CN114321373A - Split type sealing device - Google Patents

Abstract

The invention discloses a split-type sealing device, comprising a support seat (1) and a cover plate (2) arranged outside a rotating shaft; the cover plate (2) is arranged at one end of the support seat (1), and the support A first sealing structure, a second sealing structure and a third sealing structure are sequentially arranged in the axial center hole of the seat (1), the inner walls of the first sealing structure, the second sealing structure and the third sealing structure and the outer wall of the rotating shaft A radial shrinkage adjustment structure is provided when worn, each seal (3) is annular and the inner wall is in close contact with the outer wall of the rotating shaft, the sealing end face of each seal (3) near the medium end and the end face of the mounting seat (4) Fit and seal. The sealing device adopts a multi-stage sealing structure to increase the sealing effect, and has a medium recovery channel between the adjacent two-stage sealing structures, so as to ensure that the leakage can be dealt with in time, avoid flowing into the outside world, and can realize radial shrinkage when worn. Adjustment, to ensure the seal between the shaft and the shaft.

Description

A split sealing device

technical field

The invention relates to the technical field of seals, in particular to a split-type sealing device.

Background technique

At present, there is a split seal, which includes a seal body in the shape of a semi-circular arc, the outer end surface of the seal body is provided with an annular inclined surface; the seal body is provided with a plurality of first penetrating between the inner and outer walls. Threaded holes, the axes of all the first threaded holes are located in the same plane and intersect with the axis of the seal body; the two ends of the seal body are provided with second threaded holes, and one end of the second threaded hole is located on the side of the seal body an end face, the other end is located on the outer side wall of the seal body, the second threaded hole extends to the outer wall of the seal body; the inner side of the seal body is provided with a first arc groove and an arc step surface; the seal Both ends of the part body are provided with a flow guide structure, one end of the flow guide structure is communicated with the first arc-shaped groove, and the other end is communicated with the outer side wall of the seal body body. The seal of the above structure has the following determinations:

1. The split seal of this structure is a single structure, and the sealing effect is poor.

2. The seals rely on bolts to fix the two semi-circular arc seal bodies together. When they are worn for a long time, they cannot compensate themselves and lose their sealing effect.

3. Due to the lack of compensation gap between several seals, that is, there is no moving empty space, the adjustment and sealing cannot be achieved by re-adjusting the bolts, and it needs to be replaced, which increases the cost of use.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a multi-stage sealing structure to increase the sealing effect, and there is a medium recovery channel between the adjacent two-stage sealing structures, so as to ensure that the leakage can be dealt with in time and avoid flowing into the outside world. , a split-type sealing device that can realize radial shrinkage adjustment and ensure sealing with the rotating shaft when worn.

The technical solution of the present invention is to provide a split sealing device with the following structure, comprising a support seat and a cover plate arranged outside the rotating shaft; the cover plate is arranged at one end of the support seat, and the axial direction of the support seat is A first sealing structure, a second sealing structure and a third sealing structure are arranged in the central hole in sequence, and the inner walls of the first sealing structure, the second sealing structure and the third sealing structure and the outer wall of the rotating shaft are provided with radial directions when worn. The shrinkage adjustment structure, the third sealing structure is close to the support seat, the first sealing structure, the second sealing structure and the third sealing structure are all provided with several groups of identical sealing members and a mounting seat for installing the sealing members; ring-shaped and the inner wall is in close contact with the outer wall of the rotating shaft, and the sealing end face near the medium end of each seal is fitted and sealed with the end face of the mounting seat; between the first sealing structure and the second sealing structure, the second sealing structure and the third sealing structure A medium recovery channel is arranged between the sealing structures.

The medium recovery channel is an annular groove and a through hole provided on the support seat, the inner end of the through hole communicates with the annular groove, and the outer end communicates with the recovery device.

The sealing element includes at least two annular structures composed of sealing blocks.

The radial shrinkage adjustment structure means that all adjacent sealing blocks are provided with gaps in the circumferential direction and are tightly sealed along the axial and radial positions, and the side walls of all the sealing blocks are located in the same cylinder. The side wall is provided with an annular elastic piece, which is used for radial positioning to form a circular ring.

One end of the sealing block is provided with a protruding block along the circumferential direction, and the other end is provided with a gap, and the gap extends to the end and the inner side wall of the sealing block; the protrusion of one sealing block in the adjacent sealing blocks Insert into the notch of another sealing block.

The protruding block includes an inner end surface and an outer side surface, and the notch includes a bottom surface and a side wall; the inner end surface of the convex strip on one of the adjacent sealing blocks is fitted with the bottom surface of the notch on the other end of the sealing block For sealing, the outer side surface of the convex strip on one of the adjacent sealing blocks is abutted with the side wall of the notch on the other end of the sealing block to seal.

