JPS61108882A - Oil supply device of horizontal compressor - Google Patents

Abstract

PURPOSE:To stably supply oil to a compressor when its speed is in both a low and a high region, by forming the compressor combining an oil pump mechanism with an oil scraping mechanism. CONSTITUTION:A compressor 1 combines an oil pump mechanism with an oil scraping mechanism, and when an electric motor is driven in a low rotary frequency, the compressor ensures a supply quantity of oil by actuating the oil pump mechanism 12 high setting an oil pressure regulating valve. While the compressor, when the electric motor is in a high rotary frequency, both stops the oil pump mechanism 12 and supplies by the oil scraping mechanism 9 a fixed quantity of oil accumulated in an oil reservoir part 10 to each sliding part. By this constitution, the oil can be stably supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an improvement in a lubricating device for a horizontal compressor used for freezing, refrigeration, air conditioning, etc. This invention relates to a horizontal compressor that performs capacity control by changing the

(b) Conventional technology Generally speaking, the oil supply system for horizontal compressors is
There are two types: one based on an oil pump mechanism disclosed in Japanese Utility Model Publication No. 110, and the other based on an oil scooping mechanism disclosed in Japanese Utility Model Publication No. 52-21927. The former will be explained in detail below.

An oil pump is provided on one side of the rotating shaft, and an oil passage is provided that communicates the pump with an oil sump at the bottom of the compressor. Oil was supplied to the oil supply hole of the rotating shaft to lubricate each sliding part. In the latter type, an oil scraper arm is attached to one end of the rotating shaft, and an oil reservoir is provided on the side wall of the compressor located near the oil scraper arm, and the oil scraper arm rotates together with the rotating shaft. After the oil stored at the bottom of the compressor is pumped up to the oil sump, the oil sump also guides the oil to the oil supply hole of the rotating shaft to lubricate each sliding part of the shaft.

(／→ The problem that the invention is trying to solve is
Both the oil pump mechanism and the oil scraping mechanism described above have the following problems when applied to compressors equipped with an inverter drive system, which has been increasingly adopted recently, and it is necessary to improve them. Measures were required.

In other words, in the case of an oil pump mechanism, the amount of oil supplied can be ensured by increasing the oil pressure of the pump by increasing the setting of the oil pressure regulating valve when the rotational frequency of the electric motor is low (for example, 15 to 30 Hz). However, when the rotational frequency is in a high range (e.g. 80 to 120 [(z)), the pump's oil pressure cannot be controlled just by opening the oil pressure adjustment valve (the oil pressure increases rapidly and the lubrication of the 5-rotation shaft becomes difficult). There is a problem in that more oil than necessary is forced into the hole, leading to an increase in oil discharge, and the oil pump generates noise or is damaged due to an abnormal increase in the pump rotation speed and oil pressure. In the case of an oil scraping mechanism,
Even when the electric motor is driven in a high rotational frequency range and the amount of oil pumped up by the oil scraper arm increases, the amount of oil stored in the oil sump will never exceed a certain amount, so the amount of oil supplied will be excessive. However, when the 9-rotation frequency becomes low, the number of times the oil scraping arm pumps the oil decreases, and the oil in the oil sump becomes too low, making it more likely to cause an oil supply shortage. There was a problem.

This proposal was made in view of this point, and is for a horizontal compressor in which capacity is controlled by changing the rotational frequency of the electric motor using an inverter drive or the like.

Prevents insufficient oil supply in low rotational frequency ranges, while preventing oil pump noise and damage in high single rotational frequency ranges, ensuring stable oil supply in both low and high single rotational frequency ranges. The purpose is to provide a refueling device that can be used.

Means for Solving the Problems The present invention provides a horizontal compressor that performs capacity control by changing the rotational frequency of an electric motor. When the rotational frequency b' of the electric motor is low, an oil pump mechanism is used, and at other times, an oil scraping mechanism is used to supply oil to each sliding portion of the rotating shaft.

((E) Function) The horizontal compressor oil supply system of the present invention is configured as described above, so that when the rotational frequency of the electric motor is lower than the frequency of the commercial power supply, the oil pump mechanism with the hydraulic pressure regulating valve set high is activated to rotate the horizontal compressor. Even if the number of rotations is low, a predetermined oil pressure can be maintained to ensure the amount of oil supplied, while when the frequency of one rotation is equal to or higher than the frequency of the commercial power supply, the operation of the oil pump is stopped and an oil scooping mechanism is used. A fixed amount of oil stored in an oil reservoir is supplied to each sliding part, and stable oil supply is achieved in both low and high frequency ranges of one revolution.

(f) Example An embodiment of the present invention will be described below based on the drawings.

(1) is a motor room (5) where the electric motor section (4) is housed, and a compressor section (6) inside the machine frame body (2), separated by a partition wall (3).
It is divided into a pump room (7) where is stored, and
This compressor (1) is a horizontal compressor in which the two parts (41 (6)) are connected by a horizontal rotating shaft (8). The capacity is controlled so that the speed changes over a wide range (for example, 15 to 120 km).(9) is an oil scraper arm attached to the end of the rotating shaft (8) on the motor chamber (5) side. .

