CN212508956U - Sealing structure and vertical split type centrifugal blower - Google Patents

Abstract

The utility model relates to a sealed technical field provides a seal structure and perpendicular subdivision formula centrifugal blower. Wherein, this seal structure is arranged in vertical subdivision formula centrifugal blower, and vertical subdivision formula centrifugal blower includes: at least two impellers (11), set up middle section (18) and stator (17) between impeller (11) at different levels, the department of meeting of middle section (18) and impeller (11), the department of meeting of stator (17) and impeller (11) all is provided with seal structure, seal structure includes the seal, sealing ring (10) and elastic component, the seal includes annular perisporium (1), the internal face butt that elastic component and perisporium (1) are passed through to the outer peripheral edge of sealing ring (10), so that sealing ring (10) can be for perisporium (1) along the radial of perisporium (1) float. The sealing structure and the vertical split centrifugal blower are not easy to cause rotor locking, and the safety performance is improved.

Description

Sealing structure and vertical split type centrifugal blower

Technical Field

The utility model relates to a sealed technical field specifically relates to a seal structure and perpendicular subdivision formula centrifugal blower.

Background

With the rapid development of petroleum, coal chemical industry and thermal power generation enterprises, environmental protection and standard discharge of sewage treatment are important factors influencing the long-term development of each enterprise. Domestic sewage treatment aeration system fans all adopt domestic multistage centrifugal high-efficiency blowers, the blower structure is vertically split, and the impeller is made of cast aluminum alloy. When system pressure fluctuation and surging occur in the operation, the blower rotor and the shell sealing ring can be subjected to collision and grinding, the existing blower seal is of an integrally cast labyrinth seal structure, the integrally cast labyrinth seal structure is fixed on the shell, the concentricity of the blower rotor and the seal structure under the abnormal working condition of the blower cannot be met, the rotor locking phenomenon is easily generated, and the safe operation of the blower is restricted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the perpendicular subdivision formula centrifugal blower among the prior art and producing rotor locking, the relatively poor problem of security easily, providing a seal structure and perpendicular subdivision formula centrifugal blower, this seal structure and perpendicular subdivision formula centrifugal blower are difficult for producing the rotor locking, have improved the security performance.

In order to achieve the above object, an aspect of the present invention provides a seal structure for use in a vertical split centrifugal blower, the vertical split centrifugal blower including: at least two impellers set up in at different levels middle section and stator between the impeller, the middle section with the department of meeting of impeller the stator with the department of meeting of impeller all is provided with seal structure, its characterized in that, seal structure includes seal, sealing ring and elastic component, the seal includes annular perisporium, the outer peripheral edges of sealing ring pass through the elastic component with the internal face butt of perisporium, so that the sealing ring can for the perisporium is followed the radial of perisporium is floated.

Preferably, the elastic member is a disc spring.

Preferably, an annular groove corresponding to the sealing ring is formed on the inner wall surface of the peripheral wall in a recessed manner in the direction of the outer wall surface of the peripheral wall, and the disc spring is arranged in the annular groove.

Preferably, the inner ring of the seal ring is formed as a slope so that the seal ring can be in line contact with the impeller; and/or

The inner wall surface of the circumferential wall is provided with a plurality of annular grooves which are arranged at intervals along the axial direction of the circumferential wall, and the sealing structure comprises a plurality of sealing rings which are in one-to-one correspondence with the plurality of annular grooves.

Preferably, the sealing structure comprises an annular gasket, the annular gasket is clamped between two adjacent sealing rings, and the inner diameter of each sealing ring is smaller than that of each annular gasket.

Preferably, the seal includes lateral wall and locating pin axle, the lateral wall be the annular setting and with one side of perisporium is connected, be located the inlayer the sealing ring with the internal face laminating setting of lateral wall, be provided with first locating hole on the lateral wall, be provided with on the annular gasket with the second locating hole that first locating hole corresponds, be provided with on the sealing ring with the round hole that first locating hole corresponds, the locating pin axle passes respectively the round hole the second locating hole and first locating hole, with the location the annular gasket with the sealing ring, the round hole with have between the locating pin axle and be used for making the sealing ring is followed the radial unsteady clearance of perisporium.

