阅读说明：本技术 组合式油封结构及空压机 (Combined oil seal structure and air compressor ) 是由 喻久哲 黄潜 孙北 安思宇 李春江 翟双 于 2020-07-31 设计创作，主要内容包括：本发明提供一种组合式油封结构及空压机,组合式油封结构包括设置在旋转轴上的主油封,旋转轴穿设在壳体的壳体通孔中,壳体通孔与位于壳体内部的油腔相通,组合式油封结构还包括套设于旋转轴外的挡油环和设置在旋转轴上的环形甩油凸起,环形甩油凸起、挡油环、及主油封沿旋转轴的轴向且沿背离油腔方向依次分布。当油腔中的润滑油等沿旋转轴向壳体外部渗漏时,环形甩油凸起会阻挡住润滑油,且环形甩油凸起会将润滑油甩向壳体的壁上,使得润滑油再回流至油腔中；而部分润滑油在进入挡油环处时,也会被挡油环阻挡住,这样在环形甩油凸起及挡油环的作用下,能大量减少进入主油封处的润滑油,从而保证本组合式油封结构的密封性能更好。(The invention provides a combined oil seal structure and an air compressor, wherein the combined oil seal structure comprises a main oil seal arranged on a rotating shaft, the rotating shaft is arranged in a shell through hole of a shell in a penetrating manner, the shell through hole is communicated with an oil cavity positioned in the shell, the combined oil seal structure also comprises an oil retainer sleeved outside the rotating shaft and an annular oil throwing bulge arranged on the rotating shaft, and the annular oil throwing bulge, the oil retainer and the main oil seal are sequentially distributed along the axial direction of the rotating shaft and the direction deviating from the oil cavity. When lubricating oil and the like in the oil cavity leak to the outside of the shell along the rotating shaft, the annular oil throwing bulge blocks the lubricating oil and throws the lubricating oil to the wall of the shell, so that the lubricating oil flows back to the oil cavity again; and when part of lubricating oil enters the oil retainer, the lubricating oil can be also blocked by the oil retainer, so that the lubricating oil entering the main oil seal can be greatly reduced under the action of the annular oil throwing bulge and the oil retainer, and the sealing performance of the combined oil seal structure is better.)

1. The utility model provides a modular oil seal structure, is including setting up main oil blanket (2) on rotation axis (1), wear to establish in casing through-hole (31) of casing (3) in rotation axis (1), casing through-hole (31) communicate with each other with oil pocket (32) that are located casing (3) inside, a serial communication port, modular oil seal structure is still including the cover locate rotation axis (1) outer oil slinger (4) and set up annular on rotation axis (1) and get rid of oily arch (11), annular is got rid of oily arch (11), oil slinger (4) and main oil blanket (2) and just distributes in proper order along deviating from oil pocket (32) direction along the axial of rotation axis (1).

2. The combined oil seal structure according to claim 1, wherein an oil return hole (33) is formed in the housing (3), one end of the oil return hole (33) is communicated with a cavity between the oil retainer (4) and the main oil seal (2), and the other end of the oil return hole (33) is communicated with the oil cavity (32).

3. The combined oil seal structure according to claim 1, wherein the oil slinger (4) is provided with an oil ring through hole (41), and the cavity between the oil slinger (4) and the main oil seal (2) is communicated with the oil chamber (32) through the oil ring through hole (41).

4. The combined oil seal structure according to claim 3, wherein the oil slinger (4) is provided with a plurality of oil ring through holes (41) which are circumferentially spaced apart, and the lowest oil ring through hole (41) is located between the surface of the lubricating oil in the oil chamber (32) and the rotating shaft (1).

5. The combined oil seal structure of claim 1, wherein the annular oil slinging bulge (11) is in a knife edge structure.

6. The combined oil seal structure according to claim 1, wherein a first gap is provided between the inner side wall of the slinger (4) and the rotating shaft (1), a second gap is provided between the slinger (4) and the annular oil slinger (11), the first gap is communicated with a cavity between the slinger (4) and the main oil seal (2), and the first gap is communicated with the oil chamber (32) through the second gap.

