KR20160039465A - Back pressure apparatus of scroll compressor - Google Patents

Abstract

A back pressure regulating device for a scroll compressor is disclosed. The back pressure regulating device of a scroll compressor according to an embodiment of the present invention includes a motor unit inserted into a rotating shaft of a scroll compressor and having permanent magnets having different polarities; And an orbiting scroll which is disposed on an upper portion of the center head positioned above the motor unit and in which a magnet unit having different polarities is inserted in a state of facing the permanent magnet.

Description

BACK BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back pressure regulator for a scroll compressor, and more particularly to a back pressure regulator for a scroll compressor.

Generally, a cooling device installed in a vehicle is composed of a compressor, a condenser, an expansion valve, and an evaporator. The compressor compresses the refrigerant gas discharged from the evaporator into a high temperature and high pressure state, which is easy to be liquefied, and transfers it to the condenser. In addition, the compressor performs a function of pumping and recirculating the refrigerant so that the cooling is continued.

The condenser is made by liquefying the refrigerant gas by heat exchange with the high-temperature and high-pressure refrigerant gas, and the expansion valve expands the liquid refrigerant adiabatically to lower the temperature and the pressure, thereby making it easy to evaporate in the evaporator.

The evaporator evaporates the liquid refrigerant by absorbing the heat by exchanging the liquid refrigerant with the outside air introduced into the room. The outside air is cooled by being deprived of heat by the refrigerant and blown into the interior of the car by the blower.

The compressor includes a reciprocating type in which a portion compressing a working fluid (refrigerant) performs compression while performing a reciprocating motion, and a rotary type in which compression is performed while rotating. In the reciprocating type, a driving force of a driving source is transmitted to a plurality of pistons And a wobble plate type that uses a swash plate type and a wobble plate to transmit the rotation mode to a swash plate type rotary shaft.

The scroll compressor mainly includes a driving unit, a control unit, and a compression unit. The compression unit compresses the refrigerant by rotating by the rotational driving force generated by the driving unit, and is connected to the rear end of the rotation axis of the driving unit.

The compressor includes an orbiting scroll rotatably mounted on an inner rear end of a housing of the driving unit, and a fixed scroll for compressing the refrigerant together with the orbiting scroll, wherein the orifice is introduced into the compression chamber formed by the relative rotation of the orbiting scroll and the fixed scroll Thereby compressing the refrigerant.

In the screw compressor operated in this way, a pressure corresponding to the pressure of the discharge refrigerant is applied to the orbiting scroll in accordance with the operation of the air conditioner. In this case, in order to maintain the back pressure toward the orbiting scroll, And then flows into the center head to maintain the back pressure in the orbiting scroll.

However, such a method has a problem that the back pressure generating path toward the orbiting scroll is very complicated after the discharged refrigerant flows into the center head, and when the pressure is applied to the orbiting scroll under different pressures, the back pressure can not be maintained in proportion thereto .

As a result, the air-conditioner installed in the vehicle does not secure the ultra-stable cooling performance, resulting in complaints of the passengers on the vehicle, and further problems caused by leakage of the refrigerant have been caused.

Korean Patent Publication No. 10-2013-0011658 (Jan. 30, 2013)

Embodiments of the present invention provide a backpressure regulating device that can easily regulate the back pressure applied to the orbiting scroll in the scroll compressor using magnetism in accordance with the rotation angle of the rotation axis.

According to an aspect of the present invention, there is provided a scroll compressor comprising: a motor unit inserted in a rotary shaft of a scroll compressor and having permanent magnets having different polarities; And an orbiting scroll which is disposed on an upper portion of the center head positioned above the motor unit and in which a magnet unit having different polarities is inserted in a state of facing the permanent magnet.

The permanent magnets are formed in a semicircular ring shape and are disposed facing each other on the rotating shaft.

And the magnet unit has a size corresponding to the permanent magnet.

And the center head is located within a radius of the magnet unit.

A back pressure regulating device for a scroll compressor according to another embodiment of the present invention includes: a motor unit inserted into a rotating shaft of a scroll compressor and having a plurality of permanent magnets having different polarities; And a orbiting scroll disposed on an upper portion of the center head positioned above the motor unit and including a plurality of magnet units having different polarities so as to face the permanent magnets.

The permanent magnet is characterized in that the rotating shaft is concentric and the N pole and the S pole are alternately arranged.

The magnet unit has a number corresponding to the permanent magnets, and N poles and S poles are alternately arranged.

And the magnet unit has a size corresponding to the permanent magnet.

