Novel large-diameter piston component of reciprocating compressor

Abstract

The utility model relates to the technical field of compressors, and particularly discloses a novel large-diameter piston component of a reciprocating compressor. A main body structure of the piston consists of a shaft side piston body and a cover side piston body which are connected through matching of a positioning seam allowance. The shaft side piston body comprises a shaft side core shaft, an end plate, an outer ring, a rib plate and a hoisting screw hole, and the cover side piston body comprises a cover side core shaft, an end plate, an outer ring, a rib plate and a hoisting screw hole. And the piston component is accurately positioned through the matched installation of the cover side positioning spigot and the shaft side positioning spigot. The piston body is fixed through welding, and connection is ensured through a full-welding double-face fillet weld and an inverted-groove annular weld. After welding, the welding quality is detected by ultrasonic waves so as to ensure that the welding quality meets the standard requirement. The piston component has the effects of being simple in structure, convenient and fast to manufacture, accurate in positioning, firm in structure and controllable in welding quality, and the performance and stability of the reciprocating compressor can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a new large-diameter piston component for a reciprocating compressor. Background Art

[0002] The piston assembly is the core component of the reciprocating compressor. It and the cylinder constitute the working volume of the compressor. Therefore, in addition to good sealing, the piston assembly must also have sufficient strength and rigidity. The connection and positioning of the piston and piston rod must also be reliable. The overall component must be light in weight and must meet the requirements of the reciprocating inertia force. The specific pressure must be small and the service life of the seal must be long. It must also have good manufacturing processability.

[0003] Most compressor manufacturers now use cast or forged pistons to meet the requirements of strength and rigidity. However, some large-diameter pistons use cast or forged pistons due to their large diameter, which results in the piston weight not being able to be reduced. The reciprocating inertia force of the entire unit is large, the bearing pressure ratio is large, and the equipment operation is not stable enough, which affects the use. In addition, large-diameter aluminum alloy pistons cannot meet the use of some processes that are corrosive to aluminum. In order to solve this problem, some manufacturers have adopted the structure of welded pistons. Generally, welded pistons use an integral structure. Due to the limitations of the overall design structure, the welding process has certain defects, resulting in the internal reinforcing rib plate and the piston end face or the piston outer ring. There is always a part that cannot be welded. Under the same conditions, the strength and rigidity of the piston will be weakened, and the piston body will be damaged.

[0004] In the patent "Large Diameter Piston for Piston Compressor" (publication number CN212337572U, hereinafter referred to as prior art 1), a two-half or three-half piston is disclosed, in which the piston is divided into several parts for assembly and installation; in the two-half type, the center of the piston nut is used for fastening connection, and the fastening bolts are arranged on the outer ring of the connection between the two halves of the piston; the bolts are arranged in a whole circle, which is inconvenient for installation and disassembly, and the coaxiality of such installation is not high; and the strength of the bolts is limited, and they are easily damaged and cause losses under severe working conditions. Utility Model Content

[0005] In view of this, an embodiment of the utility model provides a new large-diameter piston component for a reciprocating compressor, which is used to solve the problems that the conventional cast or forged pistons are heavy, the large-diameter aluminum alloy pistons cannot meet the needs of some processes that are corrosive to aluminum, and the welding process of the integrally welded pistons is poor.

[0006] In the first aspect, the embodiment of the utility model provides a new large-diameter piston component of a reciprocating compressor, including a piston body, wherein the piston body is composed of a shaft-side piston body and a cover-side piston body; a side of the shaft-side piston body connected to the cover-side piston body is respectively provided with a shaft-side positioning stop and a cover-side positioning stop; the shaft-side piston body and the cover-side piston body are engaged by the cooperation of the shaft-side positioning stop and the cover-side positioning stop; the shaft-side piston body includes a shaft-side core shaft, a shaft-side end plate, a shaft-side outer ring and a shaft-side rib plate; the shaft-side rib plate and The shaft side core shaft, the shaft side end plate and the shaft side outer ring are fixed by welding; the cover side piston body includes the cover side core shaft, the cover side end plate, the cover side outer ring and the cover side rib plate; the cover side rib plate and the cover side core shaft, the cover side end plate and the cover side outer ring are fixed by welding; the welding connections are all arranged with chamfered annular welds; the shaft side piston body and the cover side piston body are fixed by piston rods arranged in the shaft side core shaft and the cover side core shaft; the piston rod locks the shaft side piston body and the cover side piston body with the piston rod through the cover side locking nut.

