Sealing sleeve, sealing structure and compressor

Abstract

The utility model discloses a sealing sleeve, a sealing structure and a compressor, and relates to the technical field of impeller equipment sealing, the sealing sleeve is arranged at the shaft end joint of a driving shaft and an execution piece connecting shaft and comprises an annular shell, and the inner wall of the shell is provided with a threaded section and a sealing ring; the threaded section is fixedly connected with the threads on the driving shaft in a matched mode. The sealing ring is located on the executing piece connecting shaft. The sealing structure is arranged on the driving shaft extending out of the box body, the extending-out end of the driving shaft is used for transmitting torque to the executing piece connecting shaft, and the sealing structure comprises a shaft end seal and the sealing sleeve. The sealing structure is arranged at the joint of the output shaft of the compressor and the connecting shaft of the impeller. The compressor solves the technical problem that the efficiency of the compressor is reduced due to high pressure loss of the gas end of the compressor in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of impeller equipment sealing technology, and in particular to a sealing sleeve, sealing structure and compressor. Background Technology

[0002] The compressor includes a gas end and a gearbox. The gas end includes an impeller and a volute. The gearbox includes an input shaft and at least one set of output shafts. The output shafts are connected to the connecting shaft of the impeller to transmit torque to the impeller disk. In the process of developing this utility model, the inventors discovered that the prior art has at least the following problem: when the pressure of the working fluid in the compressor increases, the pressure loss at the gas end increases significantly, leading to a decrease in the efficiency of the compressor. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing sleeve and sealing structure to alleviate the above-mentioned problems.

[0004] The inventors discovered that the significant increase in pressure loss and decrease in efficiency of the compressor is caused by backflow inside the compressor. Furthermore, as the pressure of the working fluid in the compressor increases, the impact of backflow on the compressor's pressure becomes increasingly pronounced. Backflow refers to the phenomenon where gas flows in the opposite direction to its original flow direction. Backflow creates resistance during gas flow, increases energy loss, and reduces the compressor's compression efficiency. These problems are particularly noticeable in the high-pressure region of the compressor.

[0005] To achieve this objective, a sealing sleeve is provided, which is disposed at the shaft end connection between the drive shaft and the actuator connecting shaft. The sleeve includes an annular outer shell, the inner wall of which is provided with a threaded section and a sealing ring. The threaded section is fixedly connected to the thread on the drive shaft. The sealing ring is located on the actuator connecting shaft.

[0006] Furthermore, it also includes a thread relief groove, which is located at the end of the thread segment.

[0007] Furthermore, a positioning ring is provided on one end face near the threaded section, the positioning ring being used to seal against the shaft end.

[0008] On the other hand, a sealing structure is also provided, disposed on a drive shaft extending from the housing, the extended end of the drive shaft being used to transmit torque to the actuator connecting shaft, including a shaft end seal and the aforementioned sealing sleeve; the shaft end seal is located on the housing; the sealing sleeve is disposed at the connection between the extended end of the drive shaft and the actuator connecting shaft, the threaded section is connected to the drive shaft, and the sealing ring is located on the actuator connecting shaft; the end face of the sealing sleeve abuts against the end face of the shaft end seal.

[0009] Furthermore, the shaft end seal is a dry gas seal.

[0010] On another front, a compressor is also provided, comprising a gas end and a gearbox. The gas end includes an impeller and a volute, and the gearbox includes at least one output shaft. The impeller includes an impeller disk and a connecting shaft. A sealing structure is provided at the connection between the output shaft and the connecting shaft. The sealing structure is located on a drive shaft extending from the housing. The extended end of the drive shaft is used to transmit torque to the actuator connecting shaft, and includes a shaft end seal and a sealing sleeve of any of the above types. The shaft end seal is located on the housing. The sealing sleeve is located at the connection between the extended end of the drive shaft and the actuator connecting shaft. The threaded section is connected to the drive shaft, and the sealing ring is located on the actuator connecting shaft. The end face of the sealing sleeve abuts against the end face of the shaft end seal.

