JP2007127434A - Airtightness inspection device using box for mounting steam movement control device as inspection object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airtightness inspection device having a simple structure, capable of keeping surely airtightness of a connection part to a box, and inspecting the airtight state, while applying a constant pressure not applying a stress to the box. <P>SOLUTION: An insertion head 5 is inserted into a mounting hole 91 formed on the box K and a fitting part 20 is fitted into the mounting hole in the state where a presser link 50 is reduced. The presser link is locked in the enlarged state by an enlarging stopper 52 in this state, and its lower end is allowed to abut on the inner surface of a peripheral wall part of the mounting hole, and the outer surface of the peripheral wall part of the mounting hole is brought into close contact with an annular packing 30. Then, the air is supplied into the box through an air hole 22 by expanding/reducing manually a two-continuous-sphere manual pump 8. When a measured value by a pressure gage 7 shows a constant value, it is determined that the air does not leak and airtightness is kept, and when the measured value by the pressure gage is lowered gradually, it is determined that the air leaks somewhere on the box and the airtightness is being lost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hermetic inspection apparatus that uses a special film body and a box for mounting a water vapor movement control device used as a humidity control device or the like by controlling the movement direction of water vapor by the arrangement thereof.

The present applicant has already proposed a water vapor movement control device (see Patent Document 1).
In addition, the applicant has already proposed an airtight inspection device for confirming the airtight state of the box attached with the water vapor movement control device (see Patent Document 2).

The water vapor movement control device is attached to a box, and one vent is communicated with the inside of the box, the other vent is opened to the atmosphere, and a plurality of small chambers are ventilated between the two vents. And is formed by a film body having heat and moisture permeability.
Then, using the air permeability and moisture permeability of each film body, the movement of water vapor is controlled so that the inside of the box body is conditioned by the outside air and the temperature fluctuation speed of the box body.
This water vapor movement control device functions on the premise that the box is kept airtight.

  In addition, the airtightness inspection device measures the exhaust pressure from the box while injecting a gas at a constant pressure from the air supply passage into the box, and compares the exhaust pressure with the injection pressure. When the injection pressure is almost equal to the injection pressure, the airtightness of the box body is maintained, and when the exhaust pressure is lower than the injection pressure, the apparatus recognizes that the airtightness of the box body is leaking.

However, the above-described airtightness inspection apparatus has a complicated structure such as providing a probe in which an air supply passage and an exhaust passage are formed by double pipes, or a gas injection device using an air dryer.
Further, since the connecting structure for connecting the probe to the box is merely an insertion, the structure becomes complicated and the cost of inspection is difficult.

In the airtightness inspection apparatus for a box, it is desirable to inspect by applying a certain pressure so as not to apply stress to the cover of the box or seals provided in each part.
JP-A-5-322060 WO99 / 66300

  The present invention has been made in order to solve the above-described conventional problems, has a simple structure, and can reliably maintain the hermetic connection of the connecting portion with the box, and can stress the box and the seal portion. Provides an air tightness inspection device that can detect airtight leakage of a box due to seal damage, etc., by checking the airtight state while applying a certain pressure that does not apply The challenge is to do.

