Balancing weight block and scroll compressor

Abstract

The invention discloses a balance weight block and a scroll compressor, and relates to the technical field of scroll compressors, in particular to the balance weight block and the scroll compressor. According to the balance weight block and the scroll compressor, the auxiliary oil supply channel is arranged in the balance weight block; and the auxiliary oil supply channel is formed by a balance weight block annular channel and an upward channel on the balance weight block and a transverse channel, an eccentric channel and an annular channel on the driving shaft component or a combination of several of the components. According to the technical scheme, the problems that in the prior art, in the operation process of the scroll compressor, especially under the condition of low-speed operation, enough stirring force cannot be provided for the lubricating agent, so that the thrust surface between the movable scroll component and the main bearing seat is lubricated insufficiently, and consequently excessive abrasion, even kinematic pair failure and the like are caused are solved.

Description

Technical Field

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

[0002] The scroll compressor belongs to the variable volume compression machinery. The scroll compressor includes a fixed scroll component provided with involute blades and a movable scroll component provided with involute blades matched with the fixed scroll component. The blades of the fixed scroll component and the movable scroll component mesh with each other to form a plurality of cavities with variable volumes, thereby compressing the working fluid (for example, refrigerant or other gases, etc.). Usually, after the working fluid is introduced into the variable cavity from the air intake port, the eccentric component driven by the motor or other power input drives the movable scroll component to rotate relative to the fixed scroll component to achieve compression of the working fluid. During the operation of the scroll compressor, the centrifugal force or centrifugal torque generated by the rotation of the eccentric component will cause vibration and noise of the compressor. Usually, a balancing weight is set at the upper end of the driving shaft of the rotating component to provide reverse centrifugal force or centrifugal torque to balance the imbalance generated by the eccentric component. In addition, during operation, the movable scroll component is supported by the main bearing seat and the thrust plate to provide axial constraint. Since the movable scroll component rotates linearly relative to the thrust plate of the main bearing seat, it is necessary to provide sufficient lubrication for the thrust surface between it and the movable scroll component, so as to reduce additional power loss and avoid failure of the moving structure due to poor lubrication.

[0003] Taking the vertical scroll compressor as an example, the existing structure basically stores lubricating oil at the bottom of the internal cavity of the compressor. When the compressor is working, the lubricating oil flows upward through the internal channel of the drive shaft under the pressure provided by the centrifugal force or the oil pump, and flows through the eccentric hole on the upper end face of the drive shaft to achieve lubrication of the movable scroll bearing and the drive shaft; at the same time, the lubrication between the main bearing and the drive shaft is achieved through the transverse channel set in the main bearing part of the drive shaft; the two parts of lubricating oil are collected in the cavity between the main bearing seat and the movable scroll, and the lubricating oil collected in the cavity is splashed onto the lower surface of the movable scroll end plate due to the high-speed rotation of the balance weight, thereby lubricating the thrust surface between the main bearing seat and the movable scroll component as the movable scroll component rotates in translation. Since this area is basically large at the bottom and narrowed at the top and has a large space, the amount of effective lubricating oil entering the thrust surface when lubrication is performed only by the stirring splash of the balancing weight is often small and unstable. Especially when the compressor rotates at a low speed, it is unable to provide sufficient stirring force for the lubricant, resulting in insufficient lubrication of the thrust surface between the movable scroll component and the main bearing seat, causing excessive wear and even failure of the kinematic pair.

[0004] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of balancing weight and scroll compressor to overcome the problems existing in the prior art. Summary of the invention

[0005] According to the technical problem proposed in the above-mentioned prior art that when the compressor rotates at a low speed, it is impossible to provide sufficient stirring force to the lubricant, resulting in insufficient lubrication of the thrust surface between the movable scroll component and the main bearing seat, causing excessive wear and even failure of the kinematic pair, a balancing weight block and a scroll compressor are provided.

