JPS6258127A - Air leak tester - Google Patents

Abstract

PURPOSE:To obtain the titled tester reduced in cost and having high accuracy, by detecting the pressure of gas applied to an article to be inspected by a detector after a predetermined time is elapsed and operating an alarm apparatus on the basis of the detection value. CONSTITUTION:A pressurizing apparatus 3 has a pressure reducing valve 3a reducing the pressure of compressed air flowing in an inspection tube 2 from a pressure source 1 to predetermined pressure and a solenoid valve 3b opening and closing the inspection tube 2 in the downstream side of said valve 3a and performing the supply and stop of compressed air in the tube with respect to an article A to be inspected. A detector 4 detects the pressure in the inspection tube 2 positioned in the downstream side of the solenoid valve 3b, that is, the pressure in the article A to be inspected and has a contact 4a subjected to ON-operation when the detected pressure value reached predetermined pressure and a contact 4b subjected to ON-operation when reached the predetermined pressure or less. When the contact 4a took ON-operation, the solenoid valve 3b is closed and a timer is operated. During the OFF-operation of the contact 4b, a green lamp 5a lights and, when the contact 4b performs ON- operation, a red lamp lights and an alarm buzzer 5b emits sound.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air leak tester for testing the airtightness within a casing housing a sliding body, a rotating body, or the like.

(Conventional technology) As a conventional technique, there is a structure shown in FIG.

That is, a common pipe is connected to the compressed air source a, two branch pipes c-d are connected to the downstream end of this common pipe, and each branch pipe c-
The object to be inspected (A) and the reference object (B) are connected to the downstream end of d.

Then, from the upstream side to the downstream side of the common pipe, there is a pressure reducing valve e that reduces the pressure of compressed air from the compressed air source a to a predetermined value and supplies it to the common pipe, and detects the pressure inside the common pipe. and a first electromagnetic valve g for discharging the compressed air in each branch pipe c-d to the outside air after the inspection is completed.

Moreover, each branch pipe c-dtrll! on the upstream side of each branch pipe c-d mentioned above is connected to each branch pipe c-dtrll! The second and third solenoid valves h-j to close, and both branches immediately downstream of these valves. A differential pressure sensor k is provided to detect the pressure difference between C and d.

Then, each of the electromagnetic valves ghj is operated by a timer circuit as follows.

That is, the second. The third solenoid valve h-j is opened and the object to be inspected (
After compressed air is supplied to both A) and the reference object (B) to bring them both into the same pressure state, the second and third solenoid valves h-j are closed.

In this state, the differential pressure sensor k detects the pressure for a predetermined period of time.

If the pressure difference between the two branch pipes c and d is less than a predetermined value, a green lamp is lit, and if the pressure difference is greater than or equal to a predetermined value, a red lamp is lit and an alarm buzzer sounds. The structure was equipped with an alarm m.

(Problems to be solved by the invention) - The above conventional method connects the reference object (a) in parallel with the object to be inspected (a), detects the pressure difference between the two, and tests the quality of the object to be inspected. As a result, there were variations in the accuracy of the reference object (a).

Alternatively, if the accuracy of the reference object (a) deteriorates due to long-term use, not only will the inspection become inaccurate, but the structure will become complicated and expensive due to an increase in the number of parts.

The object of the present invention is to provide a new air leak tester that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides: - a pressurizing device that applies running pressurized gas to an object to be inspected; This configuration includes a detection device that detects pressure and a notification device that is activated by the detection device.

(Function) Since the present invention has the configuration described in item 1, a certain amount of gas that is pressurized to a predetermined value is applied to the object to be inspected by the pressurizing device.

Then, the pressure of the gas applied to the object to be inspected is detected by the detection device after a predetermined period of time, and the notification device is activated based on this detected value.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, in the drawings, FIG. 1 is a piping circuit diagram of an air leak tester showing an embodiment of the present invention, and FIG. 2 is a flowchart thereof.

First, in FIG. 1, reference numeral 1 denotes a pressure source in which air is compressed to, for example, 5 kg/d, and an inspection tube 2 is connected to this pressure source 1.

