JPH10159779A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a function for separating a coolant from oil by providing a shielding plate between the rotation space where a rotor rotates, and the opening of a support plate. SOLUTION: When an electric motor 8 starts to operate and a drive shaft 10 rotates, a coolant drawn from intake space 51 is compressed in a compression chamber 55 made of a revolving scroll member 40 and a fixed scroll member 50. Thereafter, the coolant is discharged from a delivery port 52 and, then, arrives at the turning space 25 of a balance weight 21 from delivery space 56 via coolant flow passages 57 and 26. Then, the coolant is agitated on the rotation of the balance weight 21 and collides with the inner surface of the surrounding wall 24 of a balance weight cover 22. A primary oil separation process is thereby implemented. Also, the coolant containing oil arrives at the rotation space 82 of the rotor 11, and is subjected to agitating and colliding actions on the rotation of the rotor 11, thereby implementing a secondary oil separation process. Furthermore, the coolant containing the oil moves up in the rotation space 82, and collides with a shielding plate 80. The coolant is thereby directed externally and at this time, a tertiary oil separation process is implemented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor having a discharge port at an upper portion of a sealed case, a motor arranged above the sealed case, and a compression defined by a revolving scroll member and a fixed scroll member below the motor. Room,
The present invention relates to a scroll-type compressor configured so that high-pressure refrigerant compressed in a compression chamber rises in a closed case and reaches the discharge port.

[0002]

2. Description of the Related Art As a conventional scroll compressor, for example, disclosed in Japanese Patent Application Laid-Open No. 8-189481, a sealed case 6 having a suction pipe 2 and a discharge pipe 7 as shown in FIG. A high-pressure space 39 formed above the case 6 and communicating with the discharge pipe 7;
The brushless motor 8 as an electric motor disposed in the high-pressure space 39, a drive shaft 10 fixed to a rotor 11 of the brushless motor 8, and a bearing 15 for rotatably supporting the upper end of the drive shaft 10 are held. Support plate 1
4, a block 16 that rotatably holds the lower end of the drive shaft 10, an eccentric shaft 19 that projects eccentrically downward from the lower end of the drive shaft 10, and is mounted on the eccentric shaft. The orbiting scroll member 40, which is prevented from rotating, orbits, and a fixed scroll member 50 which meshes with the orbiting scroll member 40 to form a compression chamber 55 and is fixed to the block 16.

Further, an oil reservoir 27 is formed on the upper surface of the block 16, and a balance weight cover 22 which is surrounded by a rotation space 25 of a balance weight 21 fixed to the drive shaft 10 is attached. The balance weight cover 22 separates the oil sump 27 from the rotation space 25 so that the oil in the oil sump 27
This is provided so as not to enter the rotating space. Also, this balance weight cover 22
Of the refrigerant passage 2 communicating with the compression chamber 55
6 are formed. The refrigerant passage 26 communicates with a refrigerant passage 57 provided continuously with the block 16 and the fixed scroll member 50.
Communicates with a discharge space 56, which is formed by a compression chamber 55 formed through the center of the fixed scroll member 50.
Are communicated with the discharge holes 52 of. In FIG. 2, parts that are not described above are denoted by the same reference numerals as in FIG. 1, and description thereof is omitted.

[0004] As a result, the refrigerant compressed in the compression chamber 55 reaches the discharge space 56 from the discharge hole 52, and flows through the refrigerant passage 5.
7, through the coolant passage 26, through the rotation space 25 of the balance weight cover 22, through the rotation space of the rotor 11, and open the opening 14a formed in the support plate 14.
And reaches the discharge pipe 7.

Accordingly, the oil sucked into the compression chamber 55 together with the refrigerant in the suction space 51 located near the suction pipe 2 and on the suction side of the compression chamber 55 follows the above-described path together with the refrigerant. Are separated from the refrigerant by colliding with the inner surface of the peripheral wall portion 24 of the balance weight cover 22, the inner peripheral surface of the stator 13, and the inner peripheral surface of the closed case 6 by the stirring of the balance weight 21 and the stirring of the rotor 11, respectively. And returns to the oil reservoir 27.

[0006]

However, in the above-mentioned scroll type compressor, oil separation was not sufficient only by balance weight or stirring of the rotor, and oil was found to flow out of the compression chamber into the system.

