Vertical transmission assembly for axial flow fan of air cooler

Abstract

The vertical transmission assembly comprises a main shaft, a transmission box, an upper bearing, a lower bearing, an upper end cover and a lower end cover, the upper end cover and the lower end cover are connected to the two ends of the transmission box correspondingly, the upper bearing and the lower bearing are contained in the transmission box correspondingly, and the upper bearing and the lower bearing are located at the top and the bottom of the transmission box correspondingly; the upper bearing is a first deep groove ball bearing, the lower bearing is a combination of a second deep groove ball bearing and a one-way thrust ball bearing, a second wave spring is further arranged between the first deep groove ball bearing and the upper end cover, and / or an elastic pre-tightening assembly is further arranged above the second deep groove ball bearing and arranged outside the main shaft in a sleeving mode. And the inner wall of the transmission case is limited and connected to the top of the second deep groove ball bearing. The bearing can effectively bear high-load axial force, reduces bearing temperature rise, prolongs the service life of the bearing, and has the advantages of being simple in structure, stable and reliable in operation and convenient and fast to maintain in the later period.

Description

Technical Field

[0001] The present application relates to the technical field of fluid machinery, and in particular to a vertical transmission assembly for an axial flow fan of an air cooler. Background Art

[0002] The air-cooled axial flow fan is installed beneath the finned tube bundle of an air-cooled heat exchanger, providing cooling air for the bundle. The vertical drive assembly of the air-cooled axial flow fan connects the fan impeller and the driven pulley. To meet operational requirements, the drive assembly must be stable, reliable, and easy to maintain.

[0003] In the prior art, an air cooler axial flow fan uses a vertical transmission assembly, which includes a main shaft, a transmission box, an upper bearing, an upper end cover, a lower bearing and a lower end cover, wherein the main shaft is assembled at the central axis of the transmission box, and the upper bearing and the lower bearing are respectively located at the two ends of the transmission box, and are respectively equipped with an upper end cover and a lower end cover, wherein the upper bearing adopts a deep groove ball bearing, and the lower bearing adopts a combination of a deep groove ball bearing and a one-way thrust ball bearing, thereby replacing the traditional transmission method of angular contact bearings that need to be used in pairs. Although this bearing combination can reduce production costs, the stability of this bearing is still insufficient. Friction and wear will occur when the bearing and the main shaft move relative to each other, and it is very likely that gaps or component sliding will occur under the working load.

[0004] Therefore, there is an urgent need for a vertical transmission assembly for an air cooler axial flow fan with a simple structure, stable and reliable operation, and non-slip transmission. Utility Model Content

[0005] The purpose of the present application is to provide a vertical transmission assembly for an axial flow fan of an air cooler, so as to solve the problems existing in the prior art such as poor stability and general practicality during the transmission process.

[0006] The embodiments of the present application can be implemented through the following technical solutions:

[0007] A vertical transmission assembly for an axial flow fan of an air cooler, comprising a main shaft, a transmission box, an upper bearing, a lower bearing, an upper end cover and a lower end cover;

[0008] The upper end cover and the lower end cover are respectively connected to the two ends of the transmission box, and the upper bearing and the lower bearing are respectively accommodated inside the transmission box. The upper bearing and the lower bearing are respectively located at the top and bottom of the transmission box, and an O-ring is further connected between the outer ring of the upper bearing and / or the lower bearing and the inner wall of the transmission box;

[0009] The inner wall of the transmission box is a constant diameter inner wall, the upper bearing is a first deep groove ball bearing, and the lower bearing is a combination of a second deep groove ball bearing and a one-way thrust ball bearing;

[0010] A second wave spring is also provided between the first deep groove ball bearing and the upper end cover; and / or an elastic pre-tightening component is also provided above the second deep groove ball bearing, and the pre-tightening component is sleeved on the outside of the main shaft and is limited by the inner wall of the transmission box and connected to the top of the second deep groove ball bearing.

[0011] Furthermore, a second groove is provided on the inner wall of the upper portion of the transmission case along its circumference, and the O-ring is accommodated in the second groove and contacts the outer ring of the upper bearing.

[0012] Furthermore, the second wave spring is connected between the outer ring of the first deep groove ball bearing and the upper end cover.

