JP2563591B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll-type electric compressor.

2. Description of the Related Art FIG. 4 shows an example of a conventional small-sized electric compressor disclosed in Japanese Patent Laid-Open No. 59-197774, which temporarily stores a large amount of refrigerant liquid in the refrigerant sucked in the compressor body 201. A large accumulator 202 is attached to avoid violent liquid compression of the compression mechanism.

 FIG. 5 is from JP-A-57-70984.

A compression mechanism 102 and a stator 103 of an electric motor below the compression mechanism 102 are fixed inside the closed casing 101, and a lubricating oil reservoir 104 for collecting lubricating oil is further provided below the compression mechanism 102.

The compression mechanism 102 includes a fixed spiral blade part 107 having a fixed spiral blade 106 integrally formed on a fixed end plate 105, and a swirling spiral blade 108 that meshes with the fixed spiral blade 106 to form a plurality of compression working spaces 111. Are formed on the turning head plate 109, a rotation restricting member 112 that prevents the turning spiral blade member 110 from rotating, and turns only, and a turning drive shaft 113 provided on the turning head plate 109. Crankshaft 115 having eccentric drive bearing 114 for eccentric turning drive and its main shaft 11
6 is composed of a bearing part 119 and the like that are supported by a main bearing 117.

In addition, the fixed end plate plane 120 on the side of the turning end plate of the fixed end plate 105
The rotating head plate 109 is slidably brought into contact with the rotating head plate surface 121 on the fixed head side of the turning head plate 109, and the turning head plate 109 is provided with an intermediate pressure hole 122 communicating with the compression working space 111.
The back pressure chamber 123 on the opposite side of the swirling spiral blade 108 is maintained at a pressure intermediate between the discharge pressure and the suction pressure.

Suction from the suction pipe 124 of the compressor, suction space 125, suction port 12
The refrigerant gas sucked into the compression mechanism 102 from 6 is compressed in the compression work space 111, then exits the discharge hole 127, and the compression mechanism 10
It is discharged to the outside of the compressor from a discharge pipe 129 through a discharge chamber 128 below

A portion of the lubricating oil in the lubricating oil reservoir 104 is branched from an oil supply passage 130 penetrating the main shaft 116 of the crankshaft 105, and is supplied to the main bearing 117 via a branch oil supply passage 131. Some other lubricating oil is supplied from the oil supply passage 130 to the oil supply amount limiting portion 132 of the eccentric drive bearing 114.
The pressure is reduced through the gap of and is discharged to the back pressure chamber 123.

The lubricating oil in the back pressure chamber 123 is compressed from the intermediate pressure hole 122 and the like through the compression work space 111, and is discharged from the compression mechanism together with the refrigerant.

Problems to be Solved by the Invention Recently, air conditioners for both air-conditioning and heating are used under a very wide load condition, and the amount of the enclosed refrigerant is extremely large. Therefore, the accumulator attached to the compressor installed in these air conditioners is large. Occupies space and area.

If the scroll type electric compressor has a structure as shown in FIG. 5, cited reference patent and the accumulator is built in the compressor body, the occupied area and volume of the compressor will be small,
Since the high temperature compression mechanism is at the bottom and the suction space 125 corresponding to the accumulator is at the top, the suction refrigerant is overheated and the efficiency of the compressor is significantly reduced.

On the contrary, when the suction space is located below the compression mechanism, the above-mentioned overheating of the suction refrigerant is remarkably alleviated, but the lubricant returned to the compressor together with the suction refrigerant stays at the bottom of the suction space, Lubrication of the compressor is hindered.

In any case, it is necessary to install a check valve to prevent the discharge refrigerant gas and the lubricating oil from flowing back to the suction side and the compressor from reversing at the moment when the compressor stops.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to dispose an electric motor inside a closed container and a compression mechanism below and to fix this compression mechanism to a fixed spiral blade. Parts, a swirling spiral blade part, a rotation restraint part, a crankshaft, and a main shaft of the crankshaft including a bearing part, and a motor-side space where discharge pressure acts inside the sealed container and a compression mechanism lower part. Is divided into a suction space where pressure on the suction side acts, a suction port is provided in the fixed end plate, a small hole is provided in the vicinity of this suction port, and a pipe passage communicating with the bottom of the suction space is connected to this small hole. In addition, a check valve that opens and closes the suction port and the small hole in common is provided.

Operation The operation of the technical means of the present invention described above does not require the provision of a large suction space inside the airtight container of the compressor and the attachment of a large accumulator outside the compressor body. The provision of this suction space below the closed container reduces the heat transfer from the compression mechanism to the suction refrigerant in the suction space.

Furthermore, since the pressure in the space between the suction port and the suction hole is slightly smaller than the pressure in the suction space, the lubricating oil or the refrigerant liquid accumulated at the bottom of the suction space is sucked into the suction port through the pipe passage.

The passage end on the end plate side of the pipe passage is opened and closed in common with the suction hole by the check valve.

Embodiment As an embodiment of the present invention, FIG. 1 shows a cross section of a scroll type electric compressor.

A compression mechanism 2 and a stator 3 of an electric motor for driving the compression mechanism 2 are fixed inside the closed container 1, and a lubricating oil reservoir 4 is provided below the electric motor.

