A shaft sealing device in a horizontal screw centrifuge

Abstract

The present invention discloses an inter-axis sealing device in a horizontal screw centrifuge, comprising: an end cover shaft and a spline shaft movably arranged in the end cover shaft, a grease guide ring and a first annular support frame are arranged on the spline shaft, a second annular support frame is movably arranged on the inner side of the end cover shaft through the end cover, floating sealing rings are respectively sealed in the first and second annular support frames, the pair of sealing rings are respectively provided with sealing ring guide cone surfaces on the inner sides of their sealing surfaces, the grease guide ring is provided with a grease groove matching with a conical guide chamber surrounded by two sealing ring guide cone surfaces, a push cone surface section is arranged on the outer peripheral surface of each sealing ring on the side away from the other sealing ring, a supporting cone surface corresponding to the push cone surface section on the corresponding sealing ring is arranged on the first and second annular support frames, and a push seal ring is arranged between the pair of supporting cone surfaces and the push cone surface section on the corresponding sealing ring. The above-mentioned sealing device is particularly suitable for inter-axis sealing in a horizontal screw centrifuge.

Description

Technical Field

[0001] The invention relates to a horizontal screw centrifuge, in particular to an inter-axle sealing device in the horizontal screw centrifuge. Background Art

[0002] At present, the traditional inter-axis sealing device in the horizontal screw centrifuge includes: a pair of sealing rings arranged between the drum shaft (end cover shaft) and the spline shaft (spiral shaft). Since the pair of sealing rings adopts a dry contact sealing method, the wear between the sealing rings is relatively serious during actual use. Moreover, since there is no compensation mechanism between the pair of sealing rings, the sealing rings need to be replaced in a short time, which greatly increases the use cost and affects the production efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an inter-axial sealing device in a horizontal screw centrifuge which adopts a wet contact mode and can automatically compensate.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an inter-shaft sealing device in a horizontal screw centrifuge, comprising: an end cover shaft and a spline shaft, the spline shaft is movably arranged in the end cover shaft through an inter-shaft bearing, an annular mounting boss is arranged at the inner end of the spline shaft, a grease guide ring and a first annular support frame are sequentially sleeved between the inter-shaft bearing and the annular mounting boss, an inter-shaft sealing ring is arranged between the first annular support frame and the annular mounting boss, and a sealing ring between the end cover shaft and the spline shaft is arranged with the inter-shaft bearing. An annular grease passage communicating with the bearing, a grease injection passage communicating with the annular grease passage is arranged on the end cover shaft; an end cover is arranged on the inner side of the end cover shaft, and a second annular support frame cooperating with the first annular support frame is movably arranged on the end cover through an axial guide mechanism, so that the second annular support frame is stationary relative to the end cover in the circumferential direction and can move relative to the end cover in the axial direction, an inter-shaft frame sealing ring is arranged between the second annular support frame and the end cover shaft, and the second annular support frame is pressed against the outer ring of the inter-shaft bearing; the A pair of mutually matching sealing rings are provided on the spline shaft on the outer floating sleeve of the grease guide ring, and the pair of sealing rings are placed in the first annular support frame and the second annular support frame in a one-to-one correspondence. Annular sealing surfaces close to each other are respectively provided on the adjacent ends of the pair of sealing rings, and the pair of sealing rings are respectively provided with gradually separated sealing ring guide cone surfaces on the inner sides of their annular sealing surfaces, so that the pair of sealing rings form a conical guide chamber between the pair of sealing ring guide cone surfaces, and a grease groove is provided on the grease guide ring, so that the radial positive projection of the conical guide chamber is located in the grease groove of the grease guide ring, and an inter-ring frame sealing ring is provided between the first annular support frame and the second annular support frame and the corresponding sealing ring, and a push cone surface section is provided on the outer circumferential surface of the sealing ring on the side away from the other sealing ring, and a support cone surface corresponding to the push cone surface section on the corresponding sealing ring is provided on the first annular support frame and the second annular support frame, and a push sealing ring is provided between the support cone surface on the first annular support frame and the second annular support frame and the push cone surface section on the corresponding sealing ring.

[0005] As a preferred solution, in the inter-shaft sealing device in the horizontal screw centrifuge, a limiting nut is provided on the outer side of the inter-shaft bearing on the spline shaft.

[0006] As a preferred solution, in the inter-axial sealing device in the horizontal screw centrifuge, a diverter annular conical surface inclined outward is provided on the other end of the first annular support frame.

[0007] As a preferred embodiment, in the inter-axial sealing device in the horizontal screw centrifuge, the axial guide mechanism includes: an axial guide pin axially inserted in the end cover, an axial guide hole is opened on the second annular support frame, and the axial guide pin is movably inserted in the axial guide hole of the second annular support frame.

