JPH0740706Y2 - Gas compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an improvement of a rotary vane type gas compressor used in a car cooler or other relatively small refrigeration equipment.

<< Prior Art >> Conventionally, in a rotary vane type gas compressor, as shown in FIG. 3 and FIG. 4, a compressor body a has a cylinder block 1 having a substantially elliptic cylindrical inner circumference, and both sides of the cylinder block 1. In a cylinder chamber b formed by the attached front and rear side blocks 2 and 3, a rotor 6 having vane grooves 5, 5 ... A space portion 7 is formed in the rear portion of the rear side block 3, and a one-end opening type casing 9 for storing the lubricating oil 8 pressurized in the space portion 7 by the discharge pressure of the gas discharged from the discharge port of the cylinder chamber.
It is configured with.

Gas entering the cylinder chamber b through the intake port 1a of the cylinder block 1 from the intake hole 11 of the front head 10 is
As the vanes 5 move forward and backward as the rotor 6 rotates, they are compressed into high-pressure gas, and the discharge port 1b and the oil separator are separated.
The discharge hole of the casing 9 enters the space 7 through 12
It is discharged to the outside from 13.

In the rotary vane type gas compressor as described above, the lubricating oil 8 in the space 7 is formed in the rear and front side blocks 2, 3 and the cylinder 1 by the discharge pressure of the gas from the cylinder chamber b. The lubricating oil is supplied to the bearing portion of the rotor shaft 6a through the oil circulation passages 14, 15 and 16 for lubrication, and a part of the lubricating oil 8 is decompressed in the gap between the rotor bearing portions of the front and rear side blocks 2 and 3. Then, it is supplied to a slit (not shown) formed in the rotor 6 via the communication holes 17 and 18, and is used as a back pressure of the vane 5.

Therefore, the vane 5 can obtain the contact pressure of the vane with respect to the inner wall of the cylinder, that is, the vane pressure, by the reduced hydraulic pressure and the centrifugal force caused by the rotation of the rotor 6.

However, even after the rotor 6 rotates and the compressed gas is discharged from the discharge port 1b, there is a space partitioned by the cylinder block 1, the rotor 6 and the vane 5, and for example, oil mist is mixed in this space. When the liquefied refrigerant is present, the refrigerant and the like are compressed by the vanes 5, so that high pressure is generated and the vanes 5
Is immediately immersed in the rotor 6 against the back pressure of the lubricating oil and then protrudes. At the time of this re-projection, a sound is generated by colliding with the inner wall surface of the cylinder chamber b, causing so-called chattering. Has become.

For this reason, the applicant previously proposed a gas compressor in which the back pressure was adjusted by the amount of protrusion of the vanes by using No. 58-104381, and a high vane pressure was temporarily added near the discharge port. .

In the previous proposal, as shown in FIG. 4, on the outer circumferences of the bearings of both side blocks 2 and 3, a pair of sluices are fanned out in a 180 ° symmetrical position on the contact surface with the rotor 6 about the bearing. Grooves 19, 19 and 20, 20 are provided, and oil circulation paths 14, 15 communicating with the space 7 are provided at positions facing the discharge port 1b.
A pair of communication holes 21 communicated with.

According to this configuration, the back pressure can be applied by the fan-shaped countersinks 19 and 20 with a pressure distribution according to the vane discharge amount distribution, and the high-pressure lubricating oil causes the communication hole 21 in the portion where the chattering phenomenon occurs. Since it acts on the back surface of the vane 5 via the above, it can counteract the force of pushing down the vane 5, and as a result, the chattering phenomenon can be prevented.

Further, even in the case of a variable capacity gas compressor in which a control plate is interposed between the rotor 6 and the front side block 2, the applicant of the present invention similarly provides the countersink groove and the communication hole to prevent the chattering phenomenon. We have also proposed a device that can be used (Japanese Patent Application No. 61-273607 (Japanese Patent Laid-Open No. 63-129184).
issue).