[0013] Furthermore, the pre-tightening assembly includes a first wave spring and a retaining spring, and the retaining spring is limited by the inner wall of the transmission box;

[0014] The first wave spring is limited in a gap between the retaining spring and the second deep groove ball bearing.

[0015] Furthermore, the pre-tightening assembly also includes a pressure plate, the inner edge of the pressure plate cooperates with the main shaft, the outer edge of the pressure plate cooperates with the transmission box, and the pressure plate is accommodated in the gap between the retaining spring and the top of the lower bearing.

[0016] Furthermore, the pressure plate is an annular cover-shaped structure with a downwardly convex outer edge, and the first wave spring is arranged between the outer edge of the pressure plate and the outer ring of the second deep groove ball bearing.

[0017] Furthermore, the inner wall of the transmission box is a constant diameter inner wall, the inner wall of the lower part of the transmission box is provided with a first groove arranged along its circumference, and the retaining spring is limited in the first groove.

[0018] An oil baffle is provided below the upper bearing, and / or an oil baffle is provided above the lower bearing. The oil baffle (310) is a contact sealing ring and is provided outside the grooves of the inner and outer rings of the bearing.

[0019] The embodiments of the present application provide a vertical transmission assembly for an air cooler axial flow fan, which has at least the following beneficial effects:

[0020] In order to enhance the stability of the bearing connection and avoid gaps or component sliding under working loads, this application also provides a wave spring on the outer ring of the deep groove ball bearing to provide preload for the bearing, reduce friction and wear during relative movement between the bearing and the main shaft, effectively withstand high-load axial forces, reduce bearing temperature rise, and increase bearing life. It has the advantages of simple structure and stable and reliable operation.

[0021] In order to further reduce the abnormal noise generated by the vertical transmission assembly during the transmission process, an O-ring is further provided between the outer ring of the upper bearing and / or the lower bearing and the inner wall of the transmission box to provide friction resistance between the upper bearing and the inner wall of the transmission box, thereby preventing the outer ring of the upper bearing from moving relative to the inner wall of the transmission box during the rotation of the main shaft, thereby avoiding abnormal noise caused by relative movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 、 Figure 2 This is a schematic structural diagram of a vertical transmission assembly for an axial flow fan of an air cooler in this application at different viewing angles;

[0023] Figure 3 For the Figure 2 Schematic diagram of half section in the AA direction;

[0024] Figure 4 for Figure 3 A partial enlarged schematic diagram of point A in the middle;

[0025] Figure 5 for Figure 3 A partial enlarged schematic diagram of point B in the middle.

[0026] Numbers in the figure

[0027] 1-main shaft; 2-transmission box; 21-upper oil filling hole; 22-lower oil filling hole; 3-first deep groove ball bearing; 41-upper end cover; 42-lower end cover; 5-second deep groove ball bearing; 6-one-way thrust ball bearing; 7-retaining ring;

[0028] 201 - first groove; 202 - second groove; 301 - first wave spring; 302 - pressure plate; 303 - retaining spring; 304 - O-ring; 305 - second wave spring; 310 - oil baffle. DETAILED DESCRIPTION

[0029] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0030] In addition, for ease of understanding, various components in the drawings are enlarged (thickened) or reduced (thinned), but this practice is not intended to limit the scope of protection of this application.

[0031] Words importing the singular include the plural and vice versa.

[0032] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, they are only for the convenience of describing the present application 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 a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance. Their names may be different in the detailed description and claims of the present application.

[0033] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0034] like Figures 1 to 5 As shown, a vertical transmission assembly for an axial flow fan of an air cooler includes a main shaft 1, a transmission box 2, an upper bearing, a lower bearing, an upper end cover 41 and a lower end cover 42, wherein one end of the main shaft 1 is connected to the impeller assembly, and the other end is connected to the rotating shaft of the motor through a driven pulley assembly. Under the action of the driven pulley assembly, the motor transmits driving force to the vertical transmission assembly, and the vertical transmission assembly drives the impeller assembly to rotate, thereby providing cooling air for the fin tube bundle.

[0035] Specifically, the upper end cover 41 and the lower end cover 42 are respectively connected to the two ends of the transmission box 2. The transmission box 2 contains an upper bearing and a lower bearing, which are respectively located at the top and bottom of the transmission box 2. The upper bearing is a first deep groove ball bearing 3, and the lower bearing is a combination of a second deep groove ball bearing 5 and a one-way thrust ball bearing 6.

