KR101826810B1 - Gas breaker - Google Patents

Abstract

A mechanical funnel 32 is installed in series in the heat transfer chamber 21 and a heat pump chamber 21 is partitioned into the heat transfer chamber 21 in the radial direction so as to provide a gas- And a partitioning portion (41) for dividing the inner peripheral side space (61) into the outer peripheral side space (62) is provided. A switching valve 42 is provided as a gas flow control means between the arc space 31 and the heat transfer chamber 21 so that the communication between the heat transfer chamber 21 and the partition wall 17 A valve (23) capable of opening and closing the valve (18) is provided. The high-temperature, high-pressure, high-pressure, high-pressure gas from the arc space 31 is discharged from the outer circumferential side space 62 of the partitioning member 41 to the arc through the inner circumferential side space 61 by the switching valve 42 Spray. At the time of the interruption of the small current, the small gas from the machine funnel 32 is guided only to the inner space 61 of the partition member and is injected into the arc.

Description

Gas breaker {GAS BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker, and more particularly, to a gas circuit breaker of a perforated type using a mechanical compression action and a heat boost action by arc heat.

The thermal-purged type gas circuit breaker including both the thermal perfor- mance and the mechanical perfor- sil is suitable for interrupting a large current and can be used for a system having a high voltage. On the other hand, there is a problem that it is difficult to cut off the small current. Therefore, in recent years, attempts have been made to enable not only a large current but also a small and medium current to be blocked by using a gas circuit breaker of a perforated type.

For example, Japanese Patent Application Laid-Open No. 2009-99499 (Patent Document 1) discloses a gas circuit breaker for shutting off a small current to a large current. The gas circuit breaker described in Patent Document 1 (hereinafter referred to as a conventional example) is shown in Fig.

A divided member 102 for dividing the room into a main space 101a and a longitudinal space 101b is provided in the thermal booster chamber 101 (thermal perforation chamber) As shown in Fig. The main space 101a is spatially connected to a mechanical compression chamber (mechanical pump chamber) 105 via a gas passage 103 connected to the arc space side and an opening 104a of the partition 104. [

The main space 101a is set to have a volume capable of being stepped up to a high-temperature and high-pressure state by arc energy even in the case of interruption of a small current. A communicating portion 102a is provided in the vicinity of the flange 106 side end portion of the divided member 102 and a communicating portion 102b is provided in the vicinity of the outer peripheral end portion of the partition wall 104. [

At the time of high current interruption, gas of high temperature and high pressure generated in the arc space passes through the main space 101a, and the opening portion 104a is closed by pressing the check valve 107 by the pressure. Thereafter, the gas of high temperature and high pressure flows in the nozzle space in the longitudinal space 101b via the communicating portion 102b.

At this time, the high-temperature and high-pressure gas is mixed with the relatively low-temperature gas existing in the longitudinal space 101b. As a result, the gas which has become relatively low in temperature passes through the gas passage 103 from the communication portion 102a through the opening portion 106a, and is injected into the arc (hereinafter, this phenomenon is referred to as a circulation effect). That is, in the conventional example, it is aimed to improve the shutoff performance by relatively lowering the temperature of the injected gas at the time of shutting off the large current.

In addition, at the time of the interruption of the medium current, the pressure of the main stream 101a is gradually lowered in the vicinity of the zero point of the current, so that the pressure in the mechanical compression chamber 105 is lowered. As a result, gas flowing from the mechanical compression chamber 105 to the main space 101a of the thermal booster chamber 101 is assumed to be generated.

The sum of the sectional areas of the communication portions 102a and 102b is made smaller than the sectional area of the opening portion 106a of the gas passage so that the pressure applied to the communication portions 102a and 102b is increased, It is intended to prevent the gas flow from being separated toward the longitudinal space 101b side, thereby reducing the pressure drop.

However, the conventional example has the following problems. Since the sum of the cross-sectional areas of the communicating portions 102a and 102b is made smaller than the cross-sectional area of the opening portion 106a of the gas passage at the time of high current interruption, the pressure applied to the communicating portions 102a and 102b rises, There is a fear that the circulation effect can not be achieved because the air does not flow well from the communication part 102b.

