CN103835950A - Single-cylinder rotary compressor and double-cylinder rotary compressor - Google Patents

Abstract

The invention discloses a single-cylinder rotary compressor and a double-cylinder rotary compressor; the single-cylinder rotary compressor comprises a cylinder, an upper bearing, a lower bearing, and a plurality of first screws, wherein the cylinder is provided with a plurality of first screw holes; the upper bearing is arranged on the cylinder; the lower bearing is arranged under the cylinder; the first screws are respectively and correspondingly matched with the first screw holes; a part of the first screws penetrate the upper bearing and match with a part of the first screw holes so as to fix the upper bearing on the cylinder; the rest of the first screws penetrate the lower bearing and match with the rest of the first screw holes so as to fix the lower bearing on the cylinder. The single-cylinder rotary compressor can improve opposing capability of the cylinder against side force applied on the cylinder, thereby improving connecting reliability between the upper bearing and the cylinder and between the cylinder and the lower bearing; pressing effect to the cylinder by the screws can be resisted, so twisted deformation of a slide groove of the cylinder can be reduced.

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 technique

Cylinder flattening design is to improve one of of paramount importance means of rotary compressor efficiency, and the cylinder of the design of flattening is simultaneously little for the discharge capacity of the Novel cooling mediums such as carbon dioxide.The reliability that wherein cylinder flattening designs the compression member portion to rotary compressor has higher requirement, traditional Placement is that first group of screw links together upper bearing (metal) and cylinder, second group of screw links together lower bearing and cylinder, first group of screw and second group of screw upwards have identical position, hole distribution week, and the screw at same holes position place shares a tapped hole on cylinder, when cylinder cylinder high hour, in above-mentioned Placement, cylinder tapped hole and screw engagement button are counted deficiency, worm tooth stress is concentrated aggravation, easily produce worm tooth fracture failure.

Settling mode in correlation technique is to change cylinder tapped hole into through hole, lower bearing, cylinder are connected to the tapped hole on upper bearing (metal) by one group of screw, this just causes the ability degradation of cylinder lateral force resisting, as the pressing-in force that cylinder is pressed into conical pipe in cylinder suction port in chamber gas force and compressor assembly process is by compression done the used time, cylinder and upper bearing (metal) or lower bearing easily misplace, now this solution also can cause vane slot distortion to worsen, compressor operation reliability decrease.

Summary of the invention

The present invention is intended to solve at least to a certain extent one of technical problem in correlation technique.

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

Another object of the present invention is to propose a kind of duplex-cylinder rotary compressor, reduces the torsional deformation of the vane slot of the first cylinder.

According to the single cylinder rotary compressor of the embodiment of the present invention, comprising: cylinder, described cylinder is provided with multiple the first tapped holes; Upper bearing (metal), described upper bearing (metal) be located at described cylinder above; Lower bearing, described lower bearing is located at below described cylinder; Multiple the first screws, described multiple the first screw respectively with described multiple the first tapped holes corresponding matching one by one, the part in described multiple the first screws coordinates that with a part for described multiple the first tapped holes described upper bearing (metal) is fixed on described cylinder through described upper bearing (metal); Remaining part in described multiple the first screw coordinates that with the remaining part in described multiple the first tapped holes described lower bearing is fixed on described cylinder through described lower bearing.

According to the single cylinder rotary compressor of the embodiment of the present invention, by making the part in multiple the first screws coordinate that with a part for multiple the first tapped holes upper bearing (metal) is fixed on cylinder through upper bearing (metal).Remaining part in multiple the first screws coordinates that with the remaining part in multiple the first tapped holes lower bearing is fixed on cylinder through lower bearing, thereby improve cylinder to acting on the resistivity of the lateral force on cylinder, can improve the connection reliability between upper bearing (metal) and cylinder, cylinder and lower bearing, and can resist its pressuring action to cylinder of the first screw, the torsional deformation of the vane slot of cylinder is reduced.

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

In some embodiments of the invention, on described cylinder, be also provided with the first screwing through hole, described single cylinder rotary compressor also comprises the second screw, and described the second screw tightens together described upper bearing (metal), described cylinder and described lower bearing through the first screwing through hole on described cylinder.

According to some embodiments of the present invention, the length of action L between each described the first screw and corresponding described the first tapped hole meets following formula:

$L\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the first screw, and d is the screw thread nominal diameter of described the first screw, σ _sfor the yield strength of described the first screw, K is each described the first screw and corresponding moment coefficient corresponding to described the first tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the first screw,

for the lead angle of described the first screw, ρ _vfor the screw thread equivalent friction angle of described the first screw, μ be the head of described the first screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the first screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the first screw.Thereby can guarantee to there is enough joggle numbers between the first tapped hole and corresponding the first screw, with the reliability of guaranteeing to be threaded.

In the preferred embodiments of the present invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the first tapped holes of described cylinder.Thereby it is excessive to avoid influencing each other between each the first tapped hole, guarantee the reliability being threaded.

In examples more of the present invention, a described part for described multiple the first screws and the described remaining part of described multiple the first screws are interspersed.

According to the duplex-cylinder rotary compressor of the embodiment of the present invention, comprising: the first cylinder and the second cylinder, described the first cylinder is positioned at the top of described the second cylinder, and described the first cylinder is provided with multiple the second tapped holes; Central diaphragm, described central diaphragm is located between described the first cylinder and described the second cylinder; Upper bearing (metal), described upper bearing (metal) be located at described the first cylinder above; Lower bearing, described lower bearing is located at below described the second cylinder; Multiple the 3rd screws, described multiple the 3rd screw respectively with described multiple the second tapped holes corresponding matching one by one, a part in described multiple the 3rd screw coordinates with the part in described multiple the second tapped holes through described upper bearing (metal), and the remaining part in described multiple the 3rd screws coordinates with the remaining part in described multiple the second tapped holes through described lower bearing, the second cylinder and central diaphragm.

According to the duplex-cylinder rotary compressor of the embodiment of the present invention, by the part in multiple the 3rd screws is coordinated with the part in multiple the second tapped holes through upper bearing (metal), remaining part in multiple the 3rd screws is through lower bearing, the second cylinder and central diaphragm coordinate with the remaining part in multiple the second tapped holes, thereby can improve the first cylinder to acting on the resistivity of the lateral force on the first cylinder, guarantee the connection reliability between the first cylinder and upper bearing (metal), and guarantee the first cylinder, central diaphragm, connection reliability between the second cylinder and lower bearing, be conducive to the torsional deformation of the vane slot that reduces by the first cylinder simultaneously.

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

In some embodiments of the invention, the length of action L1 between each described the 3rd screw and corresponding described the second tapped hole meets following formula:

$\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000467411330000011.png,HDA0000467411330000032.png"\; state="\{\{state\}\}">L</figure-callout>}1\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 3rd screw, and d is the screw thread nominal diameter of described the 3rd screw, σ _sfor the yield strength of described the 3rd screw, K is each described the 3rd screw and corresponding moment coefficient corresponding to described the second tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 3rd screw,

for the lead angle of described the 3rd screw, ρ _vfor the screw thread equivalent friction angle of described the 3rd screw, μ be the head of described the 3rd screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 3rd screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 3rd screw.Thereby between the second tapped hole on assurance the first cylinder and corresponding the 3rd screw, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the second tapped holes of described the first cylinder.Thereby by guaranteeing the wall thickness between every two the second tapped holes on the first cylinder, avoid influencing each other between each the second tapped hole excessive, improve the reliability being threaded.

