CN112324512B

CN112324512B - Symmetrical expansion machine

Info

Publication number: CN112324512B
Application number: CN202011271476.0A
Authority: CN
Inventors: 何洋; 罗发游; 任丽萍; 吴飞; 万鹏凯
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-08-31
Anticipated expiration: 2040-11-13
Also published as: CN112324512A

Abstract

The present disclosure provides a symmetric expander, comprising: the air cylinder, the main shaft, the sliding sheet and the cover body are all coaxially arranged and have a common central axis, the main shaft comprises a first diameter part arranged in an air cylinder cavity of the air cylinder, the first diameter part is of a cylindrical structure, a first sliding sheet groove and a second sliding sheet groove are arranged on the first diameter part, and the second sliding sheet groove and the first sliding sheet groove are arranged in a central symmetry mode relative to the central axis; the sliding sheet comprises a first sliding sheet and a second sliding sheet; the cover body is arranged at one axial end of the first diameter part and comprises a body, bosses protruding towards the first diameter part are further arranged on the body, and the bosses comprise a first boss and a second boss which are centrosymmetric along a central axis; the cylinder, the first diameter part, the sliding sheet and the boss are enclosed to form an expansion cavity. According to the spindle, the spindle is not provided with an eccentric structure, a balance block is not required to be additionally arranged outside to offset unbalanced force, and the spindle is simple in structure and stable in operation process.

Description

Symmetrical expansion machine

Technical Field

The disclosure relates to the technical field of expanders, in particular to a symmetrical expander.

Background

In vapor compression refrigeration systems, throttling elements are important elements for maintaining the pressure differential between the condenser and the evaporator and for controlling the flow of the conditioning system, and throttling elements commonly used in domestic and commercial refrigeration equipment are throttling valves and capillary tubes. Whether a throttle valve or a capillary tube, the working principle is to utilize local resistance loss along the way to rapidly reduce the pressure of the refrigerant. Throttling losses are irreversible losses that reduce the thermodynamic integrity of the cycle. Theoretically, if a reversible adiabatic expansion process is used for replacing an irreversible isenthalpic throttling process, the entropy increase of a system can be reduced, and the thermodynamic perfection of the system is improved. The expander can theoretically realize reversible adiabatic expansion of the refrigerant, and realize energy recovery and utilization.

Patent numbers: CN104564678B discloses an expansion compressor device and an air conditioner with the same, which divides a cylinder into expansion chambers through the radial movement of a hinged slide sheet. Patent numbers: CN1934335A discloses a rotary expander which divides a cylinder in a radial direction into expansion chambers by oscillating rollers. Patent numbers: the CN101769166B two-stage rotor type expansion machine supports against the roller through the slide head, and divides the cylinder into expansion chambers in the radial direction. However, the above patents have the following problems: the crankshaft is in an eccentric structure, and a balance block needs to be additionally arranged outside to offset unbalanced force; the single-cylinder single-exhaust structure is easy to generate unbalanced force, so that the crankshaft is deformed; the minor axis diameter inhales, and the sealed face is little, easily produces the leakage.

Because the expander among the prior art exists because the bent axle is eccentric structure, needs outside additional balancing piece to offset technical problem such as unbalanced force, consequently this disclosure research designs a symmetrical expander.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that in the expansion machine in the prior art, because the crankshaft is an eccentric structure, a balance block needs to be additionally installed outside to counteract an unbalanced force, thereby providing a symmetric expansion machine.

In order to solve the above problem, the present disclosure provides a symmetric expander, comprising:

the air cylinder, the main shaft and the cover body are coaxially arranged and have a common central axis, the main shaft comprises a first diameter part arranged in a cylinder cavity of the air cylinder, the first diameter part is of a cylindrical structure, a first slide sheet groove and a second slide sheet groove are arranged on the first diameter part, and the second slide sheet groove and the first slide sheet groove are arranged in a central symmetry mode relative to the central axis;

the sliding pieces comprise first sliding pieces and second sliding pieces, the first sliding pieces are arranged in the first sliding piece grooves, and the second sliding pieces are arranged in the second sliding piece grooves;

the cover body is arranged at one axial end of the first diameter part and comprises a body, a boss protruding towards the first diameter part is further arranged on the body, and the boss comprises a first boss and a second boss which are centrosymmetric along the central axis; the cylinder, the first diameter part, the sliding sheet and the boss enclose an expansion cavity.

In some embodiments, the expansion chambers include a first expansion chamber located between the first vane and the first boss, and a second expansion chamber located between the second vane and the second boss, the first expansion chamber and the second expansion chamber being centrally symmetric along the central axis; or the expansion cavities comprise a third expansion cavity and a fourth expansion cavity, the third expansion cavity is located between the first sliding sheet and the second boss, the fourth expansion cavity is located between the second sliding sheet and the first boss, and the third expansion cavity and the fourth expansion cavity are in central symmetry along the central axis.

In some embodiments, the first vane groove is a groove that opens radially inward on a radially outer periphery of the first diameter portion, and the first vane groove extends in an axial direction to a first axial end face of the first diameter portion; the second vane groove is also a groove that is formed radially inward on the outer periphery of the first diameter portion in the radial direction, and the second vane groove also extends to the first axial end surface in the axial direction.

In some embodiments, the boss includes a boss end face abuttable with the first axial end face, the boss end face including a first boss end face on the first boss and a second boss end face on the second boss.

In some embodiments, the boss further includes a transition curved surface connected to the boss end surface, one end of the transition curved surface is connected to the body, the other end of the transition curved surface is connected to the boss end surface, and the transition curved surface is provided with an exhaust port which penetrates through the cover body along the axial direction of the cover body.

In some embodiments, the exhaust port is disposed proximate the boss end face relative to the body; and/or the transition curved surface is an arc-shaped surface; and/or when the slide sheet rotates to be opposite to the exhaust port on the transition curved surface, the exhaust port is communicated with the expansion cavity, and exhaust is started.

In some embodiments, the blend surface comprises a first blend surface located on the first boss and a second blend surface located on the second boss; the exhaust port includes being located first exhaust port on the first transition curved surface and being located second exhaust port on the second transition curved surface.

In some embodiments, the cover further includes a cylindrical protrusion, the cylindrical protrusion is disposed at the central axis of the body in a connected manner, the cylindrical protrusion is disposed coaxially with the body, the cylindrical protrusion abuts against the first axial end face, and the boss is located radially outside the cylindrical protrusion; the height of the end face of the boss is equal to that of the cylindrical protrusion.

In some embodiments, the main shaft includes a cylindrical second diameter portion, the first diameter portion further includes a second axial end surface at the other axial end thereof, the second diameter portion is contiguous with the second axial end surface, and an outer diameter of the second diameter portion is smaller than an outer diameter of the first diameter portion.

In some embodiments, an outer circumferential surface of the first diameter portion is disposed in close contact with an inner circumferential surface of the cylinder cavity; and/or the slide sheet is attached to the inner circumferential surface of the cylinder cavity.

In some embodiments, an end of the sliding piece is connected to the body between the two bosses when the sliding piece is not opposite to any boss, and an expansion chamber with gradually changing volume is formed between the bosses and the sliding piece along with the rotation of the main shaft.

In some embodiments, the first diameter portion further includes a second axial end surface, the first axial end surface is located at one axial end of the first diameter portion, the second axial end surface is located at the other axial end of the first diameter portion, the first diameter portion is further provided with a first air inlet channel and a second air inlet channel, the first air inlet channel penetrates from the first axial end surface to the second axial end surface, the second air inlet channel penetrates from the first axial end surface to the second axial end surface, and the first air inlet channel and/or the second air inlet channel can communicate with the expansion cavity during rotation of the main shaft.

In some embodiments, the first air intake passage is provided at a position between the first vane groove and the second vane groove in the circumferential direction, the second air intake passage is also provided at a position between the second vane groove and the first vane groove in the circumferential direction, and the first air intake passage and the second air intake passage are provided in central symmetry with respect to the central axis.

In some embodiments, the first air intake passage is disposed adjacent to the first vane slot relative to the second vane slot; the second air intake passage is disposed adjacent to the second vane slot with respect to the first vane slot.

In some embodiments, the axial length of the cylinder cavity is less than the axial length of the cylinder, the cylinder comprises a third axial end surface at one axial end thereof and a fourth axial end surface at the other axial end thereof, the cylinder cavity extends through from the third axial end surface to a cylinder inner end surface, the cylinder inner end surface is located between the third axial end surface and the fourth axial end surface;

an air inlet groove is formed in the inner end face of the air cylinder, one end of the air inlet groove is arranged on the inner end face of the air cylinder, and the other end of the air inlet groove extends towards the fourth axial end face; the air inlet groove can be communicated with the first air inlet channel or the second air inlet channel in the rotating process of the main shaft.

In some embodiments, an air inlet is further provided at the fourth axial end face, one end of the air inlet is provided on the fourth axial end face, and the other end of the air inlet extends towards the direction of the cylinder inner end face and is communicated with the air inlet groove.

In some embodiments, the cross section of the air inlet is a circular hole structure, and the cross section of the air inlet groove is an arc groove structure; the cross sections of the first air inlet channel and the second air inlet channel are both circular hole structures.

In some embodiments, the inlet slots include a first inlet slot and a second inlet slot, the inlet port includes a first inlet port and a second inlet port, the first inlet slot communicates with the first inlet port, the second inlet slot communicates with the second inlet port, the first inlet slot and the second inlet slot are disposed in central symmetry with respect to the central axis, and the first inlet port and the second inlet port are disposed in central symmetry with respect to the central axis.