Preferably, seal structure includes annular stop collar, stop collar establishes in outmost the sealing ring is kept away from one side of lateral wall, so that the sealing ring with annular gasket is spacing the stop collar with between the lateral wall, be formed with first semicircle on the outer edge of stop collar and prevent changeing the hole, be formed with on the internal face of perisporium with first semicircle prevents changeing the second semicircle that the hole corresponds and prevent changeing the hole, first semicircle prevent changeing the hole with the second semicircle prevents changeing downthehole inserting and prevent changeing the pin.

Preferably, an annular clamp spring groove is formed in the inner wall of the peripheral wall in a concave mode towards the outer wall surface of the peripheral wall, the clamp spring groove is communicated with the second semicircular anti-rotation hole, a clamp spring is arranged in the clamp spring groove, and the clamp spring is abutted to one surface, far away from the side wall, of the limiting sleeve to fix the limiting sleeve.

Preferably, a third positioning hole is formed in the limiting sleeve, and one end, far away from the side wall, of the positioning pin shaft is located in the third positioning hole.

The utility model discloses the second aspect provides a perpendicular subdivision formula centrifugal blower, perpendicular subdivision formula centrifugal blower includes: at least two impellers; set up in at different levels middle section and stator between the impeller, the middle section with the department of meeting of impeller the stator with the department of meeting of impeller all is provided with as above seal structure.

Through above-mentioned technical scheme, the sealing ring can be for the radial floating of perisporium, and when centrifugal blower in service system pressure surge unusually, the impeller of air-blower takes place to bump with the sealing ring when grinding, and the sealing ring can automatic adjustment, avoids sealing ring and impeller to take place the phenomenon of adhesion to make centrifugal blower be difficult for producing the phenomenon that the rotor locked, improved the security performance.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a seal structure of the present invention;

FIG. 2 is a schematic structural view of the seal structure shown in FIG. 1 after engagement with an impeller;

fig. 3 is a partial structural schematic view of the vertical split centrifugal blower of the present invention.

Description of the reference numerals

1. A peripheral wall; 2. an annular groove; 3. a side wall; 4. a disc spring; 5. anti-rotation pins; 6. a clamp spring; 7. positioning a pin shaft; 8. a limiting sleeve; 9. an annular gasket; 10. a seal ring; 11. an impeller; 12. an inlet; 13. at the interstage; 14. a rotating shaft; 15. a connecting member; 16. bolt holes; 17. a guide vane; 18. and a middle section.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise stated, "inside and outside" are used, with respect to the side wall 3, the inside being close to the side wall 3 and the outside being far from the side wall 3.

An aspect of the utility model is to provide a sealing structure for in the perpendicular subdivision formula centrifugal blower, perpendicular subdivision formula centrifugal blower includes: at least two impellers 11 set up in at different levels middle section 18 and stator 17 between the impeller 11, middle section 18 with the department of meeting of impeller 11 stator 17 with the department of meeting of impeller 11 all is provided with seal structure, seal structure includes seal, sealing ring 10 and elastic component, the seal includes annular perisporium 1, the outer peripheral edges of sealing ring 10 pass through the elastic component with the internal face butt of perisporium 1, so that sealing ring 10 can follow for perisporium 1 the radial of perisporium 1 floats. The sealing ring 10 is provided in plurality, the sealing rings 10 are provided at intervals to form a labyrinth seal, the inner ring of the sealing ring 10 is in direct contact with the impeller 11, as shown in fig. 2-3, the sealing structure is sleeved outside the interstage 13 and the inlet 12 of the impeller 11 (both ends of the impeller 11 in the axial direction), the inner diameter of the sealing ring 10 is determined according to the size of the inlet 12 or the interstage 13 of the impeller 11, and the outer diameter of the sealing ring 10 is smaller than the inner diameter of the peripheral wall 1. The middle section 18 and the guide vane 17 separate each stage of impeller 11 of the centrifugal blower, a continuous flow channel is formed among the middle section 18, the guide vane 17 and each stage of impeller 11, gas enters the centrifugal blower from an air inlet of the centrifugal blower, passes through the first stage impeller 11, enters the continuous flow channel, converts kinetic energy into pressure energy through the guide vane 17, then enters the next stage impeller 11, and is discharged from an air outlet of the centrifugal blower after sequentially passing through each stage of impeller 11.

Through the scheme, the sealing ring 10 can float in the radial direction relative to the peripheral wall 1, when the system pressure surges abnormally during the operation of the centrifugal blower, and the impeller 11 and the sealing ring 10 of the blower are rubbed and abraded, the sealing ring 10 can be automatically adjusted, so that the phenomenon that the sealing ring 10 and the impeller 11 are adhered is avoided, the centrifugal blower is not easy to generate the phenomenon that a rotor (the rotor comprises the rotating shaft 14 and the impeller 11 arranged on the rotating shaft 14) is locked, and the safety performance is improved.

Preferably, the sealing ring 10 is made of a material with good lubricity and good thermal conductivity to prevent the impeller 11 from being stuck when contacting the sealing ring 10. Specifically, the seal ring 10 may be made of a copper alloy material.

In one embodiment, the elastic member is a disc spring 4. As another embodiment, the elastic member may be a spring.

As an embodiment, as shown in fig. 1, an annular groove 2 corresponding to the seal ring 10 is formed on the inner wall surface of the peripheral wall 1 in a recessed manner in the direction of the outer wall surface of the peripheral wall 1, and the disc spring 4 is disposed in the annular groove 2. Preferably, the width of the annular groove 2 (the distance between two groove walls of the annular groove 2) is the same as the thickness of the sealing ring 10, and the depth of the annular groove 2 (the distance between the groove opening of the annular groove 2 and the groove bottom) is the same as the thickness of the disc spring 4, that is, when the disc spring 4 is in a relaxed state, the sealing ring 10 is located outside the annular groove 2, and when the disc spring 4 is pressed by the sealing ring 10, the sealing ring 10 enters the annular groove 2.

As an embodiment, a plurality of the annular grooves 2 are formed on the inner wall surface of the peripheral wall 1 at intervals along the axial direction of the peripheral wall 1, and the sealing structure includes a plurality of the sealing rings 10 corresponding to the plurality of the annular grooves 2 one to one.

As an embodiment, as shown in fig. 1 to 2, an inner ring of the seal ring 10 is formed as a slope so that the seal ring 10 can be in line contact with the impeller 11. By chamfering the inner ring of the seal ring 10, the contact end face of the seal ring 10 and the impeller 11 is a tip, so that the contact area between the seal ring 10 and the impeller 11 can be reduced, and the temperature of the impeller 11 during the rubbing process can be reduced when the impeller 11 and the seal ring 10 are rubbed.

As an embodiment, as shown in fig. 1, the sealing structure includes an annular gasket 9, the annular gasket 9 is sandwiched between two adjacent sealing rings 10, and an inner diameter of each sealing ring 10 is smaller than an inner diameter of each annular gasket 9, so as to ensure that the annular gasket 9 does not contact with the impeller 11, and only contacts with the impeller 11 through the sealing ring 10. The sealing rings 10 are stacked in sequence with the annular gasket 9 from a position close to the side wall 3, and the annular gasket 9 is used for separating two adjacent sealing rings 10. As shown in fig. 1, the thickness of the annular gasket 9 is the same as the thickness of the sealing ring 10, the thickness of the annular gasket 9 may also be different from the thickness of the sealing ring 10, and the thickness of the annular gasket 9 may be determined according to the depth of the sealing cavity formed by the peripheral wall 1 and the side wall 3 (which refers to the distance between the end surface of the peripheral wall 1, which is far away from the side wall 3, and the side wall 3), the thickness and number of the sealing rings 10, the number of the annular gaskets 9, and other parameters.

