Multi-channel bearing cooling component, compressor and operating method thereof, and air conditioning equipment

Abstract

The present invention relates to a multi-channel bearing cooling component (100) for cooling a bearing installed therein, characterized in that the multi-channel bearing cooling component (100) is provided with: a bearing installation cavity (101) for installing the bearing; a plurality of cooling medium inlets (102) for introducing cooling medium into the interior thereof; a plurality of liquid storage cavities (103) respectively connected to the plurality of cooling medium inlets (102) in a one-to-one correspondence to receive the introduced cooling medium, the plurality of liquid storage cavities (103) are fluidically isolated from each other, and the plurality of liquid storage cavities (103) are all connected to the bearing installation cavity (101) in a fluidic manner; and a cooling medium outlet (104) connected to the bearing installation cavity (101) in a fluidic manner so that the cooling medium flows out of the multi-channel bearing cooling component (100). A compressor having the multi-channel bearing cooling component, an operating method thereof, and an air conditioning device are also provided. The present invention improves the defect of insufficient bearing cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a multi-channel bearing cooling component, a compressor and an operating method thereof, and air conditioning equipment. Background Art

[0002] Whether it is a sliding bearing or a rolling bearing, the bearing will generate heat during the operation of the machine and needs to be lubricated. Generally speaking, most bearings in the industrial field are cooled by lubricating oil, which is used to remove the heat generated when the shaft rotates at high speed relative to the bearing. For centrifugal compressors, large cooling capacity, heavy load and low speed models generally use sliding bearings, while small cooling capacity, light load and high speed models generally use rolling bearings. In comparison, rolling bearings generate less heat than sliding bearings.

[0003] Lubricating oil cooling is common in liquid lubrication. For compressors, the refrigerant can also be used as a cooling medium under certain conditions. Since the refrigerant is more volatile than the lubricating oil and is extremely easy to gasify after absorbing heat, it is not suitable for heavy-loaded sliding bearings with high heat generation. However, refrigerant cooling can be used in some small-load compressors using sliding or rolling bearings. Summary of the invention

[0004] In order to improve the shortcomings of the prior art, the present invention provides a multi-channel bearing cooling component for cooling a bearing installed therein, and the multi-channel bearing cooling component is provided with:

[0005] A bearing installation cavity, used for installing a bearing;

[0006] A plurality of cooling medium inlets for introducing cooling medium into the interior thereof;

[0007] A plurality of liquid storage chambers are respectively and one by one fluidly connected to the plurality of cooling medium inlets to receive the introduced cooling medium, the plurality of liquid storage chambers are fluidly isolated from each other, and the plurality of liquid storage chambers are all fluidly connected to the bearing mounting chamber; and

[0008] The cooling medium outlet is in fluid communication with the bearing mounting cavity so that the cooling medium flows out of the multi-channel bearing cooling component.

[0009] In some embodiments, a plurality of cooling medium inlets and cooling medium outlets are evenly arranged in a circumferential direction of the multi-channel bearing cooling component.

[0010] In some embodiments, the plurality of cooling medium inlets are higher than the cooling medium outlets.

[0011] Another aspect of the present invention provides a compressor, comprising:

[0012] case;

[0013] A rotor is rotatably disposed in the housing via a bearing;

[0014] The aforementioned multi-channel bearing cooling component, the bearing is installed in the bearing installation cavity of the multi-channel bearing cooling component; and

[0015] The cooling medium supply source is used to supply cooling medium to the plurality of cooling medium inlets.

[0016] In some embodiments, a cooling medium supply source supplies cooling medium to a plurality of cooling medium inlets independently of one another.

[0017] In some embodiments, a valve is provided on the cooling flow path between at least one of the plurality of cooling medium inlets and the cooling medium supply source, for connecting or disconnecting the cooling flow path.

[0018] In some embodiments, the compressor includes a controller for controlling the opening or closing of the valve.

[0019] In some embodiments, the compressor includes a sensor for receiving the speed and power information of the motor of the compressor and / or calculating the magnitude and direction of the working load of the bearing, and is capable of connecting or disconnecting the valve.

[0020] In some embodiments, the compressor has at least one of the following working states:

[0021] When the compressor is in a light load state, a first number of valves are in an on state, and the remaining valves are in an off state, and the first number is less than the total number of valves;

[0022] When the compressor is in a medium load state, a second number of valves are in an on state, and the remaining valves are in an off state, wherein the second number is greater than the first number and less than the total number;

[0023] When the compressor is under heavy load, all valves are turned on.

