Bearing lubricating system and compressor

Abstract

The bearing lubricating system comprises a high-speed thrust bearing, a non-high-speed thrust bearing, an oil tank and an oil pump, the input end of the oil pump is connected to the oil tank, and the output end of the oil pump is connected to the high-speed thrust bearing and the non-high-speed thrust bearing. The high-speed thrust bearing is connected to the output end of the oil pump through a one-way valve, and the non-high-speed thrust bearing is connected to the oil tank. According to the bearing lubricating system, the oil return hole of the high-speed thrust bearing is directly connected to the output end of the oil pump through the one-way valve, pumping energy of the high-speed thrust bearing is recycled, meanwhile, high-pressure lubricating oil is prevented from directly entering the oil tank to impact the liquid level of the oil tank to form oil mist, and therefore the design difficulty and cost of an oil separator are reduced. The bearing lubricating system can be effectively applied to the compressor, and the working stability of the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a bearing lubrication system and a compressor. Background Art

[0002] Rotating machinery using sliding bearings typically uses a speed-increasing gear pair to increase the impeller's operating speed, or employs a high-speed direct-drive mechanism. Therefore, the equipment's operating shaft typically consists of a low-speed motor shaft and a high-speed impeller shaft. The corresponding sliding bearings include low-speed radial bearings, low-speed thrust bearings, high-speed radial bearings, and high-speed thrust bearings. During operation, these bearings require lubrication and cooling via a lubricating oil cooling circulation system consisting of an oil pump, oil tank, oil cooler, and piping.

[0003] In the prior art, the oil lubrication circuit of the bearing is usually as follows Figure 1 As shown, lubricating oil is delivered to each bearing through an oil pump and the oil circuits of each bearing for lubrication and cooling. After lubrication, it returns to the oil tank through its own pipeline and then circulates through the oil pump. However, in high-speed rotating machinery, the lubricating oil flowing through high-speed thrust bearings has high pressure energy due to the "pumping" action. If it is returned directly to the oil tank, this high-pressure energy is wasted. The oil flow required for the bearing lubrication cycle is entirely provided by the oil pump, which will result in a larger oil pump size and high power consumption. On the other hand, when the high-pressure lubricating oil is returned directly to the oil tank, the "spraying" effect easily forms oil mist inside the tank. This increases the load on the oil separator, easily creating the risk of oil starvation in the lubrication system, and may increase the design difficulty and cost of the oil separation system. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a bearing lubrication system and a compressor to solve the technical problem that the "pumping" effect of the lubricating oil by the high-speed thrust bearing causes the lubricating oil to impact the liquid level of the oil tank during oil return, thereby forming oil mist, thereby affecting the stability of the bearing lubrication system.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a bearing lubrication system, comprising an oil tank, an oil pump, a high-speed thrust bearing and a non-high-speed thrust bearing, wherein the input end of the oil pump is connected to the oil tank, and the output end of the oil pump is connected to the high-speed thrust bearing and the non-high-speed thrust bearing respectively, the high-speed thrust bearing is connected to the output end of the oil pump via a one-way valve, and the non-high-speed thrust bearing is connected to the oil tank.

[0007] Optionally, the non-high-speed thrust bearing is a high-speed radial bearing, a low-speed thrust bearing or a low-speed radial bearing.

[0008] Optionally, if the number of the non-high-speed thrust bearings is two or more, the non-high-speed thrust bearings are connected in parallel.

[0009] Optionally, the output end of the oil pump is further connected to an oil filter and an oil cooler connected in series, and the oil filter is arranged at the front end or the rear end of the oil cooler.

[0010] Optionally, the high-speed thrust bearing includes a bearing seat, in which a first stationary thrust plate, a high-speed rotating plate and a second stationary thrust plate are coaxially spaced apart, a high-speed shaft is fastened to the middle of the high-speed rotating plate, and the high-speed shaft extends along the axis through the first stationary thrust plate and the bearing seat to the outside of the bearing seat; the oil supply hole of the high-speed thrust bearing is arranged in the gap between the inner side of the first stationary thrust plate and the high-speed rotating plate, and the oil return hole of the high-speed thrust bearing is arranged in the gap between the bearing seat and the outside of the high-speed rotating plate.

[0011] In a second aspect, the present invention provides a compressor, comprising the bearing lubrication system as described above.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model provides a bearing lubrication system and compressor. In the bearing lubrication system, by directly connecting the oil return hole of a high-speed thrust bearing via a one-way valve to the output of an oil pump, the "pumping" energy of the high-speed thrust bearing is recovered. This prevents high-pressure lubricating oil from directly entering the oil tank, impacting the tank liquid level and forming oil mist, thereby reducing the design complexity and cost of the oil separator. This bearing lubrication system can be effectively applied to compressors, improving their operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This utility model provides a circuit diagram of an existing bearing lubrication system;

[0015] Figure 2 1 is a circuit diagram of a bearing lubrication system provided by an embodiment of the present invention;

[0016] Figure 3 This is a schematic structural diagram of a high-speed thrust bearing provided by an embodiment of the present utility model;

[0017] The following are marked in the figure:

[0018] 1. High-speed thrust bearing; 11. Bearing seat; 12. First stationary thrust plate; 13. High-speed rotating plate; 14. Second stationary thrust plate; 15. High-speed shaft; 2. Non-high-speed thrust bearing; 3. Oil tank; 4. Oil pump; 5. Check valve; 6. Oil filter; 7. Oil cooler. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] Example 1:

[0023] like Figure 2 As shown, an embodiment of the utility model provides a bearing lubrication system, including a high-speed thrust bearing 1, a non-high-speed thrust bearing 2, an oil tank 3 and an oil pump 4, the input end of the oil pump 4 is connected to the oil tank 3, and the output end of the oil pump 4 is respectively connected to the high-speed thrust bearing 1 and the non-high-speed thrust bearing 2, the high-speed thrust bearing 1 is connected to the output end of the oil pump 4 via a one-way valve 5, and the non-high-speed thrust bearing 2 is connected to the oil tank 3.

