External mechanical sealing structure of lower frame body of coal mill
The mechanical seal structure for coal mills addresses sealing inefficiencies by integrating a dynamic ring and pressure ring system, ensuring reliable sealing and reduced maintenance, despite dynamic changes, thus enhancing operational safety and efficiency.
Patent Information
- Application Number
- CN202421826986.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing medium-speed coal mills have poor sealing effect on the off-shelf gas sealing structure, which is prone to wear and short life, and cannot adapt to the dynamic changes of coal mills, affecting the safety and stability of equipment and increasing maintenance costs.
A mechanical seal structure including a lower frame, a transmission shaft, a sealing seat, a moving ring, a pressure ring, a spring, a base and a variety of sealing rings is adopted. Through the coordination of the moving ring and a pressure ring, the sealing ring is tightly wrapped, adapting to the vibration and displacement of the coal mill, and improving sealing and stability.
It improves the sealing ability outside the coal mill off-shelf, reduces space occupied, facilitates installation and layout, enhances the adaptability and reliability of the sealing structure, avoids mutual interference, and improves the safety and economy of the equipment.
Smart Images
Figure CN223105253U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mill sealing, in particular to an external sealing structure of the lower frame of a mill. Background Art
[0002] The medium-speed mill is an important auxiliary equipment in a thermal power plant. The sealing performance of the external air seal of its lower frame has an important impact on the safety, stability and economy of the unit. However, the existing external air seal of the lower frame of the medium-speed mill uses a sealing ring for sealing. The sealing ring is composed of multiple arc-shaped sealing blocks spliced together, and there are gaps between adjacent sealing blocks, resulting in poor sealing effect, which may cause problems such as air leakage and powder leakage. In severe cases, it may even endanger the safe operation of the equipment and pollute the production environment. During the operation of the mill, good sealing is required between the lower frame and the external environment to ensure the normal operation of the equipment. The traditional sealing structure may have problems such as easy wear and short life of the sealing parts, which leads to frequent replacement of the sealing parts, increasing the maintenance cost and downtime.
[0003] Moreover, as the use time of the mill increases, the sealing structure may deform, loosen, etc., further affecting the sealing performance. At the same time, in different working environments and operating conditions, higher requirements are also put forward for the adaptability and reliability of the sealing structure.
[0004] To solve the above problems, it is necessary to improve the external sealing structure of the lower frame of the mill to improve its sealing performance, better adapt to the slight vibration and displacement of the lower frame during the operation of the mill and other dynamic changes, and maintain a stable and reliable sealing effect; make the sealing structure more compact, reduce the occupied space, and facilitate installation and layout in a limited space; better cooperate with other related components of the mill to avoid mutual interference or affect the overall performance. Summary of the Invention
[0005] The purpose of the utility model is to overcome the above deficiencies and provide a mechanical seal structure for the outside of the lower frame of a mill.
[0006] To achieve the above purpose, the present invention provides the following technical solutions:
[0007] An external mechanical seal structure for the lower frame of a coal mill, characterized in that it includes a lower frame body (1), a transmission shaft (2), a seal seat (3), a dynamic ring (4), a pressure ring (8), a spring (9), a base (10) and sealing rings (5, 6, 7); the seal seat (3) is in the core position, its center passes through the transmission shaft (2), and is firmly connected to the lower end of the lower frame body (1) by means of screws. Grooves are provided at the upper end, lower end and side of the dynamic ring (4) for installing the sealing rings (6, 7, 5). The center of the dynamic ring (4) also passes through the transmission shaft (2) and is installed inside the seal seat (3). The center of the base (10) passes through the transmission shaft (2), and 4 grooves are arranged at the upper end. Positioning pins are installed in these grooves. The positioning pins pass through the spring (9) and are tightly connected to the corresponding holes at the lower end of the pressure ring (8). The center of the pressure ring (8) also passes through the transmission shaft (2), and is tightly connected to the dynamic ring (4) through the groove at the upper end. The base (10) is installed at the lower end of the seal seat (3) by means of screws.
[0008] There are groove structures corresponding to the dynamic ring (4) and the sealing rings (6, 7, 5) inside the seal seat (3).
[0009] There is a groove corresponding to the sealing ring (7) at the upper end of the pressure ring (8).
[0010] The diameter of the hole corresponding to the positioning pin at the lower end of the pressure ring (8) is smaller than the diameter of the spring (9), so that the spring (9) gives a pressure to the pressure ring (8).
[0011] There are screw holes left at the lower end of the seal seat (3) for threaded connection with the base (10).
[0012] Pass the center of the seal seat (3) through the transmission shaft (2) and connect it to the lower end of the lower frame body (1) with screws. Then install the sealing rings (6, 7) in the corresponding grooves on the upper and lower end faces of the dynamic ring (4) respectively, and install the sealing ring (5) in the side groove of the dynamic ring (4). Pass the center of the dynamic ring (4) connected with the sealing rings (5, 6, 7) through the transmission shaft (2) and fit and connect it to the inner side of the seal seat (3). Then install 4 springs (9) respectively in an interference fit on the positioning pins installed in the 4 grooves at the upper end of the base (10). The positioning pins are connected to the holes corresponding to the positioning pins at the lower end of the pressure ring (8). Pass the combination of the pressure ring (8) and the base (10) through the transmission shaft (2) so that the upper end of the pressure ring (8) fits and connects with the lower end of the dynamic ring (4), and use screws to fixedly connect the base (10) and the lower end of the seal seat (3).
