Shaft end isolation device for inhibiting external impurities from entering equipment body

Abstract

A shaft end isolation device for inhibiting external impurities from entering an equipment body comprises a connecting base, a main shaft, a blocking mechanism and a gland, and the blocking mechanism comprises an inner blocking ring and an outer blocking ring; the inner blocking ring is arranged in the connecting seat and sleeved on the main shaft in an interference mode, the outer ring wall of the inner blocking ring is not contacted with the inner wall of the connecting seat, the inner blocking ring is provided with a plurality of inner annular protrusions which are concentric at equal intervals, an inner annular groove is formed between every two adjacent inner annular protrusions, and the outer blocking ring is arranged in the connecting seat in an interference mode. The outer blocking ring is provided with a plurality of concentric outer annular protrusions at equal intervals, an outer annular groove is formed between every two adjacent outer annular protrusions, the inner annular protrusions can be correspondingly inserted into the outer annular grooves, the outer annular protrusions can be correspondingly inserted into the inner annular grooves, the outer blocking ring is static, and the inner blocking ring rotates along with the main shaft. And a centrifugal effect is formed between the inner blocking ring and the outer blocking ring, so that external impurities are prevented from entering the machine body in the axial direction, and the impurities are effectively prevented from entering the machine body in a relatively severe place to cause abrasion.

Description

Technical Field

[0001] The present invention relates to the field of mechanical technology, and particularly to a shaft-end isolation device for inhibiting external impurities from entering the equipment body. Background Art

[0002] At present, the shaft-end sealing systems of industrial equipment generally adopt contact-type oil seal structures (such as lip seals), and their sealing principle relies on the interference fit between the sealing lip and the shaft diameter surface to form a dynamic contact interface. However, in the long-term operation process, this solution has significant technical defects: 1. The interface wear is irreversible The continuous friction between the sealing lip and the rotating shaft surface causes fretting wear, which not only causes the elastic failure of the sealing lip, but also forms an annular wear groove with a depth of 0.1 - 0.5 mm at the journal part. Such mechanical damage will destroy the structural integrity of the shaft body, leading to stress concentration and dynamic balance offset problems.

[0003] 2. Harsh working conditions accelerate failure In an operating environment containing solid particles (such as pulp, sludge) or corrosive media (acid / alkaline solutions), the combined action of abrasive wear and chemical corrosion increases the wear rate of the sealing interface by 3 - 5 times, resulting in the sealing failure cycle being shortened to 30% - 50% of that under normal working conditions.

[0004] 3. Poor maintenance economy During maintenance, the oil seal assembly can be conveniently replaced, but the journal surface in cooperation with it is prone to form wear grooves due to continuous friction. Conventional means cannot achieve in-situ repair, and the main shaft assembly worth tens of thousands to hundreds of thousands of yuan needs to be replaced as a whole. Frequent shutdown maintenance not only increases the operation and maintenance costs, but also significantly reduces the overall equipment utilization rate, seriously affecting the continuous production efficiency. Summary of the Invention

[0005] In order to solve the technical problems existing in the above technologies, in view of this, it is necessary to provide a shaft-end isolation device for inhibiting external impurities from entering the equipment body.

[0006] A shaft-end isolation device for inhibiting external impurities from entering the equipment body includes: A connecting seat, which is arranged on the body, the inside of the connecting seat is hollow and the end away from the body is open; A main shaft, which is inserted into the body along the axis of the connecting seat, and a bearing located in the connecting seat is sleeved on the main shaft; Blocking mechanism, the blocking mechanism includes an inner blocking ring and an outer blocking ring; the inner blocking ring is built into the connecting seat and is press-fitted on the main shaft. The outer wall of the outer circle of the inner blocking ring does not contact the inner wall of the connecting seat. The inner blocking ring has a plurality of equally spaced concentric inner annular protrusions, and inner annular grooves are formed between adjacent inner annular protrusions. The outer blocking ring is press-fitted into the connecting seat. The outer blocking ring has a plurality of equally spaced concentric outer annular protrusions, and outer annular grooves are formed between adjacent outer annular protrusions. The inner annular protrusions can be correspondingly inserted into the outer annular grooves, and the outer annular protrusions can be correspondingly inserted into the inner annular grooves. The outer blocking ring remains stationary, and the inner blocking ring rotates with the main shaft, so that a centrifugal effect is formed between the inner blocking ring and the outer blocking ring to prevent external impurities from entering the body along the axis; A gland, the gland is installed at the open end of the connecting seat to press the outer blocking ring.

