US20110081269A1

US20110081269A1 - Scroll compressor

Info

Publication number: US20110081269A1
Application number: US12/773,436
Authority: US
Inventors: Tse Liang Hsiao; Pei Yu Yu; Liang Qiao Huang
Original assignee: Industrial Technology Research Institute ITRI
Current assignee: Industrial Technology Research Institute ITRI
Priority date: 2009-10-02
Filing date: 2010-05-04
Publication date: 2011-04-07
Also published as: TWI399485B; TW201113432A

Abstract

A scroll compressor includes an orbiting scroll member, a non-orbiting scroll member, a spacing block, and an annular pressure piece. The non-orbiting scroll member is disposed on the orbiting scroll member. The spacing block has a first annular recess and at least one first through hole. The spacing block is disposed on the non-orbiting scroll member. The first through hole is located within the first annular recess and penetrates the spacing block. The annular pressure piece has a second annular recess and at least one second through hole. The second through hole is located within the second annular recess and penetrates the annular pressure piece. The annular pressure piece is accommodated within the first annular recess. One side disposed with the second annular recess of the annular pressure piece faces the spacing block. The annular pressure piece is located between the spacing block and the non-orbiting scroll member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 098133651 filed in Taiwan, R.O.C. on Oct. 2, 2009, the entire contents of which are hereby incorporated by reference.

BACKGROUND

1. Technical Field
The present invention relates to a compressor, and more particularly to a scroll compressor.
2. Related Art
A compressor is a main element in an air conditioner and a refrigerator used in daily life. In fact, the compressor is closely associated with muting effect, heat exchange effect, and service life of the above two electrical apparatuses.
In a conventional scroll compressor, an orbiting scroll member is usually driven by rotation of a motor rotor, such that the orbiting scroll member performs engaging movement of revolution about a non-orbiting scroll member without spinning. Through such movement, the conventional scroll compressor sucks a working fluid into a space between the orbiting scroll member and the non-orbiting scroll member, compresses the working fluid, and then discharges the high-pressure working fluid.
However, in order to efficiently perform the above movement, a desirable air tight effect must be ensured between the non-orbiting scroll member and the orbiting scroll member. If a poor air tight effect is provided between the non-orbiting scroll member and the orbiting scroll member, the orbiting scroll member may crash the non-orbiting scroll member due to instable pressing and holding effects, which may cause problems that the compressor produces noises, excessive abrasion is generated between the non-orbiting scroll member and the orbiting scroll member, and the service life of the compressor is shortened.

