CN202300924U

CN202300924U - Compressor

Info

Publication number: CN202300924U
Application number: CN2011201037715U
Authority: CN
Inventors: 吴继宝; 孙庆丰
Original assignee: Emerson Climate Technologies Inc
Current assignee: Copeland LP
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2012-07-04
Anticipated expiration: 2021-03-31

Abstract

The utility model discloses a compressor which comprises a casing, a crankshaft, a lower bearing, an oil receiver and an oil pump, wherein the crankshaft is vertically arranged in the casing and is provided with an upper end part, a lower end part and an oil supply channel arranged in a way of penetrating through the upper end part and the lower end part; the lower bearing is arranged in the casing and can support the lower end part of the crankshaft in the pivoting manner; the oil receiver is arranged in the casing and is arranged close to the lower end part of the crankshaft; the oil pump is provided with an oil inlet, an oil outlet, an oil suction cavity and an oil discharge cavity, the oil inlet is positioned under the oil level of the oil receiver and is in fluid communication with the oil suction cavity, and the oil discharge cavity is in fluid communicated with the oil supply channel at the lower end part of the crankshaft through the oil outlet. The compressor also comprises a pressure equalizing pipe, and further, fluid communication is realized between the space of the pressure equalizing pipe above the oil level of the oil receiver and the oil suction cavity.

Description

Compressor

Technical field

The utility model relates to a kind of compressor, particularly a kind of speed changeable compressor.

Background technique

As shown in Figure 1, the vertical compressor with vertical bent axle adopts centrifugal oil pump widely.As shown in Figure 2, this oil pump is configured to have oil thrower 805 in the inside of the bottom of vertical bent axle 801 usually.Certainly, this type centrifugal oil pump can also have other various designs.

Yet, for this type centrifugal oil pump, oily flow directly with square being directly proportional of speed of crankshaft.Therefore, when rotating speed was high, oil pump was carried a lot of oil, but when rotating speed was low, oil pump was carried oil seldom, even does not have oil.

In order to carry enough oil when the low speed, can carry out various improvement designs.

As shown in Figure 3, U.S. Pat 5,176,506 disclose a kind of improvement oil pump.Even when the rotating speed of bent axle is very low (, angular velocity omega is very low), the diameter of the increase of impeller can increase linear velocity (V=ω * R).Obviously, the diameter of the ratio bent axle 36 that can make of the diameter of impeller 106 is big.

It is successful aspect oily that this improved design obtains enough when low speed.But oil mass can surpass required amount and will cause oily circuit problem when high speed, and is as shown in Figure 4.This shows, for U.S. Pat 5,176,506 oil pumps that disclosed, the rotating speed of bent axle has appreciable impact to oily flow.

The model utility content

The purpose of the utility model provides a kind of compressor, and the oil pump of this compressor can be carried enough and roughly the same oily flow when different speeds of crankshaft, and this oil pump low cost of manufacture and reliability height.

According to the utility model, a kind of compressor is provided, this compressor comprises: housing; Bent axle, it vertically is arranged in the housing and has upper end portion, underpart and run through the upper end portion and the oil supply gallery of underpart setting; Lower bearing, it is arranged in the housing and can the pivot mode to support the underpart of bent axle; Food tray, it is arranged in the housing and is positioned near the underpart of bent axle; And oil pump, it has oil-in, oil export, oily suction chamber and oily discharge side, and the oil-in is arranged under the horizontal plane of oil of food tray and with oily suction chamber fluid and is communicated with, and oily discharge side is communicated with the oil supply gallery fluid of the lower end of bent axle through oil export.Wherein, this compressor also comprises pressure-equalizing pipe, provides fluid to be communicated with between the space on the horizontal plane of the oil of pressure-equalizing pipe in food tray and the oily suction chamber.

Selectively, pressure-equalizing pipe can be arranged in the outside of oil pump and bent axle.

