JP3220866B2 - Heat exchanger piping connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a heat exchanger pipe used for connecting a pipe for flowing a refrigerant from an evaporator to an accumulator in a refrigerating cycle of a refrigerator, for example.

[0002]

2. Description of the Related Art Conventionally, in a refrigerating cycle of a refrigerator, a system for reducing pressure using a capillary tube is used, so that a flow rate of a refrigerant is constant irrespective of a change in load. Therefore, an accumulator is arranged on the evaporator side,
The refrigerant liquid is stored so that the refrigerant liquid does not directly go to the compressor due to load fluctuation, gasified, and then sent to the compressor.

[0003] In addition, when quietness is taken into consideration, as in a home refrigerator or the like, an inner pipe is provided inside the accumulator, and the refrigerant liquid from the evaporator is contained in the refrigerant liquid stored in the accumulator. Are not allowed to pass directly.

[0004]

On the other hand, from the viewpoint of weight reduction, while all-aluminum evaporators have become widespread,
Particularly, the pipe connected to the accumulator is attached by TIG welding. For example, as shown in Japanese Utility Model Publication No. Sho 63-2190, the end of the pipe of the evaporator is simply butted against the tip of the inner pipe of the accumulator. In such a case, there is a problem that a gap is formed, so that automatic welding is difficult and welding is not stable. Because, during welding, the initial current is concentrated at the end of the pipe, and the edge of the pipe melts,
This is because leakage occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a heat exchanger pipe connecting apparatus which can perform automatic welding and stabilize the quality after welding. To be.

[0006]

To achieve the above Symbol object of SUMMARY OF THE INVENTION The invention of claim 1, wherein the invention, the aluminum heat exchanger tubing, from such housing portion and this open end the refrigerant a device connected to the instrument of aluminum accumulator or the like having a inserted inner pipe, Lee
The connection side end of the inner pipe is expanded and
A convex edge is formed, and an annular step is formed near the tip.
There are formed, the inner pipe is inserted from this open end to the coolant or the like within the housing of the instrument, if it takes outer convex edge of the inner pipe tip to the open end of the coolant or the like containing portion
Align is, end that is expanded pipe of the inner pipe is a refrigerant or the like
Is allowed positioned open end of the housing portion, the end portion of the inner pipe, is plugged stainless <br/> scan steel backing sleeve having an outer convex portion to the middle of the length, the outer of the sleeve
The convex part is engaged with the annular step of the inner pipe.
And the front half of the sleeve before the outer convex part is annular.
It is inserted deeper than the step, and is inserted into the end of this inner pipe.
Make sure the end of the pipe fits over the rear half of the sleeve
And the tip of the pipe is the outer convex part of the sleeve.
And the sleeve is
It is present so as to straddle the end of the pipe, and the opening end of the refrigerant storage portion, the end of the inner pipe and the end of the pipe are integrally joined by welding in a state of being overlapped three times. It is characterized by being.

[0007] The invention according to claim 2 of the present invention provides:
Replace the aluminum heat exchanger piping with the refrigerant
And an inner pipe inserted from the opening end of the
Equipment to connect to aluminum accumulators and other instruments
Wherein the inner pipe is inserted into the refrigerant etc. accommodating portion.
And the end on the connection side of this
Located on the side, at the end of the pipe,
Three round stainless steel backing with convex
The sleeve is retracted and inserted.
Due to the ring back, an annular outward convex part near the tip of the pipe
The outer convex part of the sleeve is fitted into the annular groove 7 inside the part.
To position the sleeve,
Is fixed to the inner surface of the pipe end, and the inner
At the end of the pipe, the end of the pipe containing the backing sleeve
However, the tip of the inner pipe hit this annular outer convex part.
The backing sleeve.
Be present so as to straddle the pipe end and the inner pipe end.
And the inner end of the opening
The end of the pipe and the end of the pipe are overlapped three times
Characterized by being integrally joined by welding
ing.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1 First, in FIG. 3, for example, an aluminum evaporator (1) used in a refrigeration cycle of a home refrigerator includes a large number of plate fins (2) in a straight portion of a meandering refrigerant flow pipe (3). Are mounted orthogonally, and a pair of side plates (5) (5) are arranged on both left and right outer sides of the plate fin (2).
An accumulator (10) made of aluminum is arranged on the left side of the evaporator (1). The accumulator (1) is arranged so that the refrigerant liquid does not directly go to a compressor (not shown) due to a load change.
Refrigerant liquid is stored inside 0), and the gasified refrigerant is sent to the compressor. Inside the accumulator (10), considering the quietness of the refrigerator,
An inner pipe (12) made of aluminum is inserted, and the refrigerant liquid stored in the accumulator (10) flows through the evaporator.
The refrigerant liquid from (1) is prevented from passing directly. Meandering defrosting heating tubes (6) are attached to the front and rear side edges of the parallel plate fins (2).

