JPH0121359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vane-type rotary compressor that is suitable for use in compressing refrigerant gas in air-conditioning equipment, and particularly relates to a vane-type rotary compressor that is suitable for use in compressing refrigerant gas in air-conditioning devices, and in particular, it relates to a vane-type rotary compressor that is suitable for use in compressing refrigerant gas in air-conditioning equipment. This makes it possible to improve the durability of the shaft seal that is stopped.

BACKGROUND ART A vane type rotary compressor generally includes a rotating shaft 1, a rotor 2 rotated via the rotating shaft 1, and a rotor 2 that is attached to the rotor 2 so as to be freely protrusive and retractable approximately in a radial direction, as shown in FIGS. A large number of vanes 3...3
, a cam ring 4 housing the rotor 2 to which these vanes 3...3 are attached, and this cam ring 4.
A pump chamber 5 is formed on the inner periphery of the cam ring 4 by sandwiching the cam ring 4, and the front and rear side plates 6, 7 which support the rotating shaft 1, and these side plates 6, 7 and the rotor 2 are accommodated. A shaft seal housing chamber 8a provided in the housing 8 and outside the front side plate 6; When the rotor 2 rotates, the vanes 3...3 attached to the rotor 2 slide while being pressed against the inner peripheral surface of the cam ring 4, and each vane at that time 3,3
Due to the change in volume between the two, working gas (refrigerant gas) is introduced from the suction hole S into the pump chamber 5 via the suction chamber 10 and the suction passage 10a connected thereto, pressurized, and then passed through the discharge hole D through the discharge chamber 11. At the same time, the lubricating oil 13 in the oil reservoir 12 connected to the discharge chamber 11 is delivered to the rear side through the oil passage 14 provided in the rear side plate 7 by the gas discharge pressure. After guiding the rotary shaft 1 of the plate 7 to the part where it is supported for lubrication, it is supplied to the bottom part 2b of the vane receiving hole 2a...2a of the rotor 2 through the bearing clearance etc., and the vane 3...3 is provided with a predetermined back. Pressure is applied, and this back pressure presses the vanes 3...3 against the inner peripheral surface of the cam ring 4. The oil passage 15 is provided in the rotary shaft 1 and the rotor 2 in order to supply the oil 13 in the oil reservoir 12 to the bearing clearance between the front side plate 6 and the rotary shaft 1.

Problems to be Solved by the Invention By the way, as shown in FIG. 1, in the conventional vane type rotary compressor, an oil supply hole 16 to the shaft seal 9 is provided in the axial direction of the front side plate 6. One end side of this oil supply hole 16 is opened to the bottom part 2b of the vane receiving hole 2a...2a, and the other end side is opened to the shaft seal storage chamber 8a, so that the oil applied with the vane back pressure is directly transferred to the shaft seal storage chamber. 8a to lubricate the shaft seal 9 in the shaft seal storage chamber 8a, there were problems as described below.

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

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

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a compressor that can improve the durability of the shaft seal and improve the sealing performance.

Means for Solving the Problems A rotating shaft, a rotor rotated via the rotating shaft, a plurality of vane receiving holes extending substantially radially from the inside of the rotor and opening on an outer peripheral surface; A vane retractably attached to a vane receiving hole, a cam ring accommodating a rotor to which the vane is attached, and a pump chamber formed on the inner periphery of the cam ring by sandwiching the cam ring;
A pair of front side and rear side plates provided with bearings for the rotating shaft, a housing housing the side plates or the rotor, and a bearing provided on the front side plate are in communication with each other. The housing includes a shaft seal housing chamber provided in the housing, and a shaft seal disposed within the shaft seal housing chamber to seal between the housing and the rotating shaft, and is attached to the rotor when the rotor is rotated. The vanes sliding are pressed against the inner circumferential surface of the cam ring, and the volume change between the vanes at that time causes the working gas to flow from the suction hole into the pump chamber through the suction chamber and the suction passage connected thereto. The oil in the oil reservoir connected to the discharge chamber is supplied to the bottom of the vane receiving hole of the rotor by gas discharge pressure to apply vane back pressure. In the vane type rotary compressor, the shaft seal accommodating chamber is formed in the housing so as to surround the shaft seal, and the housing has a communication hole connecting the suction chamber and the shaft seal accommodating chamber. a shaft seal provided substantially above the shaft seal housing chamber so as to face the suction hole, and between the bearing of the rotating shaft of the front side plate and the bottom of the vane receiving hole to isolate the gap between the two; was interposed.

Function: Since the communication hole connecting the suction chamber and the shaft seal housing chamber is provided almost above the shaft seal housing chamber, low pressure oil from the suction chamber side is introduced into the shaft seal housing chamber, and the oil accumulates inside the shaft seal housing chamber. Maintains the amount of oil necessary for lubrication of shaft seals and bearings.

