DE2822780A1 - ROTARY COMPRESSORS - Google Patents

Description

282278Q

THE HYDROVANE COMPRESSOR COMPANY, LIMITED

Claybrook Drive, Washford Industrial Estate, Redditch, Worcestershire B98 ODS, England

ROTARY LISTON COMPRESSORS

The invention relates to a rotary piston compressor with an oil seal, in which at least one rotor air is compressed inside a stator, into which oil is injected, in order to produce the. Lubricate moving parts and to maintain an adequate seal between them, the oil subsequently being removed from the air will.

The invention is directed to a rotary lobe compressor with an oil seal, which is characterized by a Rotor-stator assembly with at least one rotor and one stator having at least one outlet for

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Compressing a mixture of air and oil; through a Impact shield, which is arranged at a distance from the rotor-stator assembly and adjacent at least to the outlet of the Stator lies; by a swamp shield of essentially circular cross-section showing the rotor-stator assembly surrounds; and by an outer housing of substantially circular cross-section; being the space between the rotor-stator assembly and the outer housing also at least one end filter tubular Type accommodates; and wherein further the compressor is designed so that the air laden with oil from the Exit rotor-stator assembly, hit the baffle, pass through the final filter and off can get there to a housing outlet, while the oil can settle in a sump that is from the lower part of the swamp shield is formed.

In a further development of the invention, a rotary piston compressor with oil separation is created, which is characterized by a rotor-stator assembly with at least one rotor and a stator for compressing a mixture of air and oil; by an impact shield of at least partially circular cross-section which at least partially surrounds the rotor-stator assembly; by a sump shield of essentially circular cross-section which surrounds the baffle shield; by a final separation shield made of air-permeable material, which is also substantially circular in cross-section and surrounds the sump shield; and by an outer housing surrounding the final separator shield; the compressor being designed in such a way that the oil-laden air from the rotor / stator assembly goes to the inside and from there to the outside

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282278Q

side of the baffle shield and the sump shield and through the final separation shield to a housing outlet can get while the oil can collect in a sump that comes from the lower part of the impingement and of the swamp shield is formed.

In common compressors of the type under discussion here, in which the oil is extracted from the air in two stages is removed, of which the second comprises at least one tubular filter, it is customary to use a molded part or cast part for the rotor-stator assembly and a further molded part or cast part for the second separation stage to provide, or to use a single molding or casting of complex shape to to accommodate both the rotor-stator assembly and the final separator.

The compressor according to the invention offers the possibility of accommodating all compressor components in a single housing of circular cross-section, ideally in a simple cylindrical housing. In addition to being more aesthetically pleasing, such a design can also excellently withstand significant air pressures. It also leads to considerable material and labor savings, since the molding or casting process is greatly simplified.

Further advantages and features of the invention emerge from the following description of preferred exemplary embodiments in connection with the enclosed Drawing. The drawing shows in:

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-ΙΟ-

Figure 1 is a schematic longitudinal section through part of a rotary piston compressor according to the invention with eccentric blades;

FIG. 2 shows a section similar to FIG. 1 through a modified compressor construction;

Figure 3 shows a cross section along the line 3-3 in Figure 2j

Figure i * again a section similar to Figure 1 through another modified compressor design;

FIG. 5 shows a cross section along the line 5-5 in FIG.

Figure 1 shows a schematic representation of the working section of a compressor with an inlet 2, the can be throttled or closed by a common relief valve 4, which under the The effect of a pressure is, which in turn is controlled by a servo valve 6, specifically as a function of the compressor pressure or discharge pressure so that the inlet is closed when the compressor pressure is over increases a predetermined value lying above the normal working pressure. The compressor also includes a minimum pressure valve 8, which prevents the pressure inside the compressor below a predetermined one Minimum value drops, in the event that, for example, the pressure line 10 should break. A more accurate one Description of these components should be superfluous.

