Bearing and gear of oil-free screw machine

Abstract

The utility model discloses a bearing and a gear of an oil-free screw machine, which comprise a male rotor body, a female rotor body and an oil-free screw machine shell, and are characterized in that a male rotor bearing spacer bush and a male rotor synchronous end four-point contact ball bearing are additionally arranged between a male rotor synchronous end cylindrical roller bearing and a male rotor synchronous gear at the synchronous end of the male rotor body; a female rotor bearing spacer bush and a female rotor synchronous end four-point contact ball bearing are additionally arranged between a female rotor synchronous end cylindrical roller bearing and a female rotor synchronous gear at the synchronous end of the female rotor body, so that the male rotor body and the female rotor body can effectively bear larger continuous axial load; the four-point contact ball bearing at the synchronous end of the male rotor and the four-point contact ball bearing at the synchronous end of the female rotor are positioned only by virtue of the end surfaces of the bearings and the inner ring, so that the bearings cannot be excessively abraded; therefore, the male rotor body and the female rotor body can operate more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-free screw machines, in particular to a bearing and a gear of an oil-free screw machine. Background Art

[0002] On-board oil-free screw air compressors are mainly used to transport granular materials such as cement, lime powder, and feed. They are commonly used transportation devices in mines, chemical plants, and tank ships. The core of a dry screw air compressor is the mutual meshing and rotation of the yin and yang rotors, but the pair of rotors must not rub against each other. Rubbing will affect the performance of the compressed air, increase the noise, and even damage the rotors in severe cases. This requires that the machining accuracy of various parts on the rotor is very high and that they can operate smoothly at high speeds. In order to achieve this goal, cylindrical roller bearings are installed at both ends of the rotor. The outer and inner rings of the bearings are interference fits. After installation, the rotor can be accurately positioned in the radial direction, and the concentricity of the rotor in the rotor seat will not be lost due to assembly, and there will be no shaking during operation.

[0003] However, when testing the existing oil-free screw compressor, it was found that after a long period of high-performance operation, abnormal noise occurred. After disassembly, it was found that the clearance between the rotor inlet and outlet ends had a large displacement, the bearings had abnormal wear, the engine oil had turned black, and the oil contained a lot of iron filings. After comparative analysis, one reason is that although the cylindrical roller bearing has a strong radial load, the axial load is weak. The rotor will generate a large axial thrust during the air compression process, which exceeds the axial load upper limit of the cylindrical roller bearing. The other reason is that the side clearance of the synchronous gear is too large. When the rotor does work in the rotor chamber, it is affected by the matching of the synchronous gear, the vibration is large, and the air pressure fluctuates greatly, which also causes the rotor axial load to increase.

[0004] Therefore, a new bearing and gear of an oil-free screw machine are proposed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a bearing and a gear of an oil-free screw machine, so as to solve the problems in the prior art that the bearing of the existing oil-free screw machine is seriously worn during use and the rotor is not very stable during operation.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bearing and gear of an oil-free screw machine, comprising a male rotor body, a female rotor body and an oil-free screw machine casing, wherein the male rotor body is installed and connected to an internal position of the oil-free screw machine casing, the outer side of the male rotor body is located on the oil-free screw machine casing and the female rotor body is arranged, a male rotor speed-increasing end cylindrical roller bearing is arranged on the front circumference of the male rotor body, a male rotor synchronous end cylindrical roller bearing is arranged on the rear circumference of the male rotor body, the outer side of the male rotor synchronous end cylindrical roller bearing is located on the male rotor body and a male rotor bearing spacer is arranged, and the outer side of the male rotor bearing spacer is located on the male rotor A four-point contact ball bearing for the synchronous end of the male rotor is arranged on the main body, and a male rotor synchronous gear is arranged on the outer side of the four-point contact ball bearing for the synchronous end of the male rotor, a female rotor speed increasing end cylindrical roller bearing is arranged on the front circumference of the female rotor body, a female rotor synchronous end cylindrical roller bearing is arranged on the rear circumference of the female rotor body, a female rotor bearing spacer is arranged on the outer side of the female rotor synchronous end cylindrical roller bearing, a female rotor bearing spacer is arranged on the female rotor body, a four-point contact ball bearing for the synchronous end of the female rotor is arranged on the outer side of the female rotor bearing spacer, and a female rotor synchronous gear is arranged on the outer side of the four-point contact ball bearing for the synchronous end of the female rotor on the male rotor body.

