KR20160043407A

KR20160043407A - Back pressure control apparatus of compressor

Info

Publication number: KR20160043407A
Application number: KR1020140137752A
Authority: KR
Inventors: 박일영
Original assignee: 한온시스템 주식회사
Priority date: 2014-10-13
Filing date: 2014-10-13
Publication date: 2016-04-21
Also published as: KR102040967B1

Abstract

A back pressure control apparatus of a compressor is disclosed. The back pressure control apparatus of a compressor, according to an embodiment of the present invention, comprises: a center head which is arranged to face a turning scroll of a compressor and has a flow path part where a part of discharged refrigerants flows thereinto; and a thermal expansion part which is inserted into the flow path part and is thermally expanded to the turning scroll according to the temperature of the refrigerants.

Description

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 regulating a back pressure applied to an orbiting scroll of a compressor, and more particularly to a back pressure regulator for a 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 are intended to provide a backpressure regulating device for a compressor capable of actively responding to backpressure applied to orbiting scroll according to different temperatures of a refrigerant.

According to an aspect of the present invention, there is provided a compressor, comprising: a center head formed with a flow path portion in which a part of refrigerant discharged and disposed opposite to an orbiting scroll of a compressor flows; And a thermal expansion part inserted into the flow path part and thermally expanding toward the orbiting scroll according to the temperature of the refrigerant.

And the flow path is formed along the inner circumferential direction of the center head.

And the flow path portion is divided and arranged in the inner circumferential direction of the center head.

The center head includes a groove portion formed in the flow path portion for mounting the thermal expansion portion.

And the thermal expansion part is thermally expanded only in one direction.

The back pressure regulating device further includes a fixing groove formed on a bottom surface of the groove portion, and the thermally expanding portion further includes a protrusion inserted into the fixing groove.

The center head includes a supply passage formed for moving the high-pressure refrigerant to the passage portion, and the supply passage is formed with a relatively large diameter as compared with the passage portion.

And a plurality of supply flow paths are formed in the flow path portion.

The thermal expansion part is characterized by being formed in either a ring shape or a semicircular shape.

The thermal expansion part is characterized in that either NBR (Nitrile Butadiene rubber) or HNBR (Hydrogenated Nitrile) is selectively used.

In accordance with another aspect of the present invention, there is provided an apparatus for regulating the back pressure of a compressor, the apparatus comprising: a center head having a flow path disposed opposite the orbiting scroll of the compressor and through which a part of the discharged refrigerant flows; And a thermal expansion part inserted in the flow path part and having a refrigerant inflow groove through which the refrigerant passing through the flow path part flows, so that thermal expansion is performed toward the orbiting scroll according to the temperature of the refrigerant.

The refrigerant inlet groove has a first refrigerant inlet groove formed on a bottom surface of the thermal expansion unit; And a second refrigerant inflow groove communicating with the first refrigerant inflow groove and formed along the circumferential direction of the thermal expansion unit.

And a plurality of first refrigerant inflow grooves are formed toward the second refrigerant inflow grooves.

The embodiments of the present invention can adjust the back pressure of the orbiting scroll installed in the compressor differently according to the temperature of the refrigerant in a simple configuration, thereby improving the efficiency of the compressor and minimizing leakage of the refrigerant.

Embodiments of the present invention enable automatic control of the back pressure applied to the orbiting scroll in accordance with the back pressure that varies according to the operating state of the compressor, thereby minimizing the malfunction and error generation efficiency of the compressor at the beginning of operation of the air conditioner, can do.

1 is a cross-sectional view of a back pressure regulator of a compressor according to an embodiment of the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor,
3 is a cross-sectional view schematically illustrating a back pressure regulator of a compressor according to an embodiment of the present invention.
4 is a plan view showing a flow path of a back pressure regulator of a compressor according to an embodiment of the present invention.
FIG. 5 is a sectional view showing a seating state of a thermal expansion unit of a back pressure regulator of a compressor according to an embodiment of the present invention. FIG.
6 is a cross-sectional view illustrating a back pressure regulator of a compressor according to another embodiment of the present invention.
7 is a cross-sectional view illustrating a refrigerant inflow groove of a back pressure regulator of a compressor according to another embodiment of the present invention.
8 to 9 are operational states of a back pressure regulator of a compressor according to an embodiment of the present invention.

A back pressure regulator for a compressor according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a back pressure regulator of a compressor according to an embodiment of the present invention. FIG. 2 is a graph illustrating a relationship between a back pressure state acting on a back pressure regulator of a compressor, 3 is a cross-sectional view schematically showing a back pressure regulator of a compressor according to an embodiment of the present invention.

