CN1074092C - Mechanical oil pump for a variable speed hermetic compressor - Google Patents
Mechanical oil pump for a variable speed hermetic compressor Download PDFInfo
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- CN1074092C CN1074092C CN 94195098 CN94195098A CN1074092C CN 1074092 C CN1074092 C CN 1074092C CN 94195098 CN94195098 CN 94195098 CN 94195098 A CN94195098 A CN 94195098A CN 1074092 C CN1074092 C CN 1074092C
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- oil
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- towing
- pump rotor
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Abstract
The present invention relates to a mechanical oil pump for variable speed hermetic compressors, which comprises a hermetic shell (1), wherein the hermetic shell limits a lubrication groove (2) at the bottom, and a cylinder body (3) supporting an eccentric vertical shaft (5) is arranged in the hermetic shell. A rotor (8) of a motor (6) is arranged on the vertical shaft, and the vertical shaft is provided with a lower end (5b) and an upper end (5a). The lower part of a rotor assembly of the eccentric vertical shaft is connected with axial extension parts of the upper parts of pump rotors (10, 10'); the pump rotors are provided with at least one oil transportation path (12, 12') at least one part of which is limited along the axial extension parts, and pipe-shaped sleeves (20, 20') connected to the inertia part of a compressor; dragging oil cavities (21, 21') immersed into one part of a lubrication groove (2) around the pump rotors (10, 10') are limited in the pipe-shaped sleeves, and the dragging oil cavities are provided with at least one oil inlet (21a, 21a') communicated with the lubrication groove (2) and oil outlets (21b, 21b'). The ends of the pump rotors (10, 10') in the dragging oil cavities are provided with at least one dragging blade (14, 15) with ends which are always in contact with the inner walls of the dragging oil cavities (21, 21') in order that oil received through the oil inlets (21a, 21a') can be conveniently driven to the oil outlets (21b, 21b') of the dragging oil cavities (21, 21') with an angle in the radial direction.
Description
The present invention relates to the mechanical oil pump of variable speed hermetic compressor, particularly have vertical pivot, be used for the mechanical oil pump of the sort of variable speed hermetic compressor of small-type refrigeration appliance such as refrigerator and freezer.
The said equipment requires its hermetic compressor to provide from the medium of needs refrigeration and takes away the needed accurate refrigeration work consumption of internal heat.Because refrigeration work consumption is directly proportional with the refrigerant flow of compressor pump, thereby the variation of refrigeration work consumption means the changes in flow rate by compressor pump.Obtaining the technology of the above-mentioned variation of flow is continuously undertaken by changing motor speed.
There are some researches show that variable speed compressor needs 15Hz to 100Hz, i.e. 900 to 6000 rev/mins operating range is so that realize good refrigeration performance.Above-mentioned rotation speed change influences the operation of the mechanically actuated of compressor, particularly oil pump, and oil pump is responsible for oil is delivered to bearing and other zone that need lubricate such as the connecting rod and the piston of compressor.Centrifugal pump is a pump oil mechanism commonly used in the hermetic compressor, and this is that above-mentioned rotating speed is the result that the frequency of electrical network forms because its price is low and be suitable for working in 3600 rev/mins of rotating speeds 3000.But said mechanism but is unsuitable under the slow-speed of revolution and works.
Common centrifugal oil pump, present use as shown in Figure 1 the sort of can not be with oil pump to bearing when compressor needs low-speed running.
The work limitation of centrifugal oil pump is relevant with its difference than long radius (R) and small radii (r).
The efficient that increases oil pump than long radius (R) by increasing pump simply is infeasible, this is because will realize required pumping work, above-mentioned increase is crucial certainly, above-mentioned increase also can influence the external diameter of compressor shaft, therefore, can influence whole manufacturing process and its performance of compressor, can strengthen loss owing to friction.Obviously, near or less than 900 rev/mins rotating speed in, little vary in diameter is not enough to realize the centrifugal pumping of required degree.
As patent documentation US 4,478,559; US 4,569, and 639; DT 209,877 and FR 2,492,471 etc. are disclosed, widely used common centrifugal pump in hermetic compressor, and when pumping under low speed, it is not good to show performance.
In the applicant's the another kind of technological scheme described in the patent application that awaits the reply jointly, effective pump oil in about 60 rev/mins rotating speed, pump oil is to realize by the towing along screw channel set in the rotor of pump.