[0008] As a preferred embodiment, in the inter-axial sealing device in the horizontal screw centrifuge, the corresponding end of the first annular support frame extends into the corresponding end of the second annular support frame, and the outer side surface of the corresponding end of the first annular support frame and the inner side surface of the corresponding end of the second annular support frame are respectively provided with a support frame guide cone surface, and an oblique guide channel oblique to the sealing surface between the pair of sealing rings is formed between the support frame guide cone surfaces of the first annular support frame and the second annular support frame.

[0009] As a preferred solution, in the inter-axis sealing device in the horizontal screw centrifuge, the inter-axis bearing is a deep groove ball bearing.

[0010] As a preferred embodiment, in the inter-axial sealing device in the horizontal screw centrifuge, the second annular support frame is provided with an annular boss on the side close to the inter-axial bearing, and a plurality of grease holes are evenly opened on the annular boss along the circumferential direction.

[0011] As a preferred solution, in the inter-axle sealing device in the horizontal screw centrifuge, the grease injection channel is provided with an oil nozzle at the outward opening.

[0012] As a preferred solution, in the inter-axial sealing device in the horizontal screw centrifuge, the specific structure of the grease injection channel includes: a radial injection channel opening outward, and an axial injection channel connecting the radial injection channel and the annular grease passage.

[0013] As a preferred solution, in the inter-axle sealing device in the horizontal screw centrifuge, the side walls of the grease groove are conical surfaces with a smaller inner side and a larger outer side.

[0014] The beneficial effects of the present invention are as follows: on the one hand, by setting up relevant grease introduction structures such as grease injection channels, annular grease passages and grease guide grooves, the present invention makes a pair of sealing rings used for inter-shaft sealing in a wet contact state, thereby reducing the wear of the pair of sealing rings during relative rotation; on the other hand, by setting the pair of sealing rings as a floating structure, and setting up a sealing ring compensation mechanism between the first annular support frame and the second annular support frame and the corresponding sealing rings, which is mainly composed of a push cone segment on the sealing ring, a support cone on the first annular support frame and the second annular support frame, and a push seal ring between the support cone on the first annular support frame and the second annular support frame and the push cone segment on the corresponding sealing ring, the service life of the pair of sealing rings is greatly increased, and the production efficiency is improved. In addition, the sealing ring contact sealing method of the present invention has good adaptability to the vibration and radial runout of the rotating shaft, and has a low leakage rate, is safe and reliable, and has a long service life due to the good floating performance of the sealing ring and the low leakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structural diagram of the inter-axial sealing device in the horizontal screw centrifuge of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A.

[0017] Figure 1 to Figure 2 The reference numerals in the drawings are: 1, drum, 11, sealing ring, 12, sealing ring, 13, conical guide chamber, 2, second annular support frame, 21, support frame guide cone, 22, axial guide hole, 23, annular boss, 231, grease hole, 3, first annular support frame, 31, support frame guide cone, 33, diversion annular cone, 4, grease guide ring, 41, U-shaped grease groove, 5, axial guide pin shaft, 6, end cover, 7, end cover shaft, 71, radial injection channel, 72, axial injection channel, 81, push seal ring, 82, seal ring between ring frames, 83, bearing between shafts, 84, limit nut, 85, oil nozzle, 86, seal ring between shaft frames, 87, seal ring between shaft frames, 9, spiral assembly, 91, spline shaft, 911, annular mounting boss, 97, annular grease passage. DETAILED DESCRIPTION

[0018] The following is combined with Figures 1 to 2 , a specific implementation scheme of the inter-axis sealing device in a horizontal screw centrifuge described in the present invention is described in detail.

