阅读说明：本技术 机械式低气压闭锁装置及柱上断路器 (Mechanical low-pressure locking device and pole-mounted circuit breaker ) 是由 魏义利 禹锦绣 芦咏萍 申庆雷 孟宪乐 康凯 任璐 岳禹州 丰宇庭 于 2019-10-09 设计创作，主要内容包括：本发明涉及一种机械式低气压闭锁装置及柱上断路器。低气压闭锁装置,包括可伸缩的闭锁轴和机械式闭锁指示装置,闭锁轴在其伸缩行程上具有闭锁位和解锁位；机械式闭锁指示装置包括闭锁指示器、指示器复位弹簧和转轴限位臂；闭锁指示器固定在设置到断路器主体上的转动轴上,闭锁指示器在转动行程上具有闭锁指示位和隐藏位；转轴限位臂连接在转动轴上在转动行程上具有释放位和挡止位；指示器复位弹簧用于对转动轴施加弹性复位力。本低气压闭锁装置中的闭锁指示器采用机械报警的方式,结构简单、故障率低,利于运维人员查找发生闭锁的闭锁装置所对应的断路器,以及时处理并消除线路故障隐患。(The invention relates to a mechanical low-pressure locking device and a pole-mounted circuit breaker. The low-air-pressure locking device comprises a telescopic locking shaft and a mechanical locking indicating device, wherein the locking shaft is provided with a locking position and an unlocking position on the telescopic stroke of the locking shaft; the mechanical locking indicating device comprises a locking indicator, an indicator return spring and a rotating shaft limiting arm; the locking indicator is fixed on a rotating shaft arranged on the circuit breaker main body, and the locking indicator is provided with a locking indicating position and a hiding position on a rotating stroke; the rotating shaft limiting arm is connected to the rotating shaft and is provided with a release position and a stop position on a rotating stroke; the indicator return spring is used for applying elastic return force to the rotating shaft. The locking indicator in the low-pressure locking device adopts a mechanical alarm mode, has simple structure and low fault rate, is beneficial to operation and maintenance personnel to search the circuit breaker corresponding to the locking device which is locked, and timely processes and eliminates the hidden trouble of line faults.)

1. The low-pressure locking device comprises a telescopic locking shaft, wherein the locking shaft is provided with a locking position and an unlocking position on the telescopic stroke of the locking shaft; the method is characterized in that: the mechanical locking indicating device comprises a locking indicator and a rotating shaft limiting arm;

a latching indicator fixed on the rotating shaft and rotating together with the rotating shaft, the corresponding rotating shaft being used for being arranged on the circuit breaker main body of the circuit breaker on the column in a manner of being parallel to the latching shaft and corresponding to one end of the latching shaft, the rotating shaft having a protruding section protruding out of the cavity wall of the corresponding cavity of the circuit breaker main body of the circuit breaker on the column;

the locking indicator is provided with a locking indicating position extending out of the circuit breaker main body of the circuit breaker on the column and a hidden position hidden in the circuit breaker main body on a rotation stroke, and the locking indicator is arranged on the extending section of the rotating shaft;

the rotating shaft limiting arm is connected to the rotating shaft to rotate synchronously with the locking indicator; the rotating shaft limiting arm is provided with a release position corresponding to the locking indication position of the locking indicator and a stop position corresponding to the hidden position of the locking indicator on the rotating stroke, and is arranged on the part, corresponding to the inner part of the cavity, of the circuit breaker main body of the circuit breaker on the column, and used for being assembled on the rotating shaft;

the low-pressure locking device further comprises an indicator return spring, the indicator return spring is used for applying elastic return force to the rotating shaft, the elastic return force is used for enabling the rotating shaft limiting arm in the stopping position to be stopped on the outer peripheral surface of the locking shaft in the locking position, and the rotating shaft limiting arm passes through the end face of the corresponding end of the locking shaft to move to the releasing position when the locking shaft is in the unlocking position.

2. The low pressure latch of claim 1, wherein: the low-pressure locking device further comprises a rotating shaft mounting sleeve, and the rotating shaft mounting sleeve is used for enabling the rotating shaft to be arranged on the cavity wall of the corresponding cavity of the circuit breaker main body of the pole-mounted circuit breaker in a mode of rotating around the axis of the rotating shaft.

