CN204312336U

CN204312336U - Low backpressure rotary compressor

Info

Publication number: CN204312336U
Application number: CN201420770772.9U
Authority: CN
Inventors: 郭小龙; 高斌
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Midea Toshiba Compressor Corp; Guangdong Meizhi Compressor Co Ltd
Priority date: 2014-12-09
Filing date: 2014-12-09
Publication date: 2015-05-06
Anticipated expiration: 2024-12-09

Abstract

The utility model discloses a kind of low backpressure rotary compressor, comprising: housing, motor, compressing mechanism, bent axle, auxiliary bearing, oil separating device and sucking pipe.The upper end being enclosed within bent axle outside auxiliary bearing, to support bent axle, is provided with oil groove between auxiliary bearing and the periphery wall of bent axle.Oil separating device to be located in housing and to be positioned at the top of auxiliary bearing, and the upper end of bent axle extend in oil separating device, and oil separating device has air outlet, oil outlet and suction port, and suction port is communicated with muffler, and oil outlet is communicated with oil groove.Sucking pipe is positioned at outside housing, and the two ends of sucking pipe are communicated with compression chamber with air outlet respectively.According to low backpressure rotary compressor of the present utility model, ensure that the top of bent axle has enough lubricant oil to lubricate, reduce the wearing and tearing between bent axle and auxiliary bearing, extend the life-span of low backpressure rotary compressor.Because sucking pipe is located at outside housing, the impact that the flow perturbation effectively preventing enclosure interior rotor turns from producing sucks refrigerant.

Description

Low backpressure rotary compressor

Technical field

The utility model relates to refrigerating field, especially relates to a kind of low backpressure rotary compressor.

Background technique

Low back pressure huge discharge compressor, original cantilever beam structure cannot meet normal use, and winding degree is large at high speeds easily to cause bent axle, and show that rotor collides, bent axle and main bearing sinter problems such as losing efficacy.

Existing solution increases auxiliary bearing at the top of stator, but because auxiliary bearing is away from bottom oil sump, oil will be supplied to the height at auxiliary bearing place by the original oil supply structure of compressing mechanism, must be through hole by crankshaft center machining of oil hole, not only increase manufacture cost, and when frequency-changeable compressor runs high frequency on oil mass too much, cause stator head room to occur accumulating in a large number the problem of refrigerator oil, what worsen compressor tells oil mass.

When startup or long-term low-frequency operation, the pressure reduction in two spaces up and down separated by stator in housing is very little, oil in oil sump cannot be supplied to auxiliary bearing place by crankshaft oil hole, can aggravate the wearing and tearing of auxiliary bearing and bent axle upper end portion thus, reduces the life-span of compressor.

Model utility content

The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the utility model proposes a kind of low backpressure rotary compressor, ensure that the top of bent axle has enough lubricant oil to lubricate.

According to low backpressure rotary compressor of the present utility model, comprising: housing, the top of described housing is provided with muffler; Motor, described motor comprises stators and rotators, is enclosed within described rotor outside described stator, and described stator is fixed on the inwall of described housing; Compressing mechanism, described compressing mechanism to be located in described housing and to be positioned at the below of described motor, and described compressing mechanism comprises the cylinder with compression chamber; Bent axle, be enclosed within to drive described crank rotation on described bent axle outside described rotor, the upper end of described bent axle is stretched out from described rotor, and described compressing mechanism is stretched in the lower end of described bent axle, and described bent axle has the center oilhole running through described bent axle in the axial direction; Auxiliary bearing, is enclosed within the upper end of described bent axle to support described bent axle outside described auxiliary bearing, on the inwall that described auxiliary bearing is fixed on described housing or described stator, be provided with oil groove between the periphery wall of described auxiliary bearing and described bent axle; There is the oil separating device of Oil-gas Separation effect, described oil separating device to be located in described housing and to be positioned at the top of described auxiliary bearing, the upper end of described bent axle extend in described oil separating device, described oil separating device has air outlet, oil outlet and suction port, described suction port is communicated with described muffler, and described oil outlet is communicated with described oil groove; Sucking pipe, described sucking pipe is positioned at outside described housing, and the two ends of described sucking pipe are communicated with described compression chamber with described air outlet respectively.

According to low backpressure rotary compressor of the present utility model, by being provided with auxiliary bearing, can greatly reduce crank rotation particularly high speed rotating time disturbance to bent axle, reduce the wearing and tearing of bent axle, improve the life-span of bent axle 4.Simultaneously by being provided with oil separating device above auxiliary bearing, oil outlet is communicated with oil groove, thus can ensure no matter bent axle slowly runs or high speed rotating, the lubricant oil separated from the refrigerant that muffler enters can lubricate bent axle and auxiliary bearing, ensure that the top of bent axle has enough lubricant oil to lubricate, reduce the wearing and tearing between bent axle and auxiliary bearing, extend the life-span of low backpressure rotary compressor.Again because sucking pipe is located at outside housing, the impact that the flow perturbation that can effectively prevent enclosure interior rotor turns from producing sucks refrigerant.

