Dual-seal structure for fan
By adding carbon ring seals and air pressure seals to the fan sealing structure and using nitrogen pressure to prevent leaking gas, the leakage problem of fan seals in high pressure differential and dusty environments is solved, improving the reliability and lifespan of the seal.
Patent Information
- Application Number
- CN202521200594.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-12
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-06-12
AI Technical Summary
Existing fan sealing structures are prone to leakage under high pressure differential and dusty environments, leading to gas leakage and dust entering the bearing system, shortening seal life, increasing maintenance costs and downtime risks.
Two carbon ring sealing structures are added before the mechanical seal, and the mechanical seal is combined with a nitrogen-filled pressure seal to prevent leaked gas from entering the mechanical seal.
It effectively prevents gas leakage and dust ingress, extends seal life, reduces maintenance frequency, and improves the reliability of fan operation.
Smart Images
Figure CN223814155U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a fan seal field, concretely relates to a double seal structure for fan. BACKGROUND
[0002] In the operation process of the fan (especially Roots blower, screw blower and other gas conveying equipment), the position of the main shaft penetrating the fan shell and the bearing seat is the key sealing point for preventing internal gas or dust leakage. The sealing failure at this position not only causes process gas leakage loss and environmental pollution, but also may cause external dust to enter the bearing system, accelerate bearing wear, and even cause equipment failure.
[0003] At present, the commonly used sealing form of this part is mechanical seal. Although the mechanical seal has reliable performance, it still faces challenges when facing the high gas pressure inside the fan, possible pressure fluctuation and medium containing dust or particles. Especially in the condition of large pressure difference, the medium is easy to leak through the gap between the dynamic and static rings of the mechanical seal. Once the dust and other particles invade the working cavity of the mechanical seal, the wear of the sealing end face will be aggravated, the service life of the seal will be significantly shortened, the maintenance cost and downtime risk will be increased. In addition, the reliability of single mechanical seal under extreme working conditions is sometimes difficult to fully guarantee.
[0004] Therefore, in order to solve the above problems, a double seal structure for fan is proposed. CONTENT OF THE UTILITY MODEL
[0005] The utility model is just for the above-mentioned problems, and a double seal structure for fan is designed. The device increases two carbon rings at the front end of the mechanical seal, and nitrogen is filled in the interface between the carbon ring and the machine seal body. The pressure of nitrogen is slightly higher than the internal pressure of the fan. If the gas inside the fan leaks through the carbon ring, nitrogen can push the leaked gas back, so that the gas does not leak into the machine seal.
[0006] In order to achieve the above purpose, the utility model provides a double seal structure for fan, which comprises a gas pressure seal and a mechanical seal. The gas pressure seal and the mechanical seal are installed on the shaft sleeve of the main shaft and located between the fan shell and the bearing seat. One end of the gas pressure seal is in contact with the fan shell, and the other end is fixedly connected with one end of the mechanical seal. A gap is provided between the end of the gas pressure seal close to the fan shell and the shaft sleeve.
[0007] In the above manner, the gas pressure seal is arranged between the mechanical seal and the fan shell. When the fan shell leaks, the gas pressure seal will first play the effect of plugging.
[0008] Further, the air pressure seal comprises an air filling ring, a gasket ring and a carbon ring, the gasket ring is sleeved on the shaft sleeve and is in abutting connection with the fan casing, one end of a tooth end wall plate is fixedly connected with the fan casing and the other end is fixedly connected with the bearing seat, the gasket ring has the same thickness as the side wall of the tooth end wall plate, the air filling ring is installed on the shaft sleeve and is fixedly connected with the gasket ring and the tooth end wall plate, and the carbon ring is sleeved on the shaft sleeve and is located between the gasket ring and the air filling ring.
[0009] Further, the air filling ring comprises an air filling port and a gas channel, the inner wall of the air filling ring has a stepped platform, the inner wall of the air filling ring is in matched connection with the mechanical seal and the side part is fixedly connected with the mechanical seal, the air filling port is arranged on the top of the air filling ring, one end of the gas channel is communicated with the air filling port and the other end penetrates the inner wall of the air filling ring, and a gap is arranged between the inner wall of the air filling ring and the shaft sleeve.
[0010] Further, one side of the carbon ring is provided with the gap and the other side is provided with the gap between the air filling ring and the shaft sleeve.
[0011] In the above manner, when air medium leaks into the gap through the fan casing, the pressurized gas pushes against the carbon ring through the gas channel, the pressure of the gas is slightly higher than the pressure inside the fan, so that the gas is prevented from leaking into the mechanical seal.
