Disassembly-free and easy-to-maintain rotating shaft sealing structure and centrifugal compressor using same

Abstract

The utility model discloses a rotating shaft sealing structure free of disassembly and easy to maintain and a centrifugal compressor using the same, which comprise a copper bush arranged between a mounting seat and a shell and sleeved on a rotating shaft, and an annular oil storage cavity formed between an inner wall cavity of the copper bush and an outer wall of a driving shaft, an oil injection hole and an exhaust hole are formed in the outer wall of the copper bush, radial sealing rings are assembled in the two radial sealing grooves, and end face sealing rings are assembled in the end face sealing grooves. Through implementation of the scheme, the problems that the seal is abraded and leaks after the rotary dynamic seal at the driving shaft operates for a long time, and refrigerant recycling and disassembling are needed for seal maintenance and replacement are solved, so that the rotary shaft sealing structure can achieve the purposes of being free of disassembling and easy to maintain, the sealing effect is good, and the cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures of centrifugal compressors, in particular to a disassembly-free and easy-to-maintain rotary shaft sealing structure and a centrifugal compressor using the same. Background Art

[0002] When using existing centrifugal compressors, the air intake volume needs to be controlled. This is typically achieved by using a guide vane adjustment mechanism (airflow adjustment mechanism) to control the refrigerant intake volume and, in turn, the cooling capacity. In commonly used guide vane adjustment mechanisms, a common method involves a motor actuator driving the guide vane drive shaft. This drive shaft, through a transmission block and connecting rod, drives a drive ring, which ultimately drives the driven guide vane drive shaft to rotate the guide vanes. Therefore, a motor actuator is typically installed outside the centrifugal compressor casing. This motor actuator is connected to the guide vane drive shaft, which extends into the casing, for drive. The guide vane drive shaft is a rotating shaft, and during its design and assembly, a rotating shaft sealing structure is required to seal the guide vane drive shaft.

[0003] In the process of implementing the present invention, the applicant discovered that the existing rotary shaft sealing structure for the guide vane adjustment mechanism has at least the following problems:

[0004] 1. Existing rotating shaft sealing structures are mostly mechanical seals and magnetic seals. Traditional mechanical seals have complex structures, difficult maintenance, and there is a risk of leakage over time; magnetic connection seals have complex structures and high costs, and are mostly used in scientific research projects with low cost requirements.

[0005] 2. Existing O-ring sealing structures are mostly single-layer seals, which are prone to dry friction and rubber aging after long-term operation, causing problems such as compressor refrigerant leakage.

[0006] In view of this, how to solve the problems of the existing rotary shaft sealing structure for the guide vane adjustment mechanism, such as maintenance trouble, high cost, and leakage of aging refrigerant, has become a subject that needs to be studied by the present invention. Utility Model Content

[0007] The utility model aims to provide a disassembly-free and easy-to-maintain rotary shaft sealing structure and a centrifugal compressor using the same.

[0008] To achieve the above objectives, in a first aspect, the present invention adopts a technical solution: a disassembly-free and maintenance-free rotary shaft sealing structure is proposed for sealing an airflow regulating mechanism in a centrifugal compressor, wherein the airflow regulating mechanism comprises a driver and a mounting seat mounted on a centrifugal compressor housing, wherein the driver is connected to a drive shaft extending into the interior of the housing, wherein the drive shaft is a rotary shaft; the innovation lies in:

[0009] The sealing structure comprises a copper bushing which is arranged between the mounting seat and the shell and sleeved on the rotating shaft.

[0010] The inner wall of the copper bushing is provided with a cavity. After the copper bushing is assembled on the drive shaft, an annular oil storage cavity is formed between the inner wall cavity of the copper bushing and the outer wall of the drive shaft.

[0011] An oil filling hole and an exhaust hole are provided on the outer wall of the copper bushing. Both the oil filling hole and the exhaust hole are connected to the oil storage chamber. The oil filling hole and the exhaust hole are exposed outside the mounting seat. An oil filling nozzle is provided at the oil filling hole, and a detachable plug is provided at the exhaust hole.

