CN202117928U - Capacitance variable type rotary compressor - Google Patents

Abstract

Provided is a capacitance variable type rotary compressor. A motor and a compressing assembly are arranged in the shell, the compressing assembly comprises a cylinder with a piston, a main bearing and an auxiliary bearing are respectively arranged on two sides of the cylinder, a by-pass hole is arranged on the cylinder, the main bearing or the auxiliary bearing, one end of the by-pass hole is communicated with the inside of the cylinder, and the other end of the by-pass hole is communicated with an air absorbing channel. A by-pass valve for controlling the rotary compressor to switch between a low capacitance mode and a high capacitance mode is arranged between the by-pass hole and the air absorbing channel. An exhausting starting angle in the low capacitance mode is theta d, an exhausting finishing angle in the low capacitance mode is gamma, when the piston rotates to a random angle, the radial gap between the piston and the cylinder is sigma, and the radial gap sigma is set to be at a minimum value in a core adjusting angle beta. The capacitance variable type rotary compressor sets the by-pass hole and the by-pass valve and limits the core adjusting angle beta, thereby being capable of effectively controlling the radial gap in low capacitance mode, lowering radial leakage and improving volumetric efficiency of the compressor.

Description

Variable volume type rotary compressor

Technical field

The utility model relates to a kind of rotary compressor, particularly a kind of variable volume type rotary compressor.

Background technique

In recent years, through the rotating speed of converter technique change rotary compressor, the method for the displacement variation of realization rotary compressor is more and more universal.But the method has increased the quantity of electronic component, has increased cost of production.Though the research of twin-tub variable capacity rotation compressor is in the develop rapidly,, the twin-tub variable capacity rotation compressor is compared with the single cylinder rotary compressor, has the many and high shortcoming of fabricating cost of number of components and parts.And, because the twin-tub variable capacity rotation compressor has increased by a cover compression assembly, make frictional loss increase.To this situation, the research of two sliding vane type rotary compressors is advancing.

In rotary compressor, when piston forwards to when arbitrarily angled, the radial clearance between piston and the cylinder is δ, and it is minimum value at the β angle that radial clearance δ is set, and then the β angle is called and transfers the core angle.According to traditional accent core angle design; Can only guarantee the good operation when the ability pattern is worked, but the single cylinder variable volume type rotary compressor generally is in the capabilities mode of operation, exists radial clearance excessive so; Radial leakage increases, the problem that the volumetric efficiency of rotary compressor is low.

The model utility content

The purpose of the utility model aims to provide that a kind of simple and reasonable, flexible operation, fabricating cost are low, the radial leakage when reducing the capabilities pattern, with the variable volume type rotary compressor of the volumetric efficiency that improves compressor, to overcome deficiency of the prior art.

A kind of variable volume type rotary compressor by this purpose design is provided with motor and compression assembly in the housing, compression assembly comprises the cylinder that has piston; Main bearing and supplementary bearing are separately positioned on the both sides of cylinder, and its structure characteristic is that cylinder, main bearing or supplementary bearing are provided with by-pass hole, and an end of by-pass hole communicates with the inside of cylinder; The other end of by-pass hole communicates with air intake passage, is provided with between by-pass hole and the air intake passage to be used to control the bypass valve that rotary compressor switches between capabilities pattern and ability pattern, and the exhaust initial angle during the capabilities pattern is θ d; It is γ that exhaust during the capabilities pattern finishes the angle; Forward to when arbitrarily angled at piston, the radial clearance between piston and the cylinder is δ, and setting radial clearance δ is minimum value at the β angle; Then the β angle is called accent core angle, and β satisfies following relation:

$-\frac{\mathrm{\&pi;}}{18}<\mathrm{\&beta;}-\frac{3\mathrm{\&pi;}}{2}*\frac{\mathrm{\&gamma;}-\mathrm{\&theta;d}}{6\mathrm{\&gamma;}-7\mathrm{\&pi;}}-\mathrm{\&theta;d}<\frac{\text{\&pi;}}{18}.$

Said cylinder, main bearing or supplementary bearing are provided with bypass passageways, and an end of this bypass passageways is communicated with the other end of by-pass hole, and the other end of bypass passageways communicates with air intake passage.

