Bearing, air conditioning unit and bearing lubrication method

Abstract

The present invention relates to a bearing, an air conditioning unit and a bearing lubrication method, wherein the bearing comprises a bearing body, a monitoring device, a supply device and a control device (5), the bearing body has a bearing surface, at least two preset monitoring points are arranged on the bearing surface, the monitoring device is configured to monitor the size of preset parameters at at least two preset monitoring points, the supply device is configured to provide lubricant to the bearing surface to accelerate the circulation flow speed of the lubricant, the control device (5) is connected to the monitoring device and the supply device by signal, and the control device (5) is configured to compare the monitoring results of the monitoring device and control the opening and closing of the supply device according to the comparison results. The bearing of the present invention can effectively improve the stability of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning units, and in particular to a bearing, an air conditioning unit and a bearing lubrication method. Background Art

[0002] Bearings are key components in centrifugal refrigeration compressors. The function of bearings is to bear the weight of the rotor and its rotational load during operation. In addition to traditional oil lubrication, bearing lubrication can also be done with refrigerant. Lubricating bearings with refrigerant can prevent the mixing of lubricating oil and refrigerant. The refrigerant used for lubrication comes from the condenser.

[0003] However, the lubricity of refrigerant is not as good as that of oil. Refrigerant lubrication will cause serious wear, and as the shaft system runs, the refrigerant inside the bearing will partially flash into gas, causing instability in the shaft system operation process, thereby affecting the reliability and energy efficiency of the compressor operation.

[0004] It should be noted that the information disclosed in the background technology section of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] The embodiments of the present invention provide a bearing, an air conditioning unit and a bearing lubrication method, which solve the problem of unstable bearing operation in the related art.

[0006] According to a first aspect of the present invention, there is provided a bearing, comprising:

[0007] The bearing body has a load-bearing surface, and at least two preset monitoring points are arranged on the load-bearing surface;

[0008] A monitoring device configured to monitor the magnitude of a preset parameter at at least two preset monitoring points;

[0009] A supply device configured to supply lubricant to the bearing surface to increase the circulation speed of the lubricant; and

[0010] The control device is connected to the monitoring device and the supply device by signals. The control device is configured to compare the monitoring results of the monitoring device and control the opening and closing of the supply device according to the comparison results.

[0011] In some embodiments, the bearing further comprises a wear-resistant layer disposed on the load-bearing surface, and the monitoring device is disposed in the wear-resistant layer.

[0012] In some embodiments, the wear-resistant layer includes a first wear-resistant layer and a second wear-resistant layer, and the monitoring device is disposed between the first wear-resistant layer and the second wear-resistant layer.

[0013] In some embodiments, the monitoring device includes a piezoelectric patch.

[0014] In some embodiments, the preset parameter includes at least one of pressure and displacement.

[0015] In some embodiments, the monitoring device includes at least one of a pressure sensor and a displacement sensor.

[0016] In some embodiments, the control device is configured to calculate a variance value according to the monitoring value of the monitoring device, and turn on the supply device when the variance value is greater than a preset value, and turn off the supply device when the variance value is less than the preset value.

[0017] In some embodiments, the number of monitoring devices is the same as the number of preset monitoring points, and the monitoring devices are arranged in a one-to-one correspondence with the preset monitoring points.

[0018] In some embodiments, at least two preset monitoring points are evenly arranged along the circumference of the load-bearing surface.

[0019] According to a second aspect of the present invention, there is provided an air conditioning unit comprising the above-mentioned bearing.

[0020] According to a third aspect of the present invention, there is provided a bearing lubrication method, comprising:

[0021] A bearing body is provided, wherein the bearing body has a bearing surface, and at least two preset monitoring points are arranged on the bearing surface;

[0022] Monitoring the magnitude of a preset parameter at at least two preset monitoring points;

[0023] The monitoring results are compared, and the opening and closing of the supply device is controlled according to the comparison results. The supply device is configured to provide lubricant to the load-bearing surface to speed up the circulation flow rate of the lubricant.

[0024] According to a fourth aspect of the present invention, there is provided a bearing lubrication method for an air conditioner unit based on the above-mentioned bearing lubrication method, comprising:

[0025] Detect whether the air-conditioning unit in working state starts to shut down;

[0026] If yes, turn on the supply.

[0027] Based on the above technical solution, in the embodiment of the present invention, at least two preset monitoring points are provided on the load-bearing surface of the bearing body. By monitoring the preset parameters of the preset monitoring points and comparing the monitoring results, the stress condition of the load-bearing surface can be judged, and the supply device can be opened or closed in a targeted manner according to the stress condition. When a gas-liquid mixing problem occurs, the liquid lubricant can be replenished in time through the supply device and the discharge of the gas-liquid mixture can be accelerated, thereby increasing the concentration of the liquid lubricant and improving the stability of the bearing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 The figure is a schematic structural diagram of an embodiment of an air conditioning unit of the present invention.

