Crankshaft assembly, assembling method thereof, compressor and air conditioner

Abstract

The invention provides a crankshaft assembly and an assembling method thereof, a compressor and an air conditioner, the crankshaft assembly comprises a crankshaft, a spiral oil guide piece and an oil suction pipe, the crankshaft is provided with a central oil hole at least penetrating to one axial end of the crankshaft, and the spiral oil guide piece comprises an external section, an interference fixing section and an internal section which are continuously arranged in the length direction of the spiral oil guide piece; on the axial projection of the spiral oil guide piece along the crankshaft, the outer diameters of the external section and the internal section are not larger than the aperture of the central oil hole, the outer diameter of the interference fixing section is larger than the diameter of the central oil hole so as to form interference fit with the inner wall of the central oil hole, a matching section of an oil suction pipe is formed in a hole opening in one end of the central oil hole, and the external section is located in the oil suction pipe. The phenomenon that the spiral oil guide piece is difficult to install or low in oil pumping efficiency due to the fact that the magnitude of interference between the spiral oil guide piece and the center oil hole is too large or too small can be eradicated, meanwhile, due to the fact that the sliding contact length of interference fit in the assembling process is remarkably shortened, scrap iron caused by long-time friction can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a crankshaft assembly and an assembling method thereof, a compressor, and an air conditioner. Background Art

[0002] Existing compressors, such as rotary compressors, have oil supply to the pump body through the central oil hole of the crankshaft and a spiral oil guide plate and an oil suction pipe installed in the central oil hole. When the compressor is running, the spiral oil guide plate can deliver the refrigeration oil in the oil pool to the oil outlet holes at various locations on the crankshaft through the central oil hole to meet the lubrication requirements between the various components of the compressor pump body.

[0003] Related technologies (such as Figure 1 and Figure 2 As shown in the figure, the fixation between the spiral oil guide plate and the crankshaft is mostly achieved by an interference fit between the head of the spiral oil guide plate (that is, the end away from the oil pool) and the bottom wall of the center oil hole. Since the center oil hole of the crankshaft is deep, it is difficult to accurately control the size during processing, and the hole shape accuracy is low. For example, the hole is elliptical, which is more common. This will result in excessive interference or too small or even no interference at some positions between the spiral oil guide plate and the center oil hole. When the interference is too large, the spiral oil guide plate is difficult to install, while when the interference is too small or there is no interference, the spiral oil guide plate is very likely to rotate, reducing the oil pumping efficiency during operation and causing oil shortage and wear of the pump body. However, the head interference fixation method has a large pressing length of the fixed structure, which is likely to generate iron filings during the assembly process. These iron filings are likely to cause wear between the compressor mating pairs when the compressor is running. Summary of the invention

[0004] Therefore, the present invention provides a crankshaft assembly and its assembly method, a compressor, and an air conditioner, which can overcome the technical problem in the related art that the head of the spiral oil guide plate is fixed to the center oil hole of the crankshaft by interference fit, the interference amount is difficult to control, resulting in difficulty in installation or easy rotation during operation, reducing the oil pumping efficiency, and there is also a technical problem that the interference fit section is too long and iron filings are easily generated during the assembly process.

[0005] In order to solve the above problems, the present invention provides a crankshaft assembly, including a crankshaft, a spiral oil guide plate and an oil suction pipe, the crankshaft having a central oil hole extending through at least one axial end thereof, the spiral oil guide plate including a continuously arranged external section, an interference fixing section and an internal section along its length direction, in the axial projection of the spiral oil guide plate along the crankshaft, the outer diameters of the external section and the internal section are not larger than the aperture of the central oil hole, the outer diameter of the interference fixing section is larger than the diameter of the central oil hole so as to form an interference fit with the inner wall of the central oil hole, a fitting section of the oil suction pipe is formed in an orifice at one end of the central oil hole, and the external section is located in the oil suction pipe.

[0006] In some embodiments, the axial outer end of the interference fixing section and the axial distance from the bottom of the central oil hole are not less than the axial inner end of the fitting section and the axial distance from the bottom of the central oil hole.

[0007] In some embodiments, the diameter of the central oil hole is d1, the outer diameter of the interference fixing section is D, and 0.05 mm < D - d1 < 0.2 mm; and / or, the depth of the central oil hole is H, the axial length of the interference fixing section is L, and L < 0.2H.

[0008] In some embodiments, the interference fixing section is provided with a perforated hole; and / or, there is a clearance fit between the outer section and the inner wall of the oil suction pipe, and there is a clearance fit between the inner section and the inner wall of the central oil hole.

[0009] In some embodiments, the inner end surface of the oil suction pipe abuts against the axial outer end of the interference fixing section.

[0010] In some embodiments, a positioning groove is formed on the inner end surface of the oil suction pipe, and the axial outer end portion of the interference fixing section is clamped in the positioning groove, and the inner end surface of the oil suction pipe abuts against the axial outer end of the interference fixing section through the bottom wall of the positioning groove.

[0011] In some embodiments, the interference amount between the oil suction pipe and the fitting section is greater than the interference amount between the interference fixing section and the central oil hole; or, the end of the inner section away from the outer section abuts against the bottom wall of the central oil hole.

[0012] The present invention also provides an assembling method for a crankshaft assembly as described above, including the following steps:

[0013] Insert the inner section of the spiral oil guiding piece into the central oil hole and make the axial inner end of the interference fixing section abut against the orifice of the central oil hole;

[0014] Sheath the oil suction pipe from the axial outer end of the outer section on the radial outside of the outer section;

[0015] Apply a force along the axial direction of the oil suction pipe to the oil suction pipe so that the oil suction pipe linearly moves along the axial direction of the central oil hole close to the bottom of the central oil hole until the inner end surface of the oil suction pipe is in interference fit with the fitting section to a target length.

[0016] In some embodiments, when there is a positioning groove on the inner end surface of the oil suction pipe, the positioning groove is also对位套装 (positionally sleeved) to the axial outer end of the interference fixing section while the oil suction pipe is sheathed from the axial outer end of the outer section on the radial outside of the outer section.

[0017] The present invention also provides a compressor, comprising the above crankshaft assembly.

[0018] The present invention also provides an air conditioner, comprising the above-mentioned compressor.

[0019] The crankshaft assembly and assembly method thereof, compressor and air conditioner provided by the present invention have the following beneficial effects:

[0020] The interference fixing section of the spiral oil guide plate is adjusted from the head position away from the oil suction pipe to the side close to the oil suction pipe, so that the interference fit position of the spiral oil guide plate and the center oil hole is in the area close to the orifice of the center oil hole. During the process of assembling the spiral oil guide plate into the center oil hole, the interference contact length between the two is significantly reduced, and the influence of the hole type processing accuracy of the center oil hole is small. The interference fit between the spiral oil guide plate and the center oil hole is more controllable and reliable, which can effectively prevent the phenomenon in the prior art that the interference amount between the spiral oil guide plate and the center oil hole is too large or too small, resulting in difficulty in installation or loose rotation during operation to reduce the pumping efficiency. At the same time, since the interference fit sliding contact length during the assembly process is significantly shortened, the generation of iron filings caused by long-term friction can also be avoided.

[0021] When assembling the spiral oil guide plate, the built-in section of the spiral oil guide plate can be first inserted into the central oil hole, and then the oil suction pipe can be inserted into the matching section along the axial direction of the crankshaft. During the insertion process of the oil suction pipe, the pipe outlet end face of the oil suction pipe (that is, the inner end face described later) will abut against the axial outer end face of the interference fixing section of the spiral oil guide plate. At this time, the spiral oil guide plate moves axially synchronously with the oil suction pipe during the assembly and matching process of the oil suction pipe to achieve an interference fit between its interference fixing section and the central oil hole, that is, the assembly of the oil suction pipe and the spiral oil guide plate can be completed by a single axial force press fitting, which simplifies the assembly process and improves the assembly efficiency.