As shown in detail in FIGS. 1 and 2, an evaporator
Pipe (4) extending the end of meandering refrigerant flow pipe (3) in (1)
However, an accumulator is provided by the pipe connection device according to the present invention.
It is connected to the refrigerant accommodating section (11) of (10) and the inner pipe (12).

That is, first, in the assembled state before welding, as shown in FIG.
(12a) is expanded to form an outwardly projecting edge (14) at the tip and an annular step (13) near the tip. Then, the inner pipe (12) is inserted into the coolant accommodating portion (11) of the accumulator (10) from its open end (11a), and the outer convex edge (14) at the tip of the inner pipe (12) is cooled. The expanded end (12a) of the inner pipe (12), which is engaged with the open end of the storage section (11), is connected to the refrigerant storage section (11).
It is located within the open end (11a ) of the slab. This Inn
Insert the inner pipe (12) when inserting the inner pipe (12).
The outer convex edge (14) of the tip is hooked on the open end of the refrigerant storage part (11).
Insert the inner pipe until it is aligned
(12) Insertion is easy. And this inner pipe
At the end (12a) of (12), a stainless steel backing sleeve (15) having an annular outward convex part (16) in the middle of the length is inserted, and the outer convex part of the sleeve (15) is inserted. (16) is the inner pipe (1
2), and the front half (15a) of the sleeve before the outer convex portion (16) is engaged with the annular step (1).
3) It is inserted deeper. Also, inside the end (12a) of the inner pipe (12), the piping of the evaporator (1)
(4) the end of (4a), Ru is inserted to be fitted around the second half portion (15b) of the sleeve (15). At the end (4
For the insertion of a), insert the end (1) of the inner pipe (12).
The outer ridge (14) formed by expanding the tube in 2a) serves as a guide.
It is easy to insert the pipe end (4a)
The tip of (4) is abutted against the outer convex portion (16) of the sleeve (15), and the sleeve (15) is connected to the end (4a) of the pipe (4) and the end (12a) of the inner pipe (12). ).

In this state, the opening end (11a) of the refrigerant accommodating portion (11) of the accumulator (10) and the inner pipe (1)
The end (12a) of (2) and the end (4a) of the pipe (4) are integrally joined by TIG welding.

After welding, as shown in FIG. 2, an outer convex edge (14) at the tip of the inner pipe (12) formed by expanding the pipe.
Has melted away to form one annular weld bead (20).

As described above, according to the present invention, the opening end (11a) of the refrigerant accommodating portion (11), the inner pipe end (12a), and the piping end (4a) is welded to the superposed planar portion, so there is no burn-through.

Further, the initial current value can be set high by the triple wrap structure of the open end (11a), the inner pipe end (12a), and the pipe end (4a) of the refrigerant accommodating portion (11). Therefore, the quality after welding can be stabilized.

Embodiment 2 FIG. 4 shows a second embodiment of the present invention. Here, the point different from the case of the first embodiment is that an annular outer convex portion (17) is provided by a so-called beading process at a portion near the front end of the aluminum pipe (4). The outer convex portion (16) of the stainless steel backing sleeve (15) is fitted into the annular concave groove (17a) inside (17), and the sleeve (15) is positioned. is there.

