CN115288875A

CN115288875A - Sealed crankcase of oil-free piston

Info

Publication number: CN115288875A
Application number: CN202211232573.8A
Authority: CN
Inventors: 林秀清; 董蓉蓉; 蒋海敏
Original assignee: Sihong Yicheng Machinery Manufacturing Co ltd
Current assignee: Sihong Yicheng Machinery Manufacturing Co ltd
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2022-11-04
Anticipated expiration: 2042-10-10
Also published as: CN115288875B

Abstract

The invention belongs to the technical field of crank cases, and particularly relates to a sealed crank case of an oil-free piston, which comprises a lower crank case component, an upper crank case component and a ventilation component, wherein the lower crank case component is connected with the upper crank case component through a connecting piece; the upper crankcase assembly comprises a second housing, a piston mechanism and a recovery mechanism; the top end of the second shell is provided with a plurality of groups of piston cavities, and the inner walls of the piston cavities are in sliding connection with the piston mechanism; the one end and the lower crankcase subassembly intercommunication of ventilation subassembly, the other end and last crankcase subassembly intercommunication, make the interior crankshaft connecting rod mechanism operation of crankcase subassembly down, utilize the ventilation subassembly to inhale the gas in the crankcase subassembly down, and will accomodate the gaseous reinjection into the piston mechanism in the last crankcase subassembly after the cooling through the ventilation subassembly, when guaranteeing the piston mechanism cooling operation, can be again with the ventilation subassembly in remaining gas injection into the crankcase subassembly down, make the ventilation efficiency of crankcase subassembly down obtain promoting.

Description

Sealed crankcase of oil-free piston

Technical Field

The invention belongs to the technical field of crank cases, and particularly relates to a sealed crank case of an oil-free piston.

Background

The gas in the combustion chamber inevitably flows into a crankcase from a piston ring during the operation of the engine, the main components of the gas comprise combusted gas, unburned gas, water vapor and the like, the oil can be diluted, the service performance of the oil is reduced, the oxidation and the deterioration of the oil are accelerated, the water vapor is condensed in the oil to form oil sludge and block an oil path, and acid gas in exhaust gas is mixed into a lubricating system to cause the corrosion and the accelerated wear of engine parts. The blow-by gas also causes the over-high pressure of the crankcase to damage the sealing of the crankcase, so that the engine oil leaks and runs off to affect the performance and reliability of the whole machine.

Through retrieval, in the prior art, the Chinese patent application number: cn201721234801.X, application date: 2017-09-25, which discloses a sealed crankcase of an oil-free piston, and solves the technical problems that in the prior art, the sealing degree between the piston and a piston ring is poor, so that air leakage is caused, the middle part of a piston pin is stressed too much, deformation and fracture are caused, and the corrosion rigidity of a connecting rod is too low. By providing a new sealed crankcase of an oil-free piston, the outer surface of the piston is provided with an annular groove, and the piston is connected with a piston ring through the groove; the shape of the inner hole of the piston pin is two uniformly-divided hollow cylinders, and the two hollow cylinders are formed by isolating a thick-wall cylinder; the outer surface of the connecting rod is carburized and quenched, and then a titanium layer and a nickel layer are sequentially plated on the outer surface of the connecting rod. The utility model discloses a have the characteristics of prevent that gas from scurrying into the rigidity of crankcase, reinforcing connecting rod and piston pin through the piston, can put into operation in a large number and make with the production in automobile engine field.

However, the device still has the following defects: although the crankcase can prevent gas from entering the crankcase through the piston and strengthen the rigidity of the connecting rod and the piston pin, the crankcase can be put into production in the field of automobile engines in a large amount, but does not have the ventilation effect of the crankcase, and the negative pressure of the engine is easily increased.