SUMMARY

In view of the above problems, the present invention is a scroll compressor, which is applicable to solve the problem that a desirable air tight effect cannot be provided between a non-orbiting scroll member and an orbiting scroll member in the prior art.
Based on the above and other objectives, the present invention provides a scroll compressor, which comprises a motor, a frame, an orbiting scroll member, a non-orbiting scroll member, a spacing block, an annular pressure piece, and a shell. The frame is located between the motor and the orbiting scroll member, and a transmission shaft of the motor penetrates the frame and is connected to the orbiting scroll member. The non-orbiting scroll member is disposed on the orbiting scroll member. The spacing block has a first annular recess and at least one first through hole. The spacing block is disposed on the non-orbiting scroll member. The first through hole is located within the first annular recess and penetrates the spacing block. The annular pressure piece has a second annular recess and at least one second through hole. The second through hole is located within the second annular recess and penetrates the annular pressure piece. The annular pressure piece is accommodated within the first annular recess. One side disposed with the second annular recess of the annular pressure piece faces the non-orbiting scroll member, and the annular pressure piece is located between the spacing block and the non-orbiting scroll member. The shell accommodates the motor, the frame, the orbiting scroll member, the spacing block, and the annular pressure piece.
According to an alternative embodiment, the spacing block is fixed within the shell. The annular pressure piece is disposed within the first annular recess in a manner of sliding relative to the spacing block. Preferably, the non-orbiting scroll member has a projecting portion. The above through hole penetrates the projecting portion. The projecting portion penetrates the spacing block in a manner of sliding relative to the spacing block. In addition, the spacing block separates the shell into a high pressure cavity and a low pressure cavity. When a refrigerant enters the low pressure cavity, the orbiting scroll member and the non-orbiting scroll member compress the refrigerant into a high-pressure gaseous refrigerant. Then, the high-pressure gaseous refrigerant enters the high pressure cavity via the through hole. Moreover, the high-pressure gaseous refrigerant is distributed within the second annular recess via the first through hole and the second through hole, for example, so as to push the non-orbiting scroll member towards the orbiting scroll member. More preferably, the scroll compressor further comprises an annular sealing piece. The projecting portion penetrates the annular sealing piece, and the annular sealing piece is located between the projecting portion and the spacing block.
According to an alternative embodiment of the present invention, the scroll compressor further comprises an annular sealing piece, which is disposed between an inner wall surface of the spacing block disposed with the first annular recess and the annular pressure piece.
According to an alternative embodiment of the present invention, the scroll compressor further comprises an annular sealing piece, which is disposed between an outer wall surface of the spacing block disposed with the first annular recess and the annular pressure piece.
According to an alternative embodiment of the present invention, an inner edge of the annular pressure piece has an annular flange.
According to an alternative embodiment of the present invention, an outer edge of the annular pressure piece has an annular flange.
According to an alternative embodiment of the present invention, the frame is fixed to the shell and the transmission shaft is a crank shaft.
According to an alternative embodiment of the present invention, the annular pressure piece has more than two second through holes and the through holes are circular or strip-shaped.
According to an alternative embodiment of the present invention, an outer edge of the second annular recess is a linear type and an inner edge of the second annular recess is an annular flange.
According to an alternative embodiment of the present invention, the second through holes are distributed on the annular pressure piece in a symmetric manner.
According to an alternative embodiment of the present invention, the spacing block further has a third through hole. Preferably, the projecting portion of the non-orbiting scroll member is inserted in the third through hole.
According to an alternative embodiment of the present invention, the second annular recess communicates with the first through hole and the second through hole.
In the scroll compressor, the annular pressure piece is located between the spacing block and the non-orbiting scroll member, the annular pressure piece is accommodated within the first annular recess, and one side disposed with the second annular recess of the annular pressure piece faces the spacing block. Thus, when the compressed high temperature and high pressure refrigerant is dissipated from one side of the non-orbiting scroll member facing the orbiting scroll member to the other side away from the orbiting scroll member, the high temperature and high pressure gas is enabled to press the non-orbiting scroll member towards the orbiting scroll member through the first through hole and the second through hole, so as to enhance the air tightness between the orbiting scroll member and the non-orbiting scroll member.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a schematic sectional view of a scroll compressor according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along a section line AA in FIG. 1;

FIG. 3 is a partially-enlarged schematic view of FIG. 1;

FIG. 4 is a schematic top view of an annular pressure piece in FIG. 1;

FIG. 5 is a schematic view taken along a section line BB in FIG. 4;

FIG. 6 is a schematic top view of an annular pressure piece according to another embodiment of the present invention;

FIG. 7 is a schematic top view of an annular pressure piece according to yet another embodiment of the present invention;

FIG. 8 is a schematic sectional view of an annular pressure piece according to still another embodiment of the present invention; and

