JP3065777U - Leak inspection device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To surely inspect a product for leakage in a short time without being influenced by the capacity of the product. A connecting pipe provided with a coupler at one end, a vacuum pump at the other end, and an atmosphere release valve between one end and another end, a pressure gauge, a vacuum pump, and an atmosphere release valve. And a controller 26 for controlling the pressure gauge 24 and judging a leak. After sealing the other opening J of the inspection object W, the coupler 16 is attached to one opening J and After the inside of the inspection object W is made substantially vacuum, the pressure of the inspection object W left until the pressure becomes a constant value is defined as a first measurement value a, and the pressure after a predetermined time elapses is defined as a second measurement value b. Is used to check for a leak based on the difference between the two measured values a and b.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an apparatus for inspecting a product formed by casting, welding forming, die forming, pipe expansion forming, etc., for leakage due to small holes, cracks, flaws, molding defects, and the like.

[0002]

[Prior art]

 Conventionally, as a method for inspecting the presence or absence of leakage of various products, it is known that all openings of the product are sealed, submerged in an inspection water tank, and an operator visually checks the leakage due to outflow of air. ing.

[0003]

[Problems to be solved by the invention]

 In the past, as described above, when inspecting for product leakage, the product was submerged and the outflow of air was visually checked by the operator. Had been a problem.

[0004] In addition, when the product volume is large, buoyancy acts so much that the product cannot be submerged in the water tank for inspection, and there has been a problem that the inspection cannot be performed.

[0005] Further, after the inspection, water easily adheres to the product, and in the case of a product using a material containing iron, the product is easily rusted. Therefore, it is necessary to remove water from the product after the inspection. Work time.

The present invention has been made in view of the above-described drawbacks, and has as its object to provide a leakage inspection device that can reliably inspect a product for leakage in a short time without being affected by the capacity of the product. Things.

[0007]

[Means for Solving the Problems]

 The present invention has a coupler at one end that connects to the opening of the test object, a vacuum pump at the other end that makes the inside of the test object substantially vacuum, and an air release valve that takes in air between one end and the other end. Pressure gauge to measure the pressure in the connection pipe on the connection side with the test object, and the vacuum pump, start and stop the vacuum pump, open and close the air release valve, display the measured value of the pressure gauge, and measure the measurement time interval. A controller that determines that there is no leak if the difference between the first and second measured values measured by the pressure gauge is within a predetermined range, and determines that there is a leak if the difference is outside the predetermined range. After sealing other openings except for one opening of the inspection object, a coupler of the connecting pipe is attached to one opening of the inspection object, and the vacuum pump at the other end of the connecting pipe is driven to drive the inside of the inspection object. After the pressure in the test object becomes substantially constant, The pressure in the test object immediately after standing is measured by a pressure gauge, and this measured value is used as a first measured value. The pressure in the test object immediately after a predetermined time has elapsed is measured by a pressure gauge. Is used as the second measurement value, and the controller determines that there is no leak if the difference between the two measurement values is within the predetermined range, and judges that there is leakage if both the measurement values are outside the predetermined range. To remove the object to be inspected, and if necessary, install multiple couplers at one end of the connecting pipe, connect the couplers to each opening of the object to be inspected, It is characterized in that the inside of the inspection object is made substantially vacuum.

[0008]

[Embodiment of the invention]

 As shown in FIGS. 1 to 5, the leak inspection apparatus according to the present invention has a connection pipe 14, a pressure gauge 24, and a controller 26 disposed in a base frame 12, and the configuration thereof will be described below. It will be described in detail.

The connecting pipe 14 has a coupler 16 connected at one end to the opening J of the inspection object W, a vacuum pump 18 provided at the other end to make the inside of the inspection object W substantially vacuum, and an atmosphere between one end and the other end. This is a tube provided with an atmosphere release valve 20.

In the present embodiment, the coupler 16 is connected to one end of the connection pipe 14 via a flexible hose 22 so that the coupler 16 can be easily connected to the opening J of the inspection object W. The size of the opening J of the inspection object W is appropriately changed and used.

The vacuum pump 18 is only required to be capable of creating a substantially vacuum in the inspection object W in about several seconds (about 5 seconds), and has a performance of about 400 liters / minute. Desirable.

The pressure gauge 24 measures the pressure in the connection pipe 14 on the connection side with the inspection object W, and is connected between the coupler 16 of the connection pipe 14 and the atmosphere release valve 20. .

