JPS6115276Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary compressor lubricating oil supply device for supplying lubricating oil to the sliding parts of the rotary compressor.

(Prior Art) Generally, a rotary compressor is provided with a lubricating oil supply device for purposes such as improving the lubricity of sliding parts, preventing wear, dissipating heat from heating parts, and maintaining airtightness of mechanical seals. When a rotary compressor is used in a cooling cycle, the lubricating oil is mixed with the refrigerant in the cylinder, so an oil separation mechanism is built into the lubricating oil circulation system, and the separated circulating oil is stored in a storage room,
The lubricating oil in this oil reservoir chamber is supplied to each sliding part using refrigerant discharge pressure.

In other words, as shown in Fig. 1, the rotary compressor has a front (bearing) plate 2 and a rear (bearing) plate 2 on the left and right sides of a cylinder 1.
A rotor 5 rotated by a rotating shaft 4 is housed within the cylinder 1, which is closed by a plate 3.
Vane grooves 15 are formed in the rotor 5 in a substantially radial direction at substantially equal intervals in the circumferential direction, and vanes 5a are housed in the vane grooves 15 so as to be slidable in the substantially radial direction.
The left side portion of the rotating shaft 4 in the figure is rotatably supported by the bearing portion of the front plate 2 via a bearing 6, and the right side portion in the figure is supported by the rear plate 3.
is rotatably supported via a bearing 8 in a bearing section. Note that a mechanical seal 7 is attached to the left end of the rotary shaft 4 since sealing performance is required. The right end portion of the rotating shaft 4 is protruded outside the rear plate 3, and an oil amount adjusting plate 9 is attached to the protruding portion.
is fixed. The oil amount adjusting plate 9 has a disk shape and is covered by a cover 10, from which a lubricating oil supply pipe 11 is suspended into an oil reservoir chamber 12. That is, this oil amount adjusting plate 9 is a disc-shaped rotating member provided inside the cover 10, and the discharge pressure of the compressor pressurizes the oil level in the oil reservoir chamber 12, so that it is pushed up through the oil supply pipe 11. The oil is transferred to the oil amount adjustment hole 1 provided in the hot water amount adjustment plate 9.
3, the oil feed hole 14 provided in the rear plate 3
It is a kind of control member that guides only the appropriate amount. This hot water amount adjusting plate is commonly referred to as a rotary oil pump by those skilled in the art.

Further, the cylinder side of the oil feed hole 14 is aligned with the vane groove 15 of the rotor, and this vane groove 1
The front side of 5 is aligned with the oil feed hole 16 provided in the front plate 2, and furthermore, this oil feed hole 16
is connected to the mechanical seal 7.

(Problems to be Solved by the Invention) Therefore, in such a lubricating oil supply device, the lubricating oil in the oil reservoir chamber 12 is supplied to the oil supply pipe 11, the oil amount adjustment hole 13, and Through the oil feed hole 14, vane groove 15, and oil feed hole 16, especially the sliding portion between the vane 5a and the vane groove 15, and the vane 5.
It is possible to sufficiently lubricate the sliding portions between a and the inner wall of the cylinder 1 and the sliding portions between the front plate 2 or rear plate 3 and the rotor 5. However, since lubricating oil is not directly supplied to the bearings 6 and 8, there is a problem in that the bearing portion of the rotating shaft 4 (the sliding portion between the bearings 6 and 8 and the rotating shaft 4) is not sufficiently lubricated. In order to solve this problem, it is conceivable to branch the oil feed holes 14 and 16 to form bearing oil feed holes 14a and 16a. It was difficult to separate the appropriate amount of lubricating oil, and there was a risk that an excessive amount of lubricating oil would be supplied to either the cylinder 1 or the bearings 6 and 8, or that one of the bearings would be insufficiently lubricated. . In any case, if lubricating oil is insufficiently supplied to any part, wear will progress and durability will be impaired, and if lubricating oil is supplied too much into the cylinder 1, Even if the excess lubricating oil passes through the oil separation mechanism, it is not sufficiently separated, and an excessive amount of the lubricating oil is circulated through the cooling cycle together with the refrigerant, which may deteriorate the cooling performance. Therefore, in rotary compressors used in cooling cycles, it is important to supply appropriate lubricating oil to each sliding part.