FIG. 9 is a schematic sectional view of an annular pressure piece according to yet another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the detailed description below, detailed features and advantages of the present invention are illustrated, the contents are sufficient for any person skilled in the art to understand and implement the technical contents of the present invention. Any person skilled in the art can easily understand relevant objectives and advantages of the present invention according to the contents disclosed in the specification, the claims, and the accompanying drawings. The view points of the present invention are further illustrated in detail in the following embodiments, and none of the view points is intended to limit the scope of the present invention.
FIG. 1 is a schematic sectional view of a scroll compressor according to an embodiment of the present invention. Referring to FIG. 1, a scroll compressor 100 comprises a shell 110, a motor 120, a frame 130, an orbiting scroll member 140, a non-orbiting scroll member 150, a spacing block 160, and an annular pressure piece 170.
The shell 110 has an accommodation space. The spacing block 160 is located within the accommodation space and fixed to the shell 110. An outer edge of the spacing block 160 is connected to an inner wall surface of the shell 110 in an air tight manner, so as to separate the accommodation space into a high pressure cavity H and a low pressure cavity L.
The motor 120 is located within the low pressure cavity L and is located at a bottom of the shell 110. The motor 120 comprises a motor body 122 and a transmission shaft 124. In this embodiment, the transmission shaft 124 is a crank shaft. Thus, when one end of the transmission shaft 124 is connected to the motor body 122 and the transmission shaft 124 rotates upon being driven by the motor body 122, the transmission shaft 124 moves on a plane along a circular arc path.
The frame 130 is located within the low pressure cavity L and fixed on the inner wall surface of the shell 110. The transmission shaft 124 penetrates the frame 130 from one side of the frame 130 and projects to the other side of the frame 130.
The orbiting scroll member 140 is located within the low pressure cavity L and comprises a scroll member body 142 and a wall 144. The scroll member body 142 is located on the frame 130 and has two sides opposite to each other. The transmission shaft 124 penetrates the frame 130 and is connected to one side of the scroll member body 142. The wall 144 stands on the other side of the scroll member body 142 and extends on the scroll member body 142 along a vortex-shaped path.
Based on the structures of the motor 120, the frame 130, and the orbiting scroll member 140, the orbiting scroll member 140 is enabled to be driven by the motor 120 to move on the frame 130 along a circular arc path.
The non-orbiting scroll member 150 is located within the low pressure cavity L and is located between the spacing block 160 and the orbiting scroll member 140. The non-orbiting scroll member 150 comprises a scroll member body 152 and a wall 154. The scroll member body 152 is located on the orbiting scroll member 140. The scroll member body 152 has a first side 152 a and a second side 152 b opposite to each other. The scroll member body 152 is located on the wall 144 and contacts the wall 144. The wall 154 stands at one side of the scroll member body 152 facing the orbiting scroll member 140, that is, standing at the first side 152 a of the scroll member body 152. The wall 154 bears against the scroll member body 142, such that a plurality of compression cavities P is formed between the wall 144 and the wall 154.
The structure of the spacing block 160 is further described below. FIG. 2 is a schematic sectional view taken along a section line AA in FIG. 1. FIG. 3 is a partially-enlarged schematic view of FIG. 1. Referring to FIGS. 1 to 3, one side of the spacing block 160 facing the non-orbiting scroll member 150 has a first annular recess 162 and a first through hole 164. The first through hole 164 is located within the first annular recess 162 and penetrates the spacing block 160.
A connection relation between the spacing block 160 and the non-orbiting scroll member 150 is illustrated in the following through examples. In this embodiment, the other side of the scroll member body 152 opposite to the first side 152 a (that is, the second side 152 b) has a projecting portion 156. The spacing block 160 further has a third through hole 166. The projecting portion 156 is inserted into the spacing block 160 through the third through hole 166. The non-orbiting scroll member 150 further has a through hole 158. The through hole 158 penetrates the non-orbiting scroll member 150, such that one of the compression cavities P that is located at a center of the scroll member body 152 communicates with the high pressure cavity H. Preferably, the projecting portion 156 is inserted into the spacing block 160 in a manner of sliding relative to the spacing block 160. In addition, in order to increase the air tightness between the spacing block 160 and the projecting portion 156, for example, the scroll compressor 100 may further comprise an annular sealing piece 180. The projecting portion 156 penetrates the annular sealing piece 180 and the annular sealing piece 180 is located between the projecting portion 156 and the spacing block 160.
