KR20180101901A - Scroll compressor - Google Patents

Abstract

Disclosed is a scroll compressor comprising: a casing; a driving unit having a stator and a rotor for generating rotary power in the casing and a rotary shaft connected to the rotor; and a compression unit for receiving the rotary power of the rotary shaft and compressing refrigerant. The compression unit comprises: a first scroll connected with the rotary shaft to be rotated; a main frame having an intermediate pressure chamber having a space adjacent to the first scroll to receive oil supplied from the rotary shaft, the main frame supporting the first scroll to rotate; and a second scroll engaging with the first scroll to form a compression chamber in which the refrigerant is compressed, wherein the second scroll makes the compression chamber and the intermediate pressure chamber communicate with each other and has a back pressure and oil feeding passage to supply refrigerant pressing the first scroll to the intermediate pressure chamber and supply oil to the compression chamber. Therefore, the present invention can realize a simple oil passage structure penetrating the first and second scrolls.

Description

[0001] SCROLL COMPRESSOR [0002]

The present invention relates to a scroll compressor for compressing a refrigerant by a volume change of a compression chamber formed by rotating a pair of scrolls.

Generally, a compressor is applied to a vapor compression type refrigeration cycle (hereinafter abbreviated as a refrigeration cycle) such as a refrigerator or an air conditioner. The compressor is generally referred to as a closed compressor in the case where the driving section, which is an electric motor, and the compression section operated by the driving section are provided together in the inner space of the hermetically sealed casing, and the case in which the motor section is separately provided outside the casing is referred to as an open compressor have. Most of the refrigeration appliances for home use or commercial use are hermetically sealed compressors.

Compressors can be divided into reciprocating, rotary, and scroll types depending on the method of compressing the refrigerant. Among them, the scroll compressor is a system in which a pair of compression chambers formed by a suction chamber, an intermediate pressure chamber, and a discharge chamber are formed between the fixed scroll and the orbiting scroll, thereby continuously compressing the refrigerant.

Further, the compressor may be classified into an upper compression type or a lower compression type depending on the positions of the driving portion and the compression portion. The upper compression type is a method in which the compression portion is located above the transmission portion and the lower compression type is a compression compression portion is located below the transmission portion.

Generally, in a scroll compressor constituted by a lower compression type, a main frame and a fixed scroll are fixedly positioned inside a casing, and the orbiting scroll is positioned and rotated inside the casing. In the main frame, a back pressure chamber for pressurizing the orbiting scroll to keep it in engagement with the fixed scroll is formed. At this time, the refrigerant forming the pressure of the back pressure chamber is supplied from the intermediate pressure chamber by the back pressure passage passing through the fixed scroll.

On the other hand, the orbiting scroll is frictionally rotated between the main frame and the fixed scroll, and oil is supplied to the friction surfaces for lubrication. The oil is stored in the casing and then sucked along the rotating shaft to be supplied to the friction surfaces and then recirculated to the oil storage space inside the casing. At this time, in order to supply the refrigerant from the rotary shaft to the friction surfaces, an oil passage passing through the fixed scroll or the orbiting scroll is formed.

As described above, the back pressure passage or the oil passage formed in the structure passing through the main frame, the fixed scroll, or the orbiting scroll has a structure in which a hole communicating with each other in a plurality of directions is passed through and a sealing member insertion Process. This fabrication process is not only time consuming and costly, but can also have an adverse effect on the strength and operational reliability of the upper components which are exposed to the high pressure and friction of the refrigerant and which require precise alignment and displacement.

In such a situation, there is a demand for a flow path designing method which can minimize the machining process of the fixed or orbiting scroll and can effectively achieve back pressure formation and oil supply.

SUMMARY OF THE INVENTION The first object of the present invention is to provide a scroll compressor which can minimize the scroll through process by integrating a flow path for forming the intermediate pressure in the intermediate pressure chamber and a flow path for oil supply.

A second object of the present invention is to provide a scroll compressor in which a flow path for supplying oil to the inside of the intermediate pressure chamber and to the friction surfaces is simplified.

A third object of the present invention is to provide a scroll compressor in which a flow passage for supplying oil into the intermediate pressure chamber can be formed without machining the first scroll.

In order to accomplish the above object, according to the present invention, there is provided a hermetic compressor including: a casing; A stator and a rotor accommodated in the casing, and a rotating shaft connected to the rotor; And a compression unit for compressing the refrigerant by receiving the rotational force of the rotary shaft, wherein the compression unit includes: a first scroll rotating in connection with the rotary shaft; A main frame having a space adjacent to the first scroll and having an intermediate pressure chamber for receiving oil supplied from the rotation shaft, the main frame rotatably supporting the first scroll; And a compression chamber in which the refrigerant is compressed by being engaged with the first scroll, and a refrigerant which pressurizes the first scroll is connected to the compression chamber and the intermediate pressure chamber so as to be connected to the intermediate pressure chamber side, And a second scroll including a back pressure-lubricating passage adapted to supply oil.

According to a second aspect of the present invention, there is provided a hermetic compressor including: a rotary shaft; A drive unit for driving the rotation shaft; And a compression unit connected to the rotation shaft to compress the refrigerant, the compression unit including first and second scrolls and a main frame having an intermediate pressure chamber for pressing the first scroll, A first scroll hard plate extending in the radial direction of the rotating shaft; And a lubricant passage formed to pass through the first scroll hard plate portion and supply the oil flowing out from the rotary shaft to the intermediate pressure chamber.

In this case, the first scroll includes a first scroll hard plate extending in the radial direction of the rotary shaft, and the oil supply channel includes a first oil filler port formed on one surface of the first scroll hard plate portion adjacent to the intermediate- ; And a second oil filler formed on the other surface of the first scroll hard plate portion facing the compression chamber.

The first scroll may further include an outlet groove formed in the first scroll end plate portion and extending from the first scroll end plate portion toward the intermediate pressure chamber so as to communicate with the oil supply passage .

