CN117469166A

CN117469166A - Scroll cover and scroll compressor

Info

Publication number: CN117469166A
Application number: CN202310939588.6A
Authority: CN
Inventors: 孙玉松; 张喜双; 李伟; 刘三祥; 高红军; 叶航
Original assignee: Danfoss Tianjin Ltd
Current assignee: Danfoss Tianjin Ltd
Priority date: 2022-07-29
Filing date: 2023-07-28
Publication date: 2024-01-30

Abstract

The invention provides a scroll cover (1), which comprises a peripheral wall (11) and a cavity (12) formed on the inner side of the peripheral wall (11), wherein the cavity (12) is used for accommodating a scroll. At least one discharge hole (14) is provided in the peripheral wall (11), the discharge hole (14) penetrating the peripheral wall (11) in a thickness direction of the peripheral wall (11) to allow fluid from the scroll to be discharged from an inner side of the peripheral wall (11) to an outer side of the peripheral wall (11) via the discharge hole (14). The invention also provides a scroll compressor (100), in particular a co-rotating scroll compressor, employing the scroll cover (1).

Description

Scroll cover and scroll compressor

Technical Field

The present invention relates to a scroll cover and a scroll compressor employing the same.

Background

In a scroll compressor, particularly a co-rotating scroll compressor (CRC), a portion of lubricating oil may accumulate in a space outside an oil sump of the scroll compressor due to pressure and centrifugal force, and may increase the risk of losing oil of the scroll compressor, thereby adversely affecting a refrigeration effect, an Oil Circulation Rate (OCR), an input power, an Energy Efficiency Ratio (EER), and the like of the scroll compressor.

Disclosure of Invention

[ problem ]

The present invention has been made to solve the above technical problems, and other technical problems that are potential.

[ technical solution ]

According to one aspect of the present invention, a scroll cover for a scroll compressor is provided. The scroll compressor includes a scroll plate. The scroll cover includes a peripheral wall and a chamber formed inside the peripheral wall for accommodating the scroll. At least one discharge hole is provided in the peripheral wall, the discharge hole penetrating the peripheral wall in a thickness direction of the peripheral wall to allow fluid from the scroll to be discharged from an inner side of the peripheral wall to an outer side of the peripheral wall via the discharge hole.

Specifically, a plurality of discharge holes are provided in the peripheral wall. The plurality of discharge holes are uniformly distributed at equal center angle intervals in the circumferential direction of the peripheral wall.

Optionally, a plurality of crescent-shaped cavities and a plurality of unidirectional flow channels are arranged on the end face of the peripheral wall, wherein each unidirectional flow channel corresponds to one cavity respectively. In the circumferential direction of the peripheral wall, the plurality of cavities are uniformly distributed at equal center angle intervals. One side of the cavity is open to the chamber to allow fluid in the chamber to flow into the cavity, and the other side of the cavity is in communication with the unidirectional flow channel. One end of the unidirectional flow channel communicates with the cavity and the other end of the unidirectional flow channel communicates with the outside of the peripheral wall to allow fluid from the cavity to drain unidirectionally from the cavity to the outside of the peripheral wall.

Optionally, a first and/or second locating pin hole and/or a weight port are provided in the scroll cover. The first locating pin hole is used for locating the scroll in the chamber. The second registration pin holes are used for locating the scroll cover on the component supporting the scroll cover. The weight ports may be filled with weight material or may be left hollow without being filled with weight material.

Alternatively, the scroll cover may be constructed of an aluminum alloy or cast iron (e.g., ductile iron).

According to another aspect of the present invention, a scroll compressor is provided. The scroll compressor includes: a first scroll; the second scroll plate and the first scroll plate are matched with each other to form a compression cavity, and the second scroll plate can rotate together with the first scroll plate; a flange slidably contacting and supporting the second scroll, and the flange being directly or indirectly connected to the first scroll; the motor can drive the flange to rotate so as to drive the first vortex plate to rotate; and a scroll cover according to the previous aspect, a chamber of the scroll cover accommodates the first scroll and the second scroll.

Specifically, the first scroll is fixedly connected to the scroll cover, and the scroll cover is fixedly connected to the flange such that the first scroll also rotates when the motor drives the flange to rotate. The first scroll drives the second scroll to rotate.

