CN85107168A - The suction tube seal of rotary compressor - Google Patents

Abstract

In a rotary seal formula compressor, between cylinder (37) and suction pipe (24), provide suction tube seal (104).Suction pipe end (100) puts in the closed compressor shell (10) and as with welding method it is fixed on there hermetically.Be positioned at the compressor cylinder (37) of shell (10).Opening (90) is arranged on its cylindrical wall, put in the suction pipe (24) terminal (100) of shell (10) with installation.The opening internal diameter is a bit larger tham the suction pipe external diameter and is installed in the opening so that suction pipe can endwisely slip.Through the flexible seal device (104) of putting into the suction pipe outside, suction pipe (24) is sealed on the cylinder (37).The C shape ring (104) that seal arrangement preferably is made of the oil resistant flexible rubber.

Description

The suction tube seal of rotary compressor

This invention is about at refrigeration system, air regulator for example, the sealed rotary compressor of compression refrigerant in freezer and the like.This invention is particularly about being sealed in suction pipe the method on the rotary seal formula compresser cylinder.

Usually, the sealed rotary compressor of prior art comprises the shell of a sealing.In the enclosure, be provided with an electric motor and a compressor set.Electric motor is connected on the bent axle that eccentric part arranged.The eccentric part of Nagqu axle is positioned at the compressor cylinder tube.Be provided with a roller in cylinder barrel, it is installed in the eccentric part of bent axle, thereby is driven.Roller and a sliding blade are in conjunction with the refrigerant that comes in the compression cylinder tube.

What here the rotary-type enclosed compressor of Jie Shiing had a pressurization usually is the can of flash.By suction pipe and discharge tube, compressor just can be connected on the refrigeration system.In the compressor of prior art, motor stator may be with shrinking the inwall of mount at shell, and simultaneously, compressor cylinder normally is welded on the shell.A motor rotor is supported on and drives bent axle in the bearing.Suction pipe runs through shell and is connected to the there hermetically.The suction pipe end that extends in the shell is connected to cylinder and guides the low-pressure refrigeration agent directly to arrive compression in the cylinder barrel.Suction pipe is connected to the method for cylinder and normally beats in opening of cylinder wall by compression fit or pipe.On this end, the suction pipe external diameter is made the internal diameter greater than cylinder openings, so just can obtain a good friction fit.

Cylinder, the tolerance limit of roller and blade usually must be very strict, for example ten thousand/inch.So very the reason of close tolerance is in order to lower the leakage of refrigerant in the compressor, thus the efficient that compressor pump is reached allow.Because cylinder is being welded on the shell and suction pipe is being compressed or assembly manipulation that clock is thrown in the cylinder openings has the tendency that makes cylinder deformation, cause the disalignment between blade groove distortion and cylinder and the bearing thus, the cylinder of prior art is usually designed to a bigger axial dimension, and the result is relative large-scale structure.By the cylinder of thick a, heavy type structure is provided, the suction pipe that is press-fitted by enough cylinder substances encircle, thereby distortion is reduced to minimum, keeping the geometrical shape of blade groove and bearing to neutrality, keeping accurate tolerance limit simultaneously.If distortion can not reduce to minimum and can not keep the size tolerance limit in the process of welding and forging, the leakage in the compressor will be excessive.

In a kind of therein compressor of the prior art that low limit shell arranged, being tightly connected by the sealing of O shape ring and forming of suction pipe and suction pipe silencing apparatus.O shape ring is being applied in the compressor arrangement, and O shape ring can not be in the place of the big pressure difference of compressor, and for example the place of suction and exhaust provides one to be tightly connected.In addition, the compressor of this prior art is to belong to reciprocating type rather than revolving, so do not need a thin cylinder that is connecting suction pipe hermetically and having big pressure drop at the place of being tightly connected here.

