CN115289221A

CN115289221A - Broach seal structure and compressor

Info

Publication number: CN115289221A
Application number: CN202210939932.7A
Authority: CN
Inventors: 舒晨旭; 叶文腾; 董迎波; 钟瑞兴
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-11-04

Abstract

The invention provides a comb tooth sealing structure and a compressor. The comb tooth sealing structure is applied to the first structure of predetermineeing and the second of predetermineeing of relative pivoted and predetermines structurally, comb tooth sealing structure including set up in a plurality of cooperation grooves on the first structure of predetermineeing with set up in a plurality of cooperation structures on the second structure of predetermineeing. The comb tooth sealing structure and the compressor provided by the invention have the advantages that the linear flow path is adjusted to be in a zigzag shape by utilizing the protrusions and the matching grooves, the flow direction of gas is changed to cause certain flow loss, meanwhile, after the gas flows into the cavity, the gas is equivalent to be subjected to once throttling expansion to consume part of energy of the gas, most of the gas continues to flow along the inner wall of the cavity under the action of inertia, and moves in a reverse pressure gradient manner under the guide of the arc-shaped structure of the inner wall to consume kinetic energy.

Description

Broach seal structure and compressor

Technical Field

The invention relates to the technical field of sealing structures, in particular to a comb tooth sealing structure and a compressor.

Background

The energy efficiency of the centrifugal compressor is an important index for measuring the quality of one compressor, and in order to achieve higher energy efficiency, the leakage loss in the compressor is required to be reduced.

But current broach seal structure only sets up the recess in single structure and realizes producing the flow resistance to the air current, has the route that the air current straight line flows between broach seal structure's high-pressure side and low pressure side for broach seal structure still has the part to reveal, causes the poor problem of sealed effect.

Disclosure of Invention

In order to solve the technical problem of poor sealing effect of the comb tooth sealing structure in the prior art, the comb tooth sealing structure and the compressor are provided with the protrusions, the cavity and the matching grooves to increase the sealing effect.

The utility model provides a broach seal structure, but be applied to relatively pivoted first preset structure and second and predetermine structurally, broach seal structure including set up in first predetermine a plurality of cooperation grooves on the structure with set up in a plurality of cooperation structures on the structure are predetermine to the second, cooperation structure includes arch and cavity, the arch is located the cooperation inslot, just the arch with form the fit clearance between the cooperation groove, the cavity set up in protruding one side, the air current in the fit clearance can get into the cavity, and get into the air current direction of cavity with by the air current direction that the cavity flows has the contained angle.

The direction of the air flow from the cavity is towards the protrusion and/or the mating groove.

The cavity is provided with an opening facing the first preset structure, the opening comprises a first part close to the protrusion and a second part far away from the protrusion, and the air flow in the fit clearance enters the cavity along the first part and flows out of the cavity along the second part.

The molded line of the cavity comprises a straight line section and a curve section, a first end of the straight line section is connected with a first end of the curve section, a second end of the straight line section forms one end of the opening, a second end of the curve section forms the other end of the opening, and air flow in the fit clearance flows to the curve section along the straight line section.

The curve section is an arc section, the circle center of the arc section is located inside the cavity, and the straight line section is tangent to the first end of the curve section.

The angle range of the central angle of the circular arc section is 180-270 degrees.

The ratio of the height H of the projection to the radius R of the circular arc section is 1.5 to 1.

The fit clearance comprises an outflow channel, and the airflow direction of the outflow channel is parallel to the straight line section.

The protrusion is provided with a first side surface, the matching groove is provided with a first side wall, the outflow channel is formed between the first side surface and the first side wall, and the molded line of the first side surface is collinear with the linear section.

The fitting clearance further comprises an inflow channel for gas to flow into the fitting groove, the protrusion has a second side surface, the fitting groove has a second side wall, the inflow channel is formed between the second side surface and the second side wall, and the included angle between the second side surface and the first side surface ranges from 30 degrees to 60 degrees.

The cross section of the protrusion is triangular, the vertex angle of the triangle points to the inside of the matching groove, and the angle range of the vertex angle beta of the triangle is 30-60 degrees.

The ratio of the width B of the mating spacing to the height H of the projection ranges from 1 to 10 to 1.

A compressor comprises the comb tooth sealing structure.

The compressor comprises an impeller and an impeller wheel cover, wherein the impeller is provided with a plurality of matching grooves, the impeller wheel cover is provided with a plurality of matching structures, the matching structures are in the same matching structure, and the cavity is located at one side, close to the axis of the impeller, of the bulge.

The compressor comprises an impeller and a diffuser, the impeller is provided with a plurality of matching grooves, the diffuser is provided with a plurality of matching structures, the matching structures are identical, and the cavities are located on one side, away from the axis of the impeller, of the protrusions.

