Thrust disc assembling structure and centrifugal compressor

Abstract

The utility model provides a thrust disc assembly structure and a centrifugal compressor, the thrust disc assembly structure comprises a main shaft and a thrust disc arranged on the main shaft in a sleeving mode, the thrust disc comprises a positive thrust acting surface and a negative thrust acting surface, the positive thrust acting surface is used for bearing positive residual thrust, the negative thrust acting surface is used for bearing negative residual thrust, and the negative residual thrust acting surface is used for bearing negative residual thrust. The main shaft is sleeved with a positioning ring, the positioning ring is arranged on the forward thrust acting face of the thrust disc, a nut is arranged at the end of the main shaft, and the nut is used for pressing the positioning ring. And the negative residual thrust acting on the thrust disc is transmitted to the positioning ring and is borne by the positioning ring, so that the service life of the main shaft is prolonged, and the normal operation of the compressor is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of centrifugal compressors, and particularly relates to a thrust disc assembly structure and a centrifugal compressor. BACKGROUND

[0002] The residual thrust of a centrifugal compressor rotor is transmitted to a thrust bearing through a thrust disc on the rotor. In general, the residual thrust of the rotor is a positive residual thrust, which makes the thrust disc lean against an adjusting pad behind it and finally acts on the shaft shoulder of the main shaft. With the complexity and variability requirements of modern process flows, the rotor may be subjected to a negative residual thrust in the opposite direction of the positive residual thrust during the start-up and shutdown of some process flows or units. In the traditional thrust disc assembly structure, the thrust disc transmits the negative residual thrust to a nut and finally bears it through the threads on the main shaft. In some specific working conditions, the negative residual thrust value is large, or the residual thrust direction is repeatedly converted in various variable working conditions, which may easily cause fatigue damage of the threads on the main shaft, affecting the normal operation of the compressor. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the application provides a thrust disc assembly structure and a centrifugal compressor, which at least solve one technical problem in the prior art.

[0004] In order to solve the above problems, the application provides a thrust disc assembly structure in the first aspect, which comprises a main shaft and a thrust disc sleeved on the main shaft. The thrust disc comprises a positive thrust acting surface and a negative thrust acting surface. The positive thrust acting surface is used for bearing a positive residual thrust, and the negative thrust acting surface is used for bearing a negative residual thrust. A positioning ring is sleeved on the main shaft and arranged on the positive thrust acting surface of the thrust disc. A nut is arranged at the end of the main shaft and used for pressing the positioning ring.

[0005] The negative residual thrust acting on the thrust disc is transmitted to the positioning ring and borne by the positioning ring.

[0006] Optionally, the outer circumferential surface of the main shaft is provided with a sink groove, and the positioning ring is arranged in the sink groove.

[0007] Optionally, the positioning ring is a stepped structure comprising an equal-diameter section and a variable-diameter section. The equal-diameter section is connected with the variable-diameter section. The positioning ring is connected with the thrust disc through the equal-diameter section. The nut comprises an inner hole pressing section, which is a variable-diameter hole. The variable-diameter hole is used for cooperating with the variable-diameter section of the positioning ring to press the positioning ring.

[0008] Optionally, the variable-diameter section comprises a first end and a second end. The diameter of the variable-diameter section gradually increases in the direction from the first end to the second end. The variable-diameter section is connected with the equal-diameter section through the second end.

[0009] Optionally, the positioning ring is a two-half structure.

[0010] Optionally, the positioning ring comprises a first half ring and a second half ring, the first half ring and the second half ring are buckled together to form the positioning ring.

[0011] A first positioning hole is formed on the first half ring or the second half ring, an outwardly extending boss is arranged on the positive thrust surface of the thrust disc, a second positioning hole is formed at the edge of the boss, and a positioning screw passes through the first positioning hole and the second positioning hole to install the first half ring or the second half ring on the thrust disc.

[0012] Optionally, the nut further comprises an inner hole threaded segment, the hole diameter of the inner hole threaded segment is different from the hole diameter of the inner hole compression segment to form a shaft shoulder, an outer thread is arranged on the outer circumferential surface of the main shaft, and the inner hole threaded segment is connected with the outer thread to enable the nut to be screwed on the main shaft.

[0013] Optionally, a through hole is formed in the end face of the nut for the hydraulic system oil supply pipeline to pass through.

[0014] Optionally, the main shaft further comprises a shaft shoulder table, and an adjusting pad sleeve is arranged on the main shaft and located between the shaft shoulder table and the thrust disc.

[0015] The second aspect of the present application provides a centrifugal compressor comprising the thrust disc assembly structure according to any one of the above.

[0016] Advantages

[0017] The thrust disc assembly structure and the centrifugal compressor provided by the embodiment of the present application have the positioning ring sleeved on the main shaft, and one end of the positioning ring is fixed on the thrust disc. At this time, the negative residual thrust acting on the thrust disc is transmitted to the positioning ring, the positioning ring bears the negative residual thrust and finally transmits it to the main shaft, thereby solving the technical problem that the negative residual thrust is transmitted to the nut by the thrust disc in the prior art and is finally borne by the thread on the main shaft, which causes the thread on the main shaft to be damaged due to fatigue and affects the normal operation of the compressor, and the service life of the main shaft is improved to ensure the normal operation of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 FIG. 1 is a schematic diagram of the thrust disc assembly structure of the present application;

[0019] Fig. 2 FIG. 3 is a front view of the positioning ring of the present application;

[0020] Fig. 3 FIG. 4 is a sectional view of the positioning ring of the present application.

[0021] Reference signs are indicated as:

[0022] 1, main shaft;

[0023] 2, adjusting pad;

[0024] 3, thrust disc; 301, positive thrust surface; 302, negative thrust surface;

[0025] 4, positioning ring; 401, first half ring; 402, second half ring; 403, first positioning hole; 404, variable diameter section;

[0026] 5, positioning screw;

[0027] 6, nut;

[0028] 7, assembly hydraulic interface;

[0029] 8, oil groove. DETAILED DESCRIPTION

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0034] In combination with the drawings Figs. 1 to 3 According to the first aspect of the application, a thrust disc assembly structure is provided, which comprises a main shaft 1 and a thrust disc 3 sleeved on the main shaft 1, the thrust disc 3 comprises a positive thrust surface 301 and a negative thrust surface 302, the positive thrust surface 301 is used to bear the positive residual thrust, the negative thrust surface 302 is used to bear the negative residual thrust, a positioning ring 4 is sleeved on the main shaft 1, the positioning ring 4 is arranged on the positive thrust surface 301 of the thrust disc 3, and a nut 6 is arranged at the end of the main shaft 1, and the nut 6 is used to compress the positioning ring 4.

[0035] The negative residual thrust acting on the thrust disc 3 is transmitted to the positioning ring 4 and is borne by the positioning ring 4.

[0036] The positioning ring 4 is sleeved on the main shaft 1 and is fixed at one end on the thrust disc 3, at this time, the negative residual thrust acting on the thrust disc 3 is transmitted to the positioning ring 4, the positioning ring 4 bears the negative residual thrust and finally transmits it to the main shaft 1, thereby solving the technical problem that in the prior art, the thrust disc 3 transmits the negative residual thrust to the nut 6 and finally bears it by the thread on the main shaft 1, which causes the thread on the main shaft 1 to be damaged due to fatigue, and affects the normal operation of the compressor, the service life of the main shaft 1 is improved, and the normal operation of the compressor is ensured.

[0037] The thrust disc 3 comprises a positive thrust surface 301 and a negative thrust surface 302, that is, the positive thrust surface 301 and the negative thrust surface 302 are arranged oppositely.

[0038] The positive thrust surface 301 is used to bear the positive residual thrust, and the negative thrust surface 302 is used to bear the negative residual thrust, that is, the directions of the positive residual thrust and the negative residual thrust are opposite to each other.

