Air floatation system

Abstract

The application relates to the technical field of alternating flow systems, and discloses an air floatation system which comprises a main cylinder, a high-pressure gas reservoir, a low-pressure gas reservoir and an independent air pump, a first air gap is left between a main cylinder piston and the inner wall of a main cylinder cylinder barrel; the inner wall of the main cylinder cylinder barrel is provided with two spaced air return structures along the axial direction of the main cylinder cylinder barrel, the first air gap is communicated with the low-pressure gas reservoir through the air return structures; the inner wall of the main cylinder cylinder barrel is provided with two spaced air supply structures between the two air return structures, the first air gap is communicated with the high-pressure gas reservoir through the air supply structures; the air pump piston of the independent air pump divides the inner cavity of the air pump cylinder barrel into an air pump front cavity and an air pump back cavity, the high-pressure gas reservoir and the low-pressure gas reservoir are communicated with the air pump front cavity or the air pump back cavity through one-way valves, so that the gas enters the high-pressure gas reservoir from the independent air pump or the gas enters the independent air pump from the low-pressure gas reservoir. The air floatation system avoids the abrasion between the main cylinder piston and the main cylinder cylinder barrel during the starting process of the main cylinder by arranging the independent air pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of alternating flow system, in particular to a gas bearing system. BACKGROUND

[0002] Thermoacoustic generator and refrigerator, Stirling generator and refrigerator, pulse tube refrigerator, etc. all belong to alternating flow system, and the energy exchange between these systems and the outside world usually needs to be realized through the piston of a linear motor: in the generator, the fluid pushes the piston to move and then converts the mechanical energy into electrical energy; in the refrigerator, the motor converts electrical energy into mechanical energy and then pushes the gas to move through the piston. In these systems, the piston is sometimes also used as a regulating mechanism for the sound field inside the system, so that the system obtains better heat-to-work conversion effect. Since the lubricating oil in these systems will seriously deteriorate the performance of the system, the piston is usually supported by the gas bearing to eliminate the mechanical wear between the piston and the cylinder, and at the same time achieve the effect of gap sealing.

[0003] In the existing small-power motor, a high-pressure cavity is designed on the cylinder piston, and a one-way valve is arranged between the end face of the cylinder towards the front cavity and the high-pressure cavity, so that the gas flow can only flow from the front cavity to the high-pressure cavity. A gas supply channel is designed between the high-pressure cavity and the sealed air gap. After the system is operated, the piston starts to reciprocate, and the front cavity and the back cavity will have pressure fluctuations. When the pressure in the front cavity rises to a certain value, the one-way valve opens, and the gas flow enters the high-pressure cavity from the front cavity; when the pressure in the front cavity is less than a certain value, the one-way valve closes, so that with the reciprocating movement of the piston, the pressure in the high-pressure cavity gradually rises. The gas flow in the high-pressure cavity is injected into the sealed air gap through the gas supply pipeline, and a high-pressure gas film is formed in the air gap to support the piston and prevent mechanical wear between the piston and the cylinder. Such a gas bearing structure has several deficiencies: first, the gas in the high-pressure cavity comes from the front cavity, and after passing through the gas film, part of it flows back to the front cavity and part of it flows to the back cavity, which easily causes the average pressure in the front cavity and the back cavity to be unbalanced, thereby causing the piston to drift; second, when the piston is just started, the high-pressure gas film has not been formed, and at this time the wear between the piston and the cylinder is inevitable. In small-power systems, such wear is relatively slight, but when the power increases and the mass of the piston is larger, the wear between the piston and the cylinder will become more and more serious, thereby shortening the service life of the system, and it is not suitable for high-power systems. SUMMARY

[0004] The embodiment of the present application provides a gas bearing system to solve the problem that the existing gas bearing system easily causes the pressure in the cavity of the system to be unbalanced and is not suitable for high-power systems, so as to improve the performance of the gas bearing system.

