Centrifugal air compressor and accessory thereof

Abstract

The invention relates to the technical field of bearings, in particular to a centrifugal air compressor and an accessory thereof, the centrifugal air compressor accessory comprises an inner ring, arc-shaped tiles, an adjusting assembly and two sliding blocks, the inner ring is arranged on a rotating shaft in a sleeving mode, and a closed first cavity filled with lubricating oil is formed between the inner ring and the rotating shaft; the arc-shaped tile block is movably connected with the inner ring and located in the first cavity, two grooves which are communicated with the first cavity and arranged in the circumferential direction of the inner ring are formed in the arc-shaped tile block, each sliding block is arranged in one groove in a sliding mode, and the sliding blocks can be close to or away from the first cavity when sliding in the grooves; the adjusting assembly is used for controlling the two sliding blocks to alternately slide in the corresponding grooves in the opposite directions. When the two sliding blocks slide alternately, one groove discharges lubricating oil outwards, the other groove pumps the lubricating oil inwards, the flowing speed of an oil film between the two grooves is increased, the relatively stable state of the oil film is broken, then a thermal boundary layer of the oil film is damaged, and conduction of heat of the lubricating oil is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, in particular to a centrifugal air compressor and accessories thereof. Background Art

[0002] In centrifugal air compressors, tilting pad bearings are a common type of oil-fed bearing due to their excellent stability and load-bearing capacity. These bearings utilize multiple tilting pads arranged circumferentially around the shaft, providing support and lubrication through the oil film formed between the pads and the rotor. However, with the increasing demand for equipment efficiency across various industries, increasing turbine efficiency by increasing rotor speeds has become a common trend. This practice directly leads to increased bearing metal temperatures. Consequently, bearing thermal performance has become a major limiting factor in the design of fluid-film journal bearings. Furthermore, tilting pad bearings are not fully suspended. While the oil film reduces contact between the pads and rotor, direct contact and friction between the rotor and pad surfaces during startup and shutdown can easily cause frictional wear, generating tiny metal debris. These debris are difficult to completely dissipate with the lubricant and tend to adhere to the pad and rotor surfaces, reducing the oil film thickness and further increasing friction between them. This creates a vicious cycle that reduces bearing stability, increases equipment maintenance costs, and increases the risk of failure. Summary of the Invention

[0003] Based on this, it is necessary to provide a centrifugal air compressor and its accessories to address the thermal performance limitations and friction debris problems of the tilting pad bearings in the current centrifugal air compressors.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A centrifugal air compressor accessory includes a tilting pad bearing for supporting a rotating shaft, the tilting pad bearing including an inner ring and arcuate pads, the inner ring being fixedly disposed and sleeved on the rotating shaft and rotatably connected to the rotating shaft, a first cavity sealed and filled with lubricating oil being provided between the inner ring and the rotating shaft, the inner ring being provided with a plurality of oil inlets and a plurality of oil outlets alternately disposed around a circumferential surface of the inner ring and communicating with the first cavity, a plurality of arcuate pads being provided, each arcuate pad being located between two adjacent oil inlets, and a plurality of arcuate pads being located in the first cavity, the outer arcuate surface of each arcuate pad being movably connected to the inner ring, a suction mechanism being provided on each arcuate pad, each suction mechanism including an adjustment assembly and two sliders, each arcuate pad being provided with two grooves communicating with the first cavity and arranged along the circumferential direction of the inner ring, each slider being slidably disposed in one of the grooves and spaced apart from the first cavity, the sliding directions of the two sliders in the grooves being parallel, and the sliders being able to slide closer to or further away from the first cavity in the grooves, and the adjustment assembly being used to control the two sliders to slide alternately in opposite directions in the corresponding grooves.

