CN222296444U - A new large-diameter piston component for reciprocating compressors - Google Patents

Abstract

The utility model relates to the technical field of compressors, in particular to a large-diameter novel piston part of a reciprocating compressor. The shaft-side piston body comprises a shaft-side mandrel, an end plate, an outer ring, a rib plate and a hoisting screw hole, and the cover-side piston body comprises a cover-side mandrel, an end plate, an outer ring, a rib plate and a hoisting screw hole. The matched installation of the cover side locating spigot and the shaft side locating spigot enables the piston component to be accurately located. The piston main body is fixed by welding, and the connection is ensured by adopting full-welded double-sided fillet welds and inverted slope annular welds. After welding, ultrasonic wave is adopted to detect the quality of the welding seam so as to ensure that the welding quality meets the standard requirement. The piston component has the effects of simple structure, convenience in manufacturing, accurate positioning, firm structure and controllable welding quality, and can effectively improve the performance and stability of the reciprocating compressor.

Description

Large-diameter novel piston component of reciprocating compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a novel large-diameter piston component of a reciprocating compressor.

Background

The piston component is a core component of the reciprocating compressor, and forms the working volume of the compressor with the cylinder, so that the piston component needs to have good sealing performance, enough strength and rigidity, reliable connection and positioning of the piston and the piston rod, light weight of the whole component, meeting the requirement of reciprocating inertia force, small specific pressure, long service life of the sealing element and good manufacturing manufacturability.

Most compressor manufacturers manufacture pistons at present, casting or forging pistons are adopted to meet the requirements of strength and rigidity, but because of the large diameter pistons and the large diameter pistons, the casting or forging pistons are adopted to cause the weight of the pistons to be unable to fall down, the reciprocating inertial force of the whole unit is large, the bearing specific pressure is large, the equipment operation is not stable enough, the use is affected, and the large diameter aluminum alloy pistons cannot meet the process of corrosion to aluminum. In order to solve the problem, some manufacturers have adopted the structure of welding pistons, and general welding pistons adopt an integral structure, and because of the limitation of the integral design structure, the welding process has certain defects, so that the inner reinforcing rib plate and the end face of the piston or the outer ring of the piston can not be welded all the time, the strength and the rigidity of the piston can be weakened under the same condition, and the piston body is damaged.

In the patent of 'piston compressor large diameter piston' (publication No. CN212337572U, hereinafter referred to as prior art 1), a piston capable of being divided into two halves and three halves is disclosed, the piston is assembled by dividing into several parts, the centers of the piston nuts are used for fastening connection in two halves, the fastening bolt is arranged on the outer ring of the joint of the two halves, the bolt is arranged for a whole circle, the assembly and the disassembly are inconvenient, the coaxiality of the assembly is not high, the strength of the bolt is limited, and the bolt is extremely easy to damage under severe working conditions, thereby causing loss.

Disclosure of utility model

In view of the above, the embodiment of the utility model provides a large-diameter novel piston component of a reciprocating compressor, which is used for solving the problems that the conventional casting or forging piston is heavy, and a large-diameter aluminum alloy piston cannot meet the process of partially corroding aluminum and the welding process of an integral welding piston is poor.

The embodiment of the utility model provides a large-diameter novel piston part of a reciprocating compressor, which comprises a piston body, wherein the piston body consists of a shaft-side piston body and a cover-side piston body, a shaft-side positioning spigot and a cover-side positioning spigot are respectively arranged on the surface, which is connected with the cover-side piston body, of the shaft-side piston body, the shaft-side piston body and the cover-side piston body are connected through matching of the shaft-side positioning spigot and the cover-side positioning spigot, the shaft-side piston body comprises a shaft-side mandrel, a shaft-side end plate, a shaft-side outer ring and a shaft-side rib plate, the shaft-side rib plate is fixed with the shaft-side mandrel, the shaft-side end plate and the shaft-side outer ring through welding, the cover-side piston body comprises a cover-side mandrel, a cover-side end plate, a cover-side outer ring and a cover-side rib plate, the cover-side rib plate is fixed with the cover-side mandrel and the cover-side outer ring through welding, the shaft-side piston body is fixed with the shaft-side mandrel and the cover-side piston rod through matching of the shaft-side mandrel, and the piston rod is locked with a piston rod through a cover-side locking nut.

