KR20080107235A - Scroll compressor - Google Patents

Abstract

A scroll compressor is provided to simplify machining thereof, and improve sealing effect in a simple structure. A sealing element(70) is seals a space of a peripheral part of a main bearing and a back pressure chamber formed at a rear surface part of a base plate of an orbiting scroll(20). A sealing element securing part is mounted on a top surface of a frame(30) to face an end surface of an orbiting boss part(23) of the orbiting scroll, into which a main shaft is inserted. A supporting element(80) disposes the sealing element to the sealing element securing part, and has a supporting part(80a) for supporting the sealing element and an elastic part making the sealing element contact the rear surface part of the orbiting base plate.

Description

Scroll Compressor {SCROLL COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for use in a refrigeration air conditioner, an air compressor, and the like.

As a conventional scroll compressor, there exists a thing disclosed by patent document 1 (Unexamined-Japanese-Patent No. 2004-270599). The scroll compression mechanism part and the electric motor are accommodated in the airtight container. The scroll compression mechanism part has a fixed scroll having a spiral wrap on a disc-shaped hard plate, and a swing scroll in which a spiral wrap is formed on a disc-shaped hard plate. The compression chamber is formed with the lap of the fixed scroll and the lap of the swinging scroll engaged.

The swing scroll includes a swing boss portion provided with a swing bearing portion that engages with an eccentric shaft portion of a main shaft that transmits rotational force to a surface (back surface) opposite to the hard plate surface on which the wrap is provided. The fixed scrolls are bolted to the frame with the main bearings, and the turning scrolls pivot within them.

The scroll compressor of patent document 1 has the back pressure chamber formed in the hard plate back part of a revolving scroll, and the sealing means which seals the discharge space of the main bearing side peripheral part. A concave groove is formed in the end face of the center portion of the frame opposite to the end face of the swing boss, and the seal is a combination of a sealing ring and a leaf spring for bringing the sealing ring into close contact with the back plate of the swing scroll. Means are provided.

The sealing ring is provided with a joint in order to absorb the influence of thermal expansion and tolerance of the sealing ring itself. When the compressor is in operation, the end face of the swing boss portion slides so that the sealing ring may be deformed by the frictional force. In addition, there is a possibility that the sealing ring is deformed by the pressure difference between the back pressure chamber and the discharge space of the peripheral portion of the main bearing side. For this reason, the sealing ring is prevented from deforming the sealing ring by being inserted into the groove in which the free area is set in the width of the sealing ring.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2004-270599

In the scroll compressor of the said patent document 1, processing of the groove which fits a sealing ring is important in order to ensure sealing function. Relatively large compressors are less likely to be subject to dimensional constraints. However, if the compact and inexpensive compressor is to be realized, there is a problem as an example.

In order to ensure the sealing property in the sealing means and the reliability of wear due to sliding movement, it is necessary to increase the processing accuracy of the groove, in particular, the surface roughness. However, when the above-mentioned structure is adopted in a compact compressor, the actual groove width is narrow and precision machining is difficult. In addition, there is a problem that workability is low, such as requiring a machining time or frequent blade tool change. In addition, the turning boss portion of the revolving scroll and the Oldham ring and the main shaft for preventing rotation should be arranged in a limited space in the frame, and also the thickness of the wall between the groove and the main bearing in which the sealing ring is inserted to ensure processing accuracy. Since it must be done, there is a problem of low design freedom.

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor that can solve the above problems, which is easy to machine, and can improve the sealing property with a simple configuration.

In order to achieve the above object, the present invention is characterized in that, in a sealed container, a fixed scroll and a rotating scroll provided with a spiral wrap on a hard plate, and a main bearing for journalically connecting a main shaft for rotating the rotating scroll. A scroll compressor having a frame, comprising: a back pressure chamber in the back plate portion of the swing scroll, sealing means for sealing a space between the back pressure chamber and a peripheral portion of the main bearing, and an end face of the swing boss portion of the swing scroll into which the main shaft is inserted. A sealing means mounting portion provided on an upper surface of the frame so as to face the sealing means, sealing supporting means for arranging the sealing means on the sealing means mounting portion, the sealing supporting means comprising a support portion for supporting the sealing means, and the sealing means. It is what has an elastic part for making contact with a turning hard board back part.

According to the present invention, the sealing property can be improved with a simple configuration, and machining can be facilitated, thereby minimizing the size reduction.

Hereinafter, embodiments of the present invention will be described. 1 is a cross-sectional view of a scroll compressor that is an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the sealed container 1, the scroll compression mechanism part 2 and the electric motor 3 which drives this scroll compression mechanism part 2 are accommodated. The scroll compression mechanism part 2 has the fixed scroll 10 and the revolving scroll 20. The fixed scroll 10 is the same as the tip of the wrap 11 around the bottom 12 and the spiral wrap 11 standing up from the bottom 12 as shown in FIGS. 1 and 6. It has the flange part 13 which is the plane of height. As shown in FIGS. 1 and 7, the orbiting scroll 20 is a spiral plate 21 having a disk shape and a spiral shape which is raised from the plate 21 and engaged with the wrap 11 of the fixed scroll 10. The boss | hub part 23 provided with the lap 22 and the turning scroll bearing which engages with the eccentric shaft part 5 which are continuously provided in the main shaft 4 is provided. The leading end of the main shaft 4 is inserted into this boss 23.

The frame 30 has a plane portion 31 provided around the space in which the swinging scroll 20 pivots and a main bearing 32 through which the main shaft 4 penetrates. The frame 30 and the fixed scroll 10 are in contact with the planar portion 31 of the frame 30 and the flange portion 13 of the fixed scroll 10, both of which are fastened with a plurality of bolts 24. The scroll compression mechanism part 2 has an Oldham ring 6 between the frame 30 and the revolving scroll 20 so that the revolving scroll 20 does not rotate and revolves about the fixed scroll 10.

The electric motor 3 is comprised from the stator 90 and the rotor 100 rotatably arrange | positioned at the inner peripheral side of this stator 90. The main shaft 4 is fixed to the rotor 100, and the rotor 100 rotates to transmit the driving force of the electric motor 3 to the turning scroll 20 via the main shaft 4.

An oil reservoir 120 partitioned by a bearing support plate 110 is installed at the bottom of the sealed container 1. The oil reservoir 120 stores lubricating oil for lubricating the rotating part. A bearing housing 111 is attached to the bearing support plate 110, and a spherical bearing 112 is disposed inside the bearing housing 111. The main shaft 4 is inserted into the cylindrical hole of the spherical bearing 112, and the main shaft 4 is rotatably supported. The oil reservoir 120 is provided with an oil supply pump 50 for supplying lubricant to the boss 23, the main bearing 32, and the like. The oil supply pump 50 is connected to the main shaft 4, and functions as a pump by rotating the main shaft 4 by the electric motor 3.

The main shaft 4 is provided with an oil supply passage 4a that penetrates the main shaft 4 substantially in the axial direction, and a horizontal oil supply hole 4b that communicates with the oil supply passage 4a. This horizontal oil supply hole 4b is opened to the outer circumferential surface of the main shaft 4 and communicates with the opening portion and the oil supply passage 4a. When driven by the electric motor 3 and the main shaft 4 rotates, the oil supply pump 50 operates to suck up the lubricating oil in the oil reservoir 120. Lubricating oil is discharged from the horizontal oil supply hole 4b past the oil supply passage 4a, and causes the main shaft 4 and the main bearing 32 to be lubricated. In addition, the lubricating oil rises the oil supply passage 4a and is discharged from the upper end of the main shaft 4 to lubricate the boss 23 having the swing scroll bearing.

The oil discharge pipe 60 bent in an L shape is attached to the frame 30. One end side of the oil discharge pipe 60 attached to the frame 30 introduces a lubricating oil that lubricates the boss portion 23, the main bearing 32, and the like, and the oil discharge pipe 60 receives the introduced lubricant oil. Guide downwards. The other end side of the oil discharge pipe 60 is open toward the stator 90, and guides the lubricating oil that lubricates the boss 23, the main bearing 32, and the like to the upper part of the stator 90. Since the stator 90 has a coil, it is preferable that at least the surface of the oil discharge pipe 60 or the side end of the stator 90 be made of an insulating material. In addition, since the oil discharge pipe 60 also attaches a refrigerant, it is preferable to use a material that can withstand the refrigerant.

