Contact accessory for stabilizing arc of gas circuit breaker and arc experiment device comprising same

Abstract

The utility model belongs to the technical field of gas circuit breakers, and relates to a contact accessory for stabilizing the arc of a gas circuit breaker and an arc experiment device comprising the same. The contact accessory comprises a rod-shaped contact and an auxiliary contact; the auxiliary contact comprises an arc striking rod and a connecting column, and a plurality of vent holes are formed in the connecting column; the gas circuit breaker comprises a connecting conductor and a gas guide pipe; one end of the connecting column is fixedly connected with the arc striking rod, and the other end of the connecting column extends into an inner hole of the connecting conductor and is connected with the connecting conductor; a counter bore is machined in the contact end of the rod-shaped contact, and when the contact is closed, the arc striking rod extends into the counter bore of the rod-shaped contact. The electric arc burns between the front end of the rod-shaped contact and the front end of the arc striking rod of the auxiliary contact in the arcing process, it is ensured that the electric arc near the nozzle throat is located on the axis, and observation is facilitated; the auxiliary contact is provided with a vent hole, a conduction path is provided for airflow, arc blowing gas is diffused to the rear portion of the air compression piston through the vent hole and the air guide pipe, and the auxiliary contact is prevented from excessively hindering gas flowing.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas circuit breakers, and particularly relates to a contact accessory for stabilizing the electric arc of a gas circuit breaker and an arc experimental device containing the contact accessory. Background Art

[0002] The important function of high voltage switchgear is to extinguish arc and cut off current. The arc extinguishing chamber structure mainly includes contacts arranged on both sides of the moving and static parts, nozzles and arc blowing chamber 6, etc. Figure 1 When the switch is on, the rod-shaped contact 1 is inserted into the self-powered contact 4 to form a reliable electrical contact. When the switch is off, the rod-shaped contact 1 is separated from the self-powered contact 4. The arc burns between the two contacts and is extinguished at the zero crossing point by the airflow from the arc blowing chamber 6.

[0003] Generally, the arc blowing gas will diffuse to the left and right sides after flowing through the fracture, one side will flow out from the nozzle, and the other side will flow out from the inner hole of the gas guide tube 9 of the contact assembly.

[0004] In order to study the characteristic parameters of the arc, the arc experimental device based on this structure needs to be Figure 1 The arc is observed at the nozzle throat position shown in the figure. However, during the arcing process, the arc root is located at a random position at the end of the self-powered contact 4 and moves around the end, causing the arc to deviate from the axis and fluctuate around the axis. Practice has shown that the observation effect is not ideal. Measures need to be taken to ensure that the arc burns stably along the axis to facilitate observation. Utility Model Content

[0005] The utility model aims to provide a contact accessory for stabilizing the arc of a gas circuit breaker and an arc test device containing the same, which solves the problem that the arc of the existing gas circuit breaker deviates from the axis and cannot burn stably along the axis.

[0006] The utility model is realized through the following technical solutions:

[0007] A contact accessory for stabilizing an arc in a gas circuit breaker, comprising a rod-shaped contact and an auxiliary contact;

[0008] The auxiliary contact includes an arc-starting rod and a connecting column, and a plurality of vent holes are processed on the connecting column;

[0009] The gas circuit breaker includes a connecting conductor and a gas guide tube;

[0010] One end of the connecting column is fixedly connected to the arc-starting rod, and the other end of the connecting column extends into the inner hole of the connecting conductor and is connected to the connecting conductor; the connecting conductor is threadedly connected to the air guide pipe;

[0011] A countersunk hole is machined at the center of the contact end of the rod-shaped contact. When the contact is closed, the arc-starting rod of the auxiliary contact extends into the countersunk hole of the rod-shaped contact.

[0012] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, a metal sheet is provided between the connecting column and the connecting conductor, and a plurality of ventilation holes are processed on the metal sheet.

[0013] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the metal sheet is made of copper-tungsten or copper-chromium alloy.

[0014] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the number of the vent holes on the metal sheet is the same as the number of the vent holes on the connecting column.