Preferably, the shaft side positioning spigot and the cover side positioning spigot are coaxially arranged with the shaft side piston body and the cover side piston body respectively, the inner shape of the shaft side positioning spigot is matched with the outer shape of the cover side positioning spigot, and the shaft side piston body and the cover side piston body are positioned through the joint of the cover side positioning spigot and the shaft side positioning spigot.

The shaft-side piston body is provided with a shaft-side lug, the cover-side piston body is provided with a cover-side lug, the shaft-side lug and the cover-side lug are respectively provided with a shaft-side hoisting screw hole and a cover-side hoisting screw hole, the shaft-side lug is welded on the shaft-side end plate, and the cover-side lug is welded on the cover-side end plate.

The outer surface of the shaft side outer ring is provided with at least one pair of shaft side supporting rings, the outer surface of the cover side outer ring is provided with at least one pair of cover side supporting rings and piston rings, the shaft side supporting rings are connected with the outer surface of the shaft side outer ring in a matched mode, the cover side supporting rings are connected with the outer surface of the cover side outer ring in a matched mode, and the piston rings are arranged on the shaft side outer ring and the cover side outer ring.

The shaft side mandrel is provided with a counter bore and comprises a first shaft side ring and a second shaft side ring, a plurality of shaft side rib plates are arranged around the outer rings of the first shaft side ring and the second shaft side ring at uniform intervals, rib plate through holes are formed in the shaft side rib plates for weight reduction, and the shaft side end plate is arranged at the end part of the first shaft side ring far away from the direction of the second shaft side ring.

Preferably, the cover side mandrel is a counter bore and includes a first cover side ring and a second cover side ring.

The shaft-side piston body further comprises a shaft-side rib plate, the cover-side piston body further comprises a cover-side rib plate, the shaft-side rib plate is in welded connection with the shaft-side end plate, the shaft-side mandrel and the shaft-side outer ring and adopts full-welded double-sided fillet weld or girth weld, and the cover-side rib plate is in welded and fixed connection with the cover-side end plate, the cover-side mandrel and the cover-side outer ring and adopts full-welded double-sided fillet weld or girth weld.

Preferably, the shaft side positioning spigot and the cover side positioning spigot are respectively arranged in a convex and concave mode on the outer ring of the shaft side piston body and the outer ring of the cover side piston body, and the shaft side positioning spigot and the cover side positioning spigot are engaged and positioned through the convex and concave mode.

The cover-side piston body and the shaft-side piston body are assembled and fixed through the cover-side positioning spigot and the shaft-side positioning spigot, the joint end faces are arranged in a gapless mode after the cover-side positioning spigot is matched with the shaft-side positioning spigot, and an interval distance is arranged between the shaft-side rib plates and the cover-side rib plates after the cover-side piston body and the shaft-side piston body are assembled and installed through the cover-side positioning spigot and the shaft-side positioning spigot.

Preferably, the shaft-side end plate and the cover-side end plate are respectively provided with an end plate shaft hole which is coaxial with and penetrates through the shaft-side mandrel and the cover-side mandrel.