Even if a high-temperature high-pressure gas generated by the arc flows from the communicating portion 102b to the longitudinal space 101b side, since the cross-sectional area of the communicating portion 102a is small, the amount of gas flowing out from the communicating portion 102a There is a possibility of remarkable reduction.

Even if the gas flows out from the communicating portion 102a, the outflowed gas flows not only in the direction of the gas passage 103 but also in the direction of the main space 101a, so that the amount of the gas flowing in the direction of the gas passage 103 becomes . For this reason, in the conventional example, there is a problem that the circulation effect is weak and the arc extinguishing performance is bad.

The gas flow from the mechanical compression chamber 105 to the main space 101a of the thermal booster chamber 101 is transferred from the communication portion 102a or the communication portion 102a to the vertical space 101b, There is a possibility that the effect of reducing the classification of the gas may not be obtained.

The object of the present invention is to provide a gas circuit breaker which reliably realizes a circulation effect when a large current is interrupted so that a relatively low temperature gas is injected into an arc and a gas flow path is formed from an outer peripheral side space of the heat transfer chamber to an inner peripheral side space So that it is possible to inject gas into the arc while maintaining the momentum of the gas flow as much as possible, thereby improving the SOHO performance. In addition, even when a small current interruption occurs, the gas can be surely prevented from being partitioned, thereby improving the SOHO performance.

The present invention relates to an electric arc welding machine comprising a container filled with a small gas, a pair of main contacts capable of being separated from each other, a fixed arc contactor, a movable arc contactor capable of mating with the fixed arc contactor, An arc space formed between the arc contacts in the insulating nozzle when the stationary arc contactor and the movable arc contact are opened, and an arc space formed between the arc arc contacts in the arc space, And a mechanical pressurizing chamber for increasing the pressure by mechanical compression, wherein the mechanical pressurizing chamber is provided between the heat transfer chamber and the mechanical perforation chamber, A partition for dividing the inside of the heat pump chamber into the outer peripheral space and the inner peripheral space, Wherein the partitioning member is provided with an opening at an end portion of the insulating nozzle and a portion at the end of the machine pumper, respectively, wherein when the pressure of the arc space rises in an opening of the insulating nozzle side end portion, Closing the inner circumferential side space of the thermal perforation chamber and opening the insulating nozzle side end portion and opening the inner circumferential side space of the heat transfer chamber when the pressure of the arc space is lowered, And a gas flow control means for closing the outer peripheral side space and the inner peripheral side space of the heat pump chamber when the pressure of the arc space rises to communicate with the communication portion of the partition wall, When the pressure of the persil rises, a movable valve is opened to form a flow path to the inner peripheral side space of the heat pump chamber, And that the feature.

The gas flow control means of the present invention is constituted by a switching valve which has a surface closing the opening of the insulating nozzle side end portion and a surface closing the space on the inner peripheral side of the heat transfer chamber and sliding along the inner peripheral surface of the partitioning member .

The gas flow control means of the present invention is characterized in that the gas flow control means includes the partitioning member provided with a cutout portion on the inner peripheral side of the insulating nozzle side end portion, a switching valve for sliding the cutout portion in the axial direction, And a sealing member disposed in a radial direction so as to close a flow path between the space and the switching valve, wherein when the switching valve is engaged with the mechanical puffer actual side end portion of the cutout portion, And the outer surface side of the sealing member face each other.

The switching valve is characterized in that the surface of the end portion on the side of the insulating nozzle is formed on a smooth guide surface of the liquefied gas.

In addition, when dividing the inside of the thermal perforation chamber into the outer peripheral side space and the inner peripheral side space by dividing the inside of the thermal perforation chamber by the partitioning member, a polymer material having an ablation effect is provided in the outer peripheral side space of the thermal perforation chamber .

