Compressor crankshaft rotor press-in device and working method

Abstract

The invention provides a compressor crankshaft rotor press-in device and a working method, relates to the field of compressor tools, and aims to solve the problems that press fitting is inconvenient and damage is easily caused during press fitting due to blocking of fan blades of a main shaft and an auxiliary shaft of a first-order crank throw crankshaft at present. The coaxiality of the crankshaft and the rotor is ensured; the springs are arranged to provide buffering, and rigid impact and crushing of the parts are avoided; the supporting plate of the pressure bearing mechanism provides counter force for the crankshaft, the avoiding part solves the problem of blocking of the fan blades, press fitting can be smoothly carried out, the crankshaft cannot be damaged, the press fitting device is suitable for press fitting of the first-order crank throw crankshaft and the rotor, and the production efficiency and the product percent of pass are improved.

Description

Technical Field

[0001] The present invention relates to the field of compressor tooling, and specifically relates to a compressor crankshaft rotor pressing device and a working method thereof. Background Art

[0002] A compressor is a key component of a refrigeration system. Its moving mechanism drives the crankshaft to rotate through an electric motor, which is converted into the reciprocating motion of the piston. With the cooperation of the suction and discharge valves, the refrigerant is inhaled, compressed, and transported. In the compressor assembly process, fixing the rotor to the core crankshaft is a very important process. The runout and axial clearance of the core rotor are directly related to the efficiency, noise level, and service life of the compressor. Currently, the rotor is usually fixed to the first-order crankshaft by the hot sleeve process. The hot sleeve process requires precise control of temperature and time to ensure that the rotor and the crankshaft can be closely fitted, which increases the complexity and cost of the process. And when the hot sleeve of the rotor is unstable, it will cause the center of mass of the rotor to deviate from the center of rotation, generating an unbalanced force, thus causing problems such as vibration and noise.

[0003] When using the cold pressing process, that is, directly placing the rotor in the sleeve and using hydraulic equipment to directly press it in, the workpiece to be pressed and the tooling are in rigid contact, without a buffering effect during the pressing process, and it is easy to damage the rotor and the crankshaft; Chinese Patent (Publication No. CN 116690165A, Publication Date: September 5, 2023) discloses a device for installing a scroll compressor crankshaft rotor assembly into the compressor. The lifting shaft is used to carry the rotor. After the lifting shaft contacts the rotor, the lifting shaft slowly descends, and then the stator slowly descends, avoiding damage to the parts caused by the direct fall of the rotor and hitting the lower support; and a shim is used as a guiding device. The shim can enter the stator to center and guide the crankshaft rotor assembly, making the crankshaft rotor assembly coaxial with the stator; however, what it realizes is the cooperation between the already assembled crankshaft rotor assembly and the pump housing assembly, which is not suitable for the press-fitting of the first-order crankshaft and the rotor. When the first-order crankshaft and the rotor are fitted, due to the obstruction of the fan blades of the main shaft and the auxiliary shaft of the first-order crankshaft, it is inconvenient to apply force during the press-fitting. If force is directly applied to the fan blade of the auxiliary shaft, it is easy to cause bending deformation damage to the eccentric shaft position where the main shaft and the auxiliary shaft are connected; in addition, using a shim for guiding is only applicable to the form with a gap between the stator and the crankshaft rotor assembly, and is not applicable to the interference fit method after the press-fitting between the first-order crankshaft and the rotor. Adding a shim for guiding will cause the first-order crankshaft and the rotor to be unable to fit, and it is also easy to cause damage due to the addition of the shim. Summary of the Invention

[0004] The object of the present invention is to provide a compressor crankshaft rotor pressing device and working method in view of the defects existing in the prior art. The guide rod cooperates with the oil suction hole at the end of the crankshaft to achieve precise positioning and ensure the coaxiality of the crankshaft and the rotor. The spring provides buffering to avoid damaging parts due to rigid impact. The support plate of the bearing mechanism provides a reaction force for the crankshaft, and the avoidance part solves the problem of fan blade blockage, enabling smooth pressing without damaging the crankshaft. It is applicable to the pressing of first-order crankshafts and rotors, improving production efficiency and product qualification rate.