[0019] like Figure 1 As shown, the inter-axis sealing device in the horizontal screw centrifuge of the present invention comprises: an end cover shaft 7 for driving the rotating drum 1 to rotate, and a spline shaft 91 for driving the spiral assembly 9 to rotate. The spline shaft 91 is movably arranged in the end cover shaft 7 through a deep groove ball bearing (an open bearing) as an inter-axis bearing 83. The inner end of the spline shaft 91 is provided with an annular mounting boss 911. Figure 2As shown, the spline shaft 91 is provided with a grease guide ring 4 and a first annular support frame 3 in sequence between the inter-axial bearing 83 and the annular mounting boss 911, and a round nut as a limit nut 84 is provided on the spline shaft 91 on the outer side of the inter-axial bearing 83; an inter-axial frame sealing ring 87 (which belongs to the conventional technology in this field and is not described in detail here) is provided between the first annular support frame 3 and the annular mounting boss 911, an annular grease passage 97 communicating with the inter-axial bearing is provided between the end cover shaft 7 and the spline shaft 91, and a grease injection channel communicating with the annular grease passage 97 is provided on the end cover shaft 7. The specific structure of the grease injection channel includes: a radial injection channel 71 opening outward and an axial injection channel 72 connecting the radial injection channel 71 and the annular grease passage 97; an oil nozzle 85 is provided at the opening of the radial injection channel 71; the inner side of the end cover shaft 7 is provided on the end cover 6, and a second annular support frame 2 cooperating with the first annular support frame 3 is movably provided on the end cover 6 through an axial guide mechanism, so that the second annular support frame 2 is stationary relative to the end cover 6 in the circumferential direction and can move relative to the end cover 6 in the axial direction, and the axial guide mechanism includes: an axial guide pin 5 (which belongs to the conventional technology in this field and is used herein) which is axially penetrated in the end cover 6 The second annular support frame 2 is provided with an axial guide hole 22, and the axial guide pin shaft 5 is movably inserted into the axial guide hole 22 of the second annular support frame 2; an inter-shaft frame sealing ring 86 is provided between the second annular support frame 2 and the end cover shaft 7, and the corresponding end (the left end in the figure) of the second annular support frame 2 is pressed against the outer ring of the inter-shaft bearing 83; a pair of mutually matching sealing rings 11 and 12 are provided on the spline shaft 91 on the outer side of the grease guide ring 4 in a floating sleeve, and the pair of sealing rings 11 and 12 are placed in the first annular support frame 3 and the second annular support frame 2 in a one-to-one correspondence, and the pair of sealing rings 11 and 12 are placed in the first annular support frame 3 and the second annular support frame 2 in a one-to-one manner. 2 are respectively provided with annular sealing surfaces close to each other (it belongs to the conventional technology in this field and will not be described in detail here), and the pair of sealing rings 11 and 12 are respectively provided with gradually separated sealing ring guide cone surfaces on the inner sides of their annular sealing surfaces, so that the pair of sealing rings 11 and 12 form a conical guide chamber 13 between a pair of the sealing ring guide cone surfaces, and the grease guide ring 4 is provided with a U-shaped grease groove 41, so that the radial orthographic projection of the conical guide chamber 13 is located in the grease groove 41 of the grease guide ring 4, and the side walls of the U-shaped grease groove 41 are conical surfaces with a small inner side and a large outer side;An inter-ring seal ring 82 is provided between the first annular support frame 3 and the sealing ring 12, and between the second annular support frame 2 and the sealing ring 11. A push cone section is provided on the outer circumference of the sealing ring 11 on the side away from the sealing ring 12, and a push cone section is provided on the outer circumference of the sealing ring 12 on the side away from the sealing ring 11. The push cone sections on the sealing rings 11 and 12 are symmetrically arranged on both sides of the annular sealing surface between the sealing rings 11 and 12. A support cone surface corresponding to the push cone section on the sealing ring 12 is provided on the first annular support frame 3, and a support cone surface corresponding to the push cone section on the sealing ring 11 is provided on the second annular support frame 2. A push seal ring 81 is provided between the support cone surface on the first annular support frame 3 and the push cone section on the sealing ring 12, and between the support cone surface on the second annular support frame 2 and the push cone section on the sealing ring 11. In this embodiment, the corresponding ends (; Figure 1 The left end of the second annular support frame 2 extends into the corresponding end ( Figure 1 The other end of the first annular support frame 3 ( Figure 1 A diverter annular conical surface 33 is arranged obliquely outward on the right end of the first annular support frame 3, and the diverter annular conical surface 33 can divert part of the liquid, thereby reducing the liquid flowing to the sealing rings 11 and 12; a support frame guide conical surface 31 is arranged on the outer side surface of the left end of the first annular support frame 3, and a support frame guide conical surface 21 is arranged on the inner side surface of the right end of the second annular support frame 2, and an oblique support frame guide conical surface 31 of the first annular support frame 3 and the support frame guide conical surface 21 of the second annular support frame 2 are formed between The oblique flow guide channel of the annular sealing surface between the sealing rings 11 and 12 reduces the liquid under the action of centrifugal force when the sealing rings 11 and 12 rotate relative to each other, forming an oblique surface seal to a certain extent; the second annular support frame 2 is provided with an annular boss 23 on the side close to the inter-axial bearing 83, and a plurality of grease holes 231 (the number of grease holes 231 depends on the actual situation) are evenly opened on the annular boss 23 along the circumferential direction for connecting the inter-axial bearing 83 and the U-shaped oil finger groove 41.