In order to solve the above problems, the airtightness inspection device of the present invention is:
One vent is communicated with the inside of the box that is the object to be inspected, the other vent is opened to the atmosphere, and a plurality of small chambers are defined by a film body having air permeability and moisture permeability between the two vents. An airtight inspection device that is formed and has a box for attaching a water vapor movement control device for controlling the movement of water vapor between the two vents,
A main body portion formed at the upper end portion with a fitting portion to be inserted from the outside of the box into a mounting hole for mounting the water vapor movement control device,
An annular packing attached to the upper surface of the flange portion formed so as to protrude outward from the lower end of the fitting portion;
An expansion / contraction guide surface formed to protrude from the upper end surface of the main body,
A vent hole formed through the center of the expansion / contraction guide surface from the upper end to the lower end of the main body,
A slide shaft that is inserted through the ventilation hole so as to be vertically movable while holding a ventilation gap, and is normally urged downward by a pressing spring;
An insertion head attached to the upper end of the slide shaft and formed with a smaller diameter than the fitting portion;
At least three presser links disposed at equal intervals around the insertion head, the upper end of which is pivotally attached to the lower end of the insertion head;
A reduction spring provided between the presser links and biasing the inner surface of the presser link against the expansion / contraction guide surface;
A sealing boot provided between the lower end of the vent hole and the slide shaft;
A pressure gauge communicated with the vent;
An air supply device detachably connected to the vent hole,
In a state where the slide shaft is moved upward against the pressing spring, the presser link is formed to be reduced by the urging force of the reducing spring while moving upward along the expansion / contraction guide surface,
In a state where the slide shaft is moved downward by the bias of the pressing spring, the presser link expands against the reduction spring while moving downward along the expansion / contraction guide surface, and the expansion state is locked by the expansion stopper. Formed to
In a state where the presser link is reduced, the presser link and the insertion head are inserted into the mounting hole from the outside of the box, and the fitting portion is fitted into the mounting hole, and the presser link is expanded in this state. By locking and pressing the lower end of the presser link against the inner surface of the peripheral wall portion of the mounting hole inside the box by the biasing of the pressing spring, the outer surface of the peripheral wall portion of the mounting hole is attached to the annular packing. It is formed to be in close contact.

  In the airtightness inspection apparatus according to claim 1, there is an aspect in which the air supply device is a double-ball manual pump (Claim 2) or an electric air supply pump (Claim 3).

The airtightness inspection apparatus of this invention is attached using the attachment hole for attaching a water vapor movement control apparatus.
When the slide shaft is pushed up by the finger against the pressing spring and moved upward, the presser link is reduced by the bias of the reducing spring while being guided by the expansion / contraction guide surface.

  In this state, the presser link and the insertion head are inserted into the mounting hole from the outside of the box so that the fitting portion is fitted into the mounting hole, and then when the finger is released, it slides due to the bias of the pressing spring. The shaft moves downward, the presser link expands against the reduction spring while being guided by the expansion / contraction guide surface, and the expansion state is locked by the expansion stopper.

  Then, with the presser link locked in the expanded state, the lower end of the presser link comes into contact with the inner surface of the peripheral wall of the mounting hole inside the box by the urging of the pressing spring. The outer surface of the peripheral wall portion is closely attached to the annular packing attached to the upper surface of the flange portion, and airtightness can be maintained.

  In this way, with the slide shaft pushed up with a finger, the presser link and the insertion head are automatically inserted into the mounting hole from the outside of the box, and then the airtightness inspection device is automatically operated by simply releasing the finger. It can be connected to the mounting hole, and the airtightness of the connecting portion can be reliably ensured by the annular packing.

  After the airtightness inspection device is connected to the mounting hole as described above, air is supplied to the inside of the box through the vent hole by operating the air supply pump.

In this case, when a double-ball manual pump is used as the air supply pump (Claim 2), excessive pressure can be prevented from being applied to the inside of the box below the appropriate double-ball bulge limit, and the box is stressed. The airtight state can be inspected while applying a certain pressure so as not to apply.
In addition, even if the pressure gauge breaks down, the airtight inspection can be completed by the expansion and contraction of the double-ball manual pump after the air supply, and the measurement method is power-free and fail-safe.

  In addition, when an electric air supply pump (for example, a diaphragm pump, a tube pump, etc.) is used as the air supply pump (Claim 3), a large volume of air can be supplied in a short time, thereby shortening the measurement time. Is possible.

After supplying air to the inside of the box by the air pump as described above, the pressure gauge is used to judge whether there is air leakage in the box, and the measured value of the pressure gauge is If a constant value is indicated, there is no air leakage and airtightness is maintained, while if the pressure gauge reading does not increase or reaches zero within an amount of time shorter than the allowable time, It is determined that the airtightness within the proper range of the body and the container is not obtained.
In this way, air can be supplied to the inside of the box by an air supply pump, and then the pressure gauge can be viewed easily and reliably without applying stress to the box and the seal part. Can be inspected.

