JP5766362B2 - Switchgear - Google Patents

Description

  The present invention relates to a metal closed type switchgear in which power equipment such as a circuit breaker is accommodated, and more particularly to a structure of a switchgear having a ventilation port for taking in outside air to ventilate because the current rating is large. .

  In a metal closed type switchgear with a large current capacity rating, the conductor temperature and the surrounding air temperature rise due to Joule heat generation or induction heat generation of structures around the conductor due to energization of the conductor as the main circuit. In order to suppress this temperature rise to a certain level, the outside air around the switchgear is taken in, the air inside the switchgear is convected to lower the internal air temperature, and the conductor part etc. is kept below a certain temperature. Air intakes are provided at relatively low positions on the back and front of the gear, and air exhausts are provided on the ceiling. In addition to convection in the switchgear, it is devised to improve ventilation efficiency by utilizing the head difference between the air intake and exhaust ports. It is common to take the structure.

  When operating the switchgear, an electrical accident may occur in the main circuit inside the switchgear due to various causes, although it is extremely rare. When an electrical accident occurs, an arc is generated in that portion, and the arc energy causes a rapid internal pressure rise and high-temperature high-pressure gas in the switchgear.

  Conventional metal closed switchgear with a relatively low current rating generally does not have a ventilation intake / exhaust port, so if high-temperature and high-pressure gas is generated inside, the release gear provided on the switchgear ceiling is used. Only when the pressure release plate is opened from the pressure port, the high-temperature and high-pressure gas is discharged out of the panel. However, in the high current rated switchgear, the hot gas is ejected not only from the pressure relief port and the ventilation exhaust port on the ceiling, but also from the intake port provided on the rear or front surface of the switchgear.

  In the event of an accident, the hot gas from the ventilation exhaust port on the ceiling of the switch gear is originally provided with a pressure relief port in the event of an accident. It is necessary to suppress high-temperature gas ejection from the ventilation inlet provided on the front. For this reason, for example, in Patent Document 1, a check valve type shutter provided at the intake port portion responds to an increase in internal pressure due to an abnormal internal pressure increase at the time of a switchgear accident and closes the intake port from the inside. I am doing so. As a result, the high-temperature and high-pressure gas flows backward through the air passage to prevent discharge to the periphery of the switch gear.

WO2009 / 001425A1 publication JP 2011-4530 A Japanese Patent Laid-Open No. 9-238413

  In the conventional switchgear described above, in an electrical accident of the main circuit inside the switchgear, high-temperature and high-pressure gas is generated inside the switchgear due to an arc generated at the short circuit location. Therefore, in order to prevent gas from being ejected around the switchgear, a high-temperature, high-pressure gas ejection preventing device such as a shutter is installed.

  Normally, when an electrical accident occurs, the temperature and pressure inside the switchgear rapidly changes to a high temperature and high pressure state in about 10 ms to 50 ms. In order to prevent the high-temperature and high-pressure gas from flowing out of the switchgear through the ventilation port, a high-temperature and high-pressure gas ejection prevention device such as a shutter is installed near the inside of the switchgear of the ventilation port. The installation method fixes the frame provided with the ejection prevention device to the switchgear with a bolt.

  As shown in Patent Literature 1 and Patent Literature 2, many of the prevention devices employ a structure in which a shutter is rotated and slid using a pin or the like. It is known that the pressure inside the switchgear at the time of an electrical accident is higher by about 80 to 100 kPa than the atmospheric pressure. Therefore, in a structure having a structure that rotates using a pin or the like in an operation mechanism as shown in Patent Document 2, a large number of small and low-strength parts are used. There is a possibility that those parts are deformed by the rise and the shutter structure does not operate.

  When the number of parts increases, the parts are deformed by high temperature and high pressure gas, and the risk that the shutter structure does not operate normally is increased. On the other hand, if the strength is increased by means such as increasing the size of the components of the shutter structure, the operation becomes slow due to the mass, and the function as a shutter cannot be performed.

  The high-temperature, high-pressure gas ejection preventing device installed at the ventilation port limits the ventilation port area depending on the device. When a large vent area is provided for ventilation, it takes a long time for the high-temperature, high-pressure gas ejection prevention device to operate and completely close the vent hole. At this time, even in a small gap, high temperature gas may be ejected by the high pressure inside the box.

