JP2001012827A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the oil sucking force of an oil returning hole so as to increase the returning mount of oil to a compressor by bending a leading-out pipe provided in a container on the bottom side of the container and forming a recess which reduces the cross-sectional area of the pipe at the bent section, and then, forming the oil returning hole in the recess. SOLUTION: In the container 4 of an accumulator 1, a leading-in pipe 5 for leading in a refrigerant, a leading-out pipe 6 for discharging a gas, and a desiccating agent 8 are provided. The leading-out pipe 6 is bent in a U-shape on the bottom side of the container 4 and the front end of the pipe 6 has an opened introducing port 9 and positioned in the upper part of the container 4. A recess 10 is formed near the bottom section of the pipe 6 and an oil returning hole 11 is provided at the center of the recess 10. The recess 10 is formed by deforming the pipe 6 inward so as to reduce the cross-sectional area of the flow passage formed of the pipe 6. Consequently, the flow velocity of the refrigerant passing near by the recess 10 becomes faster and a Venturi effect occurs in the hole 11. Therefore, the hole 11 sucks the oil accumulated in the lower part of the separated container 4 and a sufficient amount of oil is returned to a compressor even when the flow velocity is the lowest.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator used for an air conditioner or a refrigeration system.

[0002]

2. Description of the Related Art Conventionally, accumulators are used in refrigeration circuits such as air conditioners and refrigeration systems. In this accumulator, there is a type in which the liquid refrigerant is vaporized and returned to the compressor. However, oil (refrigeration oil) flows together with the refrigerant, and the oil is separated along with gasification. If the oil has a specific gravity greater than that of the refrigerant, the oil is separated downward. And accumulate.

If the oil is stored in the accumulator, the amount of oil flowing in the refrigeration circuit decreases, causing a problem of burning of the compressor. As a countermeasure, a device for returning the oil has been considered. For example,
If the specific gravity of the refrigerating machine oil (oil) is greater than that of the refrigerant, as disclosed in Japanese Patent Application Laid-Open No. H10-160292, an oil return hole 27 is opened in the lower part of the refrigerant outlet pipe 25 to cope with the problem.

When the specific gravity of the refrigerating machine oil (oil) is smaller than that of the refrigerant, as shown in Japanese Patent Application Laid-Open No. H10-160293, a plurality of oil return holes 27a. 27d is formed to be larger than the oil return hole at the bottom, which is larger than the oil return hole at the top.

[0005]

As described above, an oil return hole is formed in the refrigerant outlet pipe for returning the oil, and the oil suction action is positively provided without processing the outlet pipe or the like. When the amount of the return refrigerant is reduced, the amount of the refrigerant sucked into the outlet pipe from the oil return hole is reduced, and a state in which the compressor runs short of oil occurs.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to increase the suction effect on an oil return hole in order to secure an amount of oil return.

[0007]

An accumulator according to the present invention is provided with an inlet pipe through which a refrigerant flows into a container, and an outlet pipe through which a refrigerant gas flows. The outlet pipe is bent at the bottom side of the container. A dent for reducing the cross-sectional area is formed in the outlet pipe at the portion, and an oil return hole is formed in the dent (claim 1). The dent is reduced by 20% to 60% of the cross-sectional area of the outlet pipe. As a result, the cross-sectional area of the outlet pipe is smaller than that of the other pipes due to the dent, and a Venturi effect occurs due to the refrigerant passing through the oil return hole, the suction force in the oil return hole increases, and the oil to the compressor is increased. Return is good.