The compression mechanism 2 swivels a fixed spiral vane component 7 having a fixed spiral vane 6 integrally formed with a fixed end plate 5, and a swirl spiral vane 8 that meshes with the fixed spiral vane 6 to form a plurality of compression work spaces 11. A swirling spiral blade part 10 formed on the end plate 9, a rotation restraint part 12 for preventing the swirling spiral blade part 10 from rotating and only turning, and a swivel drive shaft 13 provided on the swivel end plate 9 for eccentric swirling. It is composed of a crankshaft 15 having an eccentric drive bearing 14 to be driven, a bearing component 19 having a main bearing 17 for supporting a main shaft 16 of the crankshaft below a rotor 12 of an electric motor, and the like.

A ball bearing 21 fixed to a partition wall 20 is fitted into the upper end of the crankshaft 15, and the partition wall 20 partitions a space above the stator 3 and the rotor 12 of the motor into a motor-side space 22 and a discharge chamber 23.

The annular projection 18 provided on the outer periphery of the bearing part 19 is
It is sandwiched between the lower end of 27 and the upper end of lower part 28 of the sealed container, and is hermetically welded together.

The refrigerant gas that enters the suction space 30 inside the closed container lower part 28 from the suction pipe 29 of the compressor and is drawn into the compression mechanism 2 from the suction hole 31 is compressed in the compression work space 11 and then provided on the revolving head plate 9. From the discharge hole 32 through the turning drive shaft 13, through the communication hole 33 provided in the crankshaft 15, and through the crankshaft enclosure 34.
Through the communication passage 36 provided around the stator 3 of the electric motor, is guided to the electric motor side space 22 above the stator 3, passes through the passage hole 24, and enters the discharge chamber 23. , Discharge pipe 37
From the compressor.

Lubricating oil and refrigerant liquid are sucked into the compression mechanism 2 from the pipe passage 38. The end plate 39 is fixed to the fixed end plate 9 via a heat insulating gasket 40.

FIG. 2 is a detailed view of the vicinity of the fixed spiral blade part 7 and the end plate 39 of FIG.
And a communication groove that connects them with each other.

In FIG. 3, a check valve 41 and a check valve retainer 44 are fixed by rivets 45 on the suction hole 31 of the end plate 39. Check valve 41 is end plate 39
The situation is shown in which a small hole 46 is provided on the surface that abuts against.

 The small hole 46 is connected to the pipe passage 38.

As described above, the effect of the technical means of the present invention is that by providing the suction space below the compression mechanism, the space for the accumulator outside the compressor body becomes unnecessary, and the occupied volume and It is possible to realize an efficient compressor that occupies a very small area and that does not overheat intake refrigerant.

In addition, the lubricating oil accumulated in the suction space is reliably returned to the compression mechanism with a slightly low pressure between the suction hole and the suction port, and when the compressor stops, all the holes leading to the suction space have check valves. Since it is closed by, extremely high reliability without reverse rotation or backflow of lubricating oil can be realized.

Furthermore, this compressor has a great effect that the compressor can be realized at a low cost only by the end plate made of a thin plate and a simple check valve.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of an electric compressor according to the present invention,
2 (a), (b) and (c) are plan views of the fixed end plate,
Sectional views, rear views, and FIGS. 3A and 3B are a plan view and a side view of the end plate, and FIGS. 4 and 5 are sectional views of a compressor showing different conventional examples. 1 ... Airtight container, 2 ... Compression mechanism, 3 ... Motor stator, 4 ... Lubricating oil reservoir, 5 ... Fixed end plate, 6 ... Fixed spiral blade, 7 ... Fixed spiral blade part, 8 ... Swirling spiral blades,
9: rotating head plate, 10: rotating swirl vane parts, 11: compression working space, 12: rotation restraining parts, 13: rotating drive shaft, 15
…… Crankshaft, 19 …… Bearing parts, 29 …… Suction pipe, 31…
... Suction hole, 37 ... Discharge pipe, 38 ... Pipe passage, 39 ... End plate,
40 ... Insulation gasket, 41 ... Check valve, 46 ... Small hole.

Front page continued (72) Inventor Hiroshi Karado 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Shigeru Muramatsu 1006 Kadoma, Kadoma City Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56 ) Reference JP 63-285286 (JP, A) JP 62-199984 (JP, A) JP 59-110884 (JP, A)

Claims (1)

(57) [Claims] 1. A fixed spiral vane component having an electric motor inside a closed container, a compression mechanism driven by the electric motor arranged below, and the compression mechanism having fixed spiral vanes formed on a fixed end plate. A swirling spiral vane component in which swirling swirl vanes that mesh with the fixed swirl vanes and form a plurality of working spaces are fixed or formed on a swirling end plate, and a rotation constraint that prevents the swirling spiral vane component from rotating and only rotates. A component, and a crankshaft for eccentrically driving the swirling spiral blade component,
It is configured to include a bearing component having a main bearing that supports the main shaft of the crankshaft, and the inside of the hermetic container is divided into a motor-side space where the discharge pressure acts and a suction space where the suction side pressure below the compression mechanism acts. An inlet is provided in the fixed end plate, and a small hole is provided in the vicinity of the inlet, and a pipe passage communicating with the bottom of the intake space is connected to the small hole, and the inlet and the small hole are commonly opened and closed. A scroll compressor equipped with a check valve.