[0005] The first object of the present invention is to provide a compressor crankshaft rotor pressing device, which adopts the following scheme:

[0006] Including:

[0007] A guiding and positioning assembly, including a guide rod, a guide seat, and a support base. One end of the guide rod extends into a preset sliding hole in the guide seat and is slidably matched with the sliding hole, and the other end is provided with a positioning stepped portion for extending into the oil suction hole at the end of the crankshaft. An annular bearing surface is formed at the end of the guide seat and is distributed around the guide rod. A spring that expands and contracts along the sliding direction of the guide rod abuts against the guide rod. The guide rod changes its axial length in the sliding hole under the action of an external force and the spring. The guide seat is installed on a lifting driving member through the support base;

[0008] A bearing mechanism, suspended above the guide rod. The bearing mechanism is provided with a support plate for contacting the fan surface of the main shaft of the crankshaft to provide a reaction force for the crankshaft. An avoidance portion for accommodating the fan of the secondary shaft of the crankshaft is provided between the support plate and the main body of the bearing mechanism.

[0009] Further, the positioning stepped portion includes two segments with different diameters. The first segment with a smaller diameter is located at the top end of the guide rod, and the second segment with a larger diameter is matched with the sliding hole. A tapered section is provided at the end of the first segment.

[0010] Further, guide grooves are provided in the sliding hole of the guide seat and are distributed parallel to the sliding direction of the guide rod. Guide blocks are provided on the guide rod and are matched with the guide grooves to restrict the rotation between the guide rod and the sliding hole.

[0011] Further, one end of the guide rod located in the sliding hole abuts against one end of the spring. The spring is located in the guide seat, and the end of the spring away from the guide rod is fixed on the guide seat.

[0012] Further, the guide rod, the sliding hole, and the spring are coaxially distributed, and the axis distribution direction is parallel to the pressing direction of the crankshaft cooperating with the rotor.

[0013] Further, the support plate is provided with a notch for positioning in cooperation with the eccentric shaft of the crankshaft.

[0014] Further, one side of the support plate contacts and fits the fan surface of the main shaft of the crankshaft, and a reinforcing rib is provided between the other side and the main body of the bearing mechanism.

[0015] Furthermore, it further includes a reaction frame, and the lifting driving member and the pressure-bearing mechanism are respectively installed on the reaction frame.

[0016] Furthermore, the support base is detachably connected to the lifting driving member, and the pressure-bearing mechanism is detachably connected to the reaction frame.

[0017] The second object of the present invention is to provide a working method of a compressor crankshaft rotor pressing device, including:

[0018] The rotor to be pressed is sleeved outside the guide rod, and the bottom end of the rotor abuts against the annular bearing surface for stable placement; one end of the crankshaft is inserted into the central through hole of the rotor, and the oil suction hole at the end of the crankshaft cooperates with the positioning step portion;

[0019] The lifting driving member drives the crankshaft and the rotor to move upward, adjusts the position of the crankshaft, so that the fan blades of the crankshaft secondary shaft pass over the support plate and are in the avoidance portion, and the support plate abuts against the fan blade surface of the crankshaft main shaft;

[0020] As the lifting driving surface drives the rotor to continue to rise, the position of the crankshaft is restricted by the support plate and no longer rises, an axial position change is formed between the crankshaft and the rotor, the guide rod keeps the crankshaft and the rotor coaxial, and the crankshaft pushes the guide rod to gradually retract into the sliding hole, and the spring is compressed;

[0021] After the rotor and the crankshaft are completed with the press-fitting, the lifting driving member descends, the crankshaft and the rotor are fixed, the guide rod gradually returns to its original state under the elastic rebound of the spring, the pressed crankshaft and rotor are taken off, and the next rotor and crankshaft are pressed.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] Aiming at the problems that it is inconvenient to press-fit due to the obstruction of the fan blades of the first-order crankshaft main shaft and secondary shaft and it is easy to cause damage during press-fitting, the guide rod cooperates with the oil suction hole at the end of the crankshaft to achieve precise positioning and ensure the coaxiality of the crankshaft and the rotor; the setting of the spring provides buffering to avoid damaging the parts due to rigid impact; the support plate of the pressure-bearing mechanism provides a reaction force for the crankshaft, and the avoidance portion solves the problem of fan blade obstruction, enabling the press-fitting to proceed smoothly and not causing damage to the crankshaft, being applicable to the press-fitting of the first-order crankshaft and the rotor, and improving the production efficiency and product qualification rate.

