JPH01300085A - Enclosed compressor - Google Patents

Abstract

PURPOSE:To separate oil in an enclosed casing so as to prevent oil from flowing out of a discharge pipe by opening an end of the discharge pipe finally discharging compression gas to the outside of enclosed casing on the central side rather than the inner dia. face of end ring of rotor. CONSTITUTION:An inner dia. face 22b of end ring 22a is tapered and opened on a mechanical part main body 7, and a discharge pipe 23 protrudes on a second chamber 16 at its end while the open end is opened on a central side rather than the inner dia. face 22b. The coolant including oil flowing in a second chamber 16 from a discharge hole 8 through a flow passage 17 flows in the direction of open end, but spiral gas flow is generated around the end ring 22a. The oil in the coolant is directed to an enclosed casing 1 side through centrifugal force by the aid of this flow, and finally only the coolant reaches the open end. It is thus possible to separate oil from the coolant gas in the enclosed casing 1 in a state that the coolant flowing out from the discharge pipe 23 to a cooling system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic compressor used in refrigeration cycles and the like.

2. Description of the Related Art A scroll type compressor as a conventional hermetic compressor will be explained with reference to FIGS. 3 and 4. 1 is a sealed casing, 2
is an electric motor section consisting of a rotor 2a and a stator 2b, and above it is a block 3° and a fixed scroll 4. A mechanical part main body 7 composed of an orbiting scroll 6 and an anti-rotation mechanism 6 is fixed. The fixed scroll 4 includes an end plate 4a and a wrap 4 having a thickness and height similar to an involute or an impolinate curve that stands upright on the end plate 4a.
b, and is fixed to the block 3 with an end plate 4a. Moreover, the orbiting scroll 6 is composed of an end plate 5a and a wrap 6b that stands upright on the end plate 6a and has the same curve as the wrap 4b of the fixed scroll 4, and the end plate 5a has a slight clearance between the end plate 4a of the fixed scroll 4 and the block 3. It is provided and supported by being sandwiched, and is restrained by an anti-rotation mechanism 6. The fixed scroll 4 and the orbiting scroll 6 each have a winding end 4b' of each wrap 4b and sb.

They are combined with sb' shifted by a certain angle.

8 is a discharge hole, and 9 is a suction hole. The discharge hole 8 is provided at the center of the involute of the fixed scroll 4, and the suction hole 9 is provided at the outer edge of the end plate 4a of the involute of the fixed scroll 4. 1o is the wrap 6b of the orbiting scroll 6
The protrusion provided on the other side is concentric with the center of the involute of the wrap 6b. Reference numeral 11 denotes a shaft supported by the block 3, which is provided at the end of the main body T side of the machine part and is eccentric from the center of the shaft by housing the protrusion 1o of the rotating scroll 6, so that it rotates with the stain motive unit 2. The scrolls 5 are connected. Reference numeral 12 denotes a back pressure chamber formed on the back surface of the orbiting scroll 5, which is sealed from the lap 6b side of the orbiting scroll 6 by end plates 6a and 4a, and communicates with the compression space 13 formed by the fixed scroll 6 and the orbiting scroll 4. They communicate through holes 14&, 14b.

In addition, the mechanical part main body A is attached to the block 3 in the sealed casing 1.
Alternatively, the sealed casing 1 may be fixed at the outer periphery of the fixed scroll 4, and the inside of the hermetic casing 1 may be divided into two parts: a first chamber 15 above the fixed scroll 4 and a second chamber 16 below the promak 3. and the second chamber 16 are in communication via a flow path 17. 1
8 is a suction pipe, 19 is a discharge pipe, and the discharge pipe 19 opens into the second chamber 16 between the mechanical part main body 7 and the electric motor part 2.

20 is lubricating oil collected in the lower part of the sealed casing 1.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 110 accompanying the rotation of the electric motor section 20 is transmitted to the orbiting scroll 6 via the boss section 11a and the protruding section 1o, but due to the action of the rotation prevention mechanism 6, the orbiting scroll 6 does not rotate on its own axis and the fixed scroll 4 rotates. Rotates around the center of the involute. At this time, the end sb' of the wrap 6b of the orbiting scroll 6 contacts the fixed scroll 4O, 7'4b, and the end 4b' of the wrap 4b of the fixed scroll 4 contacts the wrap 6b of the orbiting scroll 6. When the suction is completed (l), as the orbiting scroll 6 revolves, the wraps 4b and 5b
As the two contact points approach the center of the involute, the pressure in the compression space 13 increases.

By the compression mechanism of this scroll compressor, the refrigerant sucked from the suction pipe 18 through the suction hole 9 is compressed.
After being discharged into the first chamber 16 through the flow path 17, the fluid is discharged into the second chamber 16 through the discharge pipe 19 and into a cooling system (not shown).

Note that the arrows indicate the flow of refrigerant gas, and the dots indicate the flow of oil.

Problem to be Solved by the Invention However, in the above configuration, the compressed refrigerant gas mixed with oil discharged from the discharge hole 8 flows into the second chamber 16 via the flow path 17 and passes through the discharge pipe 19 to the cooling system. However, oil separation from the compressed refrigerant gas in the second chamber 16 is insufficient, and a large amount of oil flows out through the discharge pipe 19 into the cooling system. That is, the second chamber 1 of compressed refrigerant gas containing oil
The change in flow direction at step 6 is only required once, and
The oil that lubricates the cooling system mixes with the gas flow that has been redirected, resulting in a lot of oil leaking into the cooling system.

