JP2007262925A

JP2007262925A - Oil supplying channel of oil-cooled screw compressor

Info

Publication number: JP2007262925A
Application number: JP2006086107A
Authority: JP
Inventors: Katsu Kaneko; 克金子; Naoyuki Yaginuma; 直幸柳沼
Original assignee: Hokuetsu Industries Co Ltd
Current assignee: Hokuetsu Industries Co Ltd
Priority date: 2006-03-27
Filing date: 2006-03-27
Publication date: 2007-10-11
Anticipated expiration: 2026-03-27
Also published as: JP4764221B2

Abstract

<P>PROBLEM TO BE SOLVED: To form an oil supplying channel within the wall thickness of a casing for introducing a lubricant oil to each object portion to be supplied with the lubricant oil without forming an opening in the outer periphery of the casing. <P>SOLUTION: The wall thickness of the rotor casing 11 incorporates a main oil supplying channel 23 penetrating through both end surfaces of a rotor casing 11, an oil supplying channel 24 for a compression acting space which defines an oil sump 27 communicating with the main oil supplying channel 23 in a joint between the rotor casing 11 and a discharge-side casing 12, and keeps one end opened in the oil sump 27 and the other end opened in a rotor chamber 113, and a discharge-side oil supplying channels 261 and 262 each keeping one end opened in the oil sump 27 and the other end communicating with a shaft seal portions 122a and 122b formed in the discharge-side casing 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は油冷式スクリュ圧縮機の給油流路に関し，より詳細には，油冷式スクリュ圧縮機の給油対象となる部分，例えば圧縮作用空間，増速装置等の歯車機構，軸封部，軸受等に対して潤滑油を供給するために，油冷式スクリュ圧縮機のケーシング内に設けた潤滑油の給油流路に関する。 The present invention relates to an oil cooling passage for an oil-cooled screw compressor, and more specifically, a portion to be oiled of an oil-cooled screw compressor, for example, a compression working space, a gear mechanism such as a speed increasing device, a shaft seal portion, The present invention relates to a lubricating oil supply passage provided in a casing of an oil-cooled screw compressor for supplying lubricating oil to a bearing or the like.

油冷式スクリュ圧縮機は，ケーシング内に形成されたロータ室内にオス，メス一対のスクリュロータを噛み合い回転可能に収容し，両スクリュロータの噛み合い回転によって両スクリュロータの歯間及びこのスクリュロータを収容するロータケーシングの内壁によって画成された圧縮作用空間を吸入側から吐出側に向かって徐々に体積減少させることで，この圧縮作用空間内に導入された吸入気体を圧縮し，吐出口より吐出することができるように構成されている。 An oil-cooled screw compressor accommodates a pair of male and female screw rotors in a rotor chamber formed in a casing so as to be rotatable. The screw rotors engage and rotate between the teeth of both screw rotors. By gradually reducing the volume of the compression working space defined by the inner wall of the rotor casing to be accommodated from the suction side to the discharge side, the suction gas introduced into the compression action space is compressed and discharged from the discharge port. It is configured to be able to.

このように構成された油冷式スクリュ圧縮機において，この油冷式スクリュ圧縮機のケーシングには，前記スクリュロータを収容するロータ室が形成されていると共に，該ロータ室内に収容されたスクリュロータのロータ軸を支承する軸受が収容された軸受室，ロータ軸と軸孔間の隙間を介して圧縮気体が漏出することを防止するためにロータ軸の外周と軸孔の内周間に配置された軸封手段を収容する軸封部，及び必要に応じてロータ軸に対して増速された回転駆動力を入力する増速ギヤ，両ロータの回転タイミングを規制するタイミングギヤ等の歯車機構を収容するギヤ室等が形成されている。 In the oil-cooled screw compressor configured as described above, the casing of the oil-cooled screw compressor is formed with a rotor chamber that houses the screw rotor, and the screw rotor that is housed in the rotor chamber. A bearing chamber containing a bearing for supporting the rotor shaft of the rotor is disposed between the outer periphery of the rotor shaft and the inner periphery of the shaft hole to prevent leakage of compressed gas through the gap between the rotor shaft and the shaft hole. A gear mechanism such as a shaft sealing portion for accommodating the shaft sealing means, a speed increasing gear for inputting a rotational driving force accelerated to the rotor shaft, if necessary, and a timing gear for regulating the rotation timing of both rotors. A gear chamber or the like for housing is formed.

このような油冷式スクリュ圧縮機にあっては，油冷式スクリュ圧縮機の潤滑，冷却及び圧縮作用空間の密封のために，前述のロータ室内に潤滑油を導入することが行われていると共に，前述の軸封室，軸受室，及び歯車機構に対しても潤滑油の導入を行っている。 In such an oil-cooled screw compressor, the lubricating oil is introduced into the rotor chamber for lubrication, cooling and sealing of the compression working space of the oil-cooled screw compressor. At the same time, lubricating oil is introduced into the above-described shaft seal chamber, bearing chamber, and gear mechanism.

そして，このような給油が必要とされる各部に対して潤滑油の導入を可能とするために，給油が必要となる各部に連通した給油流路をケーシングの肉厚内に形成すると共に，この給油流路をケーシングの外周において開口させて給油口とし，この給油口に対して例えばセパレータレシーバタンク等の給油源を連通することにより，各部に対する給油を行うことができるように構成している（特許文献１，特許文献２参照）。 In addition, in order to enable the introduction of lubricating oil to each part where such oil supply is required, an oil supply passage communicating with each part where oil supply is required is formed in the wall thickness of the casing. An oil supply passage is opened at the outer periphery of the casing to serve as an oil supply port, and an oil supply source such as a separator receiver tank is connected to the oil supply port so that each part can be supplied with oil ( (See Patent Document 1 and Patent Document 2).

この発明の先行技術文献情報としては次のものがある。
実公昭６３−３２９５０号公報実公平８−５４３号公報 Prior art document information of the present invention includes the following.
Japanese Utility Model Publication No. 63-32950 No. 8-543

ところで，油冷式スクリュ圧縮機の各給油対象部分に対して給油を行うための前述の給油流路は，例えば図１３に示すように，ケーシングの外周側から各給油対象部分に至る給油流路を，スクリュロータの軸線方向と直交方向に形成し，このようにして形成された前記ロータ軸と直交方向の各給油流路間を，前記ロータ軸に対して平行方向に形成された給油流路によって連通することにより形成している。 By the way, the above-described oil supply passage for supplying oil to each oil supply target portion of the oil-cooled screw compressor is, for example, as shown in FIG. 13, an oil supply flow path from the outer peripheral side of the casing to each oil supply target portion. Is formed in a direction orthogonal to the axial direction of the screw rotor, and an oil supply passage formed in a direction parallel to the rotor shaft is formed between the oil supply passages in the direction orthogonal to the rotor shaft thus formed. It is formed by communicating with.

そして，ロータ軸に対して直交方向に形成された各給油流路中，セパレータレシーバタンク等の給油源に連通されて給油口となるものを除き，ケーシング外周側における不要な開口をプラグ（栓）で封止し，給油源より供給された潤滑油が，前記各流路を介して各給油対象部分に導入されるように構成している。 In each oil supply passage formed in a direction orthogonal to the rotor shaft, unnecessary openings on the outer peripheral side of the casing are plugged (plugs) except for those connected to an oil supply source such as a separator receiver tank and the like. The lubricating oil supplied from an oil supply source is introduced into each oil supply target portion through each flow path.

上記従来の構造では，前述したように，ロータ軸に対して直交方向に形成された各流路のケーシング外周側における開口部分をプラグで塞ぐことにより前述した各流路を形成しているため，プラグによって塞ぐ箇所が多く、プラグを取り付けるための作業が煩雑である。 In the above-described conventional structure, as described above, each channel described above is formed by plugging the opening portion on the casing outer peripheral side of each channel formed in a direction orthogonal to the rotor axis. There are many places to be plugged by the plug, and the work for attaching the plug is complicated.

また，各流路の開口部に対するプラグの取り付けは，開口内周とプラグの外周とにそれぞれにネジを切り，両者を螺合することにより行っているが，この螺合部分を介して潤滑油が漏出する場合があり，潤滑油の漏出の有無につき常に気を配る必要があるだけでなく，漏出による潤滑油の減少に伴う潤滑油の補充等，油量管理が煩雑である。 In addition, the plugs are attached to the openings of the respective flow paths by cutting screws into the inner periphery of the opening and the outer periphery of the plug, and screwing them together. In addition to the need to always pay attention to the presence or absence of leakage of the lubricating oil, it is also complicated to manage the amount of oil, such as replenishing the lubricating oil when the lubricating oil decreases due to leakage.

さらに，前述のようにして潤滑油がケーシング外に漏出すると，このようにして漏出した潤滑油がケーシング外周を汚すと共に，その周辺に配置された機器，油冷式スクリュ圧縮機が設置された床面，その他の周辺設備等を汚すものとなり，掃除等の作業が繁雑である。 Furthermore, when the lubricating oil leaks out of the casing as described above, the lubricating oil leaked in this way contaminates the outer periphery of the casing, and the floor where equipment and oil-cooled screw compressors are installed around the casing. The surface and other peripheral equipment become dirty, and cleaning work is complicated.

そこで本発明は，上記従来技術における欠点を解消するためになされたものであり，比較的簡単な構成によって，ケーシングの外周側に開口を形成することなく形成することができ，従って，プラグを取り付ける手間が省けると共に，このような開口を設けない構成とすることにより，潤滑油の漏出を防止することで，潤滑油の減少と周囲の汚染を防止することができる油冷式スクリュ圧縮機の給油流路を提供することを目的とする。 Accordingly, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and can be formed without forming an opening on the outer peripheral side of the casing with a relatively simple configuration, and therefore, a plug is attached. Lubricating an oil-cooled screw compressor that saves labor and prevents the lubricant from leaking by preventing the lubricant from leaking out by adopting a configuration that does not provide such an opening. An object is to provide a flow path.