7. The combined oil seal structure according to claim 6, wherein a groove (12) is formed on the rotating shaft (1) in the axial direction corresponding to the oil slinger (4), a side wall of the annular oil slinger protrusion (11) forms a side wall of the groove (12), and the first gap is formed between the bottom of the groove (12) and the inner side wall of the oil slinger (4).

8. The combined oil seal structure according to claim 1, wherein the oil slinger (4) is fixed to the housing (3) by a bolt (42).

9. The combined oil seal structure according to claim 1, wherein the main oil seal (2) comprises a steel skeleton and a seal lip, and an oil return line is arranged on the inner side wall of the seal lip.

10. The utility model provides an air compressor machine, includes air compressor machine host computer (100) and gear box (300), air compressor machine host computer (100) includes two rotation axis (1), and two rotation axis (1) are drive shaft and driven shaft respectively, install the driving gear in the drive shaft, install the driven gear with driving gear engaged with on the driven shaft, gear box (300) are including casing (3) and oil pocket (32), driving gear and driven gear all are located oil pocket (32), its characterized in that, the air compressor machine still includes according to claim 1 combination formula oil seal structure.

Technical Field

The invention relates to an oil seal structure, in particular to a combined oil seal structure and an air compressor.

Background

The air compressor is an important part in a hydrogen fuel cell system, provides clean and oil-free compressed air for the fuel cell system, and directly outputs electric energy through chemical reaction between hydrogen and oxygen in the air. Because the electric pile of the hydrogen fuel cell system has higher requirements on the quality of compressed air, the air output by the air compressor is required not to contain lubricating oil.

The positive displacement air compressors such as roots's formula or screw utilize two rotors motion each other to carry the air, so this type of air compressor has a pair of synchronous gear, and this just requires lubricating oil to lubricate the gear, generally for preventing lubricating oil from revealing, can install the oil blanket on two rotation axes of air compressor and seal. If the oil blanket appears damaging, then can lead to lubricating oil to reveal, in case inside lubricating oil got into air compressor machine compression cavity, then can lead to containing lubricating oil in the compressed air, and then can cause fuel cell system's galvanic pile to damage. Meanwhile, after a large amount of lubricating oil is leaked, the lubricating effect of the gear is poor, and the gear is blocked or the rotor of the air compressor is blocked.

At present, the oil seal structure of a common air compressor is single, only one or two framework oil seals are used for sealing, the sealing performance of the oil seal structure is poor, the problem of leakage of lubricating oil can often occur, and the damage of a pile or the damage of the air compressor of a fuel cell system is caused.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a combined oil seal structure with better sealing effect.

In order to achieve the purpose, the invention provides a combined oil seal structure, which comprises a main oil seal arranged on a rotating shaft, wherein the rotating shaft is arranged in a shell through hole of a shell in a penetrating manner, the shell through hole is communicated with an oil cavity positioned in the shell, the combined oil seal structure further comprises an oil retainer sleeved outside the rotating shaft and an annular oil throwing bulge arranged on the rotating shaft, and the annular oil throwing bulge, the oil retainer and the main oil seal are sequentially distributed along the axial direction of the rotating shaft and along the direction deviating from the oil cavity.

Furthermore, an oil return hole is formed in the shell, one end of the oil return hole is communicated with a cavity between the oil retainer and the main oil seal, and the other end of the oil return hole is communicated with the oil cavity.

Furthermore, an oil ring through hole is formed in the oil slinger, and a cavity between the oil slinger and the main oil seal is communicated with the oil cavity through the oil ring through hole.

Furthermore, a plurality of oil ring through holes distributed at intervals along the circumferential direction are formed in the oil slinger, and the oil ring through hole located at the lowest position is located between the liquid level of lubricating oil in the oil cavity and the rotating shaft.

Furthermore, the annular oil throwing bulge is of a knife edge structure.

Furthermore, a first gap is formed between the inner side wall of the oil slinger and the rotating shaft, a second gap is formed between the oil slinger and the annular oil throwing bulge, the first gap is communicated with a cavity between the oil slinger and the main oil seal, and the first gap is communicated with the oil cavity through the second gap.

Furthermore, a groove is formed in the position, corresponding to the oil slinger, of the rotating shaft in the axial direction, one side wall of the annular oil slinger forms one side wall of the groove, and the first gap is formed between the bottom of the groove and the inner side wall of the oil slinger.

Further, the slinger is fixed to the housing by bolts.

Furthermore, the main oil seal comprises a steel skeleton and a seal lip, and an oil return line is arranged on the inner side wall of the seal lip.

As described above, the combined oil seal structure according to the present invention has the following beneficial effects:

when lubricating oil and the like in the oil cavity leaks to the outside of the shell along the rotating shaft, the annular oil throwing bulge arranged on the rotating shaft can block the lubricating oil, and the annular oil throwing bulge can rotate along with the rotating shaft and throw the lubricating oil to the wall of the shell, so that the lubricating oil flows back into the oil cavity; and part of the lubricating oil which is not blocked by the annular oil throwing bulge can be blocked by the oil retainer when entering the oil retainer, so that the lubricating oil entering the main oil seal can be greatly reduced under the action of the annular oil throwing bulge and the oil retainer, and then a small amount of lubricating oil entering the main oil seal can be effectively prevented from leaking outwards under the sealing action of the main oil seal, so that the aim of effectively preventing the lubricating oil from leaking from the shell is finally fulfilled, and the sealing performance of the combined oil seal structure is better.

The invention aims to solve another technical problem of providing an air compressor with longer service life.

In order to achieve the purpose, the invention provides an air compressor, which comprises an air compressor main machine and a gear box, wherein the air compressor main machine comprises two rotating shafts, the two rotating shafts are respectively a driving shaft and a driven shaft, a driving gear is installed on the driving shaft, a driven gear meshed with the driving gear is installed on the driven shaft, the gear box comprises a shell and an oil cavity, the driving gear and the driven gear are both located in the oil cavity, and the air compressor further comprises the combined oil seal structure.

As described above, the air compressor of the present invention has the following advantages:

the air compressor can prevent lubricating oil in the gear box from entering the air compressor main machine along the two rotating shafts and prevent the gears and the rotating shafts from being blocked or even damaged due to leakage of a large amount of lubricating oil based on the combined oil seal structure of the air compressor, so that the air compressor can stably run for a long time, the service life is longer, and the compressed air generated by the air compressor main machine is prevented from containing the lubricating oil.

Drawings

Fig. 1 is a schematic diagram of a combined oil seal structure according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of an air compressor in the embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a gear box according to an embodiment of the present invention.

Description of the element reference numerals

Oil return hole of main machine 33 of 100 air compressor

1 rotating shaft 34 gearbox water channel

11 oil arch 35 bleeder vent is got rid of to annular

12 groove 36 oil level mirror mounting hole

2 main oil seal 37 skid-mounted hole

300 Gear case 38 bolt hole

3 casing 4 oil deflector ring

31 casing through hole 41 oil ring through hole

32 oil cavity 42 bolt

321 first inner sub-cavity 500 power device

322 second inner sub-cavity 51 output shaft

323 upper transition arc surface 6 coupling

324 lower transition arc surface 7 inlet joint

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention unless otherwise specified.