[0039] The positioning ring 4 is arranged on the positive thrust surface 301 of the thrust disc 3, the end of the main shaft 1 is provided with the nut 6, and the nut 6 is used to compress the positioning ring 4, that is, at least part of the positioning ring 4 is fixed on the positive thrust surface 301 of the thrust disc 3, and the radial position of part of the positioning ring 4 is limited by the thrust disc 3; when the nut 6 is screwed on the main shaft 1, the end of the nut 6 cooperates with the outer circumferential surface of the positioning ring 4, so that the positioning ring 4 is compressed.

[0040] The thrust disc 3 and the main shaft 1 are in a taper face small interference fit.

[0041] Specifically, a hexagonal counterbore for disc wheel turning and a hydraulic interface for assembly are sequentially arranged on the end face of the main shaft 1 along the axial direction, an oil outlet is arranged on the main shaft 1 along the radial direction, the oil outlet is in communication with the hydraulic interface for assembly, an oil groove is arranged at the inner hole of the thrust disc, the oil outlet end of the hydraulic system is connected to the hydraulic interface for assembly, and the hydraulic oil is filled into the oil groove, so that the thrust disc 3 is deformed slightly under the action of the pressure, and then the thrust disc 3 is installed on the main shaft 1 or disassembled from the main shaft 1.

[0042] The outer circumferential surface of the main shaft 1 is provided with a sink groove, and the positioning ring 4 is arranged in the sink groove.

[0043] The sink groove is an annular groove arranged on the outer circumferential surface of the main shaft 1, and the positioning ring 4 is installed in the annular groove to limit the axial position of the positioning ring 4; the thrust disc 3 is clamped by the positioning ring 4 after being installed to the specified position, and at this time the positioning ring 4 also limits the axial position of the thrust disc 3.

[0044] Specifically, the cross-sectional shape of the sink groove is consistent with the cross-sectional shape of the positioning ring 4, so as to ensure that the surface of the positioning ring 4 fully matches the groove wall of the sink groove, so that the installation stability between the two is high.

[0045] The positioning ring 4 is a stepped structure including a constant-diameter section and a variable-diameter section 404, the constant-diameter section is connected with the variable-diameter section 404, the positioning ring 4 is connected with the thrust disc 3 through the constant-diameter section, and the nut 6 includes an inner hole compression section which is a variable-diameter hole and is used for cooperating with the variable-diameter section 404 of the positioning ring 4 to compress the positioning ring 4.

[0046] The cooperation between the nut 6 and the positioning ring 4 adopts a taper surface compression form, and when the nut 6 is tightened, the positioning ring 4 is compressed in the sink groove to prevent the positioning ring 4 from being loosened in the radial direction.

[0047] The variable-diameter section 404 includes a first end and a second end, and the diameter of the variable-diameter section 404 gradually increases in the direction from the first end to the second end, and the variable-diameter section 404 is connected with the constant-diameter section through the second end.

[0048] The diameter of the variable-diameter section 404 gradually increases in the direction from the first end to the second end, that is, the first end is the minimum diameter end of the variable-diameter section 404, and the second end is the maximum diameter end of the variable-diameter section 404.

[0049] The inner hole compression section of the thrust disc 3 is a variable-diameter hole, the variable-diameter hole includes a third end and a fourth end, and the diameter of the variable-diameter hole gradually increases in the direction from the third end to the fourth end. That is, the third end is the minimum diameter end of the variable-diameter hole, and the fourth end is the maximum diameter end of the variable-diameter hole.

[0050] Specifically, when the nut 6 is pressed against the positioning ring 4, the largest end of the variable-diameter hole of the nut 6 gradually moves from the smallest end of the variable-diameter section 404 of the positioning ring 4 to the largest end, so as to press the positioning ring 4.

[0051] The positioning ring 4 is a two-half structure.

[0052] In order to facilitate the installation of the positioning ring 4 into the sink groove of the main shaft 1, the positioning ring 4 is designed as a two-half structure.

[0053] Specifically, the two halves of the positioning ring 4 are the same size, each being one-half of the entire positioning ring 4.

[0054] The positioning ring 4 includes a first half ring 401 and a second half ring 402, which are buckled together to form the positioning ring 4.