According to the gas circuit breaker of the present invention, by using the gas flow control means, the following effects can be obtained when the large current is cut off. As a result of the arc opening, an arc gas of high temperature and high pressure is generated in the arc space. This low-temperature gas is guided to the outer peripheral side space of the partition member of the thermal perforation, and mixed with the low-temperature algae gas existing in the outer peripheral side space, thereby becoming a relatively low-temperature algae gas. Thereafter, the arc is contracted to lower the pressure in the arc space, and the inner circumferential passage of the partitioning member is formed by the operation of the rectifying means having this influence. The relatively low-temperature quenching gas is injected into the arc through the inner circumferential passage while maintaining the momentum of the gas flow. The circulation effect can be reliably realized, and the soho performance can be improved. In addition, the following effects can be obtained in the case of a small current interruption. As the pressure of the mechanical funnel increases, the movable valve disposed in the outer peripheral side space of the partition plate operates, and the soot gas flowing into the heat transfer chamber from the mechanical funnel chamber is divided into the outer peripheral side space of the partitioning member It is possible to reliably prevent such a problem, so that the SOHO performance can be improved.

The partitioning member is provided with a cutout portion on the inner circumferential side of the insulating nozzle side end portion, a switching valve that slides the cutout portion in the axial direction, and a flow path between the space on the inner circumferential side of the heat pump chamber and the switching valve When the gas flow control means is constituted by the sealing member arranged in the radial direction so as to close the valve, the axial flow resistance of the switching valve and the sealing member disappears, thereby making it possible to reduce the fluid resistance. As a result, it is possible to more efficiently inject the small gas into the arc. In addition, since the surface of the switching valve on the side of the insulating nozzle is shaped to be a smooth guide surface of the gaseous gas, the gaseous gas can be effectively introduced into the outer peripheral side space of the partitioning member.

In addition, in the case of the small current interruption, the movable valve is displaced in the direction of the partition member by the pressure difference between the mechanical pump chamber and the heat pump chamber. This movable valve is brought into close contact with the machine puffer actual side end portion, thereby separating the outer peripheral side space and the inner peripheral side space of the heat purge chamber. As a result, it is possible to prevent the small gas from being classified into the outer peripheral side space.

The liquefied gas from the machine funnel is injected into the arc space only through the inner space while maintaining its flow momentum. As a result, it is possible to improve the SOHO performance at the time of interrupting the small current.

Further, if a polymer material having an ablation effect is provided in the thermal per chamber, the high-temperature exothermic gas introduced can be brought into direct contact with the polymer material having the ablation effect. This makes it possible to increase the pressure in the heat transfer chamber efficiently and obtain a further high breaking performance.

1 is a cross-sectional view showing a state of a heat transfer chamber before an arc is generated in a gas circuit breaker according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing a state of a heat transfer chamber at the time of occurrence of an arc in Fig. 1. Fig.
3 is a cross-sectional view showing the state of the heat transfer chamber at the time of the low-pressure gas injection in FIG.
4A and 4B are enlarged cross-sectional views showing an example of the gas flow control means in the gas circuit breaker of the present invention.
5 (a), 5 (b) and 5 (c) are enlarged cross-sectional views showing another example of the switching valve used in the gas circuit breaker of the present invention.
FIG. 6 is a cross-sectional view showing a state of a heat transfer chamber at the time of a low-pressure gas injection in a gas circuit breaker according to another embodiment of the present invention. FIG.
7 is a cross-sectional view showing a state of a heat transfer chamber at the time of occurrence of an arc in a gas circuit breaker according to another embodiment of the present invention.
8 is a cross-sectional view showing a breaking portion of a conventional gas circuit breaker.

Hereinafter, each embodiment of the gas circuit breaker of the present invention will be described with reference to the drawings. The present invention is not limited to the following examples, and the shape and configuration of each part can be appropriately changed without departing from the gist of the present invention.

