Stationary scroll and scroll compressors

Abstract

The present invention provides a static scroll and a scroll compressor. The static scroll is used to cooperate with the movable scroll in the scroll compressor, and includes: a static scroll body, a static scroll sidewall connected to the static scroll body, and a static scroll tooth provided on one side of the static scroll body; an air avoidance groove is provided on the static scroll body on the inner periphery of the static scroll sidewall; an oil groove is provided on the static scroll body between the static scroll tooth farthest from the center of the static scroll body and the air avoidance groove; at least one oil inlet hole penetrating the static scroll body is provided at the air avoidance groove, and at least one oil outlet hole penetrating the static scroll sidewall is provided. The present invention adds an oil groove to the support surface of the static scroll, utilizes the movement of the movable scroll to introduce the oil at the bottom of the static scroll through the oil groove into between the movable scroll and the support surface of the static scroll, thereby enhancing the lubrication between the movable scroll and the static scroll end plate, so that the compression efficiency of the compressor can be maximized during the operation of the compressor compression structure, the gas leakage problem during the operation of the dynamic and static scrolls can be reduced, and the overall reliability of the compressor can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a stationary scroll and a scroll compressor. Background Art

[0002] One of the design difficulties in scroll machines is achieving a top seal under all operating conditions and at all speeds within a variable-speed machine. Existing solutions include installing a spiral top seal at the top of the scroll, but the sealing effect of a spiral top seal is unreliable under high-pressure refrigerant conditions; or utilizing the compressed fluid within the compressor to axially move the scroll member toward the opposing scroll. In other practices, in models using high-pressure refrigerants such as CO2, a floating orbiting scroll solution is more effective. To prevent the floating structure of the orbiting scroll from overturning due to uneven forces during operation, the tail end of the scroll of the fixed scroll and the inner portion of the side wall of the fixed scroll are raised to provide support. However, the excessive thickness of the fixed scroll support surface prevents effective infiltration of the refrigerant oil during operation, making it impossible to achieve oil sealing and lubrication. The problem to be solved by the present invention is how to prevent the orbiting scroll from overturning due to the inability of the refrigerant oil to effectively infiltrate the structure during operation, provide oil sealing, and provide cooling.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0004] In response to the problems in the prior art, the purpose of the present invention is to provide a static scroll and a scroll compressor. An oil groove is added to the static scroll of the present invention to enhance the lubrication between the movable scroll and the static scroll end plate, so that the compression efficiency of the compressor can be maximized during the operation of the compressor compression structure, the gas leakage problem during the operation of the movable and static scrolls can be reduced, and the overall reliability of the compressor can be improved.

[0005] A first aspect of the present invention provides a stationary scroll for cooperating with a movable scroll in a scroll compressor, comprising:

[0006] A static disk body, a static scroll sidewall connected to the static disk body, and a static scroll tooth provided on one side of the static disk body;

[0007] An air-avoiding groove is provided on the static disk body on the inner periphery of the static vortex disk side wall;

[0008] An oil groove is provided on the stator body between the stationary scroll tooth farthest from the center of the stator body and the air avoidance groove;

[0009] The air avoidance groove is provided with at least one oil inlet hole penetrating the static disk body, and the side wall of the static scroll is provided with at least one oil outlet hole penetrating the side wall of the static scroll.

[0010] According to the first aspect of the present invention, the width between the fixed scroll farthest from the center of the stator body and the air escape groove is L, and the oil groove is provided at L / 2.

[0011] According to the first aspect of the present invention, the stator body is provided with an air inlet hole, the oil outlet hole is provided on the opposite side of the air inlet hole, and the angle between the line connecting the oil outlet hole and the center of the stator body and the extended line of the line connecting the air inlet hole and the center of the stator body is θ, and θ≤30° is satisfied.

[0012] According to the first aspect of the present invention, the stator body is provided with an air inlet hole, and the oil groove extends from the air inlet hole to the at least one oil outlet hole.

[0013] According to the first aspect of the present invention, the width of the air-avoiding groove along the circumference of the stator body is uniform.

[0014] According to the first aspect of the present invention, the oil inlet hole is arranged opposite to the oil groove.

