Vacuum switch tube

Abstract

The invention discloses a vacuum switch tube which comprises a grounding metal cylinder, servo electromagnetic mechanisms are arranged at the two ends of the grounding metal cylinder, a current wire outlet end is arranged on the periphery of the grounding metal cylinder, two oppositely-installed vacuum switch tube components are arranged in the grounding metal cylinder, the two vacuum switch tube components are coaxially arranged, and the static ends of the two vacuum switch tube components are connected back to back to form a whole. The static end is composed of a static end flange plate provided with an auxiliary electrode, the movable end of the vacuum switch tube component comprises a movable conducting rod, one end of the movable conducting rod is provided with a movable contact, and the other end of the movable conducting rod is connected with a servo electromagnetic mechanism through an insulating pull rod. The two vacuum switch tube components are connected in series through the static end flange plate to form paired tubes, and each vacuum switch tube component is very short and can be respectively processed, so that the manufacturing difficulty and cost of the arc quenching unit are effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage circuit breakers, and in particular to a vacuum switch tube. Background Art

[0002] As the main body of the arc-extinguishing unit of the vacuum circuit breaker, the vacuum switch tube has the advantages of safety, reliability, environmental friendliness, and strong arc-extinguishing ability, and is widely used in the power distribution system. With the implementation of the green and environmentally friendly "double carbon" strategy by the country, the arc-extinguishing units with greenhouse gas SF6 as the medium in the high-voltage circuit breakers of the transmission system of 126kV and above will be replaced within a limited time. The development of vacuum arc-extinguishing units with voltage levels above 126kV is the only choice to replace the SF6 arc-extinguishing units. The working voltage of the vacuum switch tube will enter the saturation zone of the withstand voltage / opening distance relationship curve as the opening distance increases. To further increase the working voltage, the structural size of the switch tube needs to be enlarged geometrically, which not only touches the relevant multi-physical field application limit, but more importantly, it makes the manufacturing cost of the switch tube increase sharply. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a vacuum switch tube which does not use SF6 arc extinguishing medium and can reduce the manufacturing cost of the arc extinguishing unit.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: It comprises a grounded metal cylinder, servo electromagnetic mechanisms are arranged at both ends of the grounded metal cylinder, current outlet terminals are arranged at the periphery, and two relatively installed vacuum switch tube components are arranged inside, the two vacuum switch tube components are coaxially arranged and the static ends are connected back to back to form a whole, the static end of the vacuum switch tube component is composed of a static end flange plate equipped with an auxiliary electrode, the moving end of the vacuum switch tube component is composed of a main shielding cover, a porcelain shell assembly and a moving conductive rod, the porcelain shell assembly is composed of a porcelain shell and a suspended potential shielding cover, the porcelain shell is connected to one end of the main shell, and the other end of the main shell is connected to the static end flange plate, the moving conductive rod passes through the suspended potential shielding cover and the main shielding cover in sequence, one end of the moving conductive rod is provided with a moving contact, and the other end is connected to the servo electromagnetic mechanism through an insulating pull rod, and the moving contact is coaxially arranged with the auxiliary electrode.

[0005] The opening distance of the vacuum switch tube components is 30 mm to 50 mm.

[0006] An annular heat sink is arranged on the outer wall of the main shell, and one end of the annular heat sink is connected to the static end flange plate.

[0007] A high-voltage capacitor is arranged outside the porcelain shell, and two ends of the high-voltage capacitor are respectively connected to the moving conductive rod and the main shell.

[0008] The current outlet terminal is connected to a conductive cylinder, and the conductive cylinder is in electrical contact with a movable conductive rod through sliding.

[0009] The conductive cylinder and the static end flange plate are each connected to a disc insulator, and the disc insulator is also connected to a grounding metal cylinder.

[0010] The grounded metal cylinder is filled with environmentally friendly gas.

