High temperature centrifugal fan seal

Abstract

The utility model discloses high temperature centrifugal fan sealing device relates to sealing device technical field, the main shaft, the sealing bearing of assembly on the main shaft and the two piece outer positioning plate of assembly on the main shaft, the sealing bearing includes the inner ring and the two piece bearing seal ring of sleeve joint in the both sides of inner ring, each piece the sealing bearing ring surface faces the one side of steel ball and all has the multi -group oil -circulating part of arrangement in the circumference, the oil -circulating part includes the oil -circulating tank and sets up in the multiple oil baffle of oil -circulating tank, the oil -circulating tank between oil baffle and forms the oil -accumulating cavity of oil accumulation, through setting up the oil -circulating part containing spiral oil baffle on bearing seal ring, utilize oil baffle to extend the moving path of lubricating oil under the centrifugal force effect, cooperate the efficient accumulation of lubricating oil with the oil -accumulating cavity, will lubricating oil directional drainage back to the way of complement lubrication with the circulation path formed by guide oil hole and upper triangular plate simultaneously, ensure the instant lubrication effect of sealing bearing next time start.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and in particular to a sealing device for a high-temperature centrifugal fan. Background Technology

[0002] In high-temperature centrifugal fans, sealed bearings are the core components that ensure stable operation of the equipment. Their main function is to simultaneously achieve the dual functions of "supporting the rotation of the main shaft" and "sealing and protecting": on the one hand, through the cooperation of inner and outer rings and rolling elements, the rotational friction of the main shaft is converted into low-resistance rolling friction, ensuring that the main shaft can still operate efficiently under high-temperature conditions; on the other hand, through structures such as bearing seals, the flow of high-temperature media inside the casing to the external environment is blocked, preventing the leakage of high-temperature gas and dust, while also preventing external cooling water and impurities from entering the bearing, which is crucial to the safety and operating efficiency of the equipment.

[0003] However, when existing sealed bearings are used in high-temperature centrifugal fans, there is a common problem with lubricant management. Under the combined effect of centrifugal force generated by the high-speed rotation of the spindle and the high-temperature environment, the lubricant is prone to rapid diffusion and loss to the outside. Moreover, the high temperature will accelerate the oxidation and deterioration of the lubricant, resulting in insufficient lubrication of the bearing raceway and rolling elements. This not only aggravates wear and shortens the bearing life, but may also cause the sealing gap to increase due to lubrication failure, further aggravating the risk of media leakage and equipment failure.

[0004] Therefore, this utility model proposes a sealing device for a high-temperature centrifugal fan to solve the above problems. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a sealing device for a high-temperature centrifugal fan, comprising:

[0007] spindle;

[0008] A sealed bearing is mounted on the main shaft. The sealed bearing includes an inner ring and two bearing seal rings sleeved on both sides of the inner ring. Each of the sealed bearing rings has multiple sets of oil circulation components arranged circumferentially on the side facing the steel ball. The oil circulation components include an oil circulation tank and multiple oil baffles disposed in the oil circulation tank. An oil storage chamber for storing oil is formed between the oil baffles and the oil circulation tank.

[0009] Two external positioning plates are mounted on the main shaft. The two external positioning plates are respectively located on both sides of the sealed bearing and abut against both sides of the sealed bearing to position the sealed bearing ring.

[0010] As a preferred embodiment of the high-temperature centrifugal fan sealing device of the present invention, the oil circulation tank has a tight oil guide hole on the side near the inner ring, the oil baffle extends spirally along the rotation direction of the main shaft, and the arc surface of the oil baffle is adapted to the inner wall of the oil circulation tank.

[0011] As a preferred embodiment of the high-temperature centrifugal fan sealing device of the present invention, two inner positioning plates are assembled on both sides of the inner ring, a connecting plate is attached to the opposite sides of the two inner positioning plates, and an upper triangular plate is connected between the inner positioning plates and the connecting plate.

[0012] As a preferred embodiment of the high-temperature centrifugal fan sealing device of the present invention, the connecting plate is configured as an L-shaped bent plate, one end of the connecting plate passes through the gap between the bearing seal ring and the inner ring and abuts against the outer positioning plate, and the connecting plate and the outer positioning plate form a positioning ring cavity through which the bearing seal ring passes.

[0013] As a preferred embodiment of the high-temperature centrifugal fan sealing device of the present invention, a positioning frame is arranged between the connecting plate and the bearing sealing ring. The positioning frame includes a positioning ring and a plurality of equally spaced positioning blocks assembled on the positioning ring. The positioning blocks are assembled as elastic telescopic blocks.

