Turbine machine and dynamic balance adjusting method

Abstract

The embodiment of the invention discloses a turbo machine and a dynamic balance adjusting method, and the turbo machine comprises a machine shell and a rotating mechanism. The rotating mechanism comprises a rotating shaft, a thrust disc, a mass center adjusting piece and an impeller. The rotating shaft is rotatably arranged on the machine shell and used for being in transmission connection with a motor rotor. The thrust disc is arranged on the periphery of the rotating shaft in a sleeving mode and connected with the rotating shaft to balance the axial force of the rotating shaft. The mass center adjusting piece comprises a shaft sleeve and a balance weight part arranged on the shaft sleeve, the shaft sleeve is arranged on the periphery of the rotating shaft in a sleeving mode and located on the side, in the axial direction of the rotating shaft, of the thrust disc, and the balance weight part is used for adjusting the position of the mass center of the mass center adjusting piece in the radial direction of the rotating shaft. The impeller is in transmission connection with the rotating shaft, and the thrust disc and the shaft sleeve are clamped between the impeller and the rotating shaft. According to the embodiment of the invention, the axial length of the rotating mechanism is shortened under the condition that the dynamic balance effect of the rotating mechanism is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of turbine machinery, and in particular to a turbine machinery and a dynamic balancing adjustment method. Background Art

[0002] Turbine machinery is used to convert electrical energy from a motor into mechanical energy and vice versa, and is widely used in the energy, chemical and other industries. Turbine machinery is, for example, a centrifugal compressor or a centrifugal expander. A centrifugal compressor can pressurize the process medium to a suitable pressure for various chemical reactions. A centrifugal expander can recover the energy of the process medium for refrigeration or power generation cycles.

[0003] The turbine machinery includes a casing and a rotating mechanism rotatably arranged on the casing. The rotating mechanism usually includes a rotating shaft, a motor rotor part, a bearing rotor part, structural parts, and working elements such as impellers. From the middle section to the two ends of the rotating mechanism, they are: motor rotor (magnetic steel part), bearing rotor (such as radial magnetic bearing rotor, axial magnetic bearing thrust plate), other sealing structural parts, sleeves, and impellers. The sleeve is used to limit the axial position of the axial magnetic bearing thrust plate. The sleeve and the rotating shaft usually adopt a clearance fit, that is, the sleeve is first installed at the shaft head position at the end of the rotating shaft, and then the impeller is installed. Finally, the impeller and the sleeve are tightened at one time through the pull rod-lock nut. When debugging this method, all the parts at the end of the rotating mechanism must be installed in place before debugging, otherwise the unfixed sleeve will be thrown out.

[0004] In the prior art, balancing end plates are generally provided on both sides of the magnetic steel part in the middle section of the rotating mechanism. In dynamic balancing adjustment, the material on the weight balancing end plates is removed. This method will cause the axial length of the rotating mechanism to be lengthened, which may cause the critical speed of the high-speed rotating mechanism to drop and damage the rotating mechanism. Moreover, once the rotating mechanism is assembled in the housing, the position where the weight is removed is blocked and dynamic balancing cannot be performed again. Summary of the invention

[0005] The embodiments of the present application provide a turbine machinery and a dynamic balancing adjustment method to ensure the dynamic balancing effect of a rotating mechanism and shorten the axial length of the rotating mechanism.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] On the one hand, a turbine machine is provided for converting mechanical energy and electrical energy into each other, and the turbine machine includes a casing and a rotating mechanism. The rotating mechanism includes a rotating shaft, a thrust plate, a center of mass adjustment member, and an impeller. The rotating shaft is rotatably arranged on the casing, and the rotating shaft is used for transmission connection with the motor rotor. The thrust plate is sleeved on the outer circumference of the rotating shaft, and the thrust plate is connected to the rotating shaft to balance the axial force of the rotating shaft. The center of mass adjustment member includes a sleeve and a counterweight portion arranged on the sleeve, the sleeve is sleeved on the outer circumference of the rotating shaft and is located on one side of the thrust plate in the axial direction of the rotating shaft, and the counterweight portion is used to adjust the position of the mass center of the center of mass adjustment member in the radial direction of the rotating shaft. The impeller is transmission-connected to the rotating shaft, and the thrust plate and the sleeve are clamped between the impeller and the rotating shaft.

[0008] In addition to or as an alternative to one or more of the features disclosed above, the housing includes a first shell and a second shell connected to each other, the first shell is arranged to form a motor cavity, and the second shell is arranged to form a process gas cavity. The rotating shaft is rotatably arranged in the first shell, the rotating shaft passes through the motor cavity, and one end of the rotating shaft extends into the process gas cavity; the impeller and the center of mass adjustment member are located in the process gas cavity.