[0036] A second wave spring 305 is also provided between the first deep groove ball bearing 3 and the upper end cover 41; and / or an elastic pre-tightening component is also provided above the second deep groove ball bearing 5, and the pre-tightening component is sleeved on the outside of the main shaft 1 and is limited by the inner wall of the transmission box 2 and connected to the top of the second deep groove ball bearing 5, so as to provide a pre-tightening force for the bearing to prevent the bearing from slipping due to load during the transmission process.

[0037] It should be noted that the present application changes the traditional transmission mode of using angular contact bearings in pairs. Due to the addition of the one-way thrust ball bearing 6, the axial load bearing capacity of the transmission box 2 can be greatly improved. At the same time, the second deep groove ball bearing 5 ensures its radial load bearing capacity, which solves the problem that the lower bearing of the traditional air cooler fan transmission box is a single double-row self-aligning bearing, which is difficult to refuel and easy to be damaged, and the axial load bearing capacity is relatively small. Since this bearing combination has a higher overall cost-effectiveness and is cheaper, it also greatly reduces the production cost.

[0038] In some preferred embodiments, in order to enhance the stability of the upper bearing connection and avoid gaps or component sliding under working loads, so that it can also achieve the use effect of an angular contact bearing, a second wave spring 305 is arranged between the first deep groove ball bearing 3 and the upper end cover 41. The second wave spring 305 is connected to the outer ring of the first deep groove ball bearing 3, and is used to provide a preload force for the outer ring of the first deep groove ball bearing 3, thereby reducing friction and wear during relative movement between the bearing and the main shaft, and extending the service life.

[0039] Accordingly, in order to enhance the stability of the lower bearing connection and avoid gaps or component sliding under working load, so that it can also achieve the use effect of angular contact bearings, an elastic pre-tightening component is provided above the second deep groove ball bearing 5. The pre-tightening component is sleeved on the outside of the main shaft 1 and is limitatively connected to the top of the second deep groove ball bearing 5. The pre-tightening component is used to provide a pre-tightening force for the outer ring of the second deep groove ball bearing 5, thereby reducing friction and wear during relative movement between the bearing and the main shaft, and extending the service life.

[0040] Specifically, a skeleton oil seal is used to seal the upper end cover 41 and the main shaft 1 , and the second wave spring 305 is connected between the first deep groove ball bearing 3 and the upper end cover 41 .

[0041] In some preferred embodiments, the second wave spring 305 is a wave-shaped elastic structure arranged in a ring shape along the circumference of the main shaft 1, which is used to improve the rigidity and rotation accuracy of the bearing, while suppressing noise and vibration, reducing the wear of the bearing rolling elements, and preventing abrasion caused by external vibration.

[0042] It should be added that, in the bearing system, the installation position of the wave spring is usually between the bearing and the end cover. This is because the wave spring can provide axial preload, which is crucial for improving the rigidity and rotation accuracy of the bearing. In order to make the lower bearing also have higher rigidity and rotation accuracy, this embodiment also provides a wave spring at the top of the lower bearing. However, since the top of the lower bearing lacks a structure to limit the position of the wave spring, in this embodiment, the wave spring at the top of the lower bearing is additionally equipped with components such as a retaining spring, so that they together constitute a preload assembly.

[0043] Specifically, the preload assembly includes a first wave spring 301 and a retaining spring 303 arranged axially from bottom to top. The inner wall of the lower part of the transmission box 2 is provided with a first groove 201 arranged along its circumference. The retaining spring 303 is limited to the first groove 201. The first wave spring 301 is limited to the gap between the retaining spring 303 and the second deep groove ball bearing 5, and is used to provide better preload force for the second deep groove ball bearing 5.

[0044] In some preferred embodiments, the first wave spring 301 is a wave-shaped elastic structure arranged in a ring shape along the circumference of the main shaft 1, which is used to improve the rigidity and rotation accuracy of the bearing, while suppressing noise and vibration, reducing the wear of the bearing rolling elements, and preventing abrasion caused by external vibration.