Therefore, the purpose of this invention is to provide a kind of propelling machinery formula oil pump that is used for reciprocating hermetic compressor, it has vertical pivot, need work under the rotating speed of wide range, also can promote to lubricate fully under low speed, and its pump oil flow is directly proportional with the rotating speed of axle.
Second purpose of the present invention provides a kind of above-mentioned oil pump, and its pumping power increases and the cylinder body part do not done structural change or changed its size.
The 3rd purpose of the present invention provides a kind of above-mentioned oil pump, and its manufacturing and assembling are simple.
The 4th purpose of the present invention provides a kind of oil pump, and it can not produce in the oil groove of compressor and resemble the sort of oily eddy current that some conventional seals compressor oil pump can occur.
Above-mentioned purpose and advantage with other are to realize by a kind of oil pump of variable speed hermetic compressor, it comprises: the mechanical oil pump of variable speed hermetic compressor, it comprises a capsul, described capsul defines an oil groove and wherein is equipped with in the bottom: the cylinder body of an eccentric vertical pivot of supporting, the rotor of a motor is contained on the eccentric vertical pivot, described eccentric vertical pivot is provided with at least one oil duct, its lower end passes to the lower end of eccentric vertical pivot, its upper end passes to the outside of going up the middle part of eccentric vertical pivot, eccentric vertical pivot-rotor assembly is connected in the upper axial extension part and a tubular sleeve of pump rotor in its underpart, described tubular sleeve is connected in an inertia part of compressor and around at least a portion that is immersed in the pump rotor in the oil, described oil pump is characterised in that it comprises:
-one towing oil pocket, it is interior so that the pump rotor of packing into is immersed in the part of part in the oil that it is limited to tubular sleeve, and have at least one filler opening that is communicated with oil groove and an oil outlet, and described pump rotor seals vertically somewhere with tubular sleeve and contacts;
-at least one pulls blade, and it has the end of a described end portion that is installed in pump rotor in the towing oil pocket and one and always contacts so that reach the opposed end that will be forced to the oil outlet that pulls oil pocket by the oil from oil groove that filler opening receives diametrically angledly with towing oil pocket inwall;
-at least one oil transportation road limits along at least a portion of the portion that extends axially of pump rotor, so that its lower end is communicated with the oil outlet fluid of towing oil pocket by a connection oil duct by the tubular sleeve carrying, and makes the lower end that passes to oil duct on it.
Above-mentioned oil pump reveals enough pumping capacities for about 300 rev/mins tachometer and does not damage its operation, also can be applied on the compressor of installing according to common mode, that is, motor is in the bottom of body.
Now contrast the following drawings and describe the present invention:
Fig. 1 represents the oil pump of prior art with longitudinal section, and it is installed in the hermetic compressor, is of a size of h
1, h
2, R and r.
Fig. 2 a and 2b are illustrated respectively in the zoomed-in view of normal angular velocity (2a) and the prior art oil pump in the following pump oil of the speed that reduces (2b) process.
Fig. 3 and 3a are respectively the amplification longitudinal sections of oil pump of the present invention and along the sectional view of III-III line among Fig. 3.
Fig. 4 is corresponding with Fig. 3 and 3a with 4a, the another kind of structure choice of expression oil pump of the present invention.
According to above-mentioned accompanying drawing, the variable speed hermetic compressor of vertical pivot comprises: a capsul 1, form an oil groove 2 in its bottom, in capsul, be equipped with: a cylinder body 3, it has the holistic bearing 4 that is used to support eccentric vertical pivot 5, vertical pivot is provided with upper end 5a and lower end 5b, and be provided with motor 6, motor 6 has the rotor 8 on stator 7 that is installed on cylinder body 3 and a part that is installed on eccentric vertical pivot 5, eccentric vertical pivot 5 extends downwards from bearing 4, form eccentric vertical pivot-rotor assembly, described eccentric vertical pivot 5 is provided with at least one oil duct 9, and this oil duct has lower end 9b and upper end 9a, lower end 9b passes to eccentric vertical pivot 5 lower end 5b, upper end 9a passes to the outside that eccentric vertical pivot 5 divides in the middle and upper part of bearing 4, and described eccentric vertical pivot 5 is equipped with the upper end 10a of pump rotor 10 at its lower end 5b, and the lower end 10b of pump rotor is immersed in the oil in the oil groove 2.