A suitable suction pipe this problem that is tightly connected is provided in the cylinder in a flash rotary compressor, and the solution of prior art is to utilize a thick cylinder, and has a suction pipe to be pressed on wherein.This has individual shortcoming, is exactly length and area of heat transfer that it tends to increase refrigerant leakage approach, thereby tends to reduce the efficient of compressor.In compressor operation, there is the place of different degree of pressure in the compressor.For example, the compressor cylinder tube has one to inhale an intake section and the high-pressure section depress at axle simultaneously, is being compressed at high-pressure section gas.And compressor case itself is under the high pressure, because refrigerant by compression directly is discharged in the shell by cylinder barrel.With above-mentioned said, importantly make refrigerant by high pressure region to the leakage in low pressure area keeping minimum because the refrigerant of these leakages is being represented lost work and is being lowered the efficient of compressor.So it is very important for a short time that the low pressure separately and the boundary length of high pressure region are made what try one's best, this just understands very naturally that to cylinder height be the decisive size of an influence leakage, because it is to be directly connected to compressor cylinder tube interior separately high pressure and low pressure area boundary length.For example, contacting the sliding blade tip length of roller and blade and forming the border that separate high and low pressure cylinder tube area with crack between the blade groove.Utilize a thin cylinder, this decision size can be maintained to very little, and can also reduce by the refrigerant leakage on blade and other borders.

The thick cylinder structure of prior art has additional shortcoming, and the compressor that has increased weight is unfavorable, because these compressors are to be used in the domestic appliance, and light weight structure preferably.Therefore, thin cylinder is optimal.

Another shortcoming of the compressor arrangement of prior art is to provide some special vibration-absorbing structures for stretching into compressor and the suction pipe end between shell and cylinder, and when compressor cuts out, the pressure in the compressor case tends to fluctuation and tend to increase.Such pressure oscillation makes the shell bending.Because the suction pipe of prior art is to be fixed on cylinder and the shell,, thereby prevent that shell and cylinder from breaking with the sealing of suction pipe because the shell bending that variable pressure causes needs adjusting.So being equipped with shock tube and other device, the structure of prior art regulates stressed effect on the suction pipe.So need regulate stress on the suction pipe with a straightforward procedure, guarantee suction pipe, between shell and the cylinder excellent sealing is arranged.

The single length of only tending to increase the leakage approach of the large scale structure of the compressor cylinder of prior art, and the heat transfer area of increase and suction gas like this.These heat transfers are undesirable and tend to reduce the efficient of compressor.Reach best efficient so preferably thereby heat transfer area is reduced to the minimum compressor that makes.

The rotary seal formula compressor of prior art has another shortcoming, and it is to utilize annex that suction pipe is sealed on the cylinder, thereby because of the price of part and the expense of Assembly part, has increased the price of compressor.

The other shortcoming of thick cylinder is the size that it tends to increase compressor.Because closed compressor is to be used in the object of domestic appliance for example, so the size of compressor will be to minimum in the ideal.

The present invention provides improved being tightly connected between suction pipe and compressor cylinder, the present invention has overcome the shortcoming of the rotary compressor of above-mentioned prior art.

Wherein a kind of form of the present invention is to provide a suction tube seal between compressor cylinder and suction pipe to sealed rotary compressor.Suction pipe runs through compressor, and shell also is fixed on the casing wall.The diameter that stretches the suction pipe end of shell is made into to be slightly less than the diameter of admitting the cylinder openings that this suction pipe do not hold.An annular groove holds the O shape ring of a flexibility simultaneously round opening.This O shape ring is sealing the suction pipe end and can slide on cylinder.

According to structure of the present invention, provide a hermetic compressor that a shell and a cylinder are arranged.Cylinder has an opening at cylindrical wall, is being communicated with cylinder barrel therefrom.One refrigerant suction pipe runs through the compressor inner casing and is sealed to the there, and puts in cylinder openings again.The diameter of suction pipe is the diameter less than opening.One flexible O shape is sealed on the cylinder around opening and suction pipe, thereby suction pipe can slide in opening and when the shell bending, it can move axially with respect to cylinder.

To be O shape of utilization ring form slipper seal to an advantage of structure of the present invention between suction pipe and cylinder is connected, because in the process of assembling suction pipe, can not produce deformation force on cylinder, so can be with approaching cylinder.There is the cylinder of little axial dimension can reduce with one by the formed leak path length in border of separating compressor low pressure and high pressure region.For example, when the compressor aspect ratio hour, the most advanced and sophisticated area of sliding blade that is contacting roller and blade groove crack also can be smaller.So the refrigerant leakage quantity by the high pressure place of tube through vane tip and side to the low pressure place of tube can be reduced, so the efficient of compressor can improve.

