JPH01291098A - Mounting device for outlet pipe and inlet pipe in heat exchanger - Google Patents

Abstract

PURPOSE:To miniaturize a heat exchanger and reduce the weight as well as the cost of the material of the same, by a method wherein an outer peripheral surface around a heat exchanging medium flowing port, bored on the peripheral wall of either one of an inlet pipe or an outlet pipe for a header, is abutted against the arced peripheral rim of a cut-in hole formed on the peripheral wall of the other one to weld both of them. CONSTITUTION:Cut-in holes 11, permitting the engagement of one part of the outer peripheral surfaces thereof with headers 3, 4 under a condition that they are intersected orthogonally, are bored and formed on the peripheral walls of an outlet pipe 6 and an inlet pipe 7 at the lengthside middle part thereof. The peripheral rim 11a of the cut-in hole 11 is formed so as to have an arced shape conforming to the outer peripheral surfaces of the headers 3, 4 and contact with the outer peripheral surfaces of the headers 3, 4 closely in a condition that the headers 3, 4 are fitted into the cut-in holes 11. On the other hand, circular heat exchanging medium flowing holes 12 are formed on the outside surfaces of the peripheral walls of the headers 3, 4 and the mounting positions of the inlet pipe 6 and the mounting positions of the outlet pipe 7. The cut-in holes 11 of the outlet pipe 6 and the inlet pipe 7 are abutted against the outer peripheral surfaces of the headers 3, 4 around the flowing holes 12 to attach them to the headers 3, 4 by brazing or welding under a condition that they are intersected with each other orthogonally.

Description

[Detailed Description of the Invention] Industrial Application Field This invention is a heat exchanger used in a condenser, oil cooler, radiator, etc. for a car air conditioner, and in particular is equipped with a header made of a circular tube, and the header is equipped with a header made of a circular tube. The present invention relates to a mounting device for an inlet/outlet pipe of an exchange medium in a heat exchanger that connects the inlet/outlet pipe.

Conventional technology Even in fields where serpentine heat exchangers have traditionally been used, particularly in condensers for car air conditioners, there are alternatives to serpentine heat exchangers that offer ease of manufacture, design freedom, and heat exchangers. For good exchange efficiency, a multi-pass type heat exchanger, as seen in Japanese Unexamined Patent Publication No. 63-34466, is equipped with a pair of headers on the top and bottom or on the left and right, and a pair of headers is installed at both ends between these headers. A heat exchanger has been proposed in which a large number of flat tubes are connected in communication and arranged in parallel, and corrugated fins are arranged between adjacent flat tubes, and its advantages are attracting attention. According to such a heat exchanger, since the tube pitch can be freely selected, the cross-sectional area of the refrigerant passage can be arbitrarily increased, and the number of fins interposed between the tubes can also be increased. Excellent exchange efficiency can be achieved.

By the way, in the above-mentioned type of heat exchanger, the header is generally composed of a circular tube, and an inlet pipe and an outlet pipe that control the inflow and outflow of a heat exchange medium such as a refrigerant are connected to the header. Generally, a joining structure as shown in FIG. 8 or 9 has been adopted. That is, as shown in FIG. 8, the end surface of the inlet/outlet pipe (2I) is brought into contact with the end of the header (20), or fitted, and the two are joined by brazing or welding, or as shown in FIG. Heat exchange medium distribution holes (25 mm) are installed on the peripheral wall of the header (25 mm
), the end surface of the inlet/outlet pipe (21) is processed into a concave arc shape that fits the outer peripheral surface around the flow hole, and the two are joined by brazing, welding, etc. It had been.

Problems to be Solved by the Invention However, in this type of heat exchanger, the union (22) of the inlet/outlet pipe (21) is connected to the header (2) due to the installation space or the piping design of the heat exchange medium. 2
There are cases where it is required to place the device directly in front of the device 0) and facing forward, and the conventional joining structure and mounting structure lack adaptability to such a request. That is, in the structure shown in FIG. 8, it is difficult to position the union (22) on the front side of the header (20), while in the structure shown in FIG. Since it is difficult to drill a flow hole on the front side due to interference with the joint hole (24) of the tube (23), unnecessary pipe routing is required by curving the inlet/outlet pipe (21). However, there were problems in that it required extra installation space, material costs, and processing costs.

In view of the above-mentioned problems, the present invention aims to provide a simple mounting device that allows connection of inlet and outlet pipes by locating a union in close proximity to the front or side of the header. purpose.

Means for Solving the Problems This invention proposes, for the above-mentioned purpose, to connect the header and the heat exchange medium outlet pipe or inlet pipe in a compact manner by adapting their peripheral walls. .

That is, in the present invention, a large number of flat tubes are arranged in parallel between a pair of headers made of circular tubes, corrugated fins are arranged between adjacent tubes, and a heat exchange medium inlet pipe is provided in the header. In the heat exchanger to which the outlet pipe is connected, a heat exchange medium circulation hole is formed in the peripheral wall of the header and either the inlet pipe or the outlet pipe, and the peripheral edge is formed in the other peripheral wall. An arcuate cut hole is formed to fit the outer peripheral surface of the heat exchanger medium, and the arcuate periphery of the cut hole is brought into contact with the outer peripheral surface around the heat exchange medium circulation hole to join the two. The gist is the installation device for inlet and outlet pipes in exchangers.

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

The heat exchanger shown in the illustrated embodiment is made of aluminum alloy and is used as a condenser for a car cooler.
In the figures, (1) is a large number of flat tubes arranged in parallel in a horizontal state, (2) is a corrugated fin interposed between adjacent tubes, (3) and (4).
is a pair of left and right headers. The tube (1) is generally a flat hollow extruded material made of aluminum, but a porous flat extruded tube called a harmonica tube or an electric resistance welded tube may also be used. Fin (2)
) has approximately the same width as the tube (1), and is integrally joined to the tube (1) by brazing.

The headers (3) and (4) each consist of a circular cross-sectional tube made of an ERW tube or an extruded tube made of an aluminum plating sheet with a brazing material layer on one or both sides, and the tube is attached to one side of the peripheral wall. (1) is hermetically joined by brazing with the end inserted, and both ends of each header (3) and (4) are fitted with cover plates (5) or spun. etc. are blocked.

In addition, a short straight heat exchange medium inlet pipe (6) and a short straight heat exchange medium outlet pipe (7) are attached to mutually opposite ends of each header (3) and (4), and each There are partition plates (8) and (9) inside the headers (3) and (4), respectively.
The refrigerant flowing into the inlet header (3) from the inlet pipe (6) flows in a meandering manner around the entire refrigerant passage constituted by the tube group, and is attached to the outlet header (4). While flowing out of the vessel from the outlet pipe (7), the air exchanges heat with the air flowing through the ventilation gap between the tubes (1) and is condensed.

By the way, the header of the inlet pipe (6) and outlet pipe (7) (
3) The details of the mounting structure for (4) are shown in FIGS. 1 and 4. The inlet/outlet pipes (3) (4) are all equipped with a union (lO) at the tip, while the proximal end is closed, and a header (3) (4) is attached to the peripheral wall of the intermediate part in the length direction. ) is formed with a cut hole (11) that allows a portion of the outer circumferential surface thereof to be fitted in an orthogonal manner. That is, the cut hole (11) has a peripheral edge (
lla ) has an arc shape that fits the outer peripheral surface of the header (3) (4), and when the header (3) (4) is fitted, the arcuate peripheral edge (Ha ) fits the header (3) (4). ) is placed in close contact with the outer peripheral surface of the On the other hand, on the header (3) (4) side, there is an entrance W (6) (
At the mounting position 7), a circular heat exchange medium circulation hole (12) is bored on the outer side surface of the peripheral wall. The inlet/outlet pipes (6) and (7) have the cut holes (11) in contact with the outer peripheral surfaces of the headers (3) and (4) around the flow holes (12), and the peripheral edges (lla) The headers (3) and (4) are attached to the headers (3) and (4) in an intersecting manner by brazing or welding.

Therefore, in this installed state, the union (10) is
As shown in the figure and FIG. 3, it is located immediately in front of the headers (3) and (4) and facing forward.

