JPS6214033A - Water leak tester - Google Patents

Abstract

PURPOSE:To enable more accurate water leak test without any switching setup between low-pressure and high-pressure tests, by comparing reductions in the pressure between the low-and high-pressure tests to judge on the propriety of work. CONSTITUTION:First, first - third opening/closing valves 7, 8 and 10 and a stop valve 5 are opened with an opening/closing valve controlling circuit to circulate water in a tank 2 through a pipeline 4. Then, the stop valve 5 is closed and it is checked with a second manometer 25 that the pressure of water filling a boiler 6 reaches a test value to close the opening/closing valve 7. After the water pressure in the boiler 6 settles at the inspection pressure near the test value, the stabilized inspection pressure is memorized into a memory register. On the other hand, the actually measured water pressure of the boiler 6 detected with a manometer 15 is sent to a corresponding buffer register. Then, the inspection value of the memory register and the actually measured pressure of the buffer register are inputted into a comparator circuit to make a comparison between the difference therebetween and the upper and lower limit set values and a signal is outputted indicating the propriety of the boiler 6 from the comparator circuit. Thus, more accurate water leak test can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus that can perform two types of water leakage tests, low pressure and high pressure, on a workpiece.

(Prior art) Water heaters and other workpieces are often required to undergo two types of water leakage tests: low pressure and high pressure.
It is generally done in the order of low pressure and high pressure.

In the conventional low-pressure water leak test, as shown in Figure 4A, a first on-off valve (d) is inserted in the pipe line (C) that connects the pump (a) that pumps water and the workpiece (b). Then, a low pressure test pressure ut (e) is connected between the workpiece (b) and the first on-off valve (d) of the pipe line (C), and the workpiece (b) is first stopped. The water stop valve (f) of the formula and the first on-off valve (d) are opened, and the water in the tank (0) is pumped by the pump (a) into the strainer (Koh), a governor that regulates the pressure for low pressure tests. (i>,
The workpieces (b) are circulated in sequence. Next, the water stop valve (D) of the workpiece (b) is closed, and the pressure gauge (e) is used to check that the pressure of the water flowing into and filling the workpiece (b) reaches a predetermined low test pressure. After checking, the first on-off valve (d) is opened.Then, after a certain period of time, the pressure 11 (e
) is read with the naked eye, and based on the difference between that value and the test pressure, it is determined whether the workpiece (b) is good or bad, and the process ends.

In addition, the conventional high-pressure water leakage test is conducted on the workpiece (b) that was determined to be good in the low-pressure test, and after the low-pressure test is completed, the pressure gauge (e
), and as shown in Figure 4B, insert the second on-off valve (, l) between the first on-off valve (d) of the conduit (C) and the governor (i>).
A water pressure generator (k) for generating high pressure is connected between the first on-off valve (d) and the second on-off valve (O), and the workpiece (
A pressure gauge ω for high pressure testing is connected between the workpiece (b) and the first on-off valve (d), and the water stop valve (') of the workpiece (b) is first closed. With the second on-off valve (d) (j) open, water in the tank (IJ) is caused to flow into the workpiece (b) by the pump (a).

Next, the second shutoff valve O) is closed, and the water pressure generator (k
), and confirm with the pressure gauge that the pressure of the water filled in the workpiece (b) reaches a high predetermined test pressure. Immediately after confirmation, close the first on-off valve (d), read the value of the pressure gauge ω after a certain period of time, and determine whether the workpiece (b) is good or bad based on the difference between the value and the test pressure. and exit.

(Problems to be Solved by the Invention) In the conventional water leak test described above, when performing a high pressure test, the test equipment must be changed from a low pressure test to a high pressure test.
The work must be done in a time-consuming manner, and it is actually difficult to correctly adjust the pressure of the water filling the workpiece to the specified test pressure, resulting in inconveniences such as inaccurate measurements. Accompany.