[0024] The positioning step portion is composed of two segments with different diameters. The first segment with a smaller diameter is located at the top of the guide rod and can accurately insert into the oil suction hole at the end of the crankshaft. It is easier to align during insertion and is not easily hindered by factors such as irregular hole walls. The second segment with a larger diameter cooperates with the sliding hole to provide stable support for the sliding of the guide rod in the sliding hole, ensuring that the guide rod does not shake in the sliding hole and guaranteeing the positioning accuracy. The conical segment at the end of the first segment plays a guiding role when inserting into the crankshaft oil suction hole, making it easier for the guide rod to enter the hole, reducing the deviation during the insertion process, and ensuring that the crankshaft and the rotor are in an accurate coaxial position before press-fitting.

[0025] The rotational constraint is formed by the cooperation of the guide groove and the guide block. The guide rod can only slide axially along the sliding hole, ensuring that during press-fitting, the guide rod can always accurately guide the relative position of the crankshaft and the rotor, making the press-fitting force act evenly between the two, avoiding local stress concentration caused by position deviation, preventing part damage, and improving the press-fitting quality.

[0026] During the press-fitting process, when the crankshaft pushes the guide rod to retract, the spring is compressed, absorbing the impact force during the press-fitting process and avoiding damage to the parts caused by rigid contact. The guide rod, the sliding hole, and the spring are coaxially distributed. The guide rod can accurately guide the relative movement of the crankshaft and the rotor, and the buffering force of the spring can also act evenly on the guide rod and then evenly act between the crankshaft and the rotor. Brief Description of the Drawings

[0027] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0028] Figure 1 It is a schematic structural diagram of the compressor crankshaft rotor press-fitting device in one or more embodiments of the present invention.

[0029] Figure 2 It is an exploded structural diagram of the guide positioning assembly in one or more embodiments of the present invention.

[0030] Figure 3 It is a schematic diagram of the guide positioning assembly in one or more embodiments of the present invention.

[0031] Figure 4 It is a schematic diagram of the pressure-bearing mechanism in one or more embodiments of the present invention.

[0032] Figure 5 It is a schematic diagram of the guide positioning assembly and the pressure-bearing mechanism cooperating with the crankshaft and the rotor in one or more embodiments of the present invention.

[0033] Figure 6 It is a schematic diagram of the compressor crankshaft rotor press-fitting device during operation in one or more embodiments of the present invention.

[0034] Among them, 1. Pressure-bearing mechanism; 2. Guiding and positioning component; 3. Lifting driving part; 4. Reaction frame; 5. Guide rod; 6. Spring; 7. Guide seat; 8. Support base; 9. Ring-shaped bearing surface; 10. First section; 11. Support plate; 12. Notch; 13. Reinforcing rib; 14. Rotor; 15. Crankshaft; 16. Movement mechanism. Specific implementation manner

[0035] Embodiment 1

[0036] In a typical embodiment of the present invention, as Figures 1-6 shown, a compressor crankshaft rotor press-fitting device is provided.

[0037] The cold pressing process installation uses rigid contact without buffering, and it is easy to damage the rotor 14 and the crankshaft 15. Although the existing installation devices have certain improvements in the cooperation between the assembled crankshaft 15 rotor 14 assembly and the pump housing assembly, they are not applicable to the press-fitting of the first-order crankshaft 15 and the rotor 14. Due to the obstruction of the fan blades of the main shaft and the sub-shaft of the first-order crankshaft 15, it is inconvenient to apply force during press-fitting. Directly applying force to the fan blades of the sub-shaft easily causes bending deformation and damage to the eccentric shaft position where the main shaft and the sub-shaft are connected. Moreover, the plug piece guiding used by it is not applicable to the interference fit method after press-fitting between the first-order crankshaft 15 and the rotor 14. Increasing the plug piece guiding will cause the two to be unable to cooperate and easily cause damage. Based on this, this embodiment provides a compressor crankshaft rotor press-fitting device. The guide rod 5 cooperates with the oil suction hole at the end of the crankshaft 15 to achieve precise positioning and ensure the coaxiality of the crankshaft 15 and the rotor 14. The setting of the spring 6 provides buffering to avoid damaging parts due to rigid impact. The support plate 11 of the pressure-bearing mechanism 1 provides a reaction force for the crankshaft 15, and the avoidance part solves the problem of fan blade obstruction, enabling the press-fitting to proceed smoothly without damaging the crankshaft 15. It is applicable to the press-fitting of the first-order crankshaft 15 and the rotor 14, improving the production efficiency and the product qualification rate.