上記目的を達成するために，本発明の油冷式スクリュ圧縮機の給油流路は，噛み合い状態で回転して被圧縮気体を圧縮するオス，メス一対のスクリュロータ２，３をケーシング内に収容した油冷式スクリュ圧縮機１において，
前記一対のスクリュロータ２，３を収容するロータ室１１３が形成されたロータケーシング１１と，前記ロータケーシング１１の吐出側端面１１２に接合される接合面１２１を備え，前記オス，メスの各スクリュロータ２，３のロータ軸２ａ，３ａを収容する軸孔内に，軸受を備えた軸受室１２３ａ，１２３ｂと，前記軸受室１２３ａ，１２３ｂとロータ室１１３間に形成された軸封部１２２ａ，１２２ｂがそれぞれ形成された吐出側ケーシング１２と，前記ロータケーシング１１の吸入側端部に接合又はこれと一体に形成される吸入側ケーシング１３により前記ケーシングを形成し，
前記ロータケーシング１１の肉厚内に，前記ロータケーシング１１の吐出側端面１１２に一端２３ａ開口し，前記ケーシング１１の外周面におけるいずれかの位置（図示の実施形態では吸入側ケーシング１３の外周）において開口する給油口２１を備えた導入流路２２に連通する主給油流路２３を設けると共に，
一端を前記吐出側ケーシング１２の接合面１２１で開口し，他端を前記軸封部１２２ａ，１２２ｂで開口する吐出側給油流路２６，２６１，２６２と，
一端を前記ロータケーシング１１の前記吐出側端面１１２で開口し，他端を前記ロータ室１１３内に開口した圧縮作用空間用給油流路２４を設け，
吐出側における前記主給油流路２３の一端と，前記吐出側給油流路２６，２６１，２６２の一端，及び前記圧縮作用空間用流路２４の一端を，前記ロータケーシング１１と，前記吐出側ケーシング１２との接合部において連通させたことを特徴とする（請求項１）。 In order to achieve the above object, the oil supply passage of the oil-cooled screw compressor according to the present invention accommodates a pair of male and female screw rotors 2 and 3 that rotate in a meshed state and compress compressed gas in a casing. In the oil-cooled screw compressor 1
The male and female screw rotors include a rotor casing 11 in which a rotor chamber 113 for accommodating the pair of screw rotors 2 and 3 is formed, and a joint surface 121 joined to a discharge side end surface 112 of the rotor casing 11. Bearing shafts 123a and 123b having bearings and shaft sealing portions 122a and 122b formed between the bearing chambers 123a and 123b and the rotor chamber 113 are provided in shaft holes that accommodate the two and three rotor shafts 2a and 3a. The casing is formed by a discharge-side casing 12 formed respectively and a suction-side casing 13 that is joined to or integrally formed with the suction-side end portion of the rotor casing 11,
One end 23a opens at the discharge side end surface 112 of the rotor casing 11 within the thickness of the rotor casing 11, and at any position on the outer peripheral surface of the casing 11 (in the illustrated embodiment, the outer periphery of the suction side casing 13). A main oil supply passage 23 communicating with an introduction passage 22 having an opening for supplying oil 21 is provided;
Discharge-side oil supply passages 26, 261, 262 having one end opened at the joint surface 121 of the discharge-side casing 12 and the other end opened by the shaft sealing portions 122a, 122b;
A compression working space oil supply passage 24 having one end opened at the discharge-side end surface 112 of the rotor casing 11 and the other end opened into the rotor chamber 113;
One end of the main oil supply passage 23 on the discharge side, one end of the discharge side oil supply passages 26, 261 and 262, and one end of the flow passage 24 for the compression working space are connected to the rotor casing 11 and the discharge side casing. 12 is communicated at the joint portion with the first aspect (claim 1).

前記構成の給油流路において，ロータケーシング１１と吐出側ケーシング１２との接合部における主給油流路２３と吐出側給油流路２６，２６１，２６２との連通は，吐出側における前記主給油流路２３の開口位置を含む前記ロータケーシング１１の吐出側端面１１２，及び／又は，前記開口位置と対向する位置を含む前記吐出側ケーシング１２の接合面１２１に窪みを形成し，前記ロータケーシング１１と前記吐出側ケーシング１２との接合により前記窪み内に前記主給油流路２３と連通する油溜まり２７を形成すると共に，前記吐出側給油流路２６，２６１，２６２の一端を，前記油溜まり２７内に開口することで行うように構成しても良い。 In the oil supply passage having the above-described configuration, the communication between the main oil supply passage 23 and the discharge-side oil supply passages 26, 261, and 262 at the joint portion between the rotor casing 11 and the discharge-side casing 12 is the main oil supply passage on the discharge side. 23. A recess is formed in the discharge side end surface 112 of the rotor casing 11 including the opening position of 23 and / or the joint surface 121 of the discharge side casing 12 including the position facing the opening position, and the rotor casing 11 and the An oil sump 27 communicating with the main oil supply passage 23 is formed in the recess by joining with the discharge side casing 12, and one end of the discharge side oil supply passages 26, 261, 262 is formed in the oil sump 27. You may comprise so that it may carry out by opening.

また，別の連通方法としては，前記吐出側ケーシング１２の接合面１２１の，前記主給油流路２３の開口部と対向する位置に，前記吐出側給油流路２６，２６１，２６２の一端を開口するものとしても良い（請求項３）。 As another communication method, one end of each of the discharge-side oil supply passages 26, 261, and 262 is opened at a position of the joint surface 121 of the discharge-side casing 12 facing the opening of the main oil supply passage 23. (Claim 3).

さらに，前述の主給油流路２３と前記圧縮作用空間用給油流路２４を連通するために，前記圧縮作用空間用給油流路２４の一端を，前記油溜まり２７内に開口するものとしても良く（請求項４），又は，
前記圧縮作用空間用給油流路２４の一端を前記主給油流路２３の開口と共通の位置に開口するものとしても良い（請求項５）。 Further, one end of the compression working space oil supply passage 24 may be opened in the oil reservoir 27 in order to communicate the main oil supply passage 23 and the compression working space oil supply passage 24. (Claim 4), or
One end of the compression working space oil supply passage 24 may be opened at a position common to the opening of the main oil supply passage 23 (Claim 5).

さらに，前記吐出側給油流路２６，２６１，２６２が，オスロータ２のロータ軸２ａを収容する軸封部１２２ａに連通する吐出側給油流路２６１と，メスロータ３のロータ軸３ａを収容する軸封部１２２ｂに連通する吐出側給油流路２６２をそれぞれ備えるものとして構成することができる（請求項６）。 Further, the discharge-side oil supply passages 26, 261, and 262 have a discharge-side oil supply passage 261 that communicates with a shaft seal portion 122 a that houses the rotor shaft 2 a of the male rotor 2, and a shaft seal that houses the rotor shaft 3 a of the female rotor 3 It can comprise as each having the discharge side oil supply flow path 262 connected to the part 122b (Claim 6).

又は，前記吐出側給油流路２６を，オスロータ２のロータ軸２ａを収容する軸封部１２２ａ，又はメスロータ３のロータ軸３ａを収容する軸封部１２２ｂのいずれか一方に連通すると共に，前記２つの軸封部１２２ａ，１２２ｂ間を連通する連通路２８を設けるものとしても良い（請求項７）。 Alternatively, the discharge-side oil supply passage 26 communicates with either the shaft seal portion 122a that accommodates the rotor shaft 2a of the male rotor 2 or the shaft seal portion 122b that accommodates the rotor shaft 3a of the female rotor 3, and the 2 It is good also as what provides the communicating path 28 which connects between the shaft sealing parts 122a and 122b (Claim 7).

この場合，前記連通路２８として，オスロータ２のロータ軸２ａを収容する軸封部１２２ａの内壁からメスロータ３のロータ軸３ａを収容する軸封部１２２ｂ側に向かって形成されたオス側連通路２８ａと，前記オス側連通路２８ａの軸芯と交叉する軸芯を有し，メスロータ３のロータ軸３ａを収容する軸封部１２２ｂの内壁からオスロータ２のロータ軸２ａを収容する軸封部１２２ａ側に向かって形成されたメス側連通路２８ｂにより形成することができる（請求項８）。 In this case, as the communication path 28, the male side communication path 28 a formed from the inner wall of the shaft sealing part 122 a that accommodates the rotor shaft 2 a of the male rotor 2 toward the shaft sealing part 122 b that accommodates the rotor shaft 3 a of the female rotor 3. And a shaft sealing portion 122a side that accommodates the rotor shaft 2a of the male rotor 2 from the inner wall of the shaft sealing portion 122b that accommodates the rotor shaft 3a of the female rotor 3. It can be formed by the female side communication path 28b formed toward the head (claim 8).

以上説明した本発明の構成より，本発明の油冷式スクリュ圧縮機１の給油流路によれば，圧縮作用空間用給油流路２４及び吐出側給油流路２６（２６１，２６２）の形成に際し，ケーシングの外周側に開口を形成することなく，従って，従来技術として説明した給油機構のようにプラグによって開口を塞ぐことなく，ケーシング内に各流路を形成することができ，また，プラグを取り付ける手間が省けると共に，このような開口を設けない構成とすることにより，潤滑油の漏出を防止することで，潤滑油の減少と周囲の汚染を防止することができた。 According to the configuration of the present invention described above, according to the oil supply passage of the oil-cooled screw compressor 1 of the present invention, the oil supply passage 24 for the compression working space and the discharge-side oil supply passage 26 (261, 262) are formed. Therefore, it is possible to form each flow path in the casing without forming the opening on the outer peripheral side of the casing, and therefore, without closing the opening with the plug as in the oil supply mechanism described as the prior art. In addition to saving the time and effort of mounting, it was possible to prevent a decrease in the lubricating oil and contamination of the surroundings by preventing the leakage of the lubricating oil by adopting a configuration without such an opening.

