CN201757059U

CN201757059U - Compressor

Info

Publication number: CN201757059U
Application number: CN2010202131495U
Authority: CN
Inventors: 林晓东; 蒋雄; 金林
Original assignee: Panasonic Wanbao Appliances Compressor Guangzhou Co Ltd
Current assignee: Panasonic Wanbao Appliances Compressor Guangzhou Co Ltd
Priority date: 2010-05-24
Filing date: 2010-05-24
Publication date: 2011-03-09
Anticipated expiration: 2020-05-24

Abstract

The utility model discloses a compressor, belonging to a compressor technical field, which includes a housing, and a pump body member and a motor member which are disposed in the housing; the pump body member includes a crankshaft, an air cylinder, a piston, a slide block, an upper bearing and a lower bearing; an annular groove is disposed on the lower end surface of the piston; an opening small groove is disposed on the upper end surface of the lower bearing; an opening end of the annular groove and the opening end of the opening small groove are partly superposed and communicated; a distance between the opening small groove and the farthest position of the piston center is greater than the size of the outer diameter of the piston; the distance between the opening small groove and the nearest position of the piston center is greater than the size of the inner diameter of the piston; the opening small groove is disposed in a range between a starting compression angle of the air cylinder and a stopping exhaust angle of the air cylinder. The compressor effectively improves an unbalanced force of upper and lower end surfaces of the piston and reduces wearing of contacted end surfaces of the piston and upper and lower bearings in the condition of ensuring sealing performance of the pump body member of the compressor, thereby reducing friction power loss of the pump body, saving energy and improving the compression efficiency of the compressor.

Description

A kind of compressor

Technical field

The utility model belongs to the Compressor Technology field, specifically is a kind of rotary compressor.

Background technique

In the prior art, rotary compressor comprises housing, place pump assembly and electric machine assembly in the housing, pump assembly comprises bent axle, cylinder, can be in the cylinder around the piston of crankshaft rotating, slide block, and corresponding to the upper bearing (metal) and the lower bearing of cylinder upper and lower end face, upper bearing (metal), cylinder, piston, slide block, lower bearing forms the swept volume of cylinder, the driven by motor bent axle rotates together with piston, in the piston rotary course, slide block is separated into compression chamber and air aspiration cavity with the volume of cylinder of cylinder and piston space, the continuous rotation of piston forms in the cylinder air-breathing, compression, compression such as exhaust circulation becomes high temperature and high pressure gas with the gas compression with low-pressure low-temperature.

Rotary compressor is when load operation, piston end face plays the effect of sealing, form sealing plane between the upper and lower end face of piston and the metal (upper with certain interval, during piston operation, piston up and down both ends of the surface has a spot of refrigerator oil and enters, form the pressure oil film and fill packed-piston and the end clearance of metal (upper, because of the piston of rotary compressor pump assembly is that level is to the structural feature that rotatablely moves, in operation process, because the deadweight of piston, piston axially can produce thrust, in traditional pump assembly, piston and metal (upper are gap sealed, and the gap can not be too little, because the existence of piston end thrust, if the gap is too little, will certainly destroy the oil film of piston end surface, make piston end surface or metal (upper end under no oil condition, to come in contact, thereby the friction power loss of compression assembly is increased, can produce abrasion under the abominable situation; In addition, the gap between the end face of piston upper and lower end face and metal (upper can not be too big, and the gap makes piston can't form sealing too greatly, can produce leakage, poor sealing performance.

Usually, for the generation that prevents to wear away, general design is the gap between oversize piston and metal (upper suitably all, thus can be suitable reduce friction power loss, but will sacrifice the efficient of part pump assembly compression like this.In order to solve aforesaid problem, the patent No. is 01144293.X, and notification number is CN 1427163A, and the model utility name is called a kind of structure of loading about the reduction of compressor, and the structure that this compressor reduces load comprises rolling piston, main bearing and auxilliary bearing.At rolling piston, main bearing and auxilliary bearing are provided with groove, in the middle of it is in contact with one another face, have at least one side fluted, thereby minimizing area of contact, the rolling piston that is in contact with one another when making compression refrigerant, the area of contact of main bearing and auxilliary bearing diminishes, reduce the friction power loss of piston by the minimizing of piston end surface area, the area of piston end surface reduces the power consumption of can reducing friction in theory, but during actual the use, because the minimizing of piston end area, the pressure that causes piston end surface unit's stress surface to bear becomes big, be that partial surface is pressed increase, thereby reduced the reliability of piston, piston reduces poor practicability working life.

