JP2007333607A - Airtightness inspection device whose inspection object is box for attaching steam movement control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airtightness inspection device which has a simple structure and can surely keep the airtightness of its united part to a box, can surely find and specify a gas leaking spot of the box without applying stresses to the box and a sealing part, can reduce the amount of usage of helium gas especially, and can simply and surely detect the leaking spot in a short period of time even in a noisy environment, while keeping a dry environment without the use of water being a possible cause of occurrence of a stain and a leakage of electricity. <P>SOLUTION: The airtightness inspection device is employed for finding the leaking spot of the box, by attaching a main body section 2 into an attaching hole 91 for attaching a steam movement control device S, and supplying helium gas into a box K with a gas supply system 8 through an air hole 22 formed penetrating from the top end of this body section to the lower end, and the supply system is provided with an air bag 8a capable of expansion and contraction whose expansion limit is a pressure about 10 to 20 KPa, and a helium gas cylinder 8b to be united to this air bag detachably. <P>COPYRIGHT: (C)2008,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 present applicant has already proposed an airtight inspection device for confirming the airtight state of the box body to which the water vapor movement control device is attached (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.

  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 providing 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.

Conventionally, in the airtight inspection of the box body, it has been carried out by using soapy water or paste, etc. to find and identify the leaking part, but this method would damage the box body with soapy water, When applied to the box, there is a possibility of causing an electric leakage accident due to the use of water, and it is necessary to work carefully, and it is actually not preferable because it involves danger.
In addition, there is a method of finding the leak location by relying on the leak sound (sound of gas leaking), but it is extremely difficult to hear the leak sound in a noisy area, and this is not practical.

Conventionally, a helium gas detection device (helium gas detector) has been used to identify a leak location such as a refrigerant pipe of a power type electric air conditioner.
In the method using the helium gas detection device, helium gas is injected into the airtight space to check the pressure change in the airtight space, and the leak point where the pressure decreases is identified by the helium gas detection device.
However, this method places a heavy burden on the seal part of the box cover, putty, taping, simple squeeze packing, etc., in order to identify a slight leak point in a highly airtight space. There has been a problem that it is necessary to apply such a high pressure, for example, a pressure of about twice or more the atmospheric pressure.

Further, in outdoor work such as electric work, it is necessary to thoroughly reduce the cost of the airtightness test, and there is a problem that the use of expensive helium gas is economically restricted.
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. The airtight state is inspected while applying a certain pressure so that the airtightness is not applied, and not only the airtight state is inspected, but also the airtight leak point of the box body can be surely found and identified, In particular, the use of helium gas is minimized, and the detection of leak points is simple and quick in a dry environment without using water that causes contamination and leakage, and even in noisy environments. In addition, an object of the present invention is to provide an airtight inspection device that can be reliably performed.

In order to solve the above problems, an airtightness inspection apparatus of the present invention (Claim 1)
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;
An air supply device 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. The lower end of the presser link is brought into contact with the inner surface of the peripheral wall of the mounting hole inside the box by urging the pressing spring and the outer surface of the peripheral wall of the mounting hole is brought into contact with the annular packing. Formed to closely
The air supply device includes an expandable / contractible airbag having an expansion limit of a pressure of about 10 to 20 KPa (0.001 to 0.002 MPa), and a helium gas cylinder detachably connected to the airbag. The configuration.

The airtightness inspection device of the present invention (Claim 2)
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;
An air supply device 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. Formed to closely
The air supply device includes a double-ball manual pump in which a manual air pump is connected to an expandable / contractible airbag having a pressure of about 10 to 20 KPa as an expansion limit via a check valve, and a reverse to the manual air pump. It was set as the structure provided with the helium gas cylinder connected detachably through a stop valve.

The airtightness inspection device of the present invention (Claim 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,
A nut for screwing into a fitting portion from the inside of the box and attaching the main body to the box;
A vent hole formed inside the main body,
An air supply device connected to the vent hole,
The air supply device includes an expandable / contractible airbag having an expansion limit of a pressure of about 10 to 20 KPa (0.001 to 0.002 MPa), and a helium gas cylinder detachably connected to the airbag. It was.

