Shaft seal structure of framework oil seal applied to ventilator

Abstract

The utility model belongs to the technical field of ventilator shaft seals, and particularly relates to a shaft seal structure of a fan applying framework oil seals, which comprises a sealing cavity, framework oil seals, a gland and a main shaft, the main shaft is connected in the sealing cavity through a bearing, the sealing cover is connected with the sealing cavity, two sides of the sealing cavity are symmetrically connected with the framework oil seals, and the framework oil seals are connected with the gland. The sealing cavity is further provided with a grease adding hole and an exhaust hole. The pressing plate is connected to the side, away from the sealing cover, of the main shaft. Compared with the prior art, the framework oil seal is used for sealing grease in the wall, the contact gap between the framework oil seal and the shaft sleeve is small, the sealing capacity is high, and leakage is little.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilator shaft seals, and particularly relates to a shaft seal structure of a ventilator applying a skeleton oil seal. Background Art

[0002] Generally, the shaft seal device of a ventilator is generally a packing seal. Common packings include packing ropes, wool felts, etc. With the long-term operation of the fan and the characteristics of the sealing material itself, the continuous friction between the packing and the shaft will cause the packing to wear and deform, and the installation gap will become larger, resulting in gas leakage. To prevent this situation, only regular maintenance and regular replacement of the packing can be carried out, which wastes manpower and material resources and pollutes the on-site working environment. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model develops a shaft seal structure of a ventilator applying a skeleton oil seal. By using the grease inside the sealing wall to seal with the skeleton oil seal, the contact gap between the skeleton oil seal and the shaft sleeve is small, the sealing ability is strong, and the leakage is less.

[0004] The technical solution for the utility model to solve the technical problem is: a shaft seal structure of a fan applying a skeleton oil seal, including a sealing cavity, a skeleton oil seal, a gland, and a main shaft. The main shaft is connected to the sealing cavity through bearings. The sealing cover is connected to the sealing cavity. Skeleton oil seals are symmetrically connected to both sides of the sealing cavity. A grease filling hole and an exhaust hole are also provided on the sealing cavity. The pressing plate is connected to the side of the main shaft far from the sealing cover.

[0005] Preferably, an automatic grease injector is connected to the grease filling hole.

[0006] Preferably, a shaft sleeve with a labyrinth groove is provided on the sealing cover.

[0007] Preferably, sealing bolts are threadedly connected in the grease filling hole and the exhaust hole.

[0008] Preferably, the skeleton oil seal is made of fluororubber.

[0009] The effects provided in the content of the utility model are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solutions have the following advantages or beneficial effects:

[0010] 1. By using the grease inside the sealing wall to seal with the skeleton oil seal, the contact gap between the skeleton oil seal and the shaft sleeve is small, the sealing ability is strong, and the leakage is less. At the same time, it is paired with a shaft sleeve with a labyrinth groove to seal, and the fan can be sealed through multiple channels. By utilizing their respective advantages, the leakage risk when a single seal leaks and fails can be effectively prevented, and the leakage amount of the fan can be minimized;

[0011] 2. The shaft seal using a skeleton oil seal has a better sealing effect compared to the commonly used shaft seals in existing fans, such as carbon ring seals and negative pressure grease injection seals. Its production cost is lower. This shaft seal device is convenient and simple to process, has low processing precision requirements, and is easy to install. It can effectively reduce the production cost of manufacturers while achieving a good sealing effect;

[0012] 3. The accessories of the present utility model are convenient to replace and have a wide range of applications. As a conventional standard accessory, the skeleton oil seal is easy to purchase and replace. There are a wide variety of skeleton oil seals, with mature technology, stable quality, and long service life. Different types of skeleton oil seals can be selected for this shaft seal structure according to different operating conditions;

[0013] 4. By setting an automatic greaser, it is ensured that the grease is always in a full state, ensuring the sealing effect. The shaft sleeve part in the sealing cavity has labyrinth grooves, which increase and make uniform the contact surface between the grease and the shaft sleeve, and can better prevent leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial sectional view of the main view of the spindle of the present utility model;

[0015] Figure 2 It is a partial sectional view of the left view of the present utility model.

[0016] Wherein: 1, sealing cavity; 2, skeleton oil seal; 3, gland; 4, sealing cover; 41, shaft sleeve with labyrinth grooves; 5, automatic greaser; 6, grease filling hole; 7, exhaust hole; 8, main shaft; 9, sealing bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to clearly illustrate the technical features of this solution, the present utility model will be described in detail below through specific embodiments and in conjunction with its drawings.