A hollow object A to be inspected, such as a cylinder or a flange housing, is removably connected to the downstream end of the inspection tube 2.

The test tube 2 is provided with a pressurizing device 3 on its upstream side and a detecting device 4 on its downstream side.

That is, the pressurizing device 3 includes a pressure reducing valve 3a that reduces the pressure of compressed air flowing into the test tube 2 from the pressure source 1 to 4 kg/cd, and a pressure reducing valve 3a that opens and closes the test tube 2 downstream of the pressure reducing valve 3a to perform the test. tube 2
A solenoid valve 3b that supplies and stops the compressed air inside the inspection object A.
It has the following.

Furthermore, the detection device 4 described in item 1 is composed of a pressure gauge with a contact point, and detects the pressure within the inspection pipe 2 located downstream of the solenoid valve 3b, and therefore within the inspected object A.
It has a contact 4a that is turned on when the pressure value reaches 2 kg/rffl and a contact 4b that is turned on when the pressure value becomes 2 kg/rffl or less.

When the contact 4a is turned on, the solenoid valve 3b
and a timer (not shown) is activated.

Reference numeral 5 denotes an alarm connected to the detection device 4, and this alarm 5 has a green lamp 5a for normal alarm, and a red lamp and buzzer 5b for abnormal alarm. When the detected value exceeds 2 kg1j and the contact 4b is turned off, the green lamp 5a lights up, and when the above detected value becomes 2 kg/or less and the contact 4b is turned on, the red lamp lights up and the alarm buzzer 5b is turned on. The circuit configuration is such that it makes a sound.

Note that 6 in the figure is a plug cylinder that closes the opening of the object A to be inspected.

Next, the flowchart shown in FIG. 2 will be explained.

First, the test object A and the test tube 2 are connected, and the plug cylinder 6 is operated to set the test object A in a sealed state.

In this state, when the start switch is turned on and started in step 10, the solenoid valve 3b opens in step 11, and compressed air reduced to 4 kg/ai by the pressure reducing valve 3a is discharged from the pressure source 1 side. It will flow towards the object A to be inspected.

Next, in step 12, it is checked whether the contact 4a of the detection device 4 is turned on, and if it is turned on, the process goes to step 13.
Step 1 proceeds to close the electromagnetic valve 3b, and at the same time, in step 14, a timer is activated.

As a result, a fixed amount of compressed air of 3 kg/d is applied into the inspection object A6.Next, in step 15, the above-mentioned application time T1 is set to 3 kg/d, for example.
Check whether it is maintained for 0 seconds.

When the above 30 seconds have elapsed, in step 16 the detection device 4
Check the OFF operation of the contact 4b, and if it is OFF, proceed to step 17 and turn on the green lamp 5a which indicates normal operation, and conversely, if the contact 4b is ON, Proceeding to step 18, a red lamp is turned on and an alarm buzzer 5b is sounded to notify an abnormality.

(Effects of the Invention) As is clear from the above description, according to the present invention, a certain amount of pressurized gas is applied to the object to be inspected for a predetermined period of time, and the pressure of the applied gas is detected after the elapse of this predetermined period of time. Since the system is configured to notify the user using a standard reference object, there is no need for a reference object, associated branch pipes, and a large number of solenoid valves.

Therefore, the present invention has the advantage of being able to reduce the number of parts, thereby reducing the cost, and to provide a highly accurate air leak tester.

[Brief explanation of the drawing]

FIG. 1 is a piping circuit diagram showing an embodiment of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is a piping circuit diagram showing a conventional example. 1: Pressure source, 2: Inspection tube, 3: Pressure device, 3a: Pressure reducing valve, 3b = Solenoid valve, 4: Detection device, 4a/4b: Contact, 5
: Alarm, 5a: Green lamp (normal notification), 5b: Red lamp and buzzer (abnormal notification). Application agent Hisato Matsumoto (] +'E+'J

Claims (1)

[Claims] 1. Equipped with a pressurizing device that applies a certain amount of pressurized gas to the object to be inspected, a detection device that detects the pressure of the applied gas after a predetermined period of time, and an alarm device that is activated by this detection device. An air leak tester characterized by: