CN103835950B - Single cylinder rotary compressor and duplex-cylinder rotary compressor - Google Patents

Abstract

The invention discloses a kind of single cylinder rotary compressor and duplex-cylinder rotary compressor.Single cylinder rotary compressor includes: cylinder, upper bearing (metal), lower bearing and multiple screw A, cylinder is provided with multiple screwed hole A.Upper bearing (metal) is located at above cylinder.Lower bearing is located at below cylinder.Multiple screw A coordinate with multiple screwed hole A one_to_one corresponding respectively, and the part in multiple screw A coordinates to be fixed on cylinder upper bearing (metal) through upper bearing (metal) with a part of multiple screwed hole A；Remainder in multiple screw A coordinates to be fixed on cylinder lower bearing through lower bearing with the remainder in multiple screwed hole A.Single cylinder rotary compressor according to embodiments of the present invention, improve the resistivity of the cylinder side force to acting on cylinder, the connection reliability between upper bearing (metal) and cylinder, cylinder and lower bearing can be improved, and its pressuring action to cylinder of screw can be resisted, make the torsional deformation of the vane slot of cylinder reduce.

Description

Single cylinder rotary compressor and duplex-cylinder rotary compressor

Technical field

The present invention relates to refrigerating field, especially relate to a kind of single cylinder rotary compressor and duplex-cylinder rotary compressor.

Background technology

Cylinder flattening design is to improve one of of paramount importance means of rotary compressor efficiency, and the cylinder of the design of flattening simultaneously is little for the discharge capacity of the Novel cooling mediums such as carbon dioxide.Wherein the reliability in the compression member portion of rotary compressor is had higher requirement by cylinder flattening design, traditional connected mode is that upper bearing (metal) and cylinder are linked together by first group of screw, lower bearing and cylinder are linked together by second group of screw, first group of screw and second group of screw have identical position, hole distribution in the circumferential, and the screw at same holes position place shares a screwed hole on cylinder, when cylinder cylinder height is less, in above-mentioned connected mode, cylinder screwed hole is not enough with screw engagement button number, ridge stress concentrates aggravation, easily produce ridge fracture failure.

Settling mode in correlation technique is to change cylinder screwed hole into through hole, lower bearing, cylinder are connected to the screwed hole on upper bearing (metal) by one group of screw, this results in the ability degradation of cylinder lateral force resisting, when conical pipe is pressed in cylinder chamber gas force by compression and compressor assembling process the pressing-in force effect in cylinder suction hole, cylinder is susceptible to dislocation with upper bearing (metal) or lower bearing, now this solution also results in vane slot deformation deterioration, compressor operation reliability decrease.

Summary of the invention

It is contemplated that one of technical problem solved at least to a certain extent in correlation technique.

For this, it is an object of the present invention to propose a kind of single cylinder rotary compressor, it is possible to improve the connection reliability between upper bearing (metal) and cylinder, cylinder and lower bearing.

Further object is that a kind of duplex-cylinder rotary compressor of proposition, reduce the torsional deformation of the vane slot of the first cylinder.

Single cylinder rotary compressor according to embodiments of the present invention, including: cylinder, described cylinder is provided with multiple screwed hole A；Upper bearing (metal), described upper bearing (metal) is located at above described cylinder；Lower bearing, described lower bearing is located at below described cylinder；Multiple screw A, the plurality of screw A coordinate with the plurality of screwed hole A one_to_one corresponding respectively, and the part in the plurality of screw A coordinates to be fixed on described cylinder described upper bearing (metal) through described upper bearing (metal) with a part of the plurality of screwed hole A；Remainder in the plurality of screw A coordinates to be fixed on described cylinder described lower bearing through described lower bearing with the remainder in the plurality of screwed hole A.

Single cylinder rotary compressor according to embodiments of the present invention, by making the part in multiple screw A coordinate to be fixed on cylinder upper bearing (metal) through upper bearing (metal) with a part of multiple screwed hole A.Remainder in multiple screw A coordinates to be fixed on cylinder by lower bearing through lower bearing with the remainder in multiple screwed hole A, thus improve the resistivity of the cylinder side force to acting on cylinder, the connection reliability between upper bearing (metal) and cylinder, cylinder and lower bearing can be improved, and its pressuring action to cylinder of screw A can be resisted, make the torsional deformation of the vane slot of cylinder reduce.

It addition, single cylinder rotary compressor according to the above embodiment of the present invention can also have following additional technical characteristic:

In some embodiments of the invention, described cylinder being additionally provided with screwing through hole A, described single cylinder rotary compressor also includes screw B, described screw B and described upper bearing (metal), described cylinder and described lower bearing is tightened together through the screwing through hole A on described cylinder.

According to some embodiments of the present invention, the length of action L between each described screw A and corresponding described screwed hole A meets equation below:

$L\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw A, and d is the screw thread nominal diameter of described screw A, σ_sFor the yield strength of described screw A, K is each described screw A and corresponding described moment coefficient corresponding for screwed hole A, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw A,For the lead angle of described screw A, ρ_vFor the screw thread equivalent friction angle of described screw A, μ is the friction factor between the head of described screw A and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw A and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw A.Thereby may be ensured that, between screwed hole A and corresponding screw A, there is enough joggle numbers, to guarantee threaded reliability.

In the preferred embodiments of the present invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole A of described cylinder.Excessive such that it is able to avoid influencing each other between each screwed hole A, it is ensured that threaded reliability.

In some examples of the present invention, the described remainder of the described a part of and the plurality of screw A of the plurality of screw A is interspersed.

Duplex-cylinder rotary compressor according to embodiments of the present invention, including: the first cylinder and the second cylinder, described first cylinder is positioned at the top of described second cylinder, and described first cylinder is provided with multiple screwed hole B；Median septum, septum plate is located between described first cylinder and described second cylinder；Upper bearing (metal), described upper bearing (metal) is located at above described first cylinder；Lower bearing, described lower bearing is located at below described second cylinder；Multiple screw C, the plurality of screw C coordinates with the plurality of screwed hole B one_to_one corresponding respectively, a part in the plurality of screw C coordinates through described upper bearing (metal) with the part in the plurality of screwed hole B, and the remainder in the plurality of screw C coordinates through described lower bearing, the second cylinder and median septum with the remainder in the plurality of screwed hole B.

Duplex-cylinder rotary compressor according to embodiments of the present invention, by making the part in multiple screw C coordinate through upper bearing (metal) with the part in multiple screwed hole B, remainder traverse lower bearing in multiple screw C, second cylinder and median septum coordinate with the remainder in multiple screwed hole B, such that it is able to improve the resistivity of first cylinder side force to acting on the first cylinder, ensure the connection reliability between the first cylinder and upper bearing (metal), and ensure that the first cylinder, median septum, connection reliability between second cylinder and lower bearing, advantageously reduce the torsional deformation of the vane slot of the first cylinder simultaneously.