Wherein the compression unit includes a discharge pressure chamber formed by a space surrounding an outer peripheral surface of a rotary shaft between the main frame and the first scroll, the rotary shaft is formed to be recessed in an outer peripheral surface facing the main frame, And an oil groove extending to communicate with the oil groove.

The oil supply passage may include an inlet groove formed in the bottom surface of the discharge pressure chamber and positioned adjacent to the rotary shaft.

The second scroll is provided with a second scroll hard plate portion extending in the radial direction of the rotation axis and through which the back pressure-lubricant passage is formed. The back-pressure-lubricant passage is communicated with the second scroll hard plate portion And an intermediate pressure hole formed in the intermediate pressure hole.

Further, the intermediate pressure hole may be communicated with a compression chamber in which the pressure is changed within a range including a predetermined target pressure value of the intermediate pressure chamber during one revolution of the first scroll.

The second scroll includes a side wall portion extending in the axial direction of the rotary shaft so as to be adjacent to the intermediate pressure chamber and through which the back pressure-oil supply passage is formed, and the back pressure-oil supply passage is formed to communicate with the intermediate pressure chamber And an oil supply hole may be provided.

In particular, the refueling hole may be located at the bottom of the intermediate pressure chamber.

In order to achieve the third object of the present invention, the hermetic compressor according to the present invention comprises: a rotary shaft; A drive unit for driving the rotation shaft; And a compression unit connected to the rotary shaft to compress the refrigerant, the compression unit including first and second scrolls and a main frame having an intermediate pressure chamber for pressing the first scroll, And an oil supply passage formed through the main frame to supply the oil to be discharged to the intermediate pressure chamber.

At this time, the main frame includes a bearing surface formed to surround the rotation shaft and supporting the rotation shaft so as to be rotatable; And a sealing portion located on the upper side of the bearing surface and formed on an inner circumferential surface facing the rotation shaft.

Meanwhile, a pressure-reducing member formed to close a part of the oil supply passage may be inserted into the oil supply passage.

On the other hand, the scroll compressor according to the present invention comprises a casing; A stator and a rotor accommodated in the casing, and a rotating shaft connected to the rotor; And a compression unit for compressing the refrigerant by receiving the rotational force of the rotary shaft, wherein the compression unit includes: a first scroll connected to the rotary shaft and rotated; A second scroll that engages a lower surface of the first scroll to form a compression chamber and overlaps the first scroll to receive a portion of the first scroll; A main frame having an intermediate pressure chamber which is coupled to the second scroll by overlapping the first scroll on the upper side, the intermediate pressure chamber comprising a space adjacent to the first and second scrolls; A lubricant passage formed to pass through the first scroll or the second scroll and supplying the oil flowing out from the outer peripheral surface of the rotary shaft to the intermediate pressure chamber; And a back pressure-lubricant passage formed through the second scroll to communicate the compression chamber and the intermediate pressure chamber.

According to the present invention constituted by the solution means described above, the following effects can be obtained.

First, since the scroll compressor of the present invention includes the back pressure-oil supply passage that integrates the oil for the back pressure and the oil supply passage, the cost loss due to the processing and assembly process of forming the oil passage in the main frame or the scroll can be reduced have. In addition, since the oil can be supplied to the intermediate pressure chamber, the oil supply can be smoothly performed on the friction surface of the overhanging so that the operation reliability can be improved. In addition, the noise generated in the overhauling can be reduced.

Secondly, in the scroll compressor of the present invention, since the oil is supplied through the oil supply passage formed in the first scroll and the first and second oil fillers, the friction surfaces formed on the upper and lower portions of the first scroll are all lubricated, Can be reduced.

Further, since the outlet groove is formed at the end portion of the oil supply passage on the side of the intermediate pressure chamber, the first oil supply port can be smoothly lubricated without closing the main oil supply port.

Further, since the end portion on the side of the rotation axis of the oil supply passage is located in the stepped space between the main bearing portion and the eccentric portion of the rotation shaft, smooth oil supply can be realized and the rotation behavior of the first scroll can be stabilized.

On the other hand, since the oil is supplied through the intermediate pressure hole formed in the end plate portion of the second scroll of the back pressure-oil supply passage, lubricating action can be performed in the lower portion of the compression chamber. Both of the friction surfaces between the first scroll and the second scroll can be lubricated by the second oil hole and the intermediate pressure hole.

Further, the intermediate pressure hole may be located at a point where pressure is formed within a range including a predetermined target pressure value of the intermediate-pressure chamber among the compression chamber spaces. Thus, while the scroll compressor of the present invention is operated in the steady state, the lubrication in one direction and the supply of refrigerant in the other direction can be alternately performed through the back pressure-lubrication passage.

Further, the back pressure-oil supply passage communicates with the intermediate pressure chamber through the oil supply hole, so that the oil passage process for the main frame can be omitted. Therefore, the machining cost can be reduced and the structural strength deterioration can be prevented.

Particularly, the oil supply hole is located on the bottom surface of the lower portion of the intermediate pressure chamber, so that the oil filled in the intermediate pressure chamber can be easily supplied to the back pressure-oil supply passage.

Thirdly, in the scroll compressor of the present invention, since the oil supply passage for supplying oil to the intermediate pressure chamber is formed in the main frame, the machining of the first scroll rotated against the high pressure refrigerant can be minimized. That is, the factor that the strength of the first scroll may be lowered can be eliminated, and safety and reliability can be improved.

When the oil supply passage is formed in the main frame, a sealing portion is formed at the outer end of the main frame, so that the pressure of the refrigerant in the intermediate-pressure chamber is reduced.

1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention;
2 is an enlarged view showing a region A shown in Fig.
Figure 3 is a perspective view of the first scroll shown in Figure 2;
4 is an enlarged cross-sectional view of a compression unit of a scroll compressor according to another embodiment of the present invention.
5 is an enlarged cross-sectional view of a compression unit of a scroll compressor according to another embodiment of the present invention.
6 is an enlarged view showing a region B shown in Fig.
FIG. 7A is a sectional view showing the pressure-reducing member shown in FIG. 5; FIG.
FIG. 7B is a sectional view showing the pressure-reducing member shown in FIG. 2. FIG.

