KR102083965B1 - Compressor - Google Patents

Abstract

The present invention relates to a compressor, specifically, a case in which a refrigerant discharge pipe for discharging compressed refrigerant is provided on the upper portion; A driving motor provided in the case; A rotation shaft coupled to the driving motor and formed to rotate; A compression unit having a water-reducing portion protruding downward so that at least a portion of the rotation shaft penetrates, and formed to compress the refrigerant; An oil feeder coupled to the rotating shaft and extending in the longitudinal direction of the rotating shaft toward the storage space; And a discharge cover coupled to the lower end of the compression unit, through which an oil feeder penetrates and a refrigerant cover compressed by the compression unit is directed toward the refrigerant discharge pipe. The coupling portion of the cover relates to a compressor characterized in that the sealing member is provided.

Description

Compressor {COMPRESSOR}

The present invention relates to a compressor, and more particularly, to a compressor that can prevent the compressed refrigerant from leaking in the process of being guided to the refrigerant discharge pipe.

In general, a compressor is applied to a refrigerant compression type refrigeration cycle (hereinafter abbreviated as a refrigeration cycle) such as a refrigerator or an air conditioner.

The compressor may be divided into a reciprocating compressor and a rotary compressor according to a method of compressing a refrigerant, and the rotary compressor may include a scroll compressor.

The scroll compressor may be divided into an upper compression type or a lower compression type according to the position of the driving motor and the compression unit. The upper compression type is a method in which the compression portion is located above the drive motor, and the lower compression type is a method in which the compression part is located below the drive motor.

Here, in the case of the lower compression type scroll compressor, a relatively uniform oil supply is possible because the distance between the low oil space and the compression part is short.

On the other hand, if a portion of the refrigerant compressed in the compressor leaks before reaching the refrigerant discharge pipe, the efficiency of the compressor may be lowered.

For example, a portion of the refrigerant compressed in the compression unit may leak between the discharge cover coupled to the lower end of the compression unit and the lower end of the compression unit.

Particularly, in the conventional lower compression type scroll compressor, since the discharge cover is coupled to the lower end of the compression unit, if a fine gap exists in the lower end of the compression unit and the coupling portion of the discharge cover, a part of the refrigerant may leak through the gap.

That is, the conventional compressor has a problem in that the overall efficiency of the compressor is reduced due to leakage of the refrigerant.

An object of the present invention is to solve the above-mentioned problem, and to provide a compressor capable of preventing leakage of compressed refrigerant.

In addition, an object of the present invention is to provide a compressor capable of preventing a reduction in efficiency of the compressor through prevention of leakage of the refrigerant.

The present invention is to achieve the above object, the case is provided with a refrigerant discharge pipe for discharging the compressed refrigerant on the top; A driving motor provided in the case; A rotation shaft coupled to the driving motor and formed to rotate; A compression unit having a water-reducing portion protruding downward so that at least a portion of the rotation shaft penetrates, and formed to compress the refrigerant; An oil feeder coupled to the rotating shaft and extending in the longitudinal direction of the rotating shaft toward the storage space; And a discharge cover which is coupled to the lower end of the compression unit, through which the oil feeder penetrates, and which discharges the refrigerant compressed by the compression unit toward the refrigerant discharge pipe.

At this time, a sealing member may be provided at the coupling portion of the compression portion and the discharge cover. By the sealing member, leakage of refrigerant through the coupling portion of the compression portion and the discharge cover can be prevented.

The discharge cover may have an inner side wall coupled to the water-reducing portion. In addition, the sealing member may include a first sealing member disposed between the inner side wall and the shaft portion.

By the first sealing member, leakage of refrigerant through the inner side wall of the discharge cover and the water-reducing portion can be prevented.

A fastening groove through which the upper end of the inner side wall can be fastened may be formed at a radially inner circumference or an outer circumference of the water-reducing section at a lower surface of the compression unit. As the upper end portion of the inner side wall is fastened to the fastening groove, leakage of the refrigerant can be more reliably prevented.

At least a portion of the shaft portion and the inner sidewall may be arranged to overlap each other in the radial direction. At this time, the first sealing groove and the second sealing groove formed at positions corresponding to each other for the arrangement of the first sealing member may be provided on the shaft portion and the inner side wall.

The discharge cover may further include an outer sidewall defining a radially outer circumference, and the outer sidewall may be coupled to a stepped portion provided on the radially outer side of the lower end of the compression unit. In addition, the sealing member may include a second sealing member disposed between the outer sidewall and the step portion.

The second sealing member may prevent leakage of refrigerant through the outer side wall of the discharge cover and the stepped portion of the compression unit.

The outer sidewall may include a vertical portion corresponding to a side surface of the step portion and a horizontal portion corresponding to an upper surface of the step portion and extending in a horizontal direction from an upper end of the vertical portion.

At this time, the second sealing member may be disposed between the upper surface of the step portion and the horizontal portion. Specifically, a third sealing groove and a fourth sealing groove formed at positions corresponding to each other may be provided on the upper surface of the stepped portion and the horizontal portion to arrange the second sealing member.

Alternatively, the second sealing member may be disposed between the side surface of the step portion and the vertical portion. Specifically, a fifth sealing groove and a sixth sealing groove formed at positions corresponding to each other may be provided on the side surface of the stepped portion and the vertical portion to arrange the second sealing member.

The upper surface of the stepped portion and the horizontal portion may be arranged to overlap at least a portion in the height direction of the compressed portion. In addition, the side surface of the step portion and the vertical portion may be arranged to overlap at least a portion in the radial direction of the discharge cover. Therefore, the contact area between the compression part and the discharge cover is increased, and leakage of the refrigerant can be more surely prevented.

The first sealing member and the second sealing member may be formed of O-rings or gaskets.

The compressor according to the present invention can be formed as a scroll compressor. That is, the above-described compression unit, the main frame provided below the drive motor; A fixed scroll provided below the main frame; And a pivoting scroll provided between the main frame and the stationary scroll and engaged with the stationary scroll to pivot to form the stationary scroll and the compression chamber.

