Scroll compressor shaft balance structure, scroll compressor, air conditioner

Abstract

The present invention provides a scroll compressor shaft system balancing structure, a scroll compressor, and an air conditioner, wherein the scroll compressor shaft system balancing structure includes a crankshaft, a movable scroll plate, and an upper bracket, wherein the movable scroll plate has a movable plate bearing seat, and the crankshaft eccentric portion of the crankshaft can be rotatably inserted in the movable plate bearing seat, and the upper bracket is configured with a sleeve matching hole, and also includes a balancing sleeve, the balancing sleeve has an inner hole and an outer circle, wherein the movable plate bearing seat can be rotatably inserted in the inner hole, and the balancing sleeve can be rotatably inserted in the sleeve matching hole, and the center of the outer circle coincides with the rotation center of the crankshaft and the center of the inner hole does not coincide with the center of the outer circle. According to the present invention, the mass of the required balancing block can be selected to be smaller, which reduces the deformation of the crankshaft and reduces the vibration and noise of the compressor; in addition, it can effectively reduce the probability of overturning of the movable scroll plate, improve the running stability of the pump body, and improve the efficiency of the compressor.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor manufacturing, and in particular relates to a scroll compressor shaft system balancing structure, a scroll compressor, and an air conditioner. Background Art

[0002] The scroll compressor consists of a sealed shell, a fixed scroll, a movable scroll, a bracket, an eccentric crankshaft, an anti-rotation mechanism and a motor. The profiles of the movable and fixed scrolls are both spiral. The movable scroll is eccentric to the fixed scroll and installed 180° apart, so multiple crescent-shaped spaces are formed between the movable and fixed scrolls. The movable scroll rotates with the center of the fixed scroll as the center and rotates at a certain rotation eccentric radius without self-rotation. The outer crescent-shaped space moves continuously toward the center. At this time, the refrigerant is gradually pushed toward the center space, and its volume continues to shrink while the pressure continues to increase until it is connected to the central exhaust hole. The high-pressure refrigerant is discharged from the pump body, completing the compression process.

[0003] The scroll compressor is a positive displacement compressor with eccentric motion. During the rotation process, centrifugal force will be generated, resulting in vibration and noise. Therefore, dynamic balancing design is required for the entire rotating system. The existing conventional technology is to set a counterweight / balance block on the shaft system to offset the centrifugal force of the moving plate and achieve smooth operation of the compressor. A counterweight / balance block with a larger mass is required to balance the centrifugal force of the moving plate. Summary of the invention

[0004] Therefore, the present invention provides a scroll compressor shaft system balancing structure, a scroll compressor, and an air conditioner, which can overcome the deficiency of the related art that a larger counterweight block is needed to balance the centrifugal force of the movable scroll.

[0005] In order to solve the above problems, the present invention provides a scroll compressor shaft system balancing structure, including a crankshaft, a movable scroll plate, and an upper bracket, the movable scroll plate having a movable plate bearing seat, the crankshaft eccentric portion having a crankshaft can be rotatably inserted in the movable plate bearing seat, the upper bracket is configured with a sleeve matching hole, and also includes a balancing sleeve, the balancing sleeve has an inner hole and an outer circle, wherein the movable plate bearing seat can be rotatably inserted in the inner hole, the balancing sleeve can be rotatably inserted in the sleeve matching hole, the center of the outer circle coincides with the rotation center of the crankshaft, and the center of the inner hole does not coincide with the center of the outer circle.

[0006] In some embodiments, the straight shaft section of the crankshaft is rotatably supported on the upper bracket via a first sliding bearing.

[0007] In some embodiments, a motor rotor is mounted on the straight shaft section of the crankshaft, a first balancing block is connected to one shaft end of the motor rotor and / or a second balancing block is connected to the other shaft end of the motor rotor.

[0008] In some embodiments, a third balancing block is mounted on the straight shaft section of the crankshaft.

[0009] In some embodiments, the third balancing block is disposed on a straight shaft section between the upper bracket and the motor rotor.

[0010] In some embodiments, the third balancing weight includes a sleeve sleeved with the straight shaft section, and the third balancing weight is connected to the straight shaft section through the sleeve sleeve.

[0011] In some embodiments, the crankshaft has a lubricating oil passage extending axially therethrough, and the lubricating oil passage has an oil outlet located at a first axial end of the crankshaft, wherein the first axial end is the axial end of the crankshaft located in the movable plate bearing seat.

[0012] The present invention also provides a scroll compressor, comprising the above scroll compressor shaft system balancing structure.

[0013] The present invention also provides an air conditioner, comprising the scroll compressor.

[0014] The present invention provides a scroll compressor shaft system balancing structure, scroll compressor, and air conditioner, wherein the inner hole cooperates with the outer circumferential wall of the movable plate bearing seat, and the outer circle cooperates with the upper bracket through the sleeve matching hole, and the crankshaft rotates to drive the movable scroll plate to revolve and translate through the crankshaft eccentric part, and the movable scroll plate drives the balancing sleeve to rotate. Since the rotation center of the balancing sleeve coincides with the rotation center of the crankshaft, the balancing sleeve is sleeved on the movable plate bearing seat and combined with the crankshaft eccentric part to form a non-eccentric cylinder, so that the unbalanced mass on the shaft system is only the base plate of the movable scroll plate and the scroll teeth on the base plate, and the unbalanced motion mass that needs to be balanced is reduced, so that the rotation of the shaft system is more stable, the mass of the balancing block required can be selected to be smaller, and the deformation of the crankshaft, the vibration and noise of the compressor are reduced; in addition, the balancing sleeve sleeved outside the movable plate bearing seat can also achieve the effect of supporting the movable scroll plate, which can effectively reduce the overturning of the movable scroll plate, improve the running stability of the pump body, and improve the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A longitudinal sectional view of the structure of a scroll compressor according to an embodiment of the present invention;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of a balancing sleeve in a scroll compressor shaft balancing structure according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 A top view of

[0018] Figure 4 for Figure 3 Schematic diagram of the cross section of AA;

[0019] Figure 5 It is a schematic diagram of the assembly of the scroll compressor shaft system balancing structure of the present invention;

[0020] Figure 6 for Figure 1 Schematic diagram of the internal structure of the upper bracket;

[0021] Figure 7 for Figure 1 Schematic cross-section of the middle BB;

[0022] Figure 8 It is a structural schematic diagram corresponding to Embodiment 1 of the present invention;

[0023] Fig. 9 It is a structural schematic diagram corresponding to Embodiment 2 of the present invention;

[0024] Fig.10 It is a structural schematic diagram corresponding to Embodiment 3 of the present invention;

[0025] Fig.11 It is a structural schematic diagram corresponding to Embodiment 4 of the present invention;

[0026] Fig.12 It is a structural schematic diagram corresponding to Example 5 of the present invention.

[0027] The reference numerals are:

[0028] 1. Scroll compressor; 2. Compression mechanism; 3. Driving part; 4. Motor; 5. Stationary scroll; 6. Moving scroll; 6a. Moving disk bearing seat; 7. Cross slip ring; 8. Upper bracket; 8a. Sleeve matching hole; 8b. Inner hole of main bearing of upper bracket; 9. Upper cover; 10. Shell; 11. Balance sleeve; 11a. Inner hole; 11b. Outer circle; 12. Moving disk sliding bearing; 13. Crankshaft; 13a. Eccentric part of crankshaft; 14. Thrust plate; 15. First sliding bearing; 16. Third balancing block; 17. Motor rotor; 18. Motor stator; 19. First balancing block; 19a. Second balancing block; 20. Auxiliary bearing cover plate; 21. Lower bracket; 22. Second bearing; 23. Oil return pipe; 24. Oil supply mechanism; 25. Lower cover; 26. Oil storage tank. DETAILED DESCRIPTION