[0007] Preferably, the shaft side positioning stop and the cover side positioning stop are respectively arranged coaxially with the shaft side piston body and the cover side piston body; the inner shape of the shaft side positioning stop is adapted to the outer shape of the cover side positioning stop; the shaft side piston body and the cover side piston body are positioned by the engagement of the cover side positioning stop with the shaft side positioning stop.

[0008] Preferably, the shaft side piston body is provided with a shaft side clasp; the cover side piston body is provided with a cover side clasp; the shaft side clasp and the cover side clasp are respectively provided with shaft side lifting screw holes and cover side lifting screw holes; the shaft side clasp is welded to the shaft side end plate; the cover side clasp is welded to the cover side end plate.

[0009] The outer surface of the shaft-side outer ring is provided with at least a pair of shaft-side supporting rings; the outer surface of the cover-side outer ring is provided with at least a pair of cover-side supporting rings and a piston ring; the shaft-side supporting ring is cooperatively connected with the outer surface of the shaft-side outer ring; the cover-side supporting ring is cooperatively connected with the outer surface of the cover-side outer ring; the shaft-side outer ring and the cover-side outer ring are both provided with the piston ring.

[0010] Preferably, the shaft side core shaft is set with a countersunk hole and includes a first shaft side ring and a second shaft side ring; the shaft side ribs are arranged with a plurality of blocks around the outer rings of the first shaft side ring and the second shaft side ring at uniform intervals, and a plurality of the shaft side ribs are provided with rib plate through holes for weight reduction; the shaft side end plate is arranged at the end of the first shaft side ring away from the second shaft side ring.

[0011] Preferably, the cover side core shaft is arranged in a countersunk hole and comprises a first cover side ring and a second cover side ring.

[0012] Preferably, the shaft side piston body also includes a shaft side rib plate; the cover side piston body also includes a cover side rib plate; the shaft side rib plate is connected to the shaft side end plate, the shaft side core shaft, and the shaft side outer ring by welding and is fully welded with double-sided fillet welds or circumferential welds; the cover side rib plate is fixedly connected to the cover side end plate, the cover side core shaft, and the cover side outer ring by welding and is fully welded with double-sided fillet welds or circumferential welds.

[0013] Preferably, the shaft side positioning stop and the cover side positioning stop are respectively arranged as protrusions and depressions on the outer rings of the shaft side piston body and the cover side piston body; the shaft side positioning stop and the cover side positioning stop are engaged and positioned by the protrusions and depressions.

[0014] Preferably, the cover side piston body and the shaft side piston body are assembled and fixed at the cover side positioning stop and the shaft side positioning stop; after the cover side positioning stop and the shaft side positioning stop are matched, the combined end faces are set without gap; after the cover side piston body and the shaft side piston body are installed through the matching of the cover side positioning stop and the shaft side positioning stop, a spacing distance is provided between the shaft side rib plate and the cover side rib plate.

[0015] Preferably, the shaft-side end plate and the cover-side end plate are both provided with end plate axial holes which are coaxial with and penetrate the shaft-side core shaft and the cover-side core shaft respectively.

[0016] The utility model provides a new large-diameter piston component for a reciprocating compressor, which has the following beneficial effects:

[0017] This piston body optimizes the structure of the piston components. The piston body adopts a combined welding structure, which consists of a shaft side piston body and a cover side piston body. It is fixed after being positioned by the shaft side positioning stop and the cover side positioning stop. Due to the weight limitation of the large diameter piston body, the combined welding piston structure can reduce the weight and reduce the reciprocating inertia force. The combined welding piston body structure has good welding technology. The rib plate and the end plate, the mandrel and the outer ring can be welded in all directions, and there will be no dead angles that cannot be covered by welding. Ensure the overall strength and rigidity of the piston body. If the aging treatment is not perfect during the manufacturing process, the combined welding piston body can compensate for the later stress release to the maximum extent compared with the integral welding piston body, avoiding the deformation of the piston body or even the tearing of the weld. Through the welding between the mandrel and the end plate, the end plate and the outer ring, and the chamfered annular weld, the strength is high and the welding quality is improved: the design of the chamfered annular weld can promote the full melting and penetration of the welding material, improve the welding quality, and reduce the generation of welding defects. Ensure the overall strength and rigidity of the piston body, so that it can achieve the best working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for use in the embodiment of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the utility model.

