Air-cooled heat exchanger
By employing a combination structure of coupling, drive shaft, and dual bearings in the air-cooled heat exchanger, the problem of reduced bearing capacity and lifespan under axial loads is solved, achieving high-efficiency bearing capacity and extended service life.
Patent Information
- Application Number
- CN202520381810.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-06
AI Technical Summary
In existing air-cooled heat exchangers, the direct connection between the motor and the fan blades leads to a reduction in the bearing capacity and service life under axial loads.
The connection structure adopts a coupling, drive shaft, bearing assembly and bearing housing, including a first bearing and a second bearing. The coupling is selected as a plum blossom coupling. The bearing assembly is designed with angular contact ball bearings and double row angular contact ball bearings, which can simultaneously withstand axial and radial loads. The coupling is damaged first to protect other components and extend service life.
It significantly improves the bearing's load-bearing capacity, distributes the load, reduces wear, extends service life, and reduces the risk of damage to air-cooled heat exchangers.
Smart Images
Figure CN223940030U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange equipment structure, and more specifically to an air-cooled heat exchanger. Background Technology
[0002] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements. It is also one of the key devices for improving energy efficiency. Air-cooled heat exchangers use air as a coolant and can be used as both a cooler and a condenser. An air-cooled heat exchanger mainly consists of a tube bundle, a support frame, and a fan. The fluid flows inside the tube bundle, while air introduced by the fan blows across the outside of the tube bundle.
[0003] Because the air volume required for heat exchange is large and the air pressure is not high, air-cooled heat exchangers mostly use axial flow fans. That is, the gas is forced to flow axially by the thrust of the blades. When the motor drives the impeller to rotate in the casing, a certain installation angle between the shaft and the propeller blades generates a thrust on the gas, pushing the gas to flow continuously along the shaft direction, so that the gas is continuously drawn in and discharged.
[0004] Existing air-cooled heat exchanger fans typically have blades directly connected to the motor shaft, forming a rigid connection structure. When the blades rotate at high speeds, they generate significant torque. When the bearings are subjected to axial loads, this leads to a reduction in the bearing's load-bearing capacity and service life. Therefore, it is necessary to improve existing air-cooled heat exchangers to address these issues. Utility Model Content
[0005] The purpose of this utility model is to disclose an air-cooled heat exchanger to solve the problem in the prior art where the bearing capacity and service life of the bearing are reduced when the motor and fan blades are directly connected and the bearing is subjected to axial load.
[0006] To achieve the above objectives, this utility model provides an air-cooled heat exchanger, comprising: an air-cooling device and a heat exchange tube bundle, wherein the air-cooling device includes a drive motor and a cooling fan blade, the heat exchange tube bundle is coiled around the cooling fan blade, and the drive end of the drive motor is connected to the cooling fan blade through a connecting component.
[0007] The connecting components include: a coupling, a drive shaft, a bearing assembly, and a bearing housing. The drive end of the drive motor and the drive shaft are connected by the coupling. The cooling fan blades are connected to the drive shaft. The bearing assembly includes a first bearing and a second bearing. The drive shaft is axially mounted in the bearing housing via the first bearing and the second bearing and is rotatably connected to the bearing housing.
[0008] As a further improvement of this utility model, it also includes: a protective cover, the protective cover being cylindrical in shape, the heat exchange tube bundle being disposed inside the protective cover, the heat exchange tube bundle having an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe being passed through the protective cover, and the protective cover having several through holes.
[0009] As a further improvement of this utility model, a transition flange is assembled at the top of the protective cover, the transition flange is coaxially arranged with the protective cover, the bearing seat is arranged inside the protective cover and coaxially assembled to the lower surface of the transition flange through a connector, and a bell-shaped cover for mounting the drive motor is coaxially assembled on the upper surface of the transition flange.
[0010] As a further improvement of this utility model, the first bearing is selected as an angular contact ball bearing, the second bearing is selected as a double row angular contact ball bearing, the second bearing is located in the bearing housing and disposed below the first bearing, the connecting component also includes a bearing end cover, the bearing end cover is assembled to the lower surface of the bearing housing through a connecting member and abuts against the second bearing, and the drive shaft passes through the bearing end cover to exit the bearing housing.