The model utility content

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of compressor is provided, this compressor has improved the unbalanced force of piston upper and lower end face effectively, the wearing and tearing of the end face of piston and metal (upper contact under the situation of guaranteeing the sealability of compressor pump assembly own, have been reduced, thereby reduce the friction power loss of the pump housing, the compression efficiency of energy-saving consumption-reducing, raising compressor.

In order to realize above-mentioned technical purpose, the utility model is realized by following technological scheme:

A kind of compressor described in the utility model, comprise housing, place housing inner pump assembly and electric machine assembly, described pump assembly comprises bent axle, cylinder, be provided with piston in the cylinder around crankshaft rotating, slide block, and corresponding to the upper bearing (metal) and the lower bearing of cylinder upper and lower end face, slide block places in the slide block slot set in the cylinder, the lower end surface of described piston is provided with annular groove, offer the opening sulculus on the upper-end surface of described lower bearing, the opening end of described annular groove overlaps with the open end portion of opening sulculus and is communicated with, distance between described opening sulculus and the piston center highest distance position is greater than the outside dimension of piston, distance between described opening sulculus and the piston center proximal most position is greater than the internal diameter size of piston, the setting of described opening sulculus begins compression angle in angular range between the cylinder termination exhaust angle corresponding to cylinder, be β＜θ＜α, wherein α is slide block slot center and the cylinder angle between the position when beginning to compress, β is the angle of the opening end of slide block slot center and the close slide block slot of cylinder exhaust port, and θ is the position angle of opening sulculus with respect to the slide block slot center.

Further improvement as above-mentioned technology, the width D 1 of the annular groove of described piston bottom end face is 1/3～1/2 of a piston width, wherein D1 is the internal diameter limit of annular groove and the distance between the annular groove outer diameter side, and piston width is the distance between piston inner diameter limit and the piston external diameter limit.

In the utility model, the wedge groove that is shaped as regular shape of described opening sulculus, opening arc groove, square opening groove, certainly, it can also be other any erose opening sulculuses.

Compared with prior art, the beneficial effects of the utility model are:

(1) the utility model is because the partially overlapping and be communicated with of annular groove and opening sulculus, and opening sulculus angular orientation is that correspondence is arranged on cylinder and begins compression position to the scope between the position that the cylinder exhaust finishes, make the pressurized gas refrigerant in the compression chamber when being in compression process and exhaust process in the cylinder enter the lower end surface of piston by opening sulculus and annular groove like this, because the importing of pressurized gas refrigerant, piston is in operation process, can be subjected to an active force vertically upward, the upper and lower end face of piston is all stressed, but since the existence of piston bottom surface spill annular groove, increased the suffered active force that makes progress of piston, overcome or partly overcome the gravity of downward active force of piston and piston self, thereby make piston floating, because piston is floating, side face of piston ring has just reduced with the frictional force that upper bearing (metal) contacts with lower bearing, side face of piston ring and upper bearing (metal) like this, the frictional loss between the lower bearing just can reduce, with the purpose that realizes that mechanical loss reduces;

(2) annular groove of the present utility model is guaranteeing to be communicated with preferably effect with the opening sulculus, entering annular groove for pressurized gas refrigerant (or high pressure oil) makes under the floating situation of piston, the size of opening sulculus is accomplished littler as far as possible, do not influence the sealability of compressor, guarantee compressor pump assembly compression efficiency preferably; In addition, the width of annular groove can increase under the situation that concrete structure allows as far as possible, and its degree of depth can be deepened under the situation that structure allows as far as possible.

Description of drawings

Fig. 1 is the utility model compressor arrangement schematic representation;

Fig. 2 is the utility model middle pump body modular construction schematic representation;

Fig. 3 is the local enlarged diagram in A place among Fig. 2;

Fig. 4 is a piston structure schematic representation in the utility model;

Fig. 5 is a lower bearing structural representation in the utility model;

Fig. 6 is the plan view of above-mentioned Fig. 5;

Fig. 7 is the structural representation of the corresponding cylinder location of lower bearing upper shed sulculus of the present utility model;

Fig. 8 is the structural representation of lower bearing opening sulculus of the present utility model and piston ring connected in star correspondence;

Fig. 9 is the B place partial structurtes enlarged diagram of above-mentioned Fig. 8;

Figure 10 is a force analysis enlarged diagram of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in detail, it is to be noted that embodiment of the present utility model does not have the effect that limits scope of the present invention.

