A closed impeller rotor sleeve and manufacturing method thereof

Abstract

The present invention discloses a closed impeller rotor sleeve and a manufacturing method thereof, wherein the rotor sleeve comprises a transmission shaft, an impeller, a sleeve and a guide cover; the transmission shaft is provided with a transition shaft core and a matching conical shaft core, the impeller is composed of an impeller housing and a supporting body therein, the supporting body is provided with a matching conical hole, and the matching conical shaft core is embedded in the matching conical hole; the transition shaft core is provided with a raised ring, and the sleeve is sleeved on the transition shaft core; the sleeve is also sleeved with a sleeve chuck, which clamps the sleeve and the supporting body of the impeller, and the sleeve chuck is also screwed with a sleeve locking bolt; the end of the matching conical shaft core is also sleeved with a locking pad and an anti-loosening pad, the outer walls of the locking pad and the anti-loosening pad are respectively clamped with the inner wall of the matching conical hole, and a locking nut is also screwed on the outside of the anti-loosening pad; the guide cover is arranged outside the transition shaft core and is fixed to the supporting body of the impeller by a pin.

Description

Technical field:

[0001] The present invention belongs to the technical field of closed impellers for compressors, and in particular relates to a closed impeller rotor sleeve and a manufacturing method thereof. Background technology:

[0002] The impeller rotor sleeve is an important component of the compressor. It is a component that drives the impeller through the drive shaft to realize kinetic energy transmission. The existing impeller rotor still has some shortcomings, such as: the assembly between the impeller and the drive shaft is not strong enough, and there is a risk of slight misalignment between the two under long-term operation, which affects the stability of the drive shaft and impeller operation; a large amount of heat will be generated at the connection between the drive shaft and the impeller during long-term operation, and certain wear will occur between the workpieces under thermal expansion conditions, which will have a certain impact on the service life of the equipment; in addition, during the manufacturing process, due to the large diameter of the impeller, if ordinary CNC vertical lathe processing is used, the speed of the impeller is subject to certain limitations, so the roughness of the tapered hole is difficult to meet the design requirements. Based on the above shortcomings, the existing impeller rotor sleeve needs further optimization.

[0003] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention:

[0004] The object of the present invention is to provide a closed impeller rotor sleeve and a manufacturing method thereof, so as to overcome the above-mentioned defects in the prior art.

[0005] To achieve the above objectives, the present invention provides a closed impeller rotor sleeve, comprising a transmission shaft, an impeller, a sleeve and a guide cover;

[0006] The transmission shaft is provided with a transition shaft core and a matching conical shaft core, the impeller is composed of an impeller housing and a supporting body therein, a matching conical hole is provided in the supporting body, and the matching conical shaft core is embedded in the matching conical hole;

[0007] The transition shaft core is provided with a raised ring, the shaft sleeve is sleeved on the transition shaft core, and one end of the shaft sleeve presses the support body of the impeller, and the other end is sleeved on the raised ring, and the interior of the shaft sleeve is fixed to the transition shaft core by a pin;

[0008] The shaft sleeve is also provided with a shaft sleeve chuck, which clamps the shaft sleeve and the impeller support body, and the shaft sleeve chuck is also screwed with a shaft sleeve locking bolt;

[0009] The end of the matching tapered shaft core is also covered with a locking washer and an anti-loosening washer, the outer walls of the locking washer and the anti-loosening washer are respectively clamped and matched with the inner wall of the tapered hole, and a locking nut is screwed on the outside of the anti-loosening washer, and the locking nut presses the locking washer and the anti-loosening washer;

[0010] The deflector cover is arranged outside the transition shaft core and is fixed to the support body of the impeller through pins.

[0011] Furthermore, as a preference, a plurality of inclined slots are provided on the outer wall of the mating conical shaft core.

[0012] Furthermore, preferably, a first fitting gap is left between the end face of the transition shaft core and the supporting body.

[0013] Furthermore, preferably, a second fitting gap is left between the end surface of the raised ring and the shaft sleeve.

[0014] Furthermore, preferably, a third fitting gap is left between the end of the fitting conical surface shaft core and the inner wall of the fitting conical hole.