Particularly, compressor can also comprise: lower bearing component, and lower bearing is formed at its top and its underpart extends to form the pump case of oil pump; Impeller assembly; It comprises and is used for being connected so that epimere, the hypomere that is used to form impeller and the stage casing between epimere and hypomere of one rotation with the underpart of bent axle; When impeller assembly is assembled in the pump case; Space between the interior perimeter surface of the outer surface in the stage casing of impeller assembly and pump case forms oily suction chamber, and the space between the interior perimeter surface of the outer surface of impeller and pump case forms oily discharge side; And pump cover, it is assemblied in the pump case and is positioned at the impeller below.

Preferably, a side surface in the stage casing of the adjacent impeller assembly of impeller is provided with at least one guiding gutter; The surface of adjacent impeller one side of pump cover is provided with the static pressure passage; Impeller assembly vertically runs through and is provided with centre gangway, and the upper end of centre gangway forms oil export, and the lower end of centre gangway is communicated with static pressure passage fluid; Wherein, oily suction chamber, guiding gutter, oily discharge side, static pressure passage, centre gangway are in turn connected to form the oil flow channel of oil pump.

Preferably; The inwall of lower bearing component can comprise successively from top to bottom in the first portion that is used to support bent axle perimembranous, internal diameter less than perimembranous and internal diameter in the second portion of perimembranous in the first portion greater than perimembranous in the third part of perimembranous in the first portion; Wherein, The oil suction chamber is formed between the outer surface in the stage casing of perimembranous and impeller assembly in the second portion, and the oil-in of oil pump is radially run through perimembranous in the second portion and formed from the outer wall of lower bearing component.

Preferably, can be further run through radially from the outer wall of lower bearing component that perimembranous forms vent in the second portion, pressure-equalizing pipe is communicated with oily suction chamber fluid via vent.

Particularly, oily discharge side can be formed between the outer surface of interior perimembranous of third part and impeller.

Selectively, pressure-equalizing pipe can be arranged in the inside of oil pump and bent axle.

Particularly, compressor can also comprise: lower bearing component, and lower bearing is formed at its top and its underpart extends to form the pump case of oil pump; Impeller assembly; It comprises and is used for being connected so that epimere, the hypomere that is used to form impeller and the stage casing between epimere and hypomere of one rotation with the underpart of bent axle; The middle body indent of the bottom surface of impeller forms oily suction chamber; When impeller assembly was assembled in the pump case, the space between the interior perimeter surface of the outer surface of impeller and pump case formed oily discharge side; And pump cover, it is assemblied in the pump case and is positioned at the impeller below, and the oil-in is formed by the central openings of pump cover.

Preferably, the surface of contiguous pump cover one side of impeller is provided with at least one guiding gutter; Space between the interior perimeter surface of the outer surface in the stage casing of impeller assembly and pump case forms the static pressure passage; The epimere of impeller assembly vertically runs through the formation oil export; Wherein, oily suction chamber, guiding gutter, oily discharge side, static pressure passage, oil export are in turn connected to form the oil flow channel of oil pump.

Preferably; The inwall of lower bearing component can comprise successively from top to bottom in the first portion that is used to support bent axle perimembranous, internal diameter less than perimembranous, internal diameter in the second portion of perimembranous in the first portion greater than perimembranous and internal diameter in the third part of perimembranous in the first portion greater than perimembranous in the 4th part of perimembranous in the third part; Wherein, The static pressure tunnel-shaped is formed in the second portion between the outer surface of perimembranous and the stage casing of impeller assembly in the perimembranous and third part, and oily discharge side is formed between the outer surface of interior perimembranous of the 4th part and impeller.

Preferably, vertically the perfoliate-leaf wheel assembly forms the centre gangway that is communicated with oily suction chamber fluid, and the lower end of pressure-equalizing pipe is plugged in the centre gangway.

Oil export in the epimere of the impeller assembly that preferably, is communicated with the oil supply gallery fluid impeller assembly radially on be positioned at the outside of centre gangway.

