High-voltage direct current contactor

Abstract

The high-voltage DC contactor comprises an arc extinguishing cover, a magnetic pole plate and a sleeve, the arc extinguishing cover is hermetically connected to the top of the magnetic pole plate through a connecting ring, and the sleeve is hermetically connected to the bottom of the magnetic pole plate. A closed cavity for a movable contact assembly of the high-voltage direct-current contactor to move is formed among the arc extinguishing cover, the magnetic pole plate and the sleeve; the arc extinguishing cover or the sleeve is provided with an air inflation hole communicated with the closed cavity, a sealing piece used for blocking the air inflation hole is fixed in the air inflation hole, and the sealing piece is connected with the air inflation hole in a sealed mode. According to the utility model, the sealing reliability of the inflation hole can be improved, the air leakage risk is reduced, the electrical life of a product is guaranteed, the sealing process is simple, the sealing device is more suitable for automatic production, the production efficiency is improved, and the processing cost and the material cost are also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control devices, in particular to a high-voltage direct current contactor. Background Art

[0002] In order to prevent arc burning when the moving contact and the static contact are disconnected, the mainstream practice of existing high-voltage DC contactors is to fill the high-voltage DC contactor with protective gas such as hydrogen H2, which requires the space between the moving contact and the static contact of the high-voltage DC contactor to meet a certain airtightness.

[0003] At present, the sealing structure of the existing high-voltage DC contactor is generally composed of a magnetic pole plate and a ceramic cover and a sleeve distributed on both sides of the magnetic pole plate. The three are correspondingly sealed and connected to form a closed cavity. In order to fill the closed cavity with protective gas, the existing practice is generally to provide an air filling hole leading to the closed cavity on the magnetic pole plate, and an exhaust pipe is connected to the air filling hole. The exhaust pipe and the air filling hole on the magnetic pole plate are sealed by melting the solder ring at high temperature; the external inflation device fills the closed cavity with protective gas through the exhaust pipe, and then the exhaust pipe is clamped to form a seal. Since the existing sealing method needs to ensure sealing at the connection position of the exhaust pipe and the magnetic pole plate and the jaw position of the exhaust pipe, it will increase the risk of air leakage, and the sealing process is complicated and the cost is also high. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the invention

[0004] The problem to be solved by the utility model is to provide a high-voltage DC contactor to overcome the defects of the existing high-voltage DC contactor, such as poor air tightness control of the sealing structure, high risk of air leakage, complex sealing process and high cost.

[0005] The utility model adopts the following technical solution to solve the technical problem: a high-voltage DC contactor, comprising: an arc-extinguishing hood, a magnetic pole plate and a sleeve, wherein the arc-extinguishing hood is sealed and connected to the top of the magnetic pole plate through a connecting ring, the sleeve is sealed and connected to the bottom of the magnetic pole plate, and a closed cavity for the movable contact component of the high-voltage DC contactor is formed between the arc-extinguishing hood, the magnetic pole plate and the sleeve; an inflation hole connected to the closed cavity is provided on the arc-extinguishing hood or the sleeve, a sealing member for sealing the inflation hole is fixed in the inflation hole, and the sealing member is sealed and connected to the inflation hole.

[0006] As a further improvement of the present invention, the sealing member is sealed and connected to the inflation hole by means of physical extrusion and a secondary sealing connection is performed by welding or glue dispensing technology.

[0007] As a further improvement of the utility model, the sealing element is a steel ball.

[0008] As a further improvement of the present invention, the diameter of the sealing member is larger than the diameter of the inflation hole, and the sealing member is interference fitted in the inflation hole.

[0009] As a further improvement of the present invention, the diameter of the sealing element is 2 mm to 3 mm, and the inner diameter of the inflation hole is 1 mm to 2.5 mm.

[0010] As a further improvement of the present invention, a first chamfer is provided along the edge of one end of the inflation hole away from the closed cavity.

[0011] As a further improvement of the present invention, a second chamfer is provided between the inner wall of the inflation hole and the first chamfer, and the second chamfer is smaller than the first chamfer.

[0012] As a further improvement of the utility model, the seal is arranged at one end of the inflation hole away from the closed cavity, and the seal has at least a portion protruding from the corresponding arc extinguishing cover / the sleeve, and the portion where the inflation hole contacts the seal is located on the second chamfer.

[0013] As a further improvement of the present invention, the first chamfer is 0.5 mm to 1 mm, and the second chamfer is 0.2 mm to 0.5 mm.

