KR101407199B1 - Vane rotary compressor - Google Patents

Abstract

The present invention relates to a vane rotary compressor in which a fluid such as a refrigerant is compressed while a volume of a compression chamber is reduced while a rotor is rotating. According to a temporary example of the present invention, a plurality of unit vanes , And a corresponding step is formed on the inner circumferential surface of the cylinder to provide a vane rotary compressor in which compression strokes are made in different sections by the unit vanes.

Description

{VANE ROTARY COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane rotary compressor in which a fluid such as a refrigerant is compressed while a volume of a compression chamber is reduced during rotor rotation, and more particularly, to a vane rotary compressor having an effect of reducing consumption power and improving compressor efficiency.

The vane rotary compressor is used in an air conditioner or the like, compresses a fluid such as a refrigerant, and supplies it to the outside.

Fig. 1 is a sectional view schematically showing a conventional vane rotary compressor disclosed in Japanese Unexamined Patent Application Publication No. 2010-31759 (Document 1), and Fig. 2 is a sectional view taken along line A-A in Fig.

1, a conventional vane rotary compressor 10 has a housing H constituted by a rear housing 11 and a front housing 12 as an outer appearance. Inside the rear housing 11, Of the cylinder 13 is accommodated.

At this time, the inner peripheral surface of the cylinder 13 has an elliptical cross-sectional shape as shown in Fig.

A front cover 14 is coupled to the front of the cylinder 13 and a rear cover 15 is coupled to the rear of the cylinder 13. In the rear housing 15, A discharge space Da is formed between the inner circumferential surface of the rear housing 11 and the front cover 14 and the rear cover 15 facing each other.

A rotary shaft 17 is installed in the front cover 14 and the rear cover 15 to be rotatable through the cylinder 13 and a cylindrical rotor 18 is coupled to the rotary shaft 17, And rotates in the cylinder 13 together with the rotary shaft 17 during rotation.

2, a plurality of slots 18a are radially formed on the outer circumferential surface of the rotor 18, a vane 20 is slidably accommodated in each slot 18a, 18a are supplied with lubricating oil.

When the rotor 18 is rotated by the rotation of the rotary shaft 17, the tip of the vane 20 protrudes outward of the slot 18a and is brought into close contact with the inner peripheral surface of the cylinder 13, An inner circumferential surface of the cylinder 13 and a pair of vanes 20 adjacent to each other; an opposing face 14a of the front cover 14 opposed to the cylinder 13; A plurality of compartments 21 are formed.

Here, in the case of the vane rotary compressor, the stroke in which the volume of the compression chamber 21 is enlarged in accordance with the rotation direction of the rotor 18 is the suction stroke, and the stroke in which the volume of the compression chamber 21 is reduced is the compression stroke.

1, a suction port 24 is formed in an upper portion of the front housing 12, and a suction space Sa communicating with the suction port 24 is formed in the front housing 12 .

A suction port 14b communicating with the suction space Sa is formed in the front cover 14 and a suction passage 13b communicating with the suction port 14b is formed in the axial direction of the cylinder 13.

As shown in Fig. 2, discharge chambers 13d recessed inward are formed on both sides of the outer circumferential surface of the cylinder 13, and the pair of discharge chambers 13d are connected to the compression chambers 13a, (21) and forms a part of the discharge space (Da).

The rear housing 11 is formed with a high-pressure chamber 30 which is partitioned by the rear cover 15 and into which compressed refrigerant flows. That is, the inside of the rear housing 11 is partitioned into the discharge space Da and the high-pressure chamber 30 by the rear cover 15. At this time, a discharge port 15e communicating with the high-pressure chamber 30 is formed in any one of the pair of discharge chambers 13d.

Therefore, when the rotor 18 and the vane 20 are rotated during the rotation of the rotary shaft 17, the refrigerant is sucked into the respective compression chambers 21 from the suction space Sa through the suction port 14b and the suction passage 13b, The refrigerant compressed in accordance with the volume reduction of the compression chamber 21 is discharged to the discharge chamber 13d through the discharge hole 13a and flows into the high pressure chamber 30 through the discharge hole 15e, 31).

Reference numeral 40 denotes an oil separator for separating the lubricating oil from the compressed refrigerant introduced into the high-pressure chamber.

Here, the conventional vane rotary compressor needs to change the volume of the refrigerant drastically by shortening the compression stroke until compressing and discharging the refrigerant introduced into the compression chamber. Thus, the flow resistance of the refrigerant increases and the consumption power HP There is a problem that the efficiency of the compressor is deteriorated.

