JPH0318937Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reduced pressure heating tank, and in particular, in order to confirm the presence or absence of damage to wiring materials etc. in the manufacturing process of various electrical components used underwater, it is possible to use a reduced pressure heating tank by immersion in water under reduced pressure. By measuring the insulation resistance between the wiring materials of the various electrical components and water, it is possible to detect the presence or absence of any flaws that impede the degree of insulation, and then heat and dry again under reduced pressure to restore the original state. Regarding heating tanks.

Various electrical components that are inspected for damage during the assembly process using such a vacuum heating tank include components of underwater acoustic equipment such as various sonobuoys and acoustic sensors that are exposed underwater. There are coils, coiled windings, wire bundles, etc., and it is especially important to ensure insulation for these purposes, but during the manufacturing process, etc. If a scratch occurs, it will cause insulation failure between it and the seawater used, causing the entire device to lose its functionality.

Such flaws usually occur when part of the wire used for winding, etc., exposes the core conductor for some reason during the manufacturing process or from the beginning, and the size of the flaw is similar to that of a pinhole. They are generally small and therefore often extremely difficult to detect by visual inspection.

In addition, it is not uncommon for these winding wires, bundled wires, etc. to be covered with synthetic resin sleeves, etc. due to conditions such as being exposed underwater, or due to mounting and operational conditions. Inspection of injuries has become increasingly difficult.

For these reasons, the inspection for checking for scratches on various electrical components is usually carried out by immersing them in reduced pressure water as described below and then restoring them by heating and drying them under reduced pressure.

That is, an object to be inspected, such as a coil, to be inspected for the presence of flaws is placed in a container (tray) with one end open and filled with water, and the pressure is reduced in a vacuum chamber. The purpose of this pressure reduction is to eliminate air existing inside the windings, wire bundles, etc. of the object to be inspected, while allowing water to penetrate. In this way, the water almost completely penetrates into the inside of the winding, etc. of the object to be inspected, and if a flaw exists, the core conductor of the winding, etc. is almost short-circuited with the water through this flaw, creating an underwater immersion state. .

In this way, the purpose of the underwater immersion state obtained using reduced pressure is not only for the reasons mentioned above, but also for the reason that water permeates into the sleeve under atmospheric pressure. However, by using a reduced pressure state, it is possible to easily achieve almost complete immersion in water.

Incidentally, in such immersion in water, the end portions of the windings, etc., which should be avoided from immersion in water, are naturally treated in advance to maintain them in a watertight state.

FIG. 1 is a sectional view showing the structure of a reduced pressure tank that constitutes a conventional reduced pressure heating tank.

The conventional decompression tank shown in FIG. 1 includes a vacuum tank 1,
It is composed of a drying cylinder 2, a vacuum pump 3, and a tray 4.

The vacuum tank 1 and drying cylinder 2 are an intake pipe 10
1. The drying tube 2 and the vacuum pump 3 are the intake pipe 20
1, and the vacuum tank 1 is also connected to the vacuum pump 3 via an intake pipe 202 and an intake pipe 201. Kotsuku a,
By opening and closing b, the air inside the vacuum tank 1 is evacuated directly by the vacuum pump 3 through or without the drying cylinder 2.

A lid d having an airtight structure that can be opened and closed and forming a part of the vacuum tank 1 is opened, and a tray 4 having an open structure at one end is placed inside. Water 41 and an object to be inspected 42 are placed inside the tray 4, and the lid d is closed in this state.

If the object to be inspected 42 is a coiled electric wire covered with a sleeve, one end of the sleeve is left open, and the inside of the vacuum tank 1 is inspected by the vacuum pump 3 with the end of the sleeve left open and the end of the end of the sleeve closed, and the end of the end a opened. A predetermined vacuum state is created while discharging the air.

Inside the vacuum tank 1, where the air is gradually discharged and depressurized by the vacuum pump 3, air components contained in the water 41 and the test object 42 are gradually discharged, and the water 41 gradually enters the test object 42. As the water 41 begins to be immersed into the interior and the boiling point of the water 41 decreases, the release of water vapor from the water 41 also increases.