Disclosure of Invention

In view of the above problems, the present invention provides a sealed crankcase of an oil-free piston, including a lower crankcase assembly, an upper crankcase assembly, and a ventilation assembly;

the upper crankcase assembly comprises a second housing, a piston mechanism and a recovery mechanism; the top end of the second shell is provided with a plurality of groups of piston cavities, the inner walls of the piston cavities are in sliding connection with the piston mechanism, the recovery mechanism is fixedly connected to the outer wall of the second shell, and the recovery mechanism is respectively communicated with the lower crankcase assembly and the piston cavities;

the piston mechanism comprises a piston cylinder body and a bearing part; two groups of fifth through holes are symmetrically formed in the outer walls of the two sides of the piston cylinder body, the bearing part is fixedly connected to the inner wall of the piston cylinder body, and the bearing part is communicated with the two groups of fifth through holes;

the bearing part comprises an outer steel ring; a sixth through hole is formed in one side wall of the outer steel ring, a seventh through hole is formed in the other side wall of the outer steel ring, the sixth through hole and the seventh through hole are communicated with the two groups of fifth through holes, a stamping plate is fixedly connected to the top end of the outer steel ring, an inner steel ring is fixedly connected to the bottom end of the stamping plate, a triangular prism flow guide block is fixedly connected to the outer wall of one side of the inner steel ring, and the central axis of the triangular prism flow guide block is overlapped with the central axis of the seventh through hole;

the top of lower crankcase subassembly and the bottom fixed connection of second casing, ventilation assembly fixed connection is the same lateral wall of crankcase subassembly and second casing under, just ventilation assembly communicates each other with lower crankcase subassembly and piston chamber respectively.

Further, the lower crankcase assembly includes a first housing;

the first casing is open structure, the first bearing frame of the inner wall fixedly connected with of first casing a plurality of groups, a plurality of groups first bearing frame is the equidistance and distributes at the inner wall of first casing, and every two sets of be provided with the working chamber between the adjacent lateral wall of first bearing frame.

Furthermore, a plurality of groups of first through holes and a plurality of groups of second through holes are respectively formed in one side wall of the first shell, the plurality of groups of first through holes and the plurality of groups of second through holes are communicated with the ventilation assembly, the plurality of groups of first through holes are located at the top end of the level of the plurality of groups of second through holes, a plurality of groups of third through holes are respectively formed in the other side wall of the first shell, the level of the plurality of groups of third through holes is consistent with the level of the first through holes, and a plurality of groups of first bolt columns are symmetrically and fixedly connected to the outer wall of the first shell.

Furthermore, a plurality of groups of fourth through holes are formed in one side wall of the second shell, the fourth through holes are located on one side close to the first through holes, the fourth through holes are communicated with the piston cavity, the fourth through holes are communicated with the ventilation assembly, and a plurality of groups of second bolt columns are symmetrically and fixedly connected to the outer wall of the second shell.

Furthermore, the inner wall fixedly connected with a plurality of groups of conducting strips of inner steel ring, a plurality of groups the conducting strip uses the axis of inner steel ring to be the setting of annular array as the center, a plurality of groups the equal fixedly connected with heat-conducting post of one end that the conducting strip is close to inner steel ring axis, heat-conducting post and a plurality of groups the conducting strip all is connected with the bottom fixed of punching press board, be provided with cyclic annular water conservancy diversion chamber between outer steel ring and the inner steel ring.

Further, the ventilation assembly comprises a fourth shell and a low-temperature gas injection part;

the top end of the inner wall of the fourth shell is fixedly connected with a negative pressure pump, the bottom end of the inner wall of the fourth shell is fixedly connected with a butt valve, a flow guide pipe is connected between the negative pressure pump and the butt valve, and an oil-gas separator is arranged on the flow guide pipe.

Furthermore, one side of the outer wall of the flow guide pipe, which is close to the butt valve, is communicated with an air suction pipe, one end of the air suction pipe is communicated with the first through hole, one side of the outer wall of the flow guide pipe, which is close to the negative pressure pump, is communicated with an air injection pipe, and the air injection pipe is communicated with the fourth through hole.

Further, low temperature gas injection portion fixed connection just communicates each other on the gas injection pipe, the bottom mounting and the intercommunication of butt joint valve have the oil discharge return bend, be provided with the second check valve on the oil discharge return bend, just the one end and the second through-hole of oil discharge return bend are interconnected and communicate.

