Split type flow guide ring and centrifugal compressor

Abstract

The utility model discloses a split type flow guide ring and a centrifugal compressor, and belongs to the technical field of centrifugal compressors, the split type flow guide ring comprises a front flow guide body and a rear flow guide body, and the front flow guide body is located on the front side of the rear flow guide body; a flow guide cavity is formed in the front flow guide body, and an impeller cavity is formed in the rear flow guide body and communicated with the flow guide cavity. The front flow guide body and the rear flow guide body are made of different materials; the centrifugal compressor comprises a volute, an impeller and the flow guide ring. The flow guide ring extends into the volute, the front flow guide body is connected with the volute in a sealed mode, and the rear flow guide body is located between the impeller and the volute. Due to the split design of the flow guide ring, the front flow guide body and the rear flow guide body can be made of different materials, production cost control and corrosion resistance improvement of the flow guide ring are both considered, and application of the compressor is more flexible.

Description

Technical Field

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

[0002] The guide ring is a crucial compressor component, used to guide incoming gas to the impeller for compression. Currently, guide rings are typically manufactured in one piece through casting. Due to process limitations, the entire ring is made of a uniform material. When operating conditions require high corrosion resistance, stainless steel is often used. However, using stainless steel throughout increases costs and is unnecessary waste, while also leading to long casting times. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a split guide ring and a centrifugal compressor. The guide ring adopts a split design and uses different materials to take into account both cost and corrosion resistance. The guide ring has a reasonable structure, and the assembly operation of the centrifugal compressor is simple and has strong versatility.

[0004] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0005] On the one hand, the utility model provides a split guide ring, comprising a leading fluid guide and a trailing fluid guide, wherein the leading fluid guide is located in front of the trailing fluid guide;

[0006] A guide cavity is formed in the leading fluid, an impeller cavity is provided in the trailing fluid, and the impeller cavity and the guide cavity are in communication;

[0007] The leading fluid and the trailing fluid are made of different materials.

[0008] In the above-mentioned split guide ring, a mounting groove is provided on the outer side wall of the rear end portion of the leading guide body, and a plurality of through-holes are provided on the rear side wall of the mounting groove; a plurality of connecting holes are provided on the front end surface of the trailing guide body, and the leading guide body and the trailing guide body are connected by connecting members placed from the mounting groove into the through-holes and the connecting holes;

[0009] And / or, the mounting groove is annular and extends along the entire circumference of the leading fluid.

[0010] In the above-mentioned split guide ring, a convex positioning platform is provided on the front end surface of the rear guide body, and the rear end surface of the front guide body is partially concave to form a positioning part, and the positioning part cooperates with the positioning platform to assemble and position the rear guide body and the front guide body.

[0011] In the above-mentioned split guide ring, the positioning platform is an annular boss and is close to the impeller cavity; the positioning portion is a circular hole and is connected to the guide cavity, and the outer circumferential surface of the positioning platform and the hole wall of the positioning portion cooperate for positioning.

[0012] On the other hand, the utility model provides a centrifugal compressor, including a volute and an impeller; also including the above-mentioned guide ring; the guide ring extends into the volute and the leading fluid is sealed with the volute, and the trailing fluid is located between the impeller and the volute.

[0013] In the above-mentioned centrifugal compressor, a volute connecting platform is provided on the outer side wall of the leading fluid, and the front end of the volute is connected to the volute connecting platform.

[0014] In the above-mentioned centrifugal compressor, the volute connecting platform is an annular platform;

[0015] And / or, an adjustment gasket is provided between the front end surface of the volute and the volute connecting platform.

[0016] In the above-mentioned centrifugal compressor, a sealing ring is provided between the volute and the leading fluid.

[0017] In the above-mentioned centrifugal compressor, a sealing groove is provided on the outer wall of the leading fluid, the volute connecting platform is located in front of the mounting groove, and the sealing groove is located between the volute connecting platform and the mounting groove; the sealing ring is located in the sealing groove.

[0018] In the above-mentioned centrifugal compressor, there is a first gap between the circumferential surface of the rear end of the trailing guide fluid and the circumferential surface of the impeller blade, and the first gap is greater than 1 mm;

[0019] And / or, a fourth interval is provided between the front end surface of the trailing guide body and the front end surface of the impeller blade, and the fourth interval is greater than 2 mm.

[0020] The beneficial effects of the present invention are as follows:

[0021] The guide ring is assembled from the front guide fluid and the rear guide fluid. The split design allows the front and rear guide fluids to be made of different materials, taking into account both the production cost control and the improvement of corrosion resistance of the guide ring.