[0014] As a preferred embodiment of the high-temperature centrifugal fan sealing device of the present invention, the bearing sealing ring has a positioning ring ring for positioning frame on its surface, the elastic telescopic block and the positioning ring are engaged in the positioning ring ring, and the connecting plate has a positioning hole for the positioning block to pass through.

[0015] The beneficial effects of this utility model are as follows: By setting an oil circulation component with a spiral oil baffle on the bearing seal ring, the oil baffle extends the movement path of the lubricating oil under centrifugal force. Combined with the oil storage chamber, it achieves efficient storage of lubricating oil. At the same time, by using the circulation path formed by the oil guide hole and the upper triangular plate, the lubricating oil is directed back to the raceway to replenish lubrication. This not only avoids the rapid diffusion and loss of lubricating oil under high temperature and high speed, but also allows the stored lubricating oil to flow back quickly when the spindle stops, ensuring the immediate lubrication effect when the sealed bearing starts up again. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the sealed bearing in this utility model;

[0018] Figure 2 This utility model Figure 1 Enlarged view of the A-section structure;

[0019] Figure 3 This is an isometric view of the overall structure of the sealed bearing in this utility model;

[0020] Figure 4 This utility model Figure 3 Enlarged view of the structure of part B.

[0021] Explanation of reference numerals in the attached drawings: 101, spindle; 201, outer positioning plate; 301, inner ring; 302, outer ring; 303, bearing seal ring; 3031, oil circulation tank; 3032, positioning ring; 3033, oil baffle; 304, steel ball; 305, cage; 306, positioning ring; 3061, positioning block; 307, connecting plate; 3071, positioning hole; 308, inner positioning plate; 3081, upper triangular plate. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] Reference Figures 1-4 As shown, this utility model provides a sealing device for a high-temperature centrifugal fan, with a main shaft 101;

[0026] A sealed bearing is mounted on the main shaft 101. The sealed bearing includes an inner ring 301, an outer ring 302, and steel balls 304 that roll between the inner ring 301 and the outer ring 302. The surfaces of the inner ring 301 and the outer ring 302 are provided with raceways for the steel balls 304 to roll.

[0027] A retainer 305 for separating and guiding the steel ball 304 is provided between the inner ring 301 and the outer ring 302. Two bearing seal rings 303 are sleeved on both sides of the inner ring 301. Each bearing seal ring has multiple sets of oil circulation components arranged circumferentially on the side facing the steel ball 304.

[0028] Two outer positioning plates 201 are mounted on the main shaft 101. The two outer positioning plates 201 are respectively located on both sides of the sealed bearing and abut against both sides of the sealed bearing to position the sealed bearing ring.

[0029] Among them, reference Figure 3 and Figure 4 As shown, the oil circulation component includes an oil circulation tank 3031 mounted on the surface of the sealed bearing ring and multiple oil baffles 3033 disposed within the oil circulation tank 3031. An oil storage chamber is formed between the oil baffles 3033 and the oil circulation tank 3031. As the inner ring 301 and the sealed bearing ring rotate at high speed with the main shaft 101, the lubricating oil accumulated in the inner ring 301 moves away from the center of rotation under the action of centrifugal force. The multiple layers of oil baffles 3033 block and extend the path of the lubricating oil movement, and retain some lubricating oil to enter the oil storage chamber. When the main shaft 101 stops, the lubricating oil has a shorter path to return to its original position. At the same time, more oil circulation tanks 3031 and oil baffles 3033 have a larger oil storage surface area.

[0030] Furthermore, the oil circulation tank 3031 has a tightly closed oil guide hole on the side near the inner ring 301. The oil guide hole forms a hole for lubricating oil to pass through. The oil baffle 3033 extends spirally along the rotation direction of the main shaft 101. The arc surface of the oil baffle 3033 is adapted to the inner wall of the oil circulation tank 3031. When the main shaft 101 rotates, it can guide the lubricating oil that diffuses to the outside along the spiral trajectory to the oil storage chamber. At the same time, the gradual change of the spiral helix angle enhances the stepwise obstruction of the lubricating oil, further improving the oil storage efficiency of the oil storage chamber.

