CN85103435A - Differential pressure lubrication system in the rotary piston compressor - Google Patents

Abstract

A kind of oscillating piston refrigeration gas compressor, the oil groove (11) of its housing (1) bottom directly communicates with the interior space of piston (4) (16) via the fuel supply line (10c) in the side plate (10).Piston both sides and gas compressor side plate have enough gaps between (9,10), but but communicate space (7) voltage supply mechanism of qi exhaust in the housing between the restricted quarter (16) and plenum chamber (6) and the induction chamber (18).Put on the inside that stagnation pressure official post lubricant oil on the fuel supply line respective ends stably flows to piston, thus each movable part of lubrication pressure mechanism of qi normally.

Description

Differential pressure lubrication system in the rotary piston compressor

The present invention relates to eccentric rotary piston, a kind of modified model differential pressure lubrication system in the slide plate type fluid gas compressor is especially for compression refrigeration gas in refrigerator and the air regulator.

In this class mill run, motor and all be installed in the pressure housing or casing of a sealing by this electric motor driven rotary piston compressor.By the cooling gas of external storage or other similar supply for receptacles after compression, be discharged in the space in the housing, and flow to vapour condenser, vaporizer or other same devices thus.Oil groove is arranged in the housing, its surface directly contacts with the high pressure gas that comes from compressor, for each SLALOM kinetic friction member in the lubrication pressure mechanism of qi normally, must set up the mobile passage of a lubricant oil, for this reason, the high voltage terminal of this passage or fuel feeding end will immerse in the oil groove fully, and low voltage terminal or oil revolving end will communicate with the intakeport of compressor.Like this, the fuel feeding end of this passage and the total pressure head between the oil revolving end just make lubricant oil do steady flow through each friction member of gas compressor.It is too fast mobile that but lubricant oil often appears in this sizable pressure reduction thereupon, and gas compressor is loaded, and produces vibration, and a large amount of lubricant oil of result are entrained into the refrigeration fluid.

Be devoted to solve in the process of this " overlubricate " problem, as disclosed among the day disclosure special permission specification NO131393/83 and as shown in Figure 1, the low voltage side of fuel supply line or reflux side communicate with the plenum chamber of gas compressor, so that reduce the total pressure head that easily influences lubrication system, or rather, by being installed in the starting of the motor [2] in the seal casinghousing [1], bent axle [3] is rotated, volume with the pressure air chamber [6] that reduces the delimitation between rotary piston [4] and the compression cylinder [5], compress the compressed gas of cooling gas that feeds from (not indicating the figure) such as reservoir or other similar containers thus and be discharged into space in the housing [7], thus pressurized gas is supplied with vapour condenser or other same devices etc. through relief opening [8].Lubricant oil [11] enters gas compressor by the formation passage [9c] in the side plate [9], and lubricated continuously near the bearing [10a] in bearing [9a], eccentric wheel [3a] and the side plate [10] of termination sealing [12].Lubricant oil flows into plenum chamber [6] by the return flow line [13] in the side plate [10] then, and the pressurized gas of space [7] is discharged in entering housing thus, turns back to oil storage tank again.Bearing [9a], [10a] have bigger gap, shown in obvious among Fig. 1, for lubricant oil has been set up an effective runner, and tolerance or gap between the two ends of piston [4] and side plate [9], [10] are quite accurate, effectively the space in the piston [16] and plenum chamber [6] are separated thus, essential lubricant oil is supplied with plenum chamber [6] by return flow line [13].

Because between the pressure of inspiration(Pi) and exhaust pressure of middle pressure, when exhaust pressure was applied directly to oil groove surface [11a], the pressure reduction that puts on the other end of oily runner just was lower than the pressure reduction in the above-mentioned more common structure widely in the plenum chamber [6].Thereupon, reduce oily flow velocity, therefore avoided the problem that is occurred under the situations such as unsuitable load, vibration.