In the compressor shown in Fig. 2 a and the 2b, piston and the lubricated of other part are to finish by centrifugation in the rotation of eccentric vertical pivot-rotor assembly, and in the compressor proper functioning, above-mentioned rotation is about 3000-3600 rev/min.
Yet in being usually less than 2000 rev/mins the slow-speed of revolution, part lubricated very inadequate do not have sometimes at all, and this is the cause that no longer can reach the upper end 9a of oil duct 9 owing to the oil column that forms in oil duct 9 internal cause centrifugal actions.
According to accompanying drawing, oil pump of the present invention comprises a pump rotor 10 and a tubular sleeve 20, and tubular sleeve 20 for good and all is immersed in the oil of oil groove 2.Pump rotor 10 is connected in eccentric vertical pivot-rotor assembly so that rotate with it when oil pump is worked.In the present embodiment, described connection is that direct contact between the adjacent madial wall of lower end 9b of the outer side wall of the upper end 10a by pump rotor 10 and oil duct 9 realizes.Upper end 10a also can limit a connecting head 11, and as shown in Figure 4, the embodiment of Fig. 4 will be described below.It is identical being used to indicate the label of the configuration aspects of technological scheme in 4 at Fig. 3, and unique difference is put in marks on the label in the structure of Fig. 4 " ' ".
Yet, also can adopt other structure of top 10a of pump rotor 10 and other the fixing technological scheme on eccentric vertical pivot-rotor assembly thereof and obtain identical effect.
Though do not draw, described oil transportation road also can adopt other structure, as adopting along the axial length of pump rotor 10 many oil ducts that be provided with, outside and/or inner.Obvious described structure can also have outside oil duct, and these oil ducts are that sealing forms along its partial-length at least, play the function of tubular sleeve 20 structure characteristics.
The bundle that the structure of described pump rotor 10 intrinsic tubulose oil ducts can also make above-mentioned those oil ducts upwards disperse from the lower end formation of pump rotor 10 at least.In the described organization plan of Fig. 3, the lower end 10b of pump rotor 10 has mutual opposed a pair of radial groove 13 on the diameter, radially extend to the intended distance of the geometrical axis that leaves pump rotor 10 from the periphery of lower end 10b, do not reach oil transportation road 12, in this structure, oil transportation road 12 is between the upper end 10a of the edge of lower end 10b and pump rotor 10.
Though do not draw, also can adopt other structure, and not change its effect, many grooves 13 for example, they preferably radially can be communicated with in this regional center of pump rotor 10.
The radially restriction of above-mentioned radial groove 13 is because the cause of oil is always arranged on the neighbouring part in oil transportation road 12 in this zone.Connection between above-mentioned groove can make oil flow away by radial groove 13, causes the loss of pumping power.When oil transportation road 12 began above the zone at the radial groove place of pump rotor 10, the connection between the described groove can occur and not damage the performance of oil pump.Also according to limiting with the desired structure feature of pump desired properties and tubular sleeve 20, this will be explained below for the height of radial groove 13 and width.
Every radial groove 13 sliding blade 14 separately of packing within it, sliding blade freely is placed in the radial groove 13, so that between the off-position of working position of pulling and withdrawal, move radially by radial groove, when the working position, described blade tends to from relevant radial groove 13 radially outwards outstanding, and at off-position, blade 14 is accommodated in the relevant radial groove 13.The effect of blade-groove will be described below.
Between upper opening 20a and lower openings 20b, limit a cylindrical shape towing oil pocket 21, its diameter is greater than pump rotor 10 diameters, its height is corresponding to the height of radial groove 13, described towing oil pocket 21 has a filler opening 21a who is communicated with the lower openings 20b of tubulose socket 20 and is connected the oil outlet 21b that oil duct 22 is communicated with the oil transportation road 12 of pump rotor 10 with one by one, connects oil duct 22 by tubular sleeve 20 supportings.Connecting oil duct 22 has to be located at towing oil pocket 21 belows; Receive oil part for one and admit oil, and described oil is supplied to the bottom that connects oil duct 22, and one rises the oil part and will deliver to oil transportation road 12 from the oil that connects oil duct 22 bottoms from the oil outlet 21b of towing oil pocket 21.