Further, the low-temperature gas injection part comprises a fifth shell;

the fan is fixedly connected to the inner wall of one side of the fifth shell, the negative pressure hole communicated with the fan is formed in the outer wall of the fifth shell, the wind collecting cover is fixedly connected to the inner wall of the other side of the fifth shell, and the air exhaust hole communicated with the wind collecting cover is formed in the outer wall of the fifth shell.

Furthermore, the inner wall of the air-collecting cover is arranged in a conical shape, the inner wall of the air-collecting cover is fixedly connected with a plurality of groups of semiconductor refrigerating sheets, and the diameter of an opening, close to one end of the fan, of the air-collecting cover is larger than that of an opening at the other end of the fan.

The beneficial effects of the invention are:

1. the one end and the lower crankcase subassembly intercommunication of ventilation subassembly, the other end and last crankcase subassembly intercommunication, make the interior crankshaft connecting rod mechanism operation of crankcase subassembly down, utilize the ventilation subassembly to inhale the gas in the crankcase subassembly down, and will accomodate the gaseous reinjection into the piston mechanism in the last crankcase subassembly after the cooling through the ventilation subassembly, when guaranteeing the piston mechanism cooling operation, can be again with the ventilation subassembly in remaining gas injection into the crankcase subassembly down, make the ventilation efficiency of crankcase subassembly down obtain promoting.

2. Through the effect that negative pressure hole and air exhaust hole are used for communicateing the gas injection pipe, produce the negative pressure when making the fan pivoted, with the gas suction in the guiding pipe and transmit to the air-collecting cover in, utilize a plurality of groups semiconductor refrigeration pieces that the air-collecting cover inner wall set up, make the gas temperature that the fan produced reduce to give the gas injection pipe with low temperature gas through the hole of airing exhaust, the refrigeration efficiency of effectual improvement piston cylinder body prevents that piston cylinder body temperature is too high.

3. Through one side the cooperation of fifth through-hole and sixth through-hole is used for the low temperature gas that will connect the injection into to annular water conservancy diversion chamber through outer steel ring and interior steel ring formation makes low temperature gas outwards discharge by seventh through-hole and opposite side in proper order under the effect of triangular prism water conservancy diversion piece for low temperature gas has improved the radiating efficiency of piston cylinder body at the internal circulation cooling's of piston cylinder effect.

4. Through admitting air the chamber and taking in seventh through-hole and opposite side the outside exhaust gas of fifth through-hole to inject gas into the intracavity of giving vent to anger through first check valve, and through giving vent to anger the chamber with the gas of injecting into by the third through-hole backward flow to first casing in, be used for the effect of first casing inner loop ventilation, when preventing the gas reflux, improve gas circulation's effect.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 shows a schematic structural view of a crankcase in accordance with an embodiment of the invention;

FIG. 2 illustrates a schematic structural view of a lower crankcase assembly of an embodiment of the present invention;

FIG. 3 illustrates a schematic structural view of an upper crankcase assembly of an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a piston mechanism according to an embodiment of the present invention;

FIG. 5 shows an exploded view of the structure of the load bearing part of the embodiment of the present invention;

FIG. 6 is a schematic view showing the structure of a recovery mechanism according to an embodiment of the present invention;

FIG. 7 shows a schematic structural view of a ventilation assembly of an embodiment of the present invention;

FIG. 8 is a schematic structural view showing a low-temperature gas injection part according to an embodiment of the present invention.

In the figure: 1. a lower crankcase assembly; 11. a first housing; 12. a first bearing housing; 13. a working chamber; 14. a first through hole; 15. a second through hole; 16. a third through hole; 17. a first bolt column; 2. an upper crankcase assembly; 21. a second housing; 22. a piston cavity; 23. a piston mechanism; 231. a piston cylinder; 232. a connecting rod; 233. a piston pin; 234. a fifth through hole; 235. a bearing part; 2351. an outer steel ring; 2352. a sixth through hole; 2353. a seventh via hole; 2354. stamping a plate; 2355. an inner steel ring; 2356. a heat conductive sheet; 2357. a heat-conducting column; 2358. a triangular prism flow guide block; 24. a fourth via hole; 25. a second bolt column; 26. a recovery mechanism; 261. a third housing; 262. an isolation frame; 263. a first check valve; 264. an air outlet cavity; 265. an air inlet cavity; 3. a ventilation assembly; 31. a fourth housing; 32. a negative pressure pump; 33. a docking valve; 34. a flow guide pipe; 35. an oil-gas separator; 36. an air intake duct; 37. a gas injection pipe; 38. a low-temperature gas injection part; 381. a fifth housing; 382. a fan; 383. a negative pressure hole; 384. a wind collecting cover; 385. an air exhaust hole; 39. oil unloading bent pipes; 310. a second one-way valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a sealed crankcase of an oil-free piston, which comprises a lower crankcase assembly 1, an upper crankcase assembly 2 and a ventilation assembly 3; illustratively, as shown in FIG. 1.

