A disconnector on-off position acquisition device and a pole-mounted circuit breaker

Abstract

The utility model discloses a kind of isolator on-off position acquisition device and pole circuit breaker, acquisition device includes the travel switch for detecting isolator on-off position, acquisition device further includes shell and transmission assembly, shell is installed on the side plate of isolator and is used to accommodate travel switch;Transmission assembly is movably arranged on shell along axial direction, one end is matched with crank of main shaft of isolator, the other end is reacted with trigger portion of travel switch, to drive trigger portion action when transmission assembly moves along axial direction;By accommodating travel switch in independently arranged shell, and combining transmission assembly and the cooperation with isolator crank arm of the guide sleeve of being threaded in shell, the reliable acquisition of isolator position state and the remote output of electrical signal are realized, the installation adaptability of acquisition device to different models isolator and the convenience of field modification are improved, and the intelligent monitoring level of distribution network equipment is significantly improved.

Description

Technical Field

[0001] This utility model relates to distribution network circuit breaker equipment, and more particularly to a disconnector switch open / close position acquisition device and a pole-mounted circuit breaker. Background Technology

[0002] Disconnect switches, as a crucial component of distribution network circuit breakers, provide visible isolation points during operation and maintenance, serving as a vital means to ensure the safe operation of equipment. With the development of distribution networks towards intelligence and automation, higher demands are placed on the remote monitoring and online sensing of the operating status of disconnect switches, particularly the reliable acquisition and output of corresponding electrical signals regarding their open / closed positions. However, current technologies often employ mechanical interlocking structures between disconnect switches and circuit breakers, typically lacking direct means of detecting the disconnect switch's position status. During operation and maintenance, manual on-site confirmation remains essential, failing to meet the demands of intelligent monitoring.

[0003] While some improvements exist, existing solutions typically involve using limit switches or other detection elements and transmitting the movement of the disconnector's operating mechanism to these elements via transmission components or direct contact to acquire the open / closed position status. Although this approach achieves position detection to some extent, it has shortcomings in practical applications: Firstly, the disconnector's operating mechanism is usually located externally to the equipment, and its structure and installation location are heavily restricted by the existing equipment, resulting in poor adaptability of the detection device due to space and structural constraints. Secondly, the detection elements and their transmission structures are susceptible to damage from wind, rain, and dust in long-term outdoor operation, negatively impacting detection accuracy and reliability. Furthermore, existing solutions often rely on simple direct triggering structures, making it difficult to simultaneously address requirements for installation flexibility, structural adaptability, and operational stability.

[0004] The aforementioned problems result in deficiencies in the reliability, adaptability, and engineering applicability of disconnector switch position signal acquisition. This not only increases the workload of maintenance personnel on-site but also hinders further improvements in the intelligent monitoring level of distribution network equipment. Utility Model Content

[0005] Purpose of this utility model: The purpose of this utility model is to provide a disconnect switch open / close position acquisition device that is flexible in installation, highly adaptable, has reliable transmission and sealing, and is well adapted to outdoor environments. Another purpose of this utility model is to provide a pole-mounted circuit breaker that includes such a disconnect switch open / close position acquisition device.

[0006] Technical Solution: The present invention discloses a disconnect switch open / close position acquisition device, comprising a limit switch for detecting the open / close position of the disconnect switch. The acquisition device further comprises a housing and a transmission assembly disposed within the housing. The housing is mounted on the side plate of the disconnect switch and is used to accommodate the limit switch. The transmission assembly is axially movably disposed on the housing, one end of which passes through the housing and extends to the outside of the housing to cooperate with a crank arm on the main shaft of the disconnect switch, and the other end is located inside the housing and interacts with the trigger part of the limit switch to drive the trigger part to actuate when the transmission assembly moves axially.

[0007] Preferably, a guide sleeve is provided on the housing near the crank arm, the transmission assembly is slidably inserted into the guide sleeve, and a sliding sealing structure is provided between the transmission assembly and the guide sleeve to prevent external debris from entering the housing; the transmission assembly is also provided with an elastic reset structure, which drives the transmission assembly to axially reset when the crank arm disengages from the transmission assembly.

