CN210290132U

CN210290132U - Air compressor

Info

Publication number: CN210290132U
Application number: CN201822203348.7U
Authority: CN
Inventors: 张广东; 吴跃东
Original assignee: Shanghai Yi Yuan Compressor Co ltd
Current assignee: Shanghai Yi Yuan Compressor Co ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-04-10
Anticipated expiration: 2028-12-26

Abstract

The utility model relates to an air compressor, including the casing, locate in the casing and intermeshing's cloudy screw rod and positive screw rod, the profile of tooth of cloudy screw rod and positive screw rod is asymmetric convex. The utility model discloses an air compressor has increaseed the external diameter and the length of rotor through design and theoretical calculation, and the rotor has adopted the line type of new design to make its leakproofness good, the low power dissipation, efficient.

Description

Air compressor

Technical Field

The utility model relates to a gas equipment especially relates to an air compressor.

Background

An air compressor is an apparatus for compressing gas, and includes an oil-free air compressor and an oil-injected air compressor. The air compressor generally includes a casing, and a female rotor and a male rotor that are provided in the casing and engaged with each other, one end of the male rotor is driven to rotate by an external motor, and the female rotor is connected to the male rotor through a synchronizing gear mechanism, thereby achieving rotation. When the gas compressor works, gas is input from one end of the female rotor and one end of the male rotor, and compressed gas is output from the other end of the female rotor and the other end of the male rotor along with the rotation of the rotors, so that the compression and pressurization of the gas are realized. When the rotor profile of the existing oil-free air compressor is designed, the meshing gap between the female rotor and the male rotor is large, the compression cavity of the oil-free compressor does not have a lubricating oil sealing meshing gap as an oil injection compressor when in work, and the oil-free compressor mainly achieves the sealing purpose by the rotor rotating speed of thousands to tens of thousands of revolutions. If the meshing clearance between the female rotor and the male rotor is too large, the high rotating speed of the rotors cannot achieve good sealing effect, and gas can flow from the gas outlet to the gas inlet in the compression process in serious cases. Because the gas is compressed and the temperature of the gas is higher than the ambient temperature, the gas which flows by reaches the gas inlet and is sucked into the rotor to be compressed again, and part of the gas which flows by the meshing gap flows to the gas inlet after being compressed, the temperature of the gas is repeatedly increased, so that the power consumption is increased, and the compression efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing an air compressor that the leakproofness is good, the low power dissipation, efficient.

The utility model discloses an air compressor, including the casing, locate casing and intermeshing's cloudy screw rod and positive screw rod, the profile of tooth of cloudy screw rod and positive screw rod is asymmetric convex, the both ends of cloudy screw rod and positive screw rod are provided with the oil blanket subassembly respectively, the oil blanket subassembly include with the oil blanket support of casing adaptation with locate the sealing bush in the oil blanket support, oil blanket support and sealing bush are both ends opening, inside hollow tubular structure, and sealing bush's medial surface is equipped with the helicla flute.

Further, the utility model discloses an air compressor, the tooth top diameter of positive screw rod is 83.93 millimeters, and the tooth root diameter of positive screw rod is 48.8 millimeters, the tooth top diameter of cloudy screw rod is 74.9 millimeters, and the tooth root diameter of cloudy screw rod is 39.71 millimeters.

Further, the utility model discloses an air compressor, the tooth top diameter of male screw rod is 125.8 millimeters, and the tooth root diameter of male screw rod is 70.99 millimeters, the tooth top diameter of cloudy screw rod is 110.11 millimeters, and the tooth root diameter of cloudy screw rod is 53.85 millimeters.

Further, the utility model discloses an air compressor, the addendum diameter of positive screw rod is 140.4 millimeters, and the dedendum diameter of positive screw rod is 78.56 millimeters, the addendum diameter of cloudy screw rod is 122.2 millimeters, and the dedendum diameter of cloudy screw rod is 59.21 millimeters.

Further, the utility model discloses an air compressor, the addendum diameter of positive screw rod is 192.9 millimeters, and the dedendum diameter of positive screw rod is 105.5 millimeters, the addendum diameter of cloudy screw rod is 167.9 millimeters, and the dedendum diameter of cloudy screw rod is 78.83 millimeters.

Further, the utility model discloses an air compressor, the addendum diameter of positive screw rod is 236 millimeters, and the dedendum diameter of positive screw rod is 136.5 millimeters, the addendum diameter of cloudy screw rod is 204.5 millimeters, and the dedendum diameter of cloudy screw rod is 103.5 millimeters. Further, the utility model discloses an air compressor is provided with the first outside flange of outstanding seal bush lateral surface on the seal bush, is equipped with the first inboard flange of outstanding oil blanket support medial surface on the oil blanket support, is provided with the sealing washer between first inboard flange and the first outside flange.

