JP2003206882A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To separate lubricating oil discharged together with compressed gas from a discharge port, to prevent the separated oil from being discharged into a cycle, to enable recirculation usage of the oil, and to suppress noise from a compressor. <P>SOLUTION: This refrigerator includes a compressor 19 constituting the refrigerating cycle, a condenser 21, a restriction device 23, and an evaporator 17. The compressor 19 is constituted by fitting a spiral blade 53 so as to advance and retract from/to a spiral groove 51 with various pitches on the outer periphery of a rotary body 43 and a plurality of working chambers 55 of which the displacement volume sequentially changes are axially provided in a cylinder 41. The discharge port 61 is connected and communicated with the working chambers on the terminal end side. A closed space chamber 63 for separating the compressed gas from the lubricating oil R which are delivered from the discharge port 61 together is provided to prevent the lubricating oil R from being discharged into the cycle, and an oil drainage hole 67 communicating with the inside of a sealed case 25 is provided at a lower part of the closed space chamber 63. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator provided with a low pressure spiral type compressor.

[0002]

2. Description of the Related Art Generally, a refrigerator is provided with a compressor, a condenser, a throttle device, and an evaporator that constitute a refrigeration cycle, and is a means for sending cold air that has undergone heat exchange in the evaporator into a refrigerator by a fan or the like. ing. As the compressor, in addition to the reciprocating system and the rotary system, a spiral system compressor is provided.

An outline of the spiral type compressor is, for example, that spiral grooves having different pitches are provided on the outer peripheral surface of a rotating body that can be swiveled with respect to a cylinder, and spiral blades can freely appear and disappear in the spiral groove. By being inserted into the cylinder, a plurality of working chambers whose volume gradually decreases from the suction side to the discharge side along the axial direction in the cylinder are created.

Therefore, the rotary body is swirled without rotation, and the refrigerant is sequentially transferred from the suction side to the discharge side to be compressed and directly discharged from the discharge pipe into the cycle. A compressor of the type that discharges the gas discharged from the terminating end working chamber directly into the cycle is called a low pressure helical compressor.

[0005]

The spiral blade that forms the working chamber is made of a synthetic resin material having properties such as refrigerant resistance, durability, and a low bending coefficient. Immediately, the lubricating oil is constantly supplied to the blade from the point of reaching the life.

In addition, since the compressor is of a type that directly discharges the gas compressed in the working chamber on the end side into the cycle, a large amount of lubricating oil is discharged in addition to the compressed gas. .

Lubricating oil is discharged in a state that its particles are larger than that of the gasified compressed gas, so that the refrigerant flow noise is increased and the pulsation noise due to the discharge resistance at the time of discharge is increased, resulting in increased noise. Leads to.

[0008] Further, the refrigerant discharged into the cycle becomes thermal resistance by staying in the evaporator, and as a result that the performance deterioration is covered by the operating capacity, there is a problem that power consumption is increased.

Therefore, an object of the present invention is to provide a refrigerator in which the above-mentioned problems are solved by preventing compressed oil and lubricating oil discharged all at once from being directly fed into the cycle. I am trying.

[0010]

In order to achieve the above object, according to claim 1 of the present invention, in a refrigerator provided with a compressor, a condenser, a throttle device and an evaporator constituting a refrigeration cycle. The compressor is arranged in a closed case having a suction pipe, and one of which is rotatively moved by a rotational power from a driving means, and a cylinder, and a pitch provided on an outer circumference of the rotor is different. Via a spiral blade that is inserted into and retracted from the spiral groove to form a plurality of working chambers having different displacement volumes along the axial direction in the cylinder, and the suction pipe and the internal space of the sealed case. Suction port that communicates with the working chamber at the start end side, discharge port that communicates with the working chamber at the end side, a closed space chamber that covers the discharge port, and an extension projecting directly from the closed space chamber to the outside of the sealed case. With a discharge pipe Characterized in that the provided oil drain hole mutually communicating with the inside of the sealed casing in the lower part of the closed space chamber.