[0008] Preferably, the transmission assembly includes a baffle, an adjusting rod, a guide rod, and a push plate connected in sequence. The guide rod has a stepped shaft with a diameter smaller than that of the guide rod on the side near the limit switch. The sliding cavity inside the guide sleeve is a two-section variable diameter structure, with the section near the limit switch matching the outer diameter of the stepped shaft and the section away from the limit switch matching the outer diameter of the guide rod. The outer diameter of the push plate is larger than that of the stepped shaft to limit the axial reset stroke of the transmission assembly. The elastic reset structure is a reset spring sleeved on the stepped shaft, with one end of the reset spring abutting against the end face of the guide rod and the other end abutting against the variable diameter stepped surface of the sliding cavity.

[0009] Preferably, the sliding sealing structure includes a sealing groove formed on the guide rod and a sealing ring embedded in the sealing groove, wherein the sealing ring slides and seals with the inner wall of the guide sleeve.

[0010] Preferably, the adjusting rod and the guide rod are connected by a threaded connection and are locked with a nut, so that the overall length of the transmission assembly can be adjusted by replacing the adjusting rod of different lengths when needed.

[0011] Preferably, the housing is provided with a cable outlet hole, and a waterproof connector is installed at the cable outlet hole.

[0012] Preferably, the housing is provided with an installation opening for installing a limit switch, a cover plate is provided at the installation opening, a sealing frame is provided between the cover plate and the housing, the cover plate and the housing are connected by bolts, and the housing is provided with threaded holes for fixing the bolts on the cover plate. The threaded holes are blind holes and do not communicate with the interior of the housing.

[0013] Preferably, it also includes a protective plate for shielding the adjusting rod and its nut, the protective plate being fixedly installed on the side plate of the disconnecting switch.

[0014] Preferably, the upper part of the protective plate is provided with a folded edge, and the folded edge and the housing are provided with corresponding fixing holes. The protective plate and the housing are fixed to the side plate by bolts passing through the fixing holes.

[0015] A pole-mounted circuit breaker includes a circuit breaker body and a disconnecting switch, and also includes the aforementioned disconnecting switch open / close position acquisition device.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following advantages: The present invention, by accommodating the limit switch in an independently set housing and combining it with the transmission component passing through the guide sleeve on the housing and its cooperation with the crank arm of the disconnecting switch, forms a pre-installed, sealed transmission open / close position signal acquisition module, realizing reliable acquisition of the position status of the disconnecting switch and remote output of electrical signals. This not only improves the installation adaptability of the acquisition device to different models of disconnecting switches and the convenience of on-site modification, but also solves the problem of insufficient reliability caused by the direct exposure of monitoring components to the outdoor environment in the prior art, and significantly improves the intelligent monitoring level of power distribution network equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0018] Figure 2-3 This is a three-dimensional exploded view of the final assembly of this utility model;

[0019] Figure 4 This is a partial exploded view of the present invention;

[0020] Figure 5 This is a schematic diagram of the protective shell structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the guide sleeve and some transmission components of this utility model. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0023] like Figure 1-6 As shown, a disconnector switch open / close position acquisition device and a pole-mounted circuit breaker are disclosed. The pole-mounted circuit breaker includes a circuit breaker body 6, a disconnector switch 1, and an acquisition device mounted on the disconnector switch 1. The disconnector switch 1 has a main shaft 12 and a side plate 11. A crank arm 13 is fixed on the main shaft 12, and bolts for fixing the acquisition device are provided on the side plate 11. The acquisition device is mainly used to detect the open / close position of the disconnector switch 1 and convert the position signal into an electrical signal for output to a monitoring terminal.

[0024] The data acquisition device mainly consists of a limit switch 2, a housing 3, and a transmission assembly 4 housed within the housing 3. The housing 3 is bolted to the side plate 11 of the disconnector switch 1, and its interior forms a receiving cavity to house and protect the limit switch 2. The limit switch 2 is fixed to the inner wall of the housing 3 with screws. The transmission assembly 4 is axially movably mounted on the housing 3. One end of the transmission assembly 4 passes through the housing 3 and extends to the outside of the housing 3, cooperating with the crank arm 13 on the main shaft 12 of the disconnector switch 1; the other end is located inside the housing 3 and interacts with the trigger part 22 of the limit switch 2. When the transmission assembly 4 moves axially, its end drives the trigger part 22 to actuate, thereby opening or closing the internal circuit of the limit switch 2, thus outputting a position signal.

