JPS62118088A - Enclosed scroll compressor - Google Patents

Abstract

PURPOSE:To prevent oil from decreasing by providing an eccentric hole which extends in the radial direction through a rotor part for a motor, on the top of said rotor part opposite to a lower bearing part, and positively discharging oil which flows out of said lower bearing part into the bottom part of a container by means of the centrifugal force of said eccentric hole. CONSTITUTION:Eccentric holes 26, 27 which extend in the radial direction through a rotor part 3b for a motor, are provided on the top of the rotor part 3b opposite to a lower bearing part 32, in order to efficiently discharge oil which flows out of the lower bearing part 32 positioned below a main bearing 31, into the bottom part 2c of a container. Thereby, since the oil can be positively discharged utilizing the action of the centrifugal force of the eccentric holes 26, 27, the decrease of oil in a compressor body can be lessened. As a result, the performance of the whole of a refrigeration cycle as well as the performance of a compressor can be improved. Also, the eccentric holes 26, 27 inside the rotor 3b can serve as a second balancing weight, thereby, enabling the compressor as a whole to be small and light. Furthermore, the discharged oil is helpful to improve the refrigerating effect for a motor.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a scroll type hermetic compressor used as a refrigerant compressor for refrigeration and air conditioning or a helium compressor, which has an oil separation function. It's about structure.

[Background of the invention]

In the conventional device, as described in Japanese Patent Application Laid-Open No. 58-188887, the refrigerant gas compressed by the scroll compression element passes through the outer circumference of the stator of the electric motor, and then oil is separated at the lower part of the chamber. It rises again through the outer periphery of the stator of the motor and reaches the upper part 9 of the motor chamber. In turn, it forms a gas flow path that is led to the outside via the discharge pipe. The lower bearing located below the main bearing is supplied with oil through an oil lift pipe at the lower end of the main shaft, mainly by the action of a centrifugal pump in a horizontal hole (oil supply hole) in the lower bearing. The oil supplied to this portion mainly flows downward through the bearing gap, and eventually reaches the upper surface of the motor rotor. Next, the oil is blown up between the upper parts 9 of the motor chamber by the rotational centrifugal force of the upper rotor end.

Therefore, the blown up oil turns into oil droplets and fills the upper space of the motor room, resulting in an increase in the amount of oil coming up from the compressor.

%, when the scroll compressor is driven by an inverter, the above-mentioned oil rising phenomenon becomes noticeable.

If the amount of oil coming out of the compressor increases, there is a risk that not only the reliability of the compressor itself but also the performance and reliability of the refrigeration cycle as a whole (for example, the heat transfer performance of the heat exchanger and the pressure loss of the piping will increase) will decrease. be.

[Purpose of the invention]

The present invention was made in view of the problem H/Cpl in L, and discloses the structure of a compressor that efficiently separates oil in a closed container and prevents oil from flowing out of the machine. The purpose of this invention is to provide a closed type electric pressure machine with improved performance.

[Summary of the invention]

In order to effectively discharge the oil flowing out from the lower bearing part located below the main bearing to the lower part of the container, the present invention has a diameter of 100 mm installed on the upper surface of the electric motor rotor part facing the lower bearing part. An eccentric hole extending in the direction is provided, and oil is drained in a dipping manner by utilizing the centrifugal force of the eccentric hole.

Furthermore, the eccentric hole provided in the motor rotor is set to function as a second balance weight to offset the centrifugal force of the orbiting scroll. The aim is to

[Actual example of the invention]

Embodiments of the present invention are shown below in FIGS. 1 to 8.

First, one embodiment shown in FIGS. 1 and 2 will be described.

In FIG. 1, a compressor section 100 is located above inside the closed container 1.
However, the electric motor section 8 is housed below. The inside of the closed container 1 is divided into an upper chamber 1a and a motor chamber 1b.

The EE compressor section 100 has a fixed scroll member 5 and an orbiting scroll member 6 that are combined together to form a compression chamber (sealed space) 7.Fixed scroll member 5!-j: Disk-shaped end plate 5a, and nine wraps 5b which stand upright thereon and are formed into an impoliud curve or a curve approximating this, and are provided with a discharge port 10 at the center and an inlet port 16 at the outer periphery.The orbiting scroll member 6 is It consists of a disk-shaped end plate 6a, a wrap 6b standing upright thereon and formed in the same shape as the wrap of the fixed scroll, and six bosses 6C formed on the opposite wrap surface of the cast plate.The frame 11 is located at the center. A bearing part is formed in the part, and the rotating shaft 14 is supported by this bearing part, and the eccentric shaft 14a at the tip of the rotating shaft is inserted into the boss 6C so as to be able to rotate.

Further, in the frame IIVC, the fixed scroll member 5 is fixed by a plurality of bolts, and the orbiting scroll member 6 is supported on the frame 11 by an Oldham mechanism 12 consisting of an Oldham ring and an Oldham key. It is designed to rotate without rotating. A motor shaft 141) is integrally connected to the rotating shaft 14 at the lower part thereof, and the motor section 3 is directly connected thereto. A vertical suction pipe 17 is connected to the suction port 16 of the fixed scroll member 5 through the closed container 1, and the upper chamber 1a+-1' passage 1 has a discharge port 10 opened therein.
g&, 18t) and communicates with the upper motor room 1b. This upper motor chamber 1b communicates with the lower motor chamber IC via a passage (45, 48) between the motor stator 8a and the side wall of the closed container 1. Further, the upper motor chamber 1b communicates with a discharge pipe 19 passing through the closed container 1.