Preferably, can be further form vent in the lower end of bent axle, vent is arranged at the opening on the bent axle outer wall on the horizontal plane of oil of food tray, and the upper end of pressure-equalizing pipe is passed oil supply gallery and is plugged in the part of vent.

Selectively, the diameter of the impeller of oil pump can make greater than the diameter of bent axle has the oil of capacity to be supplied to oil supply gallery when the rotating speed of bent axle hangs down.

Selectively, oil pump can perhaps other can adopt the pump of the utility model characteristic for centrifugal pump, axial-flow pump, displacement pump.

More preferably, lower bearing can be arranged under the horizontal plane of oil of food tray.

More preferably, may further include the foreign body filter that is provided with around the periphery of oil pump.

More preferably, may further include retaining ring, be used for pump cover is remained on pump case.

The beneficial effect of the utility model is: the compressor according to the utility model structure has pressure-equalizing pipe, make can be via the oil-in with identical oily flow to oil pump feed, thereby guaranteed that oil pump can carry identical oily flow when different rotating speed; And, the influence that can carry identical oily flow and oily flow not to receive speed of crankshaft basically when the different speeds of crankshaft according to the oil pump of the utility model structure; In addition, any pump with the utility model characteristic can be carried identical oily flow when different speeds of crankshaft, comprise centrifugal pump, axial-flow pump, displacement pump etc.

Description of drawings

Fig. 1 shows the schematic representation of the compressor of existing technology.

Fig. 2 shows bent axle and the schematic representation of oil thrower of the compressor of existing technology.

Fig. 3 shows the schematic representation of oil pump of the compressor of another existing technology.

Fig. 4 shows the oily flow of compressor oil pump shown in Figure 3 and the plotted curve of the corresponding relation between the speed of crankshaft.

Fig. 5 shows the assembling schematic representation according to the compressor of the utility model.

Fig. 6 shows the decomposing schematic representation according to the part assembly of the oil pump of the compressor of the utility model.

Fig. 7 shows the assembling schematic representation according to the impeller of the oil pump of the compressor of the utility model and bent axle.

Fig. 8 shows the assembling schematic representation according to the pump cover of the oil pump of the compressor of the utility model and lower bearing.

Fig. 9 shows the cross sectional representation at oil-in and vent place according to the lower bearing of the utility model.

Figure 10 shows the fundamental diagram according to the oil pump of the compressor of the utility model.

Figure 11 shows the partial schematic diagram of compressor.

Figure 12 shows according to the oily flow of the oil pump of the compressor of the utility model and the chart of the corresponding relation between the speed of crankshaft.

Figure 13 shows the partial schematic diagram according to the oil pump of the compressor of another mode of execution of the utility model.

Figure 14 shows the schematic representation of the impeller assembly of oil pump shown in Figure 13.

Embodiment

Like Fig. 5 and shown in Figure 6, be equipped with oil pump 500 according to the compressor 100 of the utility model.Compressor 100 comprises housing 110, vertically be arranged in the housing 110 and have upper end portion 124 and underpart 126 bent axle 120, be arranged in the housing 110 and with the lower bearing 140 of the underpart 126 of can the pivot mode supporting bent axle 120 and be arranged in the housing 110 and be positioned near the food tray 180 the underpart 126 of bent axle 120.Bent axle 120 has the oil supply gallery 127 that runs through upper end portion 124 and underpart 126 settings.

As shown in Figure 6, compressor 100 comprises lower bearing component 510, pressure-equalizing pipe 520, impeller assembly 530, pump cover 550, retaining ring 570 and foreign body filter 590.

The top of lower bearing component 510 is formed for supporting the lower bearing 140 of the underpart 126 of bent axle 120, and the bottom extends to form the pump case 515 of oil pump 500.Shown in figure 10, the inwall of lower bearing component 510 comprise successively from top to bottom in the first portion that is used to support bent axle 120 perimembranous 5102, internal diameter less than perimembranous 5104 and internal diameter in the second portion of perimembranous in the first portion greater than perimembranous 5106 in the third part of perimembranous in the first portion.