The airtightness inspection device of the present invention (Claim 4)
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,
A nut for screwing into a fitting portion from the inside of the box and attaching the main body to the box;
A vent hole formed inside the main body,
An air supply device connected to the vent hole,
The air supply device includes a double-ball manual pump in which a manual air pump is connected to an expandable / contractible airbag having a pressure of about 10 to 20 KPa as an expansion limit via a check valve, and a reverse to the manual air pump. It was set as the structure provided with the helium gas cylinder connected detachably through a stop valve.

  The airtightness inspection apparatus according to the present invention (Claims 1 and 2) is attached using an attachment hole for attaching the water vapor movement control device.

  In the airtightness inspection apparatus according to claim 1 or 2, when the slide shaft is pushed up by the finger against the pressing spring and moved upward, the pressing link is reduced by the bias of the reducing spring while being guided by the expansion / contraction guide surface. To do.

  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.

  Further, in the airtightness inspection apparatus according to claim 3 or 4, the fitting part of the main body part is inserted from the outside into the mounting hole of the box body, and is screwed into the fitting part from the inside of the box body. Attach to.

After the airtightness inspection device is connected to the mounting hole as described above, helium gas is supplied into the box through the vent hole by the air supply device.
In this case, in the first or third aspect, the helium gas cylinder is detachably connected to the airbag, and helium gas is supplied and filled in the airbag.
Further, in the second or fourth aspect, the helium gas cylinder is detachably connected to the manual air pump, and helium gas is supplied and filled in the double-sphere manual pump.
Then, the helium gas detector (helium gas detector) is set in a place where gas leakage of the box to be inspected is assumed, and in that state, the airbag is gripped by hand, and the helium gas in the airbag is The inside of the box is fed through the ventilation hole to pressurize the inside of the box.
In this case, since the helium gas is ejected from the ventilation hole into the box body by grasping the air bag by hand, the inside of the box body is stirred by the helium gas, the dead space (dead space) is small, and the helium gas concentration is uneven. The inside of the box can be filled with helium gas in a state without any gas.

  After helium gas is supplied to the inside of the box body by the airbag as described above, helium is discharged outside the box body when the airbag is inflated under pressure or when the airbag is not inflated. If a gas detector is used to identify the leak location of the box, etc., and the helium gas detector detects helium gas, it is determined that there is a leak in the box, and the helium gas detector does not detect helium gas. It can be determined that there is no leakage in the box.

In this way, helium gas is supplied to the inside of the box body, and then the detection is performed by the helium gas detection device, so that the box body and the seal portion are easily and reliably sealed without stress. Can be inspected.
And since it is a method of detecting helium gas with a helium gas detection device, it is possible not only to inspect the hermetic state but also to find and identify a leaked portion.

  In particular, since the airbag has an expansion limit of a pressure of about 10 to 20 KPa, the pressure obtained by grasping the airbag does not exceed about 10 to 20 KPa. The detection operation of finding and identifying the leaked portion while reducing the burden on the target and avoiding the destruction of the seal portion or the like can be performed simply, in a short time, and reliably.

  Unlike conventional inspection methods that use soapy water, etc., inspection can be performed in a dry environment, so that the box will not be fouled, no electrical leakage will occur, and helium gas detection Since it is a method of detecting helium gas by an apparatus, it is not disturbed by noise, and a leak point can be found and specified reliably.

  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 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.

As shown in FIG. 3, the water vapor movement control device S has two small chambers R, R defined between the vent holes P, Q by the three film bodies M, M, M. , Q controls the movement of water vapor. 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.

The water vapor movement control device S of the embodiment includes a small chamber unit 10 and an outer cylinder 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.