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The compressor comprises a conventional rotor-stator assembly in which a stator 12 forms a cylinder in which a rotor Ik rotates about an axis which is offset from the center of the cylinder. The rotor has a number of displaceable blades 16. The rotor-stator assembly is fastened between a front molded part 1 and a rear molded part 20. The molded parts receive the ends of the rotor-stator assembly and are screwed together. A drive shaft 22 for connection to a motor passes through the front end molded part 18, while a shaft journal 24 is received in a bearing of the rear end molded part 20. Air is drawn through the inlet 2 in the rear end-face molding into the working spaces into which the crescent-shaped space between the rotor and the stator is divided by the blades. Oil is injected into the air and the mixture of air and oil, after compression, is discharged through a series of outlets 26 formed at the top of the stator 12.

At a distance from the stator 12, a primary, impact shield 28 sits above the stator outlets 26. Its cross section is part of a circle and is essentially the same length as the stator. It extends around around the stator about 1/8 of the stator circumference. Further it is provided on the sides with downwardly directed flanges 30 which are connected to the stator 12. Approximately in the middle of the primary impact shield are two

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openings 32 are provided. Most of the from the The compressed gas exiting the stator will therefore pass through these openings 32.

A secondary impact shield 34 is arranged at a distance outside the primary impact shield. It owns the shape of a circular tube section open at the ends and is coaxial with the rotor-stator assembly arranged on a rib of the stator. However, its ends are at a distance from the frontal ones Molded parts. The tubular secondary impact shield is in turn surrounded by a swamp shield 36 circular cross-section, which is also arranged coaxially to the rotor-stator assembly. The ends of the sump shield are opposite to the two end-face molded parts by respective sealing rings 38 sealed. The swamp shield 36 has a circular depression 39 in the center of its upper surface which carries a number of holes 40 in its side wall. Above the recess 39 is a reversed channel-shaped cover 42 is arranged, the side legs of which with the outer surface of the sump shield 36 are connected. The cover 42 extends approximately around 2/3 of the circumference of the swamp shield and is open at the ends. Around the swamp shield is an endr filter 44 arranged circular cross-section, which consists of ceramic material and also between the two end molded parts is held. Sealing rings 45 are used to seal it off. Ultimately, the entire arrangement described is contained in a substantially cylindrical outer housing 46 added.

In operation, therefore, the space between the lower forms

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Part of the sump shield 36 and the outside of the stator 12 is a substantially semi-cylindrical oil sump. This oil sump is essentially under the compression pressure, which ensures that the oil is injected through nozzles (not shown) into the compressed air in order to lubricate the blades or slide plates 16 and the other compressor parts in the usual way. The oil-laden, compressed air in the rotor-stator assembly is discharged through the outlets 26 of the stator 12 and impinges on the inside of the primary impact shield. A large part of the oil contained in the air is deposited there, and this drips down between the lower edge of the flanges 30 and the stator 12 into the sump. The air flows towards the center of the primary baffle shield and through the openings 32 and hits the inside of the secondary baffle shield 34, which means that a further portion of the oil carried along by the air collects or flows together. This oil also drips down into the swamp. The compressed air flows around both ends of the secondary baffle 34 and then out through the holes 40 into the interior of the lid 42. The compressed air then flows circumferentially to both sides within the lid 42 and passes through its open ends to the outside into the Annular space between the sump shield 36 and the end separator 44. The air passes through the end separator and from there to an outlet 48. Any oil droplets remaining in the air will flow together in the end filter 44 and trickle down to the bottom of the outer housing 46. An oil return line 50 is provided to bring this accumulated 01 back to the air intake.

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The invention thus provides a compressor with a simple external shape and an integrated internal one Education. The coaxial arrangement of the various components avoids the need for two form- or cast housings or a single complex Pormoder cast housing, which reduces manufacturing costs sink.