A gap is provided between the end of the protruding strip on one of the adjacent sealing blocks and the inner end face of the notch on the other sealing block.

Each seal is provided with a plurality of elastic pins opposite to the sealing end face, the outer ends of the elastic pins protrude from the end face of the sealing element, the elastic pins are installed in the holes of the sealing element, and the holes are provided with springs One end of the spring is in contact with the bottom surface of the hole, and the other end is in contact with the inner end surface of the elastic pin. The seal is pushed by the elastic pin to make the sealing end surface fit with the end surface of the mounting seat to seal.

The outer side wall of the seal is provided with an annular groove, and an annular spring is arranged in the annular groove, and the annular spring positions all the sealing blocks to form a ring.

When the inner sidewall of the seal is worn and shrinks radially, the annular spring pushes all the sealing blocks radially to shrink radially, and the gap is shortened at this time.

After adopting the above structure, the present invention has the following advantages:

1. Since the axial center hole of the support seat is provided with a first sealing structure, a second sealing structure and a third sealing structure in sequence, that is, a multi-stage sealing structure is used to increase the sealing effect and more effectively prevent the medium from leaking to the outside world.

2. Since there are medium recovery channels between the first sealing structure and the second sealing structure, and between the second sealing structure and the third sealing structure, there are medium recovery channels between two adjacent sealing structures. When leakage occurs, the medium leaked from the first sealing structure flows out of the medium recovery channel for processing, and the medium leaked from the second sealing structure flows out of the medium recovery channel for processing, which can greatly reduce the sealing pressure of the final third sealing structure, thereby Ensure that the leakage can be dealt with in time to avoid inflow to the outside world

3. When the inner wall of the first sealing structure, the second sealing structure and the third sealing structure and the outer wall of the rotating shaft are worn, the self-adjustment can be realized through the radial shrinkage adjustment structure, so that the inner wall and the outer wall are always in contact with each other to ensure the contact with the rotating shaft. sealed between.

As an improvement, the medium recovery channel is an annular groove and a through hole provided on the support base 1, the inner end of the through hole communicates with the annular groove, and the outer end communicates with the recovery device, and the annular groove can be used for annular sealing Any leakage on the circumference of the structure can enter the annular groove, and then be discharged from the through hole, maximizing the reduction of the probability of leakage.

As an improvement, the radial shrinkage adjustment structure means that all adjacent sealing blocks are provided with gaps in the circumferential direction and are tightly sealed along the axial and radial positions, and the side walls of all the sealing blocks are located at the same The side wall of a cylinder is provided with an annular elastic member, which is used for radial positioning to form a circular ring, which can ensure the sealing performance between the assembled sealing blocks, and the elastic member can ensure the circumference of each sealing block. To the limit, to ensure the sealing effect at the end connection.

As an improvement, one end of the sealing block is provided with a protruding block protruding in the circumferential direction, and the other end is provided with a gap, the gap extends to the end and the inner side wall of the sealing block; one of the adjacent sealing blocks The convex block is embedded in the notch of another sealing block, which increases the positioning function of the two adjacent sealing blocks.

As an improvement, the protruding block includes an inner end surface and an outer side surface, and the notch includes a bottom surface and a side wall; the inner end surface of the protruding strip on one of the adjacent sealing blocks and the notch on the other end of the sealing block are different from each other. The bottom surface is fitted and sealed, and the outer side surface of the convex strip on one of the adjacent sealing blocks is fitted with the side wall of the notch on the other end of the sealing block to be sealed. The inner end surface of the protruding strip on one of the adjacent sealing blocks is fitted with the bottom surface of the notch on the other end of the sealing block to seal, and the function of this sealing is to seal between the inner wall and the outer wall; the adjacent sealing The outer side of the convex strip on one of the sealing blocks is sealed with the side wall of the notch on the other end of the sealing block. The inner wall and the outer wall and between the two end faces can be sealed.

As an improvement, a gap is provided between the end of the protruding strip on one of the adjacent sealing blocks and the inner end face of the notch on the other sealing block. When the inner wall of the sealing block is worn, the elastic member on the outer wall will The radial tension downward can make the sealing block radially shrink, and the gap provides space for shrinkage, so as to achieve radial self-compensation.

As an improvement, each seal is provided with several elastic pins opposite to the end face of the seal, the outer ends of the elastic pins protrude from the end face of the seal, and the elastic pins are installed in the holes of the seal and inside the holes A spring is provided, one end of the spring is in contact with the bottom surface of the hole, and the other end is in contact with the inner end surface of the elastic pin. The pins are evenly distributed along the circumference, so that the thrust is evenly distributed, and the elastic pins are used with simple structure and good reliability.