The symmetrical expander provided by the disclosure has the following beneficial effects:

the first diameter part of the main shaft of the expansion machine is set to be a cylindrical structure to replace the original eccentric part, the first diameter part is provided with a first sliding sheet groove and a second sliding sheet groove which are centrosymmetric along the central axis, a cover body is provided with a first boss and a second boss which are centrosymmetric and protrude towards the first diameter part, a first expansion cavity is formed between the first sliding sheet and the first boss, a second expansion cavity is formed between the second sliding sheet and the second boss, or a third expansion cavity is formed between the first sliding sheet and the second boss, a fourth expansion cavity is formed between the second sliding sheet and the first boss, the first expansion cavity and the second expansion cavity are centrosymmetric, the third expansion cavity and the fourth expansion cavity are centrosymmetric, two mutually symmetric expansion cavity structures can be formed, no eccentric structure is arranged on the main shaft, a balance block is not required to be additionally arranged outside to offset unbalanced force, the structure is simple, and the operation process is more stable; in the single-cylinder double-expansion-cavity structure formed by the method, the two expansion cavities are symmetrically arranged, so that the balance force generated by the cavities to the main shaft can be offset, the expander can run more stably, and the crankshaft cannot deform due to the unbalance force; the exhaust ports are also more than two structures which are centrosymmetric, and the balance force which is symmetric to the main shaft can be further generated, so that the main shaft cannot deform, and the expansion machine can run more stably; the expansion cavity further sucks fluid from the end face of the first diameter part through the air inlet channel formed in the first diameter part to enter the expansion cavity for expansion, so that air suction from the shaft diameter of the short shaft of the crankshaft is effectively avoided, a plane seal is formed, the sealing surface is larger, an oil film is easy to generate, and leakage is effectively reduced or prevented; the part of this disclosure is few, the reliability is high.

Drawings

Fig. 1 is an exploded view of the expander of the present disclosure;

FIG. 2 is a schematic structural view of the main shaft in the expander of the present disclosure;

FIG. 3 is a schematic block diagram of a cylinder in the expander of the present disclosure;

fig. 4 is a schematic structural view of a cover body (lower cover) in the expander of the present disclosure;

FIG. 5 is a schematic diagram of the configuration of the suction and discharge passages in the expander of the present disclosure;

FIG. 6 is a schematic cross-sectional view of an expansion chamber in the expander of the present disclosure;

fig. 7 is a perspective view of the expander of the present disclosure with the cylinder removed.

The reference numerals are represented as:

1. a cylinder; 10. a cylinder cavity; 11. a third axial end face; 12. a fourth axial end face; 13. an inner end surface of the cylinder; 2. a main shaft; 21. a first diameter section; 211. a first slide groove; 212. a second slide groove; 213. a first axial end face; 214. a second axial end face; 22. a second diameter part; 3. sliding blades; 31. a first slip sheet; 32. a second slip sheet; 4. a cover body (or called a lower cover); 41. a body; 42. a cylindrical bulge; 43. a boss; 430. the end surface of the boss; 431. a first boss; 4310. a first boss end face; 432. a second boss; 4320. the end surface of the second boss; 433. a transition curved surface; 4331. a first transition curved surface; 4332. a second transition surface; 5. an expansion chamber; 51. a first expansion chamber; 52. a second expansion chamber; 6. an air intake passage; 61. a first air intake passage; 62. a second intake passage; 7. an air inlet groove; 71. a first air inlet groove; 72. a second air inlet groove; 8. an air inlet; 81. a first air inlet; 82. a second air inlet; 9. an exhaust port; 91. a first exhaust port; 92. a second exhaust port.

Detailed Description

As shown in fig. 1-7, the present disclosure provides a symmetric expander comprising:

the sliding vane structure comprises a cylinder 1, a main shaft 2, a sliding vane 3 and a cover body 4, wherein the cylinder 1, the main shaft 2 and the cover body 4 are coaxially arranged and have a common central axis, the main shaft 2 comprises a first diameter part 21 arranged in a cylinder cavity 10 of the cylinder 1, the first diameter part 21 is of a cylindrical structure, a first sliding vane groove 211 and a second sliding vane groove 212 are arranged on the first diameter part 21, and the second sliding vane groove 212 and the first sliding vane groove 211 are arranged in a central symmetry mode relative to the central axis;

the slide sheet 3 comprises a first slide sheet 31 and a second slide sheet 32, the first slide sheet 31 is arranged in the first slide sheet groove 211, and the second slide sheet 32 is arranged in the second slide sheet groove 212;

the cover 4 is disposed at one axial end of the first diameter portion 21, and the cover 4 includes a body 41, and a boss 43 protruding toward the first diameter portion 21 is further disposed on the body 41, and the boss 43 includes a first boss 431 and a second boss 432 that are centrosymmetric along the central axis;

the cylinder 1, the first diameter part 21, the sliding sheet 3 and the cover 4 enclose an expansion cavity: the expansion chambers include a first expansion chamber 51 between the first vane 31 and the first boss 431, and a second expansion chamber 52 between the second vane 32 and the second boss 432, the first expansion chamber 51 and the second expansion chamber 52 being centrally symmetrical along the central axis; alternatively, the expansion chambers include a third expansion chamber (not shown) between the first vane 31 and the second boss 432, and a fourth expansion chamber (not shown) between the second vane 32 and the first boss 431, the third and fourth expansion chambers being centrosymmetric along the central axis.