[0038] As Figures 1-6 shown, the compressor crankshaft rotor press-fitting device mainly includes a guiding and positioning component 2, a pressure-bearing mechanism 1 and a reaction frame 4. The positioning and guiding component and the pressure-bearing mechanism 1 are respectively installed on the reaction frame 4. The pre-assembled rotor 14 and crankshaft 15 are carried by the positioning and guiding component and pushed towards the pressure-bearing mechanism 1. Press-fitting is achieved under the constraint of the pressure-bearing mechanism 1 to move the crankshaft 15. The crankshaft 15 in this embodiment is a first-order crankshaft 15.

[0039] Among them, the guiding and positioning component 2 is composed of a guiding rod 5, a guiding seat 7 and a supporting base 8. The guiding seat 7 is provided with a sliding hole whose axis is parallel to the pressing direction. The sliding hole serves as a guiding hole for the movement of the guiding rod 5. One end of the guiding rod 5 extends into the sliding hole and can slide in the sliding hole to establish a sliding fit. The other end of the guiding rod 5 is provided with a positioning step portion, which can be inserted into the oil suction hole at the end of the crankshaft 15, and the centering and positioning between the guiding rod 5 and the crankshaft 15 are realized through the shaft hole fit. The end of the guiding seat 7 has an annular bearing surface 9 surrounding the guiding rod 5. When the rotor 14 is sleeved outside the guiding rod 5, the rotor 14 and the guiding rod 5 form a coaxial state. Combining the positioning of the positioning step portion and the crankshaft 15, a coaxial state is formed among the rotor 14, the guiding rod 5 and the crankshaft 15, meeting the coaxiality requirement during pressing. The guiding rod 5 abuts against a spring 6 that expands and contracts along its sliding direction, and the spring 6 provides buffering and reset functions.

[0040] The guiding seat 7 is installed on the lifting driving member 3 through the supporting base 8. The lifting driving member 3 drives the entire guiding and positioning component 2 and the carried crankshaft 15 and rotor 14 to perform lifting movements, meeting the pressing action requirements. The lifting driving member 3 can adopt an electric cylinder, a hydraulic cylinder, etc., and can control the driving speed and lifting distance of the lifting driving member 3 for the guiding and positioning component 2 as required.

[0041] The pressure-bearing mechanism 1 is suspended above the guiding rod 5. The main body of the pressure-bearing mechanism 1 is provided with a supporting plate 11 for contacting the main shaft fan blade surface of the crankshaft 15 to provide a reaction force for the crankshaft 15. An avoidance portion for accommodating the auxiliary shaft fan blade of the crankshaft 15 is provided between the supporting plate 11 and the main body of the pressure-bearing mechanism 1.

[0042] During use, the rotor 14 to be pressed is sleeved outside the guiding rod 5, and the bottom end of the rotor 14 is stably placed against the annular bearing surface 9; one end of the crankshaft 15 is inserted into the central through hole of the rotor 14, and the oil suction hole at the end of the crankshaft 15 is matched with the positioning step portion; the lifting driving member 3 drives the crankshaft 15 and the rotor 14 to move upward, adjusts the position of the crankshaft 15 so that the auxiliary shaft fan blade of the crankshaft 15 crosses over the supporting plate 11 and enters the avoidance portion, and the supporting plate 11 abuts against the main shaft fan blade surface of the crankshaft 15; as the rotor 14 continues to rise, the crankshaft 15 is restricted by the supporting plate 11 and no longer rises, and the axial position of the crankshaft 15 and the rotor 14 changes. The guiding rod 5 ensures the coaxiality of the two. The crankshaft 15 pushes the guiding rod 5 to retract, and the spring 6 is compressed; after the pressing of the rotor 14 and the crankshaft 15 is completed, the lifting driving member 3 descends, the crankshaft 15 and the rotor 14 are fixed, the guiding rod 5 returns to its original state under the rebound of the spring 6, and the pressed component is removed to perform the pressing of the next component.

[0043] The guiding and positioning component 2 and the pressure-bearing mechanism 1 solve the problems of inconvenient force application due to the obstruction of the fan blades and easy damage to parts caused by rigid contact during the pressing of the first-order crankshaft 15 and the rotor 14. The cooperation between the guiding rod 5 and the oil suction hole at the end of the crankshaft 15 realizes precise positioning, ensures the coaxiality of the crankshaft 15 and the rotor 14, and improves the production efficiency and product qualification rate.