The shortcoming of structure shown in Figure 1 is that the pressure on the bearing end [10b] of side plate [10] must separate with the exhaust pressure in space in the housing [7].This just needs a kind of mechanical seal [14], has not only increased cost for this reason, and has increased the mechanical loss that produces owing to friction, another kind of wearing and tearing source also occurred.Another shortcoming is the current limliting place that oil duct has plurality of continuous, as gap and the bearing [10a] between bearing [9a], eccentric wheel and piston [4] internal surface.Occur on any one position in the above-mentioned position local obstruction will cause overheated, block, even whole gas compressor damages.

The present invention attempts to overcome effectively above-mentioned shortcoming of the prior art, differential pressure lubrication system in a kind of rotary piston compressor of simple and inexpensive is proposed for this reason, wherein the outlet of oil supply gallery or refluxing opening directly communicate with the piston circuferential spacing that is arranged in the eccentric wheel side, the allowable clearance of the crankshaft bearing in the side plate is littler than prior art, passes through herein in a large number to outflow to prevent lubricant oil.Leave enough gaps between piston two ends and the side plate, can make oil be enough to flow into induction chamber and plenum chamber, and can also guarantee enough wiper seal.This device is without any need for bearing seal and axle envelope.Thereby reduced the complexity of cost and gas compressor.

Marginal data

Fig. 1 is a kind of rotary piston compressor longitudinal section with differential pressure lubrication system in the prior art.

Fig. 2 is a kind of rotary piston compressor longitudinal section with differential pressure lubrication system of the present invention.

Fig. 3 is the cross-sectional view of gas compressor shown in Figure 2.

Fig. 4 is the partial cross section perspective view of a gas compressor side plate of the present invention, band bent axle and be bearing in eccentric wheel on the bent axle in the side plate.

Fig. 5 is the longitudinal section of the another kind of concrete device of gas compressor of the present invention.

Fig. 6 is for Fig. 5 latus inframedium and be bearing in bent axle/eccentric partial cross section sectional view on the side plate.

Fig. 7 is the sectional view of another piece side plate among the present invention.

Fig. 8 is the perspective view of rotary piston in a kind of modified model of the present invention.

Fig. 9 is the partial sectional view of the another kind of concrete device of the present invention.

Figure 10 and Figure 11 are the amplification view of Fig. 9 latus inframedium bearing.

Most preferred embodiment describes in detail

First embodiment of the invention is with reference to Fig. 2 Fig. 3, and wherein related numeral is the same with shown in Figure 1 same member institute target numeral.

Slide plate [17] separates plenum chamber [6] in the compression cylinder [5] and induction chamber [18], plenum chamber communicates with exhaust port [22], induction chamber communicates with sucking pipe [19], the outer surface [4a] of the rotary piston of eccentric motion [4] makes slide plate reciprocating, oil supply pipeline [10c] in side plate [10], its lower end directly communicates with oil groove [11], and its upper end directly communicates with inner circumferential space [16] in the plunger.Side plate bearing [9a] and [10a] are made by machining, and tolerance is more accurate than the tolerance among Fig. 1, to limit oil thus to outflow.Enough numerical value is left in gap between the two ends of piston [4b], [4c] and two blocks of side plates [9], [10], about tens microns, can make lubricant oil unimpeded between space [16] and plenum chamber [6] and induction chamber [18], but still can keep necessary wiper seal.

In this structure, the exhaust pressure in space [7] forces oil to rise in the housing, enters space [16] through fuel supply line [10c].Because gap on piston two ends [4b], [4c] is limited communicating with plenum chamber [6] and induction chamber [18], so that the pressure of oily rising is in a certain numerical value between pressure of inspiration(Pi) and the exhaust pressure.Like this, enter the lubricated effectively side plate bearing [9a] of oil, [10a] in space [16], and the contact surface between eccentric shaft [3a] and plunger [4] inner side surface, this a small amount of rather than a large amount of oil is by " suction " and " extraction " plenum chamber and induction chamber, make them be coated with the film that oils, and lubricated thus its surface.Some lubricant oil are arranged, and [16] enter shell space [7] from the space through side plate bearing [9a], [10a], and a large amount of oil will be discharged with the mist of oil shape through exhaust port [22] from plenum chamber [6].Aggegation becomes the oil than coarsegrain to be back to oil groove [11] owing to the high pressure in space [7] for wherein tiny elaioleucite or oil droplet; some a small amount of mist of oils will be sandwiched inevitably to be got rid of through relief opening [8] in the cooling gas that has compressed; but this is a normal phenomenon; do not impair the feature of native system significantly; if must or requirement be arranged, in native system, can provide a kind of following current separator (downstream separafor) with filtering and this elaioleucite of recovery.