[Example 1]

As shown in Fig. 1, the shut-off portion of the gas circuit breaker according to the embodiment of the present invention includes a thermal funnel 21 and a machine funnel chamber 32 having a variable volume. The partition wall 17 forms a communicating portion 18, Are arranged in series. A cylindrical partitioning member 41 is disposed in the heat transfer chamber 21 so as to divide the inside of the heat transfer chamber 21 into a radially inner space 61 and a radially outer space 62.

1, the communicating portion 18 serving as an opening formed in the partition wall 17 is provided on the side of the cylinder 15 in the example shown in Fig. 1, It can be installed at a position that does not interfere with the inflow of the gas.

The partitioning member 41 has the following structure, for example. A cylindrical member which is disposed coaxially with the heat pump chamber 21 and divides the heat pump chamber 21 in the radial direction is used and the outer periphery of the cylindrical member is divided into quadrants at intervals of 90 degrees, (Not shown) extending to the inner circumference of the cylinder 15 along the axial direction of the cylindrical member. The partition member 41 having the support member is fixed in the heat transfer chamber 21 by fitting the inner peripheral surface of the cylinder 15 to the inner peripheral surface of the cylinder 15.

Further, the partitioning member 41 having the support member is preferably made of aluminum so as to reduce the weight of the blocking portion. The partition member 41 is made of aluminum and can be expected to have an effect of cooling the high-temperature, high-pressure and high-pressure gas introduced into the heat transfer chamber 21. The end portions of the insulating nozzle 14 at both ends of the partition member 41 And the outer peripheral side space 62 of the heat transfer chamber 21 divided by the partitioning member 41 are provided in the end portions of the inner peripheral side space 61 and the mechanical funnel chamber 32 side, .

A switching valve (42) and a sealing member (43) are disposed at the end of the heat pump chamber (21) on the side of the insulating nozzle (14). The sealing member 43 has a disk shape and is fixed to the peripheral side of the hollow rod 16 and also to the side of the mechanical funnel chamber 32 than the opening 53 of the partitioning member 41. The switching valve 42 is in the form of a cylinder having a hollow portion with a diameter smaller than the outer diameter of the sealing member 43 and is caught by the sealing member 43. The outer circumferential surface of the cylinder of the switching valve 42 is loosely fitted to the inner circumferential surface of the partitioning member 41. Thereby, the switching valve 42 is slidable in the axial direction with the inner peripheral surface of the partitioning member 41 serving as a guiding surface.

2, when an arc is generated in the arc space 31 and the gas pressure at this portion rises, due to the pressure difference between the arc space 31 and the heat transfer chamber 21, (42) is pressed and displaced in the direction of the sealing member (43). The switching valve 42 closes the flow path 51 between the partitioning member 41 and the sealing member 43 and opens the opening 53 at the side of the insulating nozzle 14 side.

When the movable arc contact 11 and the fixed arc contact 12 are brought into the open state, the switching valve 42 and the sealing member 43 are closed by the switching valve 42 and the sealing member 43, And serves as gas flow control means for guiding the gas to the outer circumferential side space 62.

In addition to this, a partition wall 17 which interrupts the thermal perforation 21 and the machine perforation 32 is provided on the outer periphery of the hollow rod 16. The communicating portion 18 connecting the heat pump chamber 21 and the mechanical pump chamber 32 and the movable valve 23 opening and closing the communicating portion 18 are disposed on the outer circumferential side space of the partition member 41, Is disposed near the mechanical pump chamber (32) on the side of the engine (62).

The movable valve 23 is disk-shaped and has a hollow portion. The diameter of the hollow portion is smaller than the outer diameter of the partitioning member 41 and the outer diameter of the partition wall 17. The movable valve 23 is capable of sliding axially between the partition member 41 and the partition wall 17 with the inner peripheral surface of the cylinder 15 serving as a guide surface.

The movable valve 23 is pressurized by a pressure difference between the heat transfer chamber 21 and the mechanical pump chamber 32 when an arc is generated as shown in Fig. 2 and the gas pressure in the arc space 31 rises. As a result, the movable valve 23 is displaced near the mechanical pump chamber 32 to close the communication portion 18.