This is disclosed through the first diameter portion with the main shaft of expander set up to cylindric structure, replace original eccentric portion, and set up on first diameter portion and include along the central axis become centrosymmetric first slide groove and second slide groove, and set up on the lid towards convex first boss and the second boss of two centrosymmetric of first diameter portion, no eccentric structure setting on the main shaft, need not the outside balancing piece additional and offset unbalanced force, make simple structure, the operation process is more steady. And form first expansion chamber between first gleitbretter and the first boss, form second expansion chamber between second gleitbretter and the second boss, or form third expansion chamber between first gleitbretter and the second boss, form fourth expansion chamber between second gleitbretter and the first boss, first expansion chamber and second expansion chamber central symmetry, third expansion chamber and fourth expansion chamber central symmetry, can form two symmetrical expansion chamber structures each other, the double expansion chamber structure of single cylinder that this disclosure formed, two expansion chamber symmetries set up, make the balancing force that the cavity produced the main shaft offset, the expander operation is more steady, can not produce the unbalance force, lead to the bent axle to take place to warp.

In some embodiments, the first vane groove 211 is a groove opened radially inward on the radial outer periphery of the first diameter portion 21, and the first vane groove 211 extends in the axial direction to a first axial end surface 213 of the first diameter portion 21; the second vane groove 212 is also a groove that is opened radially inward on the radially outer periphery of the first diameter portion 21, and the second vane groove 212 also extends in the axial direction to the first axial end surface 213. This is the preferred structural style of first sliding vane groove and second sliding vane groove of this disclosure, through radially inwards offering at the radial periphery of first diameter portion, and extend to first axial terminal surface along the axial direction, can make the gleitbretter radially carry out the butt with the cylinder inner periphery, form effectual sealed between the circumference both sides of gleitbretter, and can make the gleitbretter reach on the body of the lid of bottom along the axial through first axial terminal surface, effectively and the boss between form the structure in the circumference in the expansion chamber, accomplish the effect to the inflation step-down of gas, and two expansion chamber structures of two centrosymmetries are formed to both sides to two gleitbretters, no off-centre, can not produce unbalanced force, the expander operation is more steady.

In some embodiments, said boss 43 comprises a boss end face 430 abuttable with said first axial end face 213, said boss end face comprising a first boss end face 4310 on said first boss 431 and a second boss end face 4320 on said second boss 432. This is this is this disclosed boss's further preferred structural style, can make through the setting of boss terminal surface and form effectual butt effect between the first axial terminal surface of first diameter portion, guarantee that the gas channeling can not take place between the inflation chamber of boss terminal surface circumference both sides, guarantee effectual sealed effect, guarantee the effectual inflation of gas in the inflation chamber, just make inflation chamber and gas vent intercommunication when the gleitbretter is promoted to the position of gas vent by gaseous pressure along circumference, and the gas discharge after will expanding.

In some embodiments, the boss 43 further includes a curved transitional surface 433 connected to the boss end surface 430, one end of the curved transitional surface 433 is connected to the body 41, the other end of the curved transitional surface 433 is connected to the boss end surface 430, and an air outlet 9 is disposed on the curved transitional surface 433, and the air outlet 9 penetrates through the cover 4 along the axial direction of the cover 4. This is disclosed still through the transition curved surface of being connected with the boss terminal surface, can make the gleitbretter along main shaft pivoted in-process via transition curved surface by jack-up, along upward movement in the gleitbretter groove, until by the position of top to the gas vent, when the gleitbretter moved the position of gas vent, gas vent and the inside intercommunication of expansion chamber, make the expansion chamber carry out the exhaust effect, in the gleitbretter moved the peak (being the boss terminal surface) when being pushed up completely, make the gleitbretter begin to get into the expansion chamber of the opposite side of boss terminal surface, get into next one and admit air, the inflation stage.

In some embodiments, the exhaust port 9 is disposed proximate to the boss end face 430 relative to the body 41; and/or the transition curved surface 433 is an arc-shaped surface; and/or when the sliding sheet 3 rotates to be opposite to the exhaust port 9 on the transition curved surface 433, the exhaust port 9 is communicated with the expansion cavity, and exhaust is started. The expansion cavity is communicated with the exhaust port and exhausts air until the sliding sheet rotates to a position close to the end face of the boss in the rotating process by the mode that the exhaust port is arranged close to the end face of the boss, so that the circumferential distance of expansion is prolonged to the maximum extent, the expansion volume is increased, and the expansion effect of the expansion cavity is improved; the transition curved surface is an arc-shaped surface and can gradually jack the sliding sheet in the rotating process of the sliding sheet, so that the sliding sheet is gradually jacked until the sliding sheet is completely jacked into the sliding sheet groove, the end surface of the boss is attached to the lower end surface of the first diameter part of the main shaft at the moment, the main shaft further rotates, and the sliding sheet falls into the next expansion cavity; when the slide sheet rotates to the opposite position of the exhaust port, the exhaust port is effectively communicated with the expansion cavity in the next second, and the effect of exhausting the gas in the expansion cavity through the exhaust port is achieved.