[0031] Reference Figure 1 and Figure 2 As shown, two inner positioning plates 308 are mounted on both sides of the inner ring 301. A connecting plate 307 is attached to the opposite sides of the two inner positioning plates 308. An upper triangular plate 3081 is connected between the inner positioning plates 308 and the connecting plate 307. The two right-angled sides of the upper triangular plate 3081 are connected to the top surface of the inner positioning plate 308 and the side surface of the connecting plate 307, respectively. The lubricating oil on the surface of the inner ring 301 can be transferred to the surface of the connecting plate 307 through the inner positioning plates 308 and the upper triangular plate 3081, and then guided to the surface of the bearing seal ring 303 to supplement the raceway lubrication.

[0032] Furthermore, the connecting plate 307 is set in an L-shaped bent plate. One end of the connecting plate 307 passes through the gap between the bearing seal ring 303 and the inner ring 301 and abuts against the outer positioning plate 201. The connecting plate 307 and the outer positioning plate 201 form a positioning ring 306 cavity through which the bearing seal ring 303 passes.

[0033] Specifically, the vertical section of the connecting plate 307 is tightly fitted with the end face of the inner positioning plate 308 and the bearing seal ring, respectively. The horizontal section of the connecting plate 307 extends outward along the axial direction of the main shaft 101 and abuts against the outer positioning plate 201. The inner wall of the positioning ring 306 cavity enclosed by the connecting plate 307 and the outer positioning plate 201 is clearance-fitted with the outer circumferential surface of the bearing seal ring 303. The radial wobble of the bearing seal ring 303 is restricted by the circumferential constraint of the positioning ring 306 cavity. At the same time, a small axial compensation is generated by the positioning ring 306 cavity to compensate for the displacement of the bearing seal ring 303 caused by the synchronous rotation of the inner ring 301. This ensures that the sealing surfaces between the bearing seal ring 303 and the inner ring 301 and the outer positioning plate 201 are always tightly fitted, reducing the leakage of lubricating oil from the gap.

[0034] Reference Figure 3 and Figure 4 As shown, a positioning frame is arranged between the connecting plate 307 and the bearing seal ring 303. The positioning frame includes a positioning ring 306 and a plurality of equally spaced positioning blocks 3061 assembled on the positioning ring 306. The positioning blocks 3061 are assembled as elastic telescopic blocks.

[0035] The bearing seal ring 303 has a positioning ring 3032 for positioning frame on its surface. The elastic telescopic block and the positioning ring 306 are engaged in the positioning ring 3032. The connecting plate 307 has a positioning hole 3071 for the positioning block 3061 to pass through.

[0036] Furthermore, the elastic telescopic block is configured as an elastic structure that expands and contracts radially along the positioning ring 306. A compression spring is embedded inside it. In the free state, the outer end extends out of the outer circumference of the positioning ring 306. When compressed, it can contract to be flush with the outer circumference of the positioning ring 306. The surface of the bearing seal ring 303 is provided with a positioning ring ring 3032 for positioning the positioning frame. The elastic telescopic block and the positioning ring 306 are engaged in the positioning ring ring 3032. The connecting plate 307 is provided with a positioning hole 3071 for the positioning block 3061 to pass through. By engaging the elastic telescopic block with the positioning hole 3071 circumferentially, the circumferential rotation of the bearing seal ring 303 in the cavity of the positioning ring 306 is restricted, so as to avoid oil leakage caused by the increase of the gap between the sealing surfaces due to relative rotation.

[0037] Among them, since the elastic telescopic block can extend and retract radially along the main shaft 101, the bearing seal ring 303 is circumferentially positioned by the engagement of the elastic telescopic block with the positioning hole 3071, and the compression spring buffers the slight radial displacement that may occur when the main shaft 101 rotates at high speed.

[0038] Working principle: When the main shaft 101 rotates, the inner ring 301, bearing seal ring 303, outer positioning plate 201, and positioning frame fixed on the main shaft 101 rotate synchronously, while the outer ring 302 remains relatively fixed to the housing of the centrifugal fan. Guided by the cage 305, the steel balls 304 roll between the raceway of the rotating inner ring 301 and the raceway of the stationary outer ring 302, achieving low-friction support.

[0039] Under the action of centrifugal force, the lubricating oil diffuses outward. The spiral oil baffle 3033 of the oil circulation component guides it along the trajectory to the oil storage chamber for storage. The oil guide hole and the upper triangular plate 3081 form a circulation path to guide the lubricating oil back to the raceway to replenish lubrication. When the main shaft 101 stops, the lubricating oil in the oil storage chamber can quickly flow back to ensure lubrication for the next start-up.