3, when the shutoff operation proceeds and the pressure in the mechanical pump chamber 32 rises, the pressure difference between the heat pump chamber 21 and the mechanical pump chamber 32 causes the movable valve 23 are pressed and displaced in the direction of the partitioning member 41. The movable valve 23 is caught by the stopper 63 provided on the inner surface of the cylinder 15 before it contacts the partitioning member 41. In this embodiment, Therefore, the movable valve 23 does not contact the partition member 41, but holds the opening 54 with a space therebetween.

The movable valve 23 serves as a check valve for sealing the opening between the heat transfer chamber and the machine funnel chamber when the high current is shut off and the low temperature low pressure And serves as a switching valve for leading the gaseous gas to the inner peripheral side space of the partitioning member.

Hereinafter, the operation at the time of the large current interruption will be described. As shown in Fig. 1, when the hollow rod 16 is driven by the operation device during current interruption, the movable arc contact 11, the mover cover 13, the insulating nozzle 14, the cylinder 15, 17 are displaced toward the left side of the paper surface, and the open state is established. At this time, an arc is generated in the arc space 31 formed between the movable arc contact 11 and the fixed arc contact 12.

As the current increases to the crest value (wave height value) at the time of the large current interruption, the gas of the small gas existing in the arc space 31 becomes high temperature together with the pressure rise. As shown in FIG. 2, this low-temperature gas flows into the heat transfer chamber 21 at a high speed through the communication portion 22.

2, the switching valve 42 in the heat pump chamber 21 is moved in the leftward direction along the partitioning member 41 under the dynamic pressure of the inflowing alumina gas, Is pressed against the sealing member (43). At this time, the flow path 51 between the partitioning member 41 and the sealing member 43 is closed, and at the same time, the opening 53 at the end of the insulating nozzle 14 side is opened. As a result, the high-temperature, low-pressure gas flowing into the heat pump chamber 21 at a high speed does not flow into the inner space 61 of the partition member 41, , And into the outer peripheral side space (62) of the heat transfer chamber (21) divided by the partitioning member (41).

As a result, the thermal energy of the arc is introduced into the heat transfer chamber 21, and the gaseous gas in the heat transfer chamber 21 is heated, so that the pressure in the heat transfer chamber 21 rises rapidly. At this time, a pressure difference is generated between the heat transfer chamber 21 and the mechanical pump chamber 32, and a pressing force in the direction of the mechanical pump chamber 32 acts on the movable valve 23, thereby closing the communication portion 18.

On the other hand, the relatively low-temperature exothermic gas existing in the thermal perforation chamber 21 rather than the closed state is caused by the high-temperature exothermic gas which has flowed into the outer peripheral side space 62 of the heat transfer chamber 21, Flows into the inner circumferential space 61 of the heat transfer chamber 21 through the space between the movable valve 41 and the movable valve 23 as indicated by an arrow.

3, when the current zero point approaches, the arc shrinks and the pressure in the arc space 31 decreases, and the pressure in the space on the side of the communication portion 22 of the switching valve 42 also drops. The switching valve 42 is pressed by the pressure difference between the combustion chamber 22 side and the heat purge chamber 21 side of the switching valve 42 And operates to the communication section 22 side. The flow path 51 between the sealing member 43 and the partitioning member 41 and the flow path 52 between the sealing member 43 and the switching valve 42 are formed. The relatively low-temperature, low-temperature gas compressed at the side of the machine funnel 32 flows through the flow paths 51 and 52 from the heat transfer chamber 21 through the communicating portion 22 as shown by an arrow.

As described above, since the low-temperature gas to be injected into the arc has a relatively low temperature, the arc cooling effect becomes high, and a high breaking performance can be obtained at the time of a large current interruption. Further, it is possible to surely switch the flow path of the low-pressure gas with only one switching valve 42, and it is possible to realize a structure with high operational stability with a simple structure.