[0015] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the shape of the vent hole is set to be a crescent hole, a circular hole or an elliptical hole.

[0016] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker described in the utility model, the gas circuit breaker includes a small nozzle and a self-powered contact, the auxiliary contact is installed on the inner side of the self-powered contact, and the front end of the arc striking rod protrudes from the self-powered contact by at least 2 mm and is no longer than the end face of the small nozzle.

[0017] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the inner diameter of the countersunk hole is 3 to 5 mm larger than the outer diameter of the arc striking rod.

[0018] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker described in the present invention, an external thread is processed on the outer circumferential surface of the connecting column, an internal thread is processed on the inner hole of the connecting conductor, and the connecting column is threadedly connected to the connecting conductor.

[0019] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the arc striking rod and the connecting column are formed in one piece or connected by threads.

[0020] As a preferred solution of the contact accessory for stabilizing the arc of a gas circuit breaker according to the present invention, the extended end of the arc-starting rod is an arc surface.

[0021] On the other hand, the utility model also discloses an arc experiment device containing the contact accessory for stabilizing the arc of a gas circuit breaker.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The utility model discloses a contact accessory for stabilizing the arc of a gas circuit breaker. The utility model adds an auxiliary contact design with an arc-starting rod and an air vent located at an axial position, so that the arc root is located at the front end of the arc-starting rod, ensuring that the arc burns stably at the axial position, while not affecting the arc-blowing airflow to diffuse to both sides, achieving a technical effect that is conducive to observing the arc under the condition that the airflow direction is consistent with that of a conventional arc extinguishing chamber. Specifically, the arc is caused to burn between the front end of the rod-shaped contact and the front end of the arc-starting rod of the auxiliary contact during the arc burning process, ensuring that the arc near the nozzle throat is located on the axis, which is convenient for observation; at the same time, the auxiliary contact has an air vent, which provides a conductive path for the airflow, and the arc-blowing gas can diffuse to the rear of the air piston through the air vent and the air guide pipe, avoiding excessive obstruction of the gas flow by the auxiliary contact. The arc-starting rod of the auxiliary contact extends into the deep hole at the front end of the rod-shaped contact in the contact closing position, which will not hinder the rod-shaped contact from being inserted into the self-powered contact, and will not affect the conductive flow between the rod-shaped contact and the self-powered contact.

[0024] Furthermore, the front end of the arc-starting rod of the auxiliary contact protrudes from the end face of the self-powered contact by at least 2 mm, ensuring that the arc root is located at the front end of the arc-starting rod of the auxiliary contact after the rod-shaped contact is disengaged and will not move onto the self-powered contact.

[0025] Furthermore, a metal sheet is provided between the connecting post and the connecting conductor, and the ventilation volume per unit time can be adjusted as needed through the metal sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the arc extinguishing chamber structure of the prior art;

[0027] Figure 2 This is a schematic diagram of the arc extinguishing chamber structure of the utility model;

[0028] Figure 3 Schematic diagram of the explosion structure of the auxiliary contact and the metal sheet; Figure a shows that the arcing rod and the connecting column are integrally formed; Figure b shows that the arcing rod and the connecting column are fixed by threaded connection;

[0029] Figure 4 This is a schematic structural diagram of the arc extinguishing chamber of the present invention when the contacts are separated;

[0030] Figure 5 This is a schematic structural diagram of the arc extinguishing chamber of the present invention during arcing.

[0031] Among them, 1. Rod-shaped contact; 2. Large nozzle; 3. Small nozzle; 4. Self-powered contact; 5. Contact seat; 6. Arc blowing chamber; 7. Auxiliary contact; 8. Connecting conductor; 9. Air guide tube; 10. Air piston; 11. Metal sheet;

[0032] 71. Arc-starting rod; 72. Connecting column; 73. Vent hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0034] The components described and illustrated in the drawings and embodiments of the present invention may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. All other embodiments derived by those skilled in the art based on the drawings and embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or apparatus.