1 to 3, the back pressure regulating device 1 of the compressor includes a center head 100 disposed inside the compressor housing, an orbiting scroll (not shown) disposed at a position facing the center head 100, And a thermal expansion unit 200 inserted in the flow path portion 110 formed in the center head 100.

The center head 100 is provided with a flow path portion 110 in which a part of the discharged refrigerant is disposed to face the orbiting scroll 10 of the compressor and the thermal expansion portion 200 is inserted into the flow path portion 110 And the thermal expansion is made toward the orbiting scroll 10 according to the temperature of the refrigerant.

The center head 100 is formed along the inner circumferential direction of the flow path portion 110. The flow path portion 110 provides a space through which the high pressure refrigerant flows, Back pressure is formed in the scroll 10 to prevent unnecessary leakage of the refrigerant, thereby improving stable operation and efficiency of the compressor.

The thermal expansion unit 200 according to the present embodiment is thermally expanded toward the orbiting scroll 10 in accordance with the temperature of the refrigerant that changes according to the pressure of the refrigerant. More specifically, It is possible to automatically adjust the back pressure applied to the orbiting scroll 10 according to the cooling state because the thermal expansion is performed to different lengths depending on the temperature of the refrigerant.

Therefore, the back pressure adjustment to the orbiting scroll (10) can be carried out with a simple mechanism and the efficiency of the compressor can be improved.

4, the flow path portion 110 may be formed on the center head 100 in various forms. For example, as shown in FIG. 4A, the flow path portion 110 may be formed in the center circumferential direction As shown in FIG. In this case, the flow path portion 110 has a diameter corresponding to that of the orbiting scroll 10 and is formed on the center head 100.

For reference, the depth of the flow path portion 110 is not particularly limited, but may be relatively changed in consideration of the overall layout of the compressor.

4 (b), the flow path portion 110 is formed in a semicircular shape, and the flow path portion 110 is formed in a semicircular shape in the inner circumferential direction of the center head 100. In this case, Of the refrigerant flows.

When the flow path portion 110 is divided as described above, the refrigerant supplied to the thermal expansion portion 200 is supplied to each of the divided flow path portions and transfers high temperature thermal energy to the thermal expansion portion 200, Thereby enabling thermal expansion of the portion 200.

For example, when the orbiting scroll 10 has a relatively large diameter, the diameter of the center head 100 increases corresponding to the orbiting scroll 10. In this case, the refrigerant is supplied to the flow path portion 110 A time difference is generated depending on a position where the thermal expansion unit 200 is first contacted with the thermal expansion unit 200 and a position where the thermal expansion unit 200 is in contact with the thermal expansion unit 200. As a result, a state of thermal expansion toward the orbiting scroll 10 can be changed.

In the case of the present invention, even when the diameter of the orbiting scroll 10 is increased, the flow passage portion 110 is divided into at least two or more than N flow passage portions 110 for uniform thermal expansion of the thermal expansion portion 200, It is possible to uniformly supply the high-pressure refrigerant to the thermal expansion unit 200 and to form a back pressure for the orbiting scroll 10 by heat exchange with the thermal expansion unit 200, thereby stably operating the compressor.

5 to 6, the center head 100 includes a groove portion 102 formed in the flow path portion 110 for mounting the thermal expansion portion 200, and the groove portion 102 includes a thermal expansion portion 200, and the thermal expansion unit 200 can be stably installed in the groove portion 102. As shown in FIG.

The back pressure regulating device has a fixing groove 103 formed on the bottom surface of the groove portion 102 to maintain a more stable fixing state of the thermal expansion portion 200. The thermal expansion portion 200 is inserted into the fixing groove 103 The state of being fixed to each other is maintained by the protrusions 104 which are made of the same material.

The fixing groove 103 has a shape corresponding to the protrusion 104, and is not limited to the shape shown in the drawings, and can be variously changed.

Since the protrusion 104 is made of a material which is not thermally expanded, the thermal expansion unit 200 is maintained in a stable fixed state irrespective of the case where the thermal expansion unit 200 is thermally expanded toward the orbiting scroll 10.

Accordingly, even when the high-pressure refrigerant is forced to move the thermal expansion unit 200 to the outside of the groove 102, the fixed state can be stably maintained. Therefore, even when the refrigerant is used for a long time, .

The center head 100 includes a supply passage 300 formed to allow the high-pressure refrigerant to move to the passage portion 110. The supply passage 300 is connected to the high- And the supply passage 300 and the flow path portion 110 are in communication with each other.

The supply passage 300 is formed by a single supply passage when the passage portion 110 is formed in a single shape and divided into a number corresponding to the number of the passage portions when the passage portion is divided into two or more as described above Pressure refrigerant can be simultaneously supplied to the flow path of the thermal expansion unit 200 to achieve thermal expansion.

