KR102012372B1

KR102012372B1 - Oil separator for scroll compressor

Info

Publication number: KR102012372B1
Application number: KR1020140121186A
Authority: KR
Inventors: 김홍민; 문치명; 임권수; 정수철
Original assignee: 한온시스템 주식회사
Priority date: 2014-09-12
Filing date: 2014-09-12
Publication date: 2019-08-20
Also published as: KR20160031296A

Abstract

The V-shaped bent flow path for oil separation is provided in the housing forming the discharge chamber of the compressor, and the branching point of the bent flow path is directed toward the lower end of the compressor, so that the oil separation path of the refrigerant is restricted in a limited space. Disclosed is an oil separator of a scroll compressor that can be set longer and further improve oil separation performance of oil from discharged refrigerant.
The oil separator of the aforementioned scroll compressor includes a discharge chamber 70 receiving a compressed refrigerant from the compression chamber 60, and an oil separator 100 communicating with the discharge chamber 70, wherein the oil separator ( 100 is composed of a bent flow path 110 penetrating the rear casing 12 of the compressor in the thickness direction, the branching point of the bent flow path 110 is disposed in the vertical downward position of the rear casing 12 do.

Description

Oil separator for scroll compressor {Oil separator for scroll compressor}

The present invention relates to an oil separator of a scroll compressor, and more particularly, oil separation of oil from a refrigerant discharged by providing a bent flow path having a V-shape for oil separation in a housing forming a discharge chamber of the compressor. The present invention relates to an oil separator of a scroll compressor capable of improving performance.

In general, compressors that serve to compress refrigerant in a vehicle cooling system have been developed in various forms. Such a compressor may be classified into a reciprocating type that performs compression while reciprocating and a rotary type that performs compression while rotating according to a configuration of compressing a refrigerant.

Here, the reciprocating compressor uses a crank type for transmitting the driving force of a driving source to a plurality of pistons using a crank, a swash plate type for transmitting a rotating shaft provided with a swash plate, and a wobble plate using a wobble plate. There is a Wobble Plate Type, and there is a Vane Rotary Type using vanes, and a Scroll Type using rotating scrolls and fixed scrolls.

1 shows a configuration of a scroll compressor according to the prior art. Referring to FIG. 1, a scroll compressor has a housing 10 that forms an appearance. The housing 10 has a drive unit 20, a compression unit 30, and a control unit 40 installed therein, and the interior space of the housing 10 is a suction chamber 50 and a compression chamber 60. And the discharge chamber 70 and the back pressure chamber 80, respectively.

The drive unit 20 includes a stator 21 and a rotor 22 mounted coaxially inside the housing 10, and a rotation shaft 23 installed therethrough, and the compression unit ( 30 is a rotating scroll fixed to the inner side of the housing 10, and the rotating scroll to form a compression chamber 60 in engagement with the fixed scroll 31 while being eccentrically rotated by the drive unit 20 ( 32), the pivoting scroll 32 is eccentrically coupled to the rotary shaft 23 by the eccentric bush (24).

The controller 40 is configured to include various driving circuits and devices, such as a PCB mounted inside the housing 10.

The suction chamber 50 is a space for storing the refrigerant sucked from the outside of the housing 10, the compression chamber 60 is a space for compressing the refrigerant sucked into the suction chamber 50, the discharge chamber 70 is a space for discharging the compressed refrigerant in the compression chamber 60, the back pressure chamber 80 is a predetermined pressure is formed so that the swing scroll 32 is in close contact with the fixed scroll 31 direction. It is a space.

Looking at the process of compressing the refrigerant by the scroll compressor configured as described above, first when the external power is applied to the control unit 40 through the connection end, the control unit 40 to the drive unit 20 through the drive circuit or the like operation signal Send it.

When the operation signal is transmitted to the drive unit 20, the electromagnet-shaped stator 21 pressed into the inner circumferential surface of the housing 10 is excited to become magnetic, and thus, between the rotor 22 and the stator 21. Electromagnetic interaction is made so that the rotor 22 rotates at high speed.

