CN1127541A - Centrifugal oil pump for a variable speed hermetic compressor - Google Patents
Centrifugal oil pump for a variable speed hermetic compressor Download PDFInfo
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- CN1127541A CN1127541A CN 94192881 CN94192881A CN1127541A CN 1127541 A CN1127541 A CN 1127541A CN 94192881 CN94192881 CN 94192881 CN 94192881 A CN94192881 A CN 94192881A CN 1127541 A CN1127541 A CN 1127541A
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- eccentric shaft
- oil pump
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Abstract
A centrifugal oil pump is used for a shift-gear sealed compressor which is provided with a sealed shell. A cylinder is arranged in the eccentric oil pumpthe shell, and the cylinder supports an eccentric main shaft that has is arranged with a rotor of an electric motor. The eccentric shaft is provided with at least an oil loop comprising which has a lower end leading to the eccentric shaft. The underside of the combined components of the eccentric shaft and the rotor inside the cylinder is provided with an upper stretched part of the oil pump rotor and a pipe casing; wherein the pipe casing is arranged inside the compressor and is around surrounds the outside part of the rotor on above the oil pump rotor and outside the rotor. The oil pump rotor has a centrifugal block extending along the diameter direction.
Description
The present invention relates to a kind of oil pump that is used for reciprocating type speed change closed compressor, especially for the oil pump of the king post system compressor of refrigerator and refrigerating machine.
Its corresponding closed compressor of these matching requirements has refrigerating capacity accurately, heat in being enough to get rid of from refrigerant.Because refrigerating capacity is directly proportional with flow by the refrigerant of compressor pump, the variation of refrigerating capacity means the changes in flow rate by compressor institute pumpable material.This technology of successively obtaining the mass flow-rate variation is to obtain by the rotating speed that changes motor.
Studies show that, variable speed compressor require 15Hz to 100Hz in other words 900 to 6000rpm operating range to obtain good refrigeration performance.The variation of this speed can influence the mechanical movement of compressor, particularly influences the operation of oil pump, and here, the task of oil pump is lubricating oil pump delivered in the part that the bearing of compressed machinery and other lubricate as requirement such as connecting rod and pistons and goes.
Centrifugal pump is the most frequently used lubricating oil pumping machine of closed-type compressor, and this is not only because its price is lower, also be enough to move under 3000 to 3600rpm rotating speed owing to it, and this rotating speed depends on the frequency of electrical network.Yet this machinery but can't move under low speed.
Common centrifugal oil pump, the oil pump that is using at present as shown in Figure 1 is when compressor requires just lubricating oil pump to be delivered in the bearing when working under low speed to go.
The operation limit of centrifugal pump is relevant with difference (r) with its big minor radius (R), and this can find out from following equation that this equation is determining centrifugal pump performance:
ω=((2gh)/(R
2-r
2))
1/2Wherein: h is the pumping height that requires from the pasta to the bearing; G is a universal gravitational constant; R be pump than long radius; R is a small radii; ω is angular velocity (rd/sec).
Only be difficult to realize by the efficient that improves oil pump than long radius (R) that increases pump, because, increased radius (R) is absolutely necessary concerning finishing required pumping work really,, also have influence on simultaneously the external diameter of compressor shaft at this, thereby also influencing the manufacturing process and the performance thereof of whole compressor, this is owing to can strengthen frictional loss like this.Should see that deficient change less on the diameter is to be issued to the desired degree of centrifugal pumping at the rotating speed that is near or below 900rpm.
The Ordinary Centrifugal Pumps with vertical shaft or horizontal axis of extensive use can be consulted patent US4 in closed-type compressor, and 478,559, US4,569,639, DT209,877 and FR2,492,471.But above-mentioned centrifugal pump can not be worked under the rotating speed that is lower than about 900rpm or working efficiency is very low.
In another kind of solution, belong to same claimant and as described on the docket the patent application, improving pumping efficiency is to obtain by an oil hydraulic-pump rotor with upstream screw groove as one, groove is along the appearance setting of a described rotor longitudinal extension body.Though this way has embodied lubricated efficient under general oil pump is low rotating speed (600rpm), the effect of its pumping is to obtain by along the helical groove of oil hydraulic-pump rotor lubricating oil being done mechanical drainage.
Like this, one object of the present invention is to provide a kind of oil pump that is used for reciprocating type main shaft speed change closed compressor, and its pump-conveying property 1 is the performance of rotating speed under about 600rpm, and is suitable with the oil pump of doing mechanical drainage.
