CN209180006U - Scroll compressor with seal-oil trap structure - Google Patents

Abstract

The present disclosure provides a scroll compressor having a seal-oil intercepting structure, which includes: a partition unit having an orifice through which the exhaust gas passes and a first sealing surface located at a bottom side of the partition unit and surrounding the orifice; a seal assembly disposed below the diaphragm unit and including a second sealing surface at the top end configured to surround the central bore of the seal assembly, the second sealing surface abutting the first sealing surface to form a seal separating the high pressure side from the low pressure side; and an oil trap device provided at the orifice of the barrier unit to trap oil in the exhaust gas and allow the trapped oil to flow back through the barrier unit. According to the utility model discloses a compressor can be with partly lubricating oil leading-in vortex inside again and/or leading-in low pressure oil pool side again to improve the compression performance and the operating stability of compressor, and still reduce the oil circulation rate.

Description

The screw compressor of oily structure is cut with sealing-

Technical field

The utility model relates to a kind of screw compressors that oily structure is cut with sealing-.

Background technique

The content of this part provides only background information relevant to the disclosure, may not constitute the prior art.

Screw compressor generally includes the compression mechanism being made of determine vortex component and dynamic vortex component.The compression mechanism is used In the working fluid from low-pressure side is compressed into high pressure conditions and is discharged to the outside circulation line through on high-tension side exhaust joint In.In general, the lubricant in compressor forms drop or mist due to the movement of various activities component in compressor and mixes In working fluid.These lubricant droplets or mist being blended in working fluid are drawn into from the air entry of low-pressure side by determining whirlpool The effects of in a series of compression chambers that rotation component and dynamic vortex component limit to play lubrication, sealing, cooling.Finally it is mixed with profit The working fluid of lubrication prescription becomes high pressure conditions (gaseous mixture) by by high-tension side exhaust joint by scroll component compression It enters in the outer loop pipeline except compressor housing.

In order to ensure the compression performance of compressor, it is internally provided in compressor and the inner space of compressor is separated into height Press the partition and corresponding seal assembly of side and low-pressure side.The recess portion on the end plate of determine vortex component is arranged in seal assembly In.Seal assembly (especially floating seal assembly) includes upper plate, lower plate and the sealing element being arranged between upper plate and lower plate, The top of upper plate can against the lantern ring on partition or directly abut partition lower surface be sealed with realize high-pressure side with Effective separation of low-pressure side.However, in the art, still remain reduce system oil circulation, improve the lubrication to turbulent structure, Improve space and the demand of the sealing performance and wear condition between seal assembly and partition (or partition lantern ring).

Utility model content

One purpose of the utility model is to provide a kind of whirlpool that additional lubrication and sealing can be carried out to the inside that is vortexed Revolve compressor.

The another object of the utility model be to provide it is a kind of for screw compressor can improve sealing ring and partition it Between the sealing-of sealing performance of metal to metal seal cut oily structure.

A further object of the utility model be to provide it is a kind of for screw compressor can reduce sealing ring and partition it Between the sealing-of abrasion in metal to metal seal face cut oily structure.

The further object of the utility model is to provide a kind of scroll compression of management that can be conducive to compressor lubricant oil Machine.

One aspect according to the present utility model provides a kind of screw compressor, comprising: separator unit, separator unit Go out the gas vent that gas passes through and the primary sealing area positioned at the bottom side of separator unit with supply and discharge；And seal assembly, it is close Sealing assembly is arranged in below separator unit and includes the second sealing for being configured about the centre bore of seal assembly on top Face, secondary sealing area form the sealing for separating high-pressure side and low-pressure side against primary sealing area, and screw compressor also wraps Include oil-cutting device, oil-cutting device is arranged at the gas vent of separator unit to retain the oil in discharge gas and allow to be retained Oil is back through separator unit.

Optionally, separator unit includes the bottom side for limiting the partition of gas vent and partition being arranged in around gas vent The bottom surface of wear-resistant gasket, wear-resistant gasket provides primary sealing area.

Optionally, separator unit includes partition with a central hole and the additional dress that is mounted in the centre bore of partition It sets, attachment device limits the gas vent and primary sealing area of separator unit.

Optionally, attachment device is sealing ring, and the central aperture of sealing ring limits the gas vent of separator unit, and seals The bottom surface of ring provides primary sealing area.

Further, attachment device may include sealing ring and the cylinder that is integrated or separately formed with sealing ring, and cylinder encloses Central aperture around sealing ring upwardly extends, and at least one hole of the gas vent as separator unit is provided on cylinder Mouthful, the bottom surface of sealing ring provides primary sealing area.

Optionally, oil-cutting device is arranged in cylinder to intercept to by cylinder in a manner of the internal diameter across cylinder Oil in the discharge gas of at least one aperture discharge.

Alternatively, oil-cutting device is integrally enclosed on the outside of cylinder above sealing ring.

Optionally, at least one aperture is arranged on the side wall of cylinder.Oil-cutting device can be respectively set in separate form In at least one aperture described on cylinder.

