Shaft end sealing structure and centrifugal fan applying same

Abstract

The utility model relates to the technical field of centrifugal fan shaft end sealing, in particular to a shaft end sealing structure and a centrifugal fan applying the same. A shaft end sealing structure comprises an outer layer sealing piece and an inner layer sealing piece which is arranged in the outer layer sealing piece and matched with the outer layer sealing piece. The inner-layer sealing piece is made of a flexible sealing material; the centrifugal fan comprises the shaft end sealing structure, a base, a driving piece arranged above the base, a volute arranged at the tail end of the driving piece and an impeller arranged in the volute, and the inner layer sealing piece is installed on the portion, between the driving piece and the impeller, of the main shaft. And the inner-layer sealing piece is arranged close to the outer wall of the volute. The shaft end sealing structure has the advantages of being good in sealing effect, low in cost and the like. The utility model further provides a centrifugal fan with the shaft end sealing structure, which has the advantages of high working efficiency, long service life, convenience in disassembly and assembly, low cost and the like.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan shaft end sealing technology, and in particular to a shaft end sealing structure and a centrifugal fan using the structure. Background Technology

[0002] Centrifugal fans are devices that utilize the principle of centrifugal force to transport and pressurize gas, and are widely used in industrial, commercial, and civil applications. They use a rotating impeller to generate centrifugal force, drawing gas from a low-speed region and accelerating it to a high-speed region, thereby achieving gas transport and pressure enhancement.

[0003] Chinese patent CN215109608U discloses an explosion-proof centrifugal fan, belonging to the field of fans, used for explosion protection. It includes a support frame, on which an explosion-proof motor is fixed. The explosion-proof motor drives a main shaft to rotate via an output shaft and transmission assembly. The main shaft is connected to an impeller via an explosion-proof shaft seal on the casing. The impeller is located inside the casing and driven by the main shaft. An air inlet is provided on the casing, and an explosion-proof ring is provided at the outlet end of the air inlet. The explosion-proof ring is located at the engagement point between the impeller and the air inlet. The explosion-proof shaft seal includes a sealing seat, a toothed labyrinth assembly, a gas equalization ring, a pressure cap, and graphite packing. The sealing seat is fixed to the casing and connected to the main shaft via the toothed labyrinth assembly, pressure cap, and graphite packing when the main shaft passes through the sealing seat. A gas equalization ring is also machined on the sealing seat, located between two adjacent toothed labyrinth assemblies and connected to an external compressed air interface. In view of the above technical solution, this application can improve the friction point of the explosion-proof fan, thereby improving the explosion-proof performance of the fan, making it suitable for places with low explosion-proof performance requirements, and expanding the application range of the explosion-proof fan.

[0004] However, the explosion-proof shaft seal of this technical solution consists of multiple components, and there will still be gaps between adjacent components. After long-term use, the gaps will increase due to the vibration of the motor and the rotation of the main shaft, resulting in poor sealing effect, which in turn leads to low working efficiency of the centrifugal fan. In addition, the workload of multiple components is large and disassembly and assembly are inconvenient. Utility Model Content

[0005] One of the purposes of this utility model is to address the shortcomings of the existing technology by providing a shaft end sealing structure that achieves complete sealing of the rotating shaft through the cooperation of an outer sealing element and an inner sealing element, thereby solving the problems of poor sealing effect and inconvenience in disassembling and assembling multiple components in the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A shaft end sealing structure includes: an outer sealing element and an inner sealing element disposed inside the outer sealing element and adapted to the outer sealing element.

[0008] Preferably, the inner side of the outer sealing element is provided with a plurality of protrusions, which are correspondingly disposed inside the inner sealing element.

[0009] Preferably, the inner sealing element is a flexible sealing material.

[0010] Preferably, the outer sealing element has a through-hole for oil injection.

[0011] Preferably, the oil injection hole is positioned opposite the outer wall of the inner sealing element.

[0012] Preferably, the oil injection hole and the protrusion do not interfere with each other.

[0013] Another objective of this invention is to address the shortcomings of existing technologies by providing a centrifugal fan that, through the installation of a double-layer shaft end sealing structure on the main shaft, allows the inner sealing element to directly contact and seal with the main shaft, forming a tight sealing surface that effectively prevents leakage of air, liquid, or other media. Direct contact ensures that the sealing gap between the sealing element and the main shaft is minimized, thereby improving the reliability of the seal.

