A contact pressure self - adaptive adjustment device and an insulating pull rod for a vacuum circuit breaker

Abstract

The present invention discloses a device for adaptively adjusting the contact pressure of a vacuum circuit breaker, which includes an elastic member. One end of the elastic member is installed at the end of an insulating pull rod far from the contact pressure spring, and the other end of the elastic member is connected to the transmission device of the circuit breaker. The present invention also discloses an insulating pull rod using the above device for adaptively adjusting the contact pressure of a vacuum circuit breaker. The purpose of the present invention is to provide a device for adaptively adjusting the contact pressure of a vacuum circuit breaker and an insulating pull rod, which can adaptively adjust and compensate the contact pressure when the static and dynamic contact pressures are abnormal, thereby effectively solving the safety hazards caused by the reduction of the contact pressure during the operation of the vacuum circuit breaker.

Description

Technical Field

[0001] The present invention relates to the field of vacuum circuit breakers, and particularly to a device and an insulating pull rod capable of adaptively adjusting the contact pressure of a vacuum circuit breaker. Background Art

[0002] In the domestic power transmission and distribution system, the theory and manufacturing technology of medium-voltage vacuum circuit breakers are becoming increasingly mature and are being applied more and more widely. However, with the increasing improvement of the domestic industrial manufacturing level and the continuous improvement of the national living standard, the reliability requirements for power transmission and distribution equipment are also getting higher and higher. Among them, the reliability of the most widely used medium-voltage vacuum circuit breakers has become the focus of attention in all walks of life.

[0003] In the closed state of a medium-voltage vacuum circuit breaker, a certain pressure is required between the moving and static contacts to ensure reliable operation. However, due to contact wear caused by electrical life or loosening of screws, etc., the contact pressure of the circuit breaker will decrease and the loop resistance will increase, thereby causing safety accidents of the circuit breaker.

[0004] In the existing vacuum circuit breaker at the closing position, the pressure between the moving and static contacts in the arc extinguishing chamber is generated by the contact pressure spring inside the insulating pull rod. As Figure 1As shown in the figure, it is a schematic structural diagram of an existing insulating pull rod. The insulating pull rod includes an insulating pull rod body 8', a first connecting shaft 7', a second connecting shaft 13', a nut 1', an insert 11' and a contact pressure spring 10'. The insulating pull rod body 8' is composed of a first insulating pull rod body 6' located on the lower side and a second insulating pull rod body 4' located on the upper side. The first insulating pull rod body 6' and the second insulating pull rod body 4' are of an integrally formed structure. A number of umbrellas 5' are machined on the outer surface of the insulating pull rod body 8'. The umbrellas 5' are annular ridges, and the main function of the umbrellas 5' is to increase the insulating creepage distance. The first connecting shaft 7' is fixedly installed at the lower end of the insulating pull rod body 8'. An insert groove 2' is machined at the upper end of the insulating pull rod body 8'. The insert 11' is installed in the insert groove 2'. A cylindrical installation groove 3' is machined at the upper end of the insert 11'. A receiving groove 9' is provided on the bottom wall of the installation groove 3'. The second connecting shaft 13' is installed in the installation groove 3'. The nut 1' is screwed to the upper end of the inner cavity of the installation groove 3'. An annular step 12' is machined on the outer surface of the upper part of the second connecting shaft 13'. The upper end of the annular step 12' abuts against the lower end face of the nut 1'. The upper end of the second connecting shaft 13' passes through the nut 1'. The lower end of the second connecting shaft 13' is located in the receiving groove 9'. A contact pressure spring 10' is sleeved on the outer surface of the second connecting shaft 13'. The lower end of the contact pressure spring 10' abuts against the bottom wall of the installation groove 3'. The upper end of the contact pressure spring 10' abuts against the lower end face of the annular step 12'. During use, the first connecting shaft 7' is connected to the transmission device of the circuit breaker, and the second connecting shaft 13' is connected to the moving rod of the vacuum interrupter. A moving contact is provided on the moving rod. In this way, when the transmission device drives the first connecting shaft 7' to move upward, the first connecting shaft 7' drives the entire insulating pull rod to move upward, that is, the second connecting shaft 13' also moves upward. Then the second connecting shaft 13' drives the moving rod of the vacuum interrupter to move upward, and the moving rod drives the moving contact connected thereto to move upward until the moving contact contacts the static contact. In order to have a certain contact pressure between the static and moving contacts, after the static and moving contacts are in contact, the transmission device drives the first connecting shaft 7' to move upward a certain distance. During this process, the first connecting shaft 7', the insulating pull rod body 8', the insert 11' and the nut 1' move upward together. At the same time, since the second connecting shaft 13' is connected to the moving contact through the moving rod, and the moving contact is blocked by the static contact and will not move upward, the second connecting shaft 13' will not move upward either. In this way, the first connecting shaft 7', the insulating pull rod body 8', the insert 11' and the nut 1' move upward relative to the second connecting shaft 13' together, resulting in the separation of the nut 1' from the upper end face of the annular step 12'. At the same time, the bottom wall of the receiving groove 9' moves close to the lower end of the second connecting shaft 13', and the contact pressure spring 10' is compressed. The compressed contact pressure spring 10' can provide the required pressure between the static and moving contacts, and closing is achieved at this time.On the contrary, when the transmission drives the first connecting shaft 7' to move downward, the first connecting shaft 7' drives the insulating pull rod body 8', the insert 11' and the nut 1' to move downward together. The compressed contact pressure spring 10' extends until the nut 1' abuts against the upper end surface of the annular step 12' again. At the same time, the bottom wall of the receiving groove 9' also moves away from the lower end of the second connecting shaft 13' to the initial state. At this time, the contact pressure spring 10' returns to the initial state. As the transmission drives the first connecting shaft 7' to continue moving downward, the entire insulating pull rod follows the first connecting shaft 7' to move downward. Then the second connecting shaft 13' moves downward, and the second connecting shaft 13' drives the moving rod of the vacuum interrupter to move downward. The moving rod drives the moving contact connected thereto to move downward, so that the moving contact is separated from the static contact, realizing the opening function.