Preferably, the top of seal assembly extends radially inwardly the wall surface of the centre gangway more than separator unit, and pushes up The inward flange at end is provided with the protruding portion that the radially inner side in the wall surface of the centre gangway of separator unit projects upwards, wherein prominent Receive at least part of the oil dripped from oil-cutting device between portion and the wall surface of centre gangway there are gap out.

As needed, at least one oilhole can be set in sealing ring, and the quantity of oilhole and position are set to be suitable for connecing The oil from the oil-cutting device is received, and oilhole is positioned in the radially inner side for being located at sealing under assembled state.

Oilhole can be the through-hole that cylindrical hole, back taper through-hole or upper end have expansion mouth.

Oil guide groove can be set on sealing ring, and oil guide groove is located above oilhole for receiving from oil-cutting device drippage Oil and oil is directed in oilhole.

Preferably, the groove being also provided on the top of seal assembly between secondary sealing area and protruding portion, Groove is located in the assembled state below oilhole, to receive the oil from oilhole and gap.

Cylinder can be structured as the silencer cover for being suitable for reducing exhaust noise.

Oil-cutting device can be the filter device with strainer.Filter device can be integral type filter device, can It is adapted to according to the arrangement of the gas vent of the separator unit in tabular, dome shape, coniform or have top tubular；When partition list When member has multiple gas vents, filter device is also possible to be separately positioned on the dress of the split type filtering at the gas vent of separator unit It sets.

Oil-cutting device can be multi-layered textile fabric screen or Multilayer metal wire filter screen.

Seal assembly can be the floating seal coil assembly in the recess portion being arranged at the determine vortex end plate of screw compressor, And top is provided by the upper plate of floating seal coil assembly.

It is metal to metal seal between primary sealing area and secondary sealing area.

As an advantageous effects, compressor according to the present utility model be can be realized to lubricating oil/refrigerant mixture Compressed secondary separation, and using leakage path lubricating oil imported again vortex it is internal to be vortexed it is internal be lubricated with it is close Envelope, improves the working performance and reliability of vortex.

As another advantageous effects, the oil that compressor according to the present utility model can also allow a part to retain out is utilized The leakage path generated between metal to metal seal face by the reasons such as deformation or relative motion imports low pressure oil sump side again, This can further increase the stability and compression performance of compressor operation: on the one hand, the lubricating oil isolated being guided to close Oil seal is carried out at metal to metal seal face between seal and partition, to improve sealing performance；On the other hand, Neng Gouyin It leads lubricating oil to be lubricated the metal to metal seal face between sealing ring and partition, thus caused by reducing because of relative motion Abrasion.

It thus reduces oil due to reducing the oil-containing ratio in compressor discharge gas as another advantageous effects and follows Ring rate reduces the management that oil recycle ratio is conducive to compressor lubricant oil, is conducive to improve systematic difference reliability and performance.

Detailed description of the invention

By description referring to the drawings, the feature and advantage of one or several embodiments of the utility model will become It obtains easier to understand.Attached drawing as described herein is only for purpose of explanation and is not intended to limit in any way practical Novel range, attached drawing are not necessarily drawn to scale, and can zoom in or out some features to show the details of particular elements.In attached drawing In:

Fig. 1 is the longitudinal section view of conventional screw compressor；

Fig. 2 a is to schematically show the longitudinal section view that pressure is distributed in screw compressor shown in Fig. 1；

Fig. 2 b is a kind of decomposition view of double plate floating seal coil assemblies；

Fig. 2 c schematically shows the metal to metal seal portion between partition and seal assembly；

Fig. 3 a is the partial sectional view of the screw compressor of first embodiment according to the present utility model；

Fig. 3 b is the sectional block diagram of the upper plate of the seal assembly with protruding portion；

Fig. 3 c is the partial sectional view of the improved form of screw compressor shown in Fig. 3 a, is sealed including shown in Fig. 3 b The upper plate of component, and with the travelling route of the lubricating oil in arrows discharge gas；

Fig. 4 a is the partial sectional view of the screw compressor of second embodiment according to the present utility model；

Fig. 4 b is the partial sectional view of the improved form of screw compressor shown in Fig. 4 a, is sealed including shown in Fig. 3 b The upper plate of component；

Fig. 5 a is the perspective view of the noise reduction component in the third embodiment applied to the utility model；

Fig. 5 b is the partial sectional view of the screw compressor of third embodiment according to the present utility model；

Fig. 5 c be show third embodiment according to the present utility model separator unit and another group of filter device The three-dimensional cutaway view of conjunction form；

Fig. 5 d be include separator unit and filter device in Fig. 5 c screw compressor partial sectional view；

Fig. 5 e is the partial sectional view of the improved form of screw compressor shown in Fig. 5 d, including close shown in Fig. 3 b The upper plate of sealing assembly, and with the travelling route of the lubricating oil in arrows discharge gas；

Fig. 6 a be include office that the sealing-of the 4th embodiment according to the present utility model cuts the screw compressor of oily structure Portion's cross-sectional view；And

Fig. 6 b is the partial sectional view of the improved form of screw compressor shown in Fig. 6 a, including close shown in Fig. 3 b The upper plate of sealing assembly.