[0030] Figure 2 A side view of an embodiment of a bearing of the present invention.

[0031] Figure 3 It is a schematic diagram of the internal structure of a bearing embodiment of the present invention and an enlarged view of part of the structure.

[0032] In the figure:

[0033] 1. Compressor; 2. Condenser; 3. Throttling element; 4. Evaporator; 5. Control device; 6. Refrigerant pump;

[0034] 10. First bearing surface; 20. Second bearing surface; 30. First preset monitoring point; 40. Second preset monitoring point; 50. First bearing body; 60. Second bearing body;

[0035] 11. First wear-resistant layer; 12. Second wear-resistant layer; 13. First piezoelectric sheet; 21. Third wear-resistant layer; 22. Fourth wear-resistant layer; 23. Second piezoelectric sheet. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying 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. 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.

[0037] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0038] refer to Figure 1-3As shown, in some embodiments of the bearing provided by the present invention, the bearing includes a bearing body, a monitoring device, a supply device and a control device 5, the bearing body has a bearing surface, and at least two preset monitoring points are arranged on the bearing surface, the monitoring device is configured to monitor the size of the preset parameters at at least two preset monitoring points, the supply device is configured to provide lubricant to the bearing surface and accelerate the circulation flow rate of the lubricant, the control device 5 is signal-connected with the monitoring device and the supply device, and the control device 5 is configured to compare the monitoring results of the monitoring device and control the opening and closing of the supply device according to the comparison results.

[0039] In the above embodiment, at least two preset monitoring points are provided on the load-bearing surface of the bearing body. By monitoring the preset parameters of the preset monitoring points and comparing the monitoring results, the stress condition of the load-bearing surface can be judged, and the supply device can be opened or closed in a targeted manner according to the stress condition. When a gas-liquid mixing problem occurs, the liquid lubricant can be replenished in time through the supply device and the discharge of the gas-liquid mixture can be accelerated, thereby increasing the concentration of the liquid lubricant and improving the stability of the bearing operation.

[0040] When it is judged according to the monitoring results of the monitoring device that the force on the load-bearing surface is relatively uniform, the supply device can be closed to save lubricant and energy; when it is judged according to the monitoring results of the monitoring device that the force on the load-bearing surface is uneven, the supply device can be turned on. The supply device can replenish lubricant to the load-bearing surface and at the same time speed up the circulation flow rate of the lubricant, thereby accelerating the discharge of the gas-liquid mixture, increasing the lubricant concentration, improving the uniformity of the force on the load-bearing surface, and thereby improving the stability of the bearing operation.

[0041] When the embodiment of the present invention is applied to an air conditioning unit, the supply device may be connected to the condenser, and the lubricant provided by the supply device may be the refrigerant from the condenser.

[0042] In other embodiments, the lubricant may also be other objects with lubricating properties, such as air, nitrogen, lubricating oil or lubricating liquid.

[0043] In some embodiments, the bearing further comprises a wear-resistant layer disposed on the load-bearing surface, and the monitoring device is disposed in the wear-resistant layer.

[0044] The wear-resistant layer is arranged on the load-bearing surface, and the wear-resistant layer is located between the load-bearing surface and the part to be supported. The bearing can support the part to be supported.

[0045] By providing a wear-resistant layer, the wear resistance of the load-bearing surface can be improved, the load-bearing surface and the supported parts can be prevented from being worn, and the service life of the bearing and the supported parts can be increased.

[0046] The wear-resistant layer also facilitates the installation of the monitoring device. The monitoring device is arranged inside the wear-resistant layer, which can avoid structural modification of the bearing body, for example, there is no need to drill a hole in the bearing body for installing the monitoring device.

[0047] The material of the wear-resistant layer can be polytetrafluoroethylene or molybdenum disulfide.

[0048] In some embodiments, the wear-resistant layer includes a first wear-resistant layer 11 and a second wear-resistant layer 12, and the monitoring device is disposed between the first wear-resistant layer 11 and the second wear-resistant layer 12. By providing two wear-resistant layers, it is convenient to hide the monitoring device, ensure the installation stability of the monitoring device, and avoid collision and friction between the support member and the monitoring device.