As an implementation mode, as shown in fig. 1, the sealing body includes a side wall 3 and a positioning pin 7, the side wall 3 is disposed in an annular shape and is connected to one side of the peripheral wall 1, the innermost sealing ring 10 is disposed on an inner wall surface of the side wall 3, a first positioning hole is disposed on the side wall 3, a second positioning hole corresponding to the first positioning hole is disposed on the annular gasket 9, a circular hole corresponding to the first positioning hole is disposed on the sealing ring 10, the positioning pin 7 passes through the circular hole, the second positioning hole and the first positioning hole respectively to position the annular gasket 9 and the sealing ring 10, and a gap for making the sealing ring 10 float along a radial direction of the peripheral wall 1 is formed between the circular hole and the positioning pin 7. The first seal ring 10 abutting the side wall 3 is the innermost seal ring 10 and the seal ring 10 furthest from the side wall 3 is the outermost seal ring 10. Through locating pin axle 7 location sealing ring 10 and annular gasket 9 can make sealing ring 10 and annular gasket 9 change conveniently, when the wearing and tearing clearance of sealing ring 10 exceeds standard, only need change sealing ring 10, need not to change other accessories, can reduce the maintenance cost of equipment.

The side wall 3 and the annular gasket 9 are in small clearance fit with the positioning pin shaft 7 through a first positioning hole and a second positioning hole respectively, and the sealing ring 10 is in large clearance fit with the positioning pin shaft 7 through a circular hole, so that the sealing ring 10 can float up and down in the radial direction relative to the positioning pin shaft 7.

Preferably, the first positioning hole, the second positioning hole and the round hole are all provided in a plurality of numbers so as to ensure the structural stability.

Preferably, the outer peripheral edge of the annular gasket 9 abuts against the inner wall surface of the peripheral wall 1 with a small clearance fit.

Preferably, the positioning pin 7 has a step structure.

As an implementation manner, as shown in fig. 1, the sealing structure includes an annular stop collar 8, the stop collar 8 is disposed at one side of the outermost sealing ring 10 away from the side wall 3, so that the sealing ring 10 and the annular gasket 9 are limited between the stop collar 8 and the side wall 3, a first semicircular anti-rotation hole is formed on an outer edge of the stop collar 8, a second semicircular anti-rotation hole corresponding to the first semicircular anti-rotation hole is formed on an inner wall surface of the peripheral wall 1, and an anti-rotation pin 5 is inserted into the first semicircular anti-rotation hole and the second semicircular anti-rotation hole. Namely, the limiting sleeve 8 is positioned at the outermost layer of a sealing cavity formed by the peripheral wall 1 and the side wall 3, and the sealing ring 10 and the annular gasket 9 are stacked between the side wall 3 and the limiting sleeve 8. The stopper sleeve 8 serves to limit the position of the seal ring 10 and the annular gasket 9 in the axial direction of the peripheral wall 1. The stop collar 8 is annular, the internal diameter of stop collar 8 is greater than the internal diameter of sealing ring 10 and is equal to the internal diameter of annular gasket 9. The outer periphery of the limiting sleeve 8 is abutted against the inner wall surface of the peripheral wall 1, and the limiting sleeve and the inner wall surface are in small clearance fit.

Preferably, the first semicircular anti-rotation hole, the second semicircular anti-rotation hole and the anti-rotation pin 5 are all provided in a plurality of numbers, and the size of the first semicircular anti-rotation hole is the same as that of the second semicircular anti-rotation hole.

Preferably, the outer side surface (the surface far away from the side wall 3) of the stop collar 8 is flush with the end surface of the end of the peripheral wall 1 far away from the side wall 3, and the side wall 3 is connected with the other end surface of the peripheral wall 1. Preferably, the peripheral wall 1 is provided in one piece with the side wall 3.