Specific embodiment

The description of the various embodiments of the utility model is only exemplary below, and is definitely not to the utility model And its application or the limitation of usage.In various figures the same reference numerals are used to designate identical component, thus it is identical The construction of component will not be repeated again.

The total structure and operation logic of screw compressor will be described referring to Fig.1 first.As shown in Figure 1, screw compressor 100 (can also be known as compressor sometimes below), generally comprised shell 110.Shell 110 may include the ontology of general cylindrical shape 111, the top cover 112 of 111 upper end of ontology, the bottom cover 114 below ontology 111 and setting are set in top cover 112 and this The inner space of compressor is separated into the partition 116 of high-pressure side and low-pressure side between body 111.Such as schematically show in Fig. 2 a Out, the space composition high-pressure side HC between partition 116 and top cover 112, and the space of the scroll component periphery of 116 lower section of partition Then constitute low-pressure side LC.Low-pressure side LC is provided with the inlet suction port 118 for sucking fluid, HC, which is provided with, in high-pressure side is used for The exhaust joint 119 of compressed fluid is discharged.The motor 120 being made of stator 122 and rotor 124 is provided in shell.Turn Drive shaft 130 is provided in son 124 to drive the compression mechanism being made of determine vortex component 150 and dynamic vortex component 160.Determine whirlpool Rotation component 150 includes the seperated annular construction member 154 for being used to form recess portion 158 being arranged in above end plate.Exist in annular construction member 154 Inside defines exhaust passage 152.The space of exhaust passage 152 also constitutes high-pressure side HC.

In order to realize the compression of fluid, need effectively to seal between determine vortex component 150 and dynamic vortex component 160, and Good lubrication is also required between each movable part.

As an importance of compressor seal, in general, being provided in the recess portion 158 of determine vortex component 150 close Sealing assembly (such as floating seal coil assembly) S.That is, seal assembly S is arranged between partition 116 and determine vortex component 150.Sealing Component S is cooperatively formed together with recess portion 158 and is provided the back pressure cavity BC of back pressure for determine vortex component 150, and the pressure in back pressure cavity is low In high-pressure side but it is higher than low-pressure side, that is, intermediate pressure zone MC.

As shown in Figure 2 b, seal assembly S may include upper plate S1, lower plate S2 and be arranged between upper plate S1 and lower plate S2 First seal S3 and second seal S4.The shape of seal assembly S and the shape of recess portion 158 are substantially corresponding, so that first is close Sealing S3 can be realized against the radially inner side wall of recess portion 158 and be sealed, and second seal S4 can be against the radial direction of recess portion 158 Lateral wall realizes sealing.In addition, the top S11 of upper plate S1 can be (such as follows against the anti-wear component being mounted on partition 116 The bottom side of wear-resistant gasket described in text or sealing ring) or the sealing of partition 116 is directly abutted to realize sealing and then realize high Pressure side and low-pressure side separate, and Fig. 2 c shows the metal to metal seal portion M- between the top S11 of upper plate S1 and partition 116 M.Metal to metal seal portion in compressor operation, between upper plate S1 and partition 116 or the anti-wear component of partition 116 There can be micro relative motion between two sealing surfaces of M-M, to adapt to the micro shaking of scroll component in the process of running.

To ensure that the relative motion in compressor between all parts smoothly carries out, the internal activity to compressor is needed Element especially compression assembly provides good lubrication.In the example of vertical vortex shown in Fig. 1, in compression case The bottom of body is stored with lubricant (common for lubricating oil).Correspondingly, it is formed in drive shaft 130 substantially axially extending along its Channel, that is, be formed in the centre bore 136 of 130 lower end of drive shaft and extend up to 132 end face of cam pin from centre bore 136 Eccentric orfice 134.The end of centre bore 136 is immersed in the lubricating oil of compressor housing bottom or is otherwise supplied to profit Lubricating oil.In the operation process of compressor, one end of centre bore 136 supplies lubricating oil by oil feeding device, into center The lubricating oil in hole 136 is subject to centrifugal forces in 130 rotary course of drive shaft and is pumped or is thrown in eccentric orfice 134 simultaneously And the end face for reaching up to cam pin 132 is flowed up along eccentric orfice 134.The lubricating oil being discharged from the end face of cam pin 132 Along unloading bushing 142 and cam pin 132 between gap and unloading bushing 142 and hub 162 between gap to flow down In the dynamic recess portion 146 for reaching main bearing seat 140.Be gathered in a part of lubricating oil flow in recess portion 146 pass through base bearing 144 to Lower flowing, a part of lubricating oil are stirred by hub 162 and move upwards the downside of the end plate 164 of arrival dynamic vortex component 160 simultaneously The thrust surfaces of end plate with the translation rotation of dynamic vortex component 160 throughout dynamic vortex component 160 and main bearing seat 140 it Between.In the operation process of compressor, the lubricating oil on various activities component being supplied in compressor be thrown out of and splash with Form drop or mist.These lubricating oil drops or mist (mainly freeze the working fluid sucked from inlet suction port 118 is blended in Agent) in.These subsequent working fluids for being mixed with lubricating oil drop are inhaled into determine vortex component 150 and dynamic vortex component 160 Between compression chamber in realize lubrication, sealing and the cooling of these scroll elements.Finally it is mixed with the working fluid of lubricating oil Become high pressure conditions (gaseous mixture) by scroll component compression, enters pressure via exhaust passage 152 and exhaust joint 119 In outer loop pipeline except contracting casing body.

