Transmission shaft sealing structure

Abstract

The utility model discloses a transmission shaft sealing structure which comprises lip-shaped sealing rings, an interval exists between the two lip-shaped sealing rings, the lip-shaped sealing rings are symmetrically arranged relative to the interval, any lip-shaped sealing ring comprises a sealing soft material and a framework, the sealing soft material protrudes in the axial direction of a transmission shaft and gathers towards the axis of the transmission shaft, the framework supports the sealing soft material, and the periphery of the transmission shaft is sleeved with the sealing soft material; the outer wall of the transmission shaft is abutted; the flange is arranged on the peripheries of the two lip-shaped sealing rings in a sleeving mode and fixedly connected with the two frameworks, the flange covers the interval so that a sealing cavity can be formed in the interval, and an air channel communicated with the sealing cavity is formed in the flange; the protrusion, in the axial direction of the transmission shaft, of the sealing soft material is a protrusion in the direction away from the sealing cavity, and air introduced into the sealing cavity is used for pressing the sealing soft material to expand outwards so that the sealing soft material can be separated from the transmission shaft. The problem of abrasion caused by direct contact between the sealing ring and the rotating shaft can be solved, meanwhile, the influence of powder on the sealing ring can be eliminated, and cross contamination is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of shaft sealing, and in particular to a transmission shaft sealing structure. Background Art

[0002] The current conventional sealing method for drive shafts is to use ordinary V-shaped or O-shaped sealing rings for sealing. On the one hand, this sealing method usually requires regular maintenance and replacement due to contact wear between the seal and the drive shaft, resulting in waste of material and labor costs; on the other hand, in the field of food and pharmaceutical processing, most of the materials are processed in powder form, and the cleanliness requirements are high. If the maintenance is not timely, the material will accumulate between the drive shaft and the sealing ring, which will not be cleaned properly, and eventually lead to cross-contamination of food and medicine.

[0003] Therefore, in view of the above technical problems, how to avoid the wear of the sealing ring and effectively seal the powder material is a technical problem that technical personnel in this field need to solve. Utility Model Content

[0004] The purpose of the present application is to provide a transmission shaft sealing structure to solve the wear problem caused by direct contact between the sealing ring and the rotating shaft, while eliminating the influence of powder on the sealing ring and avoiding cross contamination.

[0005] To achieve the above object, the present application provides a transmission shaft sealing structure, which is arranged on the transmission shaft and includes:

[0006] There are two lip-shaped sealing rings, and there is a gap between the two lip-shaped sealing rings, and they are symmetrically arranged about the gap. Each of the lip-shaped sealing rings includes a sealing soft material protruding along the axial direction of the transmission shaft and gathering toward the axis of the transmission shaft, and a skeleton supporting the sealing soft material. The sealing soft material is sleeved on the outer periphery of the transmission shaft and abuts against the outer wall of the transmission shaft.

[0007] A flange is sleeved on the outer circumference of the two lip-shaped sealing rings and fixedly connected to the two frames, the flange covers the interval to form a sealed chamber at the interval, and an air passage communicating with the sealed chamber is opened on the flange;

[0008] The protrusion of the sealing soft material along the axial direction of the transmission shaft is a protrusion facing away from the sealing chamber, and the air introduced into the sealing chamber is used to press the sealing soft material to expand outward, so as to separate the sealing soft material from the transmission shaft.

[0009] Preferably, the pressure in the sealing chamber is greater than the pressure outside the lip seal ring.

[0010] Preferably, the pressure of the sealed chamber is maintained between 0.5-1 bar.

[0011] Preferably, the skeleton is sealingly connected to the flange along its circumference.

[0012] Preferably, after the sealing soft material is separated from the transmission shaft, the air in the sealing chamber overflows along the outer circumference of the transmission shaft to the outside of the lip seal ring.

[0013] Preferably, the air channel is externally connected to a compressed air device, and an O-ring sealedly connected to the compressed air device is arranged on the periphery of the air channel.

