CN206860663U - The crankshaft eccentric set and compression mechanism, reciprocating compressor of reciprocating compressor - Google Patents

Abstract

The utility model discloses a kind of crankshaft eccentric of twin compressor set and compression mechanism, reciprocating compressor.The compression mechanism of reciprocating compressor has crankshaft-and-connecting-rod, bent axle has eccentric part, the both ends of connecting rod are respectively bent axle connecting portion and Piston connecting portion, it is enclosed on outside bent axle connecting portion on eccentric part, crankshaft eccentric set is suitable to be set between bent axle connecting portion and eccentric part, has offset between the internal perisporium and periphery wall of crankshaft eccentric set.According to the crankshaft eccentric set of the utility model embodiment, it is installed between the connecting rod of reciprocating compressor and the eccentric part of bent axle, thus it is possible to vary the piston stroke of compressor, so as to reach the purpose for the minimum cylinder volume for changing compressor.

Description

The crankshaft eccentric set and compression mechanism, reciprocating compressor of reciprocating compressor

Technical field

It the utility model is related to compressor field, more particularly to the crankshaft eccentric set and compressor of a kind of reciprocating compressor Structure, reciprocating compressor.

Background technology

Such as development of household electric refrigerator, room air conditioner small-type refrigeration appliance, it is to weigh a national national economy to build If, science and technology and living standards of the people mark.Nearly ten years, with the development in an all-round way of economic construction of China, people's people's livelihood The flat continuous improvement of running water and the introduction of advanced technology, the exploitation of novel reciprocating type refrigeration compressor product, turn into major enterprise Industry seizes freezer compressor market, lifts the Main Means of product competitiveness in the market.But totally-enclosed reciprocating type refrigeration compressor The optimization that the development of industry is constantly in existing product improves the stage, and the overall structure type of product is in solid state, It is badly in need of a kind of new totally-enclosed reciprocating type refrigeration compressor in market to exploit market, expands refrigeration compressor market product Diversification.

Utility model content

The utility model is intended at least solve one of technical problem present in prior art.Therefore, the utility model carries Go out a kind of crankshaft eccentric set of reciprocating compressor, the crankshaft eccentric set be installed at reciprocating compressor crankshaft-and-connecting-rod it Between can change the compression volume of compressor.

The utility model, which also resides in, proposes a kind of compression mechanism with above-mentioned crankshaft eccentric set.

The utility model, which also resides in, proposes a kind of reciprocating compressor with compression mechanism.

According to the crankshaft eccentric set of the reciprocating compressor of the utility model embodiment, the compression of the reciprocating compressor Mechanism has crankshaft-and-connecting-rod, and the bent axle has eccentric part, and the both ends of the connecting rod are respectively that bent axle connecting portion and piston connect Socket part, the bent axle connecting portion are enclosed on the eccentric part outside, and the crankshaft eccentric set is suitable to be set in the bent axle connecting portion Between the eccentric part, there is offset between the internal perisporium and periphery wall of the crankshaft eccentric set.

According to the crankshaft eccentric set of the reciprocating compressor of the utility model embodiment, reciprocating compressor is installed at Connecting rod and bent axle eccentric part between, the position that can be enclosed on by changing crankshaft eccentric on bent axle, realize and change compressor Piston stroke, so as to reach change compressor minimum cylinder volume purpose.

In certain embodiments, the internal perisporium of the crankshaft eccentric set is provided with breach, the week of part where the breach The remainder of the crankshaft eccentric set is axle sleeve boss upwards.

Specifically, the two lateral walls of the breach in the circumferential correspond to the thickness maximum of the crankshaft eccentric set respectively And set at thickness minimum.

Optionally, the breach penetrates the crankshaft eccentric set on the thickness direction that the crankshaft eccentric covers.

Optionally, the breach penetrates the crankshaft eccentric on the direction of the end face covered towards the crankshaft eccentric Set.

In certain embodiments, the radius of the internal perisporium of the axle sleeve boss is more than the internal perisporium half of remainder Footpath；And/or the radius of the periphery wall of the axle sleeve boss is less than the periphery wall radius of remainder.Thus, to crankshaft eccentric During set is finished, without the internal perisporium to axle sleeve boss and/or outside when can use and not be in the mood for grinding process, and process Perisporium is processed, and reduces the area of finishing.In addition, such axle sleeve boss mechanism can also reduce crankshaft operation process Eccentric part and crankshaft eccentric set, the crankshaft eccentric of middle bent axle cover the friction loss between connecting rod.