The top of lower crankcase subassembly 1 and the bottom fixed connection of last crankcase subassembly 2, just crankcase subassembly 1 and last crankcase subassembly 2 communicate each other down, ventilation assembly 3 fixed connection is in the same lateral wall of crankcase subassembly 1 and last crankcase subassembly 2 down, just ventilation assembly 3 communicates each other with lower crankcase subassembly 1 and last crankcase subassembly 2 respectively.

Further, a crankshaft connecting rod mechanism is rotatably connected in the lower crankcase assembly 1.

Further, a piston mechanism is rotatably connected in the upper crankcase assembly 2.

Specifically, the one end and the lower crankcase subassembly 1 intercommunication of ventilation subassembly 3, the other end and the 2 intercommunications of last crankcase subassembly, make the interior crankshaft connecting rod mechanism operation of crankcase subassembly 1 down, utilize ventilation subassembly 3 to inhale the gas in crankcase subassembly 1 down, and through ventilation subassembly 3 will accomodate the gas after the cooling and pour into the piston mechanism in last crankcase subassembly 2 again, when guaranteeing piston mechanism cooling operation, can pour into the remaining gas in the ventilation subassembly 3 into lower crankcase subassembly 1 again, make the ventilation efficiency of crankcase subassembly 1 down obtain promoting.

The lower crankcase assembly 1 comprises a first housing 11; illustratively, as shown in FIG. 2.

First casing 11 is open structure, first bearing frame 12 of a plurality of groups of inner wall fixedly connected with of first casing 11, a plurality of groups first bearing frame 12 is the equidistance and distributes at first casing 11's inner wall, and per two sets of be provided with working chamber 13 between the adjacent lateral wall of first bearing frame 12, a plurality of groups first through-hole 14 and a plurality of groups second through-hole 15 have been seted up respectively to first bearing frame 11's a lateral wall, and a plurality of groups first through-hole 14 and a plurality of groups second through-hole 15 all communicates each other with ventilation assembly 3, a plurality of groups the level of first through-hole 14 is located a plurality of groups the top of 15 level of second through-hole, a plurality of groups third through-hole 16 has been seted up respectively to another lateral wall of first casing 11, and a plurality of groups the level of third through-hole 16 is unanimous with the level of first through-hole 14, the first bolt post 17 of a plurality of groups of outer wall symmetry fixedly connected with of first casing 11.

Furthermore, a plurality of groups of the first bearing seats 12 are rotatably connected with a crankshaft connecting rod mechanism, and an output end of the crankshaft connecting rod mechanism extends into the working cavity 13.

Further, each group of the first through holes 14, each group of the second through holes 15, and each group of the third through holes 16 are communicated with each group of the working chambers 13.

Specifically, the first bearing seats 12 are used for bearing a crankshaft connecting rod mechanism, so that the crankshaft connecting rod mechanism is rotatably connected to each corresponding group of first bearing seats 12, and the output end of the crankshaft connecting rod mechanism extends into the first bearing seats through a plurality of groups of working cavities 13, so that the crankshaft connecting rod mechanism can work when running;

the plurality of groups of first through holes 14 and the plurality of groups of second through holes 15 are communicated with the ventilation assembly 3, the ventilation assembly 3 is used for recycling the gas in the first shell 11, and the oil contained in the recycled gas is injected into the first shell 11 through the second through holes 15 and used for recycling the gas in the first shell 11;

the third through hole 16 is used to communicate the air flows exhausted from the upper crankcase assembly 2 with each other and to inject the exhausted air flows into the first housing 11 again for the circulating ventilation of the first housing 11.

The upper crankcase assembly 2 includes a second housing 21, a piston mechanism 23, and a recovery mechanism 26; illustratively, as shown in FIG. 3.

The utility model discloses a ventilation assembly, including second casing 21, piston mechanism 21, crank shaft and piston rod mechanism, second casing 21 is open structure, a plurality of piston chamber 22 of group has been seted up on the top of second casing 21, and a plurality of groups the inner wall in piston chamber 22 all with piston mechanism 23 sliding connection, the one end of piston mechanism 23 extends to in the working chamber 13 and is connected with the transmission of crankshaft link mechanism, a plurality of groups fourth through-hole 24 has been seted up to a lateral wall of second casing 21, a plurality of groups fourth through-hole 24 is located the one side that is close to first through-hole 14, and a plurality of groups fourth through-hole 24 all communicates each other with piston chamber 22, a plurality of groups fourth through-hole 24 all communicates each other with ventilation assembly 3, the outer wall symmetry fixedly connected with a plurality of groups second bolt post 25 of second casing 21, retrieve mechanism 26 fixed connection in the outer wall of second casing 21 and keep away from one side of fourth through-hole 24, retrieve mechanism 26 and communicate each other with a plurality of groups third through-hole 16 and a plurality of groups piston chamber 22 respectively.

The piston mechanism 23 includes a piston cylinder 231 and a bearing portion 235; illustratively, as shown in FIG. 4.

The bottom end of the piston cylinder 231 is provided with a connecting rod 232, a piston pin 233 penetrates through the outer wall of the piston cylinder 231, one end of the connecting rod 232 is movably connected with the piston pin 233 in a penetrating manner, two sets of fifth through holes 234 are symmetrically formed in the outer walls of the two sides of the piston cylinder 231, the bearing part 235 is fixedly connected to the inner wall of the piston cylinder 231, and the bearing part 235 is communicated with the two sets of fifth through holes 234.

The carrier 235 comprises an outer steel ring 2351; illustratively, as shown in fig. 5.

A sixth through hole 2352 is formed in one side wall of the outer steel ring 2351, a seventh through hole 2353 is formed in the other side wall of the outer steel ring 2351, the sixth through hole 2352 and the seventh through hole 2353 are communicated with two groups of fifth through holes 234, a stamping plate 2354 is fixedly connected to the top end of the outer steel ring 2351, an inner steel ring 2355 is fixedly connected to the bottom end of the stamping plate 2354, a plurality of groups of heat-conducting sheets 2356 are fixedly connected to the inner wall of the inner steel ring 2355, the plurality of groups of heat-conducting sheets 2356 are arranged in an annular array around the central axis of the inner steel ring 2355, the plurality of groups of heat-conducting sheets 2356 are fixedly connected to a heat-conducting column 2357, the heat-conducting column 2357 and the plurality of groups of heat-conducting sheets 2356 are fixedly connected to the bottom end of the stamping central axis plate 2354, a triangular column flow-guiding block 2358 is fixedly connected to the outer wall of one side of the inner steel ring 2355, and the triangular column flow-guiding block 2358 coincides with the central axis of the seventh through hole 2353.

Further, an annular flow guide cavity is arranged between the outer steel ring 2351 and the inner steel ring 2355.

The recovery mechanism 26 includes a third housing 261; illustratively, as shown in FIG. 6.

The third casing 261 is an open structure, the inner wall fixedly connected with of third casing 261 has a plurality of groups to keep apart frame 262, the central axis position embedding of keeping apart frame 262 installs first check valve 263, the chamber 264 of giving vent to anger has been seted up to the one end of keeping apart frame 262, just the chamber 265 that admits air has been seted up to the other end of keeping apart frame 262, admit air chamber 265 communicate with seventh through-hole 2353 and a group of fifth through-hole 234 each other respectively, the chamber 264 of giving vent to anger communicates with third through-hole 16 each other.