FIG. 4 is a schematic top view of the annular pressure piece 170 in FIG. 1. FIG. 5 is a schematic view taken along a section line BB in FIG. 4. Referring to FIGS. 1 to 4, the annular pressure piece 170 is located between the spacing block 160 and the non-orbiting scroll member 150 and the annular pressure piece 170 is accommodated within the first annular recess 162. Preferably, the annular pressure piece 170 is disposed within the first annular recess 162 in a manner of sliding relative to the spacing block 160. The annular pressure piece 170 has a second annular recess 172 and at least one second through hole 174. The second through hole 174 is located within the second annular recess 172 and penetrates the annular pressure piece 170. One side disposed with the second annular recess 172 of the annular pressure piece 170 faces the non-orbiting scroll member 150. Based on the above structure, the second annular recess 172 communicates with the high pressure cavity H through the second through hole 174 and the first through hole 164 in sequence.
Preferably, in order to enhance the air tightness between the spacing block 160 and the annular pressure piece 170, the scroll compressor 100 further has an annular sealing piece 190 and an annular sealing piece 195. The annular sealing piece 190 is disposed between an inner wall surface of the spacing block 160 disposed with the first annular recess 162 and the annular pressure piece 170. The annular sealing piece 195 is disposed between an outer wall surface of the spacing block 160 disposed with the first annular recess 162 and the annular pressure piece 170.
Based on the above structures, when a low-pressure gaseous refrigerant R enters the low pressure cavity L from exterior of the shell 110 and enters the compression cavities P from the low pressure cavity L, the low-pressure gaseous refrigerant R is squeezed by the wall 144 and wall 154, moves towards a central position of the non-orbiting scroll member 150, and is gradually compressed into a high-pressure gaseous refrigerant R from the low-pressure gaseous refrigerant R. Subsequently, the high-pressure gaseous refrigerant R is dissipated to the high pressure cavity H via the through hole 158. As the high pressure cavity H communicates with the second annular recess 172 through the first through hole 164 and the second through hole 174, a pressure of the gas located in the second annular recess 172 is higher than that of the gas located within the low pressure cavity L. Therefore, the high-pressure gaseous refrigerant R filled in the second annular recess 172 pushes the non-orbiting scroll member 150 towards the orbiting scroll member 140. Based on such a structure, in this embodiment, the air tightness between the non-orbiting scroll member 150 and the orbiting scroll member 140 is enhanced by using the pushing effect of the high-pressure gaseous refrigerant R, thereby preventing the pressurized refrigerant R from dissipating out of the compression cavities P.
Although the annular pressure piece 170 only has a single second through hole 174 in this embodiment, it is not intended to limit the number of the second through holes in the present invention. FIG. 6 is a schematic top view of an annular pressure piece 170′ according to another embodiment of the present invention. Different from the annular pressure piece 170 shown in FIGS. 2, 4, and 5, the annular pressure piece 170′ in this embodiment may have a plurality of second through holes 174 distributed on the annular pressure piece 170′ in a symmetric manner. In other words, persons skilled in the art may use an annular pressure piece having a single second through hole or a plurality of second through holes depending on design demands.
Moreover, the second through holes 174 of the annular pressure piece 170 and the annular pressure piece 170′ are circular, but the shape of the second through holes is not limited in the present invention. FIG. 7 is a schematic top view of an annular pressure piece 170″ according to yet another embodiment of the present invention. Different from the annular pressure piece 170 and the annular pressure piece 170′, the annular pressure piece 170″ has strip-shaped second through holes 174′. In other words, persons skilled in the art can change the shape of the second through hole of the annular pressure piece depending on design demands.
Similarly, the above embodiment is not intended to limit the shape of the annular pressure piece in the present invention. FIG. 8 is a schematic sectional view of an annular pressure piece 170″′ according to still another embodiment of the present invention. In this embodiment, an inner edge of the annular pressure piece 170″′ has an annular flange 176. In addition, FIG. 9 is a schematic sectional view of an annular pressure piece 170″″ according to yet another embodiment of the present invention. Different from the annular pressure piece 170″' shown in FIG. 8, besides having the annular flange 176 formed on an inner edge, the annular pressure piece 170″″ further has an annular flange 178 on an outer edge. Through the design of the annular flanges 176/178, in the present invention, a contact area between the annular pressure piece 170″′/170″″ and the non-orbiting scroll member 150 is increased, thereby enhancing the air tightness between the annular pressure piece 170″′/170″″ and the non-orbiting scroll member 150.
To sum up, in the scroll compressor, the annular pressure piece is located between the spacing block and the non-orbiting scroll member, the annular pressure piece is accommodated within the first annular recess, and one side disposed with the second annular recess of the annular pressure piece faces the spacing block. Thus, when the compressed high temperature and high pressure refrigerant is dissipated from one side of the non-orbiting scroll member facing the orbiting scroll member to the other side away from the orbiting scroll member, the high temperature and high pressure gas is enabled to press the non-orbiting scroll member towards the orbiting scroll member through the first through hole and the second through hole, so as to enhance the air tightness between the orbiting scroll member and the non-orbiting scroll member.