[0008] The accumulator according to the present invention comprises:
An introduction pipe through which the refrigerant flows into the container, and an outlet pipe from which the refrigerant gas flows out, are provided, and the outlet pipe is bent at the bottom side of the container, forming a dent that reduces the cross-sectional area of the outlet pipe at the bent portion, An oil return hole is formed downstream of the dent (claim 2). The oil return hole is formed within 30 mm from the dent (claim 4). As a result, the suction force in the oil return hole increases due to the winding action of the separation vortex on the downstream side of the depression of the outlet pipe, and the oil returns to the compressor well.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, the accumulator 1
Are provided in the container 4, a container 4 having a bottomed cylindrical body 2 and a lid 3, an introduction pipe 5 for guiding a refrigerant into the container 4, a discharge pipe 6 for discharging gas from the inside of the container 4. Baffle plate 7 and desiccant 8.

The outlet pipe 6 is bent in a U-shape on the bottom side, and its tip is disposed upward, and the baffle plate 7
And has an inlet 9 which is open to the vicinity of. A recess 10 is formed near the bottom side of the outlet pipe 6,
An oil return hole 11 is formed in the center of the dent 10.

That is, the dent 10 is deformed inside the pipe, thereby reducing the cross-sectional area of the flow path. This state is shown in FIG. 2, for example, when a pipe having a diameter of 19 mm is indented inward by about 8 to 9 mm, and a pipe having a diameter of
The oil return hole 11 of about mm is opened. That is, the dent 10 is reduced by approximately 40% with respect to the cross-sectional area of the flow path of the pipe. However, if the dent 10 is within the range of 20% to 60%, the following operation and effect can be obtained.

The dent 10 and the oil return hole 1 as described above.
The position 1 is near the bent side of the bottom of the outlet pipe 6 and near the position where the flow velocity is high, and is within a range where the suction effect can be enhanced.

In such a configuration, the cross-sectional area of the outlet pipe 6 of the container 4 is reduced by the recess 10,
The flow rate of the refrigerant passing therethrough increases, thereby generating a Venturi effect in the oil return hole 11. Therefore, even when the flow rate of the refrigerant is the lowest, the oil separated and accumulated in the lower part of the container 4 is sucked, and a sufficient amount is returned to the compressor.

FIG. 3 shows a second embodiment of the present invention, in which an oil return hole 11 ′ is formed downstream of the recess 10 of the outlet pipe 6. This oil return hole 1
In the embodiment described above, 1 'has a formation range dimension A of 30 mm or less. Oil return hole 1 with this configuration
1 'also shows an improvement in the suction force, which is mainly due to the effect of entrainment by the separation vortex.

[0016]

As described above, according to the present invention, the suction force in the oil return hole is significantly improved from the dent, and sufficient oil is sucked even when the flow of the refrigerant is the lowest, and the compressor is connected via the outlet pipe. Is returned to
This prevents problems caused by insufficient oil in the compressor and improves the reliability of the compressor.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same outlet pipe.

FIG. 3 shows an embodiment of the present invention and is an enlarged sectional view of a lead-out pipe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 accumulator 2 bottomed cylindrical body 3 lid 4 container 5 introduction pipe 6 outlet pipe 7 baffle plate 8 desiccant 9 introduction port 10 dent 11 oil return hole

Continued on the front page (72) Inventor Kazuhisa Kochi 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama Prefecture Inside of Zexel Konan Plant

Claims (4)

[Claims] 1. An introduction pipe through which a refrigerant flows into a container,
An outlet pipe through which the refrigerant gas flows is provided, and the outlet pipe is bent at the bottom side of the container, and at the bent portion, a recess is formed in the outlet pipe to reduce the cross-sectional area, and an oil return hole is formed in the recess. The accumulator characterized by the above. 2. The accumulator according to claim 1, wherein the depression is reduced by 20% to 60% of the cross-sectional area of the outlet pipe. 3. An introduction pipe through which a refrigerant flows into the container,
An outlet pipe through which the refrigerant gas flows is provided, and the outlet pipe is bent at the bottom side of the container, and at the bent portion, a recess is formed in the outlet pipe to reduce the cross-sectional area, and an oil return hole is provided downstream of the recess. An accumulator characterized by being formed. 4. The accumulator according to claim 3, wherein the oil return hole is formed within 30 mm from the dent.