Sealed compressor and vapor compression refrigeration cycle apparatus including the sealed compressor

Patent metadata

Field	Value
Publication number	US-9541310-B2
Application number	US-201314391928-A
Country	US
Kind code	B2
Filing date	Jan 16, 2013
Priority date	Apr 19, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A sealed compressor includes a centrifugal impeller above a rotor to synchronously rotate. A refrigerant rises through a rotor air hole, flows in an upper space, and flows out from a discharge pipe. The centrifugal impeller includes an oil separation plate on the rotor, and plural vanes standing on the oil separation plate, and forms inter-vane flow passages between adjacent vanes, and a vane inner flow passage that guides refrigerant from the rotor air hole to inner entrances of the inter-vane flow passages. Outer exits of the inter-vane flow passages are disposed along an entire circumference, and refrigerant increased in pressure while passing through the inter-vane flow passages flows out from the outer exits to the upper space. The oil separation plate closes a short-circuit passage through which the refrigerant directly flows from the vane inner flow passages to the discharge pipe without passing through the inter-vane flow passages.

First claim

The invention claimed is:

1. A sealed compressor comprising:
a sealed container that stores lubricant oil at a bottom thereof;
a motor that is provided within the sealed container and has a stator and a rotor;
a drive shaft attached to the rotor;
a compression mechanism that is provided within the sealed container and configured to compress a refrigerant upon rotation of the drive shaft;
a centrifugal impeller that is provided above the rotor and configured to rotate in synchronization with the rotor;
a rotor air hole that penetrates the rotor in an up-down direction; and
a discharge pipe configured to cause the refrigerant, upon flowing into a lower space of the motor, rising through the rotor air hole, and flowing into an upper space of the motor, to flow out from the upper space to an external circuit of the sealed container,
wherein the centrifugal impeller includes
an oil separation plate and a lower surface partition plate that are provided on an upper side of an upper end of the rotor so as to be spaced apart from each other,
a plurality of vanes that stand downwards from a lower surface of the oil separation plate and are provided from an inner peripheral side toward an outer peripheral side, and
inter-vane flow passages each provided between two adjacent vanes of the plurality of vanes, and a vane inner flow passage that guides the refrigerant, upon flowing out from the rotor air hole, to inner peripheral entrances of the inter-vane flow passages,
wherein the inter-vane flow passages are arranged along an entire circumference to guide the refrigerant from the inner peripheral entrances thereof to outer peripheral exits thereof, and cause the refrigerant increased in pressure while passing through the inter-vane flow passages to flow out from the outer peripheral exits into the upper space, and
wherein the oil separation plate covers an upper surface of the inter-vane flow passages to close an upper end of the vane inner flow passage, and the lower surface partition plate covers a lower surface of the inter-vane flow passages to close a short-circuit passage through which the refrigerant that has risen through the rotor air hole directly flows out to the discharge pipe without passing through the inter-vane flow passages.

2. The sealed compressor of claim 1 , wherein the upper surface of the inter-vane flow passages is entirely covered with the oil separation plate, and the lower surface of the inter-vane flow passages is entirely covered with the lower surface partition plate.

3. The sealed compressor of claim 1 , wherein the lower surface partition plate is disposed parallel to the oil separation plate in a direction of the drive shaft at a fixed distance therefrom.

4. The sealed compressor of claim 3 , further comprising an upper balance weight including a support flat plate to be fixed to the rotor and a projection that projects upwards from a part of the support flat plate and functions as a weight, the upper balance weight being provided at the upper end of the rotor,
wherein the lower surface of the inter-vane flow passages is covered with at least one of the lower surface partition plate, the support flat plate of the upper balance weight, and an upper surface of the projection of the upper balance weight.

5. The sealed compressor of claim 4 ,
wherein the lower surface partition plate that closes the lower surface of the inter-vane flow passages from the inner peripheral entrances to the outer peripheral exits is provided at least on a lower portion of the vanes in an area opposed to the projection of the upper balance weight, and
wherein the vanes under which the lower surface partition plate is not disposed extend to a portion near an upper end of the support flat plate of the upper balance weight.

