JPS62284982A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To improve abrasion resistance by setting a ring harder than the material of a rotation scroll at the boss part of the rotation scroll so as to insert into an engage with and engagement recess part. CONSTITUTION:A ring 15 being harder than the material of a rotation scroll 10 is set at the boss part 14 of a rotation scroll 10. The upper end part of a crank shaft 4 becomes a main shaft part 16 and an engagement recess part 17 is provided there. A metal 19 is engaged along the periphery of the engagement recess part 17, which so supports a boss part as to rotate freely 14 through the ring 15. Accordingly the abrasion at the boss part 14 of the rotation scroll 10 and at the engagement recess part 17 of a crank shaft 4 is contrived to improve.

Description

Detailed Description of the Invention] 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention provides a method for introducing compressed gas into a compression space formed between an orbiting scroll and a fixed scroll. The present invention relates to the closed scroll pressure m that is compressed by the compressed air, and first of all, it concerns the improvement of the material of the boss portion of the orbiting scroll.

(Conventional technology) Compared to normally used reciprocating compressors and rotary compressors, there is less compression leakage during compression and higher efficiency, less torque fluctuation, less motion and lower noise. Hermetic scroll compressors are attracting attention because they do not require a suction valve and are highly reliable without problems such as fluid loss or damage caused by valves.

The general structure of this type of sealed scroll pressure $1 Akebono is that the compressor section is placed on the upper side of the frame provided in the sealed case, the electric power section is placed on the lower side, and the crankshaft is located approximately in the center of the frame. is inserted rotatably. The compressor section includes a fixed scroll having a spiral wrap integrally vertically disposed on the lower surface of the upper end plate, and an orbiting scroll having a spiral wrap integrally erected on the upper surface of the lower end plate,
Both the fixed scroll and orbiting scroll wraps are assembled on top of each other. A boss portion is integrally provided on the lower surface of the orbiting scroll, and this boss portion is engaged with an engaging recess provided eccentrically at the upper end of the crankshaft.

A high-pressure ring that receives the thrust load of the orbiting scroll and an Oldham ring that prevents rotation of the orbiting scroll are provided on the upper surface of the frame, and the orbiting scroll is supported through these rings. The electric motor section includes a rotor that is fitted onto the crankshaft, and a stator that is fixed to the outer peripheral surface of the rotor with a narrow gap therebetween.

Like this! A closed scroll compressor is configured, and an orbiting scroll is driven to orbit via a crankshaft by energizing an electric motor section, and a compression space formed between this wrap and a wrap of the fixed scroll changes continuously. . Along with this, compressed gas such as refrigerant gas is sucked into the compression space through a suction passage provided in the closed case and the frame. The gas to be compressed is gradually compressed in a spiral manner toward the center as the orbiting scroll rotates, and turns into high-pressure gas. Then, it is led out from the discharge pipe to an external connected device, for example, a condenser.

Incidentally, as a result of such an action, a compressive force acts on the orbiting scroll, and this force is received by the frame via the engagement recess of the crankshaft. Therefore, the boss portion needs to have great rigidity and high hardness.

Generally, it is known that if the shaft material and the bearing material have the same hardness, mutual wear will increase and durability will be impaired. A difference in hardness is also required between the boss portion of the orbiting scroll and the engaging recess portion of the crankshaft. However, if the orbiting scroll is hardened, for example by hardening, the wrap will be affected as well.
Ru. That is, this wrap is always in contact with the wrap of the fixed scroll and must maintain an accurate shape, but there is a risk of thermal deformation due to the above processing. For this reason, no particular measures have been taken to increase the hardness of the orbiting scroll, and the boss and the crankshaft are currently used with almost no difference in hardness, so they wear out relatively quickly. There was a problem with durability.

(Problems to be Solved by the Invention) The present invention improves the means for removing the hardness difference that causes the above-mentioned adverse effects, makes it possible to take the hardness difference relatively easily, and improves wear durability. The object of the present invention is to provide a closed-section type scroll compressor that can be improved.

[Structure of the invention]

(Means for Solving the Problems) That is, the present invention involves inserting and engaging the boss portion of an orbiting scroll into an eccentric engagement recess of a crankshaft, and combining the orbiting scroll and the fixed scroll to compress the compressed scroll into the compression space of each other. A hermetic scroll compressor that introduces and compresses gas, characterized in that a ring having a harder material than the material of the orbiting scroll is attached to the boss portion of the orbiting scroll, and the ring is inserted and engaged in the engagement recess. .

(Function) With this configuration, the boss part of the orbiting scroll comes into contact with the engagement recess of the crankshaft via the ring with different hardness, and the hardness of the boss part itself increases and the engagement recess Less wear.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a closed case, and a frame 2 is provided inside this closed case 1. As shown in FIG.