[0022] By forming a positioning groove on the inner end surface of the oil suction pipe, and clamping the axial outer end portion of the interference fixing section of the spiral oil guide piece in the positioning groove after the oil suction pipe and the spiral oil guide piece are assembled on the crankshaft, the circumferential limit of the spiral oil guide piece can be achieved by utilizing the concave-convex plug-in connection between the positioning groove and the axial outer end of the interference fixing section, and then the interference amount between the interference fixing section and the center oil hole can be designed to be relatively small during the specific design, which can also effectively prevent the spiral oil guide piece from loosening and rotating during the operation of the crankshaft, and the smaller interference amount can further reduce the difficulty of assembling the spiral oil guide piece in the center oil hole;

[0023] By providing a hollow hole in the interference fixing section, the elastic deformation capacity of the interference fixing section can be improved, and the spiral oil guide piece can be prevented from being irregularly deformed under the action of the interference pressure during the assembly process, thereby reducing the oil pumping effect;

[0024] By matching the clearance between the external section and the oil suction pipe, and the clearance between the internal section and the central oil hole, the friction between the spiral oil guide plate and the oil suction pipe or the central oil hole during assembly can be further reduced, further reducing the difficulty of assembly and matching of the three. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0026] Figure 1 It is a schematic diagram of a state in which a spiral oil guide plate of a crankshaft assembly in the prior art is fixedly connected with the tail section of a central oil hole by means of interference fit at its head;

[0027] Figure 2 yes Figure 1 A magnified schematic diagram of the local structure in FIG.

[0028] Figure 3 is a longitudinal cross-sectional schematic diagram of a crankshaft assembly in an embodiment of the present invention;

[0029] Figure 4 yes Figure 1 A partial enlarged schematic diagram of the interference fixing section and the center oil hole in the matching state;

[0030] Figure 5 yes Figure 1 A partial enlarged schematic diagram of the interference fixing section in another embodiment in a state of cooperation with the central oil hole;

[0031] Figure 6 yes Figure 3 A schematic cross-sectional view of a crankshaft assembly at an interference fixing section of a spiral oil guide plate;

[0032] Figure 7 yes Figure 3 A side view of the spiral oil guide plate in FIG.

[0033] Figure 8 yes Figure 3 A schematic diagram of the three-dimensional structure of the oil suction pipe in one embodiment.

[0034] The accompanying drawings are marked as follows:

[0035] 1. Crankshaft; 11. Center oil hole; 2. Spiral oil guide plate; 21. External section; 22. Interference fixing section; 23. Internal section; 24. Hole; 3. Oil suction pipe; 31. Positioning groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0040] See also Figures 3 to 8 As shown, according to an embodiment of the present invention, a crankshaft assembly is provided, including a crankshaft 1, a spiral oil guide plate 2 and an oil suction pipe 3, wherein the crankshaft 1 has a central oil hole 11 extending through at least one axial end thereof, for example Figure 3As shown, the bottom end of the center oil hole 11 (with its orientation in a specific state of use as a reference, also referred to as the tail end) passes through to the bottom end face of the crankshaft 1. In some feasible embodiments, the center oil hole 11 also has a top end face that passes through the crankshaft 1. Of course, the center oil hole 11 is provided with corresponding oil outlet holes, so that the lubricating oil pumped up by the aforementioned spiral oil guide plate 2 can be delivered to the matching clearance of the rotating matching parts such as the flange mounted on the crankshaft 1 through these oil outlet holes, thereby achieving the lubrication purpose. The spiral oil guide plate 2 includes a continuously arranged external section 21, an interference fixing section 22 and an internal section 23 along its length direction. The aforementioned external section 21 and the internal section 23 are defined by whether they are placed in the center oil hole 11. In the spiral On the axial projection of the oil guide plate 2 along the crankshaft 1, the outer diameters of the external section 21 and the internal section 23 are no larger than the aperture of the center oil hole 11, the outer diameter of the interference fixing section 22 is larger than the diameter of the center oil hole 11 so as to form an interference fit with the inner wall of the center oil hole 11, and a fitting section of the oil suction pipe 3 is formed in the orifice at one end of the center oil hole 11 (not marked in the figure, but it should be noted that, for the sake of clear description of the technical solution, the fitting section here is defined as the hole section that is not the center oil hole 11), the external section 21 is located in the oil suction pipe 3 so as to achieve efficient pumping of the lubricating oil in the oil pool at the bottom of the compressor through the cooperation between the external section 21 and the oil suction pipe 3, and the oil suction pipe 3 is connected to the fitting section by interference fit.