As previously described, because between the partition 116 of compressor and the metal to metal seal portion M-M of seal assembly S, there are micro- Amount is shaken, this inevitably leads to the deformation of sealing surface and wear problem.If the metal to metal seal face deforms Can then there be leakage-gap, it is bigger deform more serious then leakage rate, and then compressor performance is caused to decline, especially frequency conversion is compressed The decline of machine low speed run time behaviour.And the abrasion in metal to metal seal face between seal assembly S and partition 116 is same to lead The decline of fine and close sealing property.

Therefore, inventors realized that, if it is possible to further improve the partition 116 of existing compressor and the gold of seal assembly Sealing effect will be advantageous between category-metallic sealing section with reducing pressure leakage.Further, if it is possible to be sealing ring It will be more favorable that metal to metal seal face between partition 116, which provides lubricant effect to reduce the abrasion of sealing surface,.

In addition, existing partition-floating seal ring organization plan is almost without lubricating oil/refrigerant mixture in high-pressure side Secondary separation.The lubricating oil of mixing in the refrigerant can be expelled directly out compression after being inhaled into scroll component (scroll compression body) Machine forms system oil circulation, therefore the management of system oil internal circulating load all concentrates on compressor low-pressure side i.e. vortex suction side, oil The difficulty of loop control is larger, it is therefore desirable to be able to further improve the control to oil circulation, it is difficult to the control of oil circulation to reduce Degree.

Inventor based on the above principles and thinking, proposes a kind of improved sealing-and cuts oily structure to solve the above problems At least one of, here, " sealing-cut oily structure " is intended to refer to the diaphragm structure of screw compressor and matched close The overall structure that sealing assembly is constituted.

Sealing-involved in the utility model, which is described, now with reference to Fig. 3 a to Fig. 6 b cuts oily structure.

In the present invention, seal assembly S essentially consists in upper plate relative to the improvements of the seal assembly S in Fig. 2 b Therefore the structure of S1 for lower plate and sealing element, will not be described in great detail herein.

Oily structure is cut according to the sealing-of the utility model first embodiment referring to Fig. 3 a detailed description.The sealing- Cutting oily structure includes: partition 116, is similar to partition shown in Fig. 1, limits supply and discharge and go out the centre bore 116a that gas passes through (in this embodiment, centre bore 116a corresponds to the centre gangway of separator unit B according to the present utility model, also corresponds to The gas vent B1 of separator unit B), the bottom of partition 116 around centre bore 116a be disposed with wear-resistant gasket 10 with provide than every The more wear-resisting sealing surface M1 of plate itself (for convenient for differentiation, hereinafter referred to as primary sealing area M1)；Seal assembly S, this is close The top S11 of the upper plate S1 (for example, see Fig. 2 b) of sealing assembly S include around centre bore S5 for it is the first of partition 116 close Cover M1 leans to constitute hermetically sealed sealing surface M2 (hereinafter referred to as secondary sealing area M2)；Filter device F is (right Should be in oil-cutting device according to the present utility model), filter device F is mounted on above the centre bore 116a of partition 116 and covers Entire centre bore 116a is covered (here, it can be appreciated that filter device F also may be mounted inside centre bore 116a, and can be only A part for covering centre bore 116a, as long as filter device F is enabled to retain certain oil), to filter from center Lubricating oil in the gaseous mixture of hole 116a discharge.As previously described, these gaseous mixtures are substantially by works such as coolants Make fluid and lubricating oil composition, by the filtering of filter device F, at least part lubricating oil in mixed gas is filtered And it remains on filter device F.The oil droplet remained on filter device F can drip downwards under the effect of gravity or along every The wall surface of the centre bore 116a of plate 116 flows downward into exhaust passage, so pass through exhaust passage be back to vortex it is internal with To being vortexed, inside is lubricated and seals, and improves the compression performance and reliability of vortex systems.In addition, due to passing through filter device F has intercepted the lubricating oil in discharge gas, so that the oil-containing ratio in compressor discharge gas is substantially reduced, therefore reduces oil Cycling rate.This is very favorable for the management of compressor lubricant oil and raising systematic difference reliability and performance: the One, (heat exchanger efficiency is more for the small efficiency for being conducive to improve entire refrigerating/heating circulation of oil-containing ratio in compressor discharge gas It is high)；Second, compressor discharge gas in oil-containing ratio it is small be conducive to maintain compressor inside oil mass, improve compressor operation Reliability.