[0019] Figure 1 It is a schematic diagram of the internal structure of a new large-diameter piston component of a reciprocating compressor before assembly;

[0020] Figure 2 It is a schematic diagram of the internal structure of a combination of a new type of large-diameter piston component of a reciprocating compressor;

[0021] Figure 3 It is a schematic diagram of the internal structure of a reciprocating compressor after the assembly of a new type of large-diameter piston component;

[0022] Figure 4 It is a schematic diagram of the assembly of some internal components of a new large-diameter piston component of a reciprocating compressor;

[0023] Figure 5 It is a schematic diagram of a cover side mandrel and a shaft side mandrel of a new large diameter piston component of a reciprocating compressor;

[0024] Parts and numbers in the figure: 1-piston body, 11-axle side piston body, 12-axle side positioning stop, 111-axle side mandrel, 112-axle side end plate, 113-axle side outer ring, 114-axle side rib plate, 115-axle side lifting screw hole, 116-first shaft side ring, 117-second shaft side ring, 118-rib plate through hole, 119-end plate shaft hole, 21-cover side piston body, 22-cover side positioning stop , 211-cover side core shaft, 212-cover side end plate, 213-cover side outer ring, 214-cover side rib plate, 215-cover side lifting screw hole, 216-first cover side ring, 217-second cover side ring, 311-shaft side bracket, 312-cover side bracket, 321-shaft side supporting ring, 322-cover side supporting ring, 33-piston ring, 34-piston rod, 35-shaft side locking nut, 36-cover side locking nut. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model. Moreover, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the embodiments of the utility model and the various features in the embodiments can be combined with each other, all within the scope of protection of the utility model.

[0026] Example 1

[0027] See also Figure 1 and Figure 2, an embodiment of the utility model provides a new large-diameter piston component for a reciprocating compressor, and a large-diameter piston body refers to a piston with a larger diameter used in an internal combustion engine or other hydraulic system. A piston is a cylindrical part, usually made of metal, which moves in a cylinder to compress gas or liquid, thereby working or pushing other mechanical parts. A piston body with a larger diameter can provide greater thrust or higher compression efficiency, and is suitable for application scenarios that require higher performance. The size of the large-diameter piston body will vary depending on the application. In an internal combustion engine or hydraulic system, the diameter of the large-diameter piston body may be between a few centimeters and tens of centimeters, depending on the design requirements of the engine or system. For example, a large diesel engine may use a piston body with a diameter of more than 30 centimeters, which is a large-diameter piston body, while a small gasoline engine may only be a few centimeters. The actual size may vary depending on the specific design and application. The piston component includes a piston body 1, which is formed by welding and fixing the shaft side piston body 11 and the cover side piston body 21 on the outer surface after one end is joined; the shaft side piston body 11 and the cover side piston body 21 are respectively provided with a shaft side positioning stop 12 and a cover side positioning stop 22 on the side where they meet; the shaft side positioning stop 12 and the cover side positioning stop 22 are respectively provided on the shaft side piston body 11 and the cover side piston body 21 in the form of a convex and concave arrangement. Figure 5 The shaft side piston body 11 and the cover side piston body 21 are fixed by a piston rod 34 arranged in the shaft side core shaft 111 and the cover side core shaft 211; the two ends of the piston rod 34 are locked by a shaft side locking nut 35 and a cover side locking nut 36 respectively.

