JPS6258094A - Horizontal scroll compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a horizontal scroll compressor used in refrigerators, air conditioners, and helium compressors, and particularly to a horizontal scroll compressor that maintains an appropriate level of oil accumulated in a motor chamber. This invention relates to a structure that prevents agitation of oil.

[Background of the invention] - A conventional horizontal scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 59-6009.
As described in Publication No. 2, no particular consideration is given to the management of oil accumulated at the bottom of the closed container (oil level adjustment). The oil returned from the low-pressure side evaporator (not shown) eventually accumulates at the bottom of the container of the compressor. The interior of the sealed container is a discharged gas atmosphere under high pressure. If the oil level at the bottom of the motor chamber rises to the point where it submerges the rotor on the motor side, oil agitation loss occurs as the rotor rotates. In this case, the oil droplets blown up by the rotor are carried away with the refrigerant gas to the outside of the compressor, resulting in a problem that the amount of oil coming up from the compressor increases.

Further, in the case of a horizontal scroll compressor, compared to a vertical scroll compressor, there is a problem that the same amount of oil cannot be filled even if the oil level is the same, and the amount of oil itself is smaller. If the amount of oil is increased from the standpoint of compressor reliability, the above-mentioned problems will become even more serious.

[Purpose of the invention]

The purpose of the present invention is to maintain the level of oil accumulated at the bottom of the motor room at an appropriate level, thereby reducing the oil agitation loss caused by the motor and the amount of oil rising from the compressor itself, and preventing an increase in input power. The objective of the present invention is to provide a horizontal scroll compressor with improved performance and high reliability.

[Summary of the invention]

In order to achieve this object, in the present invention, a gas flow path that communicates the discharge chamber on the opposite side of the fixed scroll with the motor chamber on the motor side is connected to the outer edge of the end plate of the fixed scroll and engaged therewith. This structure is characterized in that it is provided on the outer periphery of the frame, and the flow path is provided at the same height position as the lower end of the motor rotor, thereby allowing the gas flow to communicate between the discharge chamber and the motor chamber. The flow path section can have a function of adjusting the oil level in the closed container.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, the hermetic scroll compressor has a scroll compressor section and an electric motor s3 placed in a hermetic container on a rotating shaft 14.
The compressor section is arranged on the left side, the electric machine section is arranged on the right side, and the closed container chamber is connected to the discharge chamber 2a formed on the left side of the compressor section 5.6. It is divided into a motor chamber 2b formed on the right side of the machine section and in which the electric motor 3 is disposed, and both chambers communicate with each other via a passage. The scroll fluid machine section includes an end plate, an orbiting scroll member 6 formed by standing upright a wrap formed by an involute or a curve close to an involute on this end plate, and an orbiting scroll member 6 with the wrap upright on the end plate and discharge near the center of the end plate. Boat 5a, fixed scroll members 5 having a structure in which a suction boat 7 is opened on the outer periphery are engaged with each other with their laps facing inward, and both of these members are housed inside a casing having a suction pipe 8 and a discharge pipe 19. There is.

An Oldham mechanism 12 for preventing rotation of the orbiting scroll member 6 is provided between the orbiting scroll member 6 and the frame 4 or the fixed scroll member 5, and an eccentric shaft 14a connected to the rotating shaft 14 is engaged with the orbiting scroll member 6. and eccentric shaft 1
The orbiting scroll member 6 is rotated without rotating by the orbiting motion of 4H, compressing the gas in the closed space formed by both scroll members, and discharging the compressed gas from the discharge bow 5a into the discharge chamber. Communication passages 18a, 18
The compressed gas is led to the right motor room 2b through the pipe 19, where the oil is separated, and only the compressed gas is sent out of the machine via the discharge pipe 19.

Note that the arrow in the figure indicates the flow direction of the refrigerant gas.

Oil is supplied to the slewing bearing 25, main bearing 26, auxiliary bearing 27'28, etc. by inflowing oil from an oil supply pipe 40 engaged with the frame. The oil flowing in from the frame oil supply hole 14g is supplied to the bearing portions through the oil supply hole 14f provided in the main shaft 14 by differential pressure oil supply.

FIG. 2 is a plan view of the fixed scroll member 5, which is a view taken from the side A- in FIG.

FIG. 3 is a sectional view taken along line BB in FIG. 1, and shows a plan view of the frame 4. FIG.

In both figures, gas flow paths 18a and 18bk that communicate the discharge chamber 2a on the opposite side of the fixed scroll 5 with the electric motor chamber 2b on the side of the electronic engine are connected to the outer edge 5f of the end plate 5C of the fixed scroll 5, and The outer peripheral portion 4fiC of the frame 4 is provided so as to engage with the outer peripheral portion 4fiC of the frame 4, and the flow path is provided at substantially the same height as the lower end portion of the motor rotor 3b.

That is, here, DR: Outer diameter (II) of the motor rotor 3b lK: Distance between the position of the lower end of the communication passage for gas flow path and the center of the rotor (main shaft) (II) Communication passage for gas flow path 188 is provided in a rectangular shape on the outer edge portion 5f of the end plate of the fixed scroll 5, and forms a flow path 183 with the inner wall surface of the casing portion 1b of the closed container. The flow path 18
a is set at the middle position of the stop bolt seat 5j that fixes the fixed scroll 5 to the frame 4. Similarly, on the frame side, a rectangular notch +8b is provided in the outer edge portion 4f of the frame so as to engage with the gas flow path tea.