Note that llf is a frame pedestal portion for fixing the electric motor 3 to the frame side. Note that 9 and 24 are first and second balance weights, which are balancing parts for canceling out the centrifugal force acting on the orbiting scroll 2, and swing around the main shaft 14. In addition, 25 in Fig. 2 is the electric motor 8.
This is a fixing bolt for fixing the frame pedestal part 11fVc.

As shown in FIG. 1, in order to effectively discharge oil from the lower bearing part 82 located below the main bearing part 31 to the lower part 2C of the oil container, the upper surface of the electric motor rotor part 86 facing the lower bearing part 32 Eccentric holes 26 and 27 are provided in the rotor section and extend in the radial direction, and oil is actively drained by utilizing the centrifugal force of the eccentric holes. (The 27 eccentric holes have different cross-sectional locations, so they are shown with dotted lines.) The eccentric holes 26.
The lower end portion of the rotor 27 is formed up to the rotor end portion 3d. As a result, the eccentric distance can be made as large as possible, and the ability to drain oil from the lower bearing portion can be increased. The oil discharged through these rotor eccentric holes 26, 27 sprays the inside of the coil end portion 8j of the electric motor 3, thereby improving the cooling effect of the electric motor. In order to smoothly drain oil from the lower bearing part 32, it is desirable that the opening positions of the eccentric holes 26, 27 on the upper surface of the rotor be at the same radial distance as the bearing surface of the lower bearing part 82.

Figure 8 shows the eccentric hole 28 provided in the rotor eccentric hole for the electric motor.
This is an example in which the balance hole is set to function as a second balance weight for offsetting the centrifugal force of the orbiting scroll 6. The balance hole 28 is arranged on the first balance weight 9 side for its function. By appropriately setting the hole diameter of the eccentric hole, the second balance weight 24 shown in FIG. 1 becomes unnecessary in this embodiment. As a result, the drive system can be made smaller and lighter, and it can also be expected to have the effect of reducing the vibration of the compressor as a whole.

With the above configuration, it is possible to suppress as much as possible the oil blown-up phenomenon caused by rotational centrifugal force of the upper rotor end portion 3C, which was observed in the prior art.

〔Effect of the invention〕

The present invention has the following effects.

(1) The amount of oil coming up in the compressor body can be reduced, which not only improves the reliability of the compressor, but also improves the performance of the entire refrigeration cycle (cooling capacity and heating capacity due to reduced pressure loss in piping). This has the effect of improving the coefficient of performance (FIH). The effects of the above items are particularly noticeable when speeding up the compressor. Furthermore, (2) the eccentric hole itself in the rotor can be used as a second balance weight, which can be expected to reduce the weight of the entire compressor. .

(3) The oil discharged through the rotor eccentric hole has an effective cooling effect on the electric motor.

[Brief explanation of drawings]

FIG. 3 is a longitudinal sectional view showing the overall structure of the hermetic scroll compressor, and FIG. 2 is a plan view of the electric motor 3 seen from below. 1... Airtight container 1a... Discharge chamber 1b... Motor chamber 3... Electric motor 5... Fixed scroll member 5
a... End plate 5b... Wrap 6... Orbiting scroll member 6a... End plate 6b... Wrap 16.
・・Suction port 8・Suction chamber 7・Compression chamber 10・
...Discharge port 14...Rotating shaft 14a...Eccentric shaft 1
9...Discharge pipe-sa: ) Agent Patent attorney Masao Ogawa

Claims (2)

[Claims] 1. A scroll compressor and an electric motor are housed in a sealed container and are connected to each other via a rotating shaft supported on a frame.
The scroll compressor divides the closed container chamber into upper and lower chambers, and a fixed scroll member and an orbiting scroll member, each of which has a spiral wrap standing upright on a disc-shaped end plate, are engaged with each other with the wrap inside, and the orbiting scroll member is attached to a rotating shaft. The orbiting scroll member engages with an eccentric shaft portion connected to the fixed scroll member and rotates relative to the fixed scroll member without rotating. The gas is sucked in from the suction port, moved around the compression space formed by both scroll members to reduce the volume and compress the gas, and the compressed gas is discharged into the upper container chamber from the discharge port, and the passage is opened. In a hermetic scroll compressor in which the oil is introduced into the lower container chamber through a pipe and discharged outside the device through a discharge pipe, oil is placed on the upper surface of the electric motor rotor facing the drain port of the lower bearing located below the main bearing. A hermetic scroll compressor characterized by an eccentric hole extending radially through the rotor. 2. The closed scroll according to claim 1, wherein the eccentric hole provided in the electric motor rotor portion is a balance hole having a function as a second balance weight for offsetting the centrifugal force of the orbiting scroll. compressor