[0005] At the time of factory shipment, the contact pressure spring 10' of the insulating pull rod has been set to the optimal state. However, during the life cycle of the circuit breaker, long-term opening and closing operations will cause contact wear, or the clearance of the circuit breaker transmission device will become larger, or the screws will become loose, all of which will cause the contact pressure to decrease, resulting in an increase in the contact resistance between the moving and static contacts, and further leading to safety accidents of the circuit breaker. At present, the mechanical characteristic parameters of the circuit breaker are regularly repaired by power station operation and maintenance personnel during power outages, with a large workload, low efficiency, and it is difficult to ensure the performance parameters of the circuit breaker, and it cannot meet the construction of modern intelligent unattended substations. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a vacuum circuit breaker contact pressure adaptive adjustment device and an insulating pull rod, which can adaptively adjust and compensate the contact pressure when the contact pressure between the moving and static contacts is abnormal, thereby effectively solving the safety hazards caused by the decrease of the contact pressure during the operation of the vacuum circuit breaker.

[0007] The vacuum circuit breaker contact pressure adaptive adjustment device in the present invention includes an elastic member, one end of the elastic member is installed at the end of the insulating pull rod away from the contact pressure spring, and the other end of the elastic member is connected to the transmission device of the circuit breaker.

[0008] The vacuum circuit breaker contact pressure adaptive adjustment device in the present invention, wherein a placement groove is provided at the end of the insulating pull rod away from the contact pressure spring, the elastic member is an adjustment spring, one end of the adjustment spring is installed in the placement groove, and the other end of the adjustment spring is connected to the first connecting shaft, and the first connecting shaft is connected to the transmission device of the circuit breaker.

[0009] The vacuum circuit breaker contact pressure adaptive adjustment device in the present invention, wherein the other end of the adjustment spring is connected to a pressure sensor, the pressure sensor is connected to the first connecting shaft, the pressure sensor is connected to a main control unit, and the main control unit is connected to a display unit.

[0010] The insulating pull rod in the present invention uses the above-mentioned contact pressure self-adaptive adjusting device of the vacuum circuit breaker.

[0011] The insulating pull rod in the present invention includes an insulating pull rod body. One end of the insulating pull rod body is provided with an insert groove. An insert is installed in the insert groove. A cylindrical installation groove is formed in the insert. A receiving groove is provided on the bottom wall of the installation groove. A second connecting shaft is arranged in the installation groove. A nut is threadedly connected to the opening of the receiving groove. One end of the second connecting shaft is located in the receiving groove, and the other end of the second connecting shaft extends out of the installation groove through the nut. An annular step is provided on the outer surface of the second connecting shaft in the installation groove, and the annular step abuts against the nut. A contact pressure spring is sleeved on the second connecting shaft in the installation groove. One end of the contact pressure spring abuts against the annular step, and the other end of the contact pressure spring abuts against the bottom wall of the installation groove. An elastic member is installed at the other end of the insulating pull rod body, and the elastic member is connected to the transmission device of the circuit breaker through a first connecting shaft.

[0012] The insulating pull rod in the present invention, wherein a placement groove is provided at the other end of the insulating pull rod body. The elastic member is an adjusting spring. One end of the adjusting spring is installed in the placement groove, and the other end of the adjusting spring is connected to the first connecting shaft. The first connecting shaft is connected to the transmission device of the circuit breaker.

[0013] The insulating pull rod in the present invention, wherein the other end of the adjusting spring is connected to a pressure sensor. The pressure sensor is connected to the first connecting shaft. The pressure sensor is connected to a main control unit. The main control unit is connected to a display unit.

[0014] The difference between the contact pressure adaptive adjustment device of the vacuum circuit breaker and the insulating pull rod of the present invention and the prior art lies in that the contact pressure adaptive adjustment device of the vacuum circuit breaker in the present invention is applied to the insulating pull rod, and the insulating pull rod is applied to the vacuum circuit breaker. That is, the first connecting shaft is connected to the transmission device of the circuit breaker, the second connecting shaft is connected to the moving rod of the vacuum interrupter, and a moving contact is provided on the moving rod. In the initial stage of the life cycle of the vacuum circuit breaker, the working pressure of the contact pressure spring meets the requirements (since the contact pressure of the circuit breaker is generated by the contact pressure spring, when the circuit breaker is in the closed state, its contact pressure also meets the requirements). When the circuit breaker is in the closed state, make the elastic pressure of the elastic member equal to the working pressure of the contact pressure spring, and both are equal to the contact pressure of the circuit breaker. Denote the elastic pressure of the elastic member, the working pressure of the contact pressure spring, and the contact pressure of the circuit breaker at this time as the first elastic pressure, the first working pressure, and the first contact pressure respectively, that is, the first elastic pressure = the first working pressure = the first contact pressure. Since the weight of the insulating pull rod is only about 1 kg, that is, its gravity is only about 10 N, while the elastic pressures of the contact pressure spring and the elastic member can reach several thousand N, the self-weight of the insulating pull rod can be ignored, that is, the elastic pressure of the elastic member can be made equal to the working pressure of the contact pressure spring when the circuit breaker is in the closed state. With the continuous use of the vacuum circuit breaker, long-term closing and opening operations will cause contact wear, or the gap of the circuit breaker transmission device becomes larger, or the screws become loose. These reasons will all cause the contact pressure to decrease, that is to say, the working pressure of the contact pressure spring decreases, that is, the contact pressure spring is not compressed to the working length. At this time, the elastic member elongates and pushes the insulating pull rod to compress the contact pressure spring, so that the working pressure of the contact pressure spring becomes larger, and then the contact pressure becomes larger and meets the requirements. The final state is that the elastic pressure of the elastic member is equal to the working pressure of the contact pressure spring again, and both are equal to the contact pressure of the circuit breaker. Denote the elastic pressure of the elastic member, the working pressure of the contact pressure spring, and the contact pressure of the circuit breaker at this time as the second elastic pressure, the second working pressure, and the second contact pressure respectively, that is, the second elastic pressure = the second working pressure = the second contact pressure. The second elastic pressure / the second working pressure / the second contact pressure < the first elastic pressure / the first working pressure / the first contact pressure. Since the required value of the contact pressure of the circuit breaker is within a range interval, the required value of the working pressure of the contact pressure spring is also within the above range interval. The above first working pressure and second working pressure are both within the range interval of the required value of the working pressure of the contact pressure spring. Thus, it can be seen that when the contact pressure of the circuit breaker is abnormal, the elastic member will automatically adjust the contact pressure to the specified range in the way of stroke compensation to achieve the purpose of stabilizing the contact pressure, thereby effectively solving the safety hazards caused by the reduction of the contact pressure during the operation of the vacuum circuit breaker.

