Piston connecting rod arrangement, method for assembling a piston connecting rod arrangement, compressor and refrigeration appliance

Abstract

The application discloses a piston connecting rod device, an assembling method thereof, a compressor and a refrigeration device. The piston connecting rod device comprises a piston, a boss, a ball head, a cover plate and a connecting rod. The piston has a piston head and a piston skirt. The piston skirt is provided with a welding clearance hole for connecting the inside and outside of the piston. The boss is located in the piston skirt and arranged on the piston head. The cover plate is sleeved outside the boss and limits the ball head between the cover plate and the boss. The cover plate and the boss are fixed by laser penetration welding through the welding clearance hole. The connecting rod passes through the cover plate and is connected with the ball head. The piston connecting rod device can reduce the manufacturing precision requirement of the crankcase, the connecting rod and the piston.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a piston connecting rod device and its assembly method, a compressor, and refrigeration equipment. Background Technology

[0002] In related technologies, the piston and connecting rod of a compressor are connected by an insert-type piston pin connection. This pin connection requires very high manufacturing precision for components such as the crankcase, connecting rod, and piston, resulting in higher parts processing costs. Summary of the Invention

[0003] The main objective of this invention is to provide a piston connecting rod device that aims to reduce the manufacturing precision requirements for components such as crankcases, connecting rods, and pistons.

[0004] To achieve the above objectives, the present invention provides a piston connecting rod device, comprising:

[0005] A piston having a piston head and a piston skirt, wherein the piston skirt has a welding clearance hole that connects the inside and outside of the piston;

[0006] A boss is located inside the piston skirt and is provided on the piston head;

[0007] Ball head;

[0008] A cover plate is fitted over the boss, such that the ball head is positioned between the cover plate and the boss. The cover plate and the boss are fixed together by laser penetration welding through the welding clearance hole.

[0009] The connecting rod passes through the cover plate and connects to the ball head.

[0010] In one embodiment, there are multiple welding clearance holes, which are arranged at intervals along the circumference of the piston skirt. There are multiple welding points between the cover plate and the boss, and the multiple welding points are matched one-to-one with the multiple welding clearance holes.

[0011] In one embodiment, the boss is integrally formed with the piston.

[0012] In one embodiment, the boss is coaxially arranged with the piston skirt.

[0013] In one embodiment, the boss is cylindrical, the cover plate has a surrounding portion fitted around the boss, and the welding point is located between the surrounding portion and the boss, the surrounding portion being cylindrical.

[0014] In one embodiment, the boss has a first groove, the cover plate has a second groove, and the ball head is located within the limiting space formed by the first groove and the second groove;

[0015] The inner wall of the first groove has a first spherical surface that fits against the ball head, and the inner wall of the second groove has a second spherical surface that fits against the ball head; and / or

[0016] In the axial direction of the piston skirt, the depth of the first groove is greater than the depth of the second groove.

[0017] In one embodiment, the cover plate has an anti-expansion and anti-contraction through hole, which is located on the side of the welding point away from the piston head, and each welding point is provided with at least one anti-expansion and anti-contraction through hole.

[0018] In one embodiment, the ball head is located within the limiting space formed by the cover plate and the boss, and the anti-expansion and contraction through hole connects the limiting space and the piston skirt.

[0019] In one embodiment, the cover plate includes a surrounding portion, a connecting portion, and a limiting portion connected in sequence. The surrounding portion is sleeved outside the boss, the welding point is located between the surrounding portion and the boss, the ball head is located between the limiting portion and the boss, and the anti-expansion and contraction through hole is located on the connecting portion.

[0020] In one embodiment, the anti-expansion through hole extends to the connection between the connecting portion and the surrounding portion.

[0021] In one embodiment, the ball head is located within the limiting space formed by the cover plate and the boss, and the boss has an oil hole that connects the limiting space and the piston skirt.

[0022] In one embodiment, the axis of the oil hole is perpendicular to the axis of the boss.

[0023] In one embodiment, an oil reservoir is provided on the outer wall of the piston skirt, and the oil reservoir is independent of the welding clearance hole.

[0024] In one embodiment, the oil reservoir extends circumferentially around the piston skirt; and / or

[0025] The oil reservoir is located between the weld clearance hole and the piston head.

[0026] In one embodiment, the ball head has a first mounting hole, the connecting rod has a first welding surface and a first insertion portion protruding from the first welding surface, the first insertion portion is inserted into the first mounting hole, and the first welding surface is welded to the outer surface of the ball head; and / or

[0027] The piston connecting rod assembly further includes a crank ring, the crank ring having a second mounting hole, the connecting rod having a second welding surface and a second insertion portion protruding from the second welding surface, the second insertion portion being inserted into the second mounting hole, and the second welding surface being welded to the outer surface of the crank ring.

[0028] The present invention also provides an assembly method for a piston connecting rod device, comprising the following steps:

[0029] The cover plate is fitted over the boss, such that the ball head is confined between the cover plate and the boss, wherein the boss is located within the piston skirt of the piston and is located on the piston head of the piston; and

[0030] The boss and cover plate are fixed by laser penetration welding through a welding clearance hole. The welding clearance hole is located on the piston skirt and connects the inside and outside of the piston.

[0031] In one embodiment, prior to the step of fitting the cover plate over the boss and confining the ball head between the cover plate and the boss, the following step is further included:

[0032] Place the piston on the mounting platform with the piston skirt positioned above the piston head.

[0033] In one embodiment, in the step of fixing the boss and the cover plate by laser penetration welding through the welding clearance hole, the ball head is fixedly connected to the connecting rod, and the cover plate is inserted through the connecting rod.

[0034] The present invention also provides a compressor including the piston connecting rod device described above.

[0035] The present invention also provides a refrigeration device, including the compressor described above.

[0036] In the aforementioned piston-connecting rod assembly, the cover plate and the boss are fixed by laser penetration welding through welding clearance holes, thereby achieving the assembly of the ball head and the piston. The connecting rod passes through the cover plate and connects to the ball head, thus achieving the assembly of the connecting rod and the piston through the ball head. Because the connecting rod and the piston are connected by the ball head, a good spherical friction pair can be formed between the connecting rod and the piston, thereby allowing the connecting rod and the piston to have good transmission freedom.

[0037] Moreover, in the aforementioned piston connecting rod assembly, the cover plate and the boss are first controlled to form a limiting space for accommodating the ball head. Then, the cover plate and the boss are fixed by laser penetration welding through the welding clearance hole, thus completing the assembly. The assembly connection method is simple, which can reduce the manufacturing precision requirements of the compressor's crankcase, connecting rod, piston and other parts, thereby reducing manufacturing costs and enhancing product competitiveness.

[0038] Furthermore, in the aforementioned piston-connecting rod assembly, the variation in the fit clearance between the boss and the ball head caused by the expansion and contraction of the weld joint can be reduced by increasing the thickness of the boss. This prevents the fit clearance between the boss and the ball head from deviating from the preset clearance, thereby enabling the connecting rod and piston to form a good spherical friction pair. The clearance between the boss and the ball head is reasonable, there are no intermittent impact loads, lubrication is sufficient, and frictional power consumption is low. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 This is a three-dimensional structural schematic diagram of a piston connecting rod device according to an embodiment of the present invention;

[0041] Figure 2 for Figure 1 An exploded perspective view of the piston-connecting rod assembly shown.

[0042] Figure 3 for Figure 1 A top view of the piston-connecting rod assembly shown;

[0043] Figure 4 For along Figure 3 Cross-sectional view of line AA in the middle;

[0044] Figure 5 for Figure 1 The diagram shows the assembly of the piston and the boss in the piston-connecting rod assembly.

[0045] Figure 6 for Figure 1 A three-dimensional structural schematic diagram of the cover plate of the piston connecting rod assembly shown;

[0046] Figure 7 for Figure 1 A three-dimensional structural schematic diagram of the cover plate of the piston connecting rod assembly shown from another perspective;

[0047] Figure 8 This is a flowchart of an assembly method for a piston connecting rod device according to an embodiment of the present invention.

[0048] Explanation of icon numbers:

[0049]

[0050]

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0054] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0055] This invention proposes a piston connecting rod device.