Hereinafter, a scroll compressor according to the present invention will be described in detail with reference to the drawings.

In other respects, the same or similar reference numerals are given to the same or similar components to those of the previous embodiment, and a duplicate description thereof will be omitted.

In the following description of the embodiments of the present invention, a detailed description of known related arts will be omitted when it is determined that the gist of the embodiments disclosed in the present specification may be obscured.

It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention, It should be understood that it includes water and alternatives.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

FIG. 1 is a longitudinal sectional view of a scroll compressor 100 according to an embodiment of the present invention, and FIG. 2 is an enlarged view showing a region A shown in FIG. As shown in FIG. 1, the scroll compressor 100 of the present embodiment may be configured as a lower compression type. In addition, as shown in the figure, the scroll compressor (100) of the present embodiment includes a high-pressure structure in which an external refrigerant is directly introduced into the compression chamber (V) Lt; / RTI > However, the scroll compressor (100) according to the present invention is not necessarily limited to a compressor of a lower compression type and a high pressure type.

1 and 2, a scroll compressor 100 according to the present invention includes a casing 110, a driving unit 120, and a compression unit (first and second scrolls 130 and 140, a main frame 150, Quot;).

The casing 110 forms a closed space. In the present embodiment, the high pressure internal space of the casing 110 may be a discharge space in which a refrigerant compressed and discharged in a compression chamber V described later stays. The casing 110 includes a cylindrical shell 111 extending in one direction, an upper shell 112 covering the upper portion of the cylindrical shell 111 and a lower shell 112 covering the lower portion of the cylindrical shell 111, (113).

A suction passage 170 is formed through the cylindrical shell 111 so as to communicate directly with the compression chamber V in the compression unit to be described later and communicates with the inner space of the casing 110 at the upper end of the upper shell 112. [ A discharge flow path 180 may be provided. The discharge passage 180 may be disposed in the axial direction of the rotating shaft 125.

The driving unit 120 includes a stator 121 and a rotor 122, and a rotating shaft 125. A stator 121 which can be positioned to be fixed to the casing 110 and a rotor 122 which is spaced apart from the stator 121 and connected to the rotating shaft 125 at a central portion generates a rotating force by power supply. That is, the stator 121 and the rotor 122 function as an electric motor. The specific structure and function of the rotating shaft 125 will be described later.

On the other hand, the compression unit includes first and second scrolls (130, 140) and a main frame (150). The compression unit performs a function of compressing the refrigerant flowing in from the suction passage (170). 1, the main frame 150 is fixed to the inner circumferential surface of the casing 110 and the second scroll 140 is fixed to the inner circumferential surface of the casing 110 at the lower side of the main frame 150, And is fixed to the lower end of the main frame 150. The first scroll 130 is connected to the rotation shaft 125 and rotates inside the main frame 150 and the second scroll 140.

The first scroll 130 corresponds to the orbiting scroll of the scroll compressor 100 of the present invention. The first scroll 130 includes a first scroll end plate 131 extending in the radial direction of the rotation shaft 125 to have a substantially disk shape and a first scroll end plate 131 extending from the lower surface of the first scroll end plate 131, ). The rotation axis connecting portion 133 may be formed at the center of the orbiting wrap 132 and the first scroll end plate 131 to be coupled to the eccentric portion 125c of the rotating shaft 125 described later.

The second scroll 140 includes a second scroll hard plate portion 141 extending in the radial direction of the rotation shaft 125 so as to have a substantially disk shape and a second scroll hard plate portion 141 protruding from the upper surface of the second scroll hard plate portion 141, 1 scroll 130 to form a compression chamber V by engaging with the orbiting wrap 132 of the scroll 130. [ The scroll member may further include a scroll sidewall portion 143 protruding from the upper surface of the second scroll hard plate portion 141 and extending in the circumferential direction of the rotation shaft 125 so as to surround the fixed lap 142. [ In the high-pressure scroll compressor 100 of the present embodiment, the above-described suction passage 170 may be formed so as to pass through the scroll sidewall portion 143.

The second scroll 140 may be formed at the center thereof with a scroll bearing 144 formed to penetrate the rotary shaft 125. The hard bearing portion of the second scroll 140 may be compressed And a discharge port 145 for discharging the refrigerant may be formed. The position of the discharge port 145 can be set in consideration of a required discharge pressure or the like.

On the other hand, as shown in FIG. 1, a discharge cover 160, which receives the discharged refrigerant, may be coupled to the bottom surface of the second scroll 140. The discharge cover 160 may be sealed to the bottom surface of the second scroll 140 to separate the refrigerant discharged from the compression chamber V and the oil storage space 115.

The main frame 150 rotatably supports the rotation shaft 125 and the first scroll 130. The main frame 150 includes a frame rigid portion 151 having a substantially disk shape, a frame side wall portion 152 projecting downward from the outer periphery of the frame rigid portion 151, May be provided on the upper surface of the frame shaft 153.

At this time, the outer peripheral portion of the frame side wall portion 152 is coupled to the inner peripheral surface of the cylindrical shell 111, and the lower end portion thereof can be engaged with the upper end portion of the scroll side wall portion 143. The frame shaft 153 may protrude from the upper surface of the frame rigid portion 151 toward the drive unit 120 side. The bearing surface 153a may be formed on the inner peripheral surface of the frame bearing 153 so as to be rotatable.

The lower part of the rotating shaft 125 is coupled to the main frame 150 and the second scroll 140 so that the lower part of the rotating shaft 125 can be supported in the radial direction have.

A main bearing portion 125a inserted into the frame bearing member 153 of the main frame 150 and supported radially by the bearing surface 153a may be formed on the lower portion of the rotating shaft 125. [ A sub bearing portion 125b may be formed on the lower side of the main bearing portion 125a to be inserted into the scroll bearing portion 144 of the second scroll 140 to be supported in the radial direction.

An eccentric portion 125c may be formed between the main bearing portion 125a and the sub-bearing portion 125b to be inserted into the rotation shaft coupling portion 133 of the first scroll 130. [ That is, the main bearing portion 125a and the sub bearing portion 125b are positioned coaxially with each other, and the eccentric portion 125c is radially eccentric with respect to the main bearing portion 125a or the sub bearing portion 125b .

An oil supply passage 125d for supplying oil to the main and sub bearing portions 125a and 125b and the eccentric portion 125c may be formed inside the rotary shaft 125. [ The oil supply passage 125d is formed at the lower end or intermediate height of the stator 121 at the lower end of the rotary shaft 125 or at the lower end of the upper end of the main bearing portion 125a as the compression unit is positioned below the drive unit 120 It can be formed into a groove with a high height.

An oil feeder 126 for pumping oil filled in the oil storage space 115 may be coupled to the lower end of the rotary shaft 125, that is, to the lower end of the sub bearing portion 125b. The oil feeder 126 includes an oil supply pipe 126a inserted into the oil supply passage 125d of the rotary shaft 125 and an oil supply pipe 126b inserted into the oil supply pipe 126a, Member 126b. The oil supply pipe 126a may be positioned so as to pass through the discharge cover 160 and to be submerged in the oil storage space 115. [

The oil pumped to the upper side may flow through the oil supply passage 125d and some may flow out from the sub bearing portion 125b to the outer peripheral surface thereof and the other portion may flow out from the rotary shaft coupling portion 133 to the outer peripheral surface thereof. Further, another portion is supplied to the bearing surface 153a on the inner side of the bearing bearing 153 of the main frame 150 from the main bearing portion 125a and flows along the oil groove 125a ' May be supplied to the discharge pressure chamber 154, which will be described later.

In addition, a balance weight 127 for suppressing noise and vibration may be coupled to the rotary shaft 125 or the rotor 122.

The scroll compressor 100 according to the present embodiment operates as follows.

When power is applied to the driving unit 120, a rotating force is generated in the rotor 122 and the rotating shaft 125 to rotate. As the rotating shaft 125 rotates, the eccentric portion 125c of the rotating shaft 125 The combined first scroll 130 is pivotally moved by the above-mentioned bearing 190.

The refrigerant supplied from the outside of the casing 110 through the suction passage 170 flows into the compression chamber V. The refrigerant is continuously generated by the pivotal movement of the first scroll 130, In the compression chamber (V). That is, the refrigerant is moved from the suction passage 170 to the discharge port 145 side through the suction chamber, the intermediate pressure chamber, and the discharge chamber and is compressed. The refrigerant is discharged to the inner space of the discharge cover 160 through the discharge port 145.

The refrigerant discharged to the inner space of the discharge cover 160 circulates through the inner space of the discharge cover 160 and flows into the communication hole formed through the second scroll 140 and the main frame 150 after the noise is reduced 116 and may be moved to a space between the main frame 150 and the drive unit 120. [ Then, the coolant may be discharged through the drive unit 120 to the discharge passage 180 on the upper portion of the casing 110.

Hereinafter, one embodiment of the scroll compressor 100 according to the present invention configured to perform lubrication and back pressure formation at a time will be described.

1 and 2, the main frame 150 of the scroll compressor 100 according to the present embodiment includes a first scroll 130 and a second scroll 130, 140) is formed in the back pressure chamber.

Specifically, the back pressure chamber is formed as a space adjacent to the first scroll 130. In particular, as shown in Figs. 1 and 2, the back pressure chamber is composed of a discharge pressure chamber 154 formed adjacent to the rotation shaft 125 and an intermediate pressure chamber 155 formed adjacent to the frame side wall portion 152 have.

The discharge pressure chamber 154 surrounds the outer peripheral surface of the rotating shaft 125 and may be formed between the first scroll 130 and the main frame 150. 2, the first scroll 130 may be formed to be recessed downward from the upper surface adjacent to the rotation shaft 125 to form a space for the discharge pressure chamber 154. As shown in FIG. The space of the discharge pressure chamber 154 communicates with the discharge space through a space between the bearing surface 153a of the frame bearing member 153 of the main frame 150 and the main bearing portion 125a of the rotating shaft 125, Pressure can be formed. Or may be configured to communicate with the oil groove 125a 'formed in the main bearing portion 125a to receive oil from the oil storage space 115 having the discharge pressure.

The intermediate pressure chamber 155 may be recessed from the lower surface of the main frame 150 so as to be adjacent to the upper surface and the outer peripheral surface of the first scroll 130. That is, the intermediate pressure chamber 155 may be formed in a substantially annular space. In this case, the intermediate pressure chamber 155 is provided with an oar ring 190 (not shown), which prevents rotation of the first scroll 130, Can be mounted.

A sealing member 156 inserted into the sealing groove 131a formed on the upper surface of the first scroll 130 may be positioned between the discharge pressure chamber 154 and the intermediate pressure chamber 155. The sealing member 156 serves to form different pressure spaces so that the discharge pressure chamber 154 and the intermediate pressure chamber 155 can press the central portion and the outer peripheral portion of the first scroll 130 with different back pressures do.

In addition, in the intermediate pressure chamber 155 of the scroll compressor 100 according to the present invention, the oil sucked from the rotating shaft 125 is stored. The oil is supplied to fill the intermediate-pressure chamber 155 and may be supplied to the surface of the otal bearing 190 or the friction surface of the first scroll 130 adjacent to the intermediate-pressure chamber 155.

The second scroll 140 of the scroll compressor 100 according to the present embodiment is provided with a back pressure-oil supply passage 146 functioning to supply a medium pressure refrigerant to the intermediate pressure chamber 155. To this end, one end of the back pressure-oil supply passage 146 communicates with the intermediate pressure chamber 155 and the other end communicates with the compression chamber V. [

In particular, in the scroll compressor (100) of the present invention, the back pressure-oil supply passage (146) is configured to exchange oil and refrigerant between the intermediate pressure chamber (155) and the compression chamber (V). More specifically, the medium pressure refrigerant is supplied from the compression chamber V to the intermediate pressure chamber 155 by the back pressure-oil supply passage 146, and the oil is supplied from the intermediate pressure chamber 155 to the compression chamber V .

Specifically, at the beginning of the operation of the scroll compressor 100 according to the present invention, the refrigerant pressure of the compression chamber V is raised first. That is, the refrigerant pressure in the compression chamber (V) is formed to be higher than that in the intermediate pressure chamber (155), so that the intermediate pressure refrigerant can be supplied to the intermediate pressure chamber (155) from the compression chamber (V). The refrigerant supplied to the intermediate pressure chamber 155 can pressurize the first scroll 130 to form a pressure for sealing the compression chamber (V).

When the operation of the scroll compressor 100 according to the present invention continues, the refrigerant of the discharge pressure flows through the discharge space of the discharge port 145 and the discharge cover 160 and the inner space of the casing 110 through the communication hole 116, . Accordingly, the oil storage space 115 under the casing 110 is pressurized, and oil is sucked by the rotation of the oil feeder 126 to supply oil to the intermediate pressure chamber 155. As a result, the pressure of the intermediate-pressure chamber 155, which corresponds roughly to the discharge pressure, can be made larger than the pressure of the compression chamber V communicated at the point having the intermediate pressure. In this case, the oil stored in the intermediate pressure chamber 155 can be supplied to the compression chamber V. [ The refrigerant supplied to the compression chamber (V) can be used to lubricate the friction surfaces of the first scroll (130) and the second scroll (140).

As described above, the back pressure-oil supply passage 146 can perform both refrigerant supply and oil supply in accordance with the pressure difference between the intermediate pressure chamber 155 and the compression chamber (V). Compared with the structure in which the intermediate pressure chamber 155 side is provided with a passage for supplying the intermediate pressure refrigerant and the passage for supplying the oil to the compression chamber V side, Can be saved. Furthermore, there is an advantage that the reliability of the operation can be improved by reducing the factors that the strength of the main frame 150 and the first or second scroll 130, 140 accommodating therein the high-pressure refrigerant can be lowered.

In addition, oil can be supplied to the intermediate pressure chamber 155 in the scroll compressor 100 according to the present invention. Thus, the lubricating operation can be performed up to the outer ring of the o-ring 190, the frame side wall 152 of the main frame 150, and the outer circumference of the first scroll 130, and further, .

 In order to perform lubrication through the intermediate pressure chamber 155 in the scroll compressor 100 of the present invention, a lubricant supply passage 134 is formed so that the oil absorbed through the oil supply passage 125d of the rotary shaft 125 Pressure chamber 155, as shown in FIG.

2, the oil supply passage 134 may be formed through the first scroll 130 in this embodiment. Specifically, the oil supply passage 134 may be formed by penetrating the first scroll hard plate portion 131 in the radial direction of the rotation shaft 125.

In addition, the oil supply passage 134 formed in the first scroll 130 may include first and second oil fillers 134a and 134b. As shown in FIG. 3, the first filler port 134a may be formed on the upper surface of the first scroll hard plate portion 131 adjacent to the intermediate pressure chamber 155. The oil flowing along the oil supply passage 134 can be continuously supplied to and stored in the intermediate pressure chamber 155 through the first oil supply port 134a and is supplied to the compression chamber V .

On the other hand, the second oil hole 134b may be formed on a lower surface of the first scroll hard plate portion 131 facing the compression chamber (V). A part of the oil flowing along the oil supply passage 134 can be supplied to the compression chamber V through the second oil supply port 134b. The second oil hole 134b is formed in the lower surface of the first scroll hard plate portion 131 so that oil is supplied to a portion of the second scroll 140 which slides on the end of the fixed lap 142, . That is, the second oil supply port 134b supplies oil to the friction surface formed on the upper portion of the compression chamber V. This is because the intermediate pressure hole 146a of the back pressure-oil supply passage 146, which will be described later, May be different from the position where the oil is supplied to the friction surface formed at the lower portion of the piston.

The oil supply passage 134 of the present embodiment penetrates the first scroll 130 and the oil is supplied to the inside of the intermediate pressure chamber 155 and the upper portion of the compression chamber V via the first and second oil supply ports 134a, The upper and lower surfaces of the first scroll 130 forming the rotating body of the scroll compressor 100 of the present invention can be all lubricated. Such a structure can contribute to an increase in efficiency of the scroll compressor 100 according to the present invention. Further, this structure allows the oil supplied to the intermediate pressure chamber 155 to share the flow path formed in the conventional orbiting scroll (the first scroll 130) according to the present invention, .

FIG. 3 is a perspective view showing the first scroll 130 shown in FIG. 2, and FIG. 4 is an enlarged cross-sectional view of a compression unit of a scroll compressor according to another embodiment of the present invention. 2 to 4, when the oil supply passage 134 is formed in the first scroll 130 according to the embodiment of the present invention and the other embodiment, the oil supply passage 134 inlet and outlet for smooth oil supply, Side structure will be described.

First, referring to FIG. 3, the first scroll 130 of the present embodiment may further include an outlet groove 135. [ The outlet groove 135 functions to smoothly supply the oil, which has passed through the oil supply passage 134, to the intermediate pressure chamber 155. The outlet groove 135 is recessed from the upper surface of the first scroll hard plate 131 facing the intermediate pressure chamber 155 and the first oil fill port 134a is connected to the outlet groove 135 to communicate with the oil supply passage 134. [ As shown in FIG. The outlet groove 135 may extend from the outer circumferential surface of the end plate of the first scroll 130 to form a space that opens in the radial direction of the rotating shaft 125.