The invention provides a comb tooth sealing structure and a compressor, wherein a linear flow path is adjusted to be in a zigzag shape by utilizing a bulge and a matching groove, the flow direction of gas is changed to cause certain flow loss, meanwhile, after the gas flows into a cavity, the gas is equivalent to being subjected to primary throttling expansion so as to consume part of energy of the gas, most of the gas continues to flow along the inner wall of the cavity under the action of inertia, and can move along a reverse pressure gradient under the guidance of an arc-shaped structure of the inner wall, so that the collision of the flow direction is generated while kinetic energy is consumed, the turbulence degree is intensified, the energy of fluid is further consumed, a fluid pressure head is greatly reduced, and finally the fluid pressure is close to a low-pressure side through the consumption of a multi-stage matching structure and the matching groove, namely the driving force of the fluid flow is close to zero, the fluid is difficult to flow, and the purpose of preventing the gas leakage is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a comb tooth sealing structure provided in an embodiment of the present invention;

fig. 2 is another schematic structural diagram of a comb tooth sealing structure provided in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a compressor according to an embodiment of the present invention;

FIG. 4 is a schematic view of a portion of FIG. 3 at A;

FIG. 5 is a partial view of FIG. 3 at B;

in the figure:

1. a first preset structure; 2. a second preset structure; 3. a mating groove; 4. a protrusion; 5. a cavity; 6. fitting gaps; 51. an opening; 52. a straight line segment; 53. a curve segment; 31. a first side wall; 41. a first side; 32. a second side wall; 42. a second side surface; 61. an outflow channel; 62. an inflow channel; 7. an impeller; 8. an impeller shroud; 9. a diffuser.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1-5, on being applied to the first structure of predetermineeing 1 and the second of relative rotation and predetermineeing 2, broach seal structure including set up in a plurality of cooperation grooves 3 on the first structure of predetermineeing 1 with set up in a plurality of cooperation structures on the structure 2 are predetermine to the second, the cooperation structure includes arch 4 and cavity 5, arch 4 is located in the cooperation groove 3, just arch 4 with form fit clearance 6 between the cooperation groove 3, cavity 5 set up in arch 4 one side, air current in the fit clearance 6 can get into cavity 5, and get into the air current direction of cavity 5 with by the air current direction that cavity 5 flows out has the contained angle. The linear flow path is adjusted to be zigzag by the protrusion 4 and the matching groove 3, the flow direction of the gas is changed to cause certain flow loss, meanwhile, after the gas flows into the cavity 5, the gas is equivalent to a throttling expansion for one time, so that partial energy of the gas is consumed, most of the gas continues to flow along the inner wall of the cavity 5 under the action of inertia, and can move in a reverse pressure gradient under the guidance of an included angle formed by the inner wall, so that kinetic energy is consumed, meanwhile, a small part of the gas still flows along the direction from the high pressure side to the low pressure side, the gas flow flowing out of the cavity 5 basically flows from the low pressure side to the high pressure side, the flow of the gas flow and the gas flow are opposite, namely, the collision of the flow directions is generated, the degree of turbulence is increased, the energy of the fluid is further consumed, and the pressure head of the fluid is greatly reduced. Through the consumption of the multistage matching structure and the matching groove 3, the final fluid pressure is close to the low-pressure side, namely the driving force of fluid flow is close to zero, and the fluid is difficult to flow, so that the aim of preventing gas leakage is fulfilled.

The air flow from the cavity 5 is directed towards the protrusion 4 and/or the mating groove 3. That is, the air flow from the cavity 5 can obstruct the air flow from the fitting gap 6, thereby intensifying the turbulence and achieving the purpose of consuming the fluid energy.

The cavity 5 has an opening 51 facing the first default structure 1, the opening 51 comprising a first portion close to the protrusion 4 and a second portion remote from the protrusion 4, the air flow in the fitting gap 6 entering the cavity 5 along the first portion and exiting the cavity 5 along the second portion. Wherein the opening 51 is opened on the surface of the second predetermined structure 2 facing the first predetermined structure 1, the gas flowing out from the fitting gap 6 flows to the opening 51 near the protrusion 4 and enters the cavity 5, then continues to flow along the inside of the cavity 5 under the action of inertia, and finally flows out of the cavity 5 from the second part of the opening 51.

Specifically, the molded line of the cavity 5 includes a straight line segment 52 and a curved line segment 53, a first end of the straight line segment 52 is connected to a first end of the curved line segment 53, a second end of the straight line segment 52 forms one end of the opening 51, a second end of the curved line segment 53 forms the other end of the opening 51, and the air flow in the fit gap 6 flows to the curved line segment 53 along the straight line segment 52. After flowing out of the fitting gap 6, the gas is guided along the straight line segment 52 to enter the curved segment 53, the gas flows into the curved segment 53 more smoothly, and the inertia of the gas flow enables the gas to flow out from the second end of the curved segment 53, so that the direction of the gas flow is changed to intensify the turbulent flow.