At this time, the first discharge hole may be formed to penetrate the fixed scroll, and the second discharge hole may be formed to penetrate the fixed scroll and the main frame.

According to the present invention, it is possible to provide a compressor capable of preventing leakage of compressed refrigerant.

Further, according to the present invention, it is possible to improve the efficiency of the compressor by preventing leakage of the refrigerant.

1 is a cross-sectional view showing a compressor according to the present invention.
2 is a conceptual diagram showing a coupling relationship between a compression unit according to a first embodiment and a discharge cover coupled to a lower end of the compression unit.
3 is a conceptual view showing a coupling relationship between a compression unit according to a second embodiment and a discharge cover coupled to a lower end of the compression unit.
4 is a conceptual diagram showing a coupling relationship between a compression unit according to a third embodiment and a discharge cover coupled to a lower end of the compression unit.
5 is a conceptual diagram showing a coupling relationship between a compression unit according to a fourth embodiment and a discharge cover coupled to a lower end of the compression unit.
6 is a conceptual view showing a coupling relationship between a compression unit and a discharge cover coupled to a lower end of the compression unit according to the fifth embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, the overall structure of the compressor according to the present invention will be described with reference to FIG. 1.

1 is a cross-sectional view showing a compressor according to the present invention. Unless stated otherwise, the compressor according to the invention may represent a scroll compressor.

The compressor according to the present invention may include a case 110, a driving motor 120, a compression unit 100 and a rotating shaft 126.

The case 110 may be formed to have an interior space. For example, a low oil space in which oil is stored may be provided under the case 110. The storage space may refer to a fourth space V4 to be described later. That is, a fourth space V4 to be described later may be formed as the storage space.

In addition, a refrigerant discharge pipe 116 for discharging the compressed refrigerant may be provided on the upper portion.

Specifically, the interior space of the case 110 is a first space (V1) disposed on the upper side of the drive motor 110, a second space (V2) disposed between the drive motor 120 and the compression unit 100 ), A third space V3 divided by the discharge cover 170 to be described later, and a fourth space V4 disposed under the compression unit 100.

The case 110 may be formed in a cylindrical shape. For example, the case 110 may include a cylindrical shell 111 with an open top and bottom.

An upper shell 112 may be installed at an upper portion of the cylindrical shell 111, and a lower shell 114 may be installed at a lower portion of the cylindrical shell 111. The upper and lower shells 112 and 114 may be coupled to the cylindrical shell 111 by welding, for example, to form an interior space.

A refrigerant discharge pipe 116 may be installed in the upper shell 112. The refrigerant compressed in the compression unit 100 may be discharged to the outside through the refrigerant discharge pipe 116. For example, the refrigerant compressed in the compression unit 100 passes through the third space V3, the second space V2, and the third space V3 sequentially, and then through the refrigerant discharge pipe 116. It can be discharged to the outside.

Although not shown, an oil separator for separating the oil mixed with the refrigerant discharged to the outside may be connected to the refrigerant discharge pipe 116 or may be disposed on one side of the refrigerant discharge pipe 116.

The lower shell 114 may partition the fourth space V4, which is a low oil space for storing oil. The fourth space V4 may function as an oil chamber that supplies oil to the compression unit 100 so that the compressor can operate smoothly.

In addition, a refrigerant suction pipe 118 that is a passage through which a refrigerant to be compressed flows may be installed on the side surface of the cylindrical shell 111. The refrigerant suction pipe 118 may be installed through the compression chamber S1 along the side surface of the fixed scroll 150 to be described later.

The driving motor 120 may be installed inside the case 110. For example, the driving motor 120 may be disposed above the compression unit 100 inside the case 110.

The drive motor 120 may include a stator 122 and a rotor 124. The stator 122 may be cylindrical, for example, and may be fixed to the case 110. The coil 122a may be wound on the stator 122. Also, between the outer circumferential surface of the rotor 124 and the inner circumferential surface of the stator 122, a refrigerant flow path 112a may be formed to allow refrigerant or oil discharged from the compression unit 100 to pass therethrough. That is, the refrigerant passage groove 112a may be divided by an inner circumferential surface of the stator 122 and an outer circumferential surface of the rotor 124.

The rotor 124 is disposed inside the stator 122 in the radial direction, and may generate rotational power. That is, the rotor 124 may be rotated with the rotating shaft 126 by pressing the rotating shaft 126 at its center. The rotational power generated by the rotor 124 may be transmitted to the compression unit 100 through the rotation shaft 126.

The compression unit 100 may be coupled to the driving motor 120 to compress the refrigerant. The compression unit 100 may be formed to penetrate the rotation shaft 126 connected to the driving motor 120.

The compression unit 100 may include a water-reduction unit protruding upward and downward, and the rotation shaft 126 may penetrate at least a portion of the water-reduction unit. For example, the water-reducing portion may include a first water-repelling portion protruding upward from the compression portion 100 and a second water-repelling portion protruding downward, and a detailed description thereof will be described later.

The compression unit 110 may include a main frame 130, a fixed scroll 150, and an orbiting scroll 140.

Specifically, the compression unit 100 may further include an Oldham's ring 135. The old wall ring 135 may be installed between the orbiting scroll 140 and the main frame 130. In addition, the Oldham ring 135 prevents rotation of the orbiting scroll 140 and enables the orbiting movement of the orbiting scroll 140 on the fixed scroll 150.

The main frame 130 is provided below the driving motor 120 and may form an upper portion of the compression unit 100.

In the main frame 130, a frame plate having a substantially circular shape (hereinafter referred to as a 'first plate portion') 132 is provided at the center of the first plate portion 132, and the number of frame axes through which the rotating shaft 126 passes. A part (hereinafter, referred to as a 'first shaft part') 132a, and a frame side wall part protruding downward from an outer peripheral part of the first hard plate part 132 (hereinafter, referred to as a 'first side wall part') 131 May be provided.