As an improvement project, inventor is susceptible to can be by tying the upper plate S1 of common seal assembly S Slightly change on structure further to utilize intercepted lubricating oil.As shown in figure 3b, a kind of improved upper plate is provided S1'.For upper plate S1, the top of upper plate S1 ' further inward radially extends, until extending beyond in partition 116 The wall surface of heart hole 116a (centre gangway).Wherein, be formed as the ring higher than secondary sealing area M2 in the inner edge portion of upper plate S1 ' Shape protruding portion S12 and make between the wall surface of centre bore 116a of annular protrusion S12 in the assembled state and partition 116 Will there are gaps, by the way that this gap is arranged, can to form annular groove between annular protrusion S12 and partition 116, the ring Shape slot will play the role of oil storage tank.It preferably, as shown in Figure 3b, can also be in secondary sealing area M2 and annular protrusion S12 Between be set lower than the groove S10 of secondary sealing area M2.It should be noted that the presence of groove S10 be beneficial to it is intercepted Lubricating oil can better play the effect of oil storage tank, however it is imperative that it, which is not, in the accumulation on the top of upper plate S1 ' , in some cases, in order to simplify the structure of upper plate S1 ' or save manufacturing cost, it is convenient to omit groove S10.

As Fig. 3 c shows the construction after the upper plate S1 in first embodiment to be substituted for upper plate S1 ', wherein upper plate S1 Annular protrusion S12 be located at partition 116 centre bore 116a (being equivalent to centre gangway) inside and annular protrusion S12 Outer wall and centre bore 116a inner wall between there are gaps.Setting in this way, the profit under allowing to be filtered by filter device F Some is dropped onto the gap between the wall surface of the centre bore 116a of annular protrusion S12 and partition 116 lubricating oil, and in turn It is received and is stored by the groove S10 of upper plate S1.It is contemplated that in the case where being not provided with groove S10, a part of drippage Lubricating oil will be stored in the annular groove between the wall surface of the centre bore 116a of annular protrusion S12 and partition 116, at this point, ring Space between the wall surface of the centre bore 116a of shape protruding portion S12 and partition 116 will play the role of oil storage tank.

A variety of advantageous effects will be brought by being deposited on a part of lubricating oil on oil storage tank, firstly, it can be metal-metal Sealing M-M provides additional oil sealing effect, exists especially at metal to metal seal portion M-M for example due to deformation Etc. in the case where the poor sealing position that generates of reasons, the lubricating oil of accumulation will improve the sealing effect at these poor sealing positions Fruit；Secondly, metal to metal seal portion M-M can be because of relative motion when in the process of running micro shaking occurs for scroll component (especially on longitudinal direction) and there is minim gap, accumulate in parts of lubricating oil in oil storage tank high-pressure side and low-pressure side it Between differential pressure action under via the minim gap be squeezed out metal to metal seal portion M-M, and then flow back into low-pressure side and It is back to compression motor spindle oil sump；Third, if oil mass in oil storage tank exceeds the capacity of the oil storage tank, excessive oil can be with It spills into internal to be back to vortex except annular protrusion S12.In figure 3 c, for ease of understanding, it is shown with arrow mixed Close the glide path of lubricating oil in object.

In other words, oily structure is cut using above-mentioned sealing-, by the increase filter device F partition centre bore 116a at and The upper plate of seal assembly S is simply improved, it is compressed to lubricating oil/refrigerant mixture secondary in addition to can be realized Separate the management consequently facilitating compressor lubricant oil, additionally it is possible to which the oil for allowing to retain out is back to vortex inside or imports again low Pressure oil pond side, while providing additional oil seal to metal to metal seal portion M-M and then reducing pressure leakage, therefore, mention significantly The high stability and compression performance of compressor operation.

In addition, in the foregoing embodiment, providing the wear-resistant gasket 10 and seal assembly S positioned at 116 bottom of partition Upper plate S1 or upper plate S1 ' directly contact it is gas-tight seal to be formed, in this way, due to avoiding the straight of partition 116 and seal assembly S Contact, therefore requirement of the partition 116 to material wear ability is reduced, material cost can be saved.However, for this field skill It is evident that also can be omitted the wear-resistant gasket 10 for art personnel, and keep the upper plate S1 of partition 116 and seal assembly S direct Contact is to form sealing.

It is pointed out here that in addition to the filter device of mesh form may be used as according to the present utility model section of oil Except device, other the suitable devices that can retain and separate the oil particles in discharge gas, such as guide plate also can be used With rotation cylinder or other feasible gs-oil separators etc..In the case where including strainer, screen material can be any applicable Material, such as the combination that can be any textile fabric strainer or hardware strainer with multi-layer structure or both.

Additional element may be additionally provided in some practical applications, at partition 116 to provide improved performance, it is described Additional element may be mounted at the centre bore 116a of partition 116 and form sealing cooperation with centre bore 116a and provide resistance to The primary sealing area M1 of mill.For ease of description, hereinafter, partition 116 and be mounted at partition 116 for providing the The combination of the structure (for example, wear-resistant gasket 10 described above) of one sealing surface M1 will be simply referred to as " separator unit B ".And it is above-mentioned Additional element will be referred to collectively as " attachment device ", such as can be individual sealing ring, can also be its with sealing flange His functional assembly.

As an example, separator unit B includes partition 116 and cooperation in partition in second embodiment shown in figure 4a Sealing ring 20 (corresponding to attachment device) in 116 centre bore 116a, the outer peripheral surface and centre bore 116a shape of the sealing ring 20 It is good gas-tight seal to provide at being interference fitted.In the case, the central aperture 23 of sealing ring 20 limits separator unit B Gas vent B1 (and being equivalent to centre gangway), and the lower surface of sealing ring 20 provides the with the upper plate S1 of seal assembly S The primary sealing area M1 that two sealing surface M2 are matched.The filter device F of dome shape is mounted on sealing ring 20 and covers sealing The central aperture 23 of ring 20, to filter the lubricating oil from the gaseous mixture being discharged in central aperture 23.Here, dome shape Filter device F is not limited to only as an example, it is intended to illustrate that the shape of filter device F can change according to actual needs Tabular in first embodiment.In this configuration, some is directly in sealing ring 20 by the oil liquid intercepted Central aperture mouth 23 drips back into vortex inside, and some oil liquid will converge to the bottom end of filter device F then along central aperture It is internal that 23 inner wall is back to vortex.

In this embodiment, it will be special for the upper plate S1 of seal assembly S being replaced with upper plate S1 ' as shown in figure 3b It is advantageous.As shown in Figure 4 b, the annular protrusion S12 of upper plate S1 ' is located at the central aperture 23 (i.e. centre gangway) of sealing ring 20 Radially inner side and there are gaps between the wall surface of central aperture 23, thus allow the lubrication filtered out by filter device F It receives and stores in the gap that oil droplet is fallen between annular protrusion S12 and the wall surface of central aperture 23 and by groove S10, from And allows lubricating oil flow by sealing M-M or spill into except annular protrusion S12 to realize such as in first embodiment In the effect that can be provided.Here, due to using the filter device F in dome configuration the lubricating oil filtered out will be made more Converge to bottom hence into oil storage tank to big degree.Those skilled in the art are easy to imagine that, in addition to dome-shaped, This purpose can also be realized using such as cone or other advantageous shapes.

On this basis, enter oil storage tank to advantageously promote the lubricating oil in filter device F, it can also be to sealing ring 20 are improved further, such as shown in Figure 4 b, are provided in the flange of sealing ring 20 and connect with the groove S10 of upper plate S1 ' Logical oilhole 21, the oilhole 21 are located at the lower edge of filter device F, just can receive the profit flowed down along filter device F Lubricating oil.In the mounted state, oilhole 21 is located at the radially inner side of metal to metal seal portion M-M.More advantageously, in sealing ring 20 The upper surface of flange be also provided with oil guide groove 22, the oil guide groove is convenient for receiving the lubricating oil dripped from filter device F simultaneously And lubricating oil will be guided to enter in the oil storage tank S10 of oilhole 21 and then arrival upper plate S1.However, it is contemplated that in upper plate S1 ' The not set groove S10 in top in the case where, the annular protrusion S12 of upper plate S1 ' and central aperture 23 (i.e. centre gangway) Annular groove between wall surface will play the role of oil storage tank, while a part of oil can also be stored in oilhole 21, in oilhole 21 Oil can equally play the role of providing metal seal part M-M additionally oil-tightening, and when primary sealing area M1 and second is close When generating radial clearance between cover M2, oilhole 21 will be connected with annular groove, and oily at least part received by the two will It flows and mixes on secondary sealing area M2, a part will be flowed into low-pressure side, some will remain in oilhole 21 or ring In shape slot.

Preferably, in the assembled state, the bottom end of filter device F, oil guide groove 22, oilhole 21 and groove S10 are vertical It is aligned as much as possible on direction, to efficiently receive and guide the lubricating oil filtered out to reach oil storage tank.Optionally, oilhole 21 can To be provided with one or more, the position of oil guide groove 22 and quantity can be corresponding with the position of oilhole 21 and quantity, or lead Oil groove 22 is also possible to penetrate through an individual toroidal cavity of each oilhole 21.

Fig. 5 a to 5e shows the alternatively possible form that sealing-according to the present utility model cuts oily structure.This In three embodiments, separator unit B is provided with the cylinder integrated or separately formed with sealing ring (such as sealing ring 20).Or Say, in this embodiment, attachment device is no longer individual sealing ring 20, but by sealing flange (being equivalent to sealing ring) and The noise reduction component (anti-wear component) 30 of cylinder composition, the flange of the noise reduction component 30 is fitted snugly in centre bore 116a and is mentioned For primary sealing area M1 and center port 34, at this point, the inner passage of center port 34 and cylinder collectively forms separator unit B Centre gangway, Fig. 5 a shows the schematic diagram of noise reduction component 30.In practical applications, noise reduction group is set at centre bore 116a Part helps to reduce the exhaust noise of compressor.As shown in the figure, the top of noise reduction component 30 is closed, and only has distribution Multiple gas vents 33 of the gas vent B1 as separator unit B on the side surface, therefore as a kind of optional mounting means, As shown in Figure 5 b, filter device F can be mounted at the center port 34 of noise reduction component 30, completely or partially to cover Center port 34 is to intercept to the lubricating oil in the discharge gas by multiple gas vents 33.

