JPH0741565Y2 - Pipe with lid for brazing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a brazing pipe used as a header pipe in a parallel flow type condenser manufactured according to brazing specifications.

2. Description of the Related Art A parallel flow type condenser as described above is a tube which is arranged in parallel with a pair of header pipes arranged in parallel and whose both ends are brazed and joined in communication with the header pipes. Is equipped with. In such a condenser, as a header pipe, a brazing sheet in which a brazing material layer is clad on one or both sides of a core material is molded into a pipe shape, and the header pipe and the tube are vacuum brazed or fluxed. It is supposed to be brazed.

Conventionally, as the header pipe as described above, a so-called electric resistance welded pipe has been used in which a brazing sheet is formed into a tubular shape with its both side edges abutted against each other, and the abutting portion is electric resistance welded.

The problem to be solved by the invention However, in the electric resistance welded pipe, the welding process is complicated because the welding for closing the abutting portion is separately required after forming it into a tubular shape, which complicates the manufacturing process and increases the welding cost. However, there was a drawback that the cost was high.

The present invention has been made in order to solve the above drawbacks, and is a brazing pipe used as a header pipe in a parallel flow type condenser, which does not require a welding process after the brazing sheet is formed into a tubular shape. The purpose is to provide a brazing pipe.

Means for Solving the Problems In order to achieve the above object, the present invention provides a brazing of a header pipe and a tube, which is carried out afterwards without separately welding the both side edge butting portions of the brazing sheet. In addition to paying attention to the fact that they can inevitably be joined in the process, in order to prevent thermal deformation in the opening direction of the abutting part due to thermal expansion during heating that occurs when brazing the abutting part without joining, A provisional fixing means for the mating portion is provided. In view of the fact that at least one end of the header pipe of the condenser is often closed by a lid attached separately, the lid piece is used as the temporary fixing means.

That is, the present invention will be described with reference to the reference numerals of the drawings.
A pair of header pipes (3) (4) arranged in parallel
And a tube (1) arranged in parallel and having both ends connected to the header pipe by brazing so as to be in communication with each other, for brazing to be used for the header pipes (3) (4) of a condenser A pipe with a lid, which is made of a molding material of a brazing sheet (30) in which a brazing filler metal layer (30b) is clad on at least one side of a core material (30a), and which is unbonded in a part of the circumferential direction and extending in the longitudinal direction. A single pipe body (3) having a butting part (31) in which a brazing filler metal is present.
a) (4) a lid (7) (8) for preventing opening of the abutting portion, which has a closing portion (72) and a rising edge portion (73) provided on the periphery of the closing portion at least at one end. The present invention provides a brazed pipe with a lid, characterized in that it is attached in an externally fitted state, whereby the above problems can be solved.

Action At least one end of the pipe body (3a) (4a) has a block (7
2) and the rising edge (7
Since the lids (7) and (8) having 3) are attached to the outer fitting state, the outer diameter of the pipe body is regulated by the lid,
Therefore, even if thermal deformation such as thermal expansion occurs in the abutting portion (31) due to heating during brazing, the deformation is prevented and the abutting portion does not open. Further, since the abutting portion (31) is inevitably joined by brazing, there is no need to perform welding for closing the abutting portion before brazing to form an electric resistance welded pipe.

Embodiment Next, an embodiment of the present invention will be described.

3 to 7 show a parallel flow type condenser made of aluminum or its alloy for a car cooler using a brazing pipe according to the present invention.

In these figures, (1) is a plurality of tubes vertically arranged in a horizontal state, and (2) is a corrugated fin interposed between the adjacent tubes (1) and (1). The tube (1) is composed of a flat extruded profile made of aluminum. The tube (1) may be of a so-called harmonica tube, which is a porous type. The corrugated fin (2) has almost the same width as the tube (1) and is joined to the tube by brazing. The corrugated fin (2) is also made of aluminum, and it is preferable to use a louver cut and raised.

(3) and (4) are left and right header pipes having a circular cross section, and the brazing pipes according to the present invention are used as these header pipes. Each header pipe (3) (4) is composed of a pipe body (3a) (4a) and closing lids (7) (8) attached to the upper and lower ends of the pipe body. And each pipe body (3a) (4a)
As shown in FIG. 6, tube insertion holes (13) are formed at intervals along the length direction, and both ends of each tube (1) are inserted into the holes, and by brazing. It is firmly joined and connected. Also the left header pipe body (3a)
While the refrigerant inlet pipe (5) is connected to the peripheral surface of the upper end of the
The outlet pipe (6) is connected to the peripheral surface of the lower end of the right header pipe body (4a). In addition, a partition plate (9) that divides the pipe body into upper and lower chambers is provided at approximately the center of the left header pipe body (3a), while it is located below the center of the right header pipe body (4a). The partition plate (10) is provided so that the refrigerant that has flowed into the left header pipe body (3a) from the refrigerant inlet pipe (5) flows in a meandering manner around all the refrigerant passages constituted by the tube group, and the refrigerant flows. Heat is exchanged with the air flowing out from the outlet pipe (6) and flowing through the air circulation gap including the corrugated fins (2) formed between the tubes (1) and (1) in the direction indicated by the arrow (W). It is supposed to be done and condensed. Note that (11) and (12) shown in FIG. 3 are upper and lower side plates arranged outside the outermost corrugated fins.

The header pipes (3) and (4) are constructed as follows. That is, as shown in FIGS. 1 and 2, these header pipes have a double-sided brazing sheet (3) in which a brazing material layer (30b) is coated on both surfaces of a core material (30a).
0) is formed into a single pipe main body (3a) (4a) by making both side edges thereof in a state of being abutted against each other, and lids (7) (8) are attached to the upper and lower ends of each pipe main body. It was done. Here, the lids (7) and (8) are formed in a bottomed cylindrical cap shape having a fitting portion (71) having an inner diameter that is substantially the same as or slightly larger than the outer diameter of the pipe bodies (3a) and (4a). And the pipe body (3a) (4a) in this fitting part (71)
The end portions of are brazed and integrated in a fitted state. This lid (7) (8) is the pipe body (3a)
Along with the role of closing the open end of (3b), it also plays a role of preventing the opening of the abutting part (31) of the pipe body due to thermal deformation during brazing heat by controlling the outer diameter of the pipe body. Is. In addition, the closures (7) and (8) are formed so that the closing portion (72) is slightly thicker from the viewpoint of ensuring strength, and the fitting portion (71) provided on the periphery of the closing portion (72) is provided. An outer surface of the rising edge portion (73) to be formed is cut into a taper shape and is gradually thinned toward the tip. By forming the rising edges of the lids (7) and (8) in this manner, the rising edges and the pipe body (3a)
There is no step between the outer surface of (4a) and the outer surface, which improves the appearance.

The method for manufacturing the header pipes (3) and (4) will be described. First, as shown in FIGS. 8 and 9, a predetermined brazing material layer (30b) is formed on both surfaces of a core material (30a) made of aluminum. Prepare a brazing sheet (30) of the size. As the brazing material layer (30b), an Al-Si alloy having a Si content of about 6 to 13 wt% is generally used.

Then, as shown in FIG. 10, the brazing sheet (3
A plurality of notches (34) are formed at the same position on both side edges of (0). After the abutting of both side edges, the notches correspond to each other, but the notches are matched to each other, and the partition plate (9)
A partition plate insertion hole (14) for installing the (10) will be formed.

Next, both widthwise end portions (35a) (35b) of the brazing sheet (30) are hammered in a thickness direction with a hammer or a press. This striking is performed on the lower surface for one side end portion (35a) and on the upper surface for the other side end portion (35b), so that one side end portion is pressed from the lower edge as shown in FIG. An inclined surface (35a ') that gradually becomes thinner toward the upper edge is formed, and an inclined surface (35a') that gradually becomes thinner from the upper edge to the lower edge is formed at the other side end.
b ') is formed. Moreover, the brazing material layer (30b) is present on any of the inclined surfaces. By forming the both ends of the brazing sheet (30) in this way, the seventh
As shown in the figure, when the both edges are abutted against each other to form a cylinder, the abutting part (31) can be overlapped and the brazing material layer (30b) can be interposed on the abutting surface. The subsequent brazing can ensure sufficient joining of the abutting part (31).

Next, as shown in FIG. 12, the brazing sheet (30)
The center portion in the width direction of the bulge is bulged to have a semi-circular cross section along the length direction by pressing to form a bulge portion (36).

Next, as shown in FIG. 13, tube insertion holes (13) are formed in the bulging portion (36) along the circumferential direction at intervals in the length direction of the bulging portion. This perforation is performed by pressing with a pressing die having a shape matching the shape of the bulging portion (36) from the lower surface side. By doing this, the bulge (36)
It is possible to prevent crushing and deformation of the tube and to form the tube insertion hole (13) with high dimensional accuracy at an appropriate position.

Next, in order to facilitate insertion of the tube (1) into the tube insertion hole (13), preferably, as shown in FIG. 14, the tube insertion is performed on the bulging side surface of the bulging portion (36). Chamfer the edge of the hole (13). In the figure,
(37) is a chamfer.

Then, after chamfering as necessary, the horizontal parts (38) on both sides of the brazing sheet (30) excluding the bulging part (36) are
After bending by a press to form a U-shaped cross section as shown in Fig. 15, the header is deformed into a single round pipe shape while applying external force so that both edges are in abutting shape. Obtain the pipe bodies (3a) (4a). After that, the header pipe bodies (3a) (4a) are washed if necessary, and then sent to the heat exchanger assembling step, and the lids (7) and (8) separately manufactured are attached to both ends in the middle of the step. , The intended header pipes (3) and (4).

