CN2397283Y - High efficient static vortex dish for vortex compressor - Google Patents

Abstract

The utility model relates to a high efficient static vortex dish for vortex compressors, which comprises a base and a vortex body. An air vent position near the center of the vortex body is determined by an engagement throwing angle that * of a movable and a static vortex discs, and the that * can satisfy the following equation that *=phi< E >-pai/2-gamma = phi< E >-phi/2-beta-arctg (d alpha/alpha). The phi E in the formula is an involute final spread angle of the vortex body, the gamma is an included angle for correcting a circular arc center line and the X shaft, the beta is a correction angle, the d< a > is a distance for correcting a circle center to a base circle tangential point, and the alpha is a base radius of an involute of the static vortex disc.

Description

The efficient fixed scroll of scroll compressor

The utility model relates to a kind of fixed scroll of scroll compressor.

At present scroll compressor comes into the market as the high and new technology new product, and it has characteristics such as efficient height, good reliability, noise are low, has begun to be used for cabinet air-conditioner and car air conditioner.Scroll compressor mainly is made up of housing, moving scroll, fixed scroll and bent axle etc., and wherein fixed scroll and moving scroll are combined together, and realizes that by the revolution of moving scroll the engagement of dynamic and static scroll carries out gas compression.Fixed scroll is made up of base and vortex body one, has relief opening near the vortex body center, and the position of this relief opening, size and curve correction have directly influenced the efficient and the reliability of scroll compressor.In the design of scroll compressor vent ports, traditional method is to adopt the fully engagement molded lines (PMP) of top through revising, this molded lines is actually the involute profile of top through revising, and normally adopt arc correction of symmetrical garden or symmetrical garden arc to add straight line correction, revised molded lines should satisfy single order continuously and be convenient to the numerical control machine tool programming.

But adopt PMP method designing and arranging gas opening, can make a pair of active chamber that forms between the dynamic and static scroll of scroll compressor in the process of compression working medium, and asynchronously be communicated with exhaust port, this will cause the compression of two active chambers and exhaust process incomplete same.Fig. 1 represents the situation that compression work chamber B elder generation and exhaust port are communicated with.

This is that the line of contact between the dynamic and static scroll constantly moves to the center, realizes the compression to gas owing to after dynamic and static scroll forms the swept volume of a pair of sealing, do rotation motion along with eccentric shaft drives moving scroll.The pressure of two active chambers is along with moving scroll angle of revolution θ changes, as shown in Figure 2, when the θ 1 of angle of revolution, the one compression work chamber B beginning is communicated with exhaust port, the pressurized gas than in low-pressure gas and the exhaust port exhaust cavity of living in the compression process mix, and Reed Valve is closed (otherwise will cause high vibration) simultaneously.Active chamber B pressure rises to P1 ' rapidly by P1.When angle of revolution θ arrived contact points, when promptly arriving drop out of gear angle θ *, dynamic and static scroll broke away from engagement, and active chamber A, B are communicated with exhaust port.Two chamber gases mix, and pressure is mixed to P3 by P2, P2 ' respectively, and when the θ d of angle of revolution, pressure rises to P4, and Reed Valve is opened, and exhaust process begins.Initial theory analysis shows (see figure 2).

Obviously, with traditional PMP method designing and arranging gas opening, to cause before dynamic and static scroll drop out of gear, the central task chamber at exhaust port place promptly communicates with the active chamber of still locating compression process, and earlier with symmetrical active chamber in one communicate, cause this cavity pressure obviously to rise, produce additional unbalanced force and vibration; And the scroll compressor of not establishing outlet valve power consumption and other future troubles that also will cause gas to flow backwards bringing.The efficient of therefore existing scroll compressor does not reach perfect condition yet, still remains further to be improved.

The purpose of this utility model is exactly in order to address the above problem, and provides a kind of scroll compressor that can further improve the scroll compressor working efficiency efficient fixed scroll.

Technical solution of the present utility model:

The efficient fixed scroll of a kind of scroll compressor, it includes base and vortex body thereof, it is characterized in that near the relief opening position the vortex body center is determined by the drop out of gear angle θ * of dynamic and static scroll, and θ * should satisfy following formula: $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&gamma;}={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}-\mathrm{arctg}\left(\frac{d_a}{a}\right)$

In the formula:

E---the vortex body involute is finally opened up the angle

γ---revise the angle of center of arc's line and X-axis

β---correction angle

d _a---revise the distance of the center of circle to the basic circle point of contact

A---fixed scroll involute Base radius.

The utility model vent ports only is communicated with the central task chamber in exhaust process all the time, and be not communicated with arbitrary compression work chamber of following one-period, air-breathing, the compression of two active chambers, exhaust process symmetry have avoided pressure sharply to rise and additional unbalanced force and vibration.The utility model exhaust port area should be big as far as possible, when having reduced exhaust resistance and loss, reduced not establish the power consumption that the scroll compressor of outlet valve expands and causes because of clearance volume mesohigh gas, the utility model can be applicable to also can be applied in the room air conditioner scroll compressor in the scroll compressor of car air conditioner.Vent ports design of the present utility model further improves the working efficiency of scroll compressor, and effect is very good.

The utility model is described in further detail below with reference to accompanying drawing.