As shown in fig. 1, the present invention provides a combined oil seal structure, which includes a main oil seal 2 disposed on a rotating shaft 1, wherein the rotating shaft 1 is disposed through a casing through hole 31 of a casing 3, the casing through hole 31 is communicated with an oil cavity 32 disposed inside the casing 3, the combined oil seal structure further includes an oil slinger 4 sleeved outside the rotating shaft 1 and an annular oil slinger protrusion 11 disposed on the rotating shaft 1, and the annular oil slinger protrusion 11, the oil slinger 4, and the main oil seal 2 are sequentially distributed along an axial direction of the rotating shaft 1 and along a direction departing from the oil cavity 32. The combined oil seal structure comprises an annular oil throwing bulge 11, an oil scraper ring 4 and a main oil seal 2 which are sequentially distributed along the axial direction of a rotating shaft 1 and along the direction deviating from an oil cavity 32, namely the annular oil throwing bulge 11, the oil scraper ring 4 and the main oil seal 2 are sequentially distributed along the direction facing the outside of a shell 3, when lubricating oil in the oil cavity 32 leaks to the outside of the shell 3 along the rotating shaft 1, the annular oil throwing bulge 11 arranged on the rotating shaft 1 can block the lubricating oil, and the annular oil throwing bulge 11 can rotate along with the rotating shaft 1 and throw the lubricating oil to the wall of the shell 3, so that the lubricating oil flows back to the oil cavity 32 again; and part of the lubricating oil which is not blocked by the annular oil throwing bulge 11 can be blocked by the oil slinger 4 when entering the oil slinger 4, so that the lubricating oil entering the main oil seal 2 can be greatly reduced under the action of the annular oil throwing bulge 11 and the oil slinger 4, and then under the sealing action of the main oil seal 2, a small amount of lubricating oil entering the main oil seal can be effectively prevented from leaking outwards, the aim of effectively preventing the lubricating oil from leaking from the shell 3 is finally realized, and the sealing performance of the combined oil seal structure is better.

Meanwhile, as shown in fig. 2, the invention further provides an air compressor, which comprises an air compressor main body 100 and a gear box 300, wherein the air compressor main body 100 comprises two rotating shafts 1, the two rotating shafts 1 are respectively a driving shaft and a driven shaft, a driving gear is mounted on the driving shaft, a driven gear meshed with the driving gear is mounted on the driven shaft, the gear box 300 comprises a shell 3 and an oil cavity 32, the driving gear and the driven gear are both located in the oil cavity 32, and the air compressor further comprises the combined oil seal structure. The air compressor can prevent lubricating oil in the gear box 300 from entering the air compressor main body 100 along the two rotating shafts 1 and prevent the gears and the rotating shafts 1 from being blocked or even damaged due to leakage of a large amount of lubricating oil based on the combined oil seal structure of the air compressor, so that the air compressor can stably run for a long time, has longer service life, and avoids lubricating oil in compressed air generated by the air compressor main body 100.

As shown in fig. 1, in the present embodiment, an oil return hole 33 is formed in the housing 3, one end of the oil return hole 33 is communicated with the cavity between the slinger 4 and the main oil seal 2, and the other end of the oil return hole 33 is communicated with the oil chamber 32; the lubricating oil entering the cavity between the oil slinger 4 and the main oil seal 2 flows back to the oil cavity 32 through the oil return hole 33, so that the lubricating oil entering the main oil seal 2 is further reduced by utilizing the oil return hole 33, and the sealing effect of the combined oil seal structure is enhanced.

As shown in fig. 1, in the present embodiment, the oil control ring 4 is provided with an oil control ring through hole 41, and a cavity between the oil control ring 4 and the main oil seal 2 is communicated with the oil chamber 32 through the oil control ring through hole 41, so that when excessive lubricating oil enters the cavity, the lubricating oil is beneficial to flowing back to the oil chamber 32 through the oil control ring through hole 41, thereby reducing the leakage of the lubricating oil. Meanwhile, in the present embodiment, the oil control ring 4 is provided with a plurality of oil control ring through holes 41 distributed at intervals along the circumferential direction, and the oil control ring through hole 41 located at the lowest position is located between the liquid level of the lubricating oil in the oil chamber 32 and the rotating shaft 1, so that the lubricating oil can flow back more efficiently.

As shown in fig. 1, in the present embodiment, the annular oil throwing protrusion 11 is in a knife edge structure, that is, slopes are disposed on two side walls of the annular oil throwing protrusion 11, and this structural design can enhance the oil throwing effect, thereby accelerating the lubricating oil to flow back into the oil cavity 32. In addition, the inner diameter of the slinger 4 is larger than the outer diameter of the annular oil slinger protrusion 11.