Furthermore, the inventor has found through experiments that when capacity control operation is performed using an inverter, which has recently become popular, the amount of oil leaking into the system increases quadratically, especially when operating at high speeds.

As described above, when the amount of oil leaking into the system increases, the amount of lubricating oil inside the sealed casing 1 decreases, making it impossible to supply oil to each sliding part and causing wear.

There was a problem in that a burn-in phenomenon occurred.

In addition, when a large amount of oil leaks into the system, the efficiency of heat exchange in the condenser and evaporator (not shown) decreases, resulting in a decrease in the efficiency of the air conditioner.

The present invention eliminates the drawbacks of the conventional example described above, and aims to separate oil within a sealed casing and prevent oil from flowing out from a discharge pipe.

Means for Solving the Problems In the present invention, one end of the discharge pipe is opened in the center of the inner diameter surface of the tapered end ring of the rotor.

Function: With the above-described configuration, the present invention can separate oil from oil-containing compressed refrigerant gas and discharge only the gas component to the cooling system. Therefore, the amount of lubricating oil inside the sealed casing does not decrease, causing wear.

Burn-in will be eliminated and the efficiency of the heat exchanger will not decrease.

Example An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted. Also, the arrows in the figure indicate the flow of refrigerant, and the fish eggs indicate oil.

22 is a rotor fixed to the shaft 11, and the inner diameter surface 22b of the end ring 22a on the side of the main body 7 of the mechanical section is tapered open toward the main body 7 of the mechanical section.

Further, one end of the discharge pipe 23 protrudes into the second chamber 16, and the open end 23a is located closer to the center than the inner diameter surface 22b of the end ring 22a.

Next, we will discuss the operation.

The compressed refrigerant gas containing oil discharged from the discharge hole 8 flows out into the second chamber 16 via the flow path 17 and changes its flow toward the discharge pipe 23 . At this time, the oil in the refrigerant is separated from the refrigerant to some extent by inertia.

In addition, the oil that has lubricated the bearing part 21 rotates in a spiral along the tapered inner diameter surface 221) of the end ring 22a, is blown toward the sealed casing 1 by centrifugal force, and travels along the inner circumferential surface of the sealed casing 1 to the bottom. It accumulates in At this time, a spiral gas flow is also generated along the inner diameter surface 22b of the end ring 22a.

The refrigerant flowing into the second chamber 16 described above flows in the direction of the open end 23a of the discharge pipe 23, but as described above, a spiral gas flow is generated near the end ring 22a, so the refrigerant flows along this flow. The oil in the refrigerant is blown toward the closed casing 1 by centrifugal force, and only the refrigerant reaches the open end 23a.

Therefore, the refrigerant flowing out from the discharge pipe 23 into the cooling system contains almost no oil, and the oil in the compressed refrigerant gas is separated within the sealed casing 1.

As described above, according to the present invention, most of the oil in the compressed refrigerant gas once discharged into the sealed casing 1 is separated and only the separated refrigerant flows out into the cooling system. The lubricating oil inside the sealed casing does not decrease.

The efficiency of the heat exchanger is also prevented from decreasing. During particularly busy high-speed operation, the aforementioned swirling flow becomes stronger, so the separation effect becomes even greater.

In the present invention, it is important to arrange the open end of the discharge pipe inside the spiral flow, and the shape of the discharge pipe is arbitrary. Furthermore, the oil separation effect can be further improved by forming fins on the inner diameter surface of the end ring to strengthen the spiral flow.

Effects of the Invention As is clear from the above explanation, the present invention provides a tapered inner diameter surface of the end ring on the side of the rotor's mechanical part main body, and a tapered end ring at one end of the discharge pipe for finally discharging the compressed gas discharged from the discharge hole. The opening is opened toward the center of the inner surface of the end ring, which improves the oil separation effect within the sealed casing, prevents the lubricating oil inside the sealed casing from decreasing, prevents wear and seizure, and improves the cooling system. This has the effect of suppressing a decrease in the efficiency of the heat exchanger because the amount of oil flowing out into the heat exchanger is reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a hermetic compressor showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a longitudinal sectional view of a conventional hermetic compressor. FIG. 4 is a sectional view taken along the line PI-N' in FIG. 3. DESCRIPTION OF SYMBOLS 1... Sealed casing, 2... Electric motor section, 2b... Stator, 7... Mechanical part main body, 8... Discharge hole, 11...Mountain/Shaft,
22...Rotor, 22a...End ring, 22b...Inner diameter surface, 23...Discharge pipe. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
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Claims (1)

[Claims] A mechanical part main body having a discharge hole for discharging compressed gas fixed to the sealed casing is provided in a sealed casing, and an electric motor part consisting of a stator and a rotor fixed to a shaft, the mechanical part main body of the rotor. The inner diameter surface of the side end ring is tapered, and one end of the discharge pipe for finally discharging the compressed gas discharged from the discharge hole to the outside of the sealed casing is opened toward the center side from the inner diameter of the end ring of the rotor. Hermetic compressor.