[0056] In embodiments of the present invention, such as Figures 1-4 As shown, the piston-connecting rod assembly 10 includes a piston 200, a boss 300, a ball head 400, a cover plate 500, and a connecting rod 600.

[0057] The piston 200 has a piston head 210 and a piston skirt 220. The piston skirt 220 is a hollow structure with openings at both ends; therefore, it can be considered that the piston skirt 220 has a cavity 200a and two open ends 200b. The piston head 210 is located at one of the two open ends 200b of the piston skirt 220; therefore, the piston 200 can be considered a hollow structure with an opening at one end and an end plate at the other end. Specifically, in this embodiment, the piston head 210 and the piston skirt 220 are integrally formed, and both the inner and outer walls of the piston skirt 220 are cylindrical, that is, the outer peripheral wall of the piston 200 is cylindrical.

[0058] The boss 300 is located inside the piston skirt 220 and is disposed on the piston head 210. The cover plate 500 is sleeved on the boss 300, so that the ball head 400 is limited between the cover plate 500 and the boss 300. That is, in this embodiment, the outer wall surface of the boss 300 and the inner wall surface of the piston skirt 220 are spaced apart, so that the wall plate of the cover plate 500 can enter between the outer wall surface of the boss 300 and the inner wall surface of the piston skirt 220, thereby realizing that the cover plate 500 is sleeved on the boss 300.

[0059] In this embodiment, the piston skirt 220 has a welding clearance hole 222 that connects the inside and outside of the piston 200. The cover plate 500 and the boss 300 are fixed together by laser penetration welding through the welding clearance hole 222, thus enabling the assembly of the ball head 400 and the piston 200. It should be noted that fixing the cover plate 500 and the boss 300 together by laser penetration welding through the welding clearance hole 222 means that when fixing the cover plate 500 and the boss 300, the laser passes through the welding clearance hole 222 and reaches the cover plate 500, causing the cover plate 500 to be fused and welded to the boss 300.

[0060] Connecting rod 600 passes through cover plate 500 and connects to ball joint 400. Thus, connecting rod 600 and piston 200 can be assembled via ball joint 400. Furthermore, connecting connecting rod 600 and piston 200 via ball joint 400 allows for the formation of a good spherical friction pair, thereby providing good transmission freedom for both connecting rod 600 and piston 200.

[0061] In the aforementioned piston-connecting rod assembly 10, the cover plate 500 and the boss 300 are fixed by laser penetration welding through the welding clearance hole 222, thereby achieving the assembly of the ball head 400 and the piston 200. The connecting rod 600 passes through the cover plate 500 and connects to the ball head 400, thus achieving the assembly of the connecting rod 600 and the piston 200 through the ball head 400. Since the connecting rod 600 and the piston 200 are connected through the ball head 400, a good spherical friction pair can be formed between the connecting rod 600 and the piston 200, thereby allowing the connecting rod 600 and the piston 200 to have good transmission freedom.

[0062] Furthermore, in the aforementioned piston connecting rod assembly 10, the cover plate 500 and the boss 300 are first controlled to form a limiting space for accommodating the ball head 400. Then, the cover plate 500 and the boss 300 are fixed by laser penetration welding through the welding clearance hole 222, thus completing the assembly. The assembly connection method is simple, which can reduce the manufacturing precision requirements of the compressor's crankcase, connecting rod, piston and other parts, thereby reducing manufacturing costs and enhancing product competitiveness.

[0063] Furthermore, in the aforementioned piston-connecting rod assembly 10, the variation in the mating clearance between the boss 300 and the ball head 400 caused by weld expansion and contraction can be reduced by increasing the thickness of the boss 300. This prevents the mating clearance between the boss 300 and the ball head 400 from deviating from the preset clearance, thereby enabling the connecting rod 600 and the piston 200 to form a good spherical friction pair. The clearance between the boss 300 and the ball head 400 is reasonable, there are no intermittent impact loads, lubrication is sufficient, and frictional power consumption is low. Specifically, in this embodiment, the thickness of the end of the boss 300 away from the piston head 210 is twice or more than the thickness of the end of the cover plate 500 near the piston head 210. More specifically, the thickness of the end of the boss 300 away from the piston head 210 is three times or more than the thickness of the end of the cover plate 500 near the piston head 210.