In examples more of the present invention, the described remaining part of a described part for described multiple the 3rd screws and described multiple the 3rd screws is interspersed.

According to some embodiments of the present invention, described the second cylinder is provided with multiple the 3rd tapped holes, described duplex-cylinder rotary compressor also comprises multiple the 4th screws, described multiple the 4th screw respectively with described multiple the 3rd tapped holes corresponding matching one by one, a part in described multiple the 4th screw coordinates with the part in described multiple the 3rd tapped holes through described lower bearing, and the remaining part in described multiple the 4th screws coordinates with the remaining part in described multiple the 3rd tapped holes through described upper bearing (metal), described the first cylinder and described central diaphragm.

According to the duplex-cylinder rotary compressor of the embodiment of the present invention, by the part in multiple the 4th screws is coordinated with the part in multiple the 3rd tapped holes through lower bearing, remaining part in multiple the 4th screws is through upper bearing (metal), the first cylinder and central diaphragm coordinate with the remaining part in multiple the 3rd tapped holes, thereby can improve the second cylinder to acting on the resistivity of the lateral force on the second cylinder, guarantee the connection reliability between the second cylinder and lower bearing, and guarantee upper bearing (metal), the first cylinder, connection reliability between central diaphragm and the second cylinder, be conducive to the torsional deformation of the vane slot that reduces by the second cylinder simultaneously.

According to some embodiments of the present invention, on described the first cylinder, be also provided with the second screwing through hole, described duplex-cylinder rotary compressor also comprises the 5th screw, and described the 5th screw tightens together described upper bearing (metal), described the first cylinder and described central diaphragm through the second screwing through hole on described the first cylinder.

In some embodiments of the invention, the length of action L2 between each described the 4th screw and corresponding described the 3rd tapped hole meets following formula:

$\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">L</figure-callout>}2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 4th screw, and d is the screw thread nominal diameter of described the 4th screw, σ _sfor the yield strength of described the 4th screw, K is each described the 4th screw and corresponding moment coefficient corresponding to described the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 4th screw,

for the lead angle of described the 4th screw, ρ _vfor the screw thread equivalent friction angle of described the 4th screw, μ be the head of described the 4th screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 4th screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 4th screw.Thereby between the 3rd tapped hole on assurance the second cylinder and corresponding the 4th screw, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of described the second cylinder.Thereby by guaranteeing the wall thickness between every two the 3rd tapped holes on the second cylinder, avoid influencing each other between each the 3rd tapped hole excessive, improve the reliability being threaded.

According to some embodiments of the present invention, on described the second cylinder, be also provided with the 3rd screwing through hole, described duplex-cylinder rotary compressor also comprises the 6th screw, and described the 6th screw tightens together described lower bearing, described the second cylinder and described central diaphragm through the 3rd screwing through hole on described the second cylinder.

According to the duplex-cylinder rotary compressor of the embodiment of the present invention, comprising: the first cylinder and the second cylinder, described the first cylinder is positioned at the top of described the second cylinder, and described the second cylinder is provided with multiple the 3rd tapped holes; Central diaphragm, described central diaphragm is located between described the first cylinder and described the second cylinder; Upper bearing (metal), described upper bearing (metal) be located at described the first cylinder above; Lower bearing, described lower bearing is located at below described the second cylinder; Multiple the 4th screws, multiple described the 4th screws respectively with described multiple the 3rd tapped holes corresponding matching one by one, a part in described multiple the 4th screw coordinates with the part in described multiple the 3rd tapped holes through described lower bearing, and the remaining part in described multiple the 4th screws coordinates with the remaining part in described multiple the 3rd tapped holes through described upper bearing (metal), described the first cylinder and described central diaphragm.

According to the duplex-cylinder rotary compressor of the embodiment of the present invention, by the part in multiple the 4th screws is coordinated with the part in multiple the 3rd tapped holes through lower bearing, remaining part in multiple the 4th screws is through upper bearing (metal), the first cylinder and central diaphragm coordinate with the remaining part in multiple the 3rd tapped holes, thereby can improve the second cylinder to acting on the resistivity of the lateral force on the second cylinder, guarantee the connection reliability between the second cylinder and lower bearing, and guarantee upper bearing (metal), the first cylinder, connection reliability between central diaphragm and the second cylinder, be conducive to the torsional deformation of the vane slot that reduces by the second cylinder simultaneously.

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

In some embodiments of the invention, the length of action L2 between each described the 4th screw and corresponding described the 3rd tapped hole meets following formula:

$\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">L</figure-callout>}2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 4th screw, and d is the screw thread nominal diameter of described the 4th screw, σ _sfor the yield strength of described the 4th screw, K is each described the 4th screw and corresponding moment coefficient corresponding to described the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 4th screw, for the lead angle of described the 4th screw, ρ _vfor the screw thread equivalent friction angle of described the 4th screw, μ be the head of described the 4th screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 4th screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 4th screw.Thereby between the 3rd tapped hole on assurance the second cylinder and corresponding the 4th screw, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of described the second cylinder.Thereby by guaranteeing the wall thickness between every two the 3rd tapped holes on the second cylinder, avoid influencing each other between each the 3rd tapped hole excessive, improve the reliability being threaded.

In some embodiments of the invention, on described the second cylinder, be also provided with the 3rd screwing through hole, described duplex-cylinder rotary compressor also comprises the 6th screw, and described the 6th screw tightens together described lower bearing, described the second cylinder and described central diaphragm through the 3rd screwing through hole on described the second cylinder.

Accompanying drawing explanation

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

Fig. 2 is the plan view that the compression member portion attachment screw in the single cylinder rotary compressor shown in Fig. 1 distributes;

Fig. 3 is the free-body diagram of the cylinder in the single cylinder rotary compressor shown in Fig. 1 while being subject to lateral forces;

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

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

Fig. 6 is cylinder tapped hole force simplified plotted curve vertically;

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

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

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

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

Figure 11 is the plan view that the compression member portion attachment screw shown in Figure 10 distributes.

Reference character:

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

Embodiment

Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment who is described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.

Describe according to the single cylinder rotary compressor 100 of the embodiment of the present invention below with reference to Fig. 1-Fig. 7, it should be noted that, the working principle of single cylinder rotary compressor 100 etc. is those skilled in the art to be known, and is not just described in detail here.

According to the single cylinder rotary compressor 100 of the embodiment of the present invention, comprising: cylinder 1, upper bearing (metal) 2, lower bearing 3 and multiple the first screw 4, 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 the first tapped holes (scheming not shown), is also provided with vane slot 14 for assembling slide plate (scheming not shown) and for assembling the suction port 13 of conical pipe 12 on cylinder 1.Upper bearing (metal) 2 be located at cylinder 1 above.Lower bearing 3 is located at below cylinder 1, and upper bearing (metal) 2, cylinder 1 and lower bearing 3 limit the active chamber of cylinder 1.

Multiple the first screws 4 respectively with multiple the first tapped holes corresponding matching one by one, the part in multiple the first screws 4 coordinates that with a part for multiple the first tapped holes upper bearing (metal) 2 is fixed on cylinder 1 through upper bearing (metal) 2.Remaining part in multiple the first screws 4 coordinates that with the remaining part in multiple the first tapped holes lower bearing 3 is fixed on cylinder 1 through lower bearing 3.That is to say, first tapped hole coordinates with first screw 4, the first screw 4 that connects upper bearing (metal) 2 and cylinder 1 is connected to the first tapped hole on cylinder 1, and this first tapped hole does not coordinate with other any first screws 4, the first screw 4 that connects lower bearing 3 and cylinder 1 is connected to the first tapped hole on cylinder 1, and this first tapped hole does not coordinate with other any first screws 4.