Accordingly, an object of the present invention is to provide a scroll compressor in which the separation between refrigerant and oil is further improved.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a stator having a sealed case having a discharge port on an upper portion, a plurality of arms fixed to the sealed case and having coils wound thereon, and an inner side of the stator. An electric motor composed of a rotor that rotates the motor, a drive shaft fixedly penetrating through the center of the rotor, an upper end side of the drive shaft fixed to the inner surface of the sealed case, and the discharge port and the high pressure A support plate having an opening communicating the space, a block fixed to the closed case while rotatably holding a lower end side of the drive shaft, and eccentrically protruding from the lower end of the drive shaft to the drive shaft. An eccentric shaft, an eccentric scroll member mounted on the eccentric shaft and rotating while preventing rotation,
A fixed scroll member fixed to the block while the eccentric scroll member meshes to form a compression chamber,
In a scroll-type compressor having an oil reservoir formed on the block upper surface, a rotation space in which the rotor rotates, and a shielding plate disposed between an opening of the support plate, and a high-pressure refrigerant in the rotation space, It is to detour to the opening of the support plate (claim 1).

Therefore, according to the present invention, the shielding plate is provided between the rotating space in which the rotor rotates and the opening of the support plate, so that the refrigerant that has risen in the rotating space passes through the shielding plate. Collision changes the direction, passes between the coils wound around the stator, collides with the inner peripheral surface of the sealed case to change the direction, and further collides with the support plate to change the direction. It reaches the discharge port through the opening formed in the plate. As described above, since the refrigerant repeatedly changes the direction by repeating the collision at least three times, the separation property between the refrigerant and the oil can be improved.

[0010] Further, the shielding plate must be made of non-metal (claim 2). This is because it must be made of a material having a high insulating property in order to be disposed at the upper end of the coil of the stator.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a scroll compressor in which the present invention is implemented, and the scroll compressor 1 will be described below.

The scroll type compressor 1 has a cylindrical case 3 in which a suction pipe 2 is formed, an upper lid 4 for closing an upper end of the case 3, and a bottom lid 5 for closing a lower end of the case 3. Sealed case 6 formed by
And a power supply terminal 9 for supplying power to the discharge pipe 7 and the electric motor 8.

The electric motor 8 is usually a brushless motor, and includes a drive shaft 10 for transmitting a rotational force,
And a stator 13 having a plurality of arms around which a coil 12 is wound around a rotor 11 which is disposed at a position facing the rotor 11 alternately around the periphery thereof. Is done. Then, the coil 12 is rotated so as to generate a rotating magnetic field in the stator 13.
, And the rotor 11 is rotated. In the high-pressure space 39 described below,
The space in which the rotor 11 rotates is particularly referred to as a rotation space 82.

The upper end of the drive shaft 10 is rotatably supported by a support plate 14 fixed to the case 3 of the closed case 6 via a bearing 15.
Is rotatably supported by a main bearing 18 provided in a through hole 17 passing through the center of the block 16. A turning shaft 19 projects eccentrically from the lower end surface of the drive shaft 10, and a peripheral portion of the lower end surface of the drive shaft is supported by the block 16 via a seal ring 33. The support plate 14 is formed with a plurality of openings 14a communicating with the high-pressure space 39 located below the support plate 14 and the discharge-side space 81 located above the support plate 14. It is.

In the vicinity of the drive shaft 10 below the rotor 11, there is mounted a balance weight 21 for balancing the rotation with a revolving scroll member 40 described below, which is revolvably mounted on the revolving shaft 19. Block 1
A balance weight cover 22 is provided at the upper end of 6 so as to surround the balance weight 21.

The balance weight cover 22 is constituted by legs 23 and a peripheral wall portion 24. The peripheral wall portion 24 defines a turning space 25 of the balance weight 21, and one end of the leg portion 23 has one end. The peripheral wall portion 24
Is formed with a refrigerant passage 26 which is open at the bottom portion 24a. Also, this balance weight cover 22
Is provided so that the lubricating oil contained in the oil reservoir 27 does not hinder the rotation of the balance weight 21, and separates the turning space 25 from the oil reservoir 27.

Further, the main bearing 17 of the drive shaft 10
At least one (two in the drawing) spiral groove 29 that rises spirally is formed in the contact sliding side surface 28. An oil guide hole 30 is formed to extend from the lower end side surface of the drive shaft 10 to the lower end surface of the turning shaft 19.

