Balance block for rotor compressor and rotor compressor
By designing a balance block with specific windward and leeward components in the rotary compressor, the hydrodynamic characteristics are optimized, solving the problem of high fluid resistance of the balance block under high temperature and high pressure, and achieving more efficient compressor operation and lubrication effect.
Patent Information
- Application Number
- CN202410658637.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-11-25
AI Technical Summary
In rotary compressors, the fluid resistance of the balance block is relatively large, especially under high temperature and high pressure conditions, which leads to increased compressor power consumption. The existing balance block design has failed to effectively reduce air resistance.
Design a balance block for a rotary compressor, including a balance body and a windward body. The windward surface of the windward body extends diagonally downward from the top along the circumference, with a gradually changing slope. Combined with the design of the leeward body, the hydrodynamic characteristics are optimized to reduce flow resistance.
By optimizing the hydrodynamic design of the balance block, the refrigerant wobble and separation on the balance block are reduced, flow resistance is lowered, compressor efficiency and lubrication are improved, and refrigeration oil loss is reduced.
Smart Images
Figure CN121007131A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of compressor technology, for example to a balance block for a rotary compressor and a rotary compressor. Background Technology
[0002] In rotary compressors, balance blocks are placed on the upper and lower ends of the motor rotor to balance the eccentric weight of the crankshaft and rollers, achieving static and dynamic balance and reducing compressor vibration and noise levels. As the compressor motor rotor speed increases, the relative rotational speed between the balance blocks and the high-temperature, high-pressure refrigerant inside the compressor also increases, resulting in increased wind resistance and airflow disturbance, thus increasing compressor power consumption.
[0003] To reduce the air resistance of the balance block, a balance block assembly for a compressor is disclosed in the related technology, including a balance block seat and a balance block fixedly connected to the balance block seat. The balance block seat is used to fixally connect to the rotor of the compressor, and the balance block is used to maintain dynamic balance when the crankshaft of the compressor rotates at high speed. The angle between the air-facing surface of the balance block and the balance block seat is greater than 90 degrees.
[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:
[0005] During rotor rotation, the boundary layer on the upper surface of the balance block at the top of the rotor is thicker, which enhances the viscosity effect of the gaseous refrigerant and advances the separation point, thereby increasing air resistance.
[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.
[0008] This disclosure provides a balance block for a rotary compressor and a rotary compressor, to further reduce the fluid resistance of the balance block.
[0009] In some embodiments, the balance block for the rotary compressor includes a balance body and a windward body. The balance body is adapted to be disposed at the top or bottom of the compressor rotor. The balance body has radially convex inner and outer arc surfaces that convex in the same direction. One end of the balance body in the circumferential direction is a first end face. The windward body protrudes outward from the first end face of the balance body in the circumferential direction. The windward body includes a first windward surface that extends obliquely downward from the top of the balance body. The first windward surface includes a first segment, a second segment, and a third segment connected in sequence. The slope of the second segment of the first windward surface is greater than the slope of the first and third segments of the first windward surface.
[0010] In some embodiments, the length of the third segment of the first windward surface is greater than the length of the first segment of the first windward surface.
[0011] In some embodiments, the first segment of the first windward surface is convex upward, and the second segment of the first windward surface is concave downward.
[0012] In some embodiments, the projected area of the second segment of the first windward surface on the first end face is greater than the projected area of the first segment of the first windward surface on the first end face.
[0013] In some embodiments, the windward body further includes a second windward surface, the first end of the second windward surface is connected to the bottom end of the first end face, and the second end of the first windward surface is connected to the second end of the second windward surface, with the connection position being the highest point of the windward body protruding from the first end face.
[0014] In some embodiments, the projection of the second windward surface of the wind-facing body onto the plane containing the first end face is smaller than the projected area of the first windward surface onto the plane containing the first end face.
[0015] In some embodiments, the other end of the balancing body along the circumference is a second end face; the balancing block also includes a leeward body, which protrudes outward from the second end face of the balancing body along the circumference of the balancing body, and the distance by which the leeward body protrudes from the second end face is greater than the distance by which the windward body protrudes outward from the first end face.