[0041] In this technical solution, the interference fixing section 22 of the spiral oil guide plate 2 is adjusted from the head position away from the oil suction pipe 3 to the side close to the oil suction pipe 3, so that the interference fit position of the spiral oil guide plate 2 and the center oil hole 11 is in the area close to the orifice of the center oil hole 11. During the assembly of the spiral oil guide plate 2 into the center oil hole 11, the interference contact length (that is, the pressing depth) between the two is significantly reduced, and the influence of the hole processing accuracy of the center oil hole 11 is small. The interference fit between the spiral oil guide plate 2 and the center oil hole 11 is more controllable and reliable, which can effectively prevent the existing technology from causing the spiral oil guide plate 2 and the center oil hole 11 to be too large or too small, resulting in difficulty in installation or loose rotation during operation to reduce the oil pumping efficiency. At the same time, since the interference fit sliding contact length during the assembly process is significantly shortened, the generation of iron filings caused by long-term friction can also be avoided.

[0042] In some embodiments, when the spiral oil guide plate 2 is installed in the target position in the center oil hole 11, the axial distance between the axial outer end of the interference fixing section 22 (that is, the end close to the aforementioned oil suction pipe 3) and the bottom of the center oil hole 11 is not less than the axial distance between the axial inner end of the mating section (that is, the end of the mating section away from the aforementioned oil suction pipe 3) and the bottom of the center oil hole 11, that is, in the aforementioned assembled state, the axial outer end of the interference fixing section 22 is in extreme case flush with the axial inner end (end face) of the aforementioned mating section. It can be understood that at the beginning stage of assembling the spiral oil guide plate 2, the entire interference fixing section 22 will be axially outside the center oil hole 11.

[0043] In this technical solution, when assembling the spiral oil guide plate 2, the built-in section 23 of the spiral oil guide plate 2 can be first inserted into the central oil hole 11, and then the oil suction pipe 3 can be inserted into the matching section along the axial direction of the crankshaft 1. During the insertion process of the oil suction pipe 3, the tube outlet end face of the oil suction pipe 3 (that is, the inner end face described later) will abut against the axial outer end face of the interference fixing section 22 of the spiral oil guide plate 2. At this time, the spiral oil guide plate 2 moves axially synchronously with the oil suction pipe 3 during the assembly and matching process of the oil suction pipe 3 to achieve an interference fit between its interference fixing section 22 and the central oil hole 11, that is, the assembly of the oil suction pipe 3 and the spiral oil guide plate 2 can be completed by a single axial force press, which simplifies the assembly process and improves the assembly efficiency.

[0044] It can be understood that, when the oil suction pipe 3 and the spiral oil guide plate 2 are assembled with the crankshaft 1 , the inner end surface of the oil suction pipe 3 abuts against the axial outer end of the interference fixing section 22 .

[0045] In some other preferred embodiments, a positioning groove 31 is formed on the inner end surface of the oil suction pipe 3 (see Figure 8 As shown in the figure, the axial outer end portion of the interference fixing section 22 is clamped in the positioning groove 31, and the inner end surface of the oil suction pipe 3 abuts against the axial outer end of the interference fixing section 22 via the groove bottom wall of the positioning groove 31. The groove depth of the aforementioned positioning groove 31 should not be too large because the interference fixing section 22 has a certain spiral angle. In principle, it can ensure that the circumferential displacement of the spiral oil guide plate 2 is reliably limited.