[0005] The embodiment of the present application provides a kind of air floatation system, including main air cylinder and the high-pressure gas reservoir, low-pressure gas reservoir and independent air pump being arranged in the main air cylinder, the main air cylinder includes main air cylinder cylinder and the main air cylinder piston being installed in the main air cylinder cylinder, first air gap is left between the main air cylinder piston and the inner wall of the main air cylinder cylinder;Two interval gas return structures are configured along the axial direction of the main air cylinder cylinder, and the first air gap is communicated with the low-pressure gas reservoir through the gas return structure;Two interval gas supply structures are configured between the two gas return structures in the inner wall of the main air cylinder cylinder, and the first air gap is communicated with the high-pressure gas reservoir through the gas supply structure;

[0006] The independent air pump includes air pump cylinder and air pump piston installed in the air pump cylinder, the air pump piston divides the inner cavity of the air pump cylinder into air pump front cavity and air pump back cavity, the high-pressure gas reservoir and the low-pressure gas reservoir are communicated with the air pump front cavity or the air pump back cavity through one-way valve, so that gas enters the high-pressure gas reservoir from the independent air pump, or gas enters the independent air pump from the low-pressure gas reservoir.

[0007] Wherein, the gas return structure is annular gas return groove arranged along the circumference of the main air cylinder cylinder.

[0008] Wherein, the gas return groove is connected to the low-pressure gas reservoir through the gas return flow channel arranged in the main air cylinder cylinder.

[0009] Wherein, the gas inlet structure is a plurality of gas supply holes arranged along the circumference of the main air cylinder cylinder.

[0010] Wherein, the annular gas supply main circuit is arranged in the main air cylinder cylinder, the gas supply main circuit is communicated with the high-pressure gas reservoir, and a plurality of gas supply holes are communicated with the gas supply main circuit through one-to-one corresponding gas supply branch.

[0011] Wherein, the two end faces of the main air cylinder piston are respectively provided with first centering holes, the first centering holes are communicated with the first air gap, and correspond to the gas return groove.

[0012] Wherein, the second air gap is left between the air pump piston and the inner wall of the air pump cylinder, the air pump piston is provided with piston air cavity communicated with the second air gap, and the air pump front cavity is communicated with the piston air cavity through air pump one-way valve, so that gas enters the piston air cavity from the air pump front cavity.

[0013] Wherein, the inner wall of the air pump cylinder is provided with annular centering groove in the circumferential direction, and the centering groove corresponds to the balance position of the air pump piston.

[0014] The second air gap is communicated with the air pump back cavity through the centering groove, and the air pump piston is provided with a third centering hole at one end thereof facing the air pump front cavity, the third centering hole is communicated with the second air gap and corresponds to the centering groove.

[0015] The second air gap is communicated with the air pump back cavity through the centering groove, and the air pump piston is provided with a third centering hole at one end thereof facing the air pump front cavity, the third centering hole is communicated with the second air gap and corresponds to the centering groove.

[0016] The number of the main air cylinders is multiple, and the first air gap of each main air cylinder is communicated with the low-pressure gas reservoir through a respective gas return structure and with the high-pressure gas reservoir through a respective gas supply structure.

[0017] The air floating system provided by the embodiment of the present application comprises a main air cylinder, a high-pressure gas reservoir, a low-pressure gas reservoir and an independent air pump. When the air pump piston of the independent air pump moves, the pressure in the air pump front cavity and the air pump back cavity changes. When the pressure of the side cavity connected with the high-pressure gas reservoir rises to a first preset value, the one-way valve between the side cavity and the high-pressure gas reservoir opens, and the gas flows from the independent air pump into the high-pressure gas reservoir. When the pressure of the side cavity connected with the low-pressure gas reservoir falls to a second preset value, the one-way valve between the side cavity and the low-pressure gas reservoir opens, and the gas flows from the low-pressure gas reservoir into the independent air pump. The high-pressure gas in the high-pressure gas reservoir flows into the first air gap of the main air cylinder from the gas supply structure on the main air cylinder, and forms a high-pressure gas film, which supports the main air cylinder piston. The gas in the first air gap flows back to the low-pressure gas reservoir from the gas return structure on the main air cylinder. The air floating system can start the independent air pump to supply gas before starting the main air cylinder, so that the main air cylinder piston reaches a suspended state before the main air cylinder is started, and the wear between the main air cylinder piston and the main air cylinder cylinder during the starting process of the main air cylinder is avoided. The independent air pump adopts independent high-pressure gas reservoir and low-pressure gas reservoir, so that the independent air pump can stably and reliably operate, and the pressure of the first air gap is always stable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 is a structural schematic diagram of an air floating system in an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of an independent air pump in an embodiment of the present application;

