Variable guide vane structure and centrifugal compressor applying same

Abstract

The utility model relates to the technical field of refrigeration compressors, and provides a variable guide vane structure and a centrifugal compressor with the variable guide vane structure. Comprising a guide vane module, a static ring and guide vanes arranged on the static ring. The U-shaped swing arm comprises a guide vane connecting end and a U-shaped groove, the guide vane connecting end is connected with the U-shaped swing arm, and the U-shaped groove is connected with the driving ring module; the driving ring module is arranged on the guide vane module in a sleeving manner, and comprises a driving ring, a driving ring and a driving shaft; the driving rod is arranged on the driving ring, and the driving rod is configured to drive the driving ring to rotate when rotating; and the sliding wheel is connected with the driving ring, the sliding wheel is arranged in the U-shaped groove, and the sliding wheel is configured to drive the U-shaped swing arm to rotate when the driving ring rotates so as to adjust the angle of the guide vane. According to the variable guide vane structure, the number of parts of the variable guide vane structure and the size of the variable guide vane structure are reduced, so that the variable guide vane structure is more suitable for being used on a high-speed centrifugal compressor with small refrigerating capacity. And meanwhile, a modular design is adopted, so that the assembly difficulty of the variable guide vane structure and the machining precision requirement of parts can be reduced, the overall machining and assembly cost is effectively reduced, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of refrigeration compressors. Specifically, the utility model relates to a variable guide vane structure and a centrifugal compressor applied thereto. Background Art

[0002] The compressor is an important component for realizing the refrigeration cycle. Traditionally, scroll compressors or rotary compressors are usually used in small-capacity refrigeration systems. With the increasing requirements for the reliability of refrigeration systems and compressors, more and more small-capacity refrigeration systems are beginning to choose to use high-speed centrifugal compressors. However, since high-speed centrifugal compressors are equipped with a surge protection system, when the exhaust pressure of the centrifugal compressor reaches a certain value, controlling the minimum flow rate only by adjusting the speed will be limited by the surge line, making it impossible for the high-speed centrifugal compressor to work normally.

[0003] To address the above problems, it is necessary to adjust the angle of the inlet guide vane of the centrifugal compressor to adjust the air intake volume and fluid flow angle of the centrifugal compressor, thereby improving the surge margin of the centrifugal compressor, allowing the centrifugal compressor to operate at a smaller cooling capacity, and improving the refrigeration efficiency of the centrifugal compressor.

[0004] In the prior art, the Chinese invention patent "CN115638132A" discloses an adjustable guide vane of a megawatt-class cryogenic air centrifugal compressor, in which a pneumatic actuator is connected to a drive rod to drive the drive rod to rotate; the drive rod drives the main connecting plate and the drive blade to rotate coaxially; the main connecting plate rotates while driving the rotating ring through the main joint bearing; the rotating ring and the adjustable guide vane holding ring form a cylindrical pair, so that the rotating ring rotates axially and moves in translation; the rotating ring drives 10 driven blades to rotate through the secondary joint bearing and the secondary connecting plate. However, this solution has the problems of a large number of parts in the mechanism for realizing blade rotation, complex assembly, and high manufacturing precision requirements, and a cylindrical pair is used between the rotating ring and the static ring. In order to reduce the friction between the cylindrical pairs, bronze graphite self-lubricating sheets and sleeves are used, which will increase the cost of parts and assembly difficulty.

[0005] The Chinese utility model patent "CN219452514U" discloses an inlet adjustable guide vane for a steam compressor, which includes a housing and a motor, the motor is arranged above the housing, an active rotating rod is installed at the lower end of the motor, a pressing piece is mounted on the surface of the active rotating rod, the active rotating rod passes through the housing, a fixing ring is installed inside the housing, a toothed ring is arranged on the surface of the fixing ring, the toothed ring is divided into a front part and a rear part, an active rotating gear is arranged between the front and rear parts of the toothed ring, and a plurality of driven rotating gears are arranged between the front and rear parts of the toothed ring. However, this scheme adopts a gear structure, which has the problem of high processing accuracy requirements. In addition, when it is used in a centrifugal compressor with a small cooling capacity, due to the small inlet diameter, the meshing surface of the circumferentially arranged active gear, driven gear and toothed ring is reduced, resulting in reduced transmission efficiency, prone to tooth skipping, and in severe cases, the gear pair will fail, the guide vane angle cannot be adjusted, and the high-speed centrifugal compressor will surge, making the centrifugal compressor unable to work. Utility Model Content

[0006] In order to at least partially solve the above problems in the prior art, the present invention proposes a variable guide vane structure, comprising:

[0007] A guide vane module, comprising:

[0008] static ring;

[0009] guide vanes arranged on the stationary ring; and

[0010] A U-shaped swing arm, comprising a guide vane connection end and a U-shaped groove, wherein the guide vane connection end is connected to the guide vane, and the U-shaped groove is connected to the drive ring module; and

[0011] A drive ring module is sleeved on the guide vane module, and the drive ring module comprises:

[0012] Drive ring;

[0013] A drive rod is arranged on the drive ring, wherein the drive rod is configured to

[0014] When rotating, the driving ring is driven to rotate; and

[0015] A sliding wheel is connected to the driving ring and is arranged in the U-shaped groove, wherein the sliding wheel is configured to drive the U-shaped swing arm to rotate when the driving ring rotates, so as to adjust the angle of the guide vane.

[0016] In one embodiment of the present invention, it is provided that a plurality of inner holes are provided on the stationary ring, wherein the guide vanes are arranged on the stationary ring through the inner holes.

[0017] In one embodiment of the present invention, it is provided that the guide vane is connected to the guide vane connecting end of the U-shaped swing arm via a nut or a retaining spring.

[0018] In one embodiment of the utility model, it is provided that the driving ring is provided with a plurality of mounting holes, and the plurality of mounting holes are evenly arranged along the circumference of the driving ring, wherein the sliding wheel is arranged in the mounting holes.

[0019] In one embodiment of the present invention, it is provided that the sliding wheel is arranged in the mounting hole by means of a bolt, wherein the sliding wheel is configured to rotate around the bolt.

[0020] In one embodiment of the utility model, ribs are provided on the inner surface and the end surface of the drive ring, and the ribs are configured to convert the cylindrical friction pair and the plane friction pair between the drive ring and the stationary ring into a line contact friction pair.

[0021] In one embodiment of the present invention, it is provided that the rib is semicircular.

[0022] In one embodiment of the present invention, it is provided that there is a gap between the U-shaped groove and the sliding wheel.

[0023] In one embodiment of the utility model, it is stipulated that a wedge-shaped hole is provided on the guide vane connecting end of the U-shaped swing arm, and the shape of the wedge-shaped hole matches the shape of the rotating shaft of the guide vane so that the rotation angle of the guide vane is consistent with the rotation angle of the U-shaped swing arm.

[0024] The utility model also provides a centrifugal compressor, which has the variable guide vane structure.

[0025] The utility model has at least the following beneficial effects:

[0026] (1) The number of parts of the variable guide vane structure is reduced, and the volume of the variable guide vane structure is reduced, making it more suitable for use on high-speed centrifugal compressors with small refrigeration capacity.

[0027] (2) The modular design can reduce the assembly difficulty of the variable guide vane structure and the machining accuracy requirements of the parts, thereby effectively reducing the overall processing and assembly costs and improving assembly efficiency.

[0028] (3) The friction between the rotating parts is reduced, thereby improving the transmission efficiency, reducing the risk of parts jamming, and improving the reliability of the variable guide vane structure, which can effectively ensure the normal operation of the high-speed centrifugal compressor.

[0029] (4) When there are processing and assembly errors between the drive ring module and the guide vane module, the angle adjustment of the variable guide vane can be achieved, thereby improving the reliability of the high-speed centrifugal compressor.

[0030] (5) The accuracy and consistency of the guide vane adjustment angle are improved, which significantly improves the operating efficiency of the high-speed centrifugal compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To further illustrate the advantages and features of the various embodiments of the present invention, a more detailed description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding components will be represented by identical or similar reference numerals.

[0032] Figure 1A -B shows a schematic structural diagram of a variable guide vane structure in one embodiment of the utility model.

[0033] Figure 2 A schematic diagram of components of a variable guide vane structure in an embodiment of the utility model is shown.

[0034] Figure 3 A schematic diagram of a three-dimensional model of a variable guide vane structure in an embodiment of the utility model is shown.

[0035] Figure 4 The figure shows a schematic structural diagram of a driving ring in an embodiment of the utility model.

[0036] Figure 5 A schematic structural diagram of a U-shaped swing arm in an embodiment of the utility model is shown.