The switching plate 42 used to block the flow path 51 between the partitioning member 41 and the sealing member 43 is arranged so as to guide the small gas as shown in Figs. 5 (a) to 5 (c) It is preferable to have a smooth guide surface shape. The switching valve 42 shown in Fig. 5 (a) has the inner circumferential surface 42a as a conical smooth guiding surface. The switching valve 42 shown in Fig. 5 (b) has the inner circumferential surface 42a as a conical smooth guiding surface.

Since these cross sectional shapes serve to guide the gaseous gas, it is possible to efficiently introduce the gaseous gas into the outer peripheral side space 62 of the partition member 41. The dimensions of each side or the curvature of the arcuate portion can be appropriately changed.

5 (a) and 5 (b), an example of the changeover valve shown in Fig. 5 (c) is a configuration in which the face 42b in contact with the sealing member 43 and the partition plate 41 And the inner circumferential surface 42a has a smooth circular guide surface shape as shown in Fig. 5 (b). By selecting this shape, the switching valve 42 can be smoothly operated even when the central axis of the switching valve 42 is inclined with respect to the central axis of the hollow rod 16. The dimensions of each side or the curvature of the curved portion can be appropriately changed.

The switching valve 42 and the sealing member 43 are connected to each other by a return spring (not shown) having a weak spring pressure that does not damage the flow of the small gas and the switching valve 42 and the sealing member 43 It is possible to adopt a structure in which it is in close contact. In this case, it is possible to reduce the intrusion of the small-scale gas introduced into the inner space 61 during the current interruption, and to more reliably introduce the small-sized gas into the outer space 62.

Next, the operation at the time of the interruption of the small current will be described. In the case of the small current interruption, the pressure of the heat transfer chamber 21 and the pressure of the machine transfer chamber 32 are balanced because the pressure rise of the heat transfer chamber 21 is not as large as the large current interruption. Therefore, the movable valve 23 does not block the communicating portion 18 as shown in Fig. In the vicinity of the current zero point, the pressure of the heat transfer chamber 21 becomes lower than the pressure of the mechanical pump chamber 32 because the mechanical pump chamber 32 is compressed and the pressure rises by the interruption operation.

3, the movable valve 23 operates in the direction of the partition member 41 and low-temperature, low-pressure gas flows into the heat transfer chamber 21 from the mechanical pump chamber 32 as indicated by the arrow . Since the gap between the movable valve 23 and the partitioning member 41 is small, the exothermic gas introduced from the mechanical pump chamber 32 into the heat transfer chamber 21 as shown by the arrows flows outwardly from the outer periphery of the partitioning member 41 And does not substantially flow into the side space 62.

Since the pressure in the arc space 31 is lowered in the vicinity of the current zero point, the pressure difference between the heat transfer chamber 21 side of the switching valve 42 and the communication portion 22 side causes the switching valve 42 Is operated to operate toward the communication portion 22 side. This makes it possible to inject the low-temperature, low-pressure gas in the mechanical pump chamber 32 into the arc through the inner space 61 and the communicating portion 22 of the partitioning member 41 as a passage.

In addition, by providing a space between the movable valve 23 and the partition member 41, the gaseous gas staying in the outer peripheral side space 62 is introduced into the inner peripheral side space 61, It becomes possible to inject the gaseous gas into the arc.

The partition wall 17, the movable valve 23, the shut-off valve 42 and the sealing member 43 are formed to have a curvature at their corners and reduce the fluid resistance, It is possible to more efficiently spray the arc.

Other examples of the gas flow control means used in the gas circuit breaker of the present invention are shown in Figs. 4 (a) and 4 (b). In this example, a cutout is made on the inner circumferential side of the end portion of the partitioning member 41 closer to the insulating nozzle 14 on the side of the communicating portion 22, and the switch valve 42 ). 4 (a), the sealing member 43 is disposed between the switching valve 42 and the inner wall in the central axial direction of the partitioning member 41 partitioning the inside of the heat transfer chamber 21 Arrange to block the flow path. As a result, when the switching valve 42 is engaged with the end of the cutout portion on the side of the mechanical pump chamber 32, the substantially circular inner hollow surface of the switching valve 42 and the substantially circular sealing member (43) face each other to be in a closed state.