[0015] Furthermore, as a preference, O-rings are provided at the contact points between the sleeve, the raised ring and the support body.

[0016] A method for manufacturing a closed impeller rotor sleeve comprises the following steps:

[0017] (1) Transmission shaft processing: First, the transmission shaft material is tested by ultrasonic flaw detector. After the flaw detection is qualified, heat treatment, rough turning, semi-finishing turning, and fine grinding are carried out to produce the matching tapered shaft core. After the processing is completed, penetrant flaw detection is carried out for standby use;

[0018] (2) Impeller rough machining: CNC vertical lathe is used to machine a matching tapered hole inside the impeller support body. During the machining process, a detection mandrel is used to detect the taper of the matching tapered hole. The fit between the matching tapered hole and the detection mandrel is greater than 80%;

[0019] (3) Impeller finishing: Use a grinding tool with a taper consistent with the taper of the detection mandrel to manually grind the matching tapered hole. After grinding, protect the inner surface of the matching tapered hole;

[0020] (4) Impeller counterweight: perform double-sided dynamic balancing on the impeller with an accuracy requirement of G1;

[0021] (5) Taper grinding: The large diameter of the impeller's matching tapered hole is facing upwards, a non-metallic tray is placed on the large diameter, and the level is aligned with a spirit level. The drive shaft is placed on a cylindrical grinder, and the angle is adjusted to grind the outer conical surface. During the grinding process, the angle is continuously adjusted to fit the angle of the matching tapered hole.

[0022] (6) After the transmission shaft is balanced and ground, the transmission shaft is dynamically balanced on both sides with an accuracy requirement of G1;

[0023] (7) Assembly: After the dynamic balancing of the transmission shaft is completed, the structure of claim 6 is assembled to form a closed impeller rotor housing.

[0024] Furthermore, as a preference, the grinding tooling used in the impeller fine machining in step (3) is provided with a grinding sand storage tank (10), and the sand and gravel produced during grinding are stored in the grinding sand storage tank (10).

[0025] Furthermore, as a preference, during the assembly of step (7), the impeller and the transmission shaft are aligned and then the impeller is slowly pushed so that the matching tapered hole of the impeller is sleeved onto the matching tapered surface core of the transmission shaft. After the installation is completed, the double-sided dynamic balancing of the rotor sleeve assembly is performed with an accuracy requirement of G1.

[0026] Compared with the prior art, one aspect of the present invention has the following beneficial effects:

[0027] (1) The transmission shaft of the present invention is provided with a matching conical shaft core, the impeller is provided with a matching conical hole, the transmission shaft and the impeller are connected through the conical surface, and the transmission shaft is also provided with a transition shaft core, the transition shaft core is also provided with a raised ring, the transition shaft core is covered with a shaft sleeve, and at the same time, one end of the shaft sleeve presses the impeller, and the other end covers the raised ring. The conical surface structure connection combined with the fixing effect of the shaft sleeve can make the connection between the transmission shaft and the impeller tighter, reduce the risk of misalignment between the two under long-term work, and ensure the stability of the operation of the transmission shaft and the impeller;

[0028] (2) A first fitting gap is left between the end face of the transition shaft core and the supporting body, a second fitting gap is left between the end face of the raised ring and the sleeve, and a third fitting gap is left between the end of the matching tapered shaft core and the inner wall of the matching tapered hole. The setting of multiple gaps can buffer the problem of workpiece wear caused by thermal expansion during long-term operation of the transmission shaft and the impeller, thereby extending the service life of the equipment;

[0029] (3) During manufacturing, the matching tapered hole of the impeller is first turned by a CNC vertical lathe and then manually ground using a grinding tool, which can improve the processing accuracy of the matching tapered hole; at the same time, during the preparation process, the impeller, drive shaft and rotor sleeve assembly are double-sided dynamically balanced, which can improve the overall manufacturing accuracy of the closed impeller rotor sleeve. Description of the drawings:

[0030] Figure 1 A schematic diagram of a closed impeller rotor housing according to the present invention;

[0031] Figure 2 A schematic diagram of an impeller with a closed impeller rotor sleeve according to the present invention;