In certain embodiments, the central angle of the axle sleeve boss is less than 180 degree and more than 135 degree.

In certain embodiments, the crankshaft eccentric is put provided with the axle sleeve oilhole penetrated in a thickness direction.Pressure In contracting mechanism running, lubricating oil warp beam is cased with hole into crankshaft eccentric set with the fit clearance of connecting rod, serving lubrication Effect.

According to the compression mechanism of the reciprocating compressor of the utility model embodiment, including according to the above-mentioned reality of the utility model Apply the crankshaft eccentric set of the reciprocating compressor of example.

According to the compression mechanism of the reciprocating compressor of the utility model embodiment, can be enclosed on by changing crankshaft eccentric Position on bent axle, the piston stroke for changing compressor is realized, so as to reach the purpose for the minimum cylinder volume for changing compressor.

According to the reciprocating compressor of the utility model embodiment, including according to the reciprocal of the utility model above-described embodiment The compression mechanism of formula compressor.

According to the reciprocating compressor of the utility model embodiment, compressor work can be changed by way of bent axle rotating The stroke of plug, it is possible to achieve the effect of two kinds of volume refrigerating capacity compressors of compressor.

Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description In become obvious, or by it is of the present utility model practice recognize.

Brief description of the drawings

Of the present utility model above-mentioned and/or additional aspect and advantage will in the description from combination accompanying drawings below to embodiment Become obvious and be readily appreciated that, wherein：

Fig. 1 is the explosive view of the compression mechanism of the utility model embodiment.

Fig. 2 is the structure chart of the crankcase of the utility model embodiment.

Fig. 3 is the structure chart of the connecting rod of the utility model embodiment.

Fig. 4 is the explosive view of the component home of the compression mechanism of the utility model embodiment.

Fig. 5 is the structure chart of the crankshaft eccentric set of the utility model embodiment.

Fig. 6 is the utility model embodiment when bent axle rotates forward schematic diagram when piston is in top dead centre.

Fig. 7 is the utility model embodiment when bent axle rotates forward schematic diagram when piston is in lower dead center.

Fig. 8 is the schematic diagram when bent axle reversion piston is in top dead centre of the utility model embodiment.

Fig. 9 is the schematic diagram when bent axle reversion piston is in lower dead center of the utility model embodiment.

Figure 10 is the three-dimensional structure diagram of the crankshaft eccentric set of the utility model embodiment.

Reference：

Compression mechanism 100,

Crankcase 1, bent axle axis hole 11, piston cylinder holes 12,

Bent axle 2, eccentric part 21, cam pin axis hole 22, mating holes 23, balance portion 24,

Connecting rod 3, bent axle connecting portion 31, Piston connecting portion 32,

Piston 4, piston pin 41,

Crankshaft eccentric set 5, breach 51, axle sleeve boss 52, the first face 521, the second face 522, axle sleeve oilhole 53,

Eccentric pivot pin 6, resilient key 7.

Embodiment

Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the utility model, and it is not intended that to of the present utility model Limitation.

Below with reference to Fig. 1-10 descriptions 5 are covered according to the crankshaft eccentric of the utility model embodiment.

The crankshaft eccentric set 5 of the utility model embodiment, is a part on reciprocating compressor.It is as shown in figure 1, past The compression mechanism 100 of twin compressor has bent axle 2 and connecting rod 3, and bent axle 2 has eccentric part 21, and the both ends of connecting rod 3 are respectively song Axis connection portion 31 and Piston connecting portion 32, bent axle connecting portion 31 are enclosed on eccentric part 21 outside.

According to the crankshaft eccentric of the utility model embodiment set 5 be suitable to be set in bent axle connecting portion 31 and eccentric part 21 it Between, there is offset between the internal perisporium and periphery wall of crankshaft eccentric set 5.