The block 16 has the through hole 18 formed at the center thereof, and further has a swivel space 31 in which a swivel bearing 41 formed in the orbiting scroll member 40 can swivel.
It is installed continuously from. Also, on the upper surface of the block 16,
An oil supply hole 32 communicating the oil reservoir 27 and a lower end portion of the through hole 18 is formed radially.
Of the drive shaft 10 and the seal ring 3
An oil space 34 is defined by the block 3 and the block 16. Note that a filter 35 is disposed in the oil supply hole 32.

The oil staying in the oil sump 27 reaches the oil space 34 from the oil supply hole 32 via the filter 35, and rises in the spiral groove 29 to be in the oil sump 27.
And from the oil guide hole 30 to the suction space 51 while lubricating the eccentric bearing 19, the contact sliding surface between the block 16 and the orbiting scroll member 40, and the various parts of the Oldham ring 38, together with the refrigerant. The suction is sucked into the compression chamber 55 to lubricate and seal the abutting sliding portion of the orbiting scroll member 40 and the fixed scroll member 50, and the refrigerant moves from the discharge space 56 through the refrigerant passages 57 and 26 to rotate the balance weight 21. The balance weight 21 and the rotor 11 reach the space 25 and the high-pressure space 39, and are stirred by the balance weight 21 and the rotor 11.
4 and the inner wall of the closed case 6 collides with the refrigerant,
It circulates through two routes that return to the oil reservoir 27.

On one side (upper side) of the orbiting scroll member 40 in the axial direction, a revolving bearing 41 into which the revolving shaft 19 is inserted so as to be revolvable is extended. By being inserted, the slewing bearing 4
1 defines a bearing space 42. On the lower surface of the orbiting scroll member 30, a orbiting scroll 43 forming a spiral groove protrudes downward. The orbiting scroll 43 meshes with a fixed scroll 53 forming a spiral groove protruding upward from a fixed scroll member 50 fixed to the block 16 to form a compression chamber 55.

Further, a suction space 51 communicating with the suction pipe 2 is formed in the side of the fixed scroll member 50, and the outermost end of the compression chamber 55 is formed in the suction space 51.
Open to The center side end of the compression chamber 55 communicates with a discharge hole 52 formed through the center of the fixed scroll member 50 in the axial direction. As a result, the orbiting scroll member 40 makes a revolving motion with respect to the fixed scroll member 50, so that the volume of the compression chamber 55 is gradually reduced from the suction side at the outermost end to the discharge side at the center side end. In addition to performing the compression action, the suction side volume is increased to perform the suction action. The orbiting scroll member 40 is prevented from rotating by an Oldham ring 38 disposed between the orbiting scroll member 40 and the block 16, and performs a orbiting motion without rotating with respect to the fixed scroll member 50. .

The refrigerant compressed in the compression chamber 55 is discharged from the discharge hole 52 to a discharge side space 56,
From the refrigerant passage 57 to the refrigerant passage 26,
5, the pressure reaches the high-pressure space 39, and is sent from the discharge pipe 7 to the next process.

A valve insertion space 54 into which the check valve 60 is inserted is formed in the discharge hole 52, and a check valve holding portion 92 is inserted around the periphery of the valve insertion space 54. You. Accordingly, when the refrigerant flows backward from the discharge side space 56, the check valve 60 inserted into the valve insertion space 54 closes the discharge hole 52, thereby preventing the refrigerant from flowing backward from the discharge side space 56. It is designed to prevent it.

Further, the fixed scroll member 50 is formed with a bypass hole 58 communicating the compression chamber 55 and the discharge side space 56, and is opened and closed by a relief valve 70. Thus, when the pressure in the compression chamber 55 becomes equal to or higher than a predetermined value due to liquid compression or the like, the relief valve 71 opens the bypass hole 58 and releases the pressure in the compression chamber 55 to the discharge side space 56.

The scroll type compressor 1 having the above configuration
, A shielding plate 80 for closing the upper side of the rotating space 82 is provided at the upper end of the coil 12 wound around the stator 13. The shielding plate 80 is made of a non-metal having high insulating properties such as a synthetic resin.
The bridge is bridged to the upper end of 2.

As a result, when the electric motor 8 is operated and the drive shaft 10 rotates, the orbiting scroll member 40 performs a orbiting motion that does not rotate with respect to the fixed scroll member 50, whereby the orbiting scroll member 40 and the fixed scroll member 40 are rotated. The compression chamber 55 defined by 50 repeats a compression movement that gradually reduces its volume from outside to inside. In this compression movement, the refrigerant is sucked from the suction space 51 and is compressed in the compression chamber 55, and then is discharged.
It discharges the refrigerant at a high pressure from 2.