[0032] Figure 3 A schematic diagram of a transmission shaft of a closed impeller rotor sleeve of the present invention;

[0033] Figure 4 It is a partial enlarged schematic diagram of the structure of a closed impeller rotor sleeve of the present invention;

[0034] Figure 5 is a schematic diagram of the grinding tool of the present invention;

[0035] The figures are marked as follows: 1-drive shaft, 101-transition shaft core, 102-matching conical shaft core, 103-raised ring, 104-locking pad, 105-anti-loosening gasket, 106-locking nut, 107-inclined slot, 2-impeller, 201-impeller housing, 202-support body, 203-matching tapered hole, 3-sleeve, 301-sleeve chuck, 302-sleeve locking bolt, 4-flow guide cover, 5-pin, 6-first matching gap, 7-second matching gap, 8-third matching gap, 9-O-ring, 10-abrasive sand storage tank. Specific implementation method:

[0036] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0037] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0038] Example 1:

[0039] like Figure 1-5 As shown, a closed impeller rotor sleeve includes a transmission shaft 1, an impeller 2, a sleeve 3 and a guide cover 4;

[0040] The transmission shaft 1 is provided with a transition shaft core 101 and a matching conical shaft core 102. The impeller 2 is composed of an impeller casing 201 and a supporting body 202 therein. A matching conical hole 203 is provided in the supporting body 202. The matching conical shaft core 102 is embedded in the matching conical hole 203. The transmission shaft 1 and the impeller 2 are matched through the conical surface and the conical hole. Compared with the traditional straight surface and straight hole matching, on the one hand, the assembly is more convenient, and on the other hand, the matching between the two is also tighter.

[0041] The transition shaft core 101 is provided with a raised ring 103, and the sleeve 3 is sleeved on the transition shaft core 101, and one end of the sleeve 3 presses the supporting body 202 of the impeller 2, and the other end is sleeved on the raised ring 103. The interior of the sleeve 3 is fixed to the transition shaft core 101 by a pin 5; the sleeve 3 is pressed on the raised ring 103, which can limit the position of the two ends of the sleeve 3, and is also more conducive to the stability of the structural connection between the drive shaft 1 and the impeller 2.

[0042] The shaft sleeve 3 is also provided with a shaft sleeve chuck 301, which clamps the shaft sleeve 3 and the support body 202 of the impeller 2. The shaft sleeve chuck 301 is also provided with a shaft sleeve locking bolt 302. The shaft sleeve chuck 301 and the shaft sleeve locking bolt 302 can lock the shaft sleeve 3, thereby further improving the stability of the structural connection between the transmission shaft 1 and the impeller 2.

[0043] The end of the mating conical shaft core 102 is also covered with a locking pad 104 and an anti-loosening pad 105. The outer walls of the locking pad 104 and the anti-loosening pad 105 are respectively clamped with the inner wall of the tapered hole 203. A locking nut 106 is also screwed on the outside of the anti-loosening pad 105. The locking nut 106 presses the locking pad 104 and the anti-loosening pad 105. After the conical surface of the drive shaft 1 and the tapered hole of the impeller 2 are matched, they can further fix the two.

[0044] The deflector 4 is arranged outside the transition shaft core 101 and is fixed to the supporting body 202 of the impeller 2 through the pins 5 .

[0045] Furthermore, as a preference, O-rings 9 are provided at the contact points between the sleeve 3 , the raised ring 103 and the support body 202 .

[0046] A method for manufacturing a closed impeller rotor sleeve comprises the following steps:

[0047] (1) Transmission shaft processing: First, the transmission shaft material is tested by ultrasonic flaw detector. After the flaw detection is qualified, heat treatment, rough turning, semi-finishing turning, and fine grinding are carried out to produce the matching tapered shaft core. After the processing is completed, penetrant flaw detection is carried out for standby use;

[0048] (2) Impeller rough machining: CNC vertical lathe is used to machine a matching tapered hole inside the impeller support body. During the machining process, a detection mandrel is used to detect the taper of the matching tapered hole. The fit between the matching tapered hole and the detection mandrel is greater than 80%;

[0049] (3) The impeller is finely processed. The matching tapered hole is manually ground using a grinding tool with a taper consistent with the taper of the detection mandrel. After grinding, the inner surface of the matching tapered hole is protected. The diameter of the impeller is relatively large, about 1630 mm. When processing large-diameter impellers, the speed of the CNC vertical lathe cannot be too fast and there will be certain limitations. Therefore, if only CNC vertical lathe turning is used, the roughness of the tapered hole is difficult to meet the design requirements. Therefore, it is necessary to combine manual grinding and the fit between the cone surface and the tapered hole needs to be tested again after grinding.