[0012] The inner wall of the copper bushing is provided with radial sealing grooves on both the front and rear sides of the oil storage cavity, and the portion where the copper bushing abuts the shell is provided with an end face sealing groove. Radial sealing rings are installed in both radial sealing grooves, and an end face sealing ring is installed in the end face sealing groove.

[0013] To achieve the above-mentioned purpose, in a second aspect, the present invention adopts a technical solution of: proposing a centrifugal compressor, which uses the disassembly-free and easy-to-maintain rotary shaft sealing structure described in the first aspect of the present invention.

[0014] The relevant contents of this utility model are explained as follows:

[0015] 1. In the present invention, by conducting corresponding research on the sealing structure of the driving shaft of the air flow regulating mechanism in the centrifugal compressor, the existing rotary shaft sealing structure for the guide vane regulating mechanism has the problems of troublesome maintenance, high cost, and leakage of aging refrigerant. The present invention has innovatively designed a rotary shaft sealing structure that does not require disassembly and is easy to maintain, and a centrifugal compressor using the rotary shaft sealing structure that does not require disassembly and is easy to maintain. In combination with the characteristic that the driving shaft of the air flow regulating mechanism of the centrifugal compressor will almost always rotate at a low speed once it is turned on, the sealing structure is designed to include a copper bushing arranged between the mounting seat and the housing and sleeved on the rotating shaft, thereby replacing the conventional bearing structure. A cavity formed between the inner wall of the copper bushing and the outer wall of the driving shaft forms a seal. An annular oil storage chamber is formed, and solid grease is added during assembly. Lubricating oil can be injected into the oil storage chamber during subsequent use and maintenance to play a role in sealing, lubrication and dust prevention, so as to reduce the wear of the radial sealing ring on the copper bushing and increase its service life. An oil filling hole and an exhaust hole are opened on the outer wall of the copper bushing, which are connected to the oil storage chamber and exposed to the outside of the mounting seat. The oil filling hole is equipped with an oil filling nozzle, and the exhaust hole is equipped with a detachable plug. Exhaust and oil filling can be completed without removing the copper bushing, which is easy to maintain. Two radial sealing rings are set on the inner wall of the copper bushing. The drive shaft is a rotating shaft, and the double-layer seal has a better sealing effect. An end face sealing ring is set at the part where the copper bushing abuts the shell to avoid refrigerant leakage. Through the implementation of the above scheme, the utility model solves the problems of seal wear and leakage of the rotating dynamic seal at the drive shaft after long-term operation, and the need to dismantle the machine for refrigerant recovery and maintenance and replacement of the seal. The rotating shaft sealing structure can achieve the purpose of no disassembly and good maintenance, and has a good sealing effect and can reduce costs.

[0016] 2. In the solution of the first aspect above, the copper bushing has a first end and a second end that are perpendicular to each other, the first end and the second end forming a T-shaped structure, a mounting groove is provided in the shell, the first end of the copper bushing is assembled into the mounting groove, and the second end of the copper bushing is positioned and connected to the mounting seat. The copper bushing with such a structure is more suitable for the application of the airflow regulating mechanism in the centrifugal compressor, wherein the driving shaft of the airflow regulating mechanism is connected to the motor driver located outside the shell, and then the driving shaft is installed in the copper bushing and extends into the shell. The copper bushing with a T-shaped structure can better provide support and rotational lubrication for the low-speed rotation of the driving shaft. This structural arrangement can also better ensure that the refrigerant of the centrifugal compressor will not leak.

[0017] 3. In the first aspect, one of the two radial sealing grooves is provided on the inner wall of the first end portion, and the other is provided on the inner wall of the second end portion; the end face sealing groove is provided on the end face of the second end portion facing the first end portion. This sealing arrangement provides a more rational seal arrangement and a better sealing effect.