Traditional accent core angle design all is to be directed against the ability pattern, and according to traditional accent core angle, the radial leakage during the capabilities pattern is relatively large, causes the volumetric efficiency of compressor to descend.And be that variable volume type rotary compressor generally is in the capabilities mode state in the utility model, in order to guarantee the compressor performance under the capabilities pattern, must corresponding adjustment transfer the core angle.The utility model is transferred core angle β through by-pass hole and bypass valve being set and limiting, and the radial clearance in the time of can controlling the work of capabilities pattern effectively reduces radial leakage, improves compressor volume efficient.

The utlity model has that simple and reasonable, flexible operation, fabricating cost are low, the radial leakage when reducing the capabilities pattern, with the characteristics of the volumetric efficiency that improves compressor.

Description of drawings

Fig. 1 is the utility model one embodiment's a broken section structural representation.

Fig. 2 is the structural representation of the utility model when the ability pattern.

Fig. 3 is the structural representation of the utility model when the capabilities pattern.

Fig. 4 is the accent core angle design schematic representation of the utility model when the capabilities pattern.

Among the figure: 10 is housing, and 11 is cylinder, and 12 is piston, and 13.1 is slide plate, and 13.3 is sliding blade spring; 13.4 be the exhaust otch, 14 is supplementary bearing, 15 is main bearing, and 16 is rotor, and 17 is stator; 18 is eccentric crankshaft, and 20 is air intake passage, and 21 are by-pass hole, and 22 is bypass valve, and 23 is bypass passageways.Exhaust initial angle when θ d is the capabilities pattern, the exhaust when γ is the capabilities pattern finishes the angle, and β is for transferring the core angle.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 1-Fig. 4, this variable volume type rotary compressor comprises variable volume type rotary compressor; Comprise the electric machine assembly and the compression assembly that are arranged in the housing 10; Electric machine assembly comprises stator 17 and rotor 16, and stator 17 is fixed on the inwall of housing 10, and rotor 16 is fixed on the eccentric crankshaft 18.Compression assembly comprises cylinder 11 and eccentric crankshaft 18, is used to support the main bearing 15 of eccentric crankshaft 18 and the both sides that supplementary bearing 14 is arranged on cylinder 11.Be provided with piston 12, slide plate 13.1, vane slot, sliding blade spring 13.3, exhaust otch 13.4 in the cylinder 11.

Cylinder 11, main bearing 15 or supplementary bearing 14 are provided with by-pass hole 21; One end of by-pass hole 21 communicates with the inside of cylinder 11; The other end of by-pass hole 21 communicates with air intake passage 20, is provided with between by-pass hole 21 and the air intake passage 20 to be used to control the bypass valve 22 that rotary compressor switches between capabilities pattern and ability pattern.

For the ease of making, can cylinder 11, main bearing 15 or supplementary bearing 14 be provided with bypass passageways 23, an end of this bypass passageways 23 is communicated with the other end of by-pass hole 21, and the other end of bypass passageways 23 communicates with air intake passage 20.

In the present embodiment, radially be respectively arranged with air intake passage 20, by-pass hole 21, bypass valve 22 and bypass passageways 23 along cylinder 11.Bypass passageways 23 is passed housing 10 and is connected to air intake passage 20.Open and close bypass passageways 23 through control bypass valve 22.When bypass valve 22 cut out, bypass passageways 23 was closed, and this moment, compressor was the working state of ability pattern.When bypass valve 22 is opened; Bypass passageways 23 is opened, and before piston turned over by-pass hole 21, the portion gas in the active chamber of cylinder 11 was through by-pass hole 21 and bypass passageways 23; Be back to air intake passage 20; Can reduce the effective pressurized gas scale of construction, reach the purpose that cuts down the consumption of energy, this moment, compressor was the working state of capabilities pattern.