According to embodiments more of the present utility model, described oil separating device comprises: oil separator, and described oil separator is positioned at the below of described muffler to carry out Oil-gas Separation to the refrigerant sucked from described muffler; Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, the upper end of described bent axle is covered on and the lower end of described oil return cover is fixed on described auxiliary bearing, the lubricant oil that the below that described oil return cover is positioned at described oil separator is separated for receiving described oil separator outside described oil return cover.

According to embodiments more of the present utility model, described oil separating device comprises: dividing plate, and described dividing plate is fixed on described housing or described auxiliary bearing, and described dividing plate has centre gangway; Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, covers on the upper end of described bent axle and the lower end of described oil return cover is fixed on described auxiliary bearing outside described oil return cover, and the upper end of described oil return cover is located on described dividing plate; Oil blocking cover, described oil blocking cover is formed as upper and lower sides and opens wide and the structure of hollow, the lower end of described oil blocking cover is fixed on described dividing plate, and described oil blocking cover is communicated with by described centre gangway with described oil return cover, and described muffler extend in described oil blocking cover from the sidewall of described oil blocking cover.

In concrete example of the present utility model, one end of described sucking pipe extend in described housing from the roof of described housing.

In concrete example of the present utility model, the upper end of described oil return cover extend in described centre gangway, and the periphery wall of the upper end of described oil return cover contacts with the inner circle wall of described centre gangway.

According to preferred exemplary of the present utility model, the length of the part that described muffler extend in described oil blocking cover is greater than the distance between the center line of the described oil blocking cover inwall relative with described oil blocking cover and described muffler.

According to embodiments more of the present utility model, described oil separating device comprises: the oil blocking cover of hollow, described oil blocking cover has upper end entrance and lower end outlet, described muffler extend in described oil blocking cover from described upper end entrance, the discharge area of described muffler is greater than the area of described lower end outlet, and described air outlet is located on the roof of described oil blocking cover; Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, cover on the upper end of described bent axle outside described oil return cover and the lower end of described oil return cover is fixed on described auxiliary bearing, upper end and the described lower end of described oil return cover export and are connected described oil blocking cover is communicated with described oil return cover.

Particularly, the roof of described oil blocking cover is provided with multiple through hole to limit described air outlet.

Alternatively, described oil blocking cover and described oil return cover are formed in one part.

In concrete example of the present utility model, reduce gradually after the cross-section area of described oil blocking cover first remains unchanged on direction from top to bottom.

According to embodiments more of the present utility model, described oil return is hood-shaped becomes solid of rotation, described oil return cover comprises vertical section, lower vertical section and is connected the intermediate section of described vertical section and described lower vertical section, and the cross-section area of described intermediate section increases gradually on direction from top to bottom.

Alternatively, the upper-end surface of described auxiliary bearing is provided with fixed groove, the lower end of described oil return cover and described fixed groove interference fit.

In further embodiment of the present utility model, low backpressure rotary compressor also comprises bent axle oil cap, described bent axle oil cap comprises department of assembly and oil retaining part, the lower end of described department of assembly extend in the oilhole of described center from the upper end of described center oilhole, the periphery wall of described department of assembly contacts with the inner circle wall of described center oilhole, described department of assembly is formed as hollow and bottom has the structure of oiler, described oil retaining part is connected with the upper end of described department of assembly, the cross-section area of described oil retaining part is greater than the cross-section area of described department of assembly, the top of described department of assembly is provided with the oilhole being communicated with described center oilhole and described oil separating device.

Preferably, the gross area s1 of described oilhole and the area s2 of described oiler meets following relation: 0.5≤s1/s2≤1.5.

Alternatively, described oilhole is two and radial symmetric setting.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the low backpressure rotary compressor according to the utility model embodiment;

Fig. 2 is the partial schematic diagram of the low backpressure rotary compressor shown in Fig. 1;

Fig. 3 is the schematic diagram of the oil return cover according to the utility model embodiment;

Fig. 4 is the schematic diagram of the bent axle oil cap according to the utility model embodiment;

Fig. 5 is the sectional drawing of the bent axle oil cap shown in Fig. 4;

Fig. 6 is the schematic diagram of the low backpressure rotary compressor according to another embodiment of the utility model;

Fig. 7 is the plan view of the low backpressure rotary compressor shown in Fig. 6;

Fig. 8 is the schematic diagram of the low backpressure rotary compressor according to another embodiment of the utility model;

Fig. 9 is the schematic diagram of the oil separating device in the low backpressure rotary compressor shown in Fig. 8;

Figure 10 is the plan view of the oil separating device shown in Fig. 9;

Figure 11 is the stereogram of the oil separating device shown in Fig. 9.

