Flow guide device, diffuser and centrifugal compressor

Abstract

The present invention relates to a flow guide device, a diffuser and a centrifugal compressor. The flow guide device includes a mounting plate and a blade assembly. One side of the mounting plate has a mounting surface. The blade assembly has an extension direction and is detachably mounted on the mounting surface. Each group of blade assemblies includes at least two splicing parts sequentially assembled along the extension direction, wherein one group of blade assemblies can be constructed with another group of blade assemblies to form an airflow channel. At least one of the at least two splicing parts in each group of blade assemblies can be replaced to change the airflow flow rate in the airflow channel. In this way, when the performance or operating conditions of the centrifugal compressor change, resulting in a change in the internal airflow flow rate, the airflow flow rate that can flow in the airflow channel can be adjusted by the blade assembly, so that the flow guide device provided in this embodiment can provide an airflow channel of appropriate size according to the actual operating conditions of the centrifugal compressor to achieve the best operating conditions and ensure that the compressor operates at a high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal compressors, and in particular to a flow guide device, a diffuser and a centrifugal compressor. Background Art

[0002] As a general-purpose machine, centrifugal compressor is widely used in various national economic fields. Centrifugal compressor is a compressor that uses impeller to work on gas to increase the pressure and speed of gas, complete gas transportation and achieve gas compression.

[0003] In centrifugal compressor technology, the diffuser is a key component for achieving the diffusion function. The diffuser usually adopts a blade type, which forms an air flow channel through the guidance of the blades, thereby achieving diffusion of the gas.

[0004] However, for centrifugal compressors that use blade-type diffusers, the size of the blades is fixed, resulting in a fixed size of the airflow channel created by the diffuser. When the operating conditions of the compressor or the required performance targets change, the flow rate of the airflow that needs to be diffused also changes. The blades of the diffuser cannot be adjusted according to the actual operating conditions to provide an airflow channel of a size that matches them, resulting in reduced efficiency of the compressor during operation. Summary of the invention

[0005] In order to solve the problem that the blade-type diffuser of the existing centrifugal compressor cannot provide an air flow passage of a size matching the gas flow rate according to the actual working conditions, resulting in reduced efficiency of the compressor during operation, the present application proposes a flow guide device, a diffuser and a centrifugal compressor. The flow guide device and the diffuser have the technical effect of adjustable air flow passage size, thereby improving the operating efficiency of the centrifugal compressor.

[0006] A flow guiding device, comprising:

[0007] A mounting plate having a mounting surface on one side;

[0008] The blade assembly has an extension direction, the blade assembly is detachably mounted on the mounting surface, and each set of the blade assembly includes at least two splicing parts sequentially assembled along the extension direction;

[0009] Among them, one group of the blade assemblies can be constructed with another group of the blade assemblies to form an airflow channel, and at least one of the at least two splicing parts in each group of the blade assemblies is replaceable to change the airflow rate in the airflow channel.

[0010] In one embodiment, the at least two splicing parts include a first splicing part and a second splicing part, the first splicing part is an air flow inlet, and the second splicing part is an air flow outlet;

[0011] Wherein, at least one of the first splicing part and the second splicing part in each group of the blade assemblies is replaceable to change the size of the current blade assembly relative to the mounting surface in the length direction and / or width direction and / or height direction.

[0012] In one embodiment, the first splicing portion comprises a plurality of inlet sub-guide vanes, and the plurality of inlet sub-guide vanes can be combined to form at least two first splicing portions of different sizes; and / or

[0013] The second spliced ​​portion includes a plurality of outlet sub-guide vanes, and the plurality of outlet sub-guide vanes can be combined to form the second spliced ​​portion of at least two different sizes.

[0014] In one embodiment, the first joint portion and the second joint portion are both arranged in a water drop shape, and the tips of the water drops are arranged facing away from the adjusting portion.

[0015] In one embodiment, the at least two splicing parts further include an adjusting part assembled between the first splicing part and the second splicing part;

[0016] Wherein, at least one of the first splicing portion, the second splicing portion and the adjusting portion is replaceable to change the size of the current blade assembly relative to the mounting surface in the length direction and / or width direction and / or height direction.

[0017] In one embodiment, the adjustment portion includes a plurality of adjustment blocks, the plurality of adjustment blocks are connected to each other and can be replaceably spliced ​​between the first splicing portion and the second splicing portion;

[0018] Wherein, a plurality of the adjustment blocks can be combined to form the adjustment parts of at least two different sizes.

[0019] In one embodiment, the flow guide device further comprises a plurality of connecting members, the mounting plate is provided with a plurality of first connecting holes, and each of the at least two splicing parts is provided with a second connecting hole;

[0020] Furthermore, each of the connecting members can be inserted into one of the first connecting holes and one of the second connecting holes.

[0021] According to another aspect of the present application, a diffuser is provided, comprising a fixed bottom plate and a flow guide device provided in any one of the above embodiments;

[0022] The fixed bottom plate is provided with a plurality of installation positions, each of which is provided with a flow guide device, and the airflow channel is formed between the blade assemblies of each two adjacent flow guide devices.

[0023] In one embodiment, the mounting position is a mounting slot that penetrates through the fixed base plate, and each mounting plate is rotatably connected to the corresponding mounting slot.

[0024] In one of the embodiments, a plurality of angle positioning portions are provided on the fixed base plate along the circumference of the mounting groove, and a mounting portion is provided on a side of each mounting plate away from the mounting surface, and each mounting portion can be positioned and installed in the angle positioning portion at different positions.

[0025] According to another aspect of the present application, a centrifugal compressor is provided, comprising the diffuser described in any one of the above embodiments.

[0026] The above-mentioned flow guide device can be applied to the diffuser of the centrifugal compressor, the diffuser is used to diffuse the airflow, and the flow guide device is used to guide the airflow. The flow guide device includes a mounting plate and a blade assembly, one side of the mounting plate has a mounting surface, and the blade assembly has an extension direction and is detachably assembled on the mounting surface. Each set of blade assemblies includes at least two splicing parts assembled in sequence along the extension direction, wherein one set of blade assemblies can be constructed with another set of blade assemblies to form an airflow channel, and the airflow can flow in the airflow channel. At least one of the at least two splicing parts in each set of blade assemblies can be replaced to change the airflow flow in the airflow channel. In this way, when the performance or operating conditions of the centrifugal compressor changes, resulting in a change in the internal airflow flow rate, the airflow flow that can flow in the airflow channel is adjusted by adaptively replacing the multiple splicing parts included in each set of blade assemblies, so that the flow guide device provided in this embodiment can provide an airflow channel of appropriate size according to the actual operating conditions of the centrifugal compressor to achieve the best operating conditions and ensure that the compressor has a high operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structural decomposition of a diffuser provided in one embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the exploded structure of one of the flow guide devices in the diffuser provided in;

[0029] Figure 3 for Figure 2 A plan view of the guide device provided in;

[0030] Figure 4 for Figure 1 A cross-sectional schematic diagram of the flow guide device provided in;

[0031] Figure 5 for Figure 2 A schematic diagram of a structural breakdown from a second perspective of the diversion device provided in;

[0032] Figure 6 for Figure 1 A schematic diagram of the structure breakdown of the diffuser from a third perspective provided in;

[0033] Figure 7 for Figure 1 A plan view of an embodiment of a diffuser provided in;

[0034] Figure 8 for Figure 1 A plan view of another embodiment of a diffuser provided in;

[0035] Figure numerals: 100, diffuser; 10, guide device; 11, mounting plate; 111, mounting surface; a, first connecting hole; 112, mounting portion; 12, blade assembly; m: splicing portion; 121, first splicing portion; 122, second splicing portion; 123, adjustment portion; 1231, adjustment block; b: second connecting hole; 13, connecting piece; 20, fixed base plate; 21, mounting position; 211, mounting groove; 22, angle positioning portion. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0037] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0042] See also Figures 1 to 4The present application provides a flow guide device 10, which can be applied to a diffuser 100 of a centrifugal compressor. The diffuser 100 is used to diffuse the airflow in the centrifugal compressor, and the flow guide device 10 is used to guide the airflow in the centrifugal compressor. The flow guide device 10 includes a mounting plate 11 and a blade assembly 12. One side of the mounting plate 11 has a mounting surface 111. The blade assembly 12 has an extension direction and is detachably assembled on the mounting surface 111. Each group of blade assemblies 12 includes at least two splicing parts m assembled in sequence along the extension direction, wherein one group of blade assemblies 12 can be constructed with another group of blade assemblies 12 to form an airflow channel, and the airflow can flow in the airflow channel. At least one of the at least two splicing parts m in each group of blade assemblies 12 can be replaced to change the airflow flow rate in the airflow channel. In this way, when the performance or operating conditions of the centrifugal compressor change, resulting in a change in the internal airflow rate, the airflow rate that can flow in the airflow flow channel is adjusted by adaptively replacing the multiple splicing parts m included in each group of blade assemblies 12, so that the guide device 10 provided in this embodiment can provide a suitable airflow channel according to the actual operating conditions of the centrifugal compressor to achieve the best operating conditions and ensure that the compressor operates at a high efficiency.

[0043] Furthermore, at least one of the replaceable items can be understood as a one-to-one or one-to-many replacement of the replacement object, or can be understood as directly disassembling the replacement object without reinstalling it, thereby changing the airflow rate that can flow in the airflow channel.

[0044] It can be understood that since the guide device 10 provided in this embodiment can provide a suitable airflow channel according to the actual operating conditions of the centrifugal compressor, it is possible to broaden the operating range of the centrifugal compressor, so that the centrifugal compressor can adapt to more working conditions; at the same time, in actual applications, the guide device 10 provided in this embodiment can also adapt to centrifugal compressors with various different airflow flow rates, thereby making the guide device 10 of the present application have a wider scope of application.

[0045] In one embodiment, see Figures 2 to 4 , at least two splicing parts m include a first splicing part 121 and a second splicing part 122, the first splicing part 121 is an air flow inlet, and the second splicing part 122 is an air flow outlet; wherein, at least one of the first splicing part 121 and the second splicing part 122 in each group of blade assemblies is replaceable to change the size of the current blade assembly 12 relative to the mounting surface 111 in the length direction and / or width direction and / or height direction, that is, changing the size of a group of blade assemblies 12 relative to the mounting surface 111 can change the volume of the air flow channel.

[0046] It can be understood that if one of the length, width or height of a group of blade assemblies 12 changes, it can be considered that the size of the group of blade assemblies 12 has changed accordingly. The amount of airflow that can flow through the airflow channel is only related to the size of the blade assembly 12 relative to the mounting surface 111. When the size of the blade assembly 12 changes, the amount of airflow that can flow in the airflow channel will naturally change accordingly.

[0047] In one embodiment, the first splicing part 121 includes a plurality of inlet sub-guide vanes (not shown in the figure), and the plurality of inlet sub-guide vanes can be combined to form at least two different sizes of the first splicing part 121; and / or the second splicing part 122 includes a plurality of outlet sub-guide vanes, and the plurality of outlet sub-guide vanes can be combined to form at least two different sizes of the second splicing part 122, that is, through the adjustment of the plurality of inlet sub-guide vanes and the different combinations of the plurality of outlet sub-guide vanes, the first splicing part 121 and / or the second splicing part 122 of various sizes can be provided and loaded on the mounting plate 11, thereby forming a blade assembly 12 of various sizes. Thus, the flow guiding capacity of the flow guiding device 10 can be adjusted according to the actual operation of the centrifugal compressor, the best aerodynamic performance can be obtained, and the high operation efficiency of the compressor can be ensured.

[0048] Specifically, the first splicing portion 121 and the second splicing portion 122 can also be replaced as a whole to provide at least two sizes of the first splicing portion 121 and the second splicing portion 122, or the number and size of the inlet sub-guide vanes and / or the outlet sub-guide vanes can be adjusted to form a combination of first splicing portions 121 and second splicing portions 122 of various sizes. The specific setting method can be adaptively adjusted as needed, and this application does not limit it.

[0049] In one embodiment, the first splicing portion 121 and the second splicing portion 122 are both arranged in a water drop shape, and the water drop tips of the inlet guide vane and the outlet guide vane are arranged toward the side away from the regulating portion 123, so that the blade assembly 12 forms a low-curvature streamline shape, guides the airflow, prevents airflow diversion, and avoids unnecessary losses caused by the blade assembly 12 during the diffusion process of the diffuser 100.

[0050] In one embodiment, see Figures 2 to 4 , at least two splicing parts m also include an adjusting part 123 assembled between the first splicing part 121 and the second splicing part 122; wherein, at least one of the first splicing part 121, the second splicing part 122 and the adjusting part 123 is replaceable to change the size of the current blade assembly 12 relative to the mounting surface 111 in the length direction and / or width direction and / or height direction, thereby changing the airflow flow rate that can flow in the airflow channel.

[0051] Specifically, see Figure 4The adjusting part 123 includes a plurality of adjusting blocks 1231, which are connected to each other and can be replaceably assembled between the first joint part 121 and the second joint part 122, and the plurality of adjusting blocks 1231 can be combined to form at least two adjusting parts 123 of different sizes, that is, through different combinations of the plurality of adjusting blocks 1231, adjusting parts 123 of various sizes can be provided to be loaded on the mounting plate 11, thereby forming blade assemblies 12 of various sizes. Thus, the flow guiding capacity of the flow guiding device 10 can be adjusted according to the actual operation of the centrifugal compressor, the best aerodynamic performance can be obtained, and the compressor operation efficiency is ensured to be high.

[0052] Specifically, the adjustment parts 123 of various sizes formed by combining multiple adjustment blocks 1231 can be formed by changing the size of the adjustment part 123 in any one of the length direction, width direction or height direction relative to the mounting surface 111. For example, in some embodiments, the size of the adjustment part 123 in the length direction or width direction can be changed by changing the number of adjustment blocks 1231. For example, in some other embodiments, the size of the adjustment block 1231 itself in the length direction, width direction or height direction can be changed to form a combination of adjustment parts 123 of various sizes.

[0053] It can be understood that when the dimension of the blade assembly 12 in the length direction changes relative to the mounting surface 111, it is considered that the length of the airflow channel has changed; when the dimension of the blade assembly 12 in the width direction changes relative to the mounting surface 111, it is considered that the width of the airflow channel has changed; when the dimension of the blade assembly 12 in the height direction changes relative to the mounting surface 111, it is considered that the height of the airflow channel has changed. Therefore, through the above description, the length, width or height of the airflow channel is adjusted, thereby changing the amount of airflow that can flow through the airflow channel.

[0054] Furthermore, since the present application disassembles the complete blade assembly 12 into a plurality of modular parts of different sizes (a plurality of inlet sub-guide vanes, a plurality of outlet sub-guide vanes and a plurality of adjustment blocks 1231), and each modular part of the blade assembly 12 has a simple structure and a small size, the problems of high processing difficulty, long time consumption and high cost of the integrated blade assembly 12 can be solved, which brings great convenience to mass production. At the same time, by modularizing the blade assembly 12, a modular parts standard library can be established, and modular parts suitable for the blade assembly 12 can be selected according to the centrifugal compressors selected for different models, different operating conditions and other conditions, which solves the limitation that the current diffuser 100 can only be used for a single model and a single operating condition, and greatly improves the reuse rate of the blade assembly 12.

[0055] Specifically, the inlet guide vane, the outlet guide vane and the adjustment block 1231 are all made of metal materials. In some embodiments, the adjustment part 123 can also be directly removed, and the inlet guide vane and the outlet guide vane can be directly connected to form a blade assembly 12 with the shortest length direction relative to the mounting surface 111.

[0056] In one embodiment, the guide device 10 also includes a plurality of connecting members 13, a plurality of first connecting holes a are provided on the mounting disk 11, and a second connecting hole b is provided on each of at least two splicing parts m, that is, each adjusting block 1231, the first splicing part 121, and the second splicing part 122 are provided with a second connecting hole b, and each connecting member 13 can be inserted into a first connecting hole a and a second connecting hole b, so that a detachable connection between each adjusting block 1231, the first splicing part 121, the second splicing part 122 and the mounting disk 11 is achieved. In actual application, adjusting blocks 1231, inlet guide vanes, and outlet guide vanes of different sizes are selected according to actual needs for assembly, thereby combining blade assemblies 12 of various sizes for installation, which greatly reduces the processing cost of the diffuser 100 and improves the reusability of the diffuser 100.

[0057] According to another aspect of the present application, see Figures 5 to 8 The present application also provides a diffuser 100 as proposed in the above embodiment, comprising a fixed base plate 20 and a plurality of flow guide devices 10 as described in the above embodiment, wherein a plurality of mounting positions 21 are provided on the fixed base plate 20, each mounting position 21 is provided with a flow guide device 10, and an air flow channel is formed between the blade assemblies 12 of each adjacent two flow guide devices 10. Thus, it can be known from the above discussion that each set of blade assemblies 12 comprises at least two splicing parts m sequentially assembled along the extension direction, wherein one set of blade assemblies 12 can be constructed with another set of blade assemblies 12 to form an air flow channel, and air flow can flow in the air flow channel. At least one of the at least two splicing parts m in each set of blade assemblies 12 can be replaced to change the air flow rate in the air flow channel. In this way, when the performance or operating conditions of the centrifugal compressor change, resulting in a change in the airflow flow rate flowing into the diffuser 100, the airflow flow rate that can flow in the airflow flow channel is adjusted by adaptively replacing the multiple splicing parts m included in each group of blade assemblies 12, so that the diffuser 100 provided in this embodiment can provide a suitable airflow channel according to the actual operating conditions of the centrifugal compressor to achieve the best operating conditions and ensure that the compressor operates at a high efficiency.

[0058] In one of the embodiments, the mounting position 21 is a mounting groove 211 that penetrates through the fixed base plate 20. Each mounting disk 11 is rotatably connected to a corresponding mounting groove 211. The angle of the blade assembly 12 is adjusted by rotating the mounting disk 11 in the mounting groove 211. The angles between two adjacent blade assemblies 12 are different, and the size and shape of the generated airflow channel also change accordingly to achieve the optimal blade angle and airflow angle, which can adapt to different compressors, different working conditions and other conditions to achieve more efficient performance.

[0059] Specifically, a plurality of angular positioning portions 22 are provided on the fixed base plate 20 along the circumference of the mounting groove 211, and a mounting portion 112 is provided on the side of the mounting disk 11 of each guide device 10 that is away from the mounting surface 111. The mounting portion 112 on each guide device 10 can be positioned and installed in the angular positioning portions 22 at different positions, thereby realizing the rotation and positioning of the mounting disk 11 relative to the mounting groove 211.

[0060] In one of the embodiments, the mounting plate 11 is configured to be stepped, and the mounting groove 211 is also configured to be a stepped hole. After the angle of the blade assembly 12 is determined, the mounting portion 112 is positioned and installed in the angle positioning portion 22 of the corresponding angle, thereby achieving adaptive installation of the guide device 10 and the mounting groove 211, making the installation of the diffuser 100 easier, effectively reducing the number of other components used, and simplifying the installation steps of the diffuser 100, thereby improving the assembly accuracy of the diffuser 100.

[0061] Specifically, the mounting portion 112 is a positioning pin connected to the mounting plate 11 , and the angle positioning portion 22 is a positioning hole opened along the circumference of the mounting groove 211 . The positioning pin can be inserted into the corresponding positioning hole, thereby achieving angle adjustment of the blade assembly 12 .

[0062] Furthermore, for the convenience of detection and installation, the second connection hole b on the mounting plate 11 and the positioning hole on the mounting base plate are of the same specification, and the length of the connecting member 13 and the positioning pin are of uniform specification, which is conducive to the convenience of processing, installation and detection.

[0063] According to another aspect of the present application, a centrifugal compressor is provided, including the diffuser 100 provided in any of the above-mentioned embodiments. Since at least one of the at least two splicing parts m in each group of blade assemblies 12 is replaceable, when the performance or operating conditions of the centrifugal compressor change, resulting in changes in the internal air flow rate, air flow channels of different lengths, widths and heights are formed by loading blade assemblies 12 of different sizes on the mounting plate 11, thereby providing an air flow channel and diffusion capacity that matches the actual operating conditions of the centrifugal compressor, thereby making the compressor operate more efficiently.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A flow guide device, characterized in that: include: A mounting plate (11) having a mounting surface (111) on one side; The blade assembly (12) has an extension direction, the blade assembly (12) is detachably mounted on the mounting surface (111), and each group of the blade assembly (12) comprises at least two splicing parts (m) sequentially assembled along the extension direction; Wherein, one group of the blade assemblies (12) can be constructed with another group of the blade assemblies (12) to form an airflow channel, and at least one of the at least two splicing parts (m) in each group of the blade assemblies (12) can be replaced to change the airflow rate in the airflow channel; The at least two splicing parts (m) include a first splicing part (121) and a second splicing part (122), wherein the first splicing part (121) is an air flow inlet, and the second splicing part (122) is an air flow outlet; wherein at least one of the first splicing part (121) and the second splicing part (122) in each group of the blade assemblies (12) is replaceable, so as to change the size of the current blade assembly (12) relative to the mounting surface (111) in the length direction and / or the width direction and / or the height direction.

2. The flow guiding device according to claim 1, characterized in that: The first splicing portion (121) comprises a plurality of inlet sub-guide vanes, and the plurality of inlet sub-guide vanes can be combined to form the first splicing portion (121) of at least two different sizes; and / or The second splicing portion (122) comprises a plurality of outlet sub-guide vanes, and the plurality of outlet sub-guide vanes can be combined to form the second splicing portion (122) of at least two different sizes.

3. The flow guiding device according to claim 1, characterized in that: The at least two splicing parts (m) further include an adjusting part (123) assembled between the first splicing part (121) and the second splicing part (122); At least one of the first splicing portion (121), the second splicing portion (122) and the adjusting portion (123) is replaceable to change the size of the current blade assembly (12) relative to the mounting surface (111) in the length direction and / or width direction and / or height direction.

4. The flow guiding device according to claim 3, characterized in that: The first splicing portion (121) and the second splicing portion (122) are both arranged in a water drop shape, and the tips of the water drops are arranged facing the side away from the adjusting portion (123).

5. The flow guiding device according to claim 3, characterized in that: The adjustment portion (123) comprises a plurality of adjustment blocks (1231), wherein the plurality of adjustment blocks (1231) are connected to each other and are replaceably spliced ​​between the first splicing portion (121) and the second splicing portion (122); Wherein, a plurality of the adjustment blocks (1231) can be combined to form the adjustment parts (123) of at least two different sizes.

6. The flow guiding device according to claim 1, characterized in that: The flow guide device (10) further comprises a plurality of connecting members (13), the mounting plate (11) is provided with a plurality of first connecting holes (a), and each of the at least two splicing parts (m) is provided with a second connecting hole (b); Furthermore, each of the connecting members (13) can be inserted into one of the first connecting holes (a) and one of the second connecting holes (b).

7. A diffuser, comprising a fixed base plate (20) and a plurality of flow guide devices (10) according to any one of claims 1 to 6; The fixed base plate (20) is provided with a plurality of mounting positions (21), each mounting position (21) being provided with a flow guide device (10), and an airflow channel is formed between the blade assemblies (12) of each two adjacent flow guide devices (10).

8. The diffuser according to claim 7, characterized in that The mounting position (21) is a mounting groove (211) extending through the fixed base plate (20), and each mounting plate (11) is rotatably connected to a corresponding mounting groove (211).

9. The diffuser according to claim 8, characterized in that A plurality of angle positioning portions (22) are provided on the fixed base plate (20) along the circumference of the mounting groove (211); a mounting portion (112) is provided on a side of each mounting plate (11) facing away from the mounting surface (111); and each mounting portion (112) can be positioned and installed in an angle positioning portion (22) at a different position.

10. A centrifugal compressor, comprising the diffuser (100) according to any one of claims 7 to 9.

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