Impeller assembly 530 comprises and is used for being connected so that epimere 531, the hypomere that is used to form impeller 535 and the stage casing between epimere and hypomere 533 of one rotation with the underpart 126 of bent axle 120.

Wherein, oily suction chamber 5305 is formed between the outer surface in the stage casing 533 of perimembranous 5104 and impeller assembly 530 in the second portion.And oily discharge side 5308 is formed between the outer surface of interior perimembranous 5106 of third part and impeller 535.

In addition, the oil-in 507 of oil pump 500 is radially run through perimembranous 5104 in the second portion and is formed from the outer wall of lower bearing component 510.And, radially run through perimembranous 5104 formation vents 508 in the second portion from the outer wall of lower bearing component 510.As non-limiting example, oil-in 507 is symmetrical set with vent 508.

Please with reference to Fig. 5, Fig. 6 and Figure 10; In this illustrative embodiments, pressure-equalizing pipe 520 roughly is

shape.One end of pressure-equalizing pipe 520 (promptly; The end of the lateral part of

shape) insertion vent 508 makes and is communicated with oily suction chamber 5305 fluids; And the other end (that is the end of the vertical part of

shape) extend to make on the horizontal plane 1808 of the oil in the food tray 180 with food tray 180 in the horizontal plane 1808 of oil on the space fluid be communicated with.

Please with reference to Fig. 6-10, a side surface in the stage casing 533 of the adjacent impeller assembly 530 of impeller 535 is provided with four guiding gutters 5356.The surface of adjacent impeller 535 1 sides of pump cover 550 is provided with static pressure passage 5506.Impeller assembly 530 vertically runs through and is provided with centre gangway 5306, and the upper end of centre gangway 5306 forms oil export 509.The lower end of centre gangway 5306 is communicated with static pressure passage 5506 fluids.Thereby oil-in 507, oily suction chamber 5305, guiding gutter 5356, oily discharge side 5308, static pressure passage 5506, centre gangway 5306, oil export 509 are in turn connected to form the oil flow channel of oil pump 500.In addition, the oil export 509 of oil pump is connected in oil supply gallery 127 with to upper end portion 124 place's fuel feeding at 126 places, underpart of bent axle 120.

As a kind of non-limiting example, the diameter of the impeller 535 of oil pump 500 makes when the rotating speed of bent axle 120 hangs down, have the oil of capacity to be supplied to oil supply gallery 127 greater than the diameter of bent axle 120.

In oil pump 500, impeller assembly 530 rotate with bent axle 120 together and other parts maintenance is static.Two lugs 5315 that epimere 531 places of impeller assembly 530 are provided with engage to guarantee impeller assembly 530 and bent axle 120 rotations with the groove (not label) of the inwall place setting of the underpart 126 of bent axle 120, and are as shown in Figure 7., as shown in Figure 8 in the otch (not label) of the pump case 515 of two ears, the 5505 insertion lower bearing components 510 of pump cover 550 to prevent pump cover 550 rotations.Be provided with in the lower bearing component 510 contour shape and impeller assembly 530 epimere 531 coupling pass through hole 5109, the epimere 531 that is used for confession impeller assembly 530 when assembling passes.Usually, impeller assembly 530 places on the pump cover 550 following of self gravitation effect, and is shown in figure 10.Retaining ring 570 is used for (more properly being in the pump case 515 of lower bearing component 510) maintenance pump cover 550 in lower bearing component 510, and is shown in figure 10.To prevent that around the foreign body filter 590 of the periphery setting of oil pump residue etc. from getting in the oil pump 500.

In the utility model, pressure-equalizing pipe 520 has two functions: function is that the air pressure on the horizontal plane 1808 of the oil in pressure and the food tray of guaranteeing in the oily suction chamber 5,305 180 is identical; Another function is to help to remove the too much refrigerant gas that gets into oil pump inside.