An outlet groove 135 communicating with the end portion of the oil supply passage 134 on the side of the intermediate pressure chamber 155 is formed so that the position of the first oil supply port 134a communicating with the oil supply passage 134 and the intermediate pressure chamber 155 Can be variously designed. For example, even when the first oil hole 134a is formed at a position where it is covered with the sealing ring 190 or the main frame 150, the oil flows through the outlet groove 135 to the outer peripheral surface of the first scroll 130 To be supplied to the intermediate-pressure chamber 155.

Next, referring to FIGS. 2 and 4, the inlet side structure of the oil supply passage 134 for smoothly introducing oil from the rotary shaft 125 can be confirmed.

In one embodiment of FIG. 2, the first scroll 130 may have an inlet hole 136. The inlet hole 136 may be positioned on the upper surface of the first scroll end plate 131 to communicate with the discharge pressure chamber 154. Thereby, high-pressure oil flowing from the rotating shaft 125 can be introduced into the inlet hole 136.

In another embodiment of FIG. 4, the first scroll 130 may have an inlet groove 236. The inlet groove 236 is positioned so that the oil flowing out of the rotating shaft 125 can flow smoothly into the oil supply passage 134. Specifically, the inlet groove 236 forms an end portion of the oil supply passage 234, and may be positioned adjacent to the eccentric portion 125c of the rotary shaft 125 in the discharge pressure chamber 154 as well.

The main bearing part 125a is supported by the frame bearing part 153 of the main frame 150 and may be formed to have a larger diameter than other parts of the rotation shaft 125 as shown in FIG. That is, the main bearing portion 125a may have a shape protruding from the outer peripheral surface of the rotation shaft 125. [ 2 and 3, an oil groove 125a 'is formed in the main bearing portion 125a so that the oil taken up by the oil supply passage 125d flows to be supplied to the outer peripheral surface of the main bearing portion 125a .

The eccentric portion 125c may be formed to have a diameter slightly larger than that of the other portion of the rotation shaft 125 as shown in FIG. The eccentric part 125c may be fixed to the first scroll 130 so as to be fixed to each other so that the rotational force of the drive unit 120 may be supplied to the first scroll 130. [

Due to the characteristic structures of the main bearing portion 125a and the eccentric portion 125c, a stepped space is formed between the main bearing portion 125a and the eccentric portion 125c as shown in Figs. 1, 2 and 5 . This space can form a part of the discharge pressure chamber 154 described above and the oil descended through the oil groove 125a 'formed on the outer peripheral surface of the main bearing portion 125a can be accumulated in the stepped space.

The inlet groove 236 of the oil supply passage 234 is positioned adjacent to the eccentric portion 125c at the bottom of the upper space so that the oil accumulated in the oil passage 233 can flow smoothly into the oil supply passage 234 do. The inlet groove 236 is spaced apart from the inner circumferential surface of the first scroll 130 facing the eccentric portion 125c while communicating with the oil supply passage 234 extending in the radial direction of the rotary shaft 125, ≪ / RTI >

As a result, the oil in the oil storage space 115 moves upward through the oil feeder 126 and the oil supply passage 125d, flows to the outer peripheral surface of the rotating shaft 125, flows on the oil groove 125a ' Can be introduced into the oil supply passage 234 through the inlet groove 236 between the main bearing portion 125a and the eccentric portion 125c and the intermediate pressure chamber 155 and the compression chamber V ) Can be continuously supplied. In addition, since the oil flows continuously through the inlet groove 236, the behavior of the first scroll 130 connected to the rotating shaft 125 can be stabilized.

In the following, the structure of the back pressure-oil supply passage 146 will be described in detail with reference to FIGS. The back pressure-oil supply passage 146 formed in the second scroll 140 of the scroll compressor 100 in accordance with the present invention communicates with the intermediate pressure chamber in the compression chamber V to supply the refrigerant to the intermediate pressure chamber 155 have.

Specifically, the intermediate pressure hole 146a may be formed on the upper surface of the second scroll hard plate portion 141. [ As described above, on the upper side of the second scroll hard plate portion 141, there is a compression chamber V formed by the first scroll hard plate portion 131, the orbiting wrap 132, and the fixed lap 142. The intermediate pressure hole 146a can be positioned to communicate the back pressure-oil supply passage 146 and the compression chamber V with each other at an intermediate pressure point where an appropriate pressure can be formed inside the intermediate pressure chamber 155. [

Particularly, the intermediate pressure hole 146a is located at a point where the pressure is changed within a range including a predetermined target pressure value of the intermediate pressure chamber 155 during one revolution of the first scroll 130, Lt; / RTI > That is, while the first scroll 130 makes one revolution movement, the pressure in the compression chamber V at a point communicating with the intermediate pressure hole 146a is higher than the pressure in the intermediate pressure chamber 155 in some sections, The process of maintaining the pressure of the compression chamber V at the point communicating with the intermediate pressure hole 146a lower than the pressure of the intermediate pressure chamber 155 may be repeated. Thus, while the scroll compressor (100) of the present invention is operated at a constant speed, the lubrication in one direction and the supply of the coolant in the other direction can be alternately performed through the back pressure-lubrication passage (146) .

The oil in the intermediate pressure chamber 155 is communicated with the compression chamber V by communicating with the compression chamber V through the intermediate pressure hole 146a formed in the second scroll hard plate portion 141, Can be supplied to the lower friction surface. Specifically, the second scroll end plate 141 and the orbiting wrap 132 of the first scroll 130 can be supplied to the surfaces where they are frictioned with each other. When both the second oil hole 134b and the intermediate pressure hole 146a are provided as described above, oil can be supplied to the upper and lower sides of the compression chamber V to perform lubricating action, Reduction can be effectively achieved.

The end of the back pressure-oil supply passage 146 on the side of the intermediate pressure chamber 155 may be formed by the oil supply hole 146b of the second scroll 140. 2 and 3, the intermediate pressure chamber 155 is formed in the upper surface of the scroll side wall portion 143 of the second scroll 140 and the upper side of the scroll side wall portion 143 adjacent to the frame side wall portion 152 of the main frame 150 Shape. That is, the scroll sidewall portion 143 may be formed adjacent to the intermediate pressure chamber 155.