Reference character:

Low backpressure rotary compressor 100,

Housing 1, muffler 10, outlet pipe 11, upper shell 12, main casing 13, lower shell body 14,

Motor 2, stator 20, rotor 21,

Cylinder 30, main bearing 31, supplementary bearing 32, piston 33, cover plate 36,

Bent axle 4, center oilhole 40,

Auxiliary bearing 5, oil groove 50,

Oil separating device 6, oil separator 60, oil return cover 61, upper vertical section 610, intermediate section 611, lower vertical section 612, dividing plate 62, oil blocking cover 63, air outlet 64, oil outlet 65, upper end entrance 630,

Sucking pipe 7, bent axle oil cap 8, department of assembly 80, oiler 801, oilhole 802, oil retaining part 81.

Embodiment

Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.

In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.

In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.

The low backpressure rotary compressor 100 according to the utility model embodiment is described in detail below with reference to Fig. 1-Figure 11.Low backpressure rotary compressor 100 can also be able to be single cylinder compressor for duplex cylinder compressor.

As shown in Fig. 1, Fig. 6 and Fig. 8, according to the low backpressure rotary compressor 100 of the utility model embodiment, comprising: housing 1, motor 2, compressing mechanism, bent axle 4, auxiliary bearing 5, the oil separating device 6 with Oil-gas Separation effect and sucking pipe 7.Wherein, the top of housing 1 is provided with muffler 10, and housing 1 is also provided with outlet pipe 11.

Motor 2 comprises stator 20 and rotor 21, and be enclosed within rotor 21 outside stator 20, stator 20 is fixed on the inwall of housing 1.Compressing mechanism to be located in housing 1 and to be positioned at the below of motor 2, and compressing mechanism comprises the cylinder 30 with compression chamber.

Be understandable that, compressing mechanism also comprises the elements such as main bearing 31, supplementary bearing 32, piston 33 and slide plate, and when low backpressure rotary compressor 100 is single cylinder compressor, main bearing 31 and supplementary bearing 32 are located in the both ends of the surface of cylinder 30 respectively.When low backpressure rotary compressor 100 is duplex cylinder compressor, cylinder 30 is two, is provided with central diaphragm between two cylinders 30, and main bearing 31 and supplementary bearing 32 are located on the end face of two cylinders 30 respectively.

The eccentric part being enclosed within bent axle 4 outside piston 33 is positioned at the compression chamber of cylinder 30, and slide plate is reciprocally located in the vane slot of cylinder 30, and the head of slide plate contacts with the periphery wall of piston 33.Outlet pipe 11 is communicated with the exhaust cavity of compressing mechanism.

Be enclosed within outside rotor 21 on bent axle 4 and rotate with driving crank 4, the upper end of bent axle 4 is stretched out from rotor 21, and compressing mechanism is stretched in the lower end of bent axle 4, and bent axle 4 has the center oilhole 40 running through bent axle 4 in the axial direction.Bent axle 4 coordinates with supplementary bearing 32 through main bearing 31, cylinder 30.

Be enclosed within the upper end of bent axle 4 outside auxiliary bearing 5 to support bent axle 4, on the inwall that auxiliary bearing 5 is fixed on housing 1 or stator 20, thus main bearing 31, supplementary bearing 32 and auxiliary bearing 5 pairs of bent axles 4 form three places supports.Be provided with oil groove 50 between the periphery wall of auxiliary bearing 5 and bent axle 4, the inner circle wall that wherein oil groove 50 can be located at auxiliary bearing 5 also can be located on the periphery wall of bent axle 4.

Oil separating device 6 to be located in housing 1 and to be positioned at the top of auxiliary bearing 5, the upper end of bent axle 4 extend in oil separating device 6, oil separating device 6 has air outlet 64, oil outlet 65 and suction port, suction port is communicated with muffler 10, oil outlet 65 is communicated with oil groove 50, the refrigerant be drained in housing 1 from muffler 10 enters into oil separating device 6 by suction port and carries out Oil-gas Separation, and the lubricant oil separated is drained in oil groove 50 by oil outlet 65.

Sucking pipe 7 is positioned at outside housing 1, and the two ends of sucking pipe 7 are communicated with compression chamber with air outlet 64 respectively.The gaseous coolant separated from oil separating device 6 is drained into compression chamber by sucking pipe 7 and compresses, and the refrigerant after compression is discharged outside housing 1 by outlet pipe 11.

Be understandable that, the bottom of housing 1 is provided with the low pressure oil sump holding lubricant oil, and the center oilhole 40 of bent axle 4 is communicated with low pressure oil sump.