[0015] The present invention will be further described below with reference to the accompanying drawings. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an insulating pull rod in the prior art;

[0017] Figure 2 is a schematic diagram of the vacuum circuit breaker contact pressure adaptive adjustment device of the present invention used on the insulating pull rod (which is also the schematic structural diagram of the insulating pull rod of the present invention);

[0018] Figure 3 is an external view of the vacuum circuit breaker using the present invention;

[0019] Figure 4 is a schematic internal structure of the vacuum circuit breaker using the present invention Figure 1 ;

[0020] Figure 5 is Figure 4 a partial enlarged view of part A in;

[0021] Figure 6 is a schematic internal structure of the vacuum circuit breaker using the present invention Figure 2 . Detailed Embodiment

[0022] As Figure 2 shown and in combination with Figures 3 - 6 shown, the vacuum circuit breaker contact pressure adaptive adjustment device of the present invention includes an elastic member, one end of the elastic member is installed at one end of the insulating pull rod away from the contact pressure spring 10, and the other end of the elastic member is connected to the transmission device 20 of the circuit breaker.

[0023] In the vacuum circuit breaker contact pressure adaptive adjustment device of the present invention, a placement groove 14 is provided at one end (i.e., the lower end) of the insulating pull rod away from the contact pressure spring 10. The elastic member is an adjustment spring 15. One end (i.e., the upper end) of the adjustment spring 15 is installed in the placement groove 14, and the upper end of the adjustment spring 15 abuts against the bottom wall of the placement groove 14. The other end (i.e., the lower end) of the adjustment spring 15 is connected to the first connecting shaft 7, and the first connecting shaft 7 is connected to the transmission device 20 of the circuit breaker.

[0024] The installation groove 3 where the contact pressure spring 10 is located and the placement groove 14 where the adjustment spring 15 is located are separated from each other and are not connected. The upper end of the adjustment spring 15 and the bottom wall of the placement groove 14 can be in an abutting relationship as described above, and of course, the two can also be in a fixed connection relationship.

[0025] The vacuum circuit breaker contact pressure adaptive adjustment device in the present invention, wherein the other end of the adjustment spring 15 is fixedly connected to the pressure sensor 16, and the pressure sensor 16 is fixedly connected to the first connecting shaft 7, that is, the other end of the adjustment spring 15 is connected to the first connecting shaft 7 through the pressure sensor 16. The pressure sensor 16 is electrically connected to the main control unit 18, and the main control unit 18 is electrically connected to the display unit.

[0026] The insulating pull rod in the present invention uses the above-mentioned vacuum circuit breaker contact pressure adaptive adjustment device.

[0027] This embodiment also gives the specific structure of an insulating pull rod using the vacuum circuit breaker contact pressure adaptive adjustment device, as described below.

[0028] As Figures 2 - 6 shown, the insulating pull rod in the present invention includes an insulating pull rod body 8. One end (i.e., the upper end) of the insulating pull rod body 8 is provided with an insert groove 2. An insert 11 is installed in the insert groove 2. A cylindrical installation groove 3 is provided on the insert 11. A receiving groove 9 is provided on the bottom wall of the installation groove 3. A second connecting shaft 13 is provided in the installation groove 3. A nut 1 is threadedly connected to the mouth of the receiving groove 9. One end (i.e., the lower end) of the second connecting shaft 13 is located in the receiving groove 9, and the other end (i.e., the upper end) of the second connecting shaft 13 extends outside the nut 1 through the nut 1. An annular step 12 is provided on the outer surface of the second connecting shaft 13 in the installation groove 3, and the annular step 12 abuts against the nut 1. A contact pressure spring 10 is sleeved on the second connecting shaft 13 in the installation groove 3. One end (i.e., the upper end) of the contact pressure spring 10 abuts against the annular step 12, and the other end (i.e., the lower end) of the contact pressure spring 10 abuts against the bottom wall of the installation groove 3. An elastic member is installed at the other end (i.e., the lower end) of the insulating pull rod body 8, and the elastic member is connected to the transmission device 20 of the circuit breaker through the first connecting shaft 7.

