JP2017190732A5

JP2017190732A5 -

Info

Publication number: JP2017190732A5
Application number: JP2016081000A
Authority: JP
Filing date: 2016-04-14
Publication date: 2019-04-25
Anticipated expiration: 2036-04-14

Description

本発明の第一の態様に係る密閉型二段圧縮機は、内部に油溜まりを有するハウジングと、前記ハウジング内に配置された回転軸と、前記ハウジング内に配置されて前記回転軸を回転させる径方向外側に設けられたステータ及び径方向内側に設けられたロータを有するモータと、前記ハウジング内で前記モータに対して前記回転軸の軸線の方向の一方側に配置され、前記回転軸に接続されてガスを圧縮する低段側圧縮部と、前記ハウジング内で前記モータに対して前記軸線の方向の他方側に配置され、前記回転軸を支持する軸受本体、及び該軸受本体を前記ハウジングに支持する軸受ケーシングを有する軸受装置と、前記軸受装置に対して、前記軸線の方向の他方側に配置され、前記低段側圧縮部から吐出されたガスをさらに圧縮する高段側圧縮部と、を備え、前記軸受ケーシングには、前記高段側圧縮部へガスを吸入するように設けられて前記軸線の方向の一方側に向かって開口する吸入開口が設けられた吸入流路と、前記吸入開口と前記モータとの間に配置されて、径方向外側での前記吸入開口へのガスの流れを制限するように、前記ハウジングの内面から径方向内側に向かって設けられた制限面と、が設けられ、前記制限面は、前記吸入開口に対応する位置に径方向内側の端部から径方向外側に向かって切り欠かれた複数の切欠部を有し、前記吸入開口の径方向内側の位置のみが前記モータに向かって開口している。

A sealed type two-stage compressor according to a first aspect of the present invention includes a housing having an oil reservoir inside, a rotation shaft disposed in the housing, and a rotation shaft disposed in the housing and rotating the rotation shaft. A motor having a stator provided radially outward and a rotor provided radially inward, and disposed on one side in the direction of the axis of the rotary shaft with respect to the motor in the housing and connected to the rotary shaft A low-pressure stage compression unit for compressing the gas, a bearing main body disposed on the other side of the housing in the direction of the axis with respect to the motor in the housing, and supporting the rotary shaft; A bearing device having a bearing casing for supporting, and a high-stage side pressure which is disposed on the other side in the direction of the axis with respect to the bearing device and further compresses gas discharged from the low-stage compression portion A suction passage provided in the bearing casing so as to suck gas into the high-stage compression portion and provided with a suction opening that opens toward one side in the direction of the axis; A restriction surface disposed radially inward from the inner surface of the housing, disposed between the suction opening and the motor to limit the flow of gas to the suction opening radially outward And the restriction surface has a plurality of notches cut out radially outward from the radially inner end at a position corresponding to the suction opening, and the radial direction of the suction opening Only the inner position is open towards the motor .

Claims

A housing having an oil reservoir inside;
A rotary shaft disposed in the housing;
A stator provided inside the housing and provided radially outward for rotating the rotation shaft, and a motor having a rotor provided radially inside;
A low-stage compression unit disposed in the housing on one side in the direction of the axis of the rotary shaft with respect to the motor and connected to the rotary shaft to compress gas;
A bearing device having a bearing main body disposed on the other side of the motor in the direction of the axis with respect to the motor and supporting the rotary shaft, and a bearing casing supporting the bearing main body on the housing;
A high stage compression unit disposed on the other side in the direction of the axis with respect to the bearing device and further compressing the gas discharged from the low stage compression unit;
Equipped with
The bearing casing
A suction passage provided so as to suck gas into the high-stage compression section and provided with a suction opening that opens toward one side in the direction of the axis;
A restriction surface disposed radially inward from the inner surface of the housing so as to be disposed between the suction opening and the motor to restrict gas flow to the suction opening radially outward; ,
Is provided ,
The restriction surface has a plurality of notches cut out radially outward from the radially inner end at a position corresponding to the suction opening, and only the radially inner position of the suction opening A sealed two-stage compressor opening towards the motor .

The closed type two-stage compressor according to claim 1, further comprising an inflow restriction plate fixed to the bearing casing and in a plate shape and having the restriction surface on one side of the axis.

The restriction plane is
An annular flat surface which is provided at a radially outer end which is an inner surface side of the housing and which is orthogonal to the axis and centered on the axis;
A frusto-conical inclined surface centered on the axis, inclined toward one side in the direction of the axis as going radially inward from the plane;
The closed type two-stage compressor according to claim 1 or 2, comprising:

The radially inner inner edge of the limiting surface is located radially inward of the stator,
The sealed type according to any one of claims 1 to 3, wherein the restriction surface closes a part of the suction opening so as to ensure a suction amount of gas required in the high-stage compression section. Two-stage compressor.

The sealed type two-stage compressor according to any one of claims 1 to 4, further comprising a seal member provided in a gap between the radially outer outer edge of the restriction surface and the inner surface of the housing.

In the bearing casing, the high-stage compression portion communicates with one side in the direction of the axial line with respect to the bearing casing in the housing at the position of the radial outer end, and from the high-stage compression portion The closed type two-stage compressor according to any one of claims 1 to 5, further comprising an oil draining portion through which the oil of the present invention can flow.