As a result, the rotating body makes a revolving motion with respect to the cylinder without rotation, so that the refrigerant taken in from the suction port is compressed while being sequentially transferred from the starting end side working chamber to the ending side working chamber. Then, the gas is directly discharged from the discharge port into the cycle through the discharge pipe. In this case, the compressed gas and the lubricating oil discharged together from the discharge port are once discharged into the large closed space chamber. At this time, the closed space chamber functions as a muffling chamber that absorbs sound energy,
Lubricating oil with large particles falls downward in the closed space chamber and is separated from the compressed gas.

The separated compressed gas becomes discharge gas and is discharged into the cycle. On the other hand, since the lubricating oil accumulates in the closed space chamber, it is possible to suppress the increase in the refrigerant flowing noise and the pulsating noise that accompany the lubricating oil. Further, since the lubricating oil does not stay in the evaporator, the performance is not deteriorated and the energy saving operation can be performed.

On the other hand, since the lubricating oil accumulated in the closed space chamber returns to the inside of the closed case from the oil drain hole, it is possible to recycle the lubricating oil for use.

Further, according to a second aspect of the present invention, a partition plate disposed between the discharge port and the discharge pipe port of the discharge pipe is provided in the closed space chamber.

As a result, the lubricating oil with large particles discharged together with the compressed gas from the discharge port hits the partition plate,
Since it drops downward, it can be reliably separated from the compressed gas, while the lubricating oil and the divided compressed gas can pass through the partition plate and flow into the cycle without any trouble.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings of FIGS.

FIG. 3 shows a schematic side view of the refrigerator 1. The inside of the refrigerator main body 3 is a refrigerating compartment 5, a vegetable compartment 7, and a freezing compartment 9 from above, and the front of each of the refrigerating compartment 5, the vegetable compartment 7 and the freezing compartment 9 is a refrigerating compartment door 11, a vegetable compartment door 13, and a freezing compartment. Room door 1
It is 5.

In the refrigerating compartment 5, the vegetable compartment 7, and the freezing compartment 9, the cold air, which has been heat-converted in the evaporator 17, is sent into each compartment through a cold air passage (not shown), so that a predetermined compartment temperature is obtained. It is supposed to be cooled.

The evaporator 17 is a compressor 1 as shown in FIG.
9, the condenser 21, the throttling device 23 is connected and communicated, the compressor 1
The refrigerant discharged from 9 passes through the condenser 21, the expansion device 23, and the evaporator 17, and returns to the compressor 19 to form a refrigeration cycle.

Although the number of evaporators 17 is one, it is also possible to provide two evaporators, one for a freezer compartment and the other for a refrigerating compartment.

FIG. 1 shows a concrete example of the spiral compressor 19.

In the closed case 25 of the compressor 1, the suction pipe 2
7 and a discharge pipe 29 are provided respectively, and the suction pipe 27 is connected to the evaporator 17 and the discharge pipe 29 is connected to the condenser 21, respectively. An electric element 31 as a driving means is arranged in substantially the left half of the closed case 25, and a compression element 33 as a compression means is arranged in the right half thereof, and a lubricating oil R is provided on the bottom side of the compression element 33. It is filled up to the liquid level.

The electric element 31 has a stator 35 fixed to the inner surface of the closed case 25 and a rotatable rotor 37 provided inside the stator 35.

One of the main shafts 39 is fixedly connected to the rotor 37, and the other of the main shafts 39 extends into the compression element 33.

The compression element 33 includes a cylinder 41 and a rotating body 4.
3, the cylinder 41 has a shape directly fixed and supported on the inner peripheral surface of the closed case 25.

The rotating body 43 is formed independently of the main shaft 39, has a cylindrical shape smaller than the inner diameter of the cylinder 41, and has a bearing portion 45 at the center.

The bearing portion 45 is fitted and inserted into an eccentric shaft portion 47 formed so as to be eccentric from the axial center of the main shaft 39.

When the main shaft 39 rotates, the rotating body 43 has a ring-shaped Oldham coupling 49 so that a part of the outer peripheral surface of the rotating body 43 makes a line contact with the inner peripheral surface of the cylinder 41 so that the rotating body 43 does not rotate. To be given.