[0064] In this embodiment, there are multiple welding clearance holes 222. These multiple welding clearance holes 222 are arranged at intervals along the circumference of the piston skirt 220. Multiple welding points are present between the cover plate 500 and the boss 300. Each welding point is paired with one welding clearance hole 222. That is, in this embodiment, the cover plate 500 and the boss 300 are fixedly connected by spot welding. Compared to a continuous circumferential weld, i.e., compared to a full weld, the axial and radial expansion and contraction of the welding points are smaller. The axial expansion and contraction of the welding points will not cause deformation of the cover plate 500 and the boss 300, thus preventing the fit clearance between the boss 300 and the ball head 400 from deviating from the preset clearance, and the fit clearance between the ball head 400 and the cover plate 500 from deviating from the preset clearance. This allows the connecting rod 600 and the piston 200 to form a good spherical friction pair. The clearances between the ball head 400 and the boss 300 and the cover plate 500 are reasonable, with no intermittent impact loads, sufficient lubrication, and low frictional power consumption.

[0065] In this embodiment, multiple welding clearance holes 222 are arranged at equal intervals along the circumference of the piston skirt 220. This facilitates the secure fixing of the cover plate 500 and the boss 300. Specifically, in this embodiment, there are four welding clearance holes 222, which are arranged at equal intervals along the circumference of the piston skirt 220. It is understood that in other embodiments, the number of welding clearance holes 222 may be less than four, for example, two or three, or more than four.

[0066] In this embodiment, as Figure 5 As shown, the boss 300 and piston 200 are integrally formed. This simplifies the assembly and connection of the piston-connecting rod assembly 10, further reducing the precision requirements for the manufacturing of components such as the compressor crankcase, connecting rod, and piston. This, in turn, reduces manufacturing costs, enhances product competitiveness, and facilitates the miniaturization of the piston 200 (space is needed to accommodate installation tools when installing the boss 300 within the piston 200). It is understood that in other embodiments, the boss 300 and piston 200 can also be assembled by welding. In this embodiment, the material of the boss 300 is the same as that of the piston 200, both being weldable materials. It is understood that in other embodiments, the material of the boss 300 and piston 200 may be different, where the boss 300 is made of a weldable material, while the piston 200 is made of a non-weldable material.

[0067] In this embodiment, the boss 300 and the piston skirt 220 are coaxially arranged. This allows control over the distance between the outer wall of the boss 300 and the inner wall of the piston skirt 220, making it easier to control the welding distance when using laser penetration welding to fix the cover plate 500 and the boss 300. This ensures that the welding effect is approximately the same everywhere, simplifying the assembly and connection of the piston connecting rod device 10. For example, when both the boss 300 and the piston skirt 220 are cylindrical, their coaxial arrangement ensures that the distance between the outer wall of the boss 300 and the inner wall of the piston skirt 220 is equal everywhere. Conversely, when both the boss 300 and the piston skirt 220 are square, their coaxial arrangement ensures that the distance between the four outer walls of the boss 300 and the four inner walls of the piston skirt 220 is equal. It is understood that in other embodiments, the boss 300 and the piston skirt 220 may be coaxial.

[0068] In this embodiment, the axis of the welding clearance hole 222 is perpendicular to the axis of the piston skirt 220. This facilitates welding.

[0069] In this embodiment, as Figures 4-7 As shown, the boss 300 is cylindrical. The cover plate 500 has a surrounding portion 510 that fits around the boss 300, and the welding point is located between the surrounding portion 510 and the boss 300. The surrounding portion 510 is cylindrical. This facilitates the assembly of the boss 300 and the cover plate 500. It is understood that in other embodiments, both the boss 300 and the surrounding portion 510 can be square, hexagonal, or other shapes.

[0070] In this embodiment, the surrounding portion 510 is a continuous ring. It can be understood that in other embodiments, the surrounding portion 510 can be an intermittent ring. For example, the surrounding portion 510 includes multiple branches, which are spaced around the boss, and the welding point is located between the branch and the boss 300.