3. The low pressure latch of claim 2, wherein: and a sealing structure is arranged between the rotating shaft mounting sleeve and the cavity wall of the corresponding cavity of the breaker main body of the corresponding on-column breaker.

4. The low pressure latch of claim 2, wherein: the rotating shaft installation sleeve is axially divided into a sleeve body part and a blocking platform part, an external thread section is arranged on the sleeve body part, the external thread section is connected with a nut matched with the nut, and the nut and the blocking platform part are used for clamping the flange edge of the circuit breaker main body of the circuit breaker on the column to fix the rotating shaft installation sleeve.

5. The pole-mounted circuit breaker comprises a circuit breaker main body and a low-pressure locking device,

the circuit breaker body comprises a flange edge positioned at the lower part of the circuit breaker body;

the low-pressure locking device comprises a telescopic locking shaft, and the locking shaft is provided with a locking position and an unlocking position on the telescopic stroke of the locking shaft;

the method is characterized in that: the mechanical locking indicating device comprises a locking indicator and a rotating shaft limiting arm;

a latching indicator fixed on the rotating shaft and rotating together with the rotating shaft, the corresponding rotating shaft is arranged on the circuit breaker main body of the circuit breaker on the column in a mode of being parallel to the latching shaft and corresponds to one end of the latching shaft, and the rotating shaft is provided with a protruding section which extends out of the cavity wall of the corresponding cavity of the circuit breaker main body of the circuit breaker on the column;

the locking indicator is provided with a locking indicating position extending out of the circuit breaker main body of the circuit breaker on the column and a hidden position hidden in the circuit breaker main body on a rotation stroke, and the locking indicator is arranged on the extending section of the rotating shaft;

the rotating shaft limiting arm is connected to the rotating shaft to rotate synchronously with the locking indicator; the rotating shaft limiting arm is provided with a release position corresponding to the locking indication position of the locking indicator and a stop position corresponding to the hidden position of the locking indicator on the rotating stroke, and is arranged on the part, corresponding to the inner part of the cavity, of the circuit breaker main body of the circuit breaker on the column, and used for being assembled on the rotating shaft;

the low-pressure locking device further comprises an indicator return spring, the indicator return spring is used for applying elastic return force to the rotating shaft, the elastic return force is used for enabling the rotating shaft limiting arm in the stopping position to be stopped on the outer peripheral surface of the locking shaft in the locking position, and the rotating shaft limiting arm passes through the end face of the corresponding end of the locking shaft to move to the releasing position when the locking shaft is in the unlocking position.

6. The pole top circuit breaker of claim 5, wherein: the low-pressure blocking device further comprises a rotating shaft mounting sleeve, and the rotating shaft mounting sleeve is used for enabling the rotating shaft to be arranged on the cavity wall of the corresponding cavity of the circuit breaker main body of the pole-mounted circuit breaker in a mode of rotating around the axis of the rotating shaft.

7. The pole top circuit breaker of claim 6, wherein: and sealing structures are arranged between the rotating shaft mounting sleeve and the cavity wall of the corresponding cavity and between the rotating shaft mounting sleeve and the rotating shaft.

8. The pole top circuit breaker of claim 6, wherein: the rotating shaft installation sleeve is axially divided into a sleeve body part and a blocking platform part, an external thread section is arranged on the sleeve body part, the external thread section is connected with a nut matched with the nut, and the nut and the blocking platform part are used for clamping the flange edge of the circuit breaker main body of the circuit breaker on the column to fix the rotating shaft installation sleeve.

9. The pole top circuit breaker of claim 8, wherein: the breaker main part encloses the fender including the horizontal baffle parallel with the flange face and the vertical baffle of connection between horizontal baffle and flange limit including setting up the fender that encloses in the flange face outside on flange limit, encloses the fender and includes and dodge the mouth on the vertical baffle, dodges the mouth and is used for dodging the rotation stroke of shutting indicator.

Technical Field

The invention relates to a mechanical low-pressure locking device and a pole-mounted circuit breaker.

Background

Most of pole-mounted switch equipment for running of 10kV outdoor lines in distribution networks in China adopt sulfur hexafluoride gas as an arc extinguishing or insulating medium, sulfur hexafluoride gas is easy to leak due to poor sealing performance of switches, so that the switches are subjected to interphase and ground breakdown, power supply reliability is reduced, the switches can not be normally switched off due to the leakage of the sulfur hexafluoride gas, and great potential safety hazards are generated to personnel or equipment if load current cannot be normally switched off during line or equipment maintenance. Therefore, it is necessary to monitor the sulfur hexafluoride gas pressure change in the switch body.

