JP7321362B2 - Check valve flapper device and switchgear - Google Patents

Description

The present application relates to a check valve flapper device and a switch gear provided with the check valve flapper device.

In the switchgear, in order to suppress the temperature rise of the equipment and the current-carrying circuit mounted inside, ventilation holes are provided on the top of the switchgear and on the front and back of the switchgear to release the air inside the panel to the outside of the switchgear. need to dissipate heat. On the other hand, if high-temperature, high-pressure gas is generated inside the switchgear due to a short-circuit accident (internal arc accident), the high-temperature, high-pressure gas may be released outside the switchgear from this ventilation opening, affecting the area around the switchgear. . Therefore, in conventional switchgears, a flapper is attached to the ventilation opening on the front or back of the switchgear where people may work, and it is always kept open, and in the event of a short circuit accident, it is closed by the gas pressure generated inside. A valve flapper is attached (see, for example, Patent Documents 1 and 2).

An arc shielding damper device, which is a check valve flapper disclosed in Patent Document 1, is rotatably operated by a hinge attached to the top of a damper plate. The flanges on both sides of the damper plate and the bracket of the housing are fixed with bolts at the top, and the bolt channels of the flanges and the wheel bearing channels of the bracket are slidably attached with bolts through the bearing wheels at the bottom. ing. Normally for ventilation, the bearing wheels of the wheel bearing channels are seated in the notches so that the damper plate is in a position with a certain angle towards the housing. When high temperature, high pressure gas is generated in the housing, the damper plate is pushed toward the housing, the bearing wheel of the wheel bearing channel moves over the notch, and the biasing spring pushes the damper plate against the housing face to close. The pressing force of the biasing spring can suppress the rebound of the damper plate due to the pressure of the high-pressure gas. A damper handle is provided outside the damper plate to return the damper plate to the open position.

When high-temperature, high-pressure gas is generated in the housing, the damper plate receives pressure in the closing direction, and at the same time, the high-temperature, high-pressure gas may be discharged to the outside from the side of the damper plate. When the high-temperature, high-pressure gas is discharged to the outside, the pressure that pushes the damper plate in the closing direction decreases, and there is a risk that the damper plate will not smoothly close.

In contrast, U.S. Pat. No. 6,200,401 discloses a device that acts to retain the arc shield when it is in the open position and, in the event of hot, high pressure gas generation, prevents the flow of hot, high pressure gas from contacting the ventilating assembly. A deployed arc shield side retainer plate is disclosed.

International Publication No. 2012/161778 (Fig.4A-Fig.6B) US Patent Application Publication No. 2019/045644 (Fig.1, Fig.4)

In the structure of Patent Document 2, a lock mechanism and a biasing spring are used to suppress the arc shield from rebounding due to the pressure of the high-pressure gas. However, once the arc shield is in the closed position, it is not easy to return to the open position from the outside because the arc shield is pressed by the biasing spring. Moreover, in Patent Document 1, it is necessary to provide a damper handle on the outside.

The present application discloses a technique for solving the above problems, and suppresses the rebound of the flapper part with a simple structure, and a non-return mechanism that can be moved to the open position without using a special jig. An object of the present invention is to provide a valve flapper device and a switchgear using this check valve flapper device.

A check valve flapper device according to the present disclosure includes a frame body, a flapper part whose upper part is rotatably fastened to the frame body, a lower part having an L-shaped bent part, and the flapper part which is bent at a predetermined angle. and a flapper side frame covering both sides between the flapper held at the predetermined angle and the frame; and a flapper side frame provided on the frame. and a latch portion engaged with the L-shaped bent portion and capable of releasing the engagement by a release lever provided at a position facing the flapper portion.

The switchgear according to the present disclosure includes, inside a housing, a circuit breaker chamber housing a circuit breaker, a bus bar housing housing a bus bar , a cable chamber housing a cable, and the above-described and a check valve flapper device.