[Document 1] JP 2010-31759 A 2010.2.12

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and one embodiment of the present invention is to provide a vane structure in which a unit vane is disposed vertically adjacent to the unit vane so that the fluid is compressed by the lower vane, So that a high compression ratio can be obtained, and a vane rotary compressor capable of reducing the consumption power and improving the efficiency of the compressor can be achieved.

According to a preferred embodiment of the present invention, there is provided an air conditioner comprising: a hollow cylinder having a suction port on one side; a rotor installed in the hollow and rotated by receiving power from a driving source; Wherein the vane includes a plurality of unit vanes disposed vertically adjacent to each other in the slot so as to be relatively movable in the direction of the inner circumferential surface of the cylinder.

At this time, a step is formed on one side of the inner circumferential surface of the cylinder, and at least one of the unit vanes moves along the upper side of the step and the other moves along the side wall of the step when the rotor rotates.

At this time, the side wall of the step may be formed of a curved surface having a predetermined curvature, and may be formed of a plurality of continuous curved surfaces.

According to the vane rotary compressor of the embodiment of the present invention, a plurality of unit vanes which are vertically adjacent to each other in a vertical direction are provided in a slot formed on the outer circumferential surface of the rotor, and a step having curved side walls is formed on the inner peripheral surface of the cylinder By varying the compression stroke by each unit vane, a high compression ratio can be obtained, and the consumption power HP can be reduced and the efficiency of the compressor can be improved.

1 is a cross-sectional view schematically showing a conventional vane rotary compressor;
2 is a sectional view taken along the line AA in Fig.
3 is a schematic diagram illustrating operation of an upper vane and a lower vane in accordance with one embodiment of the present invention.
Fig. 4 is a sectional view of Fig. 3; Fig.
FIG. 5 is a schematic view of a cylinder formed on an inner circumferential surface of a continuous curved surface according to another embodiment of the present invention. FIG.
6 is a schematic diagram illustrating operation of an upper vane and a lower vane in accordance with another embodiment of the present invention;

Hereinafter, preferred embodiments of a vane rotary compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Example

FIG. 3 is a schematic view showing the operation of the upper vane and the lower vane according to one embodiment of the present invention, and FIG. 4 is a sectional view of FIG. 3.

3 and 4, a vane rotary compressor 100 according to an embodiment of the present invention includes a hollow cylinder 210 having a hollow (not shown) at one side thereof, A rotor 300 installed in the hollow of the rotor 200 and rotated by receiving the driving force of the driving source, a vane inserted into the slot 310 formed on the outer circumferential surface of the rotor 300 and slidable in the direction of the inner circumferential surface of the cylinder 200 400).

Here, the cylinder 200 has a hollow 210 having an elliptical cross-sectional shape, and a suction port communicating with the hollow 210 is formed at one side. The fluid such as a refrigerant to be compressed is introduced into the cylinder 200 through the suction port, As shown in FIG.

A rotor 300 having a circular cross section is rotatably installed in the hollow 210 of the cylinder 200. The rotor 300 is provided with a plurality of The hollow 210 of the cylinder 200 is partitioned into a plurality of spaces by the vane 400 and each space is divided into a plurality of spaces by the front cover 14 (see FIG. 1) and the rear cover 15 And the lower side is a sealed compression chamber.

Here, the rotor 300 is coupled to a shaft 17 (see FIG. 1) connected to a clutch (not shown) driven by a drive motor (not shown) or an engine belt (not shown) and rotates together with the shaft.

A plurality of slots 310 are formed in an outer circumferential surface of the rotor 300 so as to be spaced apart from each other by a predetermined distance and the vanes 400 are slidably inserted into the slots 310.

The vane 400 inserted in the slot 310 of the rotor 300 slides in the direction of the inner circumferential surface of the cylinder 200 due to the centrifugal force and the pressure of the compressed fluid when the rotor 300 rotates, And rotates together with the rotor 300.

The vane 400 rotates together with the rotor 300 while the tip of the hollow 200 is in an elliptical shape and the tip of the hollow 200 is supported by the inner circumferential surface of the cylinder 200, The distance between the outer circumferential surface of the cylinder 200 and the inner circumferential surface of the cylinder 200 varies.

The outer peripheral surface of the rotor 300 and the outer peripheral surface of the cylinder 200 from the point t ₀ where the outer peripheral surface of the rotor 300 and the inner peripheral surface of the cylinder 200 abut each other along the rotational direction ) the furthest point a gap between the inner peripheral surface of the (t ₂₎ by the vane (a suction region to be 400), the sliding movement, and this period is a fluid suction chamber compressed refrigerant, such as along the slot 310 in the inner peripheral surface direction of the cylinder 200, to be.

The outer circumferential surface of the rotor 300 and the inner circumferential surface of the cylinder 200 can be moved along the rotational direction of the rotor 300 from the point t _{2 that} is the farthest distance between the outer circumferential surface of the rotor 300 and the inner circumferential surface of the cylinder 200. the abutting point (t ₃₎ until the vane 400 is pushed enters into the slot (310), a compression zone in which a fluid such as a compressed refrigerant in the compression chamber with decreasing the volume of the compression chamber.

In other words, when the rotor 300 and the vane 400 rotate, the volume of the compression chamber is increased in the suction section, and the fluid such as refrigerant flows into the compression chamber through the suction port. In the compression section, And the compressed fluid is then supplied to the outside through the discharge port.

Here, as shown in FIG. 4, the vane rotary compressor 100 according to an embodiment of the present invention includes a plurality of unit vanes disposed vertically adjacent to each other in one slot 310. Hereinafter, The unit vane of the lower vane 410 will be referred to as an upper vane 410 and the lower unit vane will be referred to as a lower vane 420. [

3 and 4 illustrate an example in which two unit vanes are arranged vertically adjacent to each other. However, the present invention is not limited to this and the number of unit vanes can be appropriately selected according to need.

The upper vane 410 and the lower vane 420 according to the embodiment of the present invention have different compression strokes. More specifically, the point at which the compression stroke ends is the same, but the point at which the compression stroke starts is different.

A step 220 is formed on the inner circumferential surface of the cylinder 200. The step 220 is preferably formed on both sides of the inner circumferential surface of the cylinder 200 so that the step 220 faces the lower vane 400, respectively.

The number of the step 220 may be appropriately selected as necessary in the same manner as in the case of the unit vane described above. have.

The step 220 moves along the rotation direction of the rotor 300 from the point t ₀ at which the outer circumferential surface of the rotor 300 and the inner circumferential surface of the cylinder 200 abut against each other along with the outer circumferential surface of the rotor 300 and the inner circumferential surface of the cylinder 200 is the distance between the start at one point (t ₁₎ of the segment to the farthest point (t _2), and abuts the outer peripheral surface and inner peripheral surface of the cylinder 200 of the rotor 300 again ends at point (t _3), The side wall 221 of the step 220 forms a curved surface having a predetermined curvature.

At this time, the side wall 221 of the step 220 serves to guide the rotation direction of the lower vane 420. That is, the upper vane 410 and the lower vane 420 are separated from each other to be movable relative to each other. Thus, the movement path in which the tip of the upper vane 410 rotates and the movement of the tip of the lower vane 420 The path can be different.

4, the distal end of the lower vane 420 is rotated along the step 220 while being supported by the side wall 221 of the step 220. At this time, the upper vane 410 has a lower end of the distal end, And is rotatably moved along the inner circumferential surface of the cylinder 200 while being supported by the upper side 222 of the step 220 and the tip end being supported by the inner circumferential surface of the cylinder 200. [

As the lower vane 420 is rotated along the side wall 221 of the step 220, the compression by the lower vane 420 starts before the compression by the upper vane 410. [

That is, the compression by the lower vane 420 starts at the point t ₁ where the step 220 is formed along the rotation direction of the rotor 300, and the compression by the upper vane 410 is performed by the rotor the outer surface and the distance between the inner circumferential surface of the cylinder 200, 300) starts at the furthest point (t _2).

Accordingly, the compression stroke can be longer than that in the prior art, so that the consumption power can be reduced. The fluid such as the refrigerant compressed by the lower vane 420 is moved upward in the same compression chamber and compressed again by the upper vane 410 So that a fluid having a high compression ratio can be obtained.

Hereinafter, the operation of the upper vane and the lower vane will be described with reference to FIG.

Although not shown in the drawing, a suction port through which a fluid such as a refrigerant flows into the hollow 210 of the cylinder 200 is provided adjacent to a point t ₀ , and preferably, a side wall of the cylinder 200, And is disposed to communicate with the compression chamber on the lower side.

At this time, the suction stroke is performed by the lower vane 420 from the point t ₀ where the outer circumferential surface of the rotor 300 abuts against the inner circumferential surface of the cylinder 200 when the rotor 300 rotates to the point t ₁ where the step 220 starts .