[0049] In some embodiments, the monitoring device includes a piezoelectric sheet. The piezoelectric sheet is small in size and can be easily buried in the wear-resistant layer. The piezoelectric sheet generates current when it is compressed, and this characteristic can be used to monitor the compression of the wear-resistant layer in real time, so as to judge whether the bearing runs smoothly.

[0050] In some embodiments, the preset parameter includes at least one of pressure and displacement.

[0051] In some embodiments, the monitoring device includes at least one of a pressure sensor and a displacement sensor.

[0052] By detecting the pressure at the preset monitoring point through the pressure sensor, the stress condition of the load-bearing surface can be determined according to the pressure, and then the operation condition of the bearing can be determined according to the stress condition.

[0053] The displacement sensor can be used to monitor the displacement of the support member relative to the bearing body, thereby determining whether the bearing is running smoothly.

[0054] In some embodiments, the control device 5 is configured to calculate a variance value according to the monitoring value of the monitoring device, and turn on the supply device when the variance value is greater than a preset value, and turn off the supply device when the variance value is less than the preset value.

[0055] By calculating the variance value, the uniformity of the preset parameters between each preset monitoring point can be determined. If the variance value is less than the preset value, it means that the uniformity of the preset parameters between each preset monitoring point is good, and then the stability of the bearing operation is also good. At this time, the supply device can be closed; if the variance value is greater than the preset value, it means that the uniformity of the preset parameters between each preset monitoring point is poor, and then the stability of the bearing operation is also poor. At this time, the supply device can be opened to replenish the lubricant and speed up the flow rate of the lubricant circulation to increase the lubricant concentration and improve the stability of the bearing operation.

[0056] In some embodiments, the number of monitoring devices is the same as the number of preset monitoring points, and the monitoring devices are arranged in a one-to-one correspondence with the preset monitoring points. The number of monitoring devices and the number of preset monitoring points can be flexibly set according to actual conditions.

[0057] In some embodiments, at least two preset monitoring points are evenly arranged along the circumference of the bearing surface. Such an arrangement is conducive to comprehensive monitoring, and the operation status of the bearing can be judged according to the monitoring status of each position.

[0058] Based on the above-mentioned bearing, the present invention further provides an air-conditioning unit, which includes the above-mentioned bearing.

[0059] The present invention also provides a bearing lubrication method, comprising:

[0060] A bearing body is provided, wherein the bearing body has a bearing surface, and at least two preset monitoring points are arranged on the bearing surface;

[0061] Monitoring the magnitude of a preset parameter at at least two preset monitoring points;

[0062] The monitoring results are compared, and the opening and closing of the supply device is controlled according to the comparison results. The supply device is configured to provide lubricant to the load-bearing surface to speed up the circulation flow rate of the lubricant.

[0063] Based on the above bearing lubrication method, the present invention also provides an air conditioner unit bearing lubrication method, comprising:

[0064] Detect whether the air-conditioning unit in working state starts to shut down;

[0065] If yes, turn on the supply.

[0066] The step of detecting whether the air conditioner unit in the working state starts to shut down can be achieved by detecting whether the compressor is shut down. The compressor is connected to the control device by signal, so that the opening and closing conditions of the compressor are fed back to the control device.

[0067] In the embodiment of the present invention, the bearing can be a radial bearing or an axial bearing. When the bearing body is a radial bearing, the load-bearing surface is the inner side surface of the inner ring of the radial bearing, and the inner side surface is an annular curved surface surrounding the center line of the bearing. When the bearing body is an axial bearing, the load-bearing surface is the outer end surface of the axial bearing, and the end surface is a plane perpendicular to the center line of the bearing.

[0068] In the embodiments of the air conditioning unit of the present invention, radial bearings may be included, axial bearings may be included, or both radial bearings and axial bearings may be included.

[0069] like Figure 1As shown, the air conditioning unit includes a compressor 1, a condenser 2, a throttling element 3 and an evaporator 4. The supply device includes a refrigerant pump 6, and the control device 5 is connected to the refrigerant pump 6 by signal. When the refrigerant pump 6 is turned on, the refrigerant in the condenser 2 can be delivered to the bearing surface of the bearing to replenish the liquid refrigerant. At the same time, the power of the refrigerant pump 6 can also accelerate the circulation of the refrigerant and increase the concentration of the liquid refrigerant at the bearing surface, thereby improving the stability of the bearing operation. When the refrigerant pump 6 is turned off, the refrigerant is stopped from being delivered to the bearing surface of the bearing.

[0070] like Figure 2 and Figure 3 As shown, the bearing includes an axial bearing and a radial bearing, the axial bearing includes a first bearing body 50, the first bearing body 50 has a first bearing surface 10, the first bearing surface 10 is a plane perpendicular to the center line of the axial bearing, and four first preset monitoring points 30 are evenly arranged along the circumference of the bearing. In other embodiments, the number of the first preset monitoring points 30 can also be two, three or more.

