Centrifugal pump bearing box sealing structure with air cooling function

Abstract

The utility model discloses a centrifugal pump bearing box sealing structure with air -cooled function, including dustproof disc, the dustproof disc is installed on the shaft, is equipped with a plurality of mounting holes on the dustproof disc, installs the jackscrew in the mounting hole, the dustproof disc is fixedly connected on the shaft through the jackscrew, the dustproof disc has the air -cooled blade on, install O ring between the dustproof disc with the shaft, the dustproof disc is located in the bearing box, and the dustproof disc with the bearing box adopts the labyrinth seal between. The utility model has solved the high cost of mechanical oil seal sealing in the prior art, and the complex working condition of skeleton oil seal sealing cannot cope with centrifugal pump, and the problems such as high temperature frequent failure of existing dustproof disc labyrinth seal wear part.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump sealing technology, and in particular to a centrifugal pump bearing housing sealing structure with air cooling function. Background Technology

[0002] Currently, the existing centrifugal pump bearing housing sealing structures in the industry generally include three types: mechanical oil seal (isolation device) seal, skeleton oil seal seal, and dustproof disc labyrinth seal.

[0003] The first type of mechanical oil seal (isolation device) has a good sealing effect, but the procurement cost is high. Most centrifugal pumps use oil bath lubrication, and this type is not used unless necessary.

[0004] The second type of skeleton oil seal, although low in cost and easy to purchase, requires regular replacement of its sealing lip and shaft contact seal. Furthermore, its exposed rubber parts are not suitable for the complex and harsh operating conditions of centrifugal pumps and are prone to aging and oil leakage, so it is rarely used in the industry.

[0005] The third type is the dust pan labyrinth seal. This structure relies on a non-contact seal formed by an oil film generated between the dust pan and the bearing housing during operation. Theoretically, it has an unlimited lifespan. Made of metal (usually cast copper), it is easy to process and has a low cost, making it suitable for various complex operating conditions. However, in actual operation, it generates significant heat due to the resistance from the oil film's molecular tension and improper fit with adjacent components (such as the housing and gland), leading to frictional losses. This causes the dust pan to overheat, resulting in oil leakage from the O-ring seal to the shaft, requiring periodic replacement. Conversely, shortening the labyrinth mating surface to reduce heat generation can also lead to insufficient sealing area and leakage.

[0006] In view of the problems existing in the above-mentioned prior art, it is necessary to study and design a new centrifugal pump bearing housing sealing structure with air cooling function, so as to overcome the problems existing in the prior art. Utility Model Content

[0007] The purpose of this invention is to provide a centrifugal pump bearing housing sealing structure with air cooling function to solve the problems existing in the prior art. Under the premise of ensuring the sealing effect of the bearing housing, it solves the problem of dustproof disc O-ring failure due to high temperature aging in a low-cost manner.

[0008] To achieve the above objectives, this utility model provides the following solution: This utility model provides a centrifugal pump bearing housing sealing structure with air cooling function, comprising:

[0009] A dustproof disc is mounted on a shaft. The dustproof disc has several mounting holes, and set screws are installed in the mounting holes. The dustproof disc is fixedly connected to the shaft by the set screws. The dustproof disc has air-cooling blades. An O-ring is installed between the dustproof disc and the shaft. The dustproof disc is located in a bearing housing. A labyrinth seal is used between the dustproof disc and the bearing housing.

[0010] The present invention discloses the following technical effects:

[0011] 1. The present invention provides a novel centrifugal pump bearing housing sealing structure with air cooling function. Compared with mechanical oil seal (isolation device) seal, it has a lower cost while ensuring the sealing effect of the bearing housing. Moreover, after adding air cooling blades, the replacement cycle of vulnerable parts (O-ring seals) is longer.

[0012] 2. The present invention provides a novel centrifugal pump bearing housing sealing structure with air cooling function. Compared with the skeleton oil seal, the dustproof disc has a longer service life, the main body is not a vulnerable part and does not need to be replaced regularly, and it has a wide range of applications and can adapt to various complex working conditions of centrifugal pump operation.