Second purpose of the present invention is to provide more than one described oil pumps, improves its pumping capacity under the condition of structure that does not change cylinder member and size.
The 3rd purpose of the present invention is to provide a kind of simple oil pump of making and assemble.
The 4th purpose of the present invention is to provide a kind of oil pump that can not produce the lubricating oil eddy current in the oil groove of compressor, and this eddy current is created in some common oil pump.
Purpose of these and other and advantage are to obtain from the oil pump that adopts a kind of speed change closed compressor of the present invention, this oil pump has a closed shell, housing constitutes an oil groove in its bottom, a cylinder body is equipped with in portion within it, cylinder body supports an eccentric main axis, adorn the rotor of an electric motor on the main shaft, eccentric shaft has at least one oil circuit, oil circuit has the upper end that upper section outside, eccentric shaft stage casing is led in a lower end and of leading to the eccentric shaft lower end, in cylinder body, the assembly parts of eccentric shaft and rotor is equipped with the top extending body and a pipe box of an oil hydraulic-pump rotor in its underpart, pipe box is contained in the inside of compressor, and on described oil hydraulic-pump rotor, be positioned at part beyond the rotor at least, has a centrifugal district on the extending body of described oil hydraulic-pump rotor beyond it is positioned at rotor, radially extend and exceed the edge of eccentric shaft lower end in centrifugal district, and has a lower ending opening, this opening is immersed in the oil groove all the time, and make fluid communication with at least one top radial opening all the time, this opening is communicated with at least one Oil Guide axial passageway, this path is to constitute between a corresponding fan-shaped section on the outer surface of part beyond the above rotor of oil hydraulic-pump rotor and the adjacent pipe box inner wall section, described axial passageway is communicated with the lower end of oil circuit by at least one drainage channel, and this drainage channel is that the top extending body that vertically passes oil hydraulic-pump rotor is provided with.
The advantage of above-mentioned oil pump is the influence of machine actual size by compression not, and in this oil pump, minimum rotating speed (60rpm) can be obtained by regulating the oil hydraulic-pump rotor diameter at an easy rate.Oil pump also can use under the rotating speed of 6000rpm and not damage its operation being higher than, and also can use it for the compressor of installing by conventional method, and just motor is contained in the bottom of body.
Now just the present invention is as follows with reference to description of drawings, in the accompanying drawing:
Fig. 1 illustrates the radially sectional arrangement drawing that belongs to the prior art oil pump, is contained in the closed compressor, is shown with size h
1, h
2, R and r;
Fig. 2 a and 2b illustrate the oil pump that belongs to prior art following at a normal angular velocity (2a) to zoomed-in view when the angular velocity (2b) that reduces descend pumping lubricating oil respectively;
Fig. 3 illustrates the closed compressor inside that has oil pump of the present invention with a longitudinal view;
Fig. 4 is the amplification drawing in side sectional elevation of oil pump of the present invention.
Shown in above each figure, one main shaft speed change closed compressor has a closed shell 1, constitute an oil groove 2 in its bottom, a cylinder body 3 is equipped with in portion within it, cylinder body has a bearing 4 in order to support an eccentric main axis 5, axle 5 has a upper end 5a, an one lower end 5b and an electric motor 6, motor has one and is contained in stator 7 and on the cylinder body 3 and is contained in rotor 8 on the eccentric shaft 5, rotor is contained in eccentric shaft 5 and is positioned on the section below the bearing 4, constitute the assembly parts of an eccentric shaft and rotor, described eccentric shaft 5 has an oil circuit 9 at least, oil circuit has a lower end 9b and who leads to eccentric shaft 5 lower end 5b leads to upper section outside, eccentric shaft 5 stage casing on the section of bearing 4 upper end 9a, described eccentric shaft 5 connects at the upper end 10a of its a lower end 5b and a centrifugal pump rotor 10, and this rotor lower ending opening 10b is immersed in the lubricating oil in the oil groove 2.
In the compressor shown in Fig. 2 a and the 2b, bearing and other members lubricated is that the centrifugal action during by the assembly parts rotation of eccentric shaft and rotor is finished, and under the proper functioning of compressor, rotational speed is about 3000-3600rpm.
But, under the low speed rotation that generally is lower than 2000rpm, the lubricated threshold state that is in of member, even unlubricated at all sometimes, this is owing to no longer arrive the upper reaches 9a of described oil circuit 9 by the formed oil column of centrifugal action in oil circuit 9.