また，主給油流路２３と吐出側給油流路２６（２６１，２６２），及び／又は圧縮作用空間用給油流路２４を，ロータケーシング１１と吐出側ケーシング１２との接合部に形成された油溜まり２７を介して連通することにより，各給油流路間の連通を容易に行うことができた。この油溜まり２７を形成するロータケーシング１１と吐出側ケーシング１２との接合部は，従来より両ケーシングの接合部分として油漏れ等に対する信頼性の高い部分であり，このような油溜まり２７の形成による潤滑油の漏出はない。 The main oil supply passage 23, the discharge-side oil supply passage 26 (261, 262), and / or the compression-action-space oil supply passage 24 are formed in the joint portion between the rotor casing 11 and the discharge-side casing 12. By communicating through the reservoir 27, it was possible to easily communicate between the oil supply passages. The joint between the rotor casing 11 and the discharge-side casing 12 that forms the oil reservoir 27 is a highly reliable part against oil leakage or the like as a joint between the two casings. There is no leakage of lubricant.

更に，主給油流路２３と吐出側給油流路２６（２６１，２６２）及び／又は圧縮作用空間用給油流路２４とを直接，前記接合部において連通させた構成にあっては，前述した油溜まり２７を形成する必要がなく，ケーシングの加工が容易である。 Furthermore, in the configuration in which the main oil supply passage 23, the discharge-side oil supply passage 26 (261, 262) and / or the compression operation space oil supply passage 24 are directly communicated with each other at the joint, It is not necessary to form the reservoir 27, and the casing can be easily processed.

さらに，吐出側ケーシング１２内に形成された，オスロータ２のロータ軸を収容する軸封部１２２ａと，メスロータ３のロータ軸を収容する軸封部１２２ｂ間を連通する連通路２８を設けたことにより，吐出側給油流路２６を前記軸封部１２２ａ，１２２ｂのいずれか一方に連通するもののみを設けることで，双方の軸封部１２２ａ，１２２ｂのいずれに対しても潤滑油を供給することのできる給油機構を形成することができた。 Further, by providing a communication passage 28 formed in the discharge-side casing 12 to communicate between the shaft seal portion 122a that accommodates the rotor shaft of the male rotor 2 and the shaft seal portion 122b that accommodates the rotor shaft of the female rotor 3. By providing only the discharge side oil supply passage 26 that communicates with either one of the shaft seal portions 122a and 122b, lubricating oil can be supplied to both the shaft seal portions 122a and 122b. A possible oiling mechanism could be formed.

次に，本発明の実施形態を添付図面を参照しながら以下説明する。 Next, embodiments of the present invention will be described below with reference to the accompanying drawings.

１．実施形態１
〔ケーシングの全体構造〕
本発明の給油流路が形成される油冷式スクリュ圧縮機１は，図１〜５に示すように，ケーシングが，オス，メス一対のスクリュロータ２，３が収容されるロータ室１１３が形成されたロータケーシング１１と，このロータケーシング１１の吸入側端部に取り付けられあるいはこれと一体に形成される吸入側ケーシング１３と，前記ロータケーシング１１の吐出側端部に取り付けられる吐出側ケーシング１２で構成されている。 1. Embodiment 1
[Overall structure of casing]
As shown in FIGS. 1 to 5, the oil-cooled screw compressor 1 in which the oil supply passage of the present invention is formed includes a rotor chamber 113 in which a casing accommodates a pair of male and female screw rotors 2 and 3. A rotor casing 11, a suction-side casing 13 attached to or integrally formed with the suction-side end of the rotor casing 11, and a discharge-side casing 12 attached to the discharge-side end of the rotor casing 11. It is configured.

このうち，前述のロータケーシング１１は，吐出側端部においてロータ室１１３を開放すると共に，吸入側端部にはスクリュロータ２，３の吸入側ロータ軸２ｂ，３ｂを収容する軸孔が形成され，この軸孔内に形成された軸受室１１５ａ，１１５ｂ内に軸受を収容し，この軸受にオス，メス各スクリュロータ２，３の吸入側ロータ軸２ｂ，３ｂを支承可能に構成している。 Among these, the rotor casing 11 described above opens the rotor chamber 113 at the discharge side end portion, and shaft holes for receiving the suction side rotor shafts 2b and 3b of the screw rotors 2 and 3 are formed at the suction side end portion. The bearings are accommodated in bearing chambers 115a and 115b formed in the shaft holes, and the suction side rotor shafts 2b and 3b of the male and female screw rotors 2 and 3 can be supported by the bearings.

前述のロータケーシング１１の吸入側端部には，ロータケーシング１１側に向かって開口するギヤ室１３１が形成された吸入側ケーシング１３が接合され，この吸入側ケーシング１３内に形成されたギヤ室１３１内には，オス，メスいずれかのスクリュロータに対して，図示せざるモータやエンジン等の駆動源からの回転駆動力を増速して入力する増速装置３０が収容されている。 The suction-side end portion of the rotor casing 11 is joined to the suction-side casing 13 formed with a gear chamber 131 that opens toward the rotor casing 11, and the gear chamber 131 formed in the suction-side casing 13. Inside, a speed increasing device 30 for speeding up and inputting a rotational driving force from a driving source such as a motor or an engine (not shown) is accommodated in either the male or female screw rotor.

この増速装置３０は，一例としていずれか一方のスクリュロータ２又は３のロータ軸（本実施形態にあってはオスロータ２の吸入側ロータ軸２ｂ）に固着された従動歯車３１と，この従動歯車３１に対して回転駆動力を伝達する駆動歯車３２，及び前記駆動歯車３２に前記駆動源で発生した回転駆動力を入力する入力軸３３が設けられており，前記駆動歯車３２に対して従動歯車３１を小径とすることにより，入力軸３３を介して入力された回転駆動力が増速されてオスロータ２の吸入側ロータ軸２ｂに伝達され，スクリュロータを増速回転させることができるように構成されている。 The speed increasing device 30 includes, as an example, a driven gear 31 fixed to the rotor shaft of one of the screw rotors 2 or 3 (in this embodiment, the suction side rotor shaft 2b of the male rotor 2), and the driven gear 31 A drive gear 32 that transmits a rotational drive force to 31 and an input shaft 33 that inputs the rotational drive force generated by the drive source to the drive gear 32 are provided. By making the diameter 31 small, the rotational driving force input via the input shaft 33 is accelerated and transmitted to the suction-side rotor shaft 2b of the male rotor 2, so that the screw rotor can be rotated at an increased speed. Has been.

なお，スクリュ圧縮機において，上記増速装置３０及び上記ギヤ室１３１は，必須の構成ではなく，スクリュ圧縮機の外部に増速装置を設けたり、駆動源からの回転駆動力を増速することなくそのままの回転で入力する場合など、増速装置３０及びギヤ室１３１が存在しないときは，吸入側ケーシング１３は，ロータケーシングと一体に形成することができる（図１２参照）。 In the screw compressor, the speed increasing device 30 and the gear chamber 131 are not essential components, and a speed increasing device is provided outside the screw compressor or the rotational driving force from the drive source is increased. If the speed increasing device 30 and the gear chamber 131 are not present, such as when input is performed without rotation, the suction casing 13 can be formed integrally with the rotor casing (see FIG. 12).

また，ロータケーシング１１の吐出側端部は，オスロータ２及びメスロータ３の吐出側ロータ軸２ａ，３ａを収容する軸孔が形成された吐出側ケーシング１２で覆われており，スクリュロータ２，３の吐出側ロータ軸２ａ，３ａを，前記吐出側ケーシング１２の軸孔内に形成された軸受室１２３ａ，１２３ｂ内に収容された軸受によって支承すると共に，この軸受室１２３ａ，１２３ｂとロータ室１１３との間の前記軸孔内に形成された軸封部１２２ａ，１２２ｂに，軸孔とロータ軸２ａ，３ａ間の隙間を封止する軸封手段，本実施形態にあってはスペーサ１２４等の軸封手段を収容している。 Further, the discharge-side end portion of the rotor casing 11 is covered with a discharge-side casing 12 in which shaft holes for receiving the discharge-side rotor shafts 2a and 3a of the male rotor 2 and the female rotor 3 are formed. The discharge-side rotor shafts 2a and 3a are supported by bearings housed in bearing chambers 123a and 123b formed in the shaft holes of the discharge-side casing 12, and the bearing chambers 123a and 123b and the rotor chamber 113 are connected to each other. A shaft sealing means for sealing a gap between the shaft hole and the rotor shafts 2a and 3a, shaft sealing such as a spacer 124 in this embodiment, is formed in the shaft sealing portions 122a and 122b formed in the shaft hole therebetween. Contains means.

〔給油流路〕
１．概略
以上のように構成されたケーシングを備えた油冷式スクリュ圧縮機において，ケーシングの肉厚内には，前記ロータ室１１３，軸封部１２２ａ，１２２ｂ及びギヤ室１３１に対して潤滑油を供給するための給油流路が形成されている。 [Oil supply channel]
1. Outline In the oil-cooled screw compressor provided with the casing configured as described above, lubricating oil is supplied to the rotor chamber 113, the shaft seal portions 122a and 122b, and the gear chamber 131 within the thickness of the casing. An oil supply passage is formed for this purpose.

なお，以下に説明する実施形態にあっては，油冷式スクリュ圧縮機の給油対象となる部分を，前述のロータ室１１３，ギヤ室１３１，及び軸封部１２２ａ，１２２ｂとした場合を例として説明するが，例えば，増速装置３０等の歯車機構を備えていない油冷式スクリュ圧縮機１にあっては，このようなギヤ室１３１自体を設ける必要がなく，従ってギヤ室１３１に対する給油を行う流路の形成は不要である。 In the embodiment described below, as an example, the portions to be lubricated of the oil-cooled screw compressor are the above-described rotor chamber 113, gear chamber 131, and shaft seal portions 122a and 122b. As will be described, for example, in the oil-cooled screw compressor 1 that is not provided with a gear mechanism such as the speed increasing device 30, it is not necessary to provide such a gear chamber 131 itself, and therefore the oil supply to the gear chamber 131 is not performed. It is not necessary to form a flow path.