[0021] Figure 3 is another structure schematic diagram of the air floating system in the embodiment of the present application;

[0022] Reference signs:

[0023] 1, main cylinder; 11, main cylinder cylinder barrel; 12, main cylinder piston;

[0024] 121, first centering hole; 13, main cylinder front cavity; 14, main cylinder back cavity;

[0025] 2, high-pressure gas reservoir; 3, low-pressure gas reservoir; 4, independent air pump;

[0026] 41, air pump cylinder barrel; 42, air pump piston; 421, piston air cavity;

[0027] 422, air pump air supply gas path; 43, air pump front cavity; 44, air pump back cavity;

[0028] 45, second air gap; 46, air pump one-way valve; 47, centering groove;

[0029] 471, air pump cylinder barrel centering gas path; 48, second centering hole;

[0030] 481, air pump piston centering gas path; 5, first air gap;

[0031] 6, air return groove; 61, air return flow channel; 7, air supply hole;

[0032] 71, main air supply circuit; 72, air supply branch; 81, high-pressure one-way valve;

[0033] 82, low-pressure one-way valve; 1-1, first main cylinder; 1-2, second main cylinder;

[0034] 5-1, first air gap of the first main cylinder; 5-2, first air gap of the second main cylinder;

[0035] 6-1, first air return groove; 6-2, second air return groove; 7-1, first air supply hole;

[0036] 7-2, second air supply hole. DETAILED DESCRIPTION

[0037] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0038] In the description of the embodiments of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "first", "second" are numbered for the purpose of clearly describing the components of the product, and do not represent any substantial difference. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0039] It should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0040] As shown in Figure 1 The air floating system provided by the embodiments of the application includes a main cylinder 1, a high-pressure gas reservoir 2 and a low-pressure gas reservoir 3 arranged outside the main cylinder 1, and an independent air pump 4. The main cylinder 1 includes a main cylinder cylinder 11 and a main cylinder piston 12 installed in the main cylinder cylinder 11. A first air gap 5 is left between the main cylinder piston 12 and the inner wall of the main cylinder cylinder 11. The inner wall of the main cylinder cylinder 11 is configured with two spaced return gas structures along the axial direction of the main cylinder cylinder 11. The first air gap 5 is connected to the low-pressure gas reservoir 3 through the return gas structure. The inner wall of the main cylinder cylinder 11 is configured with two spaced gas supply structures between the two return gas structures. The first air gap 5 is connected to the high-pressure gas reservoir 2 through the gas supply structure. Specifically, the gas supply structure can be a plurality of gas holes arranged along the circumferential direction of the main cylinder cylinder 11, or an annular groove, or a plurality of spaced arc grooves, or other shaped grooves, etc., as long as the first air gap 5 can be connected to the high-pressure gas reservoir 2. One end of the gas supply structure can be arranged on the inner wall surface of the main cylinder cylinder 11, and the other end of the gas supply structure can be connected to the high-pressure gas reservoir 2 through the gas flow channel inside the main cylinder cylinder 11.

[0041] The return gas structure can be an annular groove arranged along the circumferential direction of the main cylinder cylinder 11, or a plurality of gas holes, or a plurality of spaced arc grooves, or other shaped grooves, etc., as long as the first air gap 5 can be connected to the low-pressure gas reservoir 3. One end of the return gas structure can be arranged on the inner wall surface of the main cylinder cylinder 11, and the other end of the return gas structure can be connected to the low-pressure gas reservoir 3 through the gas flow channel inside the main cylinder cylinder 11.