Particularly, multiple the first screws 4 comprise at least one first sub-screw 4a and at least one second sub-screw 4b, wherein at least one first sub-screw 4a coordinates that with part the first tapped hole in multiple the first tapped holes upper bearing (metal) 2 is fixed on cylinder 1 respectively, and at least one second sub-screw 4b coordinates that with remaining part the first tapped hole in multiple the first tapped holes lower bearing 3 is fixed on cylinder 1 respectively.Wherein, the first tapped hole that each the first sub-screw 4a is corresponding does not coordinate with other any screws 4, and the first tapped hole that each the second sub-screw 4b is corresponding does not coordinate with other any screws 4.As shown in Figure 2, what in figure, solid line represented is the first sub-screw 4a from the first urgent screw 4(of upper bearing (metal) 2), that in figure, dotted line represents is the first screw 4(i.e. second sub-screw 4b urgent from lower bearing 3), all all be connected to difference the first tapped hole cylinder 1 from the urgent screw 4 of upper bearing (metal) 2 with from the first urgent screw 4 of lower bearing 3, thereby can meet the highly little requirement of cylinder 1 of single cylinder rotary compressor 100.

In the example of Fig. 2, the remaining part of a part for multiple the first screws 4 and multiple the first screws 4 is interspersed.That is to say, at least one first sub-screw 4a and at least one second sub-screw 4b are interspersed.

After the long-time shutdown of air-conditioning system, the lubricant oil in refrigerant and compressor in system will be deposited on compressor bottom, even progress in the active chamber of cylinder 1, and now system starts and may form " hydraulic compression ".In compressor operating, during in bad working environments such as " hydraulic compressions ", the reliability that the compression member portion of compressor connects seems particularly important, otherwise may cause the dislocation of cylinder 1 and upper bearing (metal) 2 and lower bearing 3, causes compressor card cylinder and scraps.The Placement of relatively traditional cylinder through hole, the ability enhancing that the present embodiment cylinder 1 bears lateral force can reach more than 50%.Free-body diagram when being illustrated in figure 3 the present embodiment cylinder 1 and being subject to lateral forces.In cylinder 1 operation process, be subject to gas force or be pressed into the lateral force F such as power when conical pipe 12 is pressed into the suction port 13 of cylinder 1 in assembly process _{side direction}do the used time, remove upper bearing (metal) 2 and lower bearing 3 and provide respectively frictional force f at cylinder 1 end face _{upper bearing (metal)}and f _{lower bearing}outward, relatively traditional cylinder 1 through hole mode, the screw 4 that is respectively connected to the tapped hole of cylinder 1 in the present embodiment also will provide directed force F _screwthereby, greatly strengthened the reliability that compression member portion connects.

On the other hand, vane slot 14 parts of cylinder 1 are subject to upper bearing (metal) 2 and the impacting force of lower bearing 3 to cylinder 1, make vane slot 14 both sides produce torsional deformation, especially vane slot 14 suction side because suction port 13 is to the weakening of local stiffness, torsional deformation is even more serious.The torsional deformation of vane slot 14 both sides of cylinder 1 has reduced the reliability of vane motion, and makes the frictional force of slide plate both sides or leak to increase.Fig. 4 is vane slot 14 local pressures and the vane slot 14 torsional deformation schematic diagram of the present embodiment cylinder 1.The relatively design of industry cylinder through hole, according to the single cylinder rotary compressor 100 of the embodiment of the present invention by the tapped hole that connects the first screw 4 is arranged on cylinder 1, the directed force F of the tapped hole of the first screw 4 to cylinder 1 _{upper bearing (metal) screw}, F _{lower bearing screw}the impacting force F to cylinder 1 with upper bearing (metal) 2 and lower bearing 3 respectively _{on bearing}and F _{lower bearing}opposite direction, can resist its pressuring action to cylinder 1, and the torsional deformation of the vane slot 14 of cylinder 1 is reduced.

According to the single cylinder rotary compressor 100 of the embodiment of the present invention, by making the part in multiple the first screws 4 coordinate that with a part for multiple the first tapped holes upper bearing (metal) 2 is fixed on cylinder 1 through upper bearing (metal) 2.Remaining part in multiple the first screws 4 coordinates that with the remaining part in multiple the first tapped holes lower bearing 3 is fixed on cylinder 1 through lower bearing 3, thereby improve cylinder 1 to acting on the resistivity of the lateral force on cylinder 1, can improve the connection reliability between upper bearing (metal) 2 and cylinder 1, cylinder 1 and lower bearing 3, and can resist first screw 4 its pressuring actions to cylinder 1, the torsional deformation of the vane slot 14 of cylinder 1 is reduced.

Fig. 5 is the first screw 4 linkage structures and sizing specification figure, and the supporting surface wherein contacting with the first screw 4 heads is likely baffler or bearing surface, depending on actual conditions.General by torque spanner method control the first screw 4 pretightening forces in compressor industry, urgent wrench torque T is used for overcoming screw pair resisting moment T ₁and the first end-face friction moment T between screw 4 heads and supporting surface ₂:

Wherein, F is screw pretightening force, and d is the screw thread nominal diameter of the first screw 4, d ₂be the effective diameter of thread of the first screw 4, be the lead angle of the first screw 4, ρ _vbe the screw thread equivalent friction angle of the first screw 4, μ be the first screw 4 heads with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the first screw 4 heads and the circular contact area of the supporting surface formation contacting with it, as Fig. 5, if when contact area outward edge is non-circular, can be converted to actual outward edge shape the circle of homalographic, obtains equivalent D _wcalculus of approximation.K is the first tapped hole of cylinder 1 and the moment coefficient of the first screw 4 correspondences, can be obtained by formula (1):

Count screw thread for single line, lead angle with pitch P and effective diameter of thread d ₂pass be:

Screw thread equivalent friction angle ρ _vwith screw thread equivalent friction factor μ _vpass be:

ρ _v＝arctanμ _v (4)

For convenience of description, as shown in Figure 5, a circle screw thread of initial point O place engagement is defined as to the 1st button thread engagement, increases progressively successively along X-axis direction thread engagement sequence number, L is the first screw 4 and cylinder 1 first tapped hole length of action.After the first screw 4 is urgent, the 1st buckles the stressed maximum of screw thread, along with the increase of thread engagement sequence number, respectively detains stressed non-linear the reducing of screw thread.Simplify in analysis, can think and the stressed linear change of each button screw thread have higher precision in worm tooth carrying inefficacy decision analysis, the each worm tooth shearing stress of linear simplifiation stress model and actual shearing stress contrast as shown in Figure 6.The first screw 4 be positioned at X=L free surface place worm tooth root shearing stress be 0, the first screw 4 to be positioned at the axial internal force in initial point O place be the first screw 4 pretightening force F, according to linear simplifiation stress model, can obtain:

$F={\&Integral;}_0^L\mathrm{\&pi;d\&tau;}\left(x\right)\mathrm{dx}=\frac{1}{2}\mathrm{\&pi;dL\&tau;}\left(0\right)---\left(5\right)$

Wherein, τ (0) is that in linear simplifiation stress model, screw thread is positioned at initial point O place shearing stress.Worm tooth root is in three-dimensional stress state, but the first tapped bore is to much smaller compared with axial stress with circumferential stress, and according to the 3rd theory of strength, worm tooth root maximum shear stress must not exceed the maximum shear stress [τ] that material allows:

${\mathrm{\&tau;}}_{\max }=\mathrm{n\&tau;}\left(0\right)\&le;\left[\mathrm{\&tau;}\right]=\frac{{\mathrm{\&sigma;}}_s}{2}---\left(6\right)$

Wherein, σ _sbe the yield strength of the first screw 4, the safety coefficient of n for considering that worm tooth root stress is concentrated and aforesaid stresses state reduction is introduced, gets 2.The first tapped hole that combined type (1), (5), (6) can obtain on cylinder 1 should meet with the length of action L of the first screw 4 being connected with this first tapped hole:

$L\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}---\left(7\right)$

Particularly, in the present embodiment, adopt M6 single line to count coarse thread design, the first screw semi-finals degree grade is 12.9, and urgent moment T is 15Nm, and length of thread engagement (LE) is calculated as table 1.The present embodiment guarantees to be threaded to have enough joggle numbers by above-mentioned check calculating, effectively avoids worm tooth fracture failure.