  As a result, it is conceivable that the high-temperature and high-pressure gas is ejected outside the switch gear before the shutter is closed. On the other hand, if the area of the ventilation port is reduced and the operation time of the ejection preventing device such as the shutter is shortened, there are problems such as difficulty in securing an area necessary for ventilation or complicated mechanisms. In particular, when the temperature inside the switch gear rises, there is a problem that equipment inside the switch gear is damaged and the life of the switch gear itself is shortened.

  Also, the area of the shutter is limited. A structure that covers the entire ventilation port can reduce the gap between the shutter and the ventilation port, so the risk of gas leakage can be minimized, but the force applied by the pressure during an electrical accident due to the large area. Increases, and the shutter is deformed, resulting in a gap. However, if a plurality of small shutters are prepared, the component size is reduced, and the number of components is further increased, thereby increasing the risk of deformation due to pressure during the electrical accident described above.

  Because of the above, in order to install a ventilation port with an area corresponding to the current rated capacity of the switchgear, it operates normally even under high pressure during an electrical accident with a small number of parts, and the size of the ventilation port area Regardless of this, there is a need for a high-temperature, high-pressure gas ejection prevention device in the event of an electrical accident in the switchgear.

  A ventilation port provided for internal cooling during normal operation of the switchgear draws air from outside the switchgear. On the other hand, in the event of an electrical accident, the hot gas generated inside flows out to the outside, so the direction of fluid flow is reversed. Furthermore, the air flow used for ventilation during normal operation is mainly air flow by natural convection due to heat generation inside the switchgear, but the fluid velocity at this time is approximately 0.5 m / s to 1.0 m. / S. In the structure as in Patent Document 3, it is necessary to divert the intake air by the length in the width direction of the ventilation port. Therefore, the air that has a slow intake flow is affected by the plate that blocks the ventilation port in the event of an electrical accident. It is thought that the loss of the flow rate is large and the flow velocity decreases.

  On the other hand, since the high temperature and high pressure gas at the time of an electrical accident reaches a pressure about 100 kPa higher than the atmospheric pressure in a short time of 10 to 50 ms, the speed becomes close to the speed of sound and becomes a high speed of 100 m / s to 300 m / s.

  The present invention has been made to solve the above-described problems, and its object is to have a shape with low resistance to a low-speed air flow in ventilation performed in normal operation, while at the time of an electrical accident. The switchgear is provided with a vent having a structure that greatly reduces the energy when high-temperature and high-pressure gas inside the casing is generated at high speed.

The switchgear according to the present invention includes a cover body in which a plurality of vent holes for venting the casing are formed, and a gas ejection preventing device that closes the vent hole formed in the cover body when the pressure in the casing increases. The gas blowout prevention device is disposed between the vent holes formed in the cover body, and is formed between a fixed armor door made of an elastic metal material and the fixed armor door. A movable armor door made of an elastic metal material that is disposed and moves by the energy of the pressure when the pressure in the housing rises and abuts the fixed armor door to close the vent hole The fixed armored door is provided with a fixed bent portion on the vent side, and the movable door is in contact with the fixed bent portion of the fixed door. Said vent movable side bent portion you sealed by closing infarction is provided, the other side of the movable side bent portion on one side of the fixed side bent portion abuts the fixed side bent portion by One side of the movable side bent portion is in contact with the other side.
The switchgear according to the present invention includes a cover body in which a plurality of vent holes for venting the casing are formed, and a gas jet for closing the vent hole formed in the cover body when the pressure in the casing increases. A switch gear having a prevention device, wherein the gas blowout prevention device is disposed between the vent holes formed in the cover body and is made of an elastic metal material, and the fixed armor door A movable door door made of an elastic metal material disposed between the doors and moving by the energy of the pressure when the pressure in the housing rises and contacting the fixed door door to close the vent hole; The fixed armored door is provided with a fixed-side bent part on the vent side, and the movable armored door is in contact with the fixed-side bent part of the fixed armored door. A movable bent portion that closes the vent is provided, the other side of the movable bent portion abuts on one side of the fixed bent portion, and the other side of the fixed bent portion One side of the movable side bent portion abuts, the movable armature door is provided with a movable side guide body, the cover body is provided with a fixed side guide body, and the movable side guide body includes a support piece and the support And an engagement body that is provided on a piece and engages with the fixed-side guide body formed on the cover body.