Moreover another advantage of structure of the present invention is the sliding sealing device that utilizes between a suction pipe end and the compressor cylinder, can get rid of required absorption plant, this device can absorb because of casing internal pressure changes the shell the cause flexural stress with respect to cylinder, can adapt to those stress because encircle formed sliding sealing device by O shape.

Another advantage of the compressor of making according to the present invention is to have got rid of special annex for suction pipe is sealed in the cylinder, has also got rid of suction pipe is fixed on hammering required on the cylinder or extrusion process.

The compressor of manufacturing has another advantage according to the present invention, through having got rid of the operation that extruding or clock are beaten, the distortion possibility of having got rid of compressor cylinder is kept bearing preferably simultaneously to geometrical shape neutral and groove, thus the excessive wear that reduces the leakage in the compressor and lower bearing.

Other advantage according to compressor of the present invention is to have utilized a flexible O shape ring suction tube seal and thin cylinder, has reduced the size and the weight of compressor.

A wherein form of compressor of the present invention has comprised that a shell, is fixed on the electric motor of outer casing inner wall.With a bent axle that is pivotally connected to motor in the enclosure.A cylinder that is positioned at enclosure has a pressurized chamber, and a Piston Compression that is operably connected to bent axle refrigerant inside.Thereby a discharger is positioned at cylinder and operates a compression refrigerant with the pressure chamber and is discharged to compressor case.Open communication on the cylinder wall the pressure chamber.One suction pipe runs through shell and is connected to the there hermetically.It is one slidably terminal and be received in the cylinder openings that this pipe has.Flexible sealing arrangement is inserted between cylinder openings wall and the tube wall being connected on the cylinder with managing end seal.

Another form of the present invention can be provided here again, a rotary seal formula compressor, it has comprised that a shell and one are positioned at shell work and the electric motor that can walk around son is arranged.One suction pipe is fixed on shell hermetically, and its end portion stretches in the shell.One cylinder be in the shell and and rotor coaxial, and it is connected on the inwall of shell, this cylinder has a columniform tube therein.A rotatable bent axle is received within the tube, thereby and by the rotor drive to drive the piston apparatus compression refrigerant wherein in the tube.Exhaust port is positioned on the cylinder so that the compressor and freeze agent is discharged from tube, and an opening is positioned on the cylindrical wall of cylinder simultaneously, and is being communicated with bobbin.The external diameter of suction pipe end portion is less than the opening internal diameter, and this pipe can be in the opening axially slidably.Flexible seal device on cylinder, spills to prevent the refrigerant in the shell suction pipe end seal from suction tube seal.

One form of rotary seal formula compressor of the present invention provides a can, and one is sealed in shell and is fixed on the electric motor of its inwall.Wherein the end of a suction pipe stretches into casing wall and is connecting hermetically, and refrigerant is directed in the compressor.Thereby a bent axle is connected to motor and is driving with being rotated.One cylinder unit is fixed on shell, and a chamber is arranged therein, has the cylinder wall of opening being communicated with the chamber.The suction pipe end is to be slidably mounted in the opening, and flexible seal device is inserted between this opening and the pipe outer wall simultaneously, forms the compression refrigerant sealing partly in suction pipe and the shell.Piecing devices also provide and are used for suction pipe is connected on the shell, piecing devices comprise one first cylindrical flange, this pipe stretches into flange and is fixed on the there, and the second cylindrical flange partial fixing is on shell simultaneously, and first and second parts are engaged by the part of truncated cone.

The present invention also provides a kind of hermetic compressor of form again, and it comprises a shell, and one is fixed on the cylinder and a suction pipe of outer casing inner wall, and a terminal stretching, extension of suction pipe is advanced casing wall and is fixed in shell hermetically.The suction tube seal of compressor comprises an opening on cylinder, and the internal diameter of opening is a bit larger tham the external diameter of pipe.This pipe can be installed in the opening axially slidably, and a seal arrangement be placed into tube end around and perforated wall between pipe sealing in opening.

Another purpose of the present invention is to being connected of suction pipe and rotary seal formula compressor cylinder, and an improved seal arrangement is provided.