また，前述した各部分に加え，ロータ軸を支承する各軸受を給油対象とし，これらの軸受を収容する軸受室１１５ａ，１１５ｂ，１２３ａ，１２３ｂに対しても潤滑油を導入する流路を形成しても良く，また，吸入側のロータ軸２ｂ，３ｂと軸孔間にも，吐出側と同様に軸封手段を設け，この軸封手段に対して給油可能と成す流路を更に形成することもできる。 In addition to the parts described above, bearings for supporting the rotor shaft are to be lubricated, and a flow path for introducing lubricating oil is also formed in the bearing chambers 115a, 115b, 123a, 123b for housing these bearings. Also, a shaft sealing means may be provided between the suction-side rotor shafts 2b and 3b and the shaft hole in the same manner as on the discharge side, and a flow path that can supply oil to the shaft sealing means is further formed. You can also.

前述した従来の給油流路が給油対象となる部分とケーシングの外周間を貫通する，スクリュロータ２，３の軸線方向に対して直交方向に形成された流路と，このスクリュロータ２，３の軸線方向に対して直交方向の流路間を連通する，ロータ軸の軸線方向に対して平行な流路により形成し，前記スクリュロータの軸線方向に対して直交方向の流路に形成されたケーシング外周における開口中，給油口となるものを除いてプラグで栓をした構成であったのに対し，本発明の給油流路にあっては，少なくとも前述の流路中，吐出側ケーシング１２内に設けられた給油対象（本実施形態あっては，軸封手段であるスペーサ１２４）に対して給油を行う流路（吐出側給油流路２６），及び，ロータ室１１３に対して給油を行う流路（圧縮作用空間用給油流路２４）については，ケーシングの外周側に開口することなく形成し，従って，プラグ等によって栓をすることなく給油流路を形成することができる構成とした点において相違するものである。 The above-described conventional oil supply flow path penetrates between the portion to be refueled and the outer periphery of the casing, and is formed in a direction perpendicular to the axial direction of the screw rotors 2 and 3 and the screw rotors 2 and 3 A casing formed by a flow path parallel to the axial direction of the rotor shaft that communicates between flow paths orthogonal to the axial direction, and formed in a flow path orthogonal to the axial direction of the screw rotor In contrast to the configuration in which the plug is plugged with the exception of the opening at the outer periphery, the oil supply passage of the present invention is at least in the discharge side casing 12 in the above-described flow passage. A flow path for supplying oil to the provided oil supply target (in this embodiment, the spacer 124 which is the shaft seal means) (discharge side oil supply flow path 26) and a flow for supplying oil to the rotor chamber 113. Road (supply for compression working space The flow path 24), formed without opening to the outer peripheral side of the casing, therefore, are those that differ in the point where the structure can be formed an oil supply passage without the plug by the plug and the like.

このように，ケーシングの外周側において開口しない，前述の吐出側給油流路２６１，２６２及び圧縮作用空間用給油流路２４を形成するために，本実施形態の給油流路では，以下のようにして各流路の形成と，連通とを行っている。 Thus, in order to form the above-described discharge-side oil supply passages 261 and 262 and the compression working space oil-use passage 24 that do not open on the outer peripheral side of the casing, the oil supply passage of the present embodiment is as follows. Each channel is formed and communicated.

２．スクリュロータの軸線方向と平行を成す流路（主流路）
前述したロータケーシング１１の肉厚内には，ロータケーシングの吸入側端面１１１，及び吐出側端面１１２間を貫通して，スクリュロータ２，３の軸線方向と平行に形成された流路２３（本発明において，「主給油流路」という。）が形成されている。 2. Flow path (main flow path) parallel to the axial direction of the screw rotor
Within the thickness of the rotor casing 11 described above, a flow path 23 (this is formed through the suction side end surface 111 and the discharge side end surface 112 of the rotor casing and formed parallel to the axial direction of the screw rotors 2 and 3. In the invention, it is referred to as a “main oil supply passage”.

図１に示すように，オス・メス一対のスクリュロータ２，３を水平方向に平行に並べて配置した本実施形態の油冷式スクリュ圧縮機１にあっては，この主給油流路２３をロータケーシング１１の底面側における肉厚内に，スクリュロータ２，３のロータ軸と平行に形成した。 As shown in FIG. 1, in the oil-cooled screw compressor 1 of this embodiment in which a pair of male and female screw rotors 2 and 3 are arranged in parallel in the horizontal direction, the main oil supply passage 23 is connected to the rotor. In the wall thickness on the bottom surface side of the casing 11, it was formed parallel to the rotor shafts of the screw rotors 2 and 3.

本実施形態にあっては，この主給油流路２３を吸入側ケーシング１３の肉厚内に迄延長し（図１及び図２参照），この吸入側ケーシング１３内で主給油流路２３に対して直交する導入流路２２を形成し，この導入流路２２をケーシング外周側における開口部分を前述の給油口２１として，セパレータレシーバタンク等の給油源からの潤滑油を導入可能に構成している。 In the present embodiment, the main oil supply passage 23 is extended to the thickness of the suction side casing 13 (see FIGS. 1 and 2), and the main oil supply passage 23 is extended within the suction side casing 13. The inlet passage 22 that is orthogonal to each other is formed, and the inlet passage 22 is configured such that the opening portion on the outer peripheral side of the casing is the above-described oil supply port 21 so that lubricating oil from an oil supply source such as a separator receiver tank can be introduced. .

３．連通構造（油溜まり）
本発明の給油機構において，前述の主給油流路２３と吐出側給油流路２６とは，前述の吐出側ケーシング１２とロータケーシング１１との接合部分において連通されており，図１〜４に示す実施形態にあっては，これら二つの流路２３，２６の連通を前記接合部に形成された油溜まり２７を介して行っている。 3. Communication structure (oil sump)
In the oil supply mechanism of the present invention, the main oil supply passage 23 and the discharge-side oil supply passage 26 are communicated at the joint portion between the discharge-side casing 12 and the rotor casing 11, and are shown in FIGS. In the embodiment, the communication between the two flow paths 23 and 26 is performed through an oil reservoir 27 formed at the joint.

この，ロータケーシング１１と吐出側ケーシング１２の接合部に形成された前述の油溜まり２７は，前述の主給油流路２３の開口位置を含むロータケーシング１１の端面１１２を切削，鋳抜き等して陥没させ，吐出側ケーシング１２の接合面１２１を接合した際，吐出側ケーシング１２の接合面１２１によって覆われた前記陥没部分が前記油溜まり２７となる空間を形成するようにしても良く，また，これとは反対に，吐出側ケーシング１２の接合面１２１に陥没部を形成し，この陥没部を，ロータケーシング１１の吐出側端面１１２であって前記主給油流路２３が開口する部分で覆うことにより，前記油溜まり２７となる空間を形成しても良く，さらには，ロータケーシング１１の吐出側端面１１２と吐出側ケーシング１２の接合面１２１の双方共に陥没部を形成し，両陥没部が重ね合わさって油溜まりとなる空間が形成されるように構成しても良い。 The oil sump 27 formed at the joint between the rotor casing 11 and the discharge-side casing 12 is obtained by cutting, casting or the like at the end surface 112 of the rotor casing 11 including the opening position of the main oil supply passage 23. When the joining surface 121 of the discharge-side casing 12 is joined by depression, the recessed portion covered by the joining surface 121 of the discharge-side casing 12 may form a space that becomes the oil reservoir 27. On the contrary, a depressed portion is formed on the joint surface 121 of the discharge casing 12, and the depressed portion is covered with a portion of the discharge casing end surface 112 of the rotor casing 11 where the main oil supply passage 23 opens. Thus, a space serving as the oil reservoir 27 may be formed. Further, the discharge-side end surface 112 of the rotor casing 11 and the joint surface 121 of the discharge-side casing 12 may be formed. Forming a depression in both, may be configured to space two recess becomes an oil reservoir by superposing is formed.

図示の実施形態は，前述のうち吐出側ケーシングの接合面１２１に前記陥没部を形成した例である（図２及び図３参照）。 The illustrated embodiment is an example in which the depressed portion is formed on the joining surface 121 of the discharge casing (see FIGS. 2 and 3).

４．吐出側給油流路
軸封装置（図示の例ではスペーサ１２４）等のロータケーシング１１内に収容された部材に対する給油を行う前述の吐出側給油流路２６１，２６２は，吐出側ケーシング１２の接合面１２１側から，吐出側ケーシング１２内に形成された給油対象部分，本実施形態にあっては軸封部１２２ａ，１２２ｂに向かって斜め方向に形成された流路であり，この吐出側給油流路２６１，２６２の一端２６１ａ，２６２ａ（接合面１２１側の端部；図３参照）が，前述の吐出側ケーシング１２とロータケーシング１１との接合部において，前記主給油流路２３と連通するように構成されている。 4). The discharge-side oil supply channels 261 and 262 for supplying oil to members housed in the rotor casing 11 such as the shaft seal device (the spacer 124 in the illustrated example) are the joint surfaces of the discharge-side casing 12. 121 is an oil supply target portion formed in the discharge-side casing 12 from the 121 side, in this embodiment, a flow passage formed in an oblique direction toward the shaft seal portions 122a and 122b. One end 261a, 262a (end portion on the joining surface 121 side; see FIG. 3) of 261, 262 communicates with the main oil supply passage 23 at the joining portion between the discharge-side casing 12 and the rotor casing 11 described above. It is configured.

本実施形態にあっては，前述の主給油流路２３と連通した前記油溜まり２７内に前述の吐出側ケーシング１２の接合面１２１における前記吐出側給油流路２６１，２６２の一端２６１ａ，２６２ａが配置されるように前記吐出側給油流路２６１，２６２を形成し，この油溜まり２７を介して吐出側給油流路２６１，２６２に潤滑油を導入可能とした。 In the present embodiment, one ends 261 a and 262 a of the discharge-side oil supply passages 261 and 262 in the joint surface 121 of the discharge-side casing 12 are provided in the oil reservoir 27 communicating with the main oil supply passage 23. The discharge-side oil supply passages 261 and 262 are formed so as to be disposed, and the lubricating oil can be introduced into the discharge-side oil supply passages 261 and 262 through the oil reservoir 27.

前述のように，オス・メス一対のスクリュロータ２，３を横置きに平行に配置した本実施形態にあっては，前記主給油流路２３と連通する前述の油溜まり２７を，スクリュロータ２，３の軸線方向と直交方向に長さ方向を有する形状に形成すると共に（図３参照），オスロータ２のロータ軸２ａの下部，及びメスロータ３のロータ軸３ａの下部に至る大きさに形成し，この油溜まり２７の長さ方向両端寄りにおいて油溜まり２７内でそれぞれ一端２６１ａ，２６２ａを開口する吐出側給油流路２６１，２６２を形成して，吐出側ケーシング１２内に形成された軸封部１２２ａ，１２２ｂのそれぞれに潤滑油を供給することができるよう構成した。 As described above, in the present embodiment in which the pair of male and female screw rotors 2 and 3 are arranged horizontally and in parallel, the oil reservoir 27 communicating with the main oil supply passage 23 is connected to the screw rotor 2. , 3 having a length direction perpendicular to the axial direction of the axis 3 (see FIG. 3), and having a size reaching the lower portion of the rotor shaft 2a of the male rotor 2 and the lower portion of the rotor shaft 3a of the female rotor 3. , Near the both ends of the oil reservoir 27 in the longitudinal direction, discharge-side oil supply passages 261 and 262 that open one end 261a and 262a in the oil reservoir 27 are formed, and a shaft seal portion formed in the discharge-side casing 12 is formed. The lubricating oil can be supplied to each of 122a and 122b.

吐出側ケーシング１２の接合面１２１に窪みを形成して前述の油溜まり２７とした本実施形態にあっては，この油溜まり２７となる窪みの内壁に前述の吐出側給油流路２６１，２６２の一端２６１ａ，２６２ａを開口しており，前述のようにこの油溜まり２７を圧縮機１の幅方向を長さ方向として形成した本実施形態にあっては，この油溜まり２７の両端近傍において，前記油溜まり２７となる窪みの上端壁よりオスロータ２のロータ軸２ｂの軸封部１２２ａ，及びメスロータ３のロータ軸３ｂの軸封部１２２ｂのそれぞれに向かって傾斜して設けられた吐出側給油流路２６１，２６２が設けられている（図２参照）。 In the present embodiment in which a recess is formed in the joint surface 121 of the discharge-side casing 12 to form the oil reservoir 27 described above, the discharge-side oil supply channels 261 and 262 described above are formed on the inner wall of the recess that becomes the oil reservoir 27. In the present embodiment in which the ends 261a and 262a are opened and the oil reservoir 27 is formed with the width direction of the compressor 1 as the length direction as described above, in the vicinity of both ends of the oil reservoir 27, Discharge-side oil supply passages that are inclined from the upper end wall of the recess that becomes the oil reservoir 27 toward the shaft seal portion 122 a of the rotor shaft 2 b of the male rotor 2 and the shaft seal portion 122 b of the rotor shaft 3 b of the female rotor 3. 261 and 262 are provided (see FIG. 2).

５．圧縮作用空間用給油流路
本発明において，前述の圧縮作用空間用給油流路２４は，ロータケーシング１１の吐出側端面１１２に一端２４ａを開口し，他端２４ｂを，前記ロータケーシング１１の内周面において開口する孔として形成されるもので，前述の主給油流路２３と連通して，主給油流路２３を介して導入された潤滑油をロータ室１２２内壁に形成された噴射口２４ｂより噴射して，圧縮作用空間内に潤滑油を導入する。 5). In the present invention, the compression working space oil supply passage 24 has one end 24 a opened to the discharge side end surface 112 of the rotor casing 11 and the other end 24 b to the inner circumference of the rotor casing 11. It is formed as a hole that opens in the surface, and communicates with the main oil supply passage 23 described above, and the lubricating oil introduced through the main oil supply passage 23 is injected from an injection port 24b formed in the inner wall of the rotor chamber 122. Inject and introduce lubricating oil into the compression space.

この圧縮作用空間用給油流路２４と，前記主給油流路２３との連通は，前記ロータケーシング１１の吐出側端面１１２における前記主給油流路２３の一端２３ａと，前記圧縮作用空間用給油流路２４の一端２４ａとを共通の位置に形成し，この一端２３ａ，２４ａを介して両流路が連通するように構成しても良く，または，前記吐出側給油流路２６の場合と同様に，前記油溜まり２７内において前記圧縮作用空間用給油流路２４の一端２４ａを開口させて，前述の主給油流路２３と圧縮作用空間用給油流路２４とがこの油溜まり２７を介して連通するように構成しても良い。 The compression working space oil supply passage 24 and the main oil supply passage 23 communicate with each other at one end 23a of the main oil supply passage 23 on the discharge side end surface 112 of the rotor casing 11 and the oil supply flow for the compression action space. The one end 24a of the passage 24 may be formed at a common position, and both the passages may be communicated with each other through the one ends 23a and 24a, or, similarly to the case of the discharge-side oil supply passage 26. , One end 24 a of the compression working space oil supply passage 24 is opened in the oil reservoir 27, and the main oil supply passage 23 and the compression working space oil supply passage 24 communicate with each other through the oil reservoir 27. You may comprise so that it may do.

本実施形態にあっては，図４に示すように前述の主給油流路２３の一端２３ａを，前述の油溜まり２７の長さ方向における略中心位置に開口し，圧縮作用空間用給油流路２４の一端２４ａをこの主給油流路２３の開口位置に対して同図紙面右方に設けている。 In the present embodiment, as shown in FIG. 4, one end 23 a of the main oil supply passage 23 is opened at a substantially central position in the length direction of the oil reservoir 27, and the oil supply passage for the compression working space is provided. One end 24 a of 24 is provided on the right side of the drawing with respect to the opening position of the main oil supply passage 23.

６．吸入側給油流路
なお，図２において，２５は，吸入側ケーシング１３内の給油対象（本実施形態にあっては増速装置３０）に対して潤滑油を供給する流路（吸入側給油流路）であり，吸入側ケーシング１３内に形成されたギヤ室１３１に潤滑油を導入することで，このギヤ室１３１内に収容された増速ギヤ３０を潤滑する。 6). In FIG. 2, reference numeral 25 denotes a flow path (suction side oil supply flow) for supplying lubricating oil to the oil supply target in the suction side casing 13 (the speed increasing device 30 in this embodiment). The speed increasing gear 30 accommodated in the gear chamber 131 is lubricated by introducing lubricating oil into the gear chamber 131 formed in the suction-side casing 13.

この吸入側給油流路２５は，本実施形態にあってはロータケーシング１１の吸入側端部近くにおいて，ロータ室１１３に隣接して設けられたギヤ室１３１の内壁から前記主給油流路２３に向かって斜めに形成された流路として構成され，主給油流路２３を介して導入された潤滑油をギヤ室１３１内に導入して，増速装置３０に対して供給可能に構成されている。 In the present embodiment, the suction-side oil supply passage 25 is connected to the main oil supply passage 23 from the inner wall of the gear chamber 131 provided adjacent to the rotor chamber 113 near the suction-side end of the rotor casing 11. It is configured as a flow path formed obliquely toward the front, and is configured to be able to supply the lubricating oil introduced through the main oil supply flow path 23 into the gear chamber 131 and supply it to the speed increasing device 30. .

もっとも，この吸入側給油流路２５の構成はこれに限定されず，従来技術として説明したと同様，吸入側ケーシング１３の外周から前記ギヤ室１３１に至る，スクリュロータ２，３の軸線方向に対して直交方向を成す流路として形成すると共に，この流路に，前記主給油流路２３の吸入側端部２３ｂを連通させても良い。 However, the configuration of the suction-side oil supply passage 25 is not limited to this, and the axial direction of the screw rotors 2 and 3 extending from the outer periphery of the suction-side casing 13 to the gear chamber 131 is the same as described in the prior art. In this case, the suction side end 23b of the main oil supply passage 23 may be communicated with the passage.

この場合には，ケーシングの外周で開口する前記吸入側流路２５の端部開口を，図示せざるセパレータレシーバタンク等の給油源に連通して，給油口２１として使用しても良い。 In this case, the end opening of the suction-side flow path 25 that opens at the outer periphery of the casing may communicate with an oil supply source such as a separator receiver tank (not shown) and used as the oil supply port 21.

〔作用等〕
前述の吐出側給油流路２６が形成された吐出側ケーシング１２の接合面１２１と，圧縮作用空間用給油流路２４が形成されたロータケーシング１１の吐出側端面１１２を，シール材を介して接合すると共に，ボルト等の締結具によって両者を締結すると，吐出側ケーシング１２の接合面１２１に形成された窪みがロータケーシング１１の吐出側端面１１２によって覆われ，これにより油溜まり２７が形成されると共に，この油溜まり２７を介してロータケーシング１１に形成された主給油流路２３と，吐出側ケーシング１２に形成された吐出側給油流路２６１，２６２，及びロータケーシング１１内に形成された圧縮作用空間用給油流路２４が連通し，主給油流路２３を介して吐出側給油流路２６１，２６２に導入された潤滑油が，吐出側ケーシング１２内に形成された軸封部１２２ａ，１２２ｂに供給されるように構成されている。 [Action etc.]
The joint surface 121 of the discharge-side casing 12 in which the discharge-side oil supply passage 26 is formed and the discharge-side end surface 112 of the rotor casing 11 in which the compression-action space oil supply passage 24 is formed are joined via a sealing material. At the same time, when both are fastened by a fastener such as a bolt, the recess formed in the joint surface 121 of the discharge casing 12 is covered by the discharge end surface 112 of the rotor casing 11, thereby forming an oil reservoir 27. The main oil supply passage 23 formed in the rotor casing 11 through the oil reservoir 27, the discharge-side oil supply passages 261 and 262 formed in the discharge-side casing 12, and the compression action formed in the rotor casing 11 The lubricating oil introduced into the discharge-side oil supply passages 261 and 262 via the main oil supply passage 23 is communicated with the space-use oil supply passage 24. Shaft seals 122a formed in single 12, is configured to be supplied to 122b.

また，吸入側ケーシング１３内に形成されたギヤ室１３１は，前述の吸入側給油流路２５を介して前記主給油流路２３に連通しており，この吸入側給油流路２５を介してギヤ室１３１内に潤滑油が導入されるように構成されている。 The gear chamber 131 formed in the suction side casing 13 communicates with the main oil supply passage 23 via the above-described intake side oil supply passage 25, and the gear via the suction side oil supply passage 25. Lubricating oil is configured to be introduced into the chamber 131.

このような給油流路を介して各部に導入された潤滑油中，ロータ室１１３（圧縮作用空間）内に導入された潤滑油は，圧縮作用空間内に吸入された気体と共に圧縮された後，油冷式スクリュ圧縮機の吐出口より吐出され，セパレータレシーバタンク内に導入されて，圧縮気体と分離された後，再度，給油口２１を介して本発明の給油流路に導入される。 The lubricating oil introduced into the rotor chamber 113 (compression working space) in the lubricating oil introduced into each part through such an oil supply flow path is compressed together with the gas sucked into the compressing working space. After being discharged from the discharge port of the oil-cooled screw compressor, introduced into the separator receiver tank and separated from the compressed gas, it is again introduced into the oil supply passage of the present invention through the oil supply port 21.

また，吐出側ケーシング１２内に形成された軸封部１２２ａ，１２２ｂ内に導入された潤滑油は，軸封部１２２ａ，１２２ｂ内において軸孔とスペーサ１２４，スペーサ１２４とロータ軸２ａ，３ａ間の隙間を密封して，これらの隙間から圧縮気体が漏出することを防止すると共に，スクリュロータ２，３の回転時による摩擦からスペーサ１２４を保護する。 Further, the lubricating oil introduced into the shaft sealing portions 122a and 122b formed in the discharge-side casing 12 is transferred between the shaft hole and the spacer 124 and between the spacer 124 and the rotor shafts 2a and 3a in the shaft sealing portions 122a and 122b. The gaps are sealed to prevent the compressed gas from leaking from these gaps, and the spacer 124 is protected from friction caused by the rotation of the screw rotors 2 and 3.

そして，このようにして軸封部１２２ａ，１２２ｂに導入された潤滑油の一部は，この軸封部１２２ａ，１２２ｂに軸孔を介して連通した軸受室１２３ａ，１２３ｂにも導入され，スクリュロータ２，３の吐出側ロータ軸２ｂ，３ｂを支承する軸受を潤滑する。 A part of the lubricating oil introduced into the shaft seal portions 122a and 122b in this way is also introduced into the bearing chambers 123a and 123b communicating with the shaft seal portions 122a and 122b through the shaft holes. The bearings for supporting the second and third discharge-side rotor shafts 2b and 3b are lubricated.

また，ギヤ室１３１内に導入された潤滑油は，このギヤ室１３１内に収容された増速装置３０を潤滑すると共に，スクリュロータ２，３の吸入側ロータ軸２ａ，３ａを支承する軸受等に対しても導入され，各部に対する潤滑油の導入が行われる。 The lubricating oil introduced into the gear chamber 131 lubricates the speed increasing device 30 accommodated in the gear chamber 131 and also supports bearings for the suction side rotor shafts 2a, 3a of the screw rotors 2, 3. In addition, lubricating oil is introduced into each part.

以上のように構成された油冷式スクリュ圧縮機１の給油流路において，前述した吐出側給油流路２６１，２６２の構成より，吐出側ケーシング１２の接合面１２１，又は前記接合面１２１に形成された油溜まり２７となる窪みの内壁から，吐出側ケーシング１２の内周に向けてドリルやリーマ等により斜め方向に直線状の穿孔を設けることで，軸封部１２２ａ，１２２ｂとの連通側端部２６１ｂ，２６２ｂにおいて，流路径を狭めた絞りを形成することも容易であり，また，ケーシングの外周に開口を形成することなく，主給油流路２３と連通する吐出側給油流路２６（２６１，２６２）を容易に形成することが可能である。 In the oil supply passage of the oil-cooled screw compressor 1 configured as described above, it is formed on the joint surface 121 of the discharge-side casing 12 or the joint surface 121 due to the configuration of the discharge-side oil supply passages 261 and 262 described above. From the inner wall of the hollow that becomes the oil reservoir 27, a linear perforation is provided obliquely by a drill, reamer, or the like toward the inner periphery of the discharge-side casing 12, so that the end on the communication side with the shaft seal portions 122a, 122b In the portions 261b and 262b, it is easy to form a throttle with a narrowed channel diameter, and the discharge-side oil supply channel 26 (261) communicated with the main oil supply channel 23 without forming an opening on the outer periphery of the casing. , 262) can be easily formed.

また，同様に，ロータケーシング１１内に形成した圧縮作用空間用給油流路２４についても，ロータケーシング１１の吐出側端面１１２よりドリルやリーマ等によって斜め方向に直線状に流路を穿孔することにより容易に形成することができると共に，ロータケーシング１１内のロータ室１１３側において開口を狭めて絞られた噴射口２４ｂを形成することが可能であると共に，ケーシングの外周に開口を形成することなく，主給油流路２３と連通する圧縮作用空間用給油流路２４を容易に形成することが可能である。 Similarly, the oil supply passage 24 for the compression working space formed in the rotor casing 11 is also formed by perforating the passage in a straight line in an oblique direction from the discharge side end face 112 of the rotor casing 11 with a drill or a reamer. It is possible to form the injection port 24b that is narrowed and narrowed on the rotor chamber 113 side in the rotor casing 11 and can be easily formed, and without forming an opening on the outer periphery of the casing, It is possible to easily form the oil supply passage 24 for the compression working space that communicates with the main oil supply passage 23.

従って，従来技術として説明した既知の給油機構のように，吐出側給油流路２６，圧縮作用空間用給油流路２４を形成するためにケーシングの外周に開口を形成する必要がなくなり，これにより，これらの開口を塞ぐためのプラグの取り付けが不要であると共に，このプラグの周囲から潤滑油が漏出することもない。 Accordingly, it is not necessary to form an opening in the outer periphery of the casing in order to form the discharge side oil supply passage 26 and the compression working space oil supply passage 24 as in the known oil supply mechanism described as the prior art. It is not necessary to attach a plug for closing these openings, and lubricating oil does not leak from the periphery of the plug.

２．実施形態２
次に，本発明の別の実施形態について図５〜８を参照して説明する。 2. Embodiment 2
Next, another embodiment of the present invention will be described with reference to FIGS.

図１〜４を参照して説明した，前述の実施形態１に記載の給油流路にあっては，吐出側ケーシング１２とロータケーシング１１との接合部に油溜まり２７となる空間を形成し，この油溜まり２７を介して主給油流路２３と吐出側給油流路２６１，２６２，及び圧縮作用空間用給油流路２４を連通する構成としていたが，図５〜８に示す実施形態にあっては，このような油溜まり２７となる空間を設けることなく，主給油流路２３と吐出側給油流路２６１，２６２，及び圧縮作用空間用給油流路２４とを直接連通する構成とした点において，前述の実施形態１の給油流路とは異なる。その他の点については，図１〜４を参照して説明した，前述の実施形態１の給油機構の構成と同様である。 In the oil supply passage according to the first embodiment described with reference to FIGS. 1 to 4, a space serving as an oil reservoir 27 is formed at the joint between the discharge-side casing 12 and the rotor casing 11. The main oil supply passage 23, the discharge-side oil supply passages 261 and 262, and the compression working space oil supply passage 24 are configured to communicate with each other through the oil reservoir 27. However, in the embodiment shown in FIGS. Is configured such that the main oil supply passage 23, the discharge-side oil supply passages 261 and 262, and the compression working space oil supply passage 24 are directly communicated with each other without providing such a space for the oil reservoir 27. , Different from the oil supply passage of the first embodiment. About another point, it is the same as that of the structure of the oil supply mechanism of above-mentioned Embodiment 1 demonstrated with reference to FIGS.

このような連通を可能とするために，本実施形態にあっては前述の吐出側給油流路２６１，２６２の一端２６１ａ，２６２ａを，吐出側ケーシング１２の接合面１２１であって，ロータケーシング１１の吐出側端面１１２に形成された前記主給油流路２３の一端２３ａにおける開口位置と一致する位置に形成した。 In order to enable such communication, in the present embodiment, the one ends 261a and 262a of the discharge-side oil supply channels 261 and 262 described above are the joint surfaces 121 of the discharge-side casing 12, and the rotor casing 11 It was formed at a position that coincides with the opening position at one end 23 a of the main oil supply passage 23 formed on the discharge side end face 112.

この吐出側給油流路２６として，オス，メス一対のスクリュロータ２，３のロータ軸のそれぞれに設けられた軸封装置を収容する軸封部１２２ａ，１２２ｂに対して給油を行うことができるよう，吐出側ケーシング１２に二本の吐出側給油流路２６１，２６２を形成した本実施形態にあっては，吐出側ケーシング１２の接合面１２１の前述した位置に，一端２６１ａ，２６２ａにおける開口を共通とする二本の吐出側給油流路２６１，２６２をＶ字状に形成した。 As the discharge-side oil supply passage 26, oil can be supplied to the shaft seal portions 122a and 122b that accommodate shaft seal devices provided on the rotor shafts of the male and female screw rotors 2 and 3, respectively. In the present embodiment in which the two discharge-side oil supply passages 261 and 262 are formed in the discharge-side casing 12, the opening at one end 261a and 262a is shared at the above-described position of the joint surface 121 of the discharge-side casing 12. The two discharge-side oil supply channels 261 and 262 are formed in a V shape.

