JPH04273995A - Double-pipe type heat exchanger - Google Patents

Abstract

PURPOSE:To make a small-sized configuration of a tank part, in particular, and to enable a sufficient strength to be attained in a double-pipe type heat exchanger device in which a heat exchanger such an oil cooler is stored and set in a tank through which cooling fluid for an automobile radiator is flowed. CONSTITUTION:In a heat exchanger 22 constructed by an outer cylinder 23 and an inner cylinder 24 set within a tank 21, each of an inlet port and a discharging port for a heat exchanging fluid of the outer cylinder 23 is formed with an opening 27. The inner cylinder 24 is formed with through-pass openings 291 and 292 in a coaxial manner with the opening 27. A connection pipe 30 is inserted from the opening 27 with its extremity end being passing through the inner cylinder 24 and opened between the outer cylinder 23 and the inner cylinder 24 and they are brazed and fixed. A coupler member 31 is fixed to a part around the other end of the connection pipe 30. The coupler member 31 is oppositely arranged at an inner surface of a fixing port 26 for the tank 21, a coupling pipe 32 formed with a threaded groove at its outer circumferential surface is screwed from an outside part of the tank 21 and then the heat exchanger 22 is fixed at the coupling pipe 32.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-tube heat exchange device used as an oil cooler built into an automobile radiator, for example.

0002

[Prior Art] A heat exchanger in which an oil cooler is installed in a tank that serves as a passage for cooling fluid (cooling water) in an automobile radiator, and the oil circulating in the cooler is cooled by the cooling fluid flowing inside the tank. A device is being considered. Such an oil cooler is constructed of, for example, a double pipe, and is composed of an outer cylinder and an inner cylinder that are set coaxially, and oil, which serves as a heat exchange fluid, flows between the outer cylinder and the inner cylinder. be done. Both ends of the outer cylinder of this heat exchanger are connected to coupling pipes for oil inflow and oil discharge, respectively.

FIG. 2 shows the configuration of a connecting portion of a coupling pipe in a conventional heat exchange device. For example, an outer cylinder 12 and an inner cylinder 13 are coaxially placed in a tank 11 through which cooling water for an automobile radiator flows. A heat exchanger 14 is installed which acts as an oil cooler. This figure shows, for example, an oil inlet, and the outlet has a similar structure.

That is, in this heat exchanger 14, oil, which is a heat exchange fluid, is passed through a ring-shaped passage between the outer cylinder 12 and the inner cylinder 13. Inner fins 15 are arranged.

An opening is formed in the side surface of the outer cylinder 12 corresponding to the oil inlet (outlet), and a cylindrical nipple 16 is integrally attached to this opening by brazing. The end of the nipple 16 on the side opposite to the attachment part to the outer cylinder 12 is taken out of the tank 11 through an attachment hole 17 formed in the wall of the tank 11.

In this case, a flange 161 is formed on the nipple 16 so as to be in contact with the inner surface of the tank 11, and a nut 18 and the flange 161 are screwed onto a portion of the nipple 16 that protrudes from the outside of the tank 11. By sandwiching the wall of the tank 11 between them and tightening and fixing the nipple 16 to the wall portion of the tank 11, the heat exchanger 14 constituted by the outer cylinder 12 and the inner cylinder 13 can be connected to the tank 1 of an automobile radiator.
It is installed and fixed within 1. And this nipple 16
A coupling pipe 19 is screwed and connected to the protruding portion of the tank 11 to the outside.

[0007] Considering the case where the oil cooler configured in this way is housed and installed in the tank 11, the outer cylinder 1
Nipples 16 are integrally attached to the heat exchanger 14, which is made up of a heat exchanger 14 and an inner cylinder 13, corresponding to an oil inlet and an oil outlet, respectively, in order to connect a coupling pipe 19 for flowing oil. ing. Therefore, the width of this heat exchanger 14 is shown as L1 in the figure.

To accommodate such a heat exchanger 14 in the tank 11, the heat exchanger 14 is inserted into the tank 11 through, for example, an opening 111 on the upper side of the tank 11. In this case, since the nipple 16 protrudes from the side of the outer cylinder 12, it may be possible to insert the nipple 16 with the nipple 16 tilted downward. The heat exchanger 14 cannot be housed in the tank 11 unless the tank 11 is provided with the heat exchanger 14.

In order to solve these problems, a heat exchanger as disclosed in, for example, Japanese Patent Application Laid-Open No. 50-57065 has been proposed. In other words, in this heat exchanger, a threaded groove is formed on the inner periphery of the nipple, a coupling tube with a threaded groove formed on the outer periphery is screwed onto the inner periphery of the nipple, and the structure protruding to the outside of the tank is shortened. I'm trying to make it possible.

