CN204436740U - Compressor - Google Patents

Abstract

The utility model discloses a kind of compressor, comprising: housing; Compressing mechanism, compressing mechanism is located in housing, and compressing mechanism comprises main bearing, cylinder, supplementary bearing and bent axle, main bearing is located at the top of cylinder, supplementary bearing is located at the bottom of cylinder, and bent axle is located in main bearing, cylinder and supplementary bearing successively, and bent axle inside has center hole; Strut, the periphery wall of strut is provided with spiral groove, the stretching at least partially and be fixed in center hole of strut; Supporting base, supporting base is located at the lower end of supplementary bearing, and supporting base is configured to the gap that can enter into strut and center hole for the lubricant oil of housing bottom; And thrust piece, thrust piece is located at the lower end of strut, and bottom and the supporting base of thrust piece only support, and the contact center of thrust piece and supporting base is positioned on the gyration center line of bent axle.High according to the compressor reliability of the utility model embodiment, performance good.

Description

Compressor

Technical field

The utility model relates to Compressor Technology field, especially relates to a kind of compressor.

Background technique

Point out in correlation technique, the bent axle of compressor and rotor, owing to being subject to the effect of the various downward power such as gravity, downward electromagnet pull, finally can act on the lower thrust surface of bent axle.But lower thrust surface is eccentric design, and Point of Strength is not in center of gravity, turning radius is comparatively large, and is sliding friction, and lubrication effect is also undesirable, thus causing the frictional work of consumption more, compressor performance declines, and larger on the further raising impact of compressor performance.

Model utility content

The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the utility model needs to propose a kind of compressor, and this compressor reliability is high, performance good.

According to the compressor of the utility model embodiment, comprising: housing; Compressing mechanism, described compressing mechanism is located in described housing, described compressing mechanism comprises main bearing, cylinder, supplementary bearing and bent axle, described main bearing is located at the top of described cylinder, described supplementary bearing is located at the bottom of described cylinder, described bent axle is located in described main bearing, described cylinder and described supplementary bearing successively, and described bent axle inside has center hole; Strut, the periphery wall of described strut is provided with spiral groove, the stretching at least partially and be fixed in described center hole of described strut; Supporting base, described supporting base is located at the lower end of described supplementary bearing, and described supporting base is configured to the gap that can enter into described strut and described center hole for the lubricant oil of described housing bottom; And thrust piece, described thrust piece is located at the lower end of described strut, and bottom and the described supporting base of described thrust piece only support, and the contact center of described thrust piece and described supporting base is positioned on the gyration center line of described bent axle.

According to the compressor of the utility model embodiment, by arranging the strut with spiral groove in the lower end of bent axle, thus the spiral structure that oils can be adopted to ensure the lubrication of compressor, and the flow area of lubricant oil can be ensured, the performance of compressor can be improved thus.And by arranging the supporting base and thrust piece that mutually only support, thus compressor can be reduced largely and enter power, ensure the axle head intermediate support of compressor, and then the reliability of compressor can be improved, and structure is simple.

In addition, also following additional technical feature can be had according to compressor of the present utility model:

Described thrust piece is the oval ball of thrust ball or thrust, and the lower end of described strut is formed with thrust groove, being partially received in described thrust groove of described thrust piece.

Described thrust groove is projected as taper or circular arc in vertical plane.

Described thrust piece is the thrust body be formed in bottom described strut, and the bottom of described thrust body has plane or the downward arc surface protruded.

Be provided with thrust plate between described thrust piece and described supporting base, the hardness of described thrust plate is greater than the hardness of described supporting base.

Described strut is threaded with described center hole, interference connects, bonding or be welded to connect.

Described strut is formed with multiple described spiral groove, and the quantity of described spiral groove is 2 ~ 4.

The diameter of described center hole is D1, and the inscribed circle diameter of the external frame of the middle part entity structure horizontal projection of described strut is D2, and meets following relation: 1mm≤D2≤1/2*D1.

The diameter of described center hole is D1, and the overall dimensions of the transverse direction of described thrust piece is d, and meets following relation: 1mm≤d < D1.

The lower end of described strut exceedes the lower end of described bent axle downwards, and the distance between the lower end of described strut and the lower end of described bent axle is more than or equal to 2mm.

Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present utility model and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 is the partial structurtes sectional view of the compressor according to the utility model embodiment;

Fig. 2 is the partial structurtes sectional view of the compressing mechanism of compressor according to the utility model embodiment;

Fig. 3 is according to the structural representation of the strut of the compressing mechanism of the compressor of the utility model embodiment embodiment;

Fig. 4 is according to the structural representation of another embodiment of the strut of the compressing mechanism of the compressor of the utility model embodiment;

Fig. 5 is according to the structural representation of another embodiment of the strut of the compressing mechanism of the compressor of the utility model embodiment;

Fig. 6 is according to the plan view of the strut of the compressing mechanism of the compressor of the utility model embodiment.

Reference character:

Compressor 100;

Housing 1;

Compressing mechanism 2; Main bearing 21; Cylinder 22; Supplementary bearing 23; Bent axle 24; Center hole 241; Eccentric part 242;

Strut 3; Spiral groove 31; Thrust groove 32;

Supporting base 4; Inner chamber 41; Through hole 42;

Thrust piece 5; Thrust ball 51; Thrust body 52;

Motor 6; Stator 61; Rotor 62;

Piston 7; Slide plate 8; Thrust plate 9.

Embodiment

Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.

In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature immediately below second feature and tiltedly below, or only represent that fisrt feature level height is less than second feature.

Below with reference to Fig. 1-Fig. 6, the compressor 100 according to the utility model embodiment is described.Wherein, compressor 100 can be rotary compressor.In description below the application, be described for rotary compressor for compressor 100.Certainly, those skilled in the art are appreciated that compressor 100 can also be the compressor 100 of other type, and are not limited to rotary compressor.

As shown in figs 1 to 6, according to the compressor 100 of the utility model embodiment, comprising: housing 1, compressing mechanism 2, strut 3, supporting base 4 and thrust piece 5.

Housing 1 can vertically be arranged, and now the central axis of housing 1 vertically extends.Housing 1 is preferably rotary structure, to facilitate manufacturing.Compressor 100 such as rotary compressor also comprises motor 6, and motor 6 and compressing mechanism 2 are all located in housing 1, and motor 6 is positioned at the top of compressing mechanism 2, and motor 6 is connected to drive compressing mechanism 2 to compress the refrigerant entered in it with compressing mechanism 2.

Specifically, motor 6 comprises stator 61 and rotor 62, and such as, shown in Fig. 1, rotor 62 is coaxially located in stator 61 rotationally, and now motor 6 is inner rotor motor.Certainly, motor 6 can also be external rotor electric machine (scheming not shown).

Compressing mechanism 2 comprises main bearing 21, cylinder 22, supplementary bearing 23 and bent axle 24, main bearing 21 is located at the top of cylinder 22, supplementary bearing 23 is located at the bottom of cylinder 22, and bent axle 24 is located in main bearing 21, cylinder 22 and supplementary bearing 23 successively, and bent axle 24 inside has center hole 241.

Alternatively, can be single cylinder compressor 100 according to the compressor 100 of the utility model embodiment also can be multicylinder compressor 100.

When compressor 100 is single cylinder compressor 100, as shown in Figure 1, cylinder 22 comprises one, now compressing mechanism 2 comprises main bearing 21, an above-mentioned cylinder 22, supplementary bearing 23 and bent axle 24, wherein, main bearing 21 is located at the top of this cylinder 22, supplementary bearing 23 is located at the bottom of this cylinder 22, in cylinder 22, there is compression chamber, piston 7 is provided with in compression chamber, cylinder 22 is formed with radial extension and slide plate 8 groove be communicated with compression chamber, slide plate 8 is located in slide plate 8 groove movably, and the periphery wall of the inner of slide plate 8 and piston 7 only supports, the outer end of slide plate 8 is connected with spring.The upper end of bent axle 24 is connected with rotor 62, and the lower end of bent axle 24 runs through main bearing 21, cylinder 22 and supplementary bearing 23 downwards successively, and bent axle 24 has eccentric part 242, and eccentric part 242 is positioned at compression chamber, and piston 7 is set in outside eccentric part 242.When motor 6 works, rotor 62 is with dynamic crankshaft 24 wraparound to turn center line to rotate, thus drives and be set in the piston 7 on the eccentric part 242 of bent axle 24 and roll along the inwall of compression chamber.It should be noted that, " interior " can be understood as the direction towards cylinder axis, and its opposite direction is defined as " outward ", namely away from the direction of cylinder axis.

When compressor 100 is multicylinder compressor 100 such as duplex cylinder compressor 100, cylinder 22 comprises two that arrange in the vertical direction, all has compression chamber (scheming not shown) in each cylinder 22.Certainly, when compressor 100 more than compressor 100 is three cylinders or three cylinders, cylinder 22 comprises the cylinder 22 of more than three or three that arrange in the vertical direction.Be appreciated that other configuration example of multicylinder compressor 100 such as duplex cylinder compressor 100 grade is as roughly the same with single cylinder compressor 100 in main bearing 21, supplementary bearing 23 etc., do not repeat them here.

The periphery wall of strut 3 is provided with spiral groove 31, the stretching at least partially and be fixed in center hole 241 of strut 3.Particularly, spiral groove 31 extends in the whole length of strut 3 from top to bottom, and strut 3 is relative fixing with bent axle 24 position, can rotate together when bent axle 24 rotates with strut 3 with identical angular velocity.By being provided with the strut 3 of spiral groove 31, thus strut 3 when rotating under the drive of bent axle 24, lubricant oil bottom housing 1 is brought in the center hole 241 of bent axle 24 by the principle that strut 3 can be oiled by spiral, and then can lubricate each kinematic pair.

Here it is to be understood that strut 3 can all or part ofly extend in center hole 241, the mounting structure of strut 3 can be made thus more diversified, more adapt to the needs of actual conditions.

In example as depicted in figs. 1 and 2, the lower end of strut 3 exceedes the lower end of bent axle 24 downwards, and that is, the part of strut 3 extend in center hole 241 and another part is positioned at the outside of center hole 241.Alternatively, the distance H between the lower end of strut 3 and the lower end of bent axle 24 is more than or equal to 2mm, and thus, it is outside that a part of strut 3 is positioned at center hole 241, can promote the effect that spiral oils.

Be understandable that, the lower end of strut 3 or the lower end of bent axle 24 are preferably lower than the liquid level of lubricant oil, thus lubricant oil can enter into the gap between strut 3 and center hole 241 easily, and then the principle that spiral can be utilized to oil makes lubricant oil enter in center hole 241.

Alternatively, Placement between strut 3 and bent axle 24 can be arbitrary, such as strut 3 can be threaded connection with center hole 241, interference connects, the bonding or mode such as to be welded to connect connects, its objective is and strut 3 is connected with bent axle 24 is relatively-stationary, rotate relative to the center hole 241 of bent axle 24 to avoid strut 3.

Preferably, in order to improve the effect that oils of strut 3, strut 3 is formed with multiple spiral groove 31, the quantity of spiral groove 31 can be 2 ~ 4, that is, the quantity of the spiral groove 31 of strut 3 outside can be two, three or four, and such quantitative design both can ensure the effect that oils, the circulation area of lubricant oil can be ensured, and the structural strength of strut 3 can be ensured.Such as shown in Fig. 6, this example illustrate embodiment strut 3 being arranged three spiral grooves 31.Certain the utility model is not limited to this, the quantity of spiral groove 31 or one, or also can be more than four.

