JP2889174B2 - Heat exchanger and its airtightness inspection 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 heat exchanger in which a connector for pipe connection is integrally brazed to a header tank of the heat exchanger, and an inspection jig provided with a pipe for an airtight test in this connector. The present invention relates to an airtightness inspection device for a detachable heat exchanger.

[0002]

2. Description of the Related Art Generally, in a parallel flow type heat exchanger, a plurality of tubes and fins are alternately laminated, and a header tank is connected to both ends of the laminated tubes. The upper and lower openings of each of these header tanks are closed by blind caps, an inlet for introducing a heat exchange medium in an appropriate location of one header tank, and a flow outlet for discharging the heat exchange medium in an appropriate location of the other header tank. An outlet is provided, and a partition plate for dividing the inside of the header tank is provided at a required portion of the header tank so that the heat exchange medium flows meandering a plurality of times between the outlet and the inlet.

[0003] A pipe for flowing a heat exchange medium through a block generally called a connector is attached to an outflow port provided in the header tank.

[0004] The connector in the heat exchanger is provided so as to easily connect the pipe to the header tank. Conventionally, the connector is provided in a structure in which the pipe protrudes from the header tank and is connected via a connector. In the above-mentioned conventional connector structure, since the pipe is connected to the connector by protruding, the inconvenience that the dimension of the heat exchanger attached to a place where space is limited is increased.

In order to prevent the size of the heat exchanger from increasing, a connector having a structure in which the heat exchanger is directly fitted to and fixed to a header tank is known (for example, Japanese Utility Model Laid-Open No. 4-25984).
No., Japanese Utility Model Laid-Open No. 6-74877).

In the connector disclosed in Japanese Utility Model Laid-Open Publication No. 4-2594, as shown in FIG. 2 of the publication, a concave portion is formed on the outer peripheral surface of the header tank so as to be fitted to the header tank. A through hole through which the heat exchange medium flows is provided, and the whole is formed in a rectangular shape. And
The recess is fitted to the header tank and fixed by brazing, welding, or the like.

[0007] The connector disclosed in Japanese Utility Model Laid-Open Publication No. 6-74877, as shown in FIG.
A concave mounting surface for mounting on the outer peripheral surface of the header tank is formed, a connection surface for connecting a pipe is formed on another surface, and a through hole forming an opening is formed on the connection surface and the mounting surface. Further, a bracket having a convex shape is integrally formed, and the whole is formed in a rectangular shape. And
The concave mounting surface is fixed to the outer peripheral surface of the header tank.

In general, it is important that the heat exchanger has an airtight structure. After forming the heat exchanger by brazing the above members, before attaching a pipe through which the heat exchange medium flows. It is necessary to perform an airtight test to check for leaks, bypasses, etc., and to check the integrity before installing the piping.

Conventionally, when performing an airtight test, an inspection jig for the airtight test is attached to a connector or a header tank, a pipe for the airtight test is connected to the header tank, and air or gas is sealed in the heat exchanger. And conduct an airtight test.

[0010]

In the conventional connector structure, when the inspection jig for the airtight test is attached, the connector is formed in a rectangular shape, so that the inspection jig can be locked. Therefore, it was difficult to attach the inspection jig.

That is, as shown in FIG. 7, even if the inspection jig 15 for the airtight test is provided with, for example, the chuck 16 as a holding portion, the inspection is performed by the bolt 21 or the like because the connector 20 is formed in a rectangular shape. The jig 15 has to be tightened and attached, and therefore, the number of mounting steps such as tightening of bolts is increased, so that there is a problem that the cost rises.

Accordingly, the present invention provides a heat exchanger configured so that an inspection jig for an airtight test can be easily attached, and an inspection jig provided with a pipe for an airtight test is detachably attached to the connector. It is an object of the present invention to provide an airtightness inspection device for a heat exchanger, which can perform the inspection.