[0029] See also Figures 1 to 12As shown, according to an embodiment of the present invention, a scroll compressor shaft system balancing structure is provided, comprising a crankshaft 13, a movable scroll plate 6, and an upper bracket 8, wherein the movable scroll plate 6 has a movable plate bearing seat 6a, and the crankshaft eccentric portion 13a of the crankshaft 13 is rotatably inserted in the movable plate bearing seat 6a, and the upper bracket 8 is configured with a sleeve matching hole 8a, and further comprises a balancing sleeve 11, wherein the balancing sleeve 11 has an inner hole 11a and an outer circle 11b, wherein the movable plate bearing seat 6a is rotatably inserted in the inner hole 11a, and the balancing sleeve 11 is rotatably inserted in the sleeve matching hole 8a, the center of the outer circle 11b coincides with the rotation center of the crankshaft 13, and the center of the inner hole 11a does not coincide with the center of the outer circle 11b (the theoretical values ​​of the eccentricity of the two are equal, and there are tolerance requirements in actual engineering), that is, the inner hole 11a and the outer circle 11b are designed to be eccentric. In this technical solution, the inner hole 11a cooperates with the outer circumferential wall of the movable plate bearing seat 6a, and the outer circle 11b cooperates with the upper bracket 8 through the sleeve matching hole 8a. The crankshaft 13 rotates to drive the movable scroll plate 6 to revolve and translate through the crankshaft eccentric portion 13a, and the movable scroll plate 6 drives the balancing sleeve 11 to rotate. Since the rotation center of the balancing sleeve 11 coincides with the rotation center of the crankshaft 13, the balancing sleeve 11 is sleeved on the movable plate bearing seat 6a and combined with the crankshaft eccentric portion 13a to form a combination. A non-eccentric cylinder, so that the unbalanced mass on the shaft system is only the base plate of the movable scroll plate 6 and the scroll teeth on the base plate, and the unbalanced motion mass that needs to be balanced is reduced, so that the rotation of the shaft system is more stable, and the mass of the balancing block required can be selected to be smaller, thereby reducing the deformation of the crankshaft 13, the vibration and noise of the compressor; in addition, the balancing sleeve 11 sleeved outside the movable plate bearing seat 6a can also achieve the effect of supporting the movable scroll plate 6, which can effectively reduce the overturning of the movable scroll plate 6, improve the operating stability of the pump body, and improve the efficiency of the compressor.

[0030] In some embodiments, the straight shaft section of the crankshaft 13 is rotatably supported on the upper bracket 8 via a first sliding bearing 15 , which can ensure the position reliability of the crankshaft 13 while reducing the operating wear between the crankshaft 13 and the upper bracket 8 .

[0031] The straight shaft section of the crankshaft 13 is mounted with a motor rotor 17. On the basis of the above-mentioned technical solution, further, a first balancing block 19 is connected to one axial end of the motor rotor 17 and / or a first balancing block 19a is connected to the other axial end of the motor rotor 17, so that the shaft system can be further accurately balanced. It can be understood that at this time, the mass of the first balancing block 19 and the first balancing block 19a can be selected to be smaller, and the space occupied can be smaller. The specific setting position can be determined according to the specific dynamic balancing test, which will not be repeated in the present invention.

[0032] As another feasible implementation, a third balancing block 16 is mounted on the straight shaft section of the crankshaft 13. The third balancing block 16 can be set separately, that is, not set together with the first balancing block 19 and the first balancing block 19a. Of course, it can also be set together with one or both of the first balancing block 19 and the first balancing block 19a to achieve dynamic balancing of multiple points in the axial direction of the crankshaft 13, so as to achieve a better balancing effect. In a specific implementation, the third balancing block 16 is set on the straight shaft section between the upper bracket 8 and the motor rotor 17.