[0006] Preferably, the adjustment assembly includes a card block, a fixed rod, a sliding rod and a transmission member. A second cavity is provided inside the arc-shaped tile, and the second cavity is connected to the groove. The card block is slidably set on the arc-shaped tile, and the card block is located between two sliders on the corresponding arc-shaped tile. The card block can slide close to or away from one of the sliders; the fixed rod is rotatably set on the card block, and there are two sliding rods. One end of the two sliding rods is rotatably connected to a slider respectively, and the other end of each sliding rod is slidably set on the fixed rod, and the two sliding rods are located on both sides of the card block. The rotation of the fixed rod drives the two sliders to slide in opposite directions in the corresponding grooves through the sliding rod. The transmission member is used to adjust the distance between the card block and the two sliders in the circumferential direction of the inner ring.

[0007] Preferably, the transmission member includes two push plates and two connecting rods. The two push plates are arranged on the arc-shaped tile and are located in the second cavity to slide along the sliding direction of the slider. Each push plate can slide and abut against a slider. The two ends of each connecting rod are respectively rotatably connected to the block and one of the push plates, and the rotation axis of the connecting rod is parallel to the rotation axis of the fixed rod; a spacing is provided between the rotation axis of the connecting rod and the block and the rotation axis of the connecting rod and the push plate in the sliding direction of the push plate.

[0008] Preferably, a channel is provided in the arc-shaped tile, and two push plates are slidably arranged in the channel on a side away from the slider, and the channel has a certain degree of airtightness under the action of the two push plates.

[0009] Preferably, each arc-shaped tile includes two half-pieces, the two half-pieces are connected by bolts, and a receiving groove is provided on a side of the two half-pieces close to each other, and the two receiving grooves together form a second cavity.

[0010] Preferably, in the rotation direction of the rotating shaft, the side of the groove close to the inner arc surface of the arc-shaped pad is located in front of the side away from the inner arc surface of the arc-shaped pad, and the oil outlet between the two adjacent oil inlets is located in front of the two grooves.

[0011] Preferably, a surface of the slider facing the first cavity is a concave surface.

[0012] Preferably, an outer shell is sleeved on the inner ring, the inner ring and the outer shell are fixedly connected, and a third cavity for storing oil is provided between the inner ring and the outer shell.

[0013] Preferably, a plurality of fuel injection nozzles are provided on the inner ring, each fuel injection nozzle is located between two adjacent arc-shaped tiles and is connected to the oil inlet, and a plurality of fuel injection nozzles are arranged along the axial direction of the inner ring.

[0014] A centrifugal air compressor comprises the above-mentioned centrifugal air compressor accessory and a body, a rotating shaft is rotatably arranged on the body, and an inner ring is arranged on the body.

[0015] The beneficial effects of the present invention are as follows: the lubricating oil between the rotating shaft and the arc-shaped pad will form an oil film. When the rotating shaft rotates, it will drive the oil film to rotate, causing the oil film to generate centrifugal force. The lubricating oil with centrifugal force will flow into the groove and can push the slider in the groove away from the first cavity. The centrifugal force of the lubricating oil entering the groove gradually disappears, the speed gradually decreases, and the impurities in the lubricating oil in the groove will gradually gather. An adjustment component is provided, and when the slider in one groove moves away from the first cavity and then approaches the first cavity, part of the lubricating oil in the groove will return to the first cavity, leaving behind precipitated impurities. When the two sliders slide alternately, one groove discharges lubricating oil outward, and the other groove draws lubricating oil inward, which increases the flow speed of the oil film between the two grooves to a certain extent, breaks the relatively stable state of the oil film, and then destroys the thermal boundary layer of the oil film, which is beneficial to the conduction of heat from the lubricating oil and improves the heat dissipation efficiency of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a centrifugal air compressor provided by an embodiment of the present invention;

[0017] Figure 2 A right side view of a centrifugal air compressor provided by an embodiment of the present invention;

[0018] Figure 3 for Figure 2 Cross-sectional view along the AA axis;

[0019] Figure 4 A schematic structural diagram of a centrifugal air compressor accessory provided by an embodiment of the present invention;

[0020] Figure 5 A top view of a centrifugal air compressor accessory provided by an embodiment of the present invention;

[0021] Figure 6 for Figure 5 Cross-sectional view along the BB direction;

[0022] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0023] Figure 8 for Figure 7 Enlarged view of point D in the middle;

[0024] Figure 9 A front view of a centrifugal air compressor accessory provided by an embodiment of the present invention;

[0025] Figure 10 for Figure 9 Cross-sectional view along the EE direction;

[0026] Figure 11A schematic structural diagram of a curved tile of a centrifugal air compressor accessory provided by an embodiment of the present invention.