[0006] The technical means adopted by the present invention are as follows:

[0007] A balancing weight and a scroll compressor, wherein the scroll compressor comprises: a fixed scroll component, a movable scroll component, a balancing weight, a drive shaft component, a main bearing seat and a main bearing seat thrust base plate; the drive shaft component is assembled in the main bearing seat, and the main bearing seat provides radial constraints; the movable scroll component is assembled on the eccentric part of the drive shaft component, and the main bearing seat thrust base plate (1510) provides axial constraints; the movable scroll component and the fixed scroll component are assembled in relative cooperation; the main bearing seat thrust base plate is arranged on the upper part of the main bearing seat, and its top end contacts the thrust surface of the movable scroll base plate of the movable scroll component; the fixed scroll component, the main bearing seat thrust base plate and the main bearing seat are fixedly connected by bolts or other means; the balancing weight is mounted on the drive shaft component, and at least a part or all of it is arranged in the main bearing cavity between the movable scroll disk base plate of the movable scroll component and the main bearing seat, and the balancing weight is tightly matched with the drive shaft component and rotates with the drive shaft component;

[0008] Furthermore, an oil supply channel is also provided inside the balancing weight block and the balancing weight block (1300) of the scroll compressor;

[0009] Further, the oil supply channel is formed by the balancing weight annular channel and the upward channel on the balancing weight and the transverse channel, the eccentric channel and the annular channel on the driving shaft component together or by a combination of several of them.

[0010] Furthermore, the main body of the balancing weight is an annular structure in which the eccentric mass portion and the balancing weight mounting portion are integrally processed;

[0011] Furthermore, a groove-type annular channel for the balancing weight is provided on the inner side wall of the balancing weight installation portion, and the balancing weight is closely matched with the driving shaft component to form a closed annular channel;

[0012] Furthermore, a balancing weight block protrusion is provided on the eccentric mass portion;

[0013] Furthermore, an upward channel is provided on the raised portion of the balancing weight;

[0014] Furthermore, the bottom end of the upward channel is communicated with the annular channel of the balancing weight, and the top is opened at the gap between the top end of the convex portion of the balancing weight and the movable scroll component.

[0015] Furthermore, the annular channel of the balancing weight is arranged eccentrically / concentrically;

[0016] Furthermore, when the annular channel of the balancing weight is eccentrically arranged, its center is offset from the rotation center of the balancing weight by a distance e.

[0017] Furthermore, the eccentric mass portion and the convex portion of the balancing weight block adopt one of an integrated structure and a split structure.

[0018] Furthermore, the upward channel of the protruding portion of the balancing weight is arranged inclined.

[0019] Furthermore, a transverse channel is provided at a position corresponding to the drive shaft component and the balancing weight installation portion;

[0020] Furthermore, one end of the transverse channel is communicated with an eccentric channel in the middle of the drive shaft component as a main oil supply channel, and the other end corresponds to the annular channel of the balance weight block.

[0021] Furthermore, an annular channel is provided at the portion where the drive shaft component cooperates with the balancing weight installation portion;

[0022] Further, the annular channel of the drive shaft component is communicated with the transverse channel.

[0023] It should be noted that since the power of the active oil supply method in this invention comes from the centrifugal pressure generated by the rotating fluid, the relationship between the rotating speed, the rotating radius and the maximum height that the fluid can be lifted vertically can be calculated. Fig. 9 As shown, p1 is the pressure generated at point p due to the rotation of the liquid; p2 is the pressure generated at point p due to the vertical height difference (only the centrifugal pressure generated by the rotation of the liquid is considered). Then we can get:

[0024]

[0025] p2=ρgh

[0026] in:

[0027] ρ is the density of the fluid (kg / m 3 )

[0028] ω is the angular velocity of the fluid rotation (rad / s)

[0029] r is the radius of rotation of the fluid here (m)

[0030] g is the acceleration due to gravity (m / s 2 )

[0031] h is the height of the fluid (m)

[0032] The centrifugal pressure generated by rotation can effectively lift the limit condition of liquid is p1=p1 (not considering the pressure loss of other liquid flows). So the relationship between ω, r, and h can be obtained as:

[0033]

[0034] According to r = 30mm; ω = 94.2rad / s (15Hz), h = 400mm. The h dimension in the attached figure is much smaller than 400mm. Therefore, the centrifugal pressure generated by the rotation of the lubricating oil can effectively supply oil to the friction surface at a high position even at a low speed (20Hz).