[0011] Furthermore, the output shaft and the connecting shaft are connected by end face teeth, and the output shaft and the connecting shaft are fixed by a shaft head nut or a tie rod.

[0012] Furthermore, the sealing sleeve also includes an end face tooth clearance groove, which is located on the inner wall of the housing and between the threaded section and the sealing ring, with the groove opening facing the end face tooth connection.

[0013] Furthermore, a positioning pin and a positioning hole are provided between the output shaft and the connecting shaft.

[0014] Furthermore, the output shaft is a high-speed shaft, and the impeller is located in the high-pressure zone.

[0015] One of the above technical solutions has the following advantages or beneficial effects:

[0016] The sealing sleeve in this design is located at the connection point between the drive shaft and the actuator connecting shaft. It includes an annular outer shell, with a threaded section and a sealing ring on the inner wall of the shell. The threaded section is fixedly connected to the thread on the drive shaft, and the sealing ring is located on the actuator connecting shaft. By fixing the sealing sleeve to the drive shaft via the threaded section and to the actuator connecting shaft via the sealing ring, the working fluid at the actuator cannot enter the connection point between the drive shaft and the actuator connecting shaft, thus ensuring a seal at the connection point.

[0017] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0018] The sealing structure of this design is located on the drive shaft extending from the housing. The extended end of the drive shaft transmits torque to the actuator connecting shaft. The sealing structure includes a shaft end seal and the aforementioned sealing sleeve. The shaft end seal is located on the housing and serves to seal between the housing and the drive shaft. The sealing sleeve is positioned at the connection between the extended end of the drive shaft and the actuator connecting shaft. The threaded section of the sealing sleeve connects to the drive shaft, and the sealing ring of the sealing sleeve is located on the actuator connecting shaft. The end face of the sealing sleeve abuts against the end face of the shaft end seal. In this sealing structure, the sealing sleeve not only seals the connection between the extended end of the drive shaft and the actuator connecting shaft but also bears a portion of the axial force of the shaft end seal, ensuring a tight fit between the shaft end seal and the drive shaft. This sealing structure not only blocks the flow path of the countercurrent working fluid but also prevents the working fluid from flowing into the housing.

[0019] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0020] The compressor of this design includes a gas end and a gearbox. The gas end includes an impeller and a volute, the gearbox includes at least one output shaft, and the impeller includes an impeller disc and a connecting shaft. After the output shaft and the connecting shaft of the impeller are connected, they are fixed at the center of the impeller using a threaded connection. The original flow direction of the gas end of the compressor is from the inlet to the outlet. The inlet and outlet of the compressor are located axially and radially on the impeller, respectively. At this time, the high-pressure working gas radially on the back of the impeller moves axially through the thread at the tie rod, which is opposite to the original flow direction, resulting in countercurrent flow inside the compressor. The compressor of this design includes the aforementioned sealing structure located at the connection between the output shaft and the connecting shaft. There is a shaft end seal between the output shaft and the gearbox housing. A sealing sleeve is provided at the connection between the extended end of the output shaft and the connecting shaft. The threaded section of the sealing sleeve is fixedly connected to the thread on the output shaft. The sealing ring of the sealing sleeve is located on the connecting shaft of the actuator, and the end face of the sealing sleeve abuts against the end face of the shaft end seal. The sealing sleeve in this design prevents the radial flow of high-pressure working gas from the back of the impeller towards the tie rod, thus preventing backflow inside the compressor. Furthermore, because the end face of the sealing sleeve abuts against the end face of the shaft end seal, the radial flow of high-pressure working gas from the back of the impeller also prevents it from flowing into the gearbox housing. Therefore, this compressor design, through the sealing sleeve, prevents backflow within the compressor, avoids pressure loss, and ensures efficient compressor operation. Attached Figure Description

[0021] Figure 1 It is the sealing structure of Example 1;

[0022] Figure 2 It is the compressor of Example 2.