[0036] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0037] like Figure 1 As shown, the arc extinguishing chamber of a conventional gas circuit breaker includes a rod-shaped contact 1, a large nozzle 2, a small nozzle 3, a self-powered contact 4, a contact base 5, an arc blowing chamber 6, a connecting conductor 8, an air guide tube 9 and a gas piston 10.

[0038] like Figure 1 As shown, the self-powered contact 4 is threadedly connected to the outer surface of the connecting conductor 8, and the self-powered contact 4 and the contact seat 5 are firmly contacted by tightening the thread. The front end of the connecting conductor 8 is installed with an auxiliary contact 7, and the rear end is installed with an air guide tube 9. The tail end of the air guide tube 9 extends into the tubular pull rod of the air compressor piston 10 to exhaust air to the rear.

[0039] The utility model is Figure 1 The arc extinguishing chamber structure of the engineering prototype shown is used as a basis, while the basic layout of the rod-shaped contact 1, the self-powered contact 4 and the nozzle remains unchanged. An auxiliary contact 7 with an arc-strike rod 71 and a vent 73 is added, and the structure of the rod-shaped contact 1 is improved. While ensuring that the arc can burn stably on the axis, it does not affect the diffusion of the airflow to the rear of the self-powered contact 4, thereby maintaining the structural function of the two-way flow of the airflow.

[0040] like Figure 3As shown, the utility model is designed to provide a contact accessory for stabilizing the arc of a gas circuit breaker, comprising a rod-shaped contact 1 and an auxiliary contact 7; the auxiliary contact 7 comprises an arc-striking rod 71 of a certain length and a connecting column 72, the connecting column 72 being processed with a plurality of vent holes 73, the arc-striking rod 71 being fixedly connected to one end of the connecting column 72, and the other end of the connecting column 72 extending into the inner hole of the connecting conductor 8 and connected to the connecting conductor 8.

[0041] Specifically, the extended end of the arc-starting rod 71 is an arc surface.

[0042] There are generally three or four vent holes 73 .

[0043] like Figure 3 As shown in Figure a, the arc-starting rod 71 and the connecting column 72 are integrally formed, and the vent hole 73 is prefabricated in the connecting column 72 in advance.

[0044] Specifically, if Figure 3 As shown, the ventilation hole 73 is designed to be a crescent hole, a circular hole or an elliptical hole.

[0045] like Figure 3 As shown in Figure b, the arc-starting rod 71 and the connecting column 72 are connected by threads. The arc-starting rod 71 and the connecting column 72 are processed separately, and then the arc-starting rod 71 is installed into the connecting column 72.

[0046] More preferably, after installation, the arc striking rod 71 of the auxiliary contact 7 protrudes from the self-powered contact 4 by at least 2 mm and does not exceed the end surface of the small nozzle 3 at the longest.

[0047] Specifically, an external thread is processed on the outer circumferential surface of the connecting post 72 , and an internal thread is processed on the inner hole of the connecting conductor 8 , and the connecting post 72 is threadedly connected to the connecting conductor 8 .

[0048] More preferably, a metal sheet 11 is provided between the connecting post 72 and the connecting conductor 8 to adjust the airflow through the vent hole 73. By rotating the metal sheet 11, the ventilation area of the vent hole 73 changes.

[0049] Generally, the metal sheet 11 is made of copper-tungsten or copper-chromium alloy.

[0050] The front end of the rod-shaped contact 1 is processed with a countersunk hole. When the contacts are closed, the rod-shaped contact 1 is inserted into the self-powered contact 4, and the arc-starting rod 71 of the auxiliary contact 7 extends into the deep hole of the rod-shaped contact 1. Figure 2 shown.

[0051] Specifically, the inner diameter of the countersunk hole is 3 to 5 mm larger than the outer diameter of the arc-starting rod 71 , so as to ensure smooth docking and insertion without damaging the arc-starting rod 71 .