In the present embodiment, the inside of the pressure gauge 24 is separated into a vacuum chamber and an inspection chamber via a foil plate, the inspection chamber side is positioned on the connection side with the connection pipe 14, and the connection side with the inspection object W is connected. The pressure in the inspection object W is measured by the pressure difference between the pressure in the connecting pipe 14 and the pressure in the vacuum chamber.

The controller 26 drives and stops the vacuum pump 18, opens and closes the atmosphere release valve 20, displays the measured value of the pressure gauge 24, sets the measurement time interval, and sets the first and the measured values of the pressure gauge 24. When the difference between the second measurement values a and b is within a predetermined range, it is determined that there is no leakage, and when the difference is outside the predetermined range, it is determined that there is leakage.

In the figure, reference numeral 28 denotes an operation panel, 30 denotes a seal member, and 32 denotes an opening / closing valve.

A method for inspecting the leakage of the inspection object W using the leakage inspection device according to the present invention will be described below.

First, all openings other than one opening J of the inspection object W are hermetically sealed by the seal member 30 (first step).

In this example, since the inspection object W has two openings J, one of them is sealed with the seal member 30.

Next, the coupler 16 at one end of the connection pipe 14 is attached to one opening J of the inspection object W (second step).

At this time, since the coupler 16 is connected to one end of the connection pipe 14 via the flexible hose 22, the connection of the inspection object W to the opening J is extremely easy.

Next, the vacuum pump 18 at the other end of the connection pipe 14 is driven (about 5 seconds) to make the inside of the inspection object W substantially vacuum (third step).

Next, the vacuum pump 18 is stopped, and the pressure in the inspection object W is measured by the pressure gauge 24 immediately after the vacuum pump 18 is left to stand until the pressure in the inspection object W reaches a constant value (about 5 seconds). This measured value is referred to as a first measured value a (fourth step).

At this time, if the vacuum is not reached, a time T1 for reaching the vacuum is set in advance, and if the time T1 has not passed, the vacuum pump 18 continues to supply the vacuum. The vacuum is set, and when this time T1 has elapsed, it is determined that there is a leak, and the inspection is terminated.

In addition, the reason that the test object W is left until the pressure in the test object W becomes a constant value (that is, the test object W is left until the time T2 after the lapse of a predetermined time from the time T1) is set to a substantially vacuum even if the inside of the test object W is made substantially vacuum. Since the pressure is unstable due to the movement of the remaining particles, pressure fluctuations occur, and when the inspection object W is long, A pressure difference is generated between the coupler side and the seal member side, and by leaving it for a predetermined time (about 5 seconds), the pressure fluctuation due to the movement of the remaining particles or the pressure difference in the long inspection object W is eliminated. To stabilize the pressure.

Further, the pressure in the inspection object W immediately after a predetermined time (about 5 seconds) T3 has elapsed is measured by the pressure gauge 24, and this measured value is used as a second measured value (fifth step). .

At this time, if the predetermined time T3 has not elapsed, the pressure is measured after the predetermined time T3 has elapsed.

Next, if the difference between the two measured values a and b is within a predetermined range, it is determined that there is no leak, and if the difference between the two measured values a and b is outside the predetermined range, it is determined that there is a leak (sixth step). .

After the judgment is completed, the air release valve 20 is opened, the pressure in the inspection object W is set to the atmospheric pressure, the seal member 30 of one opening J of the inspection object W is removed, and the other of the inspection object W is removed. The inspection object W is removed from the apparatus by removing the coupler 16 having the opening J (step 7).

The third to sixth steps are all controlled by the controller 26.

As described above, the pressure in the inspection object W is set to be substantially vacuum, and the difference between the first measured value a of the pressure after standing for a predetermined time and the second measured value b of the pressure after further lapse of the predetermined time is determined. This makes it possible to easily inspect for leaks, greatly reducing the work load on workers.Also, even if the product capacity is large, it is possible to perform leak inspections, and also to check the product to be inspected after inspection. There is no work to remove water, and the work time can be shortened.

FIG. 6 shows another example.

In this embodiment, the opening J other than one opening J of the inspection object W is not hermetically sealed by the seal member 30, but a plurality of couplers 16 are attached to one end of the connection pipe 14, and the inspection is performed. Since the coupler 16 is attached to each opening J of the object W, and the inside of the inspection object W is made substantially vacuum at once from each opening J, and the time for making the substantially vacuum can be shortened, all are the same as the previous example. Description is omitted.