In addition, since a shaft seal is interposed between the bearing of the rotating shaft of the front side plate and the bottom of the vane receiving hole, the bottom of the vane receiving hole and the shaft seal housing chamber are almost completely isolated ( sealed),
Prevents pressure on the discharge side from acting on the shaft seal.

Embodiment Next, a vane type rotary compressor of the present invention will be explained with reference to the drawings.

As shown in FIG. 3, the vane type rotary compressor of the present invention has a plurality of vane receiving holes 2a extending approximately radially from the inside of a rotor 2 rotated by a rotating shaft 1 and opening on the outer circumferential surface. 2a, and the vanes 3...3 are attached to these vane receiving holes 2a...2a so as to be freely retractable and accommodated in the cam ring 4.
In order to form a pump chamber 5 on the inner periphery of the pump chamber 5, its both sides (front side and rear side) are sandwiched between a front side plate 6 and a rear side plate 7, and these front side and rear side plates 6, Bearing holes are provided in each of 7, and bearings (needle bearings) 21 and 24 are attached to the rotating shaft 1.
The side plates 6, 7 and the rotor 2 are housed in a housing 8, with both ends of the rotor 2 rotatably supported.

Further, a shaft seal housing chamber 8a is provided in the housing 8 so as to surround the shaft seal 9 and communicate with the bearing hole and the bearing (needle bearing) 21 provided in the front side plate 6, The shaft seal 9 seals between the bearing portion 8b of the housing 8 and the rotating shaft 1.

Then, the vanes 3...3 that rotate the rotor 2 slide while being pressed against the inner peripheral surface of the cam ring 4, and the working gas is sucked in from the suction hole S by the volume change between each vane 3 at that time. Pump chamber 5 via chamber 10 and suction passage 10a connected thereto.
The oil in the oil reservoir 12 connected to the discharge chamber 11 is supplied to the bottom of the vane receiving holes 2a...2a by the gas discharge pressure, and the vane back is discharged through the discharge chamber 11. It's starting to put pressure on me.

Further, the housing 4 is provided with a shaft seal housing chamber 8a such that a communication hole 17 that connects the suction chamber 10 and the shaft seal housing chamber 8a faces the suction hole S.
and a shaft seal 22 is installed between the bearing 21 installed in the bearing hole of the front side plate 6 and the bottom of the vane receiving hole 2a...2a, The bottom of the vane receiving hole 2a...2a and the shaft seal storage chamber 8
It is cut off from a.

In the embodiment, the communication hole 17 connects the bottom surface of the suction chamber 10 and the shaft seal housing chamber 8 directly below the suction hole S.
It is formed by penetrating the upper surface of a. Further, a strainer 18 is installed in the suction chamber 10, and the strainer 18 enables the necessary lubricating oil to be separated more efficiently than the lubricating oil circulating in the cooling cycle circuit (not shown). In this embodiment, the refrigerant gas led from the suction hole S to the suction chamber 10 is entrained in the refrigerant gas when the direction is changed at a substantially right angle and led into the pump chamber 5 through the suction passage 10a. Most of the lubricating oil mist drops go straight to the communication hole 17 due to their large mass, and the remaining oil passes through the strainer 18 and is screened by the mesh, and then flows through the communication hole 17 into the shaft seal housing chamber. It is designed so that it can be dropped into the container 8a.

A so-called mechanical seal is used for the shaft seal 9, and the shaft seal 9 includes a seat ring 9a, a retainer 9b, a seal ring 9c,
It consists of an O-ring 9d, a spring seat 9e, and a spring 9f. The seat ring 9a is fixed to the shaft seal accommodating chamber 8a of the housing 8, and a seal ring 9c made of carbon is slidably fitted to the retainer 9b. An O-ring 9d seals between the seal ring 9c and the rotating shaft 1.
Additionally, a spring seat 9e holds the O-ring 9d and the seal ring 9c, and a spring 9f is attached between the spring seat 9e and the inner peripheral surface of the retainer 9b.
So, this spring 9f is a spring seat 9e.
The tip of the seal ring 9c is crimped onto the seal ring 9a via an O-ring 9d.

