A kind of detached type piston rod attachment and its forming methodTechnical field
The present application relates to a kind of detached type piston rod attachment and its forming method, can be applicable to medical treatment and setIn standby.
Background technology
Formula structure is often made of one between piston rod common at present and piston or is connected by pin, neededIt is very inconvenient when maintenance or dismounting；A kind of attachment means are disclosed in prior art, using the union jointTighten up when outer surface is pressurized, the connecting rod for putting in attachment means can be compressed, while union joint leading portion is provided withBack-off structure, can effectively prevent connecting rod from coming off.
Must assure that to work in terms of due to piston selection to have enough under high temperature, high pressure, high-load conditionIntensity, rigidity, while its coefficient of friction between piston cavity is as little as possible, while will also ensure temperatureDuring degree change, own dimensions, change of shape are little, and minimum gap will be kept and between piston cavity,Therefore costly, if overall adopt such material, cost is high for the material price general charged selected.AndAnd conventional piston structure makes piston portion bear high pressure, in turn result in its between piston cavity frictional force compared withGreatly, it is more easy to wear.
The content of the invention
The present patent application is for the above-mentioned deficiency in the presence of current piston rod and piston coupling structurePlace, there is provided a kind of to be easy to piston rod to be connected piston rod attachment and its forming method with dismounting with piston.
One purpose of the present patent application is to provide a kind of detached type piston rod attachment, including connector, workPlug ring and the union joint with piston rod detachable connection, piston ring set outside connector, connector be connectedHead is combined closely.
Further, the end of the connector is provided with baffle plate, bears most of pressure in piston, makes fluidRemake with the gap of piston cavity by connector and used on piston ring.
Further, the first screens combined closely with piston ring is respectively equipped with the connector, and is connectedThe second screens that part is combined closely.
Further, the connector is metal, enables flow through the gap of metal connecting piece and piston cavityRemake and use on piston ring, while playing a part of effective support to piston ring and mitigating its materials'use.
Further, the piston ring be elastic material, its physical dimension be more than plunger shaft internal diameter, so existDuring advancing to piston intracavity, inwardly extruding is tightened up at piston piece edge, and decrement makes which be adjacent to plunger shaftInwall, sealing effectiveness are more preferable.
Further, the piston ring is provided with free empennage near the end of connector, empennage be connectedThere is between part fluid passage, empennage is adjacent to into piston cavity wall during fluid flows through fluid passage.So setMeter, is to strut empennage Jing after connector end for fluid, it is ensured that sealing effectiveness.
Further, the piston ring is coordinated with connector and is adjacent to or integral by being molded.
Further, the detached type piston rod attachment also includes strengthening connector, strengthens connector and is enclosed withinOutside connector, between union joint and piston ring, and combine closely with union joint.
Further, the reinforcement connector strengthens connector and/or connector by being located at connectorOn attachment structure be closely engaged.
Further, the attachment structure includes screw thread or groove structure, the reinforcement connector be connectedPart passes through screw thread or groove is closely engaged.
Further, the reinforcement connector is provided with the 3rd screens combined closely with union joint.
Reinforcement connector is selectable unit, by being engaged with the tight of connector, is mainly used in：First, to workPlug ring plays pressuring action, second, increasing a screens, more effectively prevents union joint from coming off.
Further, the union joint is the elastic construction that can gather and open.
Further, be provided with can be with the 4th screens of piston rod detachable connection for the union joint.
Further, the union joint stretches out several snap finger, barb or the back-offs that can gather and open, theFour screens are located at the end of snap finger, barb or back-off.
Further, the union joint be elastic material, its physical dimension be more than plunger shaft internal diameter, so existDuring piston is advanced to piston intracavity, union joint inwardly extrudes gathering, so as to the clamping to piston rod is imitatedFruit is more preferably.
Another purpose of the present patent application is to provide the forming method of above-mentioned detached type piston rod attachment, bagInclude following steps：
1st, machining piston ring；
2nd, the precedence for processing connector, step 1 and step 2 can be exchanged, as needed can be evenCorresponding screens or/and attachment structure are processed on fitting；
3rd, by piston ring, first side loads connector from childhood；
4th, connector and piston ring that formation is processed in above-mentioned steps are molded as mold insert, the company of being formedJoint.
Further, can process and strengthen connector after step 3, and load reinforcement connection on connectorPart, piston ring is further compressed.
Further, the 3rd screens can be processed on connector is strengthened.
Further, in step 1, machining piston ring can adopt machining mode or adopt injection mo(u)ldingMode.
Further, PTFE, PPSU, polyether-ether-ketone (PEEK) are included using the material of injection moldingOr modified polyetheretherketonefiber.
PTFE is called " politef ", and this material is with resistant to elevated temperatures feature, its friction systemNumber is extremely low；PPSU is called " polyphenylene sulphone resin ", is novel thermoplastic engineering plastic, rigidity andGood toughness, heatproof, resistance to thermal oxide, creep-resistant property are excellent, inorganic acid resistance, alkali, the corrosion of saline solution,Resistance to ionizing radiation, it is nontoxic, insulating properties and self-extinguishment it is good, easy processing and forming；PEEK is called " polyethers etherKetone ", is a kind of special engineering plastics of excellent performance, with more aobvious compared with other special engineering plasticsWork advantage, 260 degree of high temperature resistant, mechanical performance are excellent, self lubricity is good, chemicals-resistant burn into is fire-retardant.
Further, in step 4, the injected plastics material includes PE, PP or PVC.