According to the present disclosure, a check valve flapper device capable of suppressing rebound of the flapper with a simple structure and moving to the open position without using a special jig, and a switch using this check valve flapper device Gear can be provided.

2 is a side view showing the configuration of the switchgear according to Embodiment 1; FIG. FIG. 2 is a view showing the structure of the check valve flapper device according to Embodiment 1, viewed from the direction of the arrow X in FIG. 1. FIG. FIG. 3B is a perspective view showing the structure of the check valve flapper device according to Embodiment 1, and FIG. 3B is a perspective view and an enlarged view of the latch portion as seen from the direction of arrow Y in FIG. 3A. FIG. 3 is a cross-sectional view showing the structure of the check valve flapper device according to Embodiment 1, and is a cross-sectional view along the AA direction in FIG. FIG. 3 is a cross-sectional view showing the structure of the check valve flapper device according to Embodiment 1, and is a cross-sectional view along the AA direction in FIG. 2 when the flapper portion is closed. FIG. 5 is a diagram for explaining the closing operation of the flapper portion of the check valve flapper device according to the first embodiment; FIG. 5 is a diagram for explaining an operation of moving a closed flapper portion to an open position in the check valve flapper device according to Embodiment 1; FIG. 8 is a side view showing the configuration of a switchgear according to Embodiment 2; FIG. 9B is a perspective view showing the structure of the check valve flapper device according to Embodiment 2, and FIG. 9B is a perspective view seen from the direction of arrow Z in FIG. 9A.

The present embodiment will be described below with reference to the drawings. In addition, in each figure, the same code|symbol shall show the same or a corresponding part.

Embodiment 1.
A check valve flapper device and a switchgear provided with the check valve flapper device according to Embodiment 1 will be described below with reference to the drawings.
FIG. 1 is a right side view showing an example of the structure of the switchgear according to Embodiment 1. FIG. In the figure, the switchgear 1 is divided into a plurality of compartments in a housing 10, a circuit breaker room 20 containing a circuit breaker 21, a bus line room 30 containing a bus line 31, a current transformer (CT: Current Transformer), transformer (VT: Voltage Transformer), lightning arrester (SAR: Surge Arrester), zero-phase current transformer (ZCT: Zero-phase Current Transformer), etc. It has a compartment 50 and a front cable compartment 40 located in front of the rear cable compartment. The ventilation openings 13 provided in the ceilings of the bus room 30 and the rear cable room 50 act to suppress the temperature rise in the room. The breaker room 20 may be equipped with a mobile transformer.

A check valve flapper device (hereinafter referred to as “flapper device”) 100 is attached to the panel portion of the housing 10 . In FIG. 1, the flapper device 100 is provided on the front door 11 of the circuit breaker chamber 20, the inside of the front door 11 of the front cable chamber 40, and the upper rear cover 12a and lower rear cover 12b of the rear cable chamber 50. . The flapper device 100 is normally used as a ventilation port, and functions as a check valve to prevent gas from flowing out of the housing 10 when an internal arc occurs. Therefore, if space permits, it is desirable to arrange a plurality of them as shown in FIG. It is desirable to provide a flapper device 100 on the rear lower cover 12b of the cable chamber 50. As shown in FIG.

Next, the structure of the flapper device 100 will be described. FIG. 2 is a view showing an example of the structure of the flapper device 100, and is a view of the flapper device 100 provided on the lower rear cover 12b of the rear cable chamber 50 in FIG. 1 as viewed from the arrow X direction. In the figure, the flapper device 100 includes a frame 102 for attachment corresponding to the ventilation opening of the rear lower cover 12b, a hinge 103 for rotatably attaching the flapper 101 to the frame 102, and the side of the flapper 101. It is provided with flapper side frames 104a and 104b provided with flapper holding portions for holding the cover flapper plate in the open position. Flapper side frames 104 a and 104 b are also attached to frame 102 .