[0071] The radial bearing includes a second bearing body 60, the second bearing body 60 has a second bearing surface 20, the second bearing surface 20 is an annular curved surface surrounding the center line of the axial bearing, and four second preset monitoring points 40 are evenly arranged along the circumference of the bearing. In other embodiments, the number of the second preset monitoring points 40 can also be two, three or more.

[0072] like Figure 3 As shown, the first wear-resistant layer 11, the first piezoelectric sheet 13 and the second wear-resistant layer 12 are sequentially arranged on the outer side of the first bearing surface 10. The first wear-resistant layer 11 is arranged on one side of the first bearing surface 10, the second wear-resistant layer 12 is arranged on the side of the first wear-resistant layer 11 away from the first bearing surface 10, and the first piezoelectric sheet 13 is arranged between the first wear-resistant layer 11 and the second wear-resistant layer 12.

[0073] The inner side of the second bearing surface 20 is provided with a third wear-resistant layer 21, a second piezoelectric sheet 23 and a fourth wear-resistant layer 22 in sequence. The third wear-resistant layer 21 is provided on the inner side of the second bearing surface 20, the fourth wear-resistant layer 22 is provided on the side of the third wear-resistant layer 21 away from the second bearing surface 20, and the second piezoelectric sheet 23 is provided between the third wear-resistant layer 21 and the fourth wear-resistant layer 22.

[0074] For radial bearings, a wear-resistant coating is applied on the inner surface. For thrust bearings, a wear-resistant coating is applied on the thrust surface. A wear-resistant layer is applied on the surface where the bearing contacts the refrigerant. The wear-resistant layer can resist the corrosion of the refrigerant, thereby reducing the wear caused by the low lubrication performance of the refrigerant. Inside the wear-resistant layer, a piezoelectric sheet is embedded. There are multiple pressure monitoring points evenly distributed on the bearing's load-bearing surface, which can convert the pressure on the inner surface of the bearing into an electrical signal for output. Among them, four pressure detection points are evenly distributed on the inner pressure surface of the radial bearing. This ensures that before starting up, the bottom of the bearing is under pressure, the top is not under pressure, and the variance of the output signals of the four pressure monitoring points is the largest. Four pressure monitoring points can also be evenly distributed on the thrust surface of the bearing to detect the pressure on the thrust surface.

[0075] For the air-conditioning system, the control device can store the collected signals and perform calculations to solve the variance. When the variance exceeds the set threshold range, the control device will control the refrigerant pump to open, thereby accelerating the circulation of the refrigerant inside the bearing, that is, quickly pumping the high-concentration refrigerant from the condenser into the bearing, thereby ensuring the purity of the refrigerant and improving the stability of the shaft system operation, realizing the detection of refrigerant mixing conditions and targeted compensation for the refrigerant purity inside the bearing.

[0076] The control device and the compressor exchange signals via two channels, one for collecting the electrical signals from the piezoelectric film inside the bearing, and the other for collecting the on / off signals of the unit.

[0077] Before the main motor of the compressor unit is turned on, the control device is turned on first. At this time, the motor main shaft is pressed on the bottom of the bearing due to gravity, the bottom of the bearing is under pressure, but the top is not under pressure. At this time, the variance of the electrical signal collected by the control device from the monitoring device is at the maximum value, which is greater than the threshold set by the control device. The control device outputs the start signal to the refrigerant pump to start the refrigerant pump and extract liquid refrigerant from the condenser to supply the bearing with refrigerant with sufficient flow and pressure difference to ensure sufficient lubrication of the bearing and prevent internal wear of the bearing. After that, the compressor starts to run. When the signal variance collected by the control device is less than the set threshold, the control device turns off the refrigerant pump. Although the pressure difference established between the evaporator and the condenser can also ensure the refrigerant supply during the operation of the unit. However, the mixing effect caused by the flash of the refrigerant cannot be eliminated by relying on the pressure difference. Mixing will cause the shaft system to be unstable and affect the stability and reliability of the unit operation. Therefore, when the mixing degree increases to a certain value, so that the variance of the electrical signal collected by the control device exceeds the set threshold, the control device will turn on the refrigerant pump again to accelerate the refrigerant circulation, so that the high-purity liquid refrigerant quickly flows into the bearing, and promptly discharges the refrigerant with a large mixing degree inside the bearing, thereby improving the purity of the refrigerant inside the bearing and ensuring the reliable operation of the shaft system. When the unit is shut down, the control device collects the shutdown signal, and the program automatically outputs a start signal to the refrigerant pump to turn on the refrigerant pump to ensure that the bearing is supplied with liquid when the main motor is idling. After the main motor stops completely, the refrigerant pump is turned off again.

