JPS59115490A - Vane type rotary compressor - Google Patents

Abstract

PURPOSE:To lead low pressure oil into a mechanical seal holding chamber and thereby aim at a distinct improvement in seal properties, by installing an interconnecting hole, which links a suction chamber with the mechanical seal holding chamber, in a housing and also installing a shaft seal in a part which pivotally supports a rotation shaft of a side plate at the front side. CONSTITUTION:A housing 8 is provided with an interconnecting hole 17 linking a mechanical seal holding chamber 8a, while a shaft seal 19 is installed in a part that pivotally supports a rotation shaft 1 of a side plate 7 at the front side. With this constitution, since low pressure oil at the side of a suction chamber 10 is led into the mechanical seal holding chamber 8a, the seal effect of a mechanical seal 9 is in no case killed by high pressure as in the past and also durability of the mechanical seal will not be impaired at all, thus the mechanical seal 9 can be protected from high temperature and high pressure oil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vane-type rotary compressor that is suitable for compressing refrigerant gas in air-conditioning equipment, and in particular to a mechanical seal that seals between a rotating shaft and a housing. This makes it possible to improve the durability of the

A vane type rotary compressor generally includes a rotating shaft 1, a rotor 2 rotated via the rotating shaft 1, as shown in Fig. 1.2.
A large number of vanes 3...3 are attached to the rotor 2 so as to be freely protrusive and retractable approximately in the radial direction, a cam ring 4 that accommodates the rotor 2 with the vanes 3... A pump chamber 5 is formed on the inner periphery of the cam ring 4, and front and rear side plates 6.7 support the rotating shaft 1, and these side plates 6.7.
A housing 8 that accommodates the rotor 2, and a mechanical seal 9 installed in the housing 8 that seals the rotating shaft, and a mechanical seal 9 that is attached to the housing 8 and seals the rotating shaft. When the vanes 3 and 3 attached to the rotor 2 are pressed against the inner peripheral surface of the cam ring 4, they slide, and the volume change between the vanes 3 and 3 causes the working gas (
Refrigerant gas) is introduced into the pump chamber 5 from the suction hole S through the suction chamber 10 and the suction passage 10a connected thereto, pressurized, and then passed through the discharge chamber 11 from the discharge hole to the cooling cycle circuit (not shown). The lubricating oil J3 in the oil reservoir 12 connected to the discharge chamber 11 is discharged through the oil passage 14 provided in the rear side plate 7 by the gas discharge pressure, and the rotating shaft 1 of the rear side plate 7 is supported by the shaft. It is supplied to the bottom groove 2b of the vane receiving hole 2a...2a of the rotor 2 through a balance etc., and a predetermined back pressure is applied to the vane 3...3.
The vanes 3...3 are pressed against the inner peripheral surface of the cam ring 4 by this back pressure. Note that 15 is the oil reservoir 12
This is an oil passage provided in the rotating shaft 1 and the rotor 2 to supply oil 13 to the bearing clearance between the front side plate 6 and the rotating shaft 1.

In the conventional vane type rotary compressor, as shown in FIG. 1, an oil supply hole 16 to the mechanical seal 9 is provided in the axial direction of the front side plate 6. One end side of the vane receiving hole 2a...2
A is opened into the bottom groove 2b of the mechanical seal housing WBa, and the other end is opened into the mechanical seal housing chamber 8a, and the oil applied with the vane back pressure is supplied as it is to the mechanical seal housing chamber 8a, and the mechanical seal inside the mechanical seal housing WBa is opened. Since the seal 9 was configured to be lubricated, there were drawbacks as described below.

(1) Lubricating oil pressurized by the discharged gas is introduced into the mechanical seal storage chamber 8a and the pressure becomes high, so that the sealing effect of the mechanical seal 9 is impaired.