[0042] The high-pressure gas provided by the high-pressure gas reservoir 2 enters the first gas gap 5 from the gas supply structure on the main cylinder 1 to form a high-pressure gas film, which supports the main cylinder piston 12. Then the gas in the high-pressure gas film flows back to the low-pressure gas reservoir through the gas return structure to form a gas passage, which ensures that the pressure in the high-pressure gas film is constant. Before starting the main cylinder 1, the independent gas pump 4 is started first to form a high-pressure gas film in the first gas gap 5, which supports the main cylinder piston 12 first, and then the main cylinder 1 is started, which avoids the wear between the main cylinder piston 12 and the main cylinder cylinder 11 during the starting process of the main cylinder 1. Although the main cylinder front cavity 13 and the main cylinder back cavity 14 have a certain empty volume, they cannot be used as the low-pressure gas reservoir of the independent gas pump 4. On the one hand, the pressure fluctuation of the main cylinder front cavity 13 and the main cylinder back cavity 14 is large, which cannot make the independent gas pump 4 obtain a relatively stable working condition. On the other hand, it will cause the average pressure of the main cylinder front cavity 13 and the main cylinder back cavity 14 to be unbalanced.

[0043] The independent gas pump 4 includes a gas pump cylinder 41 and a gas pump piston 42 installed in the gas pump cylinder 41. The gas pump piston 42 divides the inner cavity of the gas pump cylinder 41 into a gas pump front cavity 43 and a gas pump back cavity 44. The high-pressure gas reservoir 2 and the low-pressure gas reservoir 3 are connected to the gas pump front cavity 43 or the gas pump back cavity 44 through a one-way valve, so that gas enters the high-pressure gas reservoir 2 from the independent gas pump 4, or gas enters the independent gas pump 4 from the low-pressure gas reservoir 3. Specifically, the high-pressure gas reservoir 2 and the low-pressure gas reservoir 3 can be connected to the gas pump front cavity 43 at the same time, or connected to the gas pump back cavity 44 at the same time. This embodiment takes the high-pressure gas reservoir 2 and the low-pressure gas reservoir 3 connected to the gas pump front cavity 43 at the same time as an example for description. The high-pressure gas reservoir 2 is connected to the gas pump front cavity 43 through a high-pressure one-way valve 81, and when the pressure in the gas pump front cavity 43 rises to a first preset value, the high-pressure one-way valve 81 opens, and the gas in the gas pump front cavity 43 enters the high-pressure gas reservoir 2. The low-pressure gas reservoir 3 is connected to the gas pump front cavity 43 through a low-pressure one-way valve 82, and when the pressure in the gas pump front cavity 43 decreases to a second preset value, the low-pressure one-way valve 82 opens, and the gas in the low-pressure gas reservoir 3 enters the gas pump front cavity 43. The first preset value is greater than the second preset value, and the pressure in the high-pressure gas reservoir 2 is greater than the pressure in the low-pressure gas reservoir 3; the pressure difference between the high-pressure gas reservoir 2 and the low-pressure gas reservoir 3 can be reasonably selected according to the weight of the main cylinder piston 12 and the use requirement. The pressure in the high-pressure gas reservoir 2 can be greater than the average pressure in the main cylinder 1, and the pressure in the low-pressure gas reservoir 3 can be less than the average pressure in the main cylinder 1.

[0044] The air floatation system provided by the embodiment comprises a main cylinder, a high-pressure gas reservoir, a low-pressure gas reservoir and an independent air pump. When the air pump piston of the independent air pump moves, the pressure in the front cavity and the back cavity of the air pump changes. When the pressure of the cavity connected to the high-pressure gas reservoir rises to a first preset value, the one-way valve between the cavity and the high-pressure gas reservoir opens, and the gas flows from the independent air pump into the high-pressure gas reservoir. When the pressure of the cavity connected to the low-pressure gas reservoir falls to a second preset value, the one-way valve between the cavity and the low-pressure gas reservoir opens, and the gas flows from the low-pressure gas reservoir into the independent air pump. The high-pressure gas in the high-pressure gas reservoir flows into the first air gap of the main cylinder from the gas supply structure on the main cylinder, and forms a high-pressure gas film, which supports the main cylinder piston. The gas in the first air gap flows back to the low-pressure gas reservoir from the gas return structure on the main cylinder. The air floatation system can start the independent air pump to supply gas before starting the main cylinder, so that the main cylinder piston reaches a suspended state before the main cylinder is started, thereby avoiding the wear between the main cylinder piston and the main cylinder cylinder during the starting process of the main cylinder. The independent air pump adopts independent high-pressure and low-pressure gas reservoirs, which can ensure stable and reliable operation of the independent air pump and keep the pressure of the first air gap stable.