3 is a perspective view showing the structure of the flapper device 100, and FIG. 3B is a perspective view seen from the Y direction in FIG. 3A. 3B is an enlarged view of the latch portion 106. As shown in FIG. It should be noted that the Y direction in the drawing indicates that the housing 10 is viewed from the outside.
In the figure, the flapper part 101 has a shallow housing structure, a flapper surface 101a that receives gas pressure when high temperature and high pressure gas is generated, and a flapper surface 101a that is provided at the upper end of the flapper surface 101a and extends in the direction opposite to the direction of receiving the gas pressure. A flapper upper portion 101b attached to the hinge portion 103 and attached to the hinge portion 103, and a flapper surface 101a extending in a direction opposite to the direction of receiving the gas pressure and engaged with the latch portion 106 by an L-shaped bent portion. and flapper side portions 101d and 101e extending in the direction opposite to the direction of receiving the gas pressure on both sides of the flapper surface 101a. However, the flapper side portion 101d is not shown in FIG.

The flapper side frames 104a and 104b extend from the fan-shaped frame surfaces 104a1 and 104b1 and the frame surfaces 104a1 and 104b1 that cover the sides between the flapper portion 101 and the frame body 102, respectively, and extend toward the flapper surface 101a. It has bent flanges 104a2 and 104b2.
The frame surfaces 104a1 and 104b1 of the flapper side frames 104a and 104b are arranged so that the flapper side portions 101d and 101e of the flapper portion 101 cover the space of the side portions where the flapper side portions 101d and 101e move from the open position shown in FIG. 3 to the closed position. , 101e. Further, when the flapper portion 101 is at the open position, the flapper portion 101 is held at a predetermined angle by the flapper holding portion 105, for example, at an angle of about 20° from the closed position. When the flapper portion 101 is in the open position, it is desirable that the flapper surface 101a and the inner surfaces of the flanges 104a2 and 104b2 of the flapper side frames 104a and 104b contact each other.
The frame body 102 is provided with an inner frame 102a so as to protrude toward the inside of the housing 10, that is, toward the flapper section 101 side, and a latch section 106 is attached to the lower center.

4 and 5 are cross-sectional views showing the structure of the flapper device, taken along line AA in FIG. 4 shows a state in which the flapper portion 101 is in the open position, and FIG. 4B shows a state in which the flange 104a2 of the flapper side frame 104a is superimposed on FIG. 4A. FIG. 5 shows the state of the closed position in which the flapper portion 101 has moved toward the frame body 102 and is closed, and FIG. 5B shows the state in which the flange 104a2 of the flapper side frame 104a is superimposed on FIG. 5A.
The flapper holding portion 105 is, for example, a detachable fastener such as a ball catch. The flapper holding portion 105 is composed of a ball portion 105b, which is a male portion of the fastener, and a catch portion 105a, which is a female portion. The ball portion 105b is attached to the flange 104a2 of the flapper side frame 104a, and the catch portion 105a is attached to the flapper side portion 101d of the flapper portion 101. As shown in FIG. When the flapper portion 101 is at the open position, the ball portion 105b and the catch portion 105a are fitted to hold the flapper portion 101 at the open position. The ball catch is detachable and needs only to have a holding force capable of holding the flapper portion 101 trying to close due to its own weight. It is easily operable.

When the flapper portion 101 moves from the open position to the closed position, the flapper side portion 101d of the flapper portion 101 moves along the flange 104a2 of the flapper side frame 104a. At the closed position, the flapper section 101 is locked by the latch section 106 so that the flapper section 101 surrounds the inner frame 102a as a housing.

Next, the structure of the latch section 106 and the movement operation of the flapper section 101 will be described.
FIG. 6 is a diagram for explaining the operation of closing the flapper section 101 of the flapper device, and FIG. 7 is a diagram for explaining the operation of moving the closed flapper section 101 to the open position. It corresponds to a cross-sectional view seen from the direction.
6A1, 6B1, 6C1, and 6D1 show how the flapper portion 101 is closed in that order, and FIGS. 6A2, 6B2, 6C2, and 6D2 are enlarged views of the corresponding latch portion 106. showing.
First, the structure of the latch section 106 will be described with reference to FIG. 6A2. The latch portion 106 is attached to the lower portion of the inner frame 102a, and has a latch 106a projecting from the lower portion, a groove portion 106b between the latch 106a and the frame body 102 side, and a release lever 106c.

Next, the operation of moving the flapper portion 101 from the open position to the closed position will be described. 6A1 and 6A2, the flapper portion 101 is held by the flapper holding portion 105. FIG. When gas pressure is applied to the flapper surface 101a due to arc generation in this state, the flapper holding portion 105 is disengaged, and the flapper portion 101 begins to move around the flapper upper portion 101b. At this time, the flapper side frames 104a and 104b located on both sides of the flapper portion 101 prevent the gas from flowing out.
6B1 and 6B2, when the flapper portion 101 approaches the inner frame 102a, the tip of the L-shaped bent portion of the flapper lower portion 101c abuts the latch 106a, and the latch portion 106 begins to rise, as shown in FIGS. 6C1 and 6C2. to the position shown in .
As shown in FIGS. 6D1 and 6D2, when the tip of the L-shaped bent portion of the flapper lower portion 101c enters the groove portion 106b, the latch portion 106 descends as indicated by the arrow, and the tip of the flapper lower portion 101c moves toward the latch portion 106. , the flapper portion 101 stops and prevents rebounding.

When the gas pressure due to arc generation is high, even if the flapper portion 101 is engaged with the latch portion 106 at one end, rebound may occur. Since there is nothing to restrain the flapper part 101 other than the hinge part 103 even if the rebound occurs, the flapper part 101 returns to the direction of the latch part 106 by its own weight and is engaged. Further, even if the flapper holding portion 105 re-engages due to rebound, the holding force of the flapper holding portion 105 is not large as described above, so the flapper portion 101 immediately rotates in the direction of the closed position due to the force of rebound and its own weight. do.

Next, the operation of moving the closed flapper portion 101 from the closed position to the open position will be described. 7A1, 7B1, 7C1, and 7D1 show how the flapper portion 101 is moved to the open position in that order, and FIGS. 7A2, 7B2, 7C2, and 7D2 are enlarged views of the corresponding latch portion 106. Figure shows.
7A1 and 7A2, the tip of the L-shaped bent portion of the flapper lower portion 101c of the flapper portion 101 is engaged with the latch portion 106, and the flapper portion 101 is in the closed position. At this time, the release lever 106c of the latch portion 106 is pulled up from the outside of the housing as indicated by an arrow. Since the release lever 106c is provided on the side facing the flapper portion 101, that is, on the outside of the housing 10, it is easy to operate.
In FIGS. 7B1 and 7B2, since the latch portion 106 is pulled up, the tip of the L-shaped bent portion of the flapper lower portion 101c engaged with the groove portion 106b can come out from the groove portion 106b. At this time, as indicated by the dashed arrow, the flapper portion 101 is pushed toward the inside of the housing from the outside of the housing. Further operation of the release lever 106c is unnecessary once the tip of the flapper lower portion 101c is out of the groove portion 106b.
As shown in FIGS. 7C1 and 7C2, when the flapper section 101 is pushed into the housing, the lower flapper section 101c slides over the latch 106a and the flapper section 101 advances toward the open position.
7D1 and 7D2, the flapper portion 101 is pushed until it is fitted into the flapper holding portion 105, and the flapper portion 101 is held at the open position.

The operation of moving the closed flapper portion 101 from the closed position to the open position can also be used when the switch gear 1 is assembled. That is, when attaching the frame body 102 to which the inner frame 102a, the flapper portion 101, the hinge portion 103, and the flapper side frames 104a and 104b are attached to the lower rear cover 12b, if the flapper portion 101 is attached in the open position, Workability is poor due to poor balance of the frame body 102, movement of the flapper portion 101, and the like. However, after the flapper portion 101 is fixed at the closed position and the frame body 102 is attached to the housing 10, the flapper portion 101 can be easily moved to the open position as shown in the present embodiment. Therefore, not only the operation of the flapper section 101 is simplified, but also workability is improved.

As described above, according to the first embodiment, the flapper device 100 includes the flapper portion 101 whose upper portion is rotatably fastened to the frame body 102 and whose lower portion has an L-shaped bent portion, and the flapper portion 101 is detachable. Flapper side frames 104a and 104b covering both side portions between the flapper portion 101 and the frame 102 held at a predetermined angle, and the inner frame of the frame. 102a, when high-temperature and high-pressure gas is generated due to arc generation, the flapper portion 101 is easily released from being held and moves from the open position to the closed position. Outflow of gas is prevented by the side frames 104a and 104b. Furthermore, since the L-shaped bent portion of the lower portion of the flapper portion 101 is engaged with the latch portion 106, it is possible to suppress rebounding of the flapper with a simple structure. Even if the gas pressure is high and the flapper part 101 rebounds from the latch part 106, the flapper part 101 moves toward the latch part 106 due to its own weight and is engaged.

Further, the latch portion 106 is provided with a release lever 106c on the opposite side of the flapper portion 101 and on the outside of the housing 10, and when the flapper portion 101 is engaged by the latch portion 106, the release lever 106c can be pulled up to easily engage. can be released. After that, the flapper part 101 is pushed inside from the outside of the housing 10, and the flapper part 101 is held by the flapper holding part 105, so that the flapper part 101 is easily returned to the open position without using a special jig. becomes possible.

Even if the flapper portion 101 is in the closed position, the flapper device 100 according to the present embodiment has a structure in which the flapper portion 101 can be easily moved to the open position. By fixing with , it is possible to carry and install in a well-balanced manner. Therefore, workability is improved.

4 and 5, only one side of the flapper holding section 105 has been described, but it is also provided on the other side of the flapper section 101, and it is desirable that the flapper holding section 105 is provided on both sides. Since the holding force of the flapper holding portion 105 is not large, the flapper portion 101 can be held in a well-balanced manner if the flapper holding portion 105 is provided on both sides. However, depending on the size and area of the flapper portion 101, the angle at the open position, etc., the flapper portion 101 may be provided on at least one side.

Embodiment 2.
A switch gear according to Embodiment 2 will be described below with reference to the drawings.
In the second embodiment, two flapper devices 100 are provided in the upper rear cover 12a and the lower rear cover 12b of the rear cable chamber 50, respectively. Since other parts are the same as those of the first embodiment, description thereof will be omitted.

8 is a right side view showing an example of the structure of the switchgear according to Embodiment 2, FIG. 9 is a perspective view showing the structure of flapper device 100 according to Embodiment 2, and FIG. It is the perspective view seen from the direction.
In FIG. 8, two flapper devices 100 are provided in the rear upper cover 12a and the rear lower cover 12b of the rear cable room 50, respectively, and the area of the rear ventilation port of the rear cable room 50 is increased to increase the amount of ventilation. 10 to suppress the temperature rise.
In FIG. 9, the flapper device 100 is obtained by vertically stacking the flapper device 100 shown in the first embodiment in two stages. By configuring in this way, it is possible to improve workability by reducing the size of each flapper device 100 and reducing the weight of each flapper section 101 . In addition, by reducing the weight of the flapper portion 101, the impact when the flapper portion 101 is in the closed position when an arc is generated is reduced, and rebounding is also suppressed. Furthermore, by attaching a plurality of frames 102 to the housing 10, the strength of the housing 10 can be improved.

In addition, as shown in FIG. 9, they may not be stacked in two stages, but may be spaced apart from each other.
Furthermore, in the case of two-tiered stacking, an integrated structure in which the frame body 102 is shared may be used.

As described above, according to the second embodiment, the same effects as those of the first embodiment are obtained. Furthermore, the flapper devices 100 can be easily arranged vertically, increasing the amount of ventilation in the housing 10 and suppressing the temperature rise in the housing 10 .

Other embodiments.
A ball catch is used as an example of the structure of the flapper holding portion 105, but other holding structures such as a holder using a magnet may be used as long as the position does not affect the gauges and devices mounted on the switchgear 1. may
Although an example in which one latch portion 106 is provided at the center of the lower portion of the inner frame 102a is shown, a plurality of latch portions 106 may be provided at the lower portion of the inner frame 102a. When the gas pressure is high, the rebound of the flapper portion 101 is well-balanced so that an excessive load is not applied to the hinge portion 103 and the like.
Further, since the latch 106a of the latch portion 106 is lowered by its own weight, it is not necessary to provide a downward biasing spring.

Although the predetermined angle of the open position of the flapper portion 101 is about 20 degrees, it is not limited to this. If the angle is increased, the ventilation area increases, which is advantageous for heat radiation characteristics. The angle should be set in consideration of these conditions.

While this disclosure describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more of the embodiments may vary from particular embodiment to embodiment. The embodiments are applicable singly or in various combinations without being limited to the application.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1: Switch gear 10: Housing 11: Door 12a: Rear upper cover 12b: Rear lower cover 13: Ventilation port 20: Breaker room 21: Breaker 30: Bus room 31: Bus bar 40: Front cable chamber 50: Rear cable chamber 51: Cable 100: Flapper device 101: Flapper part 101a: Flapper surface 101b: Flapper upper part 101c: Flapper lower part 101d, 101e: Flapper side part 102 : frame body 102a: inner frame 103: hinge portion 104a, 104b: flapper side frame 104a1, 104b1: frame surface 104a2, 104b2: flange 105: flapper holding portion 105a: catch portion 105b: ball portion 106: latch portion 106a: latch 106b: groove portion 106c: release lever.

Claims (9)

a frame;
a flapper part whose upper part is rotatably fastened to the frame and whose lower part has an L-shaped bent part;
A flapper holding part that detachably holds the flapper part at a predetermined angle is attached, and a flapper side that covers both side parts between the flapper part held at the predetermined angle and the frame. a frame;
a check valve provided on the frame and engaged with the L-shaped bent portion and disengaged by a release lever provided at a position facing the flapper portion. flapper device. The frame has an inner frame protruding in the direction of the flapper section,
The latch portion is provided at a lower portion of the inner frame, and
2. A latch projecting from a lower portion of said inner frame, a groove in which an L-shaped bent portion of said flapper portion is engaged between said latch and said frame, and said release lever. The check valve flapper device according to . 3. The check valve flapper device according to claim 2, wherein the latch portion is provided at the center of the lower portion of the inner frame. Each of the flapper side frames has a fan-shaped frame surface covering a side portion between the flapper portion and the frame body, and a flange extending from the frame surface and bent toward the flapper portion. death,
The flapper holding portion has a ball catch structure,
A ball portion is provided on at least one of the flanges of the flapper side frame,
The check valve flapper device according to any one of claims 1 to 3, wherein a catch portion is provided on the flapper portion corresponding to the ball portion of the flange. 5. The check valve flapper device according to claim 4, wherein the ball portions are provided on the flanges of the flapper side frames on both sides, and the catch portions are provided on the flapper portion so as to correspond to the ball portions. inside the housing,
a circuit breaker room in which the circuit breaker is housed;
a busbar room in which the busbars are stored;
a cable room in which cables are stored;
and a check valve flapper device according to any one of claims 1 to 5 attached to a panel of the housing. 7. The switchgear according to claim 6, wherein the check valve flapper device is provided at least below the rear side of the housing in the cable chamber. The switchgear according to claim 6 or 7, wherein the check valve flapper devices are stacked in a plurality of stages and provided on the panel of the housing. When moving the flapper portion from the closed position where the L-shaped bent portion of the flapper portion is engaged with the latch portion to the open position ,
9. The flapper holding portion according to any one of claims 6 to 8, wherein the latch portion is disengaged by a release lever and the flapper portion pushed into the housing is moved to be held by the flapper holding portion. switchgear.

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