  FIG. 1 is an overall cross-sectional view showing a first embodiment of the airtightness inspection apparatus of the present invention, FIG. 2 is a cross-sectional view of a state in which a presser link provided in the airtightness inspection apparatus is reduced, and FIG. 3 is a connection place of the airtightness inspection apparatus. It is sectional drawing which shows the state which attached the water vapor | steam movement control apparatus to the attachment hole of the box.

The airtightness inspection apparatus A of the present embodiment is for inspecting the airtight state inside the box K to which the water vapor movement control device S (shown in FIG. 3) is attached, and for attaching the water vapor movement control device S. Are attached using attachment holes 91 formed in the bottom wall 90 of the box K.
As the box body K, for example, a power supply cubicle, a control box, a switch box, a distribution box, or a box body in which a space having a certain closed circuit is formed is assumed. ing.

In the water vapor movement control device S, two small chambers R, R are defined between the vent holes P, Q by the three film bodies M, M, M, and the water vapor moves between the vent holes P, Q. It is intended to control. The film bodies M, M, M may or may not be provided with conductive porous bodies.
In other words, it is used with one vent P opened to the outside air and the other vent Q connected to the inside of the box K. The film body M, M, M has the air permeability and permeability. By utilizing the humidity gradient, the movement of water vapor is controlled so as to adjust the inside of the box K according to the temperature fluctuation speed of the outside air and the box K.

As shown in FIG. 3, the steam movement control device S of the embodiment includes a small chamber unit 10 and an outer casing 11 in which the small chamber unit 10 is fitted.
In the small chamber unit, two small chambers R, R are formed inside by three film bodies M, M, M.
The small chamber unit 10 is fitted inside the outer cylinder casing 11, and the fitting portion 12 formed at the upper end portion of the outer cylinder casing 11 is attached to the attachment hole 91 formed in the bottom wall 90 of the box body K from the outside. The water vapor movement control device S is attached by fitting the nut 13 into the fitting portion 12 from the inside of the box body K.

  Next, the configuration of the airtightness inspection apparatus A will be described.

In the figure, reference numeral 2 denotes a main body portion, and a fitting portion 20 is formed at the upper end portion to be inserted from the outside of the box body K into a mounting hole 91 formed in the bottom wall 90 of the box body K.
The flange portion 3 is detachably attached by screwing so as to project outward from the lower end of the fitting portion 20, and the annular packings 30, 30 are attached so as to form a double circle on the upper surface of the flange portion 3. It has been.
A substantially hemispherical expansion / contraction guide surface 21 is formed so as to protrude from the upper end surface of the main body 2, and a vent hole 22 is formed through the center of the expansion / contraction guide surface 21 from the upper end to the lower end of the main body 2. Yes.

Three (or four) screw rods 23 are suspended from the lower surface of the main body 2, and a seat plate 24 is attached to the screw rods 23.
The lower surface of the seat plate 24 is supported by a nut 25 screwed onto the screw rod 23, and the seat plate 24 is fixed by mounting a fixing spring 26 between the lower surface of the main body 2 and the upper surface of the seat plate 24. It is supposed to be.
In this case, the position of the seat plate 24 can be moved up and down by moving the position of the nut 25 up and down.