It addition, duplex-cylinder rotary compressor according to the above embodiment of the present invention can also have following additional technical characteristic:

In some embodiments of the invention, the length of action L1 between each described screw C and corresponding described screwed hole B meets equation below:

$L1\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw C, and d is the screw thread nominal diameter of described screw C, σ_sFor the yield strength of described screw C, K is each described screw C and corresponding described moment coefficient corresponding for screwed hole B, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw C,For the lead angle of described screw C, ρ_vFor the screw thread equivalent friction angle of described screw C, μ is the friction factor between the head of described screw C and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw C and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw C.Thus there is enough joggle numbers between the screwed hole B ensured on the first cylinder and corresponding screw C, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole B of described first cylinder.Thereby through the wall thickness between each two screwed hole B ensured on the first cylinder, it is to avoid influence each other between each screwed hole B excessive, improve threaded reliability.

In some examples of the present invention, the described remainder of the described a part of and the plurality of screw C of the plurality of screw C is interspersed.

According to some embodiments of the present invention, described second cylinder is provided with multiple screwed hole C, described duplex-cylinder rotary compressor also includes multiple screw D, the plurality of screw D coordinates with the plurality of screwed hole C one_to_one corresponding respectively, a part in the plurality of screw D coordinates through described lower bearing with the part in the plurality of screwed hole C, and the remainder in the plurality of screw D coordinates through described upper bearing (metal), described first cylinder and septum plate with the remainder in the plurality of screwed hole C.

Duplex-cylinder rotary compressor according to embodiments of the present invention, by making the part in multiple screw D coordinate through lower bearing with the part in multiple screwed hole C, remainder traverse upper bearing (metal) in multiple screw D, first cylinder and median septum coordinate with the remainder in multiple screwed hole C, such that it is able to improve the resistivity of second cylinder side force to acting on the second cylinder, ensure the connection reliability between the second cylinder and lower bearing, and ensure that upper bearing (metal), first cylinder, connection reliability between median septum and the second cylinder, advantageously reduce the torsional deformation of the vane slot of the second cylinder simultaneously.

According to some embodiments of the present invention, described first cylinder is additionally provided with screwing through hole B, described duplex-cylinder rotary compressor also includes screw E, described screw E and described upper bearing (metal), described first cylinder and septum plate is tightened together through the screwing through hole B on described first cylinder.

In some embodiments of the invention, the length of action L2 between each described screw D and corresponding described screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw D, and d is the screw thread nominal diameter of described screw D, σ_sFor the yield strength of described screw D, K is each described screw D and corresponding described moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw D,For the lead angle of described screw D, ρ_vFor the screw thread equivalent friction angle of described screw D, μ is the friction factor between the head of described screw D and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw D and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw D.Thus there is enough joggle numbers between the screwed hole C ensured on the second cylinder and corresponding screw D, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of described second cylinder.Thereby through the wall thickness between each two screwed hole C ensured on the second cylinder, it is to avoid influence each other between each screwed hole C excessive, improve threaded reliability.

According to some embodiments of the present invention, described second cylinder is additionally provided with screwing through hole C, described duplex-cylinder rotary compressor also includes screw F, described screw F and described lower bearing, described second cylinder and septum plate is tightened together through the screwing through hole C on described second cylinder.

Duplex-cylinder rotary compressor according to embodiments of the present invention, including: the first cylinder and the second cylinder, described first cylinder is positioned at the top of described second cylinder, and described second cylinder is provided with multiple screwed hole C；Median septum, septum plate is located between described first cylinder and described second cylinder；Upper bearing (metal), described upper bearing (metal) is located at above described first cylinder；Lower bearing, described lower bearing is located at below described second cylinder；Multiple screw D, multiple described screw D coordinate with the plurality of screwed hole C one_to_one corresponding respectively, a part in the plurality of screw D coordinates through described lower bearing with the part in the plurality of screwed hole C, and the remainder in the plurality of screw D coordinates through described upper bearing (metal), described first cylinder and septum plate with the remainder in the plurality of screwed hole C.

Duplex-cylinder rotary compressor according to embodiments of the present invention, by making the part in multiple screw D coordinate through lower bearing with the part in multiple screwed hole C, remainder traverse upper bearing (metal) in multiple screw D, first cylinder and median septum coordinate with the remainder in multiple screwed hole C, such that it is able to improve the resistivity of second cylinder side force to acting on the second cylinder, ensure the connection reliability between the second cylinder and lower bearing, and ensure that upper bearing (metal), first cylinder, connection reliability between median septum and the second cylinder, advantageously reduce the torsional deformation of the vane slot of the second cylinder simultaneously.

It addition, duplex-cylinder rotary compressor according to the above embodiment of the present invention can also have following additional technical characteristic:

In some embodiments of the invention, the length of action L2 between each described screw D and corresponding described screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw D, and d is the screw thread nominal diameter of described screw D, σ_sFor the yield strength of described screw D, K is each described screw D and corresponding described moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw D,For the lead angle of described screw D, ρ_vFor the screw thread equivalent friction angle of described screw D, μ is the friction factor between the head of described screw D and the bearing-surface that contacts, D_wThe external diameter of the circular contact area formed with the head of d0 respectively described screw D and the bearing-surface that contacts and internal diameter, d is the screw thread nominal diameter of described screw D.Thus there is enough joggle numbers between the screwed hole C ensured on the second cylinder and corresponding screw D, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of described second cylinder.Thereby through the wall thickness between each two screwed hole C ensured on the second cylinder, it is to avoid influence each other between each screwed hole C excessive, improve threaded reliability.

In some embodiments of the invention, described second cylinder is additionally provided with screwing through hole C, described duplex-cylinder rotary compressor also includes screw F, described screw F and described lower bearing, described second cylinder and septum plate is tightened together through the screwing through hole C on described second cylinder.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of single cylinder rotary compressor according to embodiments of the present invention；

Fig. 2 is the top view of the compression member portion attachment screw distribution in the single cylinder rotary compressor shown in Fig. 1；

Fig. 3 be cylinder in the single cylinder rotary compressor shown in Fig. 1 by lateral forces time force diagram；

Fig. 4 is the cylinder vane slot local pressure in the single cylinder rotary compressor shown in Fig. 1 and vane slot torsional deformation schematic diagram；

Fig. 5 is screw connecting structure and sizing specification figure；

Fig. 6 is cylinder screwed hole force simplified curve chart vertically；

Fig. 7 is minimum wall thickness (MINI W.) h curve chart between screwed hole radial deformation-screwed hole；

Fig. 8 is the schematic diagram of duplex-cylinder rotary compressor according to an embodiment of the invention；

Fig. 9 is the top view for the compression member portion attachment screw distribution in the duplex-cylinder rotary compressor shown in Fig. 8；

Figure 10 is the schematic diagram of the compression member portion major part in duplex-cylinder rotary compressor in accordance with another embodiment of the present invention；

Figure 11 is the top view of the compression member portion attachment screw distribution shown in Figure 10.

Accompanying drawing labelling:

Single cylinder rotary compressor 100, duplex-cylinder rotary compressor 200, cylinder 1, upper bearing (metal) 2, lower bearing 3, screw A4, the first sub-screw 4a, the second sub-screw 4b, duplex-cylinder rotary compressor the 200, first cylinder the 5, second cylinder 6, median septum 7, screw C10, the 3rd sub-screw 10a, the 4th sub-screw 10b, screw D11, the 5th sub-screw 11a, the 6th sub-screw 11b, conical pipe 12, suction hole 13, vane slot 14

Detailed description of the invention

Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.

Below with reference to Fig. 1-Fig. 7, single cylinder rotary compressor 100 according to embodiments of the present invention is described, it is necessary to explanation, the operation principle etc. of single cylinder rotary compressor 100 is known by those skilled in the art, is just not described in detail here.

