Centrifugal compressor with balancing structure

Abstract

The utility model relates to a compressor technical field especially relates to a centrifugal compressor with balance structure, including inlet, outer casing, volute, front bearing assembly, elastic force compensation spare, axial thrust assembly, power part, export, back cover, balance disc, key, balance cavity, shaft card, screw A, impeller, screw B, screw C, sealing washer and inlet apron, inlet and outer casing weld, back cover is connected with front bearing assembly through screw C, and fixes power part, axial thrust assembly is connected with power part, front bearing assembly is connected with axial thrust assembly, and back cover inside is installed through the interference fit of extruding sealing washer with front bearing assembly and sealing washer, and in this way, the technical problem that the normal operation and service life of the compressor are influenced by the fact that the axial force generated in the prior art pushes the impeller to the inlet side of the compressor, leading to excessive stress on the seal and other components of the compressor, is solved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a centrifugal compressor with a balancing structure. Background Technology

[0002] The working principle of a centrifugal compressor is based on centrifugal motion. When a high-speed rotating impeller drives the gas in a circular motion, the gas is thrown from the center of the impeller to the outer edge due to centrifugal force, increasing its velocity during this process. Subsequently, the gas enters the diffuser, where the gradually increasing flow cross-sectional area causes the gas velocity to gradually decrease, while the pressure increases accordingly, thus achieving a pressure increase. Compared with other types of compressors, centrifugal compressors have many significant advantages.

[0003] However, during operation, the pressure of the liquid on the impeller of a centrifugal compressor generates an axial force. This axial force pushes the impeller towards the compressor inlet side. If left uncontrolled, this can cause excessive stress on the compressor's seals and other components, thus affecting the compressor's normal operation and service life. Utility Model Content

[0004] The purpose of this invention is to provide a centrifugal compressor with a balancing structure, which solves the technical problem in the prior art where the axial force generated pushes the impeller towards the compressor inlet side, causing excessive stress on the compressor seals and other components, thereby affecting the normal operation and service life of the compressor.

[0005] To achieve the above objectives, this utility model provides a centrifugal compressor with a balancing structure, including an inlet, an outer casing, a volute, a front bearing assembly, an elastic compensator, an axial thrust assembly, a power component, an outlet, a rear cover plate, a balance disc, a flat key, a balance chamber, a shaft clip, screw A, an impeller, screw B, screw C, a sealing ring, and an inlet cover plate.

[0006] The inlet is welded to the outer casing. The rear cover is connected to the front bearing assembly via screw C and fixes the power component. The axial thrust assembly is connected to the power component. The front bearing assembly is connected to the axial thrust assembly. The interior of the rear cover is installed with the front bearing assembly via an interference fit using a sealing ring. The elastic compensation component is used to compensate for the elastic force at the right end face of the front bearing assembly. The flat key and balance disc are installed on the axial thrust assembly and their degrees of freedom are restricted by the shaft clamp. The balance chamber is fixed to the rear cover with screw A. The volute is installed with the axial thrust assembly via a special locking position on the axial thrust assembly and its degrees of freedom are restricted by the end nut. The sealing ring is fixed to the volute with screw B. The inlet cover is located on the inlet.

[0007] The front bearing assembly includes a bushing and a front cover plate, which are installed by a hot-fitting process to form a connection between the front bearing assembly and the axial thrust assembly.

[0008] The elastic compensation component includes a wave-shaped pad and a retaining ring. The wave-shaped pad is installed on one side of the front bearing assembly, and the retaining ring clamps the right end of the wave-shaped pad.

[0009] The axial thrust assembly includes a thrust disk and a rotor shaft; the thrust disk and the rotor shaft are installed together by heating or cold pressing to form the axial thrust assembly connected to the front bearing assembly.

[0010] The power component includes a motor and a motor housing, the motor housing being disposed between the front cover plate and the rear cover plate, and the motor being disposed within the motor housing.

[0011] This invention relates to a centrifugal compressor with a balancing structure. When the power component is energized, it generates electromagnetic force, causing the shaft clamp to rotate at high speed. Liquid enters the compressor through the inlet. The impeller, rotating at high speed, generates centrifugal force and simultaneously experiences an axial force from right to left, moving the axial thrust assembly to the left. Liquid is thrown into the volute by the impeller, creating high pressure. Low-pressure liquid flows through a small hole in the center of the axial thrust assembly to the left side of the balancing chamber and the right side of the balancing disc, forming a low-pressure area. High-pressure liquid flows through the volute into the outer casing, and then through a small hole on the surface of the rear cover into the high-pressure area formed between the front bearing assembly and the balancing disc. At this point, the balancing disc experiences a balancing force from left to right. This counteracts some of the axial force, reducing the axial thrust between the axial thrust assembly and the front bearing assembly, allowing the centrifugal compressor to operate stably for extended periods. This approach solves the technical problem in existing technologies where the axial force generated pushes the impeller towards the compressor inlet side, causing excessive stress on the compressor's seals and other components, thus affecting the compressor's normal operation and service life. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a schematic diagram of the centrifugal compressor with a balancing structure according to this utility model.

[0014] In the diagram: 1-Inlet, 2-Outer shell, 3-Vortex, 4-Shaft sleeve, 5-Thrust disc, 6-Rotor shaft, 7-Motor, 8-Outlet, 9-Rear cover plate, 10-Balance disc, 11-Flat key, 12-Balance chamber, 13-Shaft clip, 14-Screw A, 15-Wave wave pad, 16-Impeller, 17-Front cover plate, 18-Screw B, 19-Screw C, 20-Hole snap ring, 21-Motor housing, 22-Sealing ring, 23-Inlet cover plate. Detailed Implementation

[0015] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0016] Please see Figure 1 , Figure 1 This is a schematic diagram of the centrifugal compressor with a balancing structure according to this utility model.

[0017] This utility model provides a centrifugal compressor with a balancing structure, including an inlet 1, an outer casing 2, a volute 3, a front bearing assembly, a spring compensation component, an axial thrust assembly, a power component, an outlet 8, a rear cover plate 9, a balance disc 10, a flat key 11, a balance chamber 12, a shaft retainer 13, a screw A14, an impeller 16, a screw B18, a screw C19, a sealing ring 22, and an inlet cover plate 23; the front bearing assembly includes a bushing 4 and a front cover plate 17, the spring compensation component includes a wave-shaped pad 15 and a hole retaining spring 20, the axial thrust assembly includes a thrust disc 5 and a rotor shaft 6; the power component includes a motor 7 and a motor housing 21, the aforementioned solution

[0018] In this specific embodiment, the inlet 1 is welded to the outer shell 2, the rear cover plate 9 is connected to the front bearing assembly via the screw C19 and fixes the power component, the axial thrust assembly is connected to the power component, the front bearing assembly is connected to the axial thrust assembly, the interior of the rear cover plate 9 is installed with the front bearing assembly by an interference fit of the sealing ring 22, the elastic compensation component is used to provide elastic compensation at the right end face of the front bearing assembly, the flat key 11 and the balance disc 10 are installed on the axial thrust assembly and their degrees of freedom are restricted by the shaft clip 13; the balance chamber 12 is fixed to the rear cover plate 9 with the screw A14, the volute 3 is installed together with the axial thrust assembly via a special slot on the axial thrust assembly and its degrees of freedom are restricted by the end nut, the sealing ring 22 is fixed to the volute 3 with the screw B18, and the inlet cover plate 23 is disposed on the inlet 1;

[0019] The bushing 4 and the front cover plate 17 are installed by a hot-mounting process to form a connection between the front bearing assembly and the axial thrust assembly;

[0020] The wave pad 15 is installed on one side of the front bearing assembly, and the hole retaining spring 20 clamps the right end of the wave pad 15.

[0021] The thrust disk 5 and the rotor shaft 6 are installed together by heating or cold pressing to form the axial thrust assembly and the front bearing assembly;

[0022] The motor housing 21 is disposed between the front cover plate 17 and the rear cover plate 9, and the motor 7 is disposed inside the motor housing 21.

[0023] First, the liquid medium flows into and fills the equipment from the inlet 1. After the motor 7 is powered on, it generates a certain magnetic field. Other parts that are fixed together with the bushing 4 will rotate at high speed under the action of the magnetic field. At this time, the impeller 16 rotates and generates centrifugal force, which throws the liquid onto the inner wall of the volute 3 to form a liquid with a certain pressure. The high-pressure liquid flows through the special flow channel on the volute 3 inside the equipment and is discharged from the outlet 8, providing pressurized liquid to the system.

[0024] Because the left surface of the outlet 8 is connected to the inlet 1, and the right surface contains high-pressure liquid, coupled with its irregular design, a pressure difference is created. This force, an axial force F1, pushes the impeller 16 from right to left, which in turn drives other components fixed to the rotor shaft 6 to move to the left. At this time, the friction between the thrust disc 5 and the bushing 4 increases sharply, and the overall output power of the motor 7 gradually increases due to the increased friction. Over time, this will cause wear and tear, and the equipment will stop working.