In alternate exemplary of the present utility model, as shown in Figure 2 and Figure 6, the diameter of the center hole 241 of bent axle 24 is D1, and the inscribed circle diameter of the external frame of the middle part entity structure horizontal projection of strut 3 is D2.Wherein, when " the middle part entity structure of strut 3 " refers to and be formed with spiral groove 31 on the periphery wall of strut 3, the part of spiral groove 31 is not formed in the middle part of the axial cross section of strut 3, the shape of an inscribe circle can be formed in its external frame, the diameter of this inscribe circle is D2, the diameter D1 of the center hole 241 of itself and bent axle 24 meets following relation: 1mm≤D2≤1/2*D1, thus as early as possible with the flow area ensureing lubricant oil, also can ensure the structural strength of strut 3.

It should be noted that, according to the compressor 100 of embodiment of the present utility model, the rotation direction of the spiral groove 31 outside strut 3 can be determined according to the sense of rotation of the bent axle 24 of compressor 100: when compressor 100 be clockwise rotation structure namely when bent axle 24 is for rotating clockwise structure, the rotation direction of spiral groove 31 is dextrorotation; When compressor 100 be counterclockwise rotation structure namely when bent axle 24 is for rotating counterclockwise structure, the rotation direction of spiral groove 31 is left-handed.

Supporting base 4 is located at the lower end of supplementary bearing 23, and thrust piece 5 is located at the lower end of strut 3, and bottom and the supporting base 4 of thrust piece 5 only support, and thrust piece 5 is positioned on the gyration center line of bent axle 24 with the contact center of supporting base 4.Thus, when the bent axle 24 of compressor 100 and rotor 62 are subject to the effect of the various downward power such as gravity, downward electromagnet pull, finally can act on the contact position of thrust piece 5 and supporting base 4 with joint efforts, because thrust piece 5 and the contact center of supporting base 4 are positioned on the gyration center line of bent axle 24, now Point of Strength is at the gyration center place of bent axle 24, thus turning radius is less, linear velocity is low, compressor 100 can be reduced largely and enter power, also can ensure the reliability of compressor 100 simultaneously.

Wherein, supporting base 4 is configured to the gap that can enter into strut 3 and center hole 241 for the lubricant oil bottom housing 1, and such as supporting base 4 can be frame structure, and lubricant oil can flow near strut 3 and center hole 241 through supporting base 4 thus.Certainly, the utility model is not limited to this, in example as depicted in figs. 1 and 2, supporting base 4 can be cover body structure, and supporting base is arranged the through hole 42 that can flow into for lubricant oil in the inner chamber 41 of supporting base 4 inside, thus lubricant oil enters into the inner chamber 41 of supporting base 4 by this through hole 42, and then flow to again near strut 3 and center hole 241.Further, when bent axle 24 drives strut 3 to rotate together, it is inner that lubricant oil enters into center hole 241 by the mode that spiral oils.

According to the compressor 100 of the utility model embodiment, by arranging the strut 3 with spiral groove in the lower end of bent axle 24, thus the spiral structure that oils can be adopted to ensure the lubrication of compressor 100, and the flow area of lubricant oil can be ensured, the performance of compressor 100 can be improved thus.And by arranging the supporting base 4 and thrust piece 5 that mutually only support, thus compressor 100 can be reduced largely enter power, ensure the axle head intermediate support of compressor 100, and then the reliability of compressor 100 can be improved, and structure is simple.

In embodiments more of the present utility model, thrust piece 5 contacts for point cantact or face with supporting base 4.Such as, as shown in Figure 2, thrust piece 5 and supporting base 4 are point cantact, and the area of contact between thrust piece 5 and supporting base 4 is little, thus friction between thrust piece 5 and supporting base 4 is little, and the performance of compressor 100 is promoted.