[0014] Preferably, the compressed air device comprises:

[0015] A filtration system, used to provide an air source and filter the air;

[0016] A pressure regulating system receives filtered air discharged from the filtering system and is used to regulate the output pressure of the air;

[0017] The pressure detection system receives filtered air from the pressure regulating system and is connected to the air passage to detect the pressure in the sealed chamber.

[0018] Preferably, the compressed air device further comprises an alarm system connected to the pressure detection system, for receiving a feedback signal from the pressure detection system and issuing an alarm signal when the pressure is abnormal.

[0019] Compared with the above-mentioned background technology, the present application utilizes the interval between two lip-shaped sealing rings to form a sealed chamber. When clean air is introduced into the sealed chamber, since the bulge of the sealing soft material along the axial direction of the transmission shaft is a bulge in the direction away from the sealed chamber, after the air pressure in the sealed chamber reaches a certain value, the sealing soft material will be pressed to expand outward, thereby separating the sealing soft material from the transmission shaft. Since the sealing soft material is not in direct contact with the transmission shaft, the service life of the sealing soft material is greatly improved; at the same time, after the sealing soft material expands outward, due to the characteristics of the lip structure of the lip-shaped sealing ring, only a small amount of air overflows through the gap between the lip-shaped sealing ring and the transmission shaft, but there will be no large-scale leakage, and the material in the production area on one side of the lip-shaped sealing ring will not enter between the sealing ring and the transmission shaft, and the potential pollutants in the transmission area on the other side will not enter the production area through the sealing ring, thereby realizing effective sealing of the transmission shaft.

[0020] Specifically, the structure is arranged on the transmission shaft, and includes a lip-shaped sealing ring and a flange. There are two lip-shaped sealing rings, and there is a gap between the two lip-shaped sealing rings, and they are symmetrically arranged about the gap. Any lip-shaped sealing ring includes a sealing soft material that protrudes along the axial direction of the transmission shaft and gathers toward the axis of the transmission shaft, and a skeleton supporting the sealing soft material. The sealing soft material is sleeved on the outer periphery of the transmission shaft and abuts against the outer wall of the transmission shaft; the flange is sleeved on the outer periphery of the two lip-shaped sealing rings and fixedly connected to the two skeletons. The flange covers the gap to form a sealed chamber at the gap, and an air channel connected to the sealed chamber is opened on the flange.

[0021] It should be noted that the protrusion of the sealing soft material along the axial direction of the transmission shaft is a protrusion in the direction away from the sealing chamber, so that the compressed air in the sealing chamber can squeeze the sealing soft material to a certain extent, and because the sealing soft material gathers toward the center, there is a certain inclined wall surface, which presses the sealing soft material to expand outward under the action of compressed air, so that the sealing soft material is separated from the transmission shaft without changing its position, avoiding wear of the sealing ring and achieving effective sealing of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a transmission shaft sealing structure provided in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the structure of a compressed air device provided in an embodiment of the present application.

[0025] In the figure: 1, transmission shaft 2, lip seal 3, sealing chamber 4, flange 5, air channel 6, filtering system 7, pressure regulating system 8, pressure detection system. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figure 1 As shown, in this embodiment, a transmission shaft sealing structure is provided, which is arranged on the transmission shaft 1, so that the transmission shaft 1 has an efficient sealing state. Specifically, the structure includes a lip seal ring 2 and a flange 4, the number of the lip seal rings 2 is two, there is a certain interval between the two lip seal rings 2, and the two lip seal rings 2 are symmetrically arranged about the interval.

[0030] It should be noted that any lip seal 2 includes a soft sealing material that protrudes along the axial direction of the transmission shaft 1 and gathers toward the axis of the transmission shaft 1, and a skeleton that supports the soft sealing material. Generally speaking, the lip seal 2 itself has a soft sealing material that fits the transmission shaft 1, and the skeleton is used to maintain a certain supporting effect on the soft sealing material. In addition, the soft sealing material has a certain elastic effect. When the soft sealing material is sleeved on the outer periphery of the transmission shaft 1, the soft sealing material abuts against the outer wall of the transmission shaft 1 without the influence of other external forces, thereby forming a certain sealing effect.