Single cylinder rotary compressor 100 according to embodiments of the present invention, including: cylinder 1, upper bearing (metal) 2, lower bearing 3 and multiple screw A4, wherein, cylinder 1, upper bearing (metal) 2 and lower bearing 3 form the compression member portion of single cylinder rotary compressor 100.Cylinder 1 is provided with multiple screwed hole A (not shown go out), cylinder 1 is additionally provided with the vane slot 14 for assembling slide plate (not shown go out) and for assembling the suction hole 13 of conical pipe 12.Upper bearing (metal) 2 is located at above cylinder 1.Lower bearing 3 is located at below cylinder 1, and upper bearing (metal) 2, cylinder 1 and lower bearing 3 limit the working chamber of cylinder 1.

Multiple screw A4 coordinate with multiple screwed hole A one_to_one corresponding respectively, and the part in multiple screw A4 coordinates to be fixed on cylinder 1 upper bearing (metal) 2 through upper bearing (metal) 2 with a part of multiple screwed hole A.Remainder in multiple screw A4 coordinates to be fixed on cylinder 1 lower bearing 3 through lower bearing 3 with the remainder in multiple screwed hole A.That is, one screwed hole A and one screw A4 coordinates, the screw A4 connecting upper bearing (metal) 2 and cylinder 1 is connected to the screwed hole A on cylinder 1, and this screwed hole A does not coordinate with other any screw A4, the screw A4 connecting lower bearing 3 and cylinder 1 is connected to the screwed hole A on cylinder 1, and this screwed hole A does not coordinate with other any screw A4.

Specifically, multiple screw A4 include at least one first sub-screw 4a and at least one second sub-screw 4b, at least one of which first sub-screw 4a coordinates to be fixed on cylinder 1 by upper bearing (metal) 2 with the partial threads hole A in multiple screwed hole A respectively, and at least one second sub-screw 4b coordinates to be fixed on cylinder 1 lower bearing 3 with the remainder screwed hole A in multiple screwed hole A respectively.Wherein, each first sub-screwed hole A corresponding for screw 4a does not coordinate with other any screws 4, and each second sub-screwed hole A corresponding for screw 4b does not coordinate with other any screws 4.As shown in Figure 2, the screw A4 urgent from upper bearing (metal) 2 (i.e. the first sub-screw 4a) that in figure, solid line represents, what in figure, dotted line represented is from the urgent screw A4 (i.e. the second sub-screw 4b) of lower bearing 3, the screw 4 urgent from upper bearing (metal) 2 and the different screwed hole A being all connected to from the screw A4 that lower bearing 3 is urgent cylinder 1, such that it is able to the requirement that the cylinder 1 that meets single cylinder rotary compressor 100 is highly little.

In the figure 2 example, a part of multiple screw A4 is interspersed with the remainder of multiple screw A4.It is to say, at least one first sub-screw 4a and at least one second sub-screw 4b is interspersed.

After air conditioning system is shut down for a long time, the coolant in system and the lubricating oil in compressor will be deposited on bottom compressor, even progress in the working chamber of cylinder 1, and now system start-up will be likely to be formed " hydraulic compression ".Compressor operating in bad working environments such as " hydraulic compressions " time, the reliability that the compression member portion of compressor connects is particularly important, and otherwise may result in the dislocation of cylinder 1 and upper bearing (metal) 2 and lower bearing 3, causes compressor card cylinder and scrap.The connected mode of relatively conventional cylinder through hole, the present embodiment cylinder 1 bears the ability of side force to be strengthened up to more than 50%.Force diagram when being illustrated in figure 3 the present embodiment cylinder 1 by lateral forces.In cylinder 1 operation process by gas force or in assembling process conical pipe 12 be pressed into the side force F such as power when being pressed into the suction hole 13 of cylinder 1_LaterallyDuring effect, except upper bearing (metal) 2 and lower bearing 3 provide frictional force f respectively at cylinder 1 end face_{Upper bearing (metal)}And f_{Lower bearing}Outward, relatively conventional cylinder 1 through hole mode, the screw 4 of the screwed hole being respectively connected to cylinder 1 in the present embodiment also will provide for directed force F_Screw, thus greatly strengthen the reliability that compression member portion connects.

On the other hand, vane slot 14 local of cylinder 1 is subject to upper bearing (metal) 2 and the lower bearing 3 thrust to cylinder 1 so that vane slot 14 both sides produce torsional deformation, and especially vane slot 14 suction side is due to suction hole 13 weakening local stiffness, and torsional deformation is even more serious.The torsional deformation of vane slot 14 both sides of cylinder 1 reduces the reliability of vane motion, and makes the frictional force of slide plate both sides or leakage increase.Fig. 4 is vane slot 14 local pressure and the vane slot 14 torsional deformation schematic diagram of the present embodiment cylinder 1.The design of relative industry cylinder through hole, single cylinder rotary compressor 100 according to embodiments of the present invention by the screwed hole of attachment screw A4 is arranged on cylinder 1, the screw A4 directed force F to the screwed hole of cylinder 1_{Upper bearing (metal) screw}、F_{Lower bearing screw}The thrust F to cylinder 1 with upper bearing (metal) 2 and lower bearing 3 respectively_{Upper bearing (metal)}And F_{Lower bearing}In opposite direction, its pressuring action to cylinder 1 can be resisted, make the torsional deformation of the vane slot 14 of cylinder 1 reduce.

Single cylinder rotary compressor 100 according to embodiments of the present invention, by making the part in multiple screw A4 coordinate to be fixed on cylinder 1 upper bearing (metal) 2 through upper bearing (metal) 2 with a part of multiple screwed hole A.Remainder in multiple screw A4 coordinates to be fixed on cylinder 1 by lower bearing 3 through lower bearing 3 with the remainder in multiple screwed hole A, thus improve the resistivity of the cylinder 1 side force to acting on cylinder 1, the connection reliability between upper bearing (metal) 2 and cylinder 1, cylinder 1 and lower bearing 3 can be improved, and its pressuring action to cylinder 1 of screw A4 can be resisted, make the torsional deformation of the vane slot 14 of cylinder 1 reduce.

Fig. 5 is screw A4 attachment structure and sizing specification figure, is wherein likely to be deafener or bearing surface with the bearing-surface of screw A4 head contact, depending on practical situation.Controlling screw A4 pretightning force typically via torque spanner method in compressor industry, urgent wrench torque T is used for overcoming screw thread pair moment of resistance T₁And the end-face friction moment T between screw A4 head and bearing-surface₂:

Wherein, F is screw pretightning force, and d is the screw thread nominal diameter of screw A4, d₂For the pitch diameter of thread of screw A4,For the lead angle of screw A4, ρ_vFor the screw thread equivalent friction angle of screw A4, μ is the friction factor between screw A4 head and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that screw A4 head and the bearing-surface that contacts are formed and internal diameter, such as Fig. 5, if contact area outward flange is non-circular, can be converted to actual outward flange shape the circle of homalographic, obtain equivalent D_wApproximate calculation.K is the moment coefficient corresponding with screw A4 for screwed hole A of cylinder 1, formula (1) can obtain:

For single line number screw thread, lead angleWith pitch P and pitch diameter of thread d₂Relation be:

