Split type screw pump
By independent of the synchronous transmission mechanism and using independently separated bearing and shaft seal components, combined with a variety of cooling methods and seal solutions, the heat dissipation, lubrication and sealing problems of the screw pump are solved, and the reliability and life of the pump are improved.
Patent Information
- Application Number
- CN202420661400.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The synchronous gears, bearings and shaft seal components of existing screw pumps are concentrated in the small cavity of the pump end cover, resulting in poor heat dissipation effect and poor sealing effect, which are prone to problems such as lubricant leakage and cooling coil scaling.
Design a split screw pump to separate the synchronous transmission mechanism, the bearing and shaft seal components are separated and lubricated with frame oil seal and grease, and a shaft end fan, cooling coil or external circulation oil pump is installed in the gear box. Add a heat exchanger for cooling, using mechanical seal or dry air seal.
It solves the problems of poor heat dissipation, lubricant leakage and cooling coil scaling, improves the reliability and life of the pump, and reduces jamming or wear failure caused by thermal expansion of the parts.
Smart Images
Figure CN222254336U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of screw pumps, in particular to a split screw pump. Background Art
[0002] Screw pumps can be divided into screw vacuum pumps and screw compressors according to different working conditions. The working principles and structures of the two are similar. Existing screw pumps generally design synchronous gears at the driving end or non-driving end of the rotor, and use synchronous gears to drive the rotor to rotate synchronously in the opposite direction. During the reverse rotation of the rotor, the internal space is separated by the rotor and flows from the suction port to the exhaust port as pushed by the screw, so the suction and exhaust functions can be achieved. Figure 1 It is a structural diagram of the prior art, such as Figure 1 As shown, since the gears need lubricating oil for lubrication when working, the screw pumps are designed with an oil tank 40 to wrap the synchronous gear 50, bearings and shaft seal components together, and use the lubricating oil to lubricate the synchronous gear 50, bearings and shaft seal components and cool the heat generated by them when working, while taking away part of the heat generated by the pump working time.
[0003] There are the following problems:
[0004] 1. The synchronous gears, bearings and shaft seal components are all concentrated in the small cavity of the pump end cover, and are lubricated and cooled by the lubricating oil in the end cover, resulting in poor heat dissipation of various parts and the pump itself when working. Various heats are mixed together, making it difficult to achieve rapid heat dissipation, which can easily cause high-temperature expansion, jamming or wear of parts.
[0005] 2. The shaft seal space is narrow and flushing can only rely on the lubricating oil in the oil tank, so the sealing effect is poor. Even if more than two sealing schemes are used, it is difficult to solve the sealing problem. If a mechanical seal is used to flush, lubricate and cool by splashing lubricating oil, it is difficult to meet the needs of normal operation and the mechanical seal is easily damaged. Therefore, when the screw pump is working, it is a common problem that the lubricating oil leaks into the suction system or the liquid in the gas leaks into the lubricating oil, causing the lubricating oil emulsification failure.
[0006] 3. The pump end cover is also the lubricating oil tank. Due to limited space, it can only be cooled by water-cooling coils, which may cause problems such as coil scaling and blockage or interface leakage. Summary of the invention
[0007] In order to overcome the defects of the above-mentioned prior art, the utility model proposes a split screw pump, which completely solves the operation failure caused by poor heat dissipation or lubrication and scaling of the cooling coil, completely solves the problem of lubricating oil leaking into the suction system or liquid in the gas leaking into the lubricating oil causing lubricating oil emulsification failure, and completely solves the problem of easy leakage of the shaft seal component during pump operation. The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0008] A split screw pump comprises a pump main unit and an auxiliary unit, wherein the auxiliary unit is independently placed on the side of the pump main unit, the pump main unit comprises a pump body, a driving rotor and a driven rotor, the driving rotor and the driven rotor are arranged in the pump body, the auxiliary unit comprises a synchronous transmission mechanism, the synchronous transmission mechanism is connected to the driving rotor through a first coupling, and the synchronous transmission mechanism is connected to the driven rotor through a second coupling; the synchronous transmission mechanism is a synchronous gear, and the synchronous gear is arranged in a gear box, the first driven shaft of the gear box is connected to the driving rotor through a first coupling, the second driven shaft of the gear box is connected to the driven rotor through a second coupling, the first driven shaft and the second driven shaft are connected through a synchronous gear, the driving shaft of the gear box is connected to a driving motor through a third coupling, and the driving shaft and the first driven shaft are connected through a speed change gear.
