An open-type centrifugal compressor impeller and a centrifugal compressor

Abstract

This utility model discloses an open centrifugal compressor impeller and a centrifugal compressor, relating to the field of centrifugal compressor technology. It includes a main shaft, a disc sleeved on the main shaft, several main blades, several branch blades, and a blade diffuser. The blade diffuser is located at the outlet end of the open centrifugal compressor impeller. The number of main blades and branch blades is the same. The main blades are evenly distributed circumferentially on the front surface of the disc. Each branch blade is located between two adjacent main blades and mounted on the front surface of the disc. The thickness of each branch blade is less than the thickness of the main blades. All main blades, all branch blades, and the disc are integrally formed. This utility model has a reasonable design. The branch blades can effectively improve the working capacity of the centrifugal impeller. The smaller and thinner branch blades than the main blades can reduce the blockage area in the impeller flow channel, improve the flow capacity of the compressor, and reduce the impact of the added branch blades on efficiency.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal compressor technology, and more specifically to an open centrifugal compressor impeller and the field of centrifugal compressor technology. Background Technology

[0002] Centrifugal compressors are a type of turbine compressor. Their structure and operating principle are similar to centrifugal blowers, but they are always multi-stage, enabling them to achieve higher gas pressures, larger throughput, and higher efficiency. Turbine compressors with discharge pressures above 0.015 MPa and where the gas flows primarily radially are also called radial flow compressors. Those with discharge pressures below 0.2 MPa are generally called centrifugal blowers. Centrifugal compressors are widely used in various processes to transport air, various process gases, or mixed gases and increase their pressure. Industrially, they are often named according to their application or the type of gas, such as blast furnace blowers and ammonia centrifugal compressors.

[0003] The centrifugal compressor impeller, also known as the impeller, is the only core component in a centrifugal compressor that performs work on the airflow, and is a key power component of industrial fluid machinery. The impeller consists of a disc, a cover, and blades. Through high-speed rotation, the impeller gives energy and a diffusion effect to the gas, thereby increasing its pressure. Existing patents disclose the following technologies: Patent publication number CN113202789A, entitled "Impeller for Centrifugal Compressor and Centrifugal Compressor," discloses the following: An impeller for a centrifugal compressor and a centrifugal compressor. The impeller includes a hub and blades. Each blade includes a blade body and a blade tip winglet, with the blade tip winglet located near the leading edge tip of the blade body. The blade tip winglet extends towards the pressure side and suction side of the blade body. Thus, on the one hand, by utilizing the blade tip winglet, the generation of leakage vortices at the leading edge tip of the high-speed centrifugal impeller can be suppressed or even eliminated, reducing tip leakage losses and thereby improving the aerodynamic performance of the centrifugal compressor. On the other hand, since the blade tip winglet is only located near the leading edge tip of the blade, i.e., in the low linear velocity region of the blade, the adverse effects of the blade tip winglet on the stress of the blade structure are significantly reduced.

[0004] Patent publication number CN112228392A, entitled "Impeller and Centrifugal Compressor," discloses the following: An impeller and centrifugal compressor, wherein the impeller includes a hub and multiple blades, the blades being disposed on the outer circumferential surface of the hub, the multiple blades being spaced apart in the circumferential direction of the hub, and a compression channel being formed between adjacent blades and the hub. The volume of the compression channel gradually decreases in the airflow direction. The compression channel includes an interconnected suction compression section and an intermediate compression section. The suction compression section is formed by the leading edge of the blades and the hub. The volume change rate of the suction compression section is greater than that of the intermediate compression section in the airflow direction. This results in a smaller volume compression when the external fluid first enters the compression channel, avoiding abrupt changes. This reduces flow losses when the fluid enters the compression channel, ensuring compression efficiency, and allowing the impeller size to be controlled within a smaller range for the same cooling capacity requirements.

[0005] Both the aforementioned patented and existing open centrifugal compressor impellers have large blockage areas in the impeller flow channel, resulting in poor flow capacity of the compressor. Utility Model Content

[0006] The purpose of this utility model is to provide an open centrifugal compressor impeller and a centrifugal compressor in order to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution: One aspect of this utility model provides an open centrifugal compressor impeller, including a main shaft, a disc sleeved on the main shaft, a plurality of main blades, a plurality of diverting small blades, and a blade diffuser, wherein the blade diffuser is disposed at the outlet end of the open centrifugal compressor impeller; The number of main blades and the number of diverting blades are the same. Several main blades are evenly distributed on the front of the wheel in a circular pattern. Each diverting blade is located between two adjacent main blades and is installed on the front of the wheel. The thickness of each diverting blade is less than the thickness of the main blade.

[0008] Specifically, the smaller splitter blades can effectively improve the working capacity of the centrifugal impeller. The smaller and thinner splitter blades than the main blades can reduce the blockage area in the impeller flow channel, improve the flow capacity of the compressor, and at the same time reduce the impact of the increased splitter blades on efficiency.

[0009] In one embodiment, the blade diffuser includes a radial diffuser and stationary blades fixed to the radial diffuser for deceleration diffusion.

[0010] In one embodiment, all the main blades and all the branch blades are integrally formed with the wheel disk, and perform work on the gas flowing into the centrifugal compressor as the main shaft rotates.

[0011] In one embodiment, the circumferential position of the impeller diverting blade is set at 40% to 60% of the distance between two adjacent main blades.

[0012] In one embodiment, the blade starting position of each of the impeller splitter blades is located at 45% to 65% of the length of the flow channel along the flow channel axial direction.

[0013] In one embodiment, the leading edge width of each impeller shunting blade is 40% to 70% of the leading edge width of the main blade.

[0014] In one embodiment, the maximum thickness of the diverter blade is 80% to 100% of the maximum thickness of the main blade.

[0015] Another aspect of this utility model provides a centrifugal compressor, including the above-described open centrifugal compressor impeller.

[0016] The beneficial effects of this utility model are as follows: This utility model has a reasonable design. The diversion blades can effectively improve the working capacity of the centrifugal impeller. The diversion blades, which are smaller and thinner than the main blades, can reduce the blockage area in the impeller flow channel, improve the flow capacity of the compressor, and at the same time reduce the impact of the added diversion blades on efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A sectional view; Reference numerals in the attached diagram: 1. Main blade; 2. Diverter blade; 3. Disk; 4. Main shaft. Detailed Implementation

[0019] To make the technical problems, technical solutions, and technical effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Example 1 like Figures 1 to 2 As shown, this embodiment provides an open centrifugal compressor impeller, including a main shaft 4, a disc 3 sleeved on the main shaft 4, a plurality of main blades 1, a plurality of diverting small blades 2, and a blade diffuser, wherein the blade diffuser is disposed at the outlet end of the open centrifugal compressor impeller; The number of main blades 1 and the number of diverting blades 2 are the same. Several main blades 1 are evenly distributed on the front of the wheel disk 3 in a circular pattern. Each diverting blade 2 is located between two adjacent main blades 1 and is installed on the front of the wheel disk 3. The thickness of each diverting blade 2 is less than the thickness of the main blade 1.

[0024] Specifically, the splitter blade 2 can effectively improve the working capacity of the centrifugal impeller. The splitter blade, which is smaller and thinner than the main blade 1, can reduce the blockage area in the impeller flow channel, improve the flow capacity of the compressor, and at the same time reduce the impact of the added splitter blade 2 on efficiency.

[0025] Example 2 like Figures 1 to 2 As shown, this embodiment provides an open centrifugal compressor impeller, including a main shaft 4, a disc 3 sleeved on the main shaft 4, a plurality of main blades 1, a plurality of diverting small blades 2, and a blade diffuser, wherein the blade diffuser is disposed at the outlet end of the open centrifugal compressor impeller; The number of main blades 1 and the number of diverting blades 2 are the same. Several main blades 1 are evenly distributed on the front of the wheel disk 3 in a circular pattern. Each diverting blade 2 is located between two adjacent main blades 1 and is installed on the front of the wheel disk 3. The thickness of each diverting blade 2 is less than the thickness of the main blade 1.

[0026] The blade diffuser includes a radial diffuser and stationary blades fixed on the radial diffuser for deceleration and diffusion.

[0027] All the main blades 1 and all the diverter blades 2 are integrally formed with the disk 3, and perform work on the gas flowing into the centrifugal compressor as the main shaft 4 rotates.

[0028] Example 3 This embodiment is a further optimization based on embodiment 2, specifically: The circumferential position of the impeller splitter blade 2 is set at 40% to 60% of the distance between two adjacent main blades 1.

[0029] The starting position of each impeller splitter blade 2 is located at 45% to 65% of the length of the flow channel along the axial direction of the flow channel.

[0030] The leading edge width of each impeller splitter blade 2 is 40% to 70% of the leading edge width of the main blade 1.

[0031] The maximum thickness of the diversion blade 2 is 80% to 100% of the maximum thickness of the main blade 1.

[0032] Example 4 This embodiment provides a centrifugal compressor, including an open centrifugal compressor impeller as described in any one of embodiments 1 to 3.

Claims

1. An impeller for an open centrifugal compressor, characterized in that, It includes a main shaft (4), a wheel (3) sleeved on the main shaft (4), several main blades (1), several diverter blades (2), and a blade diffuser, wherein the blade diffuser is located at the impeller outlet end of the open centrifugal compressor. The number of main blades (1) and the number of diverting blades (2) are the same. Several main blades (1) are evenly distributed on the front of the wheel disk (3) in a circular pattern. Each diverting blade (2) is located between two adjacent main blades (1) and is installed on the front of the wheel disk (3). The thickness of each diverting blade (2) is less than the thickness of the main blade (1).

2. The impeller of an open centrifugal compressor according to claim 1, characterized in that, The blade diffuser includes a radial diffuser and stationary blades fixed on the radial diffuser for deceleration and diffusion.

3. The impeller of an open centrifugal compressor according to claim 1, characterized in that, All the main blades (1) and all the diverter blades (2) are integrally formed with the disk (3) and perform work on the gas flowing into the centrifugal compressor as the main shaft (4) rotates.

4. The impeller of an open centrifugal compressor according to claim 3, characterized in that, The circumferential position of the impeller splitter blade (2) is set at 40% to 60% of the distance between two adjacent main blades (1).

5. An open centrifugal compressor impeller according to claim 3, characterized in that, The starting position of each impeller splitter blade (2) is located at 45% to 65% of the length of the flow channel along the axial direction.

6. The impeller of an open centrifugal compressor according to claim 3, characterized in that, The tip leading edge width of each of the impeller splitter blades (2) is 40% to 70% of the tip leading edge width of the main blade (1).

7. An open centrifugal compressor impeller according to any one of claims 1 to 6, characterized in that, The maximum thickness of the diversion blade (2) is 80% to 100% of the maximum thickness of the main blade (1).

8. A centrifugal compressor, characterized in that, Includes an open centrifugal compressor impeller according to any one of claims 1 to 7.

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