Solid arrow among Figure 10 has shown the motion of oily stream, and dotted arrow has shown flowing of refrigerant gas.

Please with reference to Figure 10, at work, when bent axle 120 rotations, the oil that 2. impeller 535 capture positions are located, and oil outwards flows under action of centrifugal force.Thereby oil droplet obtains kinetic energy and/or increases pressure (2. → 3.).Then, oil droplet is forced to the static pressure passage 5506 (3. → 4.) that gets in the pump cover 550.Next, oil flows through the oil supply gallery 127 (4. → 5. → 6. → 7.) that the centre gangway 5306 of pump cover 550 and impeller assembly 530 gets in the bent axles 120.Although the diameter of impeller 535 is slightly less than the diameter of bent axle 120 in this mode of execution; But in non-limiting example, though the diameter of impeller 535 can equal greater than the diameter of bent axle 120 make guarantee at bent axle 120 rotating speed RPM (rev/min) hour oil droplet can obtain enough energy (speed pressure) thereby move to the top of bent axle 120.

Shown in figure 10; When 2. oil flow to the position 3. the time from the position; Gassy and pressure will equal the air pressure of horizontal plane 1808 tops (like the position among Figure 11 8.) of oil in the food tray 180 because the cause of pressure-equalizing pipe 520, oily suction chamber 5305 (position 2.) will become.Pressure-equalizing pipe 520 has guaranteed that the air pressure of food tray 180 tops will can not exert an influence to the flow velocity of the oil in the oil-in 507.In the oily continuous inflow oil suction chamber 5305 in the effect lower oil pan 180 of gravity (1. → 2.).Flow velocity depends on the height difference H between profit plane 1808 and the oil-in 507, has ignored the influence of oil viscosity here.Usually, height difference H just changes in very narrow scope.In other words, when the compressor steady running, the height difference H substantial constant is constant, thereby can think that flow velocity is constant.

The precondition that can when different speeds of crankshaft, carry identical oily flow is the top that oil pump can pump suctions enough oil to bent axle when making impeller diameter be large enough to guarantee at low speed.Afterwards, through selecting suitable oil-in size, oily flow is adjusted to and can just when friction speed, satisfies lubrication needs.In fact, when low speed, the top that oil pump just can pump be inhaled all oil to bent axle.Simultaneously, when high speed, more oil when oil pump can not pump be inhaled than low speed is because not more oil flows into oily suction chamber 5305.Therefore, speed of crankshaft will can not influence oily flow.

Figure 12 is according to the laboratory data of the oil pump acquisition of the illustrative embodiments of the utility model, has wherein shown the oily flow of oil pump and the corresponding relation between the speed of crankshaft.In the oil pump of this illustrative embodiments, impeller diameter is about: 40MM; The oil-in diameter is about: 7MM; Height difference H is about: 40MM; Oil type is elected as: 46BWMO.

Can find out through laboratory data: (1), any speed more than 1800RPM, oil pump is carried the same traffic of about 10.8 milliliters/second.(2), because the cause of the limited maximum (top) speed of motor, test only proceeds to 3900RPM, in theory, the speed more than 3900RPM also can be carried identical flow, shown in the dotted portion in the chart.(3), when speed is lower than 1800RPM, the top of oil pump all oil to bent axles in can not pump sucking pump chamber, at this moment, oily flow will be directly and square being directly proportional of speed of crankshaft, when rotating speed was too low, oil pump is incited somebody to action fully can not the pump oil suction.

Therefore, the oil pump of design the utility model at first will calculate low speed of crankshaft and the simultaneously required minimum oily flow of high speed of crankshaft.Next to confirm the size of oil-in based on the flow of height difference H and expectation.And then the further feature of definite oil pump.The oil pump that so obtains can be carried identical oily flow when different speeds of crankshaft.