Claims

1. A scroll compressor, comprising:

a motor, having a transmission shaft;

a frame, disposed on the motor;

an orbiting scroll member, disposed on the frame, wherein the transmission shaft penetrates the frame and is connected to the orbiting scroll member;

a non-orbiting scroll member, disposed on the orbiting scroll member;

a spacing block, having a first annular recess and at least one first through hole, wherein the first through hole is located within the first annular recess and penetrates the spacing block, and the spacing block is disposed on the non-orbiting scroll member;

an annular pressure piece, having a second annular recess and at least one second through hole, wherein the second through hole is located within the second annular recess and penetrates the annular pressure piece, the annular pressure piece is accommodated within the first annular recess, one side disposed with the second annular recess of the annular pressure piece faces the non-orbiting scroll member, and the annular pressure piece is located between the spacing block and the non-orbiting scroll member; and

a shell, for accommodating the motor, the frame, the orbiting scroll member, the spacing block, and the annular pressure piece.

2. The scroll compressor according to claim 1, wherein the spacing block is fixed within the shell and the annular pressure piece is disposed within the first annular recess in a manner of sliding relative to the spacing block.

3. The scroll compressor according to claim 2, wherein the non-orbiting scroll member has a projecting portion, the through hole penetrates the projecting portion, and the projecting portion penetrates the spacing block in a manner of sliding relative to the spacing block.

4. The scroll compressor according to claim 3, wherein the spacing block separates the shell into a high pressure cavity and a low pressure cavity, the orbiting scroll member and the non-orbiting scroll member compress a refrigerant into a high-pressure gaseous refrigerant when the refrigerant enters the low pressure cavity, and the high-pressure gaseous refrigerant enters the high pressure cavity via the through hole.

5. The scroll compressor according to claim 4, wherein the high-pressure gaseous refrigerant is distributed within the second annular recess via the first through hole and the second through hole, so as to push the non-orbiting scroll member towards the orbiting scroll member.

6. The scroll compressor according to claim 3, further comprising: an annular sealing piece, wherein the projecting portion penetrates the annular sealing piece and the annular sealing piece is located between the projecting portion and the spacing block.

7. The scroll compressor according to claim 1, further comprising: an annular sealing piece, disposed between an inner wall surface of the spacing block disposed with the first annular recess and the annular pressure piece.

8. The scroll compressor according to claim 1, further comprising: an annular sealing piece, disposed between an outer wall surface of the spacing block disposed with the first annular recess and the annular pressure piece.

9. The scroll compressor according to claim 1, wherein an inner edge of the annular pressure piece has an annular flange.

10. The scroll compressor according to claim 1, wherein an outer edge of the annular pressure piece has an annular flange.

11. The scroll compressor according to claim 1, wherein the frame is fixed to the shell and the transmission shaft is a crank shaft.

12. The scroll compressor according to claim 1, wherein the annular pressure piece has more than two second through holes.

13. The scroll compressor according to claim 1, wherein the second through hole is circular or strip-shaped.

14. The scroll compressor according to claim 13, wherein the annular pressure piece has more than two second through holes.

15. The scroll compressor according to claim 1, wherein an outer edge of the second annular recess is a linear type and an inner edge of the second annular recess is the annular flange.

16. The scroll compressor according to claim 1, wherein the second through holes are distributed on the annular pressure piece in a symmetric manner.

17. The scroll compressor according to claim 1, wherein the spacing block further has a third through hole.

18. The scroll compressor according to claim 17, wherein the projecting portion of the non-orbiting scroll member is inserted in the third through hole.

19. The scroll compressor according to claim 1, wherein the second annular recess communicates with the first through hole and the second through hole.