また，前述の圧縮作用空用給油流路２４の一端２４ａにおける開口を，前述の主給油流路２３の一端２３ａに設けられた開口と共通の位置に設けると共に，この位置から，ロータケーシング１１内に形成されたロータ室１１３に向かって斜め方向に前記圧縮作用空間用給油流路２４を形成することで，主給油流路２３と圧縮作用空間用給油流路２４とが連通するように構成されている。 In addition, the opening at the one end 24a of the compression working empty oil supply passage 24 is provided at the same position as the opening provided at the one end 23a of the main oil supply passage 23, and from this position, the inside of the rotor casing 11 is provided. By forming the compression working space oil supply passage 24 in an oblique direction toward the rotor chamber 113 formed in the main chamber 23, the main oil supply passage 23 and the compression working space oil supply passage 24 are configured to communicate with each other. ing.

以上のように構成された本実施形態の油冷式スクリュ圧縮機１の給油機構にあっては，吐出側ケーシング１２とロータケーシング１１との接合部に，油溜まり２７となる空間を形成する必要がなく，主給油流路２３に直接，吐出側給油流路２６（２６１，２６２）及び圧縮作用空間用給油流路２４を連通することができ，加工が容易である。 In the oil supply mechanism of the oil-cooled screw compressor 1 of the present embodiment configured as described above, it is necessary to form a space serving as the oil reservoir 27 at the joint between the discharge-side casing 12 and the rotor casing 11. The discharge side oil supply passage 26 (261, 262) and the compression operation space oil supply passage 24 can be directly communicated with the main oil supply passage 23, and the processing is easy.

３．実施形態３
前述の図５〜８を参照して説明した実施形態２にあっては，二本のスクリュロータ２，３のロータ軸２ａ，３ａをそれぞれ収容する軸封部１２２ａ，１２２ｂにそれぞれ潤滑油の供給を行うことができるよう，吐出側給油流路２６１，２６２をＶ字状に二本設けていたのに対し，本実施形態にあっては，オス・メス一対のスクリュロータ２，３のうちのいずれか一方（本実施形態にあってはオスのスクリュロータ２）のロータ軸を収容する軸封部１２２ａに対して潤滑油を供給する吐出側給油流路２６を設け，他方のスクリュロータ（本実施形態にあってはメスロータ３）のロータ軸を収容する軸封部１２２ｂに対する給油を，両軸封部１２２ａ，１２２ｂを連通する連通路２８を介して行うように構成したものである（図９参照）。その他の構成については，図５〜８を参照して説明した実施形態２の給油機構の構成と同様である。 3. Embodiment 3
In the second embodiment described with reference to FIGS. 5 to 8, the lubricating oil is supplied to the shaft seal portions 122a and 122b that respectively accommodate the rotor shafts 2a and 3a of the two screw rotors 2 and 3. In contrast to the two V-shaped discharge-side oil supply passages 261 and 262, in the present embodiment, one of the pair of male and female screw rotors 2 and 3 is provided. A discharge-side oil supply passage 26 for supplying lubricating oil to a shaft seal portion 122a that accommodates the rotor shaft of either one (male screw rotor 2 in this embodiment) is provided, and the other screw rotor (main In the embodiment, oil supply to the shaft seal portion 122b that accommodates the rotor shaft of the female rotor 3) is performed through the communication passage 28 that communicates the shaft seal portions 122a and 122b (FIG. 9). reference). About another structure, it is the same as that of the structure of the oil supply mechanism of Embodiment 2 demonstrated with reference to FIGS.

オスロータ２のロータ軸を収容する軸封部１２２ａと，メスロータ３のロータ軸を収容する軸封部１２２ｂとを連通する前述の連通路２８は，前記吐出側ケーシング１２内に形成されたオスロータ２のロータ軸２ａを収容する軸封部１２２ａの内壁より，メスロータ３のロータ軸３ａを収容する軸封部１２２ｂに向かって斜め方向に穿設されたキリ孔であるオス側連通路２８ａと，メスロータ３のロータ軸を収容する軸封部１２２ｂの内壁面より，オスロータ２のロータ軸を収容する軸封部１２２ａ側に向かって斜め方向に穿設されたキリ孔であるメス側連通路２８ｂによって構成されており，オス側連通路２８ａの軸線上に，メス側連通路２８ｂの軸線を配置することで両連通路２８ａ，２８ｂを交叉・連通させることにより形成されている。 The above-described communication path 28 that communicates the shaft seal portion 122a that accommodates the rotor shaft of the male rotor 2 and the shaft seal portion 122b that accommodates the rotor shaft of the female rotor 3 is provided in the male rotor 2 formed in the discharge-side casing 12. A male-side communication path 28a, which is a drilled hole formed in an oblique direction from the inner wall of the shaft sealing portion 122a that accommodates the rotor shaft 2a toward the shaft sealing portion 122b that accommodates the rotor shaft 3a of the female rotor 3, and the female rotor 3 It is constituted by a female side communication passage 28b that is a drill hole that is drilled obliquely from the inner wall surface of the shaft sealing portion 122b that accommodates the rotor shaft of the male rotor 2 toward the shaft sealing portion 122a that accommodates the rotor shaft of the male rotor 2. It is formed by crossing and communicating the two communication paths 28a, 28b by arranging the axis of the female communication path 28b on the axis of the male communication path 28a. .

このオス側連通路２８ａ及びメス側連通路２８ｂを例えばボール盤等によって形成する際，ドリルやリーマが穿孔部分以外に干渉することがないよう，その形成角が調整されている。 When the male side communication path 28a and the female side communication path 28b are formed by, for example, a drilling machine or the like, the formation angles thereof are adjusted so that the drill or reamer does not interfere with any part other than the drilled part.

以上のように，吐出側ケーシング内に形成されたオス側軸封部とメス側軸封部とを連通する連通孔を設けたことにより，オス側軸封部と連通する吐出側給油流路を設けるだけで，メス側軸封部と連通する吐出側給油流路を別途設けることなくいずれの軸封部に対しても潤滑油を供給することができた。 As described above, by providing a communication hole that communicates the male side shaft seal part and the female side shaft seal part formed in the discharge side casing, the discharge side oil supply passage that communicates with the male side shaft seal part is provided. Lubricating oil could be supplied to any shaft seal without providing a separate discharge-side oil supply passage communicating with the female shaft seal.

４．実施形態４
図１２に示す実施形態にあっては，他の実施形態に対して、油冷式スクリュ圧縮機１に増速装置３０を備えてなく、ケーシングにギヤ室１３１を形成していない。 4). Embodiment 4
In the embodiment shown in FIG. 12, the oil-cooled screw compressor 1 is not provided with the speed increasing device 30 and the gear chamber 131 is not formed in the casing as compared with the other embodiments.

そして、ロータケーシング１１の肉厚内に設けられた主給油流路２３は，ロータケーシングの吐出側端面１１２から吸入側に向かって穿孔され，穿孔長さをロータケーシング１１の軸方向の中央部までとし、この主給油流路２３をロータケーシング１１に開口した給油口２１を備える導入流路２２に連通したものである。 The main oil supply passage 23 provided in the wall thickness of the rotor casing 11 is pierced from the discharge side end face 112 of the rotor casing toward the suction side, and the piercing length is extended to the central portion of the rotor casing 11 in the axial direction. The main oil supply passage 23 is communicated with an introduction passage 22 having an oil supply port 21 opened in the rotor casing 11.

その他の吐出側給油流路２６や圧縮作用空間用給油流路２４などの構成は，上述実施形態と同様である。 Other configurations such as the discharge-side oil supply passage 26 and the compression-action-space oil supply passage 24 are the same as those in the above-described embodiment.

本発明の給油流路を備えた油冷式スクリュ圧縮機の断面平面図，Sectional plan view of an oil-cooled screw compressor provided with an oil supply passage of the present invention, 本発明の給油流路を備えた油冷式スクリュ圧縮機の断面正面図，A cross-sectional front view of an oil-cooled screw compressor provided with an oil supply passage of the present invention, 図１のIII-III線矢視図，III-III arrow view of FIG. 図１のIV-IV線矢視図，IV-IV arrow view of FIG. 本発明の他の給油流路を備えた油冷式スクリュ圧縮機の断面平面図，Sectional plan view of an oil-cooled screw compressor provided with another oil supply passage of the present invention, 図５のVI-VI線矢視図，VI-VI arrow view of FIG. 図５のVII-VII線要部断面図，FIG. 5 is a cross-sectional view of an essential part of the line VII-VII in FIG. 図５のVIII-VIII線矢視図，VIII-VIII arrow view of FIG. 本発明のさらに他の給油流路を備えた油冷式スクリュ圧縮機の断面平面図，Sectional plan view of an oil-cooled screw compressor provided with still another oil supply passage of the present invention, 図９のX-X線矢視図，X-X arrow view of FIG. 吐出側ロータの拡大平面断面図，Enlarged plan cross-sectional view of the discharge-side rotor, ギヤ室１３１のないロータケーシングから成る油冷式スクリュ圧縮機に適用した本発明のさらに他の実施形態における給油流路を示す断面平面図，及びA cross-sectional plan view showing an oil supply passage in still another embodiment of the present invention applied to an oil-cooled screw compressor comprising a rotor casing without a gear chamber 131, and 従来の給油流路の構成例を示すケーシングの概略断面図。The schematic sectional drawing of the casing which shows the structural example of the conventional oil supply flow path.