The large-diameter novel piston component of the reciprocating compressor has the following beneficial effects:

The piston body optimizes the structure of the piston part, and the piston body is arranged by adopting a combined welding structure and consists of a shaft-side piston body and a cover-side piston body, and is fixed after being positioned by a shaft-side positioning spigot and a cover-side positioning spigot. The large-diameter piston body can reduce weight and reciprocating inertial force due to weight limitation by adopting a combined welding piston structure. The combined welding piston body structure has good welding process, and the rib plates, the end plates, the mandrel and the outer ring can be welded in all directions, so that dead angles which cannot be covered and welded are avoided. The integral strength and rigidity of the piston body are ensured. If ageing treatment is imperfect in the manufacturing process, the combined welding type piston body can compensate the later-stage stress release to the greatest extent compared with the integral welding piston body, and deformation of the piston body and even tearing of welding seams are avoided. The mandrel and the end plate are welded with the outer ring, and the inverted slope mouth annular welding seam is adopted, so that the strength is high, the welding quality is improved, the design of the inverted slope mouth annular welding seam can promote the full melting and penetration of welding materials, the welding quality is improved, and the occurrence of welding defects is reduced. The integral strength and rigidity of the piston body are ensured, so that the piston body can achieve the best working performance.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model will be briefly described, and it is within the scope of the present utility model to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the internal structure of a reciprocating compressor prior to assembly of a large diameter new piston assembly;

FIG. 2 is a schematic diagram of the internal structure of a combination of large diameter novel piston components of a reciprocating compressor;

FIG. 3 is a schematic view of the assembled internal structure of a novel piston assembly of a reciprocating compressor with a large diameter;

FIG. 4 is a schematic diagram of the internal components of a large diameter novel piston component part of a reciprocating compressor;

FIG. 5 is a schematic illustration of a cover side mandrel and a shaft side mandrel of a large diameter novel piston component of a reciprocating compressor;

The parts in the drawing are numbered 1-piston body, 11-shaft side piston body, 12-shaft side locating spigot, 111-shaft side mandrel, 112-shaft side end plate, 113-shaft side outer ring, 114-shaft side rib plate, 115-shaft 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 locating spigot, 211-cover side mandrel, 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 lug, 312-cover side lug, 321-shaft side supporting ring, 322-cover side supporting ring, 33-piston ring, 34-piston rod, 35-shaft side locking nut and 36-cover side locking nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element. If not conflicting, the embodiments of the present utility model and the features of the embodiments may be combined with each other, which are all within the protection scope of the present utility model.

Example 1

Referring to fig. 1 and 2, an embodiment of the present utility model provides a novel piston assembly for a reciprocating compressor, wherein the piston assembly is a piston with a large diameter for use in an internal combustion engine or other hydraulic system. A piston is a cylindrical part, typically made of metal, that moves within a cylinder to compress a gas or liquid to make work or push other mechanical parts. The piston body with larger diameter can provide larger thrust or higher compression efficiency, and is suitable for application scenes needing higher performance. The size of the large diameter piston body may vary from application to 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, in large diesel engines, piston bodies with a diameter exceeding 30 cm, i.e. large diameter piston bodies, may be used, whereas small gasoline engines may only have a diameter of around a few cm. The actual dimensions may vary depending on the particular design and application. The piston part comprises a piston body 1, wherein the piston body 1 is formed by welding and fixing an outer surface of a shaft-side piston body 11 and a cover-side piston body 21 after one end of the shaft-side piston body 11 is connected with the cover-side piston body 21, a shaft-side positioning spigot 12 and a cover-side positioning spigot 22 are respectively arranged on one surface of the shaft-side piston body 11, which is connected with the cover-side piston body 21, and the shaft-side positioning spigot 12 and the cover-side positioning spigot 22 are respectively arranged on the shaft-side piston body 11 and the cover-side piston body 21 in a protruding mode and a recessed mode. Referring to fig. 5, the shaft-side piston body 11 and the cover-side piston body 21 are fixed by a piston rod 34 provided in the shaft-side core shaft 111 and the cover-side core shaft 211, and both ends of the piston rod 34 are locked by a shaft-side lock nut 35 and a cover-side lock nut 36, respectively.