[0044] As shown in Figure 2 and Figure 3 the positioning stepped portion includes two segments with different diameters. The first segment 10 with a smaller diameter is located at the top end of the guide rod 5, and the second segment with a larger diameter fits into the sliding hole. A tapered section is provided at the end of the first segment 10.

[0045] Specifically, the positioning stepped portion is composed of two segments with different diameters. The first segment 10 with a smaller diameter is located at the top end of the guide rod 5 and can be accurately inserted into the oil suction hole at the end of the crankshaft 15. Due to its small diameter, it is easier to align during insertion and is not easily hindered by factors such as irregular hole walls. The second segment with a larger diameter fits with the sliding hole, providing stable support for the sliding of the guide rod 5 in the sliding hole, ensuring that the guide rod 5 does not shake in the sliding hole and guaranteeing the positioning accuracy. At the same time, the second segment can position the rotor 14, keeping the rotor 14 coaxial with the guide rod 5.

[0046] The tapered section at the end of the first segment 10 plays a guiding role when inserting into the oil suction hole of the crankshaft 15, making it easier for the guide rod 5 to enter the hole, reducing the deviation during the insertion process, further improving the positioning accuracy, ensuring that the crankshaft 15 and the rotor 14 are in an accurate coaxial position before press-fitting, and laying a foundation for the subsequent smooth press-fitting.

[0047] As shown in Figure 2 and Figure 3 the guiding grooves distributed in the sliding hole of the guide seat 7 parallel to the sliding direction of the guide rod 5 cooperate with the corresponding guiding blocks on the guide rod 5, effectively restricting the rotation between the guide rod 5 and the sliding hole. During the press-fitting process, if the guide rod 5 rotates, it will cause the relative positions of the crankshaft 15 and the rotor 14 to shift, and the coaxiality between the two cannot be guaranteed. In this embodiment, through the sliding cooperation of the guiding grooves and the guiding blocks, the guide rod 5 can only slide axially along the sliding hole, ensuring that during press-fitting, the guide rod 5 can always accurately guide the relative positions of the crankshaft 15 and the rotor 14, making the press-fitting force act evenly between the crankshaft 15 and the rotor 14, avoiding local stress concentration caused by position deviation, preventing part damage, and improving the press-fitting quality.

[0048] As shown in Figure 2 and Figure 3 one end of the guide rod 5 located inside the sliding hole abuts against one end of the spring 6. The spring 6 is located inside the guide seat 7, and the end far from the guide rod 5 is fixed on the guide seat 7. This ensures that the spring 6 can stably provide a buffering force for the guide rod 5. During the press-fitting process, when the crankshaft 15 pushes the guide rod 5 to retract, the spring 6 is compressed, absorbing the impact force during the press-fitting process and avoiding damage to the parts caused by rigid contact. At the same time, since the spring 6 is fixed on the guide seat 7, its compression and rebound processes are stable and will not affect the buffering effect due to position movement, ensuring the smoothness and reliability of the entire press-fitting process.

[0049] As Figure 5 , Figure 6 shown, the guide rod 5, the sliding hole and the spring 6 are coaxially distributed, and the axis direction is parallel to the pressing direction of the crankshaft 15 mating with the rotor 14, ensuring that during the pressing process, the force transmission path is straight and stable. The guide rod 5 can accurately guide the relative movement of the crankshaft 15 and the rotor 14, and the buffering force of the spring 6 can also act evenly on the guide rod 5, and then act evenly between the crankshaft 15 and the rotor 14. If the components are not coaxial, it will cause uneven force transmission, and problems such as tilting of the guide rod 5 and uneven force on the spring 6 may occur, affecting the pressing effect and even damaging the parts. The coaxial distribution design improves the stability and pressing accuracy of the entire device.

[0050] As Figure 4 shown, the notch 12 on the support plate 11 for positioning in cooperation with the eccentric shaft of the crankshaft 15 further improves the positioning accuracy of the crankshaft 15. During the pressing process, not only the oil suction hole at the end of the crankshaft 15 is positioned by the guide rod 5, but the notch 12 on the support plate 11 can also cooperate with the eccentric shaft of the crankshaft 15 to constrain the crankshaft 15 from another position, ensuring that the crankshaft 15 does not shift during the pressing process. It can ensure the coaxiality of the crankshaft 15 and the rotor 14 and the pressing quality. Especially for the pressing of the compressor crankshaft 15 and rotor 14 with high requirements for the position accuracy of the eccentric shaft, auxiliary positioning and displacement constraint can be realized through the notch 12, which can effectively improve the performance and reliability of the product.