Fig. 4 (a) is an enlarged view showing the vicinity of the gas flow control means when the small gas flows into the heat transfer chamber 21. Fig. At this time, the switching valve 42 operates on the side opposite to the communication portion 22, and the surface on the outer diameter side of the sealing member 43 and the hollow inner diameter side surface of the switching valve 42 are opposed to each other. As a result, the flow path between the switching valve 42 and the sealing member 43 is closed and the opening 53 is opened at the time of introducing the small gas.

On the other hand, Fig. 4 (b) shows an enlarged view of the vicinity of the gas flow control means at the time of the small gas injection. When the switching valve 42 is displaced toward the communicating portion 22 as described above, the flow passage 51 is formed between the partitioning member 41, the switching valve 42, and the sealing member 43 to be in the open state.

1 to 3, when the gas flow control means shown in Figs. 4 (a) and 4 (b) is used, the changeover valve 42 and the sealing member 43 in the axial direction It is possible to reduce the fluid resistance and to spray the arc gas more efficiently into the arc.

It is preferable to use the switching valve having the shape shown in Figs. 5 (a) and 5 (b) as the switching valve 42 of the gas flow control means. By using these, it is possible to efficiently introduce the gaseous gas into the outer peripheral side space 62 of the partitioning member 41.

[Example 2]

Another embodiment of the shut-off portion of the gas circuit breaker of the present invention is shown in Fig. In this embodiment, in the first embodiment, when the movable valve 23 is in the open state, the end face of the partitioning member 41 on the side of the movable valve 23 and the mechanical pump chamber 21 comes into close contact with each other, The outer peripheral side space 62 of the heat pump chamber 21 is divided from the inner peripheral side space 61.

The pressure of the mechanical pump chamber 32 and the pressure of the heat transfer chamber 21 are balanced because the rise of the pressure of the heat transfer chamber 21 is not as large as that of the large current shutoff. Therefore, the movable valve 23 does not block the communicating portion 18.

In the vicinity of the current zero point, the mechanical pump chamber 32 is compressed by the shutoff operation. As a result, the pressure in the mechanical pump chamber 32 rises and the pressure in the heat pump chamber 21 becomes lower than the pressure in the mechanical pump chamber 32. Therefore, the movable valve 23 is pressed to move in the direction of the partitioning valve 41 and the low-temperature, low-pressure gas flows from the mechanical funnel 32 through the communication portion 18 formed in the partition wall 17, (21).

The flow path between the outer circumferential side space 62 and the inner circumferential side space 61 of the partitioning member 41 is made to be in the range of Is closed. The small gas introduced from the machine funnel 32 does not flow into the outer circumferential space 62 of the heat transfer chamber 21 divided by the partition member 41 but flows into the inner circumferential space 61, Respectively.

The gas flow path in the outer circumferential side space 62 and the inner circumferential side space 61 of the heat transfer chamber 21 divided by the partitioning member 41 is closed so that the gas staying in the outer circumferential side space 62 flows into the inner circumferential side space It is possible to prevent inflow into the side space 61. The liquefied gas in the outer peripheral side space 62 of the thermal perforation 21 is high in temperature as compared with the liquefied gas flowing in from the mechanical per chamber 32. Therefore, it is possible to inject the small gas introduced from the mechanical pump chamber 32 into the arc at a low temperature by preventing the mixing of the small gas in the outer side space 62. Therefore, according to the present embodiment, it is possible to obtain a high breaking performance even in the case of a small current interruption.

[Example 3]

Fig. 7 shows another embodiment of the breaking portion of the gas circuit breaker of the present invention. This embodiment is different from the first embodiment in that a polymer material such as tetrafluoroethylene resin having an ablation effect is formed in the outer peripheral side space 62 in the heat transfer chamber 21 divided by the partitioning member 41 71).

By doing so, the high-temperature, low-pressure gas introduced into the heat transfer chamber 21 from the arc space 31 can be brought into direct contact with the polymer material, and the pressure can be increased efficiently to obtain higher breaking performance .