(2) Since high temperature oil is supplied into the mechanical seal storage chamber 8a, the durability of the mechanical seal 9 is impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor which eliminates the drawbacks of the conventional method and which does not impair the sealing effect or durability of the mechanical seal. A small amount of lubricating oil is included in the form of a mist, and this was created with the focus on using this oil to lubricate mechanical seals.The main structure is shown in the drawings in Figure 3 and below. As shown in the housing 8,
A communication hole 17 is provided to connect the suction chamber 10 and the mechanical seal storage chamber 8a, and the oil in the suction chamber 111, which has a lower pressure and lower temperature than the discharge chamber side, is transferred to the mechanical seal storage chamber 8b through the branch hole 17. The reason is that we decided to supply it.

In the first embodiment shown in FIG. 3, the communication hole 17 is preferably formed directly below the suction hole S by penetrating the lower surface of the suction chamber 10 and the upper surface of the mechanical seal housing chamber 8b. In addition, a strainer 18 is provided in the suction chamber 10.
The lubricating oil entrained in the expanded refrigerant gas that circulates in the cooling cycle circuit (not shown) and is led into the suction chamber 10 can be efficiently separated. That is, when the refrigerant gas led from the suction hole S to the suction chamber 10 changes direction approximately at right angles and is led into the pump chamber 5 through the suction passage 10, the lubricant entrained in the refrigerant gas is removed. Most of the oil mist drops go straight to the communication hole 17 due to their large mass, and the rest of the oil goes straight through the strainer 1.
When passing through 8, it is attached to and separated from the mesh, and the communication hole 17
It is adapted to be introduced dropwise into the mechanical seal housing chamber 8a. 19 is the front side plate 6
and the rotating shaft 1, and the oil supply hole 16
and a shaft seal 20 which suppresses the end face of the shaft seal 19 to prevent oil from the high-pressure, high-temperature discharge chamber side from flowing into the mechanical seal storage chamber 8a from the bearing clearance. This is a seal holding plate.

The mechanical seal 9 also includes a bearing portion 8 of the housing 8.
A seat ring 9a fixed to the road, a cylindrical retainer 9b fixed to the rotating shaft 1, a carbon seal ring 9C slidably fitted to the retainer 9b, and the seal ring 9C and the rotating shaft 1. O-ring 9d sealing between
, a spring seat 9θ which holds the O-ring 9d between the seal ring 9C, a spring seat 9θ which is attached between the spring seat 9θ and the inner circumferential surface of the retainer 9b, and a spring 9f which presses the tip of the seal ring 9C to the seat ring 9a via a spring 9d.

Since the vane type rotary compressor of the first embodiment has the above-described configuration, the low-pressure, low-temperature oil separated from the low-pressure, low-temperature refrigerant expanded gas led to the suction chamber 10 is transported through the communication hole 17. is introduced into the mechanical housing chamber 8a, and effectively lubricates the mechanical seal 9. On the other hand, the high-pressure, high-temperature oil 13 in the oil reservoir 12 is supplied to the oil supply hole 16 via the oil passage 14, the bearing clearance, and the bottom groove 2b of the vane receiving hole 2a...2a, or the oil passage 14,
is supplied to the bearing clearance via the oil passage 15,
Lubrication of each rotating and sliding part is the same as described above, but since the oil supply hole 16 and the end of the bearing clearance of the front side plate are sealed with the shaft seal 19 as described above, high pressure and high temperature can be avoided. No oil is introduced into the mechanical seal housing chamber 8a, and only the low-pressure, low-temperature oil on the suction side is introduced, and the mechanical seal 9 is protected from the sub-pressure and high-temperature oil.

FIG. 4 shows a second embodiment of the present invention, in which a needle bearing 21 and a shaft seal 22 are installed between the front side plate 6 and the rotating shaft 1, and the needle bearing 21 is inserted into the suction chamber. 10 side oil, R1”
This shows a case in which lubrication is carried out with oil introduced into the mechanical seal storage chamber 8a, and in this embodiment, the oil 13 in the oil reservoir 12 is supplied between the front side plate 6 and the rotating shaft 1. oil passage (first
．． 3) and the oil supply hole path (ml, the oil supply hole rim indicated by number 16 in FIG. 3) can be made unnecessary.

