JP4015535B2 - Centrifugal oil separator and refrigerant device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal oil separator applied to an air conditioner, a refrigeration apparatus, and the like.
[0002]
[Prior art]
A centrifugal oil separator of a conventional refrigeration system has a gas outlet pipe installed vertically through the center of the ceiling wall of a vertically installed sealed container, and its lower end suction port faces downward in the center of the container. It is open. On the other hand, a gas inflow pipe penetrating above the side wall of the container is attached horizontally, and its inflow port is opened toward the tangential direction adjacent to the inner surface of the side wall of the container. An oil return pipe is connected to the peripheral edge of the bottom wall of the container.
[0003]
In this centrifugal oil separator, when the gas refrigerant discharged from the compressor is introduced into the sealed container through the gas inflow pipe, the gas refrigerant descends while swirling along the inner surface of the side wall of the sealed container. Then, the mist-like lubricating oil contained in the gas refrigerant adheres to and separates from the inner surface of the side wall, flows down along the inner surface of the side wall, and is stored in the bottom of the container. Furthermore, a strainer is provided at the end of the outflow pipe to prevent the mist-like lubricating oil from flowing out of the gas outflow pipe along the flow of the gas refrigerant (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 08-110128
[Problems to be solved by the invention]
Although the inlet pipe of the conventional centrifugal oil separator is installed in the horizontal direction from the side wall surface of the container, the pressure-resistant structure in the container is not mentioned. For example, when the inlet pipe is inserted into the side surface of the container and joined by brazing welding with line contact between the end surface of the through hole of the container and the side surface of the inlet pipe, the container breaking pressure is about 6 to 8 MPa, and the fracture is the brazed portion of the insertion port. It was experimentally confirmed that it was generated by cracking.
[0006]
With the R22 refrigerant and R407C refrigerant with low operating pressure, it may be possible to ensure pressure resistance by increasing the vessel wall thickness even with the above-mentioned centrifugal oil separator with fixed line contact in the inlet pipe. There is a problem that it cannot be applied to an air conditioner or a refrigeration apparatus that uses a refrigerant that requires a pressure resistance of 10 MPa or more, such as R410A, R32, and CO2, which are high-pressure refrigerants.
[0007]
For example, when the R410A refrigerant is used, it is necessary to ensure that the breaking pressure of the centrifugal oil separator or the like is at least 13 MPa.
[0008]
In addition, it is technically difficult to set up burring on the cylindrical side surface of the container. This is because when inserting the inlet tube into the side of the container, the insertion direction is not the central direction when viewed from the top of the container, so even if the sectional shape of the inlet tube is circular, the hole shape that opens in the inlet on the side of the container is not circular. Absent. Rather it is close to the lacrimal gland shape. Therefore, it is difficult to make a burring of equal height around the hole.
[0009]
An object of this invention is to provide the centrifugal oil separator which can be mounted in the air conditioning apparatus and refrigeration apparatus which use a high pressure refrigerant | coolant, and the manufacturing method of a centrifugal oil separator. It is another object of the present invention to provide a refrigerant device equipped with a high pressure-resistant centrifugal oil separator.
[0010]
[Means for Solving the Problems]
The centrifugal oil separator according to the present invention is provided with a substantially cylindrical container main body and a horizontal upper portion on the side surface of the container main body, and the inlet to the container main body is close to the inner surface of the side wall of the container main body and tangent thereto. The inlet pipe into which the gas refrigerant flows in, the outlet pipe provided at the upper part of the container body, the outlet pipe through which the gas refrigerant flows out, and the oil separated from the gas refrigerant are externally provided. The oil return pipe, the flat part formed on the upper surface of the container body where the container body and the inlet pipe intersect, the circular inlet pipe insertion hole formed in the flat part, and the inlet pipe insertion hole edge And a burring of uniform height formed outward.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
1 to 6 are diagrams showing Embodiment 1, FIG. 1 is an overall configuration diagram of a centrifugal oil separator, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 3 is a cross-sectional view of the tube insertion portion, FIG. 3 is a configuration diagram of the inlet pipe of the centrifugal oil separator and the flat portion of the side surface of the container, FIG. 4 is a top view of the flat portion of the side surface of the centrifugal oil separator, and FIG. 4 is a cross-sectional view taken along the line B-B of FIG. 4, and is a cross-sectional view of the flat portion of the side surface of the centrifugal oil separator, and FIG. 6 is an enlarged view of the flat portion of the inlet pipe and the side surface of the centrifugal oil separator. is there.
[0012]
As shown in FIG. 1, the centrifugal oil separator has a container body 1 that has an inlet pipe 2 that introduces gas refrigerant discharged from the compressor into the container body 1 and a central portion at the upper end of the container body 1. An outlet pipe 3 from which gas attached through the gas flows out and an oil return pipe 4 connected to the lower end of the container body 1 are attached. The side surface of the container to which the inlet pipe 2 is attached is a flat part 5, and a circular inlet pipe insertion hole 6 is provided in the flat part 5, and a burring 7 is formed around the inlet pipe insertion hole 6 toward the outside of the side surface of the container. Is formed.