(Means for Solving the Problems) In view of the above points, the present invention makes it possible to perform a high pressure test immediately without reassembling work between a low pressure test and a high pressure test. The purpose of the present invention is to provide a device that can conduct an accurate water leakage test by adjusting the pressure of filled water to a pressure in the vicinity of the predetermined test pressure, instead of adjusting it to a predetermined test pressure as in the conventional test. A first on-off valve and a second on-off valve on the upstream side thereof are interposed in a pipe line that connects a water heater or other work to a pump that pumps water. A water pressure generator is connected between the two on-off valves, and a first pressure gauge for high pressure and a water pressure generator for low pressure are connected between the workpiece of the pipeline and the first on-off valve. and a second pressure gauge are connected in parallel with each other, and the first, second, and third on-off valves are controlled to open υ, and the first, second, and third on-off valves are
・Actual a111if of the second pressure gauge! Load for a certain period of time,
It is characterized by being equipped with a judgment device that compares the pressure reduction value within the certain period of time with an internally set pressure reduction value during a low pressure test and a pressure reduction value during a high pressure test to determine whether the work is good or bad. shall be.

(Example) Next, the present invention will be explained based on illustrated embodiments.

In FIG. 1, (1) shows a circulation system in which water in a tank (2) is circulated through a pipe (4) by a pump (3), and the pipe (4) is connected to the pump (3). Workpieces in order of distance from the water stop valve (5) (=J lagoon water boiler (6), first on-off valve (7), second on-off valve (8), governor for regulating pressure for low pressure tests (9), strainer (IO is interposed.

The pipe line (4) is branched between the water heater (6) and the first on-off valve (7), and the first branch pipe av has a first pressure gauge a for high pressure at its tip. A third on-off valve ('l) is interposed in the middle of the second branch pipe (13), and a second pressure gauge a9 for low pressure is connected to the tip thereof.

Further, the pipe line (4) is branched between the first on-off valve (7) and the second on-off valve (8), and the third branch pipe (1G has a
A water pressure generator (171) for generating high pressure is connected to its tip.

As the water pressure generator (+7), a conventionally known type, for example, an air cylinder type is used.

('lF!j indicates a judger, and the judger 0a controls the opening/closing of the first, second, and third on-off valves (7) (8) ('lF! 311Vi is read and it is determined whether the water heater (6) is a good product or not in the low pressure and high pressure water leakage tests.

FIG. 2 shows the contents of the judgment device (1 & ”The aflog output from Henri 19 is connected to the correction circuit and 7'D.
The output signal is sent to the buffer register as a digital output via the converter and the buffer register.

29 indicates a memory register, and the memory register ■
stores the water pressure value Hs in the buffer register for a certain period of time when the hold signal is generated.

indicates a comparison circuit, and the comparison circuit QΦ calculates the difference between the water pressure ViMs in the memory register ■ and the water pressure value M at the end of a certain period of time in the memory register ■, which is sent to the buffer register ■. (Ms-M E ) with the internal upper and lower limit set values N1. Compared with N2, when the difference (Ms - Ms) falls within the upper and lower limit set values N1 and N2, a good product signal is output, and when it exceeds the upper limit set value N, a defective product signal is output, and the lower limit set value N2
If the value is less than 1, a test failure signal is output.

The symbol is the upper limit setter that sets the -F limit set value NIL for low pressure tests, ■ is the lower limit setter that sets the lower limit set value N2 for low pressure tests, and ■ is the upper limit set value NIH for high pressure tests. Upper limit setting device, ■ is lower limit setting value N2 for high pressure test
A lower limit setter sets M, and ■ indicates a set value switch for low pressure and high pressure, respectively.

In the figure, ■ is a display that momentarily displays the supply of the buffer register, ■ is a display that displays the value Ms of the memory register ■, and ■ is the first, second, and third on-off valve (7) ( 8)
(The opening/closing valve control circuits for opening/closing the opening/closing part of I are shown respectively.