It is understood that as shown in figure 1, in compression mechanism 100, compression mechanism 100 also includes piston 4.Compressor Structure 100 is when being compressed, and by the drivening rod 3 of bent axle 2, connecting rod 3 moves up and down with piston 4 realizes that refrigerant compresses.Therefore it is living The stroke of plug 4 is determined by crankshaft eccentric amount.The utility model embodiment is provided between connecting rod 3 and the eccentric part 21 of bent axle 2 Crankshaft eccentric set 5, because crankshaft eccentric set 5 also has certain offset, thus now the stroke of piston 4 by crankshaft eccentric Amount and the stack result of the offset of crankshaft eccentric set 5 determine.Thus, in the compression mechanism 100 of reciprocating compressor, set The crankshaft eccentric set 5 of the utility model embodiment, the stroke of piston 4 of compressor can be changed.

5 are covered according to the crankshaft eccentric of the utility model embodiment, is installed at the connecting rod 3 and bent axle of reciprocating compressor Between 2 eccentric part 21, thus it is possible to vary the stroke of piston 4 of compressor, so as to change the minimum cylinder volume of compressor.

In certain embodiments, as shown in Figure 10, the internal perisporium of crankshaft eccentric set 5 is provided with breach 51, the place of breach 51 The remainder of crankshaft eccentric set 5 is axle sleeve boss 52 in partial circumference.

In some embodiments, the radius of the internal perisporium of axle sleeve boss 52 is more than the internal perisporium radius of remainder；Some realities Apply in example, the radius of the periphery wall of axle sleeve boss 52 is less than the periphery wall radius of remainder；In some embodiments, axle sleeve boss The radius of 52 internal perisporium is more than the internal perisporium radius of remainder, and the radius of the periphery wall of axle sleeve boss 52 is less than its remaining part The periphery wall radius divided.Thus, during being finished to crankshaft eccentric set 5, it can use and not be in the mood for grinding process, and add Man-hour is without the internal perisporium to axle sleeve boss 52 and/or is processed, and reduces the area of finishing.In addition, such axle sleeve Boss 52 can also reduce the eccentric part 21 of bent axle 2 and crankshaft eccentric set 5, crankshaft eccentric set 5 and connecting rod in the operation process of bent axle 2 Friction loss between 3.

In certain embodiments, crankshaft eccentric set 5 is integrally formed into big circular ring type, overall easy to process.

In some optional embodiments, the central angle of axle sleeve boss 52 is less than 180 degree and more than 135 degree.

It is understood that axle sleeve boss 52 be present on crankshaft eccentric set 5, crankshaft eccentric set 5 and bent axle 2 can be facilitated Connection, and coordinate special bent axle closing component structure, compression mechanism 100 can realize that same device has two kinds of minimum cylinder volumes. Its specific action principle illustrates the structure for combining compression mechanism 100 that to be described in detail some other features of crankshaft eccentric set 5 also will Hereinafter design is related to, and repeats no more here.

Certainly, the crankshaft eccentric set 5 of the utility model embodiment, can also be fixed on bent axle 2, no by other means It is limited to bent axle closing component structure.For example, crankshaft eccentric can be covered to 5 welding, be riveted on bent axle 2.

, can be by same when being produced using same complete equipment, same group of machined parameters with a collection of compression mechanism parts The manufacturing procedure of sample assembles the compression mechanism of different compression volumes.Dress is differed only between the compression mechanism of different capabilities Timing, fixed angle position of the crankshaft eccentric set 5 on bent axle 2 are different.Such design, it can be achieved with less design, add Work cost, complete the batch production of the different series of products of compression volume.

Compression mechanism 100 below with reference to Fig. 1-Figure 10 descriptions according to the utility model embodiment.

As shown in figure 1, according to the compression mechanism 100 of the utility model embodiment, including：Bent axle 2, connecting rod 3, piston 4, song Eccentric shaft set 5 and locking mechanism.

As shown in figure 4, bent axle 2 has eccentric part 21.The both ends of connecting rod 3 are respectively bent axle connecting portion 31 and Piston connecting portion 32, bent axle connecting portion 31 is enclosed on eccentric part 21 outside, and Piston connecting portion 32 is connected with piston 4.

As shown in figure 4, crankshaft eccentric set 5 is set between bent axle connecting portion 31 and eccentric part 21, crankshaft eccentric set 5 with partially Between center portion 21 for gap coordinate, crankshaft eccentric set 5 and bent axle connecting portion 31 between for gap coordinate, crankshaft eccentric set 5 it is interior There is offset between perisporium and periphery wall.