When bent axle 4 slowly runs, time particularly for compressor low speed start, as long as there is refrigerant to be sucked by muffler 10, oil separating device 6 will carry out Oil-gas Separation to this part refrigerant, liquid lubricant is separated, the lubricant oil separated enters in oil groove 50 by oil outlet 65, for lubricating upper end portion and the auxiliary bearing 5 of bent axle 4, reduces the wearing and tearing of bent axle 4.Along with the increase of bent axle 4 rotating speed, increased by the coolant quantity compressed, the coolant quantity sucked by muffler 10 is also increased thereupon, and the liquid lubricant therefore separated is also correspondingly more, can ensure that there is enough lubricant oil the upper end portion of bent axle 4 for lubrication.

When motor 2 high speed operation, the lubricant oil in low pressure oil sump can be drained in oil separating device 6 by center oilhole 40, and is drained in the oil groove 50 between bent axle 4 and auxiliary bearing 5 by oil outlet 65.

Simultaneously because bent axle 4 is provided with center oilhole 40, pressure difference is there is between the space on motor 2 top and the space of motor 2 bottom, lubricant oil in low pressure oil sump can be pressed in the center oilhole 40 of bent axle 4, and by the oil outlet structure on bent axle 4, lubricant oil is input between bent axle 4 and main bearing 31, between bent axle 4 and supplementary bearing 32, for lubricating bent axle 4 and main bearing 31, bent axle 4 and supplementary bearing 32.

According to the low backpressure rotary compressor 100 of the utility model embodiment, by being provided with auxiliary bearing 5, greatly can reducing the disturbance to bent axle 4 when bent axle 4 rotates particularly high speed rotating, reducing the wearing and tearing of bent axle 4, improve the life-span of bent axle 4.Simultaneously by being provided with oil separating device 6 above auxiliary bearing 5, oil outlet 65 is communicated with oil groove 50, thus can ensure no matter bent axle 4 slowly runs or high speed rotating, the lubricant oil separated from the refrigerant that muffler 10 enters can lubricate bent axle 4 and auxiliary bearing 5, ensure that the top of bent axle 4 has enough lubricant oil to lubricate, reduce the wearing and tearing between bent axle 4 and auxiliary bearing 5, extend the life-span of low backpressure rotary compressor 100.Again because sucking pipe 7 is located at outside housing 1, the impact that the flow perturbation that can effectively prevent housing 1 inner rotator 21 from rotating generation sucks refrigerant.

The low backpressure rotary compressor 100 according to the utility model first specific embodiment is described in detail below with reference to Fig. 1-5.

As shown in Figure 1, according to the low backpressure rotary compressor 100 of the utility model embodiment, comprising: housing 1, motor 2, compressing mechanism, bent axle 4, auxiliary bearing 5, the oil separating device 6 with Oil-gas Separation effect and sucking pipe 7.

Housing 1 comprises upper shell 12, main casing 13 and lower shell body 14, upper shell 12 is located at the upper end of main casing 13, lower shell body 14 is located at the lower end of main casing 13, upper shell 12, limit closed space between main casing 13 and lower shell body 14, wherein upper shell 12 and lower shell body 14 can adopt the mode of welding to be fixed on main casing 13.As shown in Figure 1, muffler 10 is located on upper shell 12, and outlet pipe 11 is located on main casing 13.

Compressing mechanism is located in housing 1, compressing mechanism comprises cylinder 30, piston 33, slide plate, main bearing 31, supplementary bearing 32 and cover plate 36, main bearing 31 is located at the upper-end surface of cylinder 30, supplementary bearing 32 is located at the lower end surface of cylinder 30, cylinder 30 has compression chamber and vane slot, is enclosed within bent axle 4 to play a supporting role to bent axle 4 outside main bearing 31 and supplementary bearing 32.The eccentric part being enclosed within bent axle 4 outside piston 33 is located in compression chamber with eccentric rotary, and slide plate is reciprocally located in vane slot, and the head of slide plate connects with the periphery wall of piston 33, and the afterbody of slide plate is connected with spring.On the lower end surface that cover plate 36 is located at supplementary bearing 32 with limit the exhaust cavity be communicated with outlet pipe 11 between supplementary bearing 32.

The bottom of housing 1 is provided with low pressure oil sump, is supplied in compressing mechanism by the lubricant oil in low pressure oil sump by the center oilhole 40 of bent axle 4.

Motor 2 is located in housing 1, and the vertical central axis for driving crank 4 flexing axle 4 rotates, and wherein the upper end portion of bent axle 4 upwards extends beyond motor 2.Motor 2 comprises stator 20 and rotor 21, and stator 20 is fixed on the inwall of housing 1, and rotor 21 is located in stator 20 rotationally, and rotor 21 is fixedly connected with the upper end of bent axle 4, rotor 21 can be driven to be with dynamic crankshaft 4 to rotate by stator 20.

Motor 2 is positioned at the top of main bearing 31, space in housing 1 is isolated into upper chamber and lower chamber by motor 2, upper chamber and lower chamber are by channel connection, passage can comprise the subchannel be formed between stator 20 outer circumferential face and housing 1 inner peripheral surface, passage can also comprise the through hole be formed on stator 20 or the through hole be formed on rotor 21, the part of identical or close design can be adopted with existing technology for these, launch explanation no longer in detail here.