A slide shaft 4 is inserted into the vent hole 22 so as to be vertically movable while holding a vent gap 22a.
The slide shaft 4 has an additional structure in which an upper slide shaft 4a and a lower slide shaft 4b are connected by a connection nut 4c. In this case, the upper slide shaft 4a and the lower slide shaft 4b are abutted in the connecting nut 4c to prevent loosening.
The upper slide shaft 4a extends upward from the center of the expansion / contraction guide surface 21, and an insertion head 5 is attached to the upper end thereof.
The lower slide shaft 4b extends downward from the lower surface of the main body 2 and then passes through the seat plate 24. A spherical push button 41 is attached to the lower end of the lower slide shaft 4b.
In this case, the push button 41 is locked to the lower end portion of the lower slide shaft 4b by the snap ring 45 so as to be idle.
When the push button 41 is pushed up with a finger, when the push button 41 is rotated, a lateral force is transmitted to the presser link 50 via the slide shaft 4, and the connecting portion and the presser link 50 are deformed or bent. In order to prevent this, the push button 41 is idled.
A pressing spring 40 is mounted between the lower surface of the seat plate 24 and the upper surface flange of the push button 41, and the slide shaft 4 is normally biased downward by the pressing spring 40.

The insertion head 5 has four (at least three) presser links 50 arranged radially at equal intervals around the insertion head 5. An insulating cap 5 a is attached to the upper part of the insertion head 5.
This insulation cap 5a performs insulation when abnormal contact is made with the electrical conduction portion inside the box.
The presser link 50 can be rotated and expanded between an enlarged state locked by the expansion stopper 52 (the state shown in FIG. 1) and a reduced state locked by the reduction stopper 53 (the state shown in FIG. 2). The upper end thereof is pivotally attached to the lower end of the insertion head 5, and a reduction spring 51 is provided between the presser links 50, 50, and the inner surface of the presser link 50 is made to the expansion / contraction guide surface 21 by the reduction spring 51. It is energized to press.
The insertion head 5 is formed to have an outer diameter that is substantially the same as the inner diameter of the mounting hole 91, and the mounting hole 91 is formed to have an appropriate inner diameter in view of the degree of fitting between the insertion head 5 and the mounting hole 91. It has a function as a gauge to judge whether or not.

A sealing boot 6 is provided between the lower end of the vent hole 22 and the lower slide shaft 4b.
The sealing boot 6 is an airtight member for preventing the air in the vent hole 22 from leaking outside through the thread of the lower slide shaft 4b, and the upper end 6a is screwed into the lower end of the vent hole 22. The lower end 6b is attached to the stopper member 60 in a sealing manner, and the lower end 6b is attached to the small-diameter portion 42 from which the screw thread of the lower slide shaft 4b is removed. It can be expanded and contracted accordingly.

Since the lower slide shaft 4b is slidably inserted into the plug member 60, the air in the vent hole 22 flows into the sealing boot 6 through the threads of the lower slide shaft 4b. .
If the sealing boot 6 expands due to the inflow of air into the sealing boot 6, the air pressure injected into the box body K will fluctuate, and accurate inspection cannot be performed.
Therefore, a protector cylinder 61 made of a transparent resin is attached to the lower surface of the main body 2, and the sealing boot 6 is fitted into the protector cylinder 61 to restrict the expansion in the circumferential direction. The slide shaft 4b is provided with a locking nut 62 for receiving the lower end of the sealing boot 6, thereby restricting the expansion in the axial direction and preventing fluctuations in the air pressure injected into the box body K during pressurization.

  A pressure gauge 7 is attached to the lower outer peripheral portion of the main body 2, and the pressure gauge 7 communicates with the vent hole 22 through a communication hole 70.

In addition, a side hole 80 is formed at a position having an angle of 90 degrees with the pressure gauge 7 in the lower outer peripheral portion of the main body 2, and a two-ball manual pump 8 as an air supply pump is formed in the side hole 80. Are detachably connected.
In this case, the connecting plug 81 is attached to the outer end of the side hole 80, and the connecting socket 83 is attached to the tip of the air supply tube 82 extended from the double ball manual pump 8, and the connecting plug 83 is attached to and detached from the connecting socket 81 with one touch. It can be done.
The double-pipe manual pump 8 includes a base end side sphere portion 8a and a tip end side sphere portion 8b, and air is sent out by manually expanding and contracting the base end side sphere portion 8a. Is prevented from rising above a certain pressure.

A ground wire 43 is connected to the lower end of the slide shaft 4, and a clip 44 is attached to the tip of the ground wire 43.
In addition, if the ground wire 43 is wound around an appropriate machine frame F or the like in work at a high place, it can be used as a fall prevention tool for the airtightness inspection apparatus A.

  Next, an inspection method by the airtight inspection apparatus A will be described.

First, before performing the airtight inspection of the box K, the air leakage of the airtight inspection device A itself is inspected.
In this case, since the slide shaft 4 is moved downward by the bias of the pressing spring 40, the lower end surface of the insertion head 5 provided at the upper end of the slide shaft 4 abuts on the upper end port 22 b of the vent hole 22 to close it. . At this time, the sealing ring 54 provided on the lower end surface of the insertion head 5 ensures airtightness.
Next, the double ball manual pump 8 is operated in the closed state, and it is confirmed that the measured value of the pressure gauge 7 shows a constant value for a certain period of time (for example, about 1 minute). Judge that there is no.
If air leaks, the nut 25 is moved upward to increase the effectiveness of the fixing spring 26, and the pressure contact force of the insertion head 5 (seal ring 54) against the upper end port 22b is increased. The end port 22b is closed.

  When the airtight inspection of the box K is performed by the airtight inspection device A, the airtight inspection device A is attached to the attachment hole 91 for attaching the water vapor movement control device S.

Normally, the slide shaft 4 is moved downward by the urging force of the pressing spring 40. In this state, when the slide shaft 4 is pushed up by the finger against the pressing spring 40 and moved upward, the presser link 50 is reduced by the urging force of the reduction spring 51 while sliding upward along the expansion / contraction guide surface 21.
In this case, the presser link 50 is locked in a substantially vertical state by the reduction stopper 53 so as not to further reduce.

  With the presser link 50 being reduced in this manner, the insertion head 5 and the presser link 50 are inserted from the outside of the box body K into the mounting hole 91 until the fitting portion 20 is fitted into the mounting hole 91.

At this time, when the thickness of the fitting portion 20 is constant, when the thickness of the bottom wall 90 of the box body K changes, the protruding amount of the fitting portion 20 protruding from the inner surface of the bottom wall 90 of the box body K changes. To do.
For example, when the thickness of the bottom wall 90 of the box body K is thick, the protruding amount of the fitting portion 20 protruding from the inner surface of the bottom wall 90 is low, and the fitting or pressing force between the fitting portion 20 and the mounting hole 91 is reduced. May become unstable.
Therefore, a plurality of types of flange portions 3 having different thicknesses are prepared, the flange portion 3 corresponding to the thickness of the bottom wall 90 of the box body K is selected, and the main body is inserted through the screw hole 31 formed in the center portion thereof. The unit 2 can be detachably attached. In this case, a seal ring 32 is mounted between the flange portion 3 and the main body portion 2 to ensure airtightness.

  Next, when the finger that has pushed up the slide shaft 4 is released, the slide shaft 4 is moved downward by the urging of the pressing spring 40, and the presser link 50 is moved downward along the expansion / contraction guide surface 21 for reduction. The spring 51 expands against the spring 51, and the expanded state is locked by the expansion stopper 52.

  Then, with the presser link 50 locked in the expanded state, the lower end of the presser link 50 comes into contact with the inner surface of the peripheral wall portion of the mounting hole 20 inside the box body K by the urging of the pressing spring 40. Thus, the outer surface of the peripheral wall portion of the mounting hole 20 is brought into close contact with the annular packing 30 attached to the upper surface of the flange portion 3, and airtightness can be maintained.

  In this way, with the slide shaft 4 pushed up with a finger, the presser link 50 and the insertion head 5 are automatically inserted into the mounting hole 91 from the outside of the box K, and then automatically released by simply releasing the finger. Further, the airtightness inspection apparatus A can be connected to the mounting hole 91, and the airtightness of the connecting portion can be reliably ensured by the urging force of the presser link 50 and the annular packing 30.

In addition, since the airtightness of a normal electric box is not high, the water vapor movement control device S recognizes the amount of leakage air allowed in the electric box or the like.
For example, as shown in FIG. 6, as the simple airtight inspection device C, a fitting portion 100 for inserting the attachment hole 91 from the outside of the box body K is formed at the upper end portion, and a ventilation hole 101 is formed therein. A connection plug 102 communicating with the vent hole 101 may be formed on the bottom surface.
In use, the fitting portion 100 is fitted into the mounting hole 91 from the outside of the box body K, and the nut 103 is screwed into the fitting portion 100 from the inside of the box body K so that the seal 104 keeps the airtightness. A simple airtight inspection device C is attached to the box K.
Then, an air supply tube 82 extended from the double ball manual pump 8 is connected to the connection plug 102, air is supplied into the box body K by the double ball manual pump 8, and the box body is viewed by looking at the pressure gauge 7. It is determined whether there is an air leak in K.
At this time, the tightening condition of the nut 103 changes depending on the personality and physical condition of the worker, and the tightness of the packing 104 to the outer surface of the bottom of the box body varies. As a result, the airtightness varies, and the inspection results also vary. The problem remains.
On the other hand, in the airtightness inspection apparatus A of the present invention, the pressing force to the outer surface of the box body by the packings 30 and 30 provided on the flange 3 is constant regardless of the operator.
Therefore, the variation as seen in the simple airtightness inspection apparatus C described above can be suppressed, the complexity of handling can be eliminated, and an appropriate inspection can be easily performed.
In addition, it is preferable to carry the said simple airtight inspection apparatus C simultaneously as a spare part of the airtight inspection apparatus A of this invention.

After connecting the airtightness inspection apparatus A to the mounting hole 91 as described above, when the double ball manual pump 8 is manually expanded and contracted, the box is passed through the air supply tube 82, the side hole 80, the vent hole 22, and the upper end port 22b. Air is supplied into the body K.
At this time, since the double ball manual pump 8 is used, it is possible to prevent excessive pressure from being applied to the inside of the box body K, and to apply airtight while applying a certain pressure that does not apply stress to the box body K. The condition can be checked.

Then, after air is supplied to the inside of the box body K by the double ball manual pump 8, the pressure gauge 7 is viewed to determine whether or not there is air leakage in the box body K.
At this time, when the measured value of the pressure gauge 7 shows a constant value, there is no air leakage and the airtightness is maintained, and when the measured value of the pressure gauge 7 gradually decreases, the box K It is judged that air leakage has occurred somewhere and the airtightness has been impaired.
In this way, the box body K can be supplied easily and surely without applying stress to the box body K by supplying air to the inside of the box body K by the double ball manual pump 8 and then looking at the pressure gauge 7. The airtight state of K can be inspected.
Moreover, even if the pressure gauge 7 breaks down, the airtight inspection can be completed by the expansion and contraction of the double-ball manual pump 8 after the air supply, and the measurement method is also fail-safe with no power supply.

  In the airtightness inspection apparatus A of this embodiment, when not in use, the seat plate 24 is moved downward to extend the fixing spring 26, and the pressing spring 40 is removed, so that the load of each member is increased. It is possible to reduce the deformation and deformation of each member such that the presser link 50 is reduced by the reduction spring 51.

Further, when the seal is broken due to an unexpected situation during the inspection, water may flow into the box K, and it is necessary to deal with this.
Therefore, if the height to the top surface of the expansion / contraction guide surface 21 is set high, it is possible to prevent water from flowing in from the upper end port 22b of the vent hole 22 opened in the center of the expansion / contraction guide surface 21.

  Further, if water flows into the vent hole 22, it is necessary to quickly remove it. In particular, if water enters the inside of the Breton tube provided inside the pressure gauge 7, the pointer of the pressure gauge 7 stops moving or the movement becomes inaccurate, making measurement impossible and continuing the inspection. You will not be able to.