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] This structure enables the moving ring that moves with the transmission shaft to be wrapped inside the sealing seat and the base, isolating it from the outside world, improving its sealing performance, better adapting to the slight vibrations and displacements of the lower frame during the operation of the coal mill and other dynamic changes, and maintaining a stable and reliable sealing effect; making the sealing structure more compact, reducing the occupied space, and facilitating installation and layout in a limited space; better cooperating with other relevant components of the coal mill to avoid mutual interference or affecting the overall performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is an exploded view of the structure of the present utility model.
[0016] Figure 2 It is an exploded view of the lower view structure of the present utility model.
[0017] Figure 3 It is an assembly effect diagram of the present utility model.
[0018] Figure 4 It is a schematic diagram of a partial structure of the present utility model.
[0019] Reference numerals in the figures: 1, lower frame; 2, transmission shaft; 3, sealing seat; 4, moving ring; 5, 6, 7, sealing rings of different models; 8, pressure ring; 9, spring; 10, base. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] Next, the technical solutions in the embodiments of the present invention will be completely described in conjunction with the accompanying drawings in the embodiments of the present invention.
[0021] As shown in the figure, a mechanical seal structure outside the lower frame of a coal mill is characterized by including a lower frame (1), a transmission shaft (2), a sealing seat (3), a moving ring (4), a pressure ring (8), a spring (9), a base (10), and sealing rings (5, 6, 7); the sealing seat (3) is in the core position, its center passes through the transmission shaft (2), and is firmly connected to the lower end of the lower frame (1) by means of screws, grooves are provided at the upper, lower, and side surfaces of the moving ring (4) for installing the sealing rings (6, 7, 5), the center of the moving ring (4) also passes through the transmission shaft (2), and is installed inside the sealing seat (3), the center of the base (10) passes through the transmission shaft (2), and 4 grooves are arranged at the upper end, positioning pins are installed in these grooves, the positioning pins pass through the spring (9) and are tightly connected to the corresponding holes at the lower end of the pressure ring (8), the center of the pressure ring (8) also passes through the transmission shaft (2), and is tightly connected to the moving ring (4) through the groove at the upper end, and the base (10) is installed at the lower end of the sealing seat (3) by means of screws.
[0022] The sealing seat (3) has a groove structure corresponding to the moving ring (4) and the sealing rings (6, 7, 5) inside.
[0023] The upper end of the pressure ring (8) has a groove corresponding to the sealing ring (7).
[0024] The diameter of the hole corresponding to the positioning pin at the lower end of the pressure ring (8) is smaller than the diameter of the spring (9), so that the spring (9) gives a pressure to the pressure ring (8).
[0025] The lower end of the sealing seat (3) is provided with a threaded hole for threaded connection with the base (10).
[0026] Pass the center of the sealing seat (3) through the transmission shaft (2) and connect it to the lower end of the lower frame body (1) with screws. Then, install the sealing rings (6, 7) in the grooves corresponding to the upper and lower end faces of the moving ring (4) respectively, and install the sealing ring (5) in the groove on the side of the moving ring (4). Pass the center of the moving ring (4) connected with the sealing rings (5, 6, 7) through the transmission shaft (2) and fit and connect it to the inner side of the sealing seat (3). Then, press-fit and install 4 springs (9) on the positioning pins installed in 4 grooves at the upper end of the base (10) respectively. The positioning pins are connected to the holes corresponding to the positioning pins at the lower end of the pressure ring (8). Pass the combination of the pressure ring (8) and the base (10) through the transmission shaft (2) so that the upper end of the pressure ring (8) is in contact and connected with the lower end of the moving ring (4), and use screws to fixedly connect the base (10) and the lower end of the sealing seat (3).
Claims
1. An external mechanical seal structure for the lower frame of a coal mill, characterized in that It includes a lower frame body (1), a transmission shaft (2), a sealing seat (3), a moving ring (4), a pressure ring (8), a spring (9), a base (10) and sealing rings (5, 6, 7); the sealing seat (3) is in the core position, its center passes through the transmission shaft (2), and is firmly connected to the lower end of the lower frame body (1) by screws. Grooves are provided at the upper end, lower end and side of the moving ring (4) for installing the sealing rings (6, 7, 5). The center of the moving ring (4) also passes through the transmission shaft (2) and is installed inside the sealing seat (3). The center of the base (10) passes through the transmission shaft (2), and 4 grooves are arranged at the upper end. Positioning pins are installed in these grooves. The positioning pins pass through the spring (9) and are tightly connected to the corresponding holes at the lower end of the pressure ring (8). The center of the pressure ring (8) also passes through the transmission shaft (2) and is tightly connected to the moving ring (4) through the groove at the upper end. The base (10) is installed at the lower end of the sealing seat (3) by screws.
2. The mechanical seal structure outside the lower frame of the coal mill according to claim 1, wherein There is a groove structure corresponding to the moving ring (4) and the sealing rings (6, 7, 5) inside the sealing seat (3).
3. The mechanical seal structure outside the lower frame of the coal mill according to claim 1, wherein There is a groove corresponding to the sealing ring (7) at the upper end of the pressure ring (8).
4. The mechanical seal structure outside the lower frame of the coal mill according to claim 1, characterized in that The diameter of the hole corresponding to the positioning pin at the lower end of the pressure ring (8) is smaller than the diameter of the spring (9), so that the spring (9) gives a pressure to the pressure ring (8).
5. The mechanical seal structure outside the lower frame of the coal mill according to claim 1, wherein There are screw holes left at the lower end of the sealing seat (3) for threaded connection with the base (10).