[0028] See also Figure 5The shaft side piston body 11 and the cover side piston body 21 respectively include a shaft side mandrel 111, a shaft side end plate 112, a shaft side outer ring 113, a shaft side rib plate 114 and a cover side mandrel 211, a cover side end plate 212, a cover side outer ring 213, and a cover side rib plate 214; the shaft side rib plate 114 is welded to the shaft side mandrel 111, the shaft side end plate 112, and the shaft side outer ring 113 when the shaft side piston body 11 is separated from the cover side piston body 21; the cover side rib plate 214 is welded to the cover side mandrel 211, the cover side end plate 212, and the cover side outer ring 213 when the shaft side piston body 11 is separated from the cover side piston body 21; the welding connection adopts a full-weld double-sided fillet weld. A full-weld double-sided fillet weld is a double-sided weld formed at the intersection of two workpieces, and the weld presents a shape similar to an angle, with a certain width and height. Full-weld double-sided fillet welds have high strength. Due to the design of the weld shape, full-weld double-sided fillet welds can provide higher welding strength and are suitable for parts that need to withstand a certain load or pressure. Full-weld double-sided fillet welds have good aesthetics: The appearance of full-weld double-sided fillet welds is neat, which can improve the aesthetics of the welded parts and is suitable for occasions with high requirements for appearance.

[0029] See also Figure 4 During assembly welding, first spot weld the mandrel, end plate, outer ring, and rib plate to each other, then weld the rib plate to the end plate, the rib plate to the outer ring of the mandrel, and the rib plate to the inner surface of the outer ring in turn, using full-weld double-sided fillet welds. The rib plates are provided with preset intervals. Generally, an even number of rib plates such as six or eight are provided. Finally, weld the mandrel to the end plate, and the outer ring to the end plate, using a circumferential weld to the groove. The cover side positioning stop 22 is embedded in the shaft side positioning stop 12 to complete the positioning and embedded installation. After embedded installation, the shaft side or cover side is welded. The shaft side piston body 11 and the cover side piston body 21 are positioned and installed by the engagement of the cover side positioning stop 22 with the shaft side positioning stop 12.

[0030] Please attend Figure 3 The cover side piston body 21 and the shaft side piston body 11 are positioned by positioning stoppers on the outer surfaces of the cover side positioning stoppers 22 and the shaft side positioning stoppers 12, the inner hole of the shaft side piston body 11 is connected to the convex shoulder of the piston rod 34, and the cover side locking nut 36 is combined with the two ends of the piston rod 34. The matching end faces of the cover side positioning stoppers 22 and the shaft side positioning stoppers 12 are arranged without gaps; the outer ring end faces of the piston body 1 are better contacted by the shaft side positioning stoppers 12 and the cover side positioning stoppers 22 for positioning, and no gaps will appear, and the two piston bodies 1 are not easily deformed during operation; after the cover side piston body 21 and the shaft side piston body 11 are installed by matching the cover side positioning stoppers 22 and the shaft side positioning stoppers 121, a spacing distance is set between several rib plates.

[0031] See also Figure 3The outer surface of the shaft side outer ring 113 is provided with at least one pair of shaft side support rings 321; the outer surface of the cover side outer ring 213 is provided with at least one pair of cover side support rings 322; the shaft side support rings 321 and the cover side support rings 322 are both seals, and the seals also include piston rings 33. The shaft side support rings 321, the cover side support rings 322 and the piston rings 33 are all seals. The shaft side support rings 321, the cover side support rings 322 and the piston rings 33 are not welded and fixed to the piston body 1, but are assembled; the shaft side support rings 321, the cover side support rings 322 and the piston rings 33 are open plastic parts. The shaft side positioning stop 12 and the cover side positioning stop 22 are respectively arranged coaxially with the shaft side piston body 11 and the cover side piston body 21; the inner shape of the shaft side positioning stop 12 is adapted to the outer shape of the cover side positioning stop 22; during installation, since the shaft side piston body 11 and the cover side piston body 21 are both arranged coaxially, it is only necessary to engage the shaft side positioning stop 12 and the cover side positioning stop 22; in this way, the outer ring end face contact of the piston body 1 is better, no gap will appear during welding, and the two piston bodies are not easily deformed during operation; the cover side positioning stop 22 is embedded in the shaft side positioning stop 12 to complete the positioning; the shaft side piston body 11 and the cover side piston body 21 Positioning and installation are performed by engaging the cover side positioning stop 22 with the shaft side positioning stop 12; a new type of large diameter piston structure, the piston body 1 adopts a combined structure, which is assembled by the shaft side piston body 11 and the cover side piston body 21 through stop positioning, and this structure allows the ribs and internal components of the shaft side piston body 11 and the cover side piston body 21 to be welded in place; the conventional integral structure adopts a deep welding depth, and it is impossible to perform qualified welding on the components deep at its end, which will reduce the life of the piston components; the combined structure also solves the problem of heavy weight of the piston when the piston body 1 is cast or forged, and the problem of poor welding process of the integrally welded piston. After welding, ultrasonic testing is used to detect the quality of the weld, and then the piston is heat-treated and annealed as a whole to remove welding stress.

