JPH0712921Y2 - Water supply device for local water immersion flaw detection - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a water supply device for performing flaw detection on a welded portion of a subject by local water immersion, and in particular, a local amount of a required amount for the subject. The present invention relates to a water supply apparatus suitable for constantly injecting water for water immersion at the same time as the start of flaw detection to perform flaw detection.

[Conventional technology]

An example of a general water supply device in conventional local water immersion flaw detection will be described with reference to FIG. In the figure, 1 is a tank for water 1a used for local water immersion flaw detection, and 2 is a pump that sucks in and discharges water 1a, and conventionally a volute pump or the like among spiral pumps is used. Reference numeral 3 is a flow meter provided on the discharge side of the pump 2, and 4 is a solenoid valve provided on the downstream side of the flow meter 3.
The supply of water to the nozzle 5 that ejects the water is ON-OFF controlled in conjunction with the start of flaw detection. Reference numeral 6 is a valve provided on the conduit between the solenoid valve 4 and the nozzle 5, and a needle valve or the like has been used conventionally, and the discharge amount of the pump 2 is narrowed and the nozzle 5 is used.
The amount of water 1a jetted out is adjusted while observing the flow meter 3. Reference numeral 7 denotes a bypass line branched from a pipe line connecting the pump 2 and the flow meter 3, and surplus water of the water discharged from the pump 2 is returned to the tank 1. The bypass line 7 is provided with a valve 8 for adjusting the flow rate of surplus water.

[Problems to be solved by the device]

In the conventional water supply device having the above-mentioned configuration, the water discharged from the pump 2 is divided into water jetted from the nozzle 5 and water returned to the tank 1 via the bypass line 7. Depending on whether or not the valve 8 is properly adjusted, not only excess water but also water that should go to the nozzle 5 flows.
Therefore, even if the pump 2 is started, it takes time until the water 1a is jetted from the nozzle 5, and there is a problem that the flaw detection cannot be started until a certain time delay has elapsed after the pump 2 was started. Was.

Further, conventionally, since a volute pump or the like is used as the pump 2, the valve 6 for restricting the discharge amount of the pump 2 is required for adjusting the discharge flow rate of the nozzle 5. However, dust or the like in the water 1a tends to adhere to the needle portion of the valve 6,
As a result, it causes fluctuations in the flow rate, and the pump 2
Bubbles are likely to be generated on the discharge side of the and cause a decrease in flaw detection accuracy. Further, when other types of flaws of the subject having different sizes and shapes are to be flaw-detected, the ejection amount from the nozzle 5 needs to be adjusted for each type of the subject. The amount of ejection from the nozzle 5 is adjusted by adjusting the valve 6 for each time, which causes various problems such as not only the adjustment work is troublesome but also that the desired adjustment takes time.

In view of the above-mentioned problems of the prior art, the present invention provides a water supply device for local water immersion flaw detection, which is capable of performing a flaw detection by injecting a required amount of water onto a subject at the same time when the flaw detection is started. The purpose is to provide.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the water supply apparatus for local water immersion flaw detection of the present invention drives a pump to suck water in a tank, and the sucked water is interlocked with a flaw detection start via a solenoid valve by a nozzle. In a water supply device for a local water immersion test that ejects water on a subject, a pump that sucks in and discharges water in the tank is a positive displacement pump, collects water discharged from the pump, and discharges the accumulated water. An air chamber whose flow rate is maintained at a predetermined value by the internal pressure, a variable relief valve connected to the air chamber for adjusting the internal pressure of the air chamber, and water in the air chamber interlocked with the activation of the positive displacement pump. And a solenoid valve for ejecting from the nozzle.

[Action]

