Swivel assembly and scroll compressor and control method thereof

Abstract

The application provides a rotating shaft assembly, a scroll compressor and a control method thereof. The rotating shaft assembly comprises a bearing chamber and a bearing arranged in the bearing chamber, and the bearing is sleeved with a rotating shaft. A gap is arranged between the outer wall of the bearing and the inner wall of the bearing chamber, and the gap is adjustable. The application sets the gap in the bearing in the bearing chamber, and the size of the gap is adjustable. The vibration occurring in the operation of the rotating shaft is improved, which helps to reduce abnormal noise and vibration that may be generated due to changes in working conditions during the operation of the compressor and improves the user experience.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of scroll compressors, and particularly relates to a rotating shaft assembly, a scroll compressor and a control method thereof. BACKGROUND

[0002] During the operation of a scroll compressor, bearing stiffness has a significant impact on shafting modal, which may further affect the noise and vibration level of the compressor. The existing scroll compressor design usually fails to fully consider the change of bearing stiffness under dynamic conditions, which may cause resonance problems under certain operating conditions, thereby affecting the performance and service life of the compressor. Therefore, a device and method capable of dynamically controlling bearing stiffness are needed to avoid resonance to optimize the noise and vibration level of the scroll compressor.

[0003] One of the patent applications disclosed in the patent literature discloses a scroll compressor to improve shaft stiffness by changing the support position of the lower bracket, reducing the span between the upper bracket and the lower bracket, and reducing the deflection of the crankshaft while increasing the crankshaft modal frequency. However, this method cannot prevent the shafting modal from being excited by excitation force under different operating conditions (different speeds and different temperatures).

[0004] The second patent application disclosed in the patent literature discloses a compressor applying magnetic suspension bearings, which increases the shaft diameter to improve the shaft stiffness and further increase the shaft modal frequency. However, the cost is too high and the shaft modal cannot be adjusted according to the operating conditions.

[0005] The above patent literature improves the shaft stiffness of the compressor by changing the structure to prevent the shafting modal from being excited and causing resonance to produce abnormal noise and vibration, but cannot adjust the shafting modal to prevent it from being excited according to different operating conditions. SUMMARY

[0006] Therefore, the application provides a rotating shaft assembly, a scroll compressor and a control method thereof, which can solve the problem that the shafting modal cannot be adjusted to prevent it from being excited according to different operating conditions in the prior art.

[0007] To solve the above problems, the application provides a rotating shaft assembly, comprising:

[0008] a bearing chamber and a bearing arranged in the bearing chamber, the bearing being sleeved with a rotating shaft;

[0009] a gap is arranged between the outer wall of the bearing and the inner wall of the bearing chamber, and the gap is adjustably arranged.

[0010] In some embodiments,

[0011] The bearing comprises a sliding bearing, a ring-shaped sealing cavity is formed between the outer wall of the sliding bearing and the inner wall of the bearing chamber, at least two baffles are arranged in the sealing cavity, so that the sealing cavity is circumferentially divided into two chambers: a first chamber and a second chamber; the pressure difference between the first chamber and the second chamber is adjusted to make the sliding bearing move radially.

[0012] In some embodiments,

[0013] A reset member is arranged in the first chamber, and the two ends of the reset member abut against the outer wall of the sliding bearing and the inner wall of the bearing chamber; a gas hole is arranged on the wall of the bearing chamber, and the gas hole is in communication with the second chamber; the air pressure in the second chamber is adjusted through the gas hole to change the radial movement state of the sliding bearing.

[0014] In some embodiments,

[0015] The baffles are arranged symmetrically on both sides of the sliding bearing.

[0016] According to another aspect of the present application, a scroll compressor is provided, comprising the rotating shaft assembly as described above.

[0017] In some embodiments,

[0018] The bearing chamber is arranged in the bracket of the scroll compressor, and the gas hole is in communication with the exhaust cavity of the scroll compressor through a pipeline.

[0019] In some embodiments,

[0020] The scroll compressor further comprises a frequency converter, and the frequency of the frequency converter is changed to control the rotating speed of the rotating shaft.

[0021] In some embodiments,

[0022] The scroll compressor further comprises a temperature detection module for monitoring the temperature of the lubricating oil between the sliding bearing and the rotating shaft.

[0023] According to another aspect of the present application, a control method of the scroll compressor as described above is provided, comprising:

[0024] Collecting the real-time vibration of the scroll compressor;

[0025] If the real-time vibration exceeds the preset range, the radial movement of the sliding bearing is adjusted, or / and the frequency of the frequency converter is adjusted to change the rotating speed of the rotating shaft, so that the real-time vibration is within the preset range.

[0026] In some embodiments,

[0027] The preset range includes a bearing stiffness range of the sliding bearing, and the bearing stiffness is defined by a rotating speed of the rotating shaft, a gap distance of the sliding bearing, and a temperature of lubricating oil between the sliding bearing and the rotating shaft.

[0028] The application provides a rotating shaft assembly, comprising: a bearing chamber and a bearing arranged in the bearing chamber, and a rotating shaft sleeved with the bearing; a gap is arranged between an outer wall of the bearing and an inner wall of the bearing chamber, and the gap is adjustable.

[0029] The application has the following beneficial effects:

[0030] The gap between the bearing in the bearing chamber is adjustable, which can improve the vibration during the operation of the rotating shaft, and can help to reduce abnormal noise and vibration caused by changes in working conditions during the operation of the compressor, and improve user experience. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0032] Figure 1 It is a structural schematic view of the rotating shaft assembly of the embodiment of the application.

[0033] Figure 2 It is a sectional view of A-A in the embodiment of the application. Figure 1

[0034] Figure 3 It is a control scheme flow chart of the scroll compressor of the embodiment of the application.

[0035] The signs are represented as:

[0036] 1, upper support; 2, air hole; 3, sliding bearing; 4, lubricating oil; 5, rotating shaft; 6, lower support; 7, return spring; 8, baffle; 9, first chamber; 10, second chamber. DETAILED DESCRIPTION

[0037] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one example embodiment is merely illustrative in nature and does not limit the application or its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0039] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0040] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0041] For reference Figures 1 to 3 As shown in the drawings, according to the embodiments of the present application, a rotating shaft assembly comprises:

[0042] The bearing chamber and the bearing arranged in the bearing chamber, the bearing sleeve is provided with a rotating shaft 5;

[0043] A gap is provided between the outer wall of the bearing and the inner wall of the bearing chamber, and the gap is adjustable.

[0044] The gap between the bearing and the bearing chamber is adjustable, which can improve the vibration of the rotating shaft 5 during operation, reduce abnormal noise and vibration that may occur due to changes in working conditions during compressor operation, and improve user experience.

[0045] During high-speed operation of the rotating shaft 5, changes in the operating environment, including rotational angular velocity, dynamic viscosity of the lubricating oil 4, and the gap of the bearing, can all cause resonance and generate large vibrations. The gap between the bearing and the bearing chamber is adjustable, which can adjust the gap of the bearing when vibration occurs during operation of the rotating shaft 5, equivalent to changing the shafting state that causes resonance. This ensures that the shafting mode that causes resonance is not excited, and the adjustment and control are performed dynamically.

[0046] The above-mentioned bearing includes a sliding bearing 3 and a rolling bearing, and only the position of the bearing in the bearing chamber needs to be adjusted in the radial direction to change the shafting state and eliminate the state that causes resonance, thereby reducing noise, improving operation stability, and prolonging service life.

[0047] In some embodiments,

[0048] The bearing includes a sliding bearing 3, and a ring-shaped sealed cavity is formed between the outer wall of the sliding bearing 3 and the inner wall of the bearing chamber. At least two baffles 8 are provided in the sealed cavity, so that the sealed cavity is divided into two chambers in the circumferential direction: a first chamber 9 and a second chamber 10. The pressure difference between the first chamber 9 and the second chamber 10 is adjusted to cause the sliding bearing 3 to move in the radial direction.

[0049] The following describes the bearing using a sliding bearing 3, and the rolling bearing can be used by reference.

[0050] An oil film layer of lubricating oil 4 is provided between the sliding bearing 3 and the rotating shaft 5 to achieve sliding support. In the gap structure between the sliding bearing 3 and the bearing chamber, the gap is provided as a ring-shaped sealed cavity structure, and two baffles 8 are provided in the ring-shaped sealed cavity to divide the sealed cavity into two chambers (the two baffles 8 are arranged to be separated): a first chamber 9 and a second chamber 10. The pressure difference between the first chamber 9 and the second chamber 10 is adjusted to cause the sliding bearing 3 to move in the radial direction and change the shafting state.

[0051] The rolling bearing is provided as a sealed cavity structure between the outer ring and the inner wall of the bearing chamber, and a baffle 8 is provided in the sealed cavity, which can also achieve radial movement of the rolling bearing.

[0052] In some embodiments,

[0053] The first chamber 9 is provided with a reset member, and the two ends of the reset member abut against the outer wall of the sliding bearing 3 and the inner wall of the bearing chamber; the wall of the bearing chamber is provided with a gas hole 2, and the gas hole 2 is in communication with the second chamber 10; the air pressure in the second chamber 10 is adjusted through the gas hole 2, and the radial movement state of the sliding bearing 3 is changed.

[0054] The first chamber 9 and the second chamber 10 are different in structure for adjusting the size of the gap, that is, the first chamber 9 is provided with a reset member, and the second chamber 10 is provided with a gas hole for changing the pressure in the second chamber 10; in this way, the sliding bearing 3 moves radially in the bearing chamber, and when the gas pressure injected into the second chamber 10 is greater than the effect of the reset member, the sliding bearing 3 moves to the side of the first chamber 9, and the gas in the second chamber 10 is discharged, and the reset member can push the sliding bearing 3 to move to the side of the second chamber 10.

[0055] In some embodiments,

[0056] The baffle plate 8 is provided with two baffle plates, and the two baffle plates are symmetrically arranged on the two sides of the sliding bearing 3.

[0057] The baffle plate 8 is provided with two baffle plates, and the two baffle plates are symmetrically arranged on the two sides of the sliding bearing 3.

[0058] According to another aspect of the present application, a scroll compressor is provided, which comprises the rotating shaft assembly as described above.

[0059] In some embodiments,

[0060] The bearing chamber is arranged in the bracket of the scroll compressor, and the gas hole 2 is in communication with the exhaust cavity of the scroll compressor through a pipeline.

[0061] The bearing chamber is arranged in the bracket of the scroll compressor, and the gas hole 2 is in communication with the exhaust cavity of the scroll compressor through a pipeline.

[0062] In actual operation, the exhaust pressure is adjusted and then input into the gas hole 2; when the rotating shaft 5 is vertically arranged, the bracket includes an upper bracket and a lower bracket 6, and each bracket can be provided with a corresponding rotating shaft assembly to respectively control the movement of the bearing in the bearing chamber, or the rotating shaft assemblies can be combined to control the movement of the bearing.

[0063] In some embodiments,

[0064] The scroll compressor further comprises a frequency converter, and the frequency of the frequency converter is changed to control the rotating speed of the rotating shaft 5.

[0065] For the shafting dynamics of the scroll compressor, the rotational speed of the rotating shaft 5 can also be adjusted, mainly by changing the frequency of the motor part in the scroll compressor through the frequency converter, so as to adjust the shafting mode and avoid resonance.

[0066] In some embodiments,

[0067] The scroll compressor further comprises a temperature detection module for monitoring the temperature of the lubricating oil 4 between the sliding bearing 3 and the rotating shaft 5.

[0068] During the operation of the scroll compressor, the viscosity of the lubricating oil 4 between the sliding bearing 3 and the rotating shaft 5 also affects the state of the shafting, and the viscosity of the lubricating oil 4 is directly related to the temperature. By determining the temperature of the lubricating oil 4, in combination with the rotational speed of the rotating shaft 5 and the gap between the bearing and the bearing chamber, the state of the entire shafting can be determined, and adjustment can be made to eliminate the resonance phenomenon.

[0069] According to another aspect of the present application, a control method of the scroll compressor as described above is provided, comprising:

[0070] Collecting the real-time vibration of the scroll compressor;

[0071] If the real-time vibration exceeds the preset range, adjusting the radial movement of the sliding bearing 3, or / and adjusting the frequency of the frequency converter to change the rotational speed of the rotating shaft 5, so that the real-time vibration is within the preset range.

[0072] In some embodiments,

[0073] The preset range includes the bearing stiffness range of the sliding bearing 3, which is defined by the rotational speed of the rotating shaft 5, the gap distance of the sliding bearing 3, and the temperature of the lubricating oil 4 between the sliding bearing 3 and the rotating shaft 5.

[0074] The bearing stiffness of the sliding bearing 3 is directly related to the resonance phenomenon of the scroll compressor, and the bearing stiffness has an initial bearing stiffness at the beginning of the selection and design. In addition to the parameters such as bearing material that cannot be changed, the bearing stiffness is also related to conditions such as one-sided gap, rotational speed, and lubricating oil temperature during operation. Therefore, the application proposes to adjust the bearing stiffness by adjusting these parameters, thereby changing the shafting mode and reducing vibration.

[0075] The dynamic viscosity of the lubricating oil 4 is related to the type of lubricating oil 4, temperature, and whether to add additives, which is difficult to control during operation. Therefore, the main control scheme is to control the rotational angular velocity of the shafting and the one-sided gap of the bearing.

[0076] The present application controls the stiffness of the sliding bearing 3 by adjusting the radial movement of the sliding bearing 3, or / and, adjusting the rotational speed of the rotating shaft 5, so as to avoid the excitation of the shafting modal to cause resonance.

[0077] By monitoring and adjusting the relevant parameters that affect the stiffness of the sliding bearing 3 in real time, the frequency of the shafting modal of the scroll compressor is controlled, and the resonance phenomenon that may occur during the operation of the scroll compressor is reduced, which can effectively reduce the noise and vibration level of the scroll compressor, and significantly improve the operation stability and efficiency of the scroll compressor. The specific effects include:

[0078] 1. Reduce noise and vibration: By dynamically adjusting the relevant parameters of the sliding bearing 3 (shafting angular velocity, bearing single-sided gap, etc.), the bearing stiffness is optimized, so as to adjust the shafting modal, which helps to reduce abnormal noise and vibration that may occur during the operation of the compressor due to changes in working conditions, and improves user experience.

[0079] 2. Reduce resonance: By dynamically adjusting the relevant parameters of the sliding bearing 3 (shafting angular velocity, bearing single-sided gap, etc.), the bearing stiffness is optimized, which effectively avoids the shafting resonance, increases the operation stability of the scroll compressor, avoids the damage to the scroll compressor caused by resonance, and prolongs its service life.

[0080] 3. Improve energy efficiency: Reasonable bearing stiffness setting can reduce energy loss and improve the energy efficiency ratio of the scroll compressor.

[0081] In the present application, the rotational speed control of the scroll compressor is usually realized by a frequency converter. The frequency converter adjusts the rotational speed of the motor by changing the frequency of the power supply to the motor, and then controls the operating speed of the scroll compressor. This method not only can realize precise control of the rotational speed of the compressor, but also can effectively improve the energy efficiency ratio of the system, reduce energy consumption, and can adjust the operating angular velocity of the scroll compressor in real time to adapt to different working conditions and load requirements.

[0082] The single-sided gap adjustment method of the sliding bearing 3 mainly adjusts the single-sided gap of the bearing by a pneumatic-spring structure to change the bearing stiffness. By using this structure, the single-sided gap of the sliding bearing 3 of the scroll compressor can be adjusted according to the demand, and then the bearing stiffness is changed to achieve the effect of adjusting the shafting modal. This is an important measure to ensure the normal operation of the equipment and improve its service life. By adjusting the single-sided gap, the wear of the bearing can be reduced, and the operation stability and efficiency of the equipment can be improved.

[0083] The single-sided gap adjustment of the sliding bearing 3 can also use hydraulic adjustment, which only needs to replace the pneumatic system with a hydraulic system, and can also use an electric push rod structure for adjustment.

[0084] The application adjusts the shafting modal of the scroll compressor during operation by controlling the stiffness of the scroll compressor sliding bearing 3 to prevent the shafting modal from being excited to cause resonance and abnormal noise vibration.

[0085] The more specific implementation process is as follows:

[0086] 1. Collect the relevant parameters of the scroll compressor shafting structure, material, connection relationship, etc., and the initial sliding bearing 3 stiffness, and use simulation software to simulate and calculate the shafting modal frequency.

[0087] 2. Monitor the scroll compressor noise vibration data, capture the modal resonance abnormal signal through the sensor, and if there is an abnormal signal, feed back to the calculation module to calculate the appropriate rotating speed and single-sided gap of the sliding bearing 3, so that the bearing stiffness meets the shafting modal frequency and is not excited to resonance.

[0088] According to the calculation result of the calculation module, the rotating speed is adjusted by the frequency converter, and the single-sided gap of the sliding bearing 3 is adjusted synchronously. The adjustment method of the single-sided gap of the sliding bearing 3 is: the gas is introduced through the gas hole 2 by the pneumatic adjustment module, the baffle 8 is pushed, the sliding bearing 3 is moved to one side, and the purpose of adjusting the single-sided gap of the sliding bearing 3 is achieved. If it is needed to reset the sliding bearing 3, it is only needed to stop the gas introduction, and the reset member including the spring resets the sliding bearing 3 to the original position. The value of the single-sided gap adjustment of the sliding bearing 3 can also be calculated by the force of the gas introduced to the baffle 8 through the pre-calculation.

[0089] In combination with the temperature monitoring module, the temperature of the lubricating oil 4 is monitored by the temperature sensor, and the real-time data of the dynamic viscosity of the lubricating oil 4 is obtained by calculation and table lookup.

[0090] The application adjusts the rotating speed by the frequency converter, adjusts the single-sided gap of the sliding bearing 3, obtains the dynamic viscosity of the lubricating oil 4 calculated from the temperature of the temperature monitoring module, and obtains the bearing stiffness of the sliding bearing 3 by the liquid dynamic pressure bearing rotor dynamics simulation calculation of the simulation software, so that the bearing stiffness meets the shafting modal frequency and is not excited to resonance. In the same way, the stiffness of the sliding bearing 3 of the lower support 6 can be simulated and calculated, the adjusted shafting modal frequency is calculated by substituting into the modal simulation software, and the result is checked, so that the bearing stiffness meets the shafting modal frequency and is not excited to resonance.

[0091] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0092] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be considered as the protection scope of the present application.

Claims

1. A rotating shaft assembly, characterized in that, The bearing chamber and the bearing arranged in the bearing chamber are provided with a rotating shaft (5); The gap between the outer wall of the bearing and the inner wall of the bearing chamber is adjustable; The sliding bearing (3) is arranged between the outer wall of the sliding bearing (3) and the inner wall of the bearing chamber to form a ring-shaped sealing cavity, at least two baffles (8) are arranged in the sealing cavity, so that the sealing cavity is circumferentially divided into two chambers: a first chamber (9) and a second chamber (10); the pressure difference between the first chamber (9) and the second chamber (10) is adjusted to make the sliding bearing (3) move radially; The reset member is arranged in the first chamber (9), and the two ends of the reset member abut against the outer wall of the sliding bearing (3) and the inner wall of the bearing chamber; the gas hole (2) is arranged on the wall of the bearing chamber, and the gas hole (2) is in communication with the second chamber (10); the air pressure in the second chamber (10) is adjusted through the gas hole (2), and the radial movement state of the sliding bearing (3) is changed.

2. The rotating shaft assembly according to claim 1, wherein: The two baffles (8) are symmetrically arranged on both sides of the sliding bearing (3). The rotating shaft assembly according to claim 1 or 2.

3. A scroll compressor characterized by, 4. The scroll compressor according to claim 3, wherein: The bearing chamber is arranged in the support of the scroll compressor, and the gas hole (2) is in communication with the exhaust cavity of the scroll compressor through a pipeline.

5. The scroll compressor according to claim 4, wherein: The scroll compressor further comprises a frequency converter, and the frequency of the frequency converter is changed to control the rotating speed of the rotating shaft (5).

6. The scroll compressor according to claim 5, wherein: The scroll compressor further comprises a temperature detection module for monitoring the temperature of the lubricating oil (4) between the sliding bearing (3) and the rotating shaft (5). Including:

7. A control method for a scroll compressor as claimed in claim 5 or 6, characterized in that, Collecting the real-time vibration of the scroll compressor; If the real-time vibration exceeds the preset range, the radial movement of the sliding bearing (3) is adjusted, or / and the frequency of the frequency converter is adjusted to change the rotating speed of the rotating shaft (5), so that the real-time vibration is within the preset range.

8. The control method according to claim 7, wherein: The preset range includes the bearing stiffness range of the sliding bearing, and the bearing stiffness is defined by the rotating speed of the rotating shaft (5), the gap distance of the sliding bearing (3), and the temperature of the lubricating oil (4) between the sliding bearing (3) and the rotating shaft (5). ​

Images