A pressure N machine section 3 is disposed on the upper side of the frame 2, and an electric motor section (not shown) is disposed on the lower side thereof, and a crankshaft 4 is rotatably inserted through the substantially central portion of the frame 2.

The compressor section 3 includes a fixed scroll 7 having a spiral wrap 6 integrally vertically disposed on the lower surface of an upper end plate 5, and an orbiting scroll 1o having a spiral wrap 9 integrally erected on the upper surface of the upper end plate 8. It consists of.

The orbiting scroll 1o is connected to the crankshaft 4 as described later. Note that both the wraps 6.9 of the fixed scroll 7 and the orbiting scroll 10 are combined in a superimposed state. On the other hand, a discharge hole 11 is formed approximately in the center of the upper end plate 5, and a high-pressure case 12 fixedly attached to the upper end plate 5 covers this. A high-pressure ring (not shown) that receives the thrust load of the orbiting scroll 10 and an Oldham ring 13 that prevents rotation of the orbiting scroll 1o are provided on the upper surface of the frame 2, respectively.

In other words, the frame 2 rotatably supports the orbiting scroll 10 via the high pressure ring and the ono dam ring 13.

Next, the connection structure between the crankshaft 4 and the orbiting scroll 10 will be explained. That is, as shown in FIG. 2, a boss portion 14 is integrally protruded from the lower surface of the lower end plate 8 constituting the orbiting scroll 1o, and a ring 15 is press-fitted into the boss portion 14. The ring 15 is made of shoulder material, and a material whose hardness is much higher than that of the orbiting scroll 1o is selected. As shown again in FIG. 1, the upper end of the crankshaft 4 is a main shaft portion 16 having a larger diameter than the lower portion thereof, and a shaft portion 16 is provided at a position eccentric from the shaft center by a predetermined dimension. An engaging recess 17 is provided. The metal 18 is l1l1 on the outer peripheral surface of the main shaft portion 16.
1 and is rotatably supported by the frame 2. Further, a metal 19 is inserted into the circumferential surface of the engagement recess 17, and rotatably supports the boss portion 14 via the ring 15. That is, although this metal 19 and the ring 15 come into direct contact, the hardness of the metal 19 is much lower than that of the ring 15, and a sufficient hardness difference is maintained.

In this way, a hermetic scroll compressor is constructed, and by energizing the electric motor, the engagement recess 1 of the crankshaft 4 is
7 makes an eccentric rotation. The orbiting scroll 10 is driven to orbit via the boss portion 14 inserted and engaged here, and a substantially crescent-shaped compression is formed between this wrap 9 and the wrap 6 of the fixed scroll 7! The shape changes continuously. Along with this, the gas to be compressed, such as refrigerant gas, released into the sealed case 1 is introduced into the compressor. As the orbiting scroll 10 rotates, the compressed gas is gradually compressed in a spiral manner toward the center and turns into high-pressure gas. Then, the high pressure case 1 is
2 and from there it is led out to an external connection, for example a condenser.

During such a compression operation, the ring 15 of the boss portion 14 and the metal 19 of the engaging recess 17 are always in contact. However, since these materials are selected to have a high difference in hardness, the wear a of the metal 19 in particular can be almost ignored. Therefore, the orbiting scroll 10
And the durability of the crankshaft 4 is significantly improved.

Note that in the above embodiment, the main shaft portion 16 of the crankshaft 4
Although the metal 18 is fitted to the peripheral surface, the frame 2 is not limited to this, and the frame 2 rotatably supports the main shaft portion 16.
Metal may be fitted to the bearing part.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to improve the wear of the boss portion of the orbiting scroll and the engagement recess of the crankshaft that engages with the boss portion, and to obtain effects such as significantly improving durability and reliability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional view of the main parts of a hermetic scroll compressor, and FIG. 2 is a vertical cross-sectional view of an orbiting scroll. 17... Engagement recess, 4... Crankshaft, 14...
Boss portion, 10... Orbiting scroll, 7... Fixed scroll, 15... Ring.

Claims (1)

[Claims] A crankshaft having an eccentric engaging recess at its end; an orbiting scroll having a boss portion inserted into and engaging the engaging recess of the crankshaft and rotating eccentrically as the crankshaft rotates; A fixed scroll is provided that introduces and compresses gas to be compressed into a compression space, and a ring made of a material harder than the material of the orbiting scroll is attached to the boss portion of the orbiting scroll, and the ring is inserted and engaged in the engagement recess. A hermetic scroll compressor featuring: