Centrifugal compressor casing flow adjusting assembly and casing trepanning method

Abstract

The invention provides a centrifugal compressor casing flow adjusting assembly and a casing tapping construction method.The centrifugal compressor casing flow adjusting assembly comprises a centrifugal compressor and a casing, a first hole set and a second hole set are formed in the side wall of the casing, and the first hole set and the second hole set are arranged at intervals along the axis of the casing; the first hole group comprises a plurality of first holes which are uniformly distributed along the periphery of the casing, the second hole group comprises a plurality of second holes which are uniformly distributed along the periphery of the casing, and the diameter of the second holes is larger than that of the first holes. According to the centrifugal compressor casing flow adjusting assembly, the multiple first holes and the multiple second holes can guide airflow to move, separation and vortex of the airflow on the inner wall face of the casing are reduced, and flowing energy loss is reduced; as the apertures of the first hole and the second hole are different, the flow rates of the airflow flowing through the first hole and the second hole are different, and the periodic fluctuation in the flowing process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of axial flow compressors, and in particular relates to a centrifugal compressor casing flow regulating assembly and a casing opening method. Background Art

[0002] Flow instability phenomena in compression systems, such as rotating stall and surge, have become one of the most important issues that seriously restrict the development of compressors due to the complexity of the flow and the severity of the harmful consequences. When the compressor operates under a relatively small flow condition, rotating stall and surge, two unsteady flow phenomena, often occur. When the flow of the compressor is continuously reduced to a certain value, due to the large positive angle of attack at the inlet of the blade channel, the airflow boundary layer on the non-working surface of the blade will be severely separated and gradually diffuse outward along the blade channel. In actual production, due to problems such as machining errors, the geometric structure of the impeller blades has slight differences, and the inlet flow of the impeller is non-uniform. The influence of the two causes the airflow separation phenomenon in the impeller to occur first on one or several blades, and gradually forms an airflow separation group. When the airflow separation group appears in each blade channel of the impeller at a relatively small propagation speed during the rotation of the impeller, it will form a rotating stall, which will cause the compressor to surge. Surge will greatly reduce the performance of the compressor and even cause serious damage to the components in the compressor.

[0003] At present, flow control is generally carried out by opening holes in the casing. However, the existing holes change the sealing gap between the impeller and the casing. During operation, vortices appear in the airflow, which will cause energy loss in the entire operating range, resulting in a decrease in the efficiency of the centrifugal compressor unit. Summary of the invention

[0004] The embodiment of the present invention provides a centrifugal compressor casing flow regulating assembly and a casing opening method, aiming to solve the technical problem in the prior art that the conventional method of controlling surge will cause the efficiency of the centrifuge to decrease.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, a centrifugal compressor casing flow regulating assembly is provided, comprising a centrifugal compressor and a casing, wherein a first hole group and a second hole group are formed on a side wall of the casing, wherein the first hole group and the second hole group are spaced apart along the axis of the casing; the first hole group comprises a plurality of first holes uniformly distributed along the outer circumference of the casing, and the second hole group comprises a plurality of second holes uniformly distributed along the outer circumference of the casing, wherein the diameter of the second holes is greater than the diameter of the first holes.

[0006] In combination with the first aspect, in a possible implementation manner, the angle between two adjacent axes of the first holes is 25-35°; the angle between two adjacent axes of the second holes is 25-35°.

[0007] In combination with the first aspect, in a possible implementation manner, the angle between the axis of the first hole and the compressor shaft is -5° to +5°.

[0008] In combination with the first aspect, in a possible implementation manner, the cross-sectional area of ​​the second hole is four times the cross-sectional area of ​​the first hole.

[0009] In combination with the first aspect, in a possible implementation manner, the number of the first holes is the same as the number of the second holes.

[0010] In combination with the first aspect, in a possible implementation manner, the number of the first holes and the number of the impeller blades of the centrifugal compressor are mutually prime numbers; The number of the second holes and the number of the centrifugal compressor impeller blades are mutually prime numbers.