In actual conditions, this variable volume type rotary compressor generally is in the working state of capabilities pattern, and in order to guarantee the compressor performance under the capabilities pattern, the core angle is transferred in corresponding adjustment.

As shown in Figure 2, represent the residing position of piston with the line of centers 001 of cylinder and piston.001 when overlapping with the center line OA of first vane slot, as corner starting point θ=0.Piston rotates by the illustrated direction of arrow, counterclockwise, turns over suction port, begins compression.

When the pressure in the cylinder compression chamber was enough to make outlet valve to be opened, compression finished, the beginning exhaust, this moment rotational angle theta=θ d, and θ d is called the exhaust initial angle.Under the state of exhaust valve opening, along with piston motion, the volume of cylinder compression chamber constantly dwindles, and pressurized gas is discharged from the exhaust otch.

When the cylinder compression chamber is communicated with through another cylinder compression chamber chamber that exhaust otch and its are in breathing process at the back; Pressurized gas in it are the expansion moment completion of a cylinder compression chamber backward; Exhaust finishes, this moment rotational angle theta=γ, and γ is called exhaust and finishes the angle.

Piston rotates by the illustrated direction of arrow, counterclockwise, rotates back into the center line OA of first vane slot again, is regarded as turning over a circle 2 π angles.

Fig. 4 is the accent core angle design schematic representation under the working state of capabilities pattern, and the exhaust initial angle of this pattern is θ d, and it is γ that exhaust finishes the angle, i.e. the rear edge angle γ of exhaust otch.When piston forwards to when arbitrarily angled, the radial clearance of setting between piston and the cylinder is δ, and setting radial clearance δ is minimum value at the β angle, and the β angle is for transferring the core angle, and β satisfies following relation:

$-\frac{\mathrm{\&pi;}}{18}<\mathrm{\&beta;}-\frac{3\mathrm{\&pi;}}{2}*\frac{\mathrm{\&gamma;}-\mathrm{\&theta;d}}{6\mathrm{\&gamma;}-7\mathrm{\&pi;}}-\mathrm{\&theta;d}<\frac{\text{\&pi;}}{18}.$

All above angles are benchmark with the center line of vane slot all, measure along the sense of rotation of eccentric crankshaft.After having adopted above-mentioned technological scheme, when variable volume type rotary compressor was worked in the capabilities pattern, radial leakage was reduced, and the volumetric efficiency of compressor improves.

Claims (2)

1. variable volume type rotary compressor, housing is provided with motor and compression assembly in (10), and compression assembly comprises the cylinder (11) that has piston (12); Main bearing (15) and supplementary bearing (14) are separately positioned on the both sides of cylinder (11); It is characterized in that cylinder (11), main bearing (15) or supplementary bearing (14) are provided with by-pass hole (21), an end of by-pass hole (21) communicates with the inside of cylinder (11), and the other end of by-pass hole (21) communicates with air intake passage (20); Be provided with between by-pass hole (21) and the air intake passage (20) and be used to control the bypass valve (22) that rotary compressor switches between capabilities pattern and ability pattern; Exhaust initial angle during the capabilities pattern is θ d, and it is γ that exhaust during the capabilities pattern finishes the angle, forwards to when arbitrarily angled at piston (12); Radial clearance between piston (12) and the cylinder (11) is δ; Setting radial clearance δ is minimum value at the β angle, and then the β angle is called accent core angle, and β satisfies following relation:

$-\frac{\mathrm{\&pi;}}{18}<\mathrm{\&beta;}-\frac{3\mathrm{\&pi;}}{2}*\frac{\mathrm{\&gamma;}-\mathrm{\&theta;d}}{6\mathrm{\&gamma;}-7\mathrm{\&pi;}}-\mathrm{\&theta;d}<\frac{\mathrm{\&pi;}}{18}.$

2. variable volume type rotary compressor according to claim 1; It is characterized in that said cylinder (11), main bearing (15) or supplementary bearing (14) are provided with bypass passageways (23); One end of this bypass passageways (23) is communicated with the other end of by-pass hole (21), and the other end of bypass passageways (23) communicates with air intake passage (20).

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