[0024] Specifically, in this embodiment, the non-high-speed thrust bearing is a high-speed radial bearing, a low-speed thrust bearing, or a low-speed radial bearing. In other optional embodiments, other types of bearings may also be used in rotating machinery using sliding bearings. If two or more non-high-speed thrust bearings are provided, the non-high-speed thrust bearings are connected in parallel and lubricated with lubricating oil.

[0025] Specifically in this embodiment, the output end of the oil pump 4 is connected in sequence to an oil filter 6 and an oil cooler 7. The lubricating oil at the output end of the oil pump 4 is filtered and cooled before entering the high-speed thrust bearing 1 and the non-high-speed thrust bearing 2, respectively, through the oil circuit to lubricate the high-speed thrust bearing 1 and the non-high-speed thrust bearing 2. The oil filter 6 is used to filter impurities and particulate matter from the lubricating oil to ensure the cleanliness of the lubricating oil and the normal operation of the system. Various types are available, including mesh filters, sheet filters, wire gap filters, and magnetic filters. The oil cooler 7 is used to cool the lubricating oil to control the temperature of the oil entering the bearings and other components. Through the principle of heat exchange, the heat in the lubricating oil is transferred to a cooling medium (such as water or air), thereby reducing the lubricating oil temperature. In other optional embodiments, the order of the oil filter 6 and the oil cooler 7 can be reversed, and the functions remain the same.

[0026] like Figure 3 As shown, the high-speed thrust bearing 1 includes a bearing seat 11, in which a first stationary thrust plate 12, a high-speed rotating plate 13 and a second stationary thrust plate 14 are coaxially spaced apart. A high-speed shaft 15 is fastened to the middle of the high-speed rotating plate 13, and the high-speed shaft 15 extends along the axis through the first stationary thrust plate 12 and the bearing seat 11 to the outside of the bearing seat 11; the oil supply hole of the high-speed thrust bearing 1 is arranged in the gap between the inner side of the first stationary thrust plate 12 and the high-speed rotating plate 13, and the oil return hole of the high-speed thrust bearing 1 is arranged in the gap between the bearing seat 11 and the outer side of the high-speed rotating plate 13.

[0027] In operation, lubricating oil enters the gap between the first stationary thrust plate 12 and the high-speed rotating plate 13 from the oil supply port of the high-speed thrust bearing 1. The lubricating oil is compressed to provide bearing support. At the same time, the high-speed rotating plate 13 generates a "pumping" ability when rotating at high speed, causing this part of the lubricating oil to generate high-pressure energy. It then flows from the bearing gap to the cavity of the bearing seat 11 and is collected. It is discharged through the oil return hole of the high-speed thrust bearing 1, and then passes through the external oil pipe and the one-way valve 5 to the output end of the oil pump 4. Together with the high-pressure lubricating oil at the output end of the oil pump 4, it passes through the oil filter 6 and the oil cooler 7 before being re-delivered to the high-speed thrust bearing 1 and the non-high-speed thrust bearing 2. The one-way valve 5 prevents the high-pressure lubricating oil at the outlet of the oil pump 4 from flowing into the high-speed thrust bearing 1.

[0028] Example 2:

[0029] An embodiment of the present invention provides a compressor, which includes the bearing lubrication system provided in the above-mentioned embodiment 1.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bearing lubrication system, characterized in that: It includes an oil tank, an oil pump, a high-speed thrust bearing and a non-high-speed thrust bearing. The input end of the oil pump is connected to the oil tank, and the output end of the oil pump is connected to the high-speed thrust bearing and the non-high-speed thrust bearing respectively. The high-speed thrust bearing is connected to the output end of the oil pump via a one-way valve, and the non-high-speed thrust bearing is connected to the oil tank.

2. The bearing lubrication system according to claim 1, characterized in that: The non-high-speed thrust bearing is a high-speed radial bearing, a low-speed thrust bearing or a low-speed radial bearing.

3. The bearing lubrication system according to claim 1, characterized in that: If there are two or more non-high-speed thrust bearings, the non-high-speed thrust bearings are connected in parallel.

4. The bearing lubrication system according to claim 1, characterized in that: The output end of the oil pump is also connected to an oil filter and an oil cooler in series.

5. The bearing lubrication system according to claim 1, characterized in that: The high-speed thrust bearing includes a bearing seat, in which a first stationary thrust plate, a high-speed rotating plate and a second stationary thrust plate are coaxially spaced apart. A high-speed shaft is fastened to the middle of the high-speed rotating plate, and the high-speed shaft extends along the axis through the first stationary thrust plate and the bearing seat to the outside of the bearing seat; the oil supply hole of the high-speed thrust bearing is arranged in the gap between the inner side of the first stationary thrust plate and the high-speed rotating plate, and the oil return hole of the high-speed thrust bearing is arranged in the gap between the bearing seat and the outer side of the high-speed rotating plate.

6. A compressor, characterized in that: The compressor comprises a bearing lubrication system according to any one of claims 1 to 5.

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