JP2000320930A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bubbling sound from occurring in an accumulator of a refrigerator. SOLUTION: A slit 14 is provided in the tip end of an insertion tube 13 having an oil return hole 10 connected with an accumulator 6. Hereby, a liquid refrigerant 12 is discharged from the slit 14 and a liquid encapsulated state in the tip end of the insertion tube 13 is eliminated, and the refrigerant is prevented from becoming air bubbles through the oil return hole and from being injected into the liquid refrigerant staying in the accumulator 6, and hence a bubbling sound is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator for reducing a refrigerant flow noise generated in an accumulator.

[0002]

2. Description of the Related Art A refrigerator having an accumulator described in Japanese Patent Application Laid-Open No. 7-280394 is conventionally known.

Hereinafter, the conventional refrigerator will be described with reference to the drawings.

FIG. 8 is a refrigeration cycle diagram of a conventional refrigerator, and FIG. 9 is an enlarged sectional view of a main part of an accumulator section of the conventional refrigerator. In FIG. 8, 1 is a compressor, 2 is a condenser,
Reference numeral 3 denotes a dryer, 4 denotes a capillary tube, 5 denotes an evaporator, 6 denotes an accumulator, 7 denotes a suction pipe, and these are connected by a pipe 8 to form a refrigeration cycle. In FIG. 9, an insertion pipe 9 is inserted into an accumulator 6 connected from an evaporator 5 by a pipe 8, and an oil return hole 10 is provided at the bottom of the insertion pipe 9.

[0005] Regarding the refrigerator configured as described above,
The operation will be described below.

In FIG. 9, the refrigerant in the evaporator 5 during the cooling operation forms a gas-liquid two-layer flow of the gas refrigerant 11 and the unevaporated liquid refrigerant 12 while passing through the insertion pipe 9 to the accumulator 6.
Flows into. At that time, the gas-liquid two-layer refrigerant discharged from the suction pipe 9 is jetted to the inner wall of the accumulator 6 to be gas-liquid separated, and the gas-liquid separated liquid refrigerant 12 stays in the accumulator 6, so that the liquid refrigerant 12 is in a liquid state. It is prevented from being sucked into the compressor 1 via the suction pipe 7. At that time, the refrigerating machine oil is also ejected from the insertion pipe 9 together with the refrigerant, and is returned to the compressor 1 via the suction pipe 7.

The oil return hole 10 provided at the bottom of the insertion pipe 9 prevents the refrigerating machine oil mixed in the liquid refrigerant 12 from staying in the accumulator 6.

When the temperature of the refrigerator reaches a predetermined temperature and the compressor 1 stops, the temperature of the evaporator 5 rises and the pressure rises at the same time as the temperature inside the refrigerator rises, so that the refrigerant is inserted in a gas-liquid two-layer state. It flows into the accumulator 6 via the pipe 9.

[0009]

However, in the above-described conventional configuration, when the cooling operation is stopped, the refrigerant flows into the insertion pipe 9 in a gas-liquid two-layer state, and the tip of the insertion pipe 9 is in a liquid-sealed state by the liquid refrigerant 12. At the moment when the gas refrigerant 11
However, there is a drawback that bubbling sound (sloppy sound) is generated in the accumulator 6 because bubbles are ejected as bubbles into the liquid refrigerant 12 staying in the accumulator 6.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and has as its main object to eliminate the bubbling sound (jumble) generated in the accumulator when the cooling operation is stopped.

Further, in the above-mentioned conventional structure, since the insertion pipe 9, the suction pipe 7 and the pipe center are on the same axis, the liquid refrigerant 12 accumulated in the evaporator 5 immediately after the start of the cooling operation is immediately discharged from the insertion pipe 9. It is ejected, flows into the suction pipe 7 in a liquid state without evaporating, and is sucked into the compressor 1 to cause liquid compression. Also, the insertion pipe 9 vibrates due to the kinetic energy of the refrigerant and the resonance sound in the accumulator 6. And that the refrigerant spouted from the insertion tube 9 hits the inner wall of the accumulator 6 to generate a collision sound,
Since the refrigerant flows through the insertion pipe 9 at a high speed, the refrigerant has a drawback that the refrigerant flows in the accumulator 6.

Another object of the present invention is to prevent liquid compression and reduce resonance noise, collision noise and refrigerant flow noise generated in the accumulator.

[0013]

According to the present invention, a slit is provided at the distal end of the insertion tube.

Thus, even if the liquid refrigerant moves to the distal end of the insertion tube, the liquid refrigerant is discharged from the slit, so that the insertion tube can be prevented from being in a liquid-sealed state.