The condenser is manufactured by inserting the ends of the tubes (1) into the tube insertion holes (13) of the header pipes (3) and (4), and inserting the partition plate (9) into the partition plate insertion hole (14). (1
0) is inserted, and then the side plates (11) (12) and the like are arranged at predetermined positions and collectively brazed by furnace brazing or the like. After such brazing, as shown in FIG. 7, the header pipe body (3a)
A sufficient fillet (15) is formed at the connecting portion between the (4a) and the tube (1), and the header pipes (3) and (4) and the tube (1) are firmly joined and integrated without a gap. . In addition, fillets are also formed on the abutting portions (31) of the pipe bodies (3a) (4a), and the abutting portions (31) are joined in a sealed state.

In the above examples, the brazing sheet has the brazing material layers clad on both sides, but the brazing material layer may be clad on only one side. Also,
The rising edge of the lid does not necessarily have to exist over the entire circumference, and may exist in a partially protruding state. Moreover, the cross-sectional shape of the pipe is not limited to a circular shape, and may be a quadrangular cross-section or any other shape.

Effect of the Invention According to the above, the present invention is composed of a molded body of a brazing sheet, and at least one end of a pipe body having an unjoined but brazing material intervening abutting portion extending in the longitudinal direction in a part of the circumferential direction. Since the lid for preventing the opening of the abutting portion is attached to the outer fitting state, the outer diameter of the pipe body is regulated. Therefore, this brazing pipe is used as a header pipe. When the tube is brazed with the tube, the lid body can prevent the abutting part of the header pipe from opening easily due to thermal deformation when the brazing heat is applied because the pipe body is single, and the shape after molding is retained. Good brazing can be performed as it is. Of course, after brazing, the abutting part is completely joined by the brazing material, so there is no need to perform welding for closing the abutting part before brazing as in the conventional electric resistance welded pipe, and the header is eliminated. Brazing of the abutting portion can be performed together with the brazing joining process of the pipe and the tube.
Therefore, the welding process can be eliminated, and the manufacturing process of the brazing pipe and the condenser can be simplified and the manufacturing cost can be reduced. In addition, when the condenser is in use after brazing, a high internal pressure is applied to the header pipe, which causes a force in the peeling direction to be applied to the abutting portion, but the lid acts to prevent this, so after brazing It is also possible to improve the strength of the pipe, and eventually it is possible to provide a condenser having excellent durability.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an embodiment of the present invention, FIG. 2 is a front view showing a part of the device, and FIG. 3 is a brazed pipe with a lid shown in FIG. 1 and FIG. A front view of the condenser used as a header pipe, FIG. 4 is a plan view of the same, FIG. 5 is a sectional view taken along the line VV of FIG. 3, and FIG. 6 shows the header pipe and the tube and corrugated fins separately. 7 is a perspective view, FIG. 7 is a sectional view taken along line VII-VII of FIG. 3, and FIG.
FIG. 15 is a view for explaining the manufacturing process of the header pipe shown in FIG. 1, FIG. 8 is a sectional perspective view of a brazing sheet as a material, and FIG. 9 is a sectional view taken along line IX-IX of FIG. Fig. 10, Fig. 10 is a sectional perspective view after forming a notch, Fig. 11 is a sectional view after striking both side ends of a brazing sheet, and Fig. 12
Figure is a sectional perspective view after forming the bulge, Figure 13 is a sectional perspective view after drilling the tube insertion hole, Figure 14 is a side view after chamfering the tube insertion hole, and Figure 15 is a U-shaped section. It is a cross-sectional perspective view after molding. (3) (4) …… Header pipe (pipe with brazing lid), (3a) (4a) …… Pipe body, (7) (8) ……
Lid, (30) …… Brazing sheet, (30a) …… Core material, (30b) …… Brazil layer, (31) …… Abutting part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Noboru Kotachi No. 6 224 Kaiyama-cho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd. (56) References -42665 (JP, B2) Actual public Sho 62-26706 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A pair of header pipes (3) (4) arranged in parallel, and a tube (1) arranged in parallel and having both ends brazed to the header pipe in a communicating state. A brazing pipe used for the header pipes (3) (4) of a condenser having a brazing sheet (30), wherein a brazing material layer (30b) is clad on at least one side of a core material (30a). ), And at least one end of a single pipe body (3a) (4a) having an unjoined but brazing material abutting portion (31) extending in the lengthwise direction in a part of the circumferential direction, Block (7
2) and the rising edge (7
A brazed pipe with a lid, characterized in that the lids (7), (8) having the above (3) for preventing the opening of the abutting portion are attached in an externally fitted state.