[0011] Beneficial effects of the present invention: 1. Two vacuum switch tube components are connected in series through the static end flange plate to form a pair of tubes. The length of each vacuum switch tube component is very short and can be processed separately, which effectively reduces the difficulty and cost of manufacturing the arc extinguishing unit; 2. By installing the auxiliary electrode on the static end flange plate, the heat conduction path is shortened, and the heat generated by the auxiliary electrode is dissipated through the static end flange plate and the main shell and the external gas convection, thereby improving the heat dissipation efficiency; 3. Set the opening distance of the vacuum switch tube components in the linear growth area of ​​the working voltage curve to significantly increase the working voltage of the arc extinguishing unit; 4. The static end flange plate serves as the symmetry point of the electrical parameters of the tube. Since the main shell and the static end flange plate are connected as one body and the moving conductive rod is connected to a high-voltage capacitor, the influence of the stray capacitance to the ground can be offset; the static end flange plate serves as the mechanical base point of the arc extinguishing unit, so that the motion system forms a closed loop when closing the circuit breaker, which can offset the destructive closing momentum. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the vacuum switch tube component of the present invention; Figure 3 It is a schematic structural diagram of the combination of two vacuum switch tube components of the present invention.

[0013] Figure 4 Schematic diagram of the structure of the vacuum switch tube component in Example 3; In the figure: 1. Vacuum switch tube components; 101. Auxiliary electrode; 102. Static end flange plate; 103. Main shielding cover; 104. Porcelain shell; 105. Suspended potential shielding cover; 106. Moving conductive rod; 107. Moving contact; 108. Ring heat sink; 109. Main shell; 2. Grounding metal cylinder; 3. Servo electromagnetic mechanism; 4. Current outlet terminal; 5. Insulating pull rod; 6. High-voltage capacitor; 7. Conductive cylinder; 8. Disc insulator. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0016] like Figure 1 to Figure 2 As shown, the present invention provides a vacuum switch tube, comprising a grounded metal cylinder 2, servo electromagnetic mechanisms 3 are provided at both ends of the grounded metal cylinder 2, current outlet terminals 4 are provided at the periphery, two vacuum switch tube components 1 installed oppositely are provided inside, the two vacuum switch tube components 1 are coaxially arranged and the static ends are connected back to back to form a whole, the static end of the vacuum switch tube component 1 is composed of a static end flange plate 102 equipped with an auxiliary electrode 101, and the moving end of the vacuum switch tube component 1 is composed of a main shielding cover 103, a porcelain shell assembly and The movable conductive rod 106 is composed of a ceramic shell assembly consisting of a ceramic shell 104 and a suspended potential shielding cover 105. The ceramic shell 104 is connected to one end of the main shell 109, and the other end of the main shell 109 is connected to the static end flange plate 102. The movable conductive rod 106 passes through the suspended potential shielding cover 105 and the main shielding cover 103 in sequence. A movable contact 107 is provided at one end of the movable conductive rod 106, and the other end is connected to the servo electromagnetic mechanism 3 through an insulating pull rod 5. The movable contact 107 is coaxially arranged with the auxiliary electrode 101.

[0017] Two vacuum switch tube components 1 are connected in series to form a pair of tubes through a static end flange plate 102. The length of each vacuum switch tube component 1 is very short and can be processed separately, which effectively reduces the difficulty and cost of manufacturing the arc extinguishing unit. By installing an auxiliary electrode 101 on the static end flange plate 102, the heat conduction path is shortened, and the heat generated by the auxiliary electrode 101 is dissipated through convection between the static end flange plate 102 and the main shell 109 and the external gas, thereby improving the heat dissipation efficiency. By configuring the length of each floating potential shielding cover 105, the static capacitance value between the sealing rings of each porcelain shell 104 can be equalized to eliminate the influence of the stray capacitance in the vacuum switch tube component 1. Moreover, the static end flange plate 102 serves as the mechanical base point of the arc extinguishing unit, so that the motion system forms a closed loop when closing the switch, which can offset the destructive closing momentum.