Note that 4C is a boss portion having a groove portion 4d that engages with the rotation prevention member (Oldham ring) 12. 4b is a fixing screw portion for fixing the fixed scroll.

FIG. 4 is an internal perspective view showing how refrigerant gas flows through the gas flow communication passages 18a and 18b.

From the above explanation, in the horizontal scroll compressor of the present invention,
The level of the oil surface 22a can be maintained up to a maximum of 10°.

This position is expressed by the following equation.

Here, Dci: Chamber inner diameter (1
ml) By adopting this configuration, it is intended that the gas flow path section that communicates the two chambers 2a and 2b can have the function of controlling the oil level in the closed container.

Next, the operation will be explained in detail.

In the case of a horizontal scroll compressor, oil mixed in the refrigerant gas is separated in the discharge chamber 2a and the motor chamber 2b on the opposite side of the fixed scroll 50. Separated oil is stored in each chamber 2
It falls and is collected at the bottom of a and 2b. Although it is related to the amount of oil sealed in the container, the oil level 22a gradually rises and reaches the lower end of the gas flow communication passage 13a (18b).

When the oil level further rises, the oil above the lower end of the gas flow path 18H is blown up toward the motor room 2b together with the refrigerant gas, and the oil 22 becomes atomized.

As a result, the oil levels in both chambers 2a and 2"b can be maintained at the same position at all times, and the rotor 3b of the electric motor 3
does not stir the oil, so stirring losses are reduced.

The flow direction of gas in the closed container from the gas flow path 18b to the discharge pipe 19vc is the cough flow path 18 (18a).

18b) is provided below the comparison, so it always exhibits an upward flow. Therefore, in the process of such gas flow, the oil separation effect due to the action of the oil particles' own weight can be sufficiently exerted, and as a result, the oil separation efficiency of the container itself can be increased.

FIGS. 5 and 6 show an embodiment in which gas flow passage portions 18.50 communicating the discharge chamber 2a and the motor chamber 2b are provided at symmetrical positions.

With this configuration, (1) oil level management becomes more reliable; Furthermore, (2) since the cross-sectional area of the gas flow path portion 18.50 increases, the pressure loss when the refrigerant gas passes through this flow path is reduced. Therefore, the pressure difference between the discharge chamber 2a and the motor chamber 2b is minimized. There are other effects.

FIGS. 7 and 8 show the embodiments of FIGS. 5 and 6,
Flow path 51 (5ta, 5+b) that communicates both chambers 2a and 2b
This is an embodiment in which it is provided on the outer periphery of the t-1 fixed scroll side and the frame side. The flow path 51 only serves as a gas flow path,
There is no oil level adjustment function.Discharge chamber 2a and motor chamber 2b
The gas passage section 18.50 etc. that communicates with the casing 1b
Since it is engaged with the body, the oil in the refrigerant gas passing through it adheres to the wall surface of the casing body.Q1 The attached oil flows downward along the wall surface, and as a result, oil in the container itself Contributes to improving separation efficiency.

9 and 10 show an embodiment in which an oil passage 53 (53a, 53b) communicating the oil reservoir of the discharge chamber 2a and the motor chamber 2b is provided at the lower end of the outer edge of the fixed scroll and frame. . This auxiliary equalizes the oil level in the compartment, and 53 functions as an auxiliary oil equalizing passage.

〔Effect of the invention〕

According to the present invention, there are the following effects.

(1) The gas passage section that communicates the discharge chamber and the motor room has a function of controlling the oil level in the closed container, and the oil level in the compartment can be set to be the same.

(2) The oil level is always maintained at the lower end of the motor rotor, and oil agitation loss can be significantly reduced.

(3) In a horizontal scroll compressor, the amount of oil sealed can be set to the minimum required limit, and the amount of oil used can be saved compared to conventional machines.

(4) The oil separation efficiency of the closed container itself can be improved, and the amount of oil coming up inside the closed container of the scroll compressor can be significantly reduced. This has the effect of greatly contributing to not only improving the reliability of the compressor but also improving the performance of the refrigeration cycle as a whole.

[Brief explanation of drawings]

1 to 10 show embodiments of the present invention, and the first
The figure is a vertical cross-sectional view showing the overall structure of a horizontal scroll compressor, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is B-B in Figure 1.
-B sectional view, Figure 4 is a perspective view of the internal structure showing how gas flows around the communication passage 18, Figures 5, 7 and 9 are plan views of the fixed scroll, Figure 6, Figures 8 and 10
The figure is a plan view of the claim. 1... Airtight container 2a... Discharge chamber 2b...
Motor room 3...Electric motor 4...Frame
5...Fixed scroll 18...Gas flow path section
22...Oil pre-preparation m b

Claims (1)

[Claims] A compression mechanism that combines an orbiting scroll with a spiral wrap and a fixed scroll, a frame that supports the orbiting scroll, and an electric motor that drives a main shaft connected to the orbiting scroll are housed in a sealed chamber, and the back surface of the fixed scroll is housed in a closed chamber. In a horizontal scroll compressor with a high-pressure discharge gas atmosphere between the side and the motor side, the gas flow path that communicates the discharge chamber on the opposite side of the fixed scroll with the motor chamber on the motor side is connected to the end plate of the fixed scroll. 1. A horizontal scroll compressor, characterized in that the flow path is provided on the outer edge of the frame and on the outer periphery of the frame so as to engage with the outer edge, and the flow path is provided at substantially the same height as the lower end of the motor rotor.