JP2009180449A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum accumulator welding structure and welding method capable of reducing welding defects and providing smooth flowing of an in-pipe coolant. <P>SOLUTION: The accumulator is composed of an aluminum-made heat exchanger pipe 4, an aluminum-made accumulator body 1, an aluminum-made inner pipe 3, and a stainless steel-made sleeve 8. In a composition of the sleeve 8, a plurality of protrusion parts 8a abutting on an inner circumference face of the heat exchanger pipe 4 is provided on an outer circumference face. The sleeve 8 is inserted in an outer circumference of an insertion part 5 of the inner pipe 3, the insertion part 5 of the inner pipe 3 is inserted into an inner circumference of the heat exchanger pipe 4 via the sleeve 8, the inner pipe 3 connecting them is inserted into an opening 2 of the accumulator body 1, and a connection part of the heat exchanger pipe 4 is welded. By this, welding defects can be reduced, and a flow of the coolant can be smoothed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an aluminum accumulator constituting a refrigeration cycle in a refrigeration apparatus such as a refrigerator.

  In general, in a heat exchanger used in a refrigerator for home use, the aluminum accumulator and the heat exchanger pipe are welded by inserting a stainless steel sleeve on the inner circumference of the joint of the heat exchanger pipe into the aluminum accumulator. And a heat exchanger pipe made of aluminum, a joining portion of the aluminum material and the aluminum material is formed, and the outer periphery of the abutting portion is welded (see Patent Document 1).

  In recent years, household appliances such as refrigerators have been further reduced in cost, and since the combustible refrigerant is used as the refrigerant used, the heat exchanger that is an internal functional component is also low in cost. There is a demand for improved welding reliability.

  FIG. 8 is a cross-sectional view showing a welded structure of a pipe connecting portion in a conventional aluminum accumulator described in Patent Document 1.

As shown in FIG. 8, conventionally, a heat exchanger pipe 102 through which the refrigerant 101 flows, an aluminum inner pipe 105 attached to the inner periphery of the open end 104 of the aluminum accumulator 103, and a stainless steel In an aluminum pipe welded structure that includes a sleeve 106 and welds the outer periphery of the open end 104, the inner pipe 105 and the heat exchanger pipe 102 are butt-joined via the sleeve 106 to open the open end of the aluminum accumulator 103. Reference numeral 104 denotes a structure in which the sleeve 106 is positioned substantially in the center and the outer periphery of the connecting portion 107 is welded.
Japanese Patent No. 3220866

  However, in the above conventional configuration, since the heat exchanger pipe 102 is butt-joined via the stainless steel rib 106, the amount of aluminum required for welding is small, and the aluminum material such as an aluminum filler rod is used for welding. Supply is required.

  In this case, if the welding skill is low, there is a problem that an appropriate aluminum material cannot be supplied and there are many welding defects.

  Further, since the stainless steel sleeve 106 is difficult to position and the adhesion between the aluminum inner pipe 105 and the heat exchanger pipe 102 is poor, the welding is disengaged due to an impact such as displacement or dropping during welding. There was a problem that there were many defects such as.

  As described above, the welded portion between the aluminums has many welding defects, and it is necessary to rework and remanufacture, making it difficult to reduce the production cost.

  In view of the above, there is a need for a welding structure and a welding method that satisfy both the reduction in welding defects and the smooth flow of refrigerant.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an aluminum accumulator that sufficiently suppresses the occurrence of poor welding in a welded portion and allows a coolant to smoothly flow inside.

  In order to solve the above conventional problems, an accumulator according to the present invention includes an aluminum inner pipe inserted into a stainless steel sleeve, and then the inner pipe and sleeve are connected to the heat exchanger pipe. Insert the heat exchanger piping into the accumulator body from the inner pipe side, and the accumulator body, heat exchanger piping, sleeve and inner pipe are overlapped. The welded part is welded.

  And the said sleeve is set as the structure which provided the some protrusion part which contacts the inner peripheral surface of the said heat exchanger piping in the outer peripheral surface of this sleeve.