[0025] At this time, some liquid flows through the small hole in the middle of the rotor shaft 6 into the low-pressure chamber formed by the right surface of the balance disk 10 and the balance cavity 12; at this time, high-pressure liquid flows through several small holes on the surface of the rear cover plate 9 into the high-pressure chamber formed between the left surface of the balance disk 10, the balance cavity 12, and the rear cover plate 9. The left end of the balance disk 10 is the high-pressure chamber, and the right end is connected to the inlet 1, forming a pressure difference that pushes the balance disk 10 to move from left to right. This force is the balancing force F2.

[0026] When the equipment starts operating, F1 pushes the rotating component to the left. Subsequently, due to the pressure difference formed by the balance disc 10, F2 pushes the rotating component to the right. Through the elastic compensation of the wave-shaped pad 15, a dynamic equilibrium state is gradually formed, reducing the friction between the thrust disc 5 and the bushing 4. This ensures the long-term normal operation of the equipment.

[0027] The outer shell 2 comprises a straight cylindrical body and two semi-circular bodies, both of which are welded to the straight cylindrical body. The inlet 1 and the outlet 8 are respectively welded to one of the semi-circular bodies and the straight cylindrical body.

[0028] Secondly, the inlet 1 is fully welded to the outer casing 2. The remaining components are contained inside the device, such that liquid enters only through the inlet 1 and exits only through the outlet 8.

[0029] Using a centrifugal compressor with a balancing structure according to this invention, when the power component is energized, the electromagnetic force generates a high-speed rotation of the shaft clamp 13. Liquid enters the compressor through the inlet 1. The impeller 16 generates centrifugal force under high-speed rotation, and simultaneously experiences an axial force from right to left, moving the axial thrust assembly to the left. The liquid is thrown into the volute 3 through the impeller 16, forming a high-pressure area. The low-pressure liquid flows through the small hole in the middle of the axial thrust assembly to the left side of the balancing chamber 12 and the right side of the balancing disc 10, forming a low-pressure area. The high-pressure liquid flows through the volute 3 into the outer casing 2, and then through the small hole on the surface of the rear cover plate 9 into the high-pressure area formed between the front bearing assembly and the balancing disc 10. At this time, the balancing disc 10 experiences a balancing force from left to right. This can offset part of the axial force and reduce the axial thrust between the axial thrust assembly and the front bearing assembly, enabling the centrifugal compressor to operate stably for a long time. This approach solves the technical problem in existing technologies where the axial force generated pushes the impeller towards the compressor inlet side, causing excessive stress on the compressor's seals and other components, thus affecting the compressor's normal operation and service life.

[0030] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A centrifugal compressor with a balancing structure, characterized in that, It includes the inlet, outer casing, volute, front bearing assembly, spring compensation component, axial thrust assembly, power component, outlet, rear cover plate, balance disc, flat key, balance chamber, shaft clip, screw A, impeller, screw B, screw C, sealing ring, and inlet cover plate. The inlet is welded to the outer casing. The rear cover is connected to the front bearing assembly via screw C and fixes the power component. The axial thrust assembly is connected to the power component. The front bearing assembly is connected to the axial thrust assembly. The interior of the rear cover is installed with the front bearing assembly via an interference fit using a sealing ring. The elastic compensation component is used to compensate for the elastic force at the right end face of the front bearing assembly. The flat key and balance disc are installed on the axial thrust assembly and their degrees of freedom are restricted by the shaft clamp. The balance chamber is fixed to the rear cover with screw A. The volute is installed with the axial thrust assembly via a special locking position on the axial thrust assembly and its degrees of freedom are restricted by the end nut. The sealing ring is fixed to the volute with screw B. The inlet cover is located on the inlet.

2. The centrifugal compressor with a balancing structure as described in claim 1, characterized in that, The front bearing assembly includes a bushing and a front cover plate, which are installed by a hot-fitting process to form a connection between the front bearing assembly and the axial thrust assembly.

3. The centrifugal compressor with a balancing structure as described in claim 2, characterized in that, The elastic compensation component includes a wave-shaped pad and a retaining ring. The wave-shaped pad is installed on one side of the front bearing assembly, and the retaining ring clamps the right end of the wave-shaped pad.

4. The centrifugal compressor with a balancing structure as described in claim 3, characterized in that, The axial thrust assembly includes a thrust disk and a rotor shaft; the thrust disk and the rotor shaft are installed together by heating or cold pressing to form the axial thrust assembly connected to the front bearing assembly.

5. The centrifugal compressor with a balancing structure as described in claim 4, characterized in that, The power component includes a motor and a motor housing, the motor housing being disposed between the front cover plate and the rear cover plate, and the motor being disposed within the motor housing.

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