<Problems to be Solved by the Invention> However, in the gas compressor according to the above proposal, the vane pressure is generated according to the rotation angle of the vane by providing the flat groove and the communication hole to which the high-pressure lubricating oil is supplied. With this configuration, the initial effect can be obtained when the rotor rotates at a relatively low speed. However, high speed rotation (about 30
(00 rpm or more), there is a drawback that the rotation torque increases and noise is generated.

The reason for this is that the vane groove 4 is separated from one of the flat grooves 19 and reaches the next flat groove 19, that is, immediately after the tip of the vane 5 has passed through the discharge port 1b (see FIG. 4). The vane groove 4 is maintained at a high pressure within a certain range including the state (indicated by arrow a), but when the rotor rotates at a low speed, the high pressure is released into the gap between the vane 5 and the vane groove 4 and requires the vane pressure. Although it is not possible to increase it more than the above, at high speed rotation, the time for releasing the pressure is not enough and a higher vane pressure than necessary is generated, which not only increases the rotation torque but also causes the noise due to the too high vane pressure. There was a problem that it occurred.

<Means for Solving the Problems> The present invention has been made to solve the above problems, and is a cylinder block having an inner peripheral substantially elliptic cylindrical shape provided between front and rear side blocks, and the cylinder. A cylinder chamber formed by the block and the both side blocks, and horizontally rotatably mounted in the cylinder chamber,
And a rotor having a plurality of vanes that can advance and retreat in a plurality of vane grooves provided in the radial direction, and a space portion for storing lubricating oil under discharge pressure at the rear portion of the rear side block, and the both side and A casing enclosing a cylinder block, and a plurality of flat grooves are formed on the rotor side of one or both of the side blocks at positions facing the vane groove, and the lubricating oil is passed through the rotary shaft portion of the rotor. A gas compressor configured to supply depressurized lubricating oil to the sweep groove and to supply the vane pressure by supplying the depressurized lubricating oil in the sweep groove to the vane groove when the vane groove and the sweep groove communicate with each other. In the above, while being formed in the one or both side blocks independently of the sweep groove, the vane groove is separated from one sweep groove to the next sweep groove. The one end is opened so that the tip of the vane faces the vane groove immediately after passing through the discharge hole in the closed section of the vane groove until it is caught, and the other end is opened to the space portion side, and A communication hole is provided for releasing the pressure in the vane groove to the space side immediately after the tip of the vane passes through the discharge hole.

<Operation> According to the present invention, when high pressure is generated in the vane groove immediately after the vane tip passes through the discharge hole during high speed rotation of the rotor, this high pressure is sufficiently transmitted to the space through the communication hole. It is released and, as a result, the vane is given an appropriate vane pressure.

<< Description of Embodiments >> Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, the same parts as those in the prior art will be designated by the same reference numerals, and the description of these components will be duplicated. Therefore, only new portions will be denoted by different reference numerals.

FIG. 1 is a side sectional view of a gas compressor according to the present invention, and FIG. 2 is a plan view showing a rear side block of the gas compressor.

In the gas compressor body a, the rear side block 3, the cylinder block 1 and the front side block 2 are
Oil distribution channels 14, 1 for supplying lubricating oil 8 as in the conventional case
5 and 16 are respectively formed, and the lubricating oil 8 under pressure in these oil flow paths is decompressed by the shaft portion of the rotor 6 to become medium pressure oil, and passes through the communication holes 17 and 18 to both side blocks 2 and 3. It is supplied to the flat grooves 19a, 19b and 20a, 20b.

In the figure, 30 is the oil distribution path 14 to the rotor 6 of the side block 3.
A pair of communication holes that are open to the side
It is opened between a and 19b, that is, the flat grooves 19a and 19b
It is provided independently of.

The positional relationship among the discharge port 1b, the communication hole 30, the sweep grooves 19a and 19b, and the vane groove 4 is shown in FIG. That is,
The discharge port 1b is displaced from the minor axis X of the cylinder b in the direction opposite to the rotation direction of the rotor 6, and the communication hole 30 is provided at a position slightly displaced from the discharge port 1b in the rotation direction of the rotor 6. . Immediately after the tip of the vane 5 passes through the discharge port 1b, the vane groove 4 communicates with the communication hole 30, and at this time, one of the sweep groove 19a and the vane groove 4 separates (see FIG. 2C), and the vane further extends. When the tip of 5 is located in the cylinder chamber b, which is the next compression working chamber, the vane groove 4 separates from the communication hole 30 and the other groove
It is formed so as to be located at 19b.