[0025] To ensure the guiding accuracy and sealing performance of the transmission assembly 4 during sliding, a guide sleeve 31 is fixedly installed on the side of the housing 3 near the crank arm 13. The guide sleeve 31 is integrally cast with the housing 3. The transmission assembly 4 is slidably inserted into the guide sleeve 31, and a sliding sealing structure is provided between the transmission assembly 4 and the guide sleeve 31. This sliding sealing structure can effectively prevent external wind, rain, dust, and moisture in the air from entering the housing 3 through the sliding gap between the transmission assembly 4 and the guide sleeve 31, ensuring the reliability of the limit switch 2 during long-term outdoor operation. In addition, the transmission assembly 4 is also provided with an elastic reset structure. When the disconnecting switch 1 is opened and the crank arm 13 is disengaged from the transmission assembly 4, the elastic reset structure can drive the transmission assembly 4 to automatically reset along the axial direction, preparing for the next closing trigger.

[0026] The transmission assembly 4 includes a baffle 41, an adjusting rod 42, a guide rod 43, and a push plate 45 connected in sequence. The baffle 41 is located at the outermost end of the transmission assembly 4 and directly contacts the crank arm 13 on the main shaft 12 of the disconnect switch 1. One end of the adjusting rod 42 is fixedly connected to the baffle 41, and the other end is connected to the guide rod 43. The other end of the guide rod 43 is fixedly connected to the push plate 45, which faces the trigger part 22 of the limit switch 2. A stepped shaft 44 with a diameter smaller than that of the guide rod 43 is provided on the side of the guide rod 43 near the limit switch 2; that is, the diameter of the stepped shaft 44 is smaller than the main body diameter of the guide rod 43. Figure 6As shown, the sliding cavity inside the guide sleeve 31 is not a constant-diameter structure, but rather a two-section variable-diameter structure: the inner diameter of the sliding cavity closer to the limit switch 2 matches the outer diameter of the stepped shaft 44, while the inner diameter of the sliding cavity farther from the limit switch 2 matches the outer diameter of the guide rod 43. Thus, the guide rod 43 can only slide within the larger diameter section of the sliding cavity, while the stepped shaft 44 can slide simultaneously within both the smaller and larger diameter sections. Simultaneously, the outer diameter of the push plate 45 is larger than that of the stepped shaft 44. During reset, the push plate 45 abuts against the end face of the guide sleeve 31 facing the limit switch 2, thereby limiting the axial reset stroke of the transmission assembly 4 and preventing it from accidentally dislodging from the guide sleeve 31. The elastic reset structure uses a reset spring 46, which is sleeved on the stepped shaft 44. One end of the reset spring 46 abuts against the end face of the guide rod 43, i.e., the stepped surface at the connection between the guide rod 43 and the stepped shaft 44, and the other end abuts against the variable-diameter stepped surface of the sliding cavity inside the guide sleeve 31. When the crank arm 13 pushes the transmission assembly 4 into the housing 3, the return spring 46 is compressed; when the crank arm 13 disengages, the elastic force of the return spring 46 pushes the guide rod 43 and the entire transmission assembly 4 to return to their original position.

[0027] To further improve sealing performance, the aforementioned sliding sealing structure includes a sealing groove 431 formed on the outer circumference of the guide rod 43 and a sealing ring 432 embedded in the sealing groove 431. The sealing ring 432 forms a sliding sealing fit with the inner wall of the guide sleeve 31, maintaining a good sealing effect throughout the reciprocating motion of the transmission component 4, effectively preventing moisture and dust from entering the interior of the housing 3 along the sliding gap.

