JP2023028193A - Moisture absorption respirator for oil-filled electrical device - Google Patents

Abstract

To provide a moisture absorption respirator of a small size and a simple configuration.SOLUTION: A breathing valve 14 includes a first intake/exhaust path 33 and a second intake/exhaust path 28, and a valve body 42 having an intake/exhaust hole 46 positioned between the first intake/exhaust path 33 and the second intake/exhaust path 28. In the valve body 42, a notch is made in the thin film to form an intake/exhaust hole 46, and the intake/exhaust hole 46 is formed by bending the surrounding portion of the notch along with intake/exhaust to inhale and exhale as desired.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to improvements in a hygroscopic respirator attached to an oil-filled electrical device such as a transformer to absorb moisture from the air flowing into the electrical device.

Oil-filled electrical equipment such as transformers are filled with oil (hereinafter referred to as insulating oil) for the purpose of securing insulation from the ground and conductors such as tanks housing the electrical equipment and cooling the electrical equipment. ing.

Insulating oil expands and contracts inside the tank due to changes in the temperature of the electrical equipment and outside air. It becomes necessary to move in and out (breathe) in between.

The respiration is performed through a tubular body that communicates the inside and the outside of the electrical equipment, but insulating oil deteriorates when it comes into contact with air containing moisture, and its electrical properties deteriorate. A respirator is installed to remove the moisture contained in the air that flows into the electrical equipment, thereby preventing the insulating oil from deteriorating due to contact with moisture in the air.

As the hygroscopic respirator, conventionally there are various structures, and for example, the one shown in Patent Document 1 below can be exemplified.

Actual Kaihei 5-18012

In Patent Document 1, as shown in FIG. 1 of Patent Document 1, it consists of a main body 1 and an upper lid 2, and a separator 12 is provided in the main body 1 to separate the suction channel and the exhaust channel, and the suction channel is made to absorb moisture. A hygroscopic respirator is shown in which a container containing a drug 4 is arranged, and valve bodies 30 and 40 are provided in an inhalation channel and an exhaust channel, respectively.

The valve bodies 30 and 40 provided in the intake channel and the exhaust channel of the hygroscopic respirator are closed in a normal state, and are opened alternatively with breathing of a power transformer or the like to which the hygroscopic respirator is attached. valve is used.

According to the hygroscopic respirator described in Patent Document 1, the insulating oil of a power transformer or the like expands and contracts with load fluctuations and changes in the outside temperature, and even if the volume change is repeated, the air above the insulating oil is Outside air can be breathed through the valve bodies 30 and 40 provided in the suction channel and the exhaust channel, respectively.

However, according to the above-mentioned hygroscopic respirator, the valve bodies must be arranged in both the suction flow path and the exhaust flow path. becomes more complex and product costs rise.

Therefore, in view of the above-mentioned problems, the present invention provides a moisture absorbing respirator of small size and simple construction.

The invention according to claim 1 comprises a substantially hollow cylindrical housing, a breathing tube attached to the upper part of the housing, and a breathing valve mounted to the lower hollow part of the housing, and the breathing valve comprises a second one intake path/exhaust path, a second intake path/exhaust path, disposed between the first intake path/exhaust path and the second intake path/exhaust path, and attached to the intake hole/exhaust hole The present invention relates to a hygroscopic respirator for oil-filled electrical equipment, characterized by comprising a valve body.

The invention according to claim 2 relates to a hygroscopic respirator for oil-filled electrical equipment, wherein the valve body according to claim 1 is constituted by a thin-film valve.

According to a third aspect of the invention, there is provided an oil-filled electrical apparatus comprising a filter between the second air intake/exhaust passage and the outside. of hygroscopic respirators.

According to the first aspect of the invention, since the breathing valve of the hygroscopic respirator is attached in the hollow part of the housing, it is not arranged side by side with the piping attached to the upper part of the housing, and the lateral dimension of the hygroscopic respirator is can be made smaller. In addition, since the intake path and the exhaust path, and the intake hole and the exhaust hole are shared, the structure is simplified and the hygroscopic respirator can be made compact.

According to the second aspect of the invention, by using a thin-film valve body, it is possible to easily construct a single valve body that alternatively performs intake and exhaust.