The application publication number is CN109830399A, and the application publication date is 2019, 05 and 31, Chinese invention patent application discloses a low-pressure locking device and a sulfur hexafluoride switch using the same. The sulfur hexafluoride switch further comprises a locking shaft, the locking shaft is provided with a locking position used for limiting the rotation of the switch driving shaft and an unlocking position used for avoiding the switch driving shaft, a first pressure spring used for applying force for converting the locking shaft into the locking position to the locking shaft is arranged on the switch body, and a telescopic shaft used for blocking the locking shaft and keeping the locking shaft in the unlocking position is arranged on the switch body. The sulfur hexafluoride switch is characterized in that the switch body is provided with an air chamber used for filling sulfur hexafluoride gas, the air chamber is connected with a corrugated pipe in a sealing mode, one end, away from the air chamber, of the corrugated pipe is provided with a sealing plate, one end, away from the locking shaft, of the telescopic shaft is fixed to the sealing plate, a second pressure spring is arranged in an annular space between the telescopic shaft and the corrugated pipe, one end of the second pressure spring is fixed to the base, the other end of the second pressure spring is fixed to the sealing plate. When the air pressure in the air chamber meets the requirement, the balance point of the pressure of the air pressure on the baffle and the thrust of the second pressure spring enables the telescopic shaft to stop the locking shaft at the unlocking position, and the switch driving shaft can rotate freely to realize the switching-on and switching-off operation of the sulfur hexafluoride switch. When the air pressure in the air chamber is lower than the set pressure, the balance point of the pressure of the air pressure on the baffle and the thrust of the second pressure spring moves outwards, so that the telescopic shaft releases the blocking of the locking shaft, the locking shaft is converted into a locking position under the action of the first pressure spring, the locking device is locked, the switch driving shaft cannot rotate, and at the moment, the sulfur hexafluoride switch cannot perform opening and closing operations and trigger the micro switch to act.

The sulfur hexafluoride switch adopts a microswitch to send out an alarm signal when the locking shaft is in the locking position, and the alarm signal is processed by a matched controller and then fed back to a background or related operation and maintenance personnel. However, when the electric alarm device or the matched controller has a fault, operation and maintenance personnel cannot conveniently find the circuit breaker corresponding to the locking device which is locked, and the circuit breaker is not favorable for timely processing and eliminating the hidden trouble of line fault.

Disclosure of Invention

The invention aims to provide a low-pressure locking device, which is used for solving the problems that in the prior art, operation and maintenance personnel cannot conveniently search a circuit breaker corresponding to the locking device which is locked, and the problem that the hidden trouble of a line fault cannot be handled and eliminated in time.

In order to achieve the purpose, the technical scheme of the low-pressure locking device is as follows: the low-pressure locking device comprises a telescopic locking shaft, and the locking shaft is provided with a locking position and an unlocking position on the telescopic stroke of the locking shaft;

the mechanical locking indicating device comprises a locking indicator and a rotating shaft limiting arm;

a latching indicator fixed on the rotating shaft and rotating together with the rotating shaft, the corresponding rotating shaft being used for being arranged on the circuit breaker main body of the circuit breaker on the column in a manner of being parallel to the latching shaft and corresponding to one end of the latching shaft, the rotating shaft having a protruding section protruding out of the cavity wall of the corresponding cavity of the circuit breaker main body of the circuit breaker on the column;

the locking indicator is provided with a locking indicating position extending out of the circuit breaker main body of the circuit breaker on the column and a hidden position hidden in the circuit breaker main body on a rotation stroke, and the locking indicator is arranged on the extending section of the rotating shaft;

the rotating shaft limiting arm is connected to the rotating shaft to rotate synchronously with the locking indicator; the rotating shaft limiting arm is provided with a release position corresponding to the locking indication position of the locking indicator and a stop position corresponding to the hidden position of the locking indicator on the rotating stroke, and is arranged on the part, corresponding to the inner part of the cavity, of the circuit breaker main body of the circuit breaker on the column, and used for being assembled on the rotating shaft;

the low-pressure locking device further comprises an indicator return spring, the indicator return spring is used for applying elastic return force to the rotating shaft, the elastic return force is used for enabling the rotating shaft limiting arm in the stopping position to be stopped on the outer peripheral surface of the locking shaft in the locking position, and the rotating shaft limiting arm passes through the end face of the corresponding end of the locking shaft to move to the releasing position when the locking shaft is in the unlocking position.