[0014] As a further improvement of the present invention, the moving contact assembly comprises a moving contact piece, a push rod assembly and a moving iron core, the moving contact piece is mounted on the push rod assembly and is located above the magnetic pole plate, the push rod of the push rod assembly passes through a through hole on the magnetic pole plate and is fixedly connected to the moving iron core, a static iron core located just above the moving iron core is fixed to the bottom of the magnetic pole plate, and the moving iron core and the static iron core are both accommodated in the sleeve;

[0015] The high-voltage DC contactor also includes two static contacts sealed and fixed side by side on the top of the arc extinguishing cover and a coil winding sleeved on the outside of the sleeve. The coil winding is used to drive the moving contact assembly to operate when power is turned on, so that the moving contact piece is connected with the two static contacts.

[0016] The beneficial effect of the utility model is that the utility model adopts a new idea to optimize the sealing method, by arranging the inflation hole on the arc extinguishing cover or the sleeve, by interference crimping a seal in the inflation hole, and performing a secondary sealing connection to achieve the sealing of the inflation hole. This method can improve the reliability of the sealing of the inflation hole, and only one sealing point needs to be considered, the risk of air leakage is greatly reduced, and the electrical life of the product is guaranteed; at the same time, with this structural design, the seal can be directly pressed into the inflation hole and glued to achieve sealing, the process is simple, more suitable for automated production, improves production efficiency, and reduces processing costs and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the high-voltage DC contactor of the first embodiment of the utility model after the coil winding is removed;

[0018] Figure 2 This is a cross-sectional view of the high-voltage DC contactor of Embodiment 1 of the utility model after the coil winding is removed;

[0019] Figure 3 For this utility model Figure 2 A magnified view of middle;

[0020] Figure 4 This is an exploded view of the arc extinguishing hood and the sealing member of the first embodiment of the utility model;

[0021] Figure 5 This is an exploded view of the arc extinguishing hood and the sealing member of the second embodiment of the utility model;

[0022] Figure 6 It is a cross-sectional view of the arc extinguishing cover and the sealing member of the second embodiment of the utility model.

[0023] Combined with the accompanying drawings, the following description is given:

[0024] 1. Arc extinguishing cover; 100. Inflating hole; 101. First chamfer; 102. Second chamfer; 2. Pole plate; 3. Sleeve; 4. Sealed cavity; 5. Seal; 6. Moving contact piece; 7. Push rod assembly; 8. Moving iron core; 9. Static iron core; 10. Static contact; 11. Connecting ring. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] Embodiment 1

[0027] See also Figures 1 to 4 The utility model provides a high-voltage DC contactor, comprising an arc extinguishing cover 1, a magnetic pole plate 2, a sleeve 3 and a moving contact assembly.

[0028] Optionally, the arc extinguishing hood 1 is a rectangular structure with a top but no bottom and a cavity inside, and its material can be ceramic. The bottom circle of the arc extinguishing hood 1 is sealed and welded to the top surface of the magnetic pole plate 2 through a metal connecting ring 11 to achieve sealing between the magnetic pole plate 2 and the arc extinguishing hood 1.

[0029] Optionally, the sleeve 3 is in the shape of a cup with a bottom but no top, and a horizontal flange is provided along the outer circumference of the upper end of the sleeve 3. A through hole is provided in the middle of the magnetic pole plate 2 for the moving contact component to pass through, and the sleeve 3 is sealed and welded to the bottom surface of the magnetic pole plate 2 through the flange, and the through hole of the magnetic pole plate 2 is covered, so that a closed cavity 4 for the moving contact component of the high-voltage DC contactor to move can be formed between the arc extinguishing cover 1, the magnetic pole plate 2 and the sleeve 3.

[0030] Further, such as Figure 2 As shown, the arc extinguishing hood 1 is provided with a gas filling hole 100 connected to the closed cavity 4, and the protective gas is filled into the closed cavity 4 through the gas filling hole 100. It should be noted that the position of the gas filling hole 100 on the arc extinguishing hood 1 is not limited. In this embodiment, it is specifically provided at the top of the arc extinguishing hood 1 along the vertical direction, and the upper and lower ends of the gas filling hole 100 penetrate the outer top surface and the inner top surface of the arc extinguishing hood 1.

[0031] As one of the important improvements of the present application, a sealing member 5 for sealing the inflation hole 100 is fixed inside the inflation hole 100, and the sealing member 5 is sealed and connected with the inflation hole 100 in a physical extrusion manner to achieve sealing of the inflation hole 100. The shape of the