[0029] In the insulating pull rod of the present invention, a placement groove 14 is provided at the other end of the insulating pull rod body 8. The placement groove 14 is separated from the installation groove 3 and they are not communicated. The elastic member is an adjustment spring 15. One end (i.e., the upper end) of the adjustment spring 15 is installed in the placement groove 14, and the upper end of the adjustment spring 15 abuts against the bottom wall of the placement groove 14. The other end (i.e., the lower end) of the adjustment spring 15 is connected to the first connecting shaft 7, and the first connecting shaft 7 is connected to the transmission device 20 of the circuit breaker.

[0030] The upper end of the adjustment spring 15 and the bottom wall of the placement groove 14 can either abut against each other or be fixedly connected to each other.

[0031] The insulating pull rod in the present invention, wherein the other end of the adjusting spring 15 is fixedly connected to the pressure sensor 16, and the pressure sensor 16 is fixedly connected to the first connecting shaft 7, that is, the other end of the adjusting spring 15 is connected to the first connecting shaft 7 through the pressure sensor 16. The pressure sensor 16 is electrically connected to the main control unit 18, and the main control unit 18 is electrically connected to the display unit.

[0032] The insulating pull rod body 8 is composed of a first insulating pull rod body 6 located on the lower side and a second insulating pull rod body 4 located on the upper side. The first insulating pull rod body 6 and the second insulating pull rod body 4 are of an integrally formed structure. An insert groove 2 is provided on the second insulating pull rod body 4, and a placement groove 14 is provided on the first insulating pull rod body 6. A plurality of umbrellas 5 are machined on the outer surface of the insulating pull rod body 8. The umbrellas 5 are annular ridges, and the umbrellas 5 mainly play a role in increasing the insulation creepage distance.

[0033] As Figure 1 、 2 shown, through the above description, it can be known that the insulating pull rod in this embodiment is different from the existing insulating pull rod introduced in the background technology in that a vacuum circuit breaker contact pressure adaptive adjustment device is provided at the lower end of the insulating pull rod in this embodiment. That is to say, except for the adjustment device, the other structures of the insulating pull rod in this embodiment are the same as those of the existing insulating pull rod. That is, the second insulating pull rod body 4 and its internal structure in this embodiment are the same as those of the second insulating pull rod body 4' of the existing insulating pull rod and their internal structures are the same, and the working principles are also the same.

[0034] As Figure 2 、 4As shown in FIGS. 5, when the vacuum circuit breaker is closed, the transmission device 20 drives the first connecting shaft 7 to move upward. Then, the pressure sensor 16, the adjusting spring 15, the insulating rod body 8, the insert 11, the nut 1, the second connecting shaft 13 and the contact pressure spring 10 move upward together. Then, the second connecting shaft 13 drives the moving rod 21 and the moving contact 22 to move upward until the moving contact 22 contacts the static contact 23. After that, the transmission device 20 continues to drive the first connecting shaft 7 to move upward, and the pressure sensor 16 also moves upward and compresses the adjusting spring 15. Under the elastic pressure of the adjusting spring 15, the insulating rod body 8, the insert 11 and the nut 1 move upward together. Since the moving contact 22 and the static contact 23 are in contact, the second connecting shaft 13 does not move. Then, the contact pressure spring 10 is compressed (during this process, the nut 1 moves upward away from the annular step 12) until the contact pressure spring 10 reaches the working pressure, and the closing is completed. At this time, the elastic pressure of the adjusting spring 15 is made equal to the working pressure of the contact pressure spring 10. Since the weight of the insulating rod is only about 1 kg, that is, its gravity is only about 10 N, while the elastic pressures of the contact pressure spring 10 and the adjusting spring 15 can reach several thousand N, the self-weight of the insulating rod can be ignored, that is, the elastic pressure of the adjusting spring 15 can be made equal to the working pressure of the contact pressure spring 10 when the circuit breaker is closed.