[0018] Embodiment 1

[0019] See Figures 1 to 2, A shaft seal structure of a fan using a skeleton oil seal, including a sealing cavity 1, a skeleton oil seal 2, a gland 3 and a main shaft 8. The main shaft 8 is connected to the sealing cavity 1 through a bearing. The sealing cover 4 is connected to the sealing cavity 1. The skeleton oil seals 2 are symmetrically connected to both sides of the sealing cavity 1. A grease filling hole 6 and an exhaust hole 7 are also provided on the sealing cavity 1. The exhaust hole 7 is used to discharge the air in the sealing cavity, maintain the internal and external air pressure balance, and ensure the sealing effect. The pressing plate is connected to the side of the main shaft 8 far from the sealing cover 4. The skeleton oil seal 2 seals the grease inside the sealing cavity 1 to prevent a large amount of grease from flowing out. The oil film formed between the skeleton oil seal 2 and the shaft sleeve seals the casing gas. The skeleton oil seal 2 can also isolate particulate impurities such as dust to the outside of the sealing cavity 1 to prevent grease contamination. The supporting automatic greasing device 5 always ensures that the grease is in a full state to ensure the sealing effect. The shaft sleeve part in the sealing cavity 1 is provided with a labyrinth groove to increase the contact area between the grease and the shaft sleeve and make it uniform.

[0020] As Figure 1 and Figure 2 shown, an automatic greasing device 5 is connected to the grease filling hole 6.

[0021] As Figure 1 shown, a shaft sleeve 41 with a labyrinth groove is provided on the sealing cover 4. The shaft sleeve 41 with a labyrinth groove is used to slow down the flow rate and pressure of the leakage medium, so that the medium gas forms a vortex at the labyrinth.

[0022] As Figure 2 shown, a sealing bolt 9 is threadedly connected in the grease filling hole 6 and the exhaust hole 7.

[0023] The skeleton oil seal 2 is made of fluororubber or alloy material.

[0024] Working principle

[0025] The shaft seal structure of the present utility model using the skeleton oil seal 2 mainly achieves good sealing through the coordinated action of each part. Utilizing the close contact between the skeleton oil seal 2 and the shaft sleeve, with its small gap and strong sealing ability, the leakage amount is reduced. At the same time, it is paired with a shaft sleeve 41 with a labyrinth groove to further increase the sealing path and reduce the risk of single seal failure, thereby controlling the fan leakage amount to the lowest level. By setting the automatic greasing device 5, the grease is always kept in a full state to ensure the sealing effect, and the labyrinth groove on the shaft sleeve increases the contact area between the grease and the shaft sleeve and makes it evenly distributed, further enhancing the anti-leakage ability. According to the sealing effect and the size of the on-site installation space, packing ropes can be paired outside the skeleton oil seal 2 to achieve a better sealing effect.

[0026] Although the specific implementation manners of the present utility model have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present utility model. Based on the technical solutions of the present utility model, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present utility model.

Claims

1. A shaft seal structure using a skeleton oil seal for a fan, characterized in that: The invention comprises a sealing cavity (1), a skeleton oil seal (2), a pressure cover (3) and a main shaft (8), wherein the main shaft (8) is connected to the sealing cavity (1) via a bearing, the sealing cavity (1) is connected to a sealing cover (4), the two sides of the sealing cavity (1) are symmetrically connected to the skeleton oil seals (2), the sealing cavity (1) is also provided with a grease filling hole (6) and an exhaust hole (7), and the main shaft (8) is connected to a pressure plate on a side away from the sealing cover (4).

2. A shaft seal structure for a fan using a skeleton oil seal according to claim 1, characterized in that: The greasing hole (6) is connected to an automatic greasing device (5).

3. The shaft seal structure of a fan using a skeleton oil seal according to claim 1, characterized in that: The sealing cover (4) is provided with a shaft sleeve (41) with a labyrinth groove.

4. The shaft seal structure of a fan using a skeleton oil seal according to claim 1, characterized in that: The grease filling hole (6) and the exhaust hole (7) are threadedly connected with a sealing bolt (9).

5. The shaft seal structure of a fan using a skeleton oil seal according to claim 1, characterized in that: The skeleton oil seal (2) is made of fluororubber.

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