JPH04273996A - Heat exchanger device - Google Patents

Abstract

PURPOSE:To make a small-sized configuration of a tank part, in particular, and enable sufficient strength to be attained at the tank part in a heat exchanger device in which a heat exchanger such as an oil cooler of a double- piped type through which cooling fluid for an automobile radiator flows is stored and set in the tank. CONSTITUTION:A heat exchanger 22 is constructed by an outer cylinder 23 and an inner cylinder 24 in which the same central axis is set. An outer cylinder 23 is formed with an opening in correspondence with a flowing part and a discharging part of heat exchanging fluid of the outer cylinder 23 and then a hub 25 is formed from this opening part toward an outside part. A cylinder part of the hub 25 is formed with a threaded groove at its inner circumference, a cylindrical coupler member 26 is brazed and fixed. This coupler member 26 is contacted with an outer edge of a fixing hole 27 of the tank 21 and then the heat exchanger 22 is set within the tank 21. An extremity end of the coupler pipe 29 is inserted into and threadably engaged with the coupler member 26 from an outside part of the tank 21, and this heat exchanger 22 is fixed to a side wall of the tank 21 by a nut 31 screwed to an outer circumference of the coupler pipe 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger comprising a double-pipe heat exchanger, which is 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. 4 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 is conceivable to insert the nipple 16 with the nipple 16 facing 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. It is an object of the present invention to provide a 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 heat exchange device according to the present invention, a double-pipe heat exchanger is housed in a tank, and heat is exchanged in an outer cylinder constituting the heat exchanger. Openings are formed corresponding to the fluid inflow and discharge portions, respectively, and a boss portion is formed outside the openings. Then, a joint member that contacts the inner surface of the tank is integrally connected to this boss part,
This joint member is brought into contact with the inner surface of the tank opening, and a coupling pipe inserted from outside the tank is screwed into a threaded groove formed on the inner surface of the joint member. Then, the tank wall portion is tightened by the joint member and a nut screwed onto the outer periphery of the coupling pipe, and the heat exchanger is held and fixed within the tank. In this case, O-rings for sealing are interposed between the tip of the coupling tube and the joint member, and between the joint member and the inner surface of the tank.

[0013]

[Operation] In the heat exchange device constructed in this manner, only a joint member that contacts the inner surface of the tank is attached to the heat exchanger composed of an outer cylinder and an inner cylinder. Therefore, the width of this heat exchanger is set to be sufficiently small, making it easy to insert it into the tank and making it possible to downsize the tank. In addition, the joint member is connected to the joint member by inserting it from the outside of the tank, and the joint member is firmly tightened and fixed to the tank wall by a nut screwed onto the outer periphery of the joint pipe, providing sufficient strength. can be guaranteed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows its configuration. A tank 21 is set, for example, at the bottom of an automobile radiator, and engine cooling water is distributed as a cooling fluid. A heat exchanger 22 constituting an oil cooler is set to extend along the path.

The heat exchanger 22 has a double-tube structure, and is composed of a cylindrical outer cylinder 23 and an inner cylinder 24. The inner cylinder 24 is aligned with the central axis of the outer cylinder 23.
axis has been set. Oil to be cooled, that is, a heat exchange fluid, flows through the passageway between the outer cylinder 23 and the inner cylinder 24, which has a ring-shaped cross section. That is, the heat exchanger 22 has a cylindrical shape, and has an inlet for introducing the heat exchange fluid and an outlet for discharging the heat exchange fluid, corresponding to both ends thereof.

This figure shows, for example, the cross-sectional structure of the inlet portion, and the inlet of the heat exchange fluid is connected to the outer cylinder 2.
It is constructed by forming an opening on the side surface of 3. A boss 25 formed of a material constituting the outer cylinder 23 is formed at the opening of the outer cylinder 23.
extends laterally from the periphery of the opening in a cylindrical shape 251, and further has a large diameter portion 252 opened outward.

Inside the cylinder 251 of this boss 25,
A joint member 26 is inserted and integrally connected by brazing, and the length of the joint member 26 is set within a range that does not protrude from the boss 25, and a female thread is formed on the inner peripheral surface. It is composed of a cylindrical body with grooves formed therein. Further, the inward end of the joint member 26 is set so as not to reach the outer periphery of the inner cylinder 24, and a tapered surface 261 is formed on the inner periphery of the tip. In order to reduce the flow resistance of the heat exchange fluid, the distance between the two is set sufficiently.

The joint member 26 set corresponding to the inlet of the heat exchanger 22 is installed opposite to the inner surface of the mounting hole 27 formed on the side surface of the tank 21, and is connected to the boss 2.
A sealing O-ring 28 is fitted inside the large-diameter portion 252 of the tank 21 and is in contact with the periphery of the attachment hole 27 on the inner surface of the wall of the tank 21. Then, from outside the tank 21, the distal end of the coupling tube 29, which has a threaded groove constituting a male thread formed on its outer periphery, is inserted into the joint member 26, and is screwed and tightened.

In this case, a ring-shaped notch groove 26 is formed in the joint member 26 corresponding to the position where the distal end of the coupling tube 29 hits.
2 is formed, and the O-ring 30 is set within this notch groove 262. Then, an oil (heat exchange fluid) seal is formed between the coupling pipe 29 and the joint member 26.

That is, the heat exchanger 22 and the joint member 26 are integrally constructed, and this structure is inserted into the tank 21 as shown in FIG. 2 and set at the position of the mounting hole 27 of the tank 21. . Then, the coupling pipe 29 is inserted through the attachment hole 27 of the tank 21, and the joint member 26
The connecting tube 29 is attached to the heat exchanger 22 by screwing into the connecting tube 29, so that the heat exchange fluid passage between the outer cylinder 23 and the inner cylinder 24 and the connecting tube 29 are communicated with each other. After that, by screwing the nut 31 onto the outer periphery of the coupling pipe 29 from the outside of the tank 21 and tightening it with the joint member 26,
A heat exchanger 22 is fixedly set within the tank 21 . In this case, the inside of the tank 21 is sealed by the O-ring 28, and leakage of the cooling water in the tank 21 is prevented.

In the figure, reference numeral 32 denotes an inner fin set in the heat exchange fluid passage between the outer cylinder 23 and the inner cylinder 24;
Reference numeral 33 denotes a tube through which a cooling fluid constituting the radiator flows. A plurality of tubes 33 are provided and communicated with the tank 21, and are commonly communicated with another tank above.

In the heat exchange device constructed in this manner, the length of the joint member 26 may be set to such a length that the distal end of the coupling pipe 29 can be threadedly connected. There is no need to lead out the member 26 to the outside of the tank 21. Therefore, for the width of the heat exchanger 22, the tank 2
It is not necessary to set the internal width of the heat exchanger 1 particularly large, and for example, a clearance of about 1 to 2 mm relative to the width of the heat exchanger 22 may be set. This heat exchanger 22 does not need to be assembled at an angle in order to pull out the part connected to the coupling pipe 29 from the side wall of the tank 21, and the assembly workability becomes very good.

[0023] In the above explanation, the inlet portion of the heat exchange fluid has been explained, but the outlet portion of the heat exchange fluid is also constructed in the same way, and a connecting pipe serving as a discharge pipe of the heat exchange fluid is connected. will be done.

In this case, the coupling strength between the coupling tube 29 and the heat exchanger 22 can be sufficiently obtained by screwing the tip of the coupling tube 29 into the joint member 26, and the O-ring 30 is used to exchange heat with oil, etc. A sufficient fluid sealing structure can also be obtained. Further, the heat exchanger 22 is firmly attached and fixed to the side wall of the tank 21 by the joint member 26 and the nut 31 screwed onto the outer periphery of the coupling pipe 29, and the attachment strength is sufficient. Further, the inside of the tank 21 is reliably sealed by the O-ring 28, and leakage of cooling fluid such as cooling water is prevented.

FIG. 3 shows a second embodiment, which is basically the same as the embodiment shown in FIG. 1, so the same components are given the same reference numerals and their explanation will be omitted. That is,
In this embodiment, the structure of the boss 25 that holds the joint member 26 is only a cylinder 251, the joint member 26 is inserted into the inner periphery of the cylinder 251, and the outer periphery thereof is brazed. Further, a flange-like flange 263 is formed in a portion of the joint member 26 that faces the inner surface of the tank 21, and this flange 263
63, the O-ring 2 is attached to the part facing the inner surface of the tank 21.
A ring-shaped cutout groove 264 is formed to accommodate the ring. Further, in the embodiment described above, the notch groove 262 was formed in the joint member 26 portion facing the tip of the coupling tube 29, but in this embodiment, such a notch groove is omitted, and the coupling tube 29
An O-ring 30 is sandwiched between the tip of the joint member 26 and the joint member 26.

[0026]

Effects of the Invention As described above, according to the heat exchange device according to the present invention, in a double pipe heat exchanger that is housed in the tank of an automobile radiator, the heat exchanger is housed in the tank. The assembly work is sufficiently simplified, and the tank shape is sufficiently miniaturized. The structure can be ensured and the mounting strength can be made sufficiently strong. Therefore, it can be effectively used, for example, as an oil cooler for automobiles.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating a heat exchange device according to an embodiment of the present invention.

FIG. 2 is an exploded view showing the heat exchanger according to the above embodiment.

FIG. 3 is a sectional view illustrating a second embodiment of the invention.

FIG. 4 is a sectional view showing a conventional heat exchange device.

[Explanation of symbols]

21...Tank, 22...Heat exchanger (oil cooler body),
23...Outer cylinder, 24...Inner cylinder, 25...Boss, 26...Joint member, 27...Mounting hole, 28, 30 O-ring, 29...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, a cylindrical boss is formed integrally with the outer cylinder so as to surround openings formed in portions corresponding to the inlet and outlet of the outer cylinder, and a cylindrical boss is integrally formed inside the boss. a cylindrical joint member having a threaded groove on its inner circumferential surface and configured to be attached so as not to come into contact with the outer circumferential surface of the inner cylinder through at least the opening; mounting holes formed corresponding to the respective discharge ports, and inserted into the tank from the outside of the tank through the mounting holes,
a coupling pipe for heat exchange fluid inflow and discharge, the outer periphery of which is formed with a thread groove that is screwed into the thread groove of the coupling member, and a contact portion between the distal end of the coupling pipe and the distal end of the coupling pipe of the coupling member; and a sealing O-ring set at a contact portion between the joint member and the inner surface of the tank around the mounting hole, and the joint member is brought into contact with the inner surface of the tank via the O-ring, and the joint member is in contact with the inner surface of the tank through the O-ring. A heat exchange device characterized in that the joint member is tightened and fixed to a tank wall by a nut that is screwed onto the outer periphery of the coupling pipe at the outer periphery.