[0045] Further, as shown in Figure 1 The gas return structure is a ring-shaped gas return groove 6 arranged along the circumference of the main cylinder cylinder 11. The gas return groove 6 is connected to the low-pressure gas reservoir 3 through a gas return flow channel 61 arranged in the main cylinder cylinder 11. The distance between the two gas return grooves 6 needs to be less than the length of the main cylinder piston 12, and the gas return groove 6 does not exceed the end face of the main cylinder piston 12 at all times during the reciprocating movement of the main cylinder piston 12, i.e., the gas return groove 6 is not in communication with the main cylinder front cavity 13 and the main cylinder back cavity 14 at all times. For the convenience of processing, the inlet of the gas return flow channel 61 can be arranged at the end of the main cylinder cylinder 11, and the gas return flow channel 61 can be arranged along the length direction of the main cylinder cylinder 11.

[0046] Further, as shown in Figure 1 The gas inlet structure is a plurality of gas supply holes 7 arranged along the circumference of the main cylinder cylinder 11 at intervals. The number of the gas supply holes 7 can be four or more, and the gas supply holes 7 have a certain throttling effect.

[0047] Further, the main cylinder cylinder 11 is provided with a ring-shaped gas supply main circuit 71, the gas supply main circuit 71 is connected to the high-pressure gas reservoir 2, and the plurality of gas supply holes 7 are connected to the gas supply main circuit 71 through one-to-one corresponding gas supply branch circuits 72. For the convenience of processing, the inlet of the gas supply main circuit 71 can be arranged at the end of the main cylinder cylinder 11, and the gas supply branch circuit 72 can be arranged along the length direction of the main cylinder cylinder 11.

[0048] Further, as shown in Figure 1As shown, two end faces of the main cylinder piston 12 are respectively provided with a first centering hole 121, the first centering hole 121 is communicated with the first air gap 5 and corresponds to the return air groove 6. Specifically, the number of the first centering hole 121 can be one pair or multiple pairs. When the main cylinder piston 12 moves to the balance position, the first centering hole 121 on the side of the main cylinder piston 12 facing the main cylinder front cavity 13 corresponds to the left return air groove 6, and the first centering hole 121 on the side of the main cylinder piston 12 facing the main cylinder back cavity 14 corresponds to the right return air groove 6. Thus, the main cylinder front cavity 13 and the main cylinder back cavity 14 are communicated with each other through the return air groove 6 and the return air flow channel 61, so as to keep the pressure balance of the main cylinder front cavity 13 and the main cylinder back cavity 14 and prevent the main cylinder piston 12 from drifting due to other reasons.

[0049] Further, as shown, Figure 2 The gas pump piston 42 and the inner wall of the gas pump cylinder 41 are left with a second air gap 45, the gas pump piston 42 is provided with a piston air cavity 421 communicated with the second air gap 45, and the gas pump front cavity 43 is communicated with the piston air cavity 421 through a gas pump one-way valve 46, so that the gas flows from the gas pump front cavity 43 into the piston air cavity 421. Specifically, the piston air cavity 421 is communicated with the second air gap 45 through a gas pump gas supply channel 422. For the alternately moving gas floating piston, the scavenging amount of the main cylinder piston 12 is usually 1-2 orders of magnitude larger than the gas consumption amount of the gas pump piston 42, so the power consumption and size of the independent gas pump 4 are much smaller than those of the main cylinder 1, and thus the gas floating design of the independent gas pump 4 can adopt the traditional gas channel design.