[0028] Considering the differences in installation dimensions among different models of disconnect switches, a detachable connection is used between the adjusting rod 42 and the guide rod 43 to ensure good adaptability of the data acquisition device. One end of the adjusting rod 42 has an external thread, and the corresponding end of the guide rod 43 has an internal thread hole. The two are connected by a threaded fit and secured with a nut 47. This allows for the replacement of adjusting rods 42 of different lengths during on-site installation, thereby adjusting the overall length of the entire transmission assembly 4 to match the position of the crank arm 13 of different disconnect switches, achieving truly pre-installed, no-modification, and rapid installation.

[0029] The housing 3 is also provided with a cable outlet 32 ​​for leading out the secondary cable of the limit switch 2. To prevent water from entering the housing along the cable, a waterproof connector 33 is installed at the cable outlet 32. In addition, to facilitate the installation and maintenance of the limit switch 2, the housing 3 is provided with an installation opening, the size of which is sufficient for the limit switch 2 to be installed or removed. A cover plate 34 is provided at the installation opening, and a sealing frame 35 is provided between the cover plate 34 and the housing 3. The cover plate 34 is fixedly connected to the housing 3 by bolts passing through the sealing frame 35. The threaded hole 36 on the housing 3 for fixing the bolts of the cover plate 34 is designed as a blind hole, that is, the threaded hole 36 does not penetrate the inner wall of the housing 3 and is not connected to the internal space of the housing 3. In this way, even if rainwater seeps in along the bolts or threaded holes, it cannot enter the interior of the housing, thereby further improving the sealing performance of the collection device.

[0030] During field use, to prevent operators from accidentally removing the nut 47 on the adjusting rod 42, which could cause changes in the length of the transmission assembly 4 or parts to fall off, the data acquisition device is also equipped with a protective plate 5. The protective plate 5 is fixedly installed on the side plate 11 of the disconnect switch 1 and at least partially covers the adjusting rod 42 and its nut 47. The upper part of the protective plate 5 is provided with a folded edge 51, and a fixing hole 52 is opened on the folded edge 51. The protective plate 5 is fixed to the side plate 11 by bolts passing through the fixing hole 52. The presence of the protective plate 5 does not affect the normal transmission operation and effectively prevents on-site misoperation.

[0031] The following describes the operation of this device using the opening and closing operation of disconnector switch 1 as an example. Figure 1 Taking the direction shown (i.e., looking perpendicularly from the outside of the side plate of the disconnector switch 1, with the axis of the main shaft 12 perpendicular to the paper) as an example, when the disconnector switch 1 rotates from the open position to the closed position, the operating mechanism drives the main shaft 12 to rotate counterclockwise, and the crank arm 13 on the main shaft 12 rotates accordingly. The crank arm 13 gradually approaches and contacts the baffle 41 at the end of the transmission assembly 4, pushing the baffle 41 to drive the entire transmission assembly 4 to move axially along the guide sleeve 31 into the housing 3. At this time, the return spring 46 sleeved on the stepped shaft 44 is compressed, and the push plate 45 at the end of the guide rod 43 moves towards the trigger part 22 of the limit switch 2. When the disconnector switch 1 is closed, the push plate 45 just compresses the trigger part 22 to its limit position, the circuit inside the limit switch 2 is in a conductive state, and the closed position signal is transmitted to the monitoring terminal through the secondary cable connected to the waterproof connector 33 to realize remote indication of the closed status.

[0032] When the disconnector switch 1 rotates from the closed position to the open position, the main shaft 12 rotates clockwise, and the crank arm 13 gradually moves away from the baffle 41. Under the elastic restoring force of the return spring 46, the guide rod 43 drives the entire transmission assembly 4 to axially reset along the guide sleeve 31 towards the outside of the housing 3, until the outer diameter end face of the push plate 45 abuts against the end face or the variable diameter step surface of the guide sleeve 31, thereby limiting further outward movement. As the push plate 45 moves away from the trigger part 22 of the limit switch 2, the trigger part 22 pops outward under its own elastic force, the internal circuit of the limit switch 2 is disconnected, and the open position signal is transmitted to the monitoring terminal through the secondary cable to realize remote indication of the open state. Through the above process, without changing the original structure of the disconnector switch 1, this device can realize reliable acquisition of the position status of the disconnector switch by simply adding a crank arm 13 to the main shaft 12, providing strong support for the intelligent online monitoring of pole-mounted circuit breakers.