[0031] The flange 4 is sleeved on the outer circumference of the two lip-shaped sealing rings 2 and fixedly connected to the two frames to provide a fixing point for the two lip-shaped sealing rings 2; at the same time, the flange 4 also covers the gap between the two lip-shaped sealing rings 2, so that under the sealing action of the flange 4, a sealed chamber 3 is formed in the gap, and an air channel 5 connected to the sealed chamber 3 is opened on the flange 4, and compressed air is provided to the sealed chamber 3 through the air channel 5.

[0032] It should be pointed out that the protrusion of the sealing soft material along the axial direction of the transmission shaft 1 is a protrusion in the direction away from the sealing chamber 3. When compressed air is introduced into the sealing chamber 3, the compressed air in the sealing chamber 3 has a relatively high pressure. Therefore, under the support of the inclined surface of the inner wall of the sealing soft material, the pressure of the compressed air will act on the inclined surface, thereby pressing the sealing soft material to expand outward, thereby separating the sealing soft material from the transmission shaft 1.

[0033] And after the sealing soft material is separated from the transmission shaft 1, the compressed air in the sealing chamber 3 will overflow through the gap between the transmission shaft 1 and the sealing soft material, thereby preventing powder from entering the sealing ring and causing cross contamination.

[0034] In summary of the above embodiments, the present application utilizes the interval between the two lip-shaped sealing rings 2 to form a sealed chamber 3. When clean air is introduced into the sealed chamber 3, since the bulge of the sealing soft material along the axial direction of the transmission shaft 1 is a bulge in the direction away from the sealed chamber 3, after the air pressure in the sealed chamber 3 reaches a certain value, the sealing soft material will be pressed to expand outward, thereby separating the sealing soft material from the transmission shaft 1. Since the sealing soft material is not in direct contact with the transmission shaft 1, the service life of the sealing soft material is greatly improved; at the same time, after the sealing soft material expands outward, due to the characteristics of the lip structure of the lip-shaped sealing ring 2, only a small amount of air overflows through the gap between the lip-shaped sealing ring 2 and the transmission shaft 1, but there will be no large-scale leakage, and the materials in the production area on one side of the lip-shaped sealing ring 2 will not enter between the sealing ring and the transmission shaft 1, and the potential pollutants in the transmission area on the other side will not enter the production area through the sealing ring, thereby achieving effective sealing of the transmission shaft 1.

[0035] On this basis, it can be known that, as compressed air is introduced into the sealing chamber 3 and as time goes by, the pressure in the sealing chamber 3 will inevitably be greater than the pressure outside the lip seal 2, preventing powder from entering the seal.

[0036] In this embodiment, the pressure of the sealing chamber 3 is maintained between 0.5 and 1 bar, which is suitable for the sealing pressure of most transmission shafts 1 to prevent powder from entering the sealing ring. Of course, the pressure parameters given above, including but not limited to this value, can be selected according to actual conditions, and no further restrictions are made here.

[0037] It should be noted that in order to maintain the sealing type of the sealing cavity, the frames of the two lip seals 2 need to be sealed with the flange 4. And combined with the existing lip seals 2, it can be seen that when the frame is sealed with the flange 4, the soft material on the periphery of the frame will inevitably be squeezed, so that a sealed connection is naturally formed through the squeezing effect, which will not be described in detail here.

[0038] Since the sealing soft material needs to be separated from the transmission shaft 1 under the pressure of compressed air, under the premise of ensuring that the sealing soft material and the transmission shaft 1 are coaxially assembled, the pressure generated by the compressed air in the sealing chamber 3 will act evenly on the inner wall of the sealing soft material, so that the sealing soft material can expand outward evenly, avoiding the situation where one side of the sealing soft material expands outward while the other side is still in contact with the transmission shaft 1, thereby ensuring that the compressed air overflows along the outer circumference of the transmission shaft 1 to the outside of the lip seal ring 2.

