Air compressor rotor

Abstract

The utility model relates to the field of air compressors, in particular to an air compressor rotor which comprises a rotating shaft, a threaded protrusion, an oil inlet, an oil inlet channel, an oil outlet channel and an oil outlet, the threaded protrusion is fixedly arranged on the outer surface of the rotating shaft in a spiral shape, the oil inlet channel is arranged in the rotating shaft, the oil inlet channel is an annular channel, and the oil outlet channel is an annular channel. The oil inlet channel is arranged in the rotating shaft, the axis of the oil inlet channel is consistent with the axis of the rotating shaft, the oil outlet channel is arranged in the rotating shaft and is arranged in the axis direction of the rotating shaft, the oil inlet channel and the oil outlet channel are communicated on one side, the oil inlet is communicated with the oil inlet channel, and the oil outlet is communicated with the oil outlet channel. When the rotor works, normal-temperature heat conduction oil is conveyed to the oil inlet channel through the oil inlet, the rotating shaft is cooled from the inside, then the normal-temperature heat conduction oil enters the oil outlet channel from the other end of the oil inlet channel, and the heated heat conduction oil flows out of the oil outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to an air compressor rotor. Background Art

[0002] The screw compressor is a rotary positive displacement compressor, in which two rotors with helical gears mesh with each other, so that the volume of the two rotors meshing becomes smaller, thereby compressing and discharging the gas. When a traditional screw air compressor is working, the temperature of the gas will rise during the compression process, and the temperature of the rotor and the casing will also rise accordingly. Therefore, during the suction process, the gas will be heated by the rotor and the casing and expand, so the suction volume will be reduced accordingly. Some of the rotors of screw air compressors are cooled by oil, and the casing is cooled by water. However, the lubricating oil cannot completely remove the heat transferred to the screw by simply cooling the surface of the screw by spraying oil and mixing compressed gas. As the screw speed increases, the cooling effect of this mixed lubricating oil cooling method becomes worse and worse. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes an air compressor rotor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An air compressor rotor comprises a rotating shaft, a threaded protrusion fixedly arranged on the outer surface of the rotating shaft in a spiral shape, an oil inlet, an oil inlet channel, an oil outlet channel and an oil outlet, wherein the oil inlet channel is arranged in the rotating shaft, the oil inlet channel is an annular channel, and its axis is consistent with the axis of the rotating shaft, the oil outlet channel is arranged in the rotating shaft and is arranged along the axis direction of the rotating shaft, the oil inlet channel and the oil outlet channel are connected on one side, the oil inlet is connected to the oil inlet channel, and the oil outlet is connected to the oil outlet channel. When the rotor is working, normal temperature heat transfer oil is transported to the oil inlet channel through the oil inlet, cools the rotating shaft from the inside, and then enters the oil outlet channel from the other end of the oil inlet channel, and the heated heat transfer oil flows out from the oil outlet.

[0006] Preferably, a connecting channel is provided at one end of the oil inlet channel away from the oil inlet port, one end of the connecting channel is connected to the oil inlet channel, and the other end is connected to the oil outlet channel, a rotary joint is rotatably mounted on the rotating shaft, the rotary joint comprises joint 1 and joint 2, an annular groove 1 is provided on the inner side of the joint 1, a connecting pipe 1 is provided on the outer side of the rotary joint, an annular groove 2 is provided on the inner side of the joint 2, a connecting pipe 2 is provided on the outer side of the joint 2, the oil inlet port is connected to the annular groove 1, and the oil outlet port is connected to the annular groove 2.

[0007] Preferably, the oil inlet and the oil outlet are both arranged at the end of the rotating shaft close to the air inlet end, the width of the oil inlet channel at one end close to the oil inlet is narrower than that at the other end, and the diameter of the oil inlet is smaller than that of the oil outlet.

[0008] Preferably, an annular cavity is provided on the outside of the oil inlet channel, and the annular cavity is located inside the threaded protrusion. By providing the annular cavity, the contact area between the oil inlet channel and the threaded protrusion is increased, thereby improving the heat conduction effect of the heat transfer oil.

[0009] Preferably, an annular protrusion is arranged around the outer surface of the rotating shaft, and two pairs of the annular protrusions are arranged, one pair is located on both sides of the oil inlet, and the other pair is located on both sides of the oil outlet, and the rotating joint is rotatably connected to the annular protrusions.

[0010] Preferably, both the connecting pipe 1 and the connecting pipe 2 are provided with a one-way valve, and the heat transfer oil is introduced from the connecting pipe 1, transported to the oil inlet channel through the oil inlet, and then discharged from the oil outlet to the connecting pipe 2 through the oil outlet channel.