That is, one end of the communication hole 30 has one vane groove 4 and one vane groove.
The tip of the vane 5 is opened to face the vane groove 4 immediately after normalizing the discharge hole 1b within the closed section of the vane groove 4 which is separated from 19a and reaches the next sweep groove 19b. The other end is opened to the space portion 7 side through the oil circulation path 14.

As described above, according to the above-described embodiment, when a high pressure is generated in the vane groove immediately after the vane tip passes through the discharge hole during high speed rotation of the rotor, this high pressure is sufficiently passed through the communication hole. It is discharged into the space, and as a result, the vane is given an appropriate vane pressure.

Therefore, even when the rotor 6 rotates at a high speed, the vane pressure is not increased more than necessary, so that the driving torque can be reduced, the vane tip can be prevented from being worn, and the noise can be prevented.

In the above embodiment, the communication hole 30 is provided only in the oil distribution path 14 of the rear side block 3, but it may be provided in the oil distribution path 15 of the front side block 2 as well. In this case, a variable capacity gas compressor may be provided by interposing a control plate for varying the capacity of the compression work chamber between the front side block 2 and the cylinder block 1.

<Effect> In the gas compressor according to the present invention, as described above, the communication hole is formed in one or both of the side blocks independently of the flat groove, and at one end of the communication hole, the tip of the vane is the discharge hole. Since it opened immediately after passing through and the other end opened to the space side, when high pressure was generated in the vane groove immediately after the vane tip passed through the discharge hole during high speed rotation of the rotor, this high pressure communicated. Since it is sufficiently discharged into the space through the holes, and as a result, the appropriate vane pressure is applied to the vanes, the rotation torque of the rotor can be reduced and the vane tip wear and noise are prevented. it can.

[Brief description of drawings]

1 is a side sectional view showing a gas compressor according to the present invention, FIG. 2 is a plan view of a rear side block of the same gas compressor, FIG. 3 is a side sectional view of a conventional gas compressor, and FIG. It is a top view which shows the conventional rear side block. 1 …… Cylinder block 2 …… Front side flock 3 …… Rear side block 4 …… Vane groove 5 …… Vane 6 …… Rotor 8 …… Lubricating oil 9 …… Casing 14,15,16 …… Oil distribution path 19a, 19b, 20a, 20b …… Sweeping groove 30 …… Communication hole a …… Gas compressor body

Claims (1)

[Scope of utility model registration request] 1. A cylinder block, which is provided between a front side and a rear side block and has a substantially elliptic cylindrical shape on the inner circumference, a cylinder chamber formed by the cylinder block and the both side blocks, and a laterally rotatable side in the cylinder chamber. A rotor that has a plurality of vanes that are bridged and that can move back and forth in a plurality of vane grooves that are provided in the radial direction; and a space portion that stores lubricating oil under discharge pressure at the rear portion of the rear side block, and A casing enclosing both sides and a cylinder block, and a plurality of flat grooves are formed on the rotor side of one or both of the side blocks at positions facing the vane grooves, and the lubricating oil is applied to a rotor shaft portion of the rotor. The lubricating oil that has been reduced in pressure through it is supplied to the sweep groove, and when the vane groove and the sweep groove communicate with each other, the pressure in the sweep groove is reduced. In the gas compressor configured to supply the vane pressure by supplying the generated lubricating oil to the vane groove, the vane groove is formed in the one or both side blocks independently of the sweep groove, and the vane groove is One end is opened so as to face the vane groove immediately after the tip of the vane passes through the discharge hole in the closed section of the vane groove until it separates from the other sifting groove and reaches the next sifting groove, and the other end is the space. A gas compressor characterized by being provided with a communication hole which is opened toward the space side and releases the pressure in the vane groove to the space side immediately after the vane tip passes through the discharge hole.