Screw thread equivalent friction angle ρ_vWith screw thread equivalent friction factor μ_vRelation be:

ρ_v=arctan μ_v(4)

For convenience of description, as it is shown in figure 5, the circle screw thread engaged at initial point O place is defined as the 1st button engagement screw thread, engaging screw thread sequence number along X-direction and be incremented by successively, L is screw A4 and cylinder 1 screwed hole A length of action.It is maximum that screw A4 the urgent rear 1st buckles screw thread stress, along with the increase of engagement screw thread sequence number, and the non-linear reduction of screw thread stress of each button.In Simplified analysis, it is believed that each button screw thread stress linear change, carrying at ridge and have higher precision in fail-ure criterion analysis, linear simplifiation stress model each ridge shear stress contrasts as shown in Figure 6 with actual shear stress.It is 0 that screw A4 is positioned at X=L scope of freedom place ridge root shear stress, and it is screw A4 pretightning force F that screw A4 is positioned at the axial internal force in initial point O place, according to linear simplifiation stress model, can obtain:

$F={\∫}_0^L\mathrm{\π}d\mathrm{\τ}\left(x\right)dx=\frac{1}{2}\mathrm{\π}dL\mathrm{\τ}\left(0\right)---\left(5\right)$

Wherein, τ (0) is positioned at initial point O place shear stress for screw thread in linear simplifiation stress model.Ridge root is in three-dimensional stress state, but screwed hole A radially and circumferentially stress is much smaller compared with axial stress, and according to the 3rd strength theory, ridge root maximum shear stress must not exceed the maximum shear stress [τ] that material allows:

${\mathrm{\τ}}_{\max }=n\mathrm{\τ}\left(0\right)\≤\[\mathrm{\τ}\]=\frac{{\mathrm{\σ}}_s}{2}---\left(6\right)$

Wherein, σ_sFor the yield strength of screw A4, n considers the safety coefficient that ridge Root Stress is concentrated and aforesaid stresses state reduction is introduced, takes 2.Association type (1), (5), (6) can obtain the screwed hole A on the cylinder 1 and length of action L with this screwed hole A screw A4 being connected and should meet:

$L\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}---\left(7\right)$

Specifically, in the present embodiment, adopting the design of M6 single line number coarse thread, screw A4 strength grade is 12.9, and urgent moment T is 15Nm, and length of thread engagement (LE) calculates such as table 1.The present embodiment has enough joggle numbers by the guarantee of above-mentioned calculation and check is threaded, is prevented effectively from ridge fracture failure.

Table 1

In other words, in inventive embodiment, the length of action L between each screw A4 and corresponding screwed hole A meets equation below:

$L\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of screw A4, and d is the screw thread nominal diameter of screw A4, σ_sFor the yield strength of screw A4, K is each screw A4 and corresponding moment coefficient corresponding for screwed hole A, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of screw A4,For the lead angle of screw A4, ρ_vFor the screw thread equivalent friction angle of screw A4, μ is the friction factor between the head of screw A4 and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of screw A4 and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of screw A4.Thereby may be ensured that, between screwed hole A and corresponding screw A4, there is enough joggle numbers, to guarantee threaded reliability.

In an embodiment of the present invention, the different screwed hole A cylinder 1 all it are all connected to from upper bearing (metal) side and the screw A4 urgent from lower bearing side, namely at least one first sub-screw 4a and at least one second sub-screw 4b is respectively connecting to the different screwed hole A on cylinder 1, thus cylinder 1 upper screwed hole A increasing number can be caused, now the safe distance between screwed hole A seems most important for the screw A4 reliability connected.Fig. 7 is minimum wall thickness (MINI W.) h curve chart between screwed hole A radial deformation-screwed hole A.Visible along with the reduction of wall thickness h between two screwed hole A, the impact between them is gradually increased, and sharply increases after wall thickness h is less than 3mm, and the screw of different nominal diameters all shows this rule.When minimum wall thickness (MINI W.) h between screw pretightning force with two screwed hole A is identical, along with the increase of nominal diameter, affects between two screwed hole A and slightly increase.Excessive in order to avoid influencing each other between each screwed hole A, it is ensured that threaded reliability, in a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole A of cylinder 1.It is to say, the minimum wall thickness (MINI W.) h >=3mm between each screwed hole A on cylinder 1 and other screwed holes A on this cylinder 1.

In some embodiments of the invention, cylinder 1 is additionally provided with screwing through hole A (not shown go out), single cylinder rotary compressor 100 also includes screw B (not shown go out), screw B and upper bearing (metal) 2, cylinder 1 and lower bearing 3 is tightened together through the screwing through hole A on cylinder 1.It is to say, between cylinder 1, upper bearing (metal) 2 and lower bearing 3 except adopting screw A and the screwed hole A connected mode coordinated one by one, it is also possible to adopt the connected mode coordinated of a screw B and screwing through hole A simultaneously.Wherein, screw A can be the screwed hole being fixedly attached on upper bearing (metal) 2 can also be the screwed hole being fixedly attached on lower bearing 3.

It should be noted that, the invention is not restricted to this, single cylinder rotary compressor according to embodiments of the present invention, as long as ensureing on following basis: have at least the screw A connecting upper bearing (metal) and the cylinder screwed hole A being connected on cylinder, and this screwed hole A is not connected with other any screw A, simultaneously, the screw having at least a connection lower bearing and cylinder is connected to the screwed hole A on cylinder, and this screwed hole A is not connected with other any screw A, the upper bearing (metal) of single cylinder rotary compressor of the embodiment of the present invention, any connected mode between cylinder and lower bearing, can also be adopted.

Describing the duplex-cylinder rotary compressor 200 according to three embodiments of the present invention below with reference to Fig. 8-Figure 11, wherein, the operation principle etc. of duplex-cylinder rotary compressor 200 is known by those skilled in the art, is just not described in detail here.

Embodiment 1:

As shown in Figure 8 and Figure 9, in an embodiment of the present invention, duplex-cylinder rotary compressor 200 includes: first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3, multiple screw C10 and multiple screw D11.Wherein, first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3, multiple screw C10 and multiple screw D11 construct the compression member portion of duplex-cylinder rotary compressor 200.

First cylinder 5 is positioned at the top of the second cylinder 6, first cylinder 5 is provided with multiple screwed hole B (not shown go out), second cylinder 6 is provided with multiple screwed hole C (not shown go out), and is respectively provided with the vane slot 14 of assembling slide plate and for assembling the suction hole 13 of conical pipe 12 on the first cylinder 5 and the second cylinder 6.

Median septum 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 is located at above the first cylinder 5, limits the working chamber of the first cylinder 5 between upper bearing (metal) the 2, first cylinder 5 and median septum 7.Lower bearing 3 is located at below the second cylinder 6, limits the working chamber of the second cylinder 6 between median septum the 7, second cylinder 6 and lower bearing 3.

Multiple screw C10 coordinate with multiple screwed hole B one_to_one corresponding respectively, a part in multiple screw C10 coordinates through upper bearing (metal) 2 with the part in multiple screwed hole B, and the remainder in multiple screw C10 coordinates through lower bearing the 3, second cylinder 6 and median septum 7 with the remainder in multiple screwed hole B.It is to say, the corresponding screw C10 of each screwed hole B, the screw C10 connecting upper bearing (metal) 2 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10.The screw C10 connecting lower bearing the 3, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10.