At this time, when the rotating shaft 23 of the drive unit 20 rotates at high speed with the rotor 22, the turning scroll 32 of the compression unit 30 eccentrically coupled to the rear end of the rotating shaft is synchronously rotated at high speed. As the revolving scroll 32 revolves with respect to the fixed scroll 31 matched with each other, the refrigerant flowing from the suction chamber 50 to the compression chamber 60 is moved from the outer circumference of the scroll to the center of the scroll. After being compressed to a high pressure, the discharge chamber 70 is discharged to complete a series of refrigerant compression operations.

Meanwhile, the refrigerant discharged into the discharge chamber 70 is transferred to the outside of the housing 10 to be provided to an evaporator (not shown), and some of the refrigerant is decompressed through the orifice and then transferred to the back pressure chamber 80. The pressure is generated in the back pressure chamber 80 by the refrigerant transferred to the back pressure chamber 80, and the turning scroll 32 is in close contact with the fixed scroll 31 by the pressure, and thus the turning scroll 32. ) And the fixed scroll (31) is able to close the compression chamber 60 while being in close contact with no gap.

Here, the pressure of the back pressure chamber 80 is adjusted in conjunction with the pressure of the suction chamber 50 through the check valve 90 installed in the back pressure chamber (80). That is, when the pressure in the back pressure chamber 80 is higher than the pressure in the suction chamber 50 by a predetermined size or more, the check valve 90 is opened and the refrigerant in the back pressure chamber 80 is transferred to the suction chamber 50, thereby back pressure. The pressure of the chamber 80 is maintained to be only as high as a predetermined size relative to the pressure of the suction chamber 50.

The scroll compressor having the above configuration corresponds to an oil separator-free structure in which oil contained in the refrigerant discharged from the discharge chamber 70 cannot be separated separately. As shown in FIG. 2, such an oil separator-free scroll compressor is finally discharged through a discharge passage formed along the front circumference of the rear casing 12 after the refrigerant compressed to high temperature and high pressure is discharged to the discharge chamber 70. It is supplied to the evaporator (not shown) through the discharge port 12a. Arrows shown in FIG. 2 indicate discharge paths of the compressed refrigerant.

However, in the conventional scroll compressor, since the oil for lubrication is mixed with the high temperature and high pressure refrigerant provided to the evaporator, when the compressed refrigerant circulates in the cooling system as it is, the evaporator performance of the refrigerant decreases in the evaporator. It causes a problem of lowering the efficiency.

In order to solve this problem, various techniques have been developed in which oil separation is applied to a scroll compressor. For example, the scroll compressor disclosed in Korean Patent Laid-Open Publication No. 10-2011-0138991 is an example. That is, the conventional scroll compressor forms an oil separation chamber 52 for receiving refrigerant discharged from the discharge chamber 51 in the rear housing 50, and an oil separator for separating oil from the refrigerant compressed in the oil separation chamber 52. It consists of the structure which installs 60.

Accordingly, the refrigerant introduced into the oil separation chamber 52 causes swirl flow through contact with the oil separator 60, as shown in FIG. 2 of the prior art document, and the oil mixed in the refrigerant by the centrifugal force generated at this time. This can be separated.

However, since the oil separator 60 applied to the conventional scroll compressor is a cylindrical shape, the upper and lower portions of the oil separator 60 are opened in the longitudinal direction, so that some of the oil stored in the lower portion of the oil separation chamber 52 is upper. It is mixed with the flow of the refrigerant discharged to the discharge through the discharge port 55 with the refrigerant to reduce the durability of the compressor.

In addition, the scroll compressor of the prior art document should separately form the oil separation chamber 52 for receiving the refrigerant discharged from the discharge chamber 51 in the rear housing 50 to build the oil separator, and above all Since the oil separator 60 for separating oil from the compressed refrigerant in the silicide 52 must be additionally installed, not only the assembly of the compressor is easy but also an additional cost is required for the construction of the oil separator. .