Auxiliary bearing 5 is located at the top of motor 2 for supporting the upper end of bent axle 4, auxiliary bearing 5, main bearing 31 and supplementary bearing 32 pairs of bent axles 4 form three places and support, thus can greatly to reduce when bent axle 4 rotates particularly high speed rotating time to bent axle 4 disturbance, reduce the wearing and tearing of bent axle 4, improve the life-span of bent axle 4.Be provided with oil groove 50 in auxiliary bearing 5, oil groove 50 can be formed as helical oil groove 50.Auxiliary bearing 5 can be bolted on stator 20.

Muffler 10 can be arranged on the top of housing 1, and the lower end of muffler 10 extend in housing 1 and upper end is stretched out outside housing 1, and muffler 10 can be integrally welded with housing 1, and muffler 10 is inner for the low-temp low-pressure refrigerant outside housing 1 being input to housing 1.

Oil separating device 6 to be located in housing 1 and to be positioned at the anti-compression mechanical part side of motor 2, wherein, be understandable that, the inner space of housing 1 can be isolated into compression mechanical part side (namely above-mentioned lower space) and anti-compression mechanical part side (namely above-mentioned upper space) by motor 2, wherein compressing mechanism arranges the side, compressor means portion of drive motor 2, and anti-compression mechanical part side is the opposite side relative with compression mechanical part side.

Oil separating device 6 comprises: oil separator 60 and oil return cover 61, and oil separator 60 is positioned at the below of muffler 10 to carry out Oil-gas Separation to the refrigerant sucked from muffler 10.Oil return cover 61 is formed as upper and lower sides and opens wide and the structure of hollow, the upper end of bent axle 4 is covered on and the lower end of oil return cover 61 is fixed on auxiliary bearing 5, the lubricant oil that the below that oil return cover 61 is positioned at oil separator 60 is separated for receiving oil separator 60 outside oil return cover 61.Thus, suction port and air outlet 64 are located in oil separator 60, and the lower ending opening of oil return cover 61 limits oil outlet 65.

Oil separator 60 is to from muffler 10, the refrigerant entered in housing 1 carries out Oil-gas Separation, the lubricant oil separated from oil separator 60 enters in oil return cover 61 from the upper end of oil return cover 61, and oil return cover 61 is collected the lubricant oil separated and imported by lubricant oil in the oil groove 50 between auxiliary bearing 5 and bent axle 4.Wherein in order to realize the oily separating effect to the refrigerant that muffler 10 sucks, oil separator 60 can arrange multiple, and each oil separator 60 is all communicated with muffler 10, and each oil separator 60 is all connected with oil return cover 61 simultaneously.

Wherein as shown in Figure 3, oil return cover 61 is formed as solid of rotation, oil return cover 61 comprises vertical section 610, lower vertical section 612 and the intermediate section 611 being connected vertical section 610 and lower vertical section 612, the cross-section area of intermediate section 611 increases gradually on direction from top to bottom, and such as intermediate section 611 can be formed as inverted cone.Lower vertical section 612 is fixed on auxiliary bearing 5.Thus by making the cross-section area of intermediate section 611 increase gradually on direction from top to bottom, the lubricant oil that oil separator 60 can be realized to separate is fast to the local oil sump transfer that oil return cover 61 and auxiliary bearing 5 surround.Wherein, upper vertical section 610, intermediate section 611 and lower vertical section 612 can be formed in one part, also can be independent process component.

As depicted in figs. 1 and 2, the upper-end surface of auxiliary bearing 5 is provided with fixed groove, the lower end of oil return cover 61 and fixed groove interference fit.It is appreciated of course that the means of fixation of oil return cover 61 is not limited to interference fit, can also be adopt to be screwed.

When bent axle 4 slowly runs, time particularly for compressor low speed start, as long as there is refrigerant to be sucked by muffler 10, oil separator 60 will carry out Oil-gas Separation to this part refrigerant, gaseous coolant is drawn in compression chamber from sucking pipe 7, and liquid lubricant is separated, and isolated lubricant oil exports to upper end portion and the auxiliary bearing 5 of bent axle 4, for lubricating upper end portion and the auxiliary bearing 5 of bent axle 4, reduce the wearing and tearing of bent axle 4.Along with the increase of bent axle 4 rotating speed, increased by the coolant quantity compressed, the coolant quantity sucked by muffler 10 is also increased thereupon, therefore isolates liquid lubricant is also corresponding more.Thus can ensure that there is enough lubricant oil the upper end portion of bent axle 4 for lubrication.

In the process that bent axle 4 rotates, the lubricant oil of local oil sump can be brought to the bottom of auxiliary bearing 5 by oil groove 50, the passage through being communicated with upper chamber and lower chamber flow back in the low pressure oil sump bottom housing 1.