Therefore, in this embodiment, as shown in FIG. 4, an air opening hole 27 communicating with the vent hole 22 is formed in the main body 2.
The air release hole 27 is normally closed by a plug 28, and when water unexpectedly flows into the vent hole 22, the airtightness inspection device A is removed from the box K and the double-ball manual pump 8 The communication socket 81 is removed, and the plug body 28 is removed to open the vent hole 22 to the atmosphere, so that the water is drained through the side hole 80.
In this case, the side hole 80 serving as a drainage channel is directed downward from the horizontal line L. At this time, the side hole 80 and the pressure hole 7 and the atmosphere opening hole 27 are directed upward from the horizontal line L. The positions of the pressure gauge 7 and the atmosphere opening hole 27 are set.

Next, FIG. 5 is a side view showing a second embodiment of the airtightness inspection apparatus of the present invention.
The airtightness inspection apparatus B in this case is a first embodiment in that an electric air supply pump 84 is used as an air supply apparatus, and this electric air supply pump 84 is incorporated in a casing 85 that can be attached to and detached from the main body 2. It is different from the example.

The electric air supply pump 84 is a diaphragm pump that alternately repeats intake and exhalation by extending and contracting by a cam 86a provided in the motor 86, and has a pressurization limit that suppresses a rise above a certain pressure, and is excessive. It is designed to prevent pressure from being applied.
The electric air supply pump 84 and the motor 86 are formed in a unit attached to the frame 84a, and the upper end portion of the frame 84a is attached via a vibration isolating rubber 84b. It is designed to prevent vibrations.
Further, a rubber tube or the like may be interposed between the connection plug 81 and the connection socket 83 in order to prevent vibration transmission from the electric air supply pump 84 into the airtightness inspection apparatus B.

  The electric air supply pump 84 can be driven by a microcomputer control system using a pulse wave. This method is characterized in that the adjustment of the rotation speed (rpm), the drive time amount, the modulation of rotation, etc. can be set, and the airtight inspection can be completed in a shorter time. Also, it is possible to store the inspection results in memory, which is convenient for maintenance of a large amount of equipment corresponding to a large amount of inspections.

  In FIG. 5, 87 is a battery power source, 88a is an ON / OFF switch, and 88b is an operation display lamp.

In use, the casing 85 is attached to the main body 2, and the connection socket 83 is connected to the connection plug 81 simultaneously with this attachment.
Then, the electric motor 96 is driven by the ON / OFF switch 88b to drive the electric air supply pump 84 (diaphragm pump), and air is supplied from the upper end port 22b to the inside of the box body K through the air supply passage 89 through the vent hole 22. Let
After the air is supplied to the inside of the box body K by the electric air supply pump 84 in this way, the pressure gauge 7 is used to determine whether or not the box body K has air leakage. It is the same as that of an Example.

  In the present invention, there is a method in which the slide shaft 4 is directly sealed with a seal ring instead of the sealing boot 6. However, in this case, precision is required and the assembly becomes expensive and difficult to assemble. Further, since oil is required for the seal portion, there is a risk that the pressure gauge 7, the air supply device (electric air supply pump 84) and the inside of the device may be contaminated with oil. In the present invention, there is no risk of such contamination. A sealing boot 6 that is inexpensive and easy to install is employed.