[0024] In some embodiments, the heavy load state includes a full load or an overload state.

[0025] In some embodiments, the cooling medium includes refrigerant or lubricating oil.

[0026] In some embodiments, the compressor comprises a centrifugal compressor.

[0027] Another aspect of the present invention provides an air conditioning device, which includes the aforementioned compressor.

[0028] Another aspect of the present invention provides a method for operating the above compressor, comprising the following steps:

[0029] Determine whether the compressor is in one of the following states: light load state, medium load state, heavy load state;

[0030] When it is determined that the compressor is in a light load state, supplying cooling medium to a first number of cooling medium inlets and stopping supplying cooling medium to the remaining cooling medium inlets, the first number being less than the total number of cooling medium inlets;

[0031] When it is determined that the compressor is in a medium load state, supplying cooling medium to a second number of cooling medium inlets and stopping supplying cooling medium to the remaining cooling medium inlets, the second number being greater than the first number and less than the total number;

[0032] When it is determined that the compressor is in a heavy load state, the cooling medium is supplied to all the cooling medium inlets.

[0033] In some embodiments, valves on cooling channels between cooling medium supply sources and cooling medium inlets are connected or disconnected independently of each other, and the valves are used to connect or disconnect the cooling channels.

[0034] In some embodiments, the heavy load state includes a full load or an overload state.

[0035] In some embodiments, when it is determined that the compressor is in a light load or medium load state, the load direction on the bearing is determined; and

[0036] The cooling medium is supplied to the liquid storage chambers adjacent to the load direction among the plurality of liquid storage chambers, and the supply of the cooling medium to the liquid storage chambers away from the load direction among the plurality of liquid storage chambers is stopped.

[0037] According to the present invention, the defect of insufficient cooling amount of the bearing is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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:

[0039] Figure 1 A side view of one side of a multi-channel bearing cooling component of the present invention;

[0040] Figure 2 For along Figure 1 Cross-sectional view taken along midline AA;

[0041] Figure 3 A side view of the other side of the multi-channel bearing cooling component of the present invention;

[0042] Figure 4 For along Figure 3 Cross-sectional view taken along midline BB;

[0043] Figure 5A schematic diagram of the flow paths of a multi-channel bearing cooling component and a refrigerant supply source according to the present invention; DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments 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.

[0045] 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.

[0046] Figure 1 A multi-channel bearing cooling component 100 according to the present invention is shown, which comprises: a bearing mounting cavity 101 for mounting a bearing; and a plurality of cooling medium inlets 102 for introducing cooling medium into the bearing in the multi-channel bearing cooling component 101 .

[0047] Figure 2 Shown along Figure 1 In the cross-sectional view taken along line AA, the multi-channel bearing cooling component 100 is provided with a plurality of liquid storage cavities 103, and the plurality of liquid storage cavities 103 are respectively and one-to-one fluidically connected with a plurality of cooling medium inlets 102, and the plurality of liquid storage cavities 103 are fluidically isolated from each other, and the plurality of liquid storage cavities 103 are fluidically connected with the bearing mounting cavity 101, so that the cooling medium flows into the bearing mounting cavity 101 and into the gap between the bearing and the rotor to cool the bearing.

[0048] Figure 3 Another side view of the multi-channel bearing cooling component according to the present invention is shown, in which the sealing cover 121 seals the liquid storage chamber 103 in a sealed manner, and the sealing cover 121 is fixed to the multi-channel bearing cooling component 100 by bolts 131 .

[0049] Figure 4 Shown along Figure 3In the cross-sectional view taken along line BB in FIG. 1 , the cooling medium after cooling the bearing leaves the bearing mounting cavity 101 and leaves the multi-channel bearing cooling component through the cooling medium outlet 104. The cooling medium can be lubricating oil or refrigerant. The cooled lubricating oil will return to the oil pump and start the next cooling cycle after being cooled again by the heat exchanger, or the cooled and vaporized refrigerant will return to the evaporator and start the next cooling cycle after being condensed, thereby ensuring that the bearings of the centrifugal compressor are continuously cooled during operation, thereby improving the reliability of the continuous operation of the unit.

[0050] In some embodiments, Figure 1 As shown, a plurality of cooling medium inlets 102 and cooling medium outlets 104 are evenly arranged on the side surfaces of the multi-channel bearing cooling component in the circumferential direction thereof, so that cooling medium can be evenly provided to the bearing, which is beneficial to even cooling of the bearing.