[0013]

According to the present invention, a plurality of tubes and fins are alternately stacked, a header tank is connected to both ends of the stacked tubes, and a connector for pipe connection is connected to the header tank. In the heat exchanger integrally brazed, the connector is a heat exchanger having a mounting portion for locking an inspection jig for an airtight test.

Further, according to the present invention, a plurality of tubes and fins are alternately laminated, a header tank is connected to both ends of the laminated tubes, and a connector for pipe connection is integrally brazed to the header tank. In the heat exchanger, an inspection jig provided with a pipe for an airtight test is detachably attached to the connector, and the connector and the inspection jig have a locking portion that locks each other. It is an airtightness inspection device for a heat exchanger having a configuration provided.

In the case of such a configuration, the inspection jig for the airtight test is attached to the attachment portion of the connector,
It is possible to provide a heat exchanger capable of performing an airtight inspection without increasing the number of steps such as tightening with a bolt as in the related art.

Further, when the connector and the inspection jig are provided with a locking portion for locking each other, the airtightness inspection can be easily performed without increasing the number of steps such as tightening with a bolt. Become.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples shown in the drawings. FIG. 1 is a front view of a heat exchanger 1 according to the present embodiment. In this heat exchanger 1, a plurality of flat tubes 2 and corrugated fins 3 are alternately stacked. Header tanks 4 are connected to both ends, respectively, and upper and lower openings of each header tank 4 are closed by blind caps 5 and brazed integrally. In order to reinforce the flat tubes 2 and the corrugated fins 3, side plates 6 having a U-shaped cross section are provided between the header tanks 4 at the upper end and the lower end of the stacked flat tubes 2. Have been.

In this specific example, the header tank 4 is formed into a round tube shape by rounding, and a partition plate 7 is provided at a required position inside the header tank 4. A block-shaped connector 8 for connecting pipes through which the air flows is fixed.

As shown in FIG. 2, the connector 8 has an arc-shaped mounting surface 9 along the outer peripheral surface of the header tank 4, and an opening of a through hole 10 through which a heat exchange medium flows through the mounting surface 9. 10a, and another opening 10b of the through hole 10 is provided on a pipe connection surface 11 to which an external pipe is connected.
And the communication path 12 is provided. The pipe connection surface 11 is provided with a screw hole 13 for pipe installation, and a flange-shaped mounting portion 14 is formed on both side surfaces of the connection surface 11. The mounting portion 14 is used for an inspection jig 1 described later.
When the test jig 15 is attached, the inspection jig 15 is locked.
It constitutes a locking portion.

In the connector 8, the opening 10a of the through hole 10 formed in the mounting surface 9 is matched with the hole 4a formed in the header tank 4, and the mounting surface 9 is brought into contact with the outer peripheral surface of the header tank 4. It is attached in contact with and fixed by brazing.

In the specific example shown in FIG. 1, a heat exchanger using a header tank formed into a round and tubular shape is shown, but a two-part type header tank which is assembled in a radial direction to form a tubular material. In the heat exchanger using the connector, the connector 8 having the mounting portion 14 as shown in the first specific example is also used.
Can be used to connect the pipes.

The above-described heat exchanger needs to be subjected to an airtight inspection in order to inspect a bypass leak or the like before connecting pipes.

Therefore, as shown in FIGS. 3 and 4, an inspection jig 15 for an airtight test is engaged with a mounting portion 14 formed on the connector 8 in order to perform an airtight test on the heat exchanger. The inspection jig 15 includes a C-shaped chuck 16 serving as a locking portion that is locked to the mounting portion 14 of the connector 8, and a pipe 17 for an airtight test is inserted through the inspection jig body 15 a. . Therefore, the inspection jig 15 slides the chuck 16 to the mounting portion 14 of the connector 8 to lock the connector 8, connects the airtight test pipe 17 to the connector 8, and attaches the inspection tank to the header tank 4. An airtight test is performed by flowing air or the like.

Therefore, the inspection jig 15 for the airtight test can be easily attached to the connector, so that the number of steps for mounting the inspection jig 15 is reduced, and the airtight inspection can be easily performed. .