The low-pressure locking device has the beneficial effects that: the indicator reset spring applies elastic reset force to the rotating shaft, when the locking shaft is in an unlocking position, the outer peripheral surface of the locking shaft stops the rotating shaft limiting arm, so that the rotating shaft limiting arm cannot rotate under the action of the elastic reset force, namely, the locking shaft in the unlocking position stops the rotating shaft limiting arm in the stopping position, when the locking shaft is converted from the unlocking position to the locking position, the locking shaft in the locking position is enabled to stop the rotating shaft limiting arm, the rotating shaft limiting arm passes through the end surface of the lower end of the locking shaft and rotates to the releasing position, when the rotating shaft limiting arm rotates from the stopping position to the releasing position, the locking indicator correspondingly rotates from the hiding position to the locking indicating position to prompt an operation and maintenance person that a circuit breaker on the column cannot perform switching and closing operations due to too low air pressure, and compared with a mode that an alarm signal is sent out when the locking shaft is in the locking position through an electric alarm device, the locking indicator in the low-air pressure locking device adopts a mechanical alarm mode, the circuit breaker locking device has the advantages of simple structure and low fault rate, and is beneficial to operation and maintenance personnel to search the circuit breaker corresponding to the locking device which is locked, and timely process and eliminate the hidden trouble of line faults.

Further, the low-pressure locking device further comprises a rotating shaft mounting sleeve, and the rotating shaft mounting sleeve is used for enabling the rotating shaft to be arranged on the cavity wall of the corresponding cavity of the circuit breaker main body of the pole-mounted circuit breaker in a mode of rotating around the axis of the rotating shaft.

The indicating device has the advantages that the rotating shaft limiting arms and the stations of the locking indicator are respectively corresponding through the rotating shaft, and the indicating device is simple in structure.

Further, sealing structures are arranged between the rotating shaft installation sleeve and the cavity wall of the corresponding cavity and between the rotating shaft installation sleeve and the rotating shaft.

It has the advantage of preventing dust, water vapor and the like from entering the chamber.

Further, the rotating shaft installation sleeve is axially divided into a sleeve body part and a blocking platform part, an external thread section is arranged on the sleeve body part and connected with a nut matched with the external thread section, and the nut and the blocking platform part are used for clamping the flange edge of the circuit breaker main body of the circuit breaker on the column to fix the rotating shaft installation sleeve.

The novel LED lamp has the advantages of simple structure and easiness in installation.

The technical scheme of the pole-mounted circuit breaker comprises the following steps: the pole top circuit breaker includes a breaker body and a low pressure lockout device,

the circuit breaker body comprises a flange edge positioned at the lower part of the circuit breaker body;

the low-pressure locking device comprises a telescopic locking shaft, and the locking shaft is provided with a locking position and an unlocking position on the telescopic stroke of the locking shaft;

the mechanical locking indicating device comprises a locking indicator and a rotating shaft limiting arm;

a latching indicator fixed on the rotating shaft and rotating together with the rotating shaft, the corresponding rotating shaft is arranged on the circuit breaker main body of the circuit breaker on the column in a mode of being parallel to the latching shaft and corresponds to one end of the latching shaft, and the rotating shaft is provided with a protruding section which extends out of the cavity wall of the corresponding cavity of the circuit breaker main body of the circuit breaker on the column;

the locking indicator is provided with a locking indicating position extending out of the circuit breaker main body of the circuit breaker on the column and a hidden position hidden in the circuit breaker main body on a rotation stroke, and the locking indicator is arranged on the extending section of the rotating shaft;

the rotating shaft limiting arm is connected to the rotating shaft to rotate synchronously with the locking indicator; the rotating shaft limiting arm is provided with a release position corresponding to the locking indication position of the locking indicator and a stop position corresponding to the hidden position of the locking indicator on the rotating stroke, and is arranged on the part, corresponding to the inner part of the cavity, of the circuit breaker main body of the circuit breaker on the column, and used for being assembled on the rotating shaft;

the low-pressure locking device further comprises an indicator return spring, the indicator return spring is used for applying elastic return force to the rotating shaft, the elastic return force is used for enabling the rotating shaft limiting arm in the stopping position to be stopped on the outer peripheral surface of the locking shaft in the locking position, and the rotating shaft limiting arm passes through the end face of the corresponding end of the locking shaft to move to the releasing position when the locking shaft is in the unlocking position.