Figure 13,14 has schematically shown the partial schematic diagram of another mode of execution of the utility model.Shown in figure 13, oil pump 500 ' is installed on the underpart 126 ' of bent axle 120 '.Compressor comprises lower bearing component 510 ', pressure-equalizing pipe 520 ', impeller assembly 530 ', pump cover 550 ', retaining ring 570 ' and foreign body filter 590 '.

Similar with first mode of execution, the top of lower bearing component 510 ' is formed for supporting the lower bearing of the underpart 126 ' of bent axle 120 ', and the bottom extends to form the pump case of oil pump 500 '.The inwall of lower bearing component 510 ' comprise successively from top to bottom in the first portion that is used to support bent axle 120 ' perimembranous 5102 ', internal diameter less than perimembranous 5104 ', internal diameter in the second portion of perimembranous in the first portion greater than perimembranous 5106 ' and internal diameter in the third part of perimembranous in the first portion greater than perimembranous 5108 ' in the 4th part of perimembranous in the third part.

Similar with first mode of execution, impeller assembly 530 ' comprises and is used for being connected so that epimere 531 ', the hypomere that is used to form impeller 535 ' and the stage casing 533 ' between epimere and hypomere of one rotation with the underpart 126 ' of bent axle 120 '.

Different with first mode of execution is that the oil-in 507 ' of oil pump 500 ' is formed by the center drilling of pump cover 550 '.Oil suction chamber 5305 ' is formed on the bottom surface of contiguous pump cover 550 ' one side of impeller 535 ', that is, upwards be recessed to form by the middle body of the bottom surface of impeller 535 '.Also be provided with on the bottom surface of impeller 535 ' and radially extend and circumferential six guiding gutters 5356 ' uniformly-spaced arranging in edge, shown in figure 14.These guiding gutters 5356 ' are communicated with oily suction chamber 5305 ' fluid respectively.And impeller assembly 530 ' vertically runs through and is provided with centre gangway 5306 ', and the lower end of this centre gangway 5306 ' is communicated with oily suction chamber 5305 ' fluid.In this exemplary embodiment, the pressure equalizing pipe 520 'substantially "Shu" shape, wherein the pressure equalizing pipe 520' is interposed between the lower end of the central channel, the pressure balance pipe 520 'through the middle of the crankshaft 120' the lower end portion 126 'at a supply oil passage 127', the pressure equalizing pipe 520 'is interposed between the upper end of the crankshaft 120' of the lower end portion 126 'is formed in a substantially

-shaped vent 508 'vertical portion.Wherein, vent 508 ' is arranged at the opening on the bent axle 120 ' outer wall on the horizontal plane of oil of food tray.Thus, the space on the horizontal plane of the oil in the food tray is communicated with oily suction chamber 5305 ' fluid through pressure-equalizing pipe 520 ', shown in the dotted arrow among Figure 13.

In addition, oily discharge side 5308 ' is formed between the outer surface of interior perimembranous 5108 ' of the 4th part and impeller 535 '.Static pressure passage 5506 ' is formed in the second portion between the outer surface in the stage casing 533 ' of perimembranous 5106 ' and impeller assembly 530 ' in the perimembranous 5104 ' and third part.And the epimere 531 ' of perfoliate-leaf wheel assembly 530 ' forms oil export 509 ' in the both sides of centre gangway 5306 '.Thereby; After accomplishing assembling; Oil-in 507 ', oily suction chamber 5305 ', guiding gutter 5356 ', oily discharge side 5308 ', static pressure passage 5506 ', oil export 509 ' are in turn connected to form the oil flow channel of oil pump 500 ', shown in the solid arrow among Figure 13.And then the oil export 509 ' of oil pump is located fluid and is communicated in oil supply gallery 127 ' with the upper end fuel feeding to bent axle 120 ' in the underpart 126 ' of bent axle 120 '.