Upper end due to bent axle 4 extend in oil return cover 61, when low backpressure rotary compressor 100 low cruise, the lubricant oil of low pressure effectively can not be driven bent axle 4 upper end portion by bent axle 4 quick rotation, when the lubricant oil that oil separator 60 is separated flows down along oil return cover 61, there is the problem that lubricant oil enters the center oilhole 40 of bent axle 4, thus bent axle oil cap 8 can be provided with in bent axle 4 upper end portion, as shown in Fig. 1 Fig. 6 and Fig. 8.Thus in the normal fuel-displaced situation of the center oilhole 40 that can meet bent axle 4, effectively reduce the problem that lubricant oil that oil separating device 6 separates enters into the center oilhole 40 of bent axle 4, ensure that the lubricant oil separated from oil separator 60 all enters in the oil groove 50 between bent axle 4 and auxiliary bearing 5 along oil return cover 61, ensure the lubrication effect of upper end portion to bent axle 4 and auxiliary bearing 5.

As shown in Fig. 1 and Fig. 2, Fig. 4 and Fig. 5, bent axle oil cap 8 comprises department of assembly 80 and oil retaining part 81, the lower end of department of assembly 80 extend in center oilhole 40 from the upper end of center oilhole 40, the periphery wall of department of assembly 80 contacts with the inner circle wall of center oilhole 40, department of assembly 80 is formed as hollow and bottom has the structure of oiler 801, oil retaining part 81 is connected with the upper end of department of assembly 80, the cross-section area of oil retaining part 81 is greater than the cross-section area of department of assembly 80, and the top of department of assembly 80 is provided with the oilhole 802 of connection center oilhole 40 and oil separating device 6.Wherein, department of assembly 80 and oil retaining part 81 can be formed in one part.As shown in Figure 4 and Figure 5, oil retaining part 81 is formed as dull and stereotyped, and department of assembly 80 is formed as cylindrical body.

Specifically, the lubricant oil entered in oil return cover 61 can not be able to be entered in the center oilhole 40 of bent axle 4 by oil retaining part 81 backstop, and the lubricant oil in the center oilhole 40 of bent axle 4 can be entered in oil return cover 61 by oilhole 802.Wherein, the number of oilhole 802 can be arranged according to actual conditions.As shown in Figure 5, oilhole 802 is two and radial symmetric setting.

In order to better meet, bent axle 4 is fuel-displaced not to be affected by bent axle oil cap 8, and the gross area s1 of the oilhole 802 and area s2 of oiler 801 meets following relation: 0.5≤s1/s2≤1.5.Wherein the gross area s1 of oilhole 802 refers to when oilhole 802 is for time multiple, the summation of the area of multiple oilhole 802.

The low backpressure rotary compressor 100 according to the utility model second specific embodiment is described in detail below with reference to Fig. 6 and Fig. 7.

In this embodiment, with the set-up mode of above-described embodiment unlike the structure of, oil separating device 6, muffler 10 and sucking pipe 7, all the other structures are all same as described above, just repeat no more here.

As shown in Figure 6 and Figure 7, oil separating device 6 comprises: dividing plate 62, oil return cover 61 and oil blocking cover 63.Wherein, dividing plate 62 is fixed on auxiliary bearing 5, and dividing plate 62 has centre gangway, and dividing plate 62 is formed as hollow and the rotary structure of bottom-open, and centre gangway runs through the top board of dividing plate 62.Be understandable that, dividing plate 62 can also be formed as dull and stereotyped, and dividing plate 62 is fixed on housing 1, and in brief, dividing plate 62 can be fixed on housing 1 or auxiliary bearing 5, and the effect that dividing plate 62 plays is in order to fixing oil blocking cover 63.

Oil return cover 61 is formed as upper and lower sides and opens wide and the structure of hollow, the upper end of bent axle 4 is covered on and the lower end of oil return cover 61 is fixed on auxiliary bearing 5 outside oil return cover 61, the upper end of oil return cover 61 is located on dividing plate 62, as shown in Figure 6, the upper end of oil return cover 61 extend in centre gangway, and the periphery wall of the upper end of oil return cover 61 contacts with the inner circle wall of centre gangway.It is appreciated of course that the upper end of oil return cover 61 also can not extend in centre gangway, and the upper end of oil return cover 61 can be fixed on the lower surface of the top board of dividing plate 62.

Oil blocking cover 63 is formed as upper and lower sides and opens wide and the structure of hollow, and the lower end of oil blocking cover 63 is fixed on dividing plate 62, and oil blocking cover 63 is communicated with by centre gangway with oil return cover 61, and muffler 10 extend in oil blocking cover 63 from the sidewall of oil blocking cover 63.That is, muffler 10 is located on the sidewall of housing 1, and the tail end straight cutting of muffler 10 enters in oil blocking cover 63.Limited opening in the insertion oil blocking cover 63 of muffler 10 goes out suction port, and the upper end of oil blocking cover 63 limits air outlet 64, and the lower end of oil return cover 61 limits oil outlet 65.

Specifically, oil blocking cover 63 plays the effect of Oil-gas Separation, and the refrigerant of low-temp low-pressure enters in oil blocking cover 63 from muffler 10, and refrigerant impacts the inwall of oil blocking cover 63, impact makes refrigerant Oil-gas Separation, and the gaseous coolant separated is drawn in cylinder 30 by sucking pipe 7 and compresses.The lubricant oil separated enters in oil return cover 61, and the upper end portion being supplied to auxiliary bearing 5 and bent axle 4 from oil outlet 65 is to lubricate auxiliary bearing 5 and bent axle 4.

As shown in Figure 6, one end of sucking pipe 7 extend in housing 1 from the roof of housing 1, thus the gaseous coolant being convenient to flow out from oil blocking cover 63 enters in sucking pipe 7.

As shown in Figure 7, the length H of part that muffler 10 extend in oil blocking cover 63 is greater than the distance M between the center line of oil blocking cover 63 and the inwall of the relative with muffler 10 of oil blocking cover 63.That is, muffler 10 extends beyond the position at center line place in oil blocking cover 63, thus can improve the impact force of sidewall to refrigerant of oil blocking cover 63.

Need to be described, the shape of oil return cover 61 can be identical with the shape of the oil return cover 61 of above-described embodiment in this embodiment, is just not described in detail here.

The low backpressure rotary compressor 100 according to the utility model the 3rd specific embodiment is described in detail below with reference to 8-Figure 11.

As shown in Figure 8, in this embodiment, be from according to the low backpressure rotary compressor 100 of the utility model first specific embodiment is different: the structure of oil separating device 6, the setting of muffler 10, the structure of remaining part is identical with the structure of the low backpressure rotary compressor 100 according to the utility model first specific embodiment, just repeats no more here.

As shown in figures s-11, oil separating device 6 comprises: the oil blocking cover 63 of hollow and oil return cover 61.Oil blocking cover 63 has upper end entrance 630 and lower end outlet, and muffler 10 extend in oil blocking cover 63 from upper end entrance 630, and the discharge area of muffler 10 is greater than the area of lower end outlet, and air outlet 64 is located on the roof of oil blocking cover 63.

Oil return cover 61 is formed as upper and lower sides and opens wide and the structure of hollow, covers on the upper end of bent axle 4 and the lower end of oil return cover 61 is fixed on auxiliary bearing 5 outside oil return cover 61, and the top and bottom outlet of oil return cover 61 is connected to make oil blocking cover 63 be communicated with oil return cover 61.Wherein, oil blocking cover 63 and oil return cover 61 can be formed in one part.

Discharge area due to muffler 10 is greater than the area of lower end outlet, low-temp low-pressure refrigerant enters in oil blocking cover 63 from muffler 10, refrigerant impacts oil return cover 61 inwall, impact makes refrigerant Oil-gas Separation, the gaseous coolant separated is drawn in cylinder 30 by sucking pipe 7 and compresses, the lubricant oil separated flow in oil return cover 61, and the upper end portion being supplied to auxiliary bearing 5 and bent axle 4 from oil outlet 65 is to lubricate auxiliary bearing 5 and bent axle 4.

As shown in Figure 9 and Figure 10, the roof of oil blocking cover 63 is provided with multiple through hole to limit air outlet 64.Wherein multiple through hole can be divided into many groups, and the uniform intervals distribution in the circumference of bent axle 4 of many group through holes, often organizes through hole radially spaced apart.

As shown in figs, the cross-section area of oil blocking cover 63 reduces after first remaining unchanged on direction from top to bottom gradually.The shape of oil return cover 61 is identical with according to the shape of the oil return cover 61 described in the utility model first specific embodiment, just repeats no more here.

In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.

Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.

Claims

1. a low backpressure rotary compressor, is characterized in that, comprising:

Housing, the top of described housing is provided with muffler;

Motor, described motor comprises stators and rotators, is enclosed within described rotor outside described stator, and described stator is fixed on the inwall of described housing;

Compressing mechanism, described compressing mechanism to be located in described housing and to be positioned at the below of described motor, and described compressing mechanism comprises the cylinder with compression chamber;

Bent axle, be enclosed within to drive described crank rotation on described bent axle outside described rotor, the upper end of described bent axle is stretched out from described rotor, and described compressing mechanism is stretched in the lower end of described bent axle, and described bent axle has the center oilhole running through described bent axle in the axial direction;

Auxiliary bearing, is enclosed within the upper end of described bent axle to support described bent axle outside described auxiliary bearing, on the inwall that described auxiliary bearing is fixed on described housing or described stator, be provided with oil groove between the periphery wall of described auxiliary bearing and described bent axle;

There is the oil separating device of Oil-gas Separation effect, described oil separating device to be located in described housing and to be positioned at the top of described auxiliary bearing, the upper end of described bent axle extend in described oil separating device, described oil separating device has air outlet, oil outlet and suction port, described suction port is communicated with described muffler, and described oil outlet is communicated with described oil groove;

Sucking pipe, described sucking pipe is positioned at outside described housing, and the two ends of described sucking pipe are communicated with described compression chamber with described air outlet respectively.