The pole-mounted circuit breaker has the beneficial effects that: the indicator reset spring applies elastic reset force to the rotating shaft, when the locking shaft is in an unlocking position, the outer peripheral surface of the locking shaft stops the rotating shaft limiting arm, so that the rotating shaft limiting arm cannot rotate under the action of the elastic reset force, namely, the locking shaft in the unlocking position stops the rotating shaft limiting arm in the stopping position, when the locking shaft is converted from the unlocking position to the locking position, the locking shaft in the locking position is enabled to stop the rotating shaft limiting arm, the rotating shaft limiting arm passes through the end surface of the lower end of the locking shaft and rotates to the releasing position, when the rotating shaft limiting arm rotates from the stopping position to the releasing position, the locking indicator correspondingly rotates from the hiding position to the locking indicating position to prompt an operation and maintenance person that a circuit breaker on the column cannot perform switching and closing operations due to too low air pressure, and compared with a mode that an alarm signal is sent out when the locking shaft is in the locking position through an electric alarm device, the locking indicator in the low-air pressure locking device adopts a mechanical alarm mode, the circuit breaker locking device has the advantages of simple structure and low fault rate, and is beneficial to operation and maintenance personnel to search the circuit breaker corresponding to the locking device which is locked, and timely process and eliminate the hidden trouble of line faults.

Further, the low-pressure locking device further comprises a rotating shaft mounting sleeve, and the rotating shaft mounting sleeve is used for enabling the rotating shaft to be arranged on the cavity wall of the corresponding cavity of the circuit breaker main body of the pole-mounted circuit breaker in a mode of rotating around the axis of the rotating shaft.

The indicating device has the advantages that the rotating shaft limiting arms and the stations of the locking indicator are respectively corresponding through the rotating shaft, and the indicating device is simple in structure.

Further, sealing structures are arranged between the rotating shaft installation sleeve and the cavity wall of the corresponding cavity and between the rotating shaft installation sleeve and the rotating shaft.

It has the advantage of preventing dust, water vapor and the like from entering the chamber.

Further, the rotating shaft installation sleeve is axially divided into a sleeve body part and a blocking platform part, an external thread section is arranged on the sleeve body part and connected with a nut matched with the external thread section, and the nut and the blocking platform part are used for clamping the flange edge of the circuit breaker main body of the circuit breaker on the column to fix the rotating shaft installation sleeve.

The novel LED lamp has the advantages of simple structure and easiness in installation.

Further, the breaker main part encloses the fender including the horizontal baffle that is parallel with the flange face and the vertical baffle of connection between horizontal baffle and flange limit including setting up the fender that encloses in the flange face outside on flange limit, encloses the fender, is equipped with on the vertical baffle and dodges the mouth, dodges the mouth and is used for dodging the rotation stroke of shutting indicator.

The multifunctional pen has the advantage of convenience in observation.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a pole top circuit breaker of the present invention;

FIG. 2 is a schematic structural view of the mechanical low-pressure locking device of FIG. 1 (the locking shaft is in the unlocking position, and the rotation shaft limiting arm is in the stopping position);

FIG. 3 is a schematic view of the pivot shaft, locking indicator, enclosure, torsion spring and torsion fitting of FIG. 1 (with the locking indicator in a hidden position);

FIG. 4 is a schematic view of the shaft sleeve, the locking indicator and the enclosure shown in FIG. 1 (the locking indicator is in a hidden position);

FIG. 5 is a schematic view of the locking indicator and the enclosure of FIG. 1 (the locking indicator is in a locking indicating position);

FIG. 6 is a schematic view of the mechanical locking indicator of FIG. 2 taken along a diameter of the shaft 3;

in the figure: 1. the locking device comprises a locking shaft, 2, a rotating shaft limiting arm, 3, a rotating shaft, 4, a torsion fitting piece, 5, a torsion spring, 6, a nut, 7, a surrounding baffle, 71, a vertical baffle, 72, a transverse baffle, 73, an avoiding opening, 8, a rotating shaft mounting sleeve, 9, a locking indicator, 10, a telescopic shaft, 11, a base, 12, a breaker main body, 13, a mechanical low-pressure locking device, 14, a dynamic sealing ring, 15 and a static sealing ring.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