  According to the switchgear according to the present invention, when the pressure in the housing rises, the movable door door is moved by the pressure energy and comes into contact with the fixed door, thereby closing the vent hole formed in the cover body. Switch gear can be obtained.

It is a sectional side view which shows the switchgear concerning Embodiment 1 of this invention. It is a perspective view which shows the ejection prevention apparatus in the switchgear concerning Embodiment 1 of this invention. It is a perspective view which shows the principal part of the ejection prevention apparatus in the switchgear concerning Embodiment 1 of this invention. FIG. 3 is a cross-sectional view of a principal part showing a state before the ejection preventing device in the switchgear according to the first embodiment of the present invention is moved. FIG. 3 is a cross-sectional view of a main part showing a state after the ejection preventing device in the switchgear according to Embodiment 1 of the present invention has moved. It is principal part sectional drawing which shows the state before the movement of the ejection prevention apparatus in the switchgear concerning Embodiment 2 of this invention. It is a perspective view which shows the ejection prevention apparatus in the switchgear concerning Embodiment 3 of this invention. It is principal part sectional drawing which shows the state before the movement of the ejection prevention apparatus in the switchgear concerning Embodiment 4 of this invention. It is a perspective view which shows the principal part of the ejection prevention apparatus in the switchgear concerning Embodiment 4 of this invention. It is sectional drawing which shows the principal part of the ejection prevention apparatus in the switchgear concerning Embodiment 5 of this invention. It is sectional drawing which shows the principal part of the ejection prevention apparatus in the switchgear concerning Embodiment 6 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. In the drawings, the same or equivalent members and parts are denoted by the same reference numerals. 1 is a side sectional view showing a switchgear according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an ejection preventing device for a switchgear according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a main part of the ejection preventing device in the switchgear according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view of a main part showing a state before the ejection preventing device in the switchgear according to the first embodiment of the present invention is moved. FIG. 5 is a cross-sectional view of the main part showing the state after the ejection preventing device in the switchgear according to Embodiment 1 of the present invention has moved.

  First, the internal structure of the switchgear will be described with reference to FIG. The interior of the ground metal casing 1 is partitioned into a plurality of compartments. A circuit breaker compartment 3 in which the drawer type circuit breaker 2 is accommodated is arranged on the left side (the front side of the switchgear) of FIG. 1, and this drawer type circuit breaker 2 can be pulled out from the front side. On the rear wall of the circuit breaker compartment 3, disconnections 4a and 4b of the main circuit are fixed at a predetermined interval in the vertical direction, and the connection projecting to the rear surface (right side in FIG. 1) of the drawer type circuit breaker 2 It can be attached to and detached from the terminal. The disconnecting portions 4a and 4b are provided with main circuit terminals 5a and 5b. Above the circuit breaker compartment 3 is a control device compartment 6 in which a control instrument (not shown) is accommodated.

  The upper rear side of the circuit breaker compartment 3 is a bus compartment 9 in which a three-phase bus 7 is supported by a support insulator 8 and is connected to one end side of the drawer type circuit breaker 2. The main circuit terminal 5a and the bus 7 are connected by a branch conductor 10 and housed. Behind the bus compartment 9 and below is a cable compartment 12 in which the load-side cable 11 is housed.

  The main circuit terminal 5b of the disconnecting portion 4b connected to the other end of the drawer type circuit breaker 2 and the cable 11 are provided with a load-side conductor 13 passing through the current transformer 14 in the middle. A ground switch 15 is connected to the main circuit terminal 5b.

  An intake section 16 for performing intake from the outside is provided below the cable chamber on the right side (the rear side of the switch gear) in FIG. 1. The switch gear facing the intake section 16 includes a switch gear during normal operation. A gas ejection preventing device 20 is provided for preventing the outflow of high temperature and high pressure gas to the outside of the switchgear due to internal ventilation and at the time of an electrical accident. In such a switchgear, it is known that an electrical accident occurs mainly in the circuit breaker compartment 3, the busbar compartment 9, and the cable compartment 12 where the main circuit is arranged.