The construction described works with parallel flow, i.e. the air in each step of the path from the rotor-stator assembly to the housing outlet in two parallel flows (and in opposite Directions). Accordingly, the different rooms stand alternately at their ends and in the center of the various signs in connection with each other. This has the advantage that the speed the air flow is kept relatively low, which increases the separation efficiency the baffle plates and the final filter increased. However, in certain circumstances it may be preferable to to use a single flow path system with only a single air flow in each stage is available. It should be noted that it is possible according to the invention, the compressor adapt to working with a single current path by arranging the various signs in this way that the connection between the annular spaces is created alternately at the ends of the signs,

Figures 2 and 3 show a modified construction of the compressor, in which the same components are provided with the same reference numerals. It is

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here a compressor with a single current path. The air emerging from the stator 12 hits the primary impact shield 28 and travels to the right end of the compressor (seen in FIG. 2) and from there to the left end, namely the latter between the primary impact shield 28 and the secondary impact shield 3 ^. The air then flows back to the right, between the secondary baffle shield - ^z J) k and the sump shield 36. It should be noted that in this construction the secondary baffle shield forms only part of a circle, it being sufficient that that Impact shield with its two edges immersed in the oil of the sump in order to ensure a satisfactory function of the compressor.

In this design, a single large final filter is not used, but instead six smaller tubular filters 52 connected to the front face of the compressor. The air around the right end (seen in Figure 2) of the sump shield flows around, passes through one of the tubular filters 52 and arrives from there out to outlet 28 of the compressor. As with the first embodiment, the sump is in the room between the stator and the sump shield. The oil that is separated from the end filters 52, drips down around the outside of the sump shield 36 and collects at the bottom of the housing 46. This oil is then fed to the compressor inlet by means of the oil return line 50 supplied.

Figures 4 and 5 show a further modified one

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Embodiment in which the separate swamp shield is omitted. With this construction, what is separated by the primary and secondary baffle plates drips oil down to the bottom of the outer housing 1 | 6, which serves as a sump. Here, too, is the second Pralischild 3 ^ only as part of a circular cross-section formed, with its edges dipping into the Cl of the f-vinpfes.

A partition wall 5 ^ is provided above the swamp shields; which together with the outer housing forms a partial annulus. This sub-annulus contains six tubular end filters 52 attached to the rear of the compressor. As described above, the air emerging from the stator travels through one of the end filters 52 and from there through the outlet 48 through. The attachment of the Eadfilter to the rear of the compressor and not to the front has the advantage that the filters are more easily accessible for maintenance or replacement are.

The exemplary embodiments according to FIGS. 2 to 5 are shown as systems with a single flow path and has been described. According to the invention, similar designs are possible as systems with parallel flow paths.

The invention was explained in connection with a compressor, the eccentrically rotating blades identifies, but the invention is equally applicable, for example, to screw compressors or the like.

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In summary, the invention creates a rotary piston compressor with an oil seal, which has a rotor-stator assembly, the at least one rotor and a stator provided with at least one outlet to supply a mixture of air and Cl compress. Furthermore, an impact shield arranged at a distance from the stator is provided, as well as a Bogshid of circular cross-section, which the Surrounds rotor-stator assembly. Furthermore, an outer housing is of substantially circular cross-section available. The space between the rotor-stator assembly and the outer housing takes up at least one tubular Filter on.

The compressor is aesthetically pleasing and quite capable of withstanding considerable pressures. His Construction leads to considerable material and labor savings.

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Claims (1)