[0071] In this embodiment, the boss 300 has a first groove 310. The cover plate 500 has a second groove 532. The ball head 400 is located within the limiting space formed by the first groove 310 and the second groove 532. The inner wall of the first groove 310 has a first spherical surface 312. The first spherical surface 312 fits against the ball head 400, that is, the diameter of the first spherical surface 312 is the same as the diameter of the ball head 400. The inner wall of the second groove 532 has a second spherical surface 5322. The second spherical surface 5322 fits against the ball head 400, that is, the diameter of the second spherical surface 5322 is the same as the diameter of the ball head 400. In this way, the connecting rod 600 connected to the ball head 400 can have the function of universal rotation. It can be understood that in other embodiments, the connecting rod 600 connected to the ball head 400 may not have the function of universal rotation. In this case, the boss 300 may not have the first spherical surface 312 and / or the cover plate 500 may not have the second spherical surface 5322. It is understood that in other embodiments, the first groove 310 and / or the second groove 532 may also be omitted, and the ball head 400 can be limited to the area between the boss 300 and the cover plate 500.

[0072] In this embodiment, the first spherical surface 312 and the boss 300 are coaxially arranged. That is, in this embodiment, the first spherical surface 312, the boss 300, and the piston skirt 220 are coaxially arranged. This facilitates the miniaturization of the piston 200 and allows for the arrangement of components such as the boss 300, the sphere 400, and the cover plate 500 within the limited space of the piston 200. It is understood that in other embodiments, the first spherical surface 312 and the boss 300 may be coaxially arranged.

[0073] In this embodiment, the second spherical surface 5322 is coaxially arranged with the cover plate 500. This facilitates the miniaturization of the cover plate 500 and allows for the arrangement of components such as the boss 300 and the sphere 400 within the limited space of the cover plate 500. It is understood that in other embodiments, the second spherical surface 5322 and the cover plate 500 may also be coaxially arranged.

[0074] In this embodiment, the depth of the first groove 310 in the axial direction of the piston skirt 220 is greater than the depth of the second groove 532. This facilitates the assembly of the ball head 400. For example, when the piston 200 is placed on the mounting platform with the piston skirt 220 above the piston head 210, that is, with the open end 200b of the piston 200 facing upwards, the deeper first groove 310 can more stably support the ball head 400 under the action of gravity, thus eliminating the need for auxiliary fixation of the ball head 400 during subsequent welding.

[0075] In this embodiment, the ball head 400 is located within the limiting space formed by the cover plate 500 and the boss 300. Specifically, in this embodiment, the first groove 310 and the second groove 532 enclose and form the limiting space.

[0076] In this embodiment, the cover plate 500 is provided with an anti-expansion and contraction through hole 522, which is located on the side of the welding point away from the piston head 210. At least one anti-expansion and contraction through hole 522 is provided for each welding point. The anti-expansion and contraction through hole 522 can block the radial expansion and contraction of the welding point on the cover plate 500, thus providing a good buffer against welding deformation. This greatly reduces the pressure exerted on the ball head 400 by the welding deformation of the cover plate 500. After welding, the spherical friction pair formed between the piston 200 and the connecting rod 600 has a reasonable clearance and no intermittent impact load.

[0077] In this embodiment, the anti-expansion / contraction through-hole 522 connects the limiting space and the piston skirt 220. Thus, the anti-expansion / contraction through-hole 522 can also be used for oil guiding; lubricating oil can enter the limiting space through the anti-expansion / contraction through-hole 522 to fully lubricate the ball head 400 (spherical friction pair). That is, in this embodiment, the anti-expansion / contraction through-hole 522 has dual functions of anti-expansion / contraction and oil guiding. In this embodiment, the anti-expansion / contraction through-hole 522 corresponding to the welding point is the first anti-expansion / contraction through-hole. In this embodiment, an anti-expansion / contraction through-hole 522 can also be provided between two adjacent welding points; this is the second anti-expansion / contraction through-hole 522, and its main function is oil guiding. It can be understood that in other embodiments, the anti-expansion / contraction through-hole 522 can be omitted. In this case, the cover plate 500 can have oil guiding through-holes. The oil guiding through-holes do not necessarily correspond to the welding points, and the number of oil guiding through-holes can be less than or greater than the number of welding points.