In addition, as shown in Utility Model Application Publication No. 52-64911,
The rotating shaft is provided with an oil feed hole extending along its axis, and a pump device (such as a vortex pump or a viscous pump) is attached to one end of the rotating shaft, and this pump device supplies lubricating oil to the oil feed hole. A rotary compressor has also been proposed in which the compressor is pumped through the compressor to each sliding section. However, with the method of force-feeding lubricating oil using a pump device, there is a risk that an excessive amount of lubricating oil will flow into each sliding part, so it is necessary to control the lubricating oil suction pressure with a regulating valve, etc. There was a risk that the score would increase. In addition, since lubricating oil is supplied from the oil supply hole formed along the axis of the rotating shaft toward the rear end of the vane, if the supply pressure of the lubricating oil is not sufficient, the tip of the vane and the inner wall of cylinder 1 There was a risk that lubricating oil would not be supplied to the sliding surfaces of the parts.

The present invention has been made in order to improve such inconveniences, and an object of the present invention is to provide a lubricating oil supply device for a rotary compressor that can supply an appropriate amount of lubricating oil to each sliding part.

(Means for Solving the Problems) In order to achieve the above object, the present invention obstructs the front and rear parts of a cylinder that rotatably accommodates a rotor provided on a rotating shaft with a front plate and a rear plate. Vane grooves are formed approximately radially in a plurality of positions in the circumferential direction of the rotor located inside the cylinder, and a vane is accommodated in each vane groove so as to be slidable approximately in the radial direction, and the vane and the inner wall of the cylinder are connected to each other. In a rotary compressor, a compression chamber space is formed by the outer circumferential surface of the rotor and the inner wall of the plate, and a discharge port for fluid compressed in the compression chamber space is communicated with an oil reservoir chamber in which lubricating oil is stored in the lower part of the rotary compressor. , a disk-shaped oil volume adjustment plate is fixed to the end of the rotating shaft on the oil reservoir side, and the oil volume adjustment plate is communicated with lubricating oil stored in the lower part of the oil reservoir chamber. A tube is surrounded by a cover in which a pipe is formed and the rear plate, and the oil amount adjusting plate is formed in the rear plate, and one end is opened at approximately the same radial position as the vane groove, and is inserted into the cylinder. A plurality of oil amount adjustment holes whose radial position coincides with the opening of the other end of the communicating oil supply hole and whose radial position coincides with the oil supply port at the upper end of the oil supply pipe, a communication groove that is formed along the axis and communicates with the oil supply hole that communicates with the bearing, and that communicates with the oil supply port at the upper end of the oil supply pipe at a predetermined rotational position of the oil amount adjustment plate;
It is characterized by the fact that it has been formed.

(Function) According to such a configuration, the amount of lubricating oil supplied to the sliding portion of the vane and the sliding portion of the bearing is controlled by the oil adjustment hole and the communication groove formed in the oil amount adjustment plate. By appropriately setting the number, length, width, etc. of each, each can be adjusted separately, so it is possible to supply appropriate lubricating oil to each sliding part.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 2 to 6. In this embodiment, a case will be described in which a rotary compressor is used in an automobile cooling cycle.

As shown in FIGS. 2 and 3, in the rotary compressor according to this embodiment, the rotating shaft 4 to which the rotor 5 is attached is rotatably supported by bearings 6 and 8 attached to the front plate 2 and rear plate 3. I support it. The rotor 5 has four vane grooves 15 formed in a substantially radial direction at substantially equal intervals in the circumferential direction, and a vane 5a is accommodated in each of the vane grooves 15 so as to be slidable in the substantially radial direction. be.

The rotor 5 to which these vanes 5a are attached is
A compression chamber space 20 is formed in a space sealed within the cylinder 1 and surrounded by the vane 5a, the inner wall of the cylinder 1, the outer peripheral surface of the rotor 5, and the inner walls of the plates 2 and 3. The inner wall of cylinder 1 is elliptical,
Since the outer circumferential surface of the rotor 5 is a perfect circle, the volume of the compression chamber space 20 changes as the rotor 5 rotates, compressing the refrigerant sucked in from the suction port 21 formed in the cylinder 1 to a high pressure. After that, it is discharged from the discharge port 22 into the sealed casing 23. Note that a discharge valve 24 is attached to the discharge port 22 in order to control the refrigerant discharge pressure.

Further, the discharge port 22 communicates with the oil reservoir chamber 12 shown in FIG. 2 via an oil separation mechanism (not shown). The oil separation mechanism separates some lubricating oil contained in the refrigerant and returns the lubricating oil to the oil reservoir chamber 12. Note that a certain amount of lubricating oil remains in the refrigerant and circulates within the cooling cycle together with the refrigerant.