The first sidewall portion 131 may have an outer circumferential portion in contact with an inner circumferential surface of the cylindrical shell 111, and a lower portion in contact with an upper portion of the fixed scroll sidewall portion 155 to be described later.

The first sidewall portion 131 may be provided with a frame discharge hole 131a penetrating the inside of the first sidewall portion 131 in the axial direction to form a refrigerant passage. In the frame discharge hole 131a, the entrance may communicate with the outlet of the fixed scroll discharge hole 155a, which will be described later, and the outlet may communicate with the second space V2. The frame discharge holes 131a and the fixed scroll discharge holes 155a communicating with each other may be represented by second discharge holes 131a and 155a.

A plurality of frame discharge holes 131a may be provided along the circumference of the main frame 130. In addition, a plurality of fixed scroll discharge holes 155a may also be provided along the circumference of the fixed scroll 150 to correspond to the frame discharge hole 131a.

The first shaft part 132a may be formed to protrude from the upper surface of the first plate part 132 toward the drive motor 120. In addition, the first bearing unit 132a may be formed with a first bearing unit so that the main bearing unit 126c of the rotating shaft 126, which will be described later, is supported.

That is, in the center of the main frame 130, the first bearing part 132a of which the main bearing part 126c of the rotating shaft 126 forming the first bearing part is rotatably inserted and supported may be formed through the axial direction. .

An oil pocket 132b for collecting oil discharged between the first shaft part 132a and the rotating shaft 126 may be formed on an upper surface of the first plate part 132.

The oil pocket 132b is concavely formed on the upper surface of the first hard plate part 132 and may be formed in an annular shape along the circumference of the first water bearing part 132a. In addition, a back pressure chamber S2 may be formed on the bottom surface of the main frame 130 to form a space together with the fixed scroll 150 and the orbiting scroll 140 to support the orbiting scroll 140 by the pressure of the space. have.

For reference, the back pressure chamber S2 may include an intermediate pressure region (ie, an intermediate pressure chamber), and the oil supply flow passage 126a provided in the rotating shaft 126 may have a high pressure region having a higher pressure than the back pressure chamber S2. It can contain.

A back pressure seal 180 may be provided between the main frame 130 and the orbiting scroll 140 to distinguish the high pressure region from the middle pressure region, and the back pressure seal 180 may be, for example, a sealing member. Can play a role.

In addition, the main frame 130 may be combined with the fixed scroll 150 to form a space in which the orbiting scroll 140 can be installed to be orbitable.

The fixed scroll 150 may be provided under the main frame 130. That is, the fixed scroll 150 forming the first scroll may be coupled to the bottom surface of the main frame 130.

The fixed scroll 150 is a fixed scroll side plate portion (hereinafter, referred to as a 'second plate portion') having a substantially circular shape, and a fixed scroll side wall portion protruding upward from an outer peripheral portion of the second plate portion 154 , 'Second side wall portion') (155), protruding from the upper surface of the second plate portion 154 and fixed to form a compression chamber (S1) by engaging with the orbiting wrap (141) of the orbiting scroll (140) to be described later A wrap 151 and a fixed scroll axis number part (hereinafter referred to as a 'second axis number part') 152 formed in the center of the rear surface of the second hard plate part 154 and through the rotation shaft 126 may be provided. .

The compression unit 100 is spaced apart from the first discharge hole 153 and the first discharge hole 153 for discharging the compressed refrigerant to the discharge cover 170 in the radial direction outside of the compression unit 100 and compressing the compressed refrigerant. The above-described second discharge holes 131a and 155a for guiding the cooled refrigerant toward the refrigerant discharge pipe 116 may be provided.

Specifically, a first discharge hole 153 for guiding the compressed refrigerant from the compression chamber S1 to the inner space of the discharge cover 170 may be formed in the second plate part 154. In addition, the position of the first discharge hole 153 may be arbitrarily set in consideration of required discharge pressure and the like.

As the first discharge hole 153 is formed toward the lower shell 114, the discharge cover for guiding the refrigerant discharged from the compression unit to the fixed scroll discharge hole 155a to be described later on the bottom surface of the fixed scroll 150 170) may be combined.

The discharge cover 170 may be hermetically coupled to the lower end of the compression unit 100. The discharge cover 170 may be formed to guide the refrigerant compressed in the compression unit 100 toward the refrigerant discharge pipe 116.

For example, the discharge cover 170 may be hermetically coupled to the bottom surface of the fixed scroll 150 to separate the discharge passage of the refrigerant and the fourth space V4.

In addition, the discharge cover 170, coupled to the sub-bearing portion (126g) of the rotating shaft 126 constituting the second bearing portion at least partially submerged in the oil accommodated in the fourth space (V4) of the case 110 oil feeder (171) ) May be formed through hole 176 to penetrate.

Meanwhile, the second sidewall portion 155 may be provided with a fixed scroll discharge hole 155a penetrating the inside of the second sidewall portion 155 in the axial direction and forming a refrigerant passage together with the frame discharge hole 131a. .

The fixed scroll discharge hole 155a is formed to correspond to the frame discharge hole 131a, the inlet communicates with the inner space of the discharge cover 170, and the outlet can communicate with the inlet of the frame discharge hole 131a.

The fixed scroll discharge hole (155a) and the frame discharge hole (131a), the third space (V3) so that the refrigerant discharged from the compression chamber (S1) to the inner space of the discharge cover 170 is guided to the second space (V2) ) And the second space V2 can be communicated.

In addition, the second side wall portion 155 may be installed such that the refrigerant suction pipe 118 communicates with the suction side of the compression chamber S1. Also, the refrigerant suction pipe 118 may be installed to be spaced apart from the fixed scroll discharge hole 155a.

The second shaft part 152 may be formed to protrude toward the fourth space V4 from the lower surface of the second plate part 154. In addition, the second bearing part 152 may be provided with a second bearing part so that the sub bearing part 126g of the rotating shaft 126 is inserted and supported.