[0078] In this embodiment, the cover plate 500 includes a surrounding portion 510, a connecting portion 520, and a limiting portion 530 connected in sequence. The surrounding portion 510 is sleeved on the outside of the boss 300, and the welding point is located between the surrounding portion 510 and the boss 300. The ball head 400 is located between the limiting portion 530 and the boss 300. The second groove 532 is located on the limiting portion 530. The anti-expansion and contraction through hole 522 is located on the connecting portion 520. It can be understood that in other embodiments, the connecting portion 520 may be omitted. In this case, the anti-expansion and contraction through hole 522 may be provided on the surrounding portion 510 or the oil guiding through hole may be provided on the limiting portion 530.

[0079] In this embodiment, the anti-expansion through-hole 522 extends to the connection between the connecting portion 520 and the surrounding portion 510. Thus, the anti-expansion through-hole 522 can better block the radial expansion and contraction of the welding point on the limiting portion 530. It is understood that in other embodiments, the anti-expansion through-hole 522 may also be located in the middle of the connecting portion 520.

[0080] In this embodiment, the connecting part 520 has a flange surface 524 located outside the cover plate 500. The flange surface 524 facilitates the use of a robotic arm to grip the cover plate 500 during assembly line production, thereby making assembly easier.

[0081] In this embodiment, the limiting part 530 has a clearance hole 534. The connecting rod 600 passes through the cover plate 500 through the clearance hole 534.

[0082] In this embodiment, the surrounding portion 510, the connecting portion 520, and the limiting portion 530 are integrally formed. This makes it easier to manufacture the cover plate 500.

[0083] In this embodiment, the boss 300 has an oil hole 320. The oil hole 320 connects the limiting space and the piston skirt 220, meaning that the cover plate 500 does not cover the oil hole 320, and the oil hole 320 is exposed relative to the cover plate 500. Specifically, in this embodiment, the oil hole 320 is located between the piston head 210 and the cover plate 500. It can be understood that in other embodiments, when the surrounding portion 510 includes multiple branches, and the multiple branches are spaced around the boss, with the welding point located between the branch and the boss 300, the oil hole 320 can be located between two adjacent branches. The oil hole 320 can be used for oil guiding; lubricating oil can enter the limiting space through the oil hole 320 to fully lubricate the ball head 400 (spherical friction pair).

[0084] In this embodiment, the axis of the oil hole 320 is perpendicular to the axis of the boss 300. This facilitates oil guidance through the oil hole 320. It is understood that in other embodiments, the axis of the oil hole 320 may also be inclined relative to the axis of the boss 300.

[0085] In this embodiment, an oil reservoir 224 is provided on the outer wall of the piston skirt 220. Thus, lubricating oil is stored in the oil reservoir 224. Specifically, in this embodiment, the oil reservoir 224 extends circumferentially around the piston skirt 220, that is, the oil reservoir 224 is a closed ring.

[0086] In this embodiment, the oil reservoir 224 and the welding clearance hole 222 are independent of each other, meaning they are not connected. This avoids the oil reservoir 224 interfering with laser penetration welding. If the oil reservoir 224 were connected to the welding clearance hole 222, laser light would leak from the oil reservoir 224 during laser penetration welding through the welding clearance hole 222. Specifically, in this embodiment, the oil reservoir 224 is located between the welding clearance hole 222 and the piston head 210, meaning it is located below the welding clearance hole 222. This facilitates the oil reservoir 224's reception and discharge of lubricating oil. It is understood that in other embodiments, the oil reservoir 224 may also be located above the welding clearance hole 222.