The curve section 53 is an arc section, the center of the arc section is located inside the cavity 5, that is, the curve section 53 is an arc, and the change angle of the flow direction of the air flow can exceed 180 ° when the air flow passes through the curve section 53, so that the effect of conflict of the flow direction of the air flow can be generated.

The size from the circle center of the circular arc segment to the surface of the second preset structure 2 is equal to the corresponding radius of the circular arc segment. The surface of the second preset structure 2 is tangent to the second end of the arc segment, so that the direction of the airflow flowing out of the cavity is opposite to the direction of the airflow along the high-pressure side to the low-pressure side, and the blocking effect on the airflow is increased as much as possible.

Further, the straight line segment 52 is tangent to a first end of the curved line segment 53. The air flow obstruction which is possibly generated when the air flow passes through the connection part of the straight line section 52 and the curved line section 53 is reduced, and the air flow can be ensured to flow out from the second end of the curved line section 53.

Preferably, the central angle of the circular arc segment ranges from 180 ° to 270 °.

The ratio of the height H of the projection 4 to the radius R of the circular arc segment ranges from 1.5 to 1. The height H of the protrusion 4 refers to the maximum size of the protrusion 4 protruding out of the surface of the second preset structure 2, and the influence of the protrusion 4 and the cavity 5 on the air flow is ensured by limiting the height of the protrusion 4 and the radius of the arc section as much as possible under the condition of reducing the processing of the second preset structure 2.

The fitting gap 6 comprises an outlet channel 61, and the air flow direction of the outlet channel 61 is parallel to the straight line section 52. That is, the airflow flowing out of the fit clearance 6 flows along the direction tangential to the first end of the circular arc section as much as possible, so that the inertia of the gas entering the circular arc section is increased, the flow rate of the gas flowing out of the cavity 5 is increased, and the degree of turbulence and the energy consumed by the fluid are further increased.

Optionally, the protrusion 4 has a first side surface 41, the mating groove 3 has a first side wall 31, the first side surface 41 and the first side wall 31 form the outflow channel 61 therebetween, and the line of the first side surface 41 is collinear with the straight line segment 52.

The fitting gap 6 further comprises an inflow channel 62 for gas to flow into the fitting groove 3, the protrusion 4 has a second side surface 42, the fitting groove 3 has a second side wall 32, the inflow channel 62 is formed between the second side surface 42 and the second side wall 32, and the included angle between the second side surface 42 and the first side surface 41 ranges from 30 ° to 60 °. The sharp-angle-shaped flow path is used for suddenly changing the flow direction of the gas, so that certain flow loss is caused, and the blocking capacity of the gas flow is increased.

Optionally, the cross section of the protrusion 4 is triangular, a vertex angle of the triangle points into the mating groove 3, and an angle range of the vertex angle β of the triangle is 30 ° to 60 °. Preferably, the central angle is 180 ° + β.

The triangle can be a right-angled triangle, a right-angle side of the right-angled triangle is perpendicular to the surface of the second preset structure, and the hypotenuse of the right-angled triangle is tangent to the first end of the arc section.

The shape of the matching groove 3 is the same as that of the protrusion 4, so that the width B of the matching space is ensured to be the same at any position.

The ratio of the width B of the fitting space to the height H of the projection 4 ranges from 1 to 10 to 1. The influence of the projections 4 on the air flow is increased as much as possible,

as shown in fig. 3 to 5, a compressor includes the above-described comb tooth sealing structure.

In the working process of the impeller 7, gas is driven by the impeller 7 to move towards the edge of the impeller 7 through the axis of the impeller 7, a high-pressure side is formed at the edge of the impeller 7, a low-pressure side is formed at the axis of the impeller 7, the compressor comprises the impeller 7 and an impeller wheel cover 8, the impeller 7 is provided with a plurality of matching grooves 3, the impeller wheel cover 8 is provided with a plurality of matching structures, and in the same matching structure, the cavity 5 is positioned at one side of the protrusion 4 close to the axis of the impeller 7. The high-pressure side air flow at the edge of the impeller 7 flows from the gap between the impeller 7 and the impeller cover 8 to the low-pressure side at the axis of the impeller 7, so that the cavity 5 is positioned at one side of the bulge 4 close to the axis of the impeller 7, thereby limiting the possibility that the high-pressure air at the edge of the impeller 7 flows towards the axis direction of the impeller 7.