However, in this case, if the structure integrated with the heat exchanger that protrudes outside the tank is shortened, the length of the threaded groove inside the nipple, that is, the threaded part of the coupling pipe will be shortened. , the coupling length with the coupling tube becomes shorter. Therefore, it becomes difficult to attach it to the tank with sufficient strength.

[0011]

[Problems to be Solved by the Invention] This invention was made in view of the above points, and it is an object of the present invention to set the width of a heat exchanger such as an oil cooler to be small, and to insert this heat exchanger into a tank. In this case, the internal width of this tank can be made smaller and configured without having to be set particularly larger than the width of the heat exchanger, and a connecting pipe for inflowing and discharging the heat exchange fluid to and from the heat exchanger is also provided. The object of the present invention is to provide a double-tube heat exchange device in which the heat exchangers are connected with sufficient strength and the heat exchanger can be attached to the tank with sufficient strength.

0012

[Means for Solving the Problems] In the double pipe heat exchange device according to the present invention, a double pipe heat exchanger is housed in a tank through which cooling fluid flows. Openings are formed in the outer cylinder that correspond to the inflow and discharge parts of the heat exchange fluid, respectively, and through openings are formed in the inner cylinder coaxially with these openings, so that the inner cylinder passes through the opening of the outer cylinder. A connecting pipe having a thread groove formed on the inner periphery is inserted through the opening, and brazed so that the tip thereof is opened into a heat exchange fluid flow path between the outer cylinder and the inner cylinder. Then, the other end of this connecting pipe is set in a mounting hole formed in the side wall of the tank, and a connecting pipe with a thread groove formed on the outer periphery from outside the tank is screwed into the connecting pipe, and this connecting pipe is used to connect the connecting pipe. Ensure that the heat exchanger including the tubes is installed and fixed within the tank.

[0013]

[Operation] In the double-tube heat exchange device configured in this way, the heat exchanger, which is composed of an outer cylinder and an inner cylinder including the connecting pipes, has components that protrude to the outside of the tank. do not. Therefore, the width of this heat exchanger portion can be configured to be equal to the interval between the inner walls of the tank, which is effective in reducing the size of the tank. In addition, a connecting pipe for inflowing and discharging the heat exchange fluid is connected to a connecting pipe that is set to penetrate the inner cylinder and have a sufficient length, and this connecting pipe connects the heat exchanger to the tank. Since the heat exchanger can be attached to the tank, it is possible to obtain sufficient bonding strength between the coupling tube and the heat exchanger, as well as sufficient strength for attaching the heat exchanger to the tank.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows its cross-sectional structure. For example, a tank 21 installed at the bottom of an automobile radiator.
A heat exchanger 22 is set within. Although not shown in this figure, the tank 21 has a plurality of heat exchange tubes arranged in series on its upper side, and the upper ends of these tubes are commonly communicated with another tank. Cooling water for an automobile engine is circulated in the tank 21 as a cooling fluid.

The heat exchanger 22 has a double-tube structure including an outer cylinder 23 and an inner cylinder 24 positioned coaxially inside the outer cylinder 23. A heat exchange fluid flow path having a ring-shaped cross section is formed. When this heat exchanger 22 constitutes, for example, an oil cooler, oil is used as the heat exchange fluid, and inner fins 25 are set in the flow passage that becomes the oil passage.

An inlet for supplying heat exchange fluid to the heat exchanger 22 and an outlet for discharging the heat exchange fluid are connected to the outer cylinder 23.
is formed close to both ends of. This figure shows the cross-sectional structure of one of the inlet and the outlet, for example, the inlet part, and the outlet part, which is not shown in the figure, has the same structure.

A mounting port 26 is opened in the side wall of the tank 21, corresponding to the position of the inlet (outlet) of the heat exchange fluid. Further, an opening 27 is formed in the outer cylinder 23 so as to be coaxial with the attachment port 26.
A cylindrical body 28 is formed around the cylindrical body 28 by burring.

Furthermore, the inner cylinder 24 has an opening 27 in the outer cylinder 23.
Through openings 291 and 292 are formed coaxially with the cylindrical body 28, into which the connecting pipe 30 is inserted and set. This connecting pipe 30 is composed of a cylindrical body in which a thread groove forming a female thread is formed on the inner circumferential surface, and its tip passes through the inner cylinder 24 and connects the outer cylinder 23 and the inner cylinder on the surface opposite to the opening 27. It is opened to a flow passage for heat exchange fluid between the heat exchanger and the heat exchanger 24. And inner cylinder 2
The surroundings of the through openings 291 and 292 of No. 4, the outer circumference of the connecting pipe 30, and the inner circumference of the cylindrical body 28 are integrally connected by brazing, respectively, to prevent leakage of the heat exchange fluid in the flow path. I'm trying to prevent it from happening.