In addition, the second shaft part 152 may be bent toward the center of the shaft so that the lower end supports the lower end of the sub bearing portion 126g of the rotating shaft 126 to form a thrust bearing surface.

The orbiting scroll 140 may be disposed between the main frame 130 and the fixed scroll 150 and may form a second scroll.

Specifically, the orbiting scroll 140 may be coupled to the rotating shaft 126 to form two pairs of compression chambers S1 between the fixed scroll 150 and the orbiting movement.

The orbiting scroll 140 protrudes from the bottom surface of the orbiting scroll plate part (hereinafter referred to as a 'third plate part') having a substantially circular shape, and the third plate part 145 to engage the fixed wrap 151 It may include a rotating shaft coupling portion 142 is provided in the center of the pivoting wrap 141 and the third plate portion 145 and rotatably coupled to the eccentric portion 126f of the rotating shaft 126.

The outer peripheral portion of the third hard plate portion 145 is located at the upper end portion of the second side wall portion 155, and the lower end portion of the orbiting wrap 141 is in close contact with the upper surface of the second hard plate portion 154, and is fixed to the fixed scroll 150. Can be supported.

For reference, a pocket groove 185 for guiding oil discharged through oil holes 128a, 128b, 128d, and 128e, which will be described later, to the intermediate pressure chamber may be formed on the upper surface of the orbiting scroll 140.

Specifically, the pocket groove 185 may be concavely formed on the upper surface of the third hard plate part 145. That is, the pocket groove 185 may be formed on the upper surface of the third plate 145 between the back pressure seal 180 and the rotating shaft 126.

Also, as shown in the drawing, one or more pocket grooves 185 may be formed at both sides of the rotating shaft 126. The pocket groove 185 may be formed in an annular shape around the rotation shaft 126 on the upper surface of the third plate 145 between the back pressure seal 180 and the rotation shaft 126.

The outer circumferential portion of the rotating shaft coupling portion 142 is connected to the orbiting wrap 141 and serves to form the compression chamber S1 together with the fixing wrap 151 in the compression process.

The fixing wrap 151 and the turning wrap 141 may be formed in an involute shape. The involute shape may mean a curve corresponding to the trajectory drawn by the end of the thread when unwinding the thread wound around the base circle having an arbitrary radius.

In addition, the eccentric portion 126f of the rotating shaft 126 may be inserted into the rotating shaft coupling portion 142. The eccentric portion 126f inserted into the rotating shaft coupling portion 142 may overlap the orbiting wrap 141 or the fixed wrap 151 in the radial direction of the compressor.

Here, the radial direction may mean a direction orthogonal to the axial direction (ie, the up-down direction) (ie, the left-right direction).

As described above, when the eccentric portion 126f of the rotating shaft 126 penetrates through the third plate portion 145 and overlaps the turning wrap 141 in the radial direction, the repulsive force and compression force of the refrigerant are the third plate portion 145 ) May be partially offset from each other while being applied to the same plane.

In addition, the rotating shaft 126 is coupled to the driving motor 120, and may include an oil supply flow path 126a for guiding oil contained in the fourth space V4, which is a low oil space of the case 110, to the top.

Specifically, the rotating shaft 126 is coupled to the upper portion of the rotor 124 is pressed into the center, the lower portion is coupled to the compression unit 100 may be supported in the radial direction.

The rotating shaft 126 may transmit the rotational force of the driving motor 120 to the orbiting scroll 140 of the compression unit 100. Through this, the orbiting scroll 140 eccentrically coupled to the rotating shaft 126 may orbit the fixed scroll 150.

The main bearing part 126c may be formed at a lower portion of the rotation shaft 126 to be inserted into the first shaft part 132a of the main frame 130 and supported in the radial direction. In addition, a sub-bearing portion 126g may be formed at a lower portion of the main bearing portion 126c to be inserted into the second shaft portion 152 of the fixed scroll 150 and supported in the radial direction. Then, between the main bearing portion 126c and the sub-bearing portion 126g, an eccentric portion 126f may be formed to be inserted into and coupled to the rotating shaft coupling portion 142 of the orbiting scroll 140.

The main bearing part 126c and the sub-bearing part 126g are formed on a coaxial line so as to have the same axial center, and the eccentric part 126f is radial to the main bearing part 126c or the sub-bearing part 126g. It can be formed eccentrically.

The eccentric portion 126f may have an outer diameter smaller than the outer diameter of the main bearing portion 126c and larger than the outer diameter of the sub-bearing portion 126g. In this case, it may be advantageous to combine the rotating shaft 126 through the respective shaft numbers 132a and 152 and the rotating shaft coupling portion 142.

And inside the rotating shaft 126, an oil supply flow path 126a for supplying oil in the fourth space V4, which is a low oil space, to the outer circumferential surfaces of each bearing part 126c and 126g and the outer circumferential surfaces of the eccentric part 126f is formed. Can be. In addition, oil holes 128a, 128b, 128d, 128e penetrating radially outwards of the rotating shaft 126 in the oil supply passage 126a are formed in the bearing portions and the eccentric portions 126c, 126g, 126f of the rotating shaft 126 Can be.

Specifically, the oil hole may include a first oil hole 128a, a second oil hole 128b, a third oil hole 128d, and a fourth oil hole 128e.

First, the first oil hole 128a may be formed to penetrate the outer peripheral surface of the main bearing part 126c. The first oil hole 128a may be formed to penetrate from the oil supply flow passage 126a to the outer peripheral surface of the main bearing part 126c.

In addition, the first oil hole 128a may be formed to penetrate the upper portion of the outer circumferential surface of the main bearing portion 126c, but is not limited thereto. When the first oil hole 128a includes a plurality of holes, each hole may be formed only on the upper or lower portion of the outer circumferential surface of the main bearing portion 126c, or on the upper and lower portions of the outer circumferential surface of the main bearing portion 126c. Each may be formed.