In particular, in this embodiment, a disk-shaped oil amount adjusting plate 25 is fixed to the end of the rotating shaft 4 on the oil reservoir 12 side. This oil amount adjusting plate 25 is surrounded by the rear plate 3 and the cover 10 in which the oil supply pipe 11 communicating with the lubricating oil stored in the lower part of the oil reservoir 12 is formed.
An oil supply hole 4a is drilled along the axis at the center of the oil amount adjusting plate 9. This oil supply hole 4a extends through the shaft toward the front plate 2 and communicates with the bearing 8 on the rear plate side, the bearing 6 on the front plate side, and the inner surface of the mechanical seal 7, forming a first oil supply system _K1 for supplying lubricating oil to the bearing 6 etc.

Further, as shown in FIG. 4, the oil amount adjusting plate 2
5 has oil adjustment holes 17, 17...17 consisting of four arc-shaped elongated holes radially inward from the outer peripheral surface.
has been formed.

On the other hand, as shown in FIG. 2, the rear plate 3 and the front plate 2 each have oil feed holes 1
4 and 16 are formed. One open end of each oil feed hole 14, 16 communicates with the inside of the cylinder 1 at approximately the same radial position as the vane groove 15. The other open end of the oil feed hole 16 communicates with the mechanical seal 7, and the other open end of the oil feed hole 14 extends in the direction of the oil amount adjusting plate 25. The radial position of the oil amount adjustment hole 17 formed in this oil amount adjustment plate 25 is determined by the oil supply hole 1.
The radial position coincides with the other open end of No. 4. Therefore, as the oil amount adjustment plate 25 rotates, the oil amount adjustment hole 17 and the oil feed hole 14 communicate with each other or do not communicate with each other.
Moreover, since the radial position of the oil amount adjustment hole 17 formed in this oil amount adjustment plate 25 is designed to approximately match that of the upper end oil supply port 11a of the oil supply pipe 11, this oil amount adjustment is performed. Hole 17 and upper oil supply port 11
The communication with a is also controlled by the rotation of the oil amount adjusting plate 25. That is, the upper end oil supply port 11a and the oil feed hole 14 are communicated via the rotating oil amount adjustment hole 17, so that an appropriate amount of lubricating oil flows from the upper end oil supply port 11a to the oil feed hole 14. , these oil amount adjustment hole 17, oil feed hole 14, etc. constitute a second oil supply system _K2 .

Furthermore, as shown in FIG.
A communication groove 18 is formed between the oil amount adjustment holes 17 and communicates with an oil feed hole 4a bored in the center of the rotating shaft 4, and extends radially around the oil feed hole 4a. . This communication groove 18 is configured such that the tip of the communication groove 18 communicates with the oil supply hole 4a and the upper oil supply port 11a at a predetermined rotational position of the oil amount adjustment plate 9. It is adapted to be distracted to a position consistent with the directional position.

Therefore, when the oil amount adjustment plate 25 is rotated by the rotating shaft 4, the oil level is pressurized by the compressed gas discharged from the discharge port 22 into the sealed casing 23, and the oil level in the oil reservoir chamber 12 is increased. The lubricating oil is led to the oil amount adjustment hole 17 or the communication groove 18 through the oil supply pipe 11, and the oil that has passed through the oil amount adjustment hole 17 is introduced to the oil feed hole 14 of the rear plate, the vane groove 15, and the front plate 2. When passing through the oil supply hole 16 of The oil passing through the groove 18 is transferred to the rotating shaft 4
The oil is mainly supplied to the front and rear bearings 6, 8 and the inner wall of the mechanical seal 7 through the oil supply hole 4a.

Since there are two lubricating oil supply systems in this way, it is possible to supply lubricating oil to each of the sliding portions in just the right amount. Furthermore, since it is located at the farthest position from the oil amount adjustment plate and lubricating oil is supplied from one system, an appropriate amount of lubricating oil can be supplied.

In particular, in the present invention, the amount of lubricating oil supplied to each sliding portion is not limited to the above-mentioned embodiments, but is determined by the number of oil amount adjustment holes 17 and communication grooves 18 formed, the length and width of the oil amount adjustment hole 17, Width of communication groove 18, each oil feed hole 4a, 1
Adjustment can be made by appropriately determining the diameters of holes 4 and 16. Therefore, for example, to supply lubricating oil evenly to both oil supply systems K ₁ and K ₂ ,
The oil supply port 11a and the oil amount adjustment hole 17, or the oil supply port 11a and the communication groove 18, are in communication for the same amount of time, or the oil amount adjustment hole 17 is
This can be adjusted by, for example, setting the width of the communication groove 18 to a predetermined ratio.