[0022] At the same time, in terms of structure, the leading fluid of the guide ring is connected and sealed to the volute. This structural solution allows the assembly of the guide ring and the volute to continue using the original integrated structure assembly tooling, which is simple to assemble and conducive to standardized mass production.

[0023] The split guide ring makes the compressor more flexible in application. By changing the thickness of the adjustment gasket, the gap between the rear guide body and the impeller can be adjusted, or the profile of the impeller cavity of the rear guide body can be adjusted to meet different speed conditions of the centrifugal compressor.

[0024] A set gap is reserved between the impeller inlet and outlet ends and the rear guide body to reduce flow loss and improve the working efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the centrifugal compressor of the present utility model;

[0026] Figure 2 for Figure 1 Enlarged view of area A in the middle;

[0027] Figure 3 for Figure 2 Enlarged view of area C in the middle;

[0028] Figure 4 for Figure 2 Magnified view of area D in the middle.

[0029] In the picture:

[0030] 1-leading fluid; 101-flow chamber; 102-volute connection platform; 103-sealing groove; 104-mounting groove; 105-positioning part;

[0031] 2-rear guide fluid; 201-impeller cavity; 202-positioning platform;

[0032] 3-Impeller; 4-Voltage; 5-Adjusting gasket; 6-Sealing ring;

[0033] W1 - first gap; W2 - second gap; W3 - third gap; W4 - fourth gap. DETAILED DESCRIPTION

[0034] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0035] First, please refer to Figures 1-4 , is an embodiment of a split guide ring provided by the utility model, comprising a leading fluid guide 1 and a trailing fluid guide 2; wherein, an impeller cavity 201 is provided in the trailing fluid guide 2, a guide cavity 101 is formed in the leading fluid 1, the impeller cavity 201 is communicated with the guide cavity 101, and the air flow is guided through the guide cavity 101 into the impeller cavity 201.

[0036] In order to clearly and briefly describe the structure of the guide ring, it is assumed that the upstream of the leading fluid guide 1 and the trailing fluid guide 2 is the front, and the downstream is the rear, based on the airflow direction within the guide ring. The leading fluid guide 1 is located in front of the trailing fluid guide 2, and the two are connected and fixed as a whole.

[0037] The outer wall at the rear end of the leading fluid guide 1 is provided with a mounting groove 104 that is concave inward. The mounting groove 104 can be designed to be annular and extend along the entire circumference of the leading fluid guide 1. As needed, the mounting groove 104 can also be a groove distributed in a dotted manner, with multiple grooves provided around the circumference of the leading fluid guide 1. The rear wall of the mounting groove 104 is provided with a number of through-portions that extend along the axial direction of the guide ring and penetrate the rear end face of the leading fluid guide 1. The through-portions can be through holes, and the cross-section of the through-portions is not limited to a circle. The through-portions can also be a groove-like structure with openings on both the rear wall of the mounting groove 104 and the rear end face of the leading fluid guide 1, such as a U-shaped groove or a groove with other cross-sectional shapes. The front end face of the rear fluid guide 2 is provided with a number of connecting holes that correspond to the positions of the connecting holes. The leading fluid guide 1 and the rear fluid guide 2 are connected by connecting parts such as bolts located in the through-portions and the connecting holes. Depending on the connection requirements of the connector, the connection hole can be a threaded hole or a plain hole. For example, when the connector is a bolt, screw, or other part connected by threads, the connection hole is a threaded hole. When the connector is a pin, the connection hole is a plain hole, and the connection is achieved through an interference fit. When there are multiple mounting grooves 104 and they are distributed in a dotted manner on the circumference of the leading fluid guide 1, the number of mounting grooves 104 is preferably consistent with the number of the connecting threaded holes, and the positions of the mounting grooves 104 and the connecting threaded holes correspond one to one. When assembling the leading fluid guide 1 and the rear fluid guide 2, first place the bolt from the mounting groove 104 into the through portion, and then tighten the bolt to the connecting hole using a tool such as a wrench.

[0038] In this solution, both the leading fluid 1 and the trailing fluid 2 abut against the inner wall of the volute 4, and the force is more evenly distributed, which effectively reduces the vibration of the guide ring and effectively prevents the wear of the impeller 3 caused by the reduction of the distance with the impeller 3 due to vibration.

[0039] The mounting groove 104 is preferably an annular groove, which is convenient for processing and assembly operations, while saving the material usage of the guide fluid 1, saving costs, and reducing the overall weight of the guide ring.