[0051] In some embodiments, for example, the multi-channel bearing cooling component is disc-shaped, and three cooling medium inlets 102 and one cooling medium outlet 104 are circumferentially arranged on its side. The cooling medium outlet 104 is located at the lower part of the multi-channel bearing cooling component, and the three cooling medium inlets 1-2 are higher than the cooling medium outlet 104.

[0052] The present invention also provides a compressor, comprising: a housing; a rotor rotatably disposed in the housing through a bearing; a multi-channel bearing cooling component 100, wherein the bearing is mounted in a bearing mounting cavity 101 of the multi-channel bearing cooling component 100; and a cooling medium supply source 500 for supplying cooling medium to a plurality of cooling medium inlets 102. For ease of description, only a flow path diagram of the multi-channel bearing cooling component and the cooling medium supply source 500 is shown here.

[0053] Since the motor output power and rotor speed of compressors, such as centrifugal compressors, are different when they operate under different working conditions, the heat generated by the bearings will also be very different. When the compressor is operating under a small load, the motor power and speed are low, the bearing heat is small, and the required cooling capacity is also small. Too much cooling medium will cause waste. For example, when too much refrigerant is involved in cooling, it will affect the refrigeration efficiency of the centrifugal compressor; when the compressor is operating under a large load, the motor power and speed are very high, and sometimes even exceed the rated value. At this time, the heat generated by the bearing will be very large. Not only may the cooling capacity of a single cooling channel be insufficient, but also for a centrifugal compressor with a gear speed increaser, since the bearing load direction will also change with the working conditions, uneven cooling may also occur, resulting in overheating at the bearing load. Therefore, it is difficult for a single cooling channel to match the best working state. If the channel size is small, there will be an overheating problem under high load conditions; if the channel size is large, it will cause a waste of cooling capacity under small and medium load conditions; and when the channel size is medium, both situations may occur.

[0054] In the compressor of the present invention, a plurality of cooling channels are provided in the multi-channel bearing cooling component to cool the bearing. According to the working condition of the compressor, one or various combinations of the plurality of cooling channels are selected to cool the bearing.

[0055] In some embodiments, a valve is provided between the cooling channel between the cooling medium supply source 500 and at least one of the plurality of cooling medium inlets 102, and the valve is used to connect or disconnect the cooling channel. Further, a valve is provided in each cooling channel between each of the plurality of cooling medium inlets 102 and the cooling medium supply source 500, so that the fluid connection or disconnection of each cooling channel can be achieved independently of each other.

[0056] In some embodiments, the compressor includes a controller, which can send an on or off instruction to the valve according to the speed or power information of the motor as required by actual working conditions.

[0057] In some embodiments, the valves are provided with sensors that can receive the speed and power information of the motor, or calculate the size and direction of the working load of the bearing, and can turn the valve on or off.

[0058] like Figure 5 As shown, there are first cooling channels 201, second cooling channels 301 and third cooling channels 401 between the cooling medium supply source 500 and the plurality of cooling medium inlets 102. The first cooling channel 201 leads to the cooling medium inlet 102 at the top and is provided with a first valve 202, the second cooling channel 301 leads to the cooling medium inlet 102 at the left and is provided with a second valve 302, and the third cooling channel 401 leads to the cooling medium inlet 102 at the left and is provided with a third valve 402. These valves can receive on and off instructions from a controller. The cooling medium supply pump 500 can be in the form of a pump.

[0059] In some embodiments, the valves 202, 302 and 402 may be solenoid valves.

[0060] In some embodiments, Figure 5 As shown, in the centrifugal compressor of the present invention, the bearing cooling structure 100 can be in at least one of the following three working states:

[0061] First working state: When the centrifugal compressor is under a small load condition, the rotor speed and motor power in the motor bearing and the rotor 13 are small, and the bearing capacity of the bearing is also small. Under a small load, the controller or sensor keeps the second valve 302 and the third valve 402 normally closed to prevent too much liquid refrigerant from entering the bearing and affecting the refrigeration efficiency of the centrifugal compressor itself. After the cooling medium is pressurized by the cooling medium supply source 500, it passes through the first cooling channel 201 and the first valve 202, which is the only one that remains normally open under a small load, and then enters the first liquid storage chamber through the first cooling medium inlet. The cooling medium passing through the first liquid storage chamber will directly flow into the gap between the bearing and the rotor to lubricate the bearing, and the cooling medium after absorbing heat will flow back to the cooling medium supply source 500 through the cooling medium outlet 104 below.