[0045] In some preferred embodiments, the pre-tightening assembly also includes a pressure plate 302, which is an annular cover-like structure with a downwardly convex outer edge. The inner edge of the pressure plate 302 cooperates with the main shaft 1, and the first wave spring 301 is arranged between the outer edge of the pressure plate 302 and the outer ring of the second deep groove ball bearing 5. The annular cap structure of the pressure plate 302 can provide a better elastic deformation space for the first wave spring 301, enhance the stability of the connection, and effectively reduce the occurrence of gaps or component sliding under working load.

[0046] Obviously, when a pressure plate 302 is provided, the oil baffle plate 310 may not be provided. This is because the inner edge of the pressure plate 302 cooperates with the main shaft 1, and the outer edge of the pressure plate 302 cooperates with the inner wall of the transmission box 2. The pressure plate 302 can provide a relatively sealed space for the second bearing to prevent grease from entering the area outside the bearing chamber of the lower bearing. At this time, the oil baffle plate 310 may not be provided to reduce structural redundancy.

[0047] It should be added that, compared with the method of connecting the oil baffle plate 310 to the inner wall of the transmission box 2, this solution does not need to set the inner wall of the transmission box 2 as a large and small diameter structure for limiting the installation position of the oil baffle plate 310, thereby improving the processing efficiency and product quality of the transmission box 2, and effectively avoiding the transmission abnormal noise caused by coaxiality problems after the main shaft 1 is placed in the transmission box 2.

[0048] In some preferred embodiments, an oil baffle 310 is provided below the first deep groove ball bearing 3. The oil baffle 310 is connected between the inner and outer rings of the lower part of the first deep groove ball bearing 3 to prevent grease from entering the area outside the bearing chamber of the upper bearing.

[0049] In some preferred embodiments, the oil deflector plate 310 is a contact sealing ring, and the oil deflector plate 310 is arranged outside the grooves of the inner ring and outer ring of the bearing. Since the oil deflector plate 310 is wrapped around the outside of the grooves of the inner ring and outer ring of the bearing, the grease between the inner ring and outer ring of the bearing can be better wrapped and sealed, and the structure is like an oil seal, and the sealing effect is better.

[0050] In some preferred embodiments, a skeleton oil seal is used between the lower end cover 42 and the main shaft 1 to effectively prevent grease from entering the area outside the bearing chamber of the lower bearing.

[0051] In some preferred embodiments, the transmission case 2 is provided with an upper oiling hole 21 and a lower oiling hole 22, located at corresponding positions on the upper and lower bearings, respectively. The upper and lower oiling holes 21 and 22 are connected to external oiling cups via oil pipes. The upper and lower bearings are lubricated via the upper and lower oiling holes 21 and 22. The oil deflector 310 and the oil deflector 310 effectively prevent grease from entering areas outside the corresponding bearing chambers of the upper and lower bearings, preventing lubrication loss and waste that could cause oil starvation in the bearings, leading to poor lubrication, increased bearing temperature, and even burnout.

[0052] In order to further reduce abnormal noise generated by the vertical transmission assembly during transmission, an O-ring 304 is further provided between the outer ring of the upper bearing and / or the lower bearing and the inner wall of the transmission box 2 .

[0053] In some preferred embodiments, Figure 5 As shown, the inner wall of the upper part of the transmission box 2 is provided with a second groove 202 arranged along its circumference. The O-ring 304 is accommodated in the second groove 202 and contacts the outer ring of the upper bearing, which is used to provide friction resistance between the upper bearing and the inner wall of the transmission box 2 to prevent the outer ring of the upper bearing from moving relative to the inner wall of the transmission box 2 during the rotation of the main shaft 1, thereby avoiding abnormal noise caused by relative movement.

[0054] In some preferred embodiments, there are two second grooves 202, and the two second grooves 202 are respectively located at the upper and lower parts of the end faces where the inner wall of the transmission box 2 and the outer wall of the first deep groove ball bearing 3 match. The two second grooves 202 respectively accommodate the O-rings 304, and each of the O-rings 304 contacts the outer ring of the first deep groove ball bearing 3, so as to increase the friction resistance of the outer ring of the first deep groove ball bearing 3 relative to the inner wall of the transmission box 2.

[0055] Of course, the number of the second grooves 202 is not limited here, and may be three, four, etc., according to actual needs.