Table 1

In other words,, in inventive embodiment, the length of action L between each the first screw 4 and corresponding the first tapped hole meets following formula:

$L\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of the first screw 4, and d is the screw thread nominal diameter of the first screw 4, σ _sbe the yield strength of the first screw 4, K is each the first screw 4 and moment coefficient corresponding to corresponding the first tapped hole, and K is limited by following formula:

Wherein, d ₂be the effective diameter of thread of the first screw 4,

be the lead angle of the first screw 4, ρ _vbe the screw thread equivalent friction angle of the first screw 4, μ be the head of the first screw 4 with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of the first screw 4 and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of the first screw 4.Thereby can guarantee to there is enough joggle numbers between the first tapped hole and corresponding the first screw 4, with the reliability of guaranteeing to be threaded.

In an embodiment of the present invention, all all be connected to difference the first tapped hole cylinder 1 from upper bearing (metal) side with from the first urgent screw 4 of lower bearing side, be that at least one first sub-screw 4a and at least one second sub-screw 4b are connected to respectively difference the first tapped hole on cylinder 1, thereby can cause the first tapped hole quantity on cylinder 1 to increase, the reliability that now safe distance between the first tapped hole connects for the first screw 4 seems most important.Fig. 7 is minimum wall thickness (MINI W.) h plotted curve between the first tapped hole radial deformation-the first tapped hole.Visible along with the reducing of wall thickness h between two the first tapped holes, the impact between them increases gradually, and sharply increases after wall thickness h is less than 3mm, and the screw of different nominal diameters has all shown this rule.In the time that screw pretightening force is identical with minimum wall thickness (MINI W.) h between two the first tapped holes, along with the increase of nominal diameter, between two the first tapped holes, impact slightly increases.The reliability excessive for fear of influencing each other between each the first tapped hole, assurance is threaded, in a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the first tapped holes of cylinder 1.That is to say the minimum wall thickness (MINI W.) h >=3mm between other first tapped holes on each the first tapped hole and this cylinder 1 on cylinder 1.

In some embodiments of the invention, on cylinder 1, be also provided with the first screwing through hole (scheming not shown), single cylinder rotary compressor 100 also comprises the second screw (scheming not shown), and the second screw tightens together upper bearing (metal) 2, cylinder 1 and lower bearing 3 through the first screwing through hole on cylinder 1.That is to say, between cylinder 1, upper bearing (metal) 2 and lower bearing 3, except adopting the Placement that the first screw coordinates one by one with the first tapped hole, can also adopt the Placement coordinating of second screw and the first screwing through hole simultaneously.Wherein, the first screw can be that the tapped hole being fixedly attached on upper bearing (metal) 2 can be also the tapped hole being fixedly attached on lower bearing 3.

It should be noted that, the invention is not restricted to this, according to the single cylinder rotary compressor of the embodiment of the present invention, as long as guaranteeing on following basis: have at least the first screw that connects upper bearing (metal) and cylinder to be connected to the first tapped hole on cylinder, and this first tapped hole is not connected with other any first screws, simultaneously, have at least the screw of a connection lower bearing and cylinder to be connected to the first tapped hole on cylinder, and this first tapped hole is not connected with other any first screws, the upper bearing (metal) of the single cylinder rotary compressor of the embodiment of the present invention, between cylinder and lower bearing, can also adopt any Placement.

The duplex-cylinder rotary compressor 200 of describing three embodiments according to the present invention below with reference to Fig. 8-Figure 11, wherein, the working principle of duplex-cylinder rotary compressor 200 etc. is those skilled in the art to be known, and is not just 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 comprises: the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3, multiple the 3rd screw 10 and multiple the 4th screw 11.Wherein, the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3, multiple the 3rd screw 10 and multiple the 4th screw 11 construct the compression member portion of duplex-cylinder rotary compressor 200.

The first cylinder 5 is positioned at the top of the second cylinder 6, the first cylinder 5 is provided with multiple the second tapped holes (scheming not shown), the second cylinder 6 is provided with multiple the 3rd tapped holes (scheming not shown), and on the first cylinder 5 and the second cylinder 6, is respectively equipped with vane slot 14 for assembling slide plate and for assembling the suction port 13 of conical pipe 12.

Central diaphragm 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 be located at the first cylinder 5 above, between upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7, limit the active chamber of the first cylinder 5.Lower bearing 3 is located at below the second cylinder 6, limits the active chamber of the second cylinder 6 between central diaphragm 7, the second cylinder 6 and lower bearing 3.

Multiple the 3rd screws 10 respectively with multiple the second tapped holes corresponding matching one by one, a part in multiple the 3rd screws 10 coordinates with the part in multiple the second tapped holes through upper bearing (metal) 2, and the remaining part in multiple the 3rd screws 10 coordinates with the remaining part in multiple the second tapped holes through lower bearing 3, the second cylinder 6 and central diaphragm 7.That is to say, corresponding the 3rd screw 10 of each the second tapped hole, the 3rd screw 10 that connects upper bearing (metal) 2 and the first cylinder 5 is connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10.The 3rd screw 10 that connects lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 is connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10.

Particularly, multiple the 3rd screws 10 comprise at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b, the 3rd sub-screw 10a is connected to part the second tapped hole on the first cylinder 5 upper bearing (metal) 2 is fixed on the first cylinder 5 through upper bearing (metal) 2, the 4th sub-screw 10b is through lower bearing 3, the second cylinder 6 and central diaphragm 7 are connected to remaining part the second tapped hole on the first cylinder 5 with by lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 are fixed together, wherein, the second tapped hole that each the 3rd sub-screw 10a is corresponding does not coordinate with other any the 3rd screws 10, the second tapped hole that each the 4th sub-screw 10b is corresponding does not coordinate with other any the 3rd screws 10.

Multiple the 4th screws 11 respectively with multiple the 3rd tapped holes corresponding matching one by one, a part in multiple the 4th screws 11 coordinates with the part in multiple the 3rd tapped holes through lower bearing 3, and the remaining part in multiple the 4th screws 11 coordinates with the remaining part in multiple the 3rd tapped holes through upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7.That is to say, each the 3rd tapped hole coordinates with the 4th screw 11, the 4th screw 11 that connects lower bearing 3 and the second cylinder 6 is connected to part the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11, simultaneously, the 4th screw 11 that connects upper bearing (metal) 2, the second cylinder 6, central diaphragm 7 and the first cylinder 5 is connected to remaining part the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11.

