JPS61155687A - Rotary compressor rotor - 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 [Technical Field of the Invention] The present invention relates to a rotor provided in a p-tally compressor.

[Technical background of the invention and its problems]

As shown in FIGS. 1 and 2, a rotary compressor used as an air conditioner is provided with a camshaft 2 supported on a bearing C in a casing 1 constituting a compression chamber. The rotor 3 provided inside is rotatably fitted and driven by a motor (not shown).
By rotating the camshaft 2 and rotating the cylinder 3, a predetermined gas is sucked into the puffer fish 1 through the suction port 4, compressed, and then discharged to the outside from the discharge port 5. Note that 1 in the figure is a partition partition that partitions the inside of the casing 1.

Incidentally, recently, in air conditioning equipment using a rotary compressor, an imperter method has been adopted as a method for controlling the operating state of the rotary compressor in order to change the operating capacity during cooling and heating. This inverter method changes the power frequency of the motor that drives the rotary compressor from the commercial frequency (60) 1 z) to a higher frequency, for example 120 Hz, and changes the rotation speed of the motor, thereby increasing the rotation of the rotor of the rotary compressor. The number of rotations can be controlled at high speed. Therefore, when operating air conditioning equipment, the motor power frequency should be changed from 60 Hz to 120 Hz to 180 Hz.
By changing the frequency to Hz, the rotational speed of the rotary congressor rotor can be rapidly increased and the normal operating state can be achieved in a short time from the start of operation.

In this way, the inverter system requires harsh operation on the rotary compressor, so the rotary compressor has a small load on the camshaft, which allows the camshaft to rotate easily even at high speeds, and is capable of handling rapid rotations at high speeds. It is required to be able to respond adequately to changes.

However, in conventional rotary compressors, a rotor made of cast iron is used. However, a rotor made of a cast product is heavy, and a large load is applied to the camshaft. As a result, the camshaft is unable to rotate easily at high speeds and seizes up on the bearings of the casing, making it unable to rotate, or the camshaft is unable to follow sudden changes in rotational speed, making it difficult to operate the rotary compressor. There is a problem of becoming.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and it is an object of the present invention to provide a rotor for a rotary compressor that can be rotated without placing a large burden on the camshaft to enable good operation of the rotary compressor.

[Summary of the invention]

The rotor of the rotary compressor of the present invention is:

It is characterized by being made of a metal with low specific gravity and wear resistance.

Metals forming the rotor of the present invention include titanium and titanium alloys, or aluminum and aluminum alloys. The specific gravity of these metals is 4.5 for titanium.
．． Aluminum shows a smaller value of 2.6 compared to 7.86 for iron.

For this reason, these metals are extremely lightweight, abundant, and have excellent wear resistance.

The rotor according to the present invention can be manufactured using either a melted material or a sintered body made of these titanium-based materials or aluminum-based materials. When applying a ceramic coating, a sintered body is preferable because it has a stronger adhesion density.

Since the rotor of the present invention manufactured in this way is made of a light titanium-based or aluminum-based metal, the camshaft of the quadri-tary compressor (does not apply a large load). Even when the rotary compressor is operated at a high speed of 120Hz, the camshaft rotates smoothly, preventing the camshaft from seizing up on the bearings and making it difficult to rotate. Furthermore, since the rotor of the present invention has excellent wear resistance, it can be used with sufficient durability to roll into contact with the inner circumferential surface of the casing during rotation.

Further, in the rotor of the present invention, it is preferable to perform a surface hardening treatment on the outer peripheral surface of the rotor in order to improve the wear resistance. Examples of the surface hardening treatment include nitriding treatment or ceramic coating.

In case of ceramic coating, cr205+F@
504 coating is preferred.A rotor subjected to surface hardening treatment in this manner can more reliably prevent wear caused by rotary compressor operation and improve durability.

In order to make the characteristics of the present invention effective, it is desirable that the combined blade be made of an iron-based sintered body (preferably a sintered high speed steel material or a sintered material coated with a ceramic coating). Similarly, the cylinder is preferably made of an iron-based sintered body or an iron-based sintered body subjected to Hull-1 treatment.

[Embodiments of the invention]

(1) A green compact made of TI-AtJ' alloy powder was sintered to form a sintered body, and a rotor that was nitrided and a rotor that was ceramic coated were manufactured from the sintered body.

(2) A green compact made of At-8s alloy powder was sintered to form a sintered body, and a rotor that was subjected to nitriding treatment and a rotor that was coated with ceramic coating 7 were manufactured on this sintered body, respectively. .

Example (1) The rotor manufactured in (2) was incorporated into an inverter type rotary compressor and used. As a result, even when the power supply frequency was set to 120 Hz, the rotary compressor could be operated satisfactorily, and the rotor could be used for a long period of time with little wear.

〔Effect of the invention〕

As explained above, the rotor of the rotary compressor of the present invention can be used in a rotary compressor installed in an inverter-type air conditioner that requires especially severe operating conditions, so that the rotary compressor can be used satisfactorily under high-speed operating conditions. The rotary compressor can be operated and the durability of the rotary compressor can be improved.

[Brief explanation of drawings]

Figure ta1 and Figure jK2 are a longitudinal cross-sectional view and a cross-sectional view showing a rotary compressor. 1...Casing, 2...Camshaft, 3...
Rotor. Applicant's agent Patent attorney Suzue Takehiko No. 1 1=m1 Figure 2

Claims (6)

[Claims] (1) A rotor for a rotary compressor characterized by being made of a metal with low specific gravity and wear resistance. (2) A rotor for a rotary compressor according to claim 1, wherein the metal is titanium or an alloy thereof. (3) A rotor for a rotary compressor according to claim 1, wherein the metal is aluminum or an alloy thereof. (4) A rotor for a rotary compressor according to claim 2 or 3, which is subjected to surface hardening treatment. (5) A rotor for a rotary compressor according to claim 4, wherein the surface treatment is nitriding treatment. (6) A rotor for a rotary compressor according to claim 4, wherein the surface treatment is a ceramic coating.