[0014] To achieve the above objectives, this utility model provides the following technical solution:

[0015] A centrifugal fan includes: the aforementioned shaft end sealing structure, a base, a drive member disposed above the base, a volute disposed at the end of the drive member, and an impeller disposed inside the volute. The inner sealing member is mounted on the main shaft between the drive member and the impeller, and the inner sealing member is disposed close to the outer wall of the volute.

[0016] Preferably, an air inlet is provided on one side of the volute.

[0017] Preferably, an air outlet is provided at the top of the volute.

[0018] Preferably, a drain valve is provided at the bottom of the volute.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) This utility model enhances the sealing effect through double sealing. The outer sealing element can block external dust, impurities and other external objects from entering the interior, while the inner sealing element can further seal and prevent internal liquid or gas leakage, thereby greatly improving the reliability of the seal. Moreover, the cooperation between the outer and inner sealing elements can make the entire sealing structure more stable, reduce the sealing failure caused by uneven stress or deformation of the single-layer sealing element, enhance the stability of the sealing structure under various working conditions, and ensure work efficiency.

[0021] (2) This utility model provides several protrusions on the inner side of the outer sealing element, and the protrusions are correspondingly located inside the inner sealing element. The contact between the protrusions and the inner sealing element can increase the contact area between the two, making the seal tighter and better preventing the leakage of liquid or gas, thus improving the sealing performance. The protrusions can also play a certain limiting role, preventing the inner sealing element from shifting or deforming during operation, ensuring that the inner sealing element is always in the correct position and maintaining a good sealing state.

[0022] (3) This utility model uses a flexible sealing material as the inner sealing element. Because it has good flexibility and elasticity, it has a certain self-sealing ability. When the sealing gap changes, it can automatically adjust its shape to maintain the seal, thereby better adapting to the shape and size changes of the shaft end. Moreover, the flexible sealing material can produce a certain deformation when under pressure, thereby better filling the sealing gap and further improving the sealing performance.

[0023] In summary, this utility model has the advantages of good sealing effect, high working efficiency, long service life, convenient disassembly and assembly, and low cost. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0025] Figure 2 This is a front view of Embodiment 2 of the present invention;

[0026] Figure 3 This is a side view of Embodiment 2 of the present invention;

[0027] Figure 4 for Figure 3 Enlarged view of point A;

[0028] Figure 5 This is a top view of Embodiment 2 of the present invention. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a shaft end sealing structure, including: an outer sealing element 1 and an inner sealing element 2 disposed inside the outer sealing element 1 and adapted to the outer sealing element 1, which can form a double seal and enhance the sealing effect. The outer sealing element 1 can prevent external dust, impurities, etc. from entering the interior, while the inner sealing element 2 can further seal and prevent internal liquid or gas leakage, thereby greatly improving the reliability of the seal. Moreover, the cooperation between the outer sealing element 1 and the inner sealing element 2 can make the entire sealing structure more stable, reduce the sealing failure problem caused by uneven stress or deformation of the single-layer seal, enhance the stability of the sealing structure under various working conditions, and the cost of double sealing is low.

[0033] The outer sealing element 1 has a plurality of protrusions 11 on its inner side. The protrusions 11 are correspondingly disposed inside the inner sealing element 2. The contact between the protrusions 11 and the inner sealing element 2 can increase the contact area between the two, making the seal tighter and better preventing the leakage of liquid or gas, thus improving the sealing performance.

[0034] At the same time, the protrusion 11 can play a certain limiting role, preventing the inner sealing element 2 from shifting or deforming during operation, ensuring that the inner sealing element 2 is always in the correct position and maintaining a good sealing state.

[0035] In this embodiment, the inner sealing element 2 is a flexible sealing material. The flexible sealing material has good flexibility and elasticity, that is, it has a certain self-sealing ability. When the sealing gap changes, it can automatically adjust its shape to maintain the seal, thereby better adapting to the shape and size changes of the shaft end. Moreover, the flexible sealing material can produce a certain deformation when under pressure, thereby better filling the sealing gap and further improving the sealing performance.

[0036] In this embodiment, the flexible sealing material typically has good wear resistance and anti-aging properties, and can maintain good sealing performance for a long time, thereby extending the service life of the sealing structure and reducing maintenance costs.

[0037] In this embodiment, an oil injection hole 12 is provided through the outer sealing element 1. The oil injection hole 12 can conveniently inject lubricating oil into the sealing structure to lubricate the shaft end and the sealing element. Good lubrication can reduce the friction between the shaft end and the inner sealing element 2, reduce wear, and extend service life.