FIGS. 5 and 6 show another example of the mounting portion 14 provided on the connector 8. FIG. 5 shows an example in which the communication path 12 of the connector 8 is bent at a right angle, and the pipe connection surface 11 is formed. The convex portion 18 formed on the side surface of the mounting portion 14 is configured as the mounting portion 14. 6 has a pair of grooves 19, 19 formed near the pipe connection surface 11 of the connector 8, and this groove 19
Alternatively, the convex portion 18 formed by the groove is configured as the mounting portion 14.

In the present invention, the mounting portion or the locking portion of the connector and the locking portion of the inspection jig are not limited to those described above. Can adopt an appropriate shape and structure as long as both are locked.

[0027]

According to the first aspect of the present invention, a plurality of tubes and fins are alternately stacked, a header tank is connected to both ends of the stacked tubes, and a pipe is connected to the header tank. In the heat exchanger, the connector is integrally brazed, wherein the connector is provided with a mounting portion for locking an inspection jig for an airtight test.

Further, the invention described in claim 2 of the present application is:
In a heat exchanger, a plurality of tubes and fins are alternately stacked, a header tank is connected to both ends of the stacked tubes, and a connector for piping connection is integrally brazed to the header tank. To
An inspection jig provided with a pipe for an airtight test is detachably attached, wherein the connector and the inspection jig have an airtightness inspection of a heat exchanger having a locking portion for locking each other. Device.

Therefore, by attaching the inspection jig for the airtight test to the mounting portion of the connector, a heat exchanger capable of performing the airtight inspection without increasing the number of steps such as tightening with a bolt as in the conventional case. Can be provided.

In the case where the connector and the inspection jig are provided with a locking portion for locking each other, the airtight inspection can be easily performed without increasing the number of steps such as tightening with a bolt. Become.

As described above, according to the present invention, the number of steps for attaching the inspection jig for performing the airtight test can be reduced, and the airtight test can be easily performed. In addition, since the inspection jig for the airtight test can be easily attached, it is possible to avoid the possibility that the tubes and fins which are caused in the mounting process of the inspection jig are crushed, and the airtight test can be efficiently performed. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger according to a specific example of the present invention.

FIG. 2 is an exploded perspective view of a header tank and a connector showing a specific example of the present invention.

FIG. 3 is a perspective view showing a state in which an inspection jig and a pipe for an airtight test are attached to a connector of a header tank.

FIG. 4 is a sectional view taken along the line XX of FIG. 3;

FIG. 5 is a perspective view of a connector showing another specific example of the present invention.

FIG. 6 is a perspective view of a connector showing another specific example of the present invention.

FIG. 7 is a perspective view of a conventional example in which an inspection jig and a pipe for an airtightness test are attached to a connector of a header tank.

[Explanation of symbols]

 Reference Signs List 1 heat exchanger 2 tube 3 fin 4 header tank 4a hole 5 blind cap 6 side plate 7 partition plate 8 connector 9 mounting surface 10 through hole 10a opening 10b opening 11 pipe connection surface 12 communication passage 13 screw hole 14 mounting portion 15 inspection Fixture 15a Inspection jig body 16 Chuck 17 Inspection pipe 18 Convex part 19 Groove 20 Connector 21 Bolt

Claims (2)

(57) [Claims] 1. A heat exchanger wherein a plurality of tubes and fins are alternately stacked, a header tank is connected to both ends of the stacked tubes, and a connector for pipe connection is integrally brazed to the header tank. The heat exchanger according to claim 1, wherein the connector includes a mounting portion for locking an inspection jig for an airtight test. 2. A heat exchanger wherein a plurality of tubes and fins are alternately stacked, a header tank is connected to both ends of the stacked tubes, and a connector for pipe connection is integrally brazed to the header tank. In the apparatus, an inspection jig provided with a pipe for an airtight test is detachably attached to the connector, wherein the connector and the inspection jig are provided with locking portions for locking each other. An airtightness inspection device for a heat exchanger.