[0009] Furthermore, the driving shaft, the first driven shaft, the second driven shaft and the gear box are sealed by a first skeleton oil seal or an isolator.
[0010] Specifically, a first bearing is arranged at one end of the active rotor, a second bearing is arranged at the other end of the active rotor, a third bearing is arranged at one end of the driven rotor, and a fourth bearing is arranged at the other end of the driven rotor; the first bearing is fixedly connected to the front bearing cover and the front side cover through a first bearing seat, the second bearing is fixedly connected to the rear bearing cover and the rear side cover through a second bearing seat, the third bearing is fixedly connected to the front bearing cover and the front side cover through a third bearing seat, and the fourth bearing is fixedly connected to the rear bearing cover and the rear side cover through a fourth bearing seat.
[0011] Specifically, the second skeleton oil seal is used to seal between the first bearing and the first bearing seat, between the second bearing and the second bearing seat, between the third bearing and the third bearing seat, and between the fourth bearing and the fourth bearing seat.
[0012] In particular, the first bearing, the second bearing, the third bearing and the fourth bearing are all lubricated with grease.
[0013] In particular, a first shaft seal component is provided between the driving rotor and the front cover, a second shaft seal component is provided between the driving rotor and the rear cover, a third shaft seal component is provided between the driven rotor and the front cover, and a fourth shaft seal component is provided between the driven rotor and the rear cover.
[0014] In particular, a first partition area is formed between the front side cover and the first bearing seat, a second partition area is formed between the rear side cover and the second bearing seat, a third partition area is formed between the front side cover and the third bearing seat, and a fourth partition area is formed between the rear side cover and the fourth bearing seat.
[0015] The utility model not only completely solves the operation failures caused by poor heat dissipation or lubrication and scaling of the cooling coil, but also completely solves the problem of lubricating oil leaking into the suction system or liquid in the gas leaking into the lubricating oil causing lubricating oil emulsification failure, and completely solves the problem of easy leakage of shaft seal components during pump operation, and can also effectively reduce the failures caused by jamming or wear due to thermal expansion of parts, the product reliability is significantly improved, and the service life of the entire pump is greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the prior art;
[0017] Figure 2 It is a schematic diagram of the structure of the utility model;
[0018] Figure 3 This is a schematic diagram of the internal structure of the gearbox in Example 1;
[0019] Figure 4 Schematic diagram of the internal structure of the gearbox of Example 2. DETAILED DESCRIPTION
[0020] Embodiment 1
[0021] Figure 2 It is a schematic diagram of the structure of the utility model, such as Figure 2 As shown, a split screw pump includes a pump main unit and an auxiliary unit. The auxiliary unit is independent of the pump main unit and is placed on the side of the pump main unit. The pump main unit includes a pump body 1, a driving rotor 2, and a driven rotor 3. The driving rotor 2 and the driven rotor 3 are arranged in the pump body 1. The auxiliary unit includes a synchronous transmission mechanism. The synchronous transmission mechanism is connected to the driving rotor 2 through a first coupling 10, and the synchronous transmission mechanism is connected to the driven rotor 3 through a second coupling 12.
[0022] Figure 3 Schematic diagram of the internal structure of the gearbox in the first embodiment. Figure 3 As shown, the synchronous transmission mechanism of the first embodiment is a synchronous gear 8, which is arranged in a gear box 9. The driving shaft 11 of the gear box 9 is connected to the driving rotor 2 through a first coupling 10, and the driven shaft 13 of the gear box 9 is connected to the driven rotor 3 through a second coupling 12. The driving shaft 11 and the driven shaft 13 are connected through the synchronous gear 8, and the input end of the driving shaft 11 is connected to the drive motor 15 through a third coupling 14. Both ends of the driving shaft 11 and both ends of the driven shaft 13 are provided with bearings. The driving shaft 11, the driven shaft 13 and the gear box 9 are sealed by a skeleton oil seal or an isolator. The driving shaft 11, the driven shaft 13 and the gear box 9 of the first embodiment are sealed by a first skeleton oil seal 16; the synchronous transmission mechanism of the utility model can also be a synchronous pulley.