As an improvement, the outer side wall of the seal is provided with an annular groove, and an annular spring is arranged in the annular groove, and the annular spring positions all the sealing blocks to form a ring. It can be limited in the annular groove and has good reliability.

Description of drawings

FIG. 1 is a schematic cross-sectional view of the split sealing device of the present invention.

FIG. 2 is a schematic front view of the sealing member of the present invention.

FIG. 3 is a schematic view of the back of the sealing member of the present invention.

FIG. 4 is an exploded schematic diagram of the seal of the present invention.

FIG. 5 is a schematic diagram of one end of the sealing block of the present invention.

FIG. 6 is a schematic diagram of the other end of the sealing block of the present invention.

7 is a schematic cross-sectional view of the sealing member of the present invention.

Shown in the picture:

1. Support seat, 1.1, annular groove, 1.2, through hole,

2. Cover plate,

3. Seals, 3.1. Sealing blocks,

4. Mounting seat, 5. Elastic parts,

6. Bump, 6.1, inner face, 6.2, outer face,

7. Notch, 7.1, Bottom, 7.2, Sidewall,

8. Elastic pin,

9. Spring,

10. Ring spring,

11. Spindle.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-7, a split sealing device of the present invention includes a support base 1 and a cover plate 2 arranged outside the rotating shaft; the cover plate 2 is arranged at one end of the support base 1, and the support base The axial center hole of 1 is provided with a first sealing structure, a second sealing structure and a third sealing structure in sequence. There is a radial shrinkage adjustment structure, the third sealing structure is close to the support base 1, the first sealing structure, the second sealing structure and the third sealing structure are all provided with several groups of the same seals 3 and the installation of the mounting seals 3 Seat 4; each seal 3 is annular and the inner wall is in close contact with the outer wall of the rotating shaft.

A medium recovery channel is provided between the first sealing structure and the second sealing structure and between the second sealing structure and the third sealing structure. The medium recovery channel is an annular groove 1.1 and a through hole 1.2 provided on the support base 1. The inner end of the through hole 1.2 communicates with the annular groove 1.1, and the outer end communicates with the recovery device. The annular groove 1.1 between the first sealing structure and the second sealing structure is not in communication with the annular groove 1.1 between the second sealing structure and the third sealing structure, and the corresponding two through holes 1.2 are also not in communication. .

The sealing member 3 includes at least two annular structures composed of a sealing block 3.1, and three in this embodiment.

The radial shrinkage adjustment structure means that all adjacent sealing blocks 3.1 are provided with gaps in the circumferential direction, and are in close contact and sealed along the axial and radial positions. As shown in Figure 3, the spacing of the gap is a.

The side walls of all the sealing blocks 3.1 are located on the side walls of the same cylinder and are provided with an annular elastic piece 5, which is used for radial positioning to form a circular ring. The specific structure is as follows: the outer side wall of the sealing member 3 is provided with annular grooves 3.1. In this embodiment, there are two parallel grooves. Each annular groove 3.1 is provided with an annular spring 10, and the annular spring 10 connects all the The sealing block 3.1 is positioned to form a ring. When the inner sidewall of the sealing member 3 is worn out and shrinks radially, the annular spring 10 pulls all the sealing blocks 3.1 radially to shrink radially, and the gap a is shortened at this time until the inner wall of each sealing block 3.1 is tightly connected to the outer wall of the rotating shaft The sealing block 3.1 is locked on the outer wall of the rotating shaft under the action of the ring spring 10 at this time.

One end of the sealing block 3.1 is provided with a protrusion 6 protruding in the circumferential direction, and the other end is provided with a gap 7, which extends to the end and inner side wall of the sealing block 3.1; The bump 6 of one sealing block 3.1 is inserted into the notch 7 of the other sealing block 3.1. The first positions of the three sealing blocks 3.1 in this embodiment are connected in sequence.

The convex block 6 includes an inner end surface 6.1 and an outer side surface 6.2, the gap 7 includes a bottom surface 7.1 and a side wall 7.2; the inner end surface 6.1 and the other end of the convex strip 6 on one of the adjacent sealing blocks 3.1 The bottom surface 7.1 of the gap 7 on the sealing block 3.1 is fitted and sealed, and the function of the seal is to seal between the inner wall and the outer wall.

The outer side surface 6.2 of the protruding strip 6 on one of the adjacent sealing blocks 3.1 and the side wall 7.2 of the notch 7 on the sealing block 3.1 at the other end are fitted and sealed, and the sealing is between the end faces at both ends. seal.

A gap a is provided between the end 6.3 of the protruding strip 6 on one of the adjacent sealing blocks 3.1 and the inner end surface 7.3 of the notch 7 on the other sealing block 3.1, and the gap a provides the sealing block 3.1 Space for radial sliding.

