Three-form bidirectional sealing structure

Abstract

The application discloses a three-form bidirectional sealing structure, relates to the technical field of sealing, and solves the problems that in the prior art, the two sides of sealing are different media, the two sides of media are prohibited from being mixed, if the media are connected in series, the product performance is affected, under high-temperature weather conditions, there is thermal expansion phenomenon, under rain and snow weather conditions, external liquid flows into the product, and under bad environment, wind sand and dust invade, which can cause adverse effects on the product, and the specific scheme is as follows: a three-form bidirectional sealing structure, comprising a shaft and an end cover, the end cover is arranged on the circumferential side of the shaft, a sealing ring is arranged between the end cover and the shaft, a felt is arranged between the end cover and the sealing ring, the sealing ring body extends in the axial direction to form a medium sealing ring on the two side surfaces of the end cover, a plurality of protrusions are arranged on the medium sealing ring, a plurality of recesses are arranged in parallel at the positions corresponding to the protrusions of the end cover, and the recesses and the protrusions are in clearance fit to form a labyrinth seal and a non-contact clearance seal.

Description

TECHNICAL FIELD

[0001] The present application relates to the sealing technical field, especially to a three-form bidirectional sealing structure. BACKGROUND

[0002] In the production process, the sealing sides of many mechanical devices are different media, and the two sides of the medium are prohibited from being mixed. If the media are connected to each other, the product performance will be affected, the product life will be reduced, the product operation reliability will be reduced, the product quality will be seriously affected, and great safety hazards will be brought to the production operation. There are also many devices that need to be operated in harsh conditions such as high temperature, high humidity, dust, and open air for a long time. There are thermal expansion phenomena in high-temperature weather conditions, external liquid flow into the product caused by adverse weather conditions such as rain and snow, and wind and dust invasion in adverse environments, which can all cause adverse effects on the product. In the existing sealing mode, the sealing ring sealing is a contact sealing, which has contact wear, affecting the service life of the sealing ring. The sealing capacity of the labyrinth seal is reduced at low speed, and the sealing effect is poor, which cannot solve the above problems. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the present application is to provide a three-form bidirectional sealing structure, which is combined by setting a labyrinth seal, a non-contact gap seal, and a felt seal, and has a high, medium, and low sealing capacity. It is suitable for a wide range of speed change conditions and can meet the bidirectional sealing requirements in harsh conditions such as high temperature, high humidity, dust, and open air, and has a large popularization space.

[0004] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0005] A three-form bidirectional sealing structure, comprising a shaft and an end cover, the end cover is arranged on the side of the shaft, a sealing ring is arranged between the end cover and the shaft, a felt is arranged between the end cover and the sealing ring, the sealing ring body extends in the axial direction to form a medium sealing ring on both sides of the end cover, a plurality of protrusions are arranged on the medium sealing ring, a plurality of grooves are arranged in parallel at the positions corresponding to the protrusions of the end cover, and the gap between the grooves and the protrusions forms a labyrinth seal and a non-contact gap seal.

[0006] As a further implementation manner, the sealing ring body extends in the axial direction to form a first medium sealing ring and a second medium sealing ring, and the first medium sealing ring and the second medium sealing ring are located on both sides of the end cover.

[0007] As a further implementation manner, the outer diameter of the first medium sealing ring is smaller than the outer diameter of the second medium sealing ring.

[0008] As a further implementation manner, the protrusions are annular protrusions, and the grooves are annular grooves.

[0009] As a further implementation, the depth of the groove is greater than the length of the protrusion, and the width of the groove is greater than the width of the protrusion.

[0010] As a further implementation, the protrusion is arranged close to the outer side of the groove.

[0011] As a further implementation, a plurality of protrusions are arranged on the first medium sealing ring, and at least one protrusion is arranged on the second medium sealing ring.

[0012] As a further implementation, the cross section of the protrusion is rectangular.

[0013] As a further implementation, an oil return hole is arranged on the end cover.

[0014] As a further implementation, the oil return hole is arranged on the side of the end cover close to the first medium sealing ring, one end of the oil return hole penetrates through the end cover, and the other end communicates with the groove on the inner side of the end cover.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The gap between the groove and the protrusion forms a labyrinth seal and a non-contact gap seal, the end cover and the sealing ring are arranged with a felt to form a felt seal, including three sealing forms, the labyrinth seal can be sealed by the centrifugal force of the medium when the shaft rotates at high speed. When the shaft speed is reduced to medium and low speed, the non-contact gap seal can be used to seal by the tension of the oil film at medium and low speed, improving the sealing capacity at medium and low speed of the shaft; In this process, the felt seal is used to absorb and isolate liquid particles and solid dust, greatly improving the sealing effect.