[0039] As can be seen from the above, compressed air is introduced into the air channel 5, so in this embodiment, a setting mode of connecting the air channel 5 to an external compressed air device is provided, and an O-ring sealedly connected to the compressed air device is provided on the periphery of the air channel 5. Specifically, the O-ring is provided on the flange 4 and is located on the periphery of the air channel 5.

[0040] Please refer to Figure 2 The compressed air device includes a filter system 6, a pressure regulating system 7 and a pressure detection system 8. The filter system 6 is used to provide an air source. The compressed air entering the sealed chamber 3 passes through the filter system 6 in advance to filter out impurities in the air and pass clean compressed air. The pressure regulating system 7 receives the filtered air discharged by the filter system 6 and is used to adjust the output pressure of the air. The pressure regulating system 7 cooperates with the pressure detection system 8 to detect the pressure in the sealed chamber 3 through the pressure detection system 8, and then adjusts the output air pressure through the pressure regulating system 7.

[0041] When the lip seal 2 is damaged and causes pressure fluctuations in the sealing chamber 3, the pressure detection device will detect a signal. At this time, the alarm system connected to the pressure detection system 8 will send out an alarm signal when the pressure is abnormal, reminding the staff to inspect the sealing device.

[0042] In general, the present application solves the wear problem caused by direct contact between the static sealing device and the rotating shaft. At the same time, the structure will not leak a large amount of air, and there is no need to worry about the impact on the dust production environment, meeting the Class D clean area production standards; and combined with a compressed air device that realizes real-time monitoring, the effectiveness and efficiency of the sealing device are guaranteed.

[0043] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0044] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A transmission shaft sealing structure, arranged on a transmission shaft, characterized in that: include: There are two lip-shaped sealing rings, and there is a gap between the two lip-shaped sealing rings, and they are symmetrically arranged about the gap. Each of the lip-shaped sealing rings includes a sealing soft material protruding along the axial direction of the transmission shaft and gathering toward the axis of the transmission shaft, and a skeleton supporting the sealing soft material. The sealing soft material is sleeved on the outer periphery of the transmission shaft and abuts against the outer wall of the transmission shaft. A flange is sleeved on the outer circumference of the two lip-shaped sealing rings and fixedly connected to the two frames, the flange covers the interval to form a sealed chamber at the interval, and an air passage communicating with the sealed chamber is opened on the flange; The protrusion of the sealing soft material along the axial direction of the transmission shaft is a protrusion facing away from the sealing chamber, and the air introduced into the sealing chamber is used to press the sealing soft material to expand outward, so as to separate the sealing soft material from the transmission shaft.

2. The transmission shaft sealing structure according to claim 1, characterized in that: The pressure in the sealing chamber is greater than the pressure outside the lip seal ring.

3. The transmission shaft sealing structure according to claim 2, characterized in that: The pressure of the sealed chamber is maintained between 0.5-1 bar.

4. The transmission shaft sealing structure according to claim 3, characterized in that: The frame is sealed and connected to the flange along its circumference.

5. The transmission shaft sealing structure according to claim 1, characterized in that: After the sealing soft material is separated from the transmission shaft, the air in the sealing chamber overflows along the outer circumference of the transmission shaft to the outside of the lip seal ring.

6. The transmission shaft sealing structure according to any one of claims 1 to 5, characterized in that: The air channel is externally connected to a compressed air device, and an O-ring sealed and connected to the compressed air device is arranged on the periphery of the air channel.

7. A sealing system, characterized in that: include: The sealing structure is the transmission shaft sealing structure according to any one of claims 1 to 6; A filtration system, used to provide an air source and filter the air; A pressure regulating system, receiving the filtered air discharged from the filtering system and used for regulating the output pressure of the air; The pressure detection system receives filtered air from the pressure regulating system and is connected to the air channel on the sealing structure to detect the pressure in the sealed chamber of the sealing structure.

8. The sealing system according to claim 7, characterized in that It also includes an alarm system connected to the pressure detection system, which is used to receive a feedback signal from the pressure detection system and send out an alarm signal when the pressure is abnormal.

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