When the vane 3 is located between the first boss 431 and the second boss 432, the exhaust port 9 is located at a downstream side of the rotation direction of the vane 3, and the intake passage is located at an upstream side of the rotation direction of the vane 3.

In some embodiments, the blend surface 433 includes a first blend surface 4331 located on the first boss 431, and a second blend surface 4332 located on the second boss 432; the exhaust ports 9 include a first exhaust port 91 located on the first curved transitional surface 4331 and a second exhaust port 92 located on the second curved transitional surface 4332. The transition curved surface is a further preferable structural form of the transition curved surface, namely, the first transition curved surface on the first boss, the second transition curved surface on the second boss, the first exhaust port on the first transition curved surface and the second exhaust port on the second transition curved surface enable the two expansion cavities to be communicated to the exhaust ports through the transition curved surfaces symmetrically and respectively, and effective exhaust is achieved.

In some embodiments, the cover 4 further includes a cylindrical protrusion 42, the cylindrical protrusion 42 is disposed at the central axis of the body 41, the cylindrical protrusion 42 is disposed coaxially with the body 41, the cylindrical protrusion 42 abuts against the first axial end surface 213, and the boss 43 is located radially outside the cylindrical protrusion 42; the height of the boss end surface 430 is equal to the height of the cylindrical protrusion 42. Can make the lid carry out the butt with the lower terminal surface of first diameter portion effectively through the cylinder arch, form the ascending accommodation space of axial between gleitbretter and the boss, be convenient for form the inflation chamber, the boss is located the bellied radial outside of cylinder, and the height of boss terminal surface equals with the bellied height of cylinder, can support terminal surface under the main shaft jointly through the cylinder arch with the boss terminal surface, and the boss terminal surface is used for carrying out effectual sealed isolation to the inflation chamber of its circumference both sides.

Fig. 4 is a schematic view of a lower cover (cover body 4), wherein the small cylinders (cylindrical protrusions 42) of the lower cover have the same height as the end faces of the bosses, the bosses are arranged on the lower cover, the number of the bosses corresponds to the number of the sliding pieces, and an exhaust port is arranged on one side of each boss for exhausting expanded fluid out of the cavity.

In some embodiments, the main shaft 2 includes a cylindrical second diameter portion 22, the first diameter portion 21 further includes a second axial end surface 214 at the other axial end thereof, the second diameter portion 22 is connected to the second axial end surface 214, and the outer diameter of the second diameter portion 22 is smaller than the outer diameter of the first diameter portion 21. This is disclosed to be less than first diameter portion through cylindric second diameter portion, its diameter for this second diameter portion can be driven by first diameter portion and rotate and output power, and the second diameter portion can effectively wear to locate in the cylinder chamber.

Fig. 1 is an exploded view of the present invention, including a main shaft, a cylinder, a slide, and a lower cover.

FIG. 2 is a schematic view of a spindle of the present invention having two or an even number of vane slots with a corresponding number of inlet passages. The main shaft consists of a large cylinder and a small cylinder, the large cylinder of the main shaft is arranged in the cylinder, and the small cylinder is arranged outside the cylinder and serves as a power output shaft.

In some embodiments, the outer circumferential surface of the first diameter portion 21 is disposed in close contact with the inner circumferential surface of the cylinder chamber 10; and/or the sliding sheet 3 is attached to the inner circumferential surface of the cylinder cavity 10. The outer peripheral surface of the first diameter portion is attached to the inner peripheral surface of the cylinder cavity, the outer peripheral surface of the first diameter portion can be in sealing connection with the cylinder cavity, the sliding sheet is attached to the cylinder cavity, the sliding sheet can be in sealing connection with the cylinder cavity, gas leakage between the sliding sheet and the cylinder cavity is prevented, and the sealing performance of gas in expansion cavities on two sides of the circumferential direction of the sliding sheet is guaranteed.

In some embodiments, when the sliding piece 3 is not opposite to any boss 43, one end of the sliding piece 3 is connected with the body 41 between the two bosses 43, and an expansion cavity with gradually changing volume is formed between the bosses 43 and the sliding piece 3 along with the rotation of the main shaft 2. This is the further preferred structural style of this disclosure, and the gleitbretter is not opposite with the boss, and namely the gleitbretter is located between first and the second boss, and the gleitbretter makes its lower extreme butt on the body of boss because of the effect of gravity, forms the expansion chamber that the volume progressively increases between the boss and the rear end of gleitbretter direction of motion this moment (because the gas gets into the expansion chamber and expands the effect).

