JPH0247470Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a brazing inspection device, in which a pair of pipes are inserted and a plate is brazed, and gas leaks from the brazed portion due to poor brazing. It has an inspection function that can simultaneously inspect for clogging in the interior of the pair of pipes.

(Prior art) A plate in which a pair of pipes are inserted and brazed is applied to a working hole in a fuel tank, other tank, liquid container, etc., and the liquid or gas filled inside is passed through the pipes to the container. These are for taking out to the outside, and before attaching the plate to the container, an inspection device is used to check for defects in brazing that may cause gas leaks, and only those that pass the inspection are used. .

However, even if there is raw metal attached to the mouths of the pair of pipes, or there are raw metals or other foreign substances that narrow the radius inside, the gas leakage test will pass. If the plate is partially or completely clogged, the plate cannot be used, which has the disadvantage of requiring a separate inspection device from the gas leak inspection device.

(Problem to be solved by the invention) When a pair of pipes are clogged, the invention solves the problem of the flow rate at one end of the other pipe protruding from the inspection chamber into which pressurized inspection air is sent. By taking advantage of the fact that the pressure at one end of the other pipe drops, and using a reset timer to detect whether the pressure at one end of the other pipe rises to the specified level within the time period set in the timer, it is possible to perform a gas leak test in parallel with the gas leak test. The purpose of this is to enable simultaneous inspection of pipe clogging.

(Means for Solving the Problems) The present invention constitutes a means for achieving the purpose stated in the previous section, and is a method of inserting a pair of pipes into a brazed plate and placing it in the inspection chamber of an inspection device. In an apparatus for inspecting gas leakage from a brazed part by holding the pipe in a watertight manner, connecting an inspection pressurized air supply hose to one end of the pipe in a detachable manner, and filling the inspection apparatus with a gas leakage inspection liquid, In addition to providing a reset timer, a pressure meter is freely attached and detached to one end of the other pipe, and the pressure meter detects the pressure that rises during the time period set on the reset timer to check for gas leaks and detect blockages inside the pair of pipes. This relates to a brazing inspection device that inspects in parallel with the above.

A preferred embodiment of the present invention is described in the next section.

(Example) In the figure, 1 indicates a brazing inspection device, and the water level W
It is provided in a tank 6 that can be raised and lowered, or put into the tank 6 and pulled up. The water level W in the tank 6 is kept constant when lifting is performed.

A slightly soft packing 3 made of rubber or the like is provided on the upper surface of the upper opening of the testing chamber 2, which has only the upper part open and the rest watertight in the testing apparatus 1. Plate 11
and a presser rod 5 that presses down to make it pressure-resistant and gas-tight.

The plate 11 is formed by inserting a pair of pipes 12 and 13, fixing the inserted portions by brazing, and providing a gas-tight seal.
The other end of plate 11 protruding from the lower surface of plate 11 protrudes into the examination chamber 2. At one end of the pipe 12, a pusher 16 is attached to the rod 18 of the cylinder 17, to which a frame 15 for supporting the packing 14 is fixed.
A pressurized air supply device 19 is provided which connects and separates the air by expanding and contracting the pressurized air, and connects and separates the air supply tube 20 attached to the presser 16 between the presser 16 and the gasket 1.
4, and the air is fed into one end of the one pipe 12, and the air feed pipe 20 is provided with a solenoid valve 21. (The electromagnetic valve 21 is not necessarily provided, and pressurized air can be automatically sent from the air supply pipe 20 as the rod 18 expands.) Pressurized air is supplied to one end of the other pipe 13. Similar to the device 19, a presser 24 with a frame 23 fixed to the tip that supports a gasket 22 is attached to the cylinder 2.
A pressure meter connecting device 27 is provided which connects and separates the pressure meter by expanding and contracting the rod 26 of No. 5.
The pressure in the inspection chamber 2 is drawn out from one end of the pipe 13 by communicating the tube space of the meter tube 28 attached to the presser 24 and the packing 2, and the meter tube 28
Connect pressure meter P to.