[0040] The connecting plate 307 and the outer positioning plate 201 remain relatively stationary due to synchronous rotation. The positioning ring 306 cavity enclosed by the two forms a radial constraint on the bearing seal ring 303, while allowing a small amount of axial compensation to ensure the sealing surface fits. The elastic telescopic block of the positioning frame engages with the positioning hole 3071 of the connecting plate 307, restricting the circumferential rotation of the bearing seal ring 303. The elastic structure can also buffer the small radial offset when the spindle 101 rotates, ultimately achieving stable sealing and efficient lubrication circulation under high-temperature conditions.

[0041] This application incorporates an oil circulation component with a spiral oil baffle 3033 on the bearing seal ring 303. The oil baffle 3033 extends the movement path of the lubricating oil under centrifugal force, achieving efficient lubricating oil retention in conjunction with the oil storage chamber. Simultaneously, the circulation path formed by the oil guide hole and the upper triangular plate 3081 directs the lubricating oil back to the raceway for supplemental lubrication. This avoids rapid diffusion and loss of lubricating oil under high temperature and high speed, and allows the stored lubricating oil to quickly flow back when the main shaft 101 stops, ensuring immediate lubrication upon the next start-up of the sealed bearing. Secondly, the positioning ring 306 cavity formed by the connecting plate 307 and the outer positioning plate 201 rotating synchronously with the main shaft 101, through... Radial constraint and slight axial compensation ensure that the bearing seal ring 303 and the sealing surface of related components are always in close contact. The elastic telescopic block of the positioning frame effectively restricts the circumferential rotation of the bearing seal ring 303 by engaging with the positioning hole 3071 of the connecting plate 307, avoiding the increase of sealing gap caused by relative friction. At the same time, the elastic structure can buffer the slight radial displacement when the main shaft 101 rotates, preventing the seal failure caused by rigid interference, significantly reducing the loss and leakage of lubricating oil, reducing bearing wear caused by insufficient lubrication, extending the service life of the sealing device, and maintaining stable sealing performance under high temperature conditions, ensuring the safe and efficient operation of the high temperature centrifugal fan.

[0042] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0043] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0044] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing device for a high-temperature centrifugal fan, characterized in that, include: Spindle (101); A sealed bearing is mounted on the main shaft (101). The sealed bearing includes an inner ring (301) and two bearing seal rings (303) sleeved on both sides of the inner ring (301). Each of the sealed bearing rings has multiple sets of oil circulation components arranged circumferentially on the side facing the steel ball. The oil circulation components include an oil circulation tank (3031) and multiple oil baffles (3033) disposed in the oil circulation tank (3031). An oil storage chamber for storing oil is formed between the oil baffles (3033) and the oil circulation tank (3031). Two outer positioning plates (201) are mounted on the main shaft (101). The two outer positioning plates (201) are respectively located on both sides of the sealed bearing and abut against both sides of the sealed bearing to position the sealed bearing ring.

2. The high-temperature centrifugal fan sealing device as described in claim 1, characterized in that: The oil circulation tank (3031) has a tight oil guide hole on the side near the inner ring (301), and the oil baffle (3033) extends spirally along the rotation direction of the main shaft (101). The arc surface of the oil baffle (3033) is adapted to the inner wall of the oil circulation tank (3031).

3. The high-temperature centrifugal fan sealing device as described in claim 2, characterized in that: Two inner positioning plates (308) are assembled on both sides of the inner ring (301). A connecting plate (307) is attached to the opposite side of the two inner positioning plates (308). An upper triangular plate (3081) is connected between the inner positioning plates (308) and the connecting plate (307).

4. The high-temperature centrifugal fan sealing device as described in claim 3, characterized in that: The connecting plate (307) is arranged in an L-shaped bend. One end of the connecting plate (307) passes through the gap between the bearing seal ring (303) and the inner ring (301) and abuts against the outer positioning plate (201). The connecting plate (307) and the outer positioning plate (201) form a positioning ring (306) cavity through which the bearing seal ring (303) passes.

5. The high-temperature centrifugal fan sealing device as described in claim 4, characterized in that: A positioning frame is arranged between the connecting plate (307) and the bearing seal ring (303). The positioning frame includes a positioning ring (306) and a plurality of equally spaced positioning blocks (3061) assembled on the positioning ring (306). The positioning blocks (3061) are assembled as elastic telescopic blocks.

6. The high-temperature centrifugal fan sealing device as described in claim 5, characterized in that: The bearing seal ring (303) has a positioning ring (3032) for positioning frame on its surface. The elastic telescopic block and the positioning ring (306) are engaged in the positioning ring (3032). The connecting plate (307) has a positioning hole (3071) for the positioning block (3061) to pass through.

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