Rotor of screw machine and screw machine

Abstract

The utility model discloses a rotor of a screw machine and the screw machine, the rotor of the screw machine comprises a rotating shaft and a spiral working part arranged on the rotating shaft, the spiral working part is provided with a plurality of dynamic balance holes, the spiral working part is provided with a sealing plug body matched with the dynamic balance holes, and the sealing plug body is arranged on the rotating shaft. The sealing plug body is installed at an opening of the dynamic balance hole to close the dynamic balance hole, the dynamic balance hole is connected with the internal thread and the external thread of the sealing plug body to limit the sealing plug body at the opening of the dynamic balance hole, and the sealing plug body is additionally arranged to block the dynamic balance hole, so that airflow disturbance caused by the dynamic balance hole can be avoided; therefore, noise and vibration of the whole machine are reduced, the sealing plug body can isolate liquid and solid, and the service life of the screw rotor is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of compression devices, and more specifically to a rotor of a screw machine and a 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 and a twin-screw expander. It has the advantages of high reliability, convenient operation and maintenance, good dynamic balance, strong adaptability, etc. A pair of mutually meshing screw rotors are arranged in parallel in the body of the twin-screw machine. One end of the screw rotor is the suction end, which is connected to the suction port of the body, and the other end of the screw rotor is the exhaust end, which is connected to the exhaust port of the body. As the screw rotor rotates, the gas is sucked in from the suction end and discharged from the exhaust end after compression, thereby completing the gas compression process. In the manufacturing process, affected by factors such as design and process errors, the assembled screw rotor group often has the problem of the center of mass deviating from its rotation axis. Small eccentricity will cause a large vibration during the high-speed rotation of the screw rotor group. Therefore, it is necessary to adjust the center of mass of the screw rotor group, which is usually called the dynamic balance of the screw rotor. The existing dynamic balancing method of the screw rotor is mostly to drill a balancing hole on the rotor. The setting of the balancing hole greatly reduces the imbalance of the screw rotor group during the assembly process. For example, the utility model patent with publication number: CN204692097U discloses an anti-corrosion dry screw vacuum pump rotor, which includes a rotating shaft and spiral blades made of stainless steel, titanium alloy or Hastelloy, wherein the spiral blades are wound around the rotating shaft and are an integral structure with the rotating shaft; a balancing hole is provided on the spiral blades; in this technical scheme, the dynamic balance of the screw rotor group is achieved through the balancing hole, but the balancing hole will cause airflow disturbance and increase the noise and vibration of the whole machine. On the other hand, liquid and solid are easily accumulated in the balancing hole. Excessive accumulation of liquid will cause corrosion, while excessive accumulation of solid will increase the mass of the rotor, thereby increasing the imbalance and causing the vibration of the screw rotor to exceed the standard. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a rotor of a screw machine and a screw machine. The rotor of the screw machine can avoid the airflow disturbance caused by the dynamic balancing hole by adding a sealing plug body to block the dynamic balancing hole, thereby reducing the noise and vibration of the whole machine, and the sealing plug body can isolate liquids and solids, thereby increasing the service life of the screw rotor.

[0004] The present application provides a rotor of a screw machine, comprising a rotating shaft and a spiral working part arranged on the rotating shaft, the spiral working part is provided with a dynamic balancing hole, and there are a plurality of dynamic balancing holes. A sealing plug body adapted to the dynamic balancing hole is installed on the spiral working part, and the sealing plug body is installed at the opening of the dynamic balancing hole to close the dynamic balancing hole. The dynamic balancing hole is connected to the sealing plug body through internal and external threads to limit the sealing plug body at the opening of the dynamic balancing hole.

[0005] In this technical solution, the screw rotor will rotate at high speed during the operation of the screw machine. By arranging a dynamic balancing hole on the spiral working part of the screw rotor, the dynamic balancing hole can reduce the imbalance during the high-speed rotation of the screw rotor. However, the dynamic balancing hole will cause air flow disturbance during the high-speed rotation of the screw rotor, increase the noise and vibration of the whole machine, and liquid and solid are likely to accumulate in the dynamic balancing hole, which is likely to cause corrosion and mass increase in the screw rotor. In this solution, a sealing plug body adapted to the dynamic balancing hole is added, and the sealing plug body is installed at the opening of the dynamic balancing hole. The sealing plug body can close the dynamic balancing hole. The dynamic balancing hole is avoided from causing air flow disturbance, and the noise and vibration of the whole machine operation are reduced. The sealing plug body can isolate liquid and solid from entering the dynamic balancing hole, and avoid liquid and solid deposition in the dynamic balancing hole. The liquid is prevented from corroding the dynamic balancing hole and the solid from increasing the mass of the screw rotor, thereby reducing the imbalance during high-speed rotation of the screw rotor, reducing the vibration of the screw rotor, and increasing the service life of the screw rotor. On the other hand, the present scheme arranges internal and external threaded connection between the dynamic balancing hole and the sealing plug body, and the sealing plug body is detachably connected to the dynamic balancing hole to meet more usage requirements, and the threaded disassembly and assembly method is simple, labor-saving and reliable.