Specifically, the first vortex plate is arranged above the second vortex plate, the second vortex plate is arranged above the flange, and the height of the discharge hole is higher than or equal to the height of the contact surface of the flange and the second vortex plate.

Optionally, at least one additional drain hole is provided in the flange, the additional drain hole allowing fluid to drain from the chamber to the outside of the flange.

Optionally, a positioning hole corresponding to the second positioning pin hole is arranged on the flange. The scroll cover is positioned relative to the flange by means of positioning pins inserted in the positioning holes of the flange and in the second positioning pin holes.

Optionally, the scroll cover is integrally formed with the first scroll by casting.

[ technical Effect ]

By adopting the technical scheme of the invention, the condition of lubricating oil accumulation described above can be reduced or eliminated, so that the refrigeration effect, the Oil Circulation Rate (OCR), the input power and the Energy Efficiency Ratio (EER) and the like of the scroll compressor are improved.

Drawings

In order to facilitate an understanding of the invention, the invention is described in more detail below on the basis of exemplary embodiments in connection with the accompanying drawings. The same or similar reference numbers are used in the drawings to refer to the same or like parts. It should be understood that the drawings are merely schematic and that the dimensions and proportions of the components in the drawings are not necessarily accurate.

Fig. 1 is a partial longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present invention.

Parts (a) and (b) of fig. 2 are an assembled view and an exploded view, respectively, of a scroll assembly in the scroll compressor shown in fig. 1.

Fig. 3A and 3B are perspective views of a scroll cover according to an exemplary embodiment of the present invention.

Fig. 4A is a longitudinal cross-sectional view of a scroll cover according to an exemplary embodiment of the present invention.

Fig. 4B is a longitudinal cross-sectional view of an assembly of a scroll cover and an active scroll in accordance with an exemplary embodiment of the present invention.

Fig. 5 is a partial longitudinal sectional view of a scroll compressor according to another exemplary embodiment of the present invention.

Detailed Description

Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

In the co-rotating scroll compressor, between the two scrolls and between the contact surfaces of the flange and the driven scroll are separated to the outer peripheral sides of the driving scroll and the driven scroll, and are accumulated in a space commonly surrounded by the scroll cover, the scroll, and the flange. These lubricating oils may return to the compression pockets of the driving and driven scrolls, either creating resistance to the rotation of the scrolls, or increasing the risk of losing oil from the oil sump of the compressor. This is disadvantageous for the refrigeration effect of the scroll compressor, oil Circulation Rate (OCR), input power and Energy Efficiency Ratio (EER), etc.

Accordingly, it is desirable to reduce or eliminate the above-described lubricant accumulation.

Fig. 1 is a partial longitudinal cross-sectional view of a scroll compressor, such as a co-rotating scroll compressor (CRC), according to an exemplary embodiment of the present invention. Parts (a) and (b) of fig. 2 are an assembled view and an exploded view, respectively, of a scroll assembly in the scroll compressor shown in fig. 1.

As shown in fig. 1 and 2, the scroll compressor 100 mainly includes a housing 5 and a scroll cover 1, a first scroll 2, a second scroll 3, a flange 4, and a motor 6 provided in the housing. In addition, a mask 51 may be provided on the outer sides of the first scroll 2 and the second scroll 3.

In the present exemplary embodiment, as shown in fig. 1, the first scroll 2 is an active scroll, and the second scroll 3 is an inactive scroll. The first scroll 2 is provided with a wrap 21 on a lower surface thereof and the second scroll 3 is provided with a wrap 32 on an upper surface thereof. The first scroll 2 is arranged above the second scroll 3, and the second scroll 3 is arranged above the flange 4. The second scroll 3 and the first scroll 2 cooperate with each other to form a compression chamber 22 at the center, and the second scroll 3 is rotatable together with the first scroll 2.

The scroll cover 1 includes a peripheral wall 11 and a chamber 12 formed inside the peripheral wall 11. The chamber 12 is for accommodating the first scroll 2 and the second scroll 3. As shown in fig. 2, a plurality of through holes 15 are provided in the outer peripheral region of the scroll cover 1, and a plurality of screw holes 42 are provided in the outer peripheral region of the flange 4, and the plurality of screw holes 42 may be aligned one by one with the plurality of through holes 15. The lower surface 16 of the outer peripheral region (i.e., peripheral wall 11) of the scroll cover 1 abuts against the upper surface of the outer peripheral region of the flange 4. A plurality of bolts 17 are screwed into the respective threaded holes 42 via the respective through holes 15, thereby fixing the first scroll 2 to the flange 4. The upper surface 41 of the flange 4 slidably contacts and supports the second scroll 3. The motor 6 can drive the flange 4 and thus the first scroll 2 to rotate. In addition, the material constituting the scroll cover 1 and the surface treatment process may be appropriately selected according to actual needs. For example, it may be an aluminum alloy or cast iron material (e.g., ductile iron). Furthermore, the scroll cover 1 may be integrally formed with the first scroll 2 by casting

When the flange 4, the first scroll 2, and the second scroll 3 are rotated, the oil screw 7 is rotated by the second scroll 3, and the lubricating oil is transferred from an oil sump (not shown) located at the bottom of the scroll compressor 100 to the flange 4, the first scroll 2, and the second scroll 3. Under the action of pressure and centrifugal force, a part of the lubricating oil separates radially outward from between the first scroll 2 and the second scroll 3 and between the contact surfaces of the flange 4 and the second scroll 3, and accumulates in the space S shown in fig. 1. These lubricating oils may return to the compression chamber 22 or create resistance to the rotation of the first scroll 2 and the second scroll 3 or increase the risk of losing oil from the oil sump. This is disadvantageous to the refrigeration effect, oil Circulation Rate (OCR), input power, energy Efficiency Ratio (EER), etc. of the scroll compressor 100.

Fig. 3A and 3B are perspective views of a scroll cover according to an exemplary embodiment of the present invention. Fig. 4A is a longitudinal cross-sectional view of a scroll cover according to an exemplary embodiment of the present invention. Fig. 4B is a longitudinal cross-sectional view of an assembly of a scroll cover and an active scroll in accordance with an exemplary embodiment of the present invention. Note that the cross-sectional plane of fig. 4A and the cross-sectional plane of fig. 4B are perpendicular to each other.

As shown in fig. 3A to 4B, in order to reduce or eliminate the above-described case where lubricating oil is accumulated in the space S, in the exemplary embodiment of the present invention, at least one discharge hole 14 (two discharge holes 14 are shown in fig. 3A to 4A) is provided in the peripheral wall 11 of the scroll cover 1. The discharge hole 14 penetrates the peripheral wall 11 in the thickness direction of the peripheral wall 11 to allow the lubricating oil from the scroll 2, 3 to be discharged from the inside of the peripheral wall 11 to the outside of the peripheral wall 11 via the discharge hole 14. The lubricant discharged from the discharge hole 14 is further returned to the sump via a lubricant collecting device and a dedicated return passage (not shown). When a plurality of discharge holes 14 are provided in the peripheral wall 11, the plurality of discharge holes 14 may be uniformly distributed at equal center angle intervals in the circumferential direction of the peripheral wall 11.

In addition, as shown in fig. 3B, a plurality of crescent-shaped cavities 18 and a plurality of unidirectional flow passages 19 are provided on the end face 16 of the peripheral wall 11, wherein each unidirectional flow passage 19 corresponds to one cavity 18. The plurality of cavities 18 are uniformly distributed at equal center angle intervals in the circumferential direction of the peripheral wall 11. One side of the cavity 18 is open to the chamber 12 to allow fluid in the chamber 12 to flow into the cavity 18, and the other side of the cavity 18 is in communication with a unidirectional flow passage 19. One end of the unidirectional flow passage 19 communicates with the cavity 18, and the other end of the unidirectional flow passage 19 communicates with the outside of the peripheral wall 11 to allow fluid from the cavity 18 to be discharged unidirectionally from the cavity 18 to the outside of the peripheral wall 11.

When the scroll compressor 100 rotates at a high speed, a portion of the lubricating oil accumulated in the space S may be thrown into the crescent-shaped cavity 18 by centrifugal force. In this way, a part of the lubricating oil accumulated in the space S can be discharged from the inside of the peripheral wall 11 to the outside of the peripheral wall 11 via the discharge hole 14 as described above, and another part of the lubricating oil can be discharged to the outside of the peripheral wall 11 via the unidirectional flow passage 19.