Since the vane-type rotary compressor of this embodiment has the above-described configuration, the low-temperature, low-pressure oil separated from the low-temperature, low-pressure refrigerant expanded gas introduced into the suction chamber 10 is transferred to the shaft through the communication hole 17. It is introduced into the seal storage chamber 8a and stored therein, and effectively lubricates the shaft seal 9 and the bearing (needle bearing) 21. On the other hand, the high temperature and high pressure oil 13 in the oil reservoir 12 is transferred to the oil passage 14 and the oil passage 15.
It is supplied to the bearing (needle bearing) 23 and various rotating and sliding parts through the lubrication system. Since the bottom of the vane receiving hole 2a and the shaft seal housing chamber 8a are sealed with the shaft seal 22 as described above, high temperature and high pressure oil is not introduced into the shaft seal housing chamber 8a. Only low-temperature, low-pressure oil on the suction side is introduced, and the shaft seal 9 is protected from high-temperature, high-pressure oil. In addition, this compressor can isolate the bottom of the vane receiving hole 2a and the shaft seal storage chamber 8a with the shaft seal 22, and even when the oil is under high pressure, the sealing performance of the shaft seal can be maintained. It is designed so that it can be improved. A bearing (needle bearing) 23 and an aperture ring 24 are attached between the rear side plate 7 and the rotating shaft 1. In the embodiment shown in the drawings, a mechanical seal is used as the shaft seal, but the shaft seal may be a lip seal in which a lip portion contacts the outer periphery of the shaft.

Effects of the Invention As explained above, the vane type rotary compressor of the present invention has a communication hole that connects the suction chamber and the shaft seal housing chamber in the housing, which is provided substantially above the shaft seal housing chamber so as to face the suction hole. Since a shaft seal is provided between the shaft bearing of the rotating shaft of the front side plate and the bottom of the vane receiving hole, the following effects can be obtained.

(1) A shaft seal is interposed between the front side bearing and the bottom of the vane receiving hole formed inside the rotor, so the high temperature lubricating oil in the vane receiving hole flows into the bearing and shaft seal housing chamber. There will be no intrusion.

(2) A shaft seal housing chamber provided in the housing that communicates with the bearing provided on the front side plate is formed to surround the shaft seal, and communicates the shaft seal housing chamber with the suction chamber. Since the communication hole is provided substantially above the shaft seal housing chamber so as to face the suction hole, the lubricating oil separated from the low-temperature, low-pressure refrigerant containing lubricating oil that has returned to the suction chamber from the suction hole can pass through the communication hole. The lubricating oil reaches the shaft seal housing chamber, and due to the cooperation between the structure of the shaft seal housing chamber and the shaft seal, the lubricating oil is stored in the shaft seal housing chamber so as to immerse the shaft seal and the bearing.

(3) Due to (1) and (2) above, the shaft seal and bearing are always lubricated with low-temperature, low-pressure lubricating oil, so there is no deterioration in durability or poor lubrication due to heat.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional vane type rotary compressor, Figure 1 is a cross-sectional view taken along the line - - in Figure 2, Figure 2 is a cross-sectional view taken along the line - - in Figure 1, and Figure 3 shows the vane of the present invention. FIG. 2 is a cross-sectional view of a die rotary compressor. 1... Rotating shaft, 2... Rotor, 2a... Vane receiving hole, 3... Vane, 4... Cam ring, 5...
Pump chamber, 6, 7...Side plate, 8...Housing, 8a...Shaft seal storage chamber, 9...
...Shaft seal, 10...Suction chamber, 10a...
Suction passage, 11...Discharge chamber, 12...Oil reservoir, 13...Oil, 17...Communication hole, 18...
Strainer, 21... Bearing (needle bearing), 22... Shaft seal, S... Suction hole, D...
...Discharge hole.

Claims (1)

[Claims] 1. A rotating shaft, a rotor rotated via the rotating shaft, a plurality of vane receiving holes extending substantially radially from the inside of the rotor and opening to the outer peripheral surface, and a plurality of vane receiving holes that are freely retractable into and retractable from the vane receiving holes. a pair of vanes attached to the vane, a cam ring accommodating a rotor to which the vane is attached, a pump chamber sandwiching the cam ring to form a pump chamber on the inner periphery of the cam ring, and a bearing for the rotating shaft; a front side and a rear side plate, and a housing that accommodates these side plates or the rotor;
a shaft seal housing chamber provided in the housing in communication with a bearing provided on the front side plate; and a shaft disposed within the shaft seal housing chamber for sealing between the housing and the rotating shaft. When the rotor is rotated, the vanes attached to the rotor slide while being pressed against the inner peripheral surface of the cam ring, and the volume change between the vanes at that time causes the working gas to be released. Introduced into the pump chamber from the suction hole through the suction chamber and the suction passage connected thereto,
The oil is pressurized and discharged to the outside through a discharge chamber, and the oil in the oil reservoir connected to the discharge chamber is supplied to the bottom of the rotor's vane receiving hole by gas discharge pressure to apply vane back pressure. In the vane type rotary compressor, the shaft seal storage chamber is formed in a housing so as to surround the shaft seal, and the housing has a communication hole connecting the suction chamber and the shaft seal storage chamber to the suction hole. A shaft seal is provided substantially above the shaft seal housing chamber so as to face each other, and a shaft seal is interposed between the bearing of the rotating shaft of the front side plate and the bottom of the vane receiving hole, 1. A vane-type rotary compressor, characterized in that a bottom portion of the shaft seal housing chamber is isolated from the shaft seal storage chamber.