Particularly, multiple the 4th screws 11 comprise 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 with part the 3rd tapped hole on the second cylinder 6 through lower bearing 3, at least one the 6th sub-screw 11b is successively through upper bearing (metal) 2, the first cylinder 5 is connected with remaining part the 3rd tapped hole on the second cylinder 6 with central diaphragm 7, wherein, the 3rd tapped hole that each the 5th sub-screw 11a is corresponding does not coordinate with other any the 4th screws 11, the 3rd tapped hole that each the 6th sub-screw 11b is corresponding does not coordinate with other any the 4th screws 11.

Fig. 9 is the plan view that presentation graphs 8 compression member portion attachment screws distribute, what in figure, solid line represented is three screw 10 urgent from upper bearing (metal) side, what dotted line represented is three screw 10 urgent from lower bearing side, can meet the little requirement of cylinder height of duplex-cylinder rotary compressor 200.In the present embodiment, have the 3rd screw 10 of two connection upper bearing (metal)s 2 and the first cylinder 5 to be connected to the second tapped hole (having two the 3rd sub-screw 10a to be connected to the second tapped hole) on the first cylinder 5, and the second tapped hole is not connected with other any screws.Have the 3rd screw 10 of three connection lower bearings 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 to be connected to the second tapped hole (having three the 4th sub-screw 10b to be connected to the second tapped hole) on the first cylinder 5, and this second tapped hole is not connected with other any screws.Have the 4th screw 11 of two connection lower bearings 3 and the second cylinder 6 to be connected to the 3rd tapped hole (having two the 5th sub-screw 11a to be connected to the 3rd tapped hole) on the second cylinder 6, and the 3rd tapped hole is not connected with other any screws.Have the 4th screw 11 of three connection upper bearing (metal)s 2, the first cylinder 5, central diaphragm 7 and the second cylinder 6 to be connected to the 3rd tapped hole (having three the 6th sub-screw 11b to be connected to the 3rd tapped hole) on the second cylinder 6, and the 3rd tapped hole is not connected with other any screws.

Wherein, it should be noted that, 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 according to the stressing conditions of the first cylinder 5 of the duplex-cylinder rotary compressor 200 of the embodiment of the present invention and the second cylinder 6, be just not described in detail here.

According to the duplex-cylinder rotary compressor 200 of the embodiment of the present invention, can improve the first cylinder 5 and the second cylinder 6 to being applied to the resistivity of the lateral force on the first cylinder 5 and the second cylinder 6 simultaneously, guarantee the reliability that compression member portion connects, be conducive to reduce the torsional deformation of the 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 the length of action between design principle, the 4th screw 11 and the 3rd tapped hole of the length of action between the 3rd screw 10 and the second tapped hole, each second tapped hole of the first cylinder 5, each the 3rd tapped hole of the second cylinder 6 all with single cylinder rotary compressor 100 according to the above embodiment of the present invention in similar, just repeat no more here.

Therefore, in some embodiments of the invention, the length of action L1 between each the 3rd screw 10 and corresponding the second tapped hole meets following formula:

$\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000467411330000011.png,HDA0000467411330000032.png"\; state="\{\{state\}\}">L</figure-callout>}1\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of the 3rd screw 10, and d is the screw thread nominal diameter of the 3rd screw 10, σ _sbe the yield strength of the 3rd screw 10, K is each the 3rd screw 10 and moment coefficient corresponding to corresponding the second tapped hole, and K is limited by following formula:

Wherein, d ₂be the effective diameter of thread of the 3rd screw 10,

be the lead angle of the 3rd screw 10, ρ _vbe the screw thread equivalent friction angle of the 3rd screw 10, μ be the head of the 3rd screw 10 with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of the 3rd screw 10 and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of the 3rd screw 10.Thereby between the second tapped hole on assurance the first cylinder 5 and corresponding the 3rd screw 10, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the second tapped holes of the first cylinder 5.That is to say the minimum wall thickness (MINI W.) h >=3mm between other second tapped holes on each the second tapped hole and the first cylinder 5 on the first cylinder 5.Thereby by guaranteeing the wall thickness between every two the second tapped holes on the first cylinder 5, avoid influencing each other between each the second tapped hole excessive, improve the reliability being threaded.

According to some embodiments of the present invention, the length of action L2 between each the 4th screw 11 and corresponding the 3rd tapped hole meets following formula:

$\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">L</figure-callout>}2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of the 4th screw 11, and d is the screw thread nominal diameter of the 4th screw 11, σ _sbe the yield strength of the 4th screw 11, K is each the 4th screw 11 and moment coefficient corresponding to corresponding the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂be the effective diameter of thread of the 4th screw 11,

be the lead angle of the 4th screw 11, ρ _vbe the screw thread equivalent friction angle of the 4th screw 11, μ be the head of the 4th screw 11 with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of the 4th screw 11 and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of the 4th screw 11.Thereby between the 3rd tapped hole on assurance the second cylinder 6 and corresponding the 4th screw 11, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of the second cylinder 6.That is to say the minimum wall thickness (MINI W.) h >=3mm between other the 3rd tapped holes on each the 3rd tapped hole and the second cylinder 6 on the second cylinder 6.Thereby by guaranteeing the wall thickness between every two the 3rd tapped holes on the second cylinder 6, avoid influencing each other between each the 3rd tapped hole excessive, improve the reliability being threaded.

In some embodiments of the invention, on the first cylinder 5, be also provided with the second screwing through hole (scheming not shown), duplex-cylinder rotary compressor 200 also comprises the 5th screw (scheming not shown), and the 5th screw tightens together upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7 through the second screwing through hole on the first cylinder 5.

On the second cylinder 6, be also provided with the 3rd screwing through hole (scheming not shown), duplex-cylinder rotary compressor 200 also comprises the 6th screw (scheming not shown), and the 6th screw tightens together lower bearing 3, the second cylinder 6 and central diaphragm 7 through the 3rd screwing through hole on the second cylinder 6.

That is to say, between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and lower bearing 3 except adopting the Placement that the second tapped hole coordinates one by one with the 3rd screw 10 and the 3rd tapped hole coordinates one by one with the 4th screw 11, can also adopt the Placement of the second screwing through hole and the 5th screw fit simultaneously, certainly can also adopt the Placement of the 3rd screwing through hole and the 6th screw fit simultaneously.

It should be noted that, the invention is not restricted to this, according to the duplex-cylinder rotary compressor of the embodiment of the present invention, as long as guaranteeing on following basis: have at least the 3rd screw 10 that connects upper bearing (metal) 2 and the first cylinder 5 to be connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10; Have at least the 3rd screw 10 of a connection lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 to be connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10; Have at least the 4th screw 11 of a connection lower bearing 3 and the second cylinder 6 to be connected to the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11; Have at least the 4th screw 11 of a connection upper bearing (metal) 2, the first cylinder 5, central diaphragm 7 and the second cylinder 6 to be connected to the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11.Between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and the lower bearing 3 of the duplex-cylinder rotary compressor of the embodiment of the present invention, can also adopt any Placement.

In some cases, in duplex-cylinder rotary compressor 200, a cylinder connection reliability requires higher than another cylinder, such as the design that has a cylinder height apparently higher than another cylinder in variable volume compressor, this by cause cylinder that cylinder height is higher under identical working condition, be subject to gas side to power far above another cylinder, this just requires to lay particular stress on to some extent in design, is applicable to above-mentioned application in embodiment 2 disclosed in the following description of the invention and embodiment 3.