[0018] 4. In the solution of the first aspect, the oil filling and venting holes are provided on the second end portion, and the oil reservoir is located midway between the first and second ends. This optimizes the placement of the oil filling and venting holes, facilitating better air and oil filling during subsequent maintenance, and reducing maintenance effort.

[0019] 5. In the solution of the first aspect above, the mounting seat is in an X-shape, the copper bushing is fixed to the mounting seat by fasteners, and the mounting seat is fixed to the shell by fasteners, so that the copper bushing is better positioned between the mounting seat and the shell, ensuring the stability of the copper bushing and the stable operation of the drive shaft.

[0020] 6. In the solution of the first aspect, the front and rear sides of the second end of the copper bushing are enclosed by the mounting base and the housing, the upper and lower sides of the second end of the copper bushing are enclosed by the "X"-shaped mounting base, and the left and right sides of the second end of the copper bushing are exposed from the "X"-shaped mounting base. The oil filling hole and the vent hole are located on the left and right sides of the second end, respectively. This design not only secures the copper bushing in place, but also optimizes the placement of the oil filling and vent holes, allowing for better ventilation and oiling during subsequent maintenance, reducing maintenance effort.

[0021] 7. In the solution of the first aspect above, the copper bushing is a bushing structure made of tin bronze. The copper bushing made of this material and the DDC drive shaft move relative to each other. The self-lubricating effect of tin bronze, combined with the lubricating oil in the oil storage chamber, allows relative movement, eliminates the sliding bearing structure, and saves costs.

[0022] 8. In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to mechanical connection, direct connection, or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements, unless otherwise expressly specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] 9. In the present invention, the orientation or position relationship indicated by terms such as "center", "upper", "lower", "axial", "bottom", "inner", and "outer" is based on the orientation or position assembly relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0024] 10. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0025] Due to the application of the above scheme, the utility model has the following advantages and effects compared with the prior art:

[0026] 1. In the technical solution of the present invention, through corresponding research on the sealing structure of the drive shaft of the airflow regulating mechanism in the centrifugal compressor, the existing rotary shaft sealing structure for the guide vane regulating mechanism has the problems of troublesome maintenance, high cost, and leakage of aging refrigerant. The present invention has innovatively designed a rotary shaft sealing structure that does not require disassembly and is easy to maintain, and a centrifugal compressor using the rotary shaft sealing structure that does not require disassembly and is easy to maintain. In combination with the characteristic that the drive shaft of the airflow regulating mechanism of the centrifugal compressor almost always rotates at a low speed once the centrifugal compressor is turned on, the sealing structure is designed to include a copper bushing arranged between the mounting seat and the shell and sleeved on the rotating shaft, thereby replacing the conventional bearing structure and saving costs.

[0027] 2. In the technical solution of the present invention, an annular oil storage cavity is formed between the inner wall cavity of the copper bushing and the outer wall of the drive shaft. Solid grease is added during assembly, and lubricating oil can be injected into the oil storage cavity during subsequent use and maintenance to play a role of sealing, lubrication and dust prevention, so as to reduce the wear of the radial sealing ring on the copper bushing and improve its service life. An oil filling hole and an exhaust hole connected to the oil storage cavity and exposed to the outside of the mounting seat are opened on the outer wall of the copper bushing. The oil filling hole is equipped with an oil filling nozzle, and the exhaust hole is equipped with a detachable plug. Exhaust and oil filling can be completed without removing the copper bushing, which is easy to maintain. Two radial sealing rings are arranged on the inner wall of the copper bushing. The drive shaft is a rotating shaft, and the double-layer seal has a better sealing effect. An end face sealing ring is arranged at the position where the copper bushing abuts the shell to avoid refrigerant leakage.

[0028] 3. In summary, the present invention solves the problems of seal wear and leakage of the rotating dynamic seal at the drive shaft after long-term operation, and the need to recover and disassemble the refrigerant for seal maintenance and replacement through the implementation of the above scheme. The rotating shaft sealing structure can achieve the purpose of no need for disassembly and easy maintenance, and has good sealing effect and can reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front view of an embodiment of the utility model;

[0030] Figure 2 for Figure 1AA section schematic diagram;

[0031] Figure 3 for Figure 2 A local enlarged schematic diagram in FIG.