[0035] When the vacuum circuit breaker is opened, the transmission device 20 drives the first connecting shaft 7 to move downward. Then, the pressure sensor 16 also moves downward, causing the adjusting spring 15 to extend, that is, the elastic pressure of the adjusting spring 15 decreases. Then, the contact pressure spring 10 extends and pushes the insulating rod body 8, the insert 11 and the nut 1 to move downward together until the nut 1 abuts against the annular step 12 again. After that, the transmission device 20 drives the first connecting shaft 7 to continue to move downward, and the pressure sensor 16 also moves downward following the first connecting shaft 7. Then, the adjusting spring 15, the insulating rod body 8, the insert 11, the nut 1, the second connecting shaft 13 and the contact pressure spring 10 move downward together. During this process, the second connecting shaft 13 drives the moving rod 21 and the moving contact 22 to move downward, and then the moving contact 22 separates from the static contact 23, and the opening is completed.

[0036] The contact pressure adaptive adjustment device in the present invention is applied to the insulating pull rod, and the insulating pull rod is further applied to the vacuum circuit breaker. That is, the first connecting shaft 7 is connected to the transmission device 20 of the circuit breaker, the second connecting shaft 13 is connected to the moving rod 21 of the vacuum interrupter, and a moving contact 22 is provided on the moving rod 21. In the initial stage of the life cycle of the vacuum circuit breaker, the working pressure of the contact pressure spring 10 meets the requirements (since the contact pressure of the circuit breaker is generated by the contact pressure spring 10, when the circuit breaker is in the closed state, its contact pressure also meets the requirements). When the circuit breaker is in the closed state, make the elastic pressure of the elastic member (i.e., the adjusting spring 15) equal to the working pressure of the contact pressure spring 10, and both are equal to the contact pressure of the circuit breaker. Denote the elastic pressure of the elastic member, the working pressure of the contact pressure spring 10, and the contact pressure of the circuit breaker at this time as the first elastic pressure, the first working pressure, and the first contact pressure respectively, that is, the first elastic pressure = the first working pressure = the first contact pressure. With the continuous use of the vacuum circuit breaker, long-term closing and opening operations will cause wear of the contacts (the moving contact 22 and the static contact 23), or the gap of the circuit breaker transmission device 20 becomes larger, or the screws become loose. These reasons will all cause the contact pressure to decrease, that is to say, the working pressure of the contact pressure spring 10 decreases, that is, the contact pressure spring 10 is not compressed to the working length. At this time, the elastic member elongates and pushes the insulating pull rod to compress the contact pressure spring 10 (specifically: the adjusting spring 15 pushes the insulating pull rod body 8, the insert 11, and the nut 1 to move upward together. During this process, the second connecting shaft 13 does not move, so the contact pressure spring 10 is compressed), so that the working pressure of the contact pressure spring 10 becomes larger, and then the contact pressure becomes larger and meets the requirements. The final state is that the elastic pressure of the elastic member is equal to the working pressure of the contact pressure spring 10 again, and both are equal to the contact pressure of the circuit breaker. Denote the elastic pressure of the elastic member, the working pressure of the contact pressure spring 10, and the contact pressure of the circuit breaker at this time as the second elastic pressure, the second working pressure, and the second contact pressure respectively, that is, the second elastic pressure = the second working pressure = the second contact pressure. The second elastic pressure / the second working pressure / the second contact pressure < the first elastic pressure / the first working pressure / the first contact pressure. Since the required value of the contact pressure of the circuit breaker is within a range interval, the required value of the working pressure of the contact pressure spring 10 is also within the above range interval. The above first working pressure and second working pressure are both within the range interval of the required value of the working pressure of the contact pressure spring 10. Thus, it can be seen that when the contact pressure of the circuit breaker is abnormal, the elastic member will automatically adjust the contact pressure to the specified range in the way of stroke compensation, so as to achieve the purpose of stabilizing the contact pressure, and effectively solve the potential safety hazards caused by the decrease of the contact pressure during the operation of the vacuum circuit breaker.