[0033] In some embodiments, the third balancing weight 16 includes a sleeve sleeved with the straight shaft section, and the third balancing weight 16 is connected to the straight shaft section via the sleeve sleeve (eg, interference fit), so that the setting angle of the third balancing weight 16 can be precisely adjusted.

[0034] In some embodiments, the crankshaft 13 has a lubricating oil passage extending axially thereof, and the lubricating oil passage has an oil outlet at a first axial end of the crankshaft 13, wherein the first axial end is the axial end of the crankshaft 13 located in the movable plate bearing seat 6a. In this way, the lubricating oil pumped up in the lubricating oil passage can enter the fitting between the balancing sleeve 11 and the movable plate bearing seat 6a and the fitting between the balancing sleeve 11 and the sleeve fitting hole 8a through the movable plate bearing seat 6a, thereby achieving sufficient lubrication of the rotating pair and effectively reducing wear and heat accumulation.

[0035] The present invention also provides a scroll compressor, comprising the above scroll compressor shaft system balancing structure.

[0036] The following combination Figures 1 to 10 The technical solution of the present invention is further explained.

[0037] Embodiment 1:

[0038] like Figure 1As shown, the scroll compressor 1 contains a compression mechanism 2 and a driving part 3 in a sealed container, and the sealed container is composed of an upper cover 9, a shell 10 and a lower cover 25. The compression mechanism 2 is composed of a fixed scroll 5, a movable scroll 6, and a cross slip ring 7. The driving part 3 is mainly composed of a motor 4 and a crankshaft 13. During the operation of the scroll compressor, the movable scroll 6 is driven by the driving part 3 to rotate, and meshes with the fixed scroll 5 to form a crescent-shaped compression chamber. As the crankshaft 13 rotates, the refrigerant enters the compression mechanism 2, and the movable scroll 6 continues to rotate and translate and always maintains a good meshing state. The suction cavity continuously moves toward the center, the volume continuously decreases, and the pressure in the cavity continuously increases. When the compression reaches a predetermined compression ratio, the refrigerant is discharged from the central exhaust port of the fixed scroll 5, enters the space of the upper cover of the sealed container, enters the space of the motor 4 through the exhaust channel of the fixed scroll 5 and the upper bracket 8, cools the motor 4, and then is discharged from the scroll compressor 1 and enters the air conditioning system to complete the refrigeration / heating cycle.

[0039] like Figure 2 The structure of the balancing sleeve 11 of the present invention is shown in FIG. 1 , and its core feature is that the inner hole 11 a and the outer circle 11 b of the balancing sleeve 11 are designed as eccentric structures, that is, the center of the inner hole 11 a is not concentric with the outer circle 11 b.

[0040] like Figure 3 As shown, the shaft system of the present invention as a whole includes a movable scroll 6, a balancing sleeve 11, a third balancing block 16, and a motor rotor 17 mounted on the crankshaft 13, and a first balancing block 19 mounted on the motor rotor 17. Figure 4 and Figure 5 As shown, the inner hole 11a cooperates with the movable scroll 6, and the outer circle 11b cooperates with the sleeve matching hole 8a of the upper bracket 8. The rotation of the motor 4 drives the crankshaft 13 to rotate, and the eccentric part 13a of the crankshaft drives the movable scroll 6 to revolve and translate. Then the movable scroll 6 drives the balancing sleeve 11 to rotate, and the core feature is that the rotation center of the balancing sleeve 11 is the same as the rotation center of the crankshaft 13, and is also concentric with the inner hole 8b of the main bearing of the upper bracket.

[0041] For example Figure 6 As shown, a typical arrangement of the balancing structure on the shaft system of the present invention is given. The rotation center axis of the crankshaft 13 and the eccentric portion 13a of the crankshaft are used to distinguish the same-side and opposite-side positional relationships of the components in the view. Among them, the movable scroll 6, the inner hole 11a of the balancing sleeve 11 and the eccentric portion 13a of the crankshaft are on the same side, and the third balancing block 16 is on the opposite side of the eccentric portion 13a of the crankshaft and is fixed on the crankshaft 13. The first balancing block 19 is fixed to the lower end of the motor rotor 17 and is on the same side as the crankshaft eccentric 13a. After the eccentric mechanism is arranged in this way, the centrifugal force and moment of each eccentric component are calculated to meet the balance of the resultant force and the resultant moment, and finally the specific dimensions of the structure are designed to achieve the effect of dynamic balancing.

[0042] The structure of the invention provides an effective shaft balancing structure for high-speed scroll compressors to achieve shaft dynamic balancing. Compared with conventional balancing designs, it can effectively reduce the mass of each balancing mechanism, reduce centrifugal force, reduce crankshaft deformation, improve the reliability of sliding bearings, and reduce compressor vibration and noise. In addition, the structure increases the support position of the movable scroll disk, which can restrict the overturning tendency of the movable scroll disk, enhance the operating stability of the pump body, improve the sealing effect of the movable and static scroll disks, avoid pump body leakage, and improve the efficiency of the compressor.

[0043] The above is a typical embodiment of the present invention, which briefly expresses the core idea of ​​the invention. Through the shaft balancing structure of the present invention, the dynamic balancing design effect of the scroll compressor when running at high speed is achieved, the crankshaft deformation caused by the high-speed rotation of the compressor is prevented, the vibration of the whole machine is reduced, and the reliability and noise performance of the compressor are improved.

[0044] Embodiment 2:

[0045] like Figure 7 As shown, a second embodiment of the present invention is given.

[0046] The rotation center axis of the crankshaft 13 and the crankshaft eccentric part 13a are used to distinguish the same side and opposite side position relationship of each component in the view. Among them, the movable scroll plate 6, the inner hole 11a of the balancing sleeve 11 and the crankshaft eccentric part 13a are on the same side, and the third balancing block 16 is on the opposite side of the crankshaft eccentric part 13a and fixed to the upper end of the motor rotor 17. The first balancing block 19 is fixed to the lower end of the motor rotor 17 and is on the same side as the crankshaft eccentric 13a. After arranging the eccentric mechanism in this way, the centrifugal force and moment of each eccentric component are calculated to meet the balance of the resultant force and the resultant moment, and finally the specific size of the structure is designed to achieve the effect of dynamic balance.

[0047] Embodiment 3:

[0048] like Figure 8 As shown, a third embodiment of the present invention is given.

[0049] The rotation center axis of the crankshaft 13 and the eccentric part 13a of the crankshaft are used to distinguish the same side and opposite side position relationship of each component in the view. Among them, the movable scroll plate 6, the inner hole 11a of the balancing sleeve 11 and the eccentric part 13a of the crankshaft are on the same side, and the third balancing block 16 is on the opposite side of the eccentric part 13a of the crankshaft and is fixed on the crankshaft 13. The first balancing block 19 is fixed to the upper end of the motor rotor 17 and is on the same side as the eccentric part 13a of the crankshaft. After arranging the eccentric mechanism in this way, the centrifugal force and moment of each eccentric component are calculated to meet the balance of the resultant force and the resultant moment, and finally the specific size of the structure is designed to achieve the effect of dynamic balance.

[0050] Embodiment 4:

[0051] like Fig. 9As shown, a fourth embodiment of the present invention is given.

[0052] The rotation center axis of the crankshaft 13 and the eccentric portion 13a of the crankshaft are used to distinguish the same-side and opposite-side positional relationships of the components in the view. Among them, the movable scroll 6, the inner hole 11a of the balancing sleeve 11 and the eccentric portion 13a of the crankshaft are on the same side, and the third balancing block 16 is on the opposite side of the eccentric portion 13a of the crankshaft and is fixed on the crankshaft 13. The first balancing block 19 is fixed to the lower end of the motor rotor 17 and is on the same side as the eccentric portion 13a of the crankshaft. The third balancing block 19a is fixed to the upper end of the motor rotor 17 and is on the opposite side of the eccentric portion 13a of the crankshaft. After arranging the eccentric mechanism in this way, the centrifugal force and moment of each eccentric component are calculated to meet the balance of the resultant force and the resultant moment, and finally the specific size of the structure is designed to achieve the effect of dynamic balancing.

[0053] Embodiment 5:

[0054] like Fig.10 As shown, a fifth embodiment of the present invention is given.

[0055] The rotation center axis of the crankshaft 13 and the eccentric portion 13a of the crankshaft are used to distinguish the same-side and opposite-side positional relationships of the components in the view. Among them, the movable scroll 6, the inner hole 11a of the balancing sleeve 11 and the eccentric portion 13a of the crankshaft are on the same side, and the third balancing block 16 is on the opposite side of the eccentric portion 13a of the crankshaft and is fixed on the crankshaft 13. The first balancing block 19 is fixed to the lower end of the motor rotor 17 and is on the opposite side of the eccentric portion 13a of the crankshaft. The third balancing block 19a is fixed to the upper end of the motor rotor 17 and is on the same side as the eccentric portion 13a of the crankshaft. After arranging the eccentric mechanism in this way, the centrifugal force and moment of each eccentric component are calculated to meet the balance of the resultant force and moment, and finally the specific size of the structure is designed to achieve the effect of dynamic balancing.

[0056] The present invention also provides an air conditioner, comprising the scroll compressor.

[0057] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A scroll compressor shaft balancing structure, characterized in that: The invention comprises a crankshaft (13), a movable scroll (6), and an upper bracket (8), wherein the movable scroll (6) has a movable scroll bearing seat (6a), the crankshaft (13) has a crankshaft eccentric portion (13a) which is rotatably inserted into the movable scroll bearing seat (6a), the upper bracket (8) is provided with a sleeve matching hole (8a), and further comprises a balancing sleeve (11), wherein the balancing sleeve (11) has an inner hole (11a) and an outer circle (11b), wherein the movable scroll bearing seat (6a) is rotatably inserted into the inner hole (11a), the balancing sleeve (11) is rotatably inserted into the sleeve matching hole (8a), the center of the outer circle (11b) coincides with the rotation center of the crankshaft (13), and the center of the inner hole (11a) does not coincide with the center of the outer circle (11b).

2. The scroll compressor shaft balancing structure according to claim 1, characterized in that: The straight shaft section of the crankshaft (13) is rotatably supported on the upper bracket (8) via a first sliding bearing (15).

3. The scroll compressor shaft system balancing structure according to claim 1, characterized in that: A motor rotor (17) is sleeved on the straight shaft section of the crankshaft (13); a first balancing block (19) is connected to one shaft end of the motor rotor (17); and a second balancing block (19a) is connected to the other shaft end of the motor rotor (17).

4. The scroll compressor shaft balancing structure according to any one of claims 1 to 3, characterized in that: A third balancing block (16) is mounted on the straight shaft section of the crankshaft (13).

5. The scroll compressor shaft balancing structure according to claim 4, characterized in that: The third balancing block (16) is arranged on the straight shaft section between the upper bracket (8) and the motor rotor (17).

6. The scroll compressor shaft balancing structure according to claim 4, characterized in that: The third balancing block (16) comprises a sleeve sleeve that is sleeved with the straight shaft section, and the third balancing block (16) is connected to the straight shaft section via the sleeve sleeve.

7. The scroll compressor shaft balancing structure according to claim 1, characterized in that: The crankshaft (13) has a lubricating oil passage extending through the crankshaft in its axial direction, and the lubricating oil passage has an oil outlet located at a first axial end of the crankshaft (13), the first axial end being the axial end of the crankshaft (13) located in the movable plate bearing seat (6a).

8. A scroll compressor, characterized in that: The invention comprises the scroll compressor shaft system balancing structure according to any one of claims 1 to 7.

9. An air conditioner, characterized in that: Includes the scroll compressor as described in claim 8.

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