Though the figure among Fig. 4 is from the negative or from the back side of Fig. 2, Fig. 4 has still illustrated shown in Fig. 2 and Fig. 3 side plate [10] used in the concrete device and in more detail by the bent axle [3] of side plate supporting.Terminate on the fuel supply line [10c] in [10] grooves of side plate [10d], eccentric wheel [3a] has a skewed slot or spiral chute [36], and the bent axle of settling in the side plate bearing [10a] partly has a similar skewed slot or spiral chute [3c].Because an end of groove [3c] whenever circles with bent axle and directly communicates once with groove [10d], so groove [10d] and groove [3c] make the lubricant oil lateral dispersion easily in whole bearing [10a].Though not high-visible in Fig. 4, groove [10d] also directly leads to the space [16] of eccentric wheel the right upper piston [4] as shown in Figure 4; Groove [3c] makes distribution of lubrication oil also be assigned to opposing sideplates bearing [9a] thus to the space [16] on the eccentric wheel left side easily.

The feature of the concrete device among Fig. 5 and Fig. 6 is, motor stator [2a] is a certain distance of rotor [2b] axial displacement [1] relatively, bent axle groove [3c] is elongated to apart from a certain distance of side plate bearing end [10b] (m), and thrust bearing or bearing support [3d] are contained on the eccentric end of nearside plate [9].In this structure, the rotor of motor and the axial displacement between the stator have produced a kind of thrust power, arrow indication among its direction such as Fig. 5, thrust bearing [3d] has born this thrust power, and this device guarantees to offset consistently the thrust power that bent axle is applied side plate [9].This has just prevented any vibration effectively and has followed noise, because these all are by the between centers gap of bent axle and move and produce.

Groove on the eccentric wheel [3b] is stretched on the thrust bearing [3d], and this can guarantee the normal lubricated of plane, there and make the lubricant oil transverse distribution to side plate bearing [9a].And bent axle groove [3c] reaches a certain distance of distance between bearing end [10b] (m) and can guarantee that side plate bearing [10a] is lubricated fully effectively.

Figure 7 shows that a kind of structure of side plate [9], a spiral chute is wherein arranged in the bearing part [9a] and reach a certain distance of distance between bearing end [9a] (n), to guarantee that lubricant oil is laterally rationally distributing, as a kind of conspicuous scheme, can open a groove corresponding with 9d on bent axle left end as shown in Figure 6 comes for it, this groove is similar to groove [3c]

Figure 8 shows that a modified model piston, wherein the internal surface of rotary piston [4] or bearing surface have been opened many spiral chutes [4d], replace the groove [3b] in the eccentric shaft.

A center coaxial aperture [3e] is bored in Fig. 9～11 in the bent axle, reach from the compressor termination slightly to exceed bearing termination [10b], and bore radially exit orifice [3f] at this place, loads onto lid [20] on side plate [9] two bearing axle sleeves of side plate [9] are all sealed.Outlet valve [21] communicates with plenum chamber [6] through relief opening [22].Ya Suo cooling gas flow at high speed shown in the arrow in the figure like this, [3e] advances from central hole of the crankshaft, and [3f] goes out at radial hole.High velocity air is introduced in as shown in the figure the hole [3e] because lid [20] is installed in extremely near the bearing termination [9b] of side plate.The aperture in same hole [3f] is quite little, and high velocity air also can pass in the bearing termination [10b] by another side plate.If the bearing termination of two blocks of side plates is around bent axle place difference chamfering [9e] and [10e], as shown in Figure 10 and Figure 11, then high velocity air causes the chamfering recess to become low pressure area, and this helps oiling agent sucking-off from groove [9d] and [9e], to guarantee stably to bearing [9a] and [10a] end fuel feeding.