Also, 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 an air bag 8 a as an air supply device 8 and helium are formed in the side hole 80. A gas cylinder 8b is detachably connected.
In this case, the connecting plug 81 is attached to the outer end of the side hole 80, the connecting socket 83 is attached to the tip of the air supply tube 82 extended from the airbag 8a, and the connecting plug 83 can be attached to and detached from the connecting socket 81 with one touch. It has become.
The airbag 8a is formed in an elliptical rubber sphere having a plurality of streaks formed in the longitudinal direction, and a net 84 is provided on the outer periphery thereof. By restricting the expansion of the airbag 8a by the net 84, The pressure is about 10 to 20 KPa so that the expansion limit can be achieved.

In this embodiment, a helium gas cylinder 8b or a manual air pump 8c using a rubber sphere is selectively detachably connected to the airbag 8a.
Therefore, an inspection method for connecting helium gas cylinder 8b to air bag 8a and supplying helium gas to box K, and an inspection method for connecting manual air pump 8c to air bag 8a and supplying air to box K are selected. can do.

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, in the closed state, the manual air pump 8c connected to the airbag 8a is operated, and it is confirmed that the measured value of the pressure gauge 7 shows a constant value for a certain time (for example, about 1 minute). Judge that there is no air leakage.
In the preliminary inspection of the airtightness inspection apparatus A itself, since air is supplied by the manual air pump 8c, the use of expensive helium gas can be saved and the economic burden can be reduced.
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 water vapor movement control device S is removed from the attachment hole 91 and the airtight inspection device A is attached to the attachment hole 91.

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.

After the airtightness inspection apparatus A is connected to the mounting hole 91 as described above, helium gas is supplied into the box body K through the vent hole 22 by the air supply apparatus 8.
In this case, the helium gas cylinder 8b is detachably connected to the airbag 8a, and helium gas is supplied and filled in the airbag 8a.

  At this time, if the air bag 8a does not inflate, if the gauge of the pressure gauge 7 does not rise, or if an apparently fast pressure drop can be confirmed, it is necessary to recognize that a leak has occurred and find the leak location There is.

  As an operation for discovering the leaked portion, a helium gas detection device (helium gas detector) (not shown) is set at a place where gas leakage of the box K to be inspected is assumed, and the airbag 8a is in that state. The helium gas in the airbag 8a is sent into the box K through the vent hole 22 of the main body 2 to pressurize the inside of the box K.

After the helium gas is supplied into the box K by the airbag 8a as described above, if the helium gas detection device detects the helium gas, it is determined that there is a leak in the box K, and the helium gas is detected. If the apparatus does not detect helium gas, it can be determined that there is no leakage in the box K.
In this way, helium gas is supplied to the inside of the box body K, and the subsequent detection by the helium gas detection device enables easy and reliable box body K without applying stress to the box body K or the seal portion. Can be inspected for airtightness.
Particularly, since the airbag 8a has a pressure of about 10 to 20 KPa as an expansion limit, the pressure obtained by gripping the airbag 8a does not exceed about 10 to 20 KPa, and a small amount of helium gas is used. Therefore, it is possible to find a simple and reliable leak point while avoiding the destruction of the seal portion or the like even in an environment where the noise is severe while reducing the economic burden.

In this embodiment, the helium gas cylinder 8b is not used, and the manual air pump 8c can be detachably connected to the airbag 8a.
In this case, when the manual air pump 8c is manually expanded and contracted, air is supplied to the inside of the box body K through the air supply tube 82, the side hole 80, the vent hole 22, and the upper end port 22b.
At this time, since the airbag 8a is used, it is possible to prevent excessive pressure from being applied to the inside of the box body K, and to check the airtight state while applying a certain pressure that does not apply stress to the box body K. can do.

Then, after supplying air to the inside of the box K, the pressure gauge 7 is looked at to determine whether or not there is air leakage in the box 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 air is supplied into the box K by the manual air pump 8c, and then the pressure gauge 7 is viewed, so that the box K can be easily and reliably applied without stress. The airtight state can be inspected.

  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 if water unexpectedly flows into the vent hole 22, the airtightness inspection device A is removed from the box K and the air supply device 8 is communicated. The socket 81 is removed, and the plug 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 an overall cross-sectional view showing a second embodiment of the airtightness inspection apparatus of the present invention.
This airtightness inspection device B is formed in a simple type, and a main body in which a fitting portion 27 is formed at the upper end portion to be inserted from the outside of the box body K into an attachment hole 91 for attaching the water vapor movement control device S. Portion 2, nut 28 for screwing into fitting portion 27 from the inside of box body K to attach main body portion 2 to box body K, vent hole 22 formed inside main body portion 2, vent hole 22 is connected to the air supply device 8.

  The air supply device 8 includes an expandable / contractible airbag 8a having a pressure of about 10 to 20 KPa as an expansion limit, and a helium gas cylinder 8b or a manual air pump 8c selectively detachably connected to the airbag 8a. And the inspection method using the helium gas cylinder 8b or the manual air pump 8c are the same as those in the first embodiment.

Next, FIG. 6 is an overall cross-sectional view showing a third embodiment of the airtightness inspection apparatus of the present invention.
This airtightness inspection device C is formed in a simple type like the second embodiment, and a fitting portion 27 for inserting the water vapor movement control device S from the outside of the box body K into the mounting hole 91 for mounting the water vapor movement control device S is provided. Formed inside the main body 2, the main body 2 formed at the upper end, a nut 28 that is screwed into the fitting portion 27 from the inside of the box K and attaches the main body 2 to the box K, and The ventilation hole 22 and the air supply device 8 connected to the ventilation hole 22 are provided.

In this airtightness inspection apparatus C, the flange 29 is formed at the upper end portion of the main body 2 to stabilize the state attached to the box K and the airtightness is improved by the double annular packing 30.
The pressure gauge 7 communicating with the vent hole 22 is different from the airtightness inspection apparatus B in that it is attached to the outer peripheral portion of the main body 2.

  The air supply device 8 includes an expandable / contractible airbag 8a having a pressure of about 10 to 20 KPa as an expansion limit, and a helium gas cylinder 8b or a manual air pump 8c selectively detachably connected to the airbag 8a. And the inspection method using the helium gas cylinder 8b or the manual air pump 8c are the same as those in the first embodiment.

Next, FIG. 7 is a whole sectional view showing a fourth embodiment of the airtightness inspection apparatus of the present invention.
This air tightness inspection apparatus D is an example in which another air supply apparatus is used as the air supply apparatus in the air tightness inspection apparatus of the first embodiment (shown in FIG. 3).
The air supply device 8 in this case includes a double-ball manual pump 8d in which a manual air pump 8c is connected to an expandable / contractible airbag 8a with a pressure of about 10 to 20 KPa as an expansion limit via a check valve 85; A helium gas cylinder 8b is detachably connected to the manual air pump 8c through a check valve 86.

In general, the airbag 8a is often marketed in the state of a double-ball manual pump 8d to which a manual air pump 8c is connected rather than being marketed alone. The ball manual pump 8d is used as it is, and the helium gas cylinder 8b is detachably connected to the manual air pump 8c in the double ball manual pump 8d.
In this way, since the two-ball manual pump 8d is used as it is, it is easy to purchase as a part, and it is not necessary to cut and separate the airbag 8a and the manual air pump 8c. The strength of the connecting portion between 8a and the manual air pump 8c can be maintained as it is.

  In use, the helium gas cylinder 8b is detachably connected to the manual air pump 8c, and helium gas is supplied and filled into the double-sphere manual pump 8d. In this state, a helium gas detector (helium gas detector) is installed. Set in a place where gas leakage of the box K to be inspected is assumed, and hold the dual ball manual pump 8d by hand in that state, helium gas passes through the vent hole 22 of the main body 2 and inside the box K. The operation of applying pressure and discovering and specifying the leakage location of the box K using the helium gas detection device outside the box K is the same as in the above-described embodiment.

In the double-ball manual pump 8d, a check valve 85 (one-way valve) is provided at the intake portion 87 (a connection portion between the airbag 8a and the manual air pump 8c) of the airbag 8a, and the manual air pump 8c. The intake portion 88 is provided with a check valve 86 (one-way valve), and the check valves 85 and 86 prevent helium gas from flowing backward, so that helium gas can be reliably sent in the direction of the box K. .
Further, an adapter 89 for connecting the helium gas cylinder 8b to the intake part of the manual air pump 8c is provided at the gas outlet of the helium gas cylinder 8b, and the helium gas cylinder 8b is simply and reliably connected by the adapter 89. Can be made.

  Further, the air supply device 8 using the double-ball manual pump 8d and the helium gas cylinder 8b shown in the fourth embodiment is not only the first embodiment but also the air supply device of the second and third embodiments. Of course, it can be used.

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 whole sectional drawing which shows 3rd Example of the airtight inspection apparatus of this invention. It is a whole sectional view showing the 4th example of the airtight inspection device of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Small chamber unit 11 Outer casing 12 Fitting part 13 Nut 2 Main part 20 Fitting part 21 Expansion / contraction guide surface 22 Vent hole 22a Vent gap 22b Upper end 23 Screw rod 24 Seat plate 25 Locking nut 26 Fixing spring 27 Fitting part 28 Nut 29 Flange 3 Flange 30 Ring packing 31 Screw hole 32 Seal ring 4 Slide shaft 4a Upper slide shaft 4b Lower slide shaft 4c Connecting nut 40 Pressing spring 41 Push button 42 Small diameter portion 43 Ground wire 44 Clip 5 Inserting head 5a Insulation cap 50 Presser link 51 Reduction spring 52 Expansion stopper 53 Reduction stopper 54 Seal ring 6 Sealing boot 6a Upper end 6b Lower end 6c Bellows 60 Plug member 61 Protector cylinder 62 Nut 7 Pressure gauge 70 Communication hole 8 Air supply 8a Air bag 8b Helium gas cylinder 8c Manual air pump 8d Double ball manual pump 80 Side hole 81 Connection plug 82 Air supply tube 83 Connection socket 84 Net body 85 Check valve 86 Check valve 87 Intake section 7
88 Air intake part 89 Adapter A Airtightness inspection device B Airtightness inspection device C Airtightness inspection device D Airtightness inspection device K Box body M Film body P Venting port Q Venting port R Small chamber S Water vapor movement control device L Horizontal line

Claims (4)

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;
An air supply device 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. Formed to closely
In addition, the air supply device includes an air bag that can be expanded and contracted with a pressure of about 10 to 20 KPa as an expansion limit, and a helium gas cylinder that is detachably connected to the air bag. 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;
An air supply device 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. Formed to closely
The air supply device includes a double-ball manual pump in which a manual air pump is connected to an expandable / contractible airbag having a pressure of about 10 to 20 KPa as an expansion limit via a check valve, and a reverse to the manual air pump. An airtight inspection apparatus comprising a helium gas cylinder detachably connected through a stop valve. 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,
A nut for screwing into a fitting portion from the inside of the box and attaching the main body to the box;
A vent hole formed inside the main body,
An air supply device connected to the vent hole,
An airtight inspection apparatus, wherein the air supply device includes an expandable / retractable airbag having a pressure of about 10 to 20 KPa as an expansion limit, and a helium gas cylinder detachably connected to the airbag. 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,
A nut for screwing into a fitting portion from the inside of the box and attaching the main body to the box;
A vent hole formed inside the main body,
An air supply device connected to the vent hole,
The air supply device includes a double-ball manual pump in which a manual air pump is connected to an expandable / contractible airbag having a pressure of about 10 to 20 KPa as an expansion limit via a check valve, and a reverse to the manual air pump. An airtight inspection apparatus comprising a helium gas cylinder detachably connected through a stop valve.

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