Embodiment 2:

In this embodiment, suppose that the first cylinder 5 connection reliability have relatively high expectations, requirement is lower for the second cylinder 6, as shown in figure 10, according to the duplex-cylinder rotary compressor 200 of the embodiment of the present invention, comprising: the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3 and multiple the 3rd screw 10.Wherein, the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3 and multiple the 3rd screw 10 construct the compression member portion of duplex-cylinder rotary compressor 200.

The first cylinder 5 is positioned at the top of the second cylinder 6, and the first cylinder 5 is provided with multiple the second tapped holes, and on the first cylinder 5 and the second cylinder 6, is respectively equipped with vane slot 14 for assembling slide plate and for assembling the suction port 13 of conical pipe 12.

Central diaphragm 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 be located at the first cylinder 5 above, between upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7, limit the active chamber of the first cylinder 5.Lower bearing 3 is located at below the second cylinder 6, limits the active chamber of the second cylinder 6 between central diaphragm 7, the second cylinder 6 and lower bearing 3.

Multiple the 3rd screws 10 respectively with multiple the second tapped holes corresponding matching one by one, a part in multiple the 3rd screws 10 coordinates with the part in multiple the second tapped holes through upper bearing (metal) 2, and the remaining part in multiple the 3rd screws 10 coordinates with the remaining part in multiple the second tapped holes through lower bearing 3, the second cylinder 6 and central diaphragm 7.That is to say, corresponding the 3rd screw 10 of each the second tapped hole, the 3rd screw 10 that connects upper bearing (metal) 2 and the first cylinder 5 is connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10.The 3rd screw 10 that connects lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 is connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10.

Particularly, multiple the 3rd screws 10 comprise at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b, the 3rd sub-screw 10a is connected to part the second tapped hole on the first cylinder 5 upper bearing (metal) 2 is fixed on the first cylinder 5 through upper bearing (metal) 2, the 4th sub-screw 10b is through lower bearing 3, the second cylinder 6 and central diaphragm 7 are connected to remaining part the second tapped hole on the first cylinder 5 with by lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 are fixed together, wherein, the second tapped hole that each the 3rd sub-screw 10a is corresponding does not coordinate with other any the 3rd screws 10, the second tapped hole that each the 4th sub-screw 10b is corresponding does not coordinate with other any the 3rd screws 10.As shown in figure 11, in figure, solid line represents from the urgent screw of upper bearing (metal) 2 (i.e. the 3rd sub-screw 10a), what in figure, dotted line represented is the screw (i.e. four sub-screw 10b) urgent from lower bearing 3, all all be connected to difference the second tapped hole the first cylinder 5 from the urgent screw of upper bearing (metal) 2 with from the urgent screw of lower bearing 3, thereby can meet the little requirement of cylinder height of duplex-cylinder rotary compressor 200.

In the example depicted in fig. 11, the remaining part of a part for multiple the 3rd screws 10 and multiple the 3rd screws 10 is interspersed, and that is to say, at least one the 3rd sub-screw 10a and at least one the 4th sub-screw 10b are interspersed.

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

According to the duplex-cylinder rotary compressor 200 of the embodiment of the present invention, by the part in multiple the 3rd screws 10 is coordinated with the part in multiple the second tapped holes through upper bearing (metal) 2, remaining part in multiple the 3rd screws 10 is through lower bearing 3, the second cylinder 6 and central diaphragm 7 coordinate with the remaining part in multiple the second tapped holes, thereby can improve the first cylinder 5 to acting on the resistivity of the lateral force on the first cylinder 5, guarantee the connection reliability between the first cylinder 5 and upper bearing (metal) 2, and guarantee the first cylinder 5, central diaphragm 7, connection reliability between the second cylinder 6 and lower bearing 3, be conducive to the torsional deformation of the vane slot 14 that reduces by the first cylinder 5 simultaneously.

In this embodiment, the second cylinder 6 can adopt cylinder via design completely, for the consideration that reduces assembly technology difficulty, two Screws be can design in addition and lower bearing 3 and the second cylinder 6 connected, when assembling, first distinguish fastening lower bearing 3 and the second cylinder 6, upper bearing (metal) 2 and the first cylinder 5, then tighten together with miscellaneous parts such as central diaphragms 7.

Wherein, it should be noted that, minimum wall thickness (MINI W.) design principle between the design principle of the length of action between the 3rd screw 10 and the second tapped hole, each second tapped hole of the first cylinder 5 all with single cylinder rotary compressor 100 according to the above embodiment of the present invention in similar, just repeat no more here.

Therefore,, according to some embodiments of the present invention, the length of action L1 between each the 3rd screw 10 and corresponding the second tapped hole meets following formula:

$\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000467411330000011.png,HDA0000467411330000032.png"\; state="\{\{state\}\}">L</figure-callout>}1\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of the 3rd screw 10, and d is the screw thread nominal diameter of the 3rd screw 10, σ _sbe the yield strength of the 3rd screw 10, K is each the 3rd screw 10 and moment coefficient corresponding to corresponding the second tapped hole, and K is limited by following formula:

Wherein, d ₂be the effective diameter of thread of the 3rd screw 10, be the lead angle of the 3rd screw 10, ρ _vbe the screw thread equivalent friction angle of the 3rd screw 10, μ be the head of the 3rd screw 10 with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of the 3rd screw 10 and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of the 3rd screw 10.Thereby between the second tapped hole on assurance the first cylinder 5 and corresponding the 3rd screw 10, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the second tapped holes of the first cylinder 5.That is to say the minimum wall thickness (MINI W.) h >=3mm between other second tapped holes on each the second tapped hole and the first cylinder 5 on the first cylinder 5.Thereby by guaranteeing the wall thickness between every two the second tapped holes on the first cylinder 5, avoid influencing each other between each the second tapped hole excessive, improve the reliability being threaded.

In some embodiments of the invention, on the first cylinder 5, be also provided with the second screwing through hole (scheming not shown), duplex-cylinder rotary compressor 200 also comprises the 5th screw (scheming not shown), and the 5th screw tightens together upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7 through the second screwing through hole on the first cylinder 5.

That is to say, between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and lower bearing 3, except adopting the Placement that the second tapped hole coordinates one by one with the 3rd screw 10, can also adopt the Placement of the second screwing through hole and the 5th screw fit simultaneously.

It should be noted that, the invention is not restricted to this, according to the duplex-cylinder rotary compressor of the embodiment of the present invention, as long as guaranteeing on following basis: have at least the 3rd screw 10 that connects upper bearing (metal) 2 and the first cylinder 5 to be connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10; Have at least the 3rd screw 10 of a connection lower bearing 3, the second cylinder 6, central diaphragm 7 and the first cylinder 5 to be connected to the second tapped hole on the first cylinder 5, and this second tapped hole is not connected with other any the 3rd screws 10.Between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and the lower bearing 3 of the duplex-cylinder rotary compressor of the embodiment of the present invention, can also adopt any Placement.

Embodiment 3:

In this embodiment, the second cylinder 6 connection reliability are had relatively high expectations, and require lower to the connection reliability of the first cylinder 5.According to the duplex-cylinder rotary compressor 200 of the embodiment of the present invention, comprising: the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3 and multiple the 4th screw 11.Wherein, the first cylinder 5, the second cylinder 6, central diaphragm 7, upper bearing (metal) 2, lower bearing 3 and multiple the 4th screw 11 construct the compression member portion of duplex-cylinder rotary compressor 200.