In a concrete example of the present utility model, see figures.1.and.2, thrust piece 5 can be the oval ball of thrust ball 51 or thrust.Thus, owing to be point cantact between the oval ball of thrust ball 51 or thrust and supporting base 4, effectively can reduce the friction between thrust piece 5 and supporting base 4 like this, thus reduce compressor 100 and enter power, the performance of raising compressor 100.In addition, the processing of thrust ball 51 or the oval ball of thrust is simple, and cost is low.

Further, the lower end of strut 3 can be formed with thrust groove 32, being partially received in thrust groove 32 of thrust piece 5.Such as, as shown in Figure 3 and Figure 4, thrust groove 32 can be formed to being recessed on by a part for the lower end surface of strut 3, and thrust ball 51 or the oval ball of thrust are placed in this thrust groove 32, and by with only the supporting of supporting base 4, can ensure that the position of thrust ball 51 or the oval ball of thrust is roughly fixing.Now, when bent axle 24 rotates, the oval ball of thrust ball 51 or thrust can rotate or mobile under the effect of external force thrust groove 32 in, can make thrust ball 51 or thrust ellipse ball can according to the position having stressing conditions adjustment and rubbed thus.Thrust groove 32 pairs of thrust pieces 5 play spacing effect, can ensure that thrust piece 5 is positioned on the gyration center line of bent axle 24 all the time with the contact center of supporting base 4.In addition, because thrust piece 5 is partially received in thrust groove 32, thus reduce thrust piece 5 taking up room in the vertical direction.

Certain the utility model is not limited to this, thrust ball 51 or the oval ball of thrust also can be fixed in thrust groove 32, thrust ball 51 or the oval ball of thrust cannot rotate or move in thrust groove 32, and now the contact position of thrust ball 51 or the oval ball of thrust and supporting base 4 is the position by frictional force of thrust ball 51 or the oval ball of thrust.Particularly, the oval ball of thrust ball 51 or thrust can be fixed in thrust groove 32 by arbitrary mode, such as bonding, welding manner etc.

Alternatively, the shape of thrust groove 32 can be arbitrary, and in such as, example shown in 3, thrust groove 32 is projected as taper in vertical plane, and in example as shown in Figure 4, thrust groove 32 is projected as circular arc in vertical plane.The concrete shape of certain thrust groove 32 specifically can be determined by actual production process.

In another concrete example of the present utility model, as shown in Figure 5, thrust piece 5 can be formed in the thrust body 52 bottom strut 3, that is, thrust body 52 is a part of structure of strut 3, and the bottom of thrust body 52 has plane or the downward arc surface protruded.When the bottom of thrust body 52 is plane, between thrust body 52 and supporting base 4, surface contact structure can be formed; When the bottom of thrust body 52 is arc surface, between thrust body 52 and supporting base 4, point cantact structure can be formed.In the structure shown in Fig. 5, the external frame of thrust body 52 is a part for spherical, thus when on the upper surface that it is only against supporting base 4, can and supporting base 4 between form point cantact structure, thus thrust body 52 and the area of contact of supporting base 4 can be reduced, reduce friction.

As shown in Figure 2 and Figure 5, in preferred embodiments more of the present utility model, the diameter of center hole 241 is D1, and the overall dimensions of the transverse direction of thrust piece 5 is d.After the horizontal maximum size of thrust piece 5 refers to that thrust piece 5 is in place, it in the horizontal direction can the overall dimensions of backstop center hole 241.Particularly, as shown in Figure 2, when thrust piece 5 is for thrust ball 51 or thrust ellipse ball, the horizontal maximum size d of thrust piece 5 refers to the diameter of thrust ball 51 or the oval ball of thrust; As shown in Figure 5, when thrust piece 5 is the thrust body 52 bottom strut 3, the horizontal maximum size d of thrust piece 5 refers to thrust body 52 overall dimensions in the horizontal direction, and when thrust body 52 is spherical, this is of a size of the diameter of thrust body 52.

Further, the overall dimensions of the transverse direction of thrust piece 5 is the diameter of d and center hole 241 is that D1 meets following relation: 1mm≤d < D1, that is, the horizontal maximum size of thrust piece 5 is less than the diameter D1 of center hole 241, can ensure that thrust piece 5 can not produce blocking to the center hole 241 of bent axle 24 thus, can ensure that lubricant oil can effectively, successfully enter in center hole 241 thus.

In embodiment as depicted in figs. 1 and 2, alternatively, be provided with thrust plate 9 between thrust piece 5 and supporting base 4, the hardness of thrust plate 9 is greater than the hardness of supporting base 4.That is, in order to improve the wear resistance between supporting base 4 and thrust piece 5, can the larger thrust plate of hardness 9 be set between thrust piece 5 and supporting base 4.In example of the present utility model, thrust plate 9 is located on supporting base 4, and alternatively, the Placement between thrust plate 9 and supporting base 4 can be arbitrary, such as, can be the modes such as welding, bonding, fastening piece connection.

Be all known according to other configuration examples of the compressor 100 of the utility model embodiment for those of ordinary skills as the concrete structure of main bearing 21, cylinder 22, supplementary bearing 23 etc. etc. and operation, no longer describe in detail here.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.

Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalents thereof.

Claims (10)

1. a compressor, is characterized in that, comprising:

Housing;

Compressing mechanism, described compressing mechanism is located in described housing, described compressing mechanism comprises main bearing, cylinder, supplementary bearing and bent axle, described main bearing is located at the top of described cylinder, described supplementary bearing is located at the bottom of described cylinder, described bent axle is located in described main bearing, described cylinder and described supplementary bearing successively, and described bent axle inside has center hole;

Strut, the periphery wall of described strut is provided with spiral groove, the stretching at least partially and be fixed in described center hole of described strut;

Supporting base, described supporting base is located at the lower end of described supplementary bearing, and described supporting base is configured to the gap that can enter into described strut and described center hole for the lubricant oil of described housing bottom; And

Thrust piece, described thrust piece is located at the lower end of described strut, and bottom and the described supporting base of described thrust piece only support, and the contact center of described thrust piece and described supporting base is positioned on the gyration center line of described bent axle.

2. compressor according to claim 1, is characterized in that, described thrust piece is the oval ball of thrust ball or thrust, and the lower end of described strut is formed with thrust groove, being partially received in described thrust groove of described thrust piece.

3. compressor according to claim 2, is characterized in that, described thrust groove is projected as taper or circular arc in vertical plane.

4. compressor according to claim 1, is characterized in that, described thrust piece is the thrust body be formed in bottom described strut, and the bottom of described thrust body has plane or the downward arc surface protruded.

5. compressor according to claim 1, is characterized in that, is provided with thrust plate between described thrust piece and described supporting base, and the hardness of described thrust plate is greater than the hardness of described supporting base.

6. compressor according to claim 1, is characterized in that, described strut is threaded with described center hole, interference connects, bonding or be welded to connect.

7. compressor according to claim 1, is characterized in that, described strut is formed with multiple described spiral groove, and the quantity of described spiral groove is 2 ~ 4.

8. compressor according to claim 1, is characterized in that, the diameter of described center hole is D1, and the inscribed circle diameter of the external frame of the middle part entity structure horizontal projection of described strut is D2, and meets following relation: 1mm≤D2≤1/2*D1.

9. compressor according to claim 1, is characterized in that, the diameter of described center hole is D1, and the overall dimensions of the transverse direction of described thrust piece is d, and meets following relation: 1mm≤d < D1.

10. compressor according to claim 1, is characterized in that, the lower end of described strut exceedes the lower end of described bent axle downwards, and the distance between the lower end of described strut and the lower end of described bent axle is more than or equal to 2mm.