[0087] In this embodiment, as Figures 1-4 As shown, the ball head 400 has a first mounting hole 410. The connecting rod 600 has a first welding surface 610 and a first insertion portion 620 protruding from the first welding surface 610. The first insertion portion 620 is inserted into the first mounting hole 410. The first welding surface 610 is welded to the outer surface of the ball head 400. By providing the first mounting hole 410 and the first insertion portion 620, the ball head 400 and the connecting rod 600 can be positioned and welded, which is more conducive to assembly. It can be understood that in other embodiments, the first mounting hole 410 and the first insertion portion 620 can be omitted, in which case the ball head 400 can be directly welded to the connecting rod 600. Specifically, in this embodiment, the first mounting hole 410 is a blind hole. It can be understood that in other embodiments, the first mounting hole 410 can also be a through hole.

[0088] In this embodiment, the piston connecting rod assembly 10 further includes a crank ring 700. The crank ring 700 has a second mounting hole 710. The connecting rod 600 has a second welding surface 630 and a second insertion portion 640 protruding from the second welding surface 630. The second insertion portion 640 is inserted into the second mounting hole 710. The second welding surface 630 is welded to the outer surface of the crank ring 700. By providing the second mounting hole 710 and the second insertion portion 640, the crank ring 700 and the connecting rod 600 can be positioned and welded, which is more conducive to assembly. It can be understood that in other embodiments, the second mounting hole 710 and the second insertion portion 640 can be omitted, in which case the crank ring 700 can be directly welded to the connecting rod 600. Specifically, in this embodiment, the second mounting hole 710 is a blind hole. It can be understood that in other embodiments, the second mounting hole 710 can also be a through hole.

[0089] like Figure 8 As shown, the present invention also proposes an assembly method for a piston connecting rod device, comprising the following steps:

[0090] In step S820, the cover plate is fitted over the boss, and the ball head is limited between the cover plate and the boss, wherein the boss is located inside the piston skirt of the piston and is located on the piston head of the piston.

[0091] In step S830, the boss and the cover plate are fixed by laser penetration welding through the welding clearance hole. The welding clearance hole is located on the piston skirt and connects the inside and outside of the piston.

[0092] In this embodiment, before the step of fitting the cover plate over the boss and limiting the ball head to the space between the cover plate and the boss, that is, before step S820, the following steps are also included:

[0093] In step S810, the piston is placed on the mounting platform, with the piston skirt positioned above the piston head. This allows the ball head and cover plate to be supported by gravity on the boss during assembly, eliminating the need for additional fixing and simplifying the process.

[0094] In this embodiment, in step S820, the ball head is fixedly connected to the connecting rod, and the cover plate passes through the connecting rod. In this embodiment, before the step of fitting the cover plate over the boss and limiting the ball head to between the cover plate and the boss, that is, before step S820, the following steps are also included:

[0095] Step S822: Securely connect the ball head to the connecting rod.

[0096] Step S824: Pass the cover plate through the connecting rod from the end away from the ball head onto the connecting rod.

[0097] It is understood that in other embodiments, in step S820, the ball head may be separated from the connecting rod, and the cover plate may also be separated from the connecting rod. In this case, between step S820 and step S830, or after step S830, the following steps may also be included:

[0098] The connecting rod passes through the cover plate and connects to the ball head.

[0099] In this embodiment, in step S820, the connecting rod is fixedly connected to the crank ring. In this embodiment, before the step of fitting the cover plate over the boss and limiting the ball head to the space between the cover plate and the boss, that is, before step S820, the following steps are also included:

[0100] Step S826: Securely connect the connecting rod to the crank ring.

[0101] It is understood that in other embodiments, the connecting rod may also be separated from the crank ring in step S820. In this case, the following steps are further included between step S820 and step S830, or after step S830:

[0102] The connecting rod is fixedly connected to the crank ring.