[0009] In addition to or as an alternative to one or more of the features disclosed above, the sleeve is threadedly connected to the shaft, and the rotation direction of the connecting thread is opposite to the rotation direction of the shaft.

[0010] In addition to one or more of the features disclosed above, or as an alternative, the rotating shaft includes a first shaft segment and a second shaft segment arranged coaxially, the outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment, and a shaft shoulder is formed at the connection between the first shaft segment and the second shaft segment; wherein the thrust plate and the shaft sleeve are respectively sleeved on the outer circumference of the first shaft segment, the impeller is connected to the first shaft segment, and the thrust plate and the shaft sleeve are clamped between the impeller and the shaft shoulder.

[0011] In addition to one or more of the features disclosed above, or as an alternative, the sleeve includes a sleeve body and a detection portion, and the detection portion is arranged on the outer peripheral side wall of the sleeve body; the turbine machinery also includes a detector, the detector is arranged corresponding to the detection portion, and the detection portion is used to trigger the detector.

[0012] In addition to or as an alternative to one or more of the features disclosed above, the detection portion is a recess on the outer peripheral side wall of the sleeve body, and the detection portion extends radially inwardly along the sleeve.

[0013] In addition to one or more of the features disclosed above, or as an alternative, the sleeve further comprises a plurality of mounting portions, wherein the plurality of mounting portions are arranged around the rotating shaft and spaced apart on the sleeve body, and the counterweight portion is detachably mounted on the sleeve body via at least one mounting portion.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the sleeve body has a central plane perpendicular to its own axis, and the sleeve body is symmetrically arranged about the central plane; the mounting portion is a countersunk hole and is arranged at one end of the sleeve body, the counterweight portion is a bolt matching the mounting portion, the counterweight portion is threadedly connected to the sleeve body through the mounting portion, and is embedded in the sleeve body.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the sleeve body has a central plane perpendicular to its own axis, the sleeve body is symmetrically arranged about the central plane, and a plurality of mounting portions are evenly spaced around the axis of the rotating shaft; wherein each mounting portion includes a first countersunk groove and a second countersunk groove arranged at both axial ends of the sleeve body, and the first countersunk groove and the second countersunk groove are symmetrically arranged about the central plane.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the sleeve also includes a protrusion and a sealing portion, wherein the protrusion is radially protruding from the outer wall of the sleeve body at one end close to the impeller; the sealing portion is arranged on the protrusion and is located on one side of the sleeve body along the axial direction of the rotating shaft and is arranged around the rotating shaft; the turbine machinery also includes a sealing member, which is arranged around the rotating shaft, and the sleeve body is matched with the sealing member through the sealing member along the axial concave-convex direction of the rotating shaft to form a labyrinth sealing structure.

[0017] In addition to one or more of the features disclosed above, or as an alternative, the mounting portion includes a first groove and a second groove arranged on the sleeve body at both ends of the axial direction, the first groove is located at one end of the second groove close to the protrusion, the volume of the first groove is smaller than the volume of the second groove, and the center of mass of the counterweight portion is located on the side of the center plane away from the protrusion, so that the center of mass of the sleeve is located on the axis of the sleeve and the center plane.

[0018] In addition to or as an alternative to one or more of the features disclosed above, there are multiple sealing parts, and the multiple sealing parts are arranged at intervals along the radial direction of the rotating shaft; and / or the sealing part protrudes from the sleeve along the axial direction of the rotating shaft.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the sleeve is a one-piece structure.

[0020] On the other hand, the present application provides a dynamic balancing adjustment method for a rotating mechanism of a turbine machinery, the dynamic balancing adjustment method comprising:

[0021] The rotating shaft of the rotating mechanism is rotatably arranged on the casing of the turbine machinery, and the rotating shaft is used for transmission connection with the motor rotor;

[0022] The thrust plate is sleeved on the outer circumference of the rotating shaft, and the thrust plate is connected to the rotating shaft to balance the axial force of the rotating shaft;

[0023] The shaft sleeve of the mass center adjusting member is sleeved on the outer periphery of the rotating shaft, and the shaft sleeve is located on one side of the thrust plate in the axial direction of the rotating shaft;

[0024] Check whether the mass center of the rotating mechanism is in the predetermined position;

[0025] If not, adjusting the mass center of the mass center adjusting member through the counterweight portion of the mass center adjusting member so that the mass center of the rotating mechanism is at a predetermined position;

[0026] The impeller of the rotating mechanism is connected to the rotating shaft through transmission, so that the impeller and the rotating shaft cooperate to clamp the thrust plate and the shaft sleeve.

