A switchable diffuser

Abstract

This utility model provides a switchable diffuser, comprising: a chassis, a plurality of blades, and a fixing column. The chassis has a first bottom surface and a first top surface, and a through hole is provided on the chassis for the blades to pass through. Each blade has a second bottom surface, and a magnet is connected to the end of the blade away from the second bottom surface. The fixing column is provided with an inner cavity, and a variable magnet is installed on the top of the inner cavity. The diffuser also includes a controller, which controls the change of the magnetic direction of the variable magnet to achieve repulsion and attraction of the magnet, thereby driving the blades to move upward and downward in the through hole of the chassis.

Description

Technical Field

[0001] This application relates to the field of centrifugal compressor diffusers, and more particularly to a switchable diffuser. Background Technology

[0002] The diffuser, a key component of a centrifugal compressor, is located immediately after the impeller outlet. It comes in two structural types: bladeless diffusers and bladed diffusers. The working principle of bladeless diffusers is the same as that of bladed diffusers: the gas velocity decreases as it passes through the diffuser, reducing kinetic energy and converting it into pressure energy, thus increasing static pressure. Although bladeless diffusers are simpler in structure and lower in cost, their diffusion degree is smaller than that of bladed diffusers, resulting in a longer gas flow path and greater frictional losses; however, they exhibit good performance under varying operating conditions.

[0003] Although bladed diffusers have a large diffusion degree and are 3%-5% more efficient than bladeless diffusers under design conditions, under varying operating conditions, changes in the magnitude and direction of the inlet airflow velocity impact the bladed diffuser, thereby increasing inlet losses, reducing flow rate, and making it prone to surge. Conversely, increased flow rate can easily lead to blockage, resulting in a relatively small stable operating range.

[0004] In summary, in practical applications of compressors, bladeless diffusers are generally selected to increase adaptability to varying operating conditions. Under design operating conditions, bladed diffusers are selected.

[0005] Traditional diffusers, whether bladeless or bladed, cannot be changed after production. The choice between bladeless and bladed diffusers depends on the operating conditions.

[0006] Current technologies attempt to design diffusers that can switch between bladeless and bladed configurations using pneumatic propulsion. However, these diffusers have numerous components and complex pneumatic air passage processing, resulting in high manufacturing costs. Utility Model Content

[0007] Based on the above-mentioned shortcomings, this patent provides a switchable diffuser that can freely switch between a bladeless diffuser and a blade diffuser. Under the design operating conditions, the compressor operates in the form of a blade diffuser, and under the variable operating conditions, it operates in the form of a bladeless diffuser.

[0008] This application provides a switchable diffuser, comprising: a chassis, a plurality of blades, and a fixing column. The chassis is disc-shaped, and the plurality of blades are arranged centrally symmetrically with respect to the central axis of the chassis. The chassis has a first bottom surface and a first top surface, and the chassis has through holes equal in number to the number of blades, through which the blades can pass. Each blade has a second bottom surface, and a magnet is connected to the end of the blade away from the second bottom surface. The fixing column has an inner cavity, and a variable magnet is installed on the top of the inner cavity. The diffuser also includes a controller, which controls the change of the magnetic direction of the variable magnet to achieve repulsion and attraction, thereby driving the blades to move upward and downward in the through holes of the chassis.

[0009] When the variable magnet has the opposite magnetic properties to the magnet, the variable magnet and the magnet attract each other and come into contact, and the second bottom surface of the blade is flush with the first bottom surface of the chassis.

[0010] When the variable magnet has the same magnetic properties as the magnet, the variable magnet and the magnet repel each other and move away from each other, and the end face of the magnet near the blade abuts against the first top surface of the chassis.

[0011] The fixed column has slots on both sides. When the variable magnet attracts and contacts the magnet, the slots are used to accommodate the blade.

[0012] Preferably, the magnet is cylindrical.

[0013] Preferably, the variable magnet is cylindrical.

[0014] Preferably, the fixed column is provided with a magnet mounting position for mounting a variable magnet.

[0015] Preferably, the bottom of the fixing post is provided with a connecting lug, and the connecting lug has a connecting hole. The connecting lug of the fixing post is connected to the chassis by a fixing member, which passes through the connecting hole to fix the connecting lug to the chassis.

[0016] Preferably, the chassis has a through hole with the same shape as the blade at the corresponding position, and the blade can extend or retract freely in this hole.

[0017] Preferably, the inner wall of the cavity of the fixing column is smooth enough to allow the magnet on the blade to slide freely.

[0018] The switchable diffuser described in this application has the following advantages: By controlling the magnetic direction of the variable magnet through a controller, and utilizing the principle of attraction between like poles and repulsion between unlike poles, the axial extension or retraction of each blade can be controlled simultaneously. That is, like poles attract when the blades retract, and repulsion causes them to extend, thus achieving the switching between a bladeless diffuser and a bladed diffuser. The switchable diffuser of this application features a simple and ingenious design while ensuring stable performance, overcoming the drawbacks of complex and costly gas pressure duct manufacturing.

[0019] In this application's switchable diffuser, when the variable magnet has the opposite magnetic properties to the main magnet, the variable magnet attracts and contacts the main magnet, and the second bottom surface of the blade is flush with the first bottom surface of the chassis. When the variable magnet has the same magnetic properties as the main magnet, the variable magnet repels and moves away from the main magnet, and the end face of the magnet near the blade abuts against the first top surface of the chassis. This design is compact and ensures high performance stability of the diffuser during operation. Attached Figure Description

[0020] Figure 1 This is a top view of the switchable diffuser of this application;

[0021] Figure 2 This is a structural schematic diagram of the switchable diffuser of this application;

[0022] Figure 3 This is a bottom view of the switchable diffuser of this application;

[0023] Figure 4 This is a side view of the switchable diffuser of this application in the bladeless state;

[0024] Figure 5 This is a schematic diagram of the switchable diffuser of this application in the bladed state;

[0025] Figure 6 This is a schematic diagram of the blades of the switchable diffuser of this application;

[0026] Figure 7 This is a cross-sectional view of the blade position of the switchable diffuser of this application in the bladeless state;

[0027] Figure 8 This is a cross-sectional view of the blade position of the switchable diffuser of this application in the bladed state.

[0028] Explanation of reference numerals in the attached drawings: 1-diffuser, 2-chassis, 3-blade, 31-magnet, 4-fixed column, 41-inner cavity, 5-variable magnet. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] To simplify the disclosure of this invention, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0031] Example

[0032] like Figures 1-8 As shown, a switchable diffuser 1 includes: a chassis 2, a plurality of blades 3, and a fixing post 4. The chassis 2 is disc-shaped, and the plurality of blades 3 are arranged centrally symmetrically with respect to the central axis of the chassis 2. The chassis 2 has a first bottom surface and a first top surface, and the chassis 2 has through holes in the same number as the number of blades 3, through which the blades 3 can pass. The blades 3 have a second bottom surface, and a magnet 31 is connected to the end of the blade 3 away from the second bottom surface. The fixing post 4 is provided with an inner cavity 41, and a variable magnet 5 is installed on the top of the inner cavity 41. The diffuser also includes a controller, which controls the change of the magnetic direction of the variable magnet 5 to achieve repulsion and attraction to the magnet 31, thereby driving the blades 3 to move upward and downward in the through holes of the chassis 2.

[0033] When the magnetic properties of the variable magnet 5 and the magnet 31 are opposite, the variable magnet 5 and the magnet 31 attract each other and come into contact, and the second bottom surface of the blade 3 is flush with the first bottom surface of the chassis 2.

[0034] When the variable magnet 5 and the magnet 31 have the same magnetism, the variable magnet 5 and the magnet 31 repel each other and move away from each other, and the end face of the magnet 31 near the blade 3 abuts against the first top surface of the chassis 2.

[0035] The fixed column 4 has slots on both sides. When the variable magnet 5 and the magnet 31 attract each other and come into contact, the slots are used to accommodate the blade 3. The magnet 31 is cylindrical, the variable magnet 5 is cylindrical, and the fixed column 4 has a magnet mounting position for mounting the variable magnet 5.

[0036] The inner cavity 41 of the fixing post 4 has a smooth inner wall surface, and the bottom of the fixing post 4 is provided with a connecting lug, which has a connecting hole. The connecting lug of the fixing post 4 is connected to the chassis 2 by a fixing member, which passes through the connecting hole to fix the connecting lug to the chassis 2.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A switchable diffuser, the diffuser (1) comprising: The chassis (2), several blades (3), and fixed column (4) are characterized by: The chassis (2) is disc-shaped, and the plurality of blades (3) are arranged in a centrally symmetrical manner with respect to the central axis of the chassis (2); The chassis (2) has a first bottom surface and a first top surface. The chassis (2) has the same number of through holes as the blades (3). The blades (3) can pass through the corresponding through holes on the chassis (2). The blade (3) has a second bottom surface, and a magnet (31) is connected to one end of the blade (3) away from the second bottom surface; the fixing column (4) is provided with an inner cavity (41), and a variable magnet (5) is installed on the top of the inner cavity (41); The diffuser also includes a controller that controls the change of the magnetic direction of the variable magnet (5) to achieve repulsion and attraction to the magnet (31), thereby driving the blade (3) to move upward and downward in the through hole of the chassis (2).

2. The switchable diffuser of claim 1, wherein: When the magnetic properties of the variable magnet (5) and the magnet (31) are opposite, the variable magnet (5) and the magnet (31) attract each other and come into contact and combine, and the second bottom surface of the blade (3) is flush with the first bottom surface of the chassis (2).

3. The switchable diffuser of claim 1, wherein: When the variable magnet (5) and the magnet (31) have the same magnetism, the variable magnet (5) and the magnet (31) repel each other and move away from each other, and the end face of the magnet (31) near the blade (3) abuts against the first top surface of the chassis (2).

4. The switchable diffuser of claim 1, wherein: The inner cavity (41) has a smooth inner wall surface.

5. The switchable diffuser of claim 2, wherein: The fixed column (4) has slots on both sides. When the variable magnet (5) and the magnet (31) attract each other and come into contact, the slots are used to accommodate the blade (3).

6. The switchable diffuser of claim 1, wherein: The bottom of the fixed column (4) is provided with a connecting ear, and the connecting ear is provided with a connecting hole.

7. The switchable diffuser of claim 6, wherein: The connecting ear is connected to the chassis (2) by a fastener, which passes through the connecting hole to fix the connecting ear to the chassis (2).

8. The switchable diffuser of claim 1, wherein: The magnet (31) is cylindrical.

9. The switchable diffuser of claim 8, wherein: The variable magnet (5) is cylindrical.

10. The switchable diffuser of claim 8, wherein: The fixed column (4) is provided with a magnet mounting position for mounting the variable magnet (5).

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