A sealing structure for preventing water vapor from invading a bearing box of a centrifugal fan

Abstract

The utility model relates to the fan field, concretely relates to a kind of sealing structure for preventing water vapor invasion centrifugal fan bearing box, including fan shaft, the fan shaft passes through bearing side cover and fan casing in turn, and the fan shaft between the bearing side cover and the fan casing is fixedly installed with baffle ring on it, the baffle ring protrudes from the outer wall of the fan shaft, installation hole is equipped on the baffle ring, and the inner wall of the installation hole is attached with the outer wall of the fan shaft;By setting baffle ring, most water vapor enters bearing box, then further improves sealing property by installing skeleton oil seal on bearing gland.

Description

Technical Field

[0001] This utility model relates to the field of fans, specifically to a sealing structure for preventing water vapor from entering the bearing housing of a centrifugal fan. Background Technology

[0002] The booster fan in the phosphate fertilizer production plant's tail gas treatment unit is a crucial piece of equipment for tail gas treatment. The bearing side cover seal of the fan bearing housing is a honeycomb labyrinth seal, widely used in centrifugal fan bearing housings due to its ultra-low leakage, wear-free operation, maintenance-free nature, and adaptability to high speeds and temperatures. However, in actual production, positive pressure can easily occur at the booster fan casing shaft seal, leading to liquid accumulation. Ultimately, a large amount of liquid is carried by the positive pressure gas, breaking through the honeycomb labyrinth shaft seal and entering the bearing housing. This causes oil emulsification within the bearing housing, resulting in bearing damage. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure to prevent water vapor from entering the bearing housing of a centrifugal fan, which can effectively prevent water vapor from entering the bearing housing and causing oil emulsification, thereby solving the defects mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A sealing structure for preventing moisture intrusion into a centrifugal fan bearing housing includes a fan shaft that passes sequentially through a bearing side cover and a fan housing. A retaining ring is fixedly installed on the fan shaft located between the bearing side cover and the fan housing. The retaining ring protrudes from the outer wall of the fan shaft and has a mounting hole. The inner wall of the mounting hole fits against the outer wall of the fan shaft.

[0005] As a further improvement, a bearing cover is also fixedly installed on the bearing side cover, through which the fan shaft passes, and a skeleton oil seal that matches the outer wall of the fan shaft is fixedly installed on the bearing cover.

[0006] As a further improvement, a protective cover is fixedly installed on the retaining ring. The protective cover is circular with its opening facing the bearing side cover and is coaxially arranged with the fan shaft. An annular baffle, coaxially arranged with the fan shaft, is fixedly installed on the side of the bearing cover near the fan housing. The annular baffle extends into the opening of the protective cover.

[0007] As a further improvement, a sealing ring that matches the opening of the protective cover is fixedly installed on the outer wall of the annular baffle.

[0008] As a further improvement, a placement box is installed inside the annular baffle, the placement box is filled with desiccant, and the side wall of the placement box is provided with ventilation holes.

[0009] Compared with the prior art, the beneficial effects of this utility model are: This application isolates most of the water vapor from entering the bearing housing by setting a retaining ring, and further improves the sealing performance by installing a skeleton oil seal on the bearing cover. This effectively prevents water vapor from entering the bearing housing, avoids oil emulsification, and extends the service life of the lubricating oil and the fan. This application effectively reduces the amount of moisture entering the protective cover by setting a sealing ring, and further reduces the intrusion of moisture into the bearing housing by using a desiccant placed in the box to absorb the small amount of moisture that enters the protective cover. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0011] Figure 1 This is a schematic diagram of the existing fan shaft without the retaining ring installed; Figure 2 This is a structural schematic diagram of Embodiment 1 of the present utility model; Figure 3 yes Figure 2 A magnified view of part I; Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the bearing cap structure of Embodiment 2 of this utility model.

[0012] In the diagram: 1-fan shaft; 2-bearing housing; 3-fan casing; 4-bearing side cover; 5-retaining ring; 6-bearing gland; 7-skeletal oil seal; 8-protective cover; 9-annular baffle; 10-sealing ring; 11-placement box; 12-ventilation hole. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example 1: like Figure 2 and Figure 3As shown, a sealing structure for preventing water vapor from entering the bearing housing of a centrifugal fan includes a fan shaft 1. The fan shaft 1 is rotatably mounted on the bearing housing 2 via a bearing. The fan shaft 1 extends to the left outside the bearing housing 2 and passes through the fan casing 3. A bearing side cover 4 is also fixedly installed on the left side of the bearing housing 2 by bolts, and the fan shaft 1 passes through the bearing side cover 4.