The fixed scroll 10 is connected to the bottom portion 12 of the lap 11 by being connected to the discharge port 14 opened at the center of the spiral wrap 11 and the outside of the sealed container 1. It has a suction port 15 which opens, and a relief hole 114 which communicates the compression space 7 and the discharge side pressure space 113 in the airtight container 1. The relief holes 114 are formed in plural as shown in FIG. Moreover, the relief valve 115 which opens and closes the relief hole 114 is provided in the fixed scroll 10. The relief valve 115 is opened when the pressure in the compression space 7 becomes higher than the pressure in the discharge-side pressure space 113, thereby preventing overcompression of the refrigerant gas, and the fixed scroll 10 and the swinging scroll 20 are Reduces the separation force to fall.

The scroll compression mechanism part 2 sucks refrigerant gas from the suction port 15, and the refrigerant in the compression space 7 formed by the wraps 11 and 22, the bottom part 12, and the flange part 13 of both scrolls. Trap gas. The open / close valve 15a is a valve for opening and closing the inlet 15. Then, with the swinging motion of the swinging scroll 20, the compression space 7 moves to the center and gradually decreases in volume. As the volume of the compression space 7 decreases, the refrigerant gas confined in the compression space 7 is compressed, and the finally compressed refrigerant gas is discharged from the discharge port 14 in the discharge side pressure space 113 in the sealed container 1. To discharge.

The back pressure chamber 33 is formed with the frame 30 and the revolving scroll 20 on the back side of the revolving scroll 20 which is positioned opposite to the wrap 22 side with respect to the disk-shaped hard plate 21. When the refrigerant gas is compressed in the scroll compression mechanism part 2, a separation force is generated in which the fixed scroll 10 and the swinging scroll 20 are about to fall. This back pressure chamber 33 is provided in order to reduce the separation force.

A pressure between the discharge pressure discharged from the discharge port 14 and the suction pressure sucked from the suction port 15 is introduced into the back pressure chamber 33, and a pressing force for pressing the swing scroll 20 toward the fixed scroll 10 side is applied. It generates and reduces it against the separation force by the compressed gas in the compression space 7. Moreover, the back pressure control valve 140 which controls opening when the difference between the pressure in the back pressure chamber 33 and the pressure of a suction pressure exceeds a predetermined value so that the back pressure chamber 33 may communicate is provided in the fixed scroll 10. When the back pressure control valve 140 opens, the pressure in the back pressure chamber 33 is introduced into the suction pressure region.

Next, the pressure introduced into the back pressure chamber 33 will be described. The refrigerant gas discharged from the discharge port 14 into the discharge-side pressure space 113 contains high pressure lubricating oil. The refrigerant gas discharged to the discharge side pressure space 113 enters the electric motor 3 side through a groove (not shown) formed in the outer circumferential portion of the fixed scroll 10 and the frame 30. The refrigerant gas entering the motor 3 side passes through a groove (not shown) formed in the stator 90, a coil of the stator 90, a gap between the stator 90, and the rotor 100. In the process, the refrigerant gas collides with each part of the electric motor 3 to separate the lubricating oil contained therein. The separated lubricating oil falls down while losing the heat of each part, and enters the oil storage part 120 from the vent hole 110a formed in the bearing support plate 110. In addition, the refrigerant gas which has entered the electric motor 3 side comes out from the discharge pipe 130.

In addition, the refrigerant gas also flows into the oil storage unit 120 through the air vent 110a, but lubricating oil in the space in which the electric motor 3 is stored also flows into the oil storage unit 120 through the air vent 110a. .