[0037] Reference numerals:

[0038] Drive ring module 101 , guide vane module 102 , drive rod 201 , bolt 202 , sliding wheel 203 , drive ring 204 , stationary ring 205 , U-shaped swing arm 206 , guide vane 207 , nut 208 , mounting hole 401 , rib 402 , U-shaped groove 501 , wedge-shaped hole 502 . DETAILED DESCRIPTION

[0039] It should be noted that the components in the figures may be shown exaggeratedly for the sake of illustration and are not necessarily true to scale. In the figures, identical or functionally identical components are provided with the same reference numerals.

[0040] In the present invention, unless otherwise specified, "arranged on...", "arranged above..." and "arranged above..." do not exclude the existence of an intermediate object between the two. In addition, "arranged on or above..." only indicates the relative positional relationship between two components, and in certain circumstances, such as after reversing the product direction, it can also be converted into "arranged under or below...", and vice versa.

[0041] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0042] In the present invention, unless otherwise specified, the quantifiers "a", "an" and "an" do not exclude the presence of multiple elements.

[0043] It should also be noted that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the components or assemblies may be shown, but those of ordinary skill in the art will understand that under the teachings of the present invention, the required components or assemblies may be added according to the needs of the specific scenario. In addition, unless otherwise specified, the features in different embodiments of the present invention may be combined with each other. For example, a feature in the second embodiment may be used to replace a feature in the first embodiment that corresponds to or has the same or similar functions, and the resulting embodiment also falls within the disclosure scope or recorded scope of the present application.

[0044] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and the like do not mean that the values ​​of the two are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to". By analogy, in the present invention, the terms "perpendicular to", "parallel to", etc. indicating directions also cover the meanings of "substantially perpendicular to" and "substantially parallel to".

[0045] In addition, the numbering of the steps of the methods of the present invention does not limit the execution order of the method steps. Unless otherwise specified, the method steps can be executed in different orders.

[0046] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

[0047] Figure 1A -B shows a schematic diagram of the structure of a variable guide vane structure in one embodiment of the utility model. Figure 1A As shown, the variable guide vane structure includes a drive ring module 101 and a guide vane module 102. Figure 1B As shown, the drive ring module 101 and the guide vane module 102 adopt a modular design. The drive ring module 101 and the guide vane module 102 are assembled separately to improve assembly efficiency. The drive ring module 101 only needs to be put on the guide vane module 102 to complete the assembly of the variable guide vane structure.

[0048] Figure 2 FIG. 1 is a schematic diagram showing a component of a variable guide vane structure in an embodiment of the present utility model. Figure 2As shown, the drive ring module 101 includes a drive rod 201, a bolt 202, a sliding wheel 203 and a drive ring 204, and the guide vane module 102 includes a stationary ring 205, a U-shaped swing arm 206, a guide vane 207 and a nut 208. Since the guide vane module 102 adopts a modular design, the stationary ring 205 can be a separate part or a part of the intake volute of the centrifugal compressor. The guide vane 207 is installed from the inner hole of the stationary ring 205, and the guide vane 207 is fixed to the U-shaped swing arm 206 by an external nut 208 or a retaining ring.

[0049] Figure 3 A schematic diagram of a three-dimensional model of a variable guide vane structure in one embodiment of the utility model is shown below. Figure 3 The working principle of the variable guide vane structure is described in detail. Figure 3 As shown, when the electric actuator (not shown in the figure) drives the driving rod 201 to rotate, the driving ring 204 also rotates with the driving rod 201. The driving ring 204 is provided with a sliding wheel 203, wherein the sliding wheel 203 can be fixed on the driving ring 204 by bolts 202. A U-shaped swing arm 206 is provided on the static ring 205 of the guide vane module 102. The U-shaped swing arm 206 includes a guide vane connection end and a U-shaped groove, wherein the guide vane connection end is connected and fixed with the guide vane 207 by a nut 208, and the sliding wheel 203 is arranged in the U-shaped groove. When the driving ring 204 rotates, the U-shaped swing arm 206 is driven to rotate by the sliding wheel 203, and then the guide vane 207 rotates with the U-shaped swing arm 206. The variable guide vane structure can realize the adjustment of the guide vane angle at the air inlet of the centrifugal compressor, so that the centrifugal compressor can work in the high-efficiency zone under different working conditions, and can increase the surge margin of the centrifugal compressor, so that it can work under low flow and low refrigeration capacity.

[0050] Figure 4 FIG. 2 shows a schematic diagram of the structure of a drive ring in an embodiment of the utility model. Figure 4As shown, a plurality of mounting holes 401 are arranged evenly along the circumference of the driving ring 204, wherein the sliding wheel 203 is mounted on the mounting hole 401 by means of bolts 202, wherein the sliding wheel 203 can rotate around the bolts 202, and when the driving ring 204 rotates, the sliding wheel 203 can drive the U-shaped swing arm 206 to rotate. Since there are both sliding friction and rolling friction between the sliding wheel 203 and the U-shaped swing arm 206, compared with simple sliding friction, the friction loss is smaller and the transmission efficiency is higher. Furthermore, semicircular ribs 402 are provided on the inner surface and end surface of the driving ring 204, and the ribs 402 can transform the original cylindrical friction pair and plane friction pair between the driving ring 204 and the stationary ring 205 into a line contact friction pair, thereby greatly reducing the friction between the driving ring 204 and the stationary ring 205 and improving the transmission efficiency.

[0051] Figure 5 FIG. 2 shows a schematic diagram of the structure of a U-shaped swing arm in one embodiment of the utility model. Figure 5 As shown, the U-shaped swing arm 206 includes a guide vane connection end and a U-shaped groove 501. A gap is reserved between the U-shaped groove 501 and the curved surface of the sliding wheel 203. Even if there is a large assembly error in the axial direction, the U-shaped groove 501 can still maintain good contact with the sliding wheel 203, ensuring that the sliding wheel 203 can drive the U-shaped swing arm 206 to rotate, thereby greatly reducing the machining accuracy requirements of the parts and the assembly accuracy requirements between the various parts, thereby reducing the overall cost of the variable guide vane structure. Further, a wedge-shaped hole 502 is provided on the guide vane connection end of the U-shaped swing arm 206. The shape of the wedge-shaped hole 502 matches the shape of the rotating shaft of the guide vane 207. The wedge-shaped hole 502 is used to accurately position the angle with the rotating shaft plane of the guide vane 207, so that the rotation angle of the guide vane 207 is consistent with the rotation angle of the U-shaped swing arm 206, thereby improving the angle control accuracy and consistency of the guide vane 207.

[0052] In one embodiment of the present invention, a centrifugal compressor is provided, which has the variable guide vane structure.

[0053] Although various embodiments of the utility model are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the utility model. Therefore, the breadth and scope of the utility model disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.

Claims

1. A variable guide vane structure, characterized in that: include: A guide vane module, comprising: static ring; guide vanes arranged on the stationary ring; and A U-shaped swing arm, comprising a guide vane connection end and a U-shaped groove, wherein the guide vane connection end is connected to the guide vane, and the U-shaped groove is connected to the drive ring module; and A drive ring module is sleeved on the guide vane module, and the drive ring module comprises: Drive ring; a drive rod disposed on the drive ring, wherein the drive rod is configured to drive the drive ring to rotate when rotating; and A sliding wheel is connected to the driving ring and is arranged in the U-shaped groove, wherein the sliding wheel is configured to drive the U-shaped swing arm to rotate when the driving ring rotates, so as to adjust the angle of the guide vane.

2. The variable guide vane structure according to claim 1, characterized in that: The stationary ring is provided with a plurality of inner holes, wherein the guide vanes are arranged on the stationary ring through the inner holes.

3. The variable guide vane structure according to claim 2, characterized in that: The guide vane is connected to the guide vane connecting end of the U-shaped swing arm through a nut or a retaining spring.

4. The variable guide vane structure according to claim 1, characterized in that: The driving ring is provided with a plurality of mounting holes, and the plurality of mounting holes are evenly arranged along the circumference of the driving ring, wherein the sliding wheels are arranged in the mounting holes.

5. The variable guide vane structure according to claim 4, characterized in that: The sliding wheel is arranged in the mounting hole by a bolt, wherein the sliding wheel is configured to rotate around the bolt.

6. The variable guide vane structure according to claim 1, characterized in that: Ribs are provided on the inner surface and the end surface of the driving ring, and the ribs are configured to transform the cylindrical friction pair and the plane friction pair between the driving ring and the stationary ring into a line contact friction pair.

7. The variable guide vane structure according to claim 6, characterized in that: The ribs are semicircular.

8. The variable guide vane structure according to claim 1, characterized in that: There is a gap between the U-shaped groove and the sliding wheel.

9. The variable guide vane structure according to claim 1, characterized in that: A wedge-shaped hole is provided on the guide vane connecting end of the U-shaped swing arm, and the shape of the wedge-shaped hole matches the shape of the rotating shaft of the guide vane, so that the rotation angle of the guide vane is consistent with the rotation angle of the U-shaped swing arm.

10. A centrifugal compressor, characterized in that: A variable guide vane structure according to any one of claims 1 to 9.

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