[0007] Among them, the positive rotor synchronous gear includes a positive synchronous gear groove, a positive synchronous gear body and a positive synchronous gear shaft groove. The positive synchronous gear groove is arranged on the circumferential side of the positive synchronous gear body, and a positive synchronous gear shaft groove is arranged inside the positive synchronous gear body. The positive synchronous gear body is connected to the positive rotor body through the positive synchronous gear shaft groove.

[0008] Among them, the female rotor synchronous gear includes a female synchronous gear sleeve cavity, a female synchronous gear body, a female synchronous gear groove and an internal mounting hole. The female synchronous gear sleeve cavity is arranged inside the female synchronous gear body, and the outer side of the female synchronous gear sleeve cavity is provided with an internal mounting hole on the female synchronous gear body. The female synchronous gear groove is arranged on the circumferential side of the female synchronous gear body, and the female synchronous gear body is connected to the female rotor body through the female synchronous gear sleeve cavity.

[0009] Among them, the cylindrical roller bearing at the speed-increasing end of the male rotor includes an inner bearing shell, a bearing shell cavity hole, a cylindrical roller bearing shell at the speed-increasing end, a first cylindrical roller, an intermediate bearing shell and a second cylindrical roller. The first cylindrical roller is arranged around the inner side of the cylindrical roller bearing shell at the speed-increasing end, the intermediate bearing shell is arranged around the inner side of the first cylindrical roller, the second cylindrical roller is arranged around the inner side of the intermediate bearing shell, the inner side of the second cylindrical roller is arranged around the inner side of the inner bearing shell, the inner side of the inner bearing shell is arranged with a bearing shell cavity hole, the inner bearing shell is connected to the male rotor body through the bearing shell cavity hole, and the cylindrical roller bearing shell at the speed-increasing end is connected to the oil-free screw machine casing.

[0010] The male rotor body and the female rotor body are sleeved inside the oil-free screw machine casing, and a rotation gap is provided between the male rotor body and the female rotor body.

[0011] Wherein, the cylindrical roller bearing at the speed increasing end of the male rotor is installed and connected to the speed increasing end of the male rotor body.

[0012] Wherein, the cylindrical roller bearing at the synchronous end of the male rotor is installed and connected to the synchronous end of the female rotor body.

[0013] In summary, due to the adoption of the above technology, the beneficial effects of the utility model are:

[0014] 1. In the utility model, a male rotor bearing spacer and a male rotor synchronous end four-point contact ball bearing are added between the male rotor synchronous end cylindrical roller bearing and the male rotor synchronous gear at the synchronous end of the male rotor body, and a female rotor bearing spacer and a female rotor synchronous end four-point contact ball bearing are added between the female rotor synchronous end cylindrical roller bearing and the female rotor synchronous gear at the synchronous end of the female rotor body, so that the male rotor body and the female rotor body can effectively withstand a large continuous axial load, and the male rotor synchronous end four-point contact ball bearing and the female rotor synchronous end four-point contact ball bearing have a gap with the oil-free screw machine casing bearing seat, and are only positioned by the bearing end face and the inner ring, so that they are only subjected to radial loads, so that the bearings will not have excessive wear.

[0015] 2. In the utility model, by changing the side clearance and precision of the male rotor synchronous gear and the female rotor synchronous gear, the male rotor body and the female rotor body can run more smoothly, and the axial clearance and radial clearance of the rotor can be adjusted more easily during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the side cross-sectional structure of the bearing and gear of an oil-free screw machine of the utility model;

[0017] Figure 2This is a schematic diagram of the structure of the male rotor synchronous gear of the bearing and gear of an oil-free screw machine of the utility model;

[0018] Figure 3 for Figure 2 The utility model is a schematic diagram of the side cross-sectional structure of the male rotor synchronous gear of the bearing and gear of an oil-free screw machine;

[0019] Figure 4 This is a schematic diagram of the structure of the female rotor synchronous gear of the bearing and gear of an oil-free screw machine of the utility model;

[0020] Figure 5 for Figure 4 The utility model is a schematic diagram of the side cross-sectional structure of the female rotor synchronous gear of the bearing and gear of an oil-free screw machine;

[0021] Figure 6 The utility model is a schematic diagram of the structure of a cylindrical roller bearing at the speed increasing end of a male rotor of a bearing and a gear of an oil-free screw machine.

[0022] In the figure: 1. Cylindrical roller bearing at the speed increasing end of the male rotor; 111. Inner bearing sleeve; 112. Bearing sleeve cavity hole; 113. Cylindrical roller bearing housing at the speed increasing end; 114. First cylindrical roller; 115. Intermediate bearing sleeve; 116. Second cylindrical roller; 2. Cylindrical roller bearing at the synchronous end of the male rotor; 3. Spacer sleeve of male rotor bearing; 4. Four-point contact ball bearing at the synchronous end of the male rotor; 5. Synchronous gear of the male rotor; 51. Male synchronous gear groove; 52. Male synchronous gear Main body; 53, male synchronous gear shaft groove; 6, female rotor speed-increasing end cylindrical roller bearing; 7, female rotor synchronous end cylindrical roller bearing; 8, female rotor bearing spacer; 9, female rotor synchronous end four-point contact ball bearing; 10, female rotor synchronous gear; 101, female synchronous gear sleeve cavity; 102, female synchronous gear main body; 103, female synchronous gear groove; 104, internal mounting hole; 11, male rotor main body; 12, female rotor main body; 13, oil-free screw machine casing. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.

[0024] Embodiment 1

[0025] Reference Figure 1-Figure 5 A bearing and gear of an oil-free screw machine, comprising a male rotor body 11, a female rotor body 12 and an oil-free screw machine casing 13, wherein the male rotor body 11 is installed and connected to an inner position of the oil-free screw machine casing 13, the outer side of the male rotor body 11 is located on the oil-free screw machine casing 13 and the female rotor body 12 is arranged, a male rotor speed-increasing end cylindrical roller bearing 1 is arranged on the front circumference of the male rotor body 11, a male rotor synchronous end cylindrical roller bearing 2 is arranged on the rear circumference of the male rotor body 11, a male rotor bearing spacer 3 is arranged on the outer side of the male rotor body 11, and a male rotor bearing spacer 3 is arranged on the outer side of the male rotor body 11. A four-point contact ball bearing 4 is provided at the sub-synchronous end, and a male rotor synchronous gear 5 is arranged on the outer side of the four-point contact ball bearing 4 at the synchronous end of the male rotor, and a female rotor speed increasing end cylindrical roller bearing 6 is arranged on the front circumference of the female rotor body 12, and a female rotor synchronous end cylindrical roller bearing 7 is arranged on the rear circumference of the female rotor body 12, and a female rotor bearing spacer 8 is arranged on the outer side of the female rotor synchronous end cylindrical roller bearing 7, and a female rotor bearing spacer 8 is arranged on the female rotor body 12, and a female rotor synchronous end four-point contact ball bearing 9 is arranged on the outer side of the female rotor bearing spacer 8, and a female rotor synchronous end four-point contact ball bearing 9 is arranged on the female rotor body 12, and a female rotor synchronous gear 10 is arranged on the outer side of the four-point contact ball bearing 9 at the synchronous end of the female rotor, and a female rotor synchronous gear 10 is arranged on the male rotor body 11.

[0026] In the utility model, the male rotor synchronous gear 5 includes a male synchronous gear groove 51, a male synchronous gear body 52 and a male synchronous gear shaft groove 53. The male synchronous gear groove 51 is arranged on the circumferential side of the male synchronous gear body 52, and the male synchronous gear shaft groove 53 is arranged inside the male synchronous gear body 52. ​​The male synchronous gear body 52 is connected to the male rotor body 11 through the male synchronous gear shaft groove 53. The male synchronous gear body 52 of the male rotor synchronous gear 5 is installed and connected to the male rotor body 11 through the male synchronous gear shaft groove 53. The male synchronous gear body 52 can mesh with the outside through the male synchronous gear groove 51 on the circumferential side, and the side clearance of the male synchronous gear groove 51 is changed from the original 0.18-0.25mm to 0.095-0.135mm side clearance. The reduction of the side clearance can make the rotor run more smoothly, and it is also easier to adjust the axial clearance and radial clearance of the rotor during assembly.

[0027] In the present invention, the female rotor synchronous gear 10 comprises a female synchronous gear sleeve cavity 101, a female synchronous gear body 102, a female synchronous gear groove 103 and an internal mounting hole 104. The female synchronous gear sleeve cavity 101 is arranged inside the female synchronous gear body 102, the outer side of the female synchronous gear sleeve cavity 101 is located on the female synchronous gear body 102 and an internal mounting hole 104 is arranged, and the circumferential side of the female synchronous gear body 102 is provided with a female synchronous gear groove 103. The female synchronous gear body 102 is connected to the female rotor body 12 through the female synchronous gear sleeve cavity 101. The female synchronous gear body 102 of the female rotor synchronous gear 10 is installed and connected to the female rotor body 12 through the female synchronous gear sleeve cavity 101, and can correspond through the internal mounting hole 104. The female synchronous gear body 102 can be meshed and transmitted due to the female synchronous gear groove 103 on the circumferential side, and the side clearance of the female synchronous gear groove 103 is changed from the original 0.18-0.25mm to 0.095-0.135mm side clearance. The reduction of the side clearance can make the rotor run more smoothly, and it is also easier to adjust the axial clearance and radial clearance of the rotor during assembly.

[0028] In the present invention, the male rotor body 11 and the female rotor body 12 are sleeved inside the oil-free screw machine casing 13, and a rotation gap is provided between the male rotor body 11 and the female rotor body 12, so that they can be used for corresponding transmission.

[0029] In the utility model, the cylindrical roller bearing 1 at the speed increasing end of the male rotor is installed and connected to the speed increasing end of the male rotor body 11, so that it can be installed and used accordingly and effectively positioned.

[0030] In the utility model, the cylindrical roller bearing 2 at the synchronous end of the male rotor is installed and connected to the synchronous end of the female rotor body 12, so that they can be installed and connected for use and effectively positioned.

[0031] Working principle: When in use, the male rotor body 11 and the female rotor body 12 rotate inside the oil-free screw machine casing 13, and the front ends of the male rotor body 11 and the female rotor body 12 pass through the male rotor speed-increasing end cylindrical roller bearing 1 and the female rotor speed-increasing end cylindrical roller bearing 6, so that they can be used for positioning transmission, by adding a male rotor bearing spacer 3 and a male rotor synchronization end four-point contact ball bearing 4 between the male rotor synchronization end cylindrical roller bearing 2 and the male rotor synchronization gear 5 at the synchronization end of the male rotor body 11, and adding a female rotor bearing spacer 8 and a female rotor synchronization end four-point contact ball bearing 9 between the female rotor synchronization end cylindrical roller bearing 7 and the female rotor synchronization gear 10 at the synchronization end of the female rotor body 12, so that the male rotor The body 11 and the female rotor body 12 can effectively withstand a large continuous axial load, and the four-point contact ball bearing 4 at the synchronous end of the male rotor and the four-point contact ball bearing 9 at the synchronous end of the female rotor have a gap with the bearing seat of the oil-free screw machine casing 13, and are positioned only by the bearing end face and the inner ring, so that they are only subjected to radial loads, so that the bearings will not have excessive wear, and the side clearance of the male rotor synchronous gear 5 and the female rotor synchronous gear 10 becomes smaller. The reduction in the side clearance can make the operation of the male rotor body 11 and the female rotor body 12 more stable, and the accuracy of the male rotor synchronous gear 5 and the female rotor synchronous gear 10 is increased, and the accuracy is optimized from level 6 to level 5. The improvement in accuracy and the tooth drum repair can reduce noise during operation and improve the texture.

[0032] Embodiment 2

[0033] Reference Figure 1 and Figure 6 , a bearing and gear of an oil-free screw machine. Compared with the first embodiment, the cylindrical roller bearing 1 at the speed-increasing end of the male rotor in this embodiment includes an inner bearing shell 111, a bearing shell cavity hole 112, a speed-increasing end cylindrical roller bearing shell 113, a first cylindrical roller 114, an intermediate bearing shell 115 and a second cylindrical roller 116. The first cylindrical roller 114 is arranged around the inner side of the speed-increasing end cylindrical roller bearing shell 113, the first cylindrical roller 114 is arranged around the inner side of the intermediate bearing shell 115, the second cylindrical roller 116 is arranged around the inner side of the intermediate bearing shell 115, the inner side of the second cylindrical roller 116 is arranged around the inner side of the inner bearing shell 111, the inner side of the inner bearing shell 111 is provided with a bearing shell cavity hole 112, the inner bearing shell 111 is connected to the male rotor body 11 through the bearing shell cavity hole 112, and the speed-increasing end cylindrical roller bearing shell 113 is connected to the oil-free screw machine casing 13.

[0034] Working principle: The cylindrical roller bearing housing 113 of the cylindrical roller bearing 1 at the speed increasing end of the male rotor is installed and connected to the oil-free screw machine casing 13. The intermediate bearing sleeve 115 on the inner side of the oil-free screw machine casing 13 can be positioned and rolled by the first cylindrical roller 114, and the inner bearing sleeve 111 can be positioned and rolled by the second cylindrical roller 116, thereby effectively ensuring the stable state of the overall rotation.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A bearing and gear of an oil-free screw machine, comprising a male rotor body (11), a female rotor body (12) and an oil-free screw machine casing (13), wherein the male rotor body (11) is mounted and connected to an inner position of the oil-free screw machine casing (13), and the outer side of the male rotor body (11) is provided with a female rotor body (12) on the oil-free screw machine casing (13), characterized in that: A male rotor speed-increasing end cylindrical roller bearing (1) is arranged on the front circumference of the male rotor body (11); a male rotor synchronizing end cylindrical roller bearing (2) is arranged on the rear circumference of the male rotor body (11); a male rotor bearing spacer (3) is arranged on the male rotor body (11) on the outer side of the male rotor synchronizing end cylindrical roller bearing (2); a male rotor synchronizing end four-point contact ball bearing (4) is arranged on the male rotor body (11) on the outer side of the male rotor bearing spacer (3); a male rotor synchronizing end four-point contact ball bearing (4) is arranged on the male rotor body (11) on the outer side of the male rotor synchronizing end four-point contact ball bearing (4); a male rotor synchronizing gear (5) is arranged on the male rotor body (11) on the outer side of the male rotor synchronizing end four-point contact ball bearing (4); A female rotor speed-increasing end cylindrical roller bearing (6) is arranged on the front circumference of the female rotor body (12), a female rotor synchronizing end cylindrical roller bearing (7) is arranged on the rear circumference of the female rotor body (12), a female rotor bearing spacer (8) is arranged on the female rotor body (12) on the outer side of the female rotor synchronizing end cylindrical roller bearing (7), a female rotor synchronizing end four-point contact ball bearing (9) is arranged on the female rotor body (12) on the outer side of the female rotor bearing spacer (8), and a female rotor synchronizing end four-point contact ball bearing (9) is arranged on the female rotor body (12) on the outer side of the female rotor synchronizing end four-point contact ball bearing (9), and a female rotor synchronizing gear (10) is arranged on the male rotor body (11) on the outer side of the female rotor synchronizing end four-point contact ball bearing (9).

2. The bearing and gear of an oil-free screw machine according to claim 1, characterized in that: The male rotor synchronous gear (5) comprises a male synchronous gear groove (51), a male synchronous gear body (52) and a male synchronous gear shaft groove (53); the male synchronous gear groove (51) is arranged on the circumferential side of the male synchronous gear body (52); the male synchronous gear shaft groove (53) is arranged inside the male synchronous gear body (52); and the male synchronous gear body (52) is connected to the male rotor body (11) via the male synchronous gear shaft groove (53).

3. The bearing and gear of an oil-free screw machine according to claim 1, characterized in that: The female rotor synchronous gear (10) comprises a female synchronous gear sleeve cavity (101), a female synchronous gear body (102), a female synchronous gear groove (103) and an internal mounting hole (104); the female synchronous gear sleeve cavity (101) is arranged inside the female synchronous gear body (102); the internal mounting hole (104) is arranged on the outer side of the female synchronous gear sleeve cavity (101) and on the female synchronous gear body (102); the female synchronous gear groove (103) is arranged on the circumferential side of the female synchronous gear body (102); and the female synchronous gear body (102) is connected to the female rotor body (12) via the female synchronous gear sleeve cavity (101).

4. The bearing and gear of an oil-free screw machine according to claim 1, characterized in that: The male rotor speed-increasing end cylindrical roller bearing (1) comprises an inner bearing shell (111), a bearing shell cavity hole (112), a speed-increasing end cylindrical roller bearing shell (113), a first cylindrical roller (114), an intermediate bearing shell (115) and a second cylindrical roller (116); the speed-increasing end cylindrical roller bearing shell (113) is provided with a first cylindrical roller (114) on the inner side thereof, and the intermediate bearing shell (115) is provided with a first cylindrical roller (114) on the inner side thereof. A second cylindrical roller (116) is arranged on the inner side of the intermediate bearing sleeve (115), an inner bearing sleeve (111) is arranged on the inner side of the second cylindrical roller (116), a bearing sleeve cavity hole (112) is arranged inside the inner bearing sleeve (111), the inner bearing sleeve (111) is connected to the male rotor body (11) through the bearing sleeve cavity hole (112), and the speed-increasing end cylindrical roller bearing housing (113) is connected to the oil-free screw machine housing (13).

5. The bearing and gear of an oil-free screw machine according to claim 4, characterized in that: The male rotor body (11) and the female rotor body (12) are sleeved inside an oil-free screw machine casing (13), and a rotation gap is provided between the male rotor body (11) and the female rotor body (12).

6. The bearing and gear of an oil-free screw machine according to claim 1, characterized in that: The cylindrical roller bearing (1) at the speed increasing end of the male rotor is installed and connected to the speed increasing end of the male rotor body (11).

7. The bearing and gear of an oil-free screw machine according to claim 1, characterized in that: The male rotor synchronous end cylindrical roller bearing (2) is installed and connected to the synchronous end of the female rotor body (12).

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