The degree of vacuum inside the vacuum tank 1 required to discharge air components from the object to be inspected 42 in this way is usually around 10 ³ to ^{10 4} Pa (Pascal), and for this purpose An oil rotary pump is generally used as a vacuum pump for this purpose. The vacuum pump 3 in FIG. 1 is also shown as an example of a rotary vane-shaped oil rotary pump that meets this purpose.

The drying cylinder 2 is intended to prevent as much as possible the gas having a high partial pressure of water vapor, which increases inside the vacuum tank 1 as air is discharged by the oil rotary pump 3, from being directly sucked into the vacuum pump 3. It has a sealed structure in which intake air is sent to the vacuum pump 3 via the moisture absorbing material 21.

After the air contained in the object to be inspected 42 has been discharged and the water 41 has sufficiently penetrated into the object to be inspected 42, the hole C of the open pipe 102 is opened, and the inside of the vacuum tank 1 is brought to atmospheric pressure. By measuring the insulation resistance between the core conductors such as the windings of the test object 41 and the test object 42, it was found that damage caused to the windings of the test object 42 caused the reduction in insulation resistance. The presence or absence of scratches etc. can be easily confirmed.

In this way, the presence of scratches or the like is confirmed, and if there is no abnormality, the water caused by immersing the test object 42 in reduced pressure water is completely dried.

FIG. 2 is a sectional view showing the structure of a heating tank constituting a conventional reduced pressure heating tank.

The conventional heating tank shown in FIG. 2 includes a heating tank 5 equipped with a heat insulating member 51 inside, a heater 6 using a heat generating member such as nichrome wire, a heat conducting member 7, a drying cylinder 2 and a vacuum pump 3. Prepared and configured. The heating tank 5 and the drying cylinder 2 are connected to the intake pipe 10
1. The drying tube 2 and the vacuum pump 3 are the intake pipe 20
1, respectively, and the heating tank 5 is also connected to the vacuum pump 3 via suction pipes 202, 201. The air inside the heating tank 5 is evacuated directly by the vacuum pump 3 through the drying cylinder 2 or not through the drying tube 2 by opening and closing the cylinders a and b.

The object to be inspected 42 after being immersed in water under reduced pressure is placed inside the heating tank by opening an airtight door (not shown).

In this state, the heater 6 generates heat while being supplied with external power, and heats the object to be inspected 42 to a predetermined temperature via the heat conductive member 7.

Along with this heating, the vacuum pump 3 is operated to discharge water vapor generated during heating, but since the inside of the heating tank 5 is depressurized by the vacuum pump 3, water 41 inside the object to be inspected 42 is removed. The boiling point of the water 41 decreases, the release of water vapor increases, and the water 41 is rapidly removed. Such reduced-pressure heating and drying is continued for a predetermined period of time to complete heating and drying of the inspection object 42.
The drying tube 2 is used in the same manner as the vacuum tank shown in FIG.

Note that the vacuum tank 1 does not contain water 41,
Alternatively, if oil is used instead of water 41 and the vacuum tank 1 is used for another purpose, or if the heating tank 5
When there is no risk of inhaling water vapor with a high partial pressure of water vapor due to depressurization or vapor due to organic substances, such as when the inspected object 42 is a dry product with very little moisture absorbed inside the vacuum pump 3. Since the problem of condensation due to these vapors does not occur in the compression process, the vacuum treatment can also be carried out without using the drying cylinder 2 by closing the chamber a and opening the chamber b.

However, the reduced pressure tank shown in FIG. 1 mentioned above,
The conventional reduced pressure heating tank constructed of the heating tank shown in FIG. 2 has the following drawbacks.

In other words, the decompression tank shown in FIG. 1 uses an ordinary vacuum tank almost as is, and therefore does not have water supply and drainage equipment. Therefore, whenever the shape of the object 42 to be inspected changes, the shape of the tray 4 must be adjusted accordingly. In addition, it is necessary to supply and drain water 41 each time, and the utilization rate of the internal space of the vacuum tank 1 is also limited.

In addition, the heating tank shown in Figure 2 is used for drying by heating under reduced pressure after the inspection. This means that it is necessary to replace the object to be inspected in the heating tank. Therefore, immersion in reduced pressure water and reduced pressure heating drying treatment are two-step operations, and two vacuum pumps or one vacuum pump are required. There is a drawback that switching usage is required, which increases processing time.