According to the third aspect of the invention, it is possible to reliably remove dust and dirt from the intake air.

Fig. 2 is a front view showing a state in which the hygroscopic respirator of the present invention is attached to oil-filled electrical equipment; 1 is a front view showing a hygroscopic respirator of the present invention; FIG. 1 is a side view showing a hygroscopic respirator of the present invention; FIG. Fig. 2 is a longitudinal cross-sectional view in front view showing the structure of a breathing valve that constitutes the hygroscopic respirator of the present invention; Fig. 2 is a longitudinal cross-sectional side view showing the structure of a breathing valve that constitutes the hygroscopic respirator of the present invention;

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. FIG. 1 shows an oil-filled electrical equipment A to which a hygroscopic respirator 1 of the present invention is attached. As shown in FIG. 1, the oil-filled electrical equipment A includes a tank 2 that houses an electrical equipment main body, a lid 3 that closes an upper opening of the tank 2, and an upward extension from the lid 3. It is roughly composed of a terminal for connecting electric wires for connecting the main body of the electrical equipment to the electric power system, and a bushing 4 made of a porcelain tube.

The tank 2 is filled with insulating oil for ensuring insulation from conductors such as the tank 2 and the ground, and for cooling the main body of the electrical equipment. The hygroscopic respirator 1 is attached to the oil-filled electrical equipment A through a breathing tube 5 .

FIG. 2 is an enlarged front view of the hygroscopic respirator 1, and FIG. 3 is a right side view. Reference numeral 6 shown in FIGS. 2 and 3 denotes a housing of the hygroscopic respirator 1, which is formed in a substantially hollow cylindrical shape. Reference numeral 7 denotes an upper flange of the housing 6, and 8 denotes a gas pipe attached to the upper flange 7 and communicating between the inside and outside of the housing 6. FIG.

A cap 9 is detachably attached to the upper opening of the gas pipe 8, and a cap 10 has a first flange 11 on the upper part and a connecting means 13 between a second flange 12 attached to the lower part of the breathing pipe 5. is the upper pipe connected by The lower part of the upper pipe 10 penetrates through the upper flange 7 and communicates with the inside of the housing 6 so as to allow ventilation.

14 shown in FIG. 2 is a breathing valve attached to the lower central part of the bottom part 15 installed in the lower hollow part of the housing 6. In the hollow part of the housing 6 above the bottom part 15, a moisture absorbent such as silica gel (not shown) is placed. is filled. 3, illustration of the breathing valve 14 is omitted.

A viewing window 16 is attached to the side surface of the housing 6 and has a transparent member 17 such as glass, so that the state of the moisture absorbent in the housing 6 can be checked.

Reference numeral 18 denotes a fixing metal fitting attached to the upper flange 7 by the first fixing means 19 shown in FIG.

Next, the structure of the breathing valve 14 will be described. FIG. 4 is a longitudinal sectional view showing the internal structure of the breathing valve 14. As shown in FIG. As described above, the breathing valve 14 is attached to the lower central portion of the bottom portion 15, and the bottom portion 15 has the first through hole 20 formed in its central portion.

A hollow valve fixing seat 23 having an upper flange 22 is arranged on the lower surface of the bottom portion 15 with an annular first gasket 21 interposed therebetween. Under the valve fixing seat 23, a valve lower part 25 is installed via a second circular gasket 24. The bottom part 15, the first gasket 21 and the valve fixing seat 23 are connected by second fixing means 26. The valve fixing seat 23 , the second gasket 24 and the valve lower portion 25 are connected by a third fixing means 27 .

A second air intake/exhaust passage 28 is formed through the lower valve portion 25 in the vertical direction, and 29 is a filter arranged under the lower valve portion 25. Together with a pressing plate 30 installed on the lower surface, It is connected to the lower valve portion 25 by a fourth fixing means 31 .

Reference numeral 32 denotes a support seat arranged on the upper surface of the valve fixing seat 23 in the first through hole 20 of the bottom portion 15 and the hollow portion of the first gasket 21, and the first intake passage/exhaust passage penetrates in the vertical direction. A path 33 is formed.