[0027] One of the above technical solutions has the following advantages or beneficial effects:

[0028] In this technical solution, the existing shaft sleeve is used as the basic structure, and a counterweight is arranged on the shaft sleeve to achieve the adjustable position of the mass center of the mass center adjusting member, thereby adjusting the dynamic balance of the rotating mechanism. Compared with the prior art, the axial length of the rotating mechanism is shortened while ensuring the dynamic balance effect of the rotating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0030] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of a turbine machine of the present application;

[0031] Figure 2 yes Figure 1 An enlarged view of the partial view A in FIG.

[0032] Figure 3 yes Figure 1 A front view of a sleeve in the rotor assembly shown;

[0033] Figure 4 yes Figure 3 BB section view in;

[0034] Figure 5 is a schematic cross-sectional structure diagram of another embodiment of the turbine machinery of the present application;

[0035] Figure 6 FIG. 1 is a schematic cross-sectional view of another embodiment of the turbine machinery of the present application, omitting the casing;

[0036] Figure 7 yes Figure 6 An enlarged view of the partial view C in FIG.

[0037] Figure 8 It is a schematic cross-sectional structure diagram of another embodiment of the turbine machinery of the present application.

[0038] Explanation of the reference numerals: 10 - shaft; 20 - center of mass adjustment member; 210 - sleeve; 211 - sleeve body; 212 - mounting portion; 2121 - first countersunk groove; 2122 - second countersunk groove; 212a - first groove; 212b - second groove; 213 - detection portion; 214 - sealing portion; 215 - protrusion; 220 - counterweight portion; 30 - impeller; 40 - thrust plate; 50 - detector; 60 - sealing member; 70 - housing; 710 - first shell; 711 - motor cavity; 720 - second shell; 721 - process air cavity; 80 - motor rotor; 91 - pull rod; 92 - nut; M, center plane. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The turbine machinery of the embodiment of the present application is used to convert mechanical energy and electrical energy into each other. The turbine machinery is, for example, a centrifugal compressor or a centripetal expander.

[0042] See also Figure 1 . Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the turbine machinery of the present application.

[0043] In some embodiments, the turbine machine includes a casing 70 and a rotating mechanism. The rotating mechanism is rotatably disposed on the casing 70.

[0044] The housing 70 forms a flow path for the process medium. The rotating mechanism cooperates with the process medium to realize the mutual conversion between mechanical energy and electrical energy. The process medium is, for example, gas or liquid.

[0045] The rotating mechanism includes a rotating shaft 10 , a thrust plate 40 , a mass center adjusting member 20 and an impeller 30 .

[0046] The rotating shaft 10 is rotatably disposed on the housing 70, and the rotating shaft 10 is used for transmission connection with the motor rotor 80. Specifically, the motor rotor 80 is sleeved outside the rotating shaft 10. The rotating shaft 10 is rotatably connected to the housing 70 through a bearing 93.

[0047] The thrust plate 40 is sleeved on the outer circumference of the rotating shaft 10 , and the thrust plate 40 is connected to the rotating shaft 10 to balance the axial force of the rotating shaft 10 .

[0048] Specifically, the thrust plate 40 is made of a magnetic conductive material, and the thrust plate 40 cooperates with the axial magnetic bearing to form a magnetic circuit to provide the axial bearing force required by the rotating shaft 10, thereby balancing the axial force of the rotating shaft 10. The main function of the thrust plate 40 is to transmit the axial thrust of the rotating shaft 10 to the thrust bearing, thereby effectively balancing the axial force, preventing the rotating shaft 10 from moving due to the axial force, avoiding collision with the housing 70, and ensuring the stable operation of the rotating shaft 10.

[0049] The impeller 30 is drivingly connected to the rotating shaft 10 , and the thrust plate 40 and the shaft sleeve 210 are sandwiched between the impeller 30 and the rotating shaft 10 .

[0050] In some embodiments, a slot is provided on the end surface of the rotating shaft 10, and the impeller 30 is inserted into the slot along the axial direction of the rotating shaft 10, and is limitedly matched with the rotating shaft 10 around the axis of the rotating shaft 10, that is, the impeller 30 and the rotating shaft 10 are relatively fixed in the circumferential direction of the rotating shaft 10. The pull rod 91 and the nut 92 cooperate to lock the impeller 30 to the rotating shaft 10. The connection method between the impeller 30 and the rotating shaft 10 can refer to the prior art, and will not be repeated here.

[0051] Please also read Figure 2 . Figure 2 yes Figure 1 An enlarged view of detail view A in FIG.

[0052] In some embodiments, the rotating shaft 10 includes a first shaft section 120 and a second shaft section 110 which are coaxially arranged. The outer diameter of the first shaft section 120 is smaller than the outer diameter of the second shaft section 110, and a shaft shoulder 130 is formed at the connection between the first shaft section 120 and the second shaft section 110. The thrust plate 40 and the shaft sleeve 210 are respectively sleeved on the outer periphery of the first shaft section 120, the impeller 30 is connected to the first shaft section 120, and the thrust plate 40 and the shaft sleeve 210 are sandwiched between the impeller 30 and the shaft shoulder 130. The motor rotor 80 is sleeved outside the second shaft section 110.

