Sealing assembly of double-screw rotor and double-screw machine

Abstract

The utility model discloses a sealing assembly of a double-screw rotor and a double-screw machine, the sealing assembly of the double-screw rotor comprises a sealing seat, a first sealing ring, a second sealing ring, a first elastic piece and a second elastic piece, the first sealing ring and the second sealing ring are distributed in the sealing seat front and back, the first sealing ring is used for sealing oil, the second sealing ring is used for sealing oil, and the second sealing ring is used for sealing oil. The first sealing ring is used for sealing oil, the second sealing ring is used for sealing air, the first sealing ring is installed in the sealing seat in a limited mode through a first elastic piece, the second sealing ring is installed in the sealing seat in a limited mode through a second elastic piece, and the sealing assembly conducts oil sealing on the bearing end through the first sealing ring and conducts air sealing on the rotor end through the second sealing ring. Sealing is efficient, performance is reliable, the number of parts of the sealing assembly is small, the structure is simple, the installation process is simplified, and assembling is more labor-saving.

Description

Technical Field

[0001] The present application relates to the technical field of gas compression devices, and more specifically to a sealing assembly for a twin-screw rotor and a twin-screw machine. Background Art

[0002] A twin-screw machine is a mechanical device used to compress gas to increase gas pressure or transport gas. The twin-screw machine includes a twin-screw compressor, a twin-screw vacuum pump, and a twin-screw expander, and has advantages such as high reliability, convenient operation and maintenance, good dynamic balance, and strong adaptability. A pair of mutually meshing screw rotors are arranged in parallel in the body of the twin-screw machine. During the meshing rotation of the twin-screw rotors, a periodically changing working chamber volume is formed to realize the processes of entry, expansion / compression / vacuum pumping, and discharge of the working medium, achieve efficient conversion of the working medium, convert the internal energy of the working medium into mechanical energy, and is applicable to asynchronous or synchronous double-rotation motion. For an oil-free twin-screw machine, in order to ensure the oil-free state of the compression chamber, a sealing structure needs to be used for isolation to separate the compression medium and lubricating oil, and prevent the compression medium from being contaminated by the lubricating oil. However, the existing sealing structure is complex. During the continuous compression of air in the body during operation, the temperature in the body will rise rapidly, and the sealing structure is prone to failure, unable to completely isolate the medium gas and the oil liquid. Moreover, the sealing structure of the traditional screw rotor has a large number of parts, it is difficult to guarantee the precision, and there are many vulnerable parts. These factors all limit the performance and reliability of the sealing structure. Summary of the Invention

[0003] The technical problem to be solved by the present application is to provide a sealing assembly for a twin-screw rotor and a twin-screw machine. The sealing assembly is installed on the twin-screw rotor, has a simple structure, simplifies the installation process, is labor-saving in assembly, and has reliable sealing performance.

[0004] The present application provides a sealing assembly for a twin-screw rotor, which includes a sealing seat, a first sealing ring, a second sealing ring, a first elastic member, and a second elastic member. The first sealing ring and the second sealing ring are distributed front and back in the sealing seat. The first sealing ring is used for sealing oil, and the second sealing ring is used for sealing gas. The first sealing ring is installed in the sealing seat in a position-limiting manner through the first elastic member, and the second sealing ring is installed in the sealing seat in a position-limiting manner through the second elastic member. In this technical solution, a bearing assembly is arranged on the shaft section of the twin-screw rotor. The twin-screw rotor is supported by the bearing assembly to reduce friction and make the rotation smoother. Among them, the sealing assembly is sleeved on the shaft section of the twin-screw rotor and is located inside the bearing assembly. The sealing assembly can achieve gas sealing at the rotor end and oil sealing at the bearing end. The sealing assembly installs the first sealing ring and the second sealing ring through the sealing seat. The first sealing ring and the second sealing ring are respectively installed in the sealing seat in a position-limiting manner through the first elastic member and the second elastic member, making the installation of the first sealing ring and the second sealing ring simple and reliable. The first sealing ring is installed on the side of the sealing seat close to the bearing assembly, and the second sealing ring is installed on the side of the sealing seat close to the rotor end. The sealing assembly seals the oil at the bearing end through the first sealing ring and seals the gas at the rotor end through the second sealing ring. The sealing is efficient and the performance is reliable. The outer ring of the sealing seat can be connected and fixed to the outer housing by gluing, thereby forming a firm sealing structure. The assembly is simpler and more reliable. Moreover, the sealing assembly has fewer components and a simple structure, simplifies the installation process, and makes the assembly more labor-saving.