As shown in figure 4, bent axle closing component structure is located between crankshaft eccentric set 5 and bent axle 2, when the rotation direction of bent axle 2 is different When bent axle closing component structure crankshaft eccentric can be covered 5 and be locked at the Difference angles of bent axle 2 so that the stroke of piston 4 is different.

It is understood that due to coordinating between crankshaft eccentric set 5 and bent axle connecting portion 31 for gap, therefore work as bent axle 2 During rotation, when bent axle closing component structure does not lock together crankshaft eccentric set 5 and bent axle 2, effect of the crankshaft eccentric set 5 in frictional force The rotation axis that bent axle 2 can be surrounded down rotates.

When bent axle 2 is rotated in a first direction, for crankshaft eccentric set 5 after bent axle 2 rotates the first set angle, triggering is bent Axle closing component structure, so as to be locked in the first angle opening position of bent axle 2.Afterwards, bent axle 2 continues to rotate, now crankshaft eccentric Set 5 has been locked together on bent axle 2, crankshaft eccentric set 5 and the synchronous axial system of bent axle 2.Thus, bent axle 2 rotates drivening rod 3, connecting rod 3 Driving piston 4 moves up and down, and stroke is the first stroke.

When bent axle 2 rotates in a second direction, after crankshaft eccentric set 5 rotates the second set angle with bent axle 2, trigger again Bent axle closing component structure, so as to be locked in the second angle opening position of bent axle 2, afterwards, bent axle 2 continues to rotate, and now bent axle is inclined Heart set 5 has been locked together on bent axle 2, crankshaft eccentric set 5 and the synchronous axial system of bent axle 2.Thus, bent axle 2 rotates drivening rod 3, even Bar 3 drives piston 4 to move up and down, and stroke is the second stroke.

It should be noted that the offset of eccentric part 21 and the bias of crankshaft eccentric set 5 of the stroke of piston 4 by bent axle 2 Amount superposition determines.Therefore, if crankshaft eccentric is covered 5 sealed first angle positions, second angle position by bent axle closing component structure Difference is put, offset and the stack result between the offset of crankshaft eccentric set 5 of the eccentric part 21 of above-mentioned bent axle 2 can be different, Then the stroke of piston 4 also will not be identical.

According to the compression mechanism 100 of the utility model embodiment, by setting crankshaft eccentric set 5 and bent axle closing component structure, Bent axle closing component structure can cover crankshaft eccentric 5 Difference angles for being locked at bent axle 2 when 2 rotation direction difference of bent axle can be achieved Place, the offset result difference for making crankshaft eccentric set 5 be superimposed upon on the eccentric part 21 of bent axle 2, so that the stroke of piston 4 is not Together, and then the decrement of compression mechanism changes, so as to reach the purpose for realizing that compression mechanism has double refrigerating capacitys.

For convenience of description, the first direction that bent axle 2 rotates in description is referred to as positive, and second direction is reverse.

In certain embodiments, as shown in figure 5, the internal perisporium of crankshaft eccentric set 5 is provided with breach 51, crankshaft eccentric set 5 Axle sleeve boss 52 is formed in the remainder corresponding to breach 51 in circumference.

Bent axle closing component structure includes coordinating the eccentric pivot pin 6 in breach 51, the eccentric shaft in 2 two kinds of rotation directions of bent axle Pin 6 only can be against in the two lateral walls of breach 51 in the circumferential respectively.

It is understood that eccentric pivot pin 6 is connected with bent axle 2, when bent axle 2 rotates, eccentric pivot pin 6 can be with bent axle 2 rotations, after rotating to an angle, eccentric pivot pin 6 can be only against on the axle sleeve boss 52 of crankshaft eccentric set 5, complete eccentric shaft Pin 6 is sealed with bent axle 2.It is this limit it is sealed when crankshaft eccentric cover 5 angle position on bent axle 2, structure is very simple, hold Easy processing.

From describing above, when bent axle 2 is along when rotating forward, crankshaft eccentric set 5 is locked in the first angle of bent axle 2 Opening position, i.e. bent axle closing component structure and the sealed face of crankshaft eccentric set 5 are the first face 521；It is bent when bent axle 2 is along when reversely rotating Eccentric shaft set 5 is locked in the second angle opening position of bent axle 2, i.e. the sealed face of bent axle closing component structure and crankshaft eccentric set 5 is Second face 522.Thus, bent axle closing component structure is different from the sealed face of crankshaft eccentric set 5 so that when bent axle 2 rotates, and bent axle 2 is eccentric The offset in portion 21 is different from the stacked system of the offset of crankshaft eccentric set 5, i.e. the movement travel of piston 4 is different.