In this structure, if the oil supply hole 146b is formed through the scroll side wall portion 143, the back pressure-oil supply passage 146 can be formed without the oil passage process to the main frame 150. [ That is, the oil supply passage 134 through which the oil is supplied from the rotary shaft 125 is formed to communicate with the intermediate pressure chamber 155 through the first scroll 130, and between the intermediate pressure chamber 155 and the compression chamber V And the intermediate pressure formation may be performed by the back pressure-oil supply passage 146 passing through the second scroll 140. [ Therefore, the flow path cost reduction or the structural strength reduction prevention for the main frame 150 can be achieved.

The positions of the intermediate pressure chamber 155 and the oil supply hole 146b as described above are set so that oil is supplied from the intermediate pressure chamber 155 to the compression chamber V through the back pressure- Lt; / RTI > Specifically, the oil supply hole 146b may be located at the bottom of the space of the intermediate-pressure chamber 155, as shown in Figs. The oil filling hole 146b is formed on the upper surface of the scroll sidewall portion 143 of the second scroll 140 which is the bottom surface of the intermediate pressure chamber 155. Thus, - can be easily supplied to the oil supply passage (146).

The oil supply passage 134 passing through the first scroll 130 is formed in the intermediate pressure chamber 155 so as to supply oil to the scroll compressor 100 according to the present invention in the structure of the back pressure- One embodiment and another embodiment of the present invention have been described. Hereinafter, a structure in which oil is supplied to the intermediate pressure chamber 155 through the main frame 350 according to another embodiment of the present invention will be described.

FIG. 5 is an enlarged perspective view of a compression unit of a scroll compressor according to another embodiment of the present invention, and FIG. 6 is an enlarged view showing a region B shown in FIG.

In the scroll compressor according to another embodiment of the present invention, the intermediate pressure chamber 155 and the compression chamber V are communicated by the back pressure-oil supply passage 146, and the intermediate pressure formation and the oil supply And is performed together by the back pressure-oil supply passage 146.

In this embodiment, however, the oil supply passage 354 penetrating the main frame 350 is provided to supply the oil sucked by the rotary shaft 125 to the intermediate pressure chamber 155. The oil supply passage 354 may be formed so as to penetrate the frame end plate portion 351 of the main frame 350 in the radial direction of the rotation shaft 125 as shown in FIG.

At this time, an end near the rotating shaft 125 side of the oil supply passage 354 may be positioned between the main bearing portion 125a and the eccentric portion 125c as in the previous embodiment. Alternatively, in consideration of machinability and the like, the end of the oil supply passage 354 may be located on the bearing surface 153a of the main bearing portion 125a, as shown in Fig. The oil supply passage 354 communicates with a space formed by stepping with a smaller diameter than the main bearing portion 125a and the eccentric portion 125c, so that a smooth oil supply space can be secured.

In this embodiment, the oil supply passage 354 is formed in the main frame 350 instead of the first scroll 130 of the previous embodiment, so that the processing of the first scroll 130, which rotates in contact with the high-pressure refrigerant, Can be minimized. This means that the factor that the strength of the first scroll 130 may be lowered can be eliminated, so that this embodiment can be employed for improving the operation reliability of the scroll compressor 100 according to the present invention.

In the meantime, when the oil supply passage 354 is formed in the main frame 350 according to another embodiment of the present invention, the high pressure discharge space inside the casing 110 and the intermediate pressure chamber 155 through the oil supply passage 354, Can be communicated more directly than in the case of the previous embodiment. Such a structure may be difficult to maintain the predetermined intermediate pressure in the intermediate pressure chamber 155. [

Therefore, in another embodiment of the present invention, the sealing portion 353b may be provided on the bearing surface 353a formed on the inner peripheral surface of the frame bearing member 353 above the main frame 350. [ As shown in FIG. 6, the sealing portion 353b may be made to closely contact the rotating shaft 125 rather than the bearing surface 353a so as to surround the rotating shaft 125. The sealing portion 353b may have a shape of a labyrinth seal that is recessed on a surface facing the rotating shaft 125. [

When the pressure of the intermediate pressure chamber 155 is formed at an intermediate pressure, the discharged refrigerant is supplied to the bearing surface 353a in a state of higher pressure than the intermediate pressure by forming the sealing portion 353b in the other embodiment of the present invention, To the oil supply passage 354 through the oil passage 354.

Further, in another embodiment of the present invention, as the structure for maintaining the intermediate pressure of the intermediate pressure chamber 155, the pressure reducing member 354c shown in FIGS. 5 and 7A may be provided. Fig. 7A is a sectional view showing the pressure-reducing member 354c shown in Fig. The pressure reducing member 354c can be inserted into the oil supply passage 354 and can be formed so as to close a part of the end face of the oil supply passage 354. [ Specifically, as shown in FIG. 7A, the pressure-reducing member 354c has a diameter that can be press-fitted into the oil supply passage 354, and a part of the pressure-reducing member 354c is machined into a substantially D shape so as to be spaced apart from the oil supply passage 354 .

On the other hand, Fig. 7B is a sectional view showing the pressure-reducing member 134c shown in Fig. The pressure-reducing member 134c of the embodiment of the present invention has a cylindrical shape with a smaller diameter than the inner diameter of the oil supply passage 134, and can be reduced in pressure by closing a part of the oil supply passage 134. [ However, since the pressure-reducing member 134c of this embodiment may be disengaged from the oil supply passage 134 due to the pressure of oil, the fixing bolt 134d for supporting the pressure-reducing member 134c may be connected to the oil supply passage 134 As shown in Fig.

7A and 7B, the pressure of the oil passing through the oil supply passage 134 can be reduced by the Bernoulli's principle by the pressure-reducing member 134c whose cross section is shown. Therefore, even when oil is supplied from the discharge pressure chamber 154 having the discharge pressure or the oil supply passage 125d to the intermediate-pressure chamber 155, the pressure in the intermediate-pressure chamber 155 can be reserved at a predetermined intermediate pressure .