In addition, the scroll compressor disclosed in U.S. Patent Publication No. 2005-0271534A1 has a technical disclosure that the oil separator 80 is provided on the discharge side of the refrigerant at the rear end of the housing. In order to provide a small scroll compressor, since it is necessary to increase the volume of the whole compressor, especially the axial length, to secure the proper space occupied, it is inevitable to add a considerable space burden, and new alternative steel balls are urgently required. It is true.

Republic of Korea Patent Publication No. 10-2011-0138991 Scroll Compressor US Patent Publication No. 2005-0271534A1 Scroll Compressor

Accordingly, the present invention has been made in view of the above-mentioned matters, and provides a V-shaped bent flow path for oil separation in the housing forming the discharge chamber of the compressor, and the branching point of the bent flow path is By disposing to the lower portion, the oil separation path of the oil-mixed refrigerant can be set longer in a limited space and the oil separation performance of the oil discharged from the discharged refrigerant can be further improved, and the scroll can have a more compact structure. The object is to provide an oil separator of a compressor.

In addition, the present invention in the composition of the bent flow path is formed by extending the installation portion of the existing relief valve and forming the other flow path toward the final discharge port by the cost required for the production of the oil separation path An object of the present invention is to provide an oil separator of a scroll compressor that can reduce the cost.

The present invention for achieving the above object comprises a discharge chamber for receiving the compressed refrigerant from the compression chamber, and an oil separator for communicating through the discharge chamber and the refrigerant discharge passage, the oil separator comprises a rear casing of the compressor It is composed of a bent flow path penetrating in the thickness direction, the branching point of the bent flow path is characterized in that it is disposed in the vertical downward position of the rear casing.

In the present invention, the bent flow passage is the primary oil separation chamber penetrating the rear casing in the vertical direction, the secondary oil separation chamber penetrating inclined upwardly from the bottom of the primary oil separation chamber, and the primary oil separation chamber Characterized in that the confluence consisting of a confluence space between the lower end and the lower end of the secondary oil separation chamber.

In the present invention, the primary oil separation chamber is characterized in that for forming the refrigerant discharge passage for communication with the discharge chamber.

In the present invention, the primary oil separation chamber is formed by closing the remaining space except the traffic portion with the secondary oil separation chamber in a state passing through the rear casing from the installation portion of the relief valve.

In the present invention, the secondary oil separation chamber is characterized in that it is bent at an acute angle with respect to the primary oil separation chamber.

In the present invention, at least one of the primary oil separation chamber and the secondary oil separation chamber is characterized in that it is arranged to pass through the center of the rear casing.

In the present invention, the confluence space is located at the lower end of the compressor based on the direction of gravity action.

In the present invention, the bent flow path is characterized in that to form a helical groove in the entire inner circumferential surface or some necessary section.

The oil separator of the scroll compressor according to the present invention provides a bent flow path for oil separation in the housing forming the discharge chamber of the compressor, and the direction of action of gravity to help the oil drop the branch point of the bent flow path. Since the path for the oil separation of the refrigerant can be set longer in a limited space by arranging it toward the lower end of the in-compressor, the compressor having a more compact structure as well as further improving oil separation performance capable of separating only oil from the discharged refrigerant It will provide an effect that can be configured.

In particular, in the composition of the bent flow path for oil separation, the cross-sectional area can be set to a circular shape to impart vortex-type rotational characteristics to the flow of the refrigerant, so that only the oil is separated from the mixed refrigerant more efficiently, thereby providing an evaporator. This prevents the deterioration of the evaporation performance of the refrigerant and provides an effect of improving the efficiency of the entire cooling system.

In addition, the present invention in the composition of the bent flow path for oil separation by setting the overall appearance to a variety of shapes, including V-shape and at least one of the plurality of flow paths to pass through the center of the housing of the flow path By maximizing the overall length will provide an effect that can actively contribute to the improvement of oil separation performance.

In addition, the present invention in the composition of the bent flow path is formed by extending the installation portion of the existing relief valve and forming the other flow path toward the final discharge port by the cost required for the production of the oil separation path It will provide the effect of reducing the cost.