[0055] A first positioning hole 403 is formed on the first half ring 401 or the second half ring 402, and an outwardly extending boss is provided on the positive thrust surface 301 of the thrust disc 3, and a second positioning hole is formed at the edge of the boss. The positioning screw 5 passes through the first positioning hole and the second positioning hole to install the first half ring 401 or the second half ring 402 on the thrust disc 3.

[0056] Among them, the first positioning hole is formed on the first half ring 401 or the second half ring 402, that is, the variable-diameter section 404 of the positioning ring 4 is first formed with a tool relief to facilitate drilling, and the length of the tool relief is equal to that of the variable-diameter section 404. Then a first positioning hole is formed on the constant-diameter section of the positioning ring 4.

[0057] Among them, an outwardly extending boss is provided on the positive thrust surface 301 of the thrust disc 3, and a second positioning hole is formed at the edge of the boss. Here, the second positioning hole is coaxially arranged with the first positioning hole.

[0058] Specifically, the outer diameter of the boss on the thrust disc 3 is the same as the outer diameter of the constant-diameter section of the positioning ring 4, that is, when the positioning ring 4 is completely installed in the sink groove and the inner hole of the positioning ring 4 is in contact with the groove bottom, the outer circumferential surface of the positioning ring 4 is flush with the outer circumferential surface of the boss. Used to determine whether the positioning ring 4 is installed in place in the radial direction.

[0059] Among them, the positioning screw 5 is screwed into the first positioning hole 403 and the second positioning hole in sequence, so as to fix the first half ring 401 or the second half ring 402 on the boss of the thrust disc 3, realizing that the circumferential position between the first half ring 401 or the second half ring 402 and the thrust disc 3 is unique.

[0060] The nut 6 further comprises an inner hole threaded section, the hole diameter of the inner hole threaded section is different from the hole diameter of the inner hole compression section to form a shoulder, the outer periphery of the main shaft 1 is provided with an external thread, the inner hole threaded section is connected with the external thread, so that the nut 6 is screwed on the main shaft 1.

[0061] The third end of the inner hole compression section, that is, the smallest end, is connected with the inner hole threaded section, the hole diameter of the inner hole threaded section is different from the hole diameter of the inner hole compression section to form a shoulder, when the shoulder end face of the nut abuts against the end face of the smallest end of the variable diameter section 404 of the positioning ring 4, it indicates that the inner hole compression section of the nut just compresses the variable diameter section 404 of the positioning ring 4, at this time, the outer periphery of the positioning ring 4 is flush with the outer periphery of the boss of the thrust disc 3.

[0062] The nut 6 is provided with a through hole at the end face for the hydraulic system oil supply pipeline to pass through.

[0063] The nut 6 is provided with a through hole at the end face for the hydraulic system oil supply pipeline to pass through, that is, through the through hole, the oil outlet of the hydraulic system can be connected to the hydraulic interface for assembly, so as to install or disassemble the thrust disc 3 by the hydraulic expansion.

[0064] The end face of the nut 6 has sufficient annular area and flatness, which can be used for monitoring the displacement of the rotor shaft.

[0065] The main shaft 1 further comprises a shoulder platform, the adjusting pad 2 is sleeved on the main shaft 1 and located between the shoulder platform and the thrust disc 3.

[0066] The positive residual thrust acts on the positive thrust acting surface 301 of the thrust disc 3, so that the thrust disc 3 is close to the adjusting pad 2 and finally acts on the shoulder platform of the main shaft 1, and the adjusting pad 2 is also used for adjusting the axial position of the thrust disc 3.

[0067] The outer periphery of the adjusting pad 2 is flush with the outer periphery of the shoulder platform, so as to avoid the local thrust concentration phenomenon of the shoulder platform in the transmission process of the positive residual thrust.

[0068] More specifically, when the thrust disc 3 is subjected to a negative residual thrust, the positioning ring 4 bears the negative residual thrust and finally transmits it to the main shaft 1, the strength of the sink groove and the positioning ring 4 is higher than the allowable stress value of the external thread of the main shaft 1, so as to avoid the negative residual thrust from causing fatigue damage of the external thread of the main shaft 1 and other events affecting the operation of the compressor.

[0069] The second aspect of the present application provides a centrifugal compressor comprising the thrust disc assembly structure according to any one of the above.

[0070] The positioning ring 4 is sleeved on the main shaft 1, and one end of the positioning ring 4 is fixed on the thrust disc 3, at this time, the negative residual thrust acting on the thrust disc 3 is transmitted to the positioning ring 4, the positioning ring 4 bears the negative residual thrust and finally transmits it to the main shaft 1, solving the technical problem that the negative residual thrust is transmitted to the nut 6 by the thrust disc 3 and finally borne by the thread on the main shaft 1 in the prior art, causing fatigue damage of the thread on the main shaft 1 and affecting the normal operation of the compressor, improving the service life of the main shaft 1 and ensuring the normal operation of the compressor.

[0071] Those skilled in the art can easily understand that the above-mentioned various advantageous modes can be freely combined and superimposed without conflict.

[0072] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, which should be regarded as the protection scope of the present application.

Claims

1. A thrust disc assembly structure comprising a main shaft (1) and a thrust disc (3) fitted on the main shaft (1), characterized in that, The thrust disc (3) comprises a positive thrust surface (301) for bearing positive residual thrust and a negative thrust surface (302) for bearing negative residual thrust, a positioning ring (4) is sleeved on the main shaft (1), the positioning ring (4) is arranged on the positive thrust surface (301) of the thrust disc (3), and a nut (6) is arranged at the end of the main shaft (1) and used for pressing the positioning ring (4). The negative residual thrust acting on the thrust disc (3) is transmitted to the positioning ring (4) and is borne by the positioning ring (4).

2. A thrust disc assembly according to claim 1, wherein The outer circumferential surface of the main shaft (1) is provided with a sink, and the positioning ring (4) is arranged in the sink.

3. The thrust disc assembly according to claim 1, wherein The positioning ring (4) is a stepped structure and comprises an equal-diameter section and a variable-diameter section (404), the equal-diameter section is connected with the variable-diameter section (404), the positioning ring (4) is connected with the thrust disc (3) through the equal-diameter section, the nut (6) comprises an inner hole pressing section, the inner hole pressing section is a variable-diameter hole, and the variable-diameter hole is used for cooperating with the variable-diameter section (404) of the positioning ring (4) to press the positioning ring (4).

4. A thrust disc assembly according to claim 3, wherein The variable-diameter section (404) comprises a first end and a second end, the diameter of the variable-diameter section (404) gradually increases in the direction from the first end to the second end, and the variable-diameter section (404) is connected with the equal-diameter section through the second end.

5. The thrust disc assembly according to claim 3, wherein The positioning ring (4) is a two-half structure.

6. A thrust disc assembly according to claim 5, wherein The positioning ring (4) comprises a first half ring (401) and a second half ring (402), and the first half ring (401) and the second half ring (402) are buckled together to form the positioning ring (4). A first positioning hole (403) is arranged on the first half ring (401) or the second half ring (402), an outwardly extending boss is arranged on the positive thrust surface (301) of the thrust disc (3), a second positioning hole is arranged at the edge of the boss, and a positioning screw (5) passes through the first positioning hole (403) and the second positioning hole to mount the first half ring (401) or the second half ring (402) on the thrust disc (3).

7. The thrust disc assembly according to claim 3, wherein The nut (6) further comprises an inner hole threaded section, the hole diameter of the inner hole threaded section is different from the hole diameter of the inner hole pressing section to form a shaft shoulder, the outer circumferential surface of the main shaft (1) is provided with an external thread, and the inner hole threaded section is connected with the external thread to enable the nut (6) to be screwed on the main shaft (1).

8. The thrust disc assembly according to claim 3, wherein A through hole is arranged on the end face of the nut (6) and is used for passing a hydraulic system oil supply pipeline.

9. The thrust disc assembly according to claim 1, wherein The main shaft (1) further comprises a shaft shoulder platform, an adjusting pad (2) is sleeved on the main shaft (1) and is located between the shaft shoulder platform and the thrust disc (3).

10. A centrifugal compressor characterized by, The thrust disc assembly structure comprises the thrust disc assembly structure according to any one of claims 1 to 9.

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