A filter 34 is installed on the support seat 32 so as to block the first intake/exhaust channel 33, and is fixed together with the support seat 32 by a fifth fixing means 36 via a retainer plate 35. It is attached to the seat 23 .

Reference numeral 37 denotes a partition wall that divides the hollow portion of the valve fixing seat 23 into a first space 38 and a second space 39, and is attached between the valve lower portion 25 and the support seat 32 via a third gasket 40. FIG. A second through hole 41 is formed in the central portion of the partition wall 37 . The first intake path/exhaust path 33 is provided on the first space 38 side, and the second intake path/exhaust path 28 is provided on the second space 39 side.

Reference numeral 42 denotes a thin-film-like valve element that abuts against the second space 39 side of the partition wall 37. A sixth through-hole 41 is closed via a pressing metal fitting 43 so as to close the second through-hole 41 of the partition wall 37. It is fixed by fixing means 44 .

FIG. 5 is a longitudinal sectional view of the breathing valve 14 shown in FIG. 4 as viewed from the right side. As shown in FIG. 5, the partition wall 37 is surrounded by a third gasket 40 and installed so as to completely block the hollow portion of the valve fixing seat 23 at its central portion.

A circular hole 45 having a diameter larger than that of the second through hole 41 of the partition wall 37 is formed in the center of the pressing metal fitting 43 . 42 are exposed.

In the central portion of the valve body 42, for example, an intake/exhaust hole 46 is formed by cutting in the vertical direction, and is normally closed. The intake/exhaust hole 46 does not have to be cut in the vertical direction, but may be cut in the horizontal direction, the diagonal direction, or a combination thereof.

The breathing valve 14 of the present invention constructed in this manner is fixed to the bottom portion 15 of the lower portion of the housing 6 of the moisture absorbing respirator 1, as shown in FIG. By removing the cap 9, the inside of the housing 6 is filled with a moisture absorbent through the upper opening of the gas pipe 8. , the filter 34 and the holding plate 35 close the upper opening, the absorbent does not fall into the hollow portion, and the absorbent does not fall on the bottom 15, the holding plate 35, or the valve fixing seat 23. Filled on top flange 22 .

Next, the breathing operation by the breathing valve 14 shown in FIGS. 4 and 5 will be explained. When the insulating oil in the tank 2 of the oil-filled electrical equipment A shown in FIG.

Since the breathing tube 5 is attached with the moisture-absorbing respirator 1, the moisture-absorbing respirator 1 operates to suck outside air through the breathing valve 14 shown in FIGS. The breathing valve 14 operates by sucking the air inside the housing 6 of the hygroscopic respirator 1 into the breathing tube 5 . Specifically, when the air in the housing 6 is drawn into the breathing tube 5, the air in the first space 38 inside the valve fixing seat 23 of the intake valve 14 shown in FIG. After passing through the intake path/exhaust path 33 , the air is sucked into the housing 6 through the first through hole 20 of the bottom portion 15 via the filter 34 .

The air sucked into the housing 6 is dehydrated by a dehumidifying agent (not shown) filled in the housing 6, passes through the upper pipe 10 shown in FIG. , is taken into the tank 2 of the oil-filled electrical equipment A shown in FIG.

As described above, when the air in the first space 38 of the valve fixing seat 23 is sucked, the air in the second space 39 passes through the intake/exhaust hole 46 of the valve body 42 shown in FIG. drawn into. At this time, the peripheral portion of the notch formed in the valve body 42 is warped toward the first space 38 due to the action of sucking air, thereby forming an air intake hole/exhaust hole 46, which causes the air in the second space 39 to move to the first space. 1 space 38. When the air sucking action from the second space 39 to the first space 38 is canceled, the valve body 42 is freed from warping around the notch, and the intake/exhaust hole 46 is closed.

When the air in the second space 39 passes into the first space 38 , outside air is taken into the second space 39 through the second air intake/exhaust passage 28 via the filter 29 . At this time, dust and dirt are removed from the air taken into the second space 39 by the filter 29 .

Through the above process, the oil-filled electrical equipment A shown in FIG. .

On the other hand, when the insulating oil in the tank 2 shown in FIG.

As shown in FIGS. 2 and 3, the moisture absorbing respirator 1 is attached to the breathing tube 5. The moisture absorbing respirator 1 absorbs the air discharged from the tank 2 into the breathing tube 5 as shown in FIGS. It operates to exhaust to the outside through the breathing valve 14 .

Breathing valve 14 operates when the air in housing 6 of hygroscopic respirator 1 is discharged into breathing tube 5 . Specifically, when the air in the housing 6 is discharged into the first through hole 20 of the bottom portion 15 of the breathing valve 14, the air passes through the filter 34 and exits the first intake/exhaust passage 33 from the valve. It is discharged into the first space 38 inside the fixed seat 23 .

The air discharged into the first space 38 passes through the second through hole 41 and the intake/exhaust hole 46 of the valve body 42 shown in FIG. 5, and is discharged to the second space 39 shown in FIG. be. At this time, the peripheral portion of the notch provided in the valve body 42 is warped toward the second space 39 due to the air discharge action, thereby forming an air intake/exhaust hole 46, which exhausts the air in the first space 38. It is allowed to pass through to the second space 39 .

When the air discharge action from the first space 38 to the second space 39 is canceled, the valve body 42 is freed from warping around the notch, and the intake/exhaust hole 46 is closed.

The air discharged to the second space 39 passes through the filter 29 from the second air intake/exhaust passage 28 formed in the valve lower portion 25 and is discharged to the outside.

In this manner, the oil-filled electrical equipment A shown in FIG. 1 discharges air from the breathing tube 5 to the outside through the moisture absorbing respirator 1 in accordance with the expansion of the insulating oil in the tank 2 .

As described above, the breathing valve 14 shown in FIGS. 4 and 5 performs air intake/extraction (breathing) between the tank 2 of the oil-filled electrical equipment A and the outside, following the expansion/contraction of the insulating oil in the tank 2. . The desiccant that has dehumidified the air through its respiration action determines when to replace the desiccant by checking its discoloration through the viewing window 17 shown in FIG.

As described above, in the hygroscopic respirator 1 provided with the breathing valve 14 shown in FIGS. Also, the upper pipe 10 and the breathing valve 14 are not arranged side by side, so that the hygroscopic respirator can be constructed compactly.

In addition, the breathing valve can be easily configured by adopting a structure in which a single valve body can alternatively perform intake and exhaust, and the intake path and the exhaust path are used in common. Furthermore, since the intake and exhaust holes are formed by cutting the thin-film valve body, the structure of the valve body can be simplified, the product cost can be suppressed, and the maintenance burden can be reduced.

It can be applied as a hygroscopic respirator for oil-filled electrical equipment.

REFERENCE SIGNS LIST 1 hygroscopic respirator 2 tank 3 lid 4 bushing 5 breathing pipe 6 housing 7 upper flange 8 gas pipe 9 cap 10 upper pipe 11 first flange 12 second flange 13 connecting means 14 breathing valve 15 bottom 16 viewing window 17 Transparent member 18 Fixing bracket 19 First fixing means 20 First through hole 21 First gasket 22 Upper flange 23 Valve fixing seat 24 Second gasket 25 Lower valve part 26 Second fixing means 27 Third fixing means 28 2nd intake path/exhaust path 29, 34 filter 30, 35 holding plate 31 fourth fixing means 32 support seat 33 first intake path/exhaust path 36 fifth fixing means 37 partition wall 38 first space 39 2 Space 40 Third Gasket 41 Second Through Hole 42 Valve Body 43 Pressing Metal 44 Sixth Fixing Means 45 Circular Hole 46 Suction Hole/Exhaust Hole A Oil Filled Electrical Device

Claims (3)

It consists of a substantially hollow cylindrical housing, a breathing tube attached to the upper part of the housing, and a breathing valve mounted to the lower hollow part of the housing, and the breathing valve serves as a first intake and exhaust path. , a second intake path/exhaust path, and a valve body disposed between the first intake path/exhaust path and the second intake path/exhaust path and attached to the intake hole/exhaust hole. Moisture absorption respirator for oil-filled electrical equipment. 2. A hygroscopic respirator for oil-filled electrical equipment according to claim 1, wherein said valve body is a thin film valve. 3. The hygroscopic respirator for oil-filled electrical equipment according to claim 1, wherein a filter is provided between said second intake/exhaust path and the outside.

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