  Therefore, the stacked structure of the accumulator main body and the heat exchanger pipe can secure the amount of aluminum necessary for welding and can be welded without reducing the thickness of the aluminum pipe (heat exchanger pipe). As a result, welding work is facilitated, welding defects can be reduced without requiring high welding skills, and production costs can be reduced. Further, the restriction portion provided on the inner pipe facilitates positioning of the sleeve, stabilizes the shape in the pipe after welding, and enables a smooth flow of the refrigerant.

  Furthermore, because of the protrusions provided on the sleeve, the contact between the sleeve and the heat exchanger pipe is intermittent contact, so that the heat transfer to the inner pipe during welding is alleviated, and as a result, deformation due to heat, etc. As a result, the inner pipe, the sleeve, and the heat exchanger pipe fixing structure are stabilized, and the reliability of the welding effect can be improved.

  The present invention provides an aluminum accumulator capable of facilitating welding work, sufficiently reducing welding defects, suppressing the displacement of piping inside the accumulator accompanying welding, and enabling a smooth flow of refrigerant. can do.

  In addition, since the reliability of welding is high, it can be incorporated into a refrigeration apparatus using a flammable refrigerant, and the reliability of the refrigeration apparatus can be improved.

  According to the first aspect of the present invention, there is provided an aluminum accumulator body having an opening for connecting pipes formed at a diameter smaller than a center portion at both ends, and an aluminum heat exchange inserted into one end of the accumulator body. Pipe, stainless steel sleeve inserted into the heat exchanger pipe, and an aluminum inner pipe disposed in the accumulator body and having one end inserted into the heat exchanger pipe via the sleeve The inner pipe is provided with a restriction portion for restricting movement of the sleeve, and a heat exchanger pipe into which the inner pipe is inserted is inserted into the opening of the accumulator body through the sleeve, and the opening The accumulator is welded to the outer peripheral surface of the sleeve and the inner peripheral surface of the heat exchanger pipe. It is provided with a plurality of protrusions.

  With this configuration, the opening of the accumulator main body, which is the welding location, becomes a part where the aluminum heat exchanger piping and the aluminum inner pipe overlap in addition to the aluminum accumulator main body, which is sufficient for the welded portion. A sufficient amount of aluminum can be ensured.

  As a result, the reliability of welding is increased, and an increase in manufacturing cost due to poor welding can be suppressed, and the joint between the tip of the heat exchanger pipe and the inner pipe is a welded part of the accumulator body and the heat exchanger pipe. Since it is located closer to the inside of the accumulator body, it is possible to prevent molten aluminum accompanying welding from flowing out into the accumulator, and to suppress deterioration in quality.

  Furthermore, the restriction part provided on the inner pipe facilitates the positioning of the stainless steel sleeve, so that the fixing structure of the welded inner pipe, sleeve, and heat exchanger pipe is stable, and the shape dimensions are secured. Reliability can be improved, and a smooth flow of the refrigerant can be achieved by stabilizing the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe.

  Further, by providing a plurality of protrusions provided on the outer peripheral surface of the sleeve so as to contact the inner peripheral surface of the heat exchanger pipe, the contact area with the heat exchanger pipe is reduced, and the inner heat of the welding is reduced. Transmission to the pipe is eased. As a result, deformation due to heat is suppressed, the fixing structure of the inner pipe, the sleeve, and the heat exchanger pipe is stabilized, and the reliability of the welding effect can be improved.

  According to a second aspect of the present invention, in the first aspect of the present invention, a tapered portion formed by making the tip of the inner pipe smaller in diameter than the center portion is used as the restricting portion.

  With this configuration, the restricting portion can be formed by a method such as drawing of a pipe, and by using a tapered portion, processing is facilitated, and the sleeve, It is easy to ensure the insertion and fitting with the exchanger pipe, and can suppress the deviation of the insertion and fitting during welding.

  According to a third aspect of the present invention, in the second aspect of the present invention, a flared portion that contacts the tapered surface of the restriction portion is provided on the restriction portion side end surface of the sleeve.

  By adopting such a configuration, the inclined surface of the flare portion serves as a guide when the sleeve is attached to the inner pipe, so that the attachment property of the sleeve to the inner pipe is improved and workability can be improved.

  In addition, due to the flared shape of the flare, even when molten aluminum flows out during welding, the flow can be blocked, resulting in more reliable prevention of outflow into the accumulator body. The quality of the product can be stabilized.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the protruding portion of the sleeve protrudes in the circumferential direction, and the corrugation in which the concave portion is intermittently continued in the axial direction. It is what.

  By adopting such a configuration, since intermittent recesses are located on the outer peripheral surface of the sleeve, even if aluminum melted during welding is eluted, an action of damming the recesses occurs. The clogging of the inner pipe due to the penetration into the inner pipe can be suppressed, and the reliability of the stable flow of the refrigerant can be improved.

  The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the protruding portion of the sleeve is a plurality of hemispherical protrusions protruding from the outer peripheral surface of the sleeve. .

  With such a configuration, the contact area with the heat exchanger pipe is reduced, the transfer of heat to the inner pipe during welding is reduced, and as a result, deformation due to heat and the like can be suppressed, the inner pipe, sleeve, The fixing structure of the heat exchanger pipe can be stabilized and the reliability of the welding effect can be enhanced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a welded portion of an accumulator according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of a stainless steel sleeve according to the first embodiment. FIG. 3 is an enlarged view of a portion A of the sleeve shown in FIG.

  1, 2, and 3, the accumulator body 1 is made of pure aluminum or an aluminum alloy, and is formed into a cylindrical shape by an appropriate processing method. An opening 2 for connecting pipes having a small diameter is provided. Since the specific shape may be a known shape, here, the portions related to the gist of the present invention will be illustrated and described.

  An inner pipe 3 and a heat exchanger pipe (hereinafter referred to as a pipe) 4 are pipe bodies that are connected to each other, and are made of pure aluminum or an aluminum alloy as a material, like the accumulator body 1.

  A connecting end side of the inner pipe 3 with the pipe 4 is formed with a smaller diameter by drawing or the like, and serves as an insertion portion 5 to the pipe 4. Therefore, when the insertion portion 5 is formed, a tapered regulation portion 6 whose diameter gradually decreases is provided on the connection end side.

  Further, the pipe 4 is provided with a contact portion 7 that extends in the radial direction and regulates the insertion allowance into the accumulator body.

  Furthermore, the inner pipe 3 is inserted into the pipe 4 through a stainless steel sleeve 8 that prevents molten aluminum from flowing into the pipe 4 during welding. The sleeve 8 is as shown in FIG. , And is formed of a stainless steel pipe (hereinafter referred to as a stainless steel pipe). On the outer periphery thereof, as shown in FIG. 3, a recess 8a is provided in an annular shape by a processing method such as drawing in the circumferential direction. Has a configuration of a cross-sectional waveform provided intermittently in the axial direction.

  Due to the formation of the concave portion 8a, a protruding portion is formed on the outer peripheral surface of the sleeve 8. In addition, about the stainless steel of the sleeve 8, it is desirable to use an austenite type | system | group from a viewpoint of corrosion.

  Here, the inner diameter of the stainless steel pipe used for the sleeve 8 is set to be substantially equal to the outer diameter of the insertion portion 5 of the inner pipe 3, and the outer diameter is set to be extremely small than the inner diameter of the pipe 4.

  Accordingly, the accumulator is assembled by attaching the sleeve 8 to the insertion portion 5 of the inner pipe 3, connecting the inner pipe 3 to the pipe 4 through the sleeve 8, and inserting the inner pipe 3 into the accumulator body 1. Hereinafter, assembly of the accumulator will be described.

  First, a stainless steel sleeve 8 is attached to the insertion portion 5 of the inner pipe 3. At this time, the sleeve 8 is inserted to a position where the end surface thereof abuts on the restriction portion 6 provided on the inner pipe 3.