In this compressor, the efficient of oil pump be its be immersed in the groove 2 than minor diameter (radius r) and its function than proportionate relationship between the major diameter (radius R), described two the value approaching more, the sae number of described oil pump is low more, this mentions at the very start at this report.
By the present invention, adopting centrifugal pump to improve pumping capacity is to obtain than the difference between the long radius R by strengthening described small radii r and, radius r is related to the aperture that makes lubricating oil enter oil hydraulic-pump rotor 10 set lower ending opening 10b, and radius R relates to the maximum spacing of oil pump from geometrical axis.Relatively long radius R depends on the length of a radial passage 11 that should be provided with at least, the lower ending opening 10b quadrature that this path is best and lubricating oil enters the mouth, and the oil district of getting that makes the lubricating oil and of taking from oil groove 2 below will give explanation by described lower ending opening 10b is linked up mutually.
In another possible structure, described radial passage 11 is from the oblique top of lower ending opening 10b of oil hydraulic-pump rotor 10.
As described in the PI9201761, oil hydraulic-pump rotor of the present invention has a tipping that forms a clipping tubular head with a top 12 and a pipe box 20.Tipping prevents relative movement between the assembly parts of oil hydraulic-pump rotor 10 and eccentric shaft and rotor with head 12, this be by the sidewall of described head 12 to obtaining at the formed axial cavity inwall institute applied pressure of eccentric shaft 5 lower end 5b, or sidewall does not extend at eccentric shaft 5 and under the situation of rotor 8 lower end surfaces the formed axial cavity inwall institute applied pressure in rotor 8 axial center hole bottoms is obtained thus.
By the present invention, described head 12 is connecting a circumferential annular groove 13 concentric with described oil hydraulic-pump rotor 10 geometrical axis in its lower end, this groove and adjacent pipe box 20 inwalls constitute an oil ring, and the lubricating oil that pumping comes from oil groove 2 constantly is deposited on this groove and goes so that be sent in the oil circuit 9.
Fluid communication between described peripheral groove 13 and oil circuit 9 is to obtain by a L shaped drainage channel 14 in head 12 inside, and like this, its short radially extension is connected to the extension with a central shaft, in order to promote lubricating oil.Described drainage channel 14 has the oil-feed lower end 14b that a fuel-displaced upper end 14a and who leads to eccentric shaft 5 oil circuit inside leads to peripheral groove 13, this oil-feed lower end is connected with the oil circuit that will give explanation below, is retaining from oil groove 2 centrifugal pump and send here and it is guided no power waste ground the lubricating oil of oil circuit 9 in this oil circuit.
In another possible structural type, peripheral groove 13 is arranged at head 12 peripheries goes up on the fan-shaped section at 14b place, drainage channel 14 lower end.In above arbitrary solution, described peripheral groove 13 can arbitrarily be provided with until the situation lower edge one upwardly extending spirality circuit that is connected with the lower end 14b of described drainage channel 14 at the outer wall around described head 12, and this circuit does not exceed the lower end of eccentric shaft.Like this, for lubricating oil is carried out drainage, described spiral groove should be located on head 12 and the position that pipe box 20 inwalls contact, occupies the arc extension on described head 12 perisporiums, depends on required oil mass of guiding oil circuit 9 into.
Although not shown, in another organization plan, drainage channel 14 can become at least one pod on the outer surface that extends up to oil hydraulic-pump rotor 10 upper end 10a from peripheral groove 13.Another alternative organization plan has the head 12 with some drainage channels 14, and path vertically passes the inside of described head, and forms a branch of upwards path of divergence.In an alternative organization plan again, head 12 keeps fluid communication in conjunction with adopting a plurality of drainage channels and a plurality of appearance groove between peripheral groove 13 and oil circuit 9.
Oil hydraulic-pump rotor 10 also has a centrifugal bottom, this bottom has a centrifugal bottom 15, it is oblate that the bottom preferably is, the heart therein, the surface upwards is provided with head 12 from it, and is downward from its lower surface, with the head centering one pumping pipeline 16 is set, this pipeline is a tubular conduit, is immersed in all the time in the oil groove 2, guides lubricating oil into radial passage 11 by this pipeline.Described pipeline 16 has a upper opening 16a, and the lower openings 10b of oil hydraulic-pump rotor 10 is communicated with radial passage 11.Described radial passage 11 has an outer end 11b, and the lower edge of this end and rounded bottom 15 is separated by a distance, thereby constitutes a distribution oil ring road 17 mutually with pipe box 20, is constantly retaining the lubricating oil of sending here from oil groove 2 centrifugal pumps here.
Be positioned at eccentric shaft 5 part in addition on the lubricating oil rotor 10 and be with pipe box 20, this pipe box is fixed on certain part of compressor, for example is fixed on its housing, and it can not be rotated with described oil hydraulic-pump rotor 10.This fixing can described in PI9201761, carrying out.In the embodiment shown, do described fixing by a fixed arm 50, this arm is fixed on the inside of compressor again, for example is fixed on its housing 1.
Described pipe box 20 has a upper opening 20a, and upper opening is facing to the lower end 5b of eccentric shaft 5, has the diameter that the lower end 9b with oil circuit 9 matches, and is communicated with a bottom opening 20b, and the slightly larger in diameter of lower openings is in the diameter of oil hydraulic-pump rotor 10 respective base 15.Described lower openings 20b is facing to oil groove 2, and with its end limit all the time with described oil groove 2 in lubricating oil separated by a distance.Pipe box 20 keeps a determining deviation with oil hydraulic-pump rotor 10 all the time, thereby and form the little radial clearance of trying one's best between the rotor, rotating so that stop the drainage work of lubricating oil for preventing described pipe box 20 with the assembly parts of eccentric shaft and rotor, described gap is necessary.
Patent document is described as mentioned above, groove is made further spiral extension on this section if be not fixed on the head 12 that section in the described axial cavity has peripheral groove, like this, though not shown among the figure, the upper end 20a of pipe box 20 can insert in the axial cavity.
The edge of described pipe box 20 upper opening 20a and eccentric shaft 5 small distance of being separated by presents the skim lubricant film therebetween thereby make, and oil film prevents the contact wear between the described parts when the assembly parts rotation of eccentric shaft and rotor.
In this structural type, the lower openings 20b of pipe box 20 forms a peripheral skirt body on the part in the body of described sleeve pipe 20, and its wall is parallel to the wall of eccentric shaft 5 lower end 5b, and this skirt body constitutes the outer wall of described distribution oil ring shape path 17.From certain part of described annular channels 17, preferably longitudinally extending the rising path 18 of a lubricating fluid with respect to described peripheral skirt body, this path makes the lubricating oil of sending here by radial passage 11 centrifugal pumps lead to the filler opening 14b of head 12 drainage channels 14.This rising path is made of a groove of pipe box 20 inwalls, and the recess width diameter with path 11 at least is suitable, in order to avoid produce the saturation state of lubricating oil annular channels 16, thus make lubricating oil return oil groove 2, reduce pump speed efficient.
In lubricating oil pumping work, oil hydraulic-pump rotor 10 from oil groove 2 with the lubricating oil centrifugal pumping in path 11, here, because radius R increases, described lubricating oil leads to oil circuit 17 and energy is increased, and remains to the upper end 10a that described lubricating oil arrives oil hydraulic-pump rotor 10 with there is no obvious consume, leads to oil circuit 9 again.
Claims (8)
1. centrifugal oil pump, be used for the speed change closed compressor, this compressor has a closed shell (1), constitute an oil groove (2) in its bottom, a cylinder body (3) is equipped with in portion within it, cylinder body supports an eccentric vertical shaft (5), adorn the rotor (8) of an electric motor (6) on the vertical shaft, eccentric shaft (5) has at least one oil circuit (9), oil circuit has the upper end (9a) that upper section outside, eccentric shaft (5) stage casing is led in a lower end (9b) and of leading to eccentric shaft (5) lower end (5b), in cylinder body, the assembly parts of eccentric shaft and rotor is equipped with the top extending body (12) and a pipe box (20) of an oil hydraulic-pump rotor (10) in its underpart, pipe box is contained in the inside of compressor, and on described oil hydraulic-pump rotor (10), be positioned at rotor (8) part in addition at least, the feature of oil pump is: described oil hydraulic-pump rotor (4) is positioned at it and has a centrifugal district (15) on rotor (8) extending body in addition, radially extend and exceed the edge of eccentric shaft (5) lower end (5b) in centrifugal district, and has a lower ending opening (10b), this opening is immersed in the oil groove (2) all the time, and make fluid communication with at least one top radial opening (11b) all the time, this opening is communicated with at least one Oil Guide axial passageway (18), this path is to constitute between a corresponding fan-shaped section on the outer surface of part and adjacent pipe box (20) inner wall section in addition at the above rotor of oil hydraulic-pump rotor (10) (8), described Oil Guide axial passageway is communicated with the lower end of oil circuit (9) by at least one drainage channel (14), and this drainage channel is that the top extending body (12) that vertically passes oil hydraulic-pump rotor (10) is provided with.