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. The balancing weight and scroll compressor provided by the present invention utilize the centrifugal pressure generated by the rotating component to actively supply lubricant to the thrust surface between the movable scroll component and the main bearing seat.

[0037] 2. The balancing weight and scroll compressor provided by the present invention provide a method for actively supplying lubricant to the thrust surface between the movable scroll component and the main bearing seat without changing the main structure of the existing scroll compressor.

[0038] In summary, the technical solution of the present invention solves the problem in the prior art that during the operation of the scroll compressor, especially under low-speed rotation, the lubricant cannot be provided with sufficient stirring force, resulting in insufficient lubrication of the thrust surface between the movable scroll component and the main bearing seat, causing excessive wear and even failure of the kinematic pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 It is a schematic diagram of the structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the balancing weight block of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of the balancing weight block annular channel adopting an eccentric structure of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the eccentric mass part and the convex part of the balance weight block of the present invention adopting a split structure;

[0044] Figure 5 This is a schematic diagram of the structure of the upward channel of the present invention adopting an inclined design;

[0045] Figure 6 The eccentric mass part of the present invention is a schematic structural diagram of the raised part of the balance weight block;

[0046] Figure 7 This is a schematic diagram of the structure of the drive shaft component of the present invention without an annular channel;

[0047] Figure 8 A schematic diagram of the structure of the drive shaft component of the present invention with an annular channel;

[0048] Fig. 9 Figure 1 is a formula of the present invention;

[0049] Fig.10 It is a partial longitudinal cross-sectional view of a conventional vertical scroll compressor;

[0050] Fig.11 It is a top view of the main bearing support seat of an existing scroll compressor;

[0051] Fig.12 The figure is a schematic diagram of the structure of a balancing weight block of an existing scroll compressor.

[0052] In the figure: 1000, scroll compressor 1100, fixed scroll component 1200, movable scroll component 1210, movable scroll thrust plate 1211, movable scroll substrate thrust surface 1300, balancing weight block 1310, balancing weight block protrusion 1320, balancing weight block annular channel 1330, upward channel 1340, balancing weight block mounting portion 1350, eccentric mass portion 1400, drive shaft component 1410, transverse channel 1420, eccentric channel 1430, eccentric portion 1440, annular channel 1500, main bearing seat 1510, thrust substrate 1511, active bearing seat substrate thrust surface 1520, cavity DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] Example 1

[0061] like Figure 1 As shown, the present invention provides a balancing weight and a scroll compressor, including a fixed scroll component 1100 provided with an involute blade, and a movable scroll component 1200 provided with an involute blade matched with the fixed scroll component. The eccentric portion 1430 of the drive shaft component 1400 driven by the motor or other power input drives the movable scroll component 1200 to perform translational rotation relative to the fixed scroll component 1100 to achieve compression of the working fluid (the movable scroll 1200 will not rotate around its own axis during operation). The drive shaft 1400 is provided with radial constraints by the main bearing seat 1500. During operation, the movable scroll component 1200 is supported by the main bearing seat 1500 and the thrust base plate 1510 to provide axial constraints. The main bearing seat 1500 and the thrust base plate 1510 can be separate components or integrated components. Since the movable scroll component 1200 rotates linearly relative to the main bearing seat thrust plate 1510, strong sliding friction is generated between the movable scroll plate thrust surface 1211 and the active bearing seat plate thrust surface 1511. Therefore, sufficient lubrication must be provided between the movable scroll plate thrust surface 1211 and the active bearing seat plate thrust surface 1511 to reduce additional power loss and avoid failure of the kinematic pair function due to poor lubrication.