The second oil hole 128b may be formed between the main bearing portion 126c and the eccentric portion 126f. The second oil hole 128b may include a plurality of holes, unlike that shown in the drawing.

The third oil hole 128d may be formed to penetrate the outer peripheral surface of the eccentric portion 126f. Specifically, the third oil hole 128d may be formed to penetrate from the oil supply passage 126a to the outer circumferential surface of the eccentric portion 126f.

The fourth oil hole 128e may be formed between the eccentric portion 126f and the sub bearing portion 126g.

The oil guided upward through the oil supply passage 126a may be discharged through the first oil hole 128a to be supplied to the outer circumferential surface of the main bearing part 126c as a whole.

In addition, the oil guided upward through the oil supply passage 126a is discharged through the second oil hole 128b and supplied to the upper surface of the orbiting scroll 140, and discharged through the third oil hole 128d. It can be supplied as a whole to the outer peripheral surface of the eccentric portion (126f).

In addition, the oil guided upward through the oil supply passage 126a is discharged through the fourth oil hole 128e, between the outer circumferential surface of the sub-bearing portion 126g or the orbiting scroll 140 and the fixed scroll 150. Can be supplied.

An oil feeder 171 for pumping oil filled in the fourth space V4 may be coupled to a lower end of the rotary shaft 126, that is, a lower end of the sub-bearing part 126g. The oil feeder 171 may be formed to supply the oil accommodated in the fourth space V4 toward the aforementioned oil holes 128a, 128b, 128d, 128e.

The oil feeder 171 is inserted into the oil supply passage 126a of the rotating shaft 126 and coupled to the oil supply pipe 173 and the oil suction member 174 inserted into the oil supply pipe 173 to absorb oil. It can be done.

The oil supply pipe 173 may be installed to pass through the through hole 176 of the discharge cover 170 to be locked in the fourth space V4, and the oil suction member 174 may function as a propeller.

 The oil absorption member 174 may include a spiral groove 174a extending along the longitudinal direction of the oil absorption member 174. The spiral groove 174a may be formed around the oil absorbing member 174, and may extend toward the aforementioned oil holes 128a, 128b, 128d, and 128e.

When the oil feeder 171 is rotated together with the rotating shaft 126, oil accommodated in the fourth space V4 may be guided to the oil holes 128a, 128b, 128d, and 128e along the helical groove 174a.

A balance weight 127 for suppressing noise and vibration may be coupled to the rotor 124 or the rotation shaft 126. The balance weight 127 may be provided in the second space V2 between the driving motor 120 and the compression unit 100.

Next, looking at the operation process of the scroll compressor according to the embodiment of the present invention, as follows.

When power is applied to the drive motor 120 and rotational force is generated, the rotation shaft 126 coupled to the rotor 124 of the drive motor 120 rotates. Then, while the orbiting scroll 140 eccentrically coupled to the rotating shaft 126 rotates with respect to the fixed scroll 150, a compression chamber S1 is formed between the orbiting wrap 141 and the fixed wrap 151. The compression chamber (S1) may be formed in several steps in succession as the volume gradually narrows toward the center.

Then, the refrigerant supplied from the outside of the case 110 through the refrigerant suction pipe 118 may be directly introduced into the compression chamber S1. This refrigerant is compressed while moving in the direction of the discharge chamber of the compression chamber (S1) by the orbiting motion of the orbiting scroll (140), and then from the discharge chamber to the third space (V3) through the discharge port (153) of the fixed scroll (150). Can be discharged.

Thereafter, the compressed refrigerant discharged to the third space V3 is discharged into the inner space of the case 110 through the fixed scroll discharge hole 155a and the frame discharge hole 131a, and then the refrigerant discharge pipe 116 is discharged. Through a series of processes to be discharged to the outside of the case 110 is repeated.

During the operation of the compressor, the oil contained in the fourth space (V4) is guided upward through the rotating shaft 126 to smooth the bearing portion, that is, the bearing surface through the plurality of oil holes 128a, 128b, 128d, 128e. By being supplied, wear of the bearing portion can be prevented.

In addition, the oil discharged through the plurality of oil holes 128a, 128b, 128d, and 128e may form an oil film between the fixed scroll 150 and the orbiting scroll 140 to maintain an airtight state in the compressed portion.

Due to the oil, the refrigerant compressed in the compression unit 100 and discharged to the first discharge hole 153 may contain oil. Hereinafter, for convenience of description, a refrigerant in which oil is mixed may be referred to as an oil incorporating refrigerant.

The oil mixed refrigerant is guided to the first space (V1) via the second discharge holes (131a, 155a), the second space (V2), and the refrigerant passage groove (112a). And, among the oil-mixed refrigerant guided to the first space (V1), the refrigerant can be discharged to the outside of the compressor through the refrigerant discharge pipe 116, and the oil is provided to the fourth space (V4) through the oil recovery channel 112b. Can be recovered.

For example, the oil recovery passage 112b may be disposed on the outermost side in the radial direction within the case 110. Specifically, the oil recovery passage 112b includes a flow path between the outer circumferential surface of the stator 122 and the inner circumferential surface of the cylindrical shell 111, a flow path between the outer circumferential surface of the main frame 130 and the inner circumferential surface of the cylindrical shell 111, and a fixed scroll A flow path between the outer circumferential surface of 150 and the inner circumferential surface of the cylindrical shell 111 may be included.

On the other hand, since the discharge cover 170 is coupled to the bottom of the compression unit 100, a fine gap may exist between the bottom of the compression unit 100 and the top of the discharge cover 170. This fine gap can cause refrigerant leakage.

That is, when the refrigerant is discharged to the third space V3 through the first discharge hole 153 of the compression unit 100 and guided to the second discharge holes 131a and 155a, a part of the refrigerant is compressed portion 100 ) And the discharge cover 170 may leak.

In addition, such refrigerant leakage has a problem that can reduce the compression efficiency of the compressor. These problems are the sealing members 210 and 220 and the compression part 100 provided between the compression part 100 and the discharge cover 170 (that is, the coupling part of the compression part 100 and the discharge cover 170). It can be solved through the coupling structure of the discharge cover 170.