[0053] The mass center of the mass adjusting member 20 is adjustable in the radial direction of the rotating shaft 10. Specifically, the mass adjusting member 20 includes a sleeve 210 and a counterweight 220 disposed on the sleeve 210. The sleeve 210 is sleeved on the outer periphery of the rotating shaft 10 and is located on one side of the thrust plate 40 in the axial direction of the rotating shaft 10. The counterweight 220 is used to adjust the mass center of the mass adjusting member 20 in the radial direction of the rotating shaft 10.

[0054] In an assembly scenario, the rotating shaft 10 is first assembled to the housing 70 , and then the thrust plate 40 , the center of mass adjustment member 20 and the impeller 30 are assembled to the rotating shaft 10 in sequence.

[0055] In this embodiment, the shaft sleeve 210 is used as the basic structure, and a counterweight portion 220 is provided on the shaft sleeve 210 to achieve the adjustable position of the mass center of the mass center adjusting member 20, thereby adjusting the dynamic balance of the rotating mechanism. Compared with the prior art, the axial length of the rotating mechanism is shortened while ensuring the dynamic balance effect of the rotating mechanism.

[0056] In some embodiments, the housing 70 includes a first housing 710 and a second housing 720 connected to each other. The first housing 710 is arranged to form a motor cavity 711. The second housing 720 is arranged to form a process air cavity 721. The shaft 10 is rotatably disposed in the first housing 710, and the shaft 10 passes through the motor cavity 711, and one end of the shaft 10 extends into the process air cavity 721. The impeller 30 and the center of mass adjustment member 20 are located in the process air cavity 721.

[0057] Specifically, in Figure 1 In the illustrated embodiment, the motor cavity 711 and the process gas cavity 721 are spaced apart along the axial direction of the rotating shaft 10 .

[0058] When assembling the turbine machinery, after the rotating mechanism is assembled to the first housing 710 , the center of mass adjustment member 20 is exposed, so as to facilitate dynamic balance adjustment of the rotating mechanism in the assembled state. After the adjustment is completed, the second housing 720 is assembled to the first housing 710 .

[0059] Such an arrangement makes it easier to perform dynamic balance adjustment on the rotating mechanism in the assembled state.

[0060] In other embodiments, the casing 70 may not have the second casing 720, that is, when the turbine machine is in use, the center of mass adjustment member 20 and the impeller 30 are exposed to the external environment.

[0061] In some embodiments, the centroid adjusting member 20 is threadedly connected to the shaft 10, and the rotation direction of the connecting thread is opposite to the rotation direction of the shaft 10. Specifically, the sleeve 210 is threadedly connected to the shaft 10, and the rotation direction of the connecting thread is opposite to the rotation direction of the shaft 10.

[0062] During the high-speed rotation of the rotating shaft 10 , the sleeve 210 is gradually tightened as the rotating shaft 10 rotates, thereby reducing the probability of the center of mass adjustment member 20 being separated from the rotating shaft 10 or shaking relative to the rotating shaft 10 .

[0063] In addition, since the center of mass adjustment member 20 is threadedly connected to the rotating shaft 10, the dynamic balance adjustment of the rotating mechanism can be performed in stages. The details are as follows:

[0064] In a dynamic balancing adjustment scenario, the rotating shaft 10 equipped with the thrust plate 40 and the mass center adjustment is dynamically balanced, and the impeller 30 is dynamically balanced separately, and then the impeller 30 is assembled to the rotating shaft 10. When the rotating shaft 10 equipped with the thrust plate 40 and the mass center adjustment is dynamically balanced, the rotating shaft 10 can be installed on the housing 70, or the rotating shaft 10 can be installed on a dynamic balancing machine.

[0065] For a rotating mechanism that rotates at high speed, in order to avoid damage to the rotating mechanism or safety accidents such as overspeeding in the event of a frequency converter failure or wiring error, it is very important to monitor the speed and direction of rotation of the rotating mechanism in real time. At present, the commonly used speed sensor is a Hall sensor, and a protrusion or groove is provided on the rotating shaft 10. When the rotating shaft 10 rotates, the speed sensor outputs a pulse signal, and the change in the magnetic field caused by the protrusion or groove can be used to analyze the speed and direction of rotation of the rotating shaft 10. Grooves or protrusions must be provided on the rotating shaft 10, and space must be reserved for the probe of the speed sensor, which usually leads to an increase in the axial length of the rotating mechanism.