2. low backpressure rotary compressor according to claim 1, is characterized in that, described oil separating device comprises:

Oil separator, described oil separator is positioned at the below of described muffler to carry out Oil-gas Separation to the refrigerant sucked from described muffler;

Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, the upper end of described bent axle is covered on and the lower end of described oil return cover is fixed on described auxiliary bearing, the lubricant oil that the below that described oil return cover is positioned at described oil separator is separated for receiving described oil separator outside described oil return cover.

3. low backpressure rotary compressor according to claim 1, is characterized in that, described oil separating device comprises:

Dividing plate, described dividing plate is fixed on described housing or described auxiliary bearing, and described dividing plate has centre gangway;

Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, covers on the upper end of described bent axle and the lower end of described oil return cover is fixed on described auxiliary bearing outside described oil return cover, and the upper end of described oil return cover is located on described dividing plate;

Oil blocking cover, described oil blocking cover is formed as upper and lower sides and opens wide and the structure of hollow, the lower end of described oil blocking cover is fixed on described dividing plate, and described oil blocking cover is communicated with by described centre gangway with described oil return cover, and described muffler extend in described oil blocking cover from the sidewall of described oil blocking cover.

4. low backpressure rotary compressor according to claim 3, is characterized in that, one end of described sucking pipe extend in described housing from the roof of described housing.

5. low backpressure rotary compressor according to claim 3, is characterized in that, the upper end of described oil return cover extend in described centre gangway, and the periphery wall of the upper end of described oil return cover contacts with the inner circle wall of described centre gangway.

6. low backpressure rotary compressor according to claim 3, it is characterized in that, the length of the part that described muffler extend in described oil blocking cover is greater than the distance between the center line of the described oil blocking cover inwall relative with described oil blocking cover and described muffler.

7. low backpressure rotary compressor according to claim 1, is characterized in that, described oil separating device comprises:

The oil blocking cover of hollow, described oil blocking cover has upper end entrance and lower end outlet, described muffler extend in described oil blocking cover from described upper end entrance, and the discharge area of described muffler is greater than the area of described lower end outlet, and described air outlet is located on the roof of described oil blocking cover;

Oil return cover, the hood-shaped upper and lower sides that becomes of described oil return opens wide and the structure of hollow, cover on the upper end of described bent axle outside described oil return cover and the lower end of described oil return cover is fixed on described auxiliary bearing, upper end and the described lower end of described oil return cover export and are connected described oil blocking cover is communicated with described oil return cover.

8. low backpressure rotary compressor according to claim 7, is characterized in that, the roof of described oil blocking cover is provided with multiple through hole to limit described air outlet.

9. low backpressure rotary compressor according to claim 7, is characterized in that, described oil blocking cover and described oil return cover are formed in one part.

10. low backpressure rotary compressor according to claim 7, is characterized in that, reduces gradually after the cross-section area of described oil blocking cover first remains unchanged on direction from top to bottom.

11. low backpressure rotary compressor according to any one of claim 2-10, it is characterized in that, described oil return is hood-shaped becomes solid of rotation, described oil return cover comprises vertical section, lower vertical section and is connected the intermediate section of described vertical section and described lower vertical section, and the cross-section area of described intermediate section increases gradually on direction from top to bottom.

12. low backpressure rotary compressor according to any one of claim 2-10, it is characterized in that, the upper-end surface of described auxiliary bearing is provided with fixed groove, the lower end of described oil return cover and described fixed groove interference fit.

13. low backpressure rotary compressor according to claim 1, it is characterized in that, also comprise bent axle oil cap, described bent axle oil cap comprises department of assembly and oil retaining part, the lower end of described department of assembly extend in the oilhole of described center from the upper end of described center oilhole, the periphery wall of described department of assembly contacts with the inner circle wall of described center oilhole, described department of assembly is formed as hollow and bottom has the structure of oiler, described oil retaining part is connected with the upper end of described department of assembly, the cross-section area of described oil retaining part is greater than the cross-section area of described department of assembly, the top of described department of assembly is provided with the oilhole being communicated with described center oilhole and described oil separating device.

14. low backpressure rotary compressor according to claim 13, is characterized in that, the gross area s1 of described oilhole and the area s2 of described oiler meets following relation: 0.5≤s1/s2≤1.5.

15. low backpressure rotary compressor according to claim 13, is characterized in that, described oilhole is two and radial symmetric is arranged.