As shown in fig. 1, in the present embodiment, a first gap is provided between the inner side wall of the slinger 4 and the rotating shaft 1, a second gap is provided between the slinger 4 and the annular oil slinger 11, the first gap is communicated with a cavity between the slinger 4 and the main oil seal 2, and the first gap is communicated with the oil chamber 32 through the second gap. Like this, the lubricating oil that gets into in the cavity will flow to the annular through first clearance, second clearance and get rid of oily protruding 11 departments, and then get rid of lubricating oil to casing 3 and oil pocket 32 through the annular oil of getting rid of protruding ability of getting rid of, promotes the speed of the lubricating oil backward flow in to oil pocket 32 in the cavity, guarantees that this combination formula oil seals the sealed effect of structure better. In this embodiment, a groove 12 is formed at a position of the rotating shaft 1 corresponding to the oil slinger 4 along the axial direction, a side wall of the annular oil throwing protrusion 11 forms a side wall of the groove 12, the first gap is formed between the bottom of the groove 12 and the inner side wall of the oil slinger 4, the groove 12 can guide and promote the lubricating oil in the cavity to flow back into the groove 12, and a side wall of the annular oil throwing protrusion 11 forms a side wall of the groove 12, so that the contact area between the annular oil throwing protrusion 11 and the lubricating oil in the groove 12 can be increased, the lubricating oil in the groove 12 can be efficiently thrown towards the housing 3 and the oil cavity 32, the leakage of the lubricating oil is further prevented, the sealing effect is enhanced, and the annular oil throwing protrusion 11 can generate a suction force on the lubricating oil in the cavity through the groove 12 in the oil throwing process, and promote the lubricating oil in the cavity to flow into the.

As shown in fig. 1, in the present embodiment, the oil slinger 4 is fixed on the housing 3 by the bolt 42, which not only facilitates the installation of the oil slinger 4, but also realizes the detachable connection between the oil slinger 4 and the housing 3, and facilitates the detachment of the oil slinger 4 when necessary.

In the embodiment, the annular oil slinger protrusion 11, the oil slinger 4 and the main oil seal 2 are all located in the through hole 31 of the housing, and the through hole 31 of the housing is of a stepped structure. The distances from the annular oil slinging bulge 11, the oil retainer 4 and the main oil seal 2 to the oil cavity 32 are gradually increased, namely, the annular oil slinging bulge 11 is closest to the oil cavity 32, and the main oil seal 2 is farthest from the oil cavity 32.

Main oil blanket 2 includes steel skeleton and seal lip in this embodiment, is equipped with back oil line on the inside wall of seal lip, and seal lip and rotation axis 1 in close contact with. The main oil seal 2 in this embodiment is a framework oil seal. The seal lip in this embodiment also includes a primary lip on the oil side and a secondary lip on the air side. In this embodiment, the sealing lip is made of teflon. In other embodiments, the material of the sealing lip may be fluororubber, and the main oil seal 2 further includes a spring. In addition, the oil return line in this embodiment may be one of a one-way oil return line, a splayed oil return line, a sine wave oil return line, or a fold line oil return line.

The air compressor of the present embodiment is mainly used for a hydrogen fuel cell. The annular oil throwing bulge 11 is formed by machining the cylindrical surface of the rotating shaft 1. This combination formula oil seal structure sets up the sealed position of lubricating oil in the casing 3. In the embodiment, the annular oil throwing bulge 11 is of a first oil-proof structure; the first gap is arranged between the oil slinger 4 and the rotating shaft 1, and the first gap is of a second oil-proof structure; the oil slinger 4 is provided with an oil ring through hole 41, and the lowest point oil ring through hole 41 is positioned in the middle position of the lubricating oil level and the lower measuring point of the rotating shaft 1, and the position is a third oil-proof structure. An oil return hole 33 which is a fourth oil-proof structure is arranged on the shell 3 under the rotating shaft 1; the main oil seal 2 is of a fifth oil-proof structure. This combination formula oil seal structure can reduce lubricating oil in a large number and enter main oil blanket 2 departments through oil slinger 4 and annular oil slinger arch 11, and a small amount of lubricating oil gets into the back, can return gear box 300 through oil return hole 33, further reduces the lubricated oil mass of main oil blanket 2 departments, in case lubricating oil is stored in main oil blanket 2 departments in a large number, the oil ring through-hole 41 of accessible oil slinger 4 discharges to guarantee that this combination formula oil seal structure can effectively prevent in the gear box 300 of air compressor machine lubricating oil and reveal.