[0040] For further information, please refer to Figure 3 The front end face of the rear guide fluid 2 is provided with an outwardly convex and axially extending positioning platform 202, and the rear end face of the front guide fluid 1 is partially concave to form a positioning portion 105. The positioning portion 105 cooperates with the positioning platform 202 to position the assembly of the rear guide fluid 2 and the front guide fluid 1.

[0041] As an implementation manner of the positioning platform 202 , the positioning platform 202 is an annular boss, and the positioning portion 105 is an annular groove, and the annular boss cooperates with the annular groove for positioning.

[0042] In another embodiment of positioning platform 202, positioning platform 202 is an annular boss positioned adjacent to impeller chamber 201. Positioning portion 105 is a circular hole connected to diversion chamber 101. The outer circumferential surface of positioning platform 202 and the hole wall of positioning portion 105 cooperate for positioning. Positioning platform 202 and positioning portion 105 in this embodiment are easy to manufacture and require only precise control of the outer circumferential surface of positioning platform 202 and the hole wall of positioning portion 105.

[0043] After assembly is completed, the annular positioning platform 202 and the positioning portion 105 block the escape of gas through the connection surface of the leading fluid guide 1 and the trailing fluid guide 2, thereby ensuring good sealing and efficiency.

[0044] Preferably, the leading fluid 1 and the trailing fluid 2 are made of different materials to balance production costs and the corrosion resistance of the product. The trailing fluid 2 is made of a metal material with higher corrosion resistance than the leading fluid 1. For example, the leading fluid 1 is made of ordinary structural steel and painted, while the trailing fluid 2 is made of corrosion-resistant stainless steel sheet or aluminum. Alternatively, the leading fluid 1 can be modified from an old part (casting) or processed from bar stock, while the trailing fluid 2 can be processed from steel plates of varying thicknesses. The leading fluid 1 and the trailing fluid 2 are made of different materials and processed using different processes, which shortens the construction period and reduces costs. They can be used to replace the existing overall stainless steel casting solution for the guide ring, saving casting mold and material costs. They also ensure the corrosion resistance of the trailing fluid 2 and prevent scratches on the impeller 3 caused by rust on the trailing fluid 2.

[0045] On the other hand, please refer to Figures 1-4 , is an embodiment of a centrifugal compressor provided by the utility model, comprising a volute 4, an impeller 3 and the above-mentioned guide ring; the impeller 3 is installed in the volute 4, the guide ring extends into the volute 4 and the rear guide body 2 is located between the volute 4 and the blades of the impeller 3, covering the outer side of the blades of the impeller 3, forming a gas flow channel between adjacent blades; the leading fluid 1 is fixedly connected to the front end of the volute 4, and the guide cavity 101 of the leading fluid 1 guides the airflow into the gas flow channel between the impeller 3 and the rear guide body 2.

[0046] For details, please refer to Figure 4 The circumferential surface at the rear end of the rearward guide body 2 butts against the inner wall of the volute 4, forming a preliminary seal. The outer wall of the forward guide body 1 is also provided with a volute connection platform 102 and a sealing groove 103. The volute connection platform 102 is located in front of the mounting groove 104, and the sealing groove 103 is located between the volute connection platform 102 and the mounting groove 104. The volute connection platform 102 can be configured as a ring-shaped platform or as multiple protrusions distributed around the circumference of the forward guide body 1, as needed.

[0047] Please refer to Figure 2The front end of the volute 4 is bolted to the volute connection platform 102. To prevent air leakage at the connection between the rearward guide body 2 and the forward guide body 1, a sealing ring 6 is provided between the volute 4 and the forward guide body 1; the sealing ring 6 is located within a sealing groove 103. The sealing groove 103 is located near the front end of the rearward guide body 2. The circumferential surface of the volute 4, which mates with the sealing ring 6, is close to the front end of the volute 4, making the fit tolerance easy to maintain and providing a good sealing effect, effectively preventing air leakage at the air intake of the impeller 3. During assembly, the sealing ring 6 is located at the front end of the forward guide body 1 to prevent the sealing ring 6 from being squeezed during installation into the volute 4, potentially causing sealing failure and extending the service life of the sealing ring 6. The sealing ring 6 can be an O-ring, or one with a rectangular or other cross-sectional shape. Furthermore, an adjustment gasket 5 is provided between the front end of the volute 4 and the volute connection platform 102. By replacing the adjustment gasket 5 with different thicknesses, the size of the second axial gap W2 between the rearward guide body 2 and the impeller 3 can be adjusted. When the profile of the impeller 3 changes, only the profile of the trailing guide body 2 is adjusted to change the third radial gap W3 between the trailing guide body 2 and the impeller 3 to meet different speed conditions of the centrifugal compressor.