THE HYDROVANE COMPRESSOR COMPANY, LIMITED Claybrook Drive, Washford Industrial Estate, Redd itch, Worcestershire E98 ODS, England PATENT CLAIMS Pi. J rotary lobe compressor with oil seal, characterized by a rotor-stator assembly with at least one rotor (14) and a stator (12) having at least one outlet (26) for compressing a mixture of air and oil; by a baffle shield (28,3 ¹ O, which is arranged at a distance from the rotor-stator assembly and is adjacent at least to the outlet (26) of the stator (12); by a sump shield (36) of substantially circular cross-section, which the Rotor-stator assembly 809849/0844 ORIGINAL INSPECTED surrounds; and by an outer housing (46) of irr. substantially more circular. Cross-section; wot · ei '1er · room zviL see the Potor stater assembly and i · - · "outer housing (46) other than the rundesten ^ a ~ .ri fiitt-r · '44;. au 52) finished pipe construction... fr; inrrit; un .: wöbe: furthermore the verlichter is designed in such a way, ia .: the air laden with oil emerge from the rotor-Ctator-B'i-group, hit the impact shield, pass through the final filter and from there to a housing outlet (48), while the oil can settle in a Sunpf fcc, which is formed by the lower part of the L-UT.pfshildes. 2. Rotary piston compressor according to claim 1, characterized in that that the outer housing (46) forms the sump shield. 3. Rotary piston compressor according to claim 1, characterized in that that the space between the swamp shield (36) and the outer housing (46) for receiving the final filter (44) or the final filter (52). 4. Rotary piston compressor according to one of claims 1 to 3j characterized, that the Frallschild (28; 34) in cross section at least forms part of a circle. 5. Rotary piston compressor according to one of claims 1, 3 or 4, characterized, that a single final filter (44) of substantially circular cross-section is provided which the 809849/0844 282278Q Surrounds swamp shield (36). 6. Rotary piston compressor according to one of claims 1 to 4, characterized, since a plurality of end filters (52) in the upper section ⁴ : of the Rauras between the rotor-stator assembly ■ χΐ-Λ ie: :), outer housing (46) is provided. ?. Rotary piston compressor according to claim 6, characterized in that that the final filters (52) are attached to the drive end of the compressor. 8. Rotary piston compressor according to claim 6, characterized in that that the final filters (52) are attached to the inlet side of the compressor. 9. Rotary piston compressor with oil seal, in particular according to one of claims 1 to 8, characterized by a rotor-stator assembly with at least one rotor ' ( 14) and a stator (12) for compressing a mixture of air and oil; by a baffle shield (28,3 * 0 of at least partially circular cross-section which at least partially surrounds the rotor-static assembly; by a sump shield (36) of substantially circular cross-section which surrounds the baffle shield; by an end separation shield (44 ) made of air-permeable material, which is also essentially circular in cross-section and surrounds the swamp shield; and through 809849/0844 an outer housing surrounding the final separator shield (46); wherein the compressor is designed so that the air laden with oil from the rotor-stator assembly to the inside and from there to the outside of the impact shield and the Sunpfschild and through the final separation shield to a housing outlet (4?) can get while the oil can collect in a sump that comes from the lower part of the impingement and of the swamp shield is formed. 10. Rotary piston compressor according to claim 9, characterized in that that the impact shield (34) has a circular cross-section. 11. Rotary piston compressor according to claim 9 or 10, characterized in that that the impact shield (3 ¹ O, the swamp shield (36) and the Separation shield (44) are arranged coaxially. 12. Rotary piston compressor according to one of claims 9 to 11, characterized, that two end walls (18, 20) are provided, between which the final separator shield (44) is clamped. 13. Rotary piston compressor according to one of Claims 1 to 12, marked by means (50) for transporting the separated oil that settles on the bottom of the outer housing (46) has collected to the inlet (2) of the compressor. 809849/0844 ■ 28 2-27 * 0 14. Rotary piston compressor according to one of claims 9 to 13, characterized, that the outer housing (46) has a circular cross-section is. 15. Rotary piston compressor according to one of claims 1 to 3 or 14, characterized, that the outer housing (46) is cylindrical 16. Rotary piston compressor according to one of claims 1 to 15, characterized, that two baffle shields (28,34), one within the other, are provided. 17. Rotary piston compressor according to claim 16, characterized in that since the edges of the inner impact shield (28) are connected to the stator (12), while the outer ' Impact shield (34) extends downward beyond the height at which the level of the oil is in operation. swamp is located. 18. Rotary piston compressor according to one of claims 1 to 17, characterized, that it is a single flow path construction. 809849/084 * 282278Q 19. Rotary piston compressor according to one of claims 1 to 17, characterized in that it is a construction with double or parallel flow paths acts. 20. Rotary piston compressor according to one of claims 1 to 19, characterized in that the final separator shield (44) is made of coalescing Material. 21. Rotary piston compressor according to claim 20, characterized in that that the coalescing material is a ceramic material 809849/0844