[0027] Among them: 100, inner ring; 101, rotating shaft; 102, arc-shaped tile; 103, oil inlet; 104, oil outlet; 110, slider; 111, groove; 112, block; 113, fixed rod; 114, sliding rod; 115, second cavity; 116, push plate; 117, connecting rod; 121, arc groove; 122, first spring; 123, positioning ball; 124, channel; 130, pillar; 131, second spring; 132, outer shell; 133, third cavity; 134, fuel injector; 135, body. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are 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 cannot be understood as limiting the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] like Figures 4 to 11As shown, an embodiment of the present invention provides a centrifugal air compressor accessory, including a tilting pad bearing for supporting a rotating shaft 101, the tilting pad bearing including an inner ring 100 and an arc-shaped pad 102, the inner ring 100 is fixedly arranged, the inner ring 100 is sleeved on the rotating shaft 101 and is rotatably connected to the rotating shaft 101, and a first cavity that is sealed and filled with lubricating oil is provided between the inner ring 100 and the rotating shaft 101; the inner ring 100 is provided with a plurality of oil inlets 103 and a plurality of oil outlets 104 that are alternately arranged around the circumference of the inner ring 100 and communicated with the first cavity, and a plurality of arc-shaped pads 102 are provided, each arc-shaped pad 102 is located between two adjacent oil inlets 103 and a plurality of arc-shaped pads 102 are provided. 102 is located in the first cavity, and the outer arc surface of each arc-shaped tile 102 is movably connected to the inner ring 100; each arc-shaped tile 102 is provided with a suction mechanism, and each suction mechanism includes an adjustment component and two sliders 110, and each arc-shaped tile 102 is provided with two grooves 111 that are connected to the first cavity and arranged along the circumferential direction of the inner ring 100, and each slider 110 is slidably set in a groove 111 and is spaced apart from the first cavity, and the sliding directions of the two sliders 110 in the groove 111 are parallel, and the sliders 110 can slide close to or away from the first cavity in the groove 111; the adjustment component is used to control the two sliders 110 to slide alternately in opposite directions in the corresponding grooves 111.

[0032] The lubricating oil between the rotating shaft 101 and the arc-shaped pad 102 forms an oil film. Rotation of the rotating shaft 101 drives the oil film, generating centrifugal force. This centrifugal force causes the lubricating oil to flow into the groove 111, pushing the slider 110 in the groove 111 away from the first cavity. The centrifugal force on the lubricating oil entering the groove 111 gradually dissipates, causing the speed to decrease, and impurities in the lubricating oil in the groove 111 to gradually accumulate. An adjustment assembly is provided. When the slider 110 in one groove 111 moves away from the first cavity and then approaches it again, some of the lubricating oil in the groove 111 returns to the first cavity, leaving behind precipitated impurities. When the two sliders 110 slide alternately, one groove 111 discharges lubricating oil while the other groove 111 draws lubricating oil inward. This increases the flow velocity of the oil film between the two grooves 111 to a certain extent, disrupting the relatively stable state of the oil film and further destroying the thermal boundary layer of the oil film, facilitating heat transfer from the lubricating oil and improving its heat dissipation efficiency.