Specifically, the fifth through hole 234 and the sixth through hole 2352 on one side are used in cooperation, so that the injected low-temperature gas is communicated, and the low-temperature gas is discharged outwards through the seventh through hole 2353 and the fifth through hole 234 on the other side in sequence under the action of the triangular prism flow guide block 2358 through the annular flow guide cavity formed by the outer steel ring 2351 and the inner steel ring 2355, so that the low-temperature gas is communicated and cooled in the piston cylinder 231;

the plurality of sets of heat-conducting fins 2356 are used in cooperation with the heat-conducting columns 2357 to help the bottom of the punch plate 2354 conduct heat, so that transferred heat is diffused to the surface of the inner steel ring 2355, and the heat dissipated by the inner steel ring 2355 is close to the annular flow-guiding cavity for the heat centralized cooling effect of the piston cylinder 231.

The air inlet cavity 265 receives the gas discharged outwards from the seventh through hole 2353 and the fifth through hole 234 on the other side, injects the gas into the air outlet cavity 264 through the first one-way valve 263, and returns the injected gas into the first shell 11 through the air outlet cavity 264 via the third through hole 16, so as to achieve the effect of circulation ventilation in the first shell 11.

The vent assembly 3 includes a fourth housing 31 and a low-temperature gas injection portion 38; exemplarily, as shown in fig. 7.

The inner wall top fixedly connected with negative pressure pump 32 of fourth casing 31, the inner wall bottom fixedly connected with butt joint valve 33 of fourth casing 31, be connected with honeycomb duct 34 between negative pressure pump 32 and the butt joint valve 33, just be provided with oil and gas separator 35 on the honeycomb duct 34, the outer wall of honeycomb duct 34 and the one side intercommunication that is close to butt joint valve 33 have breathing pipe 36, the one end and the first through-hole 14 of breathing pipe 36 communicate each other, the outer wall of honeycomb duct 34 and the one side intercommunication that is close to negative pressure pump 32 have gas injection pipe 37, just gas injection pipe 37 and fourth through-hole 24 communicate each other, low temperature gas injection portion 38 fixed connection is on gas injection pipe 37 and communicates each other, the bottom mounting and the intercommunication of butt joint valve 33 have oil discharge elbow 39, be provided with second check valve 310 on the oil discharge elbow 39, just the one end and the second through-hole 15 of oil discharge elbow 39 communicate each other.

Specifically, the continuous operation of the negative pressure pump 32 causes negative pressure to be generated at the port of the air suction pipe 36, so as to suck the gas in the first housing 11, the gas is subjected to oil-gas separation under the action of the oil-gas separator 35 when passing through the flow guide pipe 34, the redundant oil flows back into the first housing 11 through the oil discharge elbow 39, and the redundant gas stays in the flow guide pipe 34.

The low-temperature gas injection part 38 includes a fifth casing 381; illustratively, as shown in fig. 8.

The utility model discloses a fan 381, including fifth casing 381, fan 382, air-collecting cover 384, air-exhausting hole 385, air-collecting cover 384, fan 382's one side inner wall fixedly connected with fan 382, just negative pressure hole 383 that communicates each other with fan 382 is seted up to the outer wall of fifth casing 381, the inner wall of air-collecting cover 384 is the toper setting, just air-collecting cover 384's inner wall fixedly connected with a plurality of groups semiconductor refrigeration piece, air-collecting cover 384 is close to the opening diameter of fan 382 one end and is greater than the opening diameter of the other end.

Specifically, the negative pressure holes 383 and the exhaust holes 385 are used for communicating with the gas injection pipe 37, so that negative pressure is generated while the fan 382 rotates, gas in the flow guide pipe 34 is sucked and transmitted into the air collection cover 384, the temperature of the gas generated by the fan 382 is reduced by using a plurality of groups of semiconductor refrigeration sheets arranged on the inner wall of the air collection cover 384, and the low-temperature gas is transmitted to the gas injection pipe 37 through the exhaust holes 385.