[0015] According to the first aspect of the present invention, the stator body is provided with an air inlet hole, and the angle β between the line connecting the air inlet hole and the center of the stator body and the line connecting the oil inlet hole and the center of the stator body satisfies β≤30°.

[0016] A second aspect of the present invention provides a scroll compressor comprising a movable scroll and the fixed scroll.

[0017] According to a second aspect of the present invention, the width from the inner side of the air escape groove to the center of the stator body is greater than the width of the inner side of the chamfer of the outer wall of the orbiting scroll.

[0018] According to the second aspect of the present invention, the width from the inner side of the air-avoiding groove to the center of the static disk body is H, which satisfies the width H=R+r±2mm, where R is the radius of the dynamic disk and r is the eccentricity.

[0019] The present invention adds an oil groove on the supporting surface of the static scroll, and utilizes the movement of the orbiting scroll to introduce the oil at the bottom of the static scroll through the oil groove and between the supporting surfaces of the orbiting scroll and the static scroll, thereby enhancing the lubrication between the orbiting scroll and the static scroll end plate, so that the compression efficiency of the compressor can be maximized during the operation of the compressor compression structure, the gas leakage problem during the operation of the orbiting and static scrolls can be reduced, and the overall reliability of the compressor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0021] Figure 1 Schematic diagram of the structure of a static scroll according to an embodiment of the present invention;

[0022] Figure 2 FIG1 is a schematic diagram of a partial structure of a scroll compressor according to an embodiment of the present invention;

[0023] Figure 3 for Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0025] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise mutually incompatible.

[0026] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. Terms indicating relative spaces such as "below" and "above" may be used to more easily explain the relationship of one device relative to another device illustrated in the accompanying drawings. Such terms refer not only to the meaning indicated in the accompanying drawings, but also to other meanings or operations of the device in use. For example, if the device in the accompanying drawings is turned over, a device that was previously described as being "below" another device is described as being "above" the other device. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the terms indicating relative spaces are interpreted accordingly.

[0027] Although the terms first, second, etc. are used herein to represent various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are represented. Furthermore, as used herein, the singular forms "one," "an," and "the" are intended to also include the plural forms, unless the context indicates otherwise. It should be further understood that the terms "comprise" and "include" indicate the presence of the described features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only occur when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0028] Although not defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which this specification belongs. Terms defined in commonly used dictionaries are supplementally interpreted as having meanings consistent with relevant technical literature and current knowledge, and unless otherwise defined, they should not be overly interpreted as ideal or highly formalized meanings.

[0029] The present invention provides a static scroll and a scroll compressor. The static scroll is used to cooperate with the movable scroll in the scroll compressor, and includes: a static scroll body, a static scroll sidewall connected to the static scroll body, and a static scroll tooth provided on one side of the static scroll body; an air avoidance groove is provided on the static scroll body on the inner periphery of the static scroll sidewall; an oil groove is provided on the static scroll body between the static scroll tooth farthest from the center of the static scroll body and the air avoidance groove; at least one oil inlet hole is provided at the air avoidance groove and passes through the static scroll body, and at least one oil outlet hole is provided on the static scroll sidewall and passes through the static scroll sidewall. The present invention adds an oil groove to the support surface of the static scroll, and utilizes the movement of the movable scroll to introduce the oil at the bottom of the static scroll through the oil groove and between the movable scroll and the static scroll support surface, thereby enhancing the lubrication between the movable scroll and the static scroll end plate, so that the compression efficiency of the compressor can be maximized during the operation of the compressor compression structure, the gas leakage problem during the operation of the dynamic and static scrolls can be reduced, and the overall reliability of the compressor can be improved.

[0030] The structure of the static scroll and the scroll compressor of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It will be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0031] The present invention provides a stationary scroll for cooperating with a movable scroll in a scroll compressor. Figure 1 Schematic diagram of the structure of a static scroll according to an embodiment of the present invention. Specifically, the static scroll 1 includes:

[0032] A static plate body 11, a static scroll side wall 12 connected to the static plate body 11, and a static scroll tooth 13 provided on one side of the static plate body 11;

[0033] A clearance groove 16 is provided on the static disk body 11 on the inner periphery of the static scroll side wall 12;

[0034] An oil groove 172 is provided on the stator body 11 between the stationary scroll tooth 13 farthest from the center of the stator body 11 and the air avoidance groove 16; in the present invention, the stator body 11 between the stationary scroll tooth 13 farthest from the center of the stator body 11 and the air avoidance groove 16 is the area that conflicts with the movable scroll of the compressor, which is referred to herein as the support surface of the stationary scroll.