[0066] In some embodiments, the sleeve 210 includes a sleeve body 211, a mounting portion 212, and a detection portion 213. The detection portion 213 is disposed on the outer peripheral side wall of the sleeve body 211. The turbine machine further includes a detector 50, which is disposed corresponding to the detection portion 213, and the detection portion 213 is used to trigger the detector 50.

[0067] Specifically, the detector 50 can be arranged on the housing 70, opposite to and spaced from the detection portion 213. The detector 50 can be a Hall sensor. The detection portion 213 is a depression on the outer peripheral side wall of the sleeve body 211, and the detection portion 213 extends radially inward along the sleeve 210. In other embodiments, the detection portion 213 can also be a protrusion on the outer peripheral side wall of the sleeve body 211.

[0068] The detection unit 213 cooperates with the detector 50 to detect the rotation speed and / or rotation direction of the rotating mechanism.

[0069] During the rotation of the shaft 10, the probe of the detector 50 sweeps across each detection part 213, causing a magnetic field change that is collected. The faster the magnetic field change is collected, the faster the rotation speed of the shaft 10 is. The real-time rotation speed can be analyzed through the collection rate.

[0070] Integrating the detection portion 213 into the sleeve 210 avoids the need to separately provide the detection portion 213 on the rotating shaft 10 , thereby avoiding an increase in the axial length of the rotating mechanism.

[0071] In an assembly scenario, the detection portion 213 can be matched with the installation tool so that the detection portion 213 serves as the force point of the center of mass adjustment member 20, thereby driving the sleeve 210 to rotate, and then the sleeve 210 is threadedly connected to the rotating shaft 10. For example, in an embodiment where the detection portion 213 is concave, the installation tool can be inserted into the detection portion 213 to drive the sleeve 210 to rotate, so that the sleeve 210 is threadedly connected to the rotating shaft 10.

[0072] The specific scheme of adjusting the mass center of the mass center adjusting member 20 is introduced below.

[0073] See also Figure 3 and Figure 4 . Figure 3 yes Figure 1 A front view of the sleeve 210 in the rotor assembly is shown. Figure 4 yes Figure 3 BB section view in.

[0074] In some embodiments, a plurality of mounting portions 212 are arranged around the rotating shaft 10 at intervals, and the counterweight portion 220 is detachably mounted on the sleeve 210 through at least one mounting portion 212. Specifically, the sleeve body 211 has a central plane M perpendicular to its own axis, and the sleeve body is symmetrically arranged about the central plane M; the mounting portion 212 is a countersunk hole and is arranged at one end of the sleeve body 211, and the counterweight portion 220 is a bolt matching the mounting portion 212, and the counterweight portion 220 is threadedly connected to the sleeve body 211 through the mounting portion 212, and is embedded in the sleeve body 211.

[0075] In the process of adjusting the mass center of mass adjustment, when the rotating mechanism rotates at a low speed on the dynamic balancing machine and shows unbalanced mass, a counterweight part 220 of corresponding weight can be installed on the mounting part 212 at a 180° symmetrical position on its circumference. Through multiple times of the above process, the unbalance amount of the rotating mechanism can meet the accuracy requirements.

[0076] In the prior art, if the counterweight method is used to perform dynamic balancing of the rotating mechanism, a circle of counterweight holes is generally set on the axial plane where the end of the impeller 30 contacts the nut 92. Since the end of the impeller 30 is usually very small, the counterweight radius is too small, and the dynamic balancing effect is not obvious. This method is usually only used for secondary dynamic balancing after the rotating mechanism is assembled. Once the impeller 30 is replaced after being worn, dynamic balancing must be re-adjusted.

[0077] In this embodiment, since the dynamic balancing weight holes of this method are distributed on the sleeve 210, their rotation radius and cross-sectional area are much larger than the weight holes at the head of the impeller 30, and the dynamic balancing effect is better than the traditional solution.

[0078] In some embodiments, for example Figure 4The counterweight portion 220 is disposed on a side of the sleeve 210 facing the impeller 30 in the axial direction of the rotating shaft 10 .

[0079] When the rotating mechanism is dynamically balanced in stages, the counterweight 220 is disposed on the side of the sleeve 210 facing the impeller 30 in the axial direction of the rotating shaft 10 , which makes it easier to install and remove the counterweight 220 .

[0080] In some embodiments, the mounting portion 212 is a countersunk hole, the counterweight portion 220 is a bolt matching the countersunk hole, and the counterweight portion 220 is threadedly connected to the sleeve 210 through the mounting portion 212 and is completely embedded in the sleeve 210. Specifically, after the counterweight portion 220 is installed on the sleeve 210, it will not protrude from the surface of the sleeve 210 facing the impeller 30.