[0011] As a further improvement of this utility model, the coupling is optionally equipped as a plum blossom coupling, and the coupling connects the drive end of the drive motor and the transmission shaft through a flat key.
[0012] As a further improvement of this utility model, the transmission shaft passes through the bearing housing to form a positioning section, and the edge of the positioning section forms a positioning protrusion on the surface of the transmission shaft. The first bearing and the second bearing are assembled on the upper and lower sides of the positioning section and fit against the upper and lower surfaces of the positioning protrusion. The first bearing and the second bearing are respectively positioned in the bearing housing by snap rings.
[0013] As a further improvement of this utility model, the bearing end cover forms a clearance opening for the drive shaft to pass through, and an elastic sealing ring is installed at the clearance opening, the elastic sealing ring being fitted to the edge of the drive shaft.
[0014] As a further improvement of this utility model, the protective cover has a top plate and a base mounted on the upper and lower sides, the transition flange is connected to the upper surface of the top plate, the liquid inlet pipe of the heat exchange tube bundle passes through the protective cover near the top plate, and the liquid outlet pipe of the heat exchange tube bundle passes through the protective cover near the base.
[0015] As a further improvement of this utility model, the cooling fan blade is configured as a cylindrical hollow part with several ventilation openings along the height direction, the drive shaft is arranged axially inside the cooling fan blade, and an integrally formed assembly plate is inside the cooling fan blade, the assembly plate being connected to the bottom end of the drive shaft.
[0016] As a further improvement of this utility model, the assembly plate forms a connecting hole in the center, the drive shaft is inserted into the connecting hole, and the side of the assembly plate away from the drive shaft is provided with a pressure cap covering the connecting hole, and the pressure cap is fixed to the drive shaft by a connector.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: The air-cooled heat exchanger includes an air-cooling device and a heat exchange tube bundle. The air-cooling device includes a drive motor and cooling fan blades, and the heat exchange tube bundle is coiled around the cooling fan blades. The drive end of the drive motor is connected to the cooling fan blades through a connecting component. When it is necessary to cool the fluid, the fluid is introduced into the heat exchange tube bundle, and the drive end of the drive motor drives the cooling fan blades to rotate, thereby achieving the purpose of cooling and heat exchange of the fluid flowing in the heat exchange tube bundle surrounding the cooling fan blades. Furthermore, the connecting component includes a coupling, a drive shaft, a bearing assembly, and a bearing housing, and the bearing assembly includes a first bearing and a second bearing arranged vertically. The coupling is selected as a perforated coupling. When a fault occurs during the rotation of the drive end of the drive motor, the coupling will be damaged first due to excessive torque, thereby preventing further damage to other components of the connecting component. Furthermore, the bearing assembly consisting of the first and second bearings can simultaneously withstand the combined load of axial and radial loads generated by the drive shaft during operation, thereby avoiding the problem of reduced load-bearing capacity and service life of the air-cooled heat exchanger. Attached Figure Description
[0018] Figure 1 This is a schematic diagram illustrating the overall structure of the air-cooled heat exchanger of this utility model;
[0019] Figure 2 for Figure 1 Schematic diagram of cross section along the FF direction;
[0020] Figure 3 for Figure 2 Enlarged view of section A in the middle;
[0021] Figure 4 This is a partial schematic diagram illustrating the assembly relationship between the drive shaft and the bearing housing in this utility model;
[0022] Figure 5 for Figure 2 Enlarged view of section B in the middle. Detailed Implementation
[0023] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.
[0024] It should be understood that in this application, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this technical solution 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. Therefore, it should not be construed as a limitation to this technical solution.
[0025] As shown Figures 1 to 5 in the figure, a kind of air-cooled heat exchanger designed by the utility model includes an air-cooling device 1 and a heat exchange tube bundle 2. Among them, the air-cooling device 1 includes a driving motor 11 and a cooling fan blade 12, and the heat exchange tube bundle 2 is arranged around the cooling fan blade disc 12. The driving end of the driving motor 11 is connected to the cooling fan blade 12 through a connecting component 3. When it is necessary to cool down the fluid, the fluid is passed into the heat exchange tube bundle 2, and the driving end of the driving motor 11 is used to drive the cooling fan blade 12 to rotate so as to achieve the purpose of cooling and heat exchange for the fluid flowing in the heat exchange tube bundle 2 arranged around the cooling fan blade 12. Further, the connecting component 3 includes a coupling 31, a transmission shaft 32, a bearing group 33 and a bearing seat 34, and the bearing group includes a first bearing 331 and a second bearing 332 arranged up and down. The coupling 31 is selected as a plum blossom coupling. When a fault occurs during the rotation of the driving end of the driving motor 11, the coupling 31 is damaged first, thereby avoiding further damage to other devices of the connecting component 3. And, the bearing group 33 composed of the first bearing 331 and the second bearing 332 can simultaneously bear the combined load of the axial load and the radial load generated by the transmission shaft 32 during operation, thereby somewhat avoiding the problems of reduced bearing capacity and service life of the air-cooled heat exchanger due to excessive load.
[0026] As shown Figures 1 to 5 in the figure, a specific implementation manner of the air-cooled heat exchanger in the utility model includes: an air-cooling device 1 and a heat exchange tube bundle 2. The air-cooling device 1 includes a driving motor 11 and a cooling fan blade 12. The heat exchange tube bundle 2 is arranged around the cooling fan blade 12 in a coiled manner. The driving end of the driving motor 11 is connected to the cooling fan blade 123 through a connecting component 3. The connecting component 3 includes: a coupling 31, a transmission shaft 32, a bearing group 33 and a bearing seat 34. The driving end of the driving motor 11 and the transmission shaft 32 are connected through the coupling 31. The cooling fan blade 12 is connected to the transmission shaft 32. The bearing group 3 includes a first bearing 331 and a second bearing 332. The transmission shaft 32 is axially assembled in the bearing seat 34 through the first bearing 331 and the second bearing 332 and is rotatably connected to the bearing seat 34.
[0027] As shown Figures 2 to 4As shown, the first bearing 331 is selected as an angular contact ball bearing, and the second bearing 332 is selected as a double-row angular contact ball bearing. The second bearing 332 is located inside the bearing housing 34 and below the first bearing 331. The connecting component 3 further includes a bearing end cover 35. The bearing end cover 35 is assembled to the lower surface of the bearing housing 34 through a connecting member 46 and abuts against the second bearing 332. The transmission shaft 32 passes through the bearing end cover 35 to pass out of the bearing housing 34. The coupling 31 is selected as a diaphragm coupling. The coupling 31 is connected to the driving end of the driving motor and the transmission shaft 32 through a flat key 321. Specifically, the driving end of the driving motor 11 is the terminal it has. The part of the transmission shaft 32 disposed inside the bearing housing 34 forms a positioning section 322. The edge of the positioning section 322 forms a positioning protrusion 323 on the surface of the transmission shaft 32. The first bearing 331 and the second bearing 332 are assembled on the upper and lower sides of the positioning section 322 and are in contact with the upper and lower surfaces of the positioning protrusion 323. The first bearing 331 and the second bearing 332 are respectively positioned inside the bearing housing 34 through snap rings 324. The bearing end cover 35 forms a relief opening 351 for the transmission shaft 32 to pass through. An elastic sealing ring 352 is installed at the relief opening 351. The elastic sealing ring 352 is in contact with the edge of the transmission shaft 32.
[0028] A dual-bearing structure is formed by the bearing group �³ composed of the first bearing 331 and the second bearing 332 arranged axially up and down. Compared with a single bearing, the structural design of the dual bearing can bear radial and axial loads simultaneously, significantly increasing the bearing capacity of the bearing. Moreover, the design of the dual bearing can effectively disperse the load, reduce the burden on a single bearing, thereby reducing wear and achieving the effect of extending the service life of the bearing group, and further effectively reducing the problem that the air-cooling device 2 is easily damaged due to the large load that a single bearing needs to bear. Further, in this embodiment, the first bearing 331 and the second bearing 332 are respectively selected as an angular contact ball bearing and a double-row angular contact bearing. Among them, the second bearing 332 selected as a double-row angular contact bearing can bear a combined radial and axial load and a moment load mainly composed of a large radial load. In this embodiment, it can limit the displacement of the transmission shaft 32 in two directions, further improving the overall service life of the air-cooling device 3.