Further, the pipe center of the insertion pipe and the suction pipe is eccentrically connected to the accumulator, the tip of the suction pipe is protruded into the accumulator, and an oil return hole is provided at the base of the protruding portion. Even if a large amount of liquid refrigerant is ejected from the insertion pipe immediately after the start of operation, the liquid refrigerant flows out toward the inner wall of the accumulator and does not flow into the suction pipe, so that liquid compression can be prevented, and
The refrigerating machine oil ejected together with the liquid refrigerant travels along the inner wall of the accumulator and returns from the oil return hole of the suction pipe to the compressor via the suction pipe, so that a sufficient amount of oil in the compressor can be secured.

Further, a semicircular groove is provided on the inner wall of the accumulator, and the insertion tube is inserted and connected along the groove, so that the insertion tube is fixed in the accumulator. Generation can be prevented.

Further, the configuration in which the portion of the inner surface of the accumulator opposite to the insertion tube is formed in a conical shape, so that the refrigerant ejected from the insertion tube first strikes the conical portion.
It is possible to prevent the generation of a collision sound generated when the refrigerant directly collides with the inner wall surface of the accumulator.

Further, by providing a constricted portion near the connecting portion of the insertion tube with the accumulator, the flow path resistance of this portion is increased, the flow velocity of the refrigerant is reduced, and the flow noise of the refrigerant generated in the accumulator is reduced. I can do it.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a refrigerator according to the first aspect of the present invention, a compressor, a condenser, a capillary, an evaporator, an accumulator, and a suction pipe are sequentially connected to form a cooling system, and oil is returned into the accumulator. An insertion tube having a hole is connected, and a slit is provided at the end of the insertion tube that opens into the accumulator. Even if the liquid refrigerant moves to the end of the insertion tube, it is discharged from the slit. Will not be in a liquid-sealed state. Thus, when the cooling operation is stopped, the gas refrigerant does not blow out from the oil return hole of the insertion pipe into the liquid refrigerant in the accumulator, and it is possible to prevent the generation of the bubbling sound (sloppy sound).

Further, the refrigerator according to claim 2 of the present invention comprises:
The insertion pipe and the suction pipe are connected to an accumulator with their respective pipe centers eccentric, and the tip of the suction pipe is projected into the accumulator, and an oil return hole is provided at the base of the projection. Thus, even if a large amount of liquid refrigerant is ejected from the insertion pipe immediately after the start of the cooling operation, the liquid refrigerant flows out toward the inner wall of the accumulator and does not flow into the suction pipe, so that liquid compression can be prevented, and
The refrigerating machine oil ejected together with the liquid refrigerant travels along the inner wall of the accumulator and returns from the oil return hole of the suction pipe to the compressor via the suction pipe, so that a sufficient amount of oil in the compressor can be secured.

Further, the refrigerator according to claim 3 of the present invention comprises:
The accumulator inner wall is provided with a semicircular groove having a cross section substantially the same width as the outer diameter of the insertion tube, and the insertion tube is inserted and connected along the groove, and the insertion tube is inserted in the accumulator. Since it is fixed, it is possible to prevent the generation of resonance due to the vibration of the insertion tube.

Further, the refrigerator according to claim 4 of the present invention comprises:
The portion of the inner surface of the accumulator opposite to the tip of the insertion tube is formed in a conical shape, and the refrigerant ejected from the insertion tube first strikes the conical portion, so that the collision sound generated when the refrigerant directly collides with the inner wall surface of the accumulator. Can be prevented.

Further, the refrigerator according to claim 5 of the present invention comprises:
A constriction is provided in the vicinity of the connection between the insertion tube and the accumulator, and the constriction increases the flow path resistance, reduces the flow velocity of the refrigerant, and reduces the flow noise of the refrigerant generated in the accumulator.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 1) FIG. 1 is an enlarged sectional view of an essential part of an accumulator section of a refrigerator according to Embodiment 1 of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of the distal end portion of the insertion tube of the embodiment.

In FIGS. 1 and 2, reference numeral 13 denotes an insertion pipe which is inserted from the evaporator 5 into the accumulator 6 connected by the pipe 8, and has a slit 14 at the tip and an oil return hole 10 at the bottom. Provided.

With respect to the refrigerator configured as described above,
The operation will be described below.