Specifically, breach 51 penetrates crankshaft eccentric set 5 on the thickness direction of crankshaft eccentric set 5, and breach 51 is bent in direction Crankshaft eccentric set 5 is penetrated on the direction of one end face of eccentric shaft set 5.So breach 51 is easily worked on crankshaft eccentric set 5.

Certainly, in other embodiment of the present utility model, breach 51 can also be formed as the internal perisporium of crankshaft eccentric set 5 On blind hole or perforation, be not restricted here.

Specifically, the two lateral walls of breach 51 in the circumferential correspond to the thickness maximum and thickness of crankshaft eccentric set 5 respectively Set at degree minimum, so, when crankshaft eccentric set 5 is locked together in first angle opening position and second angle opening position, bent axle Eccentric bushing 5 can cover the offset maximum being added on bent axle 2, so as to realize the compression mechanism 100 when 2 rotation direction difference of bent axle Volume change it is maximum.

Certainly, the position of breach 51 can be also adjusted in the utility model embodiment as needed, for example, can be in crankshaft eccentric Multiple breach 51 are set on set 5, can so when crankshaft eccentric set 5 is applied in the compression mechanism that different capabilities change needs Adjust the breach 51 that eccentric pivot pin 6 coordinates.

Further, eccentric pivot pin 6 is arranged on the pivot of bent axle 2 and the line at the center of eccentric part 21, so The offset of eccentric pivot pin 6 can be superimposed with the maximum eccentricity amount of bent axle 2, so as to obtain maximum stack result.

In certain embodiments, when eccentric pivot pin 6 is only against in the two lateral walls of breach 51 in the circumferential respectively, partially Mandrel pin 6 is 180 degree with respect to the rotational angle of the rotation axis of bent axle 2.It can so make full use of the circumference of crankshaft eccentric set 5 long Degree, to be laid out the thickness change of crankshaft eccentric set 5.

Alternatively, the radius of the internal perisporium of axle sleeve boss 52 is more than the internal perisporium radius of remainder；Axle sleeve boss 52 The radius of periphery wall is less than the periphery wall radius of remainder.Thus, during being finished to crankshaft eccentric set 5, Without being processed to the internal and external peripheral wall of axle sleeve boss 52 when can use and not be in the mood for grinding process, and process, reduce finishing Area.In addition, such axle sleeve boss 52 can also reduce the eccentric part 21 and crankshaft eccentric of bent axle 2 in the operation process of bent axle 2 Friction loss between set 5, crankshaft eccentric set 5 and the bent axle connecting portion 31 of connecting rod 3.

Alternatively, as shown in Figure 10, crankshaft eccentric set 5 is provided with the axle sleeve oilhole 53 penetrated in a thickness direction.Compression In the running of mechanism 100, lubricating oil warp beam sleeve oilhole 53 enters crankshaft eccentric set 5 with the fit clearance of connecting rod 3, serving Lubrication.

In certain embodiments, bent axle 2 is provided with eccentric pin hole 22, and the one end fits of eccentric pivot pin 6 are in eccentric pivot pin In hole 22.This socket connection mode, the separately machined of bent axle 2 and eccentric pivot pin 6 can be easy to, ensure the machining accuracy of the two.

In the utility model embodiment, the connected mode of eccentric pivot pin 6 and bent axle 2 have it is a variety of, for example, eccentric pivot pin 6 can To be fixed by welding on bent axle 2, or riveting is on bent axle 2.

In some optional embodiments, it is connected to a fixed between bent axle 2 and eccentric pivot pin 6 by connector.Such as connect Fitting is resilient key 7, using elastic pin connection, has good elasticity and anti-shearing force, connects reliable and stable.In another example partially Mandrel pin-and-hole 22 is formed as screwed hole, and eccentric pivot pin 6 is provided with screw thread, is connected through a screw thread eccentric pivot pin 6 being fixed on bent axle 2 On, i.e., a part for eccentric pivot pin 6 is formed as threaded connector.