[0033] In this embodiment, the adjustment assembly includes a block 112, a fixed rod 113, a sliding rod 114 and a transmission member. A second cavity 115 is provided inside the arc-shaped tile 102, and the second cavity 115 is communicated with the groove 111. The block 112 is slidably set on the arc-shaped tile 102, and the block 112 is located between the two sliders 110 on the corresponding arc-shaped tile 102. The block 112 can slide close to or away from one of the sliders 110; the middle part of the fixed rod 113 is rotatably set on the block 112, and the rotation axis of the fixed rod 113 extends along the axial direction of the inner ring 100. There are two sliding rods 114, and one end of the two sliding rods 114 is rotatably connected to a slider 110 respectively. The sliding rods 114 and the sliders The rotation axis of 110 is parallel to the rotation axis of the fixed rod 113, and both ends of the fixed rod 113 are provided with sliding grooves. The other end of each sliding rod 114 is slidably set in a sliding groove on the fixed rod 113, and the two sliding rods 114 are located on both sides of the block 112. The two sliders 110 are connected through the fixed rod 113 and the two sliding rods 114. The fixed rod 113 rotates through the sliding rod 114 to drive the two sliders 110 to slide in the corresponding grooves 111 in opposite directions. The connection position of the fixed rod 113 and the block 112 is set as the first fulcrum, and the connection position of the sliding rod 114 and the slider 110 is set as the second fulcrum. As the fixed rod 113 rotates, the distance between the two second fulcrums and the first fulcrum will change.

[0034] The transmission member is used to adjust the distance between the block 112 and the two sliders 110 in the circumferential direction of the inner ring 100. When the oil film rotates and generates centrifugal force, the oil film will generate a thrust on the slider 110 away from the first cavity. At this time, the distance between the block 112 and one of the sliders 110 is controlled by the transmission member to be greater than the distance between the block 112 and the other slider 110. The distance between the first fulcrum and the two second fulcrums is not equal, and the two sliders 110 are subjected to different thrusts from the oil film. The two sliders 110 slide in opposite directions in the corresponding grooves 111 under the connection action of the fixed rod 113 and the two sliding rods 114.

[0035] In this embodiment, the transmission member includes two push plates 116 and two connecting rods 117. The two push plates 116 are slidably arranged on the arc-shaped tile 102 along the sliding direction of the slider 110 and are located in the second cavity 115. The two connecting rods 117 are located on both sides of the clamping block 112 in the circumferential direction of the inner ring 100. The two push plates 116 are also located on both sides of the clamping block 112 in the circumferential direction of the inner ring 100. Each push plate 116 can slide and abut against a slider 110. The two ends of each connecting rod 117 are respectively connected to the clamping block 112. The block 112 is rotatably connected to one of the push plates 116, and the rotation axis of the connecting rod 117 is parallel to the rotation axis of the fixed rod 113; a distance is provided between the rotation axis of the connecting rod 117 and the block 112 and the rotation axis of the connecting rod 117 and the push plate 116 in the sliding direction of the push plate 116. When the block 112 slides, a component force can be applied to the corresponding push plate 116 through the two connecting rods 117, so that the two push plates 116 slide along the sliding direction of the slider 110 with the corresponding slider 110.

[0036] Two arc grooves 121 are provided on one side of the arc tile 102 that is slidably connected to the clamping block 112. The two arc grooves 121 are respectively connected to the second cavity 115 and are arranged along the sliding direction of the clamping block 112. A mounting groove is provided on the clamping block 112, and a first spring 122 and a positioning ball 123 are provided in the mounting groove. The first spring 122 can be extended and retracted in the direction close to the arc groove 121 in the mounting groove. The positioning ball 123 is slidably arranged in the mounting groove and is located on the side of the first spring 122 close to the arc groove 121. The extension and retraction of the first spring 122 can make the positioning ball 123 slide in the arc groove 121. As the oil film pushes one of the sliders 110 away from the first cavity due to centrifugal force, the distance between the first fulcrum and the two second fulcrums gradually becomes uniform. When the distance between the first fulcrum and the two second fulcrums is uniform, the positioning ball 123 is located in the middle of the two arc grooves 121. The centrifugal force of the oil film also pushes the two sliders 110 uniformly, and the sliders 110 continue to slide a certain distance in the previous direction due to their own inertia. During this process, the slider 110 continues to push the push plate 116, which in turn drives the block 112 to slide via the connecting rod 117, causing the positioning ball 123 to slide into the corresponding arc groove 121. At this time, the positioning ball 123, guided by the first spring 122 and the arc surface of the arc groove 121, drives the push plate 116 to slide via the connecting rod 117. The distance between the first fulcrum and the two second fulcrums may also become unequal. In this case, the oil film, under the action of centrifugal force, will push the other slider 110 away from the first cavity.