The back pressure regulating device of a scroll compressor according to another embodiment of the present invention includes a motor unit inserted into a rotating shaft of a scroll compressor and having permanent magnets having different polarities; And an orbiting scroll having an electromagnet unit disposed in an upper portion of the center head positioned above the motor unit and having a magnetic force selectively changed by a current applied in a state facing the permanent magnet.

The back pressure regulating device includes a controller for controlling the amount of current applied to the electromagnet unit in proportion to the rotation angle of the rotation shaft.

The embodiments of the present invention can control the back pressure through the magnetic force between the permanent magnet provided in the motor unit and the magnet unit provided in the orbiting scroll, and the efficiency of the scroll compressor can be improved with a simple structure.

The embodiments of the present invention can improve the operating efficiency of the scroll compressor by adjusting the back pressure applied to the orbiting scroll according to the rotation angle of the shaft.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view schematically showing a back pressure regulating device of a scroll compressor according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scroll compressor, and more particularly, to a scroll compressor having a permanent magnet and a magnet unit.
3 is a perspective view schematically showing a permanent magnet and a magnet unit according to an embodiment of the present invention.
4 is a graph showing a back pressure state of the back pressure control device of the scroll compressor according to an embodiment of the present invention,
5 is a view schematically showing a back pressure regulating device of a scroll compressor according to another embodiment of the present invention.
6 is a perspective view schematically showing a permanent magnet and a magnet unit according to another embodiment of the present invention.
7 is a cross-sectional view schematically showing a back pressure regulating device of a scroll compressor according to another embodiment of the present invention.

A back pressure regulating device for a scroll compressor according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view briefly showing a back pressure regulating device of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a permanent magnet and a magnet unit of a back pressure regulating device of a scroll compressor according to an embodiment of the present invention. FIG. 3 is a perspective view schematically illustrating a permanent magnet and a magnet unit according to an embodiment of the present invention. Referring to FIG.

1 to 3, the scroll compressor 2 includes a motor unit 100 including a rotating shaft 10 positioned at an inner center of the compressor housing 3, And a revolving scroll 200 disposed at a position facing the center head 100. The revolving scroll 200 includes a center head 20,

A BLDC motor is used as the motor unit 100, and the BLDC (brushless DC) motor is configured to electronically rectify a DC motor without using a brush structure. That is, the position of the permanent magnet is detected by an electronic sensor such as a hall sensor, an electric angle is determined by the detected signal, and a current is supplied to the coil to generate torque.

The BLDC motor has no brushes, so it has less electrical and mechanical noise, is easy to speed up, has high reliability, can be downsized, and can be controlled by speed and speed change so that engine room or other installation object .

The permanent magnet 110 is inserted into the rotary shaft 10 in order to use the orbiting scroll 200 with different back pressure depending on the operating state of the scroll compressor. The permanent magnets 110 are formed in a semicircular ring shape and are arranged so as to face each other with the polarities of the N and S poles being on the basis of the rotation axis 10.

The orbiting scroll 200 includes a magnet unit 210 disposed at an upper portion of the center head 20 positioned on the upper side of the motor unit 100 and having different polarities in a state of facing the permanent magnet 110 do.

The orbiting scroll 200 is subjected to back pressure in the direction of the rotary shaft 10 in accordance with the pressure of the refrigerant when the scroll compressor 200 is rotated for compressing the refrigerant in the scroll compressor 2, To the orbiting scroll 200 at different pressures.

In particular, when the air conditioner is operated in a low load state in which the air conditioner mounted in the vehicle is initially operated and in a relatively high load state, different back pressure is applied to the orbiting scroll (200). The back pressure applied to the orbiting scroll (200) is controlled by the repulsive force and the attraction force generated between the permanent magnet (110) and the magnet unit (210) according to the rotation angle of the rotary shaft (10) It is possible to prevent the refrigerant from moving to the compressor 200 and the refrigerant from leaking, thereby stably operating the scroll compressor 2.

As the rotation angle of the rotary shaft 10 changes, the scroll compressor 2 repeatedly performs compression and discharge of the refrigerant, and will be described with reference to the drawings. For reference, the X axis represents the rotation angle of the rotary shaft 10, and the Y axis represents the back pressure applied to the orbiting scroll 200.

Referring to FIGS. 1 and 4, the rotary shaft 10 is rotated from 0 to 360 degrees. In this case, the back pressure applied to the orbiting scroll 200 is 0 The back pressure increases linearly up to a 180 degree angle, and back pressure decreases from 180 degrees to a 360 degree angle.

That is, the back pressure applied to the orbiting scroll 200 is periodically increased and decreased according to the rotation angle of the rotating shaft 10, so that the back pressure applied to the orbiting scroll 200 is controlled by the permanent magnets It is possible to control the back pressure of the scroll compressor by using the attraction force and the repulsive force generated between the magnet unit 210 inserted into the orbiting scroll 110 and the magnet unit 210 inserted into the orbiting scroll 200.

For this, the magnet unit 210 is formed in a ring shape of a semicircle like the above-described permanent magnet 110 and has a size corresponding to that of the permanent magnet 110, so that the N pole of the permanent magnet 110, When the S poles of the rotating shaft 210 are maintained to face each other, a state in which the orbiting scroll 200 is in close contact with the center head 20 is maintained.

This state is a state in which the back pressure applied to the orbiting scroll 200 when the rotary shaft 10 is rotated at a rotation angle of 0 to 90 degrees is the magnetic force acting between the permanent magnet 110 and the magnet unit 210 So that the operation efficiency of the scroll compressor 2 and the leakage of the unnecessary refrigerant can be minimized and stable operation can be achieved.

On the contrary, when the S pole of the permanent magnet 110 and the S pole of the magnet unit 210 are maintained to face each other, a repulsive force acts so that the orbiting scroll 200 is spaced toward the upper side of the center head 20 The back pressure of the scroll compressor 2 can be adjusted.

When the rotary shaft 10 is rotated at an angle of 90 degrees or more and 270 degrees or less, the back pressure applied to the orbiting scroll 200 acts between the permanent magnet 110 and the magnet unit 210 The operating efficiency of the scroll compressor 2 and the leakage of the unnecessary refrigerant can be minimized and stable operation can be achieved.

The magnet unit 210 is inserted into the lower surface of the orbiting scroll 200. The lower surface of the magnet unit 210 protrudes from the lower surface of the orbiting scroll 200 only by a certain distance or does not protrude from the lower surface of the orbiting scroll 200 . The reason why the magnet unit 210 is inserted as described above is to prevent the magnet unit 210 from being abraded or damaged due to friction with the center head 20 while the orbiting scroll 200 is rotating, In order to ensure stable operation of the apparatus.

The center head 20 is located within a radius of the magnet unit 210. The reason for this arrangement is to prevent malfunction or breakage and deformation due to direct interference with the magnet unit 210 while the orbiting scroll 200 is rotating So that the back pressure applied to the orbiting scroll 200 can be stably maintained in accordance with the operating state of the scroll compressor 2.

Therefore, even when the orbiting scroll 200 is operated at a high speed or is used for a long period of time, the magnet unit 210 is stably inserted without being worn or broken, so that the leakage of the refrigerant does not occur and the scroll compressor 2 fails The inoperative state due to the failure is not generated.

A back pressure regulating device for a scroll compressor according to another embodiment of the present invention will be described with reference to the drawings.

5 to 6, the scroll compressor 2 includes a motor portion 100a including a rotary shaft 10 positioned at an inner center of the compressor housing 3, And an orbiting scroll 200a disposed at a position facing the center head 20. The center head 20 is provided with a center head 20,

The motor unit 100a is provided with a plurality of permanent magnets 110a having different polarities and the orbiting scroll 200a is disposed on the upper portion of the center head 20 located on the upper side of the motor unit 100, And a plurality of magnet units 210a having different polarities in a state of facing the permanent magnets 110a.

The difference between the above-described embodiment and the present embodiment is that the above-described embodiment has a configuration in which the permanent magnet and the magnet unit are arranged in N poles and one S pole respectively, There is a difference between the pole and the S pole.

When the permanent magnet 110a is constituted by a plurality of unit permanent magnets and the magnet unit 210a is constituted by a plurality of unit magnet units, when the rotation axis 10 is rotated from 0 degrees to 90 degrees and 180 degrees The back pressure of the orbiting scroll 200a can be adjusted more precisely and the operating efficiency and the back pressure control efficiency of the scroll compressor 2 can be improved and stable operation can be achieved.

More specifically, the permanent magnet 110a is composed of a plurality of unit permanent magnets. The N pole and the S pole are arranged alternately concentrically with the rotary shaft 10, and the magnet unit 210a is made of a permanent N poles and S poles are arranged alternately in a state of facing each other with a corresponding number of the magnets 110a.

When the N pole of the permanent magnet 110a faces the S pole of the magnet unit 210a, a force is applied to each other to maintain the state that the orbiting scroll 200a is in close contact with the center head 20, When the N pole of the permanent magnet 110a and the N pole of the magnet unit 210a are opposed to each other, a repulsive force is applied to each other so that the orbiting scroll 200a is spaced apart from the center head 20.