  Next, an example of the structure of the vent and the gas ejection preventing device 20 for high-temperature and high-pressure gas will be shown based on FIG. 2, FIG. 3 and FIG. FIG. 2 shows the structure of the gas ejection preventing device 20 from the outside of the switchgear. FIG. 3 shows the structure of the gas ejection preventing device 20 from the inside of the switchgear. FIGS. 2 and 3 are installed in the intake portion 16 provided in the switchgear casing 1, and use of a cover body 21 provided with a plurality of strip-shaped vents 22 prevents foreign objects from entering. Structure.

  In addition, the cover body 21 is generally provided with an inclined member (not shown) having an angle in order to prevent the entry of foreign matters from an angle that is smaller than the vent hole 22 or from the inclined angle. In this Embodiment 1, the case where it installs as shown in FIG. 2 inside the cover body 21 as what gives the function of an inclination member to the fixed yoro door 23 mentioned later is shown.

  The gas ejection preventing device 20 is disposed between a fixed armor door 23 and a fixed armor door 23 respectively disposed between a plurality of vent holes 22 formed in the cover body 21. The movable door door 24 is configured to move by the pressure energy and contact the fixed door door 23 to close the vent 22.

  The movable door 23 is provided with a movable side guide body 25, a fixed side guide body 26 is provided on the side surface of the cover body 21, and the movable side guide body 25 is configured to be movable by engagement with the fixed side guide body 26. Has been. As an example, the movable-side guide body 25 includes a support piece 27 and an engagement body 28 that is provided on the support piece 27 and that is a fixed-side guide body 26 formed on the side surface of the cover body 21 and that engages with a guide groove, for example. I have.

  The fixed armor door 23 is provided with fixed side bent portions 29a and 29b at the end on the air vent 22 side, and the movable armor door 24 is respectively connected to the fixed side bent portions 29a and 29b of the fixed armor door 23. The movable side bent portions 30a and 30b that close the vent port 22 by contact are provided, the movable side bent portion 30b on the other side abuts on the fixed side bent portion 29a on one side, and the fixed side folding on the other side. The movable side bent portion 30a on one side is in contact with the bent portion 29b.

  The engaging body 28 which is the movable side guide body 25 of the movable door 24 is engaged and installed along the fixed side guide body 26 formed by a guide groove provided on the side surface of the cover body 21. Due to the pressure energy of the high temperature and high pressure gas at the time of an electric accident or the like, the movable door door 24 is pushed outward of the switchgear, that is, by being pushed toward the vent 22 formed in the cover body 21. The movable side bent portions 30a, 30b of the Yoroi door 24 and the fixed side bent portions 29a, 29b of the fixed Yoroi door 23 overlap each other, and the vent 22 is closed to block the gas flow path.

  Since the fixed armature door 23 and the movable armature door 24 are long in the width direction of the switchgear and are about the width of the strip-shaped vent 22 in the height direction, the air that has passed through the fixed armature door 23 is sucked. Air is taken into the switchgear by bypassing the movable armature door 24 up and down. As a result, energy loss due to intake air can be reduced.

  Further, high temperature and high pressure gas at the time of an electrical accident inside the switchgear collides with the fixed armor door 23 at a high speed, so that the vicinity of the fixed armor door 23 becomes a high pressure state, and the pressure becomes resistance, so that it leaks until the shutter operates. In addition to reducing the amount of gas, the energy of high temperature and high pressure gas can be attenuated.

  Next, the operation of the gas ejection preventing device 20 will be described with reference to FIGS. 4 and 5. 4 shows the positional relationship between the fixed door door 23 and the movable door door 24 in the normal state of the switchgear, and FIG. 5 shows that the movable door door 24 moves and is fixed by the energy of the pressure when the pressure in the housing 1 rises. The state which is contacting with the Yoroi door 23 and obstruct | occluding the vent hole 22 is shown.

  FIG. 4 shows a state during normal operation of the switchgear, where the fixed door 23 and the movable door 24 are separated from each other, and the air outside the switchgear enters each vent 22 as shown by arrow A1. The air that flows in and flows into each vent 22 is formed between the fixed side bent portion 29a on one side of the fixed door 28 and the movable side bent portion 30b on the other side of the movable door 24 as shown by arrow A2. The air that has passed through the switchgear and has flown into the switchgear 22 and that has flowed into the vent 22 is indicated by an arrow A3, and one of the fixed side bent portion 29b on the other side of the fixed end door 23 and the movable end door 24 is shown. Between the movable side bent portion 30a on the side and the inside of the switch gear.

  In this way, the air that has been sucked and passed through the vents 22 passes between the fixed doors 23 and the movable doors 24, bypasses the upper and lower sides of the movable doors 24, and is taken into the switch gear. As a result, when air is exchanged between the inside and outside of the switchgear, the loss experienced by the low-speed air flow during ventilation is low, and the loss of energy due to intake air can be kept small.

  In FIG. 4, when the pressure in the housing 1 rises due to an electrical accident or the like inside the switchgear, each movable door 24 is moved to each vent 22 side as indicated by arrow B by the energy of the pressure. become.

  A gas having a pressure about 100 kPa higher than the atmospheric pressure generated inside the switchgear due to an electrical accident or the like moves toward the vent 22 of the switchgear and tries to lower the internal pressure. According to the first embodiment, the structure for preventing the ejection of high-temperature and high-pressure gas uses a structure and arrangement that is easily subjected to the force due to the pressure in the traveling direction of the gas having a high pressure. On the other hand, it becomes possible to operate in a short time. Furthermore, a device that prevents the ejection of high-temperature and high-pressure gas can use a high pressure inside the switchgear to block the gas flow path and increase the sealing degree by the elasticity of the device.

  Therefore, when the pressure in the housing 1 rises due to an electrical accident or the like, each movable door door 24 moves to the side of each vent 22 as indicated by arrow B by the energy of the pressure. Each movable armature door 24 has a movable side guide body 25 that is a fixed side guide body 26 formed on the side surface of the cover body 21. The door 24 is moved, and by the movement of each movable armor door 24, the fixed side bent part 29a on one side of each fixed armor door 23 and the movable side bent part 30b on the other side of each movable armor door 24 come into contact. The fixed side bent part 29b on the other side of each fixed armor door 23 and the movable side bent part 30a on one side of each movable armor door 24 come into contact with each other to close the vents 22 and the high temperature in the housing 1 is reached. Further, it is possible to prevent the high-pressure gas from being ejected outside the switchgear.

  The fixed armor door 23 and its fixed side bent portions 29a and 29b and the movable armor door 24 and its movable side bent portions 30a and 30b are fixed by being made of a metal material having elasticity such as steel. The areas of the fixed-side bent portions 29a and 29b of the armor door 23 and the movable-side bent portions 30a and 30b of the movable armor door 24 are pressed against each other using the high-temperature, high-pressure gas pressure energy in the housing 1. The degree of sealing can be increased.

  In addition, since the movable door door 24 is installed perpendicular to the direction in which the high-temperature, high-pressure gas switch gear moves outside the housing 1, parts used for the rotating mechanism and the like are not required, and the structure is simple. The time until the operation by pressure can be shortened.

  Note that the configurations shown in FIGS. 1 and 2 are examples, and the present invention is not limited to these arrangement configurations. The intake section may have a configuration provided on the left side (switch gear front side) of the drawing, the switch gear floor surface section, or other configurations. Moreover, the case where it installs in the direction of the bending part of each Yoroi door may be sufficient, and the shape may change.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the main part showing a state before the ejection preventing device in the switchgear according to the second embodiment of the present invention moves.

  In the first embodiment described above, when the pressure in the housing 1 rises due to an electrical accident or the like, each movable door door 24 moves in the horizontal direction due to the pressure energy in the horizontal direction and comes into contact with each fixed door 23. The case where each vent 22 is closed to prevent the high temperature and high pressure gas inside the case 1 from being ejected outside the switchgear has been described. The case where the pressure energy of an up-down direction acts at the time of a pressure rise in is shown.