符号の説明Explanation of symbols

１油冷式スクリュ圧縮機
２オスロータ
２ａロータ軸（吐出側）
２ｂロータ軸（吸入側）
３メスロータ
３ａロータ軸（吐出側）
３ｂロータ軸（吸入側）
１１ロータケーシング
１１１吸入側端面（ロータケーシング１１の）
１１２吐出側端面（ロータケーシング１１の）
１１３ロータ室
１１５ａ軸受室
１１５ｂ軸受室
１２吐出側ケーシング
１２１接合面
１２２軸封部
１２２ａ軸封部（オスロータのロータ軸の）
１２２ｂ軸封部（メスロータのロータ軸の）
１２３ａ軸受室（オスロータのロータ軸の）
１２３ｂ軸受室（メスロータのロータ軸の）
１２４スペーサ
１３吸入側ケーシング
１３１ギヤ室
２１給油口
２２導入流路
２３主給油流路
２３ａ一端（主給油流路２３の）
２３ｂ吸入側端部（主給油流路２３の）
２４圧縮作用空間用給油流路
２４ａ一端（圧縮作用空間用給油流路２４の）
２４ｂ噴射口（圧縮作用空間用給油流路２４の）
２５吸入側給油流路
２６吐出側給油流路
２６１吐出側給油流路（軸封部１２２ａ用）
２６１ａ一端（吐出側給油流路２６１の）
２６１ｂ他端（吐出側給油流路２６１の）
２６２吐出側給油流路（軸封部１２２ｂ用）
２６２ａ一端（吐出側給油流路２６２の）
２６２ｂ他端（吐出側給油流路２６２の）
２７油溜まり
２８連通路
２８ａオス側連通路
２８ｂメス側連通路
３０増速装置
３１従動歯車
３２駆動歯車
３３入力軸 1 Oil-cooled screw compressor 2 Male rotor 2a Rotor shaft (discharge side)
2b Rotor shaft (suction side)
3 Female rotor 3a Rotor shaft (discharge side)
3b Rotor shaft (suction side)
11 Rotor casing 111 Suction side end face (of rotor casing 11)
112 Discharge side end face (of rotor casing 11)
113 Rotor chamber 115a Bearing chamber 115b Bearing chamber 12 Discharge side casing 121 Joint surface 122 Shaft seal portion 122a Shaft seal portion (of rotor shaft of male rotor)
122b Shaft seal (of rotor shaft of female rotor)
123a Bearing chamber (male rotor shaft)
123b Bearing chamber (of rotor shaft of female rotor)
124 Spacer 13 Suction side casing 131 Gear chamber 21 Oil supply port 22 Introduction flow path 23 Main oil supply flow path 23a One end (of main oil supply flow path 23)
23b Suction side end (of main oil supply passage 23)
24 Oil supply flow path for compression working space 24a One end (of oil supply flow path 24 for compression working space)
24b Injection port (of the oil supply passage 24 for the compression working space)
25 Suction side oil supply passage 26 Discharge side oil supply passage 261 Discharge side oil supply passage (for shaft seal portion 122a)
261a One end (of the discharge-side oil supply passage 261)
261b The other end (of the discharge side oil supply passage 261)
262 Discharge side oil supply passage (for shaft seal 122b)
262a One end (of the discharge side oil supply flow path 262)
262b The other end (of the discharge side oil supply passage 262)
27 Oil reservoir 28 Communication path 28a Male communication path 28b Female communication path 30 Speed increasing device 31 Drive gear 32 Drive gear 33 Input shaft

Claims

噛み合い状態で回転して被圧縮気体を圧縮するオス，メス一対のスクリュロータをケーシング内に収容した油冷式スクリュ圧縮機において，
前記一対のスクリュロータを収容するロータ室が形成されたロータケーシングと，前記ロータケーシングの吐出側端面に接合される接合面を備え，前記オス，メスの各スクリュロータのロータ軸を収容する軸孔内に，軸受を備えた軸受室と，前記軸受室とロータ室間に形成された軸封部がそれぞれ形成された吐出側ケーシングと，前記ロータケーシングの吸入側端部に接合又はこれと一体に形成される吸入側ケーシングにより前記ケーシングを形成し，
前記ロータケーシングの肉厚内に，前記ロータケーシングの吐出側端面に一端を開口し，前記ケーシングの外周面における任意位置において開口する給油口を備えた導入流路に連通する主給油流路を設けると共に，
一端を前記吐出側ケーシングの接合面で開口し，他端を前記軸封部で開口する吐出側給油流路と，
一端を前記ロータケーシングの前記吐出側端面で開口し，他端を前記ロータ室内に開口した圧縮作用空間用給油流路を設け，
吐出側における前記主給油流路の一端と，前記吐出側給油流路の一端，及び前記圧縮作用空間用流路の一端を，前記ロータケーシングと，前記吐出側ケーシングとの接合部において連通させたことを特徴とする油冷式スクリュ圧縮機の給油流路。 In an oil-cooled screw compressor in which a pair of male and female screw rotors that rotate in a meshing state and compress compressed gas are housed in a casing,
A shaft hole for receiving the rotor shaft of each of the male and female screw rotors, comprising a rotor casing in which a rotor chamber for housing the pair of screw rotors is formed, and a joint surface joined to the discharge side end face of the rotor casing A bearing chamber having a bearing, a discharge-side casing formed with a shaft seal formed between the bearing chamber and the rotor chamber, and a suction-side end portion of the rotor casing, which are joined to or integrated with the suction-side end portion. The casing is formed by the formed suction side casing;
In the wall thickness of the rotor casing, there is provided a main oil supply passage that opens at one end of the discharge side end face of the rotor casing and communicates with an introduction passage having an oil supply opening that opens at an arbitrary position on the outer peripheral surface of the casing. Along with
A discharge-side oil supply passage having one end opened at the joint surface of the discharge-side casing and the other end opened by the shaft seal;
One end is opened at the discharge side end face of the rotor casing, and the other end is provided in the rotor chamber, and a compression working space oil supply passage is provided.
One end of the main oil supply passage on the discharge side, one end of the discharge side oil supply passage, and one end of the flow passage for the compression working space are communicated at a joint portion between the rotor casing and the discharge side casing. An oil supply passage for an oil-cooled screw compressor.

吐出側における前記主給油流路の開口位置を含む前記ロータケーシングの吐出側端面，及び／又は，前記開口位置と対向する位置を含む前記吐出側ケーシングの接合面に窪みを形成し，前記ロータケーシングと前記吐出側ケーシングとの接合により前記窪み内に前記主給油流路と連通する油溜まりを形成すると共に，前記吐出側給油流路の一端を，前記油溜まり内に開口したことを特徴とする請求項１記載の油冷式スクリュ圧縮機の給油流路。 A recess is formed in the discharge side end surface of the rotor casing including the opening position of the main oil supply passage on the discharge side and / or the joint surface of the discharge side casing including the position facing the opening position, and the rotor casing And an oil reservoir that communicates with the main oil supply passage is formed in the recess by joining the discharge side casing to the discharge side casing, and one end of the discharge side oil supply passage is opened in the oil reservoir. The oil supply flow path of the oil-cooled screw compressor according to claim 1.

前記吐出側ケーシングの接合面の，前記主給油流路の開口部と対向する位置に前記吐出側給油流路の一端を開口したことを特徴とする請求項１記載の油冷式スクリュ圧縮機の給油流路。 2. The oil-cooled screw compressor according to claim 1, wherein one end of the discharge-side oil supply passage is opened at a position of the joint surface of the discharge-side casing facing the opening of the main oil supply passage. Oil supply flow path.

前記圧縮作用空間用給油流路の一端を，前記油溜まり内に開口したことを特徴とする請求項２記載の油冷式スクリュ圧縮機の給油流路。 The oil supply passage of the oil-cooled screw compressor according to claim 2, wherein one end of the oil supply passage for the compression working space is opened in the oil reservoir.

前記圧縮作用空間用給油流路の一端を前記主給油流路の開口と共通の位置に開口したことを特徴とする請求項２又は３記載の油冷式スクリュ圧縮機の給油流路。 4. The oil supply passage of the oil-cooled screw compressor according to claim 2, wherein one end of the oil supply passage for the compression working space is opened at a position common to the opening of the main oil supply passage.

前記吐出側給油流路が，オスロータのロータ軸を収容する軸封部に連通する吐出側給油流路と，メスロータのロータ軸を収容する軸封部に連通する吐出側給油流路をそれぞれ備えることを特徴とする請求項１〜５いずれか１項記載の油冷式スクリュ圧縮機の給油流路。 The discharge-side oil supply passage includes a discharge-side oil supply passage that communicates with a shaft seal portion that accommodates the rotor shaft of the male rotor, and a discharge-side oil supply passage that communicates with a shaft seal portion that accommodates the rotor shaft of the female rotor. The oil supply flow path of the oil-cooled screw compressor according to any one of claims 1 to 5.

前記吐出側給油流路を，オスロータのロータ軸を収容する軸封部，又はメスロータのロータ軸を収容する軸封部のいずれか一方に連通すると共に，前記２つの軸封部間を連通する連通路を設けたことを特徴とする請求項１〜６いずれか１項記載の油冷却式スクリュ圧縮機の給油流路。 The discharge-side oil supply passage communicates with either a shaft seal portion that accommodates the rotor shaft of the male rotor or a shaft seal portion that accommodates the rotor shaft of the female rotor, and communicates between the two shaft seal portions. The oil supply flow path of the oil-cooled screw compressor according to any one of claims 1 to 6, wherein a passage is provided.

前記連通路を，オスロータのロータ軸が収容された軸封部の内壁からメスロータのロータ軸が収容された軸封部側に向かって形成されたオス側連通路と，前記オス側連通路の軸芯と交叉する軸芯を有し，メスロータのロータ軸が収容された軸封部の内壁からオスロータのロータ軸が収容された軸封部側に向かって形成されたメス側連通路により形成したことを特徴とする請求項７記載の油冷式スクリュ圧縮機の給油流路。
The communication path includes a male side communication path formed from an inner wall of the shaft sealing portion in which the rotor shaft of the male rotor is accommodated toward the shaft sealing portion in which the rotor shaft of the female rotor is accommodated, and an axis of the male side communication passage. It has a shaft core intersecting with the core, and is formed by a female side communication passage formed from the inner wall of the shaft seal portion accommodating the rotor shaft of the female rotor toward the shaft seal portion side accommodating the rotor shaft of the male rotor. The oil supply flow path of the oil-cooled screw compressor according to claim 7.