[0017] 2. The first medium sealing ring and the second medium sealing ring are located on both sides of the end cover to form a double-sided labyrinth seal, and there is no contact and no wear, the bidirectional sealing capacity is strong, the structure is simple, and the performance is reliable; It can meet the bidirectional sealing requirements in harsh working conditions such as high temperature, high humidity, dust, and open air, and has a large popularization space.

[0018] 3. The labyrinth seal and the non-contact gap seal of the present application are both non-contact sealing methods, and there is a gap between the sealing members, no wear occurs, and the service life of the seal is improved.

[0019] 4. The combined action of the labyrinth seal, the non-contact gap seal, and the felt seal of the present application strengthens the sealing capacity at high, medium, and low speed, and is suitable for a wide range of speed change working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation of the present application.

[0021] Figure 1 is a schematic view of a three-form bidirectional sealing structure in an embodiment of the present application.

[0022] In the figure, the mutual spacing or size is exaggerated for showing the position of each part, and the schematic view is only illustrative.

[0023] In the figure, the mutual spacing or size is exaggerated for showing the position of each part, and the schematic view is only illustrative. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0025] Embodiment One

[0026] In a typical embodiment of the present application, referring to Figure 1 , a three-form bidirectional sealing structure includes a shaft 5 and an end cover 2, the end cover 2 is arranged on the side of the shaft 5 and coaxially arranged with the shaft 5, a sealing ring 1 is arranged between the end cover 2 and the shaft 5 for sealing, and a felt 7 is arranged between the end cover 2 and the sealing ring 1 to form a felt seal 10. The felt 7 is used to absorb and isolate liquid small particles and solid dust.

[0027] The sealing ring body extends in the axial direction to form a medium sealing ring on both sides of the end cover 2, specifically, the sealing ring body extends in the axial direction to form a first medium sealing ring 3 and a second medium sealing ring 4, and the first medium sealing ring 3 and the second medium sealing ring 4 are located on both sides of the end cover 2, wherein the outer diameter of the first medium sealing ring 3 is smaller than the outer diameter of the second medium sealing ring 4.

[0028] A plurality of protrusions are arranged on the first medium sealing ring 3 and the second medium sealing ring 4, and a plurality of grooves are arranged in parallel at the positions corresponding to the protrusions of the end cover 2, and the number of the grooves is the same as that of the protrusions and the grooves are arranged correspondingly.

[0029] The depth of the groove is greater than the length of the protrusion, and the width of the groove is greater than the width of the protrusion, so that the groove and the protrusion are in a clearance fit, the protrusion is a ring-shaped protrusion, and the groove is a ring-shaped groove. In this embodiment, the plurality of protrusions and the grooves are matched to form a labyrinth seal 8, and further, the groove and the protrusion are in a clearance fit to form a non-contact clearance seal 9.

[0030] Considering the centrifugal force when the shaft 5 rotates, the protrusions of this embodiment are arranged in close contact with the outer side surface of the groove. In this embodiment, three protrusions are arranged on the first medium sealing ring 3, and one protrusion is arranged on the second medium sealing ring 4, and the cross section of the protrusion is rectangular.

[0031] The protrusions and grooves cooperate to form a labyrinth seal 8. The first and second dielectric sealing rings 3 and 4 are located on either side of the end cap 2, forming a bilateral labyrinth seal. A felt seal 10 is located between the two labyrinth seals. Labyrinth seal 8 primarily utilizes the centrifugal force of the medium generated by the rotation of the sealing rings 1. The non-contact gap seal 9 utilizes the tension of the oil film for sealing.

[0032] During high-speed rotation, the labyrinth seal 8 is the main sealing method. During medium and low-speed rotation, the labyrinth seal 8 and the non-contact gap seal 9 seal together, and the oil mist, water mist, microparticles, etc. are sealed by the felt 7.

[0033] Furthermore, an oil return hole 6 is provided on the end cap 2. This hole is located on the side of the end cap near the first medium sealing ring 3. One end of the hole 6 extends through the end cap 2, while the other end communicates with a groove on the inner side of the end cap 2, i.e., the inner hole of the end cap. This hole allows the medium to flow back, preventing the accumulation of pressure that could affect the sealing effect.