[0007] Preferably, a drain port is provided in the radial direction at one end of the connecting seat close to the outer blocking ring.

[0008] Preferably, a gap is left between the end of the inner annular protrusion and the bottom of the outer annular groove, and between the outer annular protrusion and the bottom of the inner annular groove to form a buffer cavity.

[0009] Preferably, a gap is left between the inner annular protrusion and the outer annular groove, and between the outer annular protrusion and the inner annular groove.

[0010] Preferably, a blocking strip that does not contact the outer annular protrusion is provided on the outer wall of the inner annular protrusion.

[0011] Preferably, the blocking strip is spiral and is evenly distributed along the circumferential direction of the inner annular protrusion.

[0012] Preferably, an annular blocking plate is provided at the end of the inner annular protrusion. The outer diameter of the blocking plate is larger than the outer diameter of the inner annular protrusion, and the outer wall of the outer circle of the blocking plate does not contact the outer annular protrusion.

[0013] Preferably, a sealing strip is provided between the gland and the outer blocking ring.

[0014] Preferably, retaining rings sleeved on the main shaft are provided on both sides of the bearing.

[0015] Compared with the prior art, the shaft-end isolation device provided by the present invention for suppressing external impurities from entering the machine body of the device includes a connecting seat, a main shaft, a blocking mechanism, and a gland. The connecting seat is arranged on the machine body. The inside of the connecting seat is hollow and open at one end away from the machine body. The gland is installed at the open end of the connecting seat. The main shaft is inserted into the machine body along the axis of the connecting seat, and a bearing located in the connecting seat is sleeved on the main shaft. The blocking mechanism includes an inner blocking ring and an outer blocking ring. The inner blocking ring is placed inside the connecting seat and is press-fitted on the main shaft. The outer wall of the outer circle of the inner blocking ring does not contact the inner wall of the connecting seat. The inner blocking ring has a plurality of equally spaced concentric inner annular protrusions, and inner annular grooves are formed between adjacent inner annular protrusions. The outer blocking ring is press-fitted inside the connecting seat. The outer blocking ring has a plurality of equally spaced concentric outer annular protrusions, and outer annular grooves are formed between adjacent outer annular protrusions. The inner annular protrusions can be correspondingly inserted into the outer annular grooves, and the outer annular protrusions can be correspondingly inserted into the inner annular grooves. The outer blocking ring remains stationary, and the inner blocking ring rotates with the main shaft, so that a centrifugal effect is formed between the inner blocking ring and the outer blocking ring to prevent external impurities from entering the machine body axially, thereby effectively preventing impurities from entering the machine body in relatively harsh places and causing wear. Thus, the frequency of shutdown maintenance and repair is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the blocking mechanism of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the inner blocking ring of the present invention.

[0020] Figure 4 For the present invention Figure 3 Cross-sectional structural diagram.

[0021] Figure 5 It is a schematic structural diagram of the outer blocking ring of the present invention.

[0022] Figure 6 For the present invention Figure 5 Cross-sectional structural diagram.