[0015] A retaining ring 5 is bolted to the fan shaft 1 located between the bearing side cover 4 and the fan housing 3. The retaining ring 5 is coaxial with the fan shaft 1 and protrudes from the outer wall of the fan shaft 1. The plane of the side of the retaining ring 5 closest to the fan housing 3 is perpendicular to the fan shaft 1. A mounting hole is provided at the center of the retaining ring 5. The mounting hole is fitted onto the outer wall of the fan shaft 1 and the inner wall of the mounting hole is in contact with the outer wall of the fan shaft 1.

[0016] A bearing cover 6 is also fixedly installed on the left side of the bearing side cover 4 by bolts. The fan shaft 1 passes through the bearing cover 6. An oil seal groove is provided at the center of the left side of the bearing cover 6. A skeleton oil seal 7 that matches the outer wall of the fan shaft 1 is embedded in the oil seal groove.

[0017] like Figure 1 As shown in the figure, the arrow indicates the direction of gas flow. When the retaining ring 5 and the skeleton oil seal 7 are not installed, the positive pressure gas rushing out of the fan casing 3 carries water vapor and breaks through the seal between the bearing side cover 4 and the fan shaft 1, entering the bearing box 2, thereby causing the oil in the bearing box 2 to emulsify.

[0018] like Figure 3 As shown, after installing the retaining ring 5 and the skeleton oil seal 7 of this application, the positive pressure gas rushing out of the fan casing 3 is diffused outward along the left side of the retaining ring 5 and the radial direction of the fan shaft 1 by the blocking effect of the retaining ring 5. Thus, most of the water vapor is isolated from entering the bearing housing 2 by the retaining ring 5. Furthermore, by installing the skeleton oil seal 7 on the bearing cover 6, the sealing performance is further improved, which can effectively prevent water vapor from entering the bearing housing 2, avoid oil emulsification, and extend the service life of the lubricating oil and the fan.

[0019] Example 2: like Figure 4 and Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that a protective cover 8 is fixedly installed on the retaining ring 5 by bolts. The protective cover 8 is circular with its opening facing the bearing side cover 4 and is coaxially arranged with the fan shaft 1. An annular baffle 9, coaxially arranged with the fan shaft 1, is integrally formed on the side of the bearing cover 6 near the fan housing 3. The annular baffle 9 extends into the opening of the protective cover 8, and a sealing ring 10 matching the opening of the protective cover 8 is embedded on the outer wall of the annular baffle 9. By setting the sealing ring 10, the entry of water vapor into the protective cover 8 can be effectively reduced, thereby further reducing the intrusion of water vapor into the bearing housing 2 through the bearing side cover 4 and the fan shaft 1.

[0020] An annular baffle 9 has a placement box 11 bonded or snapped into it. The placement box 11 is arc-shaped and surrounds the fan shaft 1. Two placement boxes 11 are arranged opposite each other, one above the other. The placement box 11 is filled with desiccant, and the side wall of the placement box 11 has a vent hole 12. The desiccant in the placement box 11 can absorb the small amount of moisture that enters the protective cover 8.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for preventing moisture intrusion into the bearing housing of a centrifugal fan, characterized in that: Includes a fan shaft (1), which passes through a bearing side cover (4) and a fan housing (3) in sequence. A retaining ring (5) is fixedly installed on the fan shaft (1) located between the bearing side cover (4) and the fan housing (3). The retaining ring (5) protrudes from the outer wall of the fan shaft (1) and has a mounting hole. The inner wall of the mounting hole is in contact with the outer wall of the fan shaft (1).

2. The sealing structure for preventing moisture intrusion into the bearing housing of a centrifugal fan as described in claim 1, characterized in that: A bearing cover (6) is also fixedly installed on the bearing side cover (4). The fan shaft (1) passes through the bearing cover (6). A skeleton oil seal (7) matching the outer wall of the fan shaft (1) is fixedly installed on the bearing cover (6).

3. The sealing structure for preventing moisture intrusion into the bearing housing of a centrifugal fan as described in claim 2, characterized in that: A protective cover (8) is fixedly installed on the retaining ring (5). The protective cover (8) is circular with its opening facing the bearing side cover (4) and is coaxial with the fan shaft (1). An annular baffle (9) coaxial with the fan shaft (1) is fixedly installed on the side of the bearing cover (6) near the fan housing (3). The annular baffle (9) extends into the opening of the protective cover (8).

4. The sealing structure for preventing moisture intrusion into the bearing housing of a centrifugal fan as described in claim 3, characterized in that: A sealing ring (10) matching the opening of the protective cover (8) is fixedly installed on the outer wall of the annular baffle (9).

5. The sealing structure for preventing moisture intrusion into the bearing housing of a centrifugal fan as described in claim 3, characterized in that: The annular baffle (9) is equipped with a placement box (11), which is filled with desiccant, and the side wall of the placement box (11) is provided with a vent hole (12).

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