Referring to fig. 5, the 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 114, a cover-side mandrel 211, a cover-side end plate 212, a cover-side outer ring 213, and a cover-side rib 214, wherein the shaft-side rib 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 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, and the welded connection adopts a full-face fillet weld arrangement. A full-welded double-sided fillet weld is a double-sided weld formed at the junction of two workpieces, the weld exhibiting a shape resembling a corner, having a certain width and height. The full-welded double-sided fillet weld has high strength, and can provide higher welding strength due to the design of the shape of the weld, and is suitable for parts needing to bear certain load or pressure. The full-welded double-sided fillet weld has good aesthetic property, the appearance of the full-welded double-sided fillet weld is neat, the aesthetic degree of a welding piece can be improved, and the full-welded double-sided fillet weld is suitable for occasions with higher requirements on appearance.

Referring to fig. 4, during assembly welding, the mandrel, the end plate, the outer ring and the rib plate are firstly subjected to spot welding, then the rib plate and the end plate, the rib plate and the mandrel outer ring are sequentially welded, full-welded double-sided fillet welds are adopted, preset intervals are arranged on the rib plates, and generally, six rib plates, eight rib plates and the like are arranged. And finally, welding the mandrel and the end plate, and welding the outer ring and the end plate by adopting a circumferential weld to the groove. The cover side positioning spigot 22 is embedded into the shaft side positioning spigot 12 to complete positioning, and is embedded and installed. The shaft side or the cover side is welded after the insert mounting. The shaft-side piston body 11 and the cover-side piston body 21 are positioned and mounted by engagement of the cover-side positioning spigot 22 with the shaft-side positioning spigot 12.

Referring to fig. 3, the cover-side positioning spigot 22 and the outer surface of the shaft-side positioning spigot 12 are positioned between the cover-side piston body 21 and the shaft-side piston body 11 by the positioning spigot, the inner hole of the shaft-side piston body 11 is in shoulder with the piston rod 34, and the cover-side lock nut 36 is combined with both ends of the piston rod 34. The cover side positioning spigot 22 and the shaft side positioning spigot 12 are arranged in a gapless manner, the shaft side positioning spigot 12 and the cover side positioning spigot 22 are adopted for positioning, the outer ring end surfaces of the piston main bodies 1 are better in contact, gaps are avoided, the two piston main bodies 1 are not easy to deform during operation, and a spacing distance is arranged between the cover side piston body 21 and the shaft side piston body 11 after the cover side positioning spigot 22 and the shaft side positioning spigot 121 are matched.

Referring to fig. 3, at least a pair of shaft side supporting rings 321 are provided on the outer surface of the shaft side outer ring 113, at least a pair of cover side supporting rings 322 are provided on the outer surface of the cover side outer ring 213, and the shaft side supporting rings 321 and the cover side supporting rings 322 are sealing members, and the sealing members further include piston rings 33. The shaft side support ring 321, the cover side support ring 322, and the piston ring 33 are seals. The shaft side support ring 321, the cover side support ring 322, the piston ring 33 are not welded and fixed to the piston body 1, but are assembled, and the shaft side support ring 321, the cover side support ring 322, and the piston ring 33 are open plastic members. The axial positioning spigot 12 and the cover positioning spigot 22 are respectively arranged on the same axis as the axial piston body 11 and the cover side piston body 21, the inner shape of the axial positioning spigot 12 is matched with the appearance of the cover side positioning spigot 22, when the piston is installed, the axial positioning spigot 12 and the cover side piston body 22 are only required to be jointed as the axial positioning spigot 11 and the cover side piston body 21 are arranged on the same axis, so that the outer ring end face of the assembled piston body 1 is better in contact, gaps are not formed in welding, the two piston bodies are not easy to deform in working, the cover side positioning spigot 22 is embedded into the axial positioning spigot 12 to finish positioning, the axial piston body 11 and the cover side piston body 21 are positioned and installed through the joint of the cover side positioning spigot 22 and the axial positioning spigot 12, the piston body 1 adopts a combined structure, the axial piston body 11 and the cover side piston body 21 are assembled through positioning through the positioning of the ports, the combined structure can enable the axial piston body 11 and the cover side piston body 21 to be deformed, the combined structure and the welded depth of the piston body can be reduced as compared with the conventional welding process of the piston body, and the weight of the combined structure can be reduced, and the weight of the combined structure can be welded to the end part of the piston body is further reduced. After welding, ultrasonic wave is adopted to detect the quality of the welding seam, and then the whole piston is subjected to heat treatment annealing to remove welding stress.