Hereinafter, various embodiments of a structure for preventing leakage of refrigerant that may be generated in a coupling portion of the compression unit 100 and the discharge cover 170 will be described with reference to other drawings. For convenience of description, the configuration of the oil feeder is not shown in the drawings.

2 is a conceptual diagram showing a coupling relationship between a compression unit according to a first embodiment and a discharge cover coupled to a lower end of the compression unit.

Referring to FIG. 2, as described above, the compression unit 100 may include a water-reducing portion protruding downward (ie, a second water-reducing portion 152) in a radial center portion. In addition, step portions 1502 and 1503 that are concavely formed may be provided on the radially outer side of the lower end of the compression unit 100.

Specifically, the second shaft part 152 and the stepped parts 1502 and 1503 may be provided on the fixed scroll 150 described above. That is, the second shaft portion 152 is formed to protrude downward from the radial center portion of the fixed scroll 150, and the stepped portions 1502 and 1503 are provided outside the radial direction from the bottom of the fixed scroll 150. You can.

Hereinafter, unless otherwise described, the lower or lower surface of the compression mechanism 100 may mean the lower or lower surface of the fixed scroll 150.

The discharge cover 170 may include an inner sidewall 1701 coupled to the second shaft portion 152 and outer sidewalls 1702 and 1703 coupled to the stepped portions 1502 and 1503. That is, the inner sidewall 1701 may be disposed inside the discharge cover 170 in the radial direction compared to the outer sidewalls 1702 and 1703. In addition, the outer side walls 1702 and 1703 may be formed to partition the outer circumference of the discharge cover 170.

At this time, a first sealing member 210 may be disposed between the inner sidewall 1701 and the second shaft portion 152. The first sealing member 210 may be formed of an O-ring. By the first sealing member 210, leakage of the refrigerant may be prevented.

The inner sidewall 1701 and the second shaft portion 152 may be disposed to overlap at least a portion in the radial direction. In the present embodiment, the inner sidewall 1701 may be disposed to make a surface contact with the outer circumferential surface of the second water-reducing portion 152 from the radially outer side of the second water-reducing portion 152.

More specifically, a fastening groove 1505 in which the upper end of the inner sidewall 1701 can be fastened may be formed on the lower surface of the compression part 100. The fastening groove 1505 may be disposed in the radially inner circumference or the outer circumference of the second shaft portion 152.

In this embodiment, the fastening groove 1505 may be formed concave on the lower surface of the compression unit 100 in the radially outer circumference of the second shaft portion 152.

As the upper end portion of the inner side wall 1701 is inserted into the fastening groove 1505, leakage of the refrigerant in the third space V3 can be more reliably prevented.

At least a portion of the second shaft portion 152 and the inner sidewall 1701 may be disposed to overlap each other in a radial direction. That is, the second shaft portion 152 and the inner sidewall 1701 may be disposed to face each other in a radial direction.

In addition, a first sealing groove 152a and a second sealing groove 1701a for arranging the first sealing member 210 may be provided on the second shaft part 152 and the inner sidewall 1701. .

That is, the first sealing groove 152a may be concave in the radially inner side in the second shaft portion 152. In addition, the second sealing groove 1701a may be concave radially outward on the inner sidewall 1701.

The first sealing groove 152a and the second sealing groove 1701a may be disposed at positions corresponding to each other. The first sealing member 210 may be disposed in a space partitioned by the first sealing groove 152a and the second sealing groove 1701a. Accordingly, leakage of the refrigerant through the inner sidewall 1701 and the second water-reducing unit 152 may be more reliably prevented by the first sealing member 210.

The outer side walls 1702 and 1703 of the discharge cover 170 may be coupled to the stepped portions 1502 and 1503 provided on the radially outer side of the lower end of the compression portion 100.

Specifically, the outer sidewalls 1702 and 1703 correspond to vertical portions 1702 corresponding to the side surfaces 1502 of the stepped portions 1502 and 1503 and upper surfaces 1503 of the stepped portions 1502 and 1503. A horizontal portion 1703 may be provided. The horizontal portion 1703 may extend in a horizontal direction from the top of the vertical portion 1702.

That is, the side surface 1502 of the stepped portions 1502 and 1503 is in contact with the vertical portion 1702 of the outer side walls 1702 and 1703, and the upper surfaces 1503 of the stepped portions 1502 and 1503 are the outer side walls. It is possible to contact the horizontal portion 1703 of (1702, 1703).

Therefore, by increasing the contact area at the lower end of the compression unit 100 and the coupling portion of the discharge cover 170, leakage of the refrigerant can be surely prevented.

Hereinafter, a coupling structure between the compression unit and the discharge cover according to the second embodiment will be described with reference to other drawings.

3 is a conceptual view showing a coupling relationship between a compression unit according to a second embodiment and a discharge cover coupled to a lower end of the compression unit. Hereinafter, the difference from the first embodiment will be mainly described, and a description of the same configuration as the first embodiment will be omitted.

Referring to FIG. 3, the inner sidewall 1701 may be disposed to make a surface contact with the inner circumferential surface of the second water-reduction unit 152 from the radially inner side of the second water-reduction unit 152.

A fastening groove 1505 in which the upper end of the inner sidewall 1701 can be fastened may be formed on the lower surface of the compression part 100. In this embodiment, the fastening groove 1505 may be formed concave at the lower end of the compression unit 100 in the radially inner circumference of the second shaft portion 152. For example, the fastening groove 1505 may be formed to be stepped upward from a radially inner circumference of the second shaft portion 152.

A first sealing groove 152a may be concave radially outward in the second shaft portion 152. In addition, a second sealing groove 1701a may be concave radially inward on the inner sidewall 1701.