  By mounting the sleeve 8, it is possible to suppress the penetration of the molten aluminum material into the insertion portion 5 side during welding.

  In other words, the suppression of permeation of the molten aluminum material into the insertion portion 5 side during welding leads to securing the amount of aluminum during welding, and as a result, reduction of welding defects can be expected.

  Next, the inner pipe 3 fitted with the sleeve 8 is inserted into the inner periphery of the pipe 4. At this time, the pipe 4 is inserted until the tip of the pipe 4 comes into contact with the restricting portion 6 of the inner pipe 3. At this time, since a force is applied so that the sleeve 8 also comes into contact with the restricting portion 6, no displacement occurs.

  In such a state, a contact portion 8b and a separated portion 8c are formed between the inner peripheral surface of the pipe 4 and the outer periphery of the sleeve 8 by a recess 8a formed in the sleeve 8 (FIG. 3).

  Further, the inner pipe 3 and the pipe 4 connected through the sleeve 8 as described above are inserted so that the inner pipe 3 is positioned in the accumulator body 1. The insertion is performed until the contact portion 7 of the pipe 4 contacts the opening 2 of the accumulator body 1.

  And the welding assembly of an accumulator is completed by welding mainly the contact location in the state which the contact part 7 is contact | abutting to the opening part 2 of the accumulator main body 1. FIG.

  In such assembly, the thickness of the aluminum material is ensured by the superposition structure of the accumulator body 1 and the pipe 4 during welding, so that the welding operation can be facilitated, and the reworking or remanufacturing associated with poor welding is possible. Can be reduced. In addition, the use of an aluminum filler rod that is normally used during aluminum welding can be reduced, and a reduction in production cost can be expected.

  In addition, since refrigerant leakage due to poor welding can be reduced, the risk of ignition due to refrigerant leakage when using flammable refrigerants such as isobutane and propane can be reduced, increasing reliability. Is something that can be done.

  Further, in the connection between the inner pipe 3 and the pipe 4 and the insertion of the pipe 4 into the accumulator main body 1, the force acting on the sleeve 8 acts in the direction in which the sleeve 8 abuts against the regulating portion 6 in any case. The displacement of the sleeve 8 during assembly can also be suppressed, and as a result, the fixing structure of the inner pipe 3, the sleeve 8, and the pipe 4 after welding can be stabilized, and the reliability can be improved in securing the dimensions of the shape. In addition, a smooth flow of the refrigerant is possible.

  In other words, the restricting portion 6 provided in the inner pipe 3 restricts the positioning of the sleeve 8 and the insertion allowance of the pipe 4 into the inner pipe 3, so that the inner pipe 3, the sleeve 8, and the pipe 4 can be controlled. It is possible to stabilize the coupling dimensions and the like.

  Further, since the joint between the tip of the pipe 4 and the inner pipe 3 is located closer to the accumulator body 1 than the welded portion of the accumulator body 1 and the pipe 4, the molten aluminum accompanying the welding enters the accumulator body 1. Outflow can also be suppressed, and deterioration in quality can be suppressed.

  Furthermore, the surface of the restricting portion 6 provided on the inner pipe 3 is tapered to facilitate processing, and further, the wedge action by the tapered surface ensures the insertion and fitting with the sleeve 8 and the pipe 4. It is easy to suppress the displacement of insertion and fitting during welding.

  Further, since an annular recess 8 a extending in the circumferential direction is provided on the outer peripheral surface of the sleeve 8, aluminum melted during welding of the contact portion 7 of the pipe 4 and the opening portion 2 of the accumulator body 1 is provided in the sleeve 8. Even if it flows out to the surface, it is blocked by the recess 8a, so that outflow to the inner pipe 3 side is suppressed.

  As a result, the refrigerant flow in the inner pipe 3 is also inhibited from being disturbed by the molten aluminum, and the accumulator can be improved in reliability.