[0023] In the figure: connecting seat 01, main shaft 02, blocking mechanism 03, inner blocking ring 31, inner annular protrusion 311, inner annular groove 312, outer blocking ring 32, outer annular protrusion 321, outer annular groove 322, gland 04, drain port 05, buffer cavity 06, blocking strip 07, blocking plate 08, bearing 09, retaining ring 10. Detailed implementation mode

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0026] Please refer to Figures 1 to 6 , the present invention provides a shaft end isolation device for suppressing external impurities from entering the equipment body, including a connecting seat 01, a main shaft 02, a blocking mechanism 03, and a gland 04. Among them, the connecting seat 01 is arranged on the body, the inside of the connecting seat 01 is hollow and the end away from the body is open.

[0027] Among them, the main shaft 02 is inserted into the body along the axis of the connecting seat 01, and a bearing 09 located in the connecting seat 01 is sleeved on the main shaft 02 to ensure the normal rotation of the main shaft 02. Retaining rings 10 sleeved on the main shaft 02 are arranged on both sides of the bearing 09 to position the bearing 09.

[0028] Among them, the blocking mechanism 03 includes an inner blocking ring 31 and an outer blocking ring 32; the inner blocking ring 31 is built into the connecting seat 01, and the inner blocking ring 31 is press-fitted and sleeved on the main shaft 02, and the outer peripheral wall of the inner blocking ring 31 does not contact the inner wall of the connecting seat 01. The inner blocking ring 31 has a plurality of equally spaced concentric inner annular protrusions 311, and inner annular grooves 312 are formed between adjacent inner annular protrusions 311. The outer blocking ring 32 is press-fitted and built into the connecting seat 01. The outer blocking ring 32 has a plurality of equally spaced concentric outer annular protrusions 321, and outer annular grooves 322 are formed between adjacent outer annular protrusions 321. The inner annular protrusions 311 can be correspondingly inserted into the outer annular grooves 322, and the outer annular protrusions 321 can be correspondingly inserted into the inner annular grooves 312. The outer blocking ring 32 remains stationary, and the inner blocking ring 31 rotates with the main shaft 02, so that a centrifugal effect is formed between the inner blocking ring 31 and the outer blocking ring 32 to prevent external impurities from entering the machine body axially; thus effectively preventing impurities from entering the machine body in relatively harsh places and causing wear.

[0029] Among them, the gland 04 is installed at the open end of the connecting seat 01 to press the outer blocking ring 32. For the installation of the gland 04, a bolt fastening method can be used. To ensure a better sealing effect, a sealing strip is provided between the gland 04 and the outer blocking ring 32.

[0030] In one embodiment, a drain port 05 is radially opened at one end of the connecting seat 01 close to the outer blocking ring 32. When the outer blocking ring 32 remains stationary and the inner blocking ring 31 rotates with the main shaft 02, after a centrifugal effect is formed between the inner blocking ring 31 and the outer blocking ring 32, the entering liquid impurities can be discharged from the drain port 05 under the action of centrifugal force, preventing part of the liquid impurities entering the blocking mechanism 03 from staying for a long time.

[0031] In one embodiment, a gap is left between the end of the inner annular protrusion 311 and the bottom of the outer annular groove 322, and between the outer annular protrusion 321 and the bottom of the inner annular groove 312 to form a buffer cavity 06. When the inner blocking ring 31 rotates with the main shaft 02, a circumferential air flow disturbance can be formed in the buffer cavity 06 to prevent dust impurities from entering.

[0032] In one embodiment, a gap is left between the inner annular protrusion 311 and the outer annular groove 322, and between the outer annular protrusion and the inner annular groove 312 to reduce the relative friction formed between the inner annular protrusion 311 and the outer annular protrusion 321.

[0033] Specifically, a barrier strip 07 that does not contact the outer annular protrusion 321 is provided on the outer wall of the inner annular protrusion 311. Among them, the barrier strip 07 is spiral and evenly distributed along the circumferential direction of the inner annular protrusion 311. When the main shaft 02 rotates at a high speed, the barrier strip 07 also rotates at a high speed following the inner barrier ring 31. When the barrier strip 07 rotates at a high speed, it will make the gap between the inner annular protrusion 311 and the outer annular protrusion 321 smaller, so that the air between the inner annular protrusion 311 and the outer annular protrusion 321 forms a stable high-pressure air film under the action of the high-speed rotating inner annular protrusion 311 and the barrier strip 07, thereby blocking liquid and dust impurities and effectively preventing liquid and dust impurities from entering.