[0029] Refer Figures 1 to 5As shown, the air-cooled heat exchanger further includes a protective cover 4, which is formed in a cylindrical shape. The heat exchange tube bundle 2 is disposed inside the protective cover 4. The heat exchange tube bundle 2 has a liquid inlet pipe 21 and a liquid outlet pipe 22, and the liquid inlet pipe 21 and the liquid outlet pipe 22 penetrate out of the protective cover 4. The protective cover 4 has a number of through holes 41. The top end of the protective cover 4 is assembled with a transition flange 44 through a top plate 42. The transition flange 44 is coaxially arranged with the protective cover 4. The bearing seat 34 is disposed inside the protective cover 4 and is coaxially assembled on the lower surface of the transition flange 44 through a connecting member 46. A bell-shaped cover 45 for installing the driving motor 11 is coaxially assembled on the upper surface of the transition flange 44. The protective cover 4 also has a base 43 assembled at the bottom. The liquid inlet pipe 21 of the heat exchange tube bundle 2 penetrates out of the protective cover 4 near the top plate 42, and the liquid outlet pipe 22 of the heat exchange tube bundle 2 penetrates out of the protective cover 4 near the base 43.
[0030] It should be noted that in this embodiment, the driving motor 11 is assembled along the direction of the rotor vertically downward. The end face of the driving motor 11 is connected to the bell-shaped cover 45 in a flange connection manner and is fixed to the coupling 31 through a flat key 321. The coupling 31 passes through the transition flange 44 and is fixed to the transmission shaft 32 through a flat key 321. The transmission shaft 32 is sequentially fixed to the inner rings of the first bearing 331 and the second bearing 332 and then connected to the cooling fan blade 12. And the transmission shaft 32 contacts with an elastic sealing ring 352 at a position where it passes through the bearing end cover 35 and at a relief opening 351 formed in the bearing end cover 35. First, the coupling 31 is specifically selected as a plum coupling. When the driving motor 11 has an operating failure, the coupling 31 will be damaged immediately, avoiding damage to the transmission shaft 32 and the first bearing 331 and the second bearing 332 due to large loads, further extending the overall service life of the air-cooled heat exchanger and reducing the risk of its damage. Second, the transmission shaft 32 is formed with a positioning section 321, and the first bearing 331 and the second bearing 332 are positioned at a positioning protrusion 323 formed by the positioning section 321 through a snap ring 324, achieving the purpose of axially limiting the first bearing 331 and the second bearing 332. Finally, the design of the elastic sealing ring 352 at the relief opening 351 formed in the bearing end cover 35, and the elastic sealing ring 352 is specifically selected as a lip seal, so as to form a sealed dust-proof space inside the bell-shaped cover 45 and the connecting component 3 as a whole, further extending the overall service life of the air-cooled heat exchanger.
[0031] Refer Figure 2 and Figure 3As shown, the cooling fan blade 12 is a cylindrical hollow component with several ventilation openings 121 along its height. The drive shaft 31 is axially disposed inside the cooling fan blade 12. An integrally formed assembly plate 122 is located inside the cooling fan blade 12, and the assembly plate 122 is connected to the bottom end of the drive shaft 32. A connecting hole 123 is formed in the center of the assembly plate 122, and the drive shaft 32 is inserted into the connecting hole 123. A pressure cap 124 covering the connecting hole 123 is provided on the side of the assembly plate 122 away from the drive shaft. The pressure cap 124 is fixed to the drive shaft 32 by a connector 46.
[0032] It should be noted that, in conjunction with the aforementioned records and appendices... Figure 2 As can be seen, the heat exchange tube bundle 2 is a tube spirally wound inside the protective cover 4. Therefore, in this embodiment, the cooling fan blade 12, which is formed as a cylindrical hollow component, can achieve the best cooling effect on the heat exchange tube bundle 2 in the height direction. That is, when the drive motor 11 is started, the transmission shaft 32 drives the cooling fan blade 12 to rotate, and the air flows in the vent 121 formed in the cooling fan blade 12 to achieve high-speed flow, thereby cooling and exchanging heat with the fluid flowing into the heat exchange tube bundle 2 through the liquid inlet pipe 21. Furthermore, the air whose temperature has increased after heat exchange is exchanged with the outside air through the through hole 41 formed in the protective cover 4, thereby improving the heat exchange efficiency of the air-cooled heat exchanger. Specifically, in this embodiment, the above-mentioned connecting parts 46 are all selected as bolts used in conjunction with spring washers (not labeled) to reduce the operating noise of the drive motor 11 to a certain extent.