Referring to fig. 1 and 2, the shaft-side piston body 11 includes a shaft-side core shaft 111, a shaft-side end plate 112, a shaft-side outer ring 113, a shaft-side rib plate 114, and a shaft-side lug 311, wherein a shaft-side lifting screw hole 115 is formed in the shaft-side lug 311, and the shaft-side lug 311 is assembled and welded with the shaft-side end plate 112. 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, a cover-side rib plate 214 and a cover-side lug 312, wherein cover-side lifting screw holes 215 are formed in the cover-side lug 312, and the cover-side lug 312 and the cover-side end plate 212 are assembled and welded. When the screw holes are hoisted, an internal screw hole is machined on the lug, and the lug is welded with the end plate. The shaft side mandrel 111 is in a countersunk hole arrangement and comprises 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, rib plate through holes 118 are formed in the shaft side rib plates 114, the shaft side end plate 112 is arranged at the end part of the first shaft side ring 116, which is far away from the second shaft side ring 117, the cover side mandrel 211 is also in a countersunk hole arrangement and comprises a first cover side ring 216 and a second cover side ring 217, the shaft side rib plates 114 and the cover side rib plates 214 which are uniformly distributed ensure the rigidity of the piston main body 1, meanwhile, the strength of the shaft side end plate 112 and the cover side end plate 212 with the largest stress is enhanced, and a plurality of grooves with different depths and different widths are formed in the outer ring of the piston main body 1 and are used for arranging the supporting ring of the piston part and the piston ring 33.

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, the cover side end plate 212, the shaft side outer ring 113 and the cover side outer ring 213 are made of steel plates Q345R for boilers and pressure containers, the shaft side rib plates 114, the cover side rib plates 214, the shaft side lugs 311 and the cover side lugs 312 are made of Q235B steel plates, so that the weight of the piston main body 1 is reduced, the strength and the rigidity of the piston main body 1 can be ensured, the shaft side core shaft 111 and the cover side core shaft 211 are forged pieces, and the shaft side end plate 112, the cover side end plate 212, the shaft side outer ring 113 and the cover side outer ring 213 are made of rolled steel plates in a normalizing state.

Preferably, the shaft side rib plate 114, the shaft side end plate 112, the shaft side mandrel 111, the shaft side outer ring 113, the cover side rib plate 214, the cover side end plate 212, the cover side mandrel 211 and the cover side outer ring 213 are all full-welded double-sided fillet welds. The outer rings of the shaft side end plate 112 and the shaft side mandrel 111, the cover side end plate 212 and the cover side mandrel 211, and the cover side end plate 212 and the cover side mandrel 211 are all arranged by adopting reverse slope annular welding seams. The reverse bevel annular welding seam is an annular welding seam formed at the joint of two workpieces, wherein the edge of one side workpiece is cut into a slope shape to form an annular groove. The reverse slope mouth annular welding seam can improve welding quality, the design of the reverse slope mouth annular welding seam can promote the full melting and penetration of welding materials, improve welding quality and reduce the generation of welding defects. The reverse slope mouth annular welding seam can save materials and reduce weight. Due to the design of the reverse slope annular welding seam, the required filling materials are relatively less during welding, and the material cost can be saved.