[0062] The second working state: when the centrifugal compressor is under medium load conditions, the motor speed and power are basically in the middle value range, and the bearing capacity of the bearing is in the middle value range. Through the controller or sensor, the first valve 202 is opened and kept open, and the second valve 302 or the third valve 402 is opened according to the specific load direction; when the load direction of the bearing is the load direction 1 shown in the figure, the second valve 302 is opened and the third valve 402 is closed; and when the load direction is the load direction 2 shown in the figure, the third valve 402 is opened and the second valve 302 is closed. In this way, when the centrifugal compressor is under medium load, the first valve 202 and the second valve 302 are opened at the same time according to the different load directions, or the first valve 202 and the third valve 402 are opened at the same time to ensure that the cooling medium enters from the load side close to the bearing, avoid the problems of uneven cooling and local overheating of the load area caused by single-channel cooling, and ensure that the load area of ​​the bearing can be fully cooled. At this time, after the cooling medium is pressurized by the cooling medium supply source 500, it passes through the first cooling channel 201 and the first valve 202 that is kept normally open, and then enters the first liquid storage cavity through the first cooling medium inlet. At the same time, after passing through the second cooling channel 301 and the second valve 302, it enters the second liquid storage cavity through the second cooling medium inlet, or after passing through the third cooling channel 401 and the third valve 402, it enters the third liquid storage cavity through the third cooling medium inlet. The cooling medium passing through each liquid storage cavity will directly flow into the gap between the bearing and the rotor to lubricate the bearing, and the cooling medium after absorbing heat will flow back to the pump through the cooling medium outlet 17 below.

[0063] The third working state: When the centrifugal compressor works under high load conditions, the motor speed and motor power are basically near or above the rated value, and are in a full load or overload working state. The load on the bearing is very large, and the heat generated is very large and the heating speed is also very fast. At this time, the motor frequency and power information are fed back to each valve or controller, and the sensor or controller opens the first valve 202, the second valve 302, and the third valve 402. At this time, the bearing cooling flow is the largest to ensure that there is enough lubricating oil or liquid refrigerant to cool the bearing when the machine is running under high load, and to ensure the reliability of the bearing operation. In this state, all valves are always kept fully open, that is, the maximum cooling medium flow always enters the motor bearings and rotor 13 to lubricate the bearings.

[0064] The small load condition, medium load condition, and large load condition here are set by technicians in this field based on actual needs according to the type of compressor and specific working occasions.

[0065] In the present invention, the on-off control valve can be controlled according to the real-time power and speed information of the motor and the load condition of the compressor to form an adaptive adjustment, thereby ensuring that liquid refrigerant is not wasted under small load and there is sufficient cooling flow under large load, thereby meeting the cooling requirements of the bearings of the centrifugal compressor when operating under different working conditions and different speeds, and improving the reliability of the unit operation.

[0066] The present invention also provides an air conditioning device comprising the compressor.

[0067] In addition, the present invention also provides an operating method of the above compressor, comprising the following steps:

[0068] Determine whether the compressor is in one of the following states: light load state, medium load state, heavy load state;

[0069] When it is determined that the compressor is in a light load state, supplying cooling medium to a first number of cooling medium inlets 102 and stopping supplying cooling medium to the remaining cooling medium inlets 102, the first number being less than the total number of cooling medium;

[0070] When it is determined that the compressor is in a medium load state, supplying cooling medium to a second number of cooling medium inlets 102102, and stopping supplying cooling medium to the remaining cooling medium inlets 102, the second number being greater than the first number and less than the total number;

[0071] When it is determined that the compressor is in a heavy load state, the cooling medium is supplied to all the cooling medium inlets 102 .

[0072] In some embodiments, with the help of a controller or a sensor, valves on multiple cooling channels between the cooling medium supply source 500 and each cooling medium inlet 102 are independently connected or disconnected to achieve a combination of multiple numbers of cooling channels.

[0073] In some embodiments, the heavy load state includes a full load or an overload state.

[0074] When it is determined that the compressor is in a light load or medium load state, the load direction on the bearing is determined; the cooling medium is supplied to the liquid storage cavity 103 adjacent to the load direction, and the cooling medium is stopped from being supplied to the liquid storage cavity 103 away from the load direction. This improves the problem of uneven cooling of the bearing.