[0037] In this embodiment, a channel 124 is provided in the arc-shaped tile 102, and two push plates 116 are slidably set in the channel 124 on the side away from the slider 110. The channel 124 has a certain degree of airtightness under the action of the two push plates 116. The inside of the channel 124 can be filled with a medium with good fluidity such as gas or liquid. During the sliding of the block 112, the sliding directions of the two push plates 116 in the channel 124 are opposite. The push plate 116 approaching the channel 124 will assist the other push plate 116 to slide in the direction away from the channel 124 under the action of the medium in the channel 124, thereby improving the smoothness of the movement of the push plate 116.

[0038] In this embodiment, each arc-shaped tile 102 includes two halves, which are connected by bolts and a sealing strip is provided between the two halves. A receiving groove is provided on the side of the two halves that are close to each other, and the two receiving grooves together form a second cavity 115, which facilitates the processing of the first cavity and the installation of the adjustment component.

[0039] The inner ring 100 is equipped with multiple struts 130, with a gasket placed between each strut 130 and the inner ring 100. Each arcuate pad 102 is connected to the inner ring 100 via a strut 130. One end of the strut 130 has a spherical surface, and the arcuate pad 102 contacts one end of the spherical surface of the strut 130. A gap is provided between the inner ring 100 and the arcuate pad 102. The arcuate pad 102 can automatically adjust the thickness of the oil film between itself and the rotating shaft 101.

[0040] Two second springs 131 are further provided between each arc-shaped pad 102 and the inner ring 100 . The two second springs 131 are located on both sides of the support 130 in the circumferential direction of the inner ring 100 and are used to provide auxiliary support for the arc-shaped pad 102 .

[0041] In this embodiment, in the rotational direction of the rotating shaft 101, the side of the groove 111 closest to the inner curved surface of the arcuate pad 102 is located in front of the side away from the inner curved surface of the arcuate pad 102. The arcuate pad 102 is provided with a through hole that penetrates the arcuate pad 102 and connects to the oil outlet 104 and the first cavity, respectively. The direction of the lubricating oil pushed out of the groove 111 by the slider 110 is to some extent along the direction of rotation of the oil film, thereby promoting the rotation of the oil film. The oil outlet 104 between two adjacent oil inlets 103 is located in front of the two grooves 111. The lubricating oil entering from the oil inlet 103 is discharged after passing through the two grooves 111, which enables the oil film to rotate more effectively, thereby providing centrifugal force to promote the sliding of the slider 110.

[0042] In this embodiment, the surface of the slider 110 facing the first cavity is concave. This concave surface can keep impurities in the lubricating oil in the chute away from the sliding friction surface between the slider 110 and the arc-shaped pad 102, thereby preventing wear of the sliding friction surface between the slider 110 and the arc-shaped pad 102 when the slider 110 slides on the arc-shaped pad 102. The concave surface includes a lowest point and inclined surfaces surrounding the lowest point. In the rotation direction of the rotating shaft 101, the area of ​​the inclined surface behind the lowest point of the concave surface is larger than the area of ​​the inclined surface in front of the lowest point of the concave surface, which can promote the extruded liquid to flow further in the desired direction.

[0043] In this embodiment, a housing 132 is sleeved over the inner ring 100. The inner ring 100 and the housing 132 are fixedly connected, and a third cavity 133 for storing oil is defined between the inner ring 100 and the housing 132. An oil tank is located outside the housing 132. Each oil inlet 103 is connected to the tank via an oil pipe. The oil outlet 104 is connected to the third cavity 133, which is also connected to the tank via an oil pipe. An oil pump is located within the tank to pump lubricating oil to the oil inlet 103.

[0044] In another embodiment, a partition is provided in the third cavity 133, which divides the third cavity 133 into two independent chambers, multiple oil inlets 103 are connected to one of the chambers, and multiple oil outlets 104 are connected to the other chamber, and the two chambers are connected to the oil tank through oil pipes respectively.