[0011] Compared with the prior art, the centrifugal compressor casing flow regulating assembly provided by the present invention has two groups of annular slots on the casing. When the casing is in use, the airflow flows through the casing, and the multiple first holes and the multiple second holes can guide the movement of the airflow, reduce the separation and eddy current of the airflow on the inner wall of the casing, reduce the energy loss of the flow, and avoid surge. Since the apertures of the first holes and the second holes are different, the flow velocities of the airflow through the first holes and the second holes are different, resulting in the airflow being broken up, reducing the periodic fluctuations in the flow, avoiding the resonance phenomenon in the compressor, ensuring the stability of the compressor operation, enhancing the stabilization effect of the compressor, and improving the working efficiency of the compressor.

[0012] In a second aspect, a casing opening method is provided for processing a centrifugal compressor casing flow regulating assembly of any one of the above possible implementations, comprising the following steps: S1: Obtain the processing positions of the first hole and the second hole according to the number of centrifuge impeller blades and the position of the centrifuge compression shaft, and perform pre-marking; S2: performing drilling at the pre-processing position to form a first pre-formed hole of the first hole and a second pre-formed hole of the second hole respectively; S3: deburring and cleaning impurities from the first prefabricated hole to form a first processed hole, and deburring and cleaning impurities from the second prefabricated hole to form a second processed hole; S4: performing metal plating in the first processing hole to form the first hole, and performing metal plating in the second processing hole to form the second hole.

[0013] In combination with the second aspect, in a possible implementation, in step S2, drilling monitoring is performed during the drilling process to ensure that the hole opening position overlaps with the pre-processing position.

[0014] In conjunction with the second aspect, in a possible implementation, the step before S2 includes: removing rust and dirt from the surface of the casing; Surface rust removal includes mechanically brushing off the surface rust to obtain a preliminary rust-removed casing; spraying abrasives on the outer surface of the preliminary rust-removed casing for secondary grinding to obtain a secondary processed casing; immersing the secondary processed casing in an acid solution to remove rust through chemical reaction to obtain a casing to be drilled.

[0015] In combination with the second aspect, in a possible implementation, step S4 further includes performing secondary curing on the plating on the surface of the first hole and the plating on the surface of the second hole, respectively.

[0016] Compared with the prior art, the casing opening method provided by the present invention provides a method for opening holes, wherein the number of opening holes and the positions of the opening holes are determined according to the number of impeller blades and the position of the compression shaft of the compressor, and the manufactured first holes and second holes can reasonably guide and break up the airflow, prevent the airflow from eddying, avoid the occurrence of surge phenomenon, and improve the stability during use; after drilling and punching, metal plating is performed in the first hole and the second hole, and the metal plating contacts the airflow, thereby avoiding the first hole and the second hole from directly contacting the airflow, reducing the wear of the first hole and the second hole, reducing the number of maintenance times, and extending the service life of the casing; the casing openings manufactured by the method, the multiple first holes and the multiple second holes can guide the movement of the airflow, reduce the separation and eddy of the airflow on the inner wall of the casing, reduce the energy loss of the flow, and avoid the occurrence of surge phenomenon; due to the different apertures of the first hole and the second hole, the flow velocities of the airflow passing through the first hole and the second hole are different, resulting in the airflow being broken up, reducing the periodic fluctuation in the flow, avoiding the resonance phenomenon in the compressor, ensuring the stability of the compressor operation, and enhancing the stabilization effect of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic structural diagram of a centrifugal compressor casing flow regulating assembly provided in one embodiment of the present invention; Figure 2 It is a structural schematic diagram of a centrifugal compressor casing flow regulating assembly used in one embodiment of the present invention; Figure 3 This is a schematic structural diagram of a centrifugal compressor casing flow regulating assembly adopted in yet another embodiment of the present invention.

[0019] Description of reference numerals: 1. Receiver; 2. The first hole; 3. The second hole. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0025] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0028] Please also read Figures 1 to 3, the centrifugal compressor casing flow regulating assembly provided by the present invention is now described. The centrifugal compressor casing flow regulating assembly comprises a centrifugal compressor and a casing 1, the side wall of the casing 1 is provided with a first hole group and a second hole group, the first hole group and the second hole group are arranged at intervals along the axis of the casing 1; the first hole group comprises a plurality of first holes 2 evenly distributed along the outer circumference of the casing 1, the second hole group comprises a plurality of second holes 3 evenly distributed along the outer circumference of the casing 1, and the diameter of the second hole 3 is greater than the diameter of the first hole 2.

[0029] It should be noted that the first hole 2 and the second hole 3 are irregular holes. The arrangement of the irregular holes further disperses the airflow when it passes through, thereby reducing the periodic fluctuation of the gas flow.

[0030] As an embodiment of the first hole 2 and the second hole 3, see Figure 1 The first hole 2 and the second hole 3 are both circular holes. The first hole 2 is arranged close to the front edge of the casing 1, and the second hole 3 is arranged at a distance from the first hole 2, and the diameter of the second hole 3 is larger than the diameter of the first hole 2.

[0031] As another embodiment of the first hole 2 and the second hole 3, see Figure 2 The first hole 2 and the second hole 3 are both diamond-shaped holes. The first hole 2 is arranged close to the front edge of the casing 1, and the second hole 3 is arranged at a distance from the first hole 1, and the diamond side length of the second hole 3 is greater than the diamond side length of the first hole 2.

[0032] As another embodiment of the first hole 2 and the second hole 3, see Figure 3 The first hole 2 and the second hole 3 are both gourd-shaped holes, formed by the intersection of two circular holes. The first hole 2 is arranged close to the front edge of the casing 1, and the second hole 3 is arranged at an interval from the first hole 1, and the outer circumference of the second hole 3 is greater than the outer circumference of the first hole 2.

[0033] Compared with the prior art, the centrifugal compressor casing flow regulating assembly provided in the present embodiment has two groups of annular slots on the casing 1. When the casing 1 is in use, the airflow flows through the casing 1, and the multiple first holes 2 and the multiple second holes 3 can guide the movement of the airflow, reduce the separation and eddy current of the airflow on the inner wall of the casing 1, reduce the energy loss of the flow, and avoid surge. Since the apertures of the first holes 2 and the second holes 3 are different, the flow velocities of the airflow through the first holes 2 and the second holes 3 are different, which causes the airflow to be broken up, reduces the periodic fluctuations in the flow, avoids the resonance phenomenon in the compressor, ensures the stability of the compressor operation, enhances the stabilization effect of the compressor, and improves the working efficiency of the compressor.

[0034] In specific implementation, the inner diameter of the first hole 2 is not less than 3 mm, and the inner diameter of the second hole 3 is not greater than 6 mm. The inner diameter of the first hole 2 is not less than 3 mm, which will not reduce the gas circulation efficiency and ensure the normal work of reducing the occurrence of airflow vortex; the inner diameter of the second hole 3 is not greater than 6 mm, which will not reduce the structural strength of the casing 1 and ensure the service life and use strength of the casing 1. The center of the first hole 2 is 20 mm away from the center of the second hole 3.

[0035] In some embodiments, the angle between the axes of two adjacent first holes 2 is 25-35°; the angle between the axes of two adjacent second holes 3 is 25-35°. The angle between two adjacent first holes 2 is 25-35°, which enables multiple first holes 2 to quickly and effectively guide airflow in the circumferential direction of the casing 1, improves the airflow guiding speed, and does not cause the strength of the casing 1 to decrease; the angle between two adjacent second holes 3 is 25-35°, which enables multiple second holes 3 to quickly and effectively guide airflow in the circumferential direction of the casing 1, improves the airflow guiding speed, and does not cause the strength of the casing 1 to decrease.

[0036] In a specific implementation, the angle between the axes of two adjacent first holes 2 is 30°; the angle between the axes of two adjacent second holes 3 is 30°.

[0037] In some embodiments, the angle between the axis of the first hole 2 and the compressor shaft is -5° to +5°. The angle between the axis of the first hole 2 and the compressor shaft is -5° to +5°, which can optimize the gas flow path, so that the gas can enter the compressor at the best angle, reducing the energy loss of the gas during the flow process. By precisely controlling the axis angle between the first hole 2 and the second hole 3, it can be ensured that the airflow enters the compressor at the best angle, reducing the energy loss caused by airflow impact or vortex.

[0038] In some embodiments, the cross-sectional area of ​​the second hole 3 is four times that of the first hole 2. As a preferred solution for the ratio of the second hole 3 to the first hole 2, the cross-sectional area of ​​the second hole 3 is four times that of the first hole 2. At this time, the gas flow rate of the first hole 2 is more than twice that of the gas flow rate of the second hole 1, which accelerates the dispersion of the gas, helps to expand the stall margin of the compressor, and improves the stability and reliability of the equipment.

[0039] In some embodiments, see Figure 1 , the number of the first holes 2 is the same as the number of the second holes 3. The number of the first holes 2 is the same as the number of the second holes 3, and the gas can be discharged from the first holes 2 and the second holes 3 along the same path.

[0040] In specific implementation, the central axis of the adjacent first hole 2 and the central axis of the second hole 3 are collinear, and the straight line where the central axis of the first hole 2 and the central axis of the second hole 3 are located is parallel to the axis of the casing 1. The line connecting the central axes of the adjacent first holes 2 and the second holes 3 is parallel to the axis of the casing 1, so that the gas can reduce the collision with the inner wall of the casing 1 when flowing and discharging, and reduce the eddy and turbulent phenomena of the airflow inside the casing 1. This design can make the airflow pass through the casing 1 more smoothly, thereby reducing the noise level and improving the use experience of the compressor.

[0041] In some embodiments, the number of first holes 2 and the number of centrifugal compressor impeller blades are mutually prime; the number of second holes 3 and the number of centrifugal compressor impeller blades are mutually prime. The prime number distribution of the first holes 2 and the second holes 3 helps to break up the airflow, reduce the periodic fluctuations in the gas flow, and avoid the resonance phenomenon that may be generated inside the compressor.

[0042] As a specific embodiment of the opening of the receiver 1, two rows of circular grooves are arranged on the receiver 1, the first row is located at the front edge of the receiver, the secondary circular grooves are first holes 2, the diameter of the first hole 2 is 2mm, the second row of circular grooves are second holes 3, the center of the second hole 3 is about 20mm away from the center of the first hole 2, and the diameter is 4mm. In the radial direction, the angle between the circular grooves is 30°, and there are 12 first holes 2 and 12 second holes 3 distributed in the radial direction.

[0043] Based on the unified inventive concept, the present application also provides a casing hole drilling method for processing the centrifugal compressor casing flow regulating assembly of any one of the above-mentioned embodiments, including the following steps: S1: obtaining the processing positions of the first hole 2 and the second hole 3 according to the number of centrifuge impeller blades and the position of the centrifuge compression shaft, and pre-marking; S2: drilling and punching at the pre-processing position to form a first prefabricated hole of the first hole 2 and a second prefabricated hole of the second hole 3 respectively; S3: deburring and cleaning the first prefabricated hole to form a first processed hole, deburring and cleaning the second prefabricated hole to form a second processed hole; S4: performing metal plating in the first processing hole to form the first hole 2, and performing metal plating in the second processing hole to form the second hole 3.

[0044] It should be noted that burrs, oil stains and debris are generated during the drilling process, and they are removed in step S3 to prevent the burrs, oil stains and debris from reducing the adhesion of the coating and increasing the surface roughness of the coating.

[0045] In specific implementation, for smaller burrs, manual grinding or ultrasonic vibration method can be used to remove them; for larger burrs, mechanical deburring equipment or other methods are required to remove them. According to the selected processing method, the burrs on the casing 1 are removed.

[0046] In specific implementation, the oil stains generated during the processing of circular holes, diamond holes and gourd-shaped holes can be cleaned by scrubbing with cotton yarn or brush dipped in diesel or kerosene. For parts that are difficult to clean, the chemical action of the cleaning liquid and ultrasonic vibration are used together to remove the oil stains.

[0047] In specific implementation, the metal coating can be carried out by electroplating or chemical plating, and the composition, temperature and current density of the electroplating solution or the plating solution can be controlled; in the thermal spraying process, the temperature, speed and spraying distance of the spraying material need to be controlled.

[0048] In specific implementation, the centrifuge impeller blades are determined before drilling holes so that the number of holes and the impeller blades are prime numbers to each other, and then the size and specific position of the first hole 2 and the second hole 3 are respectively obtained by using a measuring tool.

[0049] Compared with the prior art, the casing opening method provided in this embodiment provides a method for opening holes. The number and positions of the opening holes are determined according to the number of impeller blades and the position of the compression shaft of the compressor. The first holes 2 and the second holes 3 manufactured can reasonably guide and break up the airflow, prevent the airflow from vortexing, avoid the occurrence of surge, and improve the stability during use. After drilling and drilling, metal plating is performed in the first holes 2 and the second holes 3. The metal plating contacts the airflow, thereby avoiding the first holes 2 and the second holes 3 from directly contacting the airflow, reducing the impact on the first holes 2 and the second holes 3. The invention can reduce wear and tear, reduce the number of maintenance times, and extend the service life of the casing 1. The casing 1 openings made by the method, the multiple first holes 2 and the multiple second holes 3 can guide the movement of the airflow, reduce the separation and eddy current of the airflow on the inner wall of the casing 1, reduce the energy loss of the flow, and avoid the surge phenomenon; due to the different apertures of the first holes 2 and the second holes 3, the flow speeds of the airflow passing through the first holes 2 and the second holes 3 are different, resulting in the airflow being broken up, reducing the periodic fluctuations in the flow, avoiding the resonance phenomenon in the compressor, ensuring the stability of the compressor operation, and enhancing the stabilization effect of the compressor.

[0050] In specific implementation, the casing opening method plays an important role in the chemical industry, energy industry, manufacturing industry and environmental protection field. Chemical production often involves the compression and transportation of various gases. Centrifugal compressors can provide stable and powerful compression force to ensure the smooth progress of chemical reactions. At the same time, the slot design on the casing helps to adjust the reflux volume and expand the stable working area of ​​the centrifugal compressor, thereby avoiding surge phenomenon and ensuring the safety and efficiency of production; in the process of natural gas transportation and storage, the centrifugal compressor can provide continuous and stable compression power to ensure that the natural gas is safely transported to the destination with sufficient pressure. In addition, in power plants, centrifugal compressors are also widely used in air pre-compression and exhaust gas recirculation systems to improve energy conversion efficiency and reduce environmental pollution. The casing slot design helps to optimize gas flow and improve the efficiency of the compressor; whether it is automobile manufacturing, electronic component production or food processing, high-quality compressed air is required. Centrifugal compressors have become an ideal choice for the manufacturing industry due to their high reliability and low maintenance cost. The slot design on the casing helps to further improve the performance and stability of the compressor and ensure the normal operation of the production line; in sewage treatment plants, centrifugal compressors can be used to provide oxygen to promote the decomposition of organic matter in sewage and realize the purification and recycling of water resources. In addition, centrifugal compressors also play a key role in exhaust gas treatment and smoke recovery systems, helping to reduce the impact of industrial production on the environment and promote sustainable development.

[0051] In some embodiments, in step S2, drilling monitoring is performed during the drilling process to ensure that the opening position overlaps with the pre-processing position. Drilling monitoring can avoid machining errors and reduce cost waste.

[0052] In specific implementation, a milling machine, a drilling machine or a laser cutting machine can be used for drilling. The milling machine is suitable for processing annular grooves of larger size and depth, and the material is gradually removed by a rotating milling cutter; the drilling machine is more suitable for processing smaller holes or grooves, which is achieved by rotating and feeding the drill bit; and the laser cutting machine is suitable for processing complex shapes and precise dimensions. The drilling accuracy and quality of the drilling are ensured by monitoring the parameters of the equipment, such as the rotation speed, feed speed and cutting depth. During monitoring, a laser sensor is installed at a preset position to monitor the drilling position and drilling angle during processing to ensure that the processed first hole 2 or second hole 3 meets the preset requirements.

[0053] In some embodiments, before S2, it includes: removing rust and dirt from the surface of the casing 1; surface rust removal includes mechanically brushing off the surface rust to obtain a preliminary rust-removed casing; spraying abrasives (such as corundum or quartz sand) on the outer surface of the preliminary rust-removed casing for secondary grinding to obtain a secondary processed casing; immersing the secondary processed casing in an acidic solution to remove rust through chemical reactions to obtain a casing to be drilled. Rust and dirt on the surface of the casing 1 will affect the drilling accuracy and drilling angle. Removing them in advance can remove adverse factors and ensure drilling quality. The present application uses three steps of rust removal to comprehensively and efficiently remove the rust on the surface of the casing 1, avoiding residual rust, improving cleaning quality, and reducing external factors that cause drilling failure.

[0054] In specific implementation, kerosene or diesel is covered on the dirt for cleaning, or ultrasonic wave and cleaning fluid are used to remove dirt.

[0055] In some embodiments, referring to the figure, step S4 further includes performing secondary curing on the coating on the surface of the first hole 2 and the coating on the surface of the second hole 3. The secondary curing can improve the stability and durability of the coating to extend the service life. In specific implementation, the secondary curing includes cleaning, drying and curing the coating.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrifugal compressor casing flow control assembly, comprising a centrifugal compressor and a casing (1), characterized in that: A first hole group and a second hole group are formed on the side wall of the casing (1), and the first hole group and the second hole group are arranged at intervals along the axis of the casing (1); the first hole group includes a plurality of first holes (2) evenly distributed along the outer circumference of the casing (1), and the second hole group includes a plurality of second holes (3) evenly distributed along the outer circumference of the casing (1), and the diameter of the second holes (3) is greater than the diameter of the first holes (2).

2. The centrifugal compressor casing flow regulating assembly according to claim 1, characterized in that: The angle between the axes of two adjacent first holes (2) is 25-35°; the angle between the axes of two adjacent second holes (3) is 25-35°.

3. The centrifugal compressor casing flow regulating assembly according to claim 2, characterized in that: The included angle between the axis of the first hole (2) and the compressor shaft is between -5° and +5°.

4. The centrifugal compressor casing flow regulating assembly according to claim 1, characterized in that: The cross-sectional area of ​​the second hole (3) is four times the cross-sectional area of ​​the first hole (2).

5. The centrifugal compressor casing flow regulating assembly according to claim 4, characterized in that: The number of the first holes (2) is the same as the number of the second holes (3).

6. The centrifugal compressor casing flow regulating assembly according to claim 1, characterized in that: The number of the first holes (2) and the number of the impeller blades of the centrifugal compressor are mutually prime numbers; The number of the second holes (3) and the number of the centrifugal compressor impeller blades are mutually prime numbers.

7. A casing opening method for processing a centrifugal compressor casing flow regulating assembly according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: obtaining the processing positions of the first hole (2) and the second hole (3) according to the number of centrifuge impeller blades and the position of the centrifuge compression shaft, and pre-marking them; S2: drilling and punching at the pre-processing position to form a first pre-formed hole of the first hole (2) and a second pre-formed hole of the second hole (3) respectively; S3: deburring and cleaning impurities from the first prefabricated hole to form a first processed hole, and deburring and cleaning impurities from the second prefabricated hole to form a second processed hole; S4: performing metal plating in the first processing hole to form a first hole (2), and performing metal plating in the second processing hole to form a second hole (3).

8. The casing opening method according to claim 7, characterized in that: In step S2, drilling monitoring is performed during the drilling process to ensure that the hole opening position overlaps with the pre-processing position.

9. The casing opening method according to claim 7, characterized in that: The step before S2 includes: removing rust and dirt from the surface of the casing (1); Surface rust removal includes mechanically brushing off the surface rust to obtain a preliminary rust-removed casing; spraying abrasives on the outer surface of the preliminary rust-removed casing for secondary grinding to obtain a secondary processed casing; immersing the secondary processed casing in an acid solution to remove rust through chemical reaction to obtain a casing to be drilled.

10. The casing opening method according to claim 7, characterized in that: Step S4 also includes performing secondary curing on the coating on the surface of the first hole (2) and the coating on the surface of the second hole (3), respectively.

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