  FIG. 6 shows a case where pressure energy acts from the bottom to the top as an example. The movable door 31 is provided with a movable guide body 32, and the cover 21 is provided with a fixed guide body 33 on the side surface. The side guide body 32 is configured to be movable in the vertical direction by engaging with the fixed side guide body 33. As an example, the movable side guide body 32 is a fixed side guide body 33 provided on a side surface of the cover body 21 provided on a support piece (not shown) and a support piece (not shown), for example, in a guide groove. And an engaging body 34 to be engaged.

  The movable armature door 31 is provided with movable side bent portions 35a and 35b that close the vent 22 by contacting the fixed side bent portions 29a and 29b of the fixed armor door 23, respectively. The movable side bent portion 35b on the other side is in contact with the portion 29a, and the movable side bent portion 35a on the one side is in contact with the fixed side bent portion 29b on the other side.

  The engaging body 34 which is the movable side guide body 32 of the movable door 31 is engaged and installed along the fixed side guide body 33 formed by a guide groove provided on the side surface of the cover body 21, and is installed inside the switchgear. When the movable armor door 31 is pushed upward by the pressure energy of the high temperature and high pressure gas at the time of an electric accident or the like, the movable side bent portions 35a and 35b of the movable armor door 31 and the fixed armor door 23 are fixed. The side bent portions 29a and 29b overlap with each other, and the vent 22 can be closed to block the gas flow path.

  The fixed armor door 23 and the movable armor door 31 are long in the width direction of the switchgear, and are about the width of the strip-shaped vent 22 in the height direction. Air is taken into the switchgear by bypassing the movable door 31 up and down. As a result, the loss experienced by the low-speed air flow during ventilation when exchanging air inside and outside the switchgear is low, and the loss of energy due to intake air can be reduced.

  Further, high temperature and high pressure gas at the time of an electrical accident inside the switchgear collides with the fixed armor door 23 at a high speed, so that the vicinity of the fixed armor door 23 becomes a high pressure state, and the pressure becomes resistance, so that it leaks until the shutter operates. In addition to reducing the amount of gas, the energy of high temperature and high pressure gas can be attenuated.

  In FIG. 6, when the pressure in the housing 1 rises due to an electrical accident or the like inside the switchgear, each movable door door 24 moves upward as indicated by an arrow C by the energy of the pressure. .

  A gas having a pressure about 100 kPa higher than the atmospheric pressure generated in the switchgear at the time of an electrical accident moves toward the vent 22 of the switchgear and tries to lower the internal pressure. According to the second embodiment, the structure for preventing the ejection of high-temperature and high-pressure gas uses a structure and arrangement that easily receives the force due to the pressure in the upward direction of the gas having a high pressure. It is possible to operate in a short time. Furthermore, a device that prevents the ejection of high-temperature and high-pressure gas can use a high pressure inside the switchgear to block the gas flow path and increase the sealing degree by the elasticity of the device.

  Accordingly, when the pressure in the housing 1 rises, each movable door 31 is moved upward as indicated by arrow C by the energy of the pressure. Each movable armor door 31 has a movable side guide body 32 which is a fixed side guide body 33 formed on the side surface of the cover body 21. The door 31 moves upward, and the movement of each movable armor door 31 causes a fixed side bent part 29a on one side of each fixed armor door 23 and a movable side bent part 35b on the other side of each movable armor door 31 to move. The fixed side bent portion 29b on the other side of each fixed armor door 23 and the movable side bent portion 35a on one side of each movable armor door 31 come into contact with each other to close the vents 22 to contact each other. It is possible to prevent the high temperature and high pressure gas from being ejected outside the switchgear.

  The fixed armor door 23 and its fixed-side bent portions 29a and 29b and the movable armor door 31 and its movable-side bent portions 35a and 35b are fixed by being made of a metal material having elasticity such as steel. The areas of the fixed-side bent portions 29a and 29b of the armor door 23 and the movable-side bent portions 35a and 35b of the movable armor door 31 are pressed against each other using the high-temperature and high-pressure gas pressure energy in the housing 1. The degree of sealing can be increased.