[0023] In the diagram: 10-Sealing sleeve; 11-Outer shell; 12-Threaded section; 13-Sealing ring; 14-Threaded relief groove; 15-Positioning ring; 16-End face tooth clearance groove; 20-Shaft end seal / dry gas seal; 30-Box body; 31-Output shaft / Drive shaft; 32-Dry gas seal mounting base; 41-Impeller disk; 42-Impeller connecting shaft / Actuator connecting shaft; 43-Vortex casing; 44-Inlet passage; 50-Shaft end connection / End face tooth connection; 51-Tie rod; 52-Positioning pin. Detailed Implementation

[0024] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Example 1:

[0028] like Figure 1As shown, this embodiment provides a sealing sleeve 10, disposed at the shaft end connection 50 of the drive shaft 31 and the actuator connecting shaft 42. It includes an annular outer shell 11, with a threaded section 12 and a sealing ring 13 on the inner wall of the outer shell 11. The threaded section 12 is fixedly connected to the thread on the drive shaft 31, and the sealing ring 13 is located on the actuator connecting shaft 42. The sealing sleeve 10 is fixed to the drive shaft 31 by the threaded section 12 and to the actuator connecting shaft 42 by the sealing ring 13, preventing the working fluid at the actuator from entering the shaft end connection 50 of the drive shaft 31 and the actuator connecting shaft 42, thus ensuring the seal of the shaft end connection 50.

[0029] like Figure 2 Taking its application in a compressor as an example, the function of the sealing sleeve 10 in this embodiment will be explained. The compressor includes a gas end and a gearbox. The gas end includes an impeller and a volute 43. The gearbox includes an output shaft 31, which is connected to the connecting shaft of the impeller to transmit torque to the impeller disk 41. From the gas end, the output shaft 31 of the gearbox is the drive shaft, the impeller disk 41 is the actuator, and the connecting shaft 42 of the impeller is the actuator connecting shaft 42. To address the issue of increased pressure loss at the gas end of the compressor, a sealing sleeve 10 is installed at the shaft end connection 50 between the drive shaft 31 and the actuator connecting shaft 42. The sealing sleeve 10 is fixed to the drive shaft 31 via its threaded section 12, and further fixed to the actuator connecting shaft 42 via its sealing ring 13. This ensures the sealing of the shaft end connection between the drive shaft 31 and the actuator connecting shaft 42, preventing the working fluid at the actuator from entering the shaft end connection 50 between the drive shaft 31 and the actuator connecting shaft 42. This blocks the flow path of the backflowing working fluid, thereby avoiding backflow, reducing pressure loss at the gas end of the compressor, and preventing a decrease in compressor efficiency.

[0030] Furthermore, it also includes a thread relief groove 14, which is located at the end of the thread section 12.

[0031] Furthermore, a positioning ring 15 is provided on one end face near the threaded section 12, which is used to abut against the shaft end seal 20.

[0032] This embodiment also provides a sealing structure disposed on a drive shaft 31 extending from the housing 30. The extended end of the drive shaft 31 is used to transmit torque to the actuator connecting shaft 42. The sealing structure includes a shaft end seal 20 and the aforementioned sealing sleeve 10. The shaft end seal 20 is located on the housing 30 and is used for sealing between the housing 30 and the drive shaft 31. The sealing sleeve 10 is disposed at the connection between the extended end of the drive shaft 31 and the actuator connecting shaft 42. The threaded section 12 of the sealing sleeve 10 is connected to the drive shaft 31, and the sealing ring 13 of the sealing sleeve 10 is located on the actuator connecting shaft 42. The end face of the sealing sleeve 10 abuts against the end face of the shaft end seal 20. In the above sealing structure, the sealing sleeve 10 not only seals the connection between the extended end of the drive shaft 31 and the actuator connecting shaft 42, but also bears part of the axial force of the shaft end seal 20, ensuring a tight fit between the shaft end seal 20 and the drive shaft 31. The sealing structure of this solution not only blocks the flow path of the countercurrent working fluid, but also prevents the working fluid from flowing into the housing 30.

[0033] Furthermore, the shaft end seal 20 is a dry gas seal 20. The dry gas seal 20, also known as a dry-running gas seal, is a new type of shaft end seal 20 that applies slotted sealing technology to gas sealing. It is a non-contact seal and is particularly suitable as a shaft end seal 20 for high-speed, high-pressure equipment.

[0034] Example 2:

[0035] The inventors discovered that the significant increase in pressure loss and decrease in efficiency of the compressor is caused by backflow inside the compressor. Furthermore, as the pressure of the working fluid in the compressor increases, the impact of backflow on the compressor's pressure becomes increasingly pronounced. Backflow refers to the phenomenon where gas flows in the opposite direction to its original flow direction. Backflow creates resistance during gas flow, increases energy loss, and reduces the compressor's compression efficiency. These problems are particularly noticeable in the high-pressure region of the compressor.

[0036] like Figure 2 This embodiment provides a compressor, including a gas end and a gearbox. The gas end includes an impeller and a volute 43. The gearbox includes at least one output shaft 31. The impeller includes an impeller disk 41 and a connecting shaft 42. After the output shaft 31 is connected to the connecting shaft 42 of the impeller, it is connected and fixed at the center of the impeller by a thread or a tie rod 51. During normal operation, the compressor's inlet direction is consistent with the output shaft 31 and the connecting shaft, and the outlet direction is tangential to the impeller. The original flow direction of the gas end of the compressor is from the inlet to the outlet, and the inlet pressure is less than the outlet pressure.

[0037] The inventors discovered that in the prior art, high-pressure working gas leaking from the back of the impeller disk 41 enters the connection between the output shaft 31 and the connecting shaft 42 of the impeller, and flows out from the thread or tie rod 51 at the center of the impeller. Since the center of the impeller is located in the low-pressure zone of the volute 43, and the back of the impeller disk 41 is located in the high-pressure zone of the volute 43, the leaked high-pressure working gas flows in the opposite direction to the original flow direction of the compressor, i.e., it is counter-current gas. This counter-current gas causes resistance during gas flow, increases energy loss, and reduces the compressor's compression efficiency. This problem is particularly pronounced in the high-pressure zone of the compressor.

[0038] The compressor provided in this embodiment also includes the aforementioned sealing structure. A shaft end seal 20 is disposed between the output shaft 31 and the gearbox housing 30, and a sealing sleeve 10 is disposed at the connection between the protruding end of the output shaft 31 and the connecting shaft. The sealing ring 13 of the sealing sleeve 10 is located on the connecting shaft 42 of the impeller, and the threaded section 12 of the sealing sleeve 10 is threadedly connected to the output shaft 31. The end face of the sealing sleeve 10 abuts against the end face of the shaft end seal 20.

[0039] Furthermore, the shaft end seal 20 uses a dry gas seal, and a dry gas seal mounting base 32 is provided on the housing 30.

[0040] Furthermore, the dry gas seal 20 includes a sleeve fixed to the output shaft 31 and a structure fixed to the housing, and the end face of the sealing sleeve 10 abuts against the sleeve fixed to the output shaft 31 on the dry gas seal.

[0041] Furthermore, on the end face of the sealing sleeve 10, the positioning ring 15 of the sealing sleeve 10 abuts against the end face of the shaft end seal 20. Furthermore, the positioning ring 15 of the sealing sleeve 10 has a sealing gasket, which is located on the abutting end face of the positioning ring 15 of the sealing sleeve 10 and the shaft end seal 20.

[0042] The compressor provided in this embodiment prevents the working fluid from entering the gearbox housing 30 from the output shaft 31 by setting a shaft end seal 20. The sealing sleeve 10 abuts against the shaft end seal 20, preventing the high-pressure working fluid on the back of the impeller disk 41 from entering the connection between the output shaft 31 and the connecting shaft 42 of the impeller, thereby preventing the high-pressure working fluid from flowing out from the thread or tie rod 51 in the center of the impeller, and thus avoiding backflow problems. Because the compressor of this embodiment can avoid backflow problems, the energy loss inside the compressor is reduced, and it can operate with higher compression efficiency. Since backflow problems in the high-pressure area have a significant impact on compressor efficiency, compared with existing high-pressure compressors, the compressor of this embodiment prevents backflow problems inside the compressor by using the sealing sleeve 10, avoiding pressure loss and ensuring the efficient operation of the compressor.