[0012] Further, the gas channel is in an inclined straight line structure.
[0013] Further, the mechanical seal comprises a cold static ring seat and a static ring, the cold static ring seat is located outside the mechanical seal and is fixedly connected with the side surface of the air filling ring, the static ring is located at the end of the mechanical seal and is in matched connection with the stepped platform of the inner wall of the air filling ring, and a seal liquid inlet and outlet that is communicated with the mechanical seal is arranged on the cold static ring seat.
[0014] Further, the carbon ring is connected with the gasket ring through the anti-rotation pin, and the lower stepped platform of the air filling ring is connected with the static ring through the anti-rotation pin.
[0015] Further, the air pressure seal is connected with an external pressurized gas supply device.
[0016] In summary, the air pressure seal has the following advantages and beneficial technical effects:
[0017] 1. The air pressure seal can run for a long time in harsh conditions, prevent the gas with corrosion ability from polluting the mechanical seal and causing damage to the mechanical seal, and affect the running effect of the fan.
[0018] 2. This utility model can exert a force on the carbon ring through pressurized gas, which is equal to the force received by the carbon ring due to gas leakage, thus preventing seal failure;
[0019] 3. The pneumatic seal of this utility model can be used in combination with the mechanical seal, which improves the sealing effect on the fan shaft. Attached Figure Description
[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0021] Figure 1 This is a schematic diagram of the structure of a double-sealing structure for a fan after installation according to this utility model;
[0022] Figure 2 This is a schematic diagram of a double-sealing structure for a fan according to this utility model;
[0023] Figure 3 This is the utility model Figure 2 Enlarged view of A in the middle;
[0024] Figure 4 This is a utility model Figure 1 A magnified view of B in the middle.
[0025] The reference numerals in the attached figures are:
[0026] 1-Pressure seal; 11-Inflation ring; 111-Inflation port; 112-Gas passage; 12-Washer ring; 13-Carbon ring;
[0027] 2-Mechanical seal; 21-Cooling ring seat; 22-Stationary ring;
[0028] 3-Fan housing; 4-Main shaft; 41-Shaft sleeve; 5-Bearing housing; 6-Gear end wall plate; 7-Anti-rotation pin; 8-Clearance. Detailed Implementation
[0029] The following is in conjunction with the appendix Figures 1-4 The present invention will be further described in detail below. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning. All parts and equipment use conventional models found in the prior art, and the circuit connections employ conventional connection methods found in the prior art, which will not be detailed here. Content not described in detail in this specification belongs to prior art known to those skilled in the art.
[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the device includes a pneumatic seal 1 and a mechanical seal 2. Both pneumatic seal 1 and mechanical seal 2 are mounted on the bushing 41 of the main shaft 4, located between the fan housing 3 and the bearing seat 5. One end of the pneumatic seal 1 is in contact with the fan housing 3, and the other end is fixedly connected to one end of the mechanical seal 2 by a set bolt. A gap 8 is provided between the end of the pneumatic seal 1 near the fan housing 3 and the bushing 41. The pneumatic seal 1 is connected to an external pressurized gas supply device.
[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the pneumatic seal 1 includes an inflation ring 11, a gasket 12, and a carbon ring 13. The gasket 12 is fitted onto the bushing 41 and abuts against the fan housing 3. One end of the toothed end wall plate 6 is bolted to the fan housing 3, and the other end is bolted to the bearing seat 5. The sidewall thickness of the gasket 12 and the toothed end wall plate 6 are equal. The inflation ring 11 is attached to the gasket 12 and the toothed end wall plate 6. The inflation ring 11 is mounted on the bushing 41 and bolted to both the gasket 12 and the toothed end wall plate 6. The carbon ring 13 is fitted onto the bushing 41 and located between the gasket 12 and the inflation ring 11. A stepped platform is provided on the inner wall of the gasket 12, and the carbon ring 13 is tangentially fitted onto the bushing 41 within the stepped platform.
[0034] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 indicated, the air charging ring part 11 includes an air charging port 111 and a gas passage 112, the inner wall of the air charging ring part 11 has a stepped platform, the inner wall stepped platform of the air charging ring part 11 is connected with the mechanical seal 2 in cooperation, and the side part is fixedly connected with the mechanical seal 2 through bolts, the air charging port 111 is arranged on the top of the air charging ring part 11, one end of the gas passage 112 is communicated with the air charging port 111, and the other end penetrates the inner wall of the air charging ring part 11, and the inner wall of the air charging ring part 11 is provided with a gap between the shaft sleeve 41.
[0035] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 indicated, one side of the carbon ring 13 is provided with a gap 8, and the other side is provided with a gap between the air charging ring part 11 and the shaft sleeve 41. The gas introduced into the gas pressure seal 1 adopts nitrogen, the nitrogen flows to one side of the carbon ring 13 through the gas passage 112, and in the other direction of the nitrogen flow, the mechanical seal 2 seals the gas through the sealing ring between the inside and the shaft sleeve 41, so that the force of the nitrogen on the carbon ring 13 is ensured.
[0036] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 Figure 1 Figure 2 Figure 3 Figure 4 indicated, the gas passage 112 is a straight inclined structure. The inclined direction is towards the carbon ring 13, and when the nitrogen is introduced through the gas passage 112, the force on the carbon ring 13 can be better exerted.
[0037] The mechanical seal 2 includes a cold static ring seat 21 and a static ring 22, the cold static ring seat 21 is located at the outer ring of the mechanical seal 2 and is fixedly connected with the side surface of the air charging ring part 11 through bolts, the static ring 22 is located at the end of the mechanical seal 2 and is connected with the stepped platform of the inner wall of the air charging ring part 11 in cooperation, further including an anti-rotation pin 7, the carbon ring 13 is connected with the gasket ring 12 through the anti-rotation pin 7, and the lower stepped platform of the air charging ring part 11 is connected with the static ring 22 through the anti-rotation pin 7.
[0038] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, so: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A double-sealing structure for a fan, characterized in that, The utility model provides a kind of air pressure seal (1) and mechanical seal (2), which are both mounted on the shaft sleeve (41) of main shaft (4) and located between fan casing (3) and bearing seat (5), one end of the air pressure seal (1) is in contact with the fan casing (3), and the other end is fixedly connected with one end of the mechanical seal (2), and a gap (8) is provided between the end of the air pressure seal (1) close to the fan casing (3) and the shaft sleeve (41).
2. The double seal structure for a blower according to claim 1, wherein The air pressure seal (1) includes an inflation ring (11), a gasket ring (12), and a carbon ring (13). The gasket ring (12) is fitted on the shaft sleeve (41) and in contact with the fan casing (3). One end of the tooth end wall plate (6) is fixedly connected with the fan casing (3), and the other end is fixedly connected with the bearing seat (5). The gasket ring (12) has the same thickness as the side wall of the tooth end wall plate (6). The inflation ring (11) is mounted on the shaft sleeve (41) and fixedly connected with the gasket ring (12) and the tooth end wall plate (6). The carbon ring (13) is fitted on the shaft sleeve (41) and located between the gasket ring (12) and the inflation ring (11).
3. The double seal structure for a blower according to claim 2, wherein The inflation ring (11) includes an inflation port (111) and a gas channel (112). The inner wall of the inflation ring (11) has a stepped platform. The inner wall of the inflation ring (11) is connected with the mechanical seal (2), and the side part is fixedly connected with the mechanical seal (2). The inflation port (111) is opened at the top of the inflation ring (11). One end of the gas channel (112) is communicated with the inflation port (111), and the other end penetrates the inner wall of the inflation ring (11). There is a gap between the inner wall of the inflation ring (11) and the shaft sleeve (41).
4. The double seal structure for a blower according to claim 3, wherein One side of the carbon ring (13) is provided with the gap (8), and the other side is provided with the gap between the inflation ring (11) and the shaft sleeve (41).
5. The double seal structure for a blower according to claim 3, wherein The gas channel (112) is in inclined straight line structure.
6. The double seal structure for a blower according to claim 3, wherein The mechanical seal (2) includes a cold static ring seat (21) and a static ring (22). The cold static ring seat (21) is located outside the mechanical seal (2) and fixedly connected with the side of the inflation ring (11). The static ring (22) is located at the end of the mechanical seal (2) and connected with the stepped platform of the inner wall of the inflation ring (11). The cold static ring seat (21) is provided with a liquid seal inlet and outlet communicated with the mechanical seal (2).
7. The double seal structure for a blower according to claim 6, wherein It also includes an anti-rotation pin (7). The carbon ring (13) is connected with the gasket ring (12) through the anti-rotation pin (7). The lower stepped platform of the inflation ring (11) is connected with the static ring (22) through the anti-rotation pin (7).
8. The double seal structure for a blower according to claim 1, wherein The air pressure seal (1) is connected with external pressurized gas supply equipment.