αα is an oil sump formed in the cover plate U on the side of the motor chamber (5), and these oil scraping arms (9) and the oil sump (II) constitute an oil scraping mechanism. (121 is: pump room(
7) This is an oil pump attached to the side cover plate αJ. This oil pump consists of one main body I and a cover (
15), an external gear 16) and an internal gear (I7) housed in one main body, both gears t161 (ball 08 that presses 171), a spring (llJl and a plate), the internal gear fin and the rotating shaft. (8) a spindle CD connecting the
It consists of a hydraulic pressure regulating valve (c) housed on the discharge passage (22) of this pump (121), and an excitation coil c24 attached to the main body α so as to surround the spindle shaft υ. And this oil pump (17J is
The rotation frequency of the electric motor section (4) is equal to the frequency of the commercial power supply (50
Hz/60tlz), the spindle Qυ connects the internal gear (17) and the rotating shaft (8) as shown by the dashed line in Fig. 2, and is interlocked with the rotating shaft (8), but the electric motor section When the rotational frequency of (4) is the frequency of the commercial power supply or higher than that, the excitation coil (24) is excited by the high current value of the motor section (4) and moves the spindle (21) to the right in Fig. 2. It is designed to be separated from the rotating shaft (8). Here, to explain the oil pressure regulating valve (c), this regulating valve is the oil pump C1.
2 discharge passage (2 suddenly connected cavity 4, a small hole (marked 2) and a cavity (2) communicating between this cavity and the inside of the pump chamber (7)
It is composed of a piston (9) housed in the piston (9) and a spring (28I) that presses the piston. When the oil pressure in the discharge passage becomes higher than a predetermined value, the piston (2) compresses the spring and discharges the piston. By communicating the passage (2) with the small hole Qe and discharging excess oil from the small hole 4 to the lower part of the pump chamber (7), it functions so that the oil pressure of the oil pump α is always constant. At this time, (1) this oil pressure regulating valve according to the present invention uses a spring (C) with a larger pressing force than a normal spring, which makes it difficult to open the regulating valve (C). ) is set so that the oil pressure of the oil pump (1z) increases to a desired value even when the rotational frequency of the oil pump (1z) is low.

In the horizontal compressor configured in this way, when the rotation frequency of the electric @ part (4) is low (for example, 15 to 40 Hz), such as when starting the compressor, the oil pump (1
The spindle (2I) of 21 has an internal gear (171) and a rotating shaft (
8), this oil pump +121 releases the oil stored in the lower part of the pump chamber (7).

The rice is pumped up through the strainer (2) through the suction passage and the oil supply hole (8a) of the rotating shaft (8) through the discharge passage.
) and supplied to each sliding part of the shaft. Also,
During normal operation of the compressor, when the rotational frequency of the turtle motor section (4) becomes equal to or higher than the frequency of the commercial TS (for example, 50 to 120Hz), the spindle Qυ of the oil pump (1z) is The oil scraper arm (6) is separated from the rotating shaft (8) and refuels exclusively by the oil scraping mechanism.
9) Therefore, the oil stored in the lower part of the motor chamber (5) is pumped up to the oil sump mouth (2), and oil is supplied from this oil sump to each sliding part of the shaft via the oil supply hole (8a). will be carried out. here.

Oil sump (88 of 101 is unchanged, so the amount of oil stored in this oil sump does not exceed a certain amount, and the oil supply capacity to each sliding part is large (does not change.6 The compressor of the present invention maintains the pressure in the motor chamber (5) so that the pressure in the motor chamber (5) is equal to or slightly higher than the pressure in the pump chamber (5) in order to ensure the amount of oil pumped in each of the oil pump mechanism and the oil scooping mechanism. It is set to .

(G) Effects of the Invention As described above, the present invention provides a horizontal compressor that performs capacity control by changing the rotational frequency of an electric motor.

This compressor is equipped with both an oil pump mechanism and an oil scooping mechanism, and the oil pump mechanism is used when the rotational frequency of the electric motor is low, and the oil scooping mechanism is used at other times when the rotational frequency of the motor is low. Since it is configured to supply oil to each sliding part, etc., in areas where the rotational frequency of the motor is low, it is necessary to prevent insufficient oil supply by using an oil pump with a high hydraulic pressure adjustment valve setting. At the same time, by not using the oil pump in areas with high rotational frequencies, it is possible to prevent noise and damage to the pump, as well as an increase in oil discharge due to oversupply of oil, ensuring stable oil supply regardless of the rotational frequency. A refueling device that performs this can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a horizontal compressor showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of an oil pump section, and FIG. 3 is a sectional view of a hydraulic pressure regulating valve in the oil pump. +11...Horizontal compressor, (4)...Electric motor section, (8
)...rotating shaft, (9)...oil scraper arm, (1■...
Oil sump section, (121...Oil pump. Applicant: Sanyo Electric Co., Ltd. and one other representative: Shizuo Sano, patent attorney. Figure 2 - Ab-only - Figure 3

Claims (1)

[Claims] (1) In a horizontal compressor that performs capacity control by changing the rotation frequency of the electric motor, the compressor is equipped with an oil pump mechanism and an oil scooping mechanism, and when the rotation frequency of the electric motor is low, the oil pump mechanism is 1. An oil supply device for a horizontal compressor, characterized in that, at other times, an oil scooping mechanism is used to supply oil to each sliding part of a rotating shaft.