Preferably, the cover side piston body 21 and the shaft side piston body 11 are locked and fixed by the piston rod 34 and the lock nut between the cover side positioning spigot 22 and the shaft side positioning spigot 12, the outer surface of the cover side positioning spigot 22 and the outer surface of the shaft side positioning spigot 12 are arranged in a gapless way after being fixed, the outer ring end surfaces of the piston main bodies 1 are positioned by adopting the shaft side positioning spigot 12 and the cover side positioning spigot 22, gaps are not formed, the two piston main bodies 1 are not easy to deform during working, and a spacing distance is arranged between the shaft side rib plates 114 and the cover side rib plates 214 after the cover side piston body 21 and the shaft side piston body 11 are assembled by matching the cover side positioning spigot 22 and the shaft side positioning spigot 12.

Preferably, the shaft-side end plate 112 and the cover-side end plate 212 are each provided with an end plate shaft hole 119 which is coaxial with and penetrates the shaft-side core shaft 111 and the cover-side core shaft, and the shaft-side piston body 11 and the cover-side piston body 21 are assembled by the cooperation of the cover-side positioning spigot 22 and the shaft-side positioning spigot 12, and then the weld quality of the internal components is detected by ultrasonic waves, and the weld quality is detected by ultrasonic waves after welding, and the whole is subjected to heat treatment and the welding stress is removed by annealing.

Example 2

Referring to fig. 1 and 2, the embodiment of the utility model provides a novel large-diameter piston component of a reciprocating compressor, wherein a combined welding piston structure is adopted for a large-diameter piston main body 1 to reduce the weight of the piston main body due to the limitation of the weight, reduce the reciprocating inertia force, reduce the bearing specific pressure of the piston main body 1, prolong the service life of a bearing ring and ensure the sealing performance of the piston, and the combined welding piston main body 1 can ensure that the welding process of the piston main body 1 is improved and all-around welding can be realized among all components. The overall strength and rigidity of the piston main body 1 are ensured; if aging treatment is imperfect in the manufacturing process, compared with an integral welding piston body 1, a combined welding piston body 1 can compensate the later stress release to the greatest extent, deformation and even weld seam tearing of the piston body 1 are avoided, through selection of materials, a common carbon steel plate is adopted for a general welding piston, performance is poor, effective thickness of each part needs to be increased to ensure integral mechanical strength, low-alloy and high-strength steel materials are adopted for the product, excellent welding performance can be ensured, effective thickness of each part can be reduced, the integral strength is ensured, meanwhile, the weight of the piston can be furthest reduced, manufacturing cost is saved, economy of popularization is achieved, the piston part can replace an original cast iron or welding piston under the working condition that oiling is required, oiling is omitted, oil lubrication technology is greatly reduced, running cost is saved, and because the supporting ring matched with the piston body 1 belongs to a carbon fiber reinforced material, the supporting ring length is shortened under the condition that the supporting specific pressure of the piston is met, the specific pressure of the supporting ring needs to be ensured to be less than 0.3kg/cm ² under the condition of specific pressure.