Claims

1. A device for acquiring the open / closed position of a disconnecting switch, comprising a limit switch (2) for detecting the open / closed position of a disconnecting switch (1), characterized in that: The acquisition device also includes a housing (3) and a transmission assembly (4) disposed in the housing (3). The housing (3) is mounted on the side plate (11) of the disconnect switch (1) and is used to accommodate the limit switch (2). The transmission assembly (4) is axially movable on the housing (3). One end of the transmission assembly (4) passes through the housing (3) and extends to the outside of the housing (3) to cooperate with the crank arm (13) on the main shaft (12) of the disconnect switch (1). The other end is located inside the housing (3) and interacts with the trigger part (22) of the limit switch (2) to drive the trigger part (22) to move when the transmission assembly (4) moves axially.

2. The disconnector switch open / close position acquisition device according to claim 1, characterized in that: The housing (3) is provided with a guide sleeve (31) on the side near the crank arm (13). The transmission component (4) is slidably inserted into the guide sleeve (31), and a sliding sealing structure is provided between the transmission component (4) and the guide sleeve (31) to prevent external debris from entering the housing (3). The transmission component (4) is also provided with an elastic reset structure that drives the transmission component (4) to axially reset when the crank arm (13) is disengaged from the transmission component (4).

3. The disconnector switch open / close position acquisition device according to claim 2, characterized in that: The transmission assembly (4) includes a baffle (41), an adjusting rod (42), a guide rod (43), and a push plate (45) connected in sequence. The guide rod (43) has a stepped shaft (44) with a diameter smaller than that of the guide rod (43) on the side near the limit switch. The sliding cavity inside the guide sleeve (31) is a two-section variable diameter structure. The section near the limit switch (2) is adapted to the outer diameter of the stepped shaft (44), and the section away from the limit switch (2) is adapted to the outer diameter of the guide rod (43). The outer diameter of the push plate (45) is larger than that of the stepped shaft (44) to limit the axial reset stroke of the transmission assembly (4). The elastic reset structure is a reset spring (46) sleeved on the stepped shaft (44). One end of the reset spring (46) abuts against the end face of the guide rod (43), and the other end abuts against the variable diameter stepped surface of the sliding cavity.

4. The disconnect / open position acquisition device according to claim 3, characterized in that: The sliding sealing structure includes a sealing groove (431) opened on the guide rod (43) and a sealing ring (432) embedded in the sealing groove (431), wherein the sealing ring (432) slides and seals with the inner wall of the guide sleeve (31).

5. The disconnect / open position acquisition device according to claim 3, characterized in that: The adjusting rod (42) and the guide rod (43) are connected by a threaded connection and are locked with a nut (47).

6. The disconnection / open position acquisition device according to claim 1, characterized in that: The housing (3) is provided with a wire outlet hole (32), and a waterproof connector (33) is installed at the wire outlet hole (32).

7. The disconnector switch open / close position acquisition device according to claim 1, characterized in that: The housing (3) is provided with an installation opening for installing the limit switch (2). A cover plate (34) is provided at the installation opening. A sealing frame (35) is provided between the cover plate (34) and the housing (3). The cover plate (34) and the housing (3) are connected by bolts. The housing (3) is provided with a threaded hole (36) for fixing the bolt on the cover plate (34). The threaded hole (36) is a blind hole and does not communicate with the interior of the housing (3).

8. The disconnection / open position acquisition device according to claim 5, characterized in that: It also includes a guard plate (5) for shielding the adjusting rod (42) and its nut (47), the guard plate (5) being fixedly installed on the side plate (11) of the disconnecting switch (1).

9. The disconnector switch open / close position acquisition device according to claim 8, characterized in that: The upper part of the guard plate (5) is provided with a folded edge (51), and the folded edge (51) and the housing (3) are provided with corresponding fixing holes (52). The guard plate (5) and the housing (3) are fixed to the side plate (11) by bolts passing through the fixing holes (52).

10. A pole-mounted circuit breaker, comprising a circuit breaker body (6) and a disconnecting switch (1), characterized in that: It also includes a disconnector switch open / close position acquisition device as described in any one of claims 1 to 9.

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