In FIG. 1, during the cooling operation, the same operation as the conventional refrigerator is exhibited. And when the cooling operation is stopped,
As the temperature of the evaporator 5 rises, the pressure also rises at the same time, and the refrigerant flows into the accumulator 6 through the insertion pipe 13 in a gas-liquid two-layer state, but the liquid refrigerant 12 is discharged from the slit 14 into the accumulator 6. Therefore, the distal end of the insertion tube 13 is not liquid-sealed by the liquid refrigerant 12. Therefore, the gas refrigerant 11 flows out of the distal end portion of the insertion pipe 13 into the accumulator 6 and does not flow out into the liquid refrigerant 12 staying in the accumulator 6 as bubbles, so that the bubbling noise generated in the accumulator 6 is eliminated. (Jumbled sound) can be prevented.

(Embodiment 2) FIG. 3 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to Embodiment 2 of the present invention. The components having the same configuration as in the first embodiment are denoted by the same reference numerals, detailed description is omitted, and configurations and operations different from those in the first embodiment will be described.

In FIG. 3, reference numeral 15 denotes an accumulator, which connects the insertion tube 13 having the slit 14 at the tip and the suction tube 7 so that their respective pipe centers are eccentric. Reference numeral 7-2 denotes a suction pipe, the tip of which is connected so as to protrude into the accumulator 15, and an oil return hole 16 is provided at the base of this protruding portion.

With respect to the refrigerator configured as described above,
The operation will be described below.

When the cooling operation is stopped, the liquid refrigerant 1 is stored in the evaporator 5.
2 is retained, but immediately after the start of the cooling operation, the liquid refrigerant 1
2 at a stroke from the tip of the insertion tube 13 to the accumulator 15
The liquid refrigerant 12 that has jetted out once hits the inner wall surface of the accumulator 15, evaporates, and then flows into the liquid suction pipe 7, so that there is no liquid back to the compressor 1. The refrigerating machine oil jetted out together with the liquid refrigerant 12 travels along the inner wall of the accumulator 15 and is returned to the compressor 1 through the oil return hole 16 provided at the base of the protrusion of the suction pipe 7-2 via the suction pipe 7-2. . Therefore, in addition to the refrigerator of the first embodiment, the refrigerator of the second embodiment can ensure that the refrigerating machine oil returns to the compressor 1 while preventing liquid back that occurs immediately after the start of operation.

(Embodiment 3) FIG. 4 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to Embodiment 3 of the present invention.
FIG. 2 is a horizontal sectional view of the accumulator of the embodiment. The components having the same configurations as those of the first and second embodiments are denoted by the same reference numerals, detailed description thereof will be omitted, and configurations and operations different from those of the first and second embodiments will be described.

In FIGS. 4 and 5, reference numeral 17 denotes an accumulator, and a semicircular groove 18 having a width substantially equal to the outer diameter (D) of the insertion tube 13 is provided on the inner wall thereof. The insertion tube 13 is provided along the groove 18 with the accumulator 17.
Is inserted and connected.

With respect to the refrigerator configured as described above,
The operation will be described below.

During the cooling operation, the refrigerant flows into the insertion pipe 13 at a high flow rate. However, since the insertion pipe 13 is inserted into the accumulator 17 along the groove 18 and fixed, the kinetic energy of the refrigerant causes It will not vibrate.
Therefore, the refrigerator of the third embodiment can prevent the resonance sound in the accumulator 17 due to the vibration of the insertion tube 13 during the cooling operation in addition to the refrigerator of the second embodiment.

(Embodiment 4) FIG. 6 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to Embodiment 4 of the present invention. The components having the same configurations as those of the first, second, and third embodiments are denoted by the same reference numerals, and detailed descriptions thereof are omitted. The configurations and operations different from those of the first, second, and third embodiments are described. Is described.

In FIG. 6, reference numeral 19 denotes an accumulator, in which the insertion tube 13 is inserted along the groove 18, and
Convex part 2 formed in a conical shape at a portion facing the tip of 3
It has 0.

With respect to the refrigerator configured as described above,
The operation will be described below.

During the cooling operation, the refrigerant flows into the insertion tube 13 at a high flow rate, and blows out from the tip toward the inner wall of the accumulator 19. At this time, a portion facing the distal end of the insertion tube 13 is provided with a conical convex portion 20.
The jetted refrigerant once collides with the convex portion 20 and then flows along the inner wall surface of the accumulator 19. Therefore, Example 4
The refrigerator of the third embodiment can be added to the refrigerator of the third embodiment to reduce the collision noise of the refrigerant in the accumulator 20 during the cooling operation.

(Embodiment 5) FIG. 7 is an enlarged view of a main part of an accumulator section of a refrigerator according to Embodiment 5 of the present invention. The same components as those of the first, second, third, and fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. A configuration and operation different from the fourth embodiment will be described.

