A three-stage dynamic balancing system balancing block, dynamic balancing assembly and compressor

Abstract

The utility model provides a kind of three-section dynamic balancing system is used balance block, dynamic balancing assembly and compressor, the balance block is set between main balance block and rotor lower balance block, three-section dynamic balancing system is used balance block and includes connecting portion, three-section dynamic balancing system is used balance block and is set in dynamic balancing assembly by connecting portion;Protruding portion, protrude from the end surface of connecting portion along the axial direction of three-section dynamic balancing system is used balance block, the projection of protruding portion in axial direction falls into the projection of connecting portion in axial direction.The balance block can make the two-section structure of original dynamic balance improve into three-section structure, can reduce the upper stress burden of crankshaft, make shafting stress more balanced distribution, reduce deflection in the process of crankshaft operation;By sharing part of the weight of main balance block, the volume and weight of main balance block in original structure are reduced, meet the high rotation demand of compressor, and air flow agitation when rotating can be reduced, beneficial to oil-gas separation, reduce oil discharge rate.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to a balance block, dynamic balancing components and compressor for a three-stage dynamic balancing system. Background Technology

[0002] Scroll compressors achieve gas compression through the meshing of moving and stationary scrolls. During operation, the moving scroll is driven by an eccentric crankshaft, and its eccentric motion generates unbalanced rotational inertial forces and torques. To ensure the dynamic balance of the compressor's moving mechanism, balance weights are used to counteract these unbalanced forces and torques.

[0003] In traditional compressor design, a two-stage balancing scheme is typically used, where the main balancing block at the bottom of the frame and the auxiliary balancing block at the bottom of the rotor work together to balance inertial forces and inertial torques. However, due to its large size and weight, the main balancing block can disturb the airflow near the exhaust port during high-speed operation, leading to an increase in the refrigerant oil content in the compressor exhaust and an increased oil discharge rate, thereby reducing the compressor's operational reliability. Furthermore, the weight of the balancing block is concentrated in the upper part of the shaft system, resulting in uneven force distribution and potentially increasing the deflection in the middle of the crankshaft, affecting balance stability.

[0004] As competition intensifies in the VRF (Variable Refrigerant Flow) air conditioning market, manufacturers are increasingly demanding higher compressor speeds, from 130 rpm to 160 rpm or even higher. This increased speed leads to a significant increase in rotational inertia and torque, necessitating a corresponding increase in the size and weight of the counterweight, further exacerbating uneven stress on the upper shaft and airflow disturbance at the exhaust port. Simultaneously, the continuous increase in scroll compressor displacement results in a rising oil discharge rate, causing more refrigerant oil to be lost with the exhaust, reducing the oil level at the bottom of the compressor, and posing a potential risk to operational reliability.

[0005] Therefore, it is necessary to design a balance block that can improve a two-stage dynamic balancing system into a three-stage dynamic balancing system in order to solve the above problems. Utility Model Content

[0006] In view of this, in order to overcome the defects of the prior art, this utility model provides a balance block, dynamic balancing components and compressor for a three-stage dynamic balancing system, which effectively solves the problem that the large mass of the existing main balance block causes disturbance of the airflow near the exhaust port, resulting in an increase in the content of refrigeration oil in the compressor exhaust, an increase in the oil discharge rate, and thus a reduction in the reliability of compressor operation.

[0007] According to a first aspect of the present invention, a three-section dynamic balancing block is provided for use in a dynamic balancing assembly. The dynamic balancing assembly includes a main balancing block and a rotor lower balancing block. The three-section dynamic balancing block is disposed between the main balancing block and the rotor lower balancing block. The three-section dynamic balancing block includes a connecting portion, which is disposed in the dynamic balancing assembly through the connecting portion; and a protruding portion, which protrudes from the end face of the connecting portion along the axial direction of the three-section dynamic balancing block, the projection of the protruding portion in the axial direction falling within the projection of the connecting portion in the axial direction.