Further, a reset timer T is electrically connected to the cylinder 17, which operates in synchronization with the supply of pressurized air to extend the rod 18. When an electromagnetic valve 21 is provided, the reset timer T can also be wired to be driven in synchronization with the valve opening signal of the electromagnetic valve 21.

The reset timer T includes a pair of pipes 12,
13, when there is no clogging that becomes a resistance that delays the supply of air, a time limit is set synchronized to the time when the pressure meter P is read at a certain time to indicate a predetermined pressure. Ideally, the reset timer T should sound a buzzer or blink a lamp when the set time expires.

The meter pipe 28 in Fig. 1 has an air tank 29 that stores pressure up to about 0.8 kg as shown in Fig. 2.
and the inlet pipe of the pressure meter P can be provided in communication with each other. In this case, after the air tank 29 stores the set pressure, the pressure meter P will read, for example, 0.8
Since the pressure rises to more than Kg pressure, pipes 12 and 13
The detection speed can be prevented from being too fast by delaying the time for detecting defects due to clogging and by increasing the set time limit of the reset timer T. The capacity and pressure of the air tank 29 can be selected freely, depending on the performance of the device.

(Function) The present invention has the above-mentioned configuration, the plate 11 is attached to the inspection device 1, the water level of all parts other than the inspection chamber 2 is kept below the water level of the test liquid, and pressurized air is supplied from the air supply pipe to one end of the pipe 12. The pressure in the inspection chamber 2 is increased by the air flowing out from the other end of the pipe 12. If the brazed part of the plate 11 is defective, the defect is detected by leaking air bubbles 30 as shown in the figure. If either of 12 or 13 is clogged which causes poor air circulation, even if the time limit set in reset timer T has expired,
A pressure meter P communicating with one end of the other pipe 13
Since the needle does not rotate as quickly as it would when it is not clogged, it is immediately obvious that the predetermined pressure is not reached, and it is discovered in relation to the reset timer T that the pipes 12 and 13 are defective. Can be done.

(Effects) The present invention has the above-described structure and operation, and a reset timer T and a pressure meter P connected to one end of one pipe 13 are removably attached,
When the time limit set in the reset timer T expires, the pressure meter P detects a predetermined air pressure or is lower than the predetermined air pressure by checking whether the pressure meter P detects gas leakage due to poor brazing of the plate. In parallel with the detection, clogging of either or both pipes 12 and 13 can be detected. Through this parallel inspection, it is possible to detect clogging of the plate 11 through the pair of pipes 12 and 13. This has the effect of improving inspection efficiency and completely eliminating defective products.

[Brief explanation of the drawing]

FIG. 1 of the accompanying drawings is a partially cutaway side view of an embodiment of the present invention. FIG. 2 shows a modified embodiment. 1... Inspection device, 2... Inspection room, 4... Rod, 5... Presser bar, 6... Tank, W... Water level,
11...Plate, 12, 13...Pipe, 16
... Pressure element, 19 ... Pressurized air supply device, 20
...Air supply pipe, 21...Solenoid valve, 24...
...Press element, 27...Meter connection device, 28...Meter tube, P...Pressure meter, T...Reset timer.

Claims (1)

[Scope of utility model registration request] A plate with a pair of pipes inserted through it and brazed is held watertight in the inspection chamber of the inspection device, and an inspection pressurized air supply hose is freely connected to one end of the pipe, and the gas is connected to the inspection device. In a device that tests for gas leaks from brazed parts by filling it with a leak test liquid, a reset timer is provided, and a pressure meter is attached to one end of the other pipe in a freely detachable manner so that the pressure rises during the time set on the reset timer. A brazing inspection device that detects pressure with a pressure meter and inspects for clogging inside the pair of pipes in parallel with a gas leak inspection.