[0062] During the operation of the scroll compressor, the centrifugal force or centrifugal moment generated by the rotation of the eccentric component can cause vibration and noise of the compressor. A balancing weight 1300 is arranged at the upper end of the rotating component drive shaft 1400 to provide reverse centrifugal force or centrifugal moment to balance the unbalanced amount generated by the eccentric component.

[0063] like Figure 2 As shown, the balancing weight 1300 is composed of an eccentric mass portion 1350 that is approximately semicircular in shape and a mounting portion 1350 that is annular in shape.

[0064] like Figure 1 As shown, the balancing weight 1300 is mounted on the eccentric drive shaft 1400 and is located in the cavity 1520 between the main bearing seat 1500 and the movable scroll thrust plate 1210 .

[0065] like Figure 1 As shown, when the scroll compressor is working, the lubricating oil located at the bottom of the scroll compressor 1000 flows upward through the eccentric channel 1420 inside the drive shaft 1400 under the pressure provided by the centrifugal force or the oil pump, and flows through the eccentric hole on the upper end face of the drive shaft 1400 to achieve lubrication between the movable scroll bearing and the eccentric part of the drive shaft; at the same time, part of the lubricating oil through the eccentric channel 1420 of the drive shaft 1400 provides lubricating oil to the annular channel 1320 of the balancing weight block through the transverse channel 1410 of the drive shaft under the action of the oil pump pressure or the centrifugal pressure; further, under the action of the centrifugal pressure, the lubricating oil located in the annular channel 1320 of the balancing weight block supplies oil to the upward channel 1330 located inside the raised portion 1310 of the balancing weight block and communicates with the annular channel 1320 of the balancing weight block under the action of the centrifugal pressure and is thrown out at its end. The upward channel 1330 connected to the annular channel 1320 of the balancing weight directly opens at a suitable height between the thrust surface 1211 of the movable scroll substrate and the thrust surface 1511 of the active bearing seat substrate. As the movable scroll component 1200 rotates linearly, the lubricating oil thrown out from the end of the upward channel 1330 of the balancing weight 1300 enters between the thrust surface 1211 of the movable scroll substrate and the thrust surface 1511 of the active bearing seat substrate, thereby completing active lubrication thereof.

[0066] Example 2

[0067] like Figure 3 As shown, (based on Example 1), the present invention further provides a balancing weight and a scroll compressor, wherein the annular channel 1320 is eccentrically arranged, wherein the center of the annular channel 1320 is offset from the rotation center of the balancing weight 1300 by a distance e when the annular channel 1320 is eccentrically arranged. The advantage of this solution is that the offset distance e increases the rotation radius of the lubricating oil, thereby increasing the centrifugal force of this part of the lubricating oil during the rotation process, thereby increasing the upward oil supply pressure of the lubricating oil, and can improve the effect of the upward delivery of the lubricating oil.

[0068] Example 3

[0069] like Figure 4 As shown, (based on Example 1), the present invention further provides a balancing weight and a scroll compressor, wherein the balancing weight protrusion 1310 and its internal upward channel 1330 are designed separately from the balancing weight 1300 body, and the two can be connected by interference fit, thread, etc. The advantage of this split method is that it provides an optional and flexible installation solution, and the present invention can be applied without making major changes to the existing solution.

[0070] Example 4

[0071] like Figure 5 As shown, (based on Example 1,) the present invention also provides a balancing weight and a scroll compressor, wherein the internal upward channel 1330 of the protrusion 1310 of the balancing weight 1300 is arranged obliquely. In this application, the inclination angle and direction of the upward channel 1330 are arranged in combination with the rotation direction of the scroll compressor, which can improve the effect of the upward circulation of the lubricating oil.

[0072] Example 5

[0073] like Figure 6 As shown, (based on Example 1), the present invention also provides a balancing weight and a scroll compressor, and a design scheme in which the eccentric mass 1350 of the balancing weight 1300 is integrated. In the application of this scheme, if space permits, the eccentric mass 1350 of the balancing weight 1300 is integrated with its protrusion 1310, that is, the eccentric mass 1350 is the protrusion 1310 itself.

[0074] Example 6

[0075] like Figure 7 As shown, (based on Example 1,) the present invention also provides a balancing weight and a scroll compressor, wherein an annular channel (1440) is provided at the portion where the drive shaft component (1400) cooperates with the balancing weight mounting portion (1340); the annular channel (1440) is communicated with the transverse channel (1420).

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balancing weight and a scroll compressor, wherein the scroll compressor (1000) comprises: A fixed scroll component (1100), a movable scroll component (1200), a balancing weight (1300), a drive shaft component (1400), a main bearing seat (1500) and a main bearing seat thrust base plate (1510); the drive shaft component (1400) is assembled in the main bearing seat (1500), and the main bearing seat (1500) provides radial constraints; the movable scroll component (1200) is assembled on the eccentric portion (1430) of the drive shaft component (1400), and the main bearing seat thrust base plate (1510) provides axial constraints; the movable scroll component (1200) and the fixed scroll component (1100) are assembled in relative cooperation; the main bearing seat thrust base plate (1510) is arranged on the main The upper part of the bearing seat (1500) has a top end in contact with the thrust surface (1211) of the movable scroll base plate of the movable scroll component (1200); the fixed scroll component (1100), the main bearing seat thrust base plate (1510) and the main bearing seat (1500) are fixedly connected by bolts or other means; the balancing weight (1300) is installed on the drive shaft component (1400), and at least a part or all of it is arranged in the main bearing cavity (1520) between the movable scroll plate (1210) of the movable scroll component and the main bearing seat (1500); the balancing weight (1300) is tightly matched with the drive shaft component (1400) and rotates with the drive shaft component (1400); it is characterized in that: The balancing weight block and the balancing weight block (1300) of the scroll compressor are also provided with an oil supply channel inside; The oil supply channel is formed by the balancing weight annular channel (1320) and the upward channel (1330) on the balancing weight (1300) and the transverse channel (1410), the eccentric channel (1420) and the annular channel (1440) on the driving shaft component (1400) together or by a combination of several of them.

2. The balancing weight and scroll compressor according to claim 1, characterized in that: The main body of the balancing weight (1300) is a ring-shaped structure in which the eccentric mass portion (1350) and the balancing weight installation portion (1340) are integrally processed; A groove-type balancing weight annular channel (1320) is provided on the inner side wall of the balancing weight installation portion (1340), and the balancing weight (1300) is tightly matched with the driving shaft component (1400); The eccentric mass portion (1350) is provided with a balancing weight block protrusion (1310); The balancing weight protrusion (1310) is provided with an upward channel (1330); The bottom end of the upward channel (1330) is communicated with the annular channel (1320) of the balancing weight, and the top is opened at the gap between the top end of the balancing weight protrusion (1310) and the movable scroll component (1200).

3. The balancing weight and scroll compressor according to claim 2, characterized in that: The balancing weight annular channel (1320) is arranged eccentrically or concentrically; When the balancing weight annular channel (1320) is eccentrically arranged, its center is offset from the rotation center of the balancing weight (1300) by a distance e.

4. The balancing weight and scroll compressor according to claim 2, characterized in that: The eccentric mass portion (1350) and the balancing weight block protrusion (1310) adopt one of an integrated structure and a split structure.

5. The balancing weight and scroll compressor according to claim 2, characterized in that: The upward channel (1330) of the balancing weight protrusion (1310) is arranged in an inclined manner.

6. The balancing weight and scroll compressor according to claim 1, characterized in that: The driving shaft component (1400) is provided with a transverse channel (1410) at a position corresponding to the balancing weight installation portion; One end of the transverse channel (1410) is communicated with the eccentric channel (1420) in the middle of the drive shaft component (1400) serving as the main oil supply, and the other end corresponds to the annular channel (1320) of the balancing weight block.

7. The balancing weight and scroll compressor according to claim 1, characterized in that: An annular channel (1440) is provided at the portion where the driving shaft component (1400) cooperates with the balancing weight block mounting portion (1340); The annular channel (1440) is communicated with the transverse channel (1420).

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