[0032] See also Figure 1 and Figure 2The shaft side piston body 11 includes a shaft side mandrel 111, a shaft side end plate 112, a shaft side outer ring 113, a shaft side rib plate 114, and a shaft side bracket 311; a shaft side lifting screw hole 115 is provided on the shaft side bracket 311; the shaft side bracket 311 and the shaft side end plate 112 are assembled and welded. The cover side piston body 21 includes a cover side mandrel 211, a cover side end plate 212, a cover side outer ring 213, a cover side rib plate 214, and a cover side bracket 312; a cover side lifting screw hole 215 is provided on the cover side bracket 312; the cover side bracket 312 and the cover side end plate 212 are assembled and welded. When the lifting screw hole is used, an internal threaded hole is processed on the bracket, and the bracket is welded to the end plate. The shaft side core shaft 111 is set in a countersunk hole and includes a first shaft side ring 116 and a second shaft side ring 117; the shaft side ribs 114 are arranged around the outer rings of the first shaft side rings 116 and the second shaft side rings 117 at uniform intervals, and the shaft side ribs 114 are provided with rib through holes 118; the shaft side end plate 112 is arranged at the end of the first shaft side ring 116 away from the second shaft side ring 117; the cover side core shaft 211 is also set in a countersunk hole and includes a first cover side ring 216 and a second cover side ring 217; a number of evenly distributed shaft side ribs 114 and cover side ribs 214 ensure the rigidity of the piston body 1, and at the same time strengthen the strength of the shaft side end plate 112 and the cover side end plate 212 that are subjected to the greatest force; the outer ring of the piston body 1 is also provided with a number of grooves of different depths and widths for arranging the supporting rings and piston rings 33 of the piston components.

[0033] The shaft side core shaft 111 and the cover side core shaft 211 are made of low alloy high strength structural steel Q345, the shaft side end plate 112 and the cover side end plate 212 and the shaft side outer ring 113 and the cover side outer ring 213 are all made of Q345R steel plate used for boilers and pressure vessels, the shaft side rib plate 114, the cover side rib plate 214, the shaft side bracket 311 and the cover side bracket 312 are made of Q235B steel plate, so as to reduce the weight of the piston body 1 while ensuring the strength and rigidity of the piston body 1; the shaft side core shaft 111 and the cover side core shaft 211 are forgings, and the shaft side end plate 112 and the cover side end plate 212 and the shaft side outer ring 113 and the cover side outer ring 213 are made of rolled steel plates in normalized state.

[0034] Preferably, the shaft side rib plate 114 and the shaft side end plate 112, the shaft side mandrel 111, the shaft side outer ring 113 and the cover side rib plate 214 and the cover side end plate 212, the cover side mandrel 211, and the cover side outer ring 213 are all fully welded with double-sided fillet welds. The shaft side end plate 112 and the shaft side mandrel 111, the shaft side end plate 112 and the shaft side mandrel 111 and the cover side end plate 212 and the cover side mandrel 211, and the outer ring of the cover side end plate 212 and the cover side mandrel 211 are all set with a chamfered annular weld. A chamfered annular weld is an annular weld formed at the junction of two workpieces, in which the edge of one side of the workpiece is cut into a slope to form an annular groove. A chamfered annular weld can improve the welding quality, and the design of the chamfered annular weld can promote the full melting and penetration of the welding material, improve the welding quality, and reduce the occurrence of welding defects. A chamfered annular weld can save materials and reduce weight. Due to the design of the beveled annular weld, relatively less filler material is required during welding, which can save material costs.