It is to be understood that the scope of the present invention is not limited to the above-described embodiments, and that the scope of the present invention is limited only by the scope of the present invention, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention.

100: Hermetic compressor 110: casing
111: cylindrical shell 112: upper shell
113: Lower shell 115: Reservoir space
120: drive unit 121:
122: rotor 125: rotating shaft
125a: main bearing portion 125a ': oil groove
125b: sub-bearing portion 125c: eccentric portion
125d: oil supply passage 126: oil feeder
126a: Oil supply pipe 126b: Oil suction member
127: Balance weight 130: 1st scroll
131: first scroll hard plate 131a: sealing groove
132: orbiting wrap 133:
134, 234, 354: Oil supply channel 134a: First oil supply port
134b: second oil well 134c, 354c: pressure reducing member
134d: Fixing bolt 135: Outlet groove
136: entrance hole 140: second scroll
141: second scroll end plate portion 142: orbiting wrap
143: engaging portion 143: scroll side wall portion
144: Scrolling axis number part 145:
146: back pressure - oil supply passage 146a: intermediate pressure hole
146b: lubrication hole 150, 350: main frame
151: frame plate portion 152: frame side wall portion
153: frame shaft number parts 153a, 353a: bearing surface
154: Discharge pressure chamber 155: Middle pressure chamber
156: sealing member 160: discharge cover
170: suction channel 180: discharge channel
190: o-ring 236: inlet groove
353b:

Claims (14)

Casing;
A stator and a rotor accommodated in the casing to generate a rotating force; a driving unit having a rotating shaft connected to the rotor and rotated; And
And a compression unit that receives the rotational force of the rotary shaft and compresses the refrigerant,
The compression unit includes:
A first scroll connected to the rotation shaft and configured to rotate;
A main frame having a space adjacent to the first scroll and having an intermediate pressure chamber for receiving oil supplied from the rotation shaft, the main frame rotatably supporting the first scroll; And
And a compression chamber in which the refrigerant is compressed by engaging with the first scroll, and a refrigerant which pressurizes the first scroll is connected to the compression chamber and the intermediate pressure chamber so that the refrigerant is supplied to the intermediate pressure chamber side, And a second scroll having a back pressure-oil supply passage configured to supply oil. The method according to claim 1,
Wherein the first scroll comprises:
A first scroll hard plate extending in a radial direction of the rotation shaft; And
And a lubricant passage formed in the first scroll hard plate portion to supply oil, which flows out from the rotary shaft, to the intermediate pressure chamber. 3. The method of claim 2,
Wherein the first scroll includes a first scroll hard plate portion extending in the radial direction of the rotation shaft,
The oil supply passage
A first oil filler port formed on one surface of the first scroll hard plate portion adjacent to the intermediate pressure chamber; And
And a second oil filler formed on the other surface of the first scroll hard plate portion facing the compression chamber. 3. The method of claim 2,
Wherein the first scroll is recessed from one surface of the first scroll hard plate portion toward the intermediate pressure chamber and extended to an outer circumferential surface of the first scroll hard plate portion and connected to the oil supply passage, . 3. The method of claim 2,
Wherein the compression unit has a discharge pressure chamber formed between the main frame and the first scroll, the discharge pressure chamber being a space surrounding the outer peripheral surface of the rotating shaft,
Wherein the rotary shaft includes an oil groove formed to be recessed at an outer circumferential surface facing the main frame and extended to communicate with the discharge pressure chamber. 6. The method of claim 5,
Wherein the oil supply passage has an inlet groove formed in the bottom surface of the discharge pressure chamber and positioned adjacent to the rotation axis. The method according to claim 1,
Wherein the second scroll includes a second scroll hard plate portion extending in the radial direction of the rotation shaft and having the back pressure-
And the back pressure-oil supply passage includes an intermediate pressure hole formed in the second scroll hard plate portion to communicate with the compression chamber. 8. The method of claim 7,
Wherein the intermediate pressure hole communicates with the inside of the compression chamber in which the pressure is changed within a range including a predetermined target pressure value of the intermediate pressure chamber during one revolution of the first scroll. The method according to claim 1,
The second scroll includes a side wall portion extending in the axial direction of the rotary shaft so as to be adjacent to the intermediate pressure chamber and through which the back pressure-
And the back pressure-oil supply passage includes an oil supply hole formed to communicate with the intermediate pressure chamber. 10. The method of claim 9,
And the oil supply hole is located on the bottom surface of the intermediate pressure chamber. The method according to claim 1,
Wherein the main frame includes a lubricant passage formed through the main frame to supply oil flowing out from the rotation shaft to the intermediate pressure chamber. 12. The method of claim 11,
The main frame includes:
A bearing surface formed to surround the rotation shaft and supporting the rotation shaft so as to be rotatable; And
And a sealing portion located at an end of the bearing surface and formed on an inner circumferential surface facing the rotation shaft. The method according to claim 2 or 11,
And a pressure reducing member formed to close a part of the oil supply passage is inserted into the oil supply passage. Casing;
A stator and a rotor accommodated in the casing to generate a rotating force; a driving unit having a rotating shaft connected to the rotor and rotated; And
And a compression unit that receives the rotational force of the rotary shaft and compresses the refrigerant,
The compression unit includes:
A first scroll connected to the rotation shaft and rotated;
A second scroll that engages a lower surface of the first scroll to form a compression chamber and overlaps the first scroll to receive a portion of the first scroll;
A main frame having an intermediate pressure chamber which is coupled to the second scroll by overlapping the first scroll on the upper side, the intermediate pressure chamber comprising a space adjacent to the first and second scrolls;
An oil supply hole formed to penetrate the first or second scroll and supplying oil to the intermediate pressure chamber from an outer peripheral surface of the rotary shaft; And
And a back pressure-oil supply passage formed through the second scroll so as to communicate the compression chamber and the intermediate pressure chamber with each other.

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