By configuring the present invention as described above, the water discharged from the positive displacement pump is temporarily stored in the air chamber, but the inside of the air chamber is kept at a constant pressure by the variable relief valve connected to the air chamber. Therefore, the discharge flow rate from the air chamber becomes a constant amount corresponding to the set pressure in the air chamber, and this constant amount is ejected from the nozzle via the solenoid valve. The ejection of water in the air chamber from this nozzle is performed by the solenoid valve in conjunction with the activation of the positive displacement pump, and the ejection amount from the nozzle is controlled by controlling the discharge amount of the positive displacement pump. The rough adjustment is performed, and further, the fine adjustment is appropriately performed by adjusting the set pressure of the variable relief valve. For this reason, it is possible to always eject a required amount of water from the nozzle to the subject at the same time as the flaw detection is started to perform flaw detection. In this case, whether or not the pressure inside the air chamber is kept at a desired pressure is constantly observed by a pressure gauge attached to the air chamber.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 2 indicate the same elements. In the figure, 9 is a positive displacement pump that sucks in water 1a in the tank 1 and discharges it. For example, by providing a diaphragm on the side surface of the casing and giving reciprocating motion to the diaphragm to increase or decrease the volume in the casing. A diaphragm pump or the like that exerts an evacuation action is used. Check valves 9a and 9b are provided upstream and downstream of the pump 9. 1
0 is an air chamber for storing water 1a discharged from the pump 9, 11 is a pressure gauge for displaying the pressure in the air chamber 10, and 12 is a pressure gauge.
Is a variable relief valve connected to the air chamber 10. The pressure in the air chamber 10 is maintained at a constant pressure set by the variable relief valve 12, and the internal pressure is displayed on the pressure gauge 11. Therefore, by changing the set pressure of the variable relief valve 12, the pressure in the air chamber 10 also changes correspondingly. Water discharged from the air chamber 10 to the nozzle 5
The water amount of 1a is a constant amount corresponding to the internal pressure of the air chamber 10, and when the internal pressure of the air chamber 10 is kept constant, the discharge flow rate is also constant and is constant. This air chamber 10
The discharge flow rate from the nozzle 5 is the same as the ejection amount from the nozzle 5, but since the ejection of the water 1a from the nozzle 5 is performed by the electromagnetic valve 4 in conjunction with the activation of the pump 9, a certain amount of water is ejected from the nozzle 5. At the same time as the flaw detection is started, it is always ejected to the subject under a constant condition.

In the flaw detection, first, the discharge rate of the pump 9 is roughly adjusted by setting the movement speed of the pump 9 according to the type of the subject, and then the variable relief valve 12 is adjusted while watching the pressure gauge 11. The pressure in the air chamber 10 is set. Air chamber
When the pressure in 10 is set, water 1a in the air chamber 10
Is discharged by the solenoid valve 4 in conjunction with the activation of the pump 9, and is directly ejected from the nozzle 5 through the flow meter 3 and the solenoid valve 4 to start flaw detection. Therefore, since the water 1a is ejected from the nozzle 5 at the same time when the solenoid valve 4 is activated and there is no time delay after starting the pump 9, the operation of the solenoid valve 4 can be linked with the signal for starting the scan of the subject. it can. On the other hand, the amount of water 1a ejected from the nozzle 5 is kept constant during flaw detection because the pressure inside the air chamber 10 is kept constant, and it is possible to perform flaw detection under constant conditions at the same time as the start of flaw detection. If the type of subject is different and the pressure in the air chamber 10 needs to be changed, it can be easily changed by adjusting the set pressure of the variable relief valve 12.

As can be seen from the above configuration, in the present invention, since the valve 6 in the prior art described in FIG. 2 is not used, problems such as flow rate fluctuations caused by the valve 6 and troublesome adjustment work are solved, In addition to the use of the positive displacement pump 9, the source of bubbles in the water 1a can be eliminated, and the accuracy of flaw detection can be improved.

[Effect of device]

INDUSTRIAL APPLICABILITY Since the present invention is configured as described above, there is an effect that at the time of the local water immersion flaw detection, a required amount of water is always jetted to the subject at the same time as the flaw detection is started.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a water supply device for local water flaw detection showing one embodiment of the present invention. FIG. 2 is an overall configuration diagram showing a general example of a conventional water supply device. 1 ... Tank, 1a ... Water, 3 ... Flowmeter, 4 ... Electromagnetic valve, 5 ... Nozzle, 9 ... Positive displacement pump, 10 ... Air chamber, 12 ... Variable relief valve.

Claims (1)

[Scope of utility model registration request] 1. A water supply apparatus for local water immersion flaw detection in which water is sucked from a tank by driving a pump, and the sucked water is jetted from a nozzle to a subject in association with the start of flaw detection via a solenoid valve, A pump for sucking and discharging the water in the tank is a positive-displacement pump, water discharged from the pump is stored, and the discharge flow rate of the stored water is kept at a predetermined value by an internal pressure, and A variable relief valve connected to the air chamber for adjusting the internal pressure of the air chamber; and a solenoid valve for ejecting water in the air chamber from the nozzle in association with activation of the positive displacement pump.
A water supply device for local water immersion flaw detection, comprising: