PRV mechanism and centrifugal compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a PRV mechanism capable of adjusting the flow area of an air inlet channel of a centrifugal compressor, the PRV mechanism comprises N groups of transmission components, and each group of transmission components comprises a gear and a blade which are connected with each other; the transmission ring is in engaged connection with the N gears; any gear is in transmission connection with the output end of the driving part, so that the driving part drives the gear, the transmission ring and the other gears to rotate at the same time, the N blades rotate at the same time, the gaps between the adjacent blades are adjusted, and the flow area of the air inlet channel is adjusted. The utility model further provides a centrifugal compressor which comprises a volute assembly and the PRV mechanism, an air inlet channel is arranged in the volute assembly, the N sets of transmission assemblies and the N sets of transmission rings are arranged in the air inlet channel, and the driving piece is arranged outside the volute assembly. The centrifugal compressor uses the PRV mechanism, so that the structural complexity can be reduced, and the assembling and debugging efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a PRV mechanism and a centrifugal compressor. Background Art

[0002] The principle of the PRV mechanism (guide vane mechanism) of a centrifugal compressor is to gradually open or close the air intake channel of the centrifugal compressor as all PRV blades rotate with their respective shafts, thereby achieving energy regulation of the centrifugal compressor. The PRV mechanism usually uses a plurality of annularly arranged PRV blades to form a component. The transmission mechanism of a traditional centrifugal compressor includes a connecting rod mechanism, a worm gear mechanism, a gear rack mechanism, etc. Taking patent CN206419181U as an example, the air intake regulating device of the centrifugal refrigeration centrifugal compressor includes multiple groups of transmission structures, each group of transmission structures includes a swing rod, a pull rod, etc. The structure is relatively complex, the cost is high, and the assembly and debugging process is cumbersome, resulting in low work efficiency.

[0003] Therefore, there is an urgent need for a PRV mechanism and a centrifugal compressor to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to provide a PRV mechanism that can reduce structural complexity and improve assembly and debugging efficiency.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A PRV mechanism is provided, which is capable of adjusting the flow area of ​​an intake passage of a centrifugal compressor, and the PRV mechanism comprises:

[0007] N groups of transmission components, each group of the transmission components includes connected gears and blades, and N is a positive integer greater than or equal to 2;

[0008] A transmission ring, the transmission ring is meshed and connected with the N gears;

[0009] A driving member, any one of the gear transmissions is connected to the output end of the driving member, so that the driving member drives the gear, the transmission ring and the remaining gears to rotate simultaneously, so that the N blades rotate simultaneously, so as to adjust the gap between adjacent blades, so as to adjust the flow area of ​​the intake passage.

[0010] As a preferred solution of the PRV mechanism, the rotation axes of the N blades are located in the same plane, and the rotation axes of the N blades point to the same center.

[0011] As a preferred solution of the PRV mechanism, the rotation axis of the gear of each group of the transmission assembly and the rotation axis of the blade are on a straight line.

[0012] As a preferred solution of the PRV mechanism, one side of the transmission ring is provided with meshing teeth, and the meshing teeth are meshedly connected with the N gears.

[0013] As a preferred solution of the PRV mechanism, it also includes a transmission claw, one end of which is connected to the output end of the driving member, and the other end is provided with a first clamping portion, and each gear is provided with a second clamping portion on the surface away from the blades in the same group, and the first clamping portion can be clamped with the second clamping portion.

[0014] As a preferred solution of the PRV mechanism, each group of the transmission components further includes a locking screw, and the locking screw passes through the central through hole of the gear and is screwed to the blade.

[0015] As a preferred solution of the PRV mechanism, the blade includes a blade body and a connecting rod connected to each other, and the end of the connecting rod away from the blade body is connected to the gear.

[0016] Another object of the utility model is to provide a centrifugal compressor that can reduce structural complexity and improve assembly and debugging efficiency.

[0017] To achieve this purpose, the utility model adopts the following technical solutions:

[0018] A centrifugal compressor is provided, comprising a volute assembly and the above-mentioned PRV mechanism, wherein the volute assembly has an air inlet passage, N groups of transmission assemblies and transmission rings are arranged in the air inlet passage, and a driving member is arranged outside the volute assembly.

[0019] As a preferred solution for the centrifugal compressor, N supporting holes are provided on the volute assembly, and the connecting rods of the blades of the N groups of the transmission assembly can be rotatably inserted into the N supporting holes respectively.

[0020] As a preferred solution for the centrifugal compressor, two limiting protrusions are arranged on each connecting rod at intervals, the diameters of the two limiting protrusions are larger than the inner diameter of the supporting hole, and the portion between the two limiting protrusions is located in the supporting hole.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a PRV mechanism, which drives a gear to rotate through a driving member, the gear drives a transmission ring to rotate, and the transmission ring drives the remaining gears to rotate simultaneously, so that all blades rotate simultaneously to achieve the demand for adjusting the flow area of ​​the intake channel. The PRV mechanism ensures that all gears and blades rotate synchronously through a transmission ring. Compared with PRV mechanisms using other transmission components such as connecting rods, the PRV mechanism is not only simple in structure, but also simpler in assembly and debugging processes, which can improve the efficiency of assembly and debugging.

[0023] The utility model also provides a centrifugal compressor, including a volute assembly and the above-mentioned PRV mechanism, wherein the volute assembly has an air inlet passage, N sets of transmission assemblies and transmission rings are arranged in the air inlet passage, and a driving member is arranged outside the volute assembly. The centrifugal compressor uses the above-mentioned PRV mechanism to reduce structural complexity and improve assembly and debugging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the PRV mechanism provided by the embodiment of the utility model from a first perspective;

[0025] Figure 2 It is a structural schematic diagram of the PRV mechanism provided by the embodiment of the utility model from a second viewing angle;

[0026] Figure 3 It is a partial structural schematic diagram of a centrifugal compressor provided by an embodiment of the utility model;

[0027] Figure 4 It is a partial structural exploded diagram of the centrifugal compressor provided in the embodiment of the utility model.

[0028] In the figure:

[0029] 1. gear; 11. second clamping part; 2. blade; 21. blade body; 22. connecting rod; 221. limiting protrusion; 3. transmission ring; 31. meshing teeth; 4. driving member; 5. transmission claw; 51. first clamping part; 6. locking screw;

[0030] 100. PRV mechanism; 200. volute assembly; 2001. support hole. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] like Figure 1-Figure 2 As shown, the PRV mechanism 100 of this embodiment is capable of adjusting the flow area of ​​the intake passage of the centrifugal compressor. The PRV mechanism 100 includes a transmission ring 3, a driving member 4 and N groups of transmission components, where N is a positive integer greater than or equal to 2. Each group of transmission components includes a connected gear 1 and blades 2, and the transmission ring 3 is meshed with the N gears 1. Any gear 1 is transmission-connected to the output end of the driving member 4, so that the driving member 4 drives the gear 1, the transmission ring 3 and the remaining gears 1 to rotate simultaneously, so that the N blades 2 rotate simultaneously, so as to adjust the gap between adjacent blades 2, so as to adjust the flow area of ​​the intake passage. Optionally, the driving member 4 is a motor.

[0035] The PRV mechanism 100 drives a gear 1 to rotate through a driving member 4, and the gear 1 drives a transmission ring 3 to rotate, and the transmission ring 3 drives the remaining gears 1 to rotate simultaneously, so that all blades 2 rotate simultaneously to achieve the demand for adjusting the flow area of ​​the intake passage. The PRV mechanism 100 ensures that all gears 1 and blades 2 rotate synchronously through a transmission ring 3. Compared with PRV mechanisms using other transmission components such as connecting rods, the PRV mechanism 100 is not only simple in structure, but also simpler in assembly and debugging processes, which can improve the efficiency of assembly and debugging.

[0036] Optionally, in this embodiment, N is 9. Of course, in other embodiments, the value of N can be adjusted according to the actual size and parameters of the centrifugal compressor, and is not limited here.

[0037] Optionally, the size of each blade 2 is close to the size of 1 / N of a circle, so that the air intake passage can be approximately closed when adjacent blades 2 are connected in sequence. In this embodiment, when adjacent blades 2 are connected in sequence, an approximately circular gap is reserved at the center, and adjacent blades 2 are stacked in sequence, that is, there is a small amount of overlapping area on the sides of adjacent blades 2, and since the rotation directions of the N blades 2 are consistent, no interference occurs.

[0038] Preferably, the rotation axes of the N blades 2 are located in the same plane and point to the same center. A simulated circle is drawn with the center as the center, and the rotation axes of the N blades 2 extend along the radial direction of the circle. Optionally, the N blades 2 have the same size and shape.

[0039] Preferably, the rotation axis of the gear 1 and the rotation axis of the blade 2 of each transmission assembly are on a straight line, that is, the gear 1 and the blade 2 rotate coaxially, and the rotation angles of the two are consistent.

[0040] Preferably, one side of the transmission ring 3 is provided with meshing teeth 31, and the meshing teeth 31 are meshed and connected with the N gears 1. Optionally, the line connecting the center of the transmission ring 3 and the center of the simulated circle coincides with the center line of the air intake passage.

[0041] Preferably, the PRV mechanism 100 also includes a transmission claw 5, one end of which is connected to the output end of the driving member 4, and the other end is provided with a first clamping portion 51. A second clamping portion 11 is provided on the surface of each gear 1 away from the same group of blades 2, and the first clamping portion 51 can be clamped with the second clamping portion 11 to ensure stable transmission between the two.

[0042] Optionally, the transmission claw 5 rotates coaxially with the gear 1. In this embodiment, the first clamping portion 51 is a waist-shaped protrusion, and the second clamping portion 11 is a waist-shaped groove. In other embodiments, one of the first clamping portion 51 and the second clamping portion 11 is a plurality of eccentrically arranged clamping protrusions, and the other is a plurality of eccentrically arranged clamping grooves, and the plurality of clamping protrusions and the plurality of clamping grooves are arranged one by one.

[0043] Preferably, each transmission assembly further comprises a locking screw 6 , which passes through the central through hole of the gear 1 and is screwed to the blade 2 to ensure a firm connection between the gear 1 and the blade 2 .

[0044] Preferably, the blade 2 comprises a blade body 21 and a connecting rod 22 which are connected to each other, and an end of the connecting rod 22 away from the blade body 21 is connected to the gear 1 .

[0045] like Figure 3-Figure 4As shown, this embodiment also provides a centrifugal compressor, which includes a volute assembly 200 and the above-mentioned PRV mechanism 100, the volute assembly 200 has an air intake passage, N groups of transmission assemblies and transmission rings 3 are arranged in the air intake passage, and the driving member 4 is arranged outside the volute assembly 200.

[0046] Preferably, N supporting holes 2001 are provided on the volute assembly 200, and the connecting rods 22 of the blades 2 of the N groups of transmission assemblies can be rotatably inserted into the N supporting holes 2001 respectively, so as to fix the positions of the N groups of transmission assemblies and prevent misalignment that causes the blades 2 to fail to dock and close well, or the gear 1 to fail to mesh well with the transmission ring 3.

[0047] Preferably, two limiting protrusions 221 are arranged at intervals on each connecting rod 22 , the diameters of the two limiting protrusions 221 are larger than the inner diameter of the supporting hole 2001 , and the portion between the two limiting protrusions 221 is located in the supporting hole 2001 to prevent the blade 2 from moving along the length direction of the connecting rod 22 .

[0048] Optionally, a limiting wall is provided in the volute assembly 200 , and the opposite side of the meshing teeth 31 of the transmission ring 3 abuts against the limiting wall to prevent the transmission ring 3 from disengaging from the gear 1 .