The end (12a) of the inner pipe (12) is not expanded, but is straight.
2) is inserted into the coolant accommodating portion (11) of the accumulator (10), and its end (12a) has an open end (11) of the coolant accommodating portion (11).
a) It is located inside. At the end (12a) of the inner pipe (12), the end (4a) of the pipe (4) containing the stainless steel backing sleeve (15) is fitted to the annular outer convex portion (17). ) Is inserted until the tip of the inner pipe (12) hits, so that the backing sleeve (15) is present so as to straddle the pipe end (4a) and the inner pipe end (12a). I have.

The opening ends of these refrigerant accommodating portions (11)
(11a), the end (12a) of the inner pipe (12) and the piping
The end (4a) of (4) is integrally joined by welding.

In the second embodiment, as shown in FIG. 5, a stainless steel backing sleeve (15) having an outwardly convex portion (16) in the middle of the length is a circular one having a circular shape. It was used.

As shown in FIG. 2A, the backing sleeve 15 has a relatively large opening in a normal state.
(18) is opened, and when inserted into the end (4a) of the pipe (4), the sleeve (15) is contracted and inserted as shown in FIG. And the end of the pipe (4)
After being inserted into (4a), the sleeve (15) is firmly fixed to the inner surface of the pipe end (4a) by the so-called spring back of the sleeve (15) itself.

The backing sleeve (15) has, for example, a partially circular shape as shown in FIG. 6, but has no opening (18) in a normal state (see FIG. 6). (See Fig. A), and both side edges of the opening of the sleeve (15)
(19) (19) is cut diagonally and the end (4a) of the pipe (4)
When the sleeve (15) is retracted during insertion into the opening (1
The side edges (19) and (19) of (8) may be formed so as to overlap each other (see (b) in the figure). In this case as well, after insertion into the end (4a) of the pipe (4), the sleeve
(15) The point that the sleeve (15) is firmly fixed to the inner surface of the pipe end (4a) by the springback of itself is the same.

According to the examples shown in FIGS. 5 and 6, the pipe (4)
An annular outward convex portion (17) is provided near the tip of the
Stainless steel is inserted into the annular groove (17a) inside the outer convex part (17).
The outer convex portion (16) of the steel-made circular backing sleeve (15)
The sleeve (15) is
Therefore, it is easy to insert the sleeve (15) into the end (4a) of the pipe (4) .
Due to the spring back of the sleeve (15) itself,
(4a) Since it is firmly fixed to the inner surface, the backing sleeve
(15) the insertion work is very simple, Ru can be performed welding operation very easily and reliably. Ma
At the end (12a) of the inner pipe (12), stainless steel
End (4a) of pipe (4) containing sleeve (15) made of backing
However, the end of the inner pipe (12) is
Positioning is easy because it only needs to be inserted until the end hits
The work of inserting the pipe (4) is very simple. In the above embodiment, according to the present invention, the pipe (4) extending the end of the meandering refrigerant flow pipe (3) of the evaporator (1) is connected to the refrigerant accommodating section (11) of the accumulator (10) and the inner pipe. (12), but if the evaporator (1) is made by other roll bonding method, the outer end of the pipe attached to the end of the refrigerant passage The part is similarly connected to the refrigerant storage part (11) of the accumulator (10) and the inner pipe (12).

In the embodiment, a backing sleeve is used.
(15) outward protrusion (16) is being made annular, which may or may not be partially protruded not good. Further, the present invention is not limited to the case where the pipe (4) from the evaporator (1) is connected to the refrigerant accommodating portion (11) of the accumulator (10) and the inner pipe (12), but also from other heat exchangers. The present invention can be similarly applied to a case where the piping of (1) is connected to an aluminum appliance provided with a storage section for a refrigerant or the like such as a liquid receiver (receiver / dryer) and an inner pipe.

[0024]

According to the first aspect of the present invention , as described above, the aluminum heat exchanger pipe is provided with the refrigerant etc. accommodating section and the inner pipe inserted from the open end of the section. This is a device for connecting to an aluminum accumulator or other device. The connection end of the inner pipe is expanded.
It is piped to form an outer convex edge at the tip, and
An annular step is formed near the end, and this inner
Paipu but this open end portion in the refrigerant or the like containing portion of the instrument
The outer convex edge of the inner pipe tip is
Hooked to the open end of the container,
End that is expanded pipe is made to position the open end of the refrigerant such housing portion, the end portion of the inner pipe, the outer intermediate the length
Insert the stainless steel backing sleeve having a Hototsu portion
And the outer convex portion of the sleeve is formed into an annular shape of the inner pipe.
It is hooked on the step and in front of the outward projection
The first half of the sleeve is inserted deeper than the annular step,
The end of the pipe is at the end of the inner pipe,
Part so that it can be fitted over
The end is abutted on the outward convex part of the sleeve, and the sleeve is
Straddle the end of the pipe and the end of the inner pipe.
The opening end of the storage section for refrigerants, the end of the inner pipe, and the end of the pipe were overlapped three times.
Those which are integrally joined by welding in a state, the inner
-When inserting the pipe into the storage part such as the refrigerant of the appliance,
The outer convex edge at the tip of the inner pipe is the open end of the storage section for refrigerant etc.
Insert it until it is engaged with the
-Easy insertion of pipes. And the inner pipe
The end of the pipe fits into the rear half of the sleeve
The pipe is inserted so that it
At the time of insertion, expand the pipe at the end of the inner pipe.
The outer convex edge formed as a guide serves as a guide for inserting the pipe end.
Easy to include. According to the first aspect of the present invention,
In this case, the flat part is welded instead of the butt part of the pipe as in the past, so there is no burn-through, the deterioration of the quality due to the melting of the pipe end face can be avoided, and automatic welding is possible It is.

Further, since the initial current value can be set high by the triple wrap structure of the opening end of the refrigerant etc. accommodating portion, the inner pipe end and the pipe end, the quality after welding is stabilized. Is achieved.

The invention according to claim 2 of the present invention provides:
As described above, the heat exchanger piping made of aluminum
Medium and other inner part inserted from the opening end
Instrument aluminum accumulator or the like and a type
The inner pipe contains refrigerant etc.
The end of the connection side of the
Is located inside the open end of the
Of stainless steel with an outer convex part in the middle of
The backing sleeve is inserted with the sleeve shortened.
Due to the spring back of the probe itself,
Outer convex part of the sleeve in the annular concave groove inside the circular outer convex part
Is inserted and the sleeve is positioned.
The sleeve is fixed to the inner surface of the pipe end.
At the end of the inner pipe, a sleeve for backing was placed
The end of the pipe is connected to the outer
By inserting the tip until it hits,
Leaves straddle the pipe end and inner pipe end
, The opening end of these refrigerant etc. storage portion,
The end of the inner pipe and the end of the pipe overlap three times
In a stretched state, they are joined together by welding
An annular outward convex portion is provided near the tip of the pipe,
At the end of the tube, the back of a missing circle with an outward convex part in the middle of the length
Since the contact sleeve is inserted after being contracted,
The circular groove on the inside of the outer convex part
The outer convex part of the sleeve is fitted to position the sleeve.
And insert the sleeve into the end of the pipe
Work is easy, and after insertion, for the backing
Due to the spring back of the sleeve itself,
Since it is firmly fixed to the surface, the insertion work of the backing sleeve
Work is very simple and the welding work is extremely
It can be performed easily and reliably. In addition, In'napa
Stainless steel backing sleeve at end of ip
The end of the pipe that has been
It is only necessary to insert until the tip of
Simply, the work of inserting the pipe is very simple. Of the present invention
According to the second aspect of the present invention, the conventional butting of pipes is performed.
Not the open end of the coolant etc.
The part where the end of the pipe and the end of the pipe are overlapped three times
There is no burn through due to welding. In addition, storing refrigerant etc.
Of the open end of the part, the end of the inner pipe and the end of the pipe
The initial current value can be set higher by the wrap structure of
To stabilize the quality after welding
To play.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a main part of a connection portion between a heat exchanger pipe and an accumulator according to a first embodiment of the present invention, showing a combined state before welding.

FIG. 2 is an enlarged side view of a main part of a connection portion between the pipe and the accumulator, showing a state after welding.

FIG. 3 is a schematic front view of an evaporator provided with an accumulator.

FIG. 4 is an enlarged side view of a main part of a connecting portion between a heat exchanger pipe and an accumulator according to a second embodiment of the present invention.