In the embodiment shown in FIG. 4, the communication groove 18 is formed between the oil amount adjustment hole 17, but as shown in FIG.
There may be a communication groove 18a that communicates with the
As shown in FIG. 6, a communication groove 18b may be formed in a cross shape between the oil amount adjustment holes 17.

(Effect of the invention) The present invention has a communication groove 18 that communicates with the oil feed hole 4a of the rotating shaft and an oil amount adjustment hole 17 that communicates with the oil feed hole 14 that communicates with the vane groove etc. in the oil amount adjustment plate itself. and a first oil supply system that communicates with this communication groove 18.
K ₁ and the second oil supply system that communicates with the oil amount adjustment hole 17
By distributing an _appropriate amount of lubricating oil to each sliding part of the compressor, it is possible to supply just the right amount of lubricating oil to each sliding part of the compressor, improving the performance and durability of the compressor. play.

In addition, without providing a pump device that has a suction action, just by providing a communication groove with an appropriate oil amount adjustment hole on the oil amount adjustment plate, it is possible to supply just the right amount of oil. Extra parts such as a lubricating oil suction pressure regulating valve are not required, and the number of parts and assembly man-hours do not increase.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part of a conventional rotary compressor, and Fig. 2 is a longitudinal cross-sectional view of the main part of a rotary compressor according to an embodiment of the present invention (-
(cross-sectional view along the line), Figure 3 is shown in Figure 2 -
4 is a plan view of an oil amount adjusting plate according to the same embodiment, and FIGS. 5 and 6 are plan views of oil amount adjusting plates according to other embodiments. 1... Cylinder, 2... Front (bearing) plate, 3... Rear (bearing) plate, 4... Rotating shaft, 5... Rotor, 4a, 1
4, 16... Oil feed hole, 9, 25... Oil amount adjustment plate,
11... Oil supply pipe, 11a... Upper end oil supply port, 17...
...Oil amount adjustment hole, 18, 18a, 18b...Communication groove, 20...Compression chamber space, 22...Discharge port,
K ₁ , K ₂ ... Oil supply system.

Claims (1)

[Claims for Utility Model Registration] 1. A cylinder 1 that rotatably accommodates a rotor 5 provided on a rotating shaft 4 through bearings 6 and 8 is closed at the front and rear with a front plate 2 and a rear plate 3, and is located within the cylinder 1. The rotor 5
Vane grooves 15 are formed approximately radially in a plurality of positions in the circumferential direction, and a vane 5a is accommodated in each vane groove so as to be slidable in the approximately radial direction. A compression chamber space 20 is formed by the surface and the inner walls of the plates 2 and 3, and a discharge port 22 for fluid compressed in the compression chamber space 20 is communicated with an oil reservoir chamber 12 in which lubricating oil is stored in the lower part. In this rotary compressor, a disk-shaped oil amount adjustment plate 9 is fixed to the end of the rotating shaft 4 on the oil reservoir chamber 12 side, and the oil amount adjustment plate is connected to the lubricant stored in the lower part of the oil reservoir chamber 12. It is surrounded by the rear plate 3 and a cover 10 in which an oil supply pipe communicating with the oil is formed, and is formed on the oil amount adjustment plate 9 and the rear plate 3, and one end is connected to the vane groove 15 and the radius. The radial position coincides with the opening of the other end of the oil supply hole 14 which opens at approximately the same position as the oil supply hole 14 and communicates with the inside of the cylinder 1, and the upper end oil supply port 1 of the oil supply pipe 11.
A plurality of oil amount adjustment holes 17 whose radial positions coincide with 1a and an oil feed hole 4a formed along the axis of the rotating shaft 4 and communicating with the bearings 6 and 8, and the oil supply pipe A lubricating oil supply device for a rotary compressor, characterized in that a communication groove 18 that communicates with the upper end oil supply port 11a at a predetermined rotational position of the oil amount adjusting plate 7 is formed. 2. The lubricating oil supply device for a rotary compressor according to claim 1, wherein a plurality of the oil volume adjustment holes are formed in an arc shape, and the communication groove is formed between the oil volume adjustment holes. 3. The lubricating oil supply device for a rotary compressor according to claim 1, wherein the communication groove communicates the oil feed hole of the rotating shaft with the oil amount adjustment hole.