In addition, it is contemplated that on this basis, the upper plate S1 of seal assembly S can also be replaced with as shown in figure 3b Upper plate S1 '.(not shown) in the assembled state, the annular protrusion S12 of upper plate S1 ' are located at the center port of noise reduction component 30 34 radially inner side and there are gaps between the wall surface of center port 34, thus allows the profit filtered out by filter device F Lubricating oil is dripped and is stored between annular protrusion S12 and the wall surface of central aperture 23, to generate as in the first embodiment Achieved technical effect.Similarly, in this case, it can be envisaged that it is low that filter device F is arranged to intermediate high surrounding Configuration such as dome-shaped or cone are more received in turn in order to flow the oil filtered out around in filter device F Collection.

Fig. 5 c to Fig. 5 e shows the optional mounting means of another kind of filter device F, as shown in Figure 5 c, filter device F It is no longer but to be adapted on the cylindrical flange for being mounted on noise reduction component 30 and only completely around entire noise reduction component Surround the gas vent 33 on side wall.Fig. 5 d shows assembled state figure, in this embodiment, it is desirable to provide is arranged in noise reduction group Oilhole 31 on the flange of part 30, to make the lubricating oil in filter device F be back to the path inside being vortexed for providing.

As depicted in fig. 5e, if the upper plate S1 of seal assembly S is replaced with upper plate S1 ' as shown in figure 3b, in assembling shape Under state, oilhole 31 is located at the radially inner side of metal to metal seal portion M-M.The oilhole 31 will provide the road being imported into oil storage tank Diameter also shows the flow path of gas and lubricating oil in mixture respectively with hollow arrow and filled arrows in Fig. 5 e.In addition, The oil guide groove 32 arranged corresponding to oilhole 31 is also shown in Fig. 5 e, as previously described, oil guide groove 32 is not necessary, and The arrangement of oilhole 31 and oil guide groove 32 can have a variety of different alternative forms and be not limited to it is shown here go out.

In addition, although oilhole 21 and 31 is shown in the form of cylindrical hole, so in the attached drawing of the utility model And those skilled in the art are also easy to imagine that various various forms of remodeling, such as in order to preferably collect and guide Lubricating oil, oilhole can also be in back taper, or be also possible to the top configuration cylindrical for back taper expansion mouth, lower part Deng such oilhole configuration will be advantageous in the case where being not provided with oil guide groove.

In this embodiment, the flange of noise reduction component 30, which serves as, provides the so-called anti-wear component of primary sealing area M1.

Particularly, to those skilled in the art it is evident that the configuration of filter device can be according to separator unit It constructs and designs in an advantageous manner, as long as filter device can be realized effective mistake to the mixed gas being discharged from separator unit Filter, and it is by no means limited to the configuration gone out given in embodiment hereof.

In addition, filter device F also can have split type construction.As an example, Fig. 6 a, which shows sealing-, cuts oily structure 4th embodiment, in this embodiment, attachment device replace with the cylinder at least one side opening 43 by noise reduction component 30 Shape component 40.However, the cylindrical part in tubular component 40 is also possible to other components with side opening, for example, its can be by What frame surrounded is used to support the bracket of strainer, is also possible to any device with other additional functions (including but not limited to Aforementioned silencer cover).In this embodiment, filter device F is entirely enclosed on the outside of centre bore 116a, but with more The form of a independent individual is directly installed in corresponding side opening 43.It is excellent possessed by the filter device F of this split type construction Point is it will be evident that can for example save filtering material, reduce production cost, the filter element at one is needed repairing or replaced When, the filter element can be only maintained or replace, to reduce update and maintenance cost.

Preferably, a part of oil retained out via filter device F can along cylindrical part inner wall to flowing down It is dynamic to be back to vortex inside.Furthermore it is also possible to it is envisaged that for the ease of by the lubricating oil in filter device F more Ground guidance is back to vortex inside, at least one oilhole 41 can be arranged at the base flange of tubular component 40, oilhole 41 Quantity and position preferably correspond to quantity and the position of side opening 43.In the assembled state, oilhole 21 is located at metal to metal seal The radially inner side of portion M-M.Can permit a part of oil retained out via filter device F in this way can also be along the outer of cylindrical part Wall, which flows downward, is back to vortex inside.

If the upper plate S1 of seal assembly S, which is replaced with upper plate S1 ' as shown in figure 3b in the case, then to be allowed By a part of oil guidance retained out via filter device F to low-pressure side.It is guided to will preferably filter the lubricating oil in device F Into oilhole 41 and oil storage tank, it can be arranged in the lower section for the side opening 43 for being equipped with filter device F and be connected to oilhole 41 at least One vertical guiding groove 44, the improved form is as shown in Figure 6b.

Although those skilled in the art will also be appreciated that in the illustrative embodiments while being provided with oilhole and Oil guide groove, but oil guide groove be not be indispensable structure, can be omitted in the appropriate case, or can from be suitable for by oil to The other structures of oilhole guidance replace.

The various embodiments and modification of the utility model have been described in detail above, but those skilled in the art answer The understanding, the utility model are not limited to above-mentioned specific embodiment and modification but may include that other are various possible Combination and combination, may be effected by one skilled in the art other without departing from the spirit and scope of the utility model Modification and variant.All these modifications and variant are both fallen in the scope of the utility model.Moreover, all structures described herein Part can be replaced by component equivalent in other technologies.