Then, from t ₁ point is the form the concave gently curved surface as the side wall 221 of the stepped (220) projecting in the outer circumferential surface direction of the rotor (300), t ₃ point side wall 221 of the stepped (220), the rotor ( The lower vane 420 is pushed into the slot 310 from the point t ₁ and the compression stroke is performed by the lower vane 420. At this time, the fluid such as the refrigerant compressed by the lower vane 420 moves upward in the same compression chamber and is compressed again by the upper vane 410.

On the other hand, the upper vane 410 is a rotor 300, and the distal end portion during rotation is moved along the stepped 220, cylinder 200, the inner circumferential surface of the upper side, in the t ₀ point is the intake stroke performed by t ₂ point, t in the _second branch A compression stroke is made up to t ₃ point. At this time, a fluid such as a refrigerant compressed by the lower vane 420 is pushed upward and compressed again by the upper vane 410 as described above.

In addition, t ₃ in the point, and converges to the inner peripheral surface of the side wall 221. The cylinder 200 of the stepped 220, and the inner peripheral surface of the cylinder 200 there is abutted with the outer peripheral surface of the rotor 300, a discharge port is t ₃ point and And is preferably provided to communicate with the compression chamber on one side of the side wall of the cylinder 200 or on the upper side of the cylinder 200.

That is, the fluid such as the refrigerant that flows into the compression chamber through the inlet port is compressed by the lower vane 420 and the upper vane 410 when the rotor 300 rotates, and the compressed fluid is supplied to the outside through the discharge port.

FIG. 5 is a schematic view of a cylinder having a curved surface formed on its inner circumferential surface according to another embodiment of the present invention, and FIG. 6 is a schematic view showing the operation of the upper vane and the lower vane according to another embodiment of the present invention.

5 and 6, the vane rotary compressor 100 'according to another embodiment of the present invention includes the side wall 221 of the step 220 formed on the inner circumferential surface of the cylinder 200 in the above- The sidewall 221 'of the step 220' is composed of a plurality of continuous curved surfaces, unlike the curved surface having a predetermined curvature.

5 and 6 show the side wall 221 'of the step 220' formed of two consecutive curved surfaces 221a and 221b, the present invention is not limited to this, and the number of continuous curved surfaces And the curvature can be appropriately selected as needed.

The curved surface of the step 220 'formed first along the rotation direction of the rotor 300 is referred to as a first curved surface 221a and the curved surface of the step 220' formed on the side wall 221 ' And the curved surface will be referred to as a second curved surface 221b.

Here, the first curved surface 221a protrudes toward the outer circumferential surface of the rotor 300 along the rotation direction of the rotor 300, and the second curved surface 221b protrudes from the point where the first curved surface 221a ends (t ₂ ) to the inner circumferential surface of the cylinder 200 along the rotational direction of the rotor 300, and converges with a gentle concave surface.

At this time, according to another embodiment of the present invention, the step 220 'is located at a position (t ₁ ) which is the farthest distance between the outer peripheral surface of the rotor 300 and the inner peripheral surface of the cylinder 200 .

That is, according to another embodiment of the present invention, the compression stroke starts at the same point between the upper vane 410 and the lower vane 420. However, the points where the compression stroke of the upper vane 410 and the lower vane 420 are terminated are different from each other.

It is preferable that the curvature of the second curved surface 221b corresponds to the curvature of the outer circumferential surface of the rotor 300. This is because the lower vane 420 moving along the side wall 221 ' It is preferable that the second curved surface 221b and the outer circumferential surface of the rotor 300 are completely accommodated in the slot 310 and are in contact with each other.

That is, the compression stroke by the lower vane 420 ends at the point t ₂ at which the lower vane 420 meets the second curved surface 221b. On the other hand, the compression stroke of the top of the vane 410 is at the end point (t _3), the inner peripheral surface of the outer surface and the cylinder 200 of the rotor 300 to meet again.

According to another embodiment of the present invention, the compression stroke by the upper vane 410 and the lower vane 420 starts at the same point t ₁ , but when the first curved surface 221 a is concave in the direction of the outer peripheral surface of the rotor 300 The compression ratio of the lower vane 420 is higher than the compression ratio of the upper vane 410 so that the lower vane 420 is compressed by the lower vane 420 while passing through the first curved surface 221a The fluid, such as compressed refrigerant, is compressed by the upper vane 410 passing over the upper side 222 'of the step 220'.

As soon as the lower vane 420 completely passes the first curved surface 221a, the fluid such as refrigerant compressed by the lower vane 420 moves upward in the same compression chamber and the lower vane 420 moves The outer peripheral surface of the rotor 300 is abutted against the second curved surface 221b while the upper vane 410 is held in the inner peripheral surface of the cylinder 200 and the step 220 ' To compress the fluid, such as refrigerant.