Though have only horizontal gas compressor shown in the enforcement illustration, of the present invention one this principle can similarly be used for horizontal and vertical gas compressor, and this is self-evident for the skilled person.

For vertical gas compressor, side plate [10] is positioned in the surface [11a] of oil groove and fuel supply line [10c] is only extended into one downwards and at the pipe that oil groove stops, and clearly, fuel supply line can be arranged equally in the side plate [i9], or thus, a fuel supply line can be arranged at two blocks of side plates.This pipeline also can be an independent pipe, stretches into space [16] from oil groove by a side plate two blocks of side plates.

As a typical example, the gap between bent axle and side plate bearing [9a], [10a] is approximately 10～12 microns, and the interval between piston [4] two ends and the two blocks of side plates is approximately 3～30 microns.

Claims (7)

1, a kind of rotary piston, slide plate fluid gas compressor, refrigeration gas compressor particularly, it comprises a seal casinghousing [1], a motor [2] that is contained in the housing, one by electric motor driven axle [3], a compression cylinder [5] that is contained in the housing, be positioned at its opposite end side plate [9,10] between and rotating shaft by this compression cylinder and two blocks of side plates, by the bearing [9a in two blocks of side plates, 10a] supporting, a hollow rotary piston [4] that is contained in the compression cylinder, one is contained in the piston and is fixed on rotatable eccentric wheel [3a] on the axle, a slice radially is placed in the slide plate [17] in the compression cylinder: be separated into plenum chamber [6] and induction chamber [18] with the engagement of piston appearance and compression cylinder, an intakeport [19] that leads to induction chamber, one leads to the exhaust port [22] of space in the housing [7] and the oil groove [11] that is positioned at housing bottom by plenum chamber, a kind of feature of modified model differential pressure lubrication system is: an end of fuel supply line communicates with oil groove, space [16] in the other end and the piston communicates, compression refrigeration gas in the shell space forces lubricant oil to enter the low pressure piston space from fuel supply line to the oil groove applied pressure thus, makes each movable part of gas compressor lubricated.

2, according to the described a kind of gas compressor of claim 1, wherein fuel supply line [10c] is defined in the side plate in two blocks of side plates.

3, according to the described a kind of gas compressor of claim 2, wherein a corresponding end of said fuel supply line is determined by the groove [10d] in the said side plate upper bearing (metal) [10a].

4, according to the described a kind of gas compressor of claim 3, wherein lubrication distribution spiral chute [3b, 3c] in eccentric wheel and said side plate hold upper support the axle part in form; Axle whenever circles, and groove communicates once with groove on the axle.

5, according to the described a kind of gas compressor of claim 3, wherein many distribution of lubrication oil grooves form on the piston inner circumferential surface.

6, according to the described a kind of gas compressor of claim 4, wherein the rotor of motor and stator are made and produce an axial thrust power in the running by axial displacement; An eccentric side is adorned a thrust shaft block, puts on said thrust power on the adjacent side plates with counteracting.

7, according to the described a kind of gas compressor of claim 4, its axis with centre bearing gas compressor surpass on one side and just in time near the side plate bearing outermost end of motor a bit on; Radial hole [35] makes the bottom of this center hole communicate with shell space, the outermost end chamfering of two side plate bearings [9e, 10e]; End cap [20] is exhaust port with from motor side plate bearing sleeve sealing farthest, and compression refrigeration gas passes two bearing ends formation flow at high speed through the center hole of axle like this, and causes low pressure at the chamfering place, makes lubricant oil through bearing and sucking-off.

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