[0005] As an improvement, an O-ring is installed between the outer wall of the first sealing ring and the inner wall of the sealing seat. In this technical solution, by installing an O-ring between the first sealing ring and the sealing seat, the first sealing ring is installed on the sealing seat in a position-limiting manner through the cooperation of the O-ring and the first elastic member, improving the installation reliability. Moreover, the cooperation between the O-ring and the first sealing ring can improve the sealing effect of the sealing assembly, and the sealing performance is more reliable.

[0006] As an improvement, a first groove adapted to the first sealing ring is provided in the sealing seat. The first sealing ring and the O-ring are both installed in the first groove. A second groove adapted to the second sealing ring is provided in the sealing seat, and the second sealing ring is installed in the second groove. In this technical solution, by respectively providing the first groove and the second groove in the sealing seat, the first sealing ring and the second sealing ring are both installed in the sealing seat in an embedded manner. The installation structure is simple and reliable, and the sealing performance is better.

[0007] As an improvement, the first elastic member is an open corrugated spring, and the second elastic member is a closed corrugated spring. In this technical solution, both the first elastic member and the second elastic member are corrugated springs. Corrugated springs have the advantages of small installation space, high strength, good flexibility, strong impact resistance, noise reduction and vibration reduction. The first elastic member is set as an open corrugated spring, which refers to a type with an opening designed in the corrugated spring and can relieve deformation, making the deformation of the corrugated spring more uniform. The second elastic member is set as a closed corrugated spring, which refers to a type without an opening designed in the corrugated spring and has a simpler manufacturing process and lower cost.

[0008] As an improvement, both the first sealing ring and the second sealing ring are stainless steel sealing rings. In this technical solution, sealing rings made of stainless steel are used. Stainless steel sealing rings have the advantages of good corrosion resistance, high temperature resistance, wear resistance and sealing performance.

[0009] As an improvement, a plurality of sealing channels are provided on the inner wall of the first sealing ring. In this technical solution, by designing a plurality of sealing channels in the first sealing ring, the sealing effect of the first sealing ring is improved.

[0010] As an improvement, the sealing channels are spiral; at least 5 sealing channels are provided. In this technical solution, a plurality of sealing channels are arranged in a spiral shape on the inner wall of the first sealing ring, and the sealing effect of the spiral sealing channels is better; at least 5 sealing channels are provided to improve the sealing effect and durability of the first sealing ring.

[0011] As an improvement, an air leakage port and an oil leakage port are provided between the sealing seat and the first sealing ring and the second sealing ring, and the air leakage port and the oil leakage port are arranged vertically. In this technical solution, an air leakage port and an oil leakage port arranged vertically are respectively provided on the sealing seat. The gas is discharged through the air leakage port located above, and the oil is discharged through the oil leakage port located below, avoiding affecting the sealing performance of the sealing component and making it more reliable to use.

[0012] As an improvement, the oil leakage port is composed of a plurality of through holes, and the plurality of through holes are evenly distributed along a straight line. In this technical solution, the oil leakage port is composed of a plurality of through holes evenly distributed along a straight line, and the oil leakage is more uniform and rapid.

[0013] The present application can also provide a twin-screw machine, including the sealing assembly of any one of the aforementioned twin-screw rotors. In this technical solution, the twin-screw machine selects a twin-screw compressor, a twin-screw vacuum pump or a twin-screw expander. The twin-screw compressor or the twin-screw expander has the advantages of high reliability, convenient operation and maintenance, good dynamic balance, strong adaptability, etc. And a pair of mutually meshing screw rotors are arranged in parallel in the body of the twin-screw machine. Bearing assemblies are installed on the screw rotors to support the twin-screw rotors, reduce friction and make the rotation smoother. The sealing assembly is sleeved on the shaft section of the twin-screw rotor and is located inside the bearing assembly. The sealing assembly can achieve air sealing at the rotor end and oil sealing at the bearing end. The sealing assembly is installed by bonding the sealing seat to the outer shell. The sealing assembly has fewer parts and a simple structure, simplifies the installation process, and makes the assembly more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a schematic perspective view of the sealing assembly of a twin-screw rotor of the present application.

[0015] Figure 2 FIG. is an exploded view of the sealing assembly of a twin-screw rotor of the present application.

[0016] Figure 3 FIG. is a partial cross-sectional view of a screw machine of the present application.

[0017] Figure 4 For the present application Figure 3 FIG. is a partially enlarged schematic view of part A in

[0018] As shown in the figure: 1. Sealing seat; 11. First groove; 12. Second groove; 13. Air leakage port; 14. Oil leakage port; 2. First sealing ring; 21. Sealing channel; 3. Second sealing ring; 4. First elastic member; 5. Second elastic member; 6. O-ring; 7. Twin-screw rotor; 8. Bearing assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To better understand the present application, more detailed descriptions will be made for various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0020] In the drawings, for the sake of clarity, the thickness, dimensions and shapes of the objects have been slightly exaggerated. The drawings are only examples and are not drawn to scale strictly.