[0051] One side of the support plate 11 contacts and fits the main shaft fan surface of the crankshaft 15, and there is a reinforcing rib 13 between the other side and the main body of the pressure-bearing mechanism 1. The setting of the reinforcing rib 13 enhances the strength and rigidity of the support plate 11. During the pressing process, the support plate 11 needs to bear the large pressure transmitted from the main shaft fan surface of the crankshaft 15. If the strength of the support plate 11 is insufficient, it may deform, affecting the support and reaction force on the crankshaft 15. The reinforcing rib 13 in this embodiment can disperse the pressure, improve the bearing capacity of the support plate 11, ensure that the support plate 11 can always stably provide a reaction force for the crankshaft 15 during the pressing process, ensure the smooth progress of the pressing process, and at the same time extend the service life of the support plate 11 and reduce the equipment maintenance cost.

[0052] As Figure 1 and Figure 6As shown, the lifting drive member 3 and the pressure-bearing mechanism 1 are respectively installed on the reaction frame 4. The reaction frame 4 provides a stable installation foundation for the lifting drive member 3 and the pressure-bearing mechanism 1. During the press-fitting process, the driving force generated by the lifting drive member 3 and the reaction force borne by the pressure-bearing mechanism 1 are balanced and transmitted through the reaction frame 4. The reaction frame 4 can disperse these forces to the support structure of the entire device, avoiding equipment damage caused by excessive local stress. At the same time, the presence of the reaction frame 4 makes the structure of the entire device more compact and stable, which is beneficial to improving the overall performance and working efficiency of the equipment.

[0053] The support base 8 is detachably connected to the lifting drive member 3, and the pressure-bearing mechanism 1 is detachably connected to the reaction frame 4. The detachable connection facilitates the maintenance, repair, and component replacement of the equipment. In this embodiment, the pressure-bearing mechanism 1 and the reaction frame 4 are fitted with studs and threaded holes, and the support base 8 and the lifting drive member 3 can also be connected by studs and threaded holes.

[0054] When a certain component among the support base 8, the lifting drive member 3, the pressure-bearing mechanism 1, or the reaction frame 4 fails or wears out, it can be easily disassembled for repair or replacement. Different specifications of the guiding and positioning component 2 and the pressure-bearing mechanism 1 can also be replaced according to requirements to adapt to different specifications of the compressor crankshaft 15 and the rotor 14, without the need for large-scale disassembly of the entire equipment. This not only shortens the equipment downtime, improves production efficiency, but also reduces the equipment maintenance cost and enhances the maintainability and service life of the equipment.

[0055] Embodiment 2

[0056] In another typical embodiment of the present invention, as Figures 1-6 shown, a working method of the compressor crankshaft and rotor press-fitting device is given.

[0057] The working method of the compressor crankshaft and rotor press-fitting device utilizes the compressor crankshaft and rotor press-fitting device in Embodiment 1, and specifically includes the following steps:

[0058] The rotor 14 to be press-fitted is sleeved outside the guide rod 5, and the bottom end of the rotor 14 abuts against the annular bearing surface 9 for stable placement; one end of the crankshaft 15 is inserted into the central through hole of the rotor 14, and the oil suction hole at the end of the crankshaft 15 is engaged with the positioning step portion;

[0059] The lifting drive member 3 drives the crankshaft 15 and the rotor 14 to move upward, adjusts the position of the crankshaft 15, so that the sub-shaft fan blade of the crankshaft 15 is in the avoidance portion after passing over the support plate 11, and the support plate 11 abuts against the main-shaft fan blade surface of the crankshaft 15;

[0060] As the lifting drive surface drives the rotor 14 to continue rising, the position of the crankshaft 15 is restricted by the support plate 11 and no longer rises. An axial position change is formed between the crankshaft 15 and the rotor 14. The guide rod 5 keeps the crankshaft 15 and the rotor 14 coaxial. The crankshaft 15 pushes the guide rod 5 to gradually retract into the sliding hole, and the spring 6 is compressed;

[0061] After the rotor 14 and the crankshaft 15 are press-fitted, the lifting drive member 3 descends, the crankshaft 15 and the rotor 14 are fixed, the guide rod 5 gradually returns to its original state under the elastic rebound of the spring 6, and the press-fitted crankshaft 15 and rotor 14 are removed, and the next rotor 14 and crankshaft 15 are press-fitted.