[0020] The working principle of the present invention is as follows: a pair of push seal rings 81 are respectively located between the support cone surface of the seal ring 11 and the second annular support frame 2, and between the support cone surface of the seal 12 and the support cone surface of the first annular support frame 3. The axial component force generated by the push seal rings 81 keeps the seal rings 11 and 12 in close contact, and can form axial compensation after wear; the grease added through the oil nozzle 85 passes through the annular grease passage 97 and the inter-axial bearing 83 and the grease through hole 231 on the annular boss 23 and is stored in the U-shaped grease groove 41 of the grease guide ring 4. When the spline shaft 91 (helical shaft) and the end cover shaft 7 (drum shaft) rotate relative to each other, the grease stored in the U-shaped grease groove 41 of the grease guide ring 4 is thrown from the conical guide chamber 13 to the contact surface of the seal rings 11 and 12 to form an oil film, which plays a role in strengthening the seal and reducing the friction between the seal rings 11 and 12.

[0021] In summary, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made to the shape, structure, characteristics and spirit described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An inter-axis sealing device in a horizontal screw centrifuge, comprising: An end cap shaft and a spline shaft, the spline shaft is movably arranged in the end cap shaft through an inter-axial bearing, characterized in that an annular mounting boss is arranged at the inner end of the spline shaft, a grease guide ring and a first annular support frame are sequentially sleeved on the spline shaft between the inter-axial bearing and the annular mounting boss, an inter-shaft sealing ring is arranged between the first annular support frame and the annular mounting boss, an annular grease passage communicating with the inter-axial bearing is arranged between the end cap shaft and the spline shaft, and a grease injection channel communicating with the annular grease passage is arranged on the end cap shaft; an end cap is arranged on the inner side of the end cap shaft, and the end cap is provided with a grease injection channel communicating with the annular grease passage through the shaft A second annular support frame matched with the first annular support frame is movably provided in the guide mechanism, so that the second annular support frame is stationary relative to the end cover in the circumferential direction and can move relative to the end cover in the axial direction. A shaft frame sealing ring is provided between the second annular support frame and the end cover shaft, and the second annular support frame is pressed against the outer ring of the shaft bearing; a pair of mutually matching sealing rings are provided on the floating sleeve outside the grease guide ring on the spline shaft, and the pair of sealing rings are placed in the first annular support frame and the second annular support frame one by one, and annular sealing surfaces close to each other are respectively provided on adjacent ends of the pair of sealing rings, and the pair of sealing rings are respectively provided. A gradually separated sealing ring guide conical surface is arranged on the inner side of the annular sealing surface, so that the pair of sealing rings form a conical guide chamber between the pair of sealing ring guide conical surfaces, a grease groove is arranged on the grease guide ring, so that the radial positive projection of the conical guide chamber is located in the grease groove of the grease guide ring, an inter-ring frame sealing ring is arranged between the first annular support frame and the second annular support frame and the corresponding sealing ring, a push cone surface section is arranged on the outer peripheral surface of the sealing ring on the side away from the other sealing ring, and the first annular support frame and the second annular support frame are provided with a corresponding push cone surface section on the corresponding sealing ring. A support cone surface, a push sealing ring is arranged between the support cone surfaces on the first annular support frame and the second annular support frame and the push cone surface segments on the corresponding sealing rings; a diversion annular cone surface obliquely facing outward is arranged on the other end of the first annular support frame; the corresponding end of the first annular support frame extends into the corresponding end of the second annular support frame, and support frame guide cone surfaces are respectively arranged on the outer side surface of the corresponding end of the first annular support frame and the inner side surface of the corresponding end of the second annular support frame, and an oblique guide channel oblique to the sealing surface between the pair of sealing rings is formed between the support frame guide cone surfaces of the first annular support frame and the second annular support frame.

2. The inter-axial sealing device in the horizontal screw centrifuge according to claim 1, characterized in that: A limiting nut is arranged on the outer side of the inter-axial bearing on the spline shaft.

3. The inter-axis sealing device in the horizontal screw centrifuge according to claim 1, characterized in that: The axial guide mechanism comprises: an axial guide pin shaft axially penetrated in the end cover, an axial guide hole is opened on the second annular support frame, and the axial guide pin shaft is movably penetrated in the axial guide hole of the second annular support frame.

4. The inter-axis sealing device in the horizontal screw centrifuge according to claim 1, characterized in that: The inter-axial bearing is a deep groove ball bearing.

5. The inter-axis sealing device in the horizontal screw centrifuge according to claim 1, characterized in that: The second annular support frame is provided with an annular boss on a side close to the inter-axial bearing, and a plurality of grease holes are evenly opened on the annular boss along the circumferential direction.

6. The inter-axis sealing device in the horizontal screw centrifuge according to claim 1, characterized in that: The grease injection channel is provided with a grease nozzle at the outward opening.

7. The inter-axis sealing device in a horizontal screw centrifuge according to claim 1, characterized in that: The specific structure of the grease injection channel includes: a radial injection channel opening outward, and an axial injection channel connecting the radial injection channel and the annular grease passage.

8. The inter-shaft sealing device in a horizontal screw centrifuge according to any one of claims 1 to 7, characterized in that: The side walls of the grease groove are conical surfaces that are smaller inside and larger outside.

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