In certain embodiments, eccentric pivot pin 6 is located at the side in the balance portion 24 of the remote bent axle 2 of crankshaft eccentric set 5.This Sample, eccentric pivot pin 6 have been stuck in the balance portion 24 of bent axle 2 equivalent to by crankshaft eccentric set 5, improve connection reliability.

Certainly, in the utility model embodiment, bent axle closing component structure can be not limited to said structure, for example, can balance Being covered towards crankshaft eccentric for portion 24 sets chute on 5 end face, then sets traveller on the opposing end surface of crankshaft eccentric set 5, Chute can cover track setting when 5 relative bent axles 2 rotate according to crankshaft eccentric, while chute has two extreme positions, works as song First angle opening position is locked together in by traveller when eccentric shaft set 5 turns to an extreme position, when crankshaft eccentric set 5 turns to separately Second angle opening position is locked together in by traveller during one extreme position.

The compression mechanism 100 of one specific embodiment of the utility model is described below with reference to Fig. 1-Figure 10.

Compression mechanism 100 in the present embodiment is by crankcase 1, bent axle 2, crankshaft eccentric set 5, connecting rod 3, resilient key 7, bias Pivot pin 6, piston pin 41 and piston 4 form.

As Figure 1-Figure 2, crankcase 1 is provided with bent axle axis hole 11 and piston cylinder holes 12, and bent axle 2 and bent axle axis hole 11 are same Axle and gap cooperation, the use gap fiting mode of piston 4 are fitted into piston cylinder holes 12, the bias of crankshaft eccentric set 5 and bent axle 2 Portion 21 is coaxially assembled, and fit clearance between crankshaft eccentric set 5 and the eccentric part 21 of bent axle 2 be present, crankshaft eccentric set 5 can be around bent axle 2 eccentric part 21 is rotated, while crankshaft eccentric set 5 rotates with rotation axis of the bent axle 2 around bent axle 2, and crankshaft eccentric set 5 is provided with The annulus of decentraction, it is S0 that crankshaft eccentric, which covers 5 inner circles with respect to excircle eccentricity amount,.

As shown in Figure 1, Figure 3, the bent axle connecting portion 31 of connecting rod 3 and crankshaft eccentric set 5 is coaxially disposed, bent axle connecting portion 31 with Coordinated between crankshaft eccentric set 5 using gap.Eccentric part 21, the crankshaft eccentric of bent axle 2 cover the bent axle connecting portion 31 of 5 and connecting rod 3 Between can around bent axle 2 the axis of eccentric part 21 rotate.

As Figure 1 and Figure 4, bent axle 2 is provided with eccentric pin hole 22, after the completion of crankshaft eccentric set 5 assembles with connecting rod 3, Eccentric pivot pin 6 inserts eccentric pin hole 22, and resilient key 7 inserts the hole of resilient key 7 and the mating holes 23 on eccentric pivot pin 6, by bias Pivot pin 6 is fixed on bent axle 2, and eccentric pivot pin 6 can rotate with bent axle 2.

Piston 4 turns to match somebody with somebody with the gap of piston cylinder holes 12, and the Piston connecting portion 32 on connecting rod 3 inserts the middle part of piston 4, living Piston 4 is connected by plug pin 41 through piston 4 with Piston connecting portion 32 with connecting rod 3.

The compression mechanism 100 of the present embodiment, change the stroke of piston 4 by way of the rotating of bent axle 2 to realize one Compression mechanism has the effect of two kinds of volume refrigerating capacity compressors.

When bent axle 2 rotates forward, eccentric pivot pin 6 is driven to rotate forward, crankshaft eccentric set 5 is by the rubbing action of bent axle 2 along the inclined of bent axle 2 The axis of center portion 21 rotates, as shown in fig. 6, when piston 4 runs to top dead centre, the first face of eccentric pivot pin 6 and axle sleeve boss 52 521 connect and lock crankshaft eccentric set 5, and now, the distance between the end face of piston 4 and the end face of crankcase 1 are L1, and piston 4 is upper During stop in recessed piston cylinder holes 12, as shown in fig. 7, when piston 4 is in lower dead center between the end face of piston 4 and the end face of crankcase 1 Distance be L2, now the stroke of piston 4 covers twice of sum of 5 offsets for twice of the offset of bent axle 2 with crankshaft eccentric.

When bent axle 2 inverts, eccentric pivot pin 6 is driven to invert, crankshaft eccentric set 5 is by the rubbing action of bent axle 2 along the inclined of bent axle 2 The axis of center portion 21 rotates, as shown in figure 8, when piston 4 runs to top dead centre, the second face of eccentric pivot pin 6 and axle sleeve boss 52 522 connect and lock crankshaft eccentric set 5, and the distance between the end face of piston 4 and the end face of crankcase 1 are L3, and piston 4 is in top dead centre Protrude in piston cylinder holes 12, as shown in figure 9, when piston 4 is in lower dead center, the distance between the end face of piston 4 and the end face of crankcase 1 For L4, now the stroke of piston 4 is 2 offset of bent axle twice and crankshaft eccentric covers twice of difference of 5 offsets.

Compression mechanism 100 in the present embodiment covers 5 lockings by eccentric pivot pin 6 to crankshaft eccentric, changes the stroke of piston 4, So that the stroke difference of 2 rotating piston of bent axle 4 is four times that crankshaft eccentric covers 5 offsets, realize that compression process discharge refrigerant holds Long-pending change.

According to the reciprocating compressor of the utility model embodiment, including according to the utility model above-described embodiment The compression mechanism 100 of reciprocating compressor.

Thus, the stroke of compressor piston is changed by way of prime mover rotating, it is possible to achieve a compressor two The effect of kind volume refrigerating capacity compressor.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe Structure, material or feature are contained at least one embodiment or example of the present utility model.In this manual, to above-mentioned art The schematic representation of language is not necessarily referring to identical embodiment or example.Moreover, description specific features, structure, material or Person's feature can combine in an appropriate manner in any one or more embodiments or example.

While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that： These embodiments can be carried out with a variety of changes, modification in the case where not departing from principle and objective of the present utility model, replaced And modification, the scope of the utility model are limited by claim and its equivalent.

Claims (10)

1. a kind of crankshaft eccentric set of reciprocating compressor, the compression mechanism of the reciprocating compressor have crankshaft-and-connecting-rod, The bent axle has an eccentric part, and the both ends of the connecting rod are respectively bent axle connecting portion and Piston connecting portion, the bent axle connecting portion Be enclosed on outside on the eccentric part, it is characterised in that crankshaft eccentric set be suitable to be set in the bent axle connecting portion and it is described partially Between center portion, there is offset between the internal perisporium and periphery wall of the crankshaft eccentric set.

2. the crankshaft eccentric set of reciprocating compressor according to claim 1, it is characterised in that the crankshaft eccentric set Internal perisporium is provided with breach, and the remainder of the crankshaft eccentric set is axle sleeve boss in the circumference of part where the breach.

3. the crankshaft eccentric set of reciprocating compressor according to claim 2, it is characterised in that the breach is in the circumferential Two lateral walls correspond to thickness maximum and the minimum place's setting of thickness of crankshaft eccentric set respectively.

4. the crankshaft eccentric set of reciprocating compressor according to claim 2, it is characterised in that the breach is in the song The crankshaft eccentric set is penetrated on the thickness direction of eccentric shaft set.

5. the crankshaft eccentric set of the reciprocating compressor according to claim 2 or 3, it is characterised in that the breach exists The crankshaft eccentric set is penetrated on towards the direction of an end face of crankshaft eccentric set.

6. the crankshaft eccentric set of reciprocating compressor according to claim 2, it is characterised in that the axle sleeve boss it is interior The radius of perisporium is more than the internal perisporium radius of remainder；And/or the radius of the periphery wall of the axle sleeve boss is less than its remaining part The periphery wall radius divided.

7. the crankshaft eccentric set of reciprocating compressor according to claim 2, it is characterised in that the circle of the axle sleeve boss Heart angle is less than 180 degree and more than 135 degree.

8. the crankshaft eccentric set of reciprocating compressor according to claim 1, it is characterised in that the crankshaft eccentric is put Provided with the axle sleeve oilhole penetrated in a thickness direction.

9. a kind of compression mechanism of reciprocating compressor, it is characterised in that including according to any one of claim 1-8 The crankshaft eccentric set of reciprocating compressor.

10. a kind of reciprocating compressor, it is characterised in that include the compression of reciprocating compressor according to claim 9 Mechanism.