[0006] As an improvement, the sealing plug body is provided with an external thread, and the opening of the dynamic balancing hole is provided with an internal thread adapted to the external thread, and the external thread cooperates with the internal thread so that the dynamic balancing hole and the sealing plug body are threadedly connected. In this technical solution, by providing an external thread on the sealing plug body and an internal thread at the opening of the dynamic balancing hole, the sealing plug body can be twisted into the dynamic balancing hole and limited, and the installation structure is simple and reliable.

[0007] As an improvement, the sealing plug body is made of special plastic material. In this technical solution, the sealing plug body is made of special plastic with low density and corrosion resistance. The sealing plug body is installed at the opening of the dynamic balancing hole without affecting the quality of the entire screw rotor, and the sealing plug body has good corrosion resistance and can extend its service life.

[0008] As an improvement, the material of the sealing plug body is PEEK or PTFE. In this technical solution, the sealing plug body is made of PEEK (polyetheretherketone) or PTFE (polytetrafluoroethylene) materials in special plastics. PEEK (polyetheretherketone) or PTFE (polytetrafluoroethylene) are two common high-performance engineering plastics. PEEK can withstand a temperature of about 250 degrees Celsius for a long time, and PTFE can withstand a temperature of 260 degrees Celsius for a long time. Therefore, both PEEK and PTFE have good thermal stability. PEEK and PTFE also have good strength, rigidity, wear resistance and low friction coefficient. On the other hand, PEEK and PTFE have good chemical resistance and corrosion resistance in common solvents and chemicals, and have strong resistance to chemical substances such as acids and alkalis.

[0009] As an improvement, the sealing plug body is an integrally formed structure. In the present technical solution, the sealing plug body is used to close the dynamic balancing hole, and the sealing plug body is set as an integrally formed structure, which makes production and assembly simpler and more reliable.

[0010] As an improvement, the top surface of the sealing plug body is provided with a slotted groove. In the present technical solution, the sealing plug body is connected to the dynamic balancing hole through internal and external threads, and a slotted groove is provided on the top surface of the sealing plug body so as to be adapted for use with a slotted screwdriver. The head of the slotted screwdriver is in a slotted shape, which can better fit the slotted groove on the top surface of the sealing plug body, thereby avoiding sliding and wear of the sealing plug body. The sealing plug body is screwed into the dynamic balancing hole more labor-saving and conveniently, and the slotted groove is provided so that the sealing plug body can be completely screwed into the dynamic balancing hole, and the top surface of the sealing plug body is flush with the end surface of the spiral working part, and the overall matching effect is better.

[0011] As an improvement, the sealing plug body is a cylindrical structure. In this technical solution, the dynamic balancing hole is a long circular hole structure, and the sealing plug only needs to close the opening of the dynamic balancing hole. The sealing plug body is set to a cylindrical structure, and the sealing plug body is more adapted to the dynamic balancing hole, so that the sealing performance is better.

[0012] The present application may also provide a screw machine, including any of the aforementioned screw machine rotors. In the present technical solution, the screw machine is a mechanical device that compresses gas to increase gas pressure or transport gas by rotating a screw rotor, and the screw rotor of the screw machine is provided with a dynamic balancing hole to reduce the imbalance, and the dynamic balancing hole is closed by adding a sealing plug body adapted to the dynamic balancing hole, thereby reducing the noise and vibration of the whole machine operation, and avoiding the deposition of liquid and solid in the dynamic balancing hole, thereby increasing the service life of the screw rotor and reducing the noise and vibration of the whole machine operation.

[0013] As an improvement, the screw machine is a twin-screw compressor or a twin-screw expander. In this technical solution, the screw machine is a twin-screw compressor or a twin-screw expander, which has the advantages of high reliability, convenient operation and maintenance, good power balance, strong adaptability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of a rotor of a screw machine in the present application.

[0015] Figure 2 This is a schematic diagram of the exploded structure of a rotor of a screw machine in the present application.

[0016] Figure 3 For this application Figure 2 A local enlarged schematic diagram of point A in the middle.

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the sealing plug body in this application.

[0018] As shown in the figure: 1. rotating shaft; 2. spiral working part; 21. dynamic balancing hole; 211. internal thread; 3. sealing plug body; 31. external thread; 32. slot. DETAILED DESCRIPTION

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

[0020] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0021] It should also be understood that the terms “comprises,” “including,” “has,” “contains,” and “comprising,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0022] Embodiment 1

[0023] like Figures 1 to 4As shown, the present application discloses a rotor of a screw machine, comprising a rotating shaft 1 and a spiral working part 2 arranged on the rotating shaft 1, wherein the spiral working part 2 is provided with a dynamic balancing hole 21, and the dynamic balancing hole 21 is provided with a plurality of dynamic balancing holes. During the operation of the screw machine, the screw rotor rotates at a high speed. By providing the dynamic balancing hole 21 on the spiral working part 2 of the screw rotor, the dynamic balancing hole 21 can reduce the unbalance amount during the high-speed rotation of the screw rotor. However, the dynamic balancing hole 21 will cause air flow disturbance during the high-speed rotation of the screw rotor, increase the noise and vibration of the whole machine, and liquid and solid are easily accumulated in the dynamic balancing hole 21, which is easy to cause corrosion and mass increase in the screw rotor.

[0024] A sealing plug body 3 adapted to the dynamic balancing hole 21 is installed on the spiral working part 2. The sealing plug body 3 is installed at the opening of the dynamic balancing hole 21 to close the dynamic balancing hole 21. The dynamic balancing hole 21 is connected to the internal and external threads 31 of the sealing plug body 3 to limit the sealing plug body 3 at the opening of the dynamic balancing hole 21. In this solution, a sealing plug body 3 adapted to the dynamic balancing hole 21 is added. The sealing plug body 3 is installed at the opening of the dynamic balancing hole 21. The sealing plug body 3 can close the dynamic balancing hole 21, thereby avoiding airflow disturbance in the dynamic balancing hole 21 and reducing the noise and vibration of the whole machine operation. The dynamic balancing hole 21 is dynamic, and the sealing plug body 3 can isolate the liquid and solid from entering the dynamic balancing hole 21, avoid the liquid and solid deposition in the dynamic balancing hole 21, prevent the liquid from corroding the dynamic balancing hole 21, and the solid increases the mass of the screw rotor, thereby reducing the imbalance amount during the high-speed rotation of the screw rotor, reducing the vibration of the screw rotor, and increasing the service life of the screw rotor. On the other hand, the present solution arranges the dynamic balancing hole 21 to be connected with the internal and external threads 31 of the sealing plug body 3, and the sealing plug body 3 is detachably connected to the dynamic balancing hole 21 to meet more usage requirements, and the threaded disassembly and assembly method is simple, labor-saving and reliable.

[0025] More specifically, Figure 2 and Figure 3 As shown, the sealing plug body 3 is provided with an external thread 31, and the opening of the dynamic balancing hole 21 is provided with an internal thread 211 adapted to the external thread 31. The external thread 31 cooperates with the internal thread 211 so that the dynamic balancing hole 21 and the sealing plug body 3 are threadedly connected. By providing the external thread 31 on the sealing plug body 3 and the internal thread 211 at the opening of the dynamic balancing hole 21, the sealing plug body 3 can be twisted into the dynamic balancing hole 21 and limited, and the installation structure is simple and reliable.

[0026] More specifically, the sealing plug body 3 is made of special plastic material. The sealing plug body 3 is made of special plastic with low density and corrosion resistance. The sealing plug body 3 is installed at the opening of the dynamic balancing hole 21 without affecting the quality of the entire screw rotor. The sealing plug body 3 has good corrosion resistance and can extend its service life.

[0027] More specifically, the sealing plug body 3 is made of PEEK or PTFE. The sealing plug body 3 is made of PEEK (polyetheretherketone) or PTFE (polytetrafluoroethylene) material among special plastics. PEEK (polyetheretherketone) or PTFE (polytetrafluoroethylene) are two common high-performance engineering plastics. PEEK can withstand a temperature of about 250 degrees Celsius for a long time, and PTFE can withstand a temperature of 260 degrees Celsius for a long time. Therefore, both PEEK and PTFE have good thermal stability. PEEK and PTFE also have good strength, rigidity, wear resistance and low friction coefficient. On the other hand, PEEK and PTFE have good chemical resistance and corrosion resistance in common solvents and chemicals, and have strong resistance to chemical substances such as acids and alkalis.