[0049] The centrifugal compressor uses the above-mentioned PRV mechanism 100, which can greatly reduce the complexity of the structure and improve the efficiency of assembly and debugging. Taking assembly as an example, first, the transmission ring 3 is sleeved on the support of the volute assembly 200, and the N blades 2 are respectively inserted in the N support holes 2001, and then the N gears 1 are respectively fastened together with the N blades 2 by locking screws 6. There is no error-proofing requirement for the installation position, and it is sufficient to ensure that the N blades 2 are all in a closed state. Check that all gears 1 are meshed and connected with the transmission ring 3, and then connect the support with other components of the volute assembly 200 to complete the assembly. The adjustment of the PRV mechanism 100 is also relatively simple. When the module of the gear 1 increases, the adjustment will be more precise and simple. In addition, the multiple gears 1 in the PRV mechanism 100 are meshed and connected with the meshing teeth 31 of the transmission ring 3, and the two restrict each other, so there will be no gap swing, and the locking effect is relatively good. In short, the PRV mechanism 100 has low cost, simple structure and easy assembly.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. PRV mechanism, characterized in that: The PRV mechanism (100) is capable of adjusting the flow area of ​​an intake passage of a centrifugal compressor, and comprises: N groups of transmission components, each group of the transmission components comprises a gear (1) and a blade (2) connected to each other, and N is a positive integer greater than or equal to 2; A transmission ring (3), wherein the transmission ring (3) is meshingly connected with the N gears (1); A driving member (4), any one of the gears (1) is drivingly connected to an output end of the driving member (4), so that the driving member (4) drives the gear (1), the transmission ring (3) and the remaining gears (1) to rotate simultaneously, so that the N blades (2) rotate simultaneously, so as to adjust the gap between adjacent blades (2), so as to adjust the flow area of ​​the air intake passage; The blade (2) comprises a blade body (21) and a connecting rod (22) connected to each other. The end of the connecting rod (22) away from the blade body (21) is connected to the gear (1). Two limiting protrusions (221) are arranged at intervals on each of the connecting rods (22). N supporting holes (2001) are opened on the volute assembly (200). The connecting rods (22) of the blades (2) of the N groups of the transmission assembly can be rotatably inserted into the N supporting holes (2001). The diameters of the two limiting protrusions (221) are both larger than the inner diameter of the supporting hole (2001), and the portion between the two limiting protrusions (221) is located in the supporting hole (2001).

2. The PRV mechanism according to claim 1, characterized in that: The rotation axes of the N blades (2) are located in the same plane, and the rotation axes of the N blades (2) point to the same center.

3. The PRV mechanism according to claim 1, characterized in that: The rotation axis of the gear (1) and the rotation axis of the blade (2) of each group of the transmission components are on a straight line.

4. The PRV mechanism according to any one of claims 1 to 3, characterized in that: One side of the transmission ring (3) is provided with meshing teeth (31), and the meshing teeth (31) are meshingly connected with the N gears (1).

5. The PRV mechanism according to any one of claims 1 to 3, characterized in that: It also comprises a transmission claw (5), one end of which is connected to the output end of the driving member (4), and the other end of which is provided with a first clamping portion (51); a second clamping portion (11) is provided on a surface of each gear (1) away from the blades (2) in the same group, and the first clamping portion (51) can be clamped with the second clamping portion (11).

6. The PRV mechanism according to any one of claims 1 to 3, characterized in that: Each group of the transmission components also includes a locking screw (6), and the locking screw (6) passes through the central through hole of the gear (1) and is screwed to the blade (2).

7. A centrifugal compressor, characterized in that: It comprises a volute assembly (200) and a PRV mechanism as described in any one of claims 1 to 6, wherein the volute assembly (200) has an air intake passage, N groups of transmission assemblies and transmission rings (3) are arranged in the air intake passage, and a driving member (4) is arranged outside the volute assembly (200).

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