In some embodiments, the first diameter portion 21 further includes a second axial end surface 214, the first axial end surface 213 is located at one axial end of the first diameter portion 21, the second axial end surface 214 is located at the other axial end of the first diameter portion 21, and the first diameter portion 21 is further provided with a first air intake channel 61 and a second air intake channel 62, the first air intake channel 61 penetrates from the first axial end surface 213 to the second axial end surface 214, the second air intake channel 62 penetrates from the first axial end surface 213 to the second axial end surface 214, and the first air intake channel and/or the second air intake channel can communicate with the expansion chamber during rotation of the main shaft. Through the first air inlet channel and the second air inlet channel which are arranged on the first diameter portion, air can be fed from one side of the main shaft through the air inlet channels, and the air is intermittently communicated with the expansion cavity in the rotating process of the main shaft and is led into the expansion cavity to form expansion. The expansion cavity further sucks fluid from the end face of the first diameter part through the air inlet channel formed in the first diameter part to enter the expansion cavity for expansion, so that air suction from the shaft diameter of the short shaft of the crankshaft is effectively avoided, a plane seal is formed, the sealing surface is larger, an oil film is easy to generate, and leakage is effectively reduced or prevented; the part of this disclosure is few, the reliability is high.

In some embodiments, the first intake passage 61 is provided at a position between the first vane groove 211 and the second vane groove 212 in the circumferential direction, the second intake passage 62 is also provided at a position between the second vane groove 212 and the first vane groove 211 in the circumferential direction, and the first intake passage 61 and the second intake passage 62 are provided in central symmetry with respect to the central axis. And the air inlet channel of the expansion machine is also more than two structures with central symmetry, and can further generate balance force symmetrical to the main shaft, so that the main shaft cannot deform, and the expansion machine can run more stably

In some embodiments, the first air intake passage 61 is disposed adjacent to the first vane slot 211 with respect to the second vane slot 212; the second intake passage 62 is disposed adjacent to the second vane groove 212 with respect to the first vane groove 211. The first air inlet channel and the second air inlet channel are preferably arranged, namely the first air inlet channel is arranged close to the first slide sheet groove, so that the slide sheet can enter the next expansion cavity through the first air inlet channel after passing through the boss, and the clearance volume is prevented from being generated or reduced; the second air inlet channel is arranged close to the second sliding sheet groove, so that the sliding sheet can enter air through the second air inlet channel after passing through the boss and entering the next expansion cavity, and the clearance volume is prevented from being generated or reduced.

In some embodiments, the axial length of the cylinder cavity 10 is smaller than the axial length of the cylinder 1, the cylinder 1 comprises a third axial end surface 11 at one axial end thereof and a fourth axial end surface 12 at the other axial end thereof, the cylinder cavity 10 penetrates from the third axial end surface 11 to a cylinder inner end surface 13, and the cylinder inner end surface 13 is located between the third axial end surface 11 and the fourth axial end surface 12;

an air inlet groove 7 is formed in the cylinder inner end surface 13, one end of the air inlet groove 7 is arranged on the cylinder inner end surface 13, and the other end of the air inlet groove 7 extends towards the fourth axial end surface 12; the intake duct 7 can communicate with the first intake passage 61 or the second intake passage 62 during rotation of the main shaft 2.

This is disclosed through the structural style of special cylinder for the cylinder chamber does not run through two axial terminal surfaces of cylinder completely, has cylinder inner end face, and the first diameter portion butt of main shaft is on this cylinder inner end face, is used for setting up the air inlet duct between cylinder inner end face to the fourth axial terminal surface, and the air inlet duct admits air from axial one side of cylinder, and then gets into first and/or second inlet channel in the main shaft rotation in-process, accomplishes and admits air.

In some embodiments, an intake port 8 is further disposed at the fourth axial end surface 12, one end of the intake port 8 is disposed on the fourth axial end surface 12, and the other end of the intake port 8 extends toward the cylinder inner end surface 13 and communicates with the intake groove 7. The present disclosure provides for the arrangement of the gas inlet such that the gas inlet draws in gas from the outside through the fourth axial end face, via the gas inlet channel, further into the first and/or gas inlet channel.

In some embodiments, the cross section of the air inlet 8 is a circular hole structure, and the cross section of the air inlet groove 7 is an arc groove structure; the cross sections of the first air intake passage 61 and the second air intake passage 62 are both circular hole structures. The connection form of air inlet and air inlet duct is set to the round hole structure with the air inlet, conveniently admits air for this disclosure, and the air inlet duct sets to the structure of arc wire casing, through the ascending radian in circumference of arc wire casing, can make when lieing in first or second inlet channel intercommunication, have a intercommunication radian (distance), for angle of admitting air (time) promptly.

FIG. 3 is a schematic view of the cylinder of the present invention, wherein the cylinder is provided with an air inlet and an air inlet groove, the air inlet is located outside the cylinder, and the air inlet groove is located inside the cylinder and is matched with the air inlet channel on the main shaft to suck fluid during assembly. The air inlet amount is controlled through the angle of the air inlet groove, the larger the angle of the air inlet groove is, the later the air inlet channel is separated from the air inlet groove, and the larger the air inlet amount is.