[0021] It should also be understood that the terms "comprise", "comprises", "include", "includes", "have", "has", "contain", and "contains", when used in this specification, denote the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. The terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements, or components. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0022] In addition, it should be noted that the terms "install", "set", "provide", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements, or components; it may be directly provided on another component or there may be another intermediate component present at the same time. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are only for the purpose of illustration. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the specification of this invention are only for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] Such as Figures 1 to 4As shown, the present application discloses a sealing assembly for a twin-screw rotor. A bearing assembly 8 is arranged on the shaft section of the twin-screw rotor 7. The twin-screw rotor 7 is supported by the bearing assembly 8 to reduce friction and make the rotation smoother. Among them, the sealing assembly is sleeved on the shaft section of the twin-screw rotor 7 and is located inside the bearing assembly 8. The sealing assembly can achieve air sealing at the rotor end and oil sealing at the bearing end; the sealing assembly includes a sealing seat 1, a first sealing ring 2, a second sealing ring 3, a first elastic member 4 and a second elastic member 5. The first sealing ring 2 and the second sealing ring 3 are distributed front and back in the sealing seat 1. The first sealing ring 2 is used for oil sealing, and the second sealing ring 3 is used for air sealing. The first sealing ring 2 is limited and installed in the sealing seat 1 through the first elastic member 4, and the second sealing ring 3 is limited and installed in the sealing seat 1 through the second elastic member 5. The sealing assembly installs the first sealing ring 2 and the second sealing ring 3 through the sealing seat 1. The first sealing ring 2 and the second sealing ring 3 are respectively limited and installed in the sealing seat 1 through the first elastic member 4 and the second elastic member 5, making the installation of the first sealing ring 2 and the second sealing ring 3 simple and reliable. The first sealing ring 2 is installed on one side of the sealing seat 1 close to the rotor end, and the second sealing ring 3 is installed on one side of the sealing seat 1 close to the bearing assembly 8. The sealing assembly seals the oil at the bearing end through the first sealing ring 2 and seals the air at the rotor end through the second sealing ring 3. The sealing is efficient and the performance is reliable. The outer ring of the sealing seat 1 can be connected and fixed to the outer housing by gluing, thus forming a firm sealing structure. The assembly is simpler and more reliable. Moreover, the sealing assembly has fewer components and a simple structure, simplifies the installation process, and makes the assembly more labor-saving.

[0024] More specifically, an O-ring 6 is installed between the outer wall of the first sealing ring 2 and the inner wall of the sealing seat 1. By installing the O-ring 6 between the first sealing ring 2 and the sealing seat 1, the first sealing ring 2 is limited and installed on the sealing seat 1 through the cooperation of the O-ring 6 and the first elastic member 4, improving the installation reliability. And the cooperation of the O-ring 6 and the first sealing ring 2 can improve the sealing effect of the sealing assembly, and the sealing performance is more reliable.

[0025] More specifically, a first groove 11 adapted to the first sealing ring 2 is provided in the sealing seat 1. The first sealing ring 2 and the O-ring 6 are both installed in the first groove 11. A second groove 12 adapted to the second sealing ring 3 is provided in the sealing seat 1. The second sealing ring 3 is installed in the second groove 12. By respectively providing the first groove 11 and the second groove 12 in the sealing seat 1, the first sealing ring 2 and the second sealing ring 3 are both installed in the sealing seat 1 in an embedded manner, and the installation structure is simple and reliable, and the sealing performance is better.

[0026] More specifically, the first elastic member 4 is an open wave spring, and the second elastic member 5 is a closed wave spring. Both the first elastic member 4 and the second elastic member 5 are wave springs. Wave springs have the advantages of small installation space, high strength, good flexibility, strong impact resistance, noise reduction, and vibration reduction. The first elastic member 4 is set as an open wave spring, which refers to a type with an opening designed in the wave spring and can play a role in relieving deformation, making the deformation of the wave spring more uniform. The second elastic member 5 is set as a closed wave spring, which refers to a type without an opening designed in the wave spring and has a simpler manufacturing process and lower cost.

[0027] More specifically, both the first sealing ring 2 and the second sealing ring 3 are stainless steel sealing rings. The sealing rings made of stainless steel have the advantages of good corrosion resistance, high temperature resistance, wear resistance, and sealing performance.