[0013]
As shown in FIG. 2, the peripheral portion of the cylindrical side surface portion of the container where the inlet tube 2 and the container body 1 intersect is a flat flat portion 5, and the circular inlet tube through which the inlet tube 2 is inserted. A burring 7 having a height of several millimeters is erected around the insertion hole 6 and the circular inlet pipe insertion hole 6.
[0014]
As shown in FIGS. 3 to 5, the inlet pipe insertion hole 6 is provided in the flat portion 5 and is circular. The burring 7 is provided in the flat portion 5 and is formed around the inlet tube insertion hole 6 with a height of several millimeters toward the outside of the container side surface.
The outer side surface of the inlet pipe 2 and the burring 7 are configured to be in surface contact.
[0015]
Further, as shown in FIG. 6, the brazing material 8 enters the gap between the inlet pipe 2 and the burring 7 and is welded.
[0016]
Next, the oil separation operation will be described.
A high-temperature high-pressure gas refrigerant mixed with refrigerating machine oil is introduced into the container body 1 in the horizontal direction via the inlet pipe 2. The introduced gas refrigerant descends while turning along the inner surface of the side wall of the container body 1. At that time, the mist-like refrigerating machine oil contained in the gas refrigerant adheres to and is separated from the inner surface of the side wall of the container body 1 and then flows down along the inner surface of the side wall of the container to the oil return pipe 4 via the bottom of the container body 1. And circulate.
[0017]
The upper limit of the height of the burring 7 is determined by the thickness of the container body 1. Since the burring 7 is formed by pulling the side surface around the hole, the local wall thickness of the container body 1 is reduced when the height of the burring is increased. In order to ensure the pressure resistance of the container body 1, it is necessary to ensure a predetermined management value of the local thickness, and this uniquely determines the burring height.
[0018]
The container body 1 and the inlet pipe 2 are fixed by welding by brazing. The inlet pipe 2 is inserted into the inlet pipe insertion hole 6 opened in the side flat portion 5 of the container body 1. At this time, the outer side surface of the inlet pipe 2 and the inner surface of the burring 7 are in surface contact, and the brazing material 8 is poured into the gap from the outside as shown in FIG. 6 and the outer portion is covered and fixed by welding. The pressure contact performance of the portion that is in surface contact is increased.
[0019]
Briefly explain the points of brazing for surface contact. In brazing, a molten solder is welded using a flux between brazing parts, and the adhesive force and the resistance to shearing are given. Therefore, it is important to take a sufficient bonding area and to take an appropriate gap.
[0020]
“Advanced Standard Text Refrigeration and Air Conditioning Technology” (Edited by Japan Society of Refrigeration and Air Conditioning) 129 and Table 9.4 show appropriate fitting depth and gap for each pipe diameter. It can be seen that when the tube diameter is 10 mm, it is preferable to secure a depth of fitting of 7 mm or more and a gap of 0.05 to 0.21 mm.
[0021]
The container pressure resistance experiment with and without the burring 7 is performed, and the container specifications, experimental conditions, and experimental results used in this experiment are summarized below.
-Centrifugal oil separator specification container: outer diameter 45mm, wall thickness 1.2mm, length 240mm
Inlet pipe: outside diameter 9.52mm, wall thickness 0.8mm
Outlet pipe: outer diameter 12.7mm, wall thickness 0.8mm, container and 6mm length surface contact oil return pipe: outer diameter 6mm, wall thickness 0.7mm, container and length 6mm surface contact Filled with water, measured the pressure at the time of destruction by increasing the water pressure. No experimental burring: 6-8MPa
With burring: 13.7 MPa
As described above, the effect of burring was experimentally verified.
[0022]
Needless to say, the pressure resistance is improved if the outlet pipe 3 and the oil return pipe 4 are welded and fixed so as to be in surface contact with the container body 1 as shown in FIG.
[0023]
Here, the manufacturing procedure of the centrifugal oil separator in the present embodiment will be described.
First, a cylindrical raw pipe (for example, a copper pipe) that becomes the container body 1 is cut into a predetermined length, and the inside and the outside thereof are cleaned.
Next, the upper side of the container body 1 (the side to which the outlet pipe 3 is connected) is thinned to the outer dimensions of the outlet pipe 3 by drawing.
Thereafter, the position where the inlet pipe 2 on the side surface portion of the container main body 1 is inserted and penetrated is plastically deformed by a press machine so that the flat portion 5 is formed. Then, an inlet pipe insertion hole 6 is opened at a predetermined position of the formed flat portion 5 and burring is performed, and deburring processing is performed at the end of the burring 7.
Next, the lower side of the container body 1 (the side to which the oil return pipe 4 is connected) is formed into a predetermined shape by drawing. Finally, the inlet pipe 2, the outlet pipe 3 and the oil return pipe 4 are attached to the container body 1 in this order and fixed by brazing, and the centrifugal oil separator is formed and assembled.