[0048] During assembly, the leading fluid guide 1 and the trailing fluid guide 2 are first assembled to form a guide ring; the guide ring is then installed as a whole into the volute 4; the compressor with the above structure does not change the existing assembly method of the guide ring as an integrated structure, and the original integrated structure assembly tooling can be used; it is also conducive to standardized mass production.

[0049] The front end face of the back guide body 2 is spaced apart from the front end faces of the impeller 3 blades, not directly facing each other, to avoid overflow gaps in the impeller 3 compression section, which could lead to compressed gas leakage, pressure drop, and other problems. Preferably, the front end face of the back guide body 2 is located forward of the front end faces of the impeller 3 blades, with a fourth gap W4 between them. This fourth gap W4 is greater than 2 mm, which reduces some flow losses. Similarly, the circumferential surface at the rear end of the back guide body 2 is also spaced apart from the outer circumferential surface of the impeller 3 blades, with a first gap W1 between them. This first gap W1 is greater than 1 mm, reducing flow losses caused by vortexes at the outlet of the impeller 3.

[0050] Gas leaking from the gap between the rear end circumference of the rear guide body 2 and the volute 4 re-enters the impeller 3 through the gap at the interface between the leading and trailing guide bodies 1 and 2 for compression. If the gap between the trailing guide body 2 and the impeller 3 becomes too large due to airflow erosion, simply replacing the trailing guide body 2 will suffice.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A split guide ring, characterized in that: It comprises a leading fluid (1) and a trailing fluid (2), wherein the leading fluid (1) is located at the front side of the trailing fluid (2); A guide cavity (101) is formed in the leading fluid (1), an impeller cavity (201) is provided in the trailing fluid (2), and the impeller cavity (201) and the guide cavity (101) are in communication; The leading fluid (1) and the trailing fluid (2) are made of different materials.

2. A split guide ring according to claim 1, characterized in that: The outer side wall of the rear end portion of the leading fluid guide (1) is provided with a mounting groove (104), and the rear side groove wall of the mounting groove (104) is provided with a plurality of through-holes; the front end surface of the rear fluid guide (2) is provided with a plurality of connecting holes, and the leading fluid guide (1) and the rear fluid guide (2) are connected by connecting pieces placed from the mounting groove (104) into the through-holes and the connecting holes; And / or, the mounting groove (104) is annular and extends along the entire circumference of the leading fluid (1).

3. The split guide ring according to claim 1, characterized in that: The front end surface of the rear guide fluid (2) is provided with an outwardly protruding positioning platform (202), and the rear end surface of the front guide fluid (1) is partially concave to form a positioning portion (105). The positioning portion (105) cooperates with the positioning platform (202) to position the assembly of the rear guide fluid (2) and the front guide fluid (1).

4. A split guide ring according to claim 3, characterized in that: The positioning platform (202) is an annular boss and is close to the impeller cavity (201); the positioning portion (105) is a circular hole and is in communication with the guide cavity (101); the outer circumferential surface of the positioning platform (202) and the hole wall of the positioning portion (105) are matched for positioning.

5. A centrifugal compressor comprising a volute (4) and an impeller (3); characterized in that: It also includes a guide ring as described in any one of claims 1 to 4; the guide ring extends into the volute (4) and the leading fluid (1) is sealedly connected to the volute (4), and the trailing fluid (2) is located between the impeller (3) and the volute (4).

6. A centrifugal compressor according to claim 5, characterized in that: A volute connecting platform (102) is provided on the outer side wall of the leading fluid (1), and the front end of the volute (4) is connected to the volute connecting platform (102).

7. A centrifugal compressor according to claim 6, characterized in that: The volute connecting platform (102) is an annular platform; And / or, an adjustment gasket (5) is provided between the front end surface of the volute (4) and the volute connecting platform (102).

8. A centrifugal compressor according to claim 6, characterized in that: A sealing ring (6) is provided between the volute (4) and the leading fluid (1).

9. A centrifugal compressor according to claim 8, characterized in that: A sealing groove (103) is provided on the outer side wall of the leading fluid (1); the volute connecting platform (102) is located in front of the mounting groove (104), and the sealing groove (103) is located between the volute connecting platform (102) and the mounting groove (104); and the sealing ring (6) is located in the sealing groove (103).

10. The centrifugal compressor according to claim 5, characterized in that: There is a first gap (W1) between the circumferential surface of the rear end of the trailing guide body (2) and the circumferential surface of the blade of the impeller (3), and the first gap (W1) is greater than 1 mm; And / or, there is a fourth gap (W4) between the front end surface of the trailing guide body (2) and the front end surface of the impeller (3) blade, and the fourth gap (W4) is greater than 2 mm.

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