Claims (22)

1. a kind of screw compressor, comprising:

There is supply and discharge to go out gas vent that gas passes through and positioned at the bottom side of the separator unit for separator unit, the separator unit Primary sealing area；And

Seal assembly, the seal assembly be arranged in below the separator unit and top include be configured about it is described The secondary sealing area of the centre bore of seal assembly, the secondary sealing area form separation high pressure against the primary sealing area The sealing of side and low-pressure side,

It is characterized in that,

The screw compressor further includes oil-cutting device, and the oil-cutting device is arranged at the gas vent of the separator unit to cut It stays the oil in the discharge gas and allows retained oil back through the separator unit.

2. screw compressor according to claim 1, wherein the separator unit include limit the gas vent every Plate and be arranged in around the gas vent partition bottom side wear-resistant gasket, the bottom surface of the wear-resistant gasket provides institute State primary sealing area.

3. screw compressor according to claim 1, wherein the separator unit include partition with a central hole and The attachment device being mounted in the centre bore of the partition, the attachment device limit the separator unit gas vent and The primary sealing area.

4. screw compressor according to claim 3, wherein the attachment device is sealing ring, in the sealing ring Central aperture mouth limits the gas vent of the separator unit, and the bottom surface of the sealing ring provides the primary sealing area.

5. screw compressor according to claim 3, wherein the attachment device include sealing ring and with the sealing The cylinder that ring is integrated or separately formed, the cylinder is upwardly extended around the central aperture of the sealing ring, and the cylinder On be provided at least one aperture of the gas vent as the separator unit, it is close that the bottom surface of the sealing ring provides described first Cover.

6. screw compressor according to claim 5, wherein the oil-cutting device is across the side of the internal diameter of the cylinder Formula is arranged in the cylinder to intercept to the discharge gas by least one aperture discharge described on the cylinder In oil.

7. screw compressor according to claim 5, wherein the oil-cutting device integrally wraps above the sealing ring It is trapped among on the outside of the cylinder.

8. screw compressor according to claim 5, wherein the side wall of the cylinder is arranged at least one described aperture On.

9. screw compressor according to claim 8, wherein the oil-cutting device is separately positioned on described in separate form In at least one described aperture on cylinder.

10. screw compressor according to any one of claim 1 to 9, wherein the top diameter of the seal assembly To the inward flange of the wall surface for the centre gangway for extending inwardly past the separator unit, and the top be provided with it is described every The protruding portion that the radially inner side of the wall surface of the centre gangway of plate unit projects upwards, wherein the protruding portion and it is described in Entreat at least part for receiving the oil dripped from the oil-cutting device between the wall surface in channel there are gap.

11. the screw compressor according to any one of claim 4,7 and 9, wherein be provided at least in the sealing ring One oilhole, the quantity of the oilhole and position are set to be suitable for receiving the oil from the oil-cutting device, and the oilhole It is positioned in the radially inner side for being located at the sealing under assembled state.

12. screw compressor according to claim 11, wherein the oilhole be cylindrical hole, back taper through-hole or Upper end has the through-hole of expansion mouth.

13. screw compressor according to claim 11, wherein oil guide groove is provided on the sealing ring, it is described to lead Oil groove is located above the oilhole for receiving the oil dripped from the oil-cutting device and oil being directed in the oilhole.

14. screw compressor according to claim 11, wherein the top of the seal assembly extends radially inwardly Inward flange more than the wall surface of the centre gangway of the separator unit, and the top is provided with the institute in the separator unit State the protruding portion that the radially inner side of the wall surface of centre gangway projects upwards, wherein the wall of the protruding portion and the centre gangway At least part of the oil dripped from the oil-cutting device is received between face there are gap.

15. screw compressor according to claim 14, wherein be provided with and be located on the top of the seal assembly Groove between the secondary sealing area and the protruding portion, the groove are located in the assembled state below the oilhole, with Receive the oil from the oilhole and the gap.

16. the screw compressor according to any one of claim 5 to 9, wherein the cartridge body configuration is to arrange suitable for reducing The silencer cover of gas noise.

17. screw compressor according to any one of claim 1 to 4, wherein the oil-cutting device is with strainer Filter device.

18. screw compressor according to claim 17, wherein the filter device is integral type filter device, described Filter device can be adapted in tabular, dome shape, coniform or have top according to the arrangement of the gas vent of the separator unit Tubular.

19. screw compressor according to claim 17, wherein when the separator unit has multiple gas vents, institute Stating filter device is the split type filter device being separately positioned at the gas vent of the separator unit.

20. screw compressor according to claim 17, wherein the oil-cutting device is multi-layered textile fabric screen or more Layer braid fabric.

21. screw compressor according to any one of claim 1 to 9, wherein the seal assembly is to be arranged described The floating seal coil assembly in recess portion at the determine vortex end plate of screw compressor, and the top is by the floating seal ring The upper plate of component provides.

22. screw compressor according to any one of claim 1 to 9, wherein the primary sealing area and described second Sealing surface constitutes metal to metal seal.