The first sealing groove 152a and the second sealing groove 1701a may be disposed at positions corresponding to each other. The first sealing member 210 may be disposed in a space partitioned by the first sealing groove 152a and the second sealing groove 1701a. The first sealing member 210 may be formed of an O-ring. Therefore, leakage of the refrigerant can be more reliably prevented by the first sealing member 210.

Since the outer side walls 1702 and 1703 are the same as the first embodiment, detailed descriptions thereof will be omitted. Hereinafter, a coupling structure of the compression unit and the discharge cover according to the third embodiment will be described with reference to other drawings.

4 is a conceptual diagram showing a coupling relationship between a compression unit according to a third embodiment and a discharge cover coupled to a lower end of the compression unit. Hereinafter, the difference from the second embodiment will be mainly described, and a description of the same configuration as the second embodiment will be omitted.

According to this embodiment, the above-described first sealing member 210 may not be provided, but the coupling structure between the inner sidewall 1701 of the discharge cover 170 and the second water-reducing unit 152 is the same as the second embodiment. It can be the same.

In this embodiment, the second sealing member 220 may be disposed between the outer sidewalls 1702 and 1703 and the stepped portions 1502 and 1503. By the second sealing member 220, leakage of refrigerant through the outer side walls 1702 and 1703 and the stepped portions 1502 and 1503 may be prevented.

Specifically, the outer sidewalls 1702 and 1703 may include vertical portions 1702 corresponding to side surfaces 1502 of the stepped portions 1502 and 1503. In addition, the outer side walls 1702 and 1703 may further include a horizontal portion 1703 corresponding to the upper surfaces 1503 of the stepped portions 1502 and 1503 and extending in a horizontal direction from the upper end of the vertical portion 1702. You can.

In this case, the second sealing member 220 may be disposed between the upper surface 1503 of the stepped portions 1502 and 1503 and the horizontal portion 1703. In addition, the first sealing member 220 may be formed of an O-ring.

More specifically, a third sealing groove 1503a and a fourth sealing groove 1703a for disposing the second sealing member 220 on the upper surface 1503 and the horizontal portion 1703 of the stepped portions 1502 and 1503 ) May be provided.

That is, the third sealing groove 1503a may be concave upward on the upper surfaces 1503 of the step portions 1502 and 1503. In addition, the fourth sealing groove 1703a may be recessed downward in the horizontal portion 1703.

In addition, the third sealing groove 1503a and the fourth sealing groove 1703a may be arranged to correspond to each other, and the second sealing member by the third sealing groove 1503a and the fourth sealing groove 1703a. Space for the arrangement of 220 may be partitioned.

Therefore, leakage of the refrigerant through the outer sidewalls 1702 and 1703 and the stepped portions 1502 and 1503 may be more reliably prevented by the second sealing member 220.

In addition, the upper surface 1503 of the stepped portions 1502 and 1503 and the horizontal portion 1703 may be arranged to overlap at least a portion in the height direction of the compression portion 100.

At this time, the top surface 1503 of the stepped portions 1502 and 1503 and the horizontal portion 1703 may be in surface contact with each other. In addition, the side surface 1502 of the stepped portions 1502 and 1503 and the vertical portion 1702 may be disposed to be in surface contact with each other.

As the contact area is increased at the lower end of the compression part 100 and the coupling part of the discharge cover 170, leakage of the refrigerant can be surely prevented.

Hereinafter, a coupling structure of the compression unit and the discharge cover according to the fourth embodiment will be described with reference to other drawings.

5 is a conceptual diagram showing a coupling relationship between a compression unit according to a fourth embodiment and a discharge cover coupled to a lower end of the compression unit. Hereinafter, the difference from the third embodiment will be mainly described, and a description of the same configuration as the third embodiment will be omitted.

Also in this embodiment, the outer sidewalls 1702 and 1703 may include vertical portions 1702 corresponding to the side surfaces 1502 of the stepped portions 1502 and 1503 formed in the compression portion 100. In addition, the outer sidewalls 1702 and 1703 may further include a horizontal portion 1703 corresponding to the upper surfaces 1503 of the stepped portions 1502 and 1503 and extending in a horizontal direction from the top of the vertical portion 1702. You can.

Meanwhile, in the present embodiment, the second sealing member 220 may be disposed between the side surface 1502 and the vertical portion 1702 of the stepped portions 1502 and 1503. In addition, the second sealing member 220 may be formed of an O-ring.

Specifically, the fifth sealing groove 1502a and the fifth sealing groove 1502a formed at positions corresponding to each other for the placement of the second sealing member 220 on the side surface 1502 and the vertical portion 1702 of the stepped portions 1502 and 1503. 6 sealing grooves 1702a may be provided.

That is, the fifth sealing groove 1502a may be concave in the radially inner side on the side surface 1502 of the stepped portions 1502 and 1503. In addition, the sixth sealing groove 1702a may be concave in the radial direction outward in the vertical portion 1702.

In addition, the fifth sealing groove 1502a and the sixth sealing groove 1702a may be disposed to correspond to each other, and the second sealing member is formed by the fifth sealing groove 1502a and the sixth sealing groove 1702a. Space for the arrangement of 220 may be partitioned.

Therefore, leakage of the refrigerant through the outer sidewalls 1702 and 1703 and the stepped portions 1502 and 1503 may be more reliably prevented by the second sealing member 220.

In addition, the side surface 1502 of the stepped portions 1502 and 1503 and the vertical portion 1702 may be arranged to overlap at least a portion in the radial direction of the discharge cover 170.

At this time, the side surface 1502 and the vertical portion 1702 of the stepped portions 1502 and 1503 may be in surface contact with each other. In addition, the upper surface 1503 of the stepped portions 1502 and 1503 and the horizontal portion 1703 may be disposed to be in surface contact with each other.

As the contact area is increased at the lower end of the compression part 100 and the coupling part of the discharge cover 170, leakage of the refrigerant can be surely prevented.

Hereinafter, a coupling structure of the compression unit and the discharge cover according to the fourth embodiment will be described with reference to other drawings.

