低圧力の吸込側に還流するためにキャビテーションの
現象が抑制され、かつローターの凹円弧部と凸円弧部と
の間に閉じ込められる水が、連通口を通って吸込側に還
流するために、いわゆる閉じ込み現象が緩和されて振動
が減少する等の顕著な効果を奏する。従って、騒音が抑
制された円滑な運転が行われ、従来より高真空度・高速
回転で運転することも可能となる。さらに、汚水に混入
する毛屑や長い繊維等の夾雑物は、カッター板のカッタ
ー部で破断されるので、メカニカルシール部分に毛屑等
の夾雑物が巻き付きにくいという利益を有する。The present invention has the above-described structure and operation, and the cavitation phenomenon is suppressed because a part of the sewage on the discharge side with a high pressure is returned to the suction side with a low pressure through the communication port. Water confined between the concave arc portion and the convex arc portion of the rotor returns to the suction side through the communication port, so that the so-called confinement phenomenon is alleviated and vibration is reduced. It works. Therefore, a smooth operation in which noise is suppressed is performed, and it is possible to operate at a higher degree of vacuum and a higher rotation speed than before. Furthermore, impurities such as shavings and long fibers mixed in the sewage are broken at the cutter portion of the cutter plate, so that there is an advantage that the impurities such as shavings do not easily wind around the mechanical seal portion.
【図１】汚水用ルーツポンプの縦断正面図FIG. 1 is a longitudinal sectional front view of a sewage roots pump.
【図２】同ルーツローターの中心部を縦断した一部の側
面図FIG. 2 is a side view of a portion of the roots rotor taken through a central portion thereof.
【図３】図２のＡ−Ａ線断面図FIG. 3 is a sectional view taken along line AA of FIG. 2;
【図４】衝撃音の測定値を示すグラフFIG. 4 is a graph showing a measured value of an impact sound.
【図５】振動の測定値を示すグラフFIG. 5 is a graph showing measured values of vibration.
ｐ→汚水用ルーツポンプ ｃ→間隙 Ｌ→ゴムライニン
グ加工 １→ケーシング ２→吸込口 ３→吐出口 ４、５→ハ
ウジング ４ａ、５ａ→内周面 ９→ハウジング室 １０→３葉ル
ーツロータ １１→ローター軸 １２→芯金部材 １３→外周部分
１４→中心部分 １５→凸円弧部 １６→凹円弧部 １７→連通口 １８
→側面 ２０→カッター板 ２１→カッター部p → Roots pump for sewage c → Gap L → Rubber lining processing 1 → Casing 2 → Suction port 3 → Discharge port 4,5 → Housing 4a, 5a → Inner peripheral surface 9 → Housing room 10 → 3 leaf roots rotor 11 → Rotor shaft 12 → core metal member 13 → outer peripheral part 14 → central part 15 → convex circular arc part 16 → concave circular arc part 17 → communication port 18
→ Side 20 → Cutter plate 21 → Cutter
Claims (1)
に一対の３葉ルーツロータを装着し、該ルーツローター
のローター軸をケーシングの両側に固定されたハウジン
グで回転自由に支持した汚水用ルーツポンプにおいて、
前記３葉ルーツロータはローターの形状に模して一体に
形成された芯金部材にゴムライニング加工を施され、該
ローターの各凹円弧部にキャビテーションを防止するた
めの小径の連通口を設け、さらに前記３葉ルーツロータ
の各側面に、凹凸状のカッター部が外周に形成されたカ
ッター板を固定し、前記ハウジングの内周面と該カッタ
ー板のカッター部とに少しの間隙を設けてケーシング内
に混入する夾雑物を破断するように構成したことを特徴
とする汚水用ルーツポンプ。1. A sewage roots in which a pair of three-leaf roots rotors are mounted in a casing provided with a suction port and a discharge port, and a rotor shaft of the roots rotor is rotatably supported by housings fixed to both sides of the casing. In the pump,
The three-leaf roots rotor is provided with a rubber lining process on a core metal member integrally formed in a shape of a rotor, and a small-diameter communication port for preventing cavitation is provided in each concave arc portion of the rotor. The three-leaf roots rotor
Each side has a cutter with an uneven cutter formed on the outer periphery.
Fixing the inner plate of the housing and the cutter.
-With a small gap between the plate and the cutter
Roots pump for sewage, characterized in that it is configured to break up foreign substances mixed in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7132780A JP2864357B2 (en) | 1995-05-02 | 1995-05-02 | Roots pump for sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7132780A JP2864357B2 (en) | 1995-05-02 | 1995-05-02 | Roots pump for sewage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08303355A JPH08303355A (en) | 1996-11-19 |
| JP2864357B2 true JP2864357B2 (en) | 1999-03-03 |
Family
ID=15089381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7132780A Expired - Fee Related JP2864357B2 (en) | 1995-05-02 | 1995-05-02 | Roots pump for sewage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2864357B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870522A (en) * | 2009-04-24 | 2010-10-27 | 株式会社安来特 | Fine bubble generating apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012087663A (en) * | 2010-10-19 | 2012-05-10 | Anlet Co Ltd | Six-blade biaxial rotary displacement pump |
| CN112727672A (en) * | 2021-02-01 | 2021-04-30 | 四川智恒合创科技有限公司 | Gear shaft for hydraulic driving system |
-
1995
- 1995-05-02 JP JP7132780A patent/JP2864357B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870522A (en) * | 2009-04-24 | 2010-10-27 | 株式会社安来特 | Fine bubble generating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08303355A (en) | 1996-11-19 |
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