JPH056034B2 - - 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. It is related to improving the lubricity of

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 is composed of a cylinder 3, a roller 4, a main bearing 5, a sub-bearing 6, a gate valve 7, and compression springs 7a and 7b that press the gate valve. The mechanical part main body 8 is fixed. The gate valve 7 is connected to the cylinder 3
It is held in the gate valve groove 3a and the gate valve hole 3b. Inside the cylinder 3, a main bearing 5 and a sub-bearing 6 form a cylinder chamber 9. The main bearing 5 and the sub-bearing 6 rotatably support 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 the eccentric cam 11 is provided with a ring-shaped roller 4.
is mounted on the shaft.

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.
The rotation of the roller 4 and the eccentric cam 11 compresses the refrigerant by rotationally driving the roller 4 in the cylinder chamber 9, 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. 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. In addition, at the maximum load, the concentrated load B applied near the ridge line 18 is
This is approximately five times the concentrated load C applied to the vicinity. In this case, the oil groove 14a and the oil groove 14b are the through hole 1 of the main bearing 5.
The lubricating oil dripping from the gate valve 5 is supplied to the side surface of the gate valve 7, and plays the role of reducing the concentrated loads B and C. This has the drawback that wear increases due to lack of lubrication in the vicinity of the wire 19, and in the worst case, the mechanical part main body 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-feeds it to the side wall near the inner circumference of the cylinder on the suction hole side of the gate valve. The purpose of this is to prevent wear caused by one side sliding of the gate valve by improving the lubricity between the valves and reducing the load.

Structure of the Invention The present invention provides a gate valve forming a pump chamber, a gate valve groove, a main bearing, and a sub-bearing, one or both of which have one end communicating with an oil sump and the other end communicating with an oil sump. An oil inflow hole is provided that opens into the pump chamber and is opened and closed by a gate valve, and one end opens into the pump chamber and the other end opens near the inner surface of the cylinder on the side wall surface of the suction hole of the gate valve groove. It is equipped with a communication hole.

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

Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted. 7a and 7b are compression springs, one end of which is connected to a locking portion 20 projecting above and below the gate valve 20.
a and 20b, and the other end is in contact with the inner wall of the sealed casing 1. Also, the locking parts 20a, 20
b is the hole 2 provided in the main bearing 21 and the sub-bearing 22.
3. Reciprocate within the hole 24. 26 is the gate valve 20, the gate valve groove 25 of the cylinder 3, and the main bearing 2
1. A pump chamber formed by the sub bearing 22 and in which the gate valve itself acts as a piston; this pump chamber 26 includes an oil reservoir 27 provided in the sub bearing 22;
An oil inlet hole 28 communicating with is open. This oil inflow hole 28 opens into the pump chamber 26 only while the roller 4 is rotating on the side opposite to the gate valve 20 (rotation angle θ≈180° of the roller 4 with respect to the gate valve 20). The lubricating oil pressure-fed within the pump chamber 26 passes through the communication hole 29, which is opened 29a at a position near the inner circumference of the cylinder 3 that does not communicate with the suction hole 12 on the suction hole 12 side of the gate valve groove 25. Supplied. 30a and 30b are oil grooves 30 formed in the gate valve groove 25.

In the above configuration, as the roller 4 rotates, the gate valve 20 reciprocates against the compression springs 7a and 7b. When the gate valve 20 slides toward the center of the cylinder 3, the pressure inside the pump chamber 26 drops below the pressure inside the sealed casing 1, and therefore the oil inflow hole 2
8 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 26. Then, as the roller 4 continues to rotate and the gate valve 20 approaches the position where the pressure in the cylinder chamber 9 rises and the load A due to gas pressure reaches its maximum value, the gate valve 20 closes the oil inlet hole 28, and then the pump The lubricating oil within chamber 26 is pressurized.

As a result, as the roller 4 rotates, the cylinder chamber 9
becomes high pressure, and the concentrated load B and the concentrated load C acting on the ridge line 18 of the gate valve groove 25 and the contact portion 31 with the rear end of the gate valve 20 reach a peak point at the rotation angle θ of the roller 4 = 190~ At around 250°, lubricating oil is supplied from the opening 29a to the vicinity of the ridge line 18 through the communication hole 29, and the hydraulic pressure acts in the direction of reducing the gas pressure load A. Therefore, the concentrated load B becomes the concentrated load B. ′,
The concentrated load C is respectively reduced to a concentrated load C'.
Further, lubricating oil flows into the oil grooves 30a and 30b as in the conventional case, and lubricates the gate valve groove 25.

Therefore, lubricating oil is forcibly supplied to the ridge line 18 of the gate valve 20 and the gate valve groove 25, where the concentrated load is particularly large, and the concentrated load can be reduced, preventing seizure due to wear and increasing reliability. Improves sex.

Although a vertical type compressor has been described above, the same effect can be obtained by opening the oil inlet hole 28 in one or both of the horizontal type compressors.

Effects of the Invention As is clear from the above description, the present invention has a gate valve, a main bearing, and a sub-bearing that communicate with the gate valve groove to form a pump chamber, and the sub-bearing, the main bearing, or both. One end communicates with the oil reservoir, the other end opens into the pump chamber, and an oil inlet hole is provided which is opened and closed by a gate valve, and one end communicates with the pump chamber,
Since the other end is the side wall of the gate valve groove and has a communication hole that opens near the inner surface of the cylinder on the suction hole side, the lubricating oil is pressurized using the reciprocating sliding motion of the gate valve, and the gate valve The lubricating oil is pumped near the pressure receiving point of the gate valve groove at the rotation angle position of the roller where the largest concentrated load is applied to the gate valve groove, thereby preventing wear on the gate valve by improving lubricity and reducing concentrated load. It is possible to improve reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional rotary compressor;
2 is a sectional view taken along the line -' in FIG. 1, FIG. 3 is an enlarged view of a conventional gate valve, and FIG. 5
This figure is a sectional view taken along the line -' in FIG. 4, and FIG. 6 is an enlarged view of the gate valve section in FIG. 5. 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 provided in a gate valve groove formed in the cylinder so as to be able to elastically contact the outer circumferential surface of the roller and slide back and forth, and both ends of the gate valve. a pump chamber defined by a suction hole and a discharge port communicating with the cylinder, the gate valve, the gate valve groove, a main bearing, and a sub-bearing, one of the main bearing or the sub-bearing; or both are provided with an oil inlet hole that communicates with the oil reservoir at one end and opens into the pump chamber at the other end and is opened and closed by the gate valve, and one end opens into the pump chamber and the other end opens into the partition. A rotary compressor comprising a communication hole that opens on a side wall surface of the suction hole of the valve groove and near the inner surface of the cylinder.