JPH056033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in a refrigeration cycle, etc., and in particular to a gate valve groove in which a gate valve that divides the inside of the cylinder into high and low pressure chambers is housed. Related to wear prevention.

Conventional configuration and its problems The conventional configuration will be explained with reference to FIGS. 1, 2, and 3. 1 is a sealed casing, 2 is an electric motor section, and the lower part thereof includes a cylinder 3, a roller 4, a main bearing 5, an auxiliary bearing 6, a gate valve 7, and compression springs 7a, 7b.
A mechanical part main body 8 made up of is fixed. The gate valve 7 has a gate valve groove 3a in the cylinder 3,
It is held within the gate valve hole 3b.

Inside the cylinder 3, a main bearing 5 and a sub-bearing 6 form a cylinder chamber 9. Main bearing 5, sub bearing 6
rotatably supports a shaft 10 connected to the electric motor section 2. This shaft 10 is provided with an eccentric cam 11 located within the cylinder chamber 9, and a ring-shaped roller 4 is mounted on the eccentric cam 11.

A suction hole 12 and a discharge port 13 are provided on both sides of the gate valve groove 3a of the cylinder 3, respectively. Also,
Oil grooves 14a and 1 are provided on both sides of the gate valve groove 3a, respectively.
4b and an oil groove 14 on the discharge port 13 side.
a is located near the inner surface of the cylinder 3, and the oil groove 14b on the suction hole 12 side is located far from the inner surface of the cylinder 3. The main bearing 5 and the sub-bearing 6 have a through hole 15 and a through hole 16, respectively, which communicate with the oil groove 14a and the oil groove 14b.

Therefore, the refrigerant sucked into the cylinder chamber 9 through the suction hole 12 is transferred to the shaft 1 as the electric motor section 2 rotates.
0 and the eccentric cam 11, the roller 4 rotates in the cylinder chamber 9 to compress the refrigerant, and the compressed refrigerant is once discharged into the sealed casing 1 from the discharge port 13, and then from the discharge pipe 17. discharged into the system.

In the conventional structure described above, when the cylinder chamber 9 becomes high pressure due to the rotation of the roller 4, the gate valve 7 receives the gas pressure indicated by the arrow A, so that the gate valve 7 is located on the inner diameter side of the cylinder 3 and on the suction hole 12 side of the gate valve groove 3a. Ryo Line 18
It comes into contact and slides near the gate valve hole 3b side and near the ridge line 19 on the discharge port side, and the ridge line 1
A force indicated by arrow B is applied near ridge line 8, and a force indicated by arrow C is applied near ridge line 19 as a concentrated load. Note that the concentrated load B is approximately five times the concentrated load C. In this case, the oil grooves 14a and 14b serve to supply lubricating oil dripping from the through hole 15 of the main bearing 5 to the side surface of the gate valve 7, and also to reduce the concentrated loads B and C. As long as it acts as a gate valve groove 3
The wear of the portions near the ridge line 18 and the ridge line 19 in a is increased, and in the worst case, the mechanical part 8 may seize.

Purpose of the Invention The present invention utilizes the reciprocating sliding motion of the gate valve to pressurize lubricating oil and force-feed it to the side wall of the gate valve on the discharge port side, thereby pressing the gate valve against the side wall of the suction hole using hydraulic pressure. The purpose of this is to prevent the gate valve from tilting when the gate valve of the gate valve groove slides within the gate valve groove.

Structure of the Invention The present invention includes a gate valve that slides back and forth by an eccentrically rotating roller, a pump chamber operated by the gate valve, one end communicating with an oil reservoir, and the other end opening into the pump chamber. It has an oil inlet hole that is opened and closed by the gate valve, and a communication hole that has one end communicating with the pump chamber and the other end opening near the oil inlet hole and on the discharge port side wall surface of the gate valve groove, and the pump chamber is operated by the gate valve. The gate valve is pressed against the side wall of the suction hole using hydraulic pressure.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4, 5, and 6.