Filler opening 21a and oil outlet 21b limit in the following manner, promptly, in the process that sliding blade 14 moves between off-position and working position, towing oil pocket portion in the upstream of the downstream of described oil outlet and described filler opening, only leave thin oil film, it can not influence pump oil efficient, and further makes between the adjacent portion of the bottom of this regional pump rotor 10 and described towing oil pocket 21 inwalls and lubricated.Between the described wall near being since pump rotor 10 with respect to the cause of off-centre of towing oil pocket 21.
For avoiding because of pump rotor 10 rotates, part rubbing contact and the wearing and tearing that cause, above-mentioned lubricated be essential.
Oil needs the pumping of other lubricated part to realize by following mode from oil groove 2 to bearing 4 with compressor operating.The rotation of rotor-eccentric vertical pivot assembly and pump rotor 10 causes the centrifugal force on sliding blade 14, forces described blade to remove and make the outer end of described blade always to be resisted against on the wall of towing oil pocket 21 from relevant groove 13 in compressor part rotation process.When process was pulled the inlet hole 21a of oil pocket 21, as the blade in towing oil pocket 21, blade 14 forced the oil from oil groove 2 to flow to oil outlet 21b.
Because the degree of eccentricity between pump rotor 10 and the towing oil pocket 21, in the half way around process of pump rotor 10, promptly, between the tangent position and pump rotor 10 and towing oil pocket 21 maximum spacing positions of pump rotor with respect to the inwall of towing oil pocket 21, each sliding blade 14 is outwards oppressed from relevant radial groove 13.From the zone of maximum spacing, though sliding blade 14 still under centrifugal action from relevant radial groove 13 by to external pressure because the pump rotor and the degree of eccentricity of pulling oil pocket, blade begins towards the retraction movement of radial groove inboard.
In this structure,, just look like that the situation of spring is set between the bottom of inner and each radial groove 13 of each sliding blade 14 is the same about the centrifugal force and the eccentric of part plays elastic element on sliding blade 14 effect.
When reaching the oil outlet 21b of towing oil pocket 21, the oil that is delivered by sliding blade 14 is brought to connection oil duct 22, and described oil is delivered to oil duct 9 by oil transportation road 12 therefrom, so that be dispensed to bearing and contiguous part.
In organization plan shown in Figure 4, the lower end 10b ' of pump rotor 10 ' preferably integral body is provided with three radial blades 15, and these blades are fixed, and are hard, waits angular distance to distribute each other, extend from the bottom in oil transportation road 12 ', and inswept towing oil pocket 21 ' inboard.Though do not draw, also can adopt other structure and do not change effect, wherein one or more blades are hard or flexible, and are all-in-one-piece or be connected can on the pump rotor.
As shown in Figure 4, tubular holders 20 ' has a upper inlet 20a ', and it is formed on the central opening on the tubular sleeve 20 ' so that the lower end 10b ' of the pump rotor 10 ' of packing into one heart also has a lower exit 20b '.Upper inlet 20a ' also forms filler opening 21a ' in this structure, oil is from oil groove 2 and be pumped to oil transportation road 12.The oil that lower inlet 20b ' is communicated with from towing oil pocket 21 ' with oil transportation road 12 '.
Towing oil pocket 21 ' also has an oil outlet 21b ', it is communicated with the oil that is pulled by radial blade 13 ' with the connection oil duct 22 ' of tubular sleeve 20 ', connect oil duct 22 ' and be arranged on towing oil pocket 21 ' below, described connection oil duct has one in the face of the oily part of receiving of oil outlet 21b ' and the oily part of sending in the face of 12 ' lower end, oil transportation road, and this is the same to the description of organization plan shown in Figure 3 with the front.
In this structure, in the rotation process of eccentric vertical pivot-rotor assembly and pump rotor 10 ', the oil that enters the upper inlet 20a ' of tubular sleeve 20 ' flows to towing oil pocket 21 ', then, pulled on the inwall of towing oil pocket 21 ' by radial blade 15, connect oil duct 22 ' until reaching, as the description of front as described in oil be transported to oil duct 9 therefrom.
Claims (10)
1. the mechanical oil pump of variable speed hermetic compressor, it comprises a capsul (1), described capsul defines an oil groove (2) and wherein is equipped with in the bottom: the cylinder body (3) of an eccentric vertical pivot of supporting (5), the rotor (8) of a motor (6) is contained on the eccentric vertical pivot, described eccentric vertical pivot (5) is provided with at least one oil duct (9), its lower end (9b) passes to the lower end 5 (b) of eccentric vertical pivot (5), its upper end passes to the outside of going up the middle part of eccentric vertical pivot (5), eccentric vertical pivot-rotor assembly is connected in pump rotor (10 in its underpart, 10 ') a upper axial extension part and a tubular sleeve (20,20 '), described tubular sleeve is connected in an inertia part of compressor and centers on the pump rotor (10 that is immersed in the oil, 10 ') at least a portion, described oil pump is characterised in that it comprises:
-one towing oil pocket (21,21 '), it is limited to tubular sleeve (20,20 ') interior so that the pump rotor of packing into is immersed in the part of part in the oil, and has the filler opening (21a that at least one is communicated with oil groove (2), 21a ') and an oil outlet (21b, 21b '), described pump rotor and tubular sleeve somewhere sealing vertically contact;
-at least one pulls blade (14,15), it has one and be installed in pump rotor (10 in towing oil pocket (21), the end of described end portion 10 ') and one always with towing oil pocket (21,21 ') contact angledly will be by filler opening (21a so that reach diametrically for inwall, 21a ') oil from oil groove (2) of Jie Shouing is forced to the opposed end of the oil outlet (21b, 21b ') of towing oil pocket (21,21 ');
-at least one oil transportation road (12,12 '), along pump rotor (10,10 ') at least a portion of the portion that extends axially limits, so that make its lower end by a connection oil duct (22 by tubular sleeve (20,20 ') carrying, 22 ') with towing oil pocket (21,21 ') oil outlet (21b, 21b ') fluid is communicated with, and makes its upper end pass to the lower end (9b) of oil duct (9).
2. oil pump as claimed in claim 1 is characterized in that: each towing blade (14) is formed by sliding blade, and it is contained in the groove separately (13) on the part of lower end (10b) of pump rotor (10).
3. oil pump as claimed in claim 2 is characterized in that: each sliding blade (14) freely is contained in separately the groove (13), radially is resisted against movably under centrifugal action during with convenient rotor rotation on the inwall of towing oil pocket (21).
4. oil pump as claimed in claim 3 is characterized in that: described pump rotor is arranged in the towing oil pocket (21) prejudicially.
5. oil pump as claimed in claim 2 is characterized in that: pump rotor (10) is provided with a pair of groove (13), and they are opposed mutually on diameter.
6. oil pump as claimed in claim 1 is characterized in that: each towing blade (15) is connected in the lower end of pump rotor (10 ').
7. oil pump as claimed in claim 6 is characterized in that: the filler opening (21a ') of towing oil pocket (21 ') is to be limited by the upper opening of tubular sleeve (20 ') (20a '), and tubular sleeve (20 ') surrounds pump rotor (10 ')
8. oil pump as claimed in claim 1 is characterized in that: described oil transportation road (12,12 ') is in pump rotor (10,10 ') body.
9. oil pump as claimed in claim 8 is characterized in that: described oil transportation road (12,12 ') has upper and lower end, and they pass to the pump rotor upper end of (10,10 ') (10a, 10a ') and lower end (10b, 10b ') respectively
10. oil pump as claimed in claim 9 is characterized in that: described oil transportation road (12,12 ') is concentric with the geometrical axis of pump rotor (10,10 ').
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94195098 CN1074092C (en) | 1994-04-04 | 1994-04-04 | Mechanical oil pump for a variable speed hermetic compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94195098 CN1074092C (en) | 1994-04-04 | 1994-04-04 | Mechanical oil pump for a variable speed hermetic compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147846A CN1147846A (en) | 1997-04-16 |
| CN1074092C true CN1074092C (en) | 2001-10-31 |
Family
ID=5039622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94195098 Expired - Fee Related CN1074092C (en) | 1994-04-04 | 1994-04-04 | Mechanical oil pump for a variable speed hermetic compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1074092C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11480171B2 (en) | 2019-12-31 | 2022-10-25 | Danfoss (Tianjin) Ltd. | Oil pump and scroll compressor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016070897A1 (en) * | 2014-11-03 | 2016-05-12 | Arcelik Anonim Sirketi | Improved lubricating device for use in a hermetic compressor |
-
1994
- 1994-04-04 CN CN 94195098 patent/CN1074092C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11480171B2 (en) | 2019-12-31 | 2022-10-25 | Danfoss (Tianjin) Ltd. | Oil pump and scroll compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1147846A (en) | 1997-04-16 |
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