As described above, the lubricating oil in which the refrigerant gas is dissolved passes through the oil supply passage 4a inside the main shaft 4 by the action of the pump of the oil supply pump 50, and from the horizontal oil supply hole 4b. I and lubricate the main shaft (4) and the main bearing (32). In addition, the lubricating oil rises the oil supply passage 4a and is discharged from the upper end of the main shaft 4 to lubricate the boss 23 having the swing scroll bearing. The lubricating oil which lubricates the turning scroll bearing in the boss part 23 flows to the upper surface 30a of the frame 30 from between the outer circumference of the main shaft 4 and the turning scroll bearing of the boss part 23 inner circumference, and thus the boss part 23. Lubricating the lower end of the) and the upper surface (30a) of the frame (30). Moreover, this lubricating oil moves to the outer peripheral side of the upper surface 30a, and flows into the back pressure chamber 33. Since the outer periphery of the main shaft 4 and the inner periphery of the boss | hub part 23 become narrow, the pressure of the lubricating oil which flowed into the back pressure chamber 33 by the pressure loss falls. In addition, the pressure of the refrigerant gas separated from the lubricating oil flowing into the back pressure chamber 33 becomes a pressure lower than the discharge pressure.

Next, the structure which seals the space of the upper peripheral part of the main bearing 32 provided in the frame 30, and the back pressure chamber 33 is demonstrated using FIGS.

FIG. 3 is an external perspective view of the seal ring 70 and the seal support means 80, FIG. 4 is a plan view of the seal support means 80, and FIG. 5 is a seal support means 80 inserted into the groove 34. FIG. It is a perspective view which shows a state.

In the upper peripheral part of the main bearing 32 provided in the frame 30, the sealing means mounting part which is a groove-shaped space concave from the surface of the frame 30 is formed. In this embodiment, the groove | channel 34 provided by boring the frame 30 is a sealing means mounting part. The groove 34 is provided with a sealing ring 70 for sealing the space around the upper peripheral portion of the main bearing 32 provided in the frame 30 and the back pressure chamber 33. As shown in Fig. 3, the sealing ring 70 is a joining portion 70a having a joining portion formed in a stepped shape, and is in close contact with an end portion of the boss portion 23 along the rotational axis direction of the main shaft 4, thereby causing a coaxial rotation shaft. A gap does not arise along a direction, and the outer peripheral part of the sealing ring 70 is in close contact with the outer peripheral wall of the groove | channel 34, and it does not produce a clearance also in the radial direction of a co-rotation shaft.

The sealing ring 70 (sealing means) is supported by the sealing support means 80. As shown in Fig. 2, the sealing support means 80 includes an L-shaped support portion 80a having a cross-sectional shape, and an elastic portion bent downward from the support portion 80a (side inserted into the groove 34). 80b. As shown in Figs. 3 and 4, the support portion 80a has a flat portion 81 and a rising portion 82 standing up from the flat portion 81, and the cross-sectional shape is L-shaped. have. The elastic portion 80b is cut out from the flat portion 81 and is bent downward from the standing up portion 82 (side inserted into the groove 34).

The lower side of the sealing ring 70 is mounted on the flat portion 81 of the support portion 80a, and the inner circumferential side is supported by the rising portion 82 of the support portion 80a. The upper side of the sealing ring 70 is in contact with the boss portion 23 (end) of the swing scroll 20 to seal the space of the upper peripheral portion of the main bearing 32 and the back pressure chamber 33. For this reason, the standing rise part 82 of the support part 80a takes the dimension structure lower than the height dimension of the sealing ring 70. As shown in FIG. That is, as shown in FIG. 2, it is assumed that "the height of the support portion 80a (the height of the standing rise portion) h <the height H of the sealing ring 70". Moreover, also in the radial direction, the flat part 81 of the support part 80a takes the dimension structure narrower than the width dimension of the sealing ring 70. As shown in FIG. That is, it is set as "width of the support part 80a (width of the flat part 81) (w) <sealing ring 70 width W". In addition, the sealing support means 80 is such that the upper end portion of the support portion 80a does not protrude from the upper surface 30a of the frame 30 as shown in FIGS. 2 and 5 in the state of being inserted into the groove 34. have. By doing in this way, since the sealing support means 80 does not directly contact the frame 30 or the revolving scroll 20, abrasion can be prevented.