FIG. 5 shows another embodiment of the mounting structure for the inlet and outlet pipes (6) and (7). That is, in this embodiment, contrary to the above case, an arcuate peripheral edge (lla) is provided on the header (3) and (4) sides.
A notch hole (11) is formed with a cut hole (11) having a
7) A circular heat exchange medium circulation hole (12) is formed and joined on the side.

Figures 6 and 7 show still another embodiment, in which the union (work 0) of the inlet/outlet pipes (6) (7) is connected to the header (3).
(4) shows a mounting structure in the case of arranging it toward the outside in the axial direction. In this embodiment, the header (3) (4) has one or more flow holes (12) arranged in a row on the outer surface of its peripheral wall, while the inlet/outlet pipe (6) (
The mounting part 7) has a notch hole (11) in the peripheral wall thereof that is long in the axial direction and has an oval shape and has arcuate peripheral edges (lla) at both ends.
is formed, and the communication hole (12) is formed in the cut hole (11).
), the inlet/outlet pipes (6) and (7) are arranged in parallel along the outer peripheral surfaces of the headers (3) and (4),
The inlet/outlet pipes (6) and (7) are attached by joining the mutual contacting surfaces by brazing or the like.

Therefore, in this embodiment, the inlet/outlet pipes (6) and (7) are bent, and the union (lO) is connected to the header (3).
) and (4) at a predetermined distance.

Effects of the Invention By having the above-described configuration, the present invention can provide the following advantages:
Alternatively, in cases where the union needs to be positioned close to the outside of the header in the axial direction of the header, it is possible to easily attach the inlet/outlet pipe to the header with the minimum length of the inlet/outlet pipe and the required machining amount. can. In other words, compared to the case where conventional installation is used, the required length of the inlet/outlet pipe can be made extremely short, and there is no need for complicated bending.
Furthermore, since the space occupied by the inlet and outlet pipes can be reduced, it is possible to make the heat exchanger more compact, lighter, and reduce material costs. Furthermore, since the inlet and outlet pipes are connected to the header by fitting the circumferential wall portions of the pipes into each other from the ends of the pipes, mutual positioning is easy and can be done using an appropriate setting jig. By maintaining their relative positions, it is sometimes possible to join the inlet and outlet pipes to the header and furnace braze the heat exchanger core at the same time, thereby simplifying the manufacturing process of the heat exchanger. It is also possible to reduce the cost.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a perspective view of the main parts showing the state before the inlet and outlet pipes are installed, Figure 2 is a front view of the entire heat exchanger, FIG. 3 is a top view of the inlet/outlet pipe attachment portion, and FIG. 4 is a sectional view taken along the line IV--IV in FIG. 2. FIG. 5 is a perspective view of the main part showing another embodiment, FIG. 6 is a front view of still another embodiment before the inlet/outlet pipe is installed, and FIG.
The figure is a cross-sectional view of a portion taken along the line ■-■ in FIG. 6, showing the state after the same installation. FIG. 8 and FIG. 9 are front views showing a conventional mounting structure for an inlet/outlet pipe, respectively. (1)...tube, (2)...corrugate fin, (3)(4)...header, (6)...inlet pipe,
(7)...Outlet pipe, (1G)...Union, (11
)...cut hole, (lla)...periphery, (12)
...Flow hole. Above 11 ゛q) Go to ○

Claims (1)

[Claims] A large number of flat tubes are arranged in parallel between a pair of headers made of circular tubes, corrugated fins are arranged between adjacent tubes, and a heat exchange medium inlet pipe is provided in the header. and a heat exchanger to which the outlet pipe is connected, wherein a heat exchange medium circulation hole is formed in the peripheral wall of the header and one of the inlet pipe and the outlet pipe, and a peripheral edge is formed in the other peripheral wall. An arcuate cut hole is formed to fit the outer peripheral surface of the heat exchanger medium, and the arcuate periphery of the cut hole is brought into contact with the outer peripheral surface around the heat exchange medium circulation hole to join the two. Installation device for inlet and outlet pipes in exchangers.