[0032] Figure 4 This is an exploded diagram of an embodiment of the present invention (viewpoint 1);

[0033] Figure 5 for Figure 4 A local enlarged schematic diagram in FIG.

[0034] Figure 6 This is an exploded diagram of an embodiment of the present invention (viewpoint 2);

[0035] Figure 7 A three-dimensional schematic diagram of a copper bushing in an embodiment of the present utility model (viewing angle 1);

[0036] Figure 8 A perspective diagram of a copper bushing in an embodiment of the present invention (viewing angle 2);

[0037] Figure 9 It is a cross-sectional schematic diagram of the copper bushing in the embodiment of the present utility model.

[0038] The various parts of the above drawings are shown as follows:

[0039] 1. Copper bushing;

[0040] 11. First end; 12. Second end;

[0041] 121, oil filling hole; 122, oil filling nozzle; 123, exhaust hole; 124, plug;

[0042] 125. End face sealing groove;

[0043] 13. Oil storage chamber; 14. Radial sealing groove;

[0044] 2. Radial sealing ring; 3. End face sealing ring;

[0045] 7. Drive ring;

[0046] 8. Housing; 81. Mounting slot;

[0047] 9. Airflow adjustment mechanism; 91. Driver; 92. Drive shaft; 93. Mounting seat. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0049] The present invention aims to solve the problems of the existing rotary shaft sealing structure for the guide vane adjustment mechanism, such as troublesome maintenance, high cost, and leakage of aging refrigerant. In view of the fact that the drive shaft 92 of the airflow adjustment mechanism 9 of the centrifugal compressor almost always rotates at a low speed once the centrifugal compressor is turned on, the present invention innovatively designs a rotary shaft sealing structure that is easy to maintain and does not require disassembly, and a centrifugal compressor using the rotary shaft sealing structure that is easy to maintain and does not require disassembly.

[0050] Example 1, as Figures 1 to 9 As shown, the embodiment of the present utility model discloses a rotary shaft sealing structure that is easy to maintain and does not require disassembly, and is used for sealing an airflow regulating mechanism 9 in a centrifugal compressor. The airflow regulating mechanism 9 comprises a driver 91 and a mounting seat 93 mounted on a centrifugal compressor housing 8. The driver 91 is connected to a drive shaft 92 extending into the interior of the housing 8. The drive shaft 92 is a rotary shaft. The sealing structure comprises a copper bushing 1 (see FIG. 1 ) disposed between the mounting seat 93 and the housing 8 and sleeved on the rotary shaft. Figure 1 、 Figure 2 ).

[0051] The inner wall of the copper bushing 1 has a cavity. After the copper bushing 1 is assembled on the drive shaft 92, an annular oil storage cavity 13 is formed between the inner wall cavity of the copper bushing 1 and the outer wall of the drive shaft 92 (see Figure 3 ).

[0052] The outer wall of the copper bushing 1 is provided with an oil filling hole 121 and an exhaust hole 123. The oil filling hole 121 and the exhaust hole 123 are both connected to the oil storage chamber 13. The oil filling hole 121 and the exhaust hole 123 are exposed outside the mounting seat 93. The oil filling hole 121 is equipped with an oil filling nozzle 122, and the exhaust hole 123 is equipped with a detachable plug 124 (see Figure 7 、 Figure 8 、 Figure 9 ).

[0053] The inner wall of the copper bushing 1 is provided with radial sealing grooves 14 on both the front and rear sides of the oil storage cavity 13, and an end face sealing groove 125 is provided at the position where the copper bushing 1 abuts against the housing 8. A radial sealing ring 2 is installed in each of the two radial sealing grooves 14, and an end face sealing ring 3 is installed in the end face sealing groove 125 (see FIG. Figure 9 ).