[0056] Correspondingly, an O-ring 304 may also be provided between the outer ring of the lower bearing and the inner wall of the transmission box 2. This is only because in actual use of the present application, the lower end of the main shaft 1 is connected to a transversely arranged transmission belt, and the transmission belt applies a pulling force toward the inner wall of the transmission box 2 to the main shaft 1 during the transmission process, which increases the pressure between the outer ring of the lower bearing and the inner wall of the transmission box 2, thereby increasing the friction resistance of the relative movement between the outer ring of the lower bearing and the inner wall of the transmission box 2, resulting in no abnormal noise generated by the relative movement between the outer ring of the lower bearing and the inner wall of the transmission box 2.

[0057] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A vertical transmission assembly for an axial flow fan of an air cooler, comprising a main shaft (1), a transmission box (2), an upper bearing, a lower bearing, an upper end cover (41) and a lower end cover (42), wherein the upper end cover (41) and the lower end cover (42) are respectively connected to the two ends of the transmission box (2), the upper bearing and the lower bearing are respectively accommodated in the interior of the transmission box (2), and the upper bearing and the lower bearing are respectively located at the top and the bottom of the transmission box (2), characterized in that: The inner wall of the transmission box (2) is a constant diameter inner wall, the upper bearing is a first deep groove ball bearing (3), the lower bearing is a combination of a second deep groove ball bearing (5) and a one-way thrust ball bearing (6), and an O-ring (304) is further connected between the outer ring of the upper bearing and / or the lower bearing and the inner wall of the transmission box (2); A second wave spring (305) is further provided between the first deep groove ball bearing (3) and the upper end cover (41); and / or an elastic pre-tightening component is further provided above the second deep groove ball bearing (5), the pre-tightening component being sleeved on the outside of the main shaft (1) and being position-limited by the inner wall of the transmission box (2) and connected to the top of the second deep groove ball bearing (5).

2. The vertical transmission assembly for the air cooler axial flow fan according to claim 1, characterized in that: The inner wall of the upper portion of the transmission box (2) is provided with a second groove (202) arranged along its circumference; the O-ring (304) is accommodated in the second groove (202) and contacts the outer ring of the upper bearing.

3. The vertical transmission assembly for the air cooler axial flow fan according to claim 1, characterized in that: The second wave spring (305) is connected between the outer ring of the first deep groove ball bearing (3) and the upper end cover (41).

4. The vertical transmission assembly for an air cooler axial flow fan according to claim 1, characterized in that: The second wave spring (305) is a wave-shaped elastic structure arranged in a ring shape along the circumference of the main shaft (1).

5. The vertical transmission assembly for the air cooler axial flow fan according to claim 1, characterized in that: The pre-tightening assembly comprises a first wave spring (301) and a retaining spring (303), wherein the retaining spring (303) is limited by the inner wall of the transmission box (2); The first wave spring (301) is limited to a gap between the retaining spring (303) and the second deep groove ball bearing (5).

6. The vertical transmission assembly for the air cooler axial flow fan according to claim 5, characterized in that: The first wave spring (301) and / or the second wave spring (305) are wave-shaped elastic structures arranged in an annular shape along the circumference of the main shaft (1).

7. The vertical transmission assembly for the air cooler axial flow fan according to claim 5, characterized in that: The pre-tightening assembly further comprises a pressure plate (302), the inner edge of the pressure plate (302) cooperates with the main shaft (1), the outer edge of the pressure plate (302) cooperates with the inner wall of the transmission box (2), and the pressure plate (302) is accommodated in the gap between the retaining spring (303) and the top of the lower bearing.

8. The vertical transmission assembly for the air cooler axial flow fan according to claim 7, characterized in that: The pressure plate (302) is an annular cover-shaped structure with a downwardly convex outer edge, and the first wave spring (301) is arranged between the outer edge of the pressure plate (302) and the outer ring of the second deep groove ball bearing (5).

9. The vertical transmission assembly for an air cooler axial flow fan according to claim 5, characterized in that: The inner wall of the lower portion of the transmission box (2) is provided with a first groove (201) arranged along its circumference, and the clamping spring (303) is limited in the first groove (201).

10. The vertical transmission assembly for an axial flow fan for an air cooler according to claim 1, characterized in that: An oil baffle (310) is provided below the upper bearing, and / or an oil baffle (310) is provided above the lower bearing. The oil baffle (310) is a contact sealing ring and is provided outside the grooves of the inner ring and outer ring of the bearing.

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