[0081] With such arrangement, the impeller 30 directly contacts the sleeve 210 along the axial direction of the rotating shaft 10 , which can further reduce the axial dimension of the rotating mechanism.

[0082] In some embodiments, the shaft sleeve 210 is an integrated structure. Compared with a split structure, the structure of the shaft sleeve 210 is more stable during high-speed rotation.

[0083] In some embodiments, for example Figure 5 The sleeve body 211 has a central plane M perpendicular to its own axis, the sleeve body 211 is symmetrically arranged about the central plane M, and a plurality of mounting portions 212 are evenly spaced and arranged around the axis of the rotating shaft 10; wherein each mounting portion 212 includes a first countersunk groove 2121 and a second countersunk groove 2122 arranged at both axial ends of the sleeve body 211, and the first countersunk groove 2121 and the second countersunk groove 2122 are symmetrically arranged about the central plane M.

[0084] In the embodiment of the present application, the mounting portion 212 is designed to be a symmetrical structure relative to the center plane M to ensure uniform mass distribution of the sleeve 210 itself; during high-speed rotation, the uneven inertial force in the original design is prevented from causing vibration and imbalance of the sleeve 210, and the counterweight portion 220 is selected to have a structure with good thermal conductivity, such as a metal copper block, to promote uniform exchange of gas in the process gas cavity 721 on the impeller 30 side and the cooling gas mixed flow in the motor cavity 711 and act on the sleeve 210, further reducing the influence of thermal expansion and contraction of the sleeve 210.

[0085] See also Figure 6 and Figure 7 . Figure 6 FIG. 1 is a schematic cross-sectional view of another embodiment of the turbine machinery of the present application, in which the casing 70 is omitted. Figure 7 yes Figure 6 An enlarged view of detail view C in FIG.

[0086] In some embodiments, the sleeve 210 further includes a protrusion 215 and a sealing portion 214. The protrusion 215 is protruded along the radial direction of the sleeve body 211 on the outer side wall of one end of the sleeve body 211 close to the impeller 30; the sealing portion 214 is arranged on the protrusion 215 and is located on one side of the sleeve body 211 along the axial direction of the rotating shaft 10, and is arranged around the rotating shaft 10; the turbine machinery further includes a sealing member 60, which is arranged around the rotating shaft 10, and the sleeve body 211 cooperates with the sealing member 60 along the axial direction of the rotating shaft 10 through the sealing member 214 to form a labyrinth seal structure. Specifically, the number of the sealing members 214 is multiple, and the multiple sealing members 214 are arranged at intervals along the radial direction of the rotating shaft 10. The sealing member 214 protrudes from the sleeve 210 along the axial direction of the rotating shaft 10. In other embodiments, the sealing member 214 can also be a groove on the sleeve 210.

[0087] The above-mentioned labyrinth sealing structure enables the centroid adjusting member 20 to also have a sealing function to prevent the process medium in the motor cavity 711 and the process gas cavity 721 from mixing, and can be used in applications with high requirements for pneumatic efficiency and isolation of low-temperature medium gas.

[0088] Reference Figure 8 In some embodiments, the mounting portion 212 includes a first groove 212a and a second groove 212b disposed at both ends of the sleeve body 211 in the axial direction, the first groove 212a is located at one end of the second groove 212b close to the protrusion 215, the volume of the first groove 212a is smaller than the volume of the second groove 212b, and the center of mass of the counterweight portion 220 is located on the side of the center plane M away from the protrusion 215, so that the center of mass of the sleeve 210 is located on the axis of the sleeve 210 and the center plane M. That is, the center of mass of the sleeve 210 is balanced.

[0089] In the embodiment of the present application, since one end of the sleeve 210 protrudes radially to form a protrusion 215 for the purpose of sealing, this makes the sleeve 210 itself unbalanced. Therefore, the mounting portion 212 is designed to be asymmetric with respect to the center plane M. Specifically, through the asymmetric design of the first groove 212a and the second groove 212b, the counterweight portion 220 can balance the mass of the shaft protrusion 215 and keep the sleeve 210 balanced itself.

[0090] See also Figure 1 and Figure 2 The present application provides a dynamic balancing adjustment method for a rotating mechanism of a turbine machinery, the dynamic balancing adjustment method comprising:

[0091] The rotating shaft 10 of the rotating mechanism is rotatably arranged on the casing 70 of the turbine machine, and the rotating shaft 10 is used for transmission connection with the motor rotor 80;

[0092] The thrust plate 40 is sleeved on the outer periphery of the rotating shaft 10, and the thrust plate 40 is used to be connected with the housing 70 to limit the position of the rotating shaft 10 in its axial direction;

[0093] The shaft sleeve 210 of the mass center adjusting member 20 is sleeved on the outer periphery of the rotating shaft 10, and the shaft sleeve 210 is located on one side of the thrust plate 40 in the axial direction of the rotating shaft 10;

[0094] Check whether the mass center of the rotating mechanism is in the predetermined position;

[0095] If not, the mass center of the mass center adjusting member 20 is adjusted by the counterweight portion 220 of the mass center adjusting member 20 so that the mass center of the rotating mechanism is at a predetermined position;

[0096] The impeller 30 of the rotating mechanism is transmission-connected to the rotating shaft 10 , so that the impeller 30 and the rotating shaft 10 cooperate to clamp the thrust plate 40 and the shaft sleeve 210 .