[0037] Such as Figure 4 , 6As shown, the main control unit 18 is installed on the circuit breaker panel 17. The main control unit 18 and the pressure sensor 16 are connected through a control and transmission wire 19. The main control unit 18 is connected to the display unit through a wire. When the circuit breaker is in the closed state, the pressure measured by the pressure sensor 16 is the elastic pressure of the adjusting spring 15. As described above, at this time, the elastic pressure of the adjusting spring 15 is equal to the contact pressure of the circuit breaker. That is to say, the pressure measured by the pressure sensor 16 is the contact pressure of the circuit breaker. The pressure sensor 16 transmits the measured contact pressure signal to the main control unit 18. After processing the signal, the main control unit 18 converts it into displayable data and transmits the data to the display unit for display. In this way, the display unit can display the contact pressure of the circuit breaker in real time, and the staff can judge whether the contact pressure is within the specified range according to the display result. In order to achieve intelligent control, an alarm unit can also be installed on the circuit breaker. The alarm unit is electrically connected to the main control unit 18. When the contact pressure is not within the specified range, the main control unit 18 sends an alarm signal to the alarm unit, and the alarm unit gives an alarm.

[0038] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A vacuum circuit breaker contact pressure adaptive regulating device, characterized in that: It includes an elastic member, one end of which is mounted on an end of the insulating pull rod away from the contact pressure spring, and the other end of which is connected to the transmission device of the circuit breaker. A placement groove is provided at one end of the insulating pull rod away from the contact pressure spring, and the elastic member is an adjusting spring. One end of the adjusting spring is installed in the placement groove, and one end of the adjusting spring close to the contact pressure spring is against the bottom wall of the placement groove. The other end of the adjusting spring away from the contact pressure spring is connected to the first connecting shaft, and the first connecting shaft is connected to the transmission device of the circuit breaker.

2. The vacuum circuit breaker contact pressure adaptive adjustment device according to claim 1, characterized in that: The other end of the regulating spring is connected to a pressure sensor, the pressure sensor is connected to a first connecting shaft, the pressure sensor is connected to a main control unit, and the main control unit is connected to a display unit.

3. An insulating pull rod using the vacuum circuit breaker contact pressure adaptive adjustment device according to any one of claims 1 to 2.

4. An insulating pull rod, comprising an insulating pull rod body, one end of the insulating pull rod body is provided with an insert groove, an insert is installed in the insert groove, a cylindrical installation groove is opened on the insert, a receiving groove is provided on the bottom wall of the installation groove, a second connecting shaft is provided in the installation groove, a nut is threadedly connected at the notch of the receiving groove, one end of the second connecting shaft is located in the receiving groove, the other end of the second connecting shaft passes through the nut and extends outside the installation groove, an annular step is provided on the outer surface of the second connecting shaft in the installation groove, the annular step abuts against the nut, a contact pressure spring is sleeved on the second connecting shaft in the installation groove, one end of the contact pressure spring abuts against the annular step, and the other end of the contact pressure spring abuts against the bottom wall of the installation groove, characterized in that: The other end of the insulating pull rod body is equipped with an elastic member, and the elastic member is connected to the transmission device of the circuit breaker through a first connecting shaft. The other end of the insulating pull rod body is provided with a placement groove, the elastic member is an adjustment spring, one end of the adjustment spring is installed in the placement groove, the end of the adjustment spring close to the contact pressure spring is against the bottom wall of the placement groove, the other end of the adjustment spring away from the contact pressure spring is connected to the first connecting shaft, and the first connecting shaft is connected to the transmission device of the circuit breaker.

5. The insulating pull rod according to claim 4, characterized in that: The other end of the regulating spring is connected to a pressure sensor, the pressure sensor is connected to a first connecting shaft, the pressure sensor is connected to a main control unit, and the main control unit is connected to a display unit.

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