[0054] Through the implementation of the first embodiment of the present invention, the sealing structure is designed to include a copper bushing 1 provided between the mounting seat 93 and the housing 8 and sleeved on the rotating shaft, thereby replacing the conventional bearing structure. An annular oil storage chamber 13 is formed between the inner wall cavity of the copper bushing 1 and the outer wall of the drive shaft 92. Solid grease is added during assembly. Lubricating oil can be injected into the oil storage chamber 13 during subsequent use and maintenance to play a sealing, lubricating and dust-proof role, thereby reducing the wear of the radial sealing ring 2 on the copper bushing 1 and improving its service life. An oil filling hole 121 and an exhaust hole 123 are opened which are connected to the oil storage chamber 13 and exposed outside the mounting seat 93. The oil filling hole 121 is equipped with an oil filling nozzle 122, and the exhaust hole 123 is equipped with a detachable plug 124. Exhaust and oil filling can be completed without removing the copper bushing 1, which is easy to maintain. Two radial sealing rings 2 are arranged on the inner wall of the copper bushing 1. The drive shaft 92 is a rotating shaft, and the double-layer seal has a better sealing effect. An end face sealing ring 3 is arranged at the position where the copper bushing 1 abuts the shell 8 to avoid refrigerant leakage.

[0055] In the first embodiment of the present invention, the copper bushing 1 has a first end 11 and a second end 12 perpendicular to each other, and the first end 11 and the second end 12 form a T-shaped structure (see Figure 3 、 Figure 9 ), a mounting groove 81 is provided in the shell 8, the first end 11 of the copper bushing 1 is assembled into the mounting groove 81, and the second end 12 of the copper bushing 1 is positioned and connected to the mounting seat 93. The copper bushing 1 with this structure is more suitable for the application of the airflow adjustment mechanism 9 in the centrifugal compressor, wherein the drive shaft 92 of the airflow adjustment mechanism 9 is connected to the motor driver 91 located outside the shell 8, and then the drive shaft 92 is installed in the copper bushing 1 and extends into the shell 8. The copper bushing 1 with a T-shaped structure can better provide support and rotational lubrication for the low-speed rotation of the drive shaft 92. This structural arrangement can also better ensure that the refrigerant of the centrifugal compressor will not leak.

[0056] In the first embodiment of the present invention, one of the two radial sealing grooves 14 is provided on the inner wall of the first end portion 11, and the other is provided on the inner wall of the second end portion 12; the end face sealing groove 125 is provided on the end face of the second end portion 12 facing the first end portion 11 (see FIG. Figure 9 ). This sealing arrangement makes the sealing position arrangement more reasonable and the sealing effect better.

[0057] In the first embodiment of the present invention, the oil filling hole 121 and the exhaust hole 123 are arranged on the second end portion 12, and the oil storage chamber 13 is located in the middle of the first end portion 11 and the second end portion 12. This makes the position arrangement of the oil filling hole 121 and the exhaust hole 123 more reasonable, and can better perform exhaust and oil filling in subsequent maintenance, reducing the difficulty of maintenance (see Figure 5 ).

[0058] In addition, in a specific implementation of the first embodiment of the present invention, the mounting seat 93 is in the shape of a cross (see Figure 5 ), the copper bushing 1 is fixed to the mounting seat 93 by fasteners, and the mounting seat 93 is fixed to the shell 8 by fasteners, so that the copper bushing 1 is better positioned between the mounting seat 93 and the shell 8, ensuring the stability of the copper bushing 1 and the stable operation of the drive shaft 92.

[0059] Furthermore, the front and rear sides of the second end portion 12 of the copper bushing 1 are wrapped by the mounting seat 93 and the housing 8 (see Figure 1 The upper and lower sides of the second end 12 of the copper bushing 1 are enclosed by an "X"-shaped mounting seat 93, with the left and right sides of the second end 12 of the copper bushing 1 exposed from the "X"-shaped mounting seat 93. The oil filling hole 121 and the exhaust hole 123 are located on the left and right sides of the second end 12, respectively. This design not only secures the copper bushing 1 in place, but also makes the placement of the oil filling hole 121 and the exhaust hole 123 more reasonable, allowing for better exhaust and oil filling during subsequent maintenance, reducing maintenance difficulty.

[0060] In the first embodiment of the present invention, the copper bushing 1 is a bushing structure made of tin bronze. The copper bushing 1 and the DDC drive shaft 92 made of this material move relative to each other. Tin bronze has a self-lubricating effect, and the lubricating oil in the oil storage chamber 13 allows relative movement, eliminates the sliding bearing structure, and saves costs.

[0061] Embodiment 2: Embodiment 2 of the present invention proposes a centrifugal compressor, which uses the disassembly-free and easy-to-maintain rotary shaft sealing structure as described in Embodiment 1 of the present invention.

[0062] In the second embodiment of the present invention, the airflow adjustment mechanism 9 is installed on the housing 8, and the driver 91 of the airflow adjustment mechanism 9 is installed on the outside of the centrifugal compressor housing 8 by the mounting seat 93. The drive shaft 92 connected to the driver 91 extends into the interior of the housing 8 and is transmitted through the coupling and the transmission structure to adjust the DDC drive ring 7, thereby adjusting the airflow.

[0063] Next, the solution of the present utility model is described with a specific detailed embodiment.

[0064] In this detailed embodiment, an airflow regulating mechanism 9 is installed on the casing 8 in the centrifugal compressor, and the airflow regulating mechanism 9 includes a driver 91 and a mounting seat 93 installed on the centrifugal compressor casing 8. The driver 91 is connected to a drive shaft 92 extending into the interior of the casing 8. The drive shaft 92 is a rotating shaft. The sealing structure includes a copper bushing 1 arranged between the mounting seat 93 and the casing 8 and sleeved on the rotating shaft. The mounting seat 93 is in the shape of an "X". The copper bushing 1 is fixed to the mounting seat 93 by fasteners, and the mounting seat 93 is fixed to the casing 8 by fasteners.

[0065] In this detailed embodiment, the copper bushing 1 is a bushing structure made of tin bronze material. The copper bushing 1 has a first end 11 and a second end 12 that are perpendicular to each other. The first end 11 and the second end 12 form a T-shaped structure; a mounting groove 81 is opened in the shell 8, and the first end 11 of the copper bushing 1 is assembled into the mounting groove 81, and the second end 12 of the copper bushing 1 is positioned and connected to the mounting seat 93.

[0066] In this detailed embodiment, the inner wall of the copper bushing 1 has a cavity. After the copper bushing 1 is assembled onto the drive shaft 92, an annular oil storage chamber 13 is formed between the inner wall cavity of the copper bushing 1 and the outer wall of the drive shaft 92. The outer wall of the copper bushing 1 is provided with an oil filling hole 121 and an exhaust hole 123. Both the oil filling hole 121 and the exhaust hole 123 are connected to the oil storage chamber 13. The oil filling hole 121 and the exhaust hole 123 are exposed outside the mounting seat 93. The oil filling hole 121 is equipped with an oil filling nozzle 122, and the exhaust hole 123 is equipped with a detachable plug 124. The oil filling hole 121 and the exhaust hole 123 are provided on the second end portion 12, and the oil storage chamber 13 is located in the middle portion between the first end portion 11 and the second end portion 12. The front and rear sides of the second end 12 of the copper bushing 1 are wrapped by the mounting seat 93 and the shell 8, the upper and lower sides of the second end 12 of the copper bushing 1 are wrapped by the X-shaped mounting seat 93, and the left and right sides of the second end 12 of the copper bushing 1 are exposed to the X-shaped mounting seat 93. One of the oil filling hole 121 and the exhaust hole 123 is located on the left side of the second end 12, and the other is located on the right side of the second end 12.