[0046] In this technical solution, a positioning groove 31 is formed on the inner end surface of the oil suction pipe 3, and the axial outer end portion of the interference fixing section 22 of the spiral oil guide plate 2 is clamped in the positioning groove 31 after the oil suction pipe 3 and the spiral oil guide plate 2 are assembled on the crankshaft 1. The circumferential limitation of the spiral oil guide plate 2 can be achieved by utilizing the concave-convex plug-in connection between the positioning groove 31 and the axial outer end of the interference fixing section 22. Furthermore, in the specific design, the interference amount between the interference fixing section 22 and the center oil hole 11 can be designed to be relatively small, which can also effectively prevent the occurrence of loose rotation of the spiral oil guide plate 2 during the operation of the crankshaft. The smaller interference amount can further reduce the difficulty of assembling the spiral oil guide plate 2 in the center oil hole 11.

[0047] In some embodiments, two positioning grooves 31 are provided, and the two positioning grooves 31 are respectively engaged with the two sides of the axial outer end of the interference fixing section 22 in a one-to-one manner, so as to ensure that when force is applied to the oil suction pipe 3, the force can be evenly transmitted to the spiral oil guide plate 2, thereby reducing the irregular deformation of the spiral oil guide plate 2 caused by uneven force during the assembly process.

[0048] In some embodiments, the diameter of the central oil hole 11 is d1, and the outer diameter of the interference fixing section 22 is D, 0.05 mm. <D-d1<0.2mm。

[0049] In this technical solution, the interference amount between the central oil hole 11 and the interference fixing section 22 is limited, which can ensure a reliable and stable interference fit between the two while not increasing the difficulty of assembly due to excessive interference amount.

[0050] The depth of the central oil hole 11 is H, and the axial length of the interference fixing section 22 is L, where L<0.2H, so as to prevent the axial length of the fit between the two from being too large, increasing the difficulty of assembly.

[0051] See Figure 5 As shown in the figure, the structure in some other embodiments is shown. In this embodiment, the interference fixing section 22 is provided with a hollow hole 24, and the aforementioned hollow hole 24 specifically passes through the two opposite sides of the spiral oil guide plate 2. Its specific shape can be reasonably selected according to the actual rigidity requirements, such as Figure 5 As shown, the aforementioned hollow hole 24 is specifically a long waist hole type, and the length of the aforementioned hollow hole 24 can be slightly larger than the axial length of the interference fixing section 22.

[0052] In this technical solution, by providing a hollow hole 24 in the interference fixing section 22, the elastic deformation capacity of the interference fixing section 22 can be improved, preventing the spiral oil guide plate 2 from being irregularly deformed under the action of the interference pressure during the assembly process, thereby reducing the oil pumping effect.

[0053] In some embodiments, the external section 21 is clearance-matched with the inner wall of the oil suction pipe 3 , and the internal section 23 is clearance-matched with the inner wall of the central oil hole 11 .

[0054] In this technical solution, by matching the clearance between the external section 21 and the oil suction pipe 3, and the clearance between the internal section 23 and the center oil hole 11, the friction between the spiral oil guide plate 2 and the oil suction pipe 3 or the center oil hole 11 during the assembly process can be further reduced, thereby further reducing the difficulty of assembly and matching of the three.

[0055] Due to the circumferential limiting positioning effect of the positioning groove 31 on the inner end surface of the oil suction pipe 3 in the present invention on the spiral oil guide plate 2, in some embodiments, the interference between the oil suction pipe 3 and the mating section is greater than the interference between the interference fixing section 22 and the center oil hole 11, that is, the interference between the interference fixing section 22 and the center oil hole 11 can be reduced, further reducing the difficulty of assembling the spiral oil guide plate 2 while ensuring the position reliability of the spiral oil guide plate 2.