Purpose of the present invention also is suction pipe is press-fitted or beats the into needs of closed compressor cylinder in order to get rid of, thereby can utilize thin cylinder to keep the leakage of refrigerant to be in minimum.

Another object of the present invention provides an effective compressor, and manufacturing and in light weight easily, and this all is because can use a thin cylinder that adopts the slip suction tube seal.

Another object of the present invention provides one dynamical compressor is arranged.

Another purpose of the present invention is the heat transmission of lowering compressor by suction tube seal, the use of the thin cylinder of suction tube seal tolerable.Thereby increase the efficient of compressor.

A further object of the present invention is to get rid of diversified equipment to connect suction pipe and compressor.

Still another purpose of the present invention provides the sliding sealing device between a cylinder and the suction pipe, causes the leakage in the compressor to be prevented because of shell is crooked like this.

Below with reference to the description of the embodiment of the invention and in conjunction with relevant accompanying drawing, the content of being narrated above the present invention and other features and purpose and the method that reaches them all can become apparent, and the present invention itself also is easier to be understood.

Fig. 1 is the wherein side sectional view of the disconnection of an embodiment compressor of the present invention.

Fig. 2 is the disconnection bottom sectional view of this compressor along Fig. 1 line 2-2.

Fig. 3 is the amplification view of cylinder.

Fig. 4 is the amplification view that is connected the suction pipe of shell and cylinder.

Fig. 5 is the planimetric map of main bearing combination.

Fig. 6 is the sectional view along the main bearing combination of Fig. 5 line 6-6.

With reference to figure 1, this shows the side sectional view of compressor, and compressor keeps flat simultaneously.Overcoat or shell 10 are being demonstrated to possess to be had a column part 12 and top 14 and reaches part 16 down.Flange 18 is welded on the bottom of compressor.When compressor is installed on refrigeration appliance such as air regulator or the refrigerating machine, flange is used for assembling compressor.

One terminal wire harness 20 is provided as the electric power connection of power supply to compressor motor.One discharge tube 22 stretches the inside of piercing into compressor by the upper part of shell.This pipe is connected on the shell hermetically by welding.One suction pipe 24 stretches the compressor enclosure, and this describes hereinafter.The outside end of suction pipe 24 is connected to accumulator 26, lays support plate 28 inside to support filter screen 29.

One electric motor 30 is installed in the compressor case and has comprised a stator 31 and a rotor 32.This electric motor is to belong to induction form motor, has a squirrel cage rotor.Winding 33 provides rotary magnetic field as the rotation of bringing out rotor.Against the press fit of shrinkage equipment, cylinder shape stator 31 is fixed on shell 10 inwalls.In the shrinkage assembly process, shell 10 is heated expansion.Motor 31 is inserted into and locatees then, and this combination just is cooled.When combination cooling, shell 10 can dwindle and firmly catch motor stator 31 surely.

By the shrinkage assembling, bent axle 34 is fixed on the hollow endoporus of rotor 32.Bent axle 34 axially stretched a upper bearing (metal) 36 and cylinder 37, and putting in a bearing is outboard bearing 38, and the axle journal of bent axle is supported in sleeve bearing 35 and 39.Fig. 2 illustrates that clearly the master holds 36 three flanges 40, is used for bearing fixing on the point 41 on the shell 10, as fixing with welding method.

Fig. 5 and Fig. 6 clearly state, and main shaft 36 has comprised that a quite long sleeve bearing is partly 35 as axle journal or supporting bent axle 34 rotatably.Lower bearing 38 has a sleeve bearing partly 39 to support bent axle 34 terminal parts.Cylinder 37 and lower bearing 38 are fixed on the main bearing 36, as illustrated in fig. 1 and 2 by six bolts 50.Bolt 50 passes the hole 51 of main bearing and the hole 44 of cylinder block, is screwed in the lower bearing 38.

If the axial dimension of cylinder can allow that those six bolts 50 can be replaced by 12 bolts, wherein six are fixed on outboard bearing 38 on the cylinder and are screwed in the cylinder.All the other six are fixed on main bearing 36 on the cylinder and are screwed in the cylinder.