[0050] (4) Impeller counterweight: perform double-sided dynamic balancing on the impeller with an accuracy requirement of G1;

[0051] (5) Taper grinding: The large diameter of the impeller's matching tapered hole is facing upwards, a non-metallic tray is placed on the large diameter, and the level is aligned with a spirit level. The drive shaft is placed on a cylindrical grinder, and the angle is adjusted to grind the outer conical surface. During the grinding process, the angle is continuously adjusted to fit the angle of the matching tapered hole.

[0052] (6) After the transmission shaft is balanced and ground, the transmission shaft is dynamically balanced on both sides with an accuracy requirement of G1;

[0053] (7) Assembly: After the dynamic balancing of the transmission shaft is completed, the structure of claim 6 is assembled to form a closed impeller rotor housing.

[0054] Furthermore, as a preference, the grinding tooling used in the impeller fine machining in step (3) is provided with a grinding sand storage tank 10 , and the sand and gravel produced during grinding are stored in the grinding sand storage tank 10 .

[0055] Furthermore, as a preference, during the assembly of step (7), the impeller and the transmission shaft are aligned and then the impeller is slowly pushed so that the matching tapered hole of the impeller is sleeved onto the matching tapered surface core of the transmission shaft. After the installation is completed, the double-sided dynamic balancing of the rotor sleeve assembly is performed with an accuracy requirement of G1.

[0056] Multiple dynamic balancing can improve the overall manufacturing accuracy of the closed impeller rotor sleeve.

[0057] Example 2:

[0058] In Example 1, the connection between the transmission shaft 1 and the impeller 2 generates a lot of heat during long-term operation. The workpieces expand under the action of heat, and the thermal expansion causes a certain amount of wear between the workpieces, thereby affecting the service life of the equipment. As a preferred embodiment, see Figure 1 、 Figure 3 、 Figure 4 The outer wall of the mating tapered shaft core 102 is further provided with a plurality of inclined slots 107. The provision of the inclined slots 107 can buffer the heat generated during the operation of the mating tapered shaft core 102 and the mating tapered hole 203, thereby releasing the heat to a certain extent;

[0059] Furthermore, as a preference, a first fitting gap 6 is left between the end surface of the transition shaft core 101 and the support body 202 .

[0060] Furthermore, preferably, a second fitting gap 7 is left between the end surface of the raised ring 103 and the shaft sleeve 3 .

[0061] Furthermore, as a preference, a third fitting gap 8 is left between the end of the fitting conical surface shaft core 102 and the inner wall of the fitting conical hole 203 .

[0062] The provision of multiple gaps can further buffer the thermal expansion problem caused by the long-term operation of the transmission shaft 1 and the impeller 2, thereby reducing the problem of wear between the workpieces and extending the service life of the equipment.

[0063] During operation, the closed impeller rotor sleeve works as a whole. The transmission shaft 1 is installed in the bearing seat, the bearing seat is connected to the coupling, the coupling is connected to the motor, and the motor drives the transmission shaft 1 to rotate, thereby causing the impeller rotor sleeve to rotate as a whole.

[0064] The overall structure of the present invention is more stably assembled, can reduce the problem of workpiece wear caused by thermal expansion, and extend the service life of the equipment; and the manufactured closed impeller rotor sleeve has higher precision.