[0075] 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 the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A multi-channel bearing cooling component (100), used for cooling a bearing installed therein, characterized in that: The multi-channel bearing cooling component (100) is provided with: A bearing mounting cavity (101) for mounting the bearing; A plurality of cooling medium inlets (102) for introducing cooling medium into the interior thereof; a plurality of liquid storage chambers (103), each of which is fluidically connected to the plurality of cooling medium inlets (102) in a one-to-one correspondence to receive the introduced cooling medium; the plurality of liquid storage chambers (103) are fluidically isolated from each other; and the plurality of liquid storage chambers (103) are all fluidically connected to the bearing mounting chamber (101); and A cooling medium outlet (104) is fluidically connected to the bearing mounting cavity (101) so that the cooling medium flows out of the multi-channel bearing cooling component (100).

2. The multi-channel bearing cooling component (100) according to claim 1, wherein the plurality of cooling medium inlets (102) and the cooling medium outlets (104) are evenly arranged in a circumferential direction of the multi-channel bearing cooling component (100).

3. The multi-channel bearing cooling component (100) according to claim 1, characterized in that: The plurality of cooling medium inlets (102) are higher than the cooling medium outlet (104).

4. A compressor, comprising: case; A rotor rotatably disposed in the housing via a bearing; The multi-channel bearing cooling component (100) according to any one of claims 1 to 3, wherein the bearing is installed in the bearing installation cavity (101) of the multi-channel bearing cooling component (100); as well as A cooling medium supply source (500) is used to supply cooling medium to the plurality of cooling medium inlets (102).

5. The compressor according to claim 4, characterized in that The cooling medium supply source (500) supplies the cooling medium to the plurality of cooling medium inlets (102) independently of one another.

6. The compressor according to claim 4, characterized in that A valve is provided on the cooling flow path between at least one of the plurality of cooling medium inlets (102) and the cooling medium supply source (500) for connecting or disconnecting the cooling flow path.

7. The compressor according to claim 6, characterized in that A valve is provided on each cooling flow path between each of the plurality of cooling medium inlets (102) and the cooling medium supply source (500) for connecting or disconnecting the cooling flow path.

8. The compressor according to claim 6 or 7, characterized in that: The compressor includes a controller for controlling the valve to be turned on or off.

9. The compressor according to claim 6 or 7, characterized in that: The compressor comprises a sensor for receiving the speed and power information of the motor of the compressor and / or calculating the magnitude and direction of the working load of the bearing, and is capable of connecting or disconnecting the valve.

10. The compressor according to claim 7, characterized in that The compressor has at least one of the following working states: When the compressor is in a light load state, a first number of the valves are in an on state, and the remaining valves are in an off state, wherein the first number is less than the total number of the valves; When the compressor is in a medium load state, a second number of the valves are in an on state, and the remaining valves are in an off state, wherein the second number is greater than the first number and less than the total number; When the compressor is under a heavy load, all of the valves are turned on.

11. The compressor according to claim 10, characterized in that The heavy load state includes a full load state or an overload state.

12. The compressor according to claim 4, characterized in that The cooling medium includes refrigerant or lubricating oil.

13. The compressor according to claim 4, characterized in that The compressor comprises a centrifugal compressor.

14. An air conditioning device, comprising the compressor according to any one of claims 4 to 13.

15. A method for operating the compressor according to any one of claims 4 to 13, comprising the following steps: Determining whether the compressor is in one of the following states: a light load state, a medium load state, or a heavy load state; When it is determined that the compressor is in a light load state, supplying the cooling medium to a first number of the cooling medium inlets and stopping supplying the cooling medium to the remaining cooling medium inlets, the first number being less than the total number of the cooling medium inlets; When it is determined that the compressor is in a medium load state, supplying the cooling medium to a second number of the cooling medium inlets, and stopping supplying the cooling medium to the remaining cooling medium inlets, wherein the second number is greater than the first number and less than the total number; When it is determined that the compressor is in a heavy load state, the cooling medium is supplied to all of the cooling medium inlets.

16. The operating method according to claim 15, characterized in that: The valves on the cooling channels between the cooling medium supply source and the cooling medium inlets are opened or closed independently of each other, and the valves are used to open or close the cooling channels.

17. The operating method according to claim 15, characterized in that: The heavy load state includes a full load state or an overload state.

18. The operating method according to claim 15, characterized in that: When it is determined that the compressor is in a light load or medium load state, determining the load direction on the bearing; and The cooling medium is supplied to the liquid storage cavity (103) adjacent to the load direction among the plurality of liquid storage cavities (103), and the supply of the cooling medium to the liquid storage cavity (103) away from the load direction among the plurality of liquid storage cavities (103) is stopped.

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