[0008] Preferably, the balance block of the three-section dynamic balancing system includes at least two protrusions, and at least two of the protrusions protrude sequentially from the end face of the connecting part or the end face of adjacent protrusions along the axial direction.

[0009] Preferably, the projected area of ​​the plurality of protrusions in the axial direction decreases sequentially.

[0010] Preferably, the connecting portion includes an inner arc side, an outer arc side, and an arc transition end connecting the inner arc side and the outer arc side, wherein the arc transition end is tangent to the inner arc side and the outer arc side.

[0011] Preferably, the outer arc surface of the protrusion is coplanar with the outer wall of the outer arc side of the connecting part.

[0012] According to a second aspect of the present invention, a dynamic balancing assembly is provided, wherein the dynamic balancing assembly includes a balancing block for a three-section dynamic balancing system as described above.

[0013] Preferably, the dynamic balancing assembly further includes a rotor lower balancing block, the structure of which is the same as that of the balancing block used in the three-section dynamic balancing system.

[0014] Preferably, the dynamic balancing assembly further includes a motor rotor and a main balancing block, wherein the three-section dynamic balancing system balancing block and the rotor lower balancing block are respectively disposed at both ends of the motor rotor in the axial direction; the protrusion of the three-section dynamic balancing system balancing block extends toward the main balancing block.

[0015] Preferably, the dynamic balancing assembly further includes a crankshaft through which the main balance block passes, and the inner wall of the three-section dynamic balancing system balance block abuts against the crankshaft; the main balance block and the three-section dynamic balancing system balance block are located on the same side of the crankshaft, and the main balance block and the three-section dynamic balancing system balance block have the same installation angle relative to the crankshaft.

[0016] According to a third aspect of the present invention, a compressor is provided, wherein the compressor includes the dynamic balancing assembly as described above.

[0017] The three-section dynamic balancing system of this utility model uses a balance block. Through the cooperation of the connecting part and the protruding part, the original two-section dynamic balancing structure is improved into a three-section structure. This reduces the stress burden on the upper part of the crankshaft, makes the stress more balanced, and thus makes the stress distribution of the shaft system more even, reducing the deflection of the crankshaft during operation. At the same time, due to the addition of the new balancing structure, part of the weight of the main balance block can be shared. Therefore, the size and weight of the main balance block in the original structure can be reduced to meet the high rotation requirements of the existing compressor and reduce the agitation of the airflow at the internal exhaust port during high-speed rotation. The protruding part protruding from the connecting part can fully agitate the gas mixture of refrigerant and refrigeration oil and throw oil during rotation, which is conducive to oil-gas separation and reduces the oil discharge rate.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a balance block for a three-section dynamic balancing system according to an embodiment of the present invention is shown; Figure 2 This diagram shows another structural schematic of a balance block for a three-section dynamic balancing system according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a dynamic balancing assembly according to an embodiment of the present invention is shown; Figure 4 A top view of a dynamic balancing assembly according to an embodiment of the present invention is shown; Figure 5 A side view of a dynamic balancing assembly according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the compressor according to an embodiment of the present invention is shown.

[0021] Reference numerals: 1-Balance block body; 101-Connecting part; 102-Protrusion; 103-Inner arc side; 104-Outer arc side; 105-Circular arc transition end; 2-Main balance block; 3-Lower balance block of rotor; 4-Motor rotor; 5-Crankshaft; S1-First direction. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] According to a first aspect of this utility model, a balance block for a three-section dynamic balancing system is provided, such as... Figures 1 to 6 As shown, this three-section dynamic balancing system uses balance blocks as the dynamic balancing component of the compressor. The dynamic balancing component can be, for example, a commonly used existing component in the compressor, including the main balance block 2, the lower rotor balance block 3, the motor rotor 4, and the crankshaft 5, as shown. Figure 6 As shown, the main balancing block 2, the motor rotor 4, and the lower rotor balancing block 3 are sequentially mounted on the crankshaft 5 from top to bottom. The existing dynamic balancing assembly is a two-stage balancing structure where the main balancing block 2, located at the bottom of the compressor frame, and the lower rotor balancing block 3, located at the bottom of the motor rotor 4, jointly balance inertial forces and inertial torques. This three-stage dynamic balancing system improves the original two-stage balancing structure into a three-stage balancing structure by adding an additional balancing block body 1 to the upper part of the motor rotor 4. This reduces the weight and volume of the main balancing block 2, avoiding excessive agitation of the airflow near the exhaust port and thus preventing an increase in oil discharge rate. The three-stage dynamic balancing system balancing block includes a connecting part 101 and a protruding part 102.