[0050] When the independent gas pump 4 operates, the gas pump piston 42 starts to reciprocate, and the gas pump front cavity 43 and the gas pump back cavity 44 will have pressure fluctuations. When the pressure of the gas pump front cavity 43 is greater than a third preset value, the gas pump one-way valve 46 is opened, and the gas flows from the gas pump front cavity 43 into the piston air cavity 421; when the pressure of the gas pump front cavity 43 is less than the third preset value, the gas pump one-way valve 46 is closed. The gas flow in the piston air cavity 421 is injected into the second air gap 45 through the gas pump gas supply channel 422, and a high-pressure gas film is formed in the second air gap 45 to support the gas pump piston 42, preventing mechanical wear between the gas pump piston 42 and the gas pump cylinder 41.

[0051] Further, as shown, Figure 2As shown, the inner wall of the air pump cylinder 41 is provided with an annular centering groove 47 in the circumferential direction, which corresponds to the balance position of the air pump piston 42. The second air gap 45 is communicated with the air pump front cavity 43 through the centering groove 47 and the air pump cylinder centering air path 471, and the end of the air pump piston 42 facing the air pump back cavity 44 is provided with a second centering hole 48 communicated with the second air gap 45 through the air pump piston centering air path 481 and corresponding to the centering groove 47. Alternatively, the second air gap 45 is communicated with the air pump back cavity 44 through the centering groove 47, and the end of the air pump piston 42 facing the air pump front cavity 43 is provided with a third centering hole communicated with the second air gap 45 and corresponding to the centering groove 47. Both of the above-mentioned two ways utilize the centering groove 47 to communicate the air pump front cavity 43 and the air pump back cavity 44, so as to keep the air pump front cavity 43 and the air pump back cavity 44 in pressure balance, preventing the air pump piston 42 from drifting due to other reasons.

[0052] Further, as shown in the figure, Figure 3 The number of main air cylinders 1 can be multiple, and the first air gap 5 of each main air cylinder 1 is respectively communicated with the low-pressure air reservoir 3 through the respective air return structure, and the first air gap 5 of each main air cylinder 1 is respectively communicated with the high-pressure air reservoir 2 through the respective air supply structure. In this embodiment, two main air cylinders 1 are taken as an example for description, which are respectively the first main air cylinder 1-1 and the second main air cylinder 1-2, and the two main air cylinders can be independent of each other. The first air gap 5-1 of the first main air cylinder is communicated with the low-pressure air reservoir 3 through the first air return groove 6-1, and the first air gap 5-1 of the first main air cylinder is communicated with the high-pressure air reservoir 2 through the first air supply hole 7-1. The first air gap 5-2 of the second main air cylinder is communicated with the low-pressure air reservoir 3 through the second air return groove 6-2, and the first air gap 5-2 of the second main air cylinder is communicated with the high-pressure air reservoir 2 through the second air supply hole 7-2.