[0033] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.
[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An air-cooled heat exchanger, characterized in that, include: The air-cooling device and heat exchange tube bundle are provided. The air-cooling device includes a drive motor and cooling fan blades. The heat exchange tube bundle is coiled around the cooling fan blades. The drive end of the drive motor is connected to the cooling fan blades through a connecting component. The connecting components include: a coupling, a drive shaft, a bearing assembly, and a bearing housing. The drive end of the drive motor and the drive shaft are connected by the coupling. The cooling fan blades are connected to the drive shaft. The bearing assembly includes a first bearing and a second bearing. The drive shaft is axially mounted in the bearing housing via the first bearing and the second bearing and is rotatably connected to the bearing housing.
2. The air-cooled heat exchanger according to claim 1, characterized in that, Also includes: A protective cover is formed in a cylindrical shape. The heat exchange tube bundle is disposed inside the protective cover. The heat exchange tube bundle has a liquid inlet pipe and a liquid outlet pipe, which are passed through the protective cover. The protective cover has several through holes.
3. The air-cooled heat exchanger according to claim 2, characterized in that, The top of the protective cover is fitted with a transition flange, which is coaxially arranged with the protective cover. The bearing seat is located inside the protective cover and is coaxially fitted to the lower surface of the transition flange through a connector. The upper surface of the transition flange is coaxially fitted with a bell-shaped cover for mounting the drive motor.
4. The air-cooled heat exchanger according to claim 1, characterized in that, The first bearing is selected as an angular contact ball bearing, and the second bearing is selected as a double row angular contact ball bearing. The second bearing is located in the bearing housing and is disposed below the first bearing. The connecting component also includes a bearing end cover. The bearing end cover is assembled to the lower surface of the bearing housing through a connector and abuts against the second bearing. The drive shaft passes through the bearing end cover and exits the bearing housing.
5. The air-cooled heat exchanger according to claim 4, characterized in that, The coupling is selected as a plum blossom coupling, and the coupling connects the drive end of the drive motor and the transmission shaft via a flat key.
6. The air-cooled heat exchanger according to claim 4, characterized in that, The drive shaft passes through the bearing housing to form a positioning section. The edge of the positioning section forms a positioning protrusion on the surface of the drive shaft. The first bearing and the second bearing are assembled on the upper and lower sides of the positioning section and fit against the upper and lower surfaces of the positioning protrusion. The first bearing and the second bearing are respectively positioned in the bearing housing by snap rings.
7. The air-cooled heat exchanger according to claim 6, characterized in that, The bearing end cap forms a clearance opening for the drive shaft to pass through, and an elastic sealing ring is installed at the clearance opening, the elastic sealing ring fitting against the edge of the drive shaft.
8. The air-cooled heat exchanger according to claim 3, characterized in that, The protective cover has a top plate and a base mounted on the upper and lower sides. The transition flange is connected to the upper surface of the top plate. The liquid inlet pipe of the heat exchange tube bundle passes through the protective cover near the top plate, and the liquid outlet pipe of the heat exchange tube bundle passes through the protective cover near the base.
9. The air-cooled heat exchanger according to claim 1, characterized in that, The cooling fan blade is configured as a cylindrical hollow component with several ventilation openings along the height direction. The drive shaft is axially disposed inside the cooling fan blade. An integrally formed assembly plate is installed inside the cooling fan blade. The assembly plate is connected to the bottom end of the drive shaft.
10. The air-cooled heat exchanger according to claim 9, characterized in that, The assembly plate has a centrally located connecting hole, into which the drive shaft is inserted. The assembly plate has a pressure cap covering the connecting hole on the side away from the drive shaft, and the pressure cap is fixed to the drive shaft by a connector.