[0016] In some embodiments, the leeward body includes a first leeward surface and a second leeward surface, a first end of the first leeward surface is connected to the top of the second end surface, a first end of the second leeward surface is connected to the bottom of the second end surface, and a second end of the first leeward surface is connected to a second end of the second leeward surface, with the connection position being the highest point of the leeward body protruding from the second end surface.
[0017] In some embodiments, the projected area of the first leeward side on the plane where the second end face is located is greater than the projected area of the second leeward side on the plane where the second end face is located.
[0018] In some embodiments, the rotary compressor includes a housing, a rotor, and the aforementioned counterweight, wherein the housing is configured with an accommodating space; the rotor is rotatably disposed in the accommodating space; and the aforementioned counterweight is mounted on the top and / or bottom end of the rotor.
[0019] The balance block and rotary compressor for a rotary compressor provided in this disclosure can achieve the following technical effects:
[0020] The tail vortex and separation of the refrigerant in the balance block occur near the windward body. The laminar boundary layer thickness at the top plane of the balance block is small and the flow is relatively stable. Since the size of the balance block is significantly larger than that of the windward body, reducing the flow resistance of the balance block can reduce the overall flow resistance of the balance block.
[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description
[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:
[0023] Figure 1 This is a schematic diagram of the structure of a balance block for a compressor provided in an embodiment of this disclosure;
[0024] Figure 2 This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure;
[0025] Figure 3 This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure;
[0026] Figure 4 This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure;
[0027] Figure 5 This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure;
[0028] Figure 6 This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure;
[0029] Figure 7This is a schematic diagram of another balance block for a compressor provided in an embodiment of this disclosure.
[0030] Figure label:
[0031] 100: Main body for balancing; 110: First end face; 120: Second end face; 200: Windward body; 210: First windward surface; 211: First section; 212: Second section; 213: Third section; 220: Second windward surface; 230: Outer wall; 240: Inner wall; 300: Leeward body; 310: First leeward surface; 320: Second leeward surface. Detailed Implementation
[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.
[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.
[0034] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.
[0035] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.
[0036] Unless otherwise stated, the term "multiple" means two or more.
[0037] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.
[0038] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.
[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.
[0040] In rotary compressors, balance blocks are placed on the upper and lower ends of the motor rotor to balance the eccentric weight of the crankshaft and rollers, achieving static and dynamic balance and reducing compressor vibration and noise levels. As the compressor motor rotor speed increases, the relative rotational speed between the balance blocks and the high-temperature, high-pressure refrigerant inside the compressor also increases, resulting in increased wind resistance and airflow disturbance, thus increasing compressor power consumption. To reduce the air resistance of the balance blocks, a balance block assembly for compressors is disclosed in related technologies. This assembly includes a balance block seat and a balance block fixedly connected to the seat. The balance block seat is fixedly connected to the compressor rotor, and the balance block maintains dynamic balance during high-speed crankshaft rotation. The angle between the air-facing surface of the balance block and the seat is greater than 90 degrees. The problem with this technology is that during rotor rotation, the boundary layer on the upper surface of the balance block at the top of the rotor is thicker, enhancing the viscosity of the gaseous refrigerant and advancing the separation point, thereby increasing air resistance.
[0041] To further reduce the fluid resistance of the balance block, combined with Figure 1-7As shown, this embodiment of the present disclosure provides a balance block for a rotary compressor. The balance block includes a balance body 100 and a windward body 200. The balance body 100 is adapted to be disposed at the top or bottom of the compressor rotor. The balance body 100 has radially convex inner and outer arc surfaces that convex in the same direction. One end of the balance body 100 along the circumferential direction is a first end face 110. The windward body 200 protrudes outward from the first end face 110 of the balance body 100 along the circumferential direction of the balance body 100. The windward body 200 includes a first windward surface 210, which extends obliquely downward from the top of the balance body 100. The first windward surface 210 includes a first segment 211, a second segment 212, and a third segment 213 connected in sequence. The slope of the second segment 212 of the first windward surface 210 is greater than the slope of the first segment 211 and the third segment 213 of the first windward surface 210.
[0042] In this embodiment of the disclosure, a counterweight is used in a rotary compressor. The rotary compressor includes a housing and a rotor, the rotor being rotatably disposed within the housing. The counterweight is adapted to be mounted on the top and / or bottom of the rotor to balance the eccentric weight of the rotor.
[0043] In this embodiment of the disclosure, "top" and "bottom" refer to the vertically positioned state of the rotor of the rotary compressor. "Radial," "axial," and "circumferential" also refer to the rotor of the rotary compressor. The axial direction is vertical, the radial direction is outward from the center, and the circumferential direction is the direction of rotor rotation.
[0044] The following explanation uses the example of a balance block being installed at the top of a rotary compressor.
[0045] The balance block includes a balance body 100 and an incoming body 200. The balance body 100 has a large weight and plays a major role in balancing the mass of the rotor. The incoming body 200 is connected to the balance body 100 and is mainly used to optimize the hydrodynamics of the balance block.
[0046] Specifically, the balancing body 100 has a top end face and a bottom end face in the axial direction of the rotor, an inner side wall and an outer side wall in the radial direction of the rotor, and a first end face 110 and a second end face 120 in the circumferential direction. The first end face 110 is along the radial direction of the rotor, and the second end face 120 is along the radial direction of the rotor. During rotor rotation, the first end face 110 is the windward side, and the second end face 120 is the leeward side.
[0047] The wind-facing body 200 is disposed on the first end face 110 of the balancing body 100. The wind-facing body 200 protrudes outward from the first end face 110, and the protrusion direction is along the rotation direction of the balancing block.
[0048] The windward body 200 includes a first windward surface 210, the top of which is connected to the top of the balancing body 100, that is, the top of the first end face 110. The first windward surface 210 extends from top to bottom in a direction away from the first end face 110.
[0049] The first windward surface 210 includes a first segment 211, a second segment 212, and a third segment 213 connected sequentially from top to bottom. The slope of the second segment 212 of the first windward surface 210 is greater than the slopes of the first segment 211 and the third segment 213 of the first windward surface 210. The slope is relative to the top plane of the balancing body 100 and can be considered as the angle between the first windward surface 210 and the top plane of the balancing body 100. The smaller the slope, the gentler the first windward surface 210 is at that position; the larger the slope, the steeper the first windward surface 210 is at that position. The first segment 211 and the third segment 213 of the first windward surface 210 are both generally parallel to the top plane of the balancing body 100. The third segment 213 of the first windward surface 210 is more parallel to the first end face 110 of the balancing body 100 than the first segment 211 and the second segment 212.
[0050] When the compressor rotor rotates, the balance block rotates as well. The high-temperature gaseous refrigerant inside the compressor acts as the flow medium for the balance block, generating resistance that inhibits rotor rotation, i.e., fluid resistance. When the high-temperature gaseous refrigerant collides head-on with the balance block, a laminar flow boundary layer is formed in the third section 213 of the first windward surface 210. As it moves along the third section 213 towards the second section 212 of the first windward surface 210, the laminar boundary layer thins in the second section 212 due to the change in slope. When flowing along the second section 212 to the first section 211 of the first windward surface 210, a portion of the refrigerant forms a wake vortex and separates from the laminar boundary layer. That is, the increase and separation of the wake vortex mainly occur at the location of the first section 211 of the first windward surface 210. The remaining refrigerant continues to move along the first section 211 of the first windward surface 210 towards the top plane of the balancing body 100. Since the slope of the first section 211 of the balancing body 100 is small, the flow of the gaseous refrigerant is relatively smooth, and a relatively stable laminar boundary layer can be formed on the top plane of the balancing body 100.
[0051] Using the balance block provided in this embodiment, the refrigerant vortex and separation in the balance block occur near the windward body 200. The laminar boundary layer thickness on the top plane of the balance body 100 is small and the flow is relatively stable. Since the size of the balance body 100 is significantly larger than the size of the windward body, reducing the flow resistance of the balance body 100 can reduce the overall flow resistance of the balance block.
[0052] Optionally, the first segment 211 and the second segment 212 of the first windward surface 210 are smoothly transitioned.
[0053] The greater the abrupt change in the second section 212 of the first windward surface 210, the more pronounced the separation between the wake and the laminar boundary layer formed above the first section 211 of the first windward surface 210. Excessive separation between the wake and the boundary layer formed above the first windward surface 210 will affect the laminar flow formed by the gaseous refrigerant at the top plane of the equilibrium body 100. A smooth transition between the first windward surface 210, the first section 211, and the second section 212 is beneficial for the refrigerant to form a stable laminar boundary layer at the top end face of the equilibrium body 100.
[0054] Optionally, the length of the third segment 213 of the first windward surface 210 is greater than the length of the first segment 211 of the first windward surface 210.
[0055] The third segment 213 of the first windward surface 210, as the foremost point of the windward body 200, first contacts the high-temperature gaseous refrigerant and rectifyes it into laminar flow. The first segment 211 of the first windward surface 210 works in conjunction with the second segment 212 to facilitate the early separation of some refrigerant into microflows, and also guides another portion of the gaseous refrigerant to flow in laminar form to the top plane of the balancing body 100. The third segment 213 of the first windward body 200 is relatively long, which allows it to better perform the rectification function; the first segment 211 of the first windward body 200 is relatively short, which facilitates a smooth transition of the refrigerant from the windward body 200 to the top plane of the balancing body 100.
[0056] Optionally, the first segment 211 of the first windward surface 210 protrudes upward, and the second segment 212 of the first windward surface 210 is concave downward.
[0057] The first segment 211 of the first windward surface 210 protrudes upward, meaning that the first segment 211 of the first windward surface 210 is located outside the plane formed by connecting its upper and lower ends. The upward protrusion of the first segment 211 of the first windward surface 210 facilitates a smooth transition of the refrigerant from the first segment 211 of the first windward surface 210 to the upper surface of the balance body 100.
[0058] The second segment 212 of the first windward surface 210 is concave downward, meaning that the second segment 212 of the first windward surface 210 is located within the plane formed by connecting its upper and lower ends. The concavity of the second segment 212 of the first windward surface 210 facilitates the separation of some refrigerant from the laminar boundary layer above the first segment 211 when it flows from the second segment 212 of the first windward surface 210 to the first segment 211 of the first windward surface 210.
[0059] Optionally, the projected area of the second segment 212 of the first windward surface 210 on the first end face 110 is greater than the projected area of the first segment 211 of the first windward surface 210 on the first end face 110.
[0060] The projected area of each part of the first windward surface 210 on the first end face 110 of the balancing body 100 is positively correlated with the vertical dimensions of each part of the first windward surface 210. The first segment 211 of the first windward surface 210 has a smaller vertical dimension, which is beneficial for the smooth transition of refrigerant from the windward body 200 to the balancing body 100. The second end of the first windward surface 210 has a larger vertical dimension, which is beneficial for guiding the laminar refrigerant formed in the third segment 213 of the first windward surface 210 to the first segment 211 of the first windward surface 210, thereby making the flow of refrigerant at the top of the balancing body 100 more stable and further reducing the fluid resistance of the balancing block.
[0061] Optionally, the windward body 200 also includes a second windward surface 220, the first end of the second windward surface 220 is connected to the bottom end of the first end face 110, and the second end of the first windward surface 210 is connected to the second end of the second windward surface 220. The connection position is the highest point of the windward body 200 protruding from the first end face 110.
[0062] In some related technologies, the air-facing body 200 of the balance block adopts an inclined flow guide form where air-facing surfaces are formed radially from the inner and outer sides of the first end face 110, and the two air-facing surfaces converge towards the center from the inner and outer sides. With this flow guide form, a portion of the refrigerant flowing along the air-facing body 200 forms a vortex located outside the balance block. When the rotor rotates, the refrigerant is thrown to the outside of the rotor, thus forming a high-pressure zone around the rotor and a low-pressure zone in the center closer to the rotor. The vortex formed by the refrigerant along the air-facing body 200 is located outside the balance block, closer to the high-pressure zone around the compressor. In this case, a relatively stable laminar boundary layer is not easily formed on the outside of the air-facing body 200. Even if a laminar boundary layer is formed, the balance block experiences significant fluid resistance due to the interaction of the refrigerant in the surrounding high-pressure zone.
[0063] To guide the refrigerant located directly in front of the windward body 200 to the top of the balancing body 100, the windward surface of the windward body 200 of the balancing block provided in this embodiment includes a first windward surface 210 that is generally inclined from top to bottom. When the compressor rotor rotates, the windward body 200 of the balancing block guides the refrigerant located directly in front of the windward body 200 to the upper side of the balancing body 100. In this way, the wake vortex and laminar boundary layer separation of the balancing block mainly occur above the first windward surface 210, which is conducive to the formation of a relatively stable laminar boundary layer on both the outer side and the top of the balancing block. This can reduce the fluid resistance of the balancing block.
[0064] However, in this situation, the counterweight is subjected to downward pressure from the liquid refrigerant as it rotates, while the refrigerant experiences upward lift. The downward force on the counterweight is transmitted to the compressor rotor, which is detrimental to the rotor's support and lubrication. Furthermore, some of the refrigerant oil is broken up by the compressor rotor or counterweight, forming mist-like oil droplets. These droplets have a relatively high density and, in most cases, can return to the bottom of the compressor under gravity. However, when the refrigerant experiences upward lift, these droplets are easily discharged with the refrigerant from the compressor's exhaust. This affects the compressor's lubrication.
[0065] To reduce compressor refrigerant oil loss, the balance block provided in this embodiment includes a first windward surface 210 and a second windward surface 220. The first windward surface 210 extends obliquely downward from the top of the first end face 110 of the balance body 100, and the second windward surface 220 extends obliquely upward from the bottom of the first end face 110 of the balance body 100 and is connected to the first windward surface 210 of the windward surface 200.
[0066] When the compressor rotor rotates, the interaction between the first air-facing surface 210 and the refrigerant exerts a downward force on the balance block, while the interaction between the second air-facing surface 220 and the refrigerant exerts an upward force on the balance block. This reduces the overall downward pressure of the balance block on the rotor, thus providing better support and lubrication for the compressor rotor. When the rotor rotates, the refrigerant located on the second air-facing surface 220 is not subjected to upward lift, which reduces the amount of refrigerant oil discharged from the compressor discharge port along with the refrigerant, thereby improving the compressor's lubrication effect.
[0067] Optionally, the projection of the second windward surface 220 of the windward body 200 onto the plane where the first end face 110 is located is smaller than the projected area of the first windward surface 210 onto the plane where the first end face 110 is located.
[0068] When the compressor rotor rotates, the refrigerant located directly in front of the second air-facing surface 220 moves downwards under the guidance of the second air-facing surface 220, that is, towards the dead angle formed between the balance body 100 and the air-facing body 200. If the area of the second air-facing surface 220 is large, it is not conducive to the rectification of the refrigerant by the air-facing body 200. The projection of the second air-facing surface 220 of the air-facing body 200 onto the plane where the first end face 110 is located is the second projection, and the projection of the first air-facing surface 210 of the air-facing body 200 onto the plane where the first end face 110 is located is the first projection. The area of the first projection is larger than the area of the second projection. In this way, on the one hand, the air-facing body 200 mainly guides the refrigerant to flow along the balance block through the first air-facing surface 210, which can reduce the fluid resistance of the balance block. Furthermore, the height of the first windward surface 210 protruding from the first end face 110 and the height of the second windward surface 220 protruding from the first end face 110 are such that the area of the first projection is greater than the area of the second projection. Therefore, the overall slope of the first windward surface 210 is less than the overall slope of the second windward surface 220, which can further improve the airflow guiding effect of the first windward surface 210.
[0069] As a way of forming the surface profile of a windward body, optionally, it can be combined with Figure 5 As shown, with the normal direction of the first end face as the Y-axis and a straight line parallel to the axis of the first end face and intersecting the Y-axis as the X-axis, the surface profile of the windward body satisfies the following formula:
[0070] Y = a1X 5 +a2X 4 +a3X 3 +a4X 2 +a5X
[0071] Where X takes values in the range of 0≤X≤D, D is the axial thickness of the balancing body, and a1, a2, a3, a4, and a5 are the shape coefficients of the windward body profile.
[0072] Using the above formula, a surface profile that meets the above shape characteristics can be formed better, which is beneficial to the design and manufacturing of the balance block.
[0073] Optionally, -18≤a1≤-17, 31≤a2≤33, -13≤a3≤-11, -8≤a4≤-7, and 4≤a5≤5.
[0074] With these parameter selections, the balance block exhibits relatively low fluid resistance in simulation experiments.
[0075] As a way of forming the surface profile of a windward body, optionally, it can be combined with Figure 7 As shown, with the normal direction of the first end face as the X-axis and a straight line parallel to the axis of the first end face and intersecting the X-axis as the Y-axis, the first segment of the first windward surface satisfies the following formula:
[0076]
[0077] The surface profile of the third segment of the first windward side satisfies the following formula:
[0078] (X c -δD) 2 +(Y c -D(1-δ)) 2 =((1-δ)D) 2
[0079] Where D is the axial thickness of the main balancing body, and δ is the center positioning coefficient.
[0080] Using the above formula, a surface profile that meets the above shape characteristics can be formed better, which is beneficial to the design and manufacturing of the balance block.
[0081] Optionally, δ = 0.618.
[0082] By selecting these parameters, the fluid resistance of the balance block is relatively small in the simulation experiment.
[0083] Optionally, the second segment of the first windward surface is connected to the first segment and the third segment of the first windward surface, and satisfies the following formula:
[0084] 1 / (D*Dr)≤ρ<∞
[0085] Where ρ is the curvature of the second segment of the first windward surface, and Dr is the curvature coefficient.
[0086] With this configuration, the first and third sections of the first windward body can be connected more smoothly, which helps to reduce the fluid resistance of the balance block.
[0087] Optionally, 0.344≤Dr, the slope of the common tangent between the second and third segments of the first windward side is 0.
[0088] By selecting these parameters, the fluid resistance of the balance block is relatively small in the simulation experiment.
[0089] As a way of forming the surface profile of a windward body, optionally, it can be combined with Figure 6 As shown, with the normal direction of the first end face as the X-axis and a straight line parallel to the axis of the first end face and intersecting the X-axis as the Y-axis, the surface profile of the first segment of the first windward surface satisfies the following formula:
[0090] X1=a1cosθ1
[0091] Y1=D-b1(1-sinθ1)
[0092] The surface profile of the third segment of the first windward side satisfies the following formula:
[0093] X2=a2cosθ2
[0094] Y2=b2(1+sinθ2)
[0095] Where D is the axial thickness of the balancing body, and a1, b1, a2, and b2 are the shape coefficients of the windward body profile.
[0096] Optionally, 2*b1+b2=D, where D is the axial thickness of the balancing body; 0.1≤b2 / D≤0.4; 0.15≤a1 / a2≤0.95; 2.5≤a2 / b2≤5; b1≤a1; 0≤θ1≤π / 2; π / 2≤θ2≤π.
[0097] By selecting these parameters, the fluid resistance of the balance block is relatively small in the simulation experiment.
[0098] Optionally, if the slope of the common tangent line between the first segment and the third segment of the first windward surface is k1, the slope of the common tangent line between the first segment and the second segment of the first windward surface is k2, the slope of the common tangent line between the third segment and the second segment of the first windward surface is k3, and the slope of the tangent line at any point on the second segment of the first windward surface is k4, then:
[0099] k1≤k2<∞;
[0100] 0 <k3≤k1;
[0101] k3≤k4≤k2.
[0102] By selecting these parameters, the fluid resistance of the balance block is relatively small in the simulation experiment.
[0103] Optionally, the second windward surface of the wind-facing body includes a first part and a second part. The surface profile of the first part is constrained by the same formula as the third part of the first windward surface. The top end of the second part is smoothly connected to the bottom end of the first part, and the bottom end of the second part is smoothly connected to the bottom end of the first end face.
[0104] The third segment of the first windward surface and the first part of the second windward surface form the highest point of the outward protrusion of the windward body, and the two are constrained by the same formula, resulting in a smoother line shape. This allows for better guidance of the refrigerant directly in front of the windward body to the upper and lower side walls of the windward body.
[0105] Optionally, the angle between the outer sidewall 230 of the wind-facing body and the first end face 110 is less than 90 degrees, and the angle between the inner sidewall 240 of the wind-facing body and the first end face 110 is less than 90 degrees.
[0106] The first end face is parallel to a radial line of the balancing body. The angle between the outer wall of the wind-facing body and the first end face is less than 90°, and the outer wall of the wind-facing body slopes from the first end face forward and from the outside in. The angle between the inner wall of the wind-facing body and the first end face is less than 90°, and the inner wall of the wind-facing body slopes from the first end face forward and from the outside in. That is, the distance between the first end face and the second end face of the wind-facing body gradually decreases from the first end face forward. Forward refers to the direction of rotation of the balancing body.
[0107] When the refrigerant is primarily guided to the top plane of the balancing block by the windward body, the refrigerant is relatively dense near the top of the balancing block. In the balancing block provided in this embodiment, the inner and outer walls of the windward body also play a guiding role, directing a portion of the refrigerant directly in front of the windward body to the inner and outer walls of the windward body. This arrangement allows for better distribution of the refrigerant in front of the windward body to the top plane, outer walls, and inner walls of the balancing block, thereby enabling the formation of a relatively stable laminar boundary layer on multiple walls of the balancing block and reducing the fluid resistance of the balancing block.
[0108] Optionally, combined Figure 4 As shown, the angle between the outer wall of the wind-facing body and the first end face satisfies the following relationship:
[0109] arctan(2*max(X) / B)≤α;
[0110] Where max(X) is the distance between the far end of the windward body and the first end face, and α is the first included angle between the outer wall of the windward body and the first end face.
[0111] With these parameter selections, the balance block exhibits relatively low fluid resistance in simulation experiments.
[0112] Optionally, the angle between the inner wall of the wind-facing body and the first end face satisfies the following relationship:
[0113] arctan(2*max(X) / B)≤β;
[0114] Where max(X) is the distance between the far end of the windward body and the first end face, and β is the second included angle between the inner wall of the windward body and the first end face.
[0115] With these parameter selections, the balance block exhibits relatively low fluid resistance in simulation experiments.
[0116] Optionally, the thickness of the balancing body along the axial direction is less than its width along the radial direction.
[0117] The axial thickness of the balancing body is relatively small, which reduces the agitation of the gaseous refrigerant by the balancing blocks and helps to reduce the fluid resistance of the balancing blocks. The radial width of the balancing body is relatively large, which allows the balancing blocks to better balance the eccentric weight of the rotor.
[0118] Optionally, the outer wall of the windward body is smoothly connected to the first windward surface, and the outer wall of the windward body is smoothly connected to the second windward surface.
[0119] In this way, the windward body of the balance block can better guide the refrigerant directly in front of the windward body to the outer wall of the balance body, which helps to reduce the fluid resistance of the balance block.
[0120] Optionally, the inner wall of the windward body is smoothly connected to the first windward surface, and the inner wall of the windward body is smoothly connected to the second windward surface.
[0121] In this way, the windward body of the balance block can better guide the refrigerant directly in front of the windward body to the inner wall of the balance body, which helps to reduce the fluid resistance of the balance block.
[0122] Optionally, the other end of the balancing body along the circumference is a second end face; the balancing block also includes a leeward body, which protrudes outward from the second end face of the balancing body along the circumference of the balancing body, and the distance the leeward body protrudes from the second end face is greater than the distance the windward body protrudes outward from the first end face.
[0123] The rotor of a rotary compressor rotates in a fixed direction. After the balance weight is correctly assembled onto the rotor, the first end face of the balance body is always the windward side, and the second end face is always the leeward side. The leeward side is located on the second end face of the balance body, i.e., the leeward side.
[0124] As the refrigerant flows backward along the top end face of the balance block, laminar boundary layer separation occurs after the second end face, forming a wake vortex. The distance the leeward body protrudes from the second end face is greater than the distance the windward body protrudes from the first end face, which can reduce the obstruction to the rotation of the balance block caused by the wake vortex and laminar boundary layer separation, thereby reducing the fluid resistance of the balance block.
[0125] Optionally, the leeward body 300 includes a first leeward surface 310 and a second leeward surface 320. The first end of the first leeward surface 310 is connected to the top of the second end face 120, the first end of the second leeward surface 320 is connected to the bottom of the second end face 120, and the second end of the first leeward surface 310 is connected to the second end of the second leeward surface 320. The connection position is the highest point of the leeward body 300 protruding from the second end face 120.
[0126] The leeward body 300 includes a first leeward surface 310 and a second leeward surface 320. The first leeward surface 310 slopes downward from the top of the second end face 120, and the second leeward surface 320 slopes upward from the bottom of the second end face 120 and is connected to the first leeward surface 310. The connection point between the first leeward surface 310 and the second leeward surface 320 is the highest point where the leeward body 300 protrudes outward from the second end face 120.
[0127] When the compressor rotor rotates, laminar boundary layer separation occurs on the top, inner, and outer planes of the balancing section. The leeward body 300 includes a first leeward surface 310 and a second leeward surface 320, which helps to reduce the obstruction caused by the wake vortices of each surface of the balancing body 100 on the rotation of the windward body, thereby reducing the fluid resistance of the balancing block.