As shown in Figure 1 and Figure 2, a kind of compressor described in the utility model, comprise housing 1, place housing 1 inner pump assembly and electric machine assembly 2, described pump assembly comprises piston 5, the slide block 7 that is provided with in bent axle 6, cylinder 9, the cylinder 9 around bent axle 6 rotations, and corresponding to the upper bearing (metal) 3 and the lower bearing 4 of cylinder 9 upper and lower end faces, it adopts screw 8 to fit together the formation pump assembly together, slide block 7 places in the slide block slot 10 (as shown in Figure 7) set in the cylinder, and the bottom of lower bearing 4 also correspondence is provided with refrigerator oil 11.

As Fig. 3～shown in Figure 7, the lower end surface of piston 5 is provided with annular groove 51, offer opening sulculus 41 on the upper-end surface of lower bearing 4, the opening end of this annular groove 51 overlaps with the open end portion of opening sulculus 41 and is communicated with, distance between opening sulculus 41 and the piston 5 center hole highest distance positions is greater than the outside dimension of piston 5, and the distance between opening sulculus 41 and the piston 5 center hole proximal most position is greater than the internal diameter size of piston 5.In addition, as shown in Figure 7, opening sulculus 41 is located at cylinder and begins compression angle 15 in angular range between the cylinder termination exhaust angle 16, be β＜θ＜α, wherein α is that slide block slot 10 centers and cylinder begin the angle between compression angle 15 positions, β is the angle of the opening end of slide block slot 10 centers and cylinder exhaust port 14 close slide block slots 10, and θ is the position angle of opening sulculus with respect to the slide block slot center.(angular position theta of opening sulculus 41 as shown in Figure 7, the wherein position at 30 expression opening sulculuses, 41 places.)

In addition, as Fig. 9, shown in Figure 10, the width D 1 of the annular groove 51 of described piston bottom end face is 1/3～1/2 of a piston width, wherein D1 is the internal diameter limit 17 of annular groove and the distance between the annular groove outer diameter side 18, and piston width is the distance between piston inner diameter limit 19 and the piston external diameter limit 20.

Shape at the sulculus of opening described in the utility model 41 can be wedge groove, opening arc groove, the square opening groove of regular shape, also can be erose opening sulculus.

In the compressor operation process, by piston 5, upper bearing (metal) 3, be inclusive with pressurized gas refrigerant in the sealed volume that lower bearing 4 and cylinder 9 form, be Spielpassung between piston 5 and upper bearing (metal) 3 and the lower bearing 4, fitting surface is by the filling of refrigerator oil 11, and piston 5 is made circular movement in cylinder 9, and relative upper bearing (metal) 3 of the end face of piston 5 and lower bearing 4 have slide relative.

Implementation method of the present utility model is: during piston 5 work, carry out circular movement with respect to cylinder 9, because the existence of lower bearing 4 opening sulculuses 41 and piston 5 end ring connected in stars 51, when piston 5 turns over predefined angle, promptly begin compression position angle 15 in angular range the cylinder termination exhaust position angle 16 from cylinder, by piston 5, upper bearing (metal) 3, lower bearing 4, pressurized gas refrigerant 12 in the closed cavity that cylinder 9 is formed just can enter the lower end surface of piston 5 by opening sulculus 41 and annular groove 51, because the importing of pressurized gas refrigerant 12, piston 5 is in operation process, can be subjected to an active force vertically upward, as shown in figure 11, the upper and lower end face of piston 5 is all stressed, but because the existence of piston 5 end face spill annular grooves 51, the piston 5 suffered active forces that make progress have been increased, overcome or partly overcome the gravity of downward active force of piston and piston self, thereby make piston 5 floating, because piston 5 is floating, the frictional force that contacts between piston 5 both ends of the surface and upper bearing (metal) 3 and the lower bearing 4 just significantly reduces, like this piston 5 both ends of the surface and upper bearing (metal) 3, frictional loss between the lower bearing 4 just can reduce, with the purpose that realizes that mechanical loss reduces.