According to a specific embodiment of the pole-mounted circuit breaker, the pole-mounted circuit breaker comprises a circuit breaker main body 12 and a mechanical low-pressure locking device 13, wherein a gas chamber for filling sulfur hexafluoride gas and a switch driving device are arranged on the circuit breaker main body, corresponding opening and closing operations of the pole-mounted circuit breaker are achieved through the action of the switch driving device, a cavity is arranged on the circuit breaker main body and located on the other side of the gas chamber, a circular concave portion is formed in the vertical cavity wall of the cavity, a flange edge is arranged below the circular concave portion, and the flange edge is a part of the horizontal cavity wall of the cavity.

As shown in fig. 1 and 2, the mechanical low-pressure locking device includes a locking shaft 1, the locking shaft 1 is disposed in a circular recess, the locking shaft 1 has a locking position for limiting the operation of the switch driving device and an unlocking position for avoiding the switch driving device, when the air pressure in the air chamber is above a set value, the locking shaft 1 is kept in a retraction state, namely in the unlocking position, under the blocking of a telescopic shaft 10, so as to avoid interference on the on-off operation of the on-column circuit breaker, when the air pressure in the air chamber is below the set value, the locking shaft 1 is switched from the unlocking position to the locking position, the locking shaft 1 is blocked on the operation stroke of the switch driving device, so that the on-column circuit breaker cannot perform the on-off operation, the telescopic shaft 10 is disposed on a base 11, and the base 11 is located at the bottom of the circular recess.

As shown in fig. 3, the mechanical low-pressure locking device includes a mechanical locking indicating device under the locking shaft 1, and the mechanical locking indicating device includes a rotating shaft 3 parallel to the locking shaft 1, locking indicators 9 respectively disposed at both end portions of the rotating shaft 3 in a rotation-stopped manner, and a rotation shaft stopper arm 2. The rotating shaft 3 is rotatably arranged on a flange edge of the breaker main body through a rotating shaft mounting sleeve 8, the rotating shaft mounting sleeve 8 is axially divided into a sleeve body part and a blocking platform part, an external thread section is arranged on the sleeve body part, a nut 6 is in threaded connection with the external thread section, and the nut 6 and the blocking platform part are clamped on the flange edge of the breaker main body to fix the rotating shaft mounting sleeve 8. A static sealing ring 15 is arranged between the bearing mounting sleeve 8 and the flange edge, a dynamic sealing ring 14 is arranged between the rotating shaft 3 and the rotating shaft mounting sleeve 8, the dynamic sealing ring 15 and the static sealing ring 14 are used for preventing substances such as water vapor and dust in the external environment from entering a cavity of the breaker main body, the static sealing ring 14 forms a sealing structure between the rotating shaft mounting sleeve 8 and the cavity wall, and the dynamic sealing ring 15 forms a sealing structure between the rotating shaft mounting sleeve 8 and the rotating shaft 3. The upper and lower both ends of axis of rotation 3 all stretch out pivot installation cover 8, and the spacing arm of pivot 2 welds the part that the pivot installation cover 8 was stretched out in axis of rotation 3 from pivot installation cover 8 top, and the setting of shutting indicator 9 is in the portion that the pivot installation cover 8 was stretched out in axis of rotation 3 from pivot installation cover 8 below, and the section is stretched out in the part that the pivot installation cover 8 was stretched out to axis of rotation 3 formation.

As shown in fig. 5 and 6, a torsion spring 5 is sleeved on the rotating shaft 3, a torsion fitting member 4 is assembled on the rotating shaft 3 at a position above the torsion spring 5, the torsion fitting member 4 comprises a transverse arm and a vertical arm which are arranged in an L shape, the transverse arm is used for being in rotation stop fit with the rotating shaft 3, the vertical arm is used for being in stop fit with one end of the torsion spring 5 along the tangential direction of the torsion spring 5, the other end of the torsion spring 5 is in stop fit on the breaker main body along the tangential direction of the torsion spring 5, and the torsion spring 5 constitutes an indicator return spring. The torsion fitting 4 can enable the rotating shaft 3 to avoid the locking shaft 1 in the axial direction and the radial direction, and interference with a manual operating mechanism of the pole-mounted circuit breaker for controlling opening and closing operations is avoided.