Further, the utility model discloses an air compressor, oil blanket support's medial surface is provided with the constant head tank, be provided with first resilient means in the constant head tank, first resilient means contacts with first outside flange and oil blanket support respectively.

Further, the utility model discloses an air compressor still includes the gas seal subassembly, the gas seal subassembly is located one side that the oil blanket subassembly is close to the compression chamber, and the gas seal subassembly includes sealed dish, is located the sealing ring of sealed dish both sides, is equipped with the outside flange of second on the lateral surface of sealing ring, and the outside of sealing ring still overlaps there is second resilient means, the inboard of oil blanket support is equipped with the inboard flange of second, and in two sealed rings, the terminal surface of one of them sealing ring offsets with the side of sealed dish, the terminal surface of another sealing ring with the inboard flange of second offsets, the side of sealed dish still with the terminal surface of oil blanket support offsets.

Further, the utility model discloses an air compressor, first resilient means and second resilient means are wave spring.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage: the utility model discloses an air compressor, through design and theoretical calculation, has increaseed the external diameter and the length of rotor, and the rotor has adopted the line type of new design. Compared with the old rotor, the rotor of the screw has the advantages that the shape of the tooth surface is improved, the tooth profile of the asymmetric arc surface greatly improves the compression efficiency of the rotor, the leakage gap is reduced, and compared with the old rotor, a large amount of energy is saved due to the improvement of the specific power when the rotor is used. The bottom diameter of the rotor is redesigned from 50.1mm to 48.8mm, the length of the rotor profile is redesigned from 107.9 to 117.9, the exhaust volume is increased by more than 10%, and the exhaust temperature is reduced by about 20 ℃. The integral performance specific power of the air compressor is original 8 KW/(m)³The/min) is increased to 7.0-7.2 Kw/(m)³/min)。

To sum up, the utility model discloses an air compressor leakproofness is good, the low power dissipation, efficient.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

FIG. 1 is a cross-sectional view of an air compressor of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a perspective view of the oil seal assembly;

FIG. 4 is a cross-sectional view of the oil seal assembly;

FIG. 5 is a front view of the oil seal assembly;

FIG. 6 is a perspective view of a wave spring;

FIG. 7 is a perspective view of the male screw;

fig. 8 is a left side view of the male screw.

Wherein, 1: a housing; 2: a female screw; 3: a male screw; 4: an oil seal assembly; 5: an oil seal bracket; 6: a seal bushing; 7: a helical groove; 8: a first outboard flange; 9: a first inboard flange; 10: a seal ring; 11: a compression chamber; 12: positioning a groove; 13: a first elastic device; 14: an oil drainage hole; 15: a gas seal assembly; 16: sealing the disc; 17: a seal ring; 18: a second outboard flange; 19: a second elastic device; 20: a second inboard flange.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1 to 8, the present invention relates to an air compressor, which comprises a housing 1, a female screw rod 2 and a male screw rod 3, wherein the female screw rod 2 and the male screw rod are engaged with each other, and the tooth profiles of the female screw rod and the male screw rod are asymmetric circular arcs.

Specifically, the tooth profile of the male screw is formed by two asymmetrically arranged circular arcs, one circular arc protrudes out of the other circular arc, a smaller gap is formed between the circular arc and the bottom surface of the thread groove of the female screw, a larger gap is formed between the other circular arc surface of the tooth profile of the male screw and the bottom surface of the thread groove of the female screw, the larger gap increases the air quantity and efficiency of the air compressor, the smaller gap ensures the air tightness between the female screw and the male screw, the phenomenon of reverse crossing of air is prevented, and therefore the air quantity and the efficiency of the air compressor are increased under the condition of ensuring the air tightness.

Preferably, in the air compressor of the present invention, the tooth tip diameter of the male screw is 83.93 mm, the tooth root diameter of the male screw is 48.8mm, the tooth tip diameter of the female screw is 74.9 mm, and the tooth root diameter of the female screw is 39.71 mm.

Preferably, in the air compressor of the present invention, the tooth tip diameter of the male screw is 125.8 mm, the tooth root diameter of the male screw is 70.99 mm, the tooth tip diameter of the female screw is 110.11 mm, and the tooth root diameter of the female screw is 53.85 mm.

Preferably, in the air compressor of the present invention, the tooth tip diameter of the male screw is 140.4 mm, the tooth root diameter of the male screw is 78.56 mm, the tooth tip diameter of the female screw is 122.2 mm, and the tooth root diameter of the female screw is 59.21 mm.

Preferably, in the air compressor of the present invention, the diameter of the tooth tip of the male screw is 192.9 mm, the diameter of the tooth root of the male screw is 105.5 mm, the diameter of the tooth tip of the female screw is 167.9 mm, and the diameter of the tooth root of the female screw is 78.83 mm.

Preferably, in the air compressor of the present invention, the tooth tip diameter of the male screw is 236 mm, the tooth root diameter of the male screw is 136.5 mm, the tooth tip diameter of the female screw is 204.5 mm, and the tooth root diameter of the female screw is 103.5 mm.

The arrangement of the bottom diameter and the profile length of the rotor is combined with the tooth form of the asymmetric arc, so that the air displacement of the air compressor is increased by more than 10 percent, the exhaust temperature is reduced by about 20 ℃, and the integral performance specific power of the air compressor is changed from the original 8 KW/(m)³The/min) is increased to 7.0-7.2 KW/(m)³/min)。

As preferred, the utility model discloses an air compressor, the both ends of negative screw rod and positive screw rod are provided with oil blanket subassembly 4 respectively, and oil blanket subassembly includes 5 with the oil blanket support of casing adaptation and locates the seal bush 6 in the oil blanket support, and oil blanket support and seal bush are both ends opening, inside hollow tubular structure, and seal bush's medial surface is equipped with helicla flute 7.

The arrangement of the spiral groove further strengthens the sealing effect of the oil seal assembly. Generally, the oil seal assembly is a labyrinth seal, however, since there is a certain clearance between the oil seal assembly and the screw, although the clearance is relatively small, it always has a certain leakage. Moreover, the labyrinth seal mechanism does not provide a corresponding effect in sealing the oil by the rotation speed of the screw. And the utility model discloses an oil blanket subassembly, its inside helicla flute that is provided with, air compressor during operation, because the rotation of positive screw rod, the oil film that is located between positive screw rod lateral surface and the seal bush medial surface produces thereupon and rotates, because the direction of helicla flute is opposite with the turning to of screw rod, like this, along with the rotation of positive screw rod, the oil film just removes to the direction of keeping away from the interior compression chamber of casing along the helicla flute, thereby make machine oil more be difficult to leak to the compression intracavity of casing through the small clearance between seal bush and the screw rod, thereby the sealed effect of oil blanket subassembly has been improved.

Preferably, the utility model discloses an air compressor is provided with the first outside flange 8 of outstanding seal bush lateral surface on the seal bush, is equipped with the first inboard flange 9 of outstanding oil blanket support medial surface on the oil blanket support, is provided with sealing washer 10 between first inboard flange and the first outside flange.

The setting of sealing washer can prevent effectively that machine oil from passing through in the clearance infiltration compression chamber 11 between seal bush and the oil blanket support.

Preferably, the utility model discloses an air compressor, oil blanket support's medial surface is provided with constant head tank 12, is provided with first resilient means 13 in the constant head tank, first resilient means respectively with first outside flange and oil blanket support contact.

The arrangement of the first elastic device enables the sealing ring to be compressed between the first outer side flange and the first inner side flange, so that the sealing effect of the sealing ring is enhanced.

As preferred, the utility model discloses an air compressor has seted up draining hole 14 on the lateral wall of oil blanket support, and draining hole site is close to one side in compression chamber in the sealing bush.

The arrangement of the oil drainage hole enables engine oil leaked from the sealing bush to be directly discharged out of the shell, and therefore the engine oil is effectively prevented from permeating into the compression cavity.

As preferring, the utility model discloses an air compressor still includes gas seal subassembly 15, the gas seal subassembly is located one side that the oil blanket subassembly is close to the compression chamber, the gas seal subassembly includes sealed dish 16, be located the sealing ring 17 of sealed dish both sides, be equipped with second outside flange 18 on the lateral surface of sealing ring, the outside of sealing ring still overlaps there is second resilient means 19, the inboard of oil blanket support is equipped with second inside flange 20, in two sealed rings, the terminal surface of one of them sealing ring offsets with the side of sealed dish, the terminal surface and the inboard flange of second of another sealing ring offset, the side of sealed dish still offsets with the terminal surface of oil blanket support.

Parts such as sealed dish, sealing ring form labyrinth seal structure, and current labyrinth atmoseal is monolithic structure, compares in current atmoseal subassembly, the utility model discloses an atmoseal subassembly constitutes the sealed dish in labyrinth and sealing ring is the disconnect-type to make the sealing ring be in the floating condition, the sealing ring just can the automatic adjustment with the axiality of screw rod like this, reduced the requirement of atmoseal subassembly on the installation accuracy. Specifically, when a certain eccentricity is generated between the seal ring and the screw, the gap between the seal ring and the screw is very small, so that the rotating screw generates a radial force on the seal ring, and the seal ring and the screw are enabled to recover the coaxiality. Because the sealing ring can realize automatic coaxial, the requirement on the installation precision is greatly reduced. When the sealing device works, one sealing ring is tightly attached to the sealing disc under the action of the second elastic device, the outer edge of the sealing disc is tightly attached to the end face of the oil seal support under the action of sealing exchange, and the sealing ring on the other side of the sealing disc is tightly attached to the inner side flange of the second in the oil seal support under the action of the other elastic device, so that a labyrinth sealing structure is formed, and gas leakage in a compression cavity is prevented.

Preferably, the surface of the male screw and the surface of the female screw of the air compressor of the utility model are coated with flexible medium layers.

The arrangement of the flexible medium layer can prevent hard friction between the sealing ring and the screw rod and prevent the sealing ring from being damaged or generating excessive heat.

Preferably, the flexible medium layer of the air compressor of the present invention is made of teflon.

Preferably, the first elastic device and the second elastic device of the air compressor of the present invention are both wave springs.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that the invention can be implemented in other specific forms by a person skilled in the art without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.

Furthermore, the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention. Also, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an air compressor, includes the casing, locates in the casing and intermeshing's cloudy screw rod and positive screw rod, its characterized in that: the tooth profiles of the female screw and the male screw are in asymmetric circular arc shapes, two ends of the female screw and the male screw are respectively provided with an oil seal assembly, the oil seal assembly comprises an oil seal support matched with the casing and a seal bushing arranged in the oil seal support, the oil seal support and the seal bushing are both of tubular structures with two open ends and hollow interiors, and the inner side surface of the seal bushing is provided with a spiral groove.

2. The air compressor of claim 1, wherein: the diameter of the tooth top of the male screw is 83.93 millimeters, the diameter of the tooth root of the male screw is 48.8 millimeters, the diameter of the tooth top of the female screw is 74.9 millimeters, and the diameter of the tooth root of the female screw is 39.71 millimeters.

3. The air compressor of claim 1, wherein: the diameter of the tooth top of the male screw is 125.8 mm, the diameter of the tooth root of the male screw is 70.99 mm, the diameter of the tooth top of the female screw is 110.11 mm, and the diameter of the tooth root of the female screw is 53.85 mm.

4. The air compressor of claim 1, wherein: the diameter of the tooth top of the male screw is 140.4 mm, the diameter of the tooth root of the male screw is 78.56 mm, the diameter of the tooth top of the female screw is 122.2 mm, and the diameter of the tooth root of the female screw is 59.21 mm.

5. The air compressor of claim 1, wherein: the diameter of the tooth top of the male screw is 192.9 mm, the diameter of the tooth root of the male screw is 105.5 mm, the diameter of the tooth top of the female screw is 167.9 mm, and the diameter of the tooth root of the female screw is 78.83 mm.

6. The air compressor of claim 1, wherein: the diameter of the tooth top of the male screw is 236 mm, the diameter of the tooth root of the male screw is 136.5 mm, the diameter of the tooth top of the female screw is 204.5 mm, and the diameter of the tooth root of the female screw is 103.5 mm.

7. The air compressor as set forth in claim 4, wherein: the sealing bush is provided with a first outer side flange protruding out of the outer side face of the sealing bush, the oil seal support is provided with a first inner side flange protruding out of the inner side face of the oil seal support, and a sealing ring is arranged between the first inner side flange and the first outer side flange.

8. The air compressor as set forth in claim 7, wherein: the inner side surface of the oil seal support is provided with a positioning groove, a first elastic device is arranged in the positioning groove, and the first elastic device is respectively contacted with the first outer side flange and the oil seal support.

9. The air compressor as set forth in claim 8, wherein: still include the gas seal subassembly, the gas seal subassembly is located one side that the oil blanket subassembly is close to the compression chamber, and the gas seal subassembly includes sealed dish, is located the sealing ring of sealed dish both sides, is equipped with the outside flange of second on the lateral surface of sealing ring, and the outside of sealing ring still overlaps there is second resilient means, the inboard of oil blanket support is equipped with the inboard flange of second, and in two sealed rings, the terminal surface of one of them sealing ring offsets with the side of sealed dish, the terminal surface of another sealing ring with the inboard flange of second offsets, the side of sealed dish still with the terminal surface of oil blanket support offsets, first resilient means and second resilient means are wave spring.