Detached type piston rod attachment described in the present patent application is simple and practical, low cost, and processes systemMake easy, connector plays baffle effect, bears most of pressure, enables flow through connector and plunger shaftThe gap of body remakes uses on piston ring, and connector plays effective support and mitigates its material simultaneously to piston ringThe effect for using；Strengthen connector pressuring action is played to piston ring, by increase screens, more effectivelyPrevent union joint from coming off；The design of piston ring empennage, then serve and further strengthen sealing by fluid itselfEffect.
Description of the drawings
Side views of the Fig. 1 for detached type piston rod attachment one embodiment described in the present patent application；
Axial section structures of the Fig. 2 for detached type piston rod attachment one embodiment described in the present patent applicationSchematic diagram；
Top views of the Fig. 3 for Fig. 1 embodiments；
Fundamental diagrams of the Fig. 4-6 for detached type piston rod attachment one embodiment described in the present patent application；
Fig. 7 is the mplifying structure schematic diagram of local A in Fig. 5；
Wherein, 1 connector, 10 be baffle-type structure, 2 be piston ring, 20 be empennage, 21 be fluidPassage, 3 for strengthen connector, 4 be union joint, 40 be snap finger, 51 be the first screens, 52 be secondScreens, 53 be the 3rd screens, 54 be the 4th screens, 6 be piston rod, 7 be attachment structure, 8 be pistonChamber.
Specific embodiment
Technical scheme described in the present patent application is described without limitation below in conjunction with accompanying drawing, it is therefore an objective to beThe public more fully understands the technology contents.
Embodiment one
As Figure 1-3, be detached type piston rod attachment described in the present patent application one embodimentStructure chart, in this embodiment, described detached type piston rod attachment include connector 1, piston ring 2,Strengthen connector 3 and the union joint 4 with piston rod detachable connection, piston ring 2 is enclosed within outside connector 1,Connector 1 is combined closely with union joint 4, and connector 1 is metal material, and an end is baffle-type structure10, the first screens 51 combined closely with piston ring 2 is provided with the end, another end is provided with and connectsThe second screens 52 that fitting 4 is combined closely, strengthens connector 3 and is enclosed within outside connector 1, positioned at connectionBetween 4 and piston ring 2, and combined closely by the 3rd screens 53 with union joint 4, and by connectionStructure 7 (being screw thread herein) is closely engaged with connector 1, the union joint 4 stretch out several can gather andThe snap finger 40 (can also be barb or back-off) opened, snap finger 40 is provided with and the 4th screens 54 and pistonThe connection of bar detached type.
The connector 1 is metal connecting piece, plays baffle effect, bears most of pressure, leads to fluidThe gap for crossing metal connecting piece and piston cavity remakes and uses on piston ring 2, and metal connecting piece is simultaneously to pistonRing plays a part of effective support and mitigates its materials'use.Reinforcement connector 3 is selectable unit, to piston ring2 play pressuring action, additionally by a screens is increased, more effectively prevent coming off for union joint 4.
During use, piston rod 6 is inserted in union joint 4, it is during advancing into plunger shaft 8, livingPlug 8 internal diameter of chamber diminishes, and union joint 4 gathers piston rod 6, and promotes piston inwardly to move；Work as piston rod6 when pulling out, and pulls piston to move out by the screens with union joint 4, until exit plunger shaft8 internal diameter expands, and union joint 4 unclamps, and piston rod 6 can be departed from union joint 4, so as to realize pistonReciprocating motion and shirk with piston.
Embodiment two
As shown in figs. 4-7, in this embodiment, detached type piston rod attachment includes connector 1, pistonRing 2, strengthen connector 3 and union joint 4, piston ring 2 is enclosed within outside connector 1, connector 1 with evenJoint 4 is combined closely, and 1 end of connector is baffle-type structure 10, is provided with and piston ring 2 in the endThe first screens 51 combined closely, another end are provided with the second screens 52 combined closely with connector 4,Strengthen connector 3 to be enclosed within outside connector 1, between union joint 4 and piston ring 2, and and union joint4 are combined closely by the 3rd screens 53, and are closely engaged with connector 1 by attachment structure 7, describedUnion joint 4 stretches out the several snap fingers 40 that can gather and open, snap finger 40 be provided with the 4th screens 54 withThe connection of piston rod detached type.
In the present embodiment, the piston ring 2 be elastic material, its physical dimension be more than 8 internal diameter of plunger shaft,And piston ring 2 is provided with free empennage 20 near the end of connector 1, between empennage 20 and connector 1With fluid passage 21, empennage is adjacent to into piston cavity wall (such as Fig. 7 arrows during fluid flows through fluid passageIt is shown).So design, be empennage to be strutted Jing after connector end for fluid, it is ensured that sealing effectReally.Likewise, the union joint 1 is elastic material, its physical dimension is more than 8 internal diameter of plunger shaft, soDuring piston is advanced to piston intracavity, union joint 1 inwardly draw in by extruding, so as to piston rod 5Clamping effect it is more preferable.
Described in the present patent application, the forming method of detached type piston rod attachment, comprises the steps：
1st, machining piston ring, machining piston ring can adopt machining mode or adopt injection molding；
2nd, the precedence for processing connector, step 1 and step 2 can be exchanged, as needed can be evenCorresponding screens or/and screw thread are processed on fitting；
3rd, by piston ring, first side loads connector from childhood；Can process and strengthen connector after step 3,And load reinforcement connector on connector, piston ring is further compressed, can be processed on connector is strengthenedCorresponding positions；
4th, connector and piston ring that formation is processed in above-mentioned steps are molded as mold insert, the company of being formedJoint, can process snap finger and corresponding screens on union joint.
It should be understood that the above includes that accompanying drawing is not the restriction to the technical scheme, in fact,Under identical or approximate principle, the improvement carried out by the technical scheme, including Each part shape,Size, material used, and the equivalent of essentially identical functional structure, all required by the present patent applicationWithin the technical scheme of protection.