CN204458482U - New blower bearing support labyrinth gland - Google Patents

Abstract

A new type of labyrinth sealing device for blower bearing seat, including shaft seal (1), characterized in that the shaft seal (1) is installed on the bearing seat (3), and fixed with sealant, and the shaft seal (1) is designed with a felt groove (5) and the oil return tank (6), the bottom of the oil return tank (6) is designed with an oil return hole (7), wherein the felt tank (5) is filled with felt, and the felt is in contact with the rotating shaft (4). The labyrinth sealing device has the characteristics of good sealing effect, reliable performance, compact structure, and simple installation process.

Description

A new labyrinth sealing device for blower bearing seat

Technical field:

The novel seal relates to the field of air blowers, in particular to a sealing device used between a rotating shaft of a centrifugal fan and a bearing seat.

Background technique:

At present, the shaft end seals used on the bearing seats of large centrifugal blowers, induced draft fans and some blowers have the following situations: one is to simply use felt for sealing, this kind of seal is a contact seal, and the felt is installed on the bearing seat In the groove of the sealing device, the felt is used to contact the rotating shaft to block the leakage of lubricating oil and the entry of external dust. The felt has been rubbed against the rotating shaft for a long time, and the sealing function will fail due to the loss of elasticity after heating and carbonization; the second is to use a flexible lip-shaped fluorine The rubber sealing ring is used for sealing, which is a contact seal. This kind of sealing has high requirements on the precision of the fan shaft and the material of the sealing ring. Grooves are likely to be formed on the working surface of the rotating shaft after long-term operation, and the oil lip of the sealing ring loses elasticity or is easily damaged. A lubricant leak has occurred.

Contents of the invention

The purpose of this new type of labyrinth sealing device for blower bearing seat is to solve the above-mentioned leakage problem of lubricating oil. This kind of sealing has the characteristics of good sealing effect, reliable performance, compact structure, and simple installation process. The technical scheme adopted in the utility model is:

The new type of labyrinth sealing device for the bearing seat of the blower is equipped with a shaft seal on the bearing seat, and is fixed by applying sealant. The shaft seal is designed with a felt groove and an oil return groove (6), and an oil return hole is designed at the bottom of the oil return groove. The center is filled with felt, which is in contact with the shaft.

Preferably, the shaft seal is designed with an oil deflector ring, which is fixed to the rotating shaft and rotates synchronously, and the maximum outer diameter of the oil deflector ring does not contact the oil surface of the lubricating oil.

Preferably, the oil slinger is designed at 5mm from the front end of the shaft seal.

Preferably, the oil slinger is designed with flanging, and the flanging extends toward the sealing side.

Preferably, two oil return tanks are designed.

Preferably, the shaft seal is not in contact with the rotating shaft.

Preferably, both the shaft seal and the oil slinger are of split design.

The novel blower bearing seat labyrinth sealing device has the characteristics of good sealing effect, reliable performance, compact structure, simple installation process and the like.

Description of drawings

Fig. 1 is the structural representation of the present invention, wherein:

1-shaft seal; 2-oil retaining ring; 3-bearing seat; 4-rotating shaft; 5-felt groove; 6-oil return groove; 7-oil return hole; 8-bearing; 9-lubricating oil.

Detailed ways

The implementation of the utility model is described below in conjunction with the accompanying drawings: a certain gap is maintained with the bearing seat 3 during the rotation of the rotating shaft 4, which can not only reduce friction and heat, but also protect the rotating shaft 4 from being damaged by wear and tear. But the gap will cause the lubricating oil 9 to leak, so a shaft seal 1 is designed between the rotating shaft and the bearing seat. For ease of installation, the shaft seal 1 is split up and down like the bearing housing 3, and the shaft seal 1 and the bearing housing 3 are fixed with sealant when installed.

The new type of seal is suitable for the sealing device of the fan bearing seat, including the non-contact split shaft seal 1 with the rotating shaft 4 and the split bearing seat 3, the shaft seal 1 is embedded in the groove of the hole of the bearing seat 3, and the shaft seal 1 There is a gap of 0.20mm between the shaft seal 1 and the shaft seal 1, and a groove 5 for installing felt is processed on the shaft seal 1. After the felt is installed, the last sealing line of defense between the shaft seal 1 and the shaft 4 is realized. Only the felt in the felt groove 5 is in contact with the rotating shaft 4 . The oil deflector ring 2 is designed at the front end 5mm of the shaft seal 1, and the oil deflector ring 2 is fixed with the rotating shaft 4 and rotates synchronously. The split oil deflector ring 2 is flanged, and the flanging extends to the sealing side (the gap between the oil deflector ring and the seal is reserved for 5 mm), and the oil droplets splashed when the bearing rotates are thrown into the oil chamber or the bearing along the circumferential direction. The seat inner wall flows into the oil pool behind, and the flanging of the oil deflector ring blocks most of the lubricating oil from approaching the shaft seal 1. The shaft seal 1 is processed with two oil return grooves 6, and the two oil return grooves 6 in the lower half of the shaft seal 1 are each processed with a 6mm oil return hole 7, and the outer diameter of the shaft seal 1 extending into the oil chamber The size is reduced (retain two oil grooves), keep away from the liquid level of the oil chamber, and ensure that the oil accumulated in the labyrinth groove flows to the oil chamber by itself.

The upper and lower split bearing housing 3, the internal main working components are the rolling bearing 8 and the rotating shaft 4, the bearing housing 3 has a fixed amount of lubricating oil 9, and its oil level is high enough to ensure that the balls at the bottom of the bearing are soaked to achieve the purpose of lubricating the bearing. The rotating shaft 4 and the bearing 8 rotate rapidly, and the balls of the bearing 8 drive the lubricating oil 9 to splash around. A large amount of lubricating oil 9 splashes to the shaft seal 1 and is first blocked by the oil retaining ring 2. A small amount of lubricating oil 9 and oil gas pass through the rotating shaft 4 and the shaft seal 1 The gap enters the oil return groove 6, and returns to the lubricating oil 9 pool of the bearing seat 3 through the oil return hole 7, and a very small amount of lubricating oil 9 is finally blocked by the felt, thereby minimizing the leakage of the lubricating oil.

The new labyrinth seal device for blower bearing seat has compact structure, saves space, simple manufacturing and installation process, and effectively solves the problem that the original labyrinth seal has too large outer diameter extending into the oil chamber, and the oil return hole is immersed below the lubricating oil level of the bearing seat. , the oil accumulated in the labyrinth groove cannot be removed; the outer diameter of the original oil retaining ring is too large to contact the liquid surface, the oil retaining effect is weakened, and there are disadvantages of disturbing the fluctuation of the liquid level; the new seal keeps the seal and the oil retaining ring away from the fluid in the bearing chamber On the surface, the oil accumulated in the labyrinth groove can be discharged in a timely and smooth manner, so as to prevent the leakage of lubricating oil in the bearing seat; and the oil retaining ring is transformed into a flanging form, which better prevents excessive contact of splashing oil droplets and seals. Its exquisite design and unique The transformation enables this set of labyrinth sealing device to exert a good sealing effect on the blower bearing seat, improves the safety and reliability of the equipment, and produces a better energy-saving effect.

Claims (7)

1. A new type of labyrinth sealing device for blower bearing housings, including a shaft seal (1), characterized in that the shaft seal (1) is installed on the bearing housing (3) and fixed with sealant, and the shaft seal (1) is designed with a The felt groove (5) and the oil return groove (6), the bottom of the oil return groove (6) is designed with an oil return hole (7), wherein the felt groove (5) is filled with felt, and the felt is in contact with the rotating shaft (4). 2. The new labyrinth sealing device for blower bearing seat according to claim 1, characterized in that the shaft seal (1) is designed with an oil deflector ring (2), and the oil deflector ring (2) is fixed and rotates synchronously with the rotating shaft (4) , the maximum outer diameter of the oil deflector ring (2) does not contact with the oil surface of the lubricating oil (9). 3. The novel labyrinth sealing device for blower bearing seat according to claim 2, characterized in that the oil slinger (2) is designed at 5 mm from the front end of the shaft seal (1). 4. The novel labyrinth sealing device for blower bearing seat according to claim 2, characterized in that the oil deflector ring (2) is designed with flanging, and the flanging extends to the sealing side. 5. The novel labyrinth sealing device for blower bearing seat according to claim 1, characterized in that, two oil return grooves (6) are designed in total. 6. The novel labyrinth sealing device for blower bearing seat according to claim 1, characterized in that the shaft seal (1) is not in contact with the rotating shaft (4). 7. The novel labyrinth sealing device for blower bearing seat according to any one of claims 1-6, characterized in that, the shaft seal (1) and the oil deflector (2) are both split designs.