(Embodiment 2)
FIG. 4 is a cross-sectional view of the welded portion of the accumulator in the second embodiment of the present invention. FIG. 5 is a perspective view of a stainless steel sleeve according to the second embodiment. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals, and here, differences from the first embodiment will be mainly described.

  The sleeve 18 is formed of an austenitic stainless steel pipe (hereinafter referred to as a stainless steel pipe), and the basic configuration is similar to the sleeve 8 in the first embodiment, with the concave portion 18a having an environment extending in the circumferential direction. The configuration is provided intermittently in the axial direction, and is different from the first embodiment in that a flare portion 18b is formed at one end thereof so as to be inclined and spread outward. Further, the inclination angle of the flare portion 18b is set to be substantially the same as the angle of the tapered surface of the restricting portion 6.

  Here, as in the first embodiment, the sleeve 18 prevents the sleeve 18 from shifting and dropping, and minimizes the amount of aluminum that melts into the pipe during welding. The inner diameter is set to be substantially equal to the outer diameter of the insertion portion 5 of the inner pipe 3, and the outer diameter is set to a diameter that is extremely smaller than the inner diameter of the heat exchanger piping (hereinafter referred to as piping) 4.

  Also in the second embodiment, the accumulator is assembled by connecting the inner pipe 3 to the pipe 4 via the sleeve 18 and inserting the accumulator body 1 into the accumulator body 1. Hereinafter, the assembly of the accumulator will be described. To do.

  First, a stainless steel sleeve 18 is attached to the insertion portion 5 of the inner pipe 3. At this time, the sleeve 18 is inserted to a position where the end surface thereof abuts on the restriction portion 6 provided on the inner pipe 3. At that time, since the axis of the insertion portion 5 and the sleeve 18 can be aligned using the inclination of the spreading surface of the flare portion 18b provided in the sleeve 18, the mounting operation of the sleeve 18 is facilitated.

  Then, by continuing the insertion of the sleeve 18 into the insertion portion 5, the position of the sleeve 18 is fixed by the contact between the flare portion 18 b and the restriction portion 6.

  Next, the inner pipe 3 fitted with the sleeve 18 is inserted into the inner periphery of the pipe 4. At this time, the pipe 4 is inserted until the tip of the pipe 4 comes into contact with the restriction portion 6 of the inner pipe 3 via the flare portion 18 b of the sleeve 18. At this time, since a force is applied so that the sleeve 8 also comes into contact with the restricting portion 6, no displacement occurs.

  Further, the inner pipe 3 and the pipe 4 connected through the sleeve 18 as described above are inserted so that the inner pipe 3 is positioned in the accumulator body 1. The insertion is performed until the contact portion 7 of the pipe 4 contacts the opening 2 of the accumulator body 1.

  And the welding assembly of an accumulator is completed by welding mainly the contact location in the state which the contact part 7 is contact | abutting to the opening part 2 of the accumulator main body 1. FIG.

  Here, in the above assembly, the sleeve 18 is attached to the insertion portion 5 of the inner pipe 3. However, the sleeve 18 is first attached to the inner periphery of the pipe 4, and in this state, the insertion portion 5 of the inner pipe 3 is attached. Can be inserted into the pipe 4.

  Even in such a case, since the axis of the insertion portion 5 and the sleeve 18 can be aligned using the inclination of the flare portion 18b formed in the sleeve 18, the mounting operation of the sleeve 18 is facilitated.

  In such assembly, the thickness of the aluminum material is ensured by the superposition structure of the accumulator body 1 and the pipe 4 during welding, so that the welding operation can be facilitated, and the reworking or remanufacturing associated with poor welding is possible. Can be reduced. In addition, the use of an aluminum filler rod that is normally used during aluminum welding can be reduced, and a reduction in production cost can be expected.