[0097] Specifically, the predetermined position is on the axis of the rotating mechanism, or within a predetermined range of the radial distance from the axis of the rotating mechanism.

[0098] In summary, the turbine machinery provided by the embodiments of the present application has the following beneficial effects:

[0099] (1) During the dynamic balancing adjustment stage, the center of mass adjustment parts can be locked without installing the impeller, tie rod, lock nut and other connecting structures, which is conducive to simplifying the rotating mechanism structure and improving the adjustment efficiency.

[0100] (2) After the rotating mechanism is installed inside the casing, it can be easily dynamically balanced on site. Due to the increase in the distribution radius and size of the counterweight part, the adjustment effect of the unbalanced mass is better. When the impeller of the equipment is worn out after long-term use and needs to be replaced with a new impeller, it will not affect the dynamic balance of the rotating mechanism that has been completed.

[0101] (3) The detection part in the center of mass adjustment member can be used to assist in locking the shaft sleeve, and can also cooperate with the detector on the casing structure to detect the speed and rotation direction.

[0102] (4) The center of mass adjustment component integrates functions such as dynamic balancing and speed detection. Compared with the traditional method of independently installing the shaft sleeve and speed sensor, it shortens the axial length of the rotating mechanism, which is beneficial to increasing the critical speed of the rotating mechanism. It is of great significance for high-speed rotating mechanisms to avoid entering the critical mode influence and ensure stable and reliable operation.

[0103] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A turbomachinery for converting mechanical energy into electrical energy and vice versa, characterized in that: include: Housing (70); as well as A rotating mechanism, the rotating mechanism comprising: A rotating shaft (10) is rotatably disposed on the housing (70), and the rotating shaft (10) is used for transmission connection with the motor rotor (80); A thrust plate (40) is sleeved on the outer circumference of the rotating shaft (10), and the thrust plate (40) is connected to the rotating shaft (70) to balance the axial force of the rotating shaft (10); A center of mass adjusting member (20), the center of mass adjusting member (20) comprising a shaft sleeve (210) and a counterweight (220) arranged on the shaft sleeve (210), the shaft sleeve (210) being sleeved on the outer periphery of the rotating shaft (10) and being located on one side of the thrust plate (40) in the axial direction of the rotating shaft (10), the counterweight (220) being used for adjusting the position of the center of mass of the center of mass adjusting member (20) in the radial direction of the rotating shaft (10); and The impeller (30) is drivingly connected to the rotating shaft (10), and the thrust plate (40) and the shaft sleeve (210) are sandwiched between the impeller (30) and the rotating shaft (10).

2. The turbomachine according to claim 1, characterized in that: The housing (70) comprises a first shell (710) and a second shell (720) which are connected to each other, wherein the first shell (710) is arranged to form a motor cavity (711), and the second shell (720) is arranged to form a process air cavity (721); The rotating shaft (10) is rotatably disposed on the first housing (710), penetrates the motor cavity (711), and one end thereof extends into the process air cavity (721); The impeller (30) and the center of mass adjustment member (20) are located in the process air cavity (721).

3. The turbomachine according to claim 1, characterized in that: The shaft sleeve (210) is threadedly connected to the rotating shaft (10), and the rotation direction of the connecting thread is opposite to the rotation direction of the rotating shaft (10).

4. The turbomachine according to claim 1, characterized in that: The rotating shaft (10) comprises a first shaft section (110) and a second shaft section (120) which are coaxially arranged, the outer diameter of the first shaft section (110) is smaller than the outer diameter of the second shaft section (120), and a shaft shoulder (130) is formed at the connection between the first shaft section (110) and the second shaft section (120); The thrust plate (40) and the shaft sleeve (210) are respectively sleeved on the outer circumference of the first shaft section (110), the impeller (30) is connected to the first shaft section (110), and the thrust plate (40) and the shaft sleeve (210) are clamped between the impeller (30) and the shaft shoulder (130).

5. The turbomachine according to claim 3, characterized in that: The shaft sleeve (210) comprises a shaft sleeve body (211) and a detection portion (213), wherein the detection portion (213) is arranged on an outer peripheral side wall of the shaft sleeve body (211); The turbine machine further comprises a detector (50), wherein the detector (50) is arranged corresponding to the detection part (213), and the detection part (213) is used to trigger the detector (50).

6. The turbomachine according to claim 5, characterized in that: The detection portion (213) is a recess on the outer peripheral side wall of the shaft sleeve body (211), and the detection portion (213) extends radially inwardly along the shaft sleeve (210).

7. The turbomachine according to claim 5, characterized in that: The sleeve body (211) has a central plane (M) which is perpendicular to its own axis and passes through the sleeve body (211); the sleeve (210) further comprises a plurality of mounting portions (212); the plurality of mounting portions (212) are arranged around the rotating shaft (10) and spaced apart on the sleeve body (211); the counterweight portion (220) is detachably mounted on the sleeve body (211) via at least one of the mounting portions (212).

8. The turbomachine according to claim 7, characterized in that: The shaft sleeve body (211) is symmetrically arranged about the central plane (M); The mounting portion (212) is a countersunk hole and is arranged at one end of the shaft sleeve body (211); the counterweight portion (220) is a bolt matching the mounting portion (212); the counterweight portion (220) is threadedly connected to the shaft sleeve body (211) through the mounting portion (212) and is embedded in the shaft sleeve body (211).

9. The turbomachine according to claim 7, characterized in that: The shaft sleeve body (211) is symmetrically arranged about the central plane (M), and the plurality of mounting portions (212) are evenly spaced and arranged around the axis of the rotating shaft (10); Wherein, each of the mounting portions (212) comprises a first countersunk groove (2121) and a second countersunk groove (2122) arranged on the sleeve body (211) at both ends of the axial direction, and the first countersunk groove (2121) and the second countersunk groove (2122) are symmetrically arranged about the center plane (M).

10. The turbomachine according to claim 7, characterized in that: The shaft sleeve (210) further comprises a protruding portion (215) and a sealing portion (214); the protruding portion (215) is protrudingly provided on an outer side wall of one end of the shaft sleeve body (211) close to the impeller along the radial direction of the shaft sleeve body (211); the sealing portion (214) is provided on the protruding portion (215) and is located on one side of the shaft sleeve body (211) along the axial direction of the rotating shaft (10), and is arranged around the rotating shaft (10); The turbine machine also includes a sealing member (60) which is arranged around the rotating shaft (10). The sleeve body (211) cooperates with the sealing member (60) along the axial direction of the rotating shaft (10) through the sealing portion (214) to form a labyrinth sealing structure.

11. The turbomachine according to claim 10, characterized in that: The mounting portion (212) comprises a first groove (212a) and a second groove (212b) which are arranged on the sleeve body (211) at both ends of the axial direction. The first groove (212a) and the second groove (212b) are arranged on both sides of the center plane (M). The first groove (212a) is located at one end of the second groove (212b) close to the protrusion (215). The volume of the first groove (212a) is smaller than the volume of the second groove (212b). The center of mass of the counterweight portion (220) is located on the side of the center plane (M) away from the protrusion (215), so that the center of mass of the sleeve (210) is located on the axis of the sleeve (210) and the center plane (M).

12. The turbomachine according to claim 10, characterized in that: The number of the sealing parts (214) is plural, and the plurality of sealing parts (214) are arranged at intervals along the radial direction of the rotating shaft (10); and / or The sealing portion (214) protrudes from the shaft sleeve body (211) along the axial direction of the rotating shaft (10).

13. The turbomachine according to claim 1, characterized in that: The shaft sleeve (210) is an integral structure.

14. A dynamic balancing method for a rotating mechanism of a turbine machine, characterized in that: The dynamic balance adjustment method comprises: The rotating shaft (10) of the rotating mechanism is rotatably arranged on the casing (70) of the turbine machine, and the rotating shaft (10) is used for transmission connection with the motor rotor; A thrust plate (40) is sleeved on the outer circumference of the rotating shaft (10), and the thrust plate (40) is connected to the rotating shaft (70) to balance the axial force of the rotating shaft (10); The shaft sleeve (210) of the mass center adjusting member (20) is sleeved on the outer periphery of the rotating shaft (10), and the shaft sleeve (210) is located on one side of the thrust plate (40) in the axial direction of the rotating shaft (10); detecting whether the mass center of the rotating mechanism is at a predetermined position; If not, adjusting the mass center of the mass center adjusting member (20) by means of the counterweight portion (220) of the mass center adjusting member (20) so that the mass center of the rotating mechanism is at the predetermined position; The impeller (30) of the rotating mechanism is transmission-connected to the rotating shaft (10), so that the impeller (30) and the rotating shaft (10) cooperate to clamp the thrust plate (40) and the shaft sleeve (210).

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