[0028] More specifically, a plurality of sealing channels 21 are provided on the inner wall of the first sealing ring 2. By designing a plurality of sealing channels 21 in the first sealing ring 2, the sealing effect of the first sealing ring 2 is improved; the sealing channels 21 are spiral. A plurality of sealing channels 21 are arranged spirally on the inner wall of the first sealing ring 2, and the sealing effect of the spiral sealing channels 21 is better; at least 5 sealing channels 21 are provided to improve the sealing effect and durability of the first sealing ring 2.

[0029] More specifically, an air leakage port 13 and an oil leakage port 14 are provided between the sealing seat 1 and the first sealing ring 2 and the second sealing ring 3. The air leakage port 13 and the oil leakage port 14 are distributed vertically. The vertically distributed air leakage port 13 and oil leakage port 14 are respectively provided on the sealing seat 1. The gas is discharged through the upper air leakage port 13, and the oil is discharged through the lower oil leakage port 14, avoiding affecting the sealing performance of the sealing component and making it more reliable to use; more specifically, the oil leakage port 14 is composed of a plurality of through holes, and the plurality of through holes are evenly distributed along a straight line. The oil leakage port 14 is composed of a plurality of through holes evenly distributed along a straight line, and the oil leakage is more uniform and rapid.

[0030] This specific implementation manner can also provide a twin-screw machine, including the aforementioned sealing assembly. The twin-screw machine can be a twin-screw compressor, a twin-screw vacuum pump, or a twin-screw expander. The twin-screw compressor or the twin-screw expander has the advantages of high reliability, convenient operation and maintenance, good dynamic balance, and strong adaptability. And a pair of mutually meshing screw rotors are arranged in parallel in the body of the twin-screw machine. A bearing assembly 8 is installed on the twin-screw rotor 7, and the twin-screw rotor 7 is supported by the bearing assembly 8 to reduce friction and make the rotation smoother. The sealing assembly is sleeved on the shaft section of the twin-screw rotor 7 and is located inside the bearing assembly 8. The sealing assembly can achieve air sealing at the rotor end and oil sealing at the bearing end. The sealing assembly is installed by bonding the sealing seat 1 to the outer housing. The sealing assembly has fewer components and a simple structure, simplifies the installation process, and makes the assembly more labor-saving.

[0031] This application is not limited to the above best implementation manner. Anyone can obtain other various forms of products under the inspiration of this application. However, no matter what changes are made in its shape or structure, as long as it has the same or similar technical solutions as this application, they all fall within the protection scope of this application.

Claims

1. A sealing assembly for a twin-screw rotor, characterized in that, It includes a sealing seat (1), a first sealing ring (2), a second sealing ring (3), a first elastic member (4) and a second elastic member (5). The first sealing ring (2) and the second sealing ring (3) are distributed front and back in the sealing seat (1). The first sealing ring (2) is used for sealing oil, and the second sealing ring (3) is used for sealing gas. The first sealing ring (2) is limited and installed in the sealing seat (1) through the first elastic member (4), and the second sealing ring (3) is limited and installed in the sealing seat (1) through the second elastic member (5).

2. The sealing assembly of a twin-screw rotor according to claim 1, characterized in that, An O-ring (6) is installed between the outer wall of the first sealing ring (2) and the inner wall of the sealing seat (1).

3. The sealing assembly of a twin-screw rotor according to claim 2, characterized in that, A first groove (11) adapted to the first sealing ring (2) is provided in the sealing seat (1). The first sealing ring (2) and the O-ring (6) are both installed in the first groove (11). A second groove (12) adapted to the second sealing ring (3) is provided in the sealing seat (1), and the second sealing ring (3) is installed in the second groove (12).

4. The sealing assembly of a twin-screw rotor according to claim 1, characterized in that, The first elastic member (4) is an open wave spring, and the second elastic member (5) is a closed wave spring.

5. The sealing assembly of a twin-screw rotor according to claim 1, characterized in that, Both the first sealing ring (2) and the second sealing ring (3) are stainless steel sealing rings.

6. The sealing assembly of a twin-screw rotor according to claim 5, characterized in that, A plurality of sealing channels (21) are provided on the inner wall of the first sealing ring (2).

7. The sealing assembly of a twin-screw rotor according to claim 6, wherein, The sealing channels (21) are helical; at least 5 sealing channels (21) are provided.

8. The sealing assembly of a twin-screw rotor according to claim 1, characterized in that, An air leakage port (13) and an oil leakage port (14) are provided between the first sealing ring (2) and the second sealing ring (3) in the sealing seat (1), and the air leakage port (13) and the oil leakage port (14) are distributed vertically.

9. The sealing assembly of a twin-screw rotor according to claim 8, characterized in that, The oil leakage port (14) is composed of a plurality of through holes, and the plurality of through holes are evenly distributed in a straight line.

10. A twin-screw machine, characterized in that, It includes a sealing assembly of a twin-screw rotor according to any one of claims 1-9.

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