The first cylinder 5 is positioned at the top of the second cylinder 6, and the second cylinder 6 is provided with multiple the 3rd tapped holes, and on the first cylinder 5 and the second cylinder 6, is respectively equipped with vane slot 14 for assembling slide plate and for assembling the suction port 13 of conical pipe 12.

Central diaphragm 7 is located between the first cylinder 5 and the second cylinder 6.Upper bearing (metal) 2 be located at the first cylinder 5 above, between upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7, limit the active chamber of the first cylinder 5.Lower bearing 3 is located at below the second cylinder 6, limits the active chamber of the second cylinder 6 between central diaphragm 7, the second cylinder 6 and lower bearing 3.

Multiple the 4th screws 11 respectively with multiple the 3rd tapped holes corresponding matching one by one, a part in multiple the 4th screws 11 coordinates with the part in multiple the 3rd tapped holes through lower bearing 3, and the remaining part in multiple the 4th screws 11 coordinates with the remaining part in multiple the 3rd tapped holes through upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7.That is to say, each the 3rd tapped hole coordinates with the 4th screw 11, the 4th screw 11 that connects lower bearing 3 and the second cylinder 6 is connected to part the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11, simultaneously, the 4th screw 11 that connects upper bearing (metal) 2, the second cylinder 6, central diaphragm 7 and the first cylinder 5 is connected to remaining part the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11.

Particularly, multiple the 4th screws 11 comprise 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 with part the 3rd tapped hole on the second cylinder 6 through lower bearing 3, at least one the 6th sub-screw 11b is successively through upper bearing (metal) 2, the first cylinder 5 is connected with remaining part the 3rd tapped hole on the second cylinder 6 with central diaphragm 7, wherein, the 3rd tapped hole that each the 5th sub-screw 11a is corresponding does not coordinate with other any the 4th screws 11, the 3rd tapped hole that each the 6th sub-screw 11b is corresponding does not coordinate with other any the 4th screws 11.As shown in Figure 9, in figure, solid line represents from the urgent screw of upper bearing (metal) 2 (i.e. the 5th sub-screw 11a), what in figure, dotted line represented is the screw (i.e. six sub-screw 11b) urgent from lower bearing 3, all all be connected to difference the 3rd tapped hole the second cylinder 6 from the urgent screw of upper bearing (metal) 2 with from the urgent screw of lower bearing 3, thereby can meet the little requirement of cylinder height of duplex-cylinder rotary compressor 200.

The remaining part of a part for multiple the 4th screws 11 and multiple the 4th screws 11 is interspersed.That is to say, at least one the 5th sub-screw 11a and at least one the 6th sub-screw 11b are interspersed.

Thereby, according to the duplex-cylinder rotary compressor 200 of the embodiment of the present invention, by the part in multiple the 4th screws 11 is coordinated with the part in multiple the 3rd tapped holes through lower bearing 3, remaining part in multiple the 4th screws 11 is through upper bearing (metal) 2, the first cylinder 5 and central diaphragm 7 coordinate with the remaining part in multiple the 3rd tapped holes, thereby can improve the second cylinder 6 to acting on the resistivity of the lateral force on the second cylinder 6, guarantee the connection reliability between the second cylinder 6 and lower bearing 3, and guarantee upper bearing (metal) 2, the first cylinder 5, connection reliability between central diaphragm 7 and the second cylinder 6, be conducive to the torsional deformation of the vane slot 14 that reduces by the second cylinder 6 simultaneously.

Wherein, it should be noted that, minimum wall thickness (MINI W.) design principle between the design principle of the length of action between the 4th screw 11 and the 3rd tapped hole, each the 3rd tapped hole of the second cylinder 6 all with single cylinder rotary compressor 100 according to the above embodiment of the present invention in similar, just repeat no more here.

Therefore,, according to some embodiments of the present invention, the length of action L2 between each the 4th screw 11 and corresponding the 3rd tapped hole meets following formula:

$\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">L</figure-callout>}2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA0000467411330000041.png,HDA0000467411330000051.png"\; state="\{\{state\}\}">d</figure-callout>}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of the 4th screw 11, and d is the screw thread nominal diameter of the 4th screw 11, σ _sbe the yield strength of the 4th screw 11, K is each the 4th screw 11 and moment coefficient corresponding to corresponding the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂be the effective diameter of thread of the 4th screw 11, be the lead angle of the 4th screw 11, ρ _vbe the screw thread equivalent friction angle of the 4th screw 11, μ be the head of the 4th screw 11 with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of the 4th screw 11 and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of the 4th screw 11.Thereby between the 3rd tapped hole on assurance the second cylinder 6 and corresponding the 4th screw 11, there is enough joggle numbers, and then guarantee the reliability being threaded.

In a preferred embodiment of the invention, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of the second cylinder 6.That is to say the minimum wall thickness (MINI W.) h >=3mm between other the 3rd tapped holes on each the 3rd tapped hole and the second cylinder 6 on the second cylinder 6.Thereby by guaranteeing the wall thickness between every two the 3rd tapped holes on the second cylinder 6, avoid influencing each other between each the 3rd tapped hole excessive, improve the reliability being threaded.

In some embodiments of the invention, on the second cylinder 6, be also provided with the 3rd screwing through hole (scheming not shown), duplex-cylinder rotary compressor 200 also comprises the 6th screw (scheming not shown), and the 6th screw tightens together lower bearing 3, the second cylinder 6 and central diaphragm 7 through the 3rd screwing through hole on the second cylinder 6.

That is to say, between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and lower bearing 3, except adopting the Placement that the 3rd tapped hole coordinates one by one with the 4th screw 11, can also adopt the Placement of the 3rd screwing through hole and the 6th screw fit simultaneously.

It should be noted that, the invention is not restricted to this, according to the duplex-cylinder rotary compressor of the embodiment of the present invention, as long as guaranteeing on following basis: have at least the 4th screw 11 of a connection lower bearing 3 and the second cylinder 6 to be connected to the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11; Have at least the 4th screw 11 of a connection upper bearing (metal) 2, the first cylinder 5, central diaphragm 7 and the second cylinder 6 to be connected to the 3rd tapped hole on the second cylinder 6, and the 3rd tapped hole is not connected with other any the 4th screws 11.Between upper bearing (metal) 2, the first cylinder 5, central diaphragm 7, the second cylinder 6 and the lower bearing 3 of the duplex-cylinder rotary compressor of the embodiment of the present invention, can also adopt any Placement.

Wherein, it should be noted that, according to other configuration examples of the single cylinder rotary compressor 100 of the embodiment of the present invention and duplex-cylinder rotary compressor 200 as structures such as piston, slide plate, liquid containers, be all prior art, and by those skilled in the art is known, be that these parts can design according to existing mode completely, just describe in detail no longer one by one here.

In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " 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 indications such as " circumferentially " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.

In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characteristics.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or integral; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly 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, can understand as the case may be above-mentioned term concrete meaning in the present invention.

In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic " 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, First Characteristic Second Characteristic " on ", " top " and " above " but First Characteristic directly over Second Characteristic or oblique upper, or only represent that First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " can be First Characteristic under Second Characteristic or tiltedly, or only represent that First Characteristic level height is less than Second Characteristic.

In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, to the schematic statement of above-mentioned term not must for be identical embodiment or example.And, specific features, structure, material or the feature of description can one or more embodiments in office or example in suitable mode combination.In addition,, not conflicting in the situation that, those skilled in the art can carry out combination and combination by the feature of the different embodiments that describe in this specification or example and different embodiment or example.

Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, modification, replacement and modification.