[0062] Specifically, in combination with Figures 1-6 , the working method will be described in detail.

[0063] The rotor 14 to be press-fitted is sleeved outside the guide rod 5. At this time, the bottom end of the rotor 14 will abut against the annular bearing surface 9 at the end of the guide seat 7, so as to achieve stable placement. Then, one end of the crankshaft 15 is inserted into the central through hole of the rotor 14, and the oil suction hole at the end of the crankshaft 15 is closely fitted with the positioning step portion on the guide rod 5. It can be understood that the movement mechanism 16 can also be pre-assembled on the crankshaft 15 first, and then the crankshaft 15 is installed to be pre-fitted with the guide rod 5 and the rotor 14.

[0064] The rotor 14 outside the guide rod 5 is placed on the annular bearing surface 9, ensuring the stability of the rotor 14 in the initial stage and preventing it from shaking or displacing during subsequent operations. The cooperation between the oil suction hole at the end of the crankshaft 15 and the positioning step portion provides precise positioning for the relative position of the crankshaft 15 and the rotor 14. Through this positioning method, it can be ensured that the crankshaft 15 and the rotor 14 are in an accurate coaxial state before the press-fitting starts.

[0065] Start the lifting drive member 3 to drive the crankshaft 15 and the rotor 14 to move upward together. During this process, the position of the crankshaft 15 needs to be adjusted so that the fan blade of the secondary shaft of the crankshaft 15 can smoothly cross the support plate 11 and finally be in the avoidance portion between the support plate 11 and the main body of the pressure-bearing mechanism 1. At this time, the support plate 11 just abuts against the fan blade surface of the main shaft of the crankshaft 15.

[0066] The lifting drive member 3 drives the crankshaft 15 and the rotor 14 to move upward, creating conditions for subsequent press-fitting operations. Allowing the fan blade of the secondary shaft of the crankshaft 15 to cross the support plate 11 and enter the avoidance portion is to prevent interference between the fan blade of the secondary shaft and the support plate 11 during the press-fitting process, ensuring that the press-fitting force can be smoothly transmitted to the crankshaft 15 and the rotor 14. The support plate 11 abuts against the fan blade surface of the main shaft of the crankshaft 15, providing a stable reaction force support point for the crankshaft 15. When the subsequent rotor 14 continues to rise, the crankshaft 15 can maintain its relative position unchanged under the constraint of the support plate 11, thereby realizing the axial position change between the crankshaft 15 and the rotor 14 and laying the foundation for the press-fitting process.

[0067] As the lifting drive surface continuously drives the rotor 14 to rise, since the position of the crankshaft 15 is restricted by the support plate 11 and no longer rises, an axial position change will form between the crankshaft 15 and the rotor 14 at this time. During this process, the guide rod 5 always keeps the crankshaft 15 and the rotor 14 coaxial. At the same time, the crankshaft 15 will push the guide rod 5 to gradually retract into the sliding hole, and the spring 6 abutted by the other end of the guide rod 5 is also compressed accordingly.

[0068] During the press-fitting process, the guide rod 5 plays a guiding role, ensuring that the crankshaft 15 and the rotor 14 always remain coaxial during the relative movement process, preventing press-fitting deviations and part damage caused by non-coaxiality. The compression of the spring 6 provides buffering for the entire press-fitting process. Since a large impact force will be generated during the press-fitting process, without buffering, rigid impact is likely to cause damage to the crankshaft 15 and the rotor 14. The spring 6 absorbs the impact force through its own compression deformation, making the press-fitting process smoother, improving the press-fitting quality, and at the same time extending the service life of the equipment and parts.

[0069] When the press-fitting of the rotor 14 and the crankshaft 15 is completed and the rotor 14 and the movement 16 reach the designed axial clearance value, the press-fitting operation of the rotor 14 is completed at this time, and the lifting drive member 3 is controlled to descend. At this time, the crankshaft 15 and the rotor 14 are already fixed to each other, and the guide rod 5 gradually returns to its initial state under the action of the spring 6 rebounding. Finally, the press-fitted crankshaft 15 and rotor 14 are removed from the device, and then the press-fitting operation for the next rotor 14 and crankshaft 15 can be started.