[0018] Specifically, the opening distance of the vacuum switch tube component 1 is 30 mm to 50 mm. The opening distance of the vacuum switch tube component 1 is set in the linear growth area of ​​the working voltage curve, and then connected in series into pairs of tubes, so that the working voltage of the arc extinguishing unit is greatly improved. Compared with the single-break vacuum switch tube component, the opening distance is shorter, the insulation performance is better, and the service life is longer. Example

[0019] like Figure 1 As shown, a high-voltage capacitor 6 is provided outside the porcelain shell 104, and the two ends of the high-voltage capacitor 6 are respectively connected to the moving conductive rod 106 and the main shell 109, which can offset the influence of the stray capacitance to the ground; the current outlet terminal 4 is connected to the conductive cylinder 7, and the conductive cylinder 7 is in electrical contact with the moving conductive rod 106 through sliding. In order to prevent current leakage or short circuit, the conductive cylinder 7 and the static end flange plate 102 are respectively connected to a disc insulator 8, and the disc insulator 8 is also connected to the grounding metal cylinder 2; in order to ensure the insulation coordination of the entire arc extinguishing unit, the grounding metal cylinder 2 is filled with environmentally friendly gas. Example

[0020] like Figure 4 As shown, an annular heat sink 108 is provided on the outer wall of the main shell 109, and one end of the annular heat sink 108 is connected to the static end flange plate 102. The heat generated by the auxiliary electrode 101 is dissipated through the static end flange plate 102 and the main shielding cover 103. By adding the annular heat sink 108, the heat generated by the auxiliary electrode 101 is further transferred out, shortening the heat conduction path and improving the heat dissipation efficiency.

[0021] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A vacuum switch tube, characterized in that: The invention comprises a grounded metal cylinder (2), wherein both ends of the grounded metal cylinder (2) are provided with servo electromagnetic mechanisms (3), the periphery of the grounded metal cylinder (2) is provided with current outlet terminals (4), and two vacuum switch tube components (1) are provided inside the grounded metal cylinder, wherein the two vacuum switch tube components (1) are coaxially arranged and the static ends are connected back to back to form a whole, wherein the static end of the vacuum switch tube component (1) is composed of a static end flange plate (102) equipped with an auxiliary electrode (101), and the dynamic end of the vacuum switch tube component (1) is composed of a main shielding cover (103), a porcelain shell assembly and a dynamic conductive rod (106), wherein the vacuum switch tube component (1) is provided with ... The ceramic shell assembly is composed of a ceramic shell (104) and a suspended potential shielding cover (105); the ceramic shell (104) is connected to one end of a main shell (109); the other end of the main shell (109) is connected to a static end flange plate (102); the moving conductive rod (106) passes through the suspended potential shielding cover (105) and the main shielding cover (103) in sequence; one end of the moving conductive rod (106) is provided with a moving contact (107); the other end is connected to a servo electromagnetic mechanism (3) via an insulating pull rod (5); the moving contact (107) is coaxially arranged with an auxiliary electrode (101).

2. A vacuum switch tube according to claim 1, characterized in that: The opening distance of the vacuum switch tube component (1) is 30 mm to 50 mm.

3. A vacuum switch tube according to claim 1, characterized in that: An annular heat sink (108) is provided on the outer wall of the main housing (109), and one end of the annular heat sink (108) is connected to the static end flange plate (102).

4. A vacuum switch tube according to claim 1, characterized in that: A high-voltage capacitor (6) is provided outside the ceramic shell (104), and two ends of the high-voltage capacitor (6) are respectively connected to a moving conductive rod (106) and a main shell (109).

5. The vacuum switch tube according to claim 1, characterized in that: The current outlet terminal (4) is connected to a conductive cylinder (7), and the conductive cylinder (7) is in electrical contact with a movable conductive rod (106) through sliding.

6. A vacuum switch tube according to claim 5, characterized in that: The conductive cylinder (7) and the static end flange plate (102) are each connected to a disc insulator (8), and the disc insulator (8) is also connected to the grounding metal cylinder (2).

7. A vacuum switch tube according to claim 1, characterized in that: The grounded metal cylinder (2) is filled with environmentally friendly gas.

Images