[0067] In this detailed embodiment, the inner wall of the copper bushing 1 is provided with radial sealing grooves 14 on both the front and rear sides of the oil reservoir 13. An end face sealing groove 125 is provided where the copper bushing 1 abuts the housing 8. A radial sealing ring 2 is fitted into each of the radial sealing grooves 14, while an end face sealing ring 3 is fitted into the end face sealing groove 125. One of the two radial sealing grooves 14 is provided on the inner wall of the first end portion 11, and the other is provided on the inner wall of the second end portion 12. The end face sealing groove 125 is provided on the end surface of the second end portion 12 facing the first end portion 11.

[0068] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A rotary shaft sealing structure that is easy to maintain and requires no disassembly, and is used for sealing an airflow regulating mechanism (9) in a centrifugal compressor, wherein the airflow regulating mechanism (9) comprises a driver (91) and a mounting seat (93) mounted on a centrifugal compressor housing (8), wherein the driver (91) is connected to a drive shaft (92) extending into the housing (8), wherein the drive shaft (92) is a rotary shaft; and wherein: The sealing structure includes a copper bushing (1) disposed between a mounting seat (93) and a housing (8) and sleeved on the rotating shaft; The inner wall of the copper bushing (1) has a cavity, and after the copper bushing (1) is assembled on the drive shaft (92), an annular oil storage cavity (13) is formed between the inner wall cavity of the copper bushing (1) and the outer wall of the drive shaft (92); An oil filling hole (121) and an exhaust hole (123) are provided on the outer wall of the copper bushing (1); the oil filling hole (121) and the exhaust hole (123) are both connected to the oil storage chamber (13); the oil filling hole (121) and the exhaust hole (123) are exposed outside the mounting seat (93); the oil filling hole (121) is equipped with an oil filling nozzle (122); and the exhaust hole (123) is equipped with a detachable plug (124); The inner wall of the copper bushing (1) is provided with radial sealing grooves (14) on both the front and rear sides of the oil storage cavity (13); an end face sealing groove (125) is provided at the portion where the copper bushing (1) abuts the housing (8); radial sealing rings (2) are installed in the two radial sealing grooves (14), and an end face sealing ring (3) is installed in the end face sealing groove (125).

2. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to claim 1, characterized in that: The copper bushing (1) has a first end (11) and a second end (12) that are perpendicular to each other, and the first end (11) and the second end (12) form a T-shaped structure. A mounting groove (81) is provided in the housing (8), and the first end (11) of the copper bushing (1) is assembled into the mounting groove (81), and the second end (12) of the copper bushing (1) is positioned and connected to the mounting seat (93).

3. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to claim 2, characterized in that: Of the two radial sealing grooves (14), one is provided on the inner wall of the first end portion (11), and the other is provided on the inner wall of the second end portion (12); the end face sealing groove (125) is provided on the end face of the second end portion (12) facing the first end portion (11).

4. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to claim 2, characterized in that: The oil filling hole (121) and the exhaust hole (123) are arranged on the second end portion (12), and the oil storage chamber (13) is located in the middle portion between the first end portion (11) and the second end portion (12).

5. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to claim 4, characterized in that: The mounting seat (93) is in the shape of an "X"; the copper bushing (1) is fixed to the mounting seat (93) via a fastener; and the mounting seat (93) is fixed to the housing (8) via a fastener.

6. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to claim 5, characterized in that: The front and rear sides of the second end (12) of the copper bushing (1) are wrapped by the mounting seat (93) and the shell (8), the upper and lower sides of the second end (12) of the copper bushing (1) are wrapped by the "X"-shaped mounting seat (93), the left and right sides of the second end (12) of the copper bushing (1) are exposed to the "X"-shaped mounting seat (93), and one of the oil filling hole (121) and the exhaust hole (123) is located on the left side of the second end (12), and the other is located on the right side of the second end (12).

7. The disassembly-free and maintenance-friendly rotary shaft sealing structure according to any one of claims 1 to 6, characterized in that: The copper bushing (1) is a bushing structure made of tin bronze.

8. A centrifugal compressor, characterized in that: The centrifugal compressor uses the disassembly-free and maintenance-friendly rotating shaft sealing structure according to any one of claims 1 to 7.

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