[0038] Of course, the oil injection hole 12 is set directly opposite the outer wall of the inner layer seal 2, so that the lubricating oil can act directly on the outer wall of the inner layer seal 2, thereby better lubricating the contact surface between the inner layer seal 2 and the shaft, improving the lubrication effect, and reducing friction and wear.

[0039] In addition, the oil injection hole 12 and the protrusion 11 do not interfere with each other, which can ensure that the protrusion 11 can play a sealing and limiting role while the oil injection hole 12 can work normally. The sealing performance or the injection of lubricating oil will not be affected by mutual interference, and the structural design is reasonable.

[0040] Example 2

[0041] like Figures 2-5 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0042] This embodiment provides a centrifugal fan, including: a shaft end sealing structure as described above, a base 3, a drive member 4 disposed above the base 3, a volute 5 disposed at the end of the drive member 4, and an impeller 6 disposed inside the volute 5. The inner sealing member 2 is installed on the main shaft 41 between the drive member 4 and the impeller 6, and the inner sealing member 2 is disposed close to the outer wall of the volute 5, which can effectively prevent air leakage from the gap between the main shaft 41 and the volute 5 and improve the working efficiency of the centrifugal fan.

[0043] In the shaft end sealing structure, the inner sealing element 2 is in direct contact with the main shaft 41, forming a tight sealing surface that effectively prevents leakage of air, liquid, or other media. Direct contact ensures that the sealing gap between the sealing element and the main shaft 41 is minimized, thereby improving the reliability of the seal. It also ensures uniform pressure distribution, avoids excessive local pressure that could cause premature damage to the sealing element, ensures the service life of the sealing structure, and thus extends the service life of the centrifugal fan.

[0044] Meanwhile, the double-layer configuration of the outer seal 1 and the inner seal 2 can prevent external dust and impurities from entering the impeller 6 and the drive component 4, protecting them from wear and corrosion and extending the service life of the equipment.

[0045] In this embodiment, an air inlet 51 is provided on one side of the volute 5, preferably in a horizontal direction, which allows air to enter the volute 5 more smoothly, reducing resistance and turbulence when air enters, thereby improving the suction efficiency of the fan.

[0046] In this embodiment, the top of the volute 5 is provided with an air outlet 52, that is, the air outlet 52 is set vertically upward. The vertically upward air outlet 52 can make the air more smoothly discharged, reduce the resistance when the air is discharged, and improve the exhaust efficiency of the fan.

[0047] Of course, the bottom of the volute 5 is equipped with a drain valve 53, which can conveniently drain the water inside the volute 5 to ensure the safety of the staff during maintenance. It is generally used in some specific industrial environments, such as chemical and pharmaceutical industries, where there may be a risk of humid air or liquid leakage. When the motor stops running or under certain special circumstances (such as equipment cleaning, pipe rupture, etc.), water may enter the volute 5.

[0048] In addition, the motor is preferably an explosion-proof motor, and its output shaft is equipped with a transmission group 7, which drives the main shaft 41 to rotate, and then drives the impeller 6 to rotate.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shaft end sealing structure, characterized in that, include: An outer sealing element and an inner sealing element disposed inside the outer sealing element and adapted to the outer sealing element, wherein the inner side of the outer sealing element is provided with a plurality of protrusions, the protrusions being correspondingly disposed inside the inner sealing element.

2. The shaft end sealing structure according to claim 1, characterized in that, The inner sealing element is made of flexible sealing material.

3. The shaft end sealing structure according to claim 1, characterized in that, An oil injection hole is provided through the outer sealing element.

4. The shaft end sealing structure according to claim 3, characterized in that, The oil injection hole is located directly opposite the outer wall of the inner sealing element.

5. The shaft end sealing structure according to claim 3, characterized in that, The oil injection hole and the protrusion do not interfere with each other.

6. A centrifugal fan, characterized in that, include: A shaft end sealing structure, a base, a drive member disposed above the base, a volute disposed at the end of the drive member, and an impeller disposed inside the volute, as described in any one of claims 1-5, wherein the inner sealing member is mounted on the main shaft between the drive member and the impeller, and the inner sealing member is disposed close to the outer wall of the volute.

7. A centrifugal fan according to claim 6, characterized in that, An air inlet is provided on one side of the volute.

8. A centrifugal fan according to claim 7, characterized in that, An air outlet is provided at the top of the volute.

9. A centrifugal fan according to claim 8, characterized in that, A drain valve is provided at the bottom of the volute.

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