[0034] Among them, for the barrier strip 07, a rubber strip material can be selected. During installation, an embedded installation method can be adopted. For example, a spiral groove is opened on the outer wall of the inner annular protrusion 311, and the barrier strip 07 can be embedded into the spiral groove. By adopting the above method, it is easier to disassemble and replace the barrier strip 07 after it is damaged.

[0035] More specifically, an annular baffle 08 is provided at the end of the inner annular protrusion 311. The outer diameter of the baffle 08 is larger than the outer diameter of the inner annular protrusion 311, and the outer circumferential wall of the baffle 08 does not contact the outer annular protrusion 321. The baffle 08 can be fixed to the end of the inner annular protrusion 311 by screws or bolts. The baffle 08 can reduce the gap between the end of the inner annular protrusion 311 and the outer annular protrusion 321. On the one hand, it can block impurities, and on the other hand, it can make it easier to form an air film between the inner annular protrusion 311 and the outer annular protrusion 321.

[0036] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An axial end isolation device for preventing external impurities from entering the equipment body, characterized in that: Including, a connecting seat, which is arranged on the machine body, the inside of the connecting seat is hollow and the end away from the machine body is open; a main shaft, which is inserted into the machine body along the axis of the connecting seat, and a bearing located in the connecting seat is sleeved on the main shaft; a barrier mechanism, which includes an inner barrier ring and an outer barrier ring; the inner barrier ring is placed inside the connecting seat and is interference-fitted on the main shaft, the outer wall of the inner barrier ring does not contact the inner wall of the connecting seat, there are a plurality of equally spaced concentric inner annular protrusions on the inner barrier ring, an inner annular groove is formed between adjacent inner annular protrusions, the outer barrier ring is interference-fitted inside the connecting seat, there are a plurality of equally spaced concentric outer annular protrusions on the outer barrier ring, an outer annular groove is formed between adjacent outer annular protrusions, the inner annular protrusions can be correspondingly inserted into the outer annular grooves, and the outer annular protrusions can be correspondingly inserted into the inner annular grooves. The outer barrier ring is stationary, and the inner barrier ring rotates with the main shaft, so that a centrifugal effect is formed between the inner barrier ring and the outer barrier ring to prevent external impurities from entering the machine body axially; a gland, which is installed at the open end of the connecting seat to press the outer barrier ring.

2. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 1, wherein: One end of the connecting seat close to the outer barrier ring is provided with a drain port in the radial direction.

3. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 1 or 2, characterized in that: A gap is left between the end of the inner annular protrusion and the bottom of the outer annular groove, and between the outer annular protrusion and the bottom of the inner annular groove to form a buffer cavity.

4. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 3, characterized in that: A gap is left between the inner annular protrusion and the outer annular groove, and between the outer annular protrusion and the inner annular groove.

5. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 4, characterized in that: A barrier strip that does not contact the outer annular protrusion is arranged on the outer wall of the inner annular protrusion.

6. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 5, wherein: The barrier strip is spiral and evenly distributed along the circumferential direction of the inner annular protrusion.

7. The shaft end isolation device for preventing external impurities from entering the equipment body according to claim 6, characterized in that: An annular barrier plate is arranged at the end of the inner annular protrusion, the outer diameter of the barrier plate is larger than the outer diameter of the inner annular protrusion, and the outer wall of the barrier plate does not contact the outer annular protrusion.

8. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 1, characterized in that: A sealing strip is arranged between the gland and the outer barrier ring.

9. The shaft end isolation device for suppressing external impurities from entering the equipment body according to claim 1, characterized in that: Retaining rings sleeved on the main shaft are arranged on both sides of the bearing.

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