[0034] When the shaft 5 rotates at high speed, the first medium sealing ring 3 rotates at high speed, and the medium flows radially toward the outer edge of the first medium sealing ring 3 under the action of centrifugal force, forming high pressure in the circumferential direction, preventing the oil from flowing toward the center of the circle and leaking, thereby achieving a good sealing effect. Similarly, the second medium sealing ring 4 and the end cover 2 form a labyrinth seal to prevent the medium from being connected in series.

[0035] When the shaft 5 runs at medium and low speeds, the sealing ability of the bilateral labyrinth seal is weakened, and part of the medium flowing out after being sealed by the labyrinth seal is sealed by the non-contact gap seal 9. There is a gap between the sealing ring 1 protrusion of the non-contact gap seal 9 and the inner hole (groove) of the end cover. When the medium passes through, a medium film is formed. The medium film adheres to the gap between the oil sealing ring and the end cover, forming tension. The film tension forms sealing resistance. At the same time, the non-contact gap sealing part is also connected to the oil return hole 6 through the inner groove. The escaping medium flows back through the oil return hole 6 to avoid the accumulation of medium to form pressure that affects the sealing effect.

[0036] In addition, a felt seal 10 is included, and a felt 7 is filled between the sealing ring and the inner hole of the end cover to prevent oil mist, water mist, microparticles, etc. from being connected in series. Therefore, a triple-layered multi-sealing structure is formed between the shaft and the end cover in this embodiment, greatly enhancing the sealing effect.

[0037] Bidirectional sealing, no contact, no wear, strong bidirectional sealing ability, simple structure, reliable performance. After years of application verification, it can meet the bidirectional sealing requirements under harsh working conditions such as high temperature, high humidity, dust, and open air, and has a large space for promotion.

[0038] Compared with the sealing ring seal of the sealing structure of this embodiment: the sealing ring seal is a contact seal, and there is contact wear, which affects the life of the sealing ring; the labyrinth seal 8 and the non-contact gap seal 9 of this embodiment are both contactless sealing methods, there is a gap between the seals, no wear occurs, and the service life of the seal is improved.

[0039] Compared with a single labyrinth seal: the labyrinth seal is a single-sided seal, while the labyrinth seal of this embodiment is a double-sided seal, which further enhances the sealing effect; the labyrinth seal has a weak sealing effect at medium and low speeds, and this embodiment adds a non-contact gap seal 9 on the basis of the labyrinth seal. When the shaft 5 rotates at medium and low speeds, the effect of the labyrinth seal 8 is weakened, thereby improving the sealing ability at medium and low speeds.

[0040] Compared with the single non-contact gap seal 9, this embodiment adds a labyrinth seal 8 and a felt seal 10, enhances the sealing ability at high, medium and low speeds, can meet the two-way sealing requirements under harsh working conditions such as high temperature, high humidity, dust, open air, etc., and has a large room for promotion.

[0041] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A three-way sealing structure, characterized in that: It includes a shaft and an end cover, the end cover is arranged on the circumferential side of the shaft, a sealing ring is arranged between the end cover and the shaft, and a felt is arranged between the end cover and the sealing ring. The sealing ring body extends axially to form a medium sealing ring on both sides of the end cover. A plurality of protrusions are arranged on the medium sealing ring, and a plurality of grooves are arranged parallel to the corresponding protrusions on the end cover. The grooves and the protrusions cooperate to form a labyrinth seal and a non-contact gap seal. The sealing ring body extends axially to form a first medium sealing ring and a second medium sealing ring, and the first medium sealing ring and the second medium sealing ring are located on both sides of the end cover; The protrusion is an annular protrusion, and the groove is an annular groove; the depth of the groove is greater than the length of the protrusion, and the width of the groove is greater than the width of the protrusion.

2. A three-form bidirectional sealing structure according to claim 1, characterized in that: The outer diameter of the first medium sealing ring is smaller than the outer diameter of the second medium sealing ring.

3. A three-form bidirectional sealing structure according to claim 1, characterized in that: The protrusion is arranged closely against the outer side surface of the groove.

4. A three-form bidirectional sealing structure according to claim 1, characterized in that: The first medium sealing ring is provided with a plurality of protrusions, and the second medium sealing ring is provided with at least one protrusion.

5. A three-form bidirectional sealing structure according to claim 4, characterized in that: The cross section of the protrusion is rectangular.

6. A three-form bidirectional sealing structure according to claim 1, characterized in that: An oil return hole is provided on the end cover.

7. A three-form bidirectional sealing structure according to claim 6, characterized in that: The oil return hole is arranged on a side of the end cover close to the first medium sealing ring. One end of the oil return hole passes through the end cover, and the other end is connected to the groove on the inner side of the end cover.

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