[0045] In this embodiment, the inner ring 100 is provided with a plurality of oil nozzles 134. Each oil nozzle 134 is located between two adjacent arc-shaped pads 102 and communicates with the oil inlet 103. The oil nozzle 134 is provided with a plurality of oil nozzles arranged along the axial direction of the inner ring 100. The lubricating oil entering the first cavity through the oil nozzles 134 can be more evenly distributed in the axial direction of the inner ring 100.

[0046] like Figures 1 to 3 As shown, a centrifugal air compressor provided by an embodiment of the present invention includes a centrifugal air compressor accessory in the above embodiment, and also includes a body 135, a rotating shaft 101 is rotatably set on the body 135, and an inner ring 100 is set on the body 135 through an outer shell 132.

[0047] The working principle of a centrifugal air compressor and its accessories provided in the above embodiment is as follows:

[0048] First, multiple oil pumps are started to inject lubricating oil into the first cavity. The excess lubricating oil in the first cavity is discharged from the oil outlet 104 to the third cavity 133. The lubricating oil in the third cavity 133 enters the oil tank through the oil pipe connected to the oil tank, and then rotates the rotating shaft 101.

[0049] As the rotating shaft 101 rotates, the oil film gradually rotates with it. The rotating oil film generates centrifugal force, which enters the groove 111 and applies thrust to the slider 110 in the groove 111. Taking one of the arc-shaped pads 102 as an example, in the initial position, the distances between the two second fulcrums and the first fulcrum are inconsistent. After the oil film with centrifugal force applies the same force to the two sliders 110, the slider 110 corresponding to the second fulcrum farther from the first fulcrum will be pushed away from the first cavity by the oil film. The slider 110 drives the fixed rod 113 to rotate on the clamping block 112 via the sliding rod 114 rotatably connected thereto. The rotating fixed rod 113 drives the other slider 110 to slide in the corresponding groove 111 and approach the first cavity via the other sliding rod 114. The slider 110 close to the first cavity pushes the lubricating oil in the corresponding groove 111 into the oil film along the direction of rotation of the oil film, while the slider 110 far away from the first cavity is more likely to draw the lubricating oil in the oil film between the two sliders 110 into the corresponding groove 111, thereby changing the flow speed of the oil film between the two sliders 110 and breaking its motion state.

[0050] When the slider 110 moves away from the first cavity, the slider 110 will also push the push plate 116 in contact with it to slide synchronously. The sliding of the push plate 116 drives the connecting rod 117 to rotate around the block 112. At the same time, when the push plate 116 moves away from the block 112, the block 112 will be pulled to slide by the connecting rod 117. The block 112 slides toward the slider 110 away from the first cavity. At the same time, the block 112 drives the positioning ball 123 to gradually slide out of the corresponding arc groove 121, and the distances between the two second fulcrums and the first fulcrum gradually become consistent. When the positioning ball 123 slides out of the arc groove 121, the distances between the two second fulcrums and the first fulcrum are the same. At this time, the slider 110 still has a certain speed. The slider 110 away from the first cavity continues to drive the corresponding push plate 116 to slide, and the push plate 116 still drives the block 112 to slide through the connecting rod 117. The sliding of the block 112 drives the positioning ball 123 to slide into another arc groove 121. The positioning ball 123 that enters the arc groove 121 again is guided by the arc groove 121 and the elastic force of the first spring 122. The positioning ball 123 drives the block 112 to slide and pushes the push plate 116 to slide through the connecting rod 117. The distances from the two second fulcrums to the first fulcrum are unequal again. The corresponding sliders 110 are subjected to unequal forces from the oil film with centrifugal force, and the two sliders 110 can slide in the opposite direction again.

[0051] The two sliders 110 slide back and forth alternately, which not only promotes the flow of the oil film between the two grooves 111 , but also breaks the stable state of the oil film between the two grooves 111 .

[0052] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A centrifugal air compressor accessory comprising a tilting pad bearing for supporting a rotating shaft, characterized in that: The tilting pad bearing includes an inner ring and an arc-shaped pad. The inner ring is fixed, sleeved on the rotating shaft and rotatably connected to the rotating shaft. A first cavity that is sealed and filled with lubricating oil is provided between the inner ring and the rotating shaft; the inner ring is provided with a plurality of oil inlets and a plurality of oil outlets that are alternately arranged around the circumference of the inner ring and connected to the first cavity. There are multiple arc-shaped pads, each arc-shaped pad is located between two adjacent oil inlets, and multiple arc-shaped pads are located in the first cavity. The outer arc surface of each arc-shaped pad is movably connected to the inner ring; each arc-shaped pad is provided with a suction mechanism, and each suction mechanism includes an adjustment component and two sliders. Each arc-shaped pad is provided with two grooves that are connected to the first cavity and arranged along the circumferential direction of the inner ring. Each slider is slidably set in a groove and is spaced apart from the first cavity. The sliding directions of the two sliders in the grooves are parallel, and the sliders can slide close to or away from the first cavity in the grooves; the adjustment component is used to control the two sliders to slide alternately in opposite directions in the corresponding grooves.

2. A centrifugal air compressor accessory according to claim 1, characterized in that: The adjusting assembly includes a card block, a fixed rod, a sliding rod and a transmission member. A second cavity is provided inside the arc-shaped tile, and the second cavity is connected to the groove. The card block is slidably set on the arc-shaped tile. The card block is located between the two sliders on the corresponding arc-shaped tile. The card block can slide close to or away from one of the sliders; the fixed rod is rotatably set on the card block, and there are two sliding rods. One end of the two sliding rods is rotatably connected to a slider respectively, and the other end of each sliding rod is slidably set on the fixed rod, and the two sliding rods are located on both sides of the card block. The fixed rod rotates through the sliding rod to drive the two sliders to slide in opposite directions in the corresponding grooves. The transmission member is used to adjust the distance between the card block and the two sliders in the circumferential direction of the inner ring.

3. A centrifugal air compressor accessory according to claim 2, characterized in that: The transmission part includes two push plates and two connecting rods. The two push plates are arranged on the arc-shaped tile and are located in the second cavity along the sliding direction of the slider. Each push plate can slide and abut against a slider. The two ends of each connecting rod are respectively rotatably connected to the block and one of the push plates, and the rotation axis of the connecting rod is parallel to the rotation axis of the fixed rod; a distance is provided between the rotation axis of the connecting rod and the block and the rotation axis of the connecting rod and the push plate in the sliding direction of the push plate.

4. A centrifugal air compressor accessory according to claim 3, characterized in that: A channel is provided in the arc-shaped tile, and two push plates are slidably arranged in the channel at a side away from the slider. The channel has a certain degree of sealing under the action of the two push plates.

5. The centrifugal air compressor accessory according to claim 3, characterized in that: Each arc-shaped tile comprises two half-pieces, which are connected by bolts. A receiving groove is provided on one side of the two half-pieces close to each other, and the two receiving grooves together form a second cavity.

6. The centrifugal air compressor accessory according to claim 1, characterized in that: In the rotation direction of the rotating shaft, the side of the groove close to the inner arc surface of the arc-shaped pad is located in front of the side away from the inner arc surface of the arc-shaped pad, and the oil outlet between the two adjacent oil inlets is located in front of the two grooves.

7. The centrifugal air compressor accessory according to claim 1, characterized in that: A surface of the slider facing the first cavity is a concave surface.

8. The centrifugal air compressor accessory according to claim 1, characterized in that: An outer shell is sleeved on the inner ring, the inner ring and the outer shell are fixedly connected, and a third cavity for storing oil is provided between the inner ring and the outer shell.

9. The centrifugal air compressor accessory according to claim 1, characterized in that: The inner ring is provided with a plurality of oil spray nozzles, each of which is located between two adjacent arc-shaped tiles and is connected to the oil inlet. The oil spray nozzle is provided with a plurality of oil spray nozzles arranged along the axial direction of the inner ring.

10. A centrifugal air compressor, characterized in that: The centrifugal air compressor accessory comprises the accessory according to any one of claims 1 to 9, further comprising a body, a rotating shaft rotatably arranged on the body, and an inner ring arranged on the body.

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