In this illustrative embodiments, when the oil flow channel (solid arrow) of oil in Figure 13 flows, because the cause of pressure-equalizing pipe 520 ', will become gassy and pressure of oily suction chamber 5305 ' will equal the air pressure of the horizontal plane top of oil in the food tray.Pressure-equalizing pipe 520 ' has guaranteed that the air pressure of food tray top will can not exert an influence to the flow velocity of the oil in the oil-in 507 '.In the oily continuous inflow oil suction chamber 5305 ' in the food tray.Flow velocity depends on the height difference between profit plane and the oil-in 507 ', has ignored the influence of oil viscosity here.Usually, height difference just changes in very narrow scope.In other words, when the compressor steady running, the height difference substantial constant is constant, thereby can think that flow velocity is constant.

Can know that by above analysis second mode of execution and first mode of execution of the utility model have roughly the same technique effect.

Although described the preferred implementation of the utility model in detail at this; But should be understood that the utility model is not limited to the concrete structure of describing in detail and illustrating here, under the situation of essence that does not depart from the utility model and scope, can realize other modification and variant by those skilled in the art.For example; In second mode of execution; The vent 508 ' of centre gangway 5306 ' and shape can be set; But an end of pressure-equalizing pipe is got in the oily suction chamber 5305 ' from the below via oil-in 507 ', and the other end of pressure-equalizing pipe is extended on the horizontal plane of the oil in the food tray.All these modification and variant all fall in the scope of the utility model requirement protection.

Claims

1. compressor comprises:

Housing;

Bent axle, it vertically is arranged in the said housing and has upper end portion, underpart and run through said upper end portion and the oil supply gallery of said underpart setting;

Lower bearing, it is arranged in the said housing and can the pivot mode to support the said underpart of said bent axle;

Food tray, it is arranged in the said housing and is positioned near the said underpart of said bent axle; And

Oil pump; It has oil-in, oil export, oily suction chamber and oily discharge side; Said oil-in is arranged under the horizontal plane of oil of said food tray and with said oily suction chamber fluid and is communicated with, and said oily discharge side is communicated with through the said oil supply gallery fluid of said oil export with the said lower end of said bent axle;

Said compressor is characterised in that,

Said compressor also comprises pressure-equalizing pipe, provides fluid to be communicated with between the space on the horizontal plane of the oil of wherein said pressure-equalizing pipe in said food tray and the said oily suction chamber.

2. compressor as claimed in claim 1 is characterized in that said pressure-equalizing pipe is arranged in the outside of said oil pump and said bent axle.

3. compressor as claimed in claim 2 is characterized in that, said compressor also comprises:

Lower bearing component, said lower bearing is formed at its top and its underpart extends to form the pump case of said oil pump;

Impeller assembly; It comprises and is used for being connected so that epimere, the hypomere that is used to form impeller and the stage casing between epimere and hypomere of one rotation with the said underpart of said bent axle; When said impeller assembly is assembled in the said pump case; Space between the interior perimeter surface of the outer surface in the stage casing of said impeller assembly and said pump case forms said oily suction chamber, and the space between the interior perimeter surface of the outer surface of said impeller and said pump case forms said oily discharge side; And

Pump cover, it is assemblied in the said pump case and is positioned at said impeller below.

4. compressor as claimed in claim 3 is characterized in that, a side surface in the stage casing of the said impeller assembly of vicinity of said impeller is provided with at least one guiding gutter; The surface of said impeller one side of the vicinity of said pump cover is provided with the static pressure passage; Said impeller assembly vertically runs through and is provided with centre gangway, and the upper end of said centre gangway forms said oil export, and the lower end of said centre gangway is communicated with said static pressure passage fluid; Wherein, said oily suction chamber, said guiding gutter, said oily discharge side, said static pressure passage, said centre gangway are in turn connected to form the oil flow channel of said oil pump.

5. compressor as claimed in claim 4; It is characterized in that; The inwall of said lower bearing component comprise successively from top to bottom in the first portion that is used to support said bent axle perimembranous, internal diameter less than perimembranous and internal diameter in the second portion of perimembranous in the said first portion greater than perimembranous in the third part of perimembranous in the said first portion; Wherein, Said oily suction chamber is formed between the outer surface in the stage casing of perimembranous and said impeller assembly in the said second portion, and the oil-in of said oil pump is radially run through perimembranous in the said second portion and formed from the outer wall of said lower bearing component.

