Screw blower
By adopting a carbon ring sealing structure and a spiral sealing structure in the screw blower, the problem of unsatisfactory sealing effect of traditional skeleton oil sealing is solved, achieving more efficient sealing effect and easier processing of parts.
Patent Information
- Application Number
- CN202420188647.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-04-13
- Filing Date
- 2024-01-26
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-01-26
AI Technical Summary
In existing screw blowers, the oil sealing effect of the skeleton between the spindle and the end cap is not ideal, and the processing is difficult and the concentricity is high.
Carbon ring sealing structure and spiral sealing structure are used instead of the traditional skeleton oil seal. Two sealing structures are formed through sealing cover, carbon ring, press plate, elastic parts and spiral grooves and other components to improve the sealing effect of the main machine's shaft exit end.
It significantly improves the sealing effect of the out-axle end of the spiral blower main engine, reduces the difficulty of processing, and makes the required parts easier to obtain.
Smart Images
Figure CN223035250U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of blowers, and particularly to a screw blower. Background Art
[0002] As an important industrial equipment, screw blowers are widely used in sewage treatment, cement production, chemical industry, textile and other fields.
[0003] A screw blower includes a screw main body. The front side of the screw main body is connected to an end cover, and the rear side is connected to an exhaust seat. The main shaft of the screw main body extends out from the end cover connected to the front side for connecting to a motor assembly. In the existing screw blower, a skeleton oil seal is used between the main shaft and the end cover to prevent lubricating oil from entering the gas compression chamber of the screw main body.
[0004] However, the skeleton oil seal requires a very high concentricity between the main shaft and the end cover with which it cooperates, which is difficult to machine, and the sealing effect is not very ideal. Summary of the Invention
[0005] The purpose of this application is to provide a screw blower, which adopts a carbon ring seal structure and a spiral seal structure to improve the sealing effect of the output shaft end of the screw blower main body.
[0006] To achieve the above purpose, the technical solution adopted in this application is: a screw blower, including a main body. One side of the main body is connected to an end cover, the end cover is connected to a sealing cover. The sealing cover is arranged between the end cover and the main shaft of the main body, and the sealing cover is sleeved on the main shaft of the main body. A carbon ring seal structure and a spiral seal structure are sequentially arranged between the sealing cover and the main shaft along the output shaft direction of the main shaft.
[0007] Compared with the prior art, the advantages of this application are: a sealing cover, a carbon ring seal structure and a spiral seal structure are used to replace the traditional skeleton oil seal to seal the output shaft end of the screw blower main body, changing the sealing structure of the output shaft end of the main body in the traditional screw blower. The spiral seal structure is used as the first seal, and the carbon ring seal structure is used as the second seal. Two seal structures are set at the output shaft end of the main body, greatly improving the sealing effect. In addition, the carbon ring seal structure and the spiral seal structure are easy to machine and manufacture, and the required parts are also easy to obtain.
[0008] In some embodiments of this application, an oil return structure is arranged in the sealing cover, and the oil return structure communicates with the fuel tank of the main body. The oil return structure arranged in the sealing cover serves as the third seal, and the oil seeping into the sealing cover returns to the fuel tank of the main body through the oil return structure, further improving the sealing performance of the output shaft end of the screw blower.
[0009] In some embodiments of the present application, the carbon ring sealing structure includes a carbon ring, a pressing plate, and an elastic member. The pressing plate and the carbon ring are successively sleeved on the main shaft along the axial direction of the main shaft out of the shaft. The pressing plate and the carbon ring are both arranged in the sealing cover. The elastic member is arranged between the pressing plate and the carbon ring, and both ends of the elastic member are elastically abutted against the pressing plate and the carbon ring respectively.
[0010] In some embodiments of the present application, the spiral sealing structure includes a spiral groove provided on the main shaft, and an oil return gap is formed between the position of the spiral groove on the main shaft and the sealing cover.
[0011] In some embodiments of the present application, the oil return structure includes a first oil return hole, and the first oil return hole leads to the main engine oil tank.
[0012] In some embodiments of the present application, a ring groove structure for installing the carbon ring and the pressing plate is provided in the sealing cover.
[0013] In some embodiments of the present application, the oil return structure further includes a second oil return hole, and the second oil return hole leads to the first oil return hole.
[0014] In some embodiments of the present application, the oil return structure further includes a first oil return groove and a second oil return groove. The second oil return groove and the first oil return groove are successively arranged in the sealing cover along the axial direction of the main shaft out of the shaft. The first oil return groove leads to the second oil return groove. The second oil return hole is radially opened on the first oil return groove along the main shaft, and the first oil return hole is axially opened on the second oil return groove along the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of the present utility model;
[0016] Figure 2 is a schematic structural diagram of the sealing cover;
[0017] Figure 3 is a schematic structural diagram of a rotor structure with a main shaft;
[0018] Figure 4 is Figure 1 an enlarged schematic diagram at position A in
[0019] In the figure: 1, main engine; 2, end cover; 3, sealing cover; 4, main shaft; 5, carbon ring; 6, pressing plate; 7, elastic member; 8, spiral groove; 9, first oil return hole; 10, second oil return hole; 11, first oil return groove; 12, second oil return groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] Next, in combination with specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, any combination can be formed among the following-described embodiments or technical features to form a new embodiment.
[0021] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application 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, and should not be construed as limiting the specific protection scope of the present application.
[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.
[0023] The terms "comprising" and "having" in the description and claims of the present application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.
[0024] As Figures 1 - 4 shown, a screw blower includes a main body 1. A end cover 2 is connected to the left side of the main body 1. A sealing cover 3 is arranged on the end cover 2. The sealing cover 3 is sleeved in the shaft hole of the end cover 2, and the sealing cover 3 is fixed to the end cover 2 by a bolt assembly; the sealing cover 3 is located between the end cover 2 and the main shaft 4 of the main body 1, and the sealing cover 3 is externally sleeved on the main shaft 4. A carbon ring seal structure and a spiral seal structure are sequentially arranged between the sealing cover 3 and the main shaft 4 along the outlet shaft direction of the main shaft 4; an oil return structure is arranged in the sealing cover 3, and the oil return structure communicates with the fuel tank of the main body 1.
[0025] The carbon ring seal structure includes a carbon ring 5, a pressing plate 6, and an elastic member 7. The elastic member 7 can adopt a corrugated spring. The pressing plate 6 and the carbon ring 5 are sequentially externally sleeved on the main shaft 4 along the outlet shaft direction of the main shaft 4. Both the pressing plate 6 and the carbon ring 5 are arranged in the sealing cover 3. The elastic member 7 is arranged between the pressing plate 6 and the carbon ring 5, and both ends of the elastic member 7 are elastically abutted against the pressing plate 6 and the carbon ring 5 respectively; a ring groove structure for installing the carbon ring 5 and the pressing plate 6 is arranged in the sealing cover 3.
[0026] The spiral seal structure includes a spiral groove 8 provided on the main shaft 4, and an oil return gap is formed between the position of the spiral groove 8 on the main shaft 4 and the seal cover 3.
[0027] The oil return structure includes a first oil return hole 9, a second oil return hole 10, a first oil return groove 11 and a second oil return groove 12. The first oil return hole 9 leads to the oil tank of the main machine 1, the second oil return hole 10 leads to the first oil return hole 9, the second oil return groove 12 and the first oil return groove 11 are arranged in sequence along the shaft direction of the main shaft 4 in the seal cover 3, the first oil return groove 11 leads to the second oil return groove 12, the second oil return hole 10 is radially opened on the first oil return groove 11 along the main shaft 4, and the first oil return hole 9 is axially opened on the second oil return groove 12 along the main shaft 4.
[0028] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.
Claims
1. A screw blower, comprising a main unit (1), wherein one side of the main unit (1) is connected to an end cover (2), characterized in that: The end cover (2) is connected to a sealing cover (3), the sealing cover (3) being arranged between the end cover (2) and the main shaft (4) of the main machine (1), and the sealing cover (3) being sheathed on the main shaft (4) of the main machine (1), and a carbon ring sealing structure and a spiral sealing structure being arranged in sequence between the sealing cover (3) and the main shaft (4) along the shaft outlet direction of the main shaft (4); an oil return structure being arranged inside the sealing cover (3), the oil return structure being connected to the oil tank of the main machine (1); the oil return structure comprising a first oil return hole (9), the first oil return hole (9) leading to the oil tank of the main machine (1).
2. A screw blower according to claim 1, characterized in that: The carbon ring sealing structure comprises a carbon ring (5), a pressure plate (6) and an elastic member (7); the pressure plate (6) and the carbon ring (5) are sequentially sleeved on the main shaft (4) along the outgoing direction of the main shaft (4); the pressure plate (6) and the carbon ring (5) are both arranged in the sealing cover (3); the elastic member (7) is arranged between the pressure plate (6) and the carbon ring (5); and two ends of the elastic member (7) elastically abut against the pressure plate (6) and the carbon ring (5) respectively.
3. A screw blower according to claim 1, characterized in that: The spiral sealing structure comprises a spiral groove (8) provided on the main shaft (4), and an oil return gap is formed between the position of the spiral groove (8) on the main shaft (4) and the sealing cover (3).
4. A screw blower according to claim 2, characterized in that: The sealing cover (3) is provided with a ring groove structure for mounting the carbon ring (5) and the pressure plate (6).
5. The screw blower according to claim 1, characterized in that: The oil return structure further comprises a second oil return hole (10), wherein the second oil return hole (10) leads to the first oil return hole (9).
6. A screw blower according to claim 5, characterized in that: The oil return structure further comprises a first oil return groove (11) and a second oil return groove (12); the second oil return groove (12) and the first oil return groove (11) are sequentially arranged in the sealing cover (3) along the shaft outlet direction of the main shaft (4); the first oil return groove (11) leads to the second oil return groove (12); the first oil return groove (11) is provided with the second oil return hole (10) in the radial direction of the main shaft (4); and the second oil return groove (12) is provided with the first oil return hole (9) in the axial direction of the main shaft (4).