[0053] It can be seen from the above embodiments that the air floatation system provided by the application comprises a main cylinder, a high-pressure gas reservoir, a low-pressure gas reservoir and an independent air pump. When the air pump piston of the independent air pump moves, the pressure in the front cavity and the back cavity of the air pump changes. When the pressure of the side cavity connected with the high-pressure gas reservoir rises to a first preset value, the one-way valve between the side cavity and the high-pressure gas reservoir opens, and the gas enters the high-pressure gas reservoir from the independent air pump. When the pressure of the side cavity connected with the low-pressure gas reservoir decreases to a second preset value, the one-way valve between the side cavity and the low-pressure gas reservoir opens, and the gas enters the independent air pump from the low-pressure gas reservoir. The high-pressure gas in the high-pressure gas reservoir flows into the first air gap of the main cylinder from the gas supply structure on the main cylinder, and forms a high-pressure gas film, which supports the main cylinder piston. The gas in the first air gap flows back to the low-pressure gas reservoir from the gas return structure on the main cylinder. The air floatation system can start the independent air pump to supply gas before starting the main cylinder, so that the main cylinder piston reaches a suspension state before the main cylinder is started, thereby avoiding the wear between the main cylinder piston and the main cylinder cylinder during the starting process of the main cylinder. The independent air pump adopts independent high-pressure gas reservoir and low-pressure gas reservoir, which can make the independent air pump run stably and reliably, and ensure that the pressure of the first air gap is always stable.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit it; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An air flotation system, characterized in that: The invention comprises a master cylinder and a high-pressure air reservoir, a low-pressure air reservoir and an independent air pump arranged outside the master cylinder, the master cylinder comprising a master cylinder barrel and a master cylinder piston installed in the master cylinder barrel, a first air gap being left between the master cylinder piston and the inner wall of the master cylinder barrel; the inner wall of the master cylinder barrel is constructed with two spaced-apart air return structures along the axial direction of the master cylinder barrel, the first air gap is connected to the low-pressure air reservoir through the air return structures; the inner wall of the master cylinder barrel is constructed with two spaced-apart air supply structures between the two air return structures, the first air gap is connected to the high-pressure air reservoir through the air supply structures; The independent air pump includes an air pump cylinder and an air pump piston installed in the air pump cylinder, the air pump piston divides the inner cavity of the air pump cylinder into an air pump front cavity and an air pump back cavity, the high-pressure air reservoir is connected to the air pump front cavity or the air pump back cavity through a high-pressure one-way valve, and the low-pressure air reservoir is connected to the air pump front cavity or the air pump back cavity through a low-pressure one-way valve, so that gas enters the high-pressure air reservoir from the independent air pump, or gas enters the independent air pump from the low-pressure air reservoir; When the pressure in the front chamber of the air pump rises to a first preset value, the high-pressure one-way valve opens, and the gas in the front chamber of the air pump enters the high-pressure gas reservoir; when the pressure in the front chamber of the air pump drops to a second preset value, the low-pressure one-way valve opens, and the gas in the low-pressure gas reservoir enters the front chamber of the air pump; the first preset value is greater than the second preset value, and the pressure in the high-pressure gas reservoir is greater than the pressure in the low-pressure gas reservoir; A second air gap is left between the air pump piston and the inner wall of the air pump cylinder, and a piston air cavity connected to the second air gap is provided in the air pump piston. The air pump front cavity is connected to the piston air cavity through an air pump one-way valve, so that gas enters the piston air cavity from the air pump front cavity; The inner wall of the air pump cylinder is provided with an annular centering groove in the circumferential direction, and the centering groove corresponds to the equilibrium position of the air pump piston; The second air gap is connected to the air pump front cavity through the centering groove, and a second centering hole is formed at one end of the air pump piston facing the air pump back cavity, and the second centering hole is connected to the second air gap and corresponds to the centering groove; or The second air gap is connected to the air pump back cavity through the centering groove. A third centering hole is opened at one end of the air pump piston facing the air pump front cavity. The third centering hole is connected to the second air gap and corresponds to the centering groove.

2. The air flotation system according to claim 1, characterized in that: The air return structure is an annular air return groove arranged along the circumference of the main cylinder barrel.

3. The air flotation system according to claim 2, characterized in that: The return air groove is connected to the low-pressure air reservoir through a return air flow channel arranged in the cylinder barrel of the master cylinder.

4. The air flotation system according to claim 2, characterized in that: The air supply structure is a plurality of air supply holes arranged at intervals along the circumference of the cylinder barrel of the master cylinder.

5. The air flotation system according to claim 4, characterized in that: An annular main air supply circuit is provided in the cylinder barrel of the master cylinder, and the main air supply circuit is connected to the high-pressure air reservoir. The plurality of air supply holes are connected to the main air supply circuit through air supply branches provided in one-to-one correspondence.

6. The air flotation system according to claim 2, characterized in that: A first centering hole is respectively formed on both end surfaces of the master cylinder piston. The first centering hole is connected to the first air gap and corresponds to the air return groove.

7. The air flotation system according to claim 1, characterized in that: There are multiple master cylinders, and the first air gap of each master cylinder is connected to the low-pressure air reservoir through its own return air structure, and the first air gap of each master cylinder is connected to the high-pressure air reservoir through its own air supply structure.

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