[0056] In some embodiments, one end (i.e., the inner end) of the built-in segment 23 away from the external segment 21 abuts against the bottom wall of the center oil hole 11. For example, a sheet with a smaller width is formed on the inner end surface of the built-in segment 23. The sheet has a certain complete deformation ability, one end of which is integrally formed with the built-in segment 23, and the other end abuts against the bottom wall of the center oil hole 11, so that the elastic force can be used to achieve axial limitation of the axial inner end of the spiral oil guide plate 2, thereby ensuring the reliable and stable axial position of the spiral oil guide plate 2.

[0057] According to an embodiment of the present invention, there is also provided a method for assembling the crankshaft assembly as described above, comprising the following steps:

[0058] First, the built-in section 23 of the spiral oil guide plate 2 is inserted into the central oil hole 11 and the axial inner end of the interference fixing section 22 is in contact with the orifice of the central oil hole 11, that is, the axial inner end of the interference fixing section 22 is located at the orifice of the central oil hole 11. At this time, the built-in section 23 is located in the central oil hole 11 and can play a certain guiding role in the axial feeding and pressing of the spiral oil guide plate 2.

[0059] Afterwards, the oil suction pipe 3 is sleeved from the axial outer end of the external section 21 to the radial outer side of the external section 21. At this time, it can be understood that when the oil suction pipe 3 is linearly moved close to the spiral oil guide plate 2 by the axial force applied along the axial direction of the crankshaft 1, the inner end surface of the oil suction pipe 3 will contact the axial outer end of the interference fixing section 22 of the spiral oil guide plate 2;

[0060] A force is applied to the oil suction pipe 3 along the axial direction of the oil suction pipe 3 so that the oil suction pipe 3 moves in a straight line along the axial direction of the center oil hole 11 close to the bottom of the center oil hole 11. At this time, it can be understood that the spiral oil guide plate 2 will follow the oil suction pipe 3 and move in a straight line along the axial direction of the crankshaft 1 under the action of the displacement force of the oil suction pipe 3 until the inner end face of the oil suction pipe 3 is interference fit with the mating section to the target length, thereby completing the assembly of the oil suction pipe 3, the spiral oil guide plate 2 and the crankshaft 1 at one time, and the operation is very simple.

[0061] This technical solution realizes that the oil suction pipe 3 and the spiral oil guide plate 2 can be assembled by a single axial force press, which simplifies the assembly process and improves the assembly efficiency.

[0062] In some embodiments, when the inner end surface of the oil suction pipe 3 has a positioning groove 31, the oil suction pipe 3 is sleeved from the axial outer end of the external section 21 to the radial outer side of the external section 21, and the positioning groove 31 is also aligned and sleeved to the axial outer end of the interference fixing section 22.

[0063] The present invention also provides a compressor, including the above-mentioned crankshaft assembly. Due to the use of the above-mentioned crankshaft assembly of the present invention, the interference fixing section 22 of the spiral oil guide plate 2 is adjusted from the head position away from the oil suction pipe 3 to the side close to the oil suction pipe 3, so that the interference fit position of the spiral oil guide plate 2 and the center oil hole 11 is in the area close to the orifice of the center oil hole 11. During the assembly of the spiral oil guide plate 2 into the center oil hole 11, the interference contact length (that is, the pressing depth) between the two is significantly reduced, and the influence of the hole processing accuracy of the center oil hole 11 is small. The interference fit between the spiral oil guide plate 2 and the center oil hole 11 is more controllable and reliable, which can effectively prevent the existing technology from causing the spiral oil guide plate 2 and the center oil hole 11 to be too large or too small, resulting in difficulty in installation or loose rotation during operation to reduce the pumping efficiency. At the same time, since the interference fit sliding contact length during the assembly process is significantly shortened, the generation of iron filings caused by long-term friction can also be avoided.

[0064] The present invention also provides an air conditioner, comprising the above-mentioned compressor.

[0065] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A crankshaft assembly, comprising a crankshaft (1), a spiral oil guide plate (2) and an oil suction pipe (3), wherein the crankshaft (1) has a central oil hole (11) extending through at least one axial end thereof, and wherein: The spiral oil guiding piece (2) includes an externally arranged section (21), an interference-fitted section (22), and an internally arranged section (23) that are continuously arranged along its length direction. In the axial projection of the spiral oil guiding piece (2) along the crankshaft (1), the outer diameters of the externally arranged section (21) and the internally arranged section (23) are not greater than the aperture diameter of the central oil hole (11), and the outer diameter of the interference-fitted section (22) is greater than the diameter of the central oil hole (11) to form an interference fit with the inner wall of the central oil hole (11). A mating section of the suction oil pipe (3) is formed in one end orifice of the central oil hole (11), and the externally arranged section (21) is located inside the suction oil pipe (3).

2. The crankshaft assembly according to claim 1, characterized in that The axial outer end of the interference-fitted section (22) and the axial distance from the bottom of the central oil hole (11) are not less than the axial inner end of the mating section and the axial distance from the bottom of the central oil hole (11).

3. The crankshaft assembly according to claim 1, characterized in that The diameter of the central oil hole (11) is d1, and the outer diameter of the interference-fitted section (22) is D, where 0.05mm < D - d1 < 0.2mm; and / or, the hole depth of the central oil hole (11) is H, and the axial length of the interference-fitted section (22) is L, where L < 0.2H.

4. The crankshaft assembly according to claim 1, characterized in that Hollow holes (24) are provided in the interference-fitted section (22); and / or, there is a clearance fit between the externally arranged section (21) and the inner wall of the suction oil pipe (3), and there is a clearance fit between the internally arranged section (23) and the inner wall of the central oil hole (11).

5. The crankshaft assembly according to claim 1, characterized in that The inner end face of the suction oil pipe (3) abuts against the axial outer end of the interference-fitted section (22).

6. The crankshaft assembly according to claim 5, characterized in that A positioning groove (31) is formed on the inner end face of the suction oil pipe (3), and the axial outer end portion of the interference-fitted section (22) is clamped in the positioning groove (31), and the inner end face of the suction oil pipe (3) abuts against the axial outer end of the interference-fitted section (22) through the bottom wall of the positioning groove (31).

7. The crankshaft assembly according to claim 1, characterized in that The interference amount between the suction oil pipe (3) and the mating section is greater than the interference amount between the interference-fitted section (22) and the central oil hole (11); or, the end of the internally arranged section (23) away from the externally arranged section (21) abuts against the bottom wall of the central oil hole (11).

8. A method for assembling a crankshaft assembly according to any one of claims 2 to 7, characterized in that: It includes the following steps: Insert the internally arranged section (23) of the spiral oil guiding piece (2) into the central oil hole (11) and make the axial inner end of the interference-fitted section (22) abut against the orifice of the central oil hole (11); Sheath the suction oil pipe (3) from the axial outer end of the externally arranged section (21) on the radial outside of the externally arranged section (21); Apply a force along the axial direction of the suction oil pipe (3) to the suction oil pipe (3) to make the suction oil pipe (3) linearly move along the axial direction of the central oil hole (11) close to the bottom of the central oil hole (11) until the inner end face of the suction oil pipe (3) is interference-fitted with the mating section to the target length.

9. The assembly method according to claim 8, characterized in that: When the inner end surface of the oil suction pipe (3) is provided with a positioning groove (31), the oil suction pipe (3) is sleeved from the axial outer end of the external section (21) to the radial outer side of the external section (21), and the positioning groove (31) is also sleeved to the axial outer end of the interference fixing section (22) at the same time.

10. A compressor, characterized in that: A crankshaft assembly comprising any one of claims 1 to 7.

11. An air conditioner, characterized in that: Comprising the compressor as claimed in claim 10.

Images