Example 3

Referring to fig. 1 and 3, the embodiment of the utility model provides a novel large-diameter piston part of a reciprocating compressor, which has the advantages that the structure of the piston part is optimized, a piston main body 1 is formed by a shaft-side piston body 11 and a cover-side piston body 21, the piston main body is matched and installed after being positioned through an inner shaft-side positioning spigot 12 and a cover-side positioning spigot 22, the piston main body adopts a combined welding piston body structure, the welding process can reach higher standards, the pistons manufactured by most compressor manufacturers at present adopt casting or forging pistons, the requirements of strength and rigidity are met, but due to the fact that the piston diameter is large, the casting or forging pistons cannot be adopted, the reciprocating inertial force of the whole unit is large, the bearing specific pressure is large, the equipment operation is not stable enough, the use is influenced, and the large-diameter aluminum alloy pistons cannot meet the process of corrosion to aluminum. In order to solve the problem, some manufacturers have adopted the structure of welding pistons, and general welding pistons adopt an integral structure, and because of the limitation of the integral design structure, the welding process has certain defects, so that the inner reinforcing rib plate and the end face of the piston or the outer ring of the piston can not be welded all the time, the strength and the rigidity of the piston can be weakened under the same condition, and the piston body is damaged. The combined welding piston body structure is used to separate the parts of the piston body 1 into the parts of the shaft side piston body 11 and the cover side piston body 21, and then the parts of the shaft side piston body 11 and the cover side piston body 21 are welded respectively, so that the welding of the parts can cover all positions, dead angles which cannot cover the welding are avoided, and the shaft side rib plate 114, the shaft side end plate 112, the shaft side mandrel 111, the shaft side rib plate 114, the shaft side end plate 112 and the shaft side mandrel 111, Shaft-side outer ring 113, cover-side rib plate 214, cover-side end plate 212, The cover side mandrel 211 and the cover side outer ring 213 can be welded in all directions, the whole strength and rigidity of the piston main body 1 can be guaranteed by adopting a welding piston structure, the weight can be reduced, the reciprocating inertia force can be reduced, the bearing specific pressure of the piston main body 1 can be reduced, the service life of a bearing ring of the piston main body 1 can be prolonged, the sealing performance of the piston is guaranteed, compared with the integral welding piston main body 1, the combined welding piston main body 1 can solve the problem that the ageing treatment possibly exists in the manufacturing process of the piston main body 1 is imperfect, in this case, the later stress release can be compensated to the greatest extent, the deformation of the piston main body 1 and even the tearing of a welding line are avoided, the relative simple design and manufacturing processes such as welding and the like are adopted for each part of the piston main body 1, the production cost and the manufacturing cycle are reduced, the outer ring of the piston main body 1 is fixed by welding, the full welding double-face angle and the inverted-mouth annular welding line are adopted, the firmness and the stability of the welding connection are guaranteed, the durability and the reliability of the part are improved, the quality of the welding line quality of the ultrasonic detection welding line after the outer ring of the piston main body 1 is welded, and the quality of the welding quality is guaranteed to meet the standard requirements and the quality requirements of the welding quality are further improved. In conclusion, the piston component has the beneficial effects of simple structure, convenience in manufacturing, accurate positioning, firm structure, controllable welding quality and the like, and can effectively improve the performance and stability of the reciprocating compressor, reduce the production cost and improve the product quality.

It should be noted that the above embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present utility model.

Claims (10)

1. The large-diameter novel piston part of the reciprocating compressor is characterized by comprising a piston main body (1), wherein the piston main body (1) consists of a shaft-side piston body (11) and a cover-side piston body (21), a shaft-side positioning spigot (12) and a cover-side positioning spigot (22) are respectively arranged on one surface of the shaft-side piston body (11) connected with the cover-side piston body (21), and the shaft-side piston body (11) and the cover-side piston body (21) are connected through the shaft-side positioning spigot (12) and the cover-side positioning spigot (22);

The shaft-side piston body (11) comprises a shaft-side mandrel (111), a shaft-side end plate (112), a shaft-side outer ring (113) and a shaft-side rib plate (114), wherein the shaft-side rib plate (114) is fixed with the shaft-side mandrel (111), the shaft-side end plate (112) and the shaft-side outer ring (113) through welding, the cover-side piston body (21) comprises 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 cover-side rib plate (214) is fixed with the cover-side mandrel (211), the cover-side end plate (212) and the cover-side outer ring (213) through welding, and the welding connection adopts reverse-slope annular welding;

The shaft-side piston body (11) and the cover-side piston body (21) are fixed through a piston rod (34) arranged in the shaft-side mandrel (111) and the cover-side mandrel (211), and the piston rod (34) locks the shaft-side piston body (11) and the cover-side piston body (21) with the piston rod (34) through a cover-side locking nut (36).