The sealed crankcase of the oil-free piston provided by the embodiment of the invention has the following working principle:

the continuous work of the negative pressure pump 32 enables the port of the air suction pipe 36 to generate negative pressure, the gas in the first shell 11 is sucked, the gas is subjected to oil-gas separation under the action of the oil-gas separator 35 when passing through the flow guide pipe 34, redundant oil flows back into the first shell 11 through the oil discharge elbow pipe 39, and redundant gas stays in the flow guide pipe 34;

the negative pressure holes 383 and the exhaust holes 385 are used for communicating the gas injection pipe 37, so that negative pressure is generated while the fan 382 rotates, gas in the flow guide pipe 34 is sucked and transmitted into the air collection cover 384, the temperature of the gas generated by the fan 382 is reduced by utilizing a plurality of groups of semiconductor refrigeration sheets arranged on the inner wall of the air collection cover 384, and the low-temperature gas is transmitted to the gas injection pipe 37 through the exhaust holes 385;

when the piston cylinder 231 performs piston motion in the piston cavity 22, one group of the fifth through holes 234 is butted and communicated with the fourth through hole 24, and the other group of the fifth through holes 234 is butted and communicated with the air inlet cavity 265 in the third shell 261;

the plurality of groups of heat-conducting fins 2356 are used in cooperation with the heat-conducting columns 2357 to help the bottom of the punching plate 2354 conduct heat, so that the transferred heat is diffused to the surface of the inner steel ring 2355, and the heat dissipated by the inner steel ring 2355 is close to the annular flow guide cavity for the heat centralized cooling effect of the piston cylinder 231;

the fifth through hole 234 and the sixth through hole 2352 on one side are matched for use, so that the injected low-temperature gas is communicated, and the low-temperature gas is discharged outwards through the seventh through hole 2353 and the fifth through hole 234 on the other side in sequence under the action of the triangular prism flow guide block 2358 through the annular flow guide cavity formed by the outer steel ring 2351 and the inner steel ring 2355, and is used for cooling the low-temperature gas flowing through the piston cylinder 231;

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A sealed crankcase of an oil-free piston is characterized in that: comprises a lower crankcase assembly (1), an upper crankcase assembly (2) and a ventilation assembly (3);

the upper crankcase assembly (2) comprises a second housing (21), a piston mechanism (23) and a recovery mechanism (26); the top end of the second shell (21) is provided with a plurality of groups of piston cavities (22), the inner walls of the piston cavities (22) are in sliding connection with a piston mechanism (23), the recovery mechanism (26) is fixedly connected to the outer wall of the second shell (21), and the recovery mechanism (26) is respectively communicated with the lower crankcase assembly (1) and the piston cavities (22);

the piston mechanism (23) comprises a piston cylinder (231) and a bearing part (235); two groups of fifth through holes (234) are symmetrically formed in the outer walls of the two sides of the piston cylinder body (231), the bearing part (235) is fixedly connected to the inner wall of the piston cylinder body (231), and the bearing part (235) is communicated with the two groups of fifth through holes (234);

the carrier (235) comprises an outer steel ring (2351); a sixth through hole (2352) is formed in one side wall of the outer steel ring (2351), a seventh through hole (2353) is formed in the other side wall of the outer steel ring (2351), the sixth through hole (2352) and the seventh through hole (2353) are communicated with two groups of fifth through holes (234), a punching plate (2354) is fixedly connected to the top end of the outer steel ring (2351), an inner steel ring (2355) is fixedly connected to the bottom end of the punching plate (2354), a triangular prism flow guide block (2358) is fixedly connected to the outer wall of one side of the inner steel ring (2355), and the central axis of the triangular prism flow guide block (2358) is overlapped with the central axis of the seventh through hole (2353);

the top end of lower crankcase subassembly (1) and the bottom fixed connection of second casing (21), ventilation subassembly (3) fixed connection is in the same lateral wall of crankcase subassembly (1) and second casing (21) down, just ventilation subassembly (3) communicate with lower crankcase subassembly (1) and piston chamber (22) each other respectively.

2. An oil-free piston sealed crankcase as claimed in claim 1, wherein: the lower crankcase assembly (1) comprises a first housing (11);

first casing (11) are open structure, the inner wall fixedly connected with a plurality of first bearing frame (12) of group of first casing (11), a plurality of group first bearing frame (12) are the equidistance and distribute at the inner wall of first casing (11), and per two sets be provided with working chamber (13) between the adjacent lateral wall of first bearing frame (12).