[0035] Preferably, the cover-side piston body 21 and the shaft-side piston body 11 are fixed by locking the piston rod 34 and the locking nut at the cover-side positioning stop 22 and the shaft-side positioning stop 12; after the cover-side positioning stop 22 and the shaft-side positioning stop 12 are fixed, the outer surfaces are set without gap; the shaft-side positioning stop 12 and the cover-side positioning stop 22 are used for positioning, and the outer ring end faces of the piston body 1 are better in contact without gaps, and the two piston bodies 1 are not easily deformed during operation; after the cover-side piston body 21 and the shaft-side piston body 11 are installed by matching the cover-side positioning stop 22 and the shaft-side positioning stop 12, a spacing distance is provided between the shaft-side rib plate 114 and the cover-side rib plate 214.

[0036] Preferably, the shaft side end plate 112 and the cover side end plate 212 are both provided with an end plate shaft hole 119 which is coaxial with the shaft side core shaft 111 and the cover side and passes through; after the shaft side piston body 11 and the cover side piston body 21 are installed by matching the cover side positioning stop 22 with the shaft side positioning stop 12, ultrasonic testing is used to detect the weld quality of the internal components; after welding, ultrasonic testing is used to detect the weld quality, the whole is heat treated, and annealing is used to remove welding stress.

[0037] Example 2

[0038] See also Figure 1 and Figure 2The embodiment of the utility model provides a new large-diameter piston component for a reciprocating compressor. Due to the weight limitation of the large-diameter piston body 1, the combined welded piston structure can reduce its weight and reduce the reciprocating inertia force; it can also reduce the bearing pressure of the piston body 1, extend the service life of the bearing ring, and ensure the sealing performance of the piston; the combined welded piston body 1 structure can improve its welding process, and all components can be welded in all directions. The overall strength and rigidity of the piston body 1 are ensured; if the aging treatment is not perfect during the manufacturing process, the combined welded piston body 1 can compensate for the later stress release to the maximum extent compared with the integral welded piston body 1, and avoid the deformation of the piston body 1 or even the tearing of the weld; through the selection of materials, the general welded piston adopts ordinary carbon steel plate, which has poor performance and needs to increase the effective thickness of each part to ensure the overall mechanical strength. The product of the utility model adopts low-alloy and high-strength steel, which can not only ensure excellent welding performance, but also reduce the effective thickness of each part, ensure the overall strength while minimizing the weight of the piston, saving manufacturing costs; it has the economy of wide promotion, and this piston component can replace the original cast iron or welded piston under some working conditions that require oil injection, cancel the oil injection, use oil-free lubrication technology, greatly reduce the consumption of equipment lubricating oil, and save operating costs; because the piston body 1 is light in weight, the supporting ring of the piston body 1 is a carbon fiber reinforced material with high value. When the piston support pressure ratio is met, the length of the supporting ring can be shortened to reduce the manufacturing cost of the supporting ring; under the condition of oil-free lubrication, the pressure ratio needs to be guaranteed to be less than 0.3kg / cm 2 within the range.

[0039] Example 3

[0040] See also Figure 1 and Figure 3The embodiment of the utility model provides a new large-diameter piston component for a reciprocating compressor. The new large-diameter piston component for a reciprocating compressor provided by the utility model has the following beneficial effects: the structure of the piston component is optimized, the piston body 1 adopts a combined setting, which is composed of a shaft-side piston body 11 and a cover-side piston body 21, which are positioned by the inner shaft-side positioning stop 12 and the cover-side positioning stop 22 and then installed in coordination; the piston body adopts a combined welded piston body structure, and the welding process can reach a higher standard; the pistons manufactured by most compressor manufacturers today all adopt cast or forged pistons to meet the requirements of strength and rigidity, but some large-diameter pistons, due to the large piston diameter, adopt cast or forged pistons, which leads to the weight of the piston being unable to be reduced, the reciprocating inertia force of the entire unit is large, the bearing specific pressure is large, the equipment operation is not stable enough, and the use is affected, while the large-diameter aluminum alloy piston cannot meet the use of some processes that are corrosive to aluminum. In order to solve this problem, some manufacturers have adopted the structure of welded pistons. Generally, welded pistons adopt an integral structure. Due to the limitations of the overall design structure, the welding process has certain defects, resulting in one part of the internal reinforcing rib plate and the piston end face or the piston outer ring being unable to be welded. Under the same conditions, the strength and rigidity of the piston will be weakened, resulting in damage to the piston body.In the integrally welded structure, the depth of the piston body is relatively deep, and the welding gun cannot achieve complete coverage during welding. Even if the welding gun can cover it, it is impossible to perform a better welding process at a position with a deeper depth; using a combined welded piston body structure, the original components of the piston body 1 are divided into the components of the shaft side piston body 11 and the cover side piston body 21, and then the components of the shaft side piston body 11 and the cover side piston body 21 are welded separately, so that the welding of the components can cover all positions, and there will be no dead angles that cannot be covered by welding, so that the shaft side rib plate 114, the shaft side end plate 112, the shaft side core shaft 111, the shaft side outer ring 113, the cover side rib plate 214, the cover side end plate 212, the cover side core shaft 211 and the cover side outer ring 213 can all be fully welded, so that the overall strength and rigidity of the piston body 1 can be ensured; the use of a welded piston structure can reduce weight and reduce reciprocating inertia The combined welded piston body 1 can reduce the bearing pressure of the piston body 1, extend the service life of the bearing ring of the piston body 1, and ensure the sealing performance of the piston; compared with the integral welded piston body 1, the combined welded piston body 1 can solve the imperfect aging treatment that may exist in the manufacturing process of the piston body 1. In this case, it can compensate for the later stress release to the maximum extent, and avoid the deformation of the piston body 1 or even the tearing of the weld; the various components of the piston body 1 adopt relatively simple design and manufacturing processes, such as welding, which is conducive to reducing production costs and manufacturing cycles; the outer ring of the piston body 1 is fixed by welding, and full-welded double-sided fillet welds and chamfered annular welds are used to ensure the firmness and stability of the welding connection, and improve the durability and reliability of the components; after the outer ring of the piston body 1 is welded, ultrasonic testing of the weld quality is used to ensure that the welding quality meets the standard requirements, further improving the quality and reliability of the piston components. In summary, the piston component design has the advantages of simple structure, convenient manufacturing, precise positioning, firm structure, and controllable welding quality, which can effectively improve the performance and stability of the reciprocating compressor, reduce production costs, and improve product quality.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A new large-diameter piston component for a reciprocating compressor, characterized in that: The piston body (1) comprises a piston body (1) which is composed of a shaft-side piston body (11) and a cover-side piston body (21); a shaft-side positioning stop (12) and a cover-side positioning stop (22) are respectively provided on a surface where the shaft-side piston body (11) and the cover-side piston body (21) are connected; the shaft-side piston body (11) and the cover-side piston body (21) are joined by the cooperation of the shaft-side positioning stop (12) and the cover-side positioning stop (22); The shaft-side piston body (11) comprises a shaft-side core shaft (111), a shaft-side end plate (112), a shaft-side outer ring (113) and a shaft-side rib plate (114); the shaft-side rib plate (114) is fixed to the shaft-side core shaft (111), the shaft-side end plate (112) and the shaft-side outer ring (113) by welding; the cover-side piston body (21) comprises a cover-side core shaft (211), a cover-side end plate (212), a cover-side outer ring (213) and a cover-side rib plate (214); the cover-side rib plate (214) is fixed to the cover-side core shaft (211), the cover-side end plate (212) and the cover-side outer ring (213) by welding; the welding connections are all arranged by a chamfered annular weld; The shaft-side piston body (11) and the cover-side piston body (21) are fixed by a piston rod (34) disposed in the shaft-side core shaft (111) and the cover-side core shaft (211); the piston rod (34) locks the shaft-side piston body (11) and the cover-side piston body (21) with the piston rod (34) via a cover-side locking nut (36).