In this embodiment, the main shaft 39 is used to provide the rotating body 43 with a rotating motion without rotation, but the rotating body 4 supported at both ends is used.
It is also possible to use the cylinder 41 side with respect to 3 as means for giving a turning motion without rotation.

On the other hand, a spiral groove 51 is formed along the axial direction on the outer peripheral surface of the rotating body 43, and the maximum pitch of each spiral groove 51 is on the suction pipe 27 side, and thereafter decreases gradually toward the discharge pipe 29 side. Is set. In the spiral groove 51, a spiral blade 5 made of an elastic material such as synthetic resin is used.
3 is attached and retracted freely by utilizing the elastic force. The length of the blade 53 is slightly shorter than the length of the spiral groove 51, and the width thereof is set to be substantially the same as the groove width of the spiral groove 51. The thickness is set to be smaller than the dimension of the spiral groove 51 up to the groove bottom, and it is possible to project and retract (arrow in FIG. 1) in the play allowance area up to the groove bottom.

The outer peripheral surface of the blade 53 is in contact with the inner peripheral surface of the cylinder 41, and the inner peripheral surface of the cylinder 41 and the rotating body 4 are in contact with each other.
The space between the outer peripheral surface of the chamber 3 and the outer peripheral surface of the chamber 3 is partitioned into a plurality of working chambers 55 by the blade 53. Each working chamber 55
It is formed between two adjacent turns of the blade 53.

The volume of the working chamber 55 is set to be maximum on the suction end side (left side in FIG. 1) of the cylinder 41, and gradually decrease toward the discharge end side (right side in FIG. 1).

The first working chamber 55 on the suction end side communicates with the suction pipe 27 through the internal space of the hermetically sealed case 25 through the suction port 57 so that the refrigerant gas can be introduced. The final working chamber 55 on the discharge end side communicates with the discharge port 61 via the discharge passage 59.

The discharge port 61 is covered with a closed space chamber 63 having a predetermined size, and the closed space absorbs sound energy. In the upper part of the closed space chamber 63,
The discharge pipe 29 has a shape in which the discharge pipe port 29a directly faces the compressed gas discharged from the terminal end working chamber 55 and directly discharged into the cycle through the discharge pipe 29. ing.

A partition plate 65 for partitioning the discharge port 61 and the discharge pipe port 29a of the discharge pipe 29 is provided in the closed space chamber 63.

The partition plate 65 is in the form of a curtain whose upper end is fixedly supported by the inner wall surface of the closed space chamber 63, and the lower part thereof is a free space through which gasified compressed gas can freely pass.

0.1 to 0.5 m below the closed space chamber 63
A plurality of m oil-draining holes 67 are provided, and the closed space chamber 6
The inside of 3 and the inside of the closed case 25 communicate with each other through the oil drain hole 67. The oil drain hole 67 is provided when the operation is stopped.
The lubricating oil R is blocked below the liquid surface and is exposed from the liquid surface during operation. However, since the lubricating oil R is blocked by the lubricating oil due to the small hole diameter, the closed space chamber 63 is not hindered. The pressure inside is secured.

On the other hand, the main shaft 39 and each working chamber 5
Lubricating oil R is supplied to the blades 53 that make up 5 by a lubricating oil supply pump 69.

The lubricating oil R filled in the bottom portion of the closed case 25 is sucked up by the lubricating oil supply pump 69, and then passes through a lubricating oil passage 73 provided in the main shaft 39 via a suction pipe passage 71, Is sent to the outer peripheral surface of the rotating main shaft 39 and the Oldham joint 49, and the lubricating oil R sent to the Oldham joint 49 returns to the inside of the sealed case 25 via the Oldham joint passage 75. The other part of the lubricating oil R is sent to the groove bottom of the spiral groove 51 in which the blade 53 is inserted through the communication passage 77.

According to the refrigerator thus constructed, the refrigerant discharged from the compressor 19 is condensed by the condenser 21 and the expansion device 2.
3. A refrigeration cycle that passes through the evaporator 17 and returns to the compressor 19 again is configured. At this time, the cold air that has undergone heat exchange in the evaporator 17 is sent into the inside of the refrigerator, so that the inside of the refrigerator is cooled.