[0011] The beneficial effect of the utility model is that by setting the oil inlet channel and the oil outlet channel, the heat transfer oil cools the rotor from the inside of the rotating shaft, the heat transfer oil enters the oil inlet channel from the side of the air inlet end with a lower temperature, flows to the side of the air outlet end with a higher temperature, and then flows from the central oil outlet channel to the air inlet end with a lower temperature and is discharged, thereby reducing the temperature difference between the two ends of the threaded protrusion. The high temperature section of the oil inlet channel is wider than the low temperature section, thereby preventing the heat transfer oil from expanding and contracting due to heat and causing problems in circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of an air compressor rotor proposed by the utility model;

[0013] Figure 2 for Figure 1 Front view of

[0014] Figure 3 for Figure 2 Sectional view at AA;

[0015] Figure 4 for Figure 2 Cross-sectional view at BB;

[0016] Figure 5 is a structural schematic diagram of a connector 1;

[0017] Figure 6 is a schematic diagram of the structure of the joint 2;

[0018] Figure 7 for Figure 3 Enlarged schematic diagram of point C.

[0019] In the figure: 1 rotating shaft, 11 annular protrusion, 2 threaded protrusion, 3 oil inlet, 4 oil inlet channel, 40 connecting channel, 41 annular cavity, 5 oil outlet channel, 6 oil outlet, 7 rotating joint, 71 joint 1, 711 annular groove 1, 712 connecting pipe 1, 72 joint 2, 721 annular groove 2, 722 connecting pipe 2. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms center, top, bottom, left, right, vertical, horizontal, inside, outside, etc. are based on the directions or positional relationships shown in the 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms first, second, and third are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] Please refer to Figure 1-7 , an air compressor rotor, comprising a rotating shaft 1, a threaded protrusion 2 spirally fixedly arranged on the outer surface of the rotating shaft 1, an oil inlet 3, an oil inlet channel 4, an oil outlet channel 5 and an oil outlet 6, wherein the oil inlet channel 4 is arranged in the rotating shaft 1, and in order to maintain the stable rotation of the rotating shaft 1, the oil inlet channel 4 is an annular channel, and its axis is consistent with the axis of the rotating shaft 1, the oil outlet channel 5 is arranged in the rotating shaft 1, and is arranged along the axis direction of the rotating shaft 1, the oil inlet channel 4 and the oil outlet channel 5 are connected on one side, the oil inlet 3 is connected to the oil inlet channel 4, and the oil outlet 6 is connected to the oil outlet channel 5. When the rotor is working, normal temperature heat transfer oil is transported to the oil inlet channel 4 through the oil inlet 3, and the rotating shaft 1 is cooled from the inside, and then the heated heat transfer oil enters the oil outlet channel 5 from the other end of the oil inlet channel 4, and then flows out from the oil outlet 6.

[0023] In order to form a passage between the oil inlet channel 4 and the oil outlet channel 5 , a connecting channel 40 is provided at one end of the oil inlet channel 4 away from the oil inlet port 3 , one end of the connecting channel 40 is connected to the oil inlet channel 4 , and the other end is connected to the oil outlet channel 5 .

[0024] In order to prevent the rotor from affecting the inflow and outflow of the heat transfer oil when rotating, a rotary joint 7 is rotatably mounted on the rotating shaft 1, and the rotary joint 7 includes a joint 1 71 and a joint 2 72. An annular groove 1 711 is arranged on the inner side of the joint 1 71, and a connecting pipe 1 712 is arranged on the outer side of the rotary joint 7. An annular groove 2 721 is arranged on the inner side of the joint 2 72, and a connecting pipe 2 722 is arranged on the outer side of the joint 2 72. The oil inlet 3 is connected to the annular groove 1 711, and the oil outlet 6 is connected to the annular groove 2 721. The heat transfer oil enters the annular groove 1 711 from the connecting pipe 1 712, and then enters the oil inlet 3 to reach the oil inlet channel 4, and then reaches the oil outlet 6 from the oil outlet channel 5, and is discharged from the connecting pipe 2 722 after passing through the annular groove 2 721.

[0025] Since the temperature of the gas will increase during the compression process, the temperature of the air inlet end of the rotating shaft 1 is higher than that of the air outlet end. In order to reduce the temperature difference between the two ends of the rotating shaft 1, the oil inlet 3 and the oil outlet 6 are both arranged at the end of the rotating shaft 1 close to the air inlet end of the air compressor. The heat transfer oil at room temperature enters the oil inlet channel 4 from the oil inlet 3 and flows to the end of the rotating shaft 1 away from the air inlet end of the air compressor. The temperature rises and then flows back from the oil outlet channel 5 to the end of the rotating shaft 1 close to the air inlet end, thereby reducing the temperature difference between the two ends of the rotating shaft 1. In order to prevent the end of the rotating shaft 1 with a higher temperature from deforming due to temperature increase and causing the oil inlet channel 4 to become smaller, the width of the oil inlet channel 4 at one end close to the oil inlet 3 is narrower than that at the other end, and the diameter of the oil inlet 3 is smaller than that of the oil outlet 6.

[0026] An annular cavity 41 is provided on one side of the oil inlet channel 4 close to the threaded protrusion 2 , and the annular cavity 41 is located inside the threaded protrusion 2 . By providing the annular cavity 41 , the contact area between the oil inlet channel 4 and the threaded protrusion 2 is increased, thereby improving the heat conduction effect of the heat transfer oil on the threaded protrusion 2 .

[0027] In order to facilitate the rotation of the rotating shaft 1 relative to the rotating joint 7, an annular protrusion 11 is arranged around the outer surface of the rotating shaft 1. The annular protrusion 11 is provided in two pairs, one pair is located on both sides of the oil inlet 3, and the other pair is located on both sides of the oil outlet 6. The rotating joint 7 is rotatably connected to the annular protrusion 11.

[0028] In order to make the heat transfer oil flow in a directional manner, both the connecting pipe 1 712 and the connecting pipe 2 722 are provided with a one-way valve, so that the heat transfer oil is introduced from the connecting pipe 1 712, transported to the oil inlet channel 4 through the oil inlet 3, and then discharged from the oil outlet 6 to the connecting pipe 2 722 through the oil outlet channel 5.

[0029] When the rotor is working, the rotary joint 7 is fixed, and the rotating shaft 1 rotates relative to the rotary joint 7. The temperature of the rotor increases accordingly, especially the temperature of the end of the rotating shaft 1 away from the air inlet end will be higher. The heat transfer oil at room temperature enters the oil inlet 3 from the joint 1 71, flows to the end with a higher temperature through the oil inlet channel 4, and then flows to the end with a lower temperature from the oil outlet channel 5 through the connecting channel 40, and then is discharged from the oil outlet 6 through the joint 2 72. The discharged heat transfer oil is cooled by a cooling mechanism outside and then enters the rotating shaft 1 from the oil inlet 3. The above steps are repeated to circulate and cool the rotating shaft 1.

Claims

1. An air compressor rotor, characterized in that: The invention comprises a rotating shaft (1), a threaded protrusion (2) fixedly arranged in a spiral shape on the outer surface of the rotating shaft (1), an oil inlet (3), an oil inlet channel (4), an oil outlet channel (5) and an oil outlet (6), wherein the oil inlet channel (4) is arranged in the rotating shaft (1), the oil inlet channel (4) is an annular channel, and its axis is consistent with the axis of the rotating shaft (1), the oil outlet channel (5) is arranged in the rotating shaft (1) and is arranged along the axis direction of the rotating shaft (1), the oil inlet channel (4) and the oil outlet channel (5) are connected at one side, the oil inlet (3) is connected to the oil inlet channel (4), the oil outlet (6) is connected to the oil outlet channel (5), and a rotary joint (7) is rotatably mounted on the rotating shaft (1).

2. An air compressor rotor according to claim 1, characterized in that: The rotary joint (7) comprises a joint 1 (71) and a joint 2 (72); an annular groove 1 (711) is arranged on the inner side of the joint 1 (71); a connecting pipe 1 (712) is arranged on the outer side of the rotary joint (7); an annular groove 2 (721) is arranged on the inner side of the joint 2 (72); a connecting pipe 2 (722) is arranged on the outer side of the joint 2 (72); the oil inlet (3) is connected to the annular groove 1 (711); and the oil outlet (6) is connected to the annular groove 2 (721).

3. The air compressor rotor according to claim 1, characterized in that: An annular protrusion (11) is arranged around the outer surface of the rotating shaft (1). The annular protrusion (11) is arranged in two pairs, one pair is located on both sides of the oil inlet (3), and the other pair is located on both sides of the oil outlet (6). The rotating joint (7) is rotatably connected to the annular protrusion (11).

4. The air compressor rotor according to claim 1, characterized in that: The oil inlet (3) and the oil outlet (6) are both arranged at one end of the rotating shaft (1) close to the air inlet end of the air compressor; the width of one end of the oil inlet channel (4) close to the oil inlet (3) is narrower than that of the other end; and the diameter of the oil inlet (3) is smaller than that of the oil outlet (6).

5. The air compressor rotor according to claim 1, characterized in that: An annular cavity (41) is provided on one side of the oil inlet passage (4) close to the threaded protrusion (2), and the annular cavity (41) is located inside the threaded protrusion (2).

6. The air compressor rotor according to claim 1, characterized in that: A connecting channel (40) is provided at one end of the oil inlet channel (4) away from the oil inlet port (3); one end of the connecting channel (40) is in communication with the oil inlet channel (4), and the other end is in communication with the oil outlet channel (5).

7. An air compressor rotor according to claim 2, characterized in that: Both the connecting pipe 1 (712) and the connecting pipe 2 (722) are provided with a one-way valve.

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