In both examples, the coupler 16 at one end of the connecting pipe 14 is connected via a flexible hose 22, but the inspected object W is manually or via a transport mechanism or the like. It is obvious that the flexible hose 22 can be omitted and the coupler 16 can be directly connected to one end of the connection pipe 14 by being conveyed to the vicinity, and used as it is.

Further, in both examples, it is obvious that the time for substantially vacuuming, the leaving time, the measuring time, and the like are variously set according to the capacity, the material, and the like of the inspection object W.

In both examples, the number of the openings J of the inspection object W is two, but may be one or three or more.

The performance of the vacuum pump 18 is not necessarily limited to both examples.

Further, in the first example, it is obvious that all the openings J except one of the inspection object W are automatically sealed via the sealing mechanism instead of the sealing member 30.

[0038]

[Effect of the invention]

 According to the leak inspection device of the present invention, a coupling pipe having a coupler at one end, a vacuum pump at the other end, and an atmosphere release valve between one end and the other end, a pressure gauge, and a vacuum pump are driven. Stop, open / close the air release valve, display the measured value of the pressure gauge, set the measurement time interval, and make sure that the difference between the first and second measured values measured by the pressure gauge is within the specified range without leakage. A controller that determines whether there is a leak and determines that there is a leak outside the predetermined range. After the inside of the test object is substantially evacuated, the pressure measurement value in the test object immediately after being left for a predetermined time is first measured. The measured value of the pressure in the test object immediately after the lapse of a predetermined time is used as the second measured value. If the difference between the two measured values is within the specified range, it is determined that there is no leakage. By judging that something outside the range is leaking, the leakage of the inspection Inspection allows for a very easy leak inspection, drastically reduces the work load on the workers, enables a leak inspection even when the product capacity is large, and removes moisture from the product to be inspected after the inspection. There is no work to remove, and the working time can be reduced.

Further, a plurality of couplers attached to one end of the connection pipe are attached to each opening of the inspection object, and the inside of the inspection object is made substantially vacuum from each opening at a time, thereby obtaining a substantially vacuum. And the inspection time can be shortened.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a leakage inspection device according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a flowchart showing an inspection process.

FIG. 5 is a graph showing the degree of vacuum and the time in the inspection step.

FIG. 6 is a schematic front view showing another example.

[Explanation of symbols]

 14 Connection pipe 16 Coupler 18 Vacuum pump 20 Atmospheric release valve 24 Pressure gauge 26 Controller 30 Seal member W Inspection object J Opening a First measured value b Second measured value T1 Elapsed time T2 Elapsed time T3 Elapsed time

Claims (2)

[Utility model registration claims] 1. A coupler (16) connected to an opening (J) of a test object (W) at one end, and a vacuum pump (18) for substantially vacuuming the test object (W) at the other end. And a connection pipe (14) provided with an atmosphere release valve (20) for taking in the atmosphere between the other end,
The pressure gauge (24) that measures the pressure in the connection pipe (14) on the connection side with the test object (W) and the vacuum pump (18) are driven and stopped, and the opening and closing of the atmosphere release valve (20) and the pressure The measured value of the gauge (24) is displayed, the measuring time interval is set, and the difference between the first and second measured values (a) and (b) measured by the pressure gauge (24) is within a predetermined range. A controller (26) that judges that there is no leak and judges that there is a leak outside of the specified range, and seals other openings (J) except one opening (J) of the inspection object (W). Then, the coupler (16) of the connecting pipe (14) is attached to one opening (J) of the inspection object (W), and the vacuum pump (18) at the other end of the connecting pipe (14).
Is driven to make the inside of the test object (W) substantially vacuum, and then the pressure in the test object (W) immediately after being left until the pressure in the test object (W) becomes a constant value is measured with a pressure gauge ( 24), this measured value is referred to as a first measured value (a), and the pressure in the test object (W) immediately after a lapse of a predetermined time is measured by a pressure gauge (24). 2 The measured value (b) is determined, and the controller (26) determines that there is no leak if the difference between the two measured values (a) and (b) is within a predetermined range, and determines both measured values (a) and (b) as predetermined. A leak inspection device characterized by determining that there is a leak outside the range, opening the air release valve (20) after the determination is completed, and removing the inspection object (W). 2. A plurality of couplers (16) are attached to one end of a connecting pipe (14), and a coupler (16) is connected to each opening (J) of the inspection object (W). Inspection object at once (W)
2. The leak inspection apparatus according to claim 1, wherein the inside is made substantially vacuum.