Specifically, multiple screw C10 include at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b, 3rd sub-screw 10a is connected to the partial threads hole B on the first cylinder 5 to be fixed on by upper bearing (metal) 2 on first cylinder 5 through upper bearing (metal) 2, 4th sub-screw 10b traverse lower bearing 3, second cylinder 6 and median septum 7 are connected to the remainder screwed hole B on the first cylinder 5 with by lower bearing 3, second cylinder 6, median septum 7 and the first cylinder 5 are fixed together, wherein, each 3rd sub-screwed hole B corresponding for screw 10a does not coordinate with other any screw C10, each 4th sub-screwed hole B corresponding for screw 10b does not coordinate with other any screw C10.

Multiple screw D11 coordinate with multiple screwed hole C one_to_one corresponding respectively, a part in multiple screw D11 coordinates through lower bearing 3 with the part in multiple screwed hole C, and the remainder in multiple screw D11 coordinates through upper bearing (metal) the 2, first cylinder 5 and median septum 7 with the remainder in multiple screwed hole C.That is, each screwed hole C and one screw D11 coordinates, the screw D11 connecting lower bearing 3 and the second cylinder 6 is connected to the partial threads hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11, simultaneously, the screw D11 connecting upper bearing (metal) the 2, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the remainder screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11.

Specifically, multiple screw D11 include at least one the 5th sub-screw 11a and at least one the 6th sub-screw 11b, at least one the 5th sub-screw 11a is connected through lower bearing 3 with the partial threads hole C on the second cylinder 6, at least one the 6th sub-screw 11b sequentially passes through upper bearing (metal) the 2, first cylinder 5 and is connected with the remainder screwed hole C on the second cylinder 6 with median septum 7, wherein, each 5th sub-screwed hole C corresponding for screw 11a does not coordinate with other any screw D11, and each 6th sub-screwed hole C corresponding for screw 11b does not coordinate with other any screw D11.

Fig. 9 indicates that the top view of Fig. 8 compression member portion attachment screw distribution, that in figure, solid line represents is the screw C10 urgent from upper bearing (metal) side, that dotted line represents is the screw C10 urgent from lower bearing side, it is possible to meet the requirement that the cylinder height of duplex-cylinder rotary compressor 200 is little.The screw C10 having two connection upper bearing (metal)s 2 and the first cylinder 5 in the present embodiment is connected to the screwed hole B (namely having two the 3rd sub-screw 10a to be connected to screwed hole B) on the first cylinder 5, and screwed hole B is not connected with other any screws.There is the screwed hole B (namely having three the 4th sub-screw 10b to be connected to screwed hole B) that the screw C10 of three connection lower bearings the 3, second cylinder 6, median septum 7 and the first cylinder 5 is connected on the first cylinder 5, and this screwed hole B is not connected with other any screws.The screw D11 having two connection lower bearings 3 and the second cylinder 6 is connected to the screwed hole C (namely having two the 5th sub-screw 11a to be connected to screwed hole C) on the second cylinder 6, and this screwed hole C is not connected with other any screws.There is the screwed hole C (namely having three the 6th sub-screw 11b to be connected to screwed hole C) that the screw D11 of three connection upper bearing (metal)s the 2, first cylinder 5, median septum 7 and the second cylinder 6 is connected on the second cylinder 6, and this screwed hole C is not connected with other any screws.

Wherein, it should be noted that, first cylinder 5 of duplex-cylinder rotary compressor 200 according to embodiments of the present invention is identical with the stressing conditions principle of the cylinder 1 in single cylinder rotary compressor 100 according to the above embodiment of the present invention with the stressing conditions of the second cylinder 6, is just not described in detail here.

Duplex-cylinder rotary compressor 200 according to embodiments of the present invention, the resistance of the first cylinder 5 and the second cylinder 6 side force to being applied on the first cylinder 5 and the second cylinder 6 can be improved simultaneously, ensure the reliability that compression member portion connects, advantageously reduce the torsional deformation of vane slot 14 on the first cylinder 5 and the second cylinder 6 simultaneously.

Wherein, it should be noted that, minimum wall thickness (MINI W.) design principle between minimum wall thickness (MINI W.) design principle between the design principle of length of action between the design principle of the length of action between screw C10 and screwed hole B, screw D11 and screwed hole C, each screwed hole B of the first cylinder 5, each screwed hole C of the second cylinder 6 is all similar with single cylinder rotary compressor 100 according to the above embodiment of the present invention, just repeats no more here.

Therefore, in some embodiments of the invention, the length of action L1 between each screw C10 and corresponding screwed hole B meets equation below:

$L1\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of screw C10, and d is the screw thread nominal diameter of screw C10, σ_sFor the yield strength of screw C10, K is each screw C10 and corresponding moment coefficient corresponding for screwed hole B, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of screw C10,For the lead angle of screw C10, ρ_vFor the screw thread equivalent friction angle of screw C10, μ is the friction factor between the head of screw C10 and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of screw C10 and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of screw C10.Thus there is enough joggle numbers between the screwed hole B ensured on the first cylinder 5 and corresponding screw C10, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole B of the first cylinder 5.It is to say, the minimum wall thickness (MINI W.) h >=3mm between each screwed hole B on the first cylinder 5 and other screwed holes B on the first cylinder 5.Thereby through the wall thickness between each two screwed hole B ensured on the first cylinder 5, it is to avoid influence each other between each screwed hole B excessive, improve threaded reliability.

According to some embodiments of the present invention, the length of action L2 between each screw D11 and corresponding screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of screw D11, and d is the screw thread nominal diameter of screw D11, σ_sFor the yield strength of screw D11, K is each screw D11 and corresponding moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of screw D11,For the lead angle of screw D11, ρ_vFor the screw thread equivalent friction angle of screw D11, μ is the friction factor between the head of screw D11 and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of screw D11 and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of screw D11.Thus there is enough joggle numbers between the screwed hole C ensured on the second cylinder 6 and corresponding screw D11, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of the second cylinder 6.It is to say, the minimum wall thickness (MINI W.) h >=3mm between each screwed hole C on the second cylinder 6 and other screwed holes C on the second cylinder 6.Thereby through the wall thickness between each two screwed hole C ensured on the second cylinder 6, it is to avoid influence each other between each screwed hole C excessive, improve threaded reliability.

In some embodiments of the invention, first cylinder 5 is additionally provided with screwing through hole B (not shown go out), duplex-cylinder rotary compressor 200 also includes screw E (not shown go out), screw E and upper bearing (metal) the 2, first cylinder 5 and median septum 7 is tightened together through the screwing through hole B on the first cylinder 5.

Second cylinder 6 is additionally provided with screwing through hole C (not shown go out), duplex-cylinder rotary compressor 200 also includes screw F (not shown go out), screw F and lower bearing the 3, second cylinder 6 and median septum 7 is tightened together through the screwing through hole C on the second cylinder 6.

That is, upper bearing (metal) the 2, first cylinder 5, between median septum the 7, second cylinder 6 and lower bearing 3 except adopt screwed hole B and screw C10 coordinate one by one and except screwed hole C and the screw D11 connected mode coordinated one by one, screwing through hole B and the screw E connected mode coordinated can also be adopted simultaneously, certainly can also adopt screwing through hole C and the screw F connected mode coordinated simultaneously.