[0103] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A piston connecting rod device, characterized in that, include: A piston having a piston head and a piston skirt, wherein the piston skirt has a welding clearance hole that connects the inside and outside of the piston; A boss is located inside the piston skirt and is provided on the piston head; Ball head; A cover plate is fitted over the boss, such that the ball head is positioned between the cover plate and the boss. The cover plate and the boss are fixed together by laser penetration welding through the welding clearance hole. The connecting rod passes through the cover plate and connects to the ball head; The welding clearance holes are multiple, and the multiple welding clearance holes are arranged at intervals along the circumference of the piston skirt. There are multiple welding points between the cover plate and the boss, and the multiple welding points are set one-to-one with the multiple welding clearance holes. The cover plate is provided with anti-expansion and contraction through holes, which are located on the side of the welding point away from the piston head. Each welding point is provided with at least one anti-expansion and contraction through hole. The ball head is located within the limiting space formed by the cover plate and the boss, and the anti-expansion and contraction through hole connects the limiting space and the piston skirt; The cover plate includes a surrounding part, a connecting part, and a limiting part connected in sequence. The surrounding part is sleeved outside the boss. The welding point is located between the surrounding part and the boss. The ball head is located between the limiting part and the boss. The anti-expansion and contraction through hole is located on the connecting part. The anti-expansion through hole extends to the connection between the connecting part and the surrounding part.

2. The piston connecting rod device as described in claim 1, characterized in that, The boss is integrally formed with the piston.

3. The piston connecting rod device as described in claim 1, characterized in that, The boss is coaxially arranged with the piston skirt.

4. The piston connecting rod device as described in claim 3, characterized in that, The boss is cylindrical, and the cover plate has a surrounding portion that is fitted around the boss. The welding point is located between the surrounding portion and the boss, and the surrounding portion is cylindrical.

5. The piston connecting rod device as described in claim 1, characterized in that, The boss has a first groove, the cover plate has a second groove, and the ball head is located within the limiting space formed by the first groove and the second groove; The inner wall of the first groove has a first spherical surface that fits against the ball head, and the inner wall of the second groove has a second spherical surface that fits against the ball head; and / or In the axial direction of the piston skirt, the depth of the first groove is greater than the depth of the second groove.

6. The piston connecting rod device as described in claim 1, characterized in that, The ball head is located within the limiting space formed by the cover plate and the boss, and the boss has an oil hole that connects the limiting space and the piston skirt.

7. The piston connecting rod device as described in claim 6, characterized in that, The axis of the oil hole is perpendicular to the axis of the boss.

8. The piston connecting rod device as described in claim 1, characterized in that, An oil reservoir is provided on the outer wall of the piston skirt, and the oil reservoir is independent of the welding clearance hole.

9. The piston connecting rod device as described in claim 8, characterized in that, The oil reservoir extends circumferentially around the piston skirt; and / or The oil reservoir is located between the weld clearance hole and the piston head.

10. The piston connecting rod device as claimed in claim 1, characterized in that, The ball head has a first mounting hole, the connecting rod has a first welding surface and a first insertion portion protruding from the first welding surface, the first insertion portion is inserted into the first mounting hole, and the first welding surface is welded to the outer surface of the ball head; and / or The piston connecting rod assembly further includes a crank ring, the crank ring having a second mounting hole, the connecting rod having a second welding surface and a second insertion portion protruding from the second welding surface, the second insertion portion being inserted into the second mounting hole, and the second welding surface being welded to the outer surface of the crank ring.

11. A method for assembling a piston connecting rod assembly, applied to the piston connecting rod assembly as described in any one of claims 1 to 10, characterized in that, The assembly method of the piston connecting rod device includes the following steps: The cover plate is fitted over the boss, such that the ball head is confined between the cover plate and the boss, wherein the boss is located within the piston skirt of the piston and is located on the piston head of the piston; and The boss and cover plate are fixed by laser penetration welding through a welding clearance hole. The welding clearance hole is located on the piston skirt and connects the inside and outside of the piston.

12. The assembly method of the piston connecting rod device as described in claim 11, characterized in that, Before the step of fitting the cover plate over the boss and limiting the ball head to between the cover plate and the boss, the following step is also included: Place the piston on the mounting platform with the piston skirt positioned above the piston head.

13. The assembly method of the piston connecting rod device as described in claim 12, characterized in that, In the step of fixing the boss and the cover plate by laser penetration welding through the welding clearance hole, the ball head is fixedly connected to the connecting rod, and the cover plate is inserted through the connecting rod.

14. A compressor, characterized in that, Includes the piston connecting rod assembly as described in any one of claims 1-10.

15. A refrigeration device, characterized in that, Includes the compressor as described in claim 14.

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