Reference numeral 21 denotes an insertion pipe, which is connected to the pipe 8 from the evaporator 5.
Is inserted into the accumulator 19 connected by
As in the first to fourth embodiments, a slit 1
4. An oil return hole 10 is provided at the bottom, and a constriction 22 is provided near the connection with the accumulator 19 in addition.

With respect to the refrigerator configured as described above,
The operation will be described below.

During the cooling operation, the refrigerant flows through the insertion pipe 21 at a high flow rate, but is subjected to resistance by the constricted portion 22 and flows into the accumulator 19 at a low flow rate. Therefore, in addition to the refrigerator of the fourth embodiment, the refrigerator of the fifth embodiment can reduce the refrigerant flow noise generated in the accumulator 19.

[0045]

As described above, the present invention provides a compressor,
A condenser, a capillary, an evaporator, an accumulator, and a suction pipe are sequentially connected to form a cooling system. An insertion pipe having an oil return hole is connected to the inside of the accumulator, and a tip of the insertion pipe which is opened into the accumulator is provided. Since the slit is provided, even if the liquid refrigerant moves to the tip of the insertion tube, the liquid refrigerant is discharged from the slit, so that the insertion tube does not enter the liquid sealing state. Thus, when the cooling operation is stopped, the gas refrigerant does not blow out from the oil return hole of the insertion pipe into the liquid refrigerant in the accumulator, and it is possible to prevent the generation of the bubbling sound (sloppy sound).

Further, the insertion pipe and the suction pipe are connected to an accumulator with their respective pipe centers eccentric, the tip of the suction pipe is projected into the accumulator, and an oil return hole is provided at the base of the projection. Therefore, even if a large amount of liquid refrigerant is ejected from the insertion pipe immediately after the start of the cooling operation, the liquid refrigerant flows out toward the inner wall of the accumulator and does not flow into the suction pipe. The refrigerating machine oil ejected together travels along the inner wall of the accumulator and returns from the oil return hole of the suction pipe to the compressor via the suction pipe, so that a sufficient amount of oil in the compressor can be secured.

Further, a semi-circular groove having a cross section substantially the same width as the outer diameter of the insertion tube is provided on the inner wall of the accumulator, and the insertion tube is inserted and connected along the groove to form an insertion tube. Is fixed in the accumulator, so that the generation of resonance due to the vibration of the insertion tube can be prevented.

Further, since the portion of the inner surface of the accumulator opposite to the tip of the insertion tube is formed into a conical shape, the refrigerant ejected from the insertion tube first strikes the conical portion, so that the refrigerant directly collides with the inner wall surface of the accumulator. The generated collision noise can be reduced.

Further, by providing a constricted portion near the connection portion of the insertion tube with the accumulator, the constricted portion increases the flow path resistance, reduces the flow velocity of the refrigerant, and reduces the flow noise of the refrigerant generated in the accumulator. Can be done.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a distal end portion of the insertion tube of the embodiment.

FIG. 3 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of an accumulator of a refrigerator according to a third embodiment of the present invention.

FIG. 5 is a horizontal sectional view of the accumulator section of the embodiment.

FIG. 6 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part of an accumulator section of a refrigerator according to a fifth embodiment of the present invention.

FIG. 8 is a refrigeration cycle diagram of a conventional refrigerator.

FIG. 9 is an enlarged sectional view of a main part of an accumulator section of a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Dryer 4 Capillary tube 5 Evaporator 6,15,17,19 Accumulator 7,7-2 Suction pipe 10,16 Oil return hole 13,21 Insertion pipe 14 Slit 18 Groove 20 Convex part 22 Constriction part

Claims (5)

[Claims] A cooling system is constructed by sequentially connecting a compressor, a condenser, a capillary, an evaporator, an accumulator, and a suction pipe. An insertion pipe having an oil return hole is connected in the accumulator, and the insertion pipe is connected to the cooling pipe. A refrigerator characterized in that a slit is provided at a tip end opening into an accumulator. 2. The insertion pipe and the suction pipe are connected to an accumulator with their respective pipe centers eccentric, and the tip of the suction pipe is projected into the accumulator, and an oil return hole is provided at the base of the projection. The refrigerator according to claim 1, characterized in that: 3. The accumulator has an inner wall provided with a semicircular groove having a cross section substantially equal in width to the outer diameter of the insertion tube, and the insertion tube is inserted and connected along the groove. 2. The refrigerator according to 2. 4. The refrigerator according to claim 3, wherein a portion of the inner surface of the accumulator facing the tip of the insertion tube is formed in a conical shape. 5. The refrigerator according to claim 4, wherein a constricted portion is provided in the vicinity of a connection portion of the insertion tube with the accumulator.