It should be noted that, the invention is not restricted to this, duplex-cylinder rotary compressor according to embodiments of the present invention, as long as ensureing on following basis: have at least the screw C10 connecting upper bearing (metal) 2 and the first cylinder 5 to be connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10；The screw C10 having at least a connection lower bearing the 3, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10；The screw D11 having at least a connection lower bearing 3 and the second cylinder 6 is connected to the screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11；The screw D11 having at least a connection upper bearing (metal) the 2, first cylinder 5, median septum 7 and the second cylinder 6 is connected to the screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11.Upper bearing (metal) 2, first cylinder 5 of the duplex-cylinder rotary compressor of the embodiment of the present invention, between median septum the 7, second cylinder 6 and lower bearing 3, any connected mode can also be adopted.

In some cases, in duplex-cylinder rotary compressor 200, a cylinder connection reliability requires higher than another cylinder, in positive displacement compressor, such as there is the design apparently higher than another cylinder of the cylinder height, this will cause that the cylinder that cylinder height is higher is subject to gas side to power far above another cylinder under identical working condition, this just requires to lay particular stress on to some extent in design, and namely face describes under the invention embodiment 2 and embodiment 3 are applicable to above-mentioned application scenario.

Embodiment 2:

In this embodiment, assuming that the first cylinder 5 connection reliability requirement is higher, second cylinder 6 then requires relatively low, as shown in Figure 10, duplex-cylinder rotary compressor 200 according to embodiments of the present invention, including: first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3 and multiple screw C10.Wherein, first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3 and multiple screw C10 construct the compression member portion of duplex-cylinder rotary compressor 200.

First cylinder 5 is positioned at the top of the second cylinder 6, and the first cylinder 5 is provided with multiple screwed hole B, and is respectively provided with the vane slot 14 of assembling slide plate and for assembling the suction hole 13 of conical pipe 12 on the first cylinder 5 and the second cylinder 6.

Median septum 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 is located at above the first cylinder 5, limits the working chamber of the first cylinder 5 between upper bearing (metal) the 2, first cylinder 5 and median septum 7.Lower bearing 3 is located at below the second cylinder 6, limits the working chamber of the second cylinder 6 between median septum the 7, second cylinder 6 and lower bearing 3.

Multiple screw C10 coordinate with multiple screwed hole B one_to_one corresponding respectively, a part in multiple screw C10 coordinates through upper bearing (metal) 2 with the part in multiple screwed hole B, and the remainder in multiple screw C10 coordinates through lower bearing the 3, second cylinder 6 and median septum 7 with the remainder in multiple screwed hole B.It is to say, the corresponding screw C10 of each screwed hole B, the screw C10 connecting upper bearing (metal) 2 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10.The screw C10 connecting lower bearing the 3, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10.

Specifically, multiple screw C10 include at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b, 3rd sub-screw 10a is connected to the partial threads hole B on the first cylinder 5 to be fixed on by upper bearing (metal) 2 on first cylinder 5 through upper bearing (metal) 2, 4th sub-screw 10b traverse lower bearing 3, second cylinder 6 and median septum 7 are connected to the remainder screwed hole B on the first cylinder 5 with by lower bearing 3, second cylinder 6, median septum 7 and the first cylinder 5 are fixed together, wherein, each 3rd sub-screwed hole B corresponding for screw 10a does not coordinate with other any screw C10, each 4th sub-screwed hole B corresponding for screw 10b does not coordinate with other any screw C10.As shown in figure 11, the screw urgent from upper bearing (metal) 2 (i.e. the 3rd sub-screw 10a) that in figure, solid line represents, what in figure, dotted line represented is from the urgent screw (i.e. the 4th sub-screw 10b) of lower bearing 3, the screw urgent from upper bearing (metal) 2 and the different screwed hole B being all connected to from the screw that lower bearing 3 is urgent first cylinder 5, such that it is able to the requirement that the cylinder height that meets duplex-cylinder rotary compressor 200 is little.

In the example depicted in fig. 11, a part of multiple screw C10 is interspersed with the remainder of multiple screw C10, say, that at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b is interspersed.

Wherein it is desired to illustrate, the stressing conditions of the first cylinder 5 of duplex-cylinder rotary compressor 200 according to embodiments of the present invention is identical with the stressing conditions principle of the cylinder 1 of single cylinder rotary compressor 100 according to the above embodiment of the present invention, is just not described in detail here.

Duplex-cylinder rotary compressor 200 according to embodiments of the present invention, by making the part in multiple screw C10 coordinate through upper bearing (metal) 2 with the part in multiple screwed hole B, remainder traverse lower bearing 3 in multiple screw C10, second cylinder 6 and median septum 7 coordinate with the remainder in multiple screwed hole B, such that it is able to improve the resistivity of first cylinder 5 side force to acting on the first cylinder 5, ensure the connection reliability between the first cylinder 5 and upper bearing (metal) 2, and ensure that the first cylinder 5, median septum 7, connection reliability between second cylinder 6 and lower bearing 3, advantageously reduce the torsional deformation of the vane slot 14 of the first cylinder 5 simultaneously.

In this embodiment, second cylinder 6 can adopt cylinder via design completely, for the consideration reducing assembly technology difficulty, two Screws be can additionally design and lower bearing 3 and the second cylinder 6 connected, first fastening lower bearing 3 and the second cylinder 6, upper bearing (metal) 2 and the first cylinder 5 respectively during assembling, then tighten together with the miscellaneous part such as median septum 7.

Wherein, it should be noted that, the design principle of the length of action between screw C10 and screwed hole B, the first cylinder 5 each screwed hole B between minimum wall thickness (MINI W.) design principle all similar with single cylinder rotary compressor 100 according to the above embodiment of the present invention, just repeat no more here.

Therefore, according to some embodiments of the present invention, the length of action L1 between each screw C10 and corresponding screwed hole B meets equation below:

$L1\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of screw C10, and d is the screw thread nominal diameter of screw C10, σ_sFor the yield strength of screw C10, K is each screw C10 and corresponding moment coefficient corresponding for screwed hole B, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of screw C10,For the lead angle of screw C10, ρ_vFor the screw thread equivalent friction angle of screw C10, μ is the friction factor between the head of screw C10 and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of screw C10 and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of screw C10.Thus there is enough joggle numbers between the screwed hole B ensured on the first cylinder 5 and corresponding screw C10, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole B of the first cylinder 5.It is to say, the minimum wall thickness (MINI W.) h >=3mm between each screwed hole B on the first cylinder 5 and other screwed holes B on the first cylinder 5.Thereby through the wall thickness between each two screwed hole B ensured on the first cylinder 5, it is to avoid influence each other between each screwed hole B excessive, improve threaded reliability.

In some embodiments of the invention, first cylinder 5 is additionally provided with screwing through hole B (not shown go out), duplex-cylinder rotary compressor 200 also includes screw E (not shown go out), screw E and upper bearing (metal) the 2, first cylinder 5 and median septum 7 is tightened together through the screwing through hole B on the first cylinder 5.

It is to say, upper bearing (metal) the 2, first cylinder 5, between median septum the 7, second cylinder 6 and lower bearing 3 except adopting except screwed hole B and the screw C10 connected mode coordinated one by one, it is also possible to adopt the connected mode of screwing through hole B and screw E cooperation simultaneously.