The supply passage 300 may be formed with a relatively large diameter as compared with the flow path portion. In this case, even when high-pressure refrigerant is supplied at regular intervals, the supply passage 300 stably supplies the refrigerant toward the flow path portion 110, Lt; / RTI >

A thermal expansion unit according to an embodiment of the present invention will be described.

The compressor compresses the refrigerant to a high pressure and supplies the compressed refrigerant to an evaporator (not shown) to enable cooling of a vehicle (not shown) equipped with the compressor. The high-pressure refrigerant compressed in the compressor is in a high- maintain.

For example, when the pressure of the discharge refrigerant discharged from the compressor is P 1, the temperature is maintained at a temperature of T 1 in proportion to the pressure of P 1, so that the back pressure applied to the orbiting scroll 10 also fluctuates.

For example, in a scroll compressor equipped with a scroll, a pressure is applied to the orbiting scroll (10) with a predetermined periodicity in a process of compressing the refrigerant to a high pressure.

In this case, the thermal expansion unit 200 is thermally expanded toward the orbiting scroll 10 according to the discharge pressures of the different refrigerants, so that the backpressure is maintained regardless of pressure fluctuations, thereby stably operating the scroll compressor. A nitrile rubber in which thermal expansion is performed in one direction in proportion to the temperature change of the refrigerant is used.

Here, the nitrile rubber may be any one selected from NBR (Nitrile Butadiene Rubber) and HNBR (Hydrogenated Nitrile), and may be changed to another configuration that thermally expands according to a temperature change. And the like.

For reference, NBR is a terpolymer of acrylonitrile and butadiene. The properties of the finished product are changed according to the content of acrylonitrile (18 ~ 50%). The higher the acrylonitrile content, the higher the resistance to oil and fuel I have.

NBR also has better mechanical properties and higher wear resistance than other elastomers.

The thermal expansion unit 200 is thermally expanded only toward the orbiting scroll 10 and is configured to correspond to the flow path unit 110. For example, the thermal expansion unit 200 may have either a ring shape or a semicircular shape, .

For example, when the pressure of the refrigerant discharged is relatively low, the temperature of the refrigerant delivered to the thermal expansion unit 200 is relatively low compared with the temperature of the refrigerant discharged at the relatively high pressure state, 200 are relatively reduced in the amount of deformation that causes thermal expansion toward the orbiting scroll (10).

When the air conditioner is operated in the ON state, the pressure applied to the orbiting scroll 10 is rapidly increased and the pressure of the discharged refrigerant also increases, and the temperature of the refrigerant also rises sharply.

The refrigerant thus raised is deformed into the maximum expandable state toward the orbiting scroll 10 by heat transfer with the thermal expansion unit 200, thereby maintaining the back pressure of the orbiting scroll 10, thereby stably operating the scroll compressor .

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

Referring to FIG. 7, the back pressure regulator 1a includes a center head 100 having a flow path portion 110 disposed opposite to the orbiting scroll 10 of the compressor and through which a part of the discharged refrigerant flows, A thermal expansion unit 200 having a refrigerant inflow groove 210 through which the refrigerant passed through the flow path portion 110 flows is formed so as to be thermally expanded toward the orbiting scroll 10 according to the temperature of the refrigerant, ).

The center head 100 is formed along the inner circumferential direction of the flow path portion 110. The flow path portion 110 provides a space through which the high-pressure refrigerant flows, Back pressure is formed in the scroll 10 to prevent unnecessary leakage of the refrigerant, thereby improving stable operation and efficiency of the compressor.

In this embodiment, a coolant inflow groove 210 is formed in a manner different from the above-described embodiment, and the coolant inflow groove 210 includes a first coolant inflow groove 212 and a second coolant inflow groove 214 .

The first refrigerant inlet groove 212 is formed on the bottom surface of the thermal expansion unit 200 to provide a passage through which high-pressure refrigerant flows. A plurality of the first refrigerant inlet grooves 212 may be formed toward the second refrigerant inlet grooves 214 for smooth thermal expansion of the thermal expansion unit 200 and the heat of the high- Energy can be delivered more quickly to form a back pressure in the orbiting scroll 10.

Accordingly, the responsiveness of the thermal expansion unit 200 can be improved and the back pressure can be controlled more precisely, thereby improving the operation efficiency of the scroll compressor through more active back pressure control for the scroll compressor, preventing leakage of the refrigerant, The loss can be minimized.

The second refrigerant inlet groove 214 communicates with the first refrigerant inlet groove 212 and is formed along the circumferential direction of the thermal expansion unit 200. Since the second refrigerant inlet groove 214 is formed inside the thermal expansion unit 200, The responsiveness of the thermal expansion unit 200 is improved, and the thermal expansion toward the orbiting scroll 10 is stably performed in accordance with the temperature change of the refrigerant.