2. The large-diameter novel piston part of a reciprocating compressor according to claim 1, wherein the shaft-side positioning spigot (12) and the cover-side positioning spigot (22) are arranged coaxially with the shaft-side piston body (11) and the cover-side piston body (21), respectively, the inner shape of the shaft-side positioning spigot (12) is matched with the outer shape of the cover-side positioning spigot (22), and the shaft-side piston body (11) and the cover-side piston body (21) are positioned by the engagement of the cover-side positioning spigot (22) and the shaft-side positioning spigot (12).

3. The large-diameter novel piston component of a reciprocating compressor according to claim 1, wherein the shaft-side piston body (11) is provided with a shaft-side lug (311), the cover-side piston body (21) is provided with a cover-side lug (312), the shaft-side lug (311) and the cover-side lug (312) are respectively provided with a shaft-side hoisting screw hole (115) and a cover-side hoisting screw hole (215), the shaft-side lug (311) is welded on the shaft-side end plate (112), and the cover-side lug (312) is welded on the cover-side end plate (212).

4. The large-diameter novel piston component of a reciprocating compressor according to claim 1, wherein at least a pair of shaft side supporting rings (321) are arranged on the outer surface of the shaft side outer ring (113), at least a pair of cover side supporting rings (322) and piston rings (33) are arranged on the outer surface of the cover side outer ring (213), the shaft side supporting rings (321) are connected with the outer surface of the shaft side outer ring (113) in a matched mode, the cover side supporting rings (322) are connected with the outer surface of the cover side outer ring (213) in a matched mode, and the piston rings (33) are arranged on the shaft side outer ring (113) and the cover side outer ring (213).

5. The large-diameter novel piston component of the reciprocating compressor according to claim 3, wherein the shaft side mandrel (111) is arranged in a countersunk hole and comprises 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, rib plate through holes (118) are formed in the shaft side rib plates (114) for weight reduction, and the shaft side end plate (112) is arranged at the end part of the first shaft side ring (116) far away from the second shaft side ring (117).

6. The large diameter new piston component of reciprocating compressor of claim 4, wherein said cap side mandrel (211) is counter bored and comprises a first cap side ring (216) and a second cap side ring (217).

7. The large-diameter novel piston part of a reciprocating compressor according to any one of claims 2 to 4, wherein 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 with the shaft-side end plate (112), the shaft-side mandrel (111) and the shaft-side outer ring (113) in a welded mode and adopts full-welded double-sided fillet welds or girth welds, and the cover-side rib plate (214) is fixedly connected with the cover-side end plate (212), the cover-side mandrel (211) and the cover-side outer ring (213) in a welded mode and adopts full-welded double-sided fillet welds or girth welds.

8. The large-diameter novel piston part of a reciprocating compressor according to claim 1, wherein the shaft side positioning spigot (12) and the cover side positioning spigot (22) are respectively arranged in a convex and concave manner on the outer ring of the shaft side piston body (11) and the outer ring of the cover side piston body (21), and the shaft side positioning spigot (12) and the cover side positioning spigot (22) are engaged and positioned through the convex and concave portions.

9. The large-diameter novel piston part of a reciprocating compressor according to claim 4, wherein a cover side positioning spigot (22) and a shaft side positioning spigot (12) are assembled and fixed between the cover side piston body (21) and the shaft side piston body (11), a joint end face is arranged in a gapless manner after the cover side positioning spigot (22) and the shaft side positioning spigot (12) are matched, and a separation distance is arranged between a shaft side rib plate (114) and a cover side rib plate (214) after the cover side piston body (21) and the shaft side piston body (11) are matched and installed through the cover side positioning spigot (22) and the shaft side positioning spigot (12).

10. The large-diameter novel piston member of a reciprocating compressor according to claim 4, wherein the shaft-side end plate (112) and the cover-side end plate (212) are each provided with an end plate shaft hole (119) which is coaxial with and penetrates the shaft-side core shaft (111) and the cover-side core shaft (211), respectively.