In particular, the flow path structure of the unidirectional flow passage 19 is designed to ensure that lubricating oil or refrigerant gas or the like can flow only unidirectionally from the unidirectional flow passage 19, and cannot flow back into the cavity 18 from the outside of the peripheral wall 11.

In addition, as shown in part (B) of fig. 2, fig. 3A and 3B, a first registration pin hole 10 and/or a second registration pin hole 161 and/or a weight port 162 are provided in the scroll cover 1.

The first registration pin holes 10 are used in conjunction with the registration pins 8 for locating the scroll in the chamber 12.

The second registration pin hole 161 is used in conjunction with the registration pin 8 for locating the scroll cover 1 on the component (flange 4 in this exemplary embodiment) supporting the scroll cover 1. Specifically, the flange 4 is provided with positioning holes 44 corresponding to the second positioning pin holes 161. The scroll cover 1 is positioned with respect to the flange 4 by means of the positioning pins 8 inserted in the positioning holes 44 of the flange 4 and the second positioning pin holes 161.

In addition, in order to improve dynamic balance characteristics of the supporting scroll cover 1, the weight port 162 may be filled with an appropriate weight material or the weight port 162 may be maintained in a hollow state without filling the weight material as appropriate.

As shown in fig. 4B, the first scroll 2 is fixedly mounted to the scroll cover 1 so as to rotate together with the scroll cover 1. A through hole 13 is provided at the top of the scroll cover 1 to allow refrigerant to pass through the through hole 13.

As shown in fig. 1, 4A and 4B, the discharge hole 14 is located at a height slightly higher than or the same as the height of the contact surface of the flange 4 and the second scroll 3 (i.e., the height of the upper surface 41 of the flange 4). In this way, it is ensured that the discharge hole 14 communicates the space S with the outside of the peripheral wall 11.

When the flange 4, the first scroll 2, and the second scroll 3 rotate, the lubricating oil accumulated in the space S is discharged from the inside of the peripheral wall 11 to the outside of the peripheral wall 11 via the discharge hole 14 by centrifugal force. The lubricating oil discharged to the outside of the peripheral wall 11 flows downward by the gravity and the blocking effect of the shroud 51, and finally flows back into the oil sump of the scroll compressor. The lubricating oil also falls on the motor 6 during the return to the oil sump and cools the motor 6.

The above describes the case where the discharge hole 14 is provided in the peripheral wall 11 of the scroll cover 1. In addition to the above, additional drain holes may also be provided in the flange 4, as described below with reference to fig. 5.

Fig. 5 is a partial longitudinal sectional view of a scroll compressor according to another exemplary embodiment of the present invention. The embodiment shown in fig. 5 differs from the previously described embodiment in that: at least one discharge opening 43 is provided in the flange 4. The drain hole 43 communicates the upper surface 41 of the flange 4 (see fig. 1, a portion of the upper surface 41 is used as a thrust surface) with the outside of the bottom surface of the flange 4. In this way, the lubricating oil accumulated on the thrust surface is discharged to the outside of the bottom surface of the flange 4 via the discharge hole 43. The lubricant discharged from the discharge hole 43 is further returned to the sump via a lubricant collecting device and a dedicated return passage (not shown).

By adopting the technical solution of the above-described exemplary embodiment of the present invention, it is possible to i) avoid the return of the lubricating oil accumulated in the space S into the compression chamber 22, thereby improving volumetric efficiency and improving the refrigerating effect of the scroll compressor; ii) improving OCR, which can be kept at a level of 0-10%; iii) Reducing input power, improving Energy Efficiency Ratio (EER); iv) better cooling of the motor 6.

Although the technical objects, aspects and effects of the present invention have been described in detail hereinabove with reference to specific embodiments and modifications, it should be understood that the above-described embodiments and modifications are illustrative only and not limiting. Any modifications, equivalent substitutions, and improvements made by those skilled in the art are intended to be included within the spirit and principles of the present invention.

Claims

1. A scroll cover (1) of a scroll compressor including a scroll, characterized in that,

the scroll cover comprises a peripheral wall (11) and a chamber (12) formed on the inner side of the peripheral wall (11), wherein the chamber (12) is used for accommodating the scroll,

at least one discharge hole (14) is provided in the peripheral wall (11), the discharge hole (14) penetrating the peripheral wall (11) in a thickness direction of the peripheral wall (11) to allow fluid from the scroll to be discharged from an inner side of the peripheral wall (11) to an outer side of the peripheral wall (11) via the discharge hole (14).

2. A scroll cover (1) according to claim 1, characterized in that,

a plurality of discharge holes (14) are provided in the peripheral wall (11),

the plurality of discharge holes (14) are uniformly distributed at equal center angle intervals in the circumferential direction of the peripheral wall (11).

3. Scroll cover (1) according to claim 1 or 2, characterized in that,

a plurality of crescent-shaped cavities (18) and a plurality of unidirectional flow channels (19) are arranged on the end face (16) of the peripheral wall (11), wherein each unidirectional flow channel (19) corresponds to one cavity (18) respectively,

in the circumferential direction of the peripheral wall (11), a plurality of the cavities (18) are uniformly distributed at equal center angle intervals,

one side of the cavity (18) is open towards the chamber (12) to allow fluid in the chamber (12) to flow into the cavity (18), and the other side of the cavity (18) is in communication with the unidirectional flow channel (19),

one end of the unidirectional flow channel (19) communicates with the cavity (18), and the other end of the unidirectional flow channel (19) communicates with the outside of the peripheral wall (11) to allow fluid from the cavity (18) to be discharged unidirectionally from the cavity (18) to the outside of the peripheral wall (11).

4. A scroll cover (1) according to claim 1, characterized in that,

the scroll cover (1) is provided with:

a first locating pin hole (10), the first locating pin hole (10) being used for locating the scroll in the chamber (12); and/or

A second registration pin hole (161), the second registration pin hole (161) being used for positioning the scroll cover (1) on a member supporting the scroll cover (1); and/or

A weight port (162), wherein the weight port (162) is filled with weight material or is not filled with weight material.

5. A scroll cover (1) according to claim 1, characterized in that,

the scroll cover (1) is made of aluminum alloy or cast iron.

6. A scroll compressor (100), comprising:

a first scroll (2);

-a second scroll (3), the second scroll (3) and the first scroll (2) cooperating with each other to form a compression chamber (22), and the second scroll (3) being rotatable with the first scroll (2);

-a flange (4), said flange (4) slidably contacting and supporting said second scroll (3), and said flange (4) being directly or indirectly connected to said first scroll (2); and

a motor (6), wherein the motor (6) can drive the flange (4) to rotate, and further drive the first vortex plate (2) to rotate;

wherein the scroll compressor (100) further comprises a scroll cover (1) according to any one of claims 1 to 5, a chamber (12) of the scroll cover (1) accommodating the first scroll (2) and the second scroll (3).

7. The scroll compressor (100) according to claim 6, wherein,

the first scroll (2) is fixedly connected to the scroll cover (1), and the scroll cover (1) is fixedly connected to the flange (4) so that the first scroll (2) also rotates when the motor (6) drives the flange (4) to rotate, the first scroll driving the second scroll to rotate.

8. The scroll compressor (100) according to claim 7, wherein,

the first vortex plate (2) is arranged above the second vortex plate (3), the second vortex plate (3) is arranged above the flange (4), and

the height of the discharge hole (14) is higher than or equal to the height of the contact surface of the flange (4) and the second vortex plate (3).

9. The scroll compressor (100) according to claim 7, wherein,

at least one additional discharge hole (43) is provided in the flange (4), said additional discharge hole (43) allowing fluid to be discharged from the chamber (12) to the outside of the flange (4).

10. The scroll compressor (100) according to claim 6, wherein,

positioning holes (44) corresponding to the positioning pin holes (161) on the vortex disc cover (1) are arranged on the flange (4),

the scroll cover (1) is positioned relative to the flange (4) by means of positioning pins (8) inserted into the positioning holes (44) and the positioning pin holes (161) of the flange (4).

11. The scroll compressor (100) according to claim 6, wherein,

the scroll cover (1) and the first scroll (2) are integrally formed through casting.