Note that 23 and 24 are the side plate 7 on the rear side 1 and the rotation #
] The needle bearing and the aperture ring are housed between 1 and 1. Note that parts that are the same as those in the prior art are designated by the same reference numerals and redundant explanations will be omitted.

As explained above, the present invention includes a rotating shaft, a rotor that is rotated via the rotating shaft, a large number of vanes that are attached to the rotor so as to be freely retractable in a substantially radial direction, and a rotor that houses the vanes. a cam ring that holds the cam ring, and a pump chamber that is formed on the inner periphery of the cam ring by sandwiching the cam ring;
A pair of front and rear side plates that support the rotating shaft, a housing that accommodates these side plates or the rotor, and a mechanical seal that is attached to a housing chamber provided in the housing to seal the rotating shaft. When the rotor rotates, the vanes attached to the rotor are not pressed against the inner peripheral surface of the cam ring, so they slide. I-5 Volume change between each vane at that time Introduces the working gas into the pump chamber through the suction chamber and the suction passage connected to it,
The oil is pressurized and discharged to the outside through the discharge chamber, and the oil in the oil reservoir connected to the discharge chamber is supplied to the bottom of the vane receiving hole of the rotor using gas discharge pressure to apply vane back pressure. In the vane type rotary compressor, the housing is provided with a communication hole that connects the suction chamber and the mechanical seal housing chamber, and the front side plate is provided with a shaft seal in the portion that supports the rotating shaft, which will be described next. There is a similar effect.

(1) Since low-pressure oil from the suction chamber side is introduced into the mechanical seal storage chamber, the sole effect of the mechanical seal is not diminished by high pressure, unlike in the conventional case.

(2) Since low-temperature oil from the suction chamber side is introduced into the mechanical seal storage chamber, the durability of the mechanical seal is not impaired by heat.

[Brief explanation of the drawing]

Fig. 1.2 shows a conventional vane type rotary compressor, Fig. 1 is a sectional view taken along line I-1 in Fig. 2, Fig. 2 is a sectional view taken along line ■-■ in Fig. 1, and Fig. 3 is a sectional view taken along line I-1 in Fig. A sectional view of the vane type rotary compressor of the present invention, and FIG. 4 is a sectional view of another embodiment. 1... Rotating shaft, 2... Rotor, 2a... Vane receiving hole, 3... Vane, 4... Cam ring, 5... Bonn 7"
Chamber, 6°7...Zide plate, 8-Housing, 8a
... Mechanical seal gM, 9. Mechanical seal, 10.. Suction chamber, lOa... Suction passage, 11..
Discharge chamber, 12... Oil reservoir, 13 - Oil, 17
...Communication hole, 18...Strainer, 19 - Shaft seal, S...Suction hole, D...Discharge hole.

Claims (1)

[Claims] (1) A rotating shaft, a rotor that is rotated via the rotating shaft, a number of vanes that are attached to the rotor so as to be able to protrude and retract in a substantially radial direction, a cam ring that accommodates the rotor with the vanes attached, and a cam ring. A pump chamber is formed on the inner periphery of the cam ring by sandwiching the rotor, a pair of front side and rear side plates bearing the rotating shaft, a housing housing the side plates or the rotor, and a housing. A mechanical seal is installed in a provided mechanical seal storage chamber and seals the rotating shaft, and when the rotor is rotated, the base attached to the rotor is pressed against the inner circumference of the cam ring. The pump slides while being held in place, and the working gas is introduced from the suction hole into the pump chamber through the suction chamber and the suction passage connected thereto by the volume change between each vane at that time;
J11 pressure and discharged to the outside through the discharge chamber, and the oil in the oil reservoir connected to the discharge chamber is supplied to the bottom of the vane receiving hole of the rotor using the gas discharge pressure to apply vane back pressure. In the vane type rotary compressor, the housing is provided with a communication hole that connects the suction chamber and the mechanical seal storage chamber, and a shaft seal is provided in the portion of the front side plate that supports the rotation shaft. A vane type rotary compressor characterized by: C) The communication hole is provided directly below the suction hole.