As shown in FIG. 7 , each seal 3 is provided with a plurality of elastic pins 8 on the opposite side of the sealing end face. The outer ends of the elastic pins 8 protrude from the end surface of the seal 3 . A spring 9 is arranged in the hole of the sealing element 3, the diameter of the elastic pin 8 is smaller than the inner diameter of the hole of the sealing element 3, and the tail end of the elastic pin 8 can be telescopic in the hole. The inner end of the elastic pin 8 is provided with a boss, and the outer end of the hole of the sealing member 3 is provided with an inner constriction. One end of the spring 9 is in contact with the bottom surface of the hole, and the other end is in contact with the inner end surface of the elastic pin 8 .

Claims (10)

1. A split-type sealing device, characterized in that: it comprises a support seat (1) and a cover plate (2) arranged outside the rotating shaft; the cover plate (2) is arranged at one end of the support seat (1), so that the The axial center hole of the support seat (1) is provided with a first sealing structure, a second sealing structure and a third sealing structure in sequence, and the inner walls of the first sealing structure, the second sealing structure and the third sealing structure are connected to the rotating shaft. The outer wall of the outer wall is provided with a radial shrinkage adjustment structure when worn, and the third sealing structure is close to the support seat (1), and the first sealing structure, the second sealing structure and the third sealing structure are all provided with several groups of the same seals (3 ) and the mounting seat (4) for installing the sealing element (3); each sealing element (3) is annular and the inner wall is in close contact with the outer wall of the rotating shaft. 4) The end surfaces are attached and sealed; medium recovery channels are provided between the first sealing structure and the second sealing structure, and between the second sealing structure and the third sealing structure. 2. A split sealing device according to claim 1, characterized in that: the medium recovery channel is an annular groove (1.1) and a through hole (1.2) provided on the support seat (1), so The inner end of the through hole (1.2) communicates with the annular groove (1.1), and the outer end communicates with the recovery device. 3 . The split sealing device according to claim 1 , wherein the sealing member ( 3 ) comprises an annular structure composed of at least two sealing blocks ( 3.1 ). 4 . 4. A split-type sealing device according to claim 1, 2 or 3, characterized in that: the radial shrinkage adjustment structure refers to the circumferential direction between all adjacent sealing blocks (3.1). There are gaps and are tightly sealed along the axial and radial positions. The side walls of all the sealing blocks (3.1) are located on the side walls of the same cylinder and are provided with annular elastic parts (5). The elastic parts (5) ) is used for radial positioning to form a ring. 5. A split sealing device according to claim 4, characterized in that: one end of the sealing block (3.1) is provided with a protruding block (6) along the circumferential direction, and the other end is provided with a gap (7), the gap (7) extends to the end and inner side wall of the sealing block (3.1); the protrusion (6) of one sealing block (3.1) in the adjacent sealing blocks (3.1) is embedded in the other sealing block Notch (7) of (3.1). 6. A split-type sealing device according to claim 5, characterized in that: the protrusion (6) comprises an inner end surface (6.1) and an outer side surface (6.2), and the gap (7) comprises a bottom surface (6.2). 7.1) and side wall (7.2); the inner end face (6.1) of the convex strip (6) on one of the adjacent sealing blocks (3.1) and the notch on the other end of the sealing block (3.1) The bottom surface (7.1) of (7) is fitted and sealed, and the outer side (6.2) of the protruding strip (6) on one of the adjacent sealing blocks (3.1) is connected to the sealing block (3.1) at the other end. ) on the side wall (7.2) of the notch (7) to fit and seal. 7. A split sealing device according to claim 5, characterized in that: the end (6.3) of the protruding strip (6) on one of the adjacent sealing blocks (3.1) (3.1) A gap (a) is provided between the inner end face (7.3) of the notch (7) on the other sealing block (3.1). 8. A split-type sealing device according to claim 1, wherein a plurality of elastic pins (8) are provided on each sealing member (3) opposite to the sealing end face, and the elastic pins (8) The outer end of ) protrudes from the end face of the seal (3), the elastic pin (8) is installed in the hole of the seal (3) and a spring (9) is arranged in the hole, and one end of the spring (9) The other end is in contact with the bottom surface of the hole, and the other end is in contact with the inner end surface of the elastic pin (8). . 9. A split sealing device according to claim 1 or 3, characterized in that: an annular groove (3.1) is provided on the outer side wall of the sealing member (3), and the annular groove (3.1) An annular spring (10) is provided inside, and the annular spring (10) positions all the sealing blocks (3.1) to form a ring. 10. The split sealing device according to any one of claims 1-9, characterized in that: when the inner side wall of the sealing member (3) is worn and radially shrinks, the diameter of the annular spring (10) Push all the sealing blocks (3.1) radially to shrink, at this time the gap (a) is shortened.

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