Accordingly, the orbiting scroll 200a can be maintained in a state of being in close contact with the center head 20 in accordance with the rotation of the rotary shaft 10, and the separated state can be maintained, and the back pressure applied to the orbiting scroll 200a is also different So that stable operation of the scroll compressor 2 is achieved.

The magnet unit 210a has a size corresponding to that of the permanent magnet 110a. However, the attraction force or the repulsive force to the orbiting scroll 200a can be stably maintained only when the mutually facing state is maintained, so that the back pressure control can be performed .

A back pressure regulating device for a scroll compressor according to another embodiment of the present invention will be described with reference to the drawings.

7, the scroll compressor 2 includes a motor portion 100b including a rotating shaft 10 positioned at an inner center of the compressor housing 3, and a motor portion 100b disposed at an upper portion of the motor portion 100b. A center head 20 and an orbiting scroll 200b disposed at a position facing the center head 20. [

The motor unit 100b is inserted into the rotary shaft 10 of the scroll compressor 2 and is provided with permanent magnets having different polarities. The motor unit 100b includes N and S poles in the form of a semicircle about the rotary shaft 10.

The orbiting scroll 200b is disposed at an upper portion of the center head 20 located on the upper side of the motor unit 100b and is configured to selectively apply a magnetic force by a current applied in a state of facing the permanent magnet 110b And an electromagnet unit 210b which is changed.

The electromagnet unit 210b selectively controls the amount of current applied by the controller 300 that controls the amount of current applied in proportion to the pressure of the refrigerant discharged from the scroll compressor 2, 10 to control the back pressure applied to the orbiting scroll 200b by controlling the amount of current applied to the electromagnet unit 210b in proportion to the rotation angle of the orbiting scroll 200b.

For example, when the rotary shaft 10 is rotated from 0 degrees to 90 degrees, the control unit 300 can reduce the total amount of current applied to the electromagnet unit 210b to 180 degrees, which is relatively less than when the rotary shaft 10 is rotated So as to control the magnetic force generated in the electromagnet unit 201b.

In this case, the interval at which the orbiting scroll 200b is separated from the motor unit 100b is selectively changed, and the back pressure corresponding to the interval is controlled, so that the back pressure control of the scroll compressor 2 is stably performed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

2: Scroll compressor
3: compressor housing
20: center head
100, 100a, 100b:
110, 110a, 110b: permanent magnets
200, 200a, 200b: turning; scroll
210, 210a: magnet unit
210b: electromagnet unit
300:

Claims (10)

A motor unit 100 inserted into the rotary shaft 10 of the scroll compressor and having permanent magnets having different polarities; And
The orbiting scroll 200 is disposed at an upper portion of the center head 20 located above the motor unit 100 and has a magnet unit 210 having a polarity opposite to that of the permanent magnet 110, ) Of the scroll compressor. The method according to claim 1,
The permanent magnet (110)
Wherein the scroll compressor is formed in a ring shape of a semicircle and is disposed facing each rotation axis. The method according to claim 1,
The magnet unit (210)
Wherein the permanent magnet (110) has a size corresponding to that of the permanent magnet (110). The method according to claim 1,
The center head (20)
And is located within a radius of the magnet unit (210). A motor unit 100a inserted into the rotary shaft 10 of the scroll compressor and having a plurality of permanent magnets 110a having different polarities; And
A plurality of magnet units 210a disposed above the center head 20 positioned above the motor unit 100a and having a plurality of magnet units 210a having different polarities and facing the permanent magnets 110a, (200a). ≪ / RTI > 6. The method of claim 5,
The permanent magnet (110a)
And the N-pole and the S-pole are arranged alternately with the rotary shaft (10) concentric to each other. The method according to claim 5 or 6,
The magnet unit 210a includes:
And the N pole and the S pole are arranged alternately in the number corresponding to the permanent magnets (110a). 6. The method of claim 5,
The magnet unit 210a includes:
And a size corresponding to the permanent magnets (110a). A motor part (100b) inserted into the rotary shaft (10) of the scroll compressor and equipped with permanent magnets (110b) having different polarities; And
And an electromagnet unit (not shown) disposed above the center head 20 positioned above the motor unit 100b and having a magnetic force selectively changed by a current applied in a state of facing the permanent magnet 110b And the orbiting scroll (200b) into which the scroll compressor (210b) is inserted. 10. The method of claim 9,
The back pressure regulating device comprises:
And a controller (300) for controlling the amount of current applied to the electromagnet unit in proportion to the rotation angle of the rotation shaft.

Images