It should be noted that, the invention is not restricted to this, duplex-cylinder rotary compressor according to embodiments of the present invention, as long as ensureing on following basis: have at least the screw C10 connecting upper bearing (metal) 2 and the first cylinder 5 to be connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10；The screw C10 having at least a connection lower bearing the 3, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the screwed hole B on the first cylinder 5, and this screwed hole B is not connected with other any screw C10.Upper bearing (metal) 2, first cylinder 5 of the duplex-cylinder rotary compressor of the embodiment of the present invention, between median septum the 7, second cylinder 6 and lower bearing 3, any connected mode can also be adopted.

Embodiment 3:

In this embodiment, the second cylinder 6 connection reliability is required higher, and the connection reliability of the first cylinder 5 is required relatively low.Duplex-cylinder rotary compressor 200 according to embodiments of the present invention, including: first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3 and multiple screw D11.Wherein, first cylinder the 5, second cylinder 6, median septum 7, upper bearing (metal) 2, lower bearing 3 and multiple screw D11 construct the compression member portion of duplex-cylinder rotary compressor 200.

First cylinder 5 is positioned at the top of the second cylinder 6, and the second cylinder 6 is provided with multiple screwed hole C, and is respectively provided with the vane slot 14 of assembling slide plate and for assembling the suction hole 13 of conical pipe 12 on the first cylinder 5 and the second cylinder 6.

Median septum 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 is located at above the first cylinder 5, limits the working chamber of the first cylinder 5 between upper bearing (metal) the 2, first cylinder 5 and median septum 7.Lower bearing 3 is located at below the second cylinder 6, limits the working chamber of the second cylinder 6 between median septum the 7, second cylinder 6 and lower bearing 3.

Multiple screw D11 coordinate with multiple screwed hole C one_to_one corresponding respectively, a part in multiple screw D11 coordinates through lower bearing 3 with the part in multiple screwed hole C, and the remainder in multiple screw D11 coordinates through upper bearing (metal) the 2, first cylinder 5 and median septum 7 with the remainder in multiple screwed hole C.That is, each screwed hole C and one screw D11 coordinates, the screw D11 connecting lower bearing 3 and the second cylinder 6 is connected to the partial threads hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11, simultaneously, the screw D11 connecting upper bearing (metal) the 2, second cylinder 6, median septum 7 and the first cylinder 5 is connected to the remainder screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11.

Specifically, multiple screw D11 include at least one the 5th sub-screw 11a and at least one the 6th sub-screw 11b, at least one the 5th sub-screw 11a is connected through lower bearing 3 with the partial threads hole C on the second cylinder 6, at least one the 6th sub-screw 11b sequentially passes through upper bearing (metal) the 2, first cylinder 5 and is connected with the remainder screwed hole C on the second cylinder 6 with median septum 7, wherein, each 5th sub-screwed hole C corresponding for screw 11a does not coordinate with other any screw D11, and each 6th sub-screwed hole C corresponding for screw 11b does not coordinate with other any screw D11.As shown in Figure 9, the screw urgent from upper bearing (metal) 2 (i.e. the 5th sub-screw 11a) that in figure, solid line represents, what in figure, dotted line represented is from the urgent screw (i.e. the 6th sub-screw 11b) of lower bearing 3, the screw urgent from upper bearing (metal) 2 and the different screwed hole C being all connected to from the screw that lower bearing 3 is urgent second cylinder 6, such that it is able to the requirement that the cylinder height that meets duplex-cylinder rotary compressor 200 is little.

The remainder of a part of multiple screw D11 and multiple screw D11 is interspersed.It is to say, at least one the 5th sub-screw 11a and at least one the 6th sub-screw 11b is interspersed.

Thus, duplex-cylinder rotary compressor 200 according to embodiments of the present invention, by making the part in multiple screw D11 coordinate through lower bearing 3 with the part in multiple screwed hole C, remainder traverse upper bearing (metal) 2 in multiple screw D11, first cylinder 5 and median septum 7 coordinate with the remainder in multiple screwed hole C, such that it is able to improve the resistivity of second cylinder 6 side force to acting on the second cylinder 6, ensure the connection reliability between the second cylinder 6 and lower bearing 3, and ensure that upper bearing (metal) 2, first cylinder 5, connection reliability between median septum 7 and the second cylinder 6, advantageously reduce the torsional deformation of the vane slot 14 of the second cylinder 6 simultaneously.

Wherein, it should be noted that, the design principle of the length of action between screw D11 and screwed hole C, the second cylinder 6 each screwed hole C between minimum wall thickness (MINI W.) design principle all similar with single cylinder rotary compressor 100 according to the above embodiment of the present invention, just repeat no more here.

Therefore, according to some embodiments of the present invention, the length of action L2 between each screw D11 and corresponding screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of screw D11, and d is the screw thread nominal diameter of screw D11, σ_sFor the yield strength of screw D11, K is each screw D11 and corresponding moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of screw D11,For the lead angle of screw D11, ρ_vFor the screw thread equivalent friction angle of screw D11, μ is the friction factor between the head of screw D11 and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of screw D11 and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of screw D11.Thus there is enough joggle numbers between the screwed hole C ensured on the second cylinder 6 and corresponding screw D11, and then guarantee threaded reliability.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of the second cylinder 6.It is to say, the minimum wall thickness (MINI W.) h >=3mm between each screwed hole C on the second cylinder 6 and other screwed holes C on the second cylinder 6.Thereby through the wall thickness between each two screwed hole C ensured on the second cylinder 6, it is to avoid influence each other between each screwed hole C excessive, improve threaded reliability.

In some embodiments of the invention, second cylinder 6 is additionally provided with screwing through hole C (not shown go out), duplex-cylinder rotary compressor 200 also includes screw F (not shown go out), screw F and lower bearing the 3, second cylinder 6 and median septum 7 is tightened together through the screwing through hole C on the second cylinder 6.

It is to say, upper bearing (metal) the 2, first cylinder 5, between median septum the 7, second cylinder 6 and lower bearing 3 except adopting except screwed hole C and the screw D11 connected mode coordinated one by one, it is also possible to adopt the connected mode of screwing through hole C and screw F cooperation simultaneously.

It should be noted that, the invention is not restricted to this, duplex-cylinder rotary compressor according to embodiments of the present invention, as long as ensureing on following basis: have at least the screw D11 of a connection lower bearing 3 and the second cylinder 6 to be connected to the screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11；The screw D11 having at least a connection upper bearing (metal) the 2, first cylinder 5, median septum 7 and the second cylinder 6 is connected to the screwed hole C on the second cylinder 6, and this screwed hole C is not connected with other any screw D11.Upper bearing (metal) 2, first cylinder 5 of the duplex-cylinder rotary compressor of the embodiment of the present invention, between median septum the 7, second cylinder 6 and lower bearing 3, any connected mode can also be adopted.

Wherein, it should be noted that, other of single cylinder rotary compressor 100 according to embodiments of the present invention and duplex-cylinder rotary compressor 200 constitute the structures such as such as piston, slide plate, fluid reservoir, it has been prior art all, and known by those skilled in the art, namely these parts can design fully according to existing mode, is just no longer described in detail one by one here.

In describing the invention, 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 ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.

Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include one or more these features.In describing the invention, " multiple " are meant that two or more, unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals.For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.

In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.

Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.

Claims (17)

1. a single cylinder rotary compressor, it is characterised in that including:

Cylinder, described cylinder is provided with multiple screwed hole A；

Upper bearing (metal), described upper bearing (metal) is located at above described cylinder；

Lower bearing, described lower bearing is located at below described cylinder；

Multiple screw A, the plurality of screw A coordinate with the plurality of screwed hole A one_to_one corresponding respectively, and the part in the plurality of screw A coordinates to be fixed on described cylinder described upper bearing (metal) through described upper bearing (metal) with a part of the plurality of screwed hole A；Remainder in the plurality of screw A coordinates to be fixed on described cylinder by described lower bearing through described lower bearing with the remainder in the plurality of screwed hole A, each described screwed hole A runs through described cylinder on the thickness direction of described cylinder, and the described screw A of each described screwed hole A and one coordinates.

2. single cylinder rotary compressor according to claim 1, it is characterized in that, described cylinder is additionally provided with screwing through hole A, described single cylinder rotary compressor also includes screw B, described screw B and described upper bearing (metal), described cylinder and described lower bearing is tightened together through the screwing through hole A on described cylinder.

3. single cylinder rotary compressor according to claim 1, it is characterised in that the length of action L between each described screw A and corresponding described screwed hole A meets equation below:

$L\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw A, and d is the screw thread nominal diameter of described screw A, σ_sFor the yield strength of described screw A, K is each described screw A and corresponding described moment coefficient corresponding for screwed hole A, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw A,For the lead angle of described screw A, ρ_vFor the screw thread equivalent friction angle of described screw A, μ is the friction factor between the head of described screw A and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw A and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw A.

4. single cylinder rotary compressor according to claim 1, it is characterised in that the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole A of described cylinder.

5. single cylinder rotary compressor according to claim 1, it is characterised in that the described remainder of the described a part of and the plurality of screw A of the plurality of screw A is interspersed.

6. a duplex-cylinder rotary compressor, it is characterised in that including:

First cylinder and the second cylinder, described first cylinder is positioned at the top of described second cylinder, and described first cylinder is provided with multiple screwed hole B；

Median septum, septum plate is located between described first cylinder and described second cylinder；

Upper bearing (metal), described upper bearing (metal) is located at above described first cylinder；

Lower bearing, described lower bearing is located at below described second cylinder；

Multiple screw C, the plurality of screw C coordinates with the plurality of screwed hole B one_to_one corresponding respectively, a part in the plurality of screw C coordinates through described upper bearing (metal) with the part in the plurality of screwed hole B, and the remainder in the plurality of screw C coordinates through described lower bearing, the second cylinder and median septum with the remainder in the plurality of screwed hole B；

Described second cylinder is provided with multiple screwed hole C, described duplex-cylinder rotary compressor also includes multiple screw D, the plurality of screw D coordinates with the plurality of screwed hole C one_to_one corresponding respectively, a part in the plurality of screw D coordinates through described lower bearing with the part in the plurality of screwed hole C, and the remainder in the plurality of screw D coordinates through described upper bearing (metal), described first cylinder and septum plate with the remainder in the plurality of screwed hole C.

7. duplex-cylinder rotary compressor according to claim 6, it is characterised in that the length of action L1 between each described screw C and corresponding described screwed hole B meets equation below:

$L1\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw C, and d is the screw thread nominal diameter of described screw C, σ_sFor the yield strength of described screw C, K is each described screw C and corresponding described moment coefficient corresponding for screwed hole B, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw C,For the lead angle of described screw C, ρ_vFor the screw thread equivalent friction angle of described screw C, μ is the friction factor between the head of described screw C and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw C and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw C.

8. duplex-cylinder rotary compressor according to claim 6, it is characterised in that the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole B of described first cylinder.

9. duplex-cylinder rotary compressor according to claim 6, it is characterised in that the described remainder of the described a part of and the plurality of screw C of the plurality of screw C is interspersed.

10. duplex-cylinder rotary compressor according to claim 6, it is characterized in that, described first cylinder is additionally provided with screwing through hole B, described duplex-cylinder rotary compressor also includes screw E, described screw E and described upper bearing (metal), described first cylinder and septum plate is tightened together through the screwing through hole B on described first cylinder.

11. duplex-cylinder rotary compressor according to claim 6, it is characterised in that the length of action L2 between each described screw D and corresponding described screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw D, and d is the screw thread nominal diameter of described screw D, σ_sFor the yield strength of described screw D, K is each described screw D and corresponding described moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw D,For the lead angle of described screw D, ρ_vFor the screw thread equivalent friction angle of described screw D, μ is the friction factor between the head of described screw D and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw D and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw D.

12. duplex-cylinder rotary compressor according to claim 6, it is characterised in that the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of described second cylinder.

13. duplex-cylinder rotary compressor according to claim 6, it is characterized in that, described second cylinder is additionally provided with screwing through hole C, described duplex-cylinder rotary compressor also includes screw F, described screw F and described lower bearing, described second cylinder and septum plate is tightened together through the screwing through hole C on described second cylinder.

14. a duplex-cylinder rotary compressor, it is characterised in that including:

First cylinder and the second cylinder, described first cylinder is positioned at the top of described second cylinder, and described second cylinder is provided with multiple screwed hole C；

Median septum, septum plate is located between described first cylinder and described second cylinder；

Upper bearing (metal), described upper bearing (metal) is located at above described first cylinder；

Lower bearing, described lower bearing is located at below described second cylinder；

Multiple screw D, multiple described screw D coordinate with the plurality of screwed hole C one_to_one corresponding respectively, a part in the plurality of screw D coordinates through described lower bearing with the part in the plurality of screwed hole C, and the remainder in the plurality of screw D coordinates through described upper bearing (metal), described first cylinder and septum plate with the remainder in the plurality of screwed hole C.

15. duplex-cylinder rotary compressor according to claim 14, it is characterised in that the length of action L2 between each described screw D and corresponding described screwed hole C meets equation below:

$L2\≥\frac{8T}{{\mathrm{\πd}}^2{\mathrm{K\σ}}_s}$

Wherein, T is the urgent moment of described screw D, and d is the screw thread nominal diameter of described screw D, σ_sFor the yield strength of described screw D, K is each described screw D and corresponding described moment coefficient corresponding for screwed hole C, and K is limited by equation below:

Wherein, d₂For the pitch diameter of thread of described screw D,For the lead angle of described screw D, ρ_vFor the screw thread equivalent friction angle of described screw D, μ is the friction factor between the head of described screw D and the bearing-surface that contacts, D_wAnd d₀The respectively external diameter of the circular contact area that the head of described screw D and the bearing-surface that contacts are formed and internal diameter, d is the screw thread nominal diameter of described screw D.

16. duplex-cylinder rotary compressor according to claim 14, it is characterised in that the minimum wall thickness (MINI W.) h >=3mm in often part between adjacent two screwed hole C of described second cylinder.

17. duplex-cylinder rotary compressor according to claim 14, it is characterized in that, described second cylinder is additionally provided with screwing through hole C, described duplex-cylinder rotary compressor also includes screw F, described screw F and described lower bearing, described second cylinder and septum plate is tightened together through the screwing through hole C on described second cylinder.