  In particular, the sleeve 18 has a configuration in which a recess 18 a is formed on the outer periphery thereof and a flare portion 18 b is formed on one end thereof, so that the joint between the tip of the pipe 4 and the inner pipe 3 is welded between the accumulator body 1 and the pipe 4. In addition to being located closer to the inside of the accumulator body 1 than the part, the molten aluminum material is blocked by the recess 18a and the flare part 18b even if it is about to melt into the inner pipe 3 side. The material is more reliably prevented from flowing into the accumulator body 1, and the contact area between the pipe 4 and the sleeve 18 is reduced by the recess 18a. As a result, the transfer of heat to the inner pipe 3 during welding is relaxed, Instability of the fixing structure of the inner pipe 3, the sleeve 18, and the pipe 4 due to thermal strain is also suppressed. , Can be expected smooth flow of the refrigerant, the quality of the accumulator can be further stabilized.

  In addition, since refrigerant leakage due to poor welding can be reduced, the risk of ignition due to refrigerant leakage when using flammable refrigerants such as isobutane and propane can be reduced, increasing reliability. Is something that can be done.

  Furthermore, in the connection between the inner pipe 3 and the pipe 4 and the insertion of the pipe 4 into the accumulator main body 1, the force acting on the sleeve 18 acts in the direction in which the sleeve 18 abuts against the restricting portion 6 in any case. It is possible to suppress the position of the sleeve 18 from being shifted during assembly. That is, the restricting portion 6 provided on the inner pipe 3 restricts the position of the sleeve 18 and the pipe 4 in the insertion direction, and the coupling dimensions of the inner pipe 3, the sleeve 18, and the pipe 4 are the same as in the first embodiment. Can be stabilized. As a result, the fixing structure of the inner pipe 3, the sleeve 18 and the pipe 4 after welding is stabilized, reliability can be improved in securing the dimensions of the shape, etc., and the coolant can flow smoothly. is there.

  Furthermore, the surface of the restricting portion 6 provided in the inner pipe 3 is tapered, so that the processing is facilitated. Further, the tapered surface facilitates the axial alignment of the sleeve 18 and the inner pipe 3, and the piping 4 It is easy to ensure the insertion and fitting with each other, and the displacement of the insertion and fitting during welding can be suppressed.

(Embodiment 3)
FIG. 6 is a perspective view of a stainless steel sleeve according to Embodiment 3 of the present invention. Note that the connection and incorporation of the accumulator main body, inner pipe, and heat exchanger pipe may be the same as those in the first embodiment, and therefore, description will be made mainly with a sleeve.

  The sleeve 28 is formed by pressing a stainless steel tube so that a hemispherical projection 28a is formed on the surface thereof, and processing the whole into a concavo-convex shape. Therefore, a large number of protrusions 28 a are formed on the outer periphery of the sleeve 28.

  The sleeve 28 having the above-described configuration uses the same material as that of the first embodiment, has substantially the same dimensional relationship, and has the same mounting location, and has the structure shown in FIG. Therefore, in the following description, a part of FIG.

  The sleeve 28 is assembled in the same procedure as in the first embodiment, and finally the contact portion between the contact portion 7 of the pipe 4 and the opening portion 2 of the accumulator body 1 is welded.

  The difference from the first embodiment is that a large number of protrusions 28a are formed, so that there is a slight difference between the inner circumference of the heat exchanger pipe (hereinafter referred to as pipe) 4 and the outer circumference of the inner pipe 3. The gap 28b (FIG. 6) is formed.

  As a result, the contact area between the sleeve 28 and the pipe 4 is reduced, and the transfer of heat to the inner pipe 3 during welding is reduced. Therefore, in addition to the effects of the first embodiment, deformation due to heat during welding is suppressed, the fixing structure of the inner pipe 3, the sleeve 28, and the pipe 4 is stabilized, and the reliability of the welding effect is further enhanced. It is something that can be done.

(Embodiment 4)
FIG. 7 is a perspective view of a stainless steel sleeve according to Embodiment 4 of the present invention. The connection and incorporation of the accumulator main body, inner pipe, and heat exchanger pipe may be the same as in the configuration of the second embodiment, and therefore, here, the sleeve will be mainly described.

  The sleeve 38 is formed by pressing a stainless steel tube so that a hemispherical projection 38a is formed on the surface thereof, and processing the whole into a concavo-convex shape. And the flare part 38b bent so that it may incline and spread outward may be formed in the end. The inclination angle of the flare portion 38b is set to be substantially the same as the angle of the tapered surface of the restricting portion formed on the inner pipe.

  The sleeve 38 having the above-described configuration uses the same material as that of the second embodiment, has substantially the same dimensional relationship, has the same mounting location, and has the structure shown in FIG. Therefore, in the following description, a part of FIG.

  The sleeve 38 is assembled in the same procedure as in the second embodiment, and finally the contact portion between the contact portion 7 of the pipe 4 and the opening portion 2 of the accumulator body 1 is welded.

  The difference from the second embodiment is that a minute gap (not shown) formed between the inner circumference of the heat exchanger pipe (hereinafter referred to as pipe) 4 and the outer circumference of the inner pipe 3 is implemented. It is the point formed by many hemispherical protrusions 38a as in the third mode.

  As a result, the contact area between the sleeve 38 and the pipe 4 is reduced, and the transfer of heat to the inner pipe 3 during welding is alleviated. Therefore, in addition to the operational effects of the second embodiment, deformation caused by heat during welding is suppressed, the fixing structure of the inner pipe 3, the sleeve 38, and the pipe 4 is stabilized, and the reliability of the welding effect can be further enhanced. It can be done.

  The aluminum accumulator according to the present invention can sufficiently reduce welding defects and enables a smooth flow of refrigerant in the pipe. Therefore, in addition to refrigeration and refrigeration equipment mainly composed of aluminum and air conditioning equipment, it is used for automobile equipment and water heaters. It can also be applied to the use of equipment.

Sectional drawing of the welding part of the accumulator in Embodiment 1 of this invention The perspective view of the stainless steel sleeve in Embodiment 1 Enlarged view of part A of the sleeve shown in FIG. Sectional drawing of the welding part of the accumulator in Embodiment 2 of this invention The perspective view of the stainless steel sleeve in Embodiment 2 The perspective view of the stainless steel sleeve in Embodiment 3 of this invention The perspective view of the stainless steel sleeve in Embodiment 4 of this invention Sectional drawing which shows the welding structure of the pipe connection part in the conventional aluminum accumulator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Accumulator main body 2 Opening part 3 Inner pipe 4 Heat exchanger piping 5 Insertion part 6 Control part 7 Contact part 8 Sleeve 8a Recessed part (protrusion part)
18 Sleeve 18a Recess (protrusion)
18b Flare part 28 Sleeve 28a Protrusion 38 Sleeve 38a Protrusion 38b Flare part

Claims (5)

  Aluminum accumulator body having pipe connection openings formed at diameters smaller than the center at both ends, an aluminum heat exchanger pipe inserted into one end of the accumulator body, and the heat exchanger pipe A stainless steel sleeve that is inserted into the accumulator body, and an aluminum inner pipe that has one end inserted into the heat exchanger pipe via the sleeve. In the accumulator in which at least a restricting portion for restricting movement of the sleeve is provided, a heat exchanger pipe into which an inner pipe is inserted via the sleeve is inserted into the opening of the accumulator body, and the opening is welded, On the outer peripheral surface, there are provided a plurality of projecting portions provided on the inner peripheral surface of the heat exchanger pipe Yumureta.   The accumulator according to claim 1, wherein a taper portion formed by making a tip of the inner pipe smaller in diameter than a center portion is used as the restriction portion.   The accumulator according to claim 2, wherein a flare portion that contacts the tapered surface of the restriction portion is provided on an end surface of the sleeve on the restriction portion side.   The accumulator according to any one of claims 1 to 3, wherein the protruding portion of the sleeve has a waveform that protrudes in the circumferential direction and the recesses are intermittently continuous in the axial direction.   The accumulator according to any one of claims 1 to 3, wherein the protruding portion of the sleeve is a plurality of hemispherical protrusions protruding from an outer peripheral surface of the sleeve.