The purpose of this invention is to eliminate the above-mentioned drawbacks, to create an integrated structure of a decompression tank and a decompression heating tank that can be supplied and drained.
By providing a means to share the same vacuum chamber with water supply and drainage for both immersion in reduced pressure water and reduced pressure heating drying, trays are no longer required and space utilization within the vacuum chamber is significantly improved. Therefore, it is an object of the present invention to provide a vacuum heating tank that enables continuous processing of immersion in vacuum water and vacuum heating drying, thereby significantly reducing processing time and processing man-hours.

The decompression heating tank of the present invention uses an electrical wiring member wired to an electrical component exposed in water or as a single unit to be inspected, and ensures watertightness at both ends of the electrical wiring member to meet a predetermined condition. After leaving the tray in water under reduced pressure to almost completely immerse it in water, measure the insulation resistance between the core wire of the wiring member and the water in the tray under atmospheric pressure to determine whether there is a core wire exposure defect. A tray in which the object to be inspected is arranged in an inspection state is provided in a vacuum heating tank having a reduced pressure tank for carrying out inspection for confirmation, and a heating tank for dissipating moisture contained in the object to be inspected immersed in water by heating. a heat conductive member that acts on behalf of the outside to form a closed space that is capable of supplying and draining water for underwater immersion and that can be depressurized by intake of air from the outside, and that heats the closed space by receiving heat from the outside; a heater that heats from the outer periphery; a heat insulating member disposed around the outer periphery of the heater to thermally shield the heat generated by the heater; and a built-in heat conducting member, the heater and the heat insulating member, and a vacuum tank with a lid that brings a sealed space formed by a heat conductive member into a predetermined reduced pressure state; and a vacuum tank with an opening/closing mechanism that penetrates from the vacuum tank to the sealed space and forms a water supply channel from the outside to the sealed space. a water supply pipe, a drainage pipe with an opening/closing point that forms a drainage path penetrating from the sealed space to the outside of the vacuum tank, and an intake pipe that forms an intake pressure reduction path for the sealed space and has an open pipe for pressure release in the middle. The apparatus includes a pipe and a vacuum pump that brings the sealed space into a predetermined pressure-reduced state via the intake pipe, and has an integrated structure in which the pressure-reducing tank and the heating layer are made of the same layer.

Next, the present invention will be explained in detail with reference to the drawings.
FIG. 3 is a sectional view showing an embodiment of the present invention.

An embodiment of the present invention shown in the cross-sectional view of FIG. 3 includes a drying cylinder 2, a vacuum pump 3, a vacuum tank 8, a heater 9, a heat conductive member 10, a heat insulating member 11, a vacuum tank mounting frame 12, a vacuum pump It is comprised of a storage chamber 13 and a stirring fan 14.

The vacuum tank 8 constitutes a decompression tank together with the vacuum pump 3 and the drying tube 2, and includes a heat conduction member 10, a heater 9,
Heat insulating member 11 and vacuum pump housing chamber 13
A water supply pipe 801 for connecting to an external water supply source by penetrating the water supply pipe 801, a cap 15 for preventing the influence of water remaining in the water supply pipe 801 during vacuum drying, and a drainage pipe 802 for communicating with an external drainage channel. However, water 41 is supplied inside through a water supply pipe 801.
In addition to storing the water, the water 41 can also be drained through the drain pipe 802, and the inspected object 42
The vacuum tank 8 is installed by opening a lid 81 that can be freely opened and closed, which constitutes a part of the vacuum tank 8.

The vacuum tank 8 itself is made to have a structure strong enough to maintain a predetermined vacuum state, and is connected to a vacuum tank mounting frame 12.

A heater 9 using a heat generating member such as a nichrome wire is provided inside the vacuum tank 8 via a heat insulating member 11, and the heat generated by the heater 9 is transferred to the inside of the vacuum tank via a heat conductive member 10, and water 41 is drained. The object to be inspected 42 placed inside can be heated and dried.

Additionally, the air remaining inside the vacuum tank 8 becomes diluted as it is exhausted by the vacuum pump 3, and the heat distribution of the remaining air heated via the heater 9 and the heat conduction member 10 becomes uneven, and the object to be inspected becomes uneven. 42 will be unevenly dried.

To prevent this, the interior of the vacuum tank 8 is maintained at a constant degree of vacuum at which heat transfer can be expected not only by radiation but also by convection, using a vacuum controller (not shown), and at the same time, the stirring fan 14 is rotated. By stirring the remaining air, the temperature distribution of the internally heated air can be made uniform.

The water 41 is drained from the water supply pipe 801.
This can be easily carried out by closing the opening pipe 804, opening the opening g of the open pipe 804, and then opening the opening f of the drain pipe 802.

Now, the vacuum pump housing chamber 13 has the vacuum pump 3 and the drying tube 2 attached and housed therein, and the entire chamber is attached to the vacuum tank attachment frame 12.

The vacuum pump 3 and the drying cylinder 2 are connected by an intake pipe 201, and the drying cylinder 2 is connected to an intake pipe 80.
3 communicates with the inside of the vacuum tank 8.

Immersion in reduced pressure water using a reduced pressure heating tank having such a structure, subsequent insulation resistance measurement, and reduced pressure heating drying treatment are performed as follows.

First, after opening the lid 81 of the vacuum tank 8 and putting the object to be inspected 42 into the vacuum tank 8, the water supply pipe 801 is placed in the drain pipe 802 with the drain f closed and the drain e open. After supplying water 41 from an external water source, close the pot e and then close the lid 8.
1 in an airtight state and open the pipe 80.
Close 4 Kotoku g.

In this state, the vacuum pump housing chamber 13
By operating the vacuum pump 3 built into the vacuum tank 8, the air inside the vacuum tank 8 is sucked and the pressure is reduced to a predetermined vacuum state, and the air contained in the object to be inspected 42 is gradually degassed. As the temperature increases, water begins to penetrate into the interior, and after a predetermined period of time has passed while maintaining this state, the water 41 has almost completely penetrated into the inside of the winding, etc., and the object to be inspected 42 is almost completely submerged. It will be in an immersed state.

In such a submerged state, the operation of the vacuum pump 3 is stopped, the opening of the open pipe 804 is opened, the lid 81 of the vacuum tank 8 is opened, and the core of the coil, coiled wire, bundled wire, etc. of the object to be inspected 42 is removed. The insulation resistance between the end of the wire conductor and the water 41 is measured. The terminal portions of these core wire conductors are previously masked in a watertight state using a masking material or the like, and after opening the inside of the vacuum tank 8 to atmospheric pressure, this masking material is removed and the insulation resistance is measured.

In the case of this embodiment, the lid 81 can be easily opened and closed by using a hinge, a balance weight, etc. in combination.

After measuring the insulation resistance, heat and dry under reduced pressure to remove moisture and restore the product.

Drying by heating under reduced pressure is carried out as follows. After opening the drain f of the drain pipe 802 and draining the water 41 from the vacuum tank 8, the drain f and cap 15 are closed, the lid 81 is closed, and the drain g is closed. Note that the hole e of the water supply pipe 801 remains closed after the water supply is completed.

In this state, the vacuum pump 3 is operated again to discharge the air inside the vacuum tank 8, and the stirring fan 14 is operated to reduce the pressure to a predetermined degree of vacuum, while power is supplied to the heater 9. Make it heat up.

The heater 9 interposed between the heat insulating member 11 and the heat conducting member 10 is supplied with external power and generates heat,
The inspected object 42 is dried by heating the interior of the vacuum tank 8 after draining through the heat conduction member 10, and the water vapor component generated during this time is discharged by the operation of the vacuum pump 3. Also, by discharging the internal air under reduced pressure, the drying process is significantly accelerated.

The drying cylinder 2 removes water vapor components and the like contained in the air inside the vacuum chamber discharged during the above-mentioned immersion treatment in reduced pressure water and the reduced pressure heating drying process via a moisture absorbent.

After heating and drying under reduced pressure, the operation of the vacuum pump 3 is stopped, the tank g is opened to release the inside of the vacuum chamber to atmospheric pressure, and then the lid 81 is opened and the test object 42 is taken out.

In this way, it is possible to continuously perform immersion in reduced pressure water and drying by heating under reduced pressure using a reduced pressure heating tank that integrates a vacuum tank that can easily supply and drain water, and a heating structure that uses this vacuum tank as a heating tank. can.

Although the basic embodiment has been described above as one embodiment of the present invention, it is clear that the present invention can be applied to other modified examples as well. For example, in the embodiment shown in FIG. 3, the vacuum tank 8 is attached to the vacuum tank mounting frame 12 and used, but instead, only the vacuum tank 8 is used and the vacuum pump housing chamber 13 is attached externally to it. It is clear that there is no problem at all, and the opening method of the lid 81 of the vacuum chamber may be changed to any other opening/closing method that can maintain airtightness, such as the so-called bayonet opening/closing method.

Furthermore, although the vacuum pump 3 uses an oil rotary pump, it is clear that it can be replaced with another vacuum pump having substantially the same function as the oil rotary pump.

Furthermore, in this embodiment, a stirring fan is used as shown in FIG. There is no problem even if you do not use .

Furthermore, it is also possible to use only one of the immersion in reduced pressure water and the reduced pressure heating and drying treatment performed in the reduced pressure heating tank shown in Figure 3. It is clear that restoration by heating and drying under reduced pressure, or impregnating electrical parts such as coils with insulating oil, can be easily carried out by using insulating oil instead of water in the immersion treatment in reduced-pressure water.
All of the above can be easily implemented without detracting from the spirit of the present invention.

As explained above, according to the present invention, in a vacuum heating tank that performs immersion in reduced pressure water and heating and drying under reduced pressure, there is a vacuum tank for reducing pressure that can be supplied and drained, and a heating structure that shares this vacuum tank as a heating tank when draining water and in a reduced pressure state. By configuring them as an integrated structure, it is possible to perform continuous treatment of immersion in reduced pressure water and heating and drying under reduced pressure, and it is also possible to carry out the depressurization in these two processes in one vacuum chamber.
Furthermore, there is an advantage that a dedicated tray for storing the object to be inspected together with water is not required, and a reduced pressure heating tank can be realized which can constantly reduce the pressure using only one vacuum pump.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of a decompression tank constituting a conventional decompression heating tank, Fig. 2 is a cross-sectional view showing the structure of a heating tank constituting a conventional decompression heating tank, and Fig. 3 is a depressurization according to the present invention. It is a sectional view showing the structure of a heating tank. 1, 8... Vacuum tank, 2... Drying cylinder, 3...
Vacuum pump, 4... tray, 5... heating tank,
6, 9... Heater, 7, 10... Heat conductive member, 1
1, 51...Insulation member, 12...Vacuum tank mounting frame, 13...Vacuum pump housing chamber, 14...
Stirring fan, 15... Cap, 21...
Hygroscopic agent, 41... Water, 42... Test object, 10
1,201,202,803...Intake pipe, 1
02,804...Open pipe, 801...Water supply pipe, 802...Drainage pipe.

Claims (1)

[Scope of utility model registration request] The object to be inspected is an electrical wiring member that is wired to an electrical component that is used while being exposed to water, or is a single electrical wiring member, and the electrical wiring member is placed in water in a tray under a predetermined reduced pressure while ensuring watertightness at both ends of the electrical wiring member. After that, the insulation resistance between the core wire of the wiring member and the water in the tray is measured under atmospheric pressure, and an inspection is performed to confirm the presence or absence of a core wire exposure defect. In a vacuum heating tank having a tank and a heating tank for dissipating moisture contained in the test object immersed in water by heating, a tray on which the test object is placed in the test state is substituted and the test object is immersed in the water between it and the outside. A heat conductive member that forms a closed space that can supply and drain water for immersion and that can be depressurized by intake air from the outside, and that heats the closed space by receiving heat from the outside; a heater that heats the heat conductive member from the outer periphery; A heat insulating member disposed around the outer periphery of the heater to thermally shield heat generated by the heater, a heat conductive member, the heater, and the heat insulating member built in, and formed by the heat conductive member by intake of air from the outside. a vacuum tank with a lid that brings a sealed space into a predetermined reduced pressure state; a water supply pipe with an opening and closing mechanism that penetrates from the vacuum tank to the sealed space and forms a water supply channel from the outside to the sealed space; A drainage pipe with an opening/closing mechanism that forms a drainage path penetrating to the outside of the vacuum tank, an intake pipe that forms an intake pressure reduction path for the sealed space and has an open pipe for pressure release in the middle, and and a vacuum pump for bringing the closed space into a predetermined reduced pressure state, the reduced pressure heating tank having an integrated structure in which the reduced pressure tank and the heating layer use the same tank.