The high-pressure refrigerant discharged from the discharge holes 52 passes through the refrigerant passages 57 and 26 from the discharge space 56 to reach the rotating space 25 of the balance weight 21 and is stirred by the rotation of the balance weight 21. The collision with the inner peripheral surface of the peripheral wall portion 24 of the balance weight cover 22 causes the first
The next oil separation takes place. The oil separated here is blown off toward the oil reservoir 27 by the discharge force of the refrigerant, and returns to the oil reservoir 27.

Further, the refrigerant containing oil is supplied to the rotor 1
The rotation reaches the first rotation space 82, which is then stirred by the rotation of the rotor 11, and collides with the inner peripheral surface of the stator 13 or the inner peripheral side surface of the sealed case 6, whereby the second oil separation is performed. The oil separated here returns to the oil reservoir 27 by its own weight.

Further, the refrigerant containing oil rises in the rotating space 82 and collides with the above-mentioned shielding plate 80 to change its direction outward. At this time, the third oil separation is performed. In this case, since the oil adheres to the bearing 15, the lubricity of the bearing 15 can be improved, and the oil adhered to the shielding plate 82
Since it drops along the coil 12 to reach the oil reservoir 27,
The coil 12 can be cooled.

Further, the refrigerant bent outward due to the collision of the shielding plate 80 collides with the inner peripheral side surface of the sealed case 6 and changes its direction upward. At this time, a fourth oil separation is performed. The oil separated here drops along the inner peripheral side surface of the sealed case 6 and returns to the oil reservoir 27.

The refrigerant that has turned upward due to the collision of the sealed case 6 collides with the support plate 14, and the fifth oil separation is performed. The refrigerant enters the discharge space 81 through the opening 14a, and is discharged into the discharge pipe 81. The process is sent from step 7 to the next step. Here, the separated oil drops along the inner peripheral side surface of the closed case 6 and returns to the oil reservoir 27.

[0033] Thus, compared with the conventional primary to secondary oil separation, the primary to fifth oil separation can be performed. The oil contained can be separated from the refrigerant.

[0034]

As described above, according to the present invention, the shield plate 80 for closing the upper side of the rotating space in which the rotor rotates is provided at the upper end of the coil wound around the stator 13 so that As compared with the first to the second oil separation, the first to the fifth oil separation can be performed, so that the oil separation ability can be improved and the upper end of the drive shaft is supported. The bearing can be lubricated.

Further, since the discharged refrigerant is bypassed by providing the shielding plate, the discharged refrigerant is rectified, so that the effect of reducing noise is achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a scroll compressor according to a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll type compressor 6 Closed case 7 Discharge pipe 8 Electric motor 10 Drive shaft 11 Rotor 12 Coil 13 Stator 14 Support plate 16 Block 21 Balance weight 22 Balance weight cover 25 Swirling space 27 Oil reservoir 32 Eccentric shaft 39 High pressure space 40 Swirling scroll member 50 Fixed scroll member 55 Compression chamber 80 Shield plate 81 Discharge space 82 Rotation space

Claims (2)

[Claims] An electric motor comprising a sealed case having a discharge port on an upper part, a stator fixed to the sealed case and having a plurality of arms wound with coils, and a rotor rotating inside the stator; A drive shaft fixedly penetrating through the center of the rotor, and a support plate fixed to an inner surface of the sealed case and supporting an upper end side of the drive shaft and having an opening communicating the discharge port and the high-pressure space. A block fixed to the closed case while rotatably holding the lower end side of the drive shaft, an eccentric shaft protruding eccentrically from the lower end of the drive shaft to the drive shaft, and mounted on the eccentric shaft. An eccentric scroll member that rotates while being prevented from rotating, a fixed scroll member fixed to the block while the eccentric scroll member meshes to form a compression chamber, In a scroll compressor having an oil reservoir formed on an upper surface of a block, a shielding plate is arranged between a rotating space in which the rotor rotates and an opening of the support plate, and the high-pressure refrigerant in the rotating space is A scroll type compressor characterized by being detoured to an opening of a support plate. 2. The scroll compressor according to claim 1, wherein the shielding plate is made of a non-metallic material.