The elastic portion 80b for bringing the sealing ring 70 into close contact with the boss portion 23 on the pivot plate back side is cut out from the flat portion 80c as described above, and inserted downward into the groove 34. It is bent toward]. Since the elastic part 80b is inserted in the groove 34, the shape of the elastic part 80b is matched with the shape of the groove 34. As shown in FIG. That is, the length in the radial direction of the elastic portion 80b is formed in consideration of the length in the radial direction of the groove 34, and the angle to bend is the depth of the groove 34 and the sealing ring 70 and the boss portion. The contact state with (23) may be considered. In this embodiment, the sealing support means 80 is formed in conformity with the shape of the groove 34, whereby the positional shift of the sealing ring 70 is less likely to occur.

Since the sealing ring 70 is supported by the sealing support means 80, the sealing ring 70 is in a floating state from the bottom of the groove 34. As shown in FIG. Conventionally, since the sealing ring was inserted directly in the groove, the sealing accuracy was ensured and the processing precision of the groove was required. In particular, in a compact compressor, since the groove is small, it is difficult to increase the processing accuracy of the groove. In this embodiment, since it is not necessary to increase the machining accuracy of the groove, machining can be facilitated, and it is possible to cope with the compactness of the compressor. Since the sealing support means 80 can be manufactured by sheet metal processing, a part can be manufactured at an inexpensive cost compared with machining the groove | channel 34.

In addition, although the elastic part 80b is provided with the flat leg, as shown in FIG. 4, you may provide the circular-arc part 84 which made the edge part circular arc shape, as shown in FIG. In addition, in this embodiment, although five elastic parts 80b were used, the number of elastic parts 80b is not limited to five, What is necessary is just to set suitably. The elastic force can be adjusted by the number of elastic portions 80b.

In addition, in this embodiment, although the support part 80a is provided over the whole circumference, it does not matter as much as the entire circumference. As long as it has the effect | action which can support the sealing ring 70, the structure divided | segmented into several over the circumferential direction may be sufficient. In addition, the joint of the sealing ring 70 may be angled with respect to the radial direction or the axial direction to make it difficult to deform, and the deformation of the sealing ring may be prevented.

As described above, according to this embodiment, the machining can be facilitated and the sealing property can be improved with a simple configuration.

1 is a cross-sectional view of a scroll compressor which is one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG. 1; FIG.

3 is an external perspective view of the seal ring 70 and the seal support means 80;

4 is a plan view of the seal support means 80;

5 is a perspective view showing a state in which the sealing support means 80 is inserted into the groove 34.

6 is a plan view of the fixed scroll 10.

7 is a plan view of the turning scroll 20.

<Explanation of symbols for the main parts of the drawings>

1: sealed container

2: scroll compression mechanism

3: electric motor

4: main shaft

5: eccentric shaft

6: Oldham Ring

7: compression space

10: fixed scroll

11, 22: wrap

12: bottom part

13 flange part

14 discharge port

15: inlet

20: turning scroll

21: disk-shaped hard plate

23: boss

30: frame

31: flat part

32: main bearing

33: back pressure chamber

34: home

50: oil supply pump

60: oil drain pipe

70: sealing ring

80: sealing support means

80a: support part

80b: elastic part

90: stator

100: rotor

Claims (5)

A scroll compressor having a frame having a fixed scroll and a swing scroll provided with a spiral wrap on a hard plate, and a main bearing for journalically connecting a main axis for pivoting the swing scroll in a sealed container, On the upper surface of the frame to face the back pressure chamber in the back plate portion of the swing scroll, sealing means for sealing the space between the back pressure chamber and the peripheral portion of the main bearing, and the end face of the swing boss portion of the swing scroll into which the main shaft is inserted. A sealing means mounting portion provided and a sealing support means for arranging the sealing means in the sealing means mounting portion, And the sealing supporting means has a supporting portion for supporting the sealing means, and an elastic portion for contacting the sealing means with the pivoting back plate back portion. The scroll compressor according to claim 1, wherein the height of the support is lower than that of the sealing means. The scroll compressor according to claim 1, wherein the width of the support portion is made narrower than the width of the sealing means. The scroll compressor according to claim 1, wherein the seal means mounting portion is a groove-shaped space for mounting the seal member. The scroll compressor according to claim 1, wherein the joining portion of the sealing ring is in contact with the rotation axis of the main shaft.

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