[0024]
As a result, all of the inlet pipe 2, outlet pipe 3 and oil return pipe 4 that are inserted into and fixed to the container body 1 are attached to the burringed holes so that sufficient surface contact is maintained, so that the centrifugal oil separator The internal pressure resistance can be improved, and it can be widely used in a refrigerant apparatus using a refrigerant having a high operating pressure.
[0025]
In the present embodiment, all high-pressure refrigerants are applicable regardless of the type of refrigerant. Specific examples include R410A refrigerant, R32 refrigerant, CO2 refrigerant, and natural refrigerant.
[0026]
As described above, according to the present embodiment, the inlet pipe 2 is horizontally provided at the upper side and the end of the container body 1, the outlet pipe 3 is vertically disposed at the upper part of the container body 1, and the oil is disposed at the lower part of the container body 1. The return pipe 4 is installed, and the high-pressure high-temperature gas refrigerant mixed with the mist refrigerator oil introduced into the container main body 1 is swung along the inner wall of the container main body 1 to separate the oil by centrifugal force onto the wall surface. In the centrifugal-type centrifugal oil separator to be attached, the side surface of the container body 1 where the inlet pipe 2 and the container body 1 intersect is flattened, and the circular inlet pipe insertion hole 6 and the hole are formed in the flat part 5. By forming the burring 7 outward in the periphery, it is possible to provide a centrifugal oil separator that can be mounted on an air conditioner using a high-pressure refrigerant or a refrigerant device of a refrigeration apparatus.
[0027]
【The invention's effect】
In the centrifugal oil separator according to the present invention, a flat portion is formed on the upper surface of the side surface of the container main body where the container main body and the inlet pipe intersect, and a circular inlet pipe insertion hole is formed in the flat portion to insert the inlet pipe. By forming a burring with an equal height toward the outside at the hole edge, the outer peripheral surface of the inlet pipe and the inner surface of the burring are in surface contact, and the pressure contact performance of the surface contacted portion is increased. A centrifugal oil separator that can be mounted on the used air conditioner or refrigeration apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment, and is an overall configuration diagram of a centrifugal oil separator.
FIG. 2 is a diagram showing the first embodiment, and is a cross-sectional view taken along line AA of FIG. 1;
FIG. 3 is a diagram showing the first embodiment, and is a configuration diagram of an inlet pipe of a centrifugal oil separator and a flat portion on a side surface of a container.
FIG. 4 is a diagram showing the first embodiment and is a top view of a flat portion on a side surface of a container of a centrifugal oil separator.
5 is a diagram showing the first embodiment, and is a cross-sectional view taken along the line BB in FIG. 4. FIG.
FIG. 6 shows the first embodiment, and is an enlarged view of the inlet pipe of the centrifugal oil separator and the flat portion on the side surface of the container.
[Explanation of symbols]
1 Container body, 2 inlet pipe, 3 outlet pipe, 4 oil return pipe, 5 flat part, 6 inlet pipe insertion hole, 7 burring, 8 brazing material.

Claims (6)

A substantially cylindrical container body;
An inlet pipe provided in a horizontal direction at an upper portion of the side surface of the container main body, an inlet to the container main body is opened toward a tangential direction adjacent to an inner wall of the container main body, and a gas refrigerant flows;
An outlet pipe provided at an upper portion of the container body and from which a gas refrigerant flows out;
An oil return pipe provided at the lower portion of the container body and returning the oil separated from the gas refrigerant to the outside;
A flat portion formed on the upper surface of the container body side surface where the container body and the inlet pipe intersect;
A circular inlet tube insertion hole formed in the flat portion;
An equal height burring formed outwardly at the edge of the inlet tube insertion hole;
A centrifugal oil separator characterized by comprising:   The centrifugal oil separator according to claim 1, wherein the burring inner surface of the inlet pipe insertion hole and the outer peripheral surface of the inlet pipe are brought into surface contact and fixed by welding.   The centrifuge according to claim 2, wherein the inner surface of the burring of the inlet pipe insertion hole and the outer peripheral surface of the inlet pipe are brought into surface contact, and the brazing material is poured into the gap from the outside and the outer portion is covered and fixed by welding. Separable oil separator.   The upper and lower parts of the container body are formed into a predetermined shape by drawing, and the outer peripheral surfaces of the outlet pipe and the oil return pipe are brought into surface contact with the inner surfaces of the upper and lower drawn parts of the container body and fixed by welding. The centrifugal oil separator according to claim 1.   A refrigerant apparatus that requires a breakdown pressure of 10 MPa or more, wherein the centrifugal oil separator according to any one of claims 1 to 4 is mounted.   6. The refrigerant device according to claim 5, wherein any one of R410A refrigerant, R32 refrigerant, CO2 refrigerant, natural refrigerant, and the like is used as the refrigerant.

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