2. A new large-diameter piston component for a reciprocating compressor according to claim 1, characterized in that: The shaft side positioning stop (12) and the cover side positioning stop (22) are respectively arranged coaxially with the shaft side piston body (11) and the cover side piston body (21); the inner shape of the shaft side positioning stop (12) is matched with the outer shape of the cover side positioning stop (22); the shaft side piston body (11) and the cover side piston body (21) are positioned by the engagement of the cover side positioning stop (22) with the shaft side positioning stop (12).

3. A new large-diameter piston component for a reciprocating compressor according to claim 1, characterized in that: The shaft-side piston body (11) is provided with a shaft-side bracket (311); the cover-side piston body (21) is provided with a cover-side bracket (312); the shaft-side bracket (311) and the cover-side bracket (312) are respectively provided with shaft-side lifting screw holes (115) and cover-side lifting screw holes (215); the shaft-side bracket (311) is welded to the shaft-side end plate (112); and the cover-side bracket (312) is welded to the cover-side end plate (212).

4. A new large-diameter piston component for a reciprocating compressor according to claim 1, characterized in that: The outer surface of the shaft-side outer ring (113) is provided with at least a pair of shaft-side support rings (321); the outer surface of the cover-side outer ring (213) is provided with at least a pair of cover-side support rings (322) and a piston ring (33); the shaft-side support ring (321) is cooperatively connected with the outer surface of the shaft-side outer ring (113); the cover-side support ring (322) is cooperatively connected with the outer surface of the cover-side outer ring (213); the shaft-side outer ring (113) and the cover-side outer ring (213) are both provided with the piston ring (33).

5. A new large-diameter piston component for a reciprocating compressor according to claim 3, characterized in that: The shaft side core shaft (111) is arranged in a countersunk hole and includes a first shaft side ring (116) and a second shaft side ring (117); a plurality of shaft side rib plates (114) are arranged around the outer rings of the first shaft side ring (116) and the second shaft side ring (117) at uniform intervals, and a plurality of shaft side rib plates (114) are provided with rib plate through holes (118) for weight reduction; and the shaft side end plate (112) is arranged at the end of the first shaft side ring (116) away from the second shaft side ring (117).

6. A new large-diameter piston component for a reciprocating compressor according to claim 4, characterized in that: The cover side core shaft (211) is arranged in the form of a countersunk hole and comprises a first cover side ring (216) and a second cover side ring (217).

7. A new large-diameter piston component for a reciprocating compressor according to any one of claims 2 to 4, characterized in that: The shaft-side piston body (11) further comprises a shaft-side rib plate (114); the cover-side piston body (21) further comprises a cover-side rib plate (214); the shaft-side rib plate (114) is connected to the shaft-side end plate (112), the shaft-side core shaft (111), and the shaft-side outer ring (113) by welding and using full-welded double-sided fillet welds or girth welds; the cover-side rib plate (214) is connected to the cover-side end plate (212), the cover-side core shaft (211), and the cover-side outer ring (213) by welding and using full-welded double-sided fillet welds or girth welds.

8. A new large-diameter piston component for a reciprocating compressor according to claim 1, characterized in that: The shaft side positioning stop (12) and the cover side positioning stop (22) are respectively arranged in the form of a protrusion and a depression on the outer ring of the shaft side piston body (11) and the outer ring of the cover side piston body (21); the shaft side positioning stop (12) and the cover side positioning stop (22) are engaged and positioned via the protrusion and the depression.

9. A new large-diameter piston component for a reciprocating compressor according to claim 4, characterized in that: The cover side piston body (21) and the shaft side piston body (11) are assembled and fixed at the cover side positioning stop (22) and the shaft side positioning stop (12); after the cover side positioning stop (22) and the shaft side positioning stop (12) are matched, the combined end surfaces are arranged without gap; after the cover side piston body (21) and the shaft side piston body (11) are installed through the matching of the cover side positioning stop (22) and the shaft side positioning stop (12), a spacing distance is provided between the shaft side rib plate (114) and the cover side rib plate (214).

10. A new large-diameter piston component for a reciprocating compressor according to claim 4, characterized in that: The shaft-side end plate (112) and the cover-side end plate (212) are both provided with end plate shaft holes (119) which are coaxial with and penetrate the shaft-side core shaft (111) and the cover-side core shaft (211), respectively.

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