Incidentally, parts that are the same as those in the conventional example are given the same reference numerals, and explanations thereof will be omitted. a compression spring 7a that presses the gate valve 20;
One end of 7b is locked by locking portions 20a and 20b formed to protrude above and below the gate valve 20, and the other end is in contact with the inner wall of the sealed casing 1. Locking part 20
a and 20b perform reciprocating motion within holes 23 and 24 provided in the main bearing 21 and the sub-bearing 22. 26
is a pump chamber in which the gate valve 20 itself acts as a piston due to the gate valve 20, the gate valve groove 25 of the cylinder, the main bearing 21, and the sub bearing 22;
6 has an oil inlet hole 28 provided in the sub-bearing 22 and communicating with the oil reservoir 27 . This oil inlet hole 28 is located so that the roller 4 is on the side opposite to the gate valve 20 (the side opposite to the gate valve 20).
The pump chamber 26 is opened only while the roller 4 is rotating through a rotation angle θ≈180° with reference to zero. The oil pumped in the pump chamber 26 is delivered to the discharge hole 13 which is always closed by the gate valve 20 at the center in the height direction of the gate valve groove 25 through the communication hole 29 and which is as close to the oil inflow hole 28 in the radial direction as possible.
There are holes in the side wall. 30 is an oil groove 30 formed on the suction hole 12 side of the gate valve groove 25.

In the above configuration, the gate valve 20 makes a reciprocating sliding movement as the roller 4 rotates, but when the gate valve 20 slides toward the center of the cylinder 3, the pump chamber 2
6 becomes lower than the pressure in the sealed casing 1, and the oil inflow hole 28 opens into the pump chamber 26 by movement of the gate valve 20, the lubricating oil in the oil reservoir 27 flows into the pump chamber 27. Inflow. As the roller 4 continues to rotate and the pressure in the cylinder chamber 9 increases and the load A due to gas pressure approaches the maximum value, the gate valve 20 closes the oil inlet hole 28 and then the pump chamber 26 closes. The lubricating oil inside is pressurized. This pressurized oil reaches the suction hole 12 side of the gate valve 20 through the communication hole 29, and a load D is applied to press the gate valve. As a result, the load D overcomes the concentrated load C conventionally generated by the gas pressure A, and the gate valve 20
It will be pressed almost evenly against the side wall surface. That is, although the total contact load between the gate valve 20 and the gate valve groove 25 increases due to the generation of the load D, the concentrated load is considerably reduced because they are in even contact.

A portion of the lubricating oil sent to the communication hole 29 passes through the gate valve 2.
0 and the holes 23 and 24 through the gap between the gate valve groove 25
Then, the oil drips into the oil sump 27. In the oil groove 30,
As in the conventional case, lubricating oil flows in and lubricates the side wall surface of the suction hole 12 of the gate valve groove 25.

Therefore, the load between the gate valve 20 and the gate valve groove 25 is not a concentrated load but a substantially uniform uniform load.
Seizure due to wear due to one side of the gate valve can be prevented, improving reliability.

Effects of the Invention As is clear from the above description, the present invention forms a pump chamber in the gate valve groove in which the gate valve slides back and forth using a gate valve, a main bearing, and a sub-bearing, and an oil reservoir at one end of the sub-bearing. An oil inlet hole is provided, which is connected to the pump chamber at the other end and is opened and closed by the gate valve, and furthermore, one end is connected to the pump chamber and the other end is connected to the wall surface on the discharge port side of the gate valve groove. In addition, since it is equipped with a communication hole that opens near the oil inlet hole, the lubricating oil is pressurized using the reciprocating sliding movement of the gate valve and is forced to be fed to the side surface of the gate valve on the discharge port side.
Concentrated loads can be reduced, wear caused by one-sided sliding of the gate valve can be prevented, and seizing of mechanical parts and poor insulation of the motor can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional rotary compressor;
Fig. 2 is a sectional view taken along line -' in Fig. 1, Fig. 3 is an enlarged plan view of a conventional gate valve, and Fig. 4 is a
A sectional view of a rotary compressor showing an embodiment of the present invention,
5 is a sectional view taken along the line -' in FIG. 4, and FIG. 6 is an enlarged plan view of the gate valve section. 3...Cylinder, 4...Roller, 20...Gate valve, 26...Pump chamber, 28...Oil inflow hole, 29
...Communication hole.

Claims (1)

[Claims] 1 a cylinder, a roller that rotates eccentrically within the cylinder, a gate valve that is slidably reciprocated in a gate valve groove formed in the cylinder, and a roller that is provided on both sides of the gate valve and that is attached to the cylinder. A pump chamber defined by a suction hole and a discharge port that communicate with each other, the gate valve, the gate valve groove, a main bearing, and a sub-bearing, one end communicating with the oil reservoir and the other end opening into the pump chamber. an oil inflow hole that is open and closed by the gate valve; and a communication hole that has one end communicating with the pump chamber and the other end opening in the discharge port side wall surface of the gate valve groove and in the vicinity of the oil inflow hole. A rotary compressor equipped with