As depicted in figs. 1 and 2, bent axle 34 has an eccentric part 52 to rotate around crankshaft axis prejudicially.One cylindrical roller element 54 surrounds eccentric and when eccentric rotated around crankshaft axis, it was rolling around circular cylinder 55.Be used for making the counterweight 56 of eccentric 52 balances to be fixed, on the terminal ring 57 that is fixed on motor rotor with riveting.One rectangular sliding blade 58 is installed in the blade groove 59.Blade groove 59 is positioned on the cylinder wall of cylinder 37.It is terminal so that coherent joint is arranged blade 58 that spring 60 is pushed roller 54 to.Spring 60 is installed in the spring seat of processing on the cylinder wall 62.

Axle 34 has a lubrication hole 64, and the lubrication channel 66 of it and outboard bearing 38 is communicated with.Passage 66 receives the oil of the lubricant pump that is positioned at axle 34 centers.Oil is made progress by pump against the central opening of centrifugal force by axle, and outwards rotates to the radial passage 66 of outboard bearing 38.Axle 34 is processed with an annular opening (not showing), is used for making pump opening 68 passages 70 to use as lubricating blade.So, oil can be upwards by the passage 70 of passage 66 and blades adjacent 58, flow down cylinder through gravity and return oil groove 72 thereby flow out the cylinder top then in shell 10 bottoms 16.One radially glossy slide opening 73 is provided on the off-centre 52 of bent axle 34 with lubricated roller 54.Hole 73 be communicated with axle on 34 pump opening 68 and receive therefrom oil.Another opening is arranged on the rectangular end that cylinder 37 holds blade 58.

Be in operation, when roller 54 is rolling around chamber 55, refrigerant can enter this chamber through suction pipe 24.The volume of institute's boundary between the point of contact of and roller 54 and 55 outer peripherys, chamber terminal when blade 58, because of the rolling action of roller is reduced, refrigerant can be compressed.As shown in Figure 5 and Figure 6, pressurized gas by the opening of main bearing 78, is discharged to silencer space 84 through valve 80 and valve guard housing 82 by the cylindrical exhaust port 76 of pressure chamber through cylinder 37.On exhaust silencer catch 86, have an opening 88 to be used for a pressurized gas and directly be discharged in the compressor case 10 from space 84, and make its around motor 30 with cooling motor winding 33.

Suction pipe afterbody 24 end portion in shell 10 are received in the opening 90 in the cylinder wall.As previously mentioned, because a thin cylinder 37 is preferably arranged, the height of cylinder 37 is that axial dimension is selected to minimum.So the cylinder 37 material quantity of surrounding opening 90 along cylinder 37 axial directions are also smaller.The label 92 and 94 of this material indication in Fig. 4.Cylinder 37 is preferably made by cast iron, and cast iron is a bit loose.The porosity of cylinder material has determined to surround the minimum dimension of opening 90 as the material thickness of part 92 and 94, because this is to prevent that refrigerant is needed by the leakage of cylinder 37 walls.Make too for a short time if surround the cylinder material thickness of opening 90, having compressed refrigerant may leak by the pore of cylinder material.It is found that and prevent that the minimum material thickness that leaks from being one of 37,000 inches.Get again for a short time as this size Selection, because the porosity of material increases, the chance of leakage also can increase.

The structure that is different from prior art, the internal diameter of opening 90 is greater than the external diameter of suction pipe 24.Pipe 24 is not by the cylinder wall frictional engagement, but can slide in opening 90.Opening 60 is being communicated with cylinder barrel, but also comprises that a shoulder 96 prevents that pipe 24 from too in depth piercing in the opening.At the afterbody of pipe parts 100, also there is the diameter parts 90 that has dwindled to assist pipe 24 when assembling, to enter opening 90.

Opening 90 by 102 of the recesses of a circle round.Recess 102 has a seal ring 104 to be positioned at wherein.Seal ring 104 can be that an O shape of being made by flexible material is encircled or other proper flexibility seal rings.The material of O shape ring should be able to oil resistant, can contact with seal ring 104 because compressor is equipped with lubricant oil.Being found to be optimal material is nation's henry (Bunham), and it is a kind of neoprene of oil resistant.