6. compressor as claimed in claim 5 is characterized in that, further the outer wall from said lower bearing component radially runs through perimembranous formation vent in the said second portion, and said pressure-equalizing pipe is communicated with said oily suction chamber fluid via said vent.

7. compressor as claimed in claim 6; It is characterized in that; Said pressure-equalizing pipe is

shape; The end of the lateral part of said

shape inserts in the said vent, and the end of the vertical part of said

shape extends on the horizontal plane of the oil in the said food tray.

8. compressor as claimed in claim 6 is characterized in that, said oily discharge side is formed between the outer surface of interior perimembranous of said third part and said impeller.

9. compressor as claimed in claim 1 is characterized in that said pressure-equalizing pipe is arranged in the inside of said oil pump and said bent axle.

10. compressor as claimed in claim 9 is characterized in that, said compressor also comprises:

Impeller assembly; It comprises and is used for being connected so that epimere, the hypomere that is used to form impeller and the stage casing between epimere and hypomere of one rotation with the said underpart of said bent axle; The middle body indent of the bottom surface of said impeller forms said oily suction chamber; When said impeller assembly was assembled in the said pump case, the space between the interior perimeter surface of the outer surface of said impeller and said pump case formed said oily discharge side; And

Pump cover, it is assemblied in the said pump case and is positioned at said impeller below, and said oil-in is formed by the central openings of said pump cover.

11. compressor as claimed in claim 10 is characterized in that, the surface of said pump cover one side of the vicinity of said impeller is provided with at least one guiding gutter; Space between the interior perimeter surface of the outer surface in the stage casing of said impeller assembly and said pump case forms the static pressure passage; The epimere of said impeller assembly vertically runs through the said oil export of formation; Wherein, said oily suction chamber, said guiding gutter, said oily discharge side, said static pressure passage, said oil export are in turn connected to form the oil flow channel of said oil pump.

12. compressor as claimed in claim 11; It is characterized in that; The inwall of said lower bearing component comprise successively from top to bottom in the first portion that is used to support said bent axle perimembranous, internal diameter less than perimembranous, internal diameter in the second portion of perimembranous in the said first portion greater than perimembranous and internal diameter in the third part of perimembranous in the said first portion greater than perimembranous in the 4th part of perimembranous in the said third part; Wherein, Said static pressure tunnel-shaped is formed in the said second portion between the outer surface of perimembranous and the stage casing of said impeller assembly in the perimembranous and third part, and said oily discharge side is formed between the outer surface of interior perimembranous of said the 4th part and said impeller.

13. compressor as claimed in claim 12 is characterized in that, vertically runs through said impeller assembly and forms the centre gangway that is communicated with said oily suction chamber fluid, the lower end of said pressure-equalizing pipe is plugged in the said centre gangway.

14. compressor as claimed in claim 13 is characterized in that, the said oil export in the epimere of the said impeller assembly that is communicated with said oil supply gallery fluid said impeller assembly radially on be positioned at the outside of said centre gangway.

15. compressor as claimed in claim 14; It is characterized in that; Further the said lower end at said bent axle forms vent; Said vent is arranged at the opening on the said bent axle outer wall on the horizontal plane of oil of said food tray, and the upper end of said pressure-equalizing pipe is passed said oil supply gallery and is plugged in the part of said vent.

16. compressor as claimed in claim 15; It is characterized in that said pressure-equalizing pipe is

shape.

17. compressor as claimed in claim 1 is characterized in that, said oil pump is centrifugal pump, axial-flow pump or displacement pump.

18. like each described compressor among the claim 1-17, it is characterized in that, further comprise the foreign body filter that is provided with around the periphery of said oil pump.