Axial sealing structure of centrifugal fan

Abstract

The utility model discloses an axial sealing structure of a centrifugal fan, which relates to the technical field of centrifugal fan sealing and comprises a first stuffing box, a sealing box, a second stuffing box and a stuffing gland. The outer end of the first stuffing box is axially and upwards provided with a sealing box, the sealing box faces a boss at the outer end of the first stuffing box to be used for pressing stuffing to achieve secondary sealing, the tail end of the sealing box is connected with the second stuffing box to achieve the third-time sealing effect, and a stuffing gland is additionally arranged at the outer end of the second stuffing box. According to the utility model, the triple sealing effect is achieved, the gas leakage is greatly reduced, the installation mode among the first stuffing box, the sealing box, the second stuffing box and the stuffing gland is simple and easy to operate, the transformation period and the subsequent maintenance operation are shortened, and the use effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan sealing technical field, specifically, relate to a kind of axial sealing structure of centrifugal fan. BACKGROUND

[0002] Centrifugal fan is relied on inputted mechanical energy, improves gas pressure and sends gas, it is a kind of driven fluid machinery.In POM powder conveying system in polyformaldehyde production workshop processing, centrifugal fan is usually used to provide power, in use process, centrifugal fan is sent into powder buffer bin for production with powder in homogenizing bin, so continuous operation.

[0003] But traditional centrifugal fan uses the structure of single-side air intake, single-layer packing seal is used in impeller back side, packing gland is installed outside packing gland to heat bearing box, since its structure design, there is slight gas leakage at packing place;But from the actual demand situation of polyformaldehyde production workshop, leaked gas contains trace formaldehyde, benzene and other volatile gases, which is extremely harmful to human body. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems in the above background technical field, and further provides an axial sealing structure of centrifugal fan.

[0005] The utility model solves the technical problems by adopting the technical scheme that

[0006] An axial sealing structure of centrifugal fan, including first packing gland, sealing gland, second packing gland and packing gland;Sealing gland is arranged axially on the outer end of the first packing gland, and the sealing gland is arranged towards the outer end of the first packing gland to press the packing and achieve secondary sealing;The tail end of the sealing gland is connected with the second packing gland to achieve the effect of three times sealing, and the outer end of the second packing gland is additionally provided with a packing gland.

[0007] Further, the sealing gland is a nitrogen sealing gland, nitrogen is introduced as a sealing medium to prevent gas leakage from the adjacent joint surfaces, and to prevent external impurities such as dust and moisture from entering.

[0008] Further, the sealing gland is a vacuum sealing gland, which removes oxygen and moisture from the air, and uses a specific sealing design to achieve sealing, thereby preventing gas leakage.

[0009] Further, it further includes a circular ring, which is welded at one end of the first packing gland away from the sealing gland, and the packing depth at one end of the first packing gland is increased by deepening axially based on the first packing gland, so that multiple layers of packing can be placed for sealing, thereby improving the sealing effect.

[0010] Further, the circular ring and the first packing gland are welded to improve the sealing effect of both.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The utility model discloses a first packing gland, a sealing gland, a second packing gland and packing gland's setting, has reached three -fold sealing effect, has reduced the leakage of gas greatly, and first packing gland, sealing gland, second packing gland and packing gland between installation mode simple easy operation, have shortened the reform period and subsequent maintenance operation, have better use effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the installation position schematic diagram of the circular ring;

[0015] Among them: 1, first packing gland;2, sealing gland;3, second packing gland;4, packing gland;5, circular ring. PREFERRED EMBODIMENT

[0016] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model. The utility model is further illustrated in combination with the drawings and the embodiments:

[0017] Referring to the drawings Figure 1 The axial sealing structure of the centrifugal fan includes a first packing gland 1, a sealing gland 2, a second packing gland 3 and a packing gland 4. The sealing gland 2 is arranged axially on the outer end of the first packing gland 1, and the sealing gland 2 is towards the outer end boss of the first packing gland 1 for pressing the packing to play a secondary sealing. The tail end of the sealing gland 2 is connected with the second packing gland to achieve a three-time sealing effect, and the outer end of the second packing gland 3 is additionally provided with the packing gland 4.

[0018] In one of the schemes, the sealing gland 2 is a nitrogen sealing gland 2. Nitrogen is introduced as a sealing medium to prevent gas from leaking from the adjacent joint surfaces and to prevent external impurities such as dust and moisture from entering. In this case, the nitrogen sealing gland 2 is radially provided with a nitrogen inlet hole. By controlling the pressure and flow of nitrogen, the sealing effect is achieved.

[0019] In another scheme, the sealing case 2 is a vacuum sealing case 2, which is sealed by excluding oxygen and moisture in the air and adopting a special sealing design to avoid gas leakage.

[0020] The axial sealing structure of the centrifugal fan greatly reduces the gas leakage through the triple sealing, and the installation mode among the first packing case 1, the sealing case 2, the second packing case 3 and the packing gland 4 is simple and easy to operate, which shortens the reform period and subsequent maintenance operation and has better use effect.

[0021] In the implementation process, the sealing effect of the end of the first packing case 1 away from the sealing case 2 is considered, and the packing depth is considered. Figure 2 As shown in the accompanying drawings, the axial sealing structure of the centrifugal fan further comprises a ring 5 welded at the end of the first packing case 1 away from the sealing case 2, which increases the packing depth of the end of the first packing case 1 by deepening the first packing case 1 in the axial direction, so that multiple layers of packing can be placed for sealing, thereby improving the sealing effect.

[0022] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above implementation and description in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An axial sealing structure of a centrifugal fan, characterized in that: it comprises a first packing gland (1), a sealing gland (2), a second packing gland (3) and a packing gland cover (4); the sealing gland (2) is arranged axially on the outer end of the first packing gland (1), and the sealing gland (2) is towards the boss on the outer end of the first packing gland (1); the tail end of the sealing gland (2) is connected with the second packing gland (3), and the outer end of the second packing gland (3) is additionally provided with the packing gland cover (4).

2. The axial sealing structure of the centrifugal fan according to claim 1, characterized in that: the sealing gland (2) is a nitrogen sealing gland (2).

3. The axial sealing structure of the centrifugal fan according to claim 1, characterized in that: the sealing gland (2) is a vacuum sealing gland (2).

4. The axial sealing structure of the centrifugal fan according to claim 1, characterized in that: it further comprises a circular ring (5); the circular ring (5) is arranged on the end of the first packing gland (1) away from the sealing gland (2).

5. The axial sealing structure of the centrifugal fan according to claim 4, characterized in that: the circular ring (5) is welded with the first packing gland (1).

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