  Moreover, since the movable armor door 31 is installed so as to move upward with respect to the upward movement of the high-temperature and high-pressure gas in the housing 1, parts used for the rotation mechanism and the like are no longer necessary. The structure is simple and the time to operation by pressure can be shortened.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view showing an ejection preventing device for a switchgear according to Embodiment 3 of the present invention.

  In each of the above-described embodiments, the gas ejection preventing device 20 including the cover body 21, the fixed armature door 23, and the movable armature door 24 is arranged in one stage to close the vent hole 22, and the electric power inside the switchgear. Although the case where the high-temperature and high-pressure gas in the casing 1 is prevented from being ejected from the vent 22 due to an accident or the like has been described, in the third embodiment, the cover body 21, the fixed armature door 23 and the movable armature door 24 are used. Are arranged in a plurality of stages, for example, two stages as an example to prevent the ejection of high temperature and high pressure gas in the housing 1 due to an electrical accident inside the switchgear. It is.

  According to the third embodiment, by arranging a plurality of gas ejection preventing devices 20 composed of the cover body 21, the fixed armature door 23, and the movable armature door 24 in a plurality of stages, the inside of the housing 1 in the event of an electrical accident. The degree of blockage of the flow path of high temperature and high pressure gas can be further increased. Since the structure of the third embodiment has low resistance to the air to be sucked in, even if this structure is installed in a plurality of stages in the intake part of the switchgear, its ventilation performance is not greatly deteriorated. Since the high-temperature, high-pressure gas flow path in 1 is blocked over a plurality of stages, the degree of sealing can be further increased.

Embodiment 4 FIG.
Embodiment 4 of the present invention will be described with reference to FIGS. 8 and 9. In each figure, the same or equivalent members and parts will be described with the same reference numerals. FIG. 8 is a cross-sectional view of a principal part showing a state before the ejection preventing device in the switchgear according to the fourth embodiment of the present invention moves. FIG. 9 is a perspective view showing an essential part of the ejection preventing device in the switchgear according to Embodiment 4 of the present invention.

  In the fourth embodiment, after the pressure rise in the housing 1 due to an electrical accident or the like, the movable armor door 24 is moved by the pressure energy to come into contact with the fixed armor door 23 and close the vent 22. When the pressure inside the switch gear returns to the normal pressure, a drive body 36 made of, for example, a drive spring is provided to return the movable door door 24 to the initial position.

  A drive body 36 made of a drive spring is installed on the movable door 24, that is, a drive body 36 made of a drive spring is installed between the support piece 27 of the movable side guide body 25 and the support plate 21a of the cover body 21. In some cases, the holding mechanism is configured so that the movable door door 24 does not malfunction due to the tension of the spring. As described above, the pressure at the time of an electrical accident in the switchgear is about 100 kPa higher than the atmospheric pressure, so that the tension enough to hold the weight of the movable door 24 is lower than the pressure at the time of an electrical accident. Therefore, the operation performance is maintained.

  When the pressure in the housing 1 rises due to an electrical accident or the like, each movable door 24 is against the tension of the drive spring which is the drive body 36 by the energy of the pressure, as shown by the arrow B in each vent 22 side. Move to each. Each movable armature door 24 has a movable side guide body 25 that is a fixed side guide body 26 formed on the side surface of the cover body 21. The door 24 is moved, and by the movement of each movable armor door 24, the fixed side bent part 29a on one side of each fixed armor door 23 and the movable side bent part 30b on the other side of each movable armor door 24 come into contact. The fixed side bent part 29b on the other side of each fixed armor door 23 and the movable side bent part 30a on one side of each movable armor door 24 come into contact with each other to close the vents 22 and the high temperature in the housing 1 is reached. Further, it is possible to prevent the high-pressure gas from being ejected outside the switchgear.

  In addition, when an electrical accident or the like is recovered and the pressure inside the switchgear returns to a normal pressure, each movable door door 24 is returned to the initial position by the restoring force of the drive spring as the drive body 36. Can do.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view showing a main part of the ejection preventing device in the switchgear according to Embodiment 5 of the present invention.

  In the fifth embodiment, the fixed armor door 23 has a structure in which fixed side bent portions 29a and 29b are provided, and the movable armor door 37 is configured by a flat plate. By adopting the movable armor door 37 using a flat plate, the man-hours required for processing the movable armor door 37 can be reduced.