The rotating shaft limiting arm 2 comprises a horizontal mounting part for connecting with the rotating shaft 3, a horizontal stopping part for stopping and matching with the outer peripheral surface of the locking shaft and a vertical connecting part for connecting the horizontal mounting part and the locking shaft stopping part together, the horizontal stopping part is provided with a stopping bulge for stopping on the outer peripheral surface of the locking shaft, and the rotating shaft limiting arm 2 has a releasing position and a stopping position on a rotating stroke rotating along with the rotating shaft 3; when the rotating shaft limiting arm 2 is in the stopping position, the torsion spring 5 and the torsion fitting piece 4 are matched to apply elastic resetting force to the rotating shaft 3 to drive the rotating shaft limiting arm 2 to rotate from the stopping position to the releasing position. When the locking shaft 1 is in the unlocking position, the outer peripheral surface of the locking shaft 1 blocks the rotating shaft limiting arm 2, so that the rotating shaft limiting arm 2 cannot rotate under the action of the elastic reset force, namely, the locking shaft 1 in the unlocking position blocks the rotating shaft limiting arm 2 in the blocking position. When the air pressure in the air chamber is reduced to be below a set value, the locking shaft 1 is converted from the unlocking position to the locking position, the locking shaft 1 in the locking position moves upwards for a certain distance along the axial direction relative to the locking shaft 1 in the unlocking position, so that the locking shaft 1 in the locking position releases the stop of the rotating shaft limiting arm 2, and the rotating shaft limiting arm 2 passes through the end face of the lower end of the locking shaft 1 and rotates to the releasing position.

As shown in fig. 4, the latching indicator 9 has a latching indicating position protruding out of the circuit breaker main body of the on-pole circuit breaker and a hidden position hidden into the circuit breaker main body over a rotational stroke rotating with the rotational shaft 3; when the rotating shaft limiting arm 2 is in the stopping position, the locking indicator 9 is correspondingly in the hidden position. When the rotating shaft limiting arm 2 rotates from the blocking position to the releasing position, the locking indicator 9 correspondingly rotates from the hidden position to the locking indicating position, namely, the locking indicator 9 can indicate the position of the locking shaft 1, so that whether the on-column circuit breaker corresponding to the locking indicator 9 cannot be switched on or switched off due to too low air pressure is judged.

The breaker main part encloses fender 7 including setting up the flange face below on flange limit, encloses fender 7 and includes the horizontal baffle 72 parallel with the flange face on flange limit and connects the vertical baffle 71 between horizontal baffle 72 and flange limit, is equipped with on the vertical baffle 71 and dodges mouth 73, dodges mouth 73 and is used for dodging the rotation stroke of shutting indicator 9.

In this embodiment, exert elasticity restoring force to axis of rotation 3 through torsional spring 5 and torsion fitting piece 4, in other embodiments, can take other forms, for example, convert the torsional spring into the extension spring, the left side at the circuit breaker main part is fixed to the one end of extension spring, and the other end is fixed on the spacing arm of pivot to the suitable elasticity restoring force of direction is exerted to the spacing arm of pivot.

In this embodiment, the form that pivot installation cover 8 presss from both sides tight flange limit through keeping off platform part and nut 6 is fixed on the circuit breaker main part, and in other embodiments, the pivot installation cover can set up on the circuit breaker main part through other forms, for example, the form that the pivot installation cover adopted the bearing, the outer lane of bearing and the pore wall interference fit of the bearing via hole on the flange limit.

In this embodiment, the position of the locking indicator 9 can be conveniently determined by setting the enclosure 7, and in other embodiments, the enclosure may not be set, for example, the locking indicator is set to be in the shape of a circular disc, different color blocks are set on the circular disc, the locking indicator further includes a pointer connected with the rotation shaft in a rotation stop manner, and the pointer and the circular disc correspond to the color blocks to distinguish whether the locking indicator 9 is in a locking indication position or a hidden position.

In this embodiment, a sealing structure is provided between the rotating shaft mounting sleeve 8 and the flange edge, and a sealing structure is also provided between the rotating shaft mounting sleeve 8 and the rotating shaft 3.

The specific embodiment of the mechanical low-pressure locking device of the present invention is the same as the structure of the mechanical low-pressure locking device in the specific embodiment of the pole-mounted circuit breaker of the present invention, and thus, the detailed description thereof is omitted.