[0028] More specifically, Figure 4 As shown, the sealing plug body 3 is an integrally formed structure, and the sealing plug body 3 is used to close the dynamic balancing hole 21. The sealing plug body 3 is an integrally formed structure, and the production and assembly are simpler and more reliable. The sealing plug body 3 is a cylindrical structure, and the dynamic balancing hole 21 is a long circular hole structure. The sealing plug only needs to close the opening of the dynamic balancing hole 21. The sealing plug body 3 is set to a cylindrical structure, and the sealing plug body 3 is more adapted to the dynamic balancing hole 21, thereby having a better sealing property.

[0029] More specifically, Figure 4 As shown, a slot 32 is provided on the top surface of the sealing plug body 3, and the sealing plug body 3 is connected to the dynamic balancing hole 21 by internal and external threads 31. By providing the slot 32 on the top surface of the sealing plug body 3 so as to be adaptable to a slotted screwdriver, the head of the slotted screwdriver is in a slotted shape, which can better fit the slot 32 on the top surface of the sealing plug body 3, thereby avoiding sliding and wear of the sealing plug body 3, and screwing the sealing plug body 3 into the dynamic balancing hole 21 is more labor-saving and convenient, and by providing the slotted groove 32, the sealing plug body 3 can be completely screwed into the dynamic balancing hole 21, and the top surface of the sealing plug body 3 is flush with the end surface of the spiral working part 2, and the overall matching effect is better.

[0030] Embodiment 2

[0031] like Figures 1 to 4 As shown, this embodiment provides a screw machine based on the first embodiment, including a rotor of a screw machine provided in the first embodiment. The screw machine is a mechanical device that uses the rotation of a screw rotor to compress gas to increase gas pressure or transport gas. The screw rotor of the screw machine is provided with a dynamic balancing hole 21 to reduce the imbalance. The dynamic balancing hole 21 is closed by adding a sealing plug body 3 that is adapted to the dynamic balancing hole 21, thereby reducing the noise and vibration of the whole machine operation, and avoiding the deposition of liquid and solid in the dynamic balancing hole 21, thereby increasing the service life of the screw rotor and reducing the noise and vibration of the whole machine operation.

[0032] More specifically, the screw machine is a twin-screw compressor or a twin-screw expander. The screw machine uses a twin-screw compressor 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 power balance, and strong adaptability.

[0033] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A rotor for a screw machine, comprising a rotating shaft (1) and a spiral working part (2) arranged on the rotating shaft (1), characterized in that: The spiral working part (2) is provided with a dynamic balancing hole (21), and the dynamic balancing hole (21) is provided with a plurality of them. The spiral working part (2) is installed with a sealing plug body (3) adapted to the dynamic balancing hole (21), and the sealing plug body (3) is installed at the opening of the dynamic balancing hole (21) to close the dynamic balancing hole (21). The dynamic balancing hole (21) is connected to the sealing plug body (3) by internal and external threads (31) to limit the sealing plug body (3) at the opening of the dynamic balancing hole (21).

2. A rotor for a screw machine according to claim 1, characterized in that: The sealing plug body (3) is provided with an external thread (31), and the opening of the dynamic balancing hole (21) is provided with an internal thread (211) adapted to the external thread (31). The external thread (31) cooperates with the internal thread (211) to threadably connect the dynamic balancing hole (21) and the sealing plug body (3).

3. The rotor of a screw machine according to claim 1, characterized in that: The sealing plug body (3) is made of special plastic material.

4. A rotor for a screw machine according to claim 1 or 3, characterized in that: The sealing plug body (3) is made of PEEK or PTFE.

5. The rotor of a screw machine according to claim 1, characterized in that: The sealing plug body (3) is an integrally formed structure.

6. The rotor of a screw machine according to claim 1, characterized in that: The top surface of the sealing plug body (3) is provided with a straight groove (32).

7. The rotor of a screw machine according to claim 1, characterized in that: The sealing plug body (3) is of cylindrical structure.

8. A screw machine, characterized in that: A rotor for a screw machine comprising any one of claims 1-7.

9. A screw machine according to claim 8, characterized in that: The screw machine is a twin-screw compressor or a twin-screw expander.

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