2. by the described oil pump of claim 1, it is characterized in that: Oil Guide axial passageway (18) is made of the groove on the corresponding adjacent inner wall part of pipe box (20).
3. by the described oil pump of claim 1, it is characterized in that: Oil Guide axial passageway (18) is communicated with a distribution oil ring road (17), and loop constitutes between oil hydraulic-pump rotor (10) inside and pipe box (20), and described loop (17) is made fluid communication with top radial opening (11b).
4. by the described oil pump of claim 2, it is characterized in that: centrifugal district is made of an oblate bottom (15), and the bottom has last following peripheral, and portion is provided with a radial passage (11) at least within it, and this path is communicated with lower ending opening (10b) and top radial opening (11b).
5. by the described oil pump of claim 3, it is characterized in that: each radial passage and eccentric shaft (5) quadrature.
6. by the described oil pump of claim 1, it is characterized in that: each Oil Guide axial passageway (18) is communicated with oil circuit (9) by at least one drainage channel (14), and drainage channel vertically is arranged on the inside on oil hydraulic-pump rotor (10) top.
7. by the described oil pump of claim 6, it is characterized in that: drainage channel (14) is one to be located at the axial centre part in the described oil hydraulic-pump rotor (10), and oil circuit (9) is led in its upper end (14c), its at least one radially lower end (14b) lead to Oil Guide axial passageway (18).
8. by the described oil pump of claim 7, it is characterized in that: an annular oil circuit (13) is led in each lower end (14b) of drainage channel (14), and this oil circuit is positioned at beyond rotor (8) lower edge on oil hydraulic-pump rotor (10) and the body portion upper edge that the edge is adjacent therewith periphery is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94192881 CN1086447C (en) | 1994-04-04 | 1994-04-04 | Centrifugal oil pump for a variable speed hermetic compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94192881 CN1086447C (en) | 1994-04-04 | 1994-04-04 | Centrifugal oil pump for a variable speed hermetic compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1127541A true CN1127541A (en) | 1996-07-24 |
| CN1086447C CN1086447C (en) | 2002-06-19 |
Family
ID=5039553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94192881 Expired - Fee Related CN1086447C (en) | 1994-04-04 | 1994-04-04 | Centrifugal oil pump for a variable speed hermetic compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1086447C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734130A (en) * | 2011-03-31 | 2012-10-17 | 艾默生环境优化技术有限公司 | Compressor |
| CN103216610A (en) * | 2012-01-18 | 2013-07-24 | 通用汽车环球科技运作有限责任公司 | Lubrication system for planetary gear set |
| CN105041619A (en) * | 2015-06-26 | 2015-11-11 | 广州万宝集团压缩机有限公司 | Oil pumping structure for outer rotor refrigerating compressor |
| US11125233B2 (en) | 2019-03-26 | 2021-09-21 | Emerson Climate Technologies, Inc. | Compressor having oil allocation member |
| US11680568B2 (en) | 2018-09-28 | 2023-06-20 | Emerson Climate Technologies, Inc. | Compressor oil management system |
-
1994
- 1994-04-04 CN CN 94192881 patent/CN1086447C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734130A (en) * | 2011-03-31 | 2012-10-17 | 艾默生环境优化技术有限公司 | Compressor |
| CN103216610A (en) * | 2012-01-18 | 2013-07-24 | 通用汽车环球科技运作有限责任公司 | Lubrication system for planetary gear set |
| CN105041619A (en) * | 2015-06-26 | 2015-11-11 | 广州万宝集团压缩机有限公司 | Oil pumping structure for outer rotor refrigerating compressor |
| US11680568B2 (en) | 2018-09-28 | 2023-06-20 | Emerson Climate Technologies, Inc. | Compressor oil management system |
| US11125233B2 (en) | 2019-03-26 | 2021-09-21 | Emerson Climate Technologies, Inc. | Compressor having oil allocation member |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1086447C (en) | 2002-06-19 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Granted publication date: 20020619 |