The gas circuit breaker of the present invention is not limited to the above-described configuration, and can be applied to other configurations.

Claims (6)

A fixed arc contact, a movable arc contact capable of mating with the fixed arc contact, an insulation nozzle surrounding the fixed arc contact and the movable arc contact, An arc space formed between the arc contacts in the insulating nozzle when the stationary arc contactor and the movable arc contact are opened, and a heat pump chamber for introducing a soot gas having a pressure increased by the arc heat in the arc space, And a mechanical funnel chamber provided in series with the heat pump chamber for increasing the pressure by mechanical compression, and a partition wall having a communicating portion formed between the heat pump chamber and the mechanical pump chamber, A partitioning member for partitioning the inside of the casing into the outer peripheral side space and the inner peripheral side space by dividing the inside thereof in the radial direction, Wherein when the pressure of the arc space rises, an inner circumferential surface of the inner circumferential surface of the heat pump chamber is pressed against the inner circumferential surface of the inner circumferential surface of the heat pump chamber, Closing the side space and opening the side of the insulating nozzle, and when the pressure of the arc space is lowered, a gas flow for opening the inner circumference side space of the heat transfer chamber and closing the insulating nozzle side end portion The control means is provided and the communicating portion of the partition wall is closed when the pressure of the arc space rises so as to communicate with the outer circumferential side space and the inner circumferential side space of the thermal perforator chamber, And a movable valve for opening a passage to the inner circumferential side space of the heat pump chamber is disposed. A gas breaker. The method according to claim 1,
Characterized in that the gas flow control means is constituted by a switching valve having a surface closing the opening of the insulating nozzle side end portion and a surface closing the space on the inner peripheral side of the heat transfer chamber and sliding along the inner peripheral surface of the partitioning member . 3. The method of claim 2,
Wherein the switching valve has a surface on the side of the insulating nozzle side formed on a smooth guiding surface of the gaseous gas. The method according to claim 1,
Wherein the gas flow control means includes the partition member provided with a cutout portion on the inner circumferential side of the insulating nozzle side end portion, a switching valve that slides the cutout portion in the axial direction, And a seal member disposed in a radial direction so as to close a flow path between the valves, wherein when the switch valve is engaged with the mechanical puffer seal side end portion of the cutout portion, the hollow inner diameter side surface of the switch valve, Side faces of the gas barrier member are opposed to each other. 5. The method of claim 4,
Wherein the switching valve has a surface on the side of the insulating nozzle side formed on a smooth guiding surface of the gaseous gas. A fixed arc contact, a movable arc contact capable of mating with the fixed arc contact, an insulation nozzle surrounding the fixed arc contact and the movable arc contact, An arc space formed between the both arc contacts in the insulating nozzle when the stationary arc contactor and the movable arc contact are opened, and a heat pump room for introducing a soot gas having a pressure increased by the arc heat in the arc space, And a mechanical funnel chamber provided in series with the heat pump chamber for increasing the pressure by mechanical compression, and a partition wall having a communicating portion formed between the heat pump chamber and the mechanical pump chamber, A partitioning member for partitioning the inside of the casing into the outer peripheral side space and the inner peripheral side space by dividing the inside thereof in the radial direction, Wherein when the pressure of the arc space rises, an inner circumferential surface of the inner circumferential surface of the heat pump chamber is pressed against the inner circumferential surface of the inner circumferential surface of the heat pump chamber, Closing the side space and opening the side of the insulating nozzle, and when the pressure of the arc space is lowered, a gas flow for opening the inner circumference side space of the heat transfer chamber and closing the insulating nozzle side end portion The control means is provided and the communicating portion of the partition wall is closed when the pressure of the arc space rises so as to communicate with the outer circumferential side space and the inner circumferential side space of the thermal perforator chamber, A movable valve for opening a passage to the inner circumferential side space of the thermal perforation chamber is disposed, Gas circuit breaker, characterized in that configured in the space, by installing a polymeric material having an ablation effect.

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