[0013] 3. The present invention provides a novel centrifugal pump bearing housing sealing structure with air cooling function. Compared with the existing dustproof disc labyrinth seal on the market, it can achieve continuous heat dissipation by rotating its own blades. It solves the problem of frequent replacement of wear parts (O-rings) due to the high operating temperature of existing dustproof discs.

[0014] This invention solves the problems of high sealing cost of mechanical oil seals (isolation devices), inability of skeleton oil seals to cope with the complex working conditions of centrifugal pumps, and frequent failure of easily damaged parts of existing dustproof disc labyrinth seals at high temperatures in the prior art. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in 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.

[0016] Figure 1 This is a schematic diagram of the sealing structure of the bearing housing of the centrifugal pump with air cooling function according to this utility model;

[0017] Figure 2 This is a cross-sectional view and front view of the dustproof tray of this utility model.

[0018] Figure 3 The dustproof tray of this utility model is three-dimensional. Figure 1 ;

[0019] Figure 4 The dustproof tray of this utility model is three-dimensional. Figure 2 ;

[0020] Among them, 1. bearing housing; 2. dustproof disc; 3. O-ring; 4. set screw; 5. shaft; 6. air-cooled blade. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

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

[0023] Reference Figure 1-4 This utility model provides a centrifugal pump bearing housing sealing structure with air cooling function, comprising:

[0024] Dustproof disc 2 is mounted on shaft 5. Several mounting holes are provided on dustproof disc 2, and set screws 4 are installed in the mounting holes. Dustproof disc 2 is fixedly connected to shaft 5 by set screws 4. Dustproof disc 2 has air-cooling blades 6. An O-ring 3 is installed between dustproof disc 2 and shaft 5. Dustproof disc 2 is located in bearing housing 1. A labyrinth seal is used between dustproof disc 2 and bearing housing 1.

[0025] In this device, as shown in the figure, both the dustproof disc 2 and the bearing housing 1 are equipped with labyrinth seal annular grooves, which can ensure that an oil film is quickly formed during operation to provide sealing. The air-cooled blades 6 on the dustproof disc 2 can carry away the generated heat by rotating the blades themselves, thereby achieving the purpose of continuous heat dissipation, reducing the operating temperature and extending the service life of the O-ring 3.

[0026] The air-cooled blades 6 on the dustproof tray 2 are cast in one piece (usually cast copper), which is simple to process, has strong thermal conductivity, good heat dissipation effect, and certain corrosion resistance. The structure is highly versatile and can be applied to most specifications of labyrinth seal bearing housings 1 in the industry.

[0027] The dustproof tray 2 and the shaft 5 are fixed with double top screws 4. The rotation of the shaft drives the air-cooling blades 6 on the dustproof tray 2 to rotate and dissipate heat, without the need for a separate power source for heat dissipation.

[0028] The dustproof tray 2 is made of one-piece casting (usually cast copper), which is simple to process and low in cost. The material has strong thermal conductivity, good heat dissipation effect and a certain degree of corrosion resistance.

[0029] The radial dimension of the air-cooling blades 6 on the dustproof tray 2 is the same as the maximum outer circle of the dustproof tray 2, and the axial dimension is flush with the end face. While ensuring the air-cooling effect, it reduces spatial interference and can directly replace the ordinary dustproof tray 2.

[0030] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A sealing structure for a centrifugal pump bearing housing with air cooling function, characterized in that, include: A dustproof disc (2) is mounted on a shaft (5). The dustproof disc (2) has several mounting holes, and a set screw (4) is installed in each mounting hole. The dustproof disc (2) is fixedly connected to the shaft (5) by the set screw (4). The dustproof disc (2) has air-cooling blades (6). An O-ring (3) is installed between the dustproof disc (2) and the shaft (5). The dustproof disc (2) is located inside the bearing housing (1). A labyrinth seal is used between the dustproof disc (2) and the bearing housing (1).

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