(Function) Next, the operation will be explained with reference to Fig. 3. First, the first, second, and third on-off valves (7) (8) I'lΦ are opened by the on-off valve control circuit (■) in the determiner (■). At the same time, the water shut-off valve (5) of the first-stop water heater (6), which is the workpiece, is opened, and the pump (3) is operated to drain the water in the tank (2) into the pipe (2) for 5 to 6 seconds. 4). Then, close the water stop valve (5) and hold for 1.5 to 2 seconds until the pressure of the water filling the water heater (6) reaches a predetermined low test pressure. Then, the second pressure gauge 119 indicates that the test pressure has been reached.
When confirmed by the on-off valve υis circuit ■, the first
Turn the on-off valve (7) to the a1 valve and wait for 5 seconds until the water pressure in the water heater (6) drops to the test pressure near the test pressure.

After this 5 seconds has elapsed, a hold signal is immediately generated,
The stable test pressure MSL is stored in the memory register for a certain period of time, here 5 seconds.

While this test pressure MSL is being stored, the water pressure in the water heater (6) detected by the second pressure gauge ('lS) is sent to the 11 buffer register (2) at the time.

Then, at the end of the storage time of the memory register ■, J
3, the test pressure Ms of the memory register ■ and the actual measured pressure M of the buffer register ■ are input to the comparator circuit Q@, and the difference between the two (MSt-MEL) and the upper and lower limits of the low The set values Net and N2L are compared, and the comparison circuit C!
A good signal is output from Φ when N2L≦(MSL-MEL)≦Net, and (MS L-ME t ) >
When N or L, a defective product signal is output and (MSL-ME
L) <N2 When t, a test failure signal is output, and the low pressure water leak test of the water heater (6) is completed.

Immediately after the low-pressure test is completed, the high-pressure test starts. First, the first on-off valve (
7) Open the valve and open the second and third m valve (8) (lΦ
Close the valve. Next, create the water pressure generator surface! 71 to increase the water pressure in the water heater (6) and hold for 6 to 12 seconds until the pressure reaches the high predetermined test pressure.

When it is confirmed by the first pressure gauge ('lz) that the test pressure has been reached, the first on-off valve (7) is closed by the on-off valve control circuit (■), and the water pressure in the water heater (6) is Wait 5 seconds until the test pressure settles to a test pressure near the test pressure.

The subsequent test process is not particularly different from the low voltage test described above, and from the comparator circuit
-MEI-1)≦N1) When 1, a good product signal is output, when (Ms 11-M[H) >N+ u, a defective product signal is output, and when (MsuME)l)<N211, a test failure is detected. A signal is output, and the low pressure water leak test of the water heater (6) is completed.

(Effect of the invention) According to the present invention, the test device controls the opening and closing of the first, second, and third on-off valves, reads the values of the first and second pressure i, and maintains the values constant. Equipped with a decision device that determines whether the workpiece is good or bad when the value has settled down, it can be used immediately for both low-pressure tests and high-pressure tests. There is no need to change the configuration from low-pressure tests to high-pressure tests, which has the effect of improving test efficiency.

Furthermore, when performing a water leak test, the water pressure inside the workpiece does not need to be accurately adjusted to a predetermined test pressure as in the conventional system 2, but the test pressure settles to a test pressure in the vicinity of the predetermined test pressure. This has the effect of making it possible to perform accurate tests by confirming and chirping.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one example of implementation of the device of the present invention, and FIG.
The figure is a block diagram showing an example of implementation of the determiner of the device of the present invention, FIG. 3 is an explanatory diagram showing an example of the operation of the device of the present invention, and FIG.
The figure is an explanatory diagram of a conventional device.

Claims (1)

[Claims] A first on-off valve and a second on-off valve on the upstream side thereof are interposed in a pipe line that connects a water heater or other workpiece to a pump that pumps water, and the first and second on-off valves of the pipe line are provided with a first on-off valve and a second on-off valve on the upstream side thereof. A water pressure generator is connected in between, and a first pressure gauge for high pressure and a second pressure gauge for low pressure are connected between the workpiece of the pipeline and the first on-off valve. are connected in parallel with each other, and the first and second
・Control the opening and closing of the third on-off valve, read the actual measured values of the first and second pressure gauges for a certain period of time, and calculate the internally set pressure reduction value during the low pressure test and the high pressure test. 1. A water leakage testing device characterized by being provided with a determining device that determines whether the workpiece is good or bad by comparing it with a pressure reduction value at the time of the test.