JPH0249555Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a jig for inspecting leakage of air fin tubes in plug-type air fin cooler boxes. This invention relates to a jig that can be inspected quickly and reliably.

[Conventional technology]

Generally, air fin cooler boxes are known as a cover type as shown in FIG. 2 and a plug type as shown in FIG. 3. Leakage inspection of the air fin cooler box 10 and the fin tube 9 has conventionally been carried out by attaching a pressure gauge to the air vent part 11 and by attaching a pressure gauge to the drain part 1.
2, this was done by introducing a gas such as air under pressure.

[Problem that the invention attempts to solve]

However, in the conventional leakage test described above, it is easy to determine whether or not there is a leak, but it is difficult to determine whether there is a leak in the main body of the air fin cooler box 10, the joint with the finch tube, the tightening portion of the plug 13 or cover 14, and each finch tube 9. The disadvantage was that it required a great deal of time and effort to search for leakage points.

Therefore, the purpose of this invention was to conduct research to develop a jig that can promptly detect air fin tube leaks in plug-type air fin cooler boxes among the conventionally known cover-type and plug-type air fin cooler boxes. Layered.

[Means for solving problems]

As a result, we developed a jig that can be inserted directly into the air finch tube to be inspected in a sealed state to conduct leakage inspections.

The present invention will be explained based on FIGS. 1 and 3. The present invention is a jig for inspecting leakage of an air fin tube in a plug type air fin cooler box, and includes a tapered tip 6. and a hollow cylindrical body 5 having a thread 7 formed on its outer periphery, a thread threaded on its inner periphery to be screwed into the thread 7 of the hollow cylindrical body 5, and a thread formed on its outer periphery after the plug is removed. It consists of a fixing screw 4 having a thread that engages with a thread formed in the plug hole, a valve 1 and a pressure gauge 2, and the hollow cylindrical body 5, valve 1 and pressure gauge 2 are connected to a T-joint 3. The present invention provides a leakage inspection jig for an air finch tube connected via a

The jig of the present invention is constructed by connecting the hollow cylindrical body 5, the valve 1, and the pressure gauge 2 via the T-joint 3 as described above. Here, the hollow cylindrical body 5 has a tip 6
It has a tapered shape and is designed to be inserted into the air finch tube 9 in an airtight manner as shown in FIG. Further, a screw thread 7 is formed on the outer periphery of the hollow cylindrical body 5, and at the same time, a fixing screw 4 is attached so as to be screwed into the thread thread 7. This screw thread 7 is formed by inserting the fixing screw 4 into the hollow cylindrical body after inserting the jig into the air fin tube 9 through the plug hole from which the valve 13 was extracted (through the wall surface of the air fin cooler box). 5 outside the wall surface penetration part (in other words, the hollow cylindrical body 5
(the outside of the wall and the inside of the penetrating wall)
It suffices if it is formed so that it can be tightly fixed. Therefore, this thread 7 may be formed over the entire outer circumference of the hollow cylindrical body 5, but usually the thread 7 is formed on the first
As shown in the figure, it is sufficient to form it not from the tip 6 to the front part, but from the middle part to the rear.

In the jig of the present invention, the end (terminus) opposite to the tip 6 of the hollow cylindrical body 5 is connected from one side of the T-joint 3, and the pressure gauge 2 is connected to the other end of the T-joint 3. The valve 1 may be connected from the remaining connection port of the T-joint 3. The pressure gauge 2, valve 1, and T-joint 3 used in this case are not particularly limited, and commercially available ones are sufficient as long as the dimensions match. Here, the valve 1 is connected to the T-joint 3, and at the same time, an inspection gas inlet 8 is formed on the opposite side thereof.

[Effect]

In order to check for leakage in the air fin cooler box using the jig of the present invention, as shown in FIG. Insert the jig tip 6 into the finch tube 9 and bring it into close contact with the inner surface of the tube. In addition, in order to improve the contact surface between the inner surface of the tube and the tip 6 of the jig, it is preferable to shave the inner surface of the tube in advance using a reamer with the same taper as the tip 6 to increase the degree of adhesion. Become.

Furthermore, it is necessary to tightly fix the hollow cylindrical body 5 of the jig to the plug hole after the plug 13 is removed in the air fin cooler box. Move the fixing screw 4 whose inner periphery is screwed into the screw thread 7 in the plug hole, and screw the screw thread formed on the outer periphery into the screw thread formed in the plug hole. It can be fixed by tightening the fixing screw 4. Note that the jig tip 6 is attached to an air finch tube 9.
A spanner or the like may be used to insert or pull out the hollow cylindrical body 5. For this purpose, it is convenient to provide a spanner tightening portion 15 at an appropriate location on the outer periphery of the hollow cylindrical body 5.

As mentioned above, after attaching the jig of the present invention to the air fin cooler box and tightly inserting the jig tip 6 into the air fin cooler box 9, loosen the valve 1 to supply a test gas (usually air, etc.). The gas is introduced into the air finch tube 9 from inside the hollow cylindrical body 5 and the tip 6 of the jig through the gas inlet 8, and the leak inside the tube is inspected. Note that it is preferable to attach a gas venting valve to the opposite end of the air finch tube 9. If there is a leak in the air finch tube 9, the pressure displayed on the pressure gauge 2 will drop, so the presence or absence of a leak can be immediately determined. Moreover, since the airtightness between the jig tip and the air finch tube is sufficient, and the jig tip is directly and closely inserted into the air finch tube to be inspected, the pressure drop during the inspection is reduced. It can be immediately determined that the air finch tube is leaking, and there is no need to consider other causes.

〔effect〕

Therefore, according to the jig of the present invention, it is possible to reliably check each air fin tube for leakage. In addition, the jig of the present invention can utilize the plug hole after the plug is removed in a plug-type air fin cooler box, so there is no need to modify the air fin cooler box in any way, and the manufacturing cost is low. It also has the practical benefits of being easy to operate.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the jig of the present invention;
Fig. 2 is an explanatory diagram showing an example of a cover type air fin cooler box, Fig. 3 is an explanatory diagram showing an example of a plug type air fin cooler box to which the present invention is applied, and Fig. 4 is an explanatory diagram showing an example of a plug type air fin cooler box to which the present invention is applied. FIG. 2 is an explanatory diagram showing a state in which the jig of the present invention is attached to an air-fin cooler box. 1... Valve, 2... Pressure gauge, 3... T-joint, 4... Fixing screw, 5... Hollow cylindrical body, 6...
...Tip, 7...Screw thread, 8...Gas inlet, 9
...Air finch tube, 10...Air finch cooler box, 11...Air vent part, 12
...Drain part, 13...Plug, 14...Cover plate, 15...Spanner tightening part.

Claims (1)

[Scope of utility model registration request] This is a jig for inspecting leakage of an air fin tube in a plug type air fin cooler box, and includes a hollow cylindrical body 5 having a tapered tip 6 and a threaded thread 7 formed on the outer periphery, and A fixing screw having a thread on its periphery that engages with the thread 7 of the hollow cylindrical body 5, and a fixing screw that has a thread on its outer periphery that engages with the thread formed in the plug hole after the plug is removed. 4. A leakage testing jig for an air finch tube comprising a valve 1 and a pressure gauge 2, the hollow cylindrical body 5, the valve 1, and the pressure gauge 2 being connected via a T-joint 3.