5 is an enlarged end view showing one example of a stainless steel backing sleeve. FIG. 5A shows a normal state of the sleeve.
FIG. 5B shows a state in which the sleeve is contracted.

FIG. 6 is an enlarged end view showing another example of a stainless steel backing sleeve. FIG. 6A shows a normal state of the sleeve, and FIG. 6B shows a state in which the sleeve is contracted.

[Explanation of symbols]

Reference Signs List 1 evaporator 3 meandering refrigerant flow pipe 4 aluminum heat exchanger pipe 4a end 10 accumulator (apparatus) 11 accumulator refrigerant storage section (refrigerant storage section) 11a open end 12 inner pipe 12a end 13 annular Step 14 Outer convex edge 15 Stainless steel backing sleeve 15a Sleeve front half 15b Sleeve rear half 16 Outer convex portion 17 Annular outer convex portion 17a Annular concave groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-33589 (JP, A) JP-A-53-19159 (JP, U) JP-A-63-2190 (JP, Y2) JP-A-1- 14367 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 41/00 F16L 13/02 F25B 43/00

Claims (2)

(57) [Claims] 1. A heat exchanger pipe made of aluminum (4)
And a device connected to the refrigerant or the like accommodating portion (11) of aluminum accumulator like instrument with a inserted inner pipe from which the open end (11a) (12) (10), b
The connection end (12a) of the inner pipe (12) is expanded,
An outward convex edge (14) is formed at the tip, and
An annular step (13) is formed in
Type (12) is inserted from this open end to the coolant or the like accommodating portion (11) of the instrument (10) (11a), the inner pipe (12) the tip of the
The outwardly protruding edge (14) engages with the opening end of the refrigerant storage section (11).
The expanded end (12a) of the inner pipe (12 )
There is allowed positioned at the opening end portion (11a), such as housing section refrigerant (11), the end of the inner pipe (12) (12a), in the length
A stainless steel backing sleeve (15) having an outer convex portion (16) between them is inserted, and the outer convex portion (16) of the sleeve (15) is inserted.
Is hooked on the annular step (13) of the inner pipe (12).
And the first half of the sleeve before the outer convex part (16)
(15a) is inserted deeper than the annular step (13).
-The end (4a) of the pipe (4) is connected to the end (12a) of the pipe (12).
Insert so that it can be fitted over the rear half (15b) of the leave (15).
And the end of the pipe (4) is outwardly convex on the sleeve (15).
Section (16) and the sleeve (15) is at the end of the pipe (4).
Part (4a) and the end (12a) of the inner pipe (12).
They are allowed to be present urchin, pipe open end portion of the refrigerant such as housing portion (11) and (11a) end of the inner pipe (12) and (12a) (4)
The heat exchanger pipe connection device is integrally connected by welding in a state where the end (4a) is overlapped three times. 2. A heat exchanger pipe made of aluminum (4).
Is inserted from the refrigerant storage section (11) and the open end (11a) thereof.
Aluminum pipe with a closed inner pipe (12)
A device for connecting to a device (10) such as a accumulator,
The inner pipe (12) is inserted into the coolant storage section (11),
The end (12a) on the connection side of this is the open end of the refrigerant storage section (11).
Section (11a) and the end (4a) of the pipe (4)
Made of stainless steel with an outer convex part (16) in the middle of the length
The missing circular backing sleeve (15) is
After insertion, the sleeve (15) itself is
And the inside of the annular outer convex part (17) near the tip of the pipe (4).
The outer convex part (16) of the sleeve (15) fits into the annular groove (17a).
And the sleeve (15) is positioned.
The sleeve (15) is fixed to the inner surface of the pipe end (4a).
To the end (12a) of the inner pipe (12)
The end (4a) of the pipe (4) containing the sleeve (15) is
Until the tip of the inner pipe (12) hits the outer convex part (17).
The backing sleeve (15).
Straddle the pipe end (4a) and the inner pipe end (12a)
And the open ends of these refrigerant storage sections (11).
(11a), the end (12a) of the inner pipe (12) and the piping
With the end (4a) of (4) overlapped three times, welding
Connection unit for heat exchanger piping
Place.