[0027] In the following description, reference will be made to Figures 1 to 6 The detailed structure of the connecting part 101 and the protrusion 102 of the balance block in the three-section dynamic balancing system is described in detail.

[0028] like Figures 1 to 4 As shown in the embodiment, the three-section dynamic balancing system uses a balance block (i.e., the balance block body 1 in the figure) positioned between the main balance block 2 and the lower rotor balance block 3 to form a three-section dynamic balancing structure. This results in a more balanced distribution of forces on the shaft system and reduces the deflection of the crankshaft 5 during operation. Specifically, the balance block of the three-section dynamic balancing system is mounted on the dynamic balancing assembly via a connecting part 101, specifically positioned on the upper part of the motor rotor 4. The connecting part 101 can be formed into an arc-shaped structure, with rivet holes (not shown in the figure) on the side of the arc-shaped structure facing the motor rotor 4. Corresponding rivet holes are also provided on the upper part of the motor rotor 4. The connecting part 101 is fixedly mounted on the top surface of the motor rotor 4 using rivets.

[0029] The three-section dynamic balancing system uses a balance block whose protruding part 102 protrudes axially from the end face of the connecting part 101. The axial direction can be understood as... Figure 1 In the first direction S1, the projection of the protrusion 102 in the axial direction falls into the projection of the connecting part 101 in the axial direction.

[0030] The protrusion 102 can be understood as a step protruding along the first direction S1. The size of the protrusion 102 is smaller than the size of the connecting part 101 so that the three-section dynamic balancing system can ensure the balance during movement with the balance block. At the same time, the protrusion 102 can throw oil onto the wall of the compressor housing during the rotational movement, so that the oil flows down the wall to the oil pool at the bottom of the compressor, which helps to reduce the oil discharge rate.

[0031] The three-section dynamic balancing system uses the balancing blocks, through the cooperation of the connecting part 101 and the protrusion 102, to improve the original two-section dynamic balancing structure into a three-section structure. This reduces the stress burden on the upper part of the crankshaft 5, making the stress distribution more balanced, and thus making the stress distribution on the shaft system more even, reducing the deflection of the crankshaft during rotation. At the same time, due to the addition of the new balancing structure, part of the weight of the main balancing block 2 can be shared. Therefore, the size and weight of the main balancing block 2 in the original structure can be reduced to meet the high rotation requirements of the existing compressor and reduce the agitation of the airflow at the internal exhaust port during high-speed rotation. Through the protrusion 102 protruding from the connecting part 101, the gas mixture of refrigerant and refrigeration oil can be fully agitated and oil can be thrown off during rotation, which is conducive to oil-gas separation and reduces the oil discharge rate.

[0032] Preferably, such as Figures 1 to 4 As shown in the embodiment, in order to further improve the dynamic balancing efficiency and reduce the deflection of the crankshaft 5 during operation, the three-section dynamic balancing system uses a balance block including at least two protrusions 102. The at least two protrusions 102 protrude sequentially from the end face of the connecting part 101 or the end face of adjacent protrusions 102 along the axial direction (i.e., the first direction S1).

[0033] Preferably, such as Figures 1 to 4 As shown in the embodiment, in order to make the force distribution of the shaft system more even, and at the same time to agitate the gas mixture of refrigerant and refrigeration oil and throw off oil during rotation, which is conducive to oil-gas separation and reduces the oil discharge rate, the projected area of ​​the multiple protrusions 102 in the axial direction (i.e., the first direction S1) decreases sequentially. That is, the size of the multiple protrusions 102 gradually decreases along the first direction S1.

[0034] Preferably, such as Figures 1 to 4 As shown, in this embodiment, the connecting portion 101 includes an inner arc side 103, an outer arc side 104, and two arc transition ends 105 connecting the inner arc side 103 and the outer arc side 104. The arc transition ends 105 are tangent to the inner arc side 103 and the outer arc side 104. From a top viewpoint, the arc of the arc transition end 105 is tangent to the arc of the inner arc side 103 and the arc of the outer arc side 104. The arc radius of the arc transition end 105 is relatively large, so that when rotating at high speed, the refrigerant oil will adhere to the multiple protrusions 102 along the arc surface, preventing the protrusions 102 from splashing oil onto the insulation paper of the motor stator at the same height, thus avoiding damage to the stator insulation paper.

[0035] Preferably, such as Figures 1 to 4 As shown, in the embodiment, the outer arc surface of the protrusion 102 is coplanar with the outer wall of the outer arc side 104 of the connecting part 101, so that the balance block of the three-section dynamic balancing system can rotate more smoothly.

[0036] This three-section dynamic balancing system uses balance blocks, through the cooperation of connecting parts and protrusions, to improve the original two-section dynamic balancing structure into a three-section structure. This reduces the stress burden on the upper part of the crankshaft, making the stress distribution more balanced, and thus making the shaft system more evenly distributed. This reduces the deflection of the crankshaft during operation. At the same time, due to the addition of the new balancing structure, some of the weight of the main balance block can be shared. Therefore, the size and weight of the main balance block in the original structure can be reduced to meet the high rotation requirements of the existing compressor and reduce the agitation of the airflow at the internal exhaust port during high-speed rotation. The protrusions protruding from the connecting parts allow for thorough agitation of the refrigerant and refrigeration oil mixture during rotation, and oil is thrown off, which is beneficial for oil-gas separation and reduces the oil discharge rate.

[0037] like Figures 3 to 6 As shown, according to a second aspect of the present invention, a dynamic balancing assembly is provided, the dynamic balancing assembly including the balancing block for the three-section dynamic balancing system as described above.

[0038] Preferably, in the embodiment, the dynamic balancing assembly may further include a rotor lower balancing block 3. The structure of the rotor lower balancing block 3 may be the same as that of the balancing block used in a three-section dynamic balancing system, that is, it also includes a connecting part 101 and at least two protrusions 102. By providing rotor lower balancing blocks 3 and balancing block bodies 1 with identical structures at the upper and lower ends of the motor rotor 4, the oil discharge rate can be further reduced. During assembly, with Figure 3 For example, the rotor lower balance block 3 and the balance block body 1 are arranged in a centrally symmetrical manner with the radial extension line of the motor rotor 4 as the central axis of symmetry, so as to form a dynamic balance structure. That is, when the rotor lower balance block 3 and the balance block body 1 have the same structure, the protrusion direction of the protrusion 102 of the rotor lower balance block 3 is opposite to the protrusion direction of the protrusion 102 of the balance block body 1.

[0039] Preferably, such as Figures 3 to 6 As shown, in the embodiment, the dynamic balancing assembly may further include a motor rotor 4, a balance block body 1 and a lower balance block 3 respectively disposed at both ends of the motor rotor 4 in the axial direction, and the balance block body 1 and the lower balance block 3 are both fixedly installed on the motor rotor 4 by rivets.

[0040] Preferably, such as Figure 6 As shown, in the embodiment, the dynamic balancing assembly may further include a main balancing block 2 and a crankshaft 5, with the crankshaft 5 passing through the main balancing block 2 and the inner wall of the balancing block body 1 abutting against the crankshaft 5. like Figure 4 and Figure 5 As shown, the main balance block 2 and the balance block body 1 are located on the same side of the crankshaft 5, and the main balance block 2 and the balance block body 1 are installed at the same angle relative to the crankshaft 5. The fact that the main balance block 2 and the balance block body 1 are located on the same side ensures that the centrifugal force during rotation is in the same direction. This allows the balance block body 1 to share some of the weight of the main balance block 2, enabling the main balance block 2 to be designed with a smaller volume and weight. This avoids excessive agitation of the airflow near the exhaust port, which could increase the oil discharge rate. Simultaneously, it makes the shaft system more evenly stressed, reduces the deflection of the crankshaft 5, and increases the reliability of the shaft system.

[0041] This dynamic balancing assembly consists of a three-section dynamic balancing structure, comprising the balancing block body 1, the main balancing block 2, and the rotor lower balancing block 3. It can improve the shaft system reliability of the compressor at high speed and reduce the oil discharge rate, making it suitable for high-speed, high-load compressors.

[0042] Furthermore, according to a third aspect of the present invention, a compressor is provided, the compressor comprising a balance block for a three-stage dynamic balancing system as described above.

[0043] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A balancing block for a three-section dynamic balancing system, used in a dynamic balancing assembly, the dynamic balancing assembly comprising a main balancing block and a rotor lower balancing block, characterized in that, The three-section dynamic balancing system uses a balance block disposed between the main balance block and the lower rotor balance block. The three-section dynamic balancing system uses a balance block comprising: The connecting part is used to mount the balance block of the three-section dynamic balancing system onto the dynamic balancing assembly; The protrusion protrudes from the end face of the connecting part along the axial direction of the balance block of the three-section dynamic balancing system, and the projection of the protrusion in the axial direction falls within the projection of the connecting part in the axial direction.

2. The balance block for the three-section dynamic balancing system according to claim 1, characterized in that, The balance block of the three-section dynamic balancing system includes at least two protrusions, and at least two of the protrusions protrude sequentially from the end face of the connecting part or the end face of adjacent protrusions along the axial direction.

3. The balance block for the three-section dynamic balancing system according to claim 2, characterized in that, The projected area of ​​the plurality of protrusions in the axial direction decreases sequentially.

4. The balance block for the three-section dynamic balancing system according to claim 1, characterized in that, The connecting portion includes an inner arc side, an outer arc side, and an arc transition end connecting the inner arc side and the outer arc side, the arc transition end being tangent to the inner arc side and the outer arc side.

5. The balance block for the three-section dynamic balancing system according to claim 4, characterized in that, The outer arc surface of the protrusion is coplanar with the outer wall of the outer arc side of the connecting part.

6. A dynamic balancing component, characterized in that, The dynamic balancing assembly includes the balance block for the three-section dynamic balancing system as described in any one of claims 1 to 5.

7. The dynamic balancing assembly according to claim 6, characterized in that, The dynamic balancing assembly also includes a rotor lower balancing block, the structure of which is the same as that of the balancing block used in the three-section dynamic balancing system.

8. The dynamic balancing assembly according to claim 7, characterized in that, The dynamic balancing assembly also includes a motor rotor and a main balancing block. The three-section dynamic balancing system balancing block and the rotor lower balancing block are respectively disposed at both ends of the motor rotor in the axial direction. The three-section dynamic balancing system uses the protruding part of the balancing block to extend toward the main balancing block.

9. The dynamic balancing assembly according to claim 8, characterized in that, The dynamic balancing assembly also includes a crankshaft through which the main balance block passes, and the three-section dynamic balancing system uses the inner wall of the balance block to abut against the crankshaft; The main balance block and the balance block of the three-section dynamic balancing system are located on the same side of the crankshaft, and the main balance block and the balance block of the three-section dynamic balancing system have the same installation angle relative to the crankshaft.

10. A compressor, characterized in that, The compressor includes the dynamic balancing assembly as described in any one of claims 6 to 9.

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