[0035] The air escape groove 16 is provided with at least one oil inlet hole 171 extending through the stator body 11, and the stationary scroll sidewall 12 is provided with at least one oil outlet hole 173 extending through the stationary scroll sidewall 12. The oil inlet hole is used to direct the oil from the oil chamber on the back of the stationary scroll (the end facing away from the orbiting scroll) into the compression chamber, while the oil outlet hole 173 is used to discharge excess refrigeration oil to prevent liquid hammer. Figure 1In the embodiment, an oil inlet hole 171 and an oil outlet hole 173 are provided. The size and number of the oil inlet hole or the oil outlet hole can be set according to the specific structure of the compressor and are not limited here.

[0036] The air gap 16, located between the inner periphery of the stationary scroll sidewall 12 and the support surface of the stationary scroll, can reduce the weight of the entire compressor. In some embodiments, the width of the air gap 16 is uniform along the circumference of the stationary scroll body. This uniform width of the air gap 16 can reduce frictional resistance experienced by moving components during operation, improving the efficiency of the entire compressor. It can also reduce frictional heat generated during the operation of the orbiting scroll, preventing deformation due to overheating and increasing the reliability of the entire compressor.

[0037] Because the support surface of the fixed scroll of the present invention is provided with an oil groove, the width of the support surface can be increased accordingly, thereby increasing the contact area between the fixed scroll and the bottom surface of the orbiting scroll teeth, providing an anti-overturning torque for the orbiting scroll. At the same time, when the floating structure orbiting scroll is in close contact with the support surface of the fixed scroll, the additional oil groove and oil inlet hole can increase the amount of oil return, thereby fully and effectively lubricating the orbiting and fixed scrolls. The fixed scroll of the present invention also has the advantages of simple structure and easy manufacturing.

[0038] In order to improve the reliability of oil and gas supply and fully lubricate and cool the movable scroll and the fixed scroll, in some embodiments, the oil groove 172 is arranged at L / 2, where L is the width between the fixed scroll tooth farthest from the center of the fixed disk body and the air avoidance groove, that is, the oil groove 172 is arranged in the middle of the support surface of the fixed scroll.

[0039] The stator body 11 is usually provided with an air inlet 15 connected to the compressor cavity. The compressed gas sucked in by the air inlet 15 is contained in a certain liquid. In order to further effectively lubricate the supporting surface of all the static scrolls, the oil outlet 173 can be provided on the opposite side of the air inlet 15, and the angle between the connecting line (OP or OP') of the oil outlet 173 and the center of the stator body 11 and the extended line (OO") of the connecting line (OO') of the air inlet 15 and the center of the stator body 11 is θ, and θ≤30°. The oil groove 17 2 can be arc-shaped, extending from the air inlet hole 15 to the at least one oil outlet hole 173, that is, one end of the oil groove 172 is close to the air inlet hole 15, and the other end is close to the oil outlet hole 173. The oil inlet hole 171 and the oil groove 172 are arranged opposite each other, that is, they are arranged on the other side of the line (OO') connecting the air inlet hole 15 and the center of the stator body 11. The angle β between the line (OO') connecting the air inlet hole 15 and the center of the stator body 11 and the line connecting the oil inlet hole 171 and the center of the stator body 11 is satisfied, and β≤30°.

[0040] The present invention also provides a scroll compressor, Figure 2This is a partial structural diagram of a scroll compressor according to an embodiment of the present invention. The scroll compressor includes an orbiting scroll 2 and the aforementioned fixed scroll 1. The orbiting scroll 2 is a floating structure, meaning that it is not secured by any other axial positioning members. Of course, the scroll compressor may also include a front housing, a middle housing housing the fixed and orbiting scrolls, a motor also housed within the middle housing, a rear housing, and other components, which are not described in detail here.

[0041] Figure 3 for Figure 2 A partial enlarged view shows that in order to ensure sufficient supporting force to prevent the movable scroll from overturning, the outer side of the supporting surface of the static scroll in the part of the movable scroll subjected to the overturning force during operation is wider than the inner side of the chamfer A of the outer wall b of the movable scroll, that is, the width from the inner side of the air avoidance groove 16 to the center of the static disk body 11 is greater than the width of the inner side of the chamfer A of the outer wall b of the movable scroll 2.

[0042] Furthermore, the base circle center of the orbiting scroll moves in a circular orbit with a radius of r around the base circle center of the stationary scroll, where r is the eccentricity of the eccentric shaft. The width from the inner side of the air escape groove 16 to the center of the stationary disk body 11 is H, satisfying the width H = R + r ± 2 mm.

[0043] The operation of the scroll compressor of the present invention is that when the return oil of the fixed scroll 1 enters the air-avoiding groove 16 from the oil inlet hole 171, it is deposited downward at the bottom of the fixed scroll by gravity. The clockwise movement of the movable scroll drives the refrigeration oil at the bottom upward to lubricate the supporting surface of the fixed scroll. Figure 3 As shown by the arrow, the refrigerant oil enters the compression chamber through the air inlet 15, thereby improving the sealing of the compression chamber and reducing the leakage of refrigerant gas during the compression process. The CO2 model has a higher rotational speed. The refrigerant oil entering from the oil tank 172 can further absorb the heat generated by the orbiting scroll and the static scroll during high-speed operation, playing a cooling role, thereby improving the reliability of the compressor operation. At the same time, the refrigerant oil flows downward under the action of gravity and settles at the bottom of the static scroll. When the deposited oil exceeds a certain height, it will be discharged from the oil outlet, avoiding excessive accumulation of refrigerant oil in the compression chamber, improving the compression efficiency of the entire machine while reducing the possibility of liquid hammer.

[0044] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A stationary scroll, used to cooperate with a movable scroll in a scroll compressor, characterized in that: include: A static disk body, a static scroll sidewall connected to the static disk body, and a static scroll tooth provided on one side of the static disk body; An air-avoiding groove is provided on the static disk body on the inner periphery of the static vortex disk side wall; An oil groove is provided on the stator body between the stationary scroll tooth farthest from the center of the stator body and the air avoidance groove; The air avoidance groove is provided with at least one oil inlet hole penetrating the static disk body, and the side wall of the static scroll is provided with at least one oil outlet hole penetrating the side wall of the static scroll.

2. The static scroll according to claim 1, characterized in that: The width between the static scroll tooth farthest from the center of the static disk body and the air avoidance groove is L, and the oil groove is arranged at L / 2.

3. The static scroll according to claim 1, characterized in that: The stator body is provided with an air inlet hole, the oil outlet hole is provided on the opposite side of the air inlet hole, and the angle between the line connecting the oil outlet hole and the center of the stator body and the extended line of the line connecting the air inlet hole and the center of the stator body is θ, and satisfies θ≤30°.

4. The stationary scroll according to claim 1, wherein: The static disc body is provided with an air inlet hole, and the oil groove extends from the air inlet hole to the at least one oil outlet hole.

5. The static scroll according to claim 1, characterized in that: The width of the air-avoiding groove along the circumference of the static disk body is consistent.

6. The stationary scroll according to claim 1, characterized in that: The oil inlet hole is arranged opposite to the oil groove.

7. The stationary scroll according to claim 1, characterized in that: The stator body is provided with an air inlet hole. An angle β is formed between a line connecting the air inlet hole and the center of the stator body and a line connecting the oil inlet hole and the center of the stator body, and β≤30°.

8. A scroll compressor, characterized in that: It comprises a movable scroll and a fixed scroll according to any one of claims 1 to 7.

9. The scroll compressor according to claim 8, wherein: The width from the inner side of the avoidance groove to the center of the stator body is greater than the width of the inner side of the chamfer of the outer wall of the movable scroll.

10. The scroll compressor according to claim 8, wherein The width from the inner side of the air-avoiding groove to the center of the static disk body is H, which satisfies the width H=R+r±2mm, where R is the radius of the dynamic disk and r is the eccentricity.

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