As an implementation manner, as shown in fig. 1, an annular snap spring groove is formed by the inner wall of the peripheral wall 1 being recessed towards the outer wall of the peripheral wall 1, the snap spring groove is communicated with the second semicircular anti-rotation hole, a snap spring 6 is arranged in the snap spring groove, and the snap spring 6 abuts against one surface (outer side surface) of the stop collar 8 far away from the side wall 3 to fix the stop collar 8. The limiting sleeve 8 comprises a first part close to the peripheral wall 1 and a second part far away from the peripheral wall 1, the first part and the second part are formed into an integral piece, the thickness of the first part is smaller than that of the second part, a step shape is formed between the first part and the second part, one surface (outer side surface) of the second part far away from the side wall 3 is flush with the end surface of one end, far away from the side wall 3, of the peripheral wall 1, the surface (outer side surface) of the first part far away from the side wall 3 is located on the inner side of the end surface of one end, far away from the side wall 3, of the peripheral wall 1, so that the clamp spring 6 can be conveniently installed in a space formed between the first part and the peripheral wall 1, and particularly, the.

Preferably, the depth of the jump ring groove is deeper than the depth of a second semicircular anti-rotation hole, which is formed by recessing the groove wall of the jump ring groove in the direction of the side wall 3, and the depth is extended in the direction of the inner wall of the peripheral wall 1 toward the outer wall surface of the peripheral wall 1.

As an embodiment, as shown in fig. 1, a third positioning hole is provided on the position-limiting sleeve 8, and one end of the positioning pin 7, which is far away from the side wall 3, is located in the third positioning hole. The third positioning hole is in one-to-one correspondence with the first positioning hole, the second positioning hole and the round hole, the sealing ring 10, the annular gasket 9, the limiting sleeve 8 and the side wall 3 are positioned through the positioning pin 7, and the limiting sleeve 8 is in small clearance fit with the positioning pin 7 through the third positioning hole.

As an embodiment, as shown in fig. 1, the sealing structure comprises a connection 15 for connecting with a guide vane 17 and a middle section 18 of the blower. The connecting piece is a ring-shaped piece and is connected with the outer wall surface of the peripheral wall 1, a plurality of bolt holes 16 for connection are formed in the connecting piece 15, and the sealing structure is connected with the guide vane 17 and the middle section 18 through bolts and the bolt holes 16 in the connecting piece 15. Preferably, the connecting member 15, the peripheral wall 1 and the side wall 3 are formed into a single piece, which together form a sealing body of a sealing structure, the peripheral wall 1 and the side wall 3 together form a sealing cavity of the sealing structure, and the sealing ring 10, the annular gasket 9, so the stop collar 8 and other structures are all arranged in the sealing cavity.

The utility model discloses a second aspect provides a vertical split centrifugal blower, as shown in FIG. 3, vertical split centrifugal blower includes: at least two impellers 11; and the middle section 18 and the guide vanes 17 are arranged between the impellers 11 at each stage, and the connection part of the middle section 18 and the impeller 11 and the connection part of the guide vanes 17 and the impeller 11 are both provided with the sealing structure. As shown in fig. 2 to 3, the seal structure is provided outside the interstage 13 and the inlet 12 of the impeller 11 (both ends in the axial direction of the impeller 11). The middle section 18 and the guide vane 17 separate each stage of impeller 11 of the centrifugal blower, the middle section 18, the guide vane 17 and each stage of impeller 11 form a continuous flow channel, gas enters the centrifugal blower from an air inlet of the centrifugal blower, passes through the first stage impeller 11, enters a channel formed by the middle section 18 and the guide vane 17, converts kinetic energy into pressure energy through the guide vane 17, then enters the next stage impeller 11, and is discharged from an air outlet of the centrifugal blower after sequentially passing through each stage of impeller 11. A plurality of sealing rings 10 arranged at intervals are in direct contact with the impeller 11 to form movable labyrinth seals, each sealing ring 10 is connected with the peripheral wall 1 through a disc spring 4, when system pressure surges abnormally during operation of the air blower, the positions of the sealing rings 10 can be automatically adjusted, the concentricity of the impeller 11 and the sealing structure when the air blower is abnormal is ensured, and the phenomenon that the sealing rings 10 and the impeller 11 are adhered is avoided.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, changes the round hole into elliptical aperture etc. for example. Including each of the specific features, are combined in any suitable manner. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims (10)

1. A seal structure for use in a vertical split centrifugal blower, the vertical split centrifugal blower comprising:

at least two impellers (11),

a middle section (18) and a guide vane (17) which are arranged between the impellers (11) of each stage, wherein the sealing structure is arranged at the joint of the middle section (18) and the impeller (11) and the joint of the guide vane (17) and the impeller (11),

the sealing structure is characterized by comprising a sealing body, a sealing ring (10) and an elastic piece, wherein the sealing body comprises an annular peripheral wall (1), the outer periphery of the sealing ring (10) is abutted to the inner wall surface of the peripheral wall (1) through the elastic piece, so that the sealing ring (10) can float relative to the peripheral wall (1) along the radial direction of the peripheral wall (1).

2. A sealing arrangement according to claim 1, characterised in that the resilient member is a disc spring (4).

3. The sealing structure according to claim 2, characterized in that an annular groove (2) corresponding to the sealing ring (10) is formed on the inner wall surface of the peripheral wall (1) in a recessed manner in the direction of the outer wall surface of the peripheral wall (1), and the disc spring (4) is disposed in the annular groove (2).

4. The sealing structure of claim 3,

the inner ring of the sealing ring (10) is formed into a slope so that the sealing ring (10) can be in line contact with the impeller (11); and/or

The sealing structure is characterized in that a plurality of annular grooves (2) are formed in the inner wall surface of the peripheral wall (1) and are arranged at intervals along the axial direction of the peripheral wall (1), and the sealing structure comprises a plurality of sealing rings (10) which correspond to the annular grooves (2) one to one.

5. The sealing structure according to claim 4, characterized in that it comprises an annular gasket (9), said annular gasket (9) being interposed between two adjacent sealing rings (10), said sealing rings (10) having an inner diameter smaller than the inner diameter of said annular gasket (9).

6. The sealing structure according to claim 5, characterized in that the sealing body comprises a side wall (3) and a positioning pin (7), the side wall (3) is annularly arranged and connected with one side of the peripheral wall (1), the sealing ring (10) positioned at the innermost layer is attached to the inner wall surface of the side wall (3), a first positioning hole is arranged on the side wall (3), a second positioning hole corresponding to the first positioning hole is arranged on the annular gasket (9), a round hole corresponding to the first positioning hole is arranged on the sealing ring (10), the positioning pin shaft (7) respectively penetrates through the round hole, the second positioning hole and the first positioning hole, so as to position the annular gasket (9) and the sealing ring (10), and a gap for enabling the sealing ring (10) to float along the radial direction of the peripheral wall (1) is arranged between the round hole and the positioning pin shaft (7).

7. The sealing structure according to claim 6, characterized in that the sealing structure comprises an annular limiting sleeve (8), the limiting sleeve (8) is arranged on one side of the outermost sealing ring (10) far away from the side wall (3) so that the sealing ring (10) and the annular gasket (9) are limited between the limiting sleeve (8) and the side wall (3), a first semicircular anti-rotation hole is formed on the outer edge of the limiting sleeve (8), a second semicircular anti-rotation hole corresponding to the first semicircular anti-rotation hole is formed on the inner wall surface of the peripheral wall (1), and an anti-rotation pin (5) is inserted into the first semicircular anti-rotation hole and the second semicircular anti-rotation hole.

8. The sealing structure according to claim 7, characterized in that an annular snap spring groove is formed on the inner wall of the peripheral wall (1) in a concave manner facing the outer wall surface of the peripheral wall (1), the snap spring groove is communicated with the second semicircular anti-rotation hole, a snap spring (6) is arranged in the snap spring groove, and the snap spring (6) is abutted against one surface of the stop collar (8) far away from the side wall (3) so as to fix the stop collar (8).

9. The sealing structure according to claim 7, wherein a third positioning hole is formed in the position-limiting sleeve (8), and one end of the positioning pin (7) far away from the side wall (3) is located in the third positioning hole.

10. A vertical split centrifugal blower comprising:

at least two impellers (11);

the middle section (18) and the guide vane (17) are arranged between the impellers (11) of all stages, and the sealing structure of any one of claims 1 to 9 is arranged at the joint of the middle section (18) and the impeller (11) and the joint of the guide vane (17) and the impeller (11).

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