As top explanation, suction pipe 24 is not to be fastened in the opening 90, but encircle 104 frictional engagement with O shape, and is slidably mounted in the opening, and suction pipe 24 is attached in the suction attachment 106 through welding, thereby is fixed on the compressor case.Joint 106 is columniform, and a truncated cone part 108 is arranged.The lower end of joint 106 partly 110 separate with suction pipe 24, and consequently existing the space between part 110 and the suction pipe 24 is space 112.Lower end part 110 is welded on a upright chimb 114 of shell 10.By this structure, when joint 106 was welded on suction pipe 24, the heat that welding process produced can lean on truncated cone part 108, and cylindrical part 110 is transmitted in the compressor case 10 from suction pipe 24, thereby anti-0 shape ring 104 burns.

When making compression shell 10 bendings because of the casing internal pressure variation, suction pipe 24 and its end 100 can axially move with respect to cylinder 37 with joint 106.Because tube end 100 is to be slidably mounted in the cylinder openings 90, encircle 1 104 through flexible O shape, just can keep sealing intact between pipe and the cylinder.

Owing to do not need cylinder openings 90 is beaten or compressed into to terminal 100 clocks of suction pipe, therefore make the deformation force that acts on the cylinder 37 keep minimum, so can use thin compression cylinder 37.Thereby blade 58, the leak path between roller 54 and the cylinder blade groove 59 just remains in minimum.Thereby the efficient of this compressor improved widely than the efficient of prior art structure, moreover utilizes a thin cylinder, and the heat transmission between cylinder 37 cryogenic gases has reduced widely, so improved the efficient of compressor more.

Provided here is the rotary seal formula compressor of a simple structure, have a flash shell 10 and a thin cylinder 37 with and because utilization one is arranged normal effective seal device 104 and the efficient of a height reaching between suction pipe 24 and cylinder 37.

Have a preferably design though this invention is described as, much less it can do more deep improvement.So this paper also comprises any variation that the present invention does according to generic principles, utilization or improvement comprise that simultaneously this paper does not have the affiliated interior known or usual application of technical field of the present invention of narration to add the scope that right requires defined.

Claims (5)

1, a compressor that is used for compressing refrigerant has comprised: a shell (10), one electric motor (30) is fixed on the inwall (12) of above-mentioned shell (10), one bent axle (34) rotatably is connected on the said motor (30) in above-mentioned shell (10), one cylinder (37) is positioned at above-mentioned shell (10), and be connected its inwall, one pressure chamber (55) is arranged in said cylinder (37), one piston (52,54) device is operatively coupled on the above-mentioned bent axle at above-mentioned indoor compression refrigerant, tapping equipment (76) in the said cylinder (37) has linking of operation with above-mentioned chamber (55), the refrigerant that has compressed in order to discharge, an opening (90) is being communicated with above-mentioned pressure chamber in the said cylinder wall, the end (100) that it is characterized in that suction pipe (24) puts in the above-mentioned shell (10), above-mentioned pipe is connected hermetically that above-mentioned shell (10) is gone up and above-mentioned end (100) is to be slidably mounted in the above-mentioned opening (90), and flexible seal device (104) is put into and is used between above-mentioned opening (90) wall and the tube wall above-mentioned tube end (100) is sealed on the said cylinder (37).

2, the compressor of claim 1 is characterized in that round the thickness of said cylinder opening sealants be to be no less than 30,007 a thousandths

3, the compressor of claim 1 is characterized in that above-mentioned suction pipe end (100) can axially slide in the said cylinder opening (90), and above-mentioned seal arrangement has comprised an O shape ring (104) that is made of the oil resistant flexible material.

4, the compressor in the claim 1, it is characterized in that having a suction attachment device (106) as suction pipe is fixed on the cylinder baffle (10), above-mentioned piecing devices have comprised that a cylindrical chimb assembly installs above-mentioned pipe ordinatedly, above-mentioned joint have one be fixed on above-mentioned pipe first partly and one away from above-mentioned pipe second partly, above-mentioned second part is contacting above-mentioned shell (10).

5, the compressor of claim 1 it is characterized in that above-mentioned casing wall (12) is to move with respect to said cylinder (37), and above-mentioned suction pipe end (100) is to be received in slidably in the above-mentioned opening (90).

Images