[0052] The utility model also discloses an arc test device incorporating the aforementioned contact accessory for stabilizing a gas circuit breaker arc. The arc test device comprises a test circuit breaker body and the contact accessory. The test circuit breaker body comprises an annular self-powered arc contact 4, a large nozzle 2, a small nozzle 3, a connecting conductor 8, and an air guide tube 9. Compared to the actual structure of a gas circuit breaker product, the contact end of the rod-shaped contact 1 requires modification by machining a countersink.

[0053] During the contact breaking process, the rod-shaped contact 1 and the self-powered contact 4 separate to generate an arc. Under the compression of the compressed air piston 10, the gas in the arc blowing chamber 6 flows out from the gap between the small nozzle 3 and the large nozzle 2. As the distance between the front end of the rod-shaped contact 1 and the end face of the self-powered contact 4 continues to increase, it exceeds the gap between the front end of the contact 1 and the arc striking rod 71 of the auxiliary contact 7. The arc root quickly transfers to the arc striking rod 71 of the auxiliary contact 7. Figure 4 As shown. In this way, during the arc burning process, due to the presence of the auxiliary contact 7, the arc at the nozzle throat position is always at the axis, as shown in FIG. Figure 5 As shown, it provides convenience for arc observation. Because the auxiliary contact 7 has a vent hole 73, the arc blowing gas can pass through the auxiliary contact 7 and diffuse backward along the air duct 9, ensuring the two-way flow of air and the consistency of the conventional arc extinguishing chamber.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A contact accessory for stabilizing the arc of a gas circuit breaker, characterized in that: It comprises a rod-shaped contact (1) and an auxiliary contact (7); The auxiliary contact (7) comprises an arc-starting rod (71) and a connecting column (72), and a plurality of vent holes (73) are processed on the connecting column (72); The gas circuit breaker comprises a connecting conductor (8) and a gas guide tube (9); One end of the connecting column (72) is fixedly connected to the arc-starting rod (71), and the other end of the connecting column (72) extends into the inner hole of the connecting conductor (8) and is connected to the connecting conductor (8); the connecting conductor (8) is threadedly connected to the air guide tube (9); A countersunk hole is machined at the center of the contact end of the rod-shaped contact (1); when the contact is closed, the arc-starting rod (71) of the auxiliary contact (7) extends into the countersunk hole of the rod-shaped contact (1).

2. A contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1, characterized in that: A metal sheet (11) is provided between the connecting column (72) and the connecting conductor (8), and a plurality of vent holes (73) are processed on the metal sheet (11).

3. A contact accessory for stabilizing the arc of a gas circuit breaker according to claim 2, characterized in that: The metal sheet (11) is made of copper-tungsten or copper-chromium alloy.

4. The contact accessory for stabilizing the arc of a gas circuit breaker according to claim 2, characterized in that: The number of the vent holes (73) on the metal sheet (11) is the same as the number of the vent holes (73) on the connecting column (72).

5. A contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1 or 2, characterized in that: The shape of the vent hole (73) is set to be a crescent hole, a circular hole or an elliptical hole.

6. The contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1, characterized in that: The gas circuit breaker comprises a small nozzle (3) and a self-powered contact (4), the auxiliary contact (7) being mounted on the inner side of the self-powered contact (4), the front end of the arc-starting rod (71) protruding from the self-powered contact (4) by at least 2 mm and not exceeding the end face of the small nozzle (3) at the longest.

7. The contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1, characterized in that: The inner diameter of the countersunk hole is 3 to 5 mm larger than the outer diameter of the arc-starting rod (71).

8. The contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1, characterized in that: An external thread is processed on the outer circumferential surface of the connecting column (72), an internal thread is processed on the inner hole of the connecting conductor (8), and the connecting column (72) is threadedly connected to the connecting conductor (8).

9. The contact accessory for stabilizing the arc of a gas circuit breaker according to claim 1, characterized in that: The arc-starting rod (71) and the connecting column (72) are formed in one piece, or are connected by screw threads; The extended end of the arc-starting rod (71) is an arc surface.

10. An arc testing device comprising the contact accessory for stabilizing the arc of a gas circuit breaker according to any one of claims 1 to 9.

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