It is a whole sectional view showing the 1st example of the airtight inspection device of the present invention. It is sectional drawing of the state which reduced the presser link provided in the airtight inspection apparatus. It is sectional drawing which shows the state which attached the water vapor | steam movement control apparatus to the attachment hole of the box which is a connection place of an airtight inspection apparatus. It is sectional drawing of the main-body part provided in the airtight inspection apparatus. It is a side view which shows 2nd Example of the airtight inspection apparatus of this invention. It is sectional drawing which shows a simple airtight inspection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Small chamber unit 11 Outer cylinder casing 12 Fitting part 13 Nut 2 Main body part 20 Fitting part 21 Expansion / contraction guide surface 22 Vent hole 22a Vent gap 22b Upper end port 23 Screw rod 24 Seat plate 25 Locking nut 26 Fixing spring 3 Flange part 30 Annular packing 31 Screw hole 32 Seal ring 4 Slide shaft 4a Upper slide shaft 4b Lower slide shaft 4c Connection nut 40 Pressing spring 41 Push button 42 Small diameter portion 43 Ground wire 44 Clip 5 Insertion head 5a Insulation cap 50 Presser link 51 For reduction Spring 52 Expansion stopper 53 Reduction stopper 54 Seal ring 6 Sealing boot 6a Upper end 6b Lower end 6c Bellow part 60 Plug member 61 Protector body 62 Nut 7 Pressure gauge 70 Communication hole 8 Double ball manual pump 8a Base side ball 8b Tip Bulb 80 Wakiana 81 connecting the plug 82 the air supply tube 83 connecting the socket 84 the electric air pump 84a frame 84b rubber cushion 85 casing 86 motor 86a cam 87 battery power,
88a ON / OFF switch,
88b Operation indicator lamp 89 Air supply path 90 Bottom wall 91 Mounting hole A Airtightness inspection device B Airtightness inspection device K Box body M Film body P Venting port Q Venting port R Small room S Water vapor movement control device L Horizon F Machine frame C Simple airtightness inspection Device 100 Fitting part 101 Vent hole 102 Connection plug 103 Nut 104 Packing

Claims (3)

One vent is communicated with the inside of the box that is the object to be inspected, the other vent is opened to the atmosphere, and a plurality of small chambers are defined by a film body having air permeability and moisture permeability between the two vents. An airtight inspection device that is formed and has a box for attaching a water vapor movement control device for controlling the movement of water vapor between the two vents,
A main body portion formed at the upper end portion with a fitting portion to be inserted from the outside of the box into a mounting hole for mounting the water vapor movement control device,
An annular packing attached to the upper surface of the flange portion formed so as to protrude outward from the lower end of the fitting portion;
An expansion / contraction guide surface formed to protrude from the upper end surface of the main body,
A vent hole formed through the center of the expansion / contraction guide surface from the upper end to the lower end of the main body,
A slide shaft that is inserted through the ventilation hole so as to be vertically movable while holding a ventilation gap, and is normally urged downward by a pressing spring;
An insertion head attached to the upper end of the slide shaft and formed with a smaller diameter than the fitting portion;
At least three presser links disposed at equal intervals around the insertion head, the upper end of which is pivotally attached to the lower end of the insertion head;
A reduction spring provided between the presser links and biasing the inner surface of the presser link against the expansion / contraction guide surface;
A sealing boot provided between the lower end of the vent hole and the slide shaft;
A pressure gauge communicated with the vent;
An air supply device detachably connected to the vent hole,
In a state where the slide shaft is moved upward against the pressing spring, the presser link is formed to be reduced by the urging force of the reducing spring while moving upward along the expansion / contraction guide surface,
In a state where the slide shaft is moved downward by the bias of the pressing spring, the presser link expands against the reduction spring while moving downward along the expansion / contraction guide surface, and the expansion state is locked by the expansion stopper. Formed to
In a state where the presser link is reduced, the presser link and the insertion head are inserted into the mounting hole from the outside of the box, and the fitting portion is fitted into the mounting hole, and the presser link is expanded in this state. By locking and pressing the lower end of the presser link against the inner surface of the peripheral wall portion of the mounting hole inside the box by the biasing of the pressing spring, the outer surface of the peripheral wall portion of the mounting hole is attached to the annular packing. An air-tightness inspection device characterized by being formed so as to be in close contact with each other.   The airtight inspection device according to claim 1, wherein the air supply device is a double ball manual pump. The airtight inspection device according to claim 1, wherein the air supply device is an electric air supply pump.

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