Embodiment 6 FIG.
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a cross-sectional view showing a main part of the ejection preventing device in the switchgear according to Embodiment 6 of the present invention.

  In the fifth embodiment, the movable armor door 24 has a structure in which the movable side bent portions 30a and 30b are provided, and the fixed armor door 38 is configured by a flat plate. By using the fixed armor door 38 using a flat plate, the man-hours required for processing the fixed armor door 38 can be reduced. Further, when the fixed armor door 38 is formed of a flat plate, the member between the vent holes 22 of the cover body 21 can also be used as a fixed armor door.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  This invention has a shape with low resistance to a low-speed air flow in ventilation performed in normal operation. On the other hand, when a high-temperature, high-pressure gas inside the casing that is generated during an electrical accident or the like is ejected, its energy is This is suitable for realizing a switchgear that can greatly reduce.

1 housing, 20 gas blowout prevention device, 21 cover body, 22 vent,
23 fixed armor doors, 24 movable armor doors, 25 movable side guide bodies,
26 fixed side guide body, 27 support piece, 28 engagement body,
29a fixed side bent part, 29b fixed side bent part, 30a movable side bent part,
30b Movable side bent portion, 31 Movable door door, 32 Movable side guide body,
33 fixed side guide body, 34 engaging body, 35a movable side bent portion,
35b Movable side bent part, 36 driving body, 37 movable armored door,
38 Fixed armored door.

Claims (6)

A switchgear comprising: a cover body in which a plurality of ventilation holes for venting the casing are formed; and a gas ejection preventing device for closing the ventilation hole formed in the cover body when the pressure in the casing rises. The gas ejection preventing device is disposed between the fixed yoro doors formed of an elastic metal material disposed between the vent holes formed in the cover body, and is disposed between the fixed yoro doors. The fixed armor door is provided with a movable armor door made of an elastic metal material that closes the vent hole by moving by the energy of the pressure when the pressure rises and abuts the fixed armor door, with the fixed side bent portion to the vent side is provided, the vent was closed busy by each coming into contact with the fixed-side bent portion of the fixed endpiece door to the movable armor door closed That the movable side bent part is provided, the other side of the movable side bent portion on one side of the fixed side bent portion abuts one of the movable side bent portion on the other side of the fixed side bent portion A switchgear characterized in that the sides abut.   The movable door door is provided with a movable side guide body, the cover body is provided with a fixed side guide body, and the movable side guide body is configured to be movable by engagement with the fixed side guide body. The switchgear according to claim 1, wherein   A switchgear comprising: a cover body in which a plurality of ventilation holes for venting the casing are formed; and a gas ejection preventing device for closing the ventilation hole formed in the cover body when the pressure in the casing rises. The gas ejection preventing device is disposed between the fixed yoro doors formed of an elastic metal material disposed between the vent holes formed in the cover body, and is disposed between the fixed yoro doors. The fixed armor door is provided with a movable armor door made of an elastic metal material that closes the vent hole by moving by the energy of the pressure when the pressure rises and abuts the fixed armor door, A fixed-side bent portion is provided on each of the vent holes, and each movable armor door is movable so as to close the vent hole by abutting with the fixed-side bent portion of the fixed armor door. A bent portion is provided, the other side of the movable side bent portion abuts on one side of the fixed side bent portion, and one side of the movable side bent portion abuts on the other side of the fixed side bent portion. The movable armature door is provided with a movable side guide body, the cover body is provided with a fixed side guide body, and the movable side guide body is provided on a support piece and the support piece and formed on the cover body. A switchgear comprising an engaging body that engages with the stationary guide body.   The bent portion is formed in one of the movable door or the fixed door, and the other side of the movable door or the fixed door is a flat plate. The switchgear according to 3.   A drive body is provided for returning the movable armature door after the movable armature door is moved by the energy of the pressure when the pressure in the housing rises and contacts the fixed armor door to close the vent. The switchgear according to any one of claims 1 to 4, characterized in that:   The switchgear according to any one of claims 1 to 5, wherein the gas ejection preventing devices are arranged in a plurality of rows.

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