[0070] The descent of the lifting drive member 3 returns the entire device to its initial position, preparing for the next press-fitting. The guide rod 5 returns to its original state under the action of the spring 6 rebounding, ensuring the repeatable use of the device. Removing the press-fitted parts in a timely manner and performing the press-fitting of the next set of parts improves production efficiency and ensures that the press-fitting work can be carried out continuously and stably.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A compressor crankshaft rotor pressing device, characterized in that: include: The guide positioning assembly includes a guide rod, a guide seat and a support base. One end of the guide rod is inserted into a preset sliding hole of the guide seat and slidably cooperates with the sliding hole, and the other end is provided with a positioning step portion for inserting into the oil suction hole at the end of the crankshaft; an annular bearing surface distributed around the guide rod is formed at the end of the guide seat, and the guide rod is abutted against a spring that expands and contracts along its sliding direction. The guide rod changes its axial length in the sliding hole under the action of external force and the spring, and the guide seat is installed on the lifting drive member through the support base; The pressure-bearing mechanism is suspended above the guide rod. A support plate for contacting the crankshaft main shaft blade surface to provide reaction force for the crankshaft is provided on the pressure-bearing mechanism. An escape portion for accommodating the crankshaft secondary shaft blade is provided between the support plate and the pressure-bearing mechanism body.

2. The compressor crankshaft rotor pressing device according to claim 1, characterized in that: The positioning step portion includes two sections with different diameters. The first section with a smaller diameter is located at the top end of the guide rod, and the second section with a larger diameter cooperates with the sliding hole. The end of the first section is provided with a tapered section.

3. The compressor crankshaft rotor pressing device according to claim 2, characterized in that: A guide groove parallel to the sliding direction of the guide rod is arranged in the sliding hole of the guide seat, and a guide block matched with the guide groove is arranged on the guide rod to restrict the rotation between the guide rod and the sliding hole.

4. The compressor crankshaft rotor press-in device according to claim 2 or 3, characterized in that: One end of the guide rod located in the sliding hole abuts against one end of the spring, the spring is located in the guide seat, and one end of the spring away from the guide rod is fixed on the guide seat.

5. The compressor crankshaft rotor pressing device according to claim 4, characterized in that: The guide rod, the sliding hole and the spring are coaxially distributed, and the axial distribution direction is parallel to the press-fitting direction of the crankshaft and the rotor.

6. The compressor crankshaft rotor pressing device according to claim 1, characterized in that: The support plate is provided with a notch for positioning the eccentric shaft of the crankshaft.

7. The compressor crankshaft rotor pressing device according to claim 6, characterized in that: One side of the support plate contacts and fits the crankshaft main shaft fan blade surface, and a reinforcing rib is arranged between the other side and the pressure-bearing mechanism body.

8. The compressor crankshaft rotor pressing device according to claim 1, characterized in that: It also includes a reaction frame, and the lifting drive component and the pressure-bearing mechanism are respectively installed on the reaction frame.

9. The compressor crankshaft rotor pressing device according to claim 8, characterized in that: The support base is detachably connected to the lifting drive member, and the pressure-bearing mechanism is detachably connected to the reaction frame.

10. A method for operating a compressor crankshaft rotor pressing device, characterized in that: The compressor crankshaft rotor pressing device according to any one of claims 1 to 9 comprises: The rotor to be pressed is sleeved outside the guide rod, and the bottom end of the rotor abuts against the annular bearing surface to be placed stably; one end of the crankshaft is inserted into the central through hole of the rotor, and the oil suction hole at the end of the crankshaft cooperates with the positioning step; The lifting drive member drives the crankshaft and the rotor to move upward, and adjusts the position of the crankshaft so that the crankshaft secondary shaft blades are in the avoidance portion after passing over the support plate, and the support plate abuts against the crankshaft main shaft blade surface; As the lifting drive surface drives the rotor to continue to rise, the position of the crankshaft is constrained by the support plate and no longer rises, an axial position change occurs between the crankshaft and the rotor, the guide rod keeps the crankshaft and the rotor coaxial, the crankshaft pushes the guide rod to gradually retract into the slide hole, and the spring is compressed; After the rotor and crankshaft are press-fitted, the lifting drive member descends, the crankshaft and rotor are fixed, and the guide rod gradually returns to its original state under the rebound action of the spring. The press-fitted crankshaft and rotor are removed, and the next rotor and crankshaft are press-fitted.

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