According to another embodiment of the present invention, when the compressed fluid is supplied to the outside through the discharge port near the t ₃ point, a high compression ratio can be obtained in the compression stroke of the same period as the conventional case Since the compression progresses sequentially by the lower vane 420 and the upper vane 410, it is possible to obtain the effect of improving the compressor efficiency according to the reduction of the consumption power HP.

Hereinafter, the operation of the upper vane and the lower vane according to another embodiment of the present invention will be described with reference to FIG.

Although not shown in the drawing, a suction port through which a fluid such as a refrigerant flows into the hollow 210 of the cylinder 200 is provided adjacent to a point t ₀ , and preferably, a side wall of the cylinder 200, And is disposed to communicate with the compression chamber on the lower side.

The upper vane 410 and the lower vane 420 are rotated from the point t ₀ where the outer circumferential surface of the rotor 300 contacts the inner circumferential surface of the cylinder 200 to the point t ₁ where the step 220 ' The suction stroke is performed.

Then, from t ₁ point t by _two points a first curved surface (221a) This forms a concave curved surface gently while projecting in the outer circumferential surface direction of the rotor 300, at t _2, the point of the first curved surface (221a), the rotor 300 as the outer peripheral surface for engaging with the first vane surfaces 420, the lower moving along a (221a) is t after the _first point seobuteo slot (310) being held pressed in the compression stroke is made by the bottom of the vane 420. the At this time, the fluid such as the refrigerant compressed by the lower vane 420 moves upward in the same compression chamber and is compressed again by the upper vane 410.

t from the _second point t ₃ the outer peripheral surface of the rotor 300 until the point where the second surface (221b), and there is maintained an abutting state, t the refrigerant compressed by the vane 420 at the bottom ranging from t ₂ points ₁ points such as fluid The lower vane 420 is completely received into the slot 310 through the point t ₂ and the compression space by the lower vane 420 is eliminated, Respectively.

On the other hand, the upper vane 410 is a rotor 300 is moved along the distal end portion is stepped (220 '), the cylinder 200 of the upper inner circumferential surface during rotation, and the intake stroke until t ₁ point is made in the t ₀ point, t ₁ point in the compression stroke it is made from t ₃ points. At this time, a fluid such as a refrigerant compressed by the lower vane 420 is pushed upward and compressed again by the upper vane 410 as described above.

In addition, in the t ₃ points second surface (221b) is there is converged to the inner peripheral surface of the cylinder 200 and abuts the outer peripheral surface of the rotor 300, the inner peripheral surface of the cylinder 200, the discharge port is provided adjacent to and t ₃ points And is preferably provided to communicate with the compression chamber on one side of the side wall of the cylinder 200 or on the upper side of the cylinder 200.

That is, the fluid such as the refrigerant that flows into the compression chamber through the inlet port is compressed by the lower vane 420 and the upper vane 410 when the rotor 300 rotates, and the compressed fluid is supplied to the outside through the discharge port.

100, 100 ': Vane rotary compressor
200: Cylinder
210: hollow
220, 220 ': step
221, 221 ': side wall
221a: first curved surface
221b: second curved surface
222, 222 ': Upper side
300: Rotor
310: Slot
400: Vane
410: upper vane
420: lower vane

Claims (4)

A rotor 300 installed in the hollow 210 and adapted to rotate by receiving power from the driving source and a plurality of slots formed in the outer circumferential surface of the rotor 300, And a vane (400) slidably inserted into the cylinder (310) in the direction of the inner circumferential surface of the cylinder (200), the vane rotary compressor
The step 220 and 220 'are formed on one side of the inner circumferential surface of the cylinder 200,
The vane 400 includes a plurality of unit vanes 410 and 420 disposed vertically adjacent to each other in the slot 310 so as to be relatively movable in an inner peripheral surface direction of the cylinder 200,
At least one of the unit vanes 410 moves along the upper surfaces 222 and 222 'of the step 220 and 220' during rotation of the rotor 300 and the other 420 moves along the side walls of the step 220 and 220 ' 221 ' and 21 ').≪ / RTI >
delete The method according to claim 1,
Wherein the side walls (221, 221 ') of the step (220, 220') are formed as curved surfaces having a predetermined curvature.
The method of claim 3,
, And the sidewall (221 ') of the step (220') is formed of a plurality of continuous curved surfaces (221a, 221b).

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