[0043] Furthermore, the output shaft 31 of the gearbox is connected to the connecting shaft of the impeller via an end face tooth connection 50, a triangular shaft, a single key, or a double key. The output shaft 31 and the connecting shaft are fixed by a shaft head nut or a tie rod 51, which is used to transmit the torque of the output shaft 31 of the gearbox to the connecting shaft of the impeller.

[0044] Furthermore, the sealing sleeve 10 also includes an end face tooth clearance groove 16, which is located on the inner wall of the outer casing 11 and between the threaded section 12 and the sealing ring 13. The groove opening of the end face tooth clearance groove 16 faces the end face tooth connection 50. The end face tooth clearance groove 16 is used to avoid the end face tooth connection 50 between the output shaft 31 of the gearbox and the connecting shaft of the impeller, so as to prevent the outer casing 11 of the sealing sleeve 10 from interfering with the end face tooth transmission during torque transmission.

[0045] Furthermore, a locating pin 52 and a locating hole are provided between the output shaft 31 of the gearbox and the connecting shaft of the impeller.

[0046] Furthermore, the compressor is divided into a high-speed zone and a low-speed zone, the output shaft 31 of the gearbox is the high-speed shaft, and the impeller is located in the high-pressure zone.

[0047] Furthermore, the compressor also includes an intake passage 44, and the compressor's intake structure includes a volute 43 and an intake passage 44.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sealing sleeve, characterized in that, Located at the shaft end connection between the drive shaft and the actuator connecting shaft, the device includes an annular outer shell, the inner wall of which is provided with a threaded section and a sealing ring; the threaded section is fixedly connected to the thread on the drive shaft; the sealing ring is located on the actuator connecting shaft.

2. The sealing sleeve according to claim 1, characterized in that, It also includes a thread relief groove, which is located at the end of the thread segment.

3. The sealing sleeve according to claim 1, characterized in that, A locating ring is provided on one end face near the threaded section, and the locating ring is used to seal against the shaft end.

4. A sealing structure, characterized in that, Provided on a drive shaft extending from the housing, the extended end of the drive shaft is used to transmit torque to the actuator connecting shaft, including a shaft end seal and a sealing sleeve as described in any one of claims 1-3; The shaft end seal is located on the housing; The sealing sleeve is disposed at the connection between the extended end of the drive shaft and the connecting shaft of the actuator; the threaded section is connected to the drive shaft; and the sealing ring is located on the connecting shaft of the actuator. The end face of the sealing sleeve abuts against the end face of the shaft end seal.

5. The sealing structure according to claim 4, characterized in that, The shaft end seal is a dry gas seal.

6. A compressor, characterized in that, The device includes a gas end and a gearbox. The gas end includes an impeller and a volute. The gearbox includes at least one output shaft. The impeller includes an impeller disk and a connecting shaft. The connection between the output shaft and the connecting shaft is provided with a sealing structure as described in any one of claims 4-5.

7. The compressor according to claim 6, characterized in that, The output shaft and the connecting shaft are connected by end face teeth, and the output shaft and the connecting shaft are fixed by a shaft head nut or a tie rod.

8. The compressor according to claim 7, characterized in that, The sealing sleeve also includes an end face tooth clearance groove, which is located on the inner wall of the housing and between the threaded section and the sealing ring, with the groove opening facing the end face tooth connection.

9. The compressor according to claim 7, characterized in that, A positioning pin and a positioning hole are provided between the output shaft and the connecting shaft.

10. The compressor according to claim 6, characterized in that, The output shaft is a high-speed shaft, and the impeller is located in the high-pressure zone.

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