[0065] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A closed impeller rotor housing, characterized in that: It comprises a transmission shaft (1), an impeller (2), a shaft sleeve (3) and a guide cover (4); The transmission shaft (1) is provided with a transition shaft core (101) and a matching conical shaft core (102); the impeller (2) is composed of an impeller housing (201) and a supporting body (202) therein; a matching conical hole (203) is provided in the supporting body (202); and the matching conical shaft core (102) is embedded in the matching conical hole (203); The transition shaft core (101) is provided with a raised ring (103), the shaft sleeve (3) is sleeved on the transition shaft core (101), and one end of the shaft sleeve (3) presses the support body (202) of the impeller (2), and the other end is sleeved on the raised ring (103), and the interior of the shaft sleeve (3) is fixed to the transition shaft core (101) by a pin (5); The shaft sleeve (3) is also provided with a shaft sleeve chuck (301), which clamps the shaft sleeve (3) and the support body (202) of the impeller (2), and the shaft sleeve chuck (301) is also provided with a shaft sleeve locking bolt (302); The end of the matching conical surface shaft core (102) is also covered with a locking pad (104) and an anti-loosening pad (105), the outer walls of the locking pad (104) and the anti-loosening pad (105) are respectively clamped with the inner wall of the matching tapered hole (203), and a locking nut (106) is screwed on the outside of the anti-loosening pad (105), and the locking nut (106) presses the locking pad (104) and the anti-loosening pad (105); The deflector cover (4) is arranged outside the transition shaft core (101) and is fixed to the support body (202) of the impeller (2) via a pin (5); A first fitting gap (6) is left between the end surface of the transition shaft core (101) and the supporting body (202); A second fitting gap (7) is left between the end surface of the raised ring (103) and the shaft sleeve (3); A third fitting gap (8) is left between the end of the fitting conical surface shaft core (102) and the inner wall of the fitting conical hole (203).

2. The closed impeller rotor cover according to claim 1, characterized in that: A plurality of inclined slots (107) are also provided on the outer wall of the matching conical surface shaft core (102).

3. The closed impeller rotor cover according to claim 1, characterized in that: O-type sealing rings (9) are provided at the contact points between the shaft sleeve (3), the raised ring (103) and the supporting body (202).

4. A method for manufacturing a closed impeller rotor cover according to claim 3, characterized in that: The following steps are involved: (1) Transmission shaft processing: First, the transmission shaft material is tested by ultrasonic flaw detector. After the flaw detection is qualified, heat treatment, rough turning, semi-finishing turning, and fine grinding are carried out to produce the matching tapered shaft core. After the processing is completed, penetrant flaw detection is carried out for standby use; (2) Impeller rough machining: CNC vertical lathe is used to machine a matching tapered hole inside the impeller support body. During the machining process, a detection mandrel is used to detect the taper of the matching tapered hole. The fit between the matching tapered hole and the detection mandrel is greater than 80%; (3) Impeller finishing: Use a grinding tool with a taper consistent with the taper of the detection mandrel to manually grind the matching tapered hole. After grinding, protect the inner surface of the matching tapered hole; (4) Impeller counterweight: perform double-sided dynamic balancing on the impeller with an accuracy requirement of G1; (5) Taper grinding: The large diameter of the impeller's matching tapered hole is facing upwards, a non-metallic tray is placed on the large diameter, and the level is aligned with a spirit level. The drive shaft is placed on a cylindrical grinder, and the angle is adjusted to grind the outer conical surface. During the grinding process, the angle is continuously adjusted to fit the angle of the matching tapered hole. (6) After the transmission shaft is balanced and ground, the transmission shaft is dynamically balanced on both sides with an accuracy requirement of G1; (7) Assembly: After the dynamic balancing of the transmission shaft is completed, the structure of claim 3 is assembled to form a closed impeller rotor housing.

5. The method for manufacturing a closed impeller rotor cover according to claim 4, characterized in that: The grinding tool used in the impeller fine processing in step (3) is provided with a grinding sand storage tank (10), and the sand and gravel generated during the grinding are stored in the grinding sand storage tank (10).

6. The method for manufacturing a closed impeller rotor cover according to claim 4, characterized in that: During the assembly of step (7), the impeller and the transmission shaft are aligned and the impeller is slowly pushed so that the matching tapered hole of the impeller is fitted onto the matching tapered surface of the transmission shaft. After the installation is completed, the rotor sleeve assembly is subjected to double-sided dynamic balancing with an accuracy requirement of G1.

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