CO centrifugal compressor structure

Abstract

The utility model relates to the technical field of compressors, and discloses a CO centrifugal compressor structure which comprises a compressor cylinder body, an inner shell assembly is arranged in the compressor cylinder body, one side of a driver of the compressor cylinder body is a barrel bottom, the free end of the compressor cylinder body serves as a barrel opening to be opened, and the inner shell assembly is a barrel-shaped assembly which is inserted from the free end. A limiter is arranged on the upper portion of the inner wall of the compressor cylinder body, the position of the inner shell assembly is determined through the limiter, the inner shell assembly is provided with an inlet volute chamber at one end of the horizontal split type partition plate, and the middle of the inlet volute chamber is fixedly connected with a motor. A sealing system in a compressor cylinder body is adjusted, the interference magnitude, the loosening rotating speed and the strength of impeller assembly are subjected to finite element analysis, the working rotating speed and the critical rotating speed of a rotor guarantee enough isolation margin, high-precision machining is conducted on the inner surface of an impeller, namely, the impeller is machined from an impeller cover to blades through a numerical control machine tool, the surface smoothness is high, and the machining precision is high. And the loss in the gas flowing process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a CO centrifugal compressor structure. Background Art

[0002] A centrifugal compressor is a type of compressor that uses centrifugal force to convert the kinetic energy of gas into pressure energy, thereby pressurizing and transporting the gas. It is an important equipment widely used in industrial production. It has the advantages of high efficiency, stability, and reliability, and is therefore widely used in the chemical, petroleum, electric power and other fields.

[0003] Centrifugal compressors have large pressure fluctuations and require additional control and adjustment to ensure their stability. Surge is an inherent characteristic of centrifugal compressors. When the intake volume decreases to a certain value, surge will occur, which is extremely harmful to the machine and may cause increased vibration and even trigger safety-related incidents. High-speed rotation will generate loud noise, affecting the working environment and operating efficiency. Gas flow loss, leakage loss and wheel resistance loss are relatively large.

[0004] To this end, a CO centrifugal compressor structure is proposed. Utility Model Content

[0005] The purpose of the present invention is to provide a CO centrifugal compressor structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a CO centrifugal compressor structure, comprising a compressor cylinder body, an inner shell assembly being arranged inside the compressor cylinder body, the driving machine side of the compressor cylinder body being the cylinder bottom, and the free end being open as the cylinder mouth, the inner shell assembly being a cylindrical assembly inserted from the free end, a limiter being arranged above the inner wall of the compressor cylinder body, the position of the inner shell assembly being determined by the limiter, the inner shell assembly being provided with an inlet volute at one end of a horizontally split partition, a motor being fixedly connected to the middle part of the inlet volute, the inner shell assembly being provided with an outlet volute at the other end of the horizontally split partition, the inner wall of the inlet volute being provided with a first shaft seal, and the inner wall of the outlet volute being provided with a second shaft seal.

[0007] Preferably, a second bearing is provided in the middle of the first shaft seal, and a first bearing is provided in the middle of the second shaft seal.

[0008] Preferably, a compressor rotor is provided inside the compressor cylinder.

[0009] Preferably, a main shaft is rotatably connected to the middle of the compressor cylinder, and an impeller is interference-fitted on the outer wall of the main shaft.

[0010] Preferably, a compressor partition is provided inside the inner shell assembly, and the compressor partition is a combination of a vaneless diffuser and a vane returner.

[0011] Preferably, the bottom of the compressor cylinder is fixedly connected to a base.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] By adjusting the sealing system inside the compressor cylinder, the interference fit, loosening speed and strength of the impeller assembly have been analyzed by finite element analysis. The operating speed and critical speed of the rotor ensure sufficient isolation margin to reduce friction loss. The inner surface of the impeller is processed with high precision, that is, the impeller from the wheel cover to the blades is all processed by CNC machine tools with high surface finish. The impeller is a forging processed by welding or milling machine, and the welding type is full penetration welding. The compressor partition is made of high-quality structural steel to reduce friction loss. The guide vanes of the partition are processed by CNC machine tools. The radial bearing is a five-piece tiltable and swingable bearing structure, and the thrust bearing is a double-acting, self-balancing and self-leveling type. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the internal structure of the compressor cylinder of the utility model;

[0015] Figure 2 This is a three-dimensional schematic diagram of the overall device of the utility model;

[0016] Figure 3 It is a side view schematic diagram of the overall device of the utility model.

[0017] In the picture:

[0018] 1. Compressor cylinder; 2. Inner shell assembly; 2.1. Compressor partition; 3. Limiter; 4. First shaft seal; 5. Second shaft seal; 6. First bearing; 7. Second bearing; 8. Compressor rotor; 8.1. Impeller; 9. Outlet volute; 10. Inlet volute; 11. Motor; 12. Base. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1 to 3, is an embodiment provided by the utility model: a CO centrifugal compressor structure, a compressor cylinder 1, an inner shell assembly 2 is provided inside the compressor cylinder 1, the driving machine side of the compressor cylinder 1 is the cylinder bottom, the free end is open as the cylinder mouth, the inner shell assembly 2 is a cylindrical assembly inserted from the free end, a limiter 3 is provided above the inner wall of the compressor cylinder 1, the position of the inner shell assembly 2 is determined by the limiter 3, the inner shell assembly 2 is provided with an inlet volute 10 at one end of the horizontally split partition, the middle part of the inlet volute 10 is fixedly connected to the motor 11, the inner shell assembly 2 is provided with an outlet volute 9 at the other end of the horizontally split partition, the inner wall of the inlet volute 10 is provided with a first shaft seal 4, and the inner wall of the outlet volute 9 is provided with a second shaft seal 5;

[0021] The compressor is a single-cylinder, two-stage structure with three-stage impellers in each stage.

[0022] Better: The seals of the impeller 8.1 and the balance drum should be labyrinth type and made of aluminum alloy. The labyrinth seal is made of aluminum alloy. The interference fit, loosening speed and strength of the impeller 8.1 are analyzed by finite element analysis. The operating speed and critical speed of the rotor ensure sufficient isolation margin to reduce friction loss. The inner surface of the impeller 8.1 is processed with high precision, that is, the impeller 8.1 from the wheel cover to the blades is all processed by CNC machine tools with high surface finish. The impeller is a forging processed by welding or milling machine, and the welding type is full penetration welding. The horizontally split partition is fastened along the mating surface. The first shaft seal 4 and the second shaft seal 5 are a two-way dry gas sealing system. The seal is in series and includes two stages of seals: main seal and insurance seal. The dry gas seal has matching marks and can be installed and removed as a whole with the base to ensure that the rotating and stationary parts are in the correct relative positions during the compressor assembly.

[0023] A second bearing 7 is provided in the middle of the first shaft seal 4, a first bearing 6 is provided in the middle of the second shaft seal 5, a compressor rotor 8 is provided inside the compressor cylinder 1, a main shaft is rotatably connected to the middle of the compressor cylinder 1, an impeller 8.1 is interference-fitted on the outer wall of the main shaft, a compressor partition 2.1 is provided inside the shell assembly 2, and the compressor partition 2.1 is a combination of a vaneless diffuser and a vane return flow device, and a base 12 is fixedly connected to the bottom of the compressor cylinder 1;

[0024] The first and second bearings 6 and 7 are constructed with five tiltable, swingable bearing pads. The compressor partition 2.1 is a combination of a vaneless diffuser and a vane returner, made of high-quality structural steel. To reduce friction losses, the partition's guide vanes are machined using CNC machines.

[0025] Better: The compressor partition is made of high-quality structural steel to reduce friction loss. The guide vanes of the partition are processed by CNC machine tools. The radial bearing is a five-piece tiltable and swingable bearing structure. The thrust bearing is a double-acting, self-balancing and self-leveling type.

[0026] The above implementation works as follows:

[0027] The steps for running the job are as follows:

[0028] The seal of impeller 8.1 and balance drum should be labyrinth type and made of aluminum alloy. The labyrinth seal should be made of aluminum alloy. The interference fit of impeller 8.1 should be The loosening speed and strength have been analyzed by finite element analysis. The working speed and critical speed of the rotor ensure sufficient isolation margin to reduce friction loss. The inner surface of the impeller 8.1 is processed with high precision, that is, the impeller 8.1 from the wheel cover to the blades is all processed by CNC machine tools with high surface finish. The impeller is a forging processed by welding or milling machine. The welding type is full penetration welding. The horizontally split partition is fastened along the mating surface. The first shaft seal 4 and the second shaft seal 5 are a two-way dry gas sealing system. The seal is in series, including two stages: the main seal and the insurance seal. The dry gas seal has matching marks and can be installed and removed as a whole with the base to ensure that the rotating and stationary parts are in the correct relative position when the compressor is assembled. The compressor partition is made of high-quality structural steel to reduce friction loss. The guide vanes of the partition are processed by CNC machine tools. The radial bearing is a five-piece tiltable and swingable bearing structure. The thrust bearing is double-acting, self-balancing and self-leveling.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CO centrifugal compressor structure, characterized by: The invention comprises a compressor cylinder (1), wherein an inner shell assembly (2) is provided inside the compressor cylinder (1), a driving machine side of the compressor cylinder (1) is a cylinder bottom, and a free end is open as a cylinder mouth, the inner shell assembly (2) is a cylindrical assembly inserted from the free end, a limiter (3) is provided above the inner wall of the compressor cylinder (1), and the position of the inner shell assembly (2) is determined by the limiter (3), the inner shell assembly (2) is provided with an inlet volute (10) at one end of a horizontally split partition, a motor (11) is fixedly connected to the middle of the inlet volute (10), and the inner shell assembly (2) is provided with an outlet volute (9) at the other end of the horizontally split partition, the inner wall of the inlet volute (10) is provided with a first shaft seal (4), and the inner wall of the outlet volute (9) is provided with a second shaft seal (5).

2. A CO centrifugal compressor structure according to claim 1, characterized in that: A second bearing (7) is provided in the middle of the first shaft seal (4), and a first bearing (6) is provided in the middle of the second shaft seal (5).

3. A CO centrifugal compressor structure according to claim 2, characterized in that: A compressor rotor (8) is provided inside the compressor cylinder (1).

4. A CO centrifugal compressor structure according to claim 3, characterized in that: The middle of the compressor cylinder (1) is rotatably connected to a main shaft, and an impeller (8.1) is interference-fitted on the outer wall of the main shaft.

5. A CO centrifugal compressor structure according to claim 4, characterized in that: A compressor partition (2.1) is provided inside the inner shell assembly (2), and the compressor partition (2.1) is a combination of a bladeless diffuser and a blade returner.

6. A CO centrifugal compressor structure according to claim 5, characterized in that: The bottom of the compressor cylinder (1) is fixedly connected to a base (12).

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