In order to improve the compression ratio, the compressor drives gas by adopting a two-stage impeller 7 mode, namely, the multistage impeller 7 and the corresponding diffuser 9 are sequentially arranged along the axial direction of the rotating shaft, when the impeller 7 is the last stage of the compressor, the back surface of the impeller 7 is communicated with the exhaust port of the compressor through a gap between the diffuser 9 and the rotating shaft, therefore, the impeller 7 is provided with a plurality of matching grooves 3, the diffuser 9 is provided with a plurality of matching structures, and in the same matching structure, the cavity 5 is positioned on one side of the bulge 4 far away from the axial direction of the impeller 7, so that the gas on the back surface of the impeller 7 is prevented from flowing from a high pressure side to a low pressure side.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. The utility model provides a broach seal structure, but is applied to relative pivoted first preset structure (1) and second and predetermine on structure (2), its characterized in that: comb tooth seal structure including set up in a plurality of cooperation grooves (3) on first predetermine structure (1) with set up in a plurality of cooperation structures on structure (2) are predetermine to the second, the cooperation structure includes protruding (4) and cavity (5), protruding (4) are located in cooperation groove (3), just protruding (4) with form fit clearance (6) between cooperation groove (3), cavity (5) set up in one side of protruding (4), the air current in fit clearance (6) can get into cavity (5), and get into the air current direction of cavity (5) with by the air current direction that cavity (5) flow has the contained angle.

2. The comb tooth sealing structure according to claim 1, characterized in that: the direction of the air flow flowing out of the cavity (5) is towards the protrusion (4) and/or the matching groove (3).

3. The comb tooth sealing structure according to claim 1, characterized in that: the cavity (5) has an opening (51) towards the first preset configuration (1), the opening (51) comprising a first portion close to the protrusion (4) and a second portion remote from the protrusion (4), the air flow within the fitting gap (6) entering the cavity (5) along the first portion and exiting the cavity (5) along the second portion.

4. The comb tooth sealing structure according to claim 3, wherein: the molded line of the cavity (5) comprises a straight line section (52) and a curved line section (53), a first end of the straight line section (52) is connected with a first end of the curved line section (53), a second end of the straight line section (52) forms one end of the opening (51), a second end of the curved line section (53) forms the other end of the opening (51), and the airflow in the matching gap (6) flows to the curved line section (53) along the straight line section (52).

5. Comb tooth sealing structure according to claim 4, characterized in that: the curve section (53) is an arc section, the circle center of the arc section is located inside the cavity (5), and the straight line section (52) is tangent to the first end of the curve section (53).

6. The comb tooth sealing structure according to claim 5, wherein: the angle range of the central angle of the circular arc section is 180-270 degrees.

7. The comb tooth sealing structure according to claim 5, wherein: the ratio of the height H of the projection (4) to the radius R of the circular arc section is in the range of 1.5 to 1.

8. Comb tooth sealing structure according to claim 4, characterized in that: the fit clearance (6) comprises an outflow channel (61), and the airflow direction of the outflow channel (61) is parallel to the straight section (52).

9. The comb tooth sealing structure according to claim 8, wherein: the protrusion (4) is provided with a first side surface (41), the matching groove (3) is provided with a first side wall (31), the first side surface (41) and the first side wall (31) form the outflow channel (61), and the molded line of the first side surface (41) is collinear with the linear section (52).

10. The comb tooth sealing structure according to claim 9, wherein: the fitting gap (6) further comprises an inflow channel (62) for gas to flow into the fitting groove (3), the protrusion (4) has a second side face (42), the fitting groove (3) has a second side wall (32), the inflow channel (62) is formed between the second side face (42) and the second side wall (32), and the second side face (42) and the first side face (41) form an included angle ranging from 30 ° to 60 °.

11. The comb tooth sealing structure according to claim 1, characterized in that: the cross section of the protrusion (4) is triangular, the vertex angle of the triangle points to the inside of the matching groove (3), and the angle range of the vertex angle beta of the triangle is 30-60 degrees.

12. The comb tooth sealing structure according to claim 1, characterized in that: the ratio of the width B of the fitting distance to the height H of the projection (4) is in the range of 1.

13. A compressor, characterized by: comprising the comb tooth sealing structure of any one of claims 1 to 12.

14. The compressor of claim 13, wherein: the compressor comprises an impeller (7) and an impeller wheel cover (8), wherein the impeller (7) is provided with a plurality of matching grooves (3), the impeller wheel cover (8) is provided with a plurality of matching structures, the matching structures are identical to each other, and the cavity (5) is located on one side, close to the axis of the impeller (7), of the protrusion (4).

15. The compressor of claim 13, wherein: the compressor comprises an impeller (7) and a diffuser (9), wherein the impeller (7) is provided with a plurality of matching grooves (3), the diffuser (9) is provided with a plurality of matching structures, the matching structures are identical to the matching structures, and the cavities (5) are located on one sides, away from the protrusions (4), of the axis of the impeller (7).