Fig. 1 is the working state schematic representation of existing asymmetric compression of scroll compressor two active chambers and exhaust;

Fig. 2 is existing scroll compressor two active chambers pressure-angle relation schematic representation;

Fig. 3 is a structural representation of the present utility model;

The theoretical position schematic representation of exhaust port when Fig. 4 is the dynamic and static scroll drop out of gear of the utility model position;

Fig. 5 is the plan of the utility model vent ports;

Fig. 6 is the utility model symmetry circular arc corrected parameter schematic representation;

Fig. 7 is that the utility model symmetry circular arc adds straight line corrected parameter schematic representation.

As Fig. 3, the utility model includes base 1 and vortex body 2 thereof, and characteristics of the present utility model are that near relief opening 3 positions vortex body 2 centers are determined by the drop out of gear angle θ * of dynamic and static scroll, and θ * should satisfy following formula: $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&gamma;}={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}-\mathrm{arctg}\left(\frac{d_a}{a}\right)$

In the formula:

E---the vortex body involute is finally opened up the angle

γ---revise the angle of center of arc's line and X-axis

β---correction angle

d _a---revise the distance of the center of circle to the basic circle point of contact

A---fixed scroll involute Base radius.

Relief opening 3 positions are determined by the drop out of gear angle θ * of dynamic and static scroll, and θ * should further satisfy following formula: $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}+\mathrm{arctg}\left(\frac{d_a}{a}\right)+\arcsin \left[\frac{R_a+r_a}{2\sqrt{a^2+d_a^2}}\right]$

In the formula:

E---the vortex body involute is finally opened up the angle

β---correction angle

d _a---revise the distance of the center of circle to the basic circle point of contact

A---fixed scroll involute Base radius

R---revise circle radius

R---connect circle radius.

The utility model is determined the shape and the position of exhaust port 3 according to the geometrical property of PMP by the drop out of gear position of dynamic and static scroll.The theoretical position of exhaust port when being the dynamic and static scroll drop out of gear of the utility model position shown in Figure 4, Fig. 5 is the plan of vent ports, Fig. 6,7 has provided symmetrical circular arc corrected parameter schematic representation and symmetrical circular arc adds straight line corrected parameter schematic representation.For ease of analyzing definition drop out of gear angle θ *, promptly dynamic and static scroll drop out of gear top disengaging drop out of gear angle.θ=0, the then symmetrical circular arc correction drop out of gear angle of Fig. 5 when making the sealing of vortex body outermost

, Fig. 6 symmetry circular arc adds straight line correction drop out of gear angle $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}+\mathrm{arctg}\left(\frac{d_a}{a}\right)+\arcsin \left[\frac{R_a+r_a}{2\sqrt{a^2+d_a^2}}\right]$

Do not establishing (as n=12000r/min) under outlet valve and the high frequency, the angle when the exhaust angle begins to be communicated with exhaust with exhaust port for the compression work chamber.The geometric parameter of correction of molded lines top and exhaust port is depended at the exhaust angle.By the vent design of aforementioned principle,

Behind the installing outlet valve, the spring force of condensing pressure and outlet valve is also depended at the exhaust angle.A compression chamber begins to the whole cycle that exhaust finishes from air-breathing, and pressure one angle relation is as follows:

P(θ)＝P _s (0≤θ _d≤2π)

(0≤θ _d≤2π)

P(θ)＝P _d (θ _d＜θ≤θ*+2π)

To Reed Valve, can determine by following formula:

P(θ)＝KP _d ${\mathrm{\&theta;}}_d=v^{n-1}\left(\sqrt[n]{\frac{P_s}{{\mathrm{KP}}_d}{v}_s}\right)$

In the formula, k-factor depends on operating mode, is returned by laboratory data, can just decide K=1 in the design.

In the formula and figure in symbol definition:

A---fixed scroll involute Base radius

R---revises circle radius r and---connects circle radius α---involute initial angle t---vortex body wall thickness N---compression chamber logarithm _E---the vortex body involute is finally opened up angle β, and------corrected parameter γ---revises the angle ζ of center of arc's line and X-axis and---revises angle theta---crank pin corner P---pressure θ *---drop out of gear angle V---specific volume n---the polytropic exponent d that is connected straight line and X-axis correction angle ε _c, d _a---revise apart from subscript: c---symmetrical circular arc correction a---symmetrical circular arc add straight line correction s---air-breathing d---exhaust of the center of circle to the basic circle point of contact.

Claims (2)

1, the efficient fixed scroll of a kind of scroll compressor, it includes base and vortex body thereof, it is characterized in that near the relief opening position the vortex body center is determined by the drop out of gear angle θ * of dynamic and static scroll, and θ * should satisfy following formula: $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&gamma;}={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}-\mathrm{arctg}\left(\frac{d_a}{a}\right)$

In the formula:

E---the vortex body involute is finally opened up the angle

γ---revise the angle of center of arc's line and X-axis

β---correction angle

d _a---revise the distance of the center of circle to the basic circle point of contact

A---fixed scroll involute Base radius.

2, the efficient fixed scroll of scroll compressor according to claim 1, it is characterized in that described relief opening position determined by the drop out of gear angle θ * of dynamic and static scroll, and θ * should further satisfy following formula: $\mathrm{\&theta;}*={\mathrm{\&phi;}}_E-\frac{\mathrm{\&pi;}}{2}-\mathrm{\&beta;}+\mathrm{arctg}\left(\frac{d_a}{a}\right)+\arcsin \left[\frac{R_a+r_a}{2\sqrt{a^2+d_a^2}}\right]$

In the formula:

E---the vortex body involute is finally opened up the angle

β---correction angle

d _a---revise the distance of the center of circle to the basic circle point of contact

A---fixed scroll involute Base radius

R---revise circle radius

R---connect circle radius.

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