6 is a conceptual view showing a coupling relationship between a compression unit and a discharge cover coupled to a lower end of the compression unit according to the fifth embodiment. Hereinafter, the difference from the second embodiment will be mainly described, and a description of the same configuration as the second embodiment will be omitted.

In this embodiment, the coupling structure of the compression unit 100 and the discharge cover 170 may be the same as the second embodiment as a whole.

However, unlike the second embodiment, the present embodiment may include the first sealing member 210 and the second sealing member 220 together.

That is, the first sealing groove 152a may be concave in the radially outer side in the second water-reducing portion 152. In addition, a second sealing groove 1701a may be concave radially inward on the inner sidewall 1701.

The first sealing groove 152a and the second sealing groove 1701a may be disposed at positions corresponding to each other. The first sealing member 210 may be disposed in a space partitioned by the first sealing groove 152a and the second sealing groove 1701a. In addition, the first sealing member 210 may be formed of an O-ring (O-ring).

According to this embodiment, the second sealing member 220 may be further disposed between the outer sidewalls 1702 and 1703 and the stepped portions 1502 and 1503. The second sealing member 220 may be formed of a gasket.

By the second sealing member 220, leakage of refrigerant through the outer side walls 1702 and 1703 and the stepped portions 1502 and 1503 may be prevented.

Specifically, the outer sidewalls 1702 and 1703 may include vertical portions 1702 corresponding to side surfaces 1502 of the stepped portions 1502 and 1503. In addition, the outer sidewalls 1702 and 1703 may further include a horizontal portion 1703 corresponding to the upper surfaces 1503 of the stepped portions 1502 and 1503 and extending in a horizontal direction from the top of the vertical portion 1702. You can.

At this time, the second sealing member 220 formed of a gasket may be disposed between the upper surface 1503 of the stepped portions 1502 and 1503 and the horizontal portion 1703.

The above-described invention, the above-described embodiments and the accompanying drawings because it is possible for a person having ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It is not limited by.

100: compression unit 110: case
120: drive motor 126: rotating shaft
130: main frame 140: orbiting scroll
150: fixed scroll 210: first sealing member
220: second sealing member

Claims (15)

A case provided with a refrigerant discharge pipe for discharging the compressed refrigerant;
A driving motor provided in the case;
A rotation shaft coupled to the driving motor and formed to rotate;
A compression unit provided with a water-reducing portion protruding through at least a portion of the rotation shaft, and formed to compress the refrigerant;
An oil feeder coupled to the rotating shaft and extending in the longitudinal direction of the rotating shaft toward a storage space; And
It includes a; a discharge cover coupled to the compression unit, a through hole through which the oil feeder passes, and guiding the refrigerant compressed by the compression unit toward the refrigerant discharge pipe;
The discharge cover is coupled to the shaft portion,
The discharge cover includes an inner sidewall provided to make a surface contact with the inner circumferential surface of the water-reducing portion from the radially inside of the water-reducing portion,
It includes a first sealing member disposed between the inner side wall and the shaft portion,
A first sealing groove is formed concave radially outward in the shaft portion,
A second sealing groove formed concave in the radially inner side is formed on the inner sidewall,
The first sealing groove and the second sealing groove are arranged at positions corresponding to each other to divide the space,
A compressor in which the first sealing member is disposed in the space. According to claim 1,
The compression unit, a first discharge hole for discharging the compressed refrigerant to the discharge cover and a second discharge hole spaced from the first discharge hole radially outwardly of the compression unit and guiding the refrigerant toward the refrigerant discharge pipe Equipped,
The first discharge hole and the second discharge hole is a compressor, characterized in that formed to communicate with the space partitioned by the discharge cover and the lower end of the compression portion. delete According to claim 1,
Compressor characterized in that a fastening groove is formed in the radially inner circumference of the water-reducing portion on the lower surface of the compression portion to which the upper end of the inner side wall can be fastened. delete According to claim 1,
The discharge cover further includes an outer sidewall defining a radially outer circumference, and the outer sidewall is coupled to a stepped portion provided on the radially outer side of the lower end of the compression part,
And a second sealing member disposed between the outer sidewall and the stepped portion. The method of claim 6,
The outer side wall includes a vertical portion corresponding to a side surface of the step portion and a horizontal portion corresponding to an upper surface of the step portion and extending in a horizontal direction from an upper end of the vertical portion,
The second sealing member is a compressor, characterized in that disposed between the upper surface of the step portion and the horizontal portion. The method of claim 7,
A compressor having a third sealing groove and a fourth sealing groove formed at positions corresponding to each other for the placement of the second sealing member on the upper surface of the step portion and the horizontal portion. The method of claim 7,
Compressor, characterized in that the upper surface of the stepped portion and the horizontal portion are arranged to overlap at least a portion in the height direction of the compression portion. The method of claim 6,
The outer side wall includes a vertical portion corresponding to a side surface of the step portion and a horizontal portion corresponding to an upper surface of the step portion and extending in a horizontal direction from an upper end of the vertical portion,
The second sealing member is a compressor, characterized in that disposed between the side of the step portion and the vertical portion. The method of claim 10,
A compressor having a fifth sealing groove and a sixth sealing groove formed at positions corresponding to each other for the placement of the second sealing member on the side surface of the stepped portion and the vertical portion. The method of claim 10,
Compressor, characterized in that the side portion of the step portion and the vertical portion are arranged to overlap at least a portion in the radial direction of the discharge cover. According to claim 1,
The first sealing member is a compressor characterized in that it is formed of an O-ring. According to claim 1,
The first sealing member is a compressor characterized in that it is formed of a gasket. According to claim 2,
The compression unit,
A main frame provided below the drive motor;
A fixed scroll provided below the main frame; And
It is provided between the main frame and the fixed scroll, and includes a orbiting scroll that rotates in engagement with the fixed scroll to form the fixed scroll and the compression chamber,
The first discharge hole is formed to penetrate the fixed scroll, the second discharge hole is a compressor, characterized in that formed to penetrate the fixed scroll and the main frame.

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