A joint member 31 is integrally attached around the other end of the connecting tube 30 by brazing. This joint member 31 is installed opposite to the inner surface around the attachment port 26 of the tank 21. With this joint member 31 installed opposite to the inner surface of the tank 21, the connecting pipe 30 is connected to the tank 21.
I try not to get pushed out from the beginning.

A coupling pipe 32 is inserted into the connecting pipe 30 from the outside of the tank 21 . This connecting tube 32 has a thread groove forming a male thread formed on its outer periphery, so that the connecting tube 32 can be connected to the connecting tube 30 by screwing. Oil, which is a heat exchange fluid, is supplied to this coupling pipe 32.

A brim-like flange 33 is provided on the outer periphery of the coupling pipe 32.
are integrally formed, and this flange 33 is connected to the tank 2.
The connecting tube 32 is screwed onto the connecting tube 30 until it contacts the outer surface of the connecting tube 30 . Here, the flange 33 of the coupling pipe 32 and the tank 2
By interposing a gasket 34 appropriately between the outer surface of the connecting pipe 30 and the connecting pipe 30,
The wall of the tank 21 is held between the flange 33 and the joint member 31. Reference numeral 35 denotes an O-ring for sealing the cooling fluid, which is set between the joint member 31 and the inner wall of the tank 21.

That is, in the double-tube type heat exchange device constructed in this way, the connecting pipe 3 is housed in the heat exchanger 22 constituted by the outer cylinder 23 and the inner cylinder 24.
0 is now set, and the coupling pipe section does not protrude from the side of the heat exchanger 22. Therefore, since the width of the heat exchanger 22 is set to be sufficiently small and there are no components that protrude from the surface of the tank 21, when the heat exchanger 22 is inserted into the tank 21, There is no need to set a large clearance on the side of the heat exchanger 22.

Furthermore, since the connecting tube 32 is screwed onto the connecting tube 30 whose length to penetrate the inner tube 24 is set, the strength of the connection between the connecting tube 30 and the connecting tube 32, that is, Sufficient bonding strength between the heat exchanger 22 and the coupling tube 32 can be obtained. The heat exchanger 22 is fixedly installed in the tank 21 by the coupling pipe 32 that is coupled to the heat exchanger 22 with sufficient strength in this manner.

[0024]

[Effects of the Invention] As described above, in the double pipe heat exchange device according to the present invention, the heat exchanger constituted by the double pipes can be easily inserted into the tank, and the connecting pipes can be tightened. In particular, since there are no components in the heat exchanger that protrude outside the tank, the tank can be easily miniaturized and configured. At the same time, the connecting tubes are connected using a connecting tube that can be set to a sufficient length, and therefore the attachment strength can be made sufficient.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram illustrating a double pipe heat exchange device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram showing a conventional heat exchange device.

[Explanation of symbols]

21...Tank, 22...Heat exchanger, 23...Outer cylinder, 24...Inner cylinder, 26...Attachment port, 27...Opening, 291, 292...Through opening, 30...Connecting pipe, 31...Joint member, 32...Joining pipe .

Claims (1)

[Claims] Claim 1: A tank through which a cooling fluid flows, an outer cylinder that is set in contact with the cooling fluid, and an inner cylinder that is provided so that the same central axis is set inside the outer cylinder. A heat exchange fluid is passed between the outer cylinder and the inner cylinder, and the heat exchange fluid is communicated with the flow path to form an inlet and an outlet for the heat exchange fluid, respectively. In the heat exchanger, openings formed in the side wall of the outer cylinder at positions corresponding to the inlet and outlet, respectively, and through openings formed in the inner cylinder coaxially with these openings, respectively, in a coaxial state. are commonly inserted into the opening of the outer cylinder and the through opening of the inner cylinder, and the contact portions with the outer cylinder and the inner cylinder are brazed, and the tip opening penetrates the inner cylinder. a connecting pipe having a threaded groove formed on its inner periphery and opening into the flow path of the heat exchange fluid; a joint member disposed opposite to the inner surface of the attachment port formed in correspondence with the positions of the inlet and the outlet, and a connecting pipe having a thread groove formed on the outer periphery to be screwed into the connecting pipe from the outside of the tank. A double-pipe heat exchange device, characterized in that the heat exchanger including the connecting pipe is attached and fixed to the wall of the tank by the connecting pipe.