In some embodiments, the inlet slot 7 comprises a first inlet slot 71 and a second inlet slot 72, the inlet 8 comprises a first inlet 81 and a second inlet 82, the first inlet slot 71 communicates with the first inlet 81, the second inlet slot 72 communicates with the second inlet 82, the first inlet slot 71 and the second inlet slot 72 are arranged in central symmetry with respect to the central axis, and the first inlet 81 and the second inlet 82 are arranged in central symmetry with respect to the central axis. The air inlet is also more than two structures with central symmetry, and can further generate balance force symmetrical to the main shaft, so that the main shaft cannot deform, and the expansion machine operates more stably; the air inlet grooves are also more than two structures with central symmetry, and can further generate balance force symmetrical to the main shaft, so that the main shaft cannot deform, and the expander can run more stably.

FIG. 5 is a schematic view of the suction and discharge passages. Fig. 6 is a sectional view of the expansion chamber, the end face of the boss is equal to the end face of the small cylinder (cylindrical protrusion 42) of the lower cover, and the main shaft, the cylinder, the lower cover and the slide sheet jointly enclose the expansion chamber of the expansion machine.

And (3) air inlet process: fluid gets into the air inlet duct from the cylinder air inlet, and along with the rotation of main shaft, when inlet channel and air inlet duct UNICOM, inlet channel and air inlet duct UNICOM this moment, fluid gets into inlet channel from the air inlet duct, later along inlet channel entering expansion chamber. (the length of the first diameter part of the main shaft in the axial direction is smaller than the axial length of the cylinder inner cavity)

And (3) an expansion process: along with the rotation of the main shaft, the air inlet channel is separated from the air inlet groove, air suction is finished, fluid does not enter at the moment, the fluid in the expansion cavity expands, the main shaft is pushed to start to do work, and after expansion is finished, the next sliding sheet pushes the expanded fluid in the previous expansion cavity out of the air cylinder from the air outlet.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A symmetric expander, characterized by: the method comprises the following steps:

the sliding vane type air compressor comprises an air cylinder (1), a main shaft (2), a sliding vane (3) and a cover body (4), wherein the air cylinder (1), the main shaft (2) and the cover body (4) are coaxially arranged and have a common central axis, the main shaft (2) comprises a first diameter part (21) arranged in an air cylinder cavity (10) of the air cylinder (1), the first diameter part (21) is of a cylindrical structure, a first sliding vane groove (211) and a second sliding vane groove (212) are arranged on the first diameter part (21), and the second sliding vane groove (212) and the first sliding vane groove (211) are arranged in a central symmetry mode relative to the central axis;

the sliding piece (3) comprises a first sliding piece (31) and a second sliding piece (32), the first sliding piece (31) is arranged in the first sliding piece groove (211), and the second sliding piece (32) is arranged in the second sliding piece groove (212); the first vane (31) and the second vane (32) both slide in the axial direction of the first diameter portion (21);

the cover body (4) is arranged at one axial end of the first diameter portion (21), the cover body (4) comprises a body (41), a boss (43) protruding towards the first diameter portion (21) is further arranged on the body (41), and the boss (43) comprises a first boss (431) and a second boss (432) which are centrosymmetric along the central axis; the cylinder (1), the first diameter part (21), the sliding sheet (3) and the boss (43) enclose an expansion cavity;

the first slide groove (211) is a groove that is opened radially inward on the outer periphery of the first diameter portion (21) in the radial direction, and the first slide groove (211) extends in the axial direction to a first axial end surface (213) of the first diameter portion (21); the boss (43) comprises a boss end face (430) capable of abutting against the first axial end face (213), the cover body (4) further comprises a cylindrical protrusion (42), the cylindrical protrusion (42) is connected and arranged at the central axis of the body (41), the cylindrical protrusion (42) is arranged coaxially with the body (41), the cylindrical protrusion (42) abuts against the first axial end face (213), and the boss (43) is closely abutted against the radial outer side of the cylindrical protrusion (42); the height of the boss end surface (430) is equal to the height of the cylindrical protrusion (42).

2. The symmetric expander according to claim 1, wherein:

the expansion chambers include a first expansion chamber (51) between the first vane (31) and the first boss (431), and a second expansion chamber (52) between the second vane (32) and the second boss (432), the first expansion chamber (51) and the second expansion chamber (52) being centrosymmetric along the central axis; alternatively, the expansion chambers include a third expansion chamber between the first vane (31) and the second boss (432), and a fourth expansion chamber between the second vane (32) and the first boss (431), the third and fourth expansion chambers being centrosymmetric along the central axis.

3. The symmetrical expander according to claim 1 or 2, wherein:

the second vane groove (212) is also a groove that is open radially inward on the radially outer periphery of the first diameter portion (21), and the second vane groove (212) also extends in the axial direction to the first axial end surface (213).

4. The symmetric expander according to claim 3, wherein:

the boss end faces include a first boss end face (4310) located on the first boss (431) and a second boss end face (4320) located on the second boss (432).

5. The symmetric expander according to claim 4, wherein:

boss (43) still include with boss terminal surface (430) meet transition curved surface (433), the one end of transition curved surface (433) with body (41) are connected, the other end with boss terminal surface (430) are connected, just be provided with gas vent (9) on transition curved surface (433), gas vent (9) along the axial direction of lid (4) runs through lid (4).

6. The symmetric expander according to claim 5, wherein:

the exhaust port (9) is provided close to the boss end face (430) with respect to the body (41); and/or the transition curved surface (433) is an arc-shaped surface; and/or when the sliding sheet (3) rotates to be opposite to the exhaust port (9) on the transition curved surface (433), the exhaust port (9) is communicated with the expansion cavity, and exhaust is started.

7. The symmetric expander according to claim 5, wherein:

the blend surface (433) comprises a first blend surface (4331) located on the first boss (431) and a second blend surface (4332) located on the second boss (432); the exhaust port (9) comprises a first exhaust port (91) located on the first transition curved surface (4331) and a second exhaust port (92) located on the second transition curved surface (4332).

8. The symmetric expander according to claim 3, wherein:

the main shaft (2) comprises a cylindrical second diameter part (22), the first diameter part (21) further comprises a second axial end face (214) located at the other end of the axial direction of the first diameter part, the second diameter part (22) is connected with the second axial end face (214), and the outer diameter of the second diameter part (22) is smaller than that of the first diameter part (21).

9. The symmetric expander according to any one of claims 1-2, wherein:

the outer peripheral surface of the first diameter part (21) is attached to the inner peripheral surface of the cylinder cavity (10); and/or the sliding sheet (3) is attached to the inner circumferential surface of the cylinder cavity (10).

10. The symmetric expander according to any one of claims 1-2, wherein:

when the sliding vane (3) is not opposite to any boss (43), one end of the sliding vane (3) is connected with the body (41) between the two bosses (43), and an expansion cavity with gradually changed volume is formed between the bosses (43) and the sliding vane (3) along with the rotation of the main shaft (2).

11. The symmetric expander according to claim 3, wherein:

the first diameter portion (21) further comprises a second axial end face (214), the first axial end face (213) is located at one axial end of the first diameter portion (21), the second axial end face (214) is located at the other axial end of the first diameter portion (21), a first air inlet channel (61) and a second air inlet channel (62) are further arranged on the first diameter portion (21), the first air inlet channel (61) penetrates through the second axial end face (214) from the first axial end face (213), the second air inlet channel (62) penetrates through the second axial end face (214) from the first axial end face (213), and the first air inlet channel and/or the second air inlet channel can be communicated with the expansion cavity in the rotating process of the main shaft.

12. The symmetric expander according to claim 11, wherein:

the first intake passage (61) is provided at a position between the first vane groove (211) and the second vane groove (212) in the circumferential direction, the second intake passage (62) is also provided at a position between the second vane groove (212) and the first vane groove (211) in the circumferential direction, and the first intake passage (61) and the second intake passage (62) are provided in central symmetry with respect to the central axis.

13. The symmetric expander according to claim 11, wherein:

the first intake passage (61) is disposed adjacent to the first vane groove (211) with respect to the second vane groove (212); the second intake passage (62) is disposed adjacent to the second vane groove (212) with respect to the first vane groove (211).

14. The symmetric expander according to claim 11, wherein:

the axial length of the cylinder cavity (10) is smaller than that of the cylinder (1), the cylinder (1) comprises a third axial end face (11) located at one axial end of the cylinder and a fourth axial end face (12) located at the other axial end of the cylinder, the cylinder cavity (10) penetrates from the third axial end face (11) to a cylinder inner end face (13), and the cylinder inner end face (13) is located between the third axial end face (11) and the fourth axial end face (12);

an air inlet groove (7) is formed in the inner end face (13) of the air cylinder, one end of the air inlet groove (7) is arranged on the inner end face (13) of the air cylinder, and the other end of the air inlet groove (7) extends towards the fourth axial end face (12); the air inlet groove (7) can be communicated with the first air inlet channel (61) or the second air inlet channel (62) in the rotation process of the main shaft (2).

15. The symmetric expander according to claim 14, wherein:

an air inlet (8) is further formed in the position of the fourth axial end face (12), one end of the air inlet (8) is arranged on the fourth axial end face (12), and the other end of the air inlet (8) extends towards the direction of the inner end face (13) of the air cylinder and is communicated with the air inlet groove (7).

16. The symmetric expander according to claim 15, wherein:

the cross section of the air inlet (8) is of a circular hole structure, and the cross section of the air inlet groove (7) is of an arc groove structure; the cross sections of the first air inlet channel (61) and the second air inlet channel (62) are both circular hole structures.

17. The symmetric expander according to claim 15, wherein:

the air inlet groove (7) comprises a first air inlet groove (71) and a second air inlet groove (72), the air inlet (8) comprises a first air inlet (81) and a second air inlet (82), the first air inlet groove (71) is communicated with the first air inlet (81), the second air inlet groove (72) is communicated with the second air inlet (82), the first air inlet groove (71) and the second air inlet groove (72) are arranged in central symmetry relative to the central axis, and the first air inlet (81) and the second air inlet (82) are arranged in central symmetry relative to the central axis.