[0078] For the control device, the signal acquisition time step can be set according to the situation. When the time step is too small, a large amount of memory is required; when the time step is large, fewer samples are collected and the stable operation of the axis system cannot be accurately controlled.

[0079] The embodiment of the present invention is to coat the radial inner surface and axial thrust surface of the bearing with a coating resistant to refrigerant corrosion, and embed a monitoring device inside the coating. By performing post-processing analysis on the data collected by the monitoring device, a signal is generated to control the opening and closing degree of the refrigerant pump, thereby ensuring the purity of the refrigerant in the bearing and improving the reliability of the shaft system operation. The embodiment of the present invention can reduce the serious wear of the bearing caused by the low lubricity of the refrigerant. For the problem of mixing of the lubricating film caused by the flash of the refrigerant, the control device can be used to perform targeted compensation for the control of the opening and closing of the refrigerant pump. Moreover, the refrigerant pump is controlled by the control device throughout the entire process, and there is no need for manual start and stop, which greatly improves the convenience of operation.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A bearing, characterized in that: include: The bearing body has a load-bearing surface, and at least two preset monitoring points are arranged on the load-bearing surface; A monitoring device configured to monitor the magnitude of a preset parameter at at least two of the preset monitoring points; A supply device, configured to provide lubricant to the bearing surface to accelerate the circulation flow rate of the lubricant; and A control device (5) is connected to the monitoring device and the supply device by signals, and the control device (5) is configured to compare the monitoring results of at least two of the preset monitoring points monitored by the monitoring device to determine whether the force on the load-bearing surface is uniform, and to close the supply device when it is determined that the force on the load-bearing surface is uniform; When it is determined that the force on the load-bearing surface is uneven, the supply device is turned on; The control device (5) is configured to calculate a variance value based on the monitoring value of the monitoring device, and to determine that the force on the load-bearing surface is uneven and to open the supply device when the variance value is greater than a preset value, and to determine that the force on the load-bearing surface is uniform and to close the supply device when the variance value is less than the preset value.

2. The bearing according to claim 1, characterized in that: It also includes a wear-resistant layer arranged on the load-bearing surface, and the monitoring device is arranged in the wear-resistant layer.

3. The bearing according to claim 2, characterized in that: The wear-resistant layer comprises a first wear-resistant layer (11) and a second wear-resistant layer (12), and the monitoring device is arranged between the first wear-resistant layer (11) and the second wear-resistant layer (12).

4. The bearing according to any one of claims 1 to 3, characterized in that: The monitoring device includes a piezoelectric piece.

5. The bearing according to claim 1, characterized in that: The preset parameter includes at least one of pressure and displacement.

6. The bearing according to claim 1, characterized in that: The monitoring device includes at least one of a pressure sensor and a displacement sensor.

7. The bearing according to claim 1, characterized in that The number of the monitoring devices is the same as the number of the preset monitoring points, and the monitoring devices are arranged in a one-to-one correspondence with the preset monitoring points.

8. The bearing according to claim 1, characterized in that: At least two of the preset monitoring points are evenly arranged along the circumference of the load-bearing surface.

9. An air conditioning unit, characterized in that: Comprising the bearing according to any one of claims 1 to 8.

10. A bearing lubrication method, characterized in that: include: Providing a bearing body, the bearing body having a bearing surface, and the bearing surface is provided with at least two preset monitoring points; Monitoring the magnitudes of preset parameters at at least two of the preset monitoring points; Comparing the monitoring results of at least two of the preset monitoring points to determine whether the force on the load-bearing surface is uniform, and closing the supply device when it is determined that the force on the load-bearing surface is uniform; and opening the supply device when it is determined that the force on the load-bearing surface is uneven; the supply device is configured to provide lubricant to the load-bearing surface to speed up the circulation flow speed of the lubricant; The operation of comparing the monitoring results of at least two preset monitoring points includes: The variance value is calculated based on the monitoring values ​​of at least two of the preset monitoring points, and when the variance value is greater than the preset value, it is judged that the force on the load-bearing surface is uneven and the supply device is turned on, and when the variance value is less than the preset value, it is judged that the force on the load-bearing surface is uniform and the supply device is turned off.

11. A bearing lubrication method for an air conditioning unit based on the bearing lubrication method according to claim 10, characterized in that: include: Detect whether the air-conditioning unit in working state starts to shut down; If so, open the supply device.

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