3. A sealed crankcase for an oil-free piston as claimed in claim 2, wherein: a plurality of groups of first through holes (14) and a plurality of groups of second through holes (15) are respectively formed in one side wall of the first shell (11), the first through holes (14) and the plurality of groups of second through holes (15) are communicated with the ventilation assembly (3) respectively, the first through holes (14) are arranged in the plurality of groups of horizontal heights, the second through holes (15) are arranged at the top end of the horizontal height, a plurality of groups of third through holes (16) are respectively formed in the other side wall of the first shell (11), the horizontal height of the third through holes (16) is consistent with the horizontal height of the first through holes (14), and a plurality of groups of first bolt columns (17) are symmetrically and fixedly connected to the outer wall of the first shell (11).

4. A sealed crankcase for an oil-free piston as claimed in claim 1, wherein: a plurality of groups of fourth through holes (24) are formed in one side wall of the second shell (21), a plurality of groups of fourth through holes (24) are located on one side close to the first through hole (14), the fourth through holes (24) are communicated with the piston cavity (22), the fourth through holes (24) are communicated with the ventilation assembly (3), and a plurality of groups of second bolt columns (25) are symmetrically and fixedly connected to the outer wall of the second shell (21).

5. An oil-free piston sealed crankcase as claimed in claim 1, wherein: inner steel ring (2355) inner wall fixedly connected with a plurality of groups conducting strip (2356), a plurality of groups conducting strip (2356) is the setting of annular array with the axis of inner steel ring (2355) as the center, a plurality of groups the equal fixedly connected with heat conduction post (2357) of one end that conducting strip (2356) is close to inner steel ring (2355) axis, heat conduction post (2357) and a plurality of groups conducting strip (2356) all with the bottom fixed connection of punching press board (2354), be provided with cyclic annular water conservancy diversion chamber between outer steel ring (2351) and inner steel ring (2355).

6. A sealed crankcase for an oil-free piston as claimed in claim 1, wherein: the ventilation assembly (3) comprises a fourth shell (31) and a low-temperature gas injection part (38);

the oil-gas separator is characterized in that a negative pressure pump (32) is fixedly connected to the top end of the inner wall of the fourth shell (31), a butt valve (33) is fixedly connected to the bottom end of the inner wall of the fourth shell (31), a flow guide pipe (34) is connected between the negative pressure pump (32) and the butt valve (33), and an oil-gas separator (35) is arranged on the flow guide pipe (34).

7. A sealed crankcase for an oil-free piston as claimed in claim 6, wherein: one side of the outer wall of the flow guide pipe (34) and close to the butt joint valve (33) is communicated with an air suction pipe (36), one end of the air suction pipe (36) is communicated with the first through hole (14), one side of the outer wall of the flow guide pipe (34) and close to the negative pressure pump (32) is communicated with an air injection pipe (37), and the air injection pipe (37) is communicated with the fourth through hole (24).

8. An oil-free piston sealed crankcase as claimed in claim 7, wherein: low temperature gas injection portion (38) fixed connection just communicates each other on gas injection pipe (37), the bottom mounting and the intercommunication of butt joint valve (33) have oil discharge return bend (39), be provided with second check valve (310) on oil discharge return bend (39), just the one end and second through-hole (15) of oil discharge return bend (39) communicate each other.

9. An oil-free piston sealed crankcase as claimed in claim 8, wherein: the low-temperature gas injection part (38) includes a fifth shell (381);

the fan (382) is fixedly connected to the inner wall of one side of the fifth shell (381), the outer wall of the fifth shell (381) is provided with a negative pressure hole (383) communicated with the fan (382), the inner wall of the other side of the fifth shell (381) is fixedly connected with a wind collecting cover (384), and the outer wall of the fifth shell (381) is provided with an exhaust hole (385) communicated with the wind collecting cover (384).

10. An oil-free piston sealed crankcase as claimed in claim 9, wherein: the inner wall of the air collecting cover (384) is arranged in a conical shape, the inner wall of the air collecting cover (384) is fixedly connected with a plurality of groups of semiconductor refrigerating sheets, and the diameter of an opening, close to one end of the fan (382), of the air collecting cover (384) is larger than that of an opening at the other end of the air collecting cover.