6. The sealed compressor of claim 3 , further comprising a flow guide that guides the refrigerant flowing out from the rotor air hole to the inter-vane flow passages, the flow guide being connected at an upper end portion to an inner peripheral end portion of the lower surface partition plate, and being in contact at a lower end portion with an upper end of a member having an upper end opening defining the rotor air hole on an outer peripheral side of the rotor air hole.

7. The sealed compressor of claim 3 ,
wherein the lower surface partition plate is disposed on an entire lower surface of the plurality of vanes, and
wherein the vanes are uniform in length in the up-down direction.

8. The sealed compressor of claim 7 , further comprising a hollow cylindrical flow guide that guides the refrigerant flowing out from the rotor air hole to the inter-vane flow passages, the hollow cylindrical flow guide being connected at an upper end portion to an inner peripheral end portion of the lower surface partition plate, and being in contact at a lower end portion with an upper end of a member having an upper end opening defining the rotor air hole on an outer peripheral side of the rotor air hole.

9. The sealed compressor of claim 1 , wherein the plurality of vanes are disposed in axial symmetry with respect to the drive shaft.

10. The sealed compressor of claim 1 , wherein a flow passage area of the rotor air hole provided in the rotor is more than an area of a flow passage formed between an outer periphery of the rotor and an inner periphery of the stator.

11. The sealed compressor of claim 1 , wherein the rotor air hole is disposed on an inner peripheral side of a short diameter circumference having as a center the drive shaft in a plan view, the short diameter circumference being formed by a circle that connects inner peripheral end portions of the vanes.

12. The sealed compressor of claim 1 , wherein the oil separation plate is a disk symmetrical with respect to the drive shaft.

13. The sealed compressor of claim 7 ,
wherein the lower surface partition plate is a disk symmetrical with respect to the drive shaft, and
wherein the lower surface partition plate includes a flow passage hole through which the refrigerant flowing out from the rotor air hole flows into the inter-vane flow passages, the flow passage hole being provided on an inner side of a short diameter circumference having as a center the drive shaft, and the short diameter circumference being formed by a circle that connects inner peripheral end portions of the vanes.

14. The sealed compressor of claim 1 , wherein the vanes has an entrance angle determined such that the vanes are in contact with a short diameter circumference having as a center the drive shaft at an angle which falls within a range of ±5 degrees in a plan view, the short diameter circumference being formed by a circle that connects inner peripheral end portions of the vanes.

15. The sealed compressor of claim 1 , wherein the vanes are linear vanes.

16. The sealed compressor of claim 1 , wherein the plurality of vanes are formed by bending and raising a single plate at right angles.

17. The sealed compressor of claim 1 , further comprising an upper balance weight including a support flat plate to be fixed to the rotor and a projection that projects upwards from a part of the support flat plate and functions as a weight, the upper balance weight being provided at an upper end of the rotor,
wherein a covering wall is provided on the stator to block a flow in a radial direction from the outer peripheral exits of the inter-vane flow passages by surrounding an entire area around the projection of the upper balance weight and the outer peripheral exits of the inter-vane flow passages in the centrifugal impeller or a part of the surr

Assignees

• Yokoyama Tetsuhide
• Moroe Shogo
• Shirafuji Yoshinori
• Nishiki Teruhiko
• Kato Taro
• Maeyama Hideaki
• Nagasawa Hiroki
• Shingu Keisuke
• Mitsubishi Electric Corp

Inventors

• Yokoyama Tetsuhide
• Moroe Shogo
• Shirafuji Yoshinori
• Nishiki Teruhiko
• Kato Taro
• Maeyama Hideaki
• Nagasawa Hiroki
• Shingu Keisuke

Classifications

• F04C18/356

  with vanes reciprocating with respect to the outer member · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04D29/662

  Balancing of rotors (compensating imbalance G01M1/36) · CPC title

• F04B39/04

  Measures to avoid lubricant contaminating the pumped fluid · CPC title