1 is a cross-sectional view showing the main components of a conventional scroll compressor.
Figure 2 is a view showing the inside of the rear casing to explain the discharge path of the refrigerant in the conventional scroll compressor.
Figure 3 is a front view showing a rear casing integrally with an oil separator in the oil separator of the scroll compressor according to an embodiment of the present invention.
Figure 4 is a longitudinal sectional view showing the internal flow path structure of the rear casing in order to explain in detail the bent flow path constituting the oil separator shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a front view showing a rear casing having an oil separator integrally in the oil separator of the scroll compressor according to an embodiment of the present invention, Figure 4 is a more detailed view of the bent flow path constituting the oil separator shown in FIG. For the sake of simplicity, it is a longitudinal sectional view showing the internal flow path structure of the rear casing. In order to help the understanding of the configuration of the present invention, the general configuration of the scroll compressor will be described with reference to Figs. 1 and 2, and the same reference numerals will be given together at the same sites as the respective reference sites.

1 and 2, the scroll compressor according to the present invention includes a drive unit 20 for driving the compressor in the housing 10 to form an appearance, a compression unit 30 for compressing the refrigerant at high temperature and high pressure, And a controller 40 for controlling the operation of the driving unit 20.

The housing 10 divides the internal space into a suction chamber 50, a compression chamber 60, a discharge chamber 70, and a back pressure chamber 80, respectively, and a rear casing for installing the oil separator 100 at the rear. Assemble (12) separately.

The drive unit 20 includes a stator 21 and a rotor 22 mounted coaxially inside the housing 10, and a rotation shaft 23 installed therethrough.

The compression unit 30 is engaged with the fixed scroll 31 while being eccentrically rotated by a fixed scroll 31 fixed to one side of the housing 10 and the drive unit 20 to form a compression chamber 60. It is configured to include a turning scroll 32, wherein the turning scroll 32 is eccentrically coupled to the rotary shaft 23 by the eccentric bush 24.

The back pressure chamber 80 is adjusted in conjunction with the pressure of the suction chamber 50 through the check valve 90. That is, when the pressure of the back pressure chamber 80 is higher than the pressure of the suction chamber 50 by a predetermined size or more, the check valve 90 is opened and the refrigerant in the back pressure chamber 80 is transferred to the suction chamber 50. The pressure of the back pressure chamber 80 is maintained at a constant level only with respect to the pressure of the suction chamber 50.

Referring to FIGS. 3 and 4, the oil separator 100 provides a V-shaped bent flow path 110 inside the thickness portion of the member forming the rear casing 12 and the discharge chamber 70. ) Is configured to enable transportation. In this case, the bent flow path 110 is not limited to the external V-shape, it may be implemented in a structure of various shapes that can secure the oil separation path of the refrigerant to the maximum.

The bent flow path 110 is a predetermined angle from the bottom of the primary oil separation chamber 120, the primary oil separation chamber 120 to penetrate the member in a generally vertical downward direction inside the thickness portion of the rear casing 12 The secondary oil separation chamber 130 penetrates the member to be inclined upwardly toward the upper portion of the rear casing 12, and the lower end portion of the primary oil separation chamber 120 and the secondary oil separation chamber 130. At the branching point between the lower end of the flow path between them to enable mutual flow of the refrigerant and at the same time comprises a confluence space 140 for the installation of a relief valve (not shown).

Here, the primary oil separation chamber 120 forms a refrigerant discharge passage 122 to receive the compressed refrigerant from the discharge chamber 70, and the refrigerant discharge passage 122 is the primary oil separation chamber ( At the upper position of 120, the rear casing 12 is axially penetrated.

In this case, the primary oil separation chamber 120 may be formed through a process of further extending the through hole radially across the rear casing 12 from the site for installing the relief valve, and other paths. After further processing the through-hole along the remaining space except the traffic portion with the secondary oil separation chamber 130 may be configured by closing a separate sealing member (not shown) such as a plug.

Accordingly, the mixed refrigerant flowing into the primary oil separation chamber 120 from the discharge chamber 70 through the refrigerant discharge passage 122 naturally descends toward the bottom of the primary oil separation chamber 120 by its own weight. Since it can flow, it finally reaches the confluence space 140 corresponding to the lowest point of the branch point.

In addition, the secondary oil separation chamber 130 is bent at an acute angle in the confluence space 140 corresponding to the branch point with the primary oil separation chamber 120 is extended long toward the upper portion of the rear casing (12). Thus, the discharge port 132 corresponding to the final discharge point of the refrigerant is formed in the upper end portion.

Accordingly, the refrigerant lowered to reach the confluence space 140 through the primary oil separation chamber 120 is primary oil-separated due to a difference in specific weight and viscosity with oil, and then the oil-separated refrigerant is again Finally, the second oil separation chamber 130 is discharged to the outside through the discharge port 132.

In this process, the refrigerant that flows up to the discharge port 132 along the inside of the secondary oil separation chamber 130 is secondary oil-separated due to the difference in specific weight and viscosity, and then only the oil-separated refrigerant is further separated. This can be supplied to the evaporator through the discharge port 132. The secondary oil separation chamber 130 is provided from the discharge chamber 70 to the primary oil separation chamber 120 of the oil separator 100 through such a series of processes, and then again via the confluence space 140. In order to improve the oil separation performance for the refrigerant flowing along, the bent flow path 110 is set to a circular cross-section. Accordingly, the flow of the refrigerant descending and rising along the bent flow path 110 may be given a vortex type rotational characteristic, through which the oil separation performance for the mixed refrigerant containing oil may be further improved. .

This effect may be further increased when the spiral groove portion (not shown) is formed over the entire inner circumferential surface of the bent flow path 110 or a portion of the required portion. That is, the refrigerant discharged from the discharge chamber 70 toward the bent flow path 110 is guided to flow along the spiral groove formed on the inner circumferential surface of the flow path to the confluence space 140 located at the bottom of the oil separation chamber. Not only can be smoothly moved up to the end, it can also be smoothly moved over the path from the confluence space 140 to the discharge port 132 finally.

In this process, the refrigerant is able to continuously contact the inner circumferential surface of the bent flow path 110 while turning along the helical recess, whereby the oil contained in the refrigerant is centrifugal force resulting from the generation of the spiral turning flow, and the refrigerant. Due to the difference in specific weight and viscosity, oil can be separated more effectively.

In particular, at least one of the primary oil separation chamber 120 and the secondary oil separation chamber 130 may be set to pass through the center of the rear casing 12 to secure the oil separation path of the refrigerant within a limited space. It can be, through this can maximize the oil separation performance of the refrigerant.

On the other hand, the confluence space 140 is configured to be located at the lower end of the compressor in the position of the action of gravity while enabling the primary oil separation chamber 120 and the secondary oil separation chamber 130 to communicate with each other. Accordingly, the discharged coolant may smoothly flow down from the primary oil separation chamber 120 toward the confluence space 140 by its own weight, and then the refrigerant may flow in the secondary oil separation chamber from the confluence space 140. By flowing toward the discharge port 132 of 130, the remaining oil which could not be separated can be provided to the evaporator in the state of further oil separation.

In addition, when the confluence space 140 is configured to be able to communicate with the internal space of the compressor including the back pressure chamber 80 through a separate flow path (not shown), the drive unit inside the compressor to store the oil stored after oil separation. 20 and each of the friction parts located in the back pressure chamber 80 can be provided to implement a smooth lubrication and cooling action.

Therefore, in the oil separator of the scroll compressor according to the present invention having the above configuration, the refrigerant compressed to high temperature and high pressure according to the operation of the compression unit 30 is supplied from the compression chamber 60 to the discharge chamber 70, The compressed refrigerant provided in the discharge chamber 70 is supplied into the bent flow path 110 corresponding to the oil separation space through the refrigerant discharge passage 122.

At this time, the branching point of the bent flow path 110 is disposed toward the lower end of the compressor that can help the oil drop, so that the path for oil separation of the refrigerant can be set longer in a limited space, thereby being discharged The oil separation performance capable of separating only oil from the refrigerant can be further improved, and a compact compressor can be constructed.

In addition, in the composition of the bent flow path 110 for oil separation, the cross-section is set to a circular shape, and a spiral groove is formed in the entire inner circumferential surface of the flow path or in some necessary sections to provide a vortex type rotational characteristic to the flow of the refrigerant. Since it can be provided, the oil is separated from the mixed refrigerant more efficiently and provided to the evaporator, thereby preventing deterioration of the evaporation performance of the refrigerant and greatly improving the efficiency of the entire cooling system.

In particular, in the present invention, in the composition of the bent flow path 110 for oil separation, the overall appearance is set to various shapes including a V-shape and at least one flow path among the plurality of flow paths is the center of the rear casing 12. By setting it through the site, it is possible to maximize the overall length of the flow path and actively contribute to the improvement of oil separation performance.

In addition, in the composition of the bent flow path 110, one flow path is formed by extending the installation portion of the existing relief valve and the other flow path is formed to face the final discharge port 132 by forming a path for oil separation. It will be possible to reduce the cost of manufacturing.

As described above with reference to the accompanying drawings for the preferred embodiment of the present invention, the present invention is not limited by the above-described specific embodiments, those of ordinary skill in the art to which the present invention belongs Various modifications and variations are possible within the scope of the spirit and scope of the present invention as set forth below.

10-housing 12-rear casing
20-drive 30-compression
40-control unit 50-suction chamber
60-compression chamber 70-discharge chamber
80-back pressure chamber 90-check valve
100-Oil Separator 110-Bent Flow Path
120-1 Oil separation chamber 122-Refrigerant discharge passage
130-2 oil separation chamber 132-discharge port
140-Confluence

Claims

A discharge chamber 70 receiving a compressed refrigerant from the compression chamber 60; And
An oil separator 100 communicating with the discharge chamber 70,
The oil separator 100 is composed of a bent flow path 110 penetrating the rear casing 12 of the compressor in the thickness direction,
Branch points of the bent flow path 110 is disposed in the vertical downward position of the rear casing 12,
The bent flow path 110 includes a primary oil separation chamber 120 penetrating the rear casing 12 in a vertical downward direction;
A secondary oil separation chamber 130 penetrating obliquely upward from the bottom of the primary oil separation chamber 120; And
Oil separator of the scroll compressor, characterized in that consisting of a confluence space 140 to enable the communication between the lower end of the primary oil separation chamber 120 and the lower end of the secondary oil separation chamber (130).

delete

The method according to claim 1,
The primary oil separation chamber (120) is an oil separation device of a scroll compressor, characterized in that for forming the refrigerant discharge passageway (122) for communication with the discharge chamber (70).

The method according to claim 1,
The primary oil separation chamber 120 is formed by closing the remaining space except for the traffic portion with the secondary oil separation chamber 130 in a state passing through the rear casing 12 from the installation portion of the relief valve. Oil separator of scroll compressor.

The method according to claim 1,
The secondary oil separation chamber 130 is oil separation apparatus of the scroll compressor, characterized in that bent at an acute angle with respect to the primary oil separation chamber (120).

The method according to claim 1,
At least one of the primary oil separation chamber (120) and the secondary oil separation chamber (130) is disposed so as to pass through the center of the rear casing (12).

The method according to claim 1,
The confluence space 140 is the oil separation device of the scroll compressor, characterized in that located on the lower end of the compressor based on the direction of gravity action.

A discharge chamber 70 receiving a compressed refrigerant from the compression chamber 60; And
An oil separator 100 communicating with the discharge chamber 70,
The oil separator 100 is composed of a bent flow path 110 penetrating the rear casing 12 of the compressor in the thickness direction,
Branch points of the bent flow path 110 is disposed in the vertical downward position of the rear casing 12,
The bent flow path 110 includes a primary oil separation chamber 120 penetrating the rear casing 12 in a vertical downward direction;
A secondary oil separation chamber 130 penetrating obliquely upward from the bottom of the primary oil separation chamber 120; And
Consists of a confluence space 140 to enable communication between the lower end of the primary oil separation chamber 120 and the lower end of the secondary oil separation chamber 130,
The bent flow path 110 is the oil separation device of the scroll compressor, characterized in that to form a spiral groove on the inner peripheral surface.