Claims (18)

1. a single cylinder rotary compressor, is characterized in that, comprising:

Cylinder, described cylinder is provided with multiple the first tapped holes;

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

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

Multiple the first screws, described multiple the first screw respectively with described multiple the first tapped holes corresponding matching one by one, the part in described multiple the first screws coordinates that with a part for described multiple the first tapped holes described upper bearing (metal) is fixed on described cylinder through described upper bearing (metal); Remaining part in described multiple the first screw coordinates that with the remaining part in described multiple the first tapped holes described lower bearing is fixed on described cylinder through described lower bearing.

2. single cylinder rotary compressor according to claim 1, it is characterized in that, on described cylinder, be also provided with the first screwing through hole, described single cylinder rotary compressor also comprises the second screw, and described the second screw tightens together described upper bearing (metal), described cylinder and described lower bearing through the first screwing through hole on described cylinder.

3. single cylinder rotary compressor according to claim 1, is characterized in that, the length of action L between each described the first screw and corresponding described the first tapped hole meets following formula:

$L\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;d}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the first screw, and d is the screw thread nominal diameter of described the first screw, σ _sfor the yield strength of described the first screw, K is each described the first screw and corresponding moment coefficient corresponding to described the first tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the first screw,

for the lead angle of described the first screw, ρ _vfor the screw thread equivalent friction angle of described the first screw, μ be the head of described the first screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the first screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the first screw.

4. single cylinder rotary compressor according to claim 1, is characterized in that, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the first tapped holes of described cylinder.

5. single cylinder rotary compressor according to claim 1, is characterized in that, a described part for described multiple the first screws and the described remaining part of described multiple the first screws are interspersed.

6. a duplex-cylinder rotary compressor, is characterized in that, comprising:

The first cylinder and the second cylinder, described the first cylinder is positioned at the top of described the second cylinder, and described the first cylinder is provided with multiple the second tapped holes;

Central diaphragm, described central diaphragm is located between described the first cylinder and described the second cylinder;

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

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

Multiple the 3rd screws, described multiple the 3rd screw respectively with described multiple the second tapped holes corresponding matching one by one, a part in described multiple the 3rd screw coordinates with the part in described multiple the second tapped holes through described upper bearing (metal), and the remaining part in described multiple the 3rd screws coordinates with the remaining part in described multiple the second tapped holes through described lower bearing, the second cylinder and central diaphragm.

7. duplex-cylinder rotary compressor according to claim 6, is characterized in that, the length of action L1 between each described the 3rd screw and corresponding described the second tapped hole meets following formula:

$L1\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;d}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 3rd screw, and d is the screw thread nominal diameter of described the 3rd screw, σ _sfor the yield strength of described the 3rd screw, K is each described the 3rd screw and corresponding moment coefficient corresponding to described the second tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 3rd screw, for the lead angle of described the 3rd screw, ρ _vfor the screw thread equivalent friction angle of described the 3rd screw, μ be the head of described the 3rd screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 3rd screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 3rd screw.

8. duplex-cylinder rotary compressor according to claim 6, is characterized in that, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the second tapped holes of described the first cylinder.

9. duplex-cylinder rotary compressor according to claim 6, is characterized in that, the described remaining part of a described part for described multiple the 3rd screws and described multiple the 3rd screws is interspersed.

10. duplex-cylinder rotary compressor according to claim 6, it is characterized in that, described the second cylinder is provided with multiple the 3rd tapped holes, described duplex-cylinder rotary compressor also comprises multiple the 4th screws, described multiple the 4th screw respectively with described multiple the 3rd tapped holes corresponding matching one by one, a part in described multiple the 4th screw coordinates with the part in described multiple the 3rd tapped holes through described lower bearing, remaining part in described multiple the 4th screw is through described upper bearing (metal), described the first cylinder and described central diaphragm coordinate with the remaining part in described multiple the 3rd tapped holes.

11. according to the duplex-cylinder rotary compressor described in claim 6 or 10, it is characterized in that, on described the first cylinder, be also provided with the second screwing through hole, described duplex-cylinder rotary compressor also comprises the 5th screw, and described the 5th screw tightens together described upper bearing (metal), described the first cylinder and described central diaphragm through the second screwing through hole on described the first cylinder.

12. duplex-cylinder rotary compressors according to claim 10, is characterized in that, the length of action L2 between each described the 4th screw and corresponding described the 3rd tapped hole meets following formula:

$L2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;d}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 4th screw, and d is the screw thread nominal diameter of described the 4th screw, σ _sfor the yield strength of described the 4th screw, K is each described the 4th screw and corresponding moment coefficient corresponding to described the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 4th screw,

for the lead angle of described the 4th screw, ρ _vfor the screw thread equivalent friction angle of described the 4th screw, μ be the head of described the 4th screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 4th screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 4th screw.

13. duplex-cylinder rotary compressors according to claim 10, is characterized in that, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of described the second cylinder.

14. duplex-cylinder rotary compressors according to claim 10, it is characterized in that, on described the second cylinder, be also provided with the 3rd screwing through hole, described duplex-cylinder rotary compressor also comprises the 6th screw, and described the 6th screw tightens together described lower bearing, described the second cylinder and described central diaphragm through the 3rd screwing through hole on described the second cylinder.

15. 1 kinds of duplex-cylinder rotary compressors, is characterized in that, comprising:

The first cylinder and the second cylinder, described the first cylinder is positioned at the top of described the second cylinder, and described the second cylinder is provided with multiple the 3rd tapped holes;

Central diaphragm, described central diaphragm is located between described the first cylinder and described the second cylinder;

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

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

Multiple the 4th screws, multiple described the 4th screws respectively with described multiple the 3rd tapped holes corresponding matching one by one, a part in described multiple the 4th screw coordinates with the part in described multiple the 3rd tapped holes through described lower bearing, and the remaining part in described multiple the 4th screws coordinates with the remaining part in described multiple the 3rd tapped holes through described upper bearing (metal), described the first cylinder and described central diaphragm.

16. duplex-cylinder rotary compressors according to claim 15, is characterized in that, the length of action L2 between each described the 4th screw and corresponding described the 3rd tapped hole meets following formula:

$L2\&GreaterEqual;\frac{8T}{{\mathrm{\&pi;d}}^2{\mathrm{K\&sigma;}}_s}$

Wherein, T is the urgent moment of described the 4th screw, and d is the screw thread nominal diameter of described the 4th screw, σ _sfor the yield strength of described the 4th screw, K is each described the 4th screw and corresponding moment coefficient corresponding to described the 3rd tapped hole, and K is limited by following formula:

Wherein, d ₂for the effective diameter of thread of described the 4th screw,

for the lead angle of described the 4th screw, ρ _vfor the screw thread equivalent friction angle of described the 4th screw, μ be the head of described the 4th screw with the supporting surface contacting with it between friction factor, D _wand d ₀the external diameter and the internal diameter that are respectively the head of described the 4th screw and the circular contact area of the supporting surface formation contacting with it, d is the screw thread nominal diameter of described the 4th screw.

17. duplex-cylinder rotary compressors according to claim 15, is characterized in that, the minimum wall thickness (MINI W.) h >=3mm of the part between every adjacent two the 3rd tapped holes of described the second cylinder.

18. duplex-cylinder rotary compressors according to claim 15, it is characterized in that, on described the second cylinder, be also provided with the 3rd screwing through hole, described duplex-cylinder rotary compressor also comprises the 6th screw, and described the 6th screw tightens together described lower bearing, described the second cylinder and described central diaphragm through the 3rd screwing through hole on described the second cylinder.

Images