In addition, as shown in fig. 2, the air compressor of this embodiment further includes a power device 500, one end of the air compressor main unit 100 is fixedly connected to one end of the gear box 300, the other end of the gear box 300 is fixedly connected to the power device 500, and the output shaft 51 of the power device 500 is connected to the driving shaft of the air compressor main unit 100 through the coupling 6. The air compressor is an integrated air compressor, one end of an air compressor main machine 100 is fixedly connected with one end of a gear box 300, and the other end of the gear box 300 is fixedly connected with a power device 500, so that the air compressor main machine 100, the gear box 300 and the power device 500 are integrated into an integrated design, the integral structure of the air compressor is compact, and the size of the air compressor is small; and the output shaft 51 of the power device 500 is connected with the driving shaft of the air compressor main unit 100 through the coupler 6, the power device 500 can directly drive the driving shaft of the air compressor main unit 100 to operate through the coupler 6, the response speed of the air compressor main unit 100 is improved, the transmission efficiency is improved, the energy loss in the transmission process is reduced, the overall efficiency of the air compressor is further improved, the operational reliability of the air compressor is improved, the service life of the air compressor is prolonged, and the connecting mode of the coupler 6 is adopted, so that the overall structure of the air compressor is more compact, and the overall volume of the air compressor is further reduced.

As shown in fig. 2, the integrated air compressor of the present embodiment further includes an inlet joint 7, and the inlet joint 7 is installed at an air inlet end of the air compressor main body 100. This embodiment makes the structure of the air compressor more compact by directly installing the inlet joint 7 at the air inlet end of the air compressor main unit 100.

As shown in fig. 3, the oil chamber 32 of the gear housing 300 in this embodiment includes a first inner sub-chamber 321 and a second inner sub-chamber 322 communicating with the first inner sub-chamber 321, the driving gear is located in the first inner sub-chamber 321, and the driven gear is located in the second inner sub-chamber 322. When the power device 500 drives the driving shaft to rotate, the driving shaft drives the driven shaft to rotate together through the driving gear and the driven gear, and then compressed air is formed. In this embodiment, the cross-sectional profiles of the first inner sub-chamber 321 and the second inner sub-chamber 322 are both arc-shaped, an upper transition arc surface 323 is arranged on the upper side wall of the communication position of the first inner sub-chamber 321 and the second inner sub-chamber 322, a lower transition arc surface 324 is arranged on the lower side wall of the communication position of the first inner sub-chamber 321 and the second inner sub-chamber 322, and the central axis of the upper transition arc surface 323 and the central axis of the lower transition arc surface 324 are both located outside the oil chamber 32. The oil chamber 32 in this embodiment is in the shape of an inverted 8.

As shown in fig. 3, in the present embodiment, a gearbox water channel 34 is provided inside the gearbox 300 to cool the lubricating oil in the oil chamber 32 of the gearbox 300 by using the gearbox water channel 34, a power water channel is provided inside the power plant 500, and the gearbox water channel 34 is communicated with the power water channel, so that the cooling water in the gearbox 300 can flow with the cooling water in the power plant 500, and the arrangement of the water channels reduces the number of components such as connecting water pipes and water pipe joints, simplifies the overall structure, and reduces the flow resistance of the water channel.

Meanwhile, as shown in fig. 3, in the present embodiment, the gear box water channel 34 of the gear box 300 surrounds the periphery of the oil cavity 32 of the gear box 300, and the cross-sectional shape of the gear box water channel 34 is the same as the outline shape of the oil cavity 32 of the gear box 300, that is, the extending shape of the gear box water channel 34 is designed according to the outline shape of the oil cavity 32, so as to increase the cooling area, further enhance the cooling effect of the gear box water channel 34 on the lubricating oil in the oil cavity 32, maintain the overall temperature stability of the gear box 300, and reduce the thermal. The gearbox water channel 34 in this embodiment is inverted 8-shaped and is adjacent to the oil cavity 32 of the gearbox 300. The gearbox water channel 34 is an annular coherent cooling water channel.

In this embodiment, a breather valve is installed at the upper portion of the gear case 300 to balance the internal and external pressures of the gear case 300 by the breather valve, thereby reducing leakage of the lubricating oil. Meanwhile, as shown in fig. 3, in the present embodiment, air holes 35 are formed at both the upper and lower portions of the gear case 300, the air holes 35 communicate with the oil chamber 32 of the gear case 300, an air vent valve is installed in the air holes 35 at the upper portion of the gear case 300, and a blocking member is installed in the air holes 35 at the lower portion of the gear case 300. The upper part and the lower part of the gear box 300 are both provided with the air holes 35, so that the air compressor can be used in a forward and reverse mode, and the use flexibility is improved. The ventilation valve is installed in the ventilation hole 35 through threads so as to be convenient to install and detach.

An oil level mirror is mounted on a side wall of the gear case 300 in this embodiment to facilitate observation of the oil level of the lubricating oil in the oil chamber 32 through the oil level mirror. As shown in fig. 3, the oil level mirror is mounted in the oil level mirror mounting hole 36 on the side wall of the gear case 300.

The above-described combined oil seal structure is also provided on the output shaft 51 of the power unit 500 in the present embodiment to prevent the lubrication in the oil chamber 32 from leaking from the connection with the power unit 500.

As shown in fig. 3, in the present embodiment, a prying hole 37 is formed in the gear housing 300, the prying hole 37 is a threaded hole, and a solid plane is formed at a position of the power device 500 corresponding to the prying hole 37. In the dismantlement process, twist sled dress bolt in sled dress hole 37 to make sled dress bolt pass sled dress hole 37, push up on power device 500's solid plane, utilize the threaded connection effect of sled dress bolt and sled dress hole 37, make sled dress bolt can exert great effort to power device 500 gradually, thereby push up power device 500 and gear box 300, make things convenient for the dismantlement work between the two. In this embodiment, 2 skid holes 37 are formed in the gear housing 300 and are respectively disposed at the upper and lower portions of the connection end of the gear housing 300 and the power unit 500.

In this embodiment, the power device 500 is a motor, specifically a permanent magnet synchronous motor. The motor comprises a motor stator, a motor rotor, a motor shell, a motor rear end cover, a high-pressure connector and a low-pressure connector.

The air compressor main body 100 of the present embodiment is of a twisted-lobe roots type. The coupling 6 is a flexible coupling.

The driving end of the air compressor main body 100 of this embodiment is fixedly connected with one end of the gear box 300 through a bolt 42, and the other end of the gear box 300 is connected with the front end of the motor through a bolt 42. Coupling 6 specifically adopts pin formula coupling in this embodiment, conveniently realizes being connected between the output shaft 51 of motor and the drive shaft of air compressor machine host computer 100, and the output shaft 51 of motor passes through splined connection with coupling 6. As shown in fig. 3, a plurality of bolt holes 38 are formed in the gear box 300, and the bolts 42 pass through the bolt holes 38 in the gear box 300 to connect with the air compressor main unit 100, so that the connection between the gear box 300 and the air compressor main unit 100 is realized. The gearbox water channels 34 are within the envelope space of all bolt holes 38. A step is provided at the end of the first inner sub-chamber 321 that is connected to the motor. The connecting end of the side wall of the first inner sub-cavity 321 and the air compressor main unit 100 is provided with a step, and the connecting end of the side wall of the second inner sub-cavity 322 and the air compressor main unit 100 is provided with a step.

In this embodiment, the power water channel is spiral, the axis of the water inlet of the power water channel is tangent to the cylinder in the motor, the water outlet of the power water channel is arranged on the end surface of the power device 500 contacting with the gear box 300, the water inlet of the gear box water channel 34 is arranged on the end surface of the gear box 300 contacting with the power device 500, and the water outlet of the power water channel is butted with the water inlet of the gear box water channel 34, so that the communication between the power water channel and the gear box water channel 34 is realized. The communication mode reduces the arrangement of parts such as connecting water pipes, water pipe connectors and the like, simplifies the whole structure and reduces the flow resistance of a water channel. An O-shaped sealing ring is arranged at the communication position of the power water channel and the gear box water channel 34, and the O-shaped sealing ring is made of fluororubber.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.