[0023] A first bearing 4 is arranged at one end of the active rotor 2, a second bearing 5 is arranged at the other end of the active rotor 2, a third bearing 6 is arranged at one end of the driven rotor 3, and a fourth bearing 7 is arranged at the other end of the driven rotor 3. The first bearing 4 is fixedly connected to the front bearing cover 22 and the front side cover 25 through a first bearing seat 18, the second bearing 5 is fixedly connected to the rear bearing cover 23 and the rear side cover 26 through a second bearing seat 19, the third bearing 6 is fixedly connected to the front bearing cover 22 and the front side cover 25 through a third bearing seat 20, and the fourth bearing 7 is fixedly connected to the rear bearing cover 23 and the rear side cover 26 through a fourth bearing seat 21.
[0024] The second skeleton oil seal 24 is used to seal the first bearing 4 and the first bearing seat 18, the second bearing 5 and the second bearing seat 19, the third bearing 6 and the third bearing seat 20, and the fourth bearing 7 and the fourth bearing seat 21. The outermost ends of the first bearing 4 and the third bearing 6 are sealed by the front bearing pressure cover 22 and the third skeleton oil seal 17, and the outermost ends of the second bearing 5 and the fourth bearing 7 are sealed by the rear bearing pressure cover 23. The first bearing 4, the second bearing 5, the third bearing 6 and the fourth bearing 7 are all lubricated with grease.
[0025] A first shaft seal component 27 is arranged between the active rotor 2 and the front side cover 25, a second shaft seal component 28 is arranged between the active rotor 2 and the rear side cover 26, a third shaft seal component 29 is arranged between the driven rotor 3 and the front side cover 25, and a fourth shaft seal component 30 is arranged between the driven rotor 3 and the rear side cover 26; a first partition area 31 is formed between the front side cover 25 and the first bearing seat 18, a second partition area 32 is formed between the rear side cover 26 and the second bearing seat 19, a third partition area 33 is formed between the front side cover 25 and the third bearing seat 20, and a fourth partition area 34 is formed between the rear side cover 26 and the fourth bearing seat 21; the first partition area 31, the second partition area 32, the third partition area 33 and the fourth partition area 34 are all free of lubricating oil or coolant.
[0026] The utility model separates the synchronous gear 8 that drives the rotor. After the synchronous gear is removed from the pump itself, the arrangement space of the bearing and the shaft seal components becomes larger, and the bearing and the shaft seal components are arranged independently and separately; the gear box 9 can be cooled by natural air, shaft end fan, cooling coil or external circulating oil pump plus heat exchanger, and the pump body 1 adopts mechanical seal or dry gas seal.
[0027] Embodiment 2
[0028] Figure 4 Schematic diagram of the internal structure of the gearbox in the second embodiment. Figure 4As shown, the synchronous transmission mechanism of the second embodiment is a synchronous gear 8, which is arranged in a gear box 9, the first driven shaft 35 of the gear box 9 is connected to the driving rotor 2 through the first coupling 10, the second driven shaft 36 of the gear box is connected to the driven rotor 3 through the second coupling 12, the first driven shaft 35 and the second driven shaft 36 are connected through the synchronous gear 8, the driving shaft 37 of the gear box is connected to the driving motor 15 through the third coupling 14, the driving shaft 37 and the first driven shaft 35 are connected through the speed change gear 38, and the two ends of the first driven shaft 35, the two ends of the second driven shaft 36 and the two ends of the driving shaft 37 are all provided with bearings, at this time, the output speed of the gear box is no longer synchronized with the motor, but becomes a speed change gear box; the driving shaft 37, the first driven shaft 35, the second driven shaft 36 and the gear box 9 are sealed by the first skeleton oil seal 16. The other settings of the second embodiment are the same as those of the first embodiment, and are not repeated here.
[0029] The advantages of the utility model are as follows:
[0030] 1. The independent gearbox can flexibly adopt the cooling methods of shaft end fan, cooling coil and external circulating oil pump plus heat exchanger. The cooling method is no longer limited and the appropriate cooling method can be selected according to the on-site working conditions. It completely solves the operation failures caused by poor heat dissipation or lubrication and scaling of cooling coil, and the product reliability is significantly improved.
[0031] 2. The bearings and shaft seal components are arranged in independent separation areas and are not connected to each other. Skeleton oil seals are used at both ends of the bearings and grease lubrication is changed. There is no lubricating oil at both ends of the intake air channel, which completely solves the problem of lubricating oil leaking into the intake system or liquid in the gas leaking into the lubricating oil, causing lubricating oil emulsification failure.