Below working principle of the present utility model is described in detail,

1, the illustrated principle of the utility model is will introduce in the annular groove 51 of lower end surface that pressurized gas enter piston 5, and the working procedure of cylinder comprises air-breathing, compression, exhaust, cylinder sucks low pressure refrigerant gas from cylinder inlet hole 13, bent axle 6 drives in the rotary course of piston 5, slide block 7 is separated into compression chamber and air aspiration cavity with cylinder, when piston continues rotation, the cylinder compression, exhaust, begin to compress in the process that exhaust stops at cylinder, the compression intracavity gas is in high pressure conditions always, when opening sulculus 41 is arranged on this zone corresponding to the position of cylinder, the interior pressurized gas of compression chamber this moment enter in the annular groove 51 by opening sulculus 41, like this, piston base is subjected to making progress, and active force overcomes or part overcomes the gravity of downward active force of piston and piston self, thereby makes piston floating.

Therefore, following condition must be satisfied in opening sulculus 41 angular orientations: when position angle 15 stopped exhaust to cylinder when promptly opening sulculus 41 was arranged on cylinder and begins to compress between the position angle 16 in the angular range, be β＜θ＜α, wherein α is slide block slot 10 centers and the cylinder angle between the position when beginning to compress, β is the angle of the opening end of slide block slot 10 centers and cylinder exhaust port 14 close slide block slots 10, and θ is the position angle of opening sulculus 41 with respect to slide block slot 10 centers.Only in this way, the gas that could guarantee to introduce piston ring connected in star 51 is pressurized gas.

2, the illustrated working principle of the utility model is except being will introduce in the annular groove 51 of lower end surface that pressurized gas enter piston 5, also must satisfy simultaneously, pressurized gas can not enter piston cavity by piston end surface, it is the condition that the end face of piston 5 must satisfy sealing, otherwise, high pressure air is known from experience the internal diameter that enters piston by the wedge groove, will leak like this; Sealability in order to ensure piston end surface, opening sulculus 41 (this wedge groove of sentencing symplex structure is that example is illustrated), the radius of wedge groove must satisfy in as described in Figure 9 the position range, as shown in Figure 9: the radius of establishing the wedge groove is r, the distance at wedge groove center and piston center is L, piston inner diameter is R, the width of piston is that the distance between piston inner diameter and the external diameter is made as D, then must satisfy following formula requires: L-r＞R, so just satisfy distance between wedge groove and the piston center proximal most position greater than the internal diameter size of piston, avoided pressurized gas to enter the internal diameter of piston by the wedge groove effectively; In addition, in the scope that guarantees θ angle corresponding in cylinder, the wedge groove can play the effect that imports pressurized gas, also must satisfy following formula and require: L+r＞R+D; Be that distance between wedge groove and the piston center highest distance position must be greater than the outside dimension of piston.Also promptly, the distance between opening sulculus 41 and the piston 5 center hole highest distance positions is greater than the outside dimension of piston 5, and the distance between opening sulculus 41 and the piston 5 center hole proximal most position is greater than the internal diameter size of piston 5.

In sum, the conditional relationship of aforesaid angle and size has been satisfied in opening sulculus 41 positions, spatially, just guaranteed the position of opening sulculus 41, thereby reach the friction power loss that has significantly reduced piston end surface under the condition that satisfies sealing, energy-saving consumption-reducing, compression efficiency improves.

The utility model is not limited to above-mentioned mode of execution, if various changes of the present utility model or modification are not broken away from spirit and scope of the present utility model, if these are changed and modification belongs within claim of the present utility model and the equivalent technologies scope, then the utility model also comprises these changes and modification.

Claims

1. compressor, comprise housing, place housing inner pump assembly and electric machine assembly, described pump assembly comprises bent axle, cylinder, be provided with piston in the cylinder around crankshaft rotating, slide block, and corresponding to the upper bearing (metal) and the lower bearing of cylinder upper and lower end face, slide block places in the slide block slot set in the cylinder, it is characterized in that: the lower end surface of described piston is provided with annular groove, offer the opening sulculus on the upper-end surface of described lower bearing, the opening end of described annular groove overlaps with the open end portion of opening sulculus and is communicated with, distance between described opening sulculus and the piston center highest distance position is greater than the outside dimension of piston, distance between described opening sulculus and the piston center proximal most position is greater than the internal diameter size of piston, described opening sulculus be arranged on corresponding to cylinder begin compression angle to cylinder stop the exhaust angle between on the position in the angular range.

2. compressor according to claim 1 is characterized in that: the width of the annular groove of described piston bottom end face is 1/3～1/2 of a piston width.

3. compressor according to claim 1 is characterized in that: described opening sulculus be shaped as wedge groove, opening arc groove, square opening groove.