[0128] Optionally, the projected area of the first leeward side 310 on the plane where the second end face 120 is located is greater than the projected area of the second leeward side 320 on the plane where the second end face 120 is located.
[0129] The projection of the first leeward surface 310 of the leeward body 300 onto the plane containing the second end face 120 is the third projection, and the projection of the second leeward surface 320 of the leeward body 300 onto the plane containing the second end face 120 is the fourth projection. The area of the third projection is larger than the area of the fourth projection. The height of the first leeward surface 310 protruding from the second end face 120 is the same as the height of the second leeward surface 320 protruding from the second end face 120. Since the area of the third projection is larger than the area of the fourth projection, the overall slope of the first leeward surface 310 is smaller than the overall slope of the second leeward surface 320. This arrangement can reduce the obstruction caused by the wake vortices of the leeward body 300 on the multiple planes of the balancing body 100 to the rotation of the balancing block.
[0130] This disclosure provides a rotary compressor, which includes a housing, a rotor, and the aforementioned counterweight. The housing has an accommodating space; the rotor is rotatably disposed in the accommodating space; and the aforementioned counterweight is mounted on the top and / or bottom of the rotor.
[0131] When the balance block is placed at the top of the compressor rotor, the bottom of the balance block is in contact with the top surface of the rotor; when the balance block is placed at the bottom of the rotor compressor, the bottom of the balance block is in contact with the bottom surface of the rotor.
[0132] Using the rotary compressor provided in this embodiment, the rotor has less rotational resistance and is less likely to throw refrigerant oil out of the compressor during operation.
[0133] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A balance block for a rotary compressor, characterized in that, include: A balancing body is suitable for being disposed at the top or bottom of the compressor rotor, wherein one end of the balancing body along the circumferential direction is a first end face; The windward body protrudes outward from the first end face of the balancing body along the circumference of the balancing body. The windward body includes a first windward surface, which extends obliquely downward from the top of the balancing body. The first windward surface includes a first segment, a second segment, and a third segment connected in sequence. The slope of the second segment of the first windward surface is greater than the slope of the first and third segments of the first windward surface.
2. The balance block according to claim 1, characterized in that, The length of the third segment of the first windward surface is greater than the length of the first segment of the first windward surface.
3. The balance block according to claim 1, characterized in that, The first section of the first windward surface bulges upward, and the second section of the first windward surface is concave downward.
4. The balance block according to claim 1, characterized in that, The projected area of the second segment of the first windward surface on the first end face is greater than the projected area of the first segment of the first windward surface on the first end face.
5. The balance block according to claim 1, characterized in that, The windward body also includes a second windward surface, the first end of the second windward surface is connected to the bottom end of the first end face, and the second end of the first windward surface is connected to the second end of the second windward surface. The connection position is the highest point of the windward body protruding from the first end face.
6. The balance block according to claim 5, characterized in that, The projection of the second windward surface of the wind-facing body onto the plane containing the first end face is smaller than the projected area of the first windward surface onto the plane containing the first end face.
7. The balance block according to any one of claims 1 to 6, characterized in that, The other end of the circumferentially oriented balancing body is the second end face; The balance block also includes: The leeward body protrudes outward from the second end face of the balancing body along the circumference of the balancing body, and the distance by which the leeward body protrudes from the second end face is greater than the distance by which the windward body protrudes outward from the first end face.
8. The balance block according to claim 7, characterized in that, The leeward body includes a first leeward surface and a second leeward surface. The first end of the first leeward surface is connected to the top of the second end surface, and the first end of the second leeward surface is connected to the bottom of the second end surface. The second end of the first leeward surface is connected to the second end of the second leeward surface, and the connection position is the highest point of the leeward body protruding from the second end surface.
9. The balance block according to claim 8, characterized in that, The projected area of the first leeward side on the plane where the second end face is located is greater than the projected area of the second leeward side on the plane where the second end face is located.
10. A rotary compressor, characterized in that, include: The shell has a structure that provides accommodating space; The rotor is rotatably disposed in the accommodating space; and, The balance block as described in any one of claims 1 to 9 is mounted on the top and / or bottom of the rotor.