[0032] 3. Without the barrier of gears and oil tanks, both conventional mechanical seals and more advanced dry gas seals can be used, and the sealing and reliability of the pump have been greatly improved. In addition, different standard flushing solutions can be flexibly adopted, which completely solves the problem of easy leakage during pump operation.
[0033] 4. Since the gears, bearings and shaft seal components are arranged independently, the heat generated by the working of each part will not be mixed, and the heat dissipation space becomes larger. For example, when the gear box is cooled by a shaft end fan, the fan can also take away the heat generated by the screw pump when compressing the gas. Therefore, the heat dissipation effect of the entire pump is significantly improved, effectively reducing the failure of jamming or wear caused by thermal expansion of parts.
[0034] 5. The gearbox can be a synchronous gearbox or a variable speed gearbox with different structures. The speed ratio of the variable speed gear can be set according to the needs, so that different speeds can be output. That is, the speed of the screw pump can be adjusted according to the working conditions and is no longer limited by the motor speed. The configuration of the equipment is more flexible and can also ensure that the screw pump runs at a high-efficiency working speed.
[0035] In short, the utility model not only completely solves the operating failures caused by poor heat dissipation or lubrication and scaling of the cooling coil, but also completely solves the problem of lubricating oil leaking into the suction system or liquid in the gas leaking into the lubricating oil, causing lubricating oil emulsification failure. It also completely solves the problem of easy leakage of shaft seal components during pump operation, and can effectively reduce failures caused by jamming or wear due to thermal expansion of parts. The product reliability is significantly improved, and the life of the entire pump is greatly increased.
Claims
1. A split screw pump, characterized in that: The invention comprises a pump main machine and an auxiliary machine, wherein the auxiliary machine is placed on the side of the pump main machine independently of the pump main machine, the pump main machine comprises a pump body, a driving rotor and a driven rotor, the driving rotor and the driven rotor are arranged in the pump body, the auxiliary machine comprises a synchronous transmission mechanism, the synchronous transmission mechanism is a synchronous gear, the synchronous gear is arranged in a gear box, the first driven shaft of the gear box is connected to the driving rotor through a first coupling, the second driven shaft of the gear box is connected to the driven rotor through a second coupling, the first driven shaft and the second driven shaft are connected through the synchronous gear, the driving shaft of the gear box is connected to the driving motor through a third coupling, and the driving shaft and the first driven shaft are connected through a speed change gear.
2. The split screw pump according to claim 1, characterized in that: The driving shaft, the first driven shaft, the second driven shaft and the gear box are sealed by a first skeleton oil seal or an isolator.
3. The split screw pump according to claim 1, characterized in that: A first bearing is arranged at one end of the active rotor, a second bearing is arranged at the other end of the active rotor, a third bearing is arranged at one end of the driven rotor, and a fourth bearing is arranged at the other end of the driven rotor; the first bearing is fixedly connected to the front bearing cover and the front side cover through a first bearing seat, the second bearing is fixedly connected to the rear bearing cover and the rear side cover through a second bearing seat, the third bearing is fixedly connected to the front bearing cover and the front side cover through a third bearing seat, and the fourth bearing is fixedly connected to the rear bearing cover and the rear side cover through a fourth bearing seat.
4. The split screw pump according to claim 3 is characterized in that: The second skeleton oil seal is used to seal between the first bearing and the first bearing seat, between the second bearing and the second bearing seat, between the third bearing and the third bearing seat, and between the fourth bearing and the fourth bearing seat.
5. The split screw pump according to claim 3 is characterized in that: The first bearing, the second bearing, the third bearing and the fourth bearing are all lubricated with grease.
6. The split screw pump according to claim 1, characterized in that A first shaft seal component is arranged between the driving rotor and the front side cover, a second shaft seal component is arranged between the driving rotor and the rear side cover, a third shaft seal component is arranged between the driven rotor and the front side cover, and a fourth shaft seal component is arranged between the driven rotor and the rear side cover.
7. The split screw pump according to claim 6, characterized in that: A first partition area is formed between the front side cover and the first bearing seat, a second partition area is formed between the rear side cover and the second bearing seat, a third partition area is formed between the front side cover and the third bearing seat, and a fourth partition area is formed between the rear side cover and the fourth bearing seat.