The operating state of the back pressure regulator of the compressor according to one embodiment of the present invention will now be described with reference to the drawings. 8 is a cross-sectional view showing the operating state of the back pressure regulating device when the scroll compressor is operated under the low load condition, and Fig. 9 is a sectional view showing the state in which the back pressure regulating device is operated under the high load condition of the scroll compressor.

8, when the air conditioner mounted on the vehicle is operated in the on state, the scroll compressor compresses and circulates the refrigerant, and the pressure of the refrigerant is transmitted through the orbiting scroll 10. [ The thermal expansion unit 200 is thermally expanded according to the temperature change of the refrigerant transferred through the supply passage 300 and the flow path portion 110. Since the temperature of the refrigerant is relatively in the middle temperature state, The thermal expansion toward the orbiting scroll 10 is thermally expanded in the state shown in the drawing.

In this case, since the back pressure corresponding to the pressure applied to the orbiting scroll 10 is maintained, the back pressure according to the initial operation of the air conditioner is stably controlled.

Referring to FIG. 9, when the air conditioner is operated in a full load state after a lapse of a predetermined time, the pressure of the refrigerant applied to the orbiting scroll 10 is applied to the maximum pressure state. Further, the temperature of the refrigerant flowing into the flow path portion 110 is also supplied at a high temperature, and the thermal expansion portion 200 has a maximum value So that the orbiting scroll 10 is moved in the axial direction as shown in the figure to control the back pressure according to the operation state of the scroll compressor.

Therefore, it is possible to maintain a stable back pressure to prevent the leakage of refrigerant and to keep the cooling performance constant when the air conditioner is in the initial operation and full load state.

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.

10: Turning scroll
100: center head
102: Groove
103: Fixing groove
104: projection
110:
200: thermal expansion part
210: Refrigerant inflow groove
212: first refrigerant inlet groove
214: second refrigerant inlet groove
300: Supply flow

Claims

A center head (100) having a flow path portion (110) disposed opposite the orbiting scroll (10) of the compressor and through which a part of the discharged refrigerant flows; And
And a thermal expansion part (200) inserted in the flow path part (110) and thermally expanding toward the orbiting scroll (10) according to the temperature of the refrigerant.

The method according to claim 1,
The flow path portion 110 includes:
Wherein the center head (100) is formed along an inner circumferential direction of the center head (100).

The method according to claim 1,
The flow path portion 110 includes:
Wherein the center head (100) is divided and arranged in the inner circumferential direction of the center head (100).

The method according to claim 1,
In the center head 100,
And a groove portion (102) formed in the flow path portion (110) for mounting the thermal expansion portion (200).

The method according to claim 1,
The thermal expansion unit (200)
And the thermal expansion is performed only in one direction.

The method according to claim 1,
The back pressure regulating device comprises:
And a fixing groove (103) formed on a bottom surface of the groove portion (102)
The thermal expansion unit (200) further includes a projection (104) inserted into the fixing groove (103).

The method according to claim 1,
In the center head 100,
And a supply flow path () for moving a high-pressure refrigerant to the flow path portion (110)
The supply passage (300)
Wherein a diameter of the passage portion (110) is relatively larger than a diameter of the passage portion (110).

The method according to claim 1,
The supply passage (300)
Wherein a plurality of the flow paths (110) are formed in the passage portion (110).

The method according to claim 1,
The thermal expansion unit (200)
Wherein the compressor has a ring shape or a semicircular shape.

The method according to claim 1,
The thermal expansion unit (200)
Wherein one of NBR (Nitrile Butadiene Rubber) and HNBR (Hydrogenated Nitrile) is selectively used.

A center head (100) having a flow path portion (110) disposed opposite the orbiting scroll (10) of the compressor and through which a part of the discharged refrigerant flows; And
A thermal expansion unit (not shown) having a refrigerant inlet groove 210 through which the refrigerant passed through the flow path portion 110 flows is formed so as to be thermally expanded toward the orbiting scroll 10 according to the temperature of the refrigerant, 200). &Lt; / RTI >

12. The method of claim 11,
The refrigerant inflow groove 210 may be formed by,
A first refrigerant inflow groove 212 formed on a bottom surface of the thermal expansion unit 200;
And a second refrigerant inflow groove (214) communicating with the first refrigerant inflow groove (212) and formed along the circumferential direction of the thermal expansion unit (212).

13. The method of claim 12,
Wherein a plurality of the first refrigerant inlet grooves (212) are formed toward the second refrigerant inlet grooves (214).