On the other hand, the compressor 19 during the refrigeration cycle operation
Is compressed while the refrigerant taken in from the suction port 57 by the swirling motion of the rotating body 43 without rotation is sequentially transferred from the start end side working chamber 55 to the end side working chamber 55, and is discharged from the discharge port 61 to the discharge pipe 29. It is directly discharged into the cycle toward the condenser 21 via the. At the time of this discharge, the lubricating oil R is discharged from the discharge port 61 together with the compressed gas into the closed space chamber 6
3 is discharged into the inside. At this time, the closed space chamber 63 functions as a sound deadening chamber that absorbs sound energy, and the lubricating oil R having large particles drops downward due to its own weight.
Some of them come into contact with 5 and fall, so that they are reliably separated from the compressed gas.

The separated compressed gas becomes discharge gas, passes through the partition plate 65 and is discharged from the discharge pipe 29 into the cycle, while the lubricating oil R accumulates at the bottom of the closed space chamber 63. The increase in refrigerant flow noise and pulsation noise that accompany the discharge of lubricating oil can be suppressed.

Further, since the lubricating oil R does not stay in the evaporator 17, performance deterioration does not occur, high operating power for covering it is avoided, and energy saving operation becomes possible.

On the other hand, the lubricating oil R accumulated in the closed space chamber 63
Is returned from the oil drain hole 67 to the inside of the closed case 25, so that the lubricating oil R can be circulated and reused.

[0045]

As described above, according to the first aspect of the present invention, the closed space chamber enables the separation of the lubricating oil discharged from the discharge port together with the discharge gas, so that the lubricating oil can be discharged into the cycle. It can be surely prevented from being discharged.
As a result, an increase in refrigerant flow noise and pulsation noise can be suppressed, noise can be reduced, and lubricating oil can be prevented from staying in the evaporator, so that performance reduction does not occur and energy saving operation can be performed.

According to the second aspect of the present invention, the lubricating oil discharged together with the compressed gas from the discharge port hits the partition plate to be reliably separated from the compressed gas, so that the lubricating oil is discharged in the cycle. It is possible to reliably prevent the liquid from being discharged.

[Brief description of drawings]

FIG. 1 is a schematic cut explanatory view of a compressor implemented in a refrigerator according to the present invention.

FIG. 2 is a refrigerant circuit diagram that constitutes a refrigeration cycle of a refrigerator.

FIG. 3 is a schematic side view of a refrigerator.

[Explanation of symbols]

1 refrigerator 17 Evaporator 19 compressor 21 condenser 23 Aperture device 25 sealed case 29 Discharge pipe 29a Discharge pipe port 41 cylinders 43 rotating body 51 spiral groove 53 blade 55 Working room 61 Discharge port 63 closed space room 65 Partition Plate 67 Oil drain hole R lubricating oil

Claims (2)

[Claims] 1. A refrigerator provided with a compressor, a condenser, a throttle device, and an evaporator constituting a refrigeration cycle, wherein the compressor is arranged in a closed case having a suction pipe, and rotational power from a driving means is used. Either one of them is swivel-movable, and a cylinder and a spiral groove with a different pitch provided on the outer circumference of the rotor so that they can be retracted and inserted, and the excluded volume is reduced along the axial direction in the cylinder. A spiral blade that sequentially forms a plurality of different working chambers, a suction port that communicates with the suction pipe through the internal space of the sealed case, a suction port that communicates with the starting end side working chamber, and a communication end with the end side working chamber. A discharge port that fits, a closed space chamber that covers the discharge port, and a discharge pipe that extends and projects directly from the closed space chamber to the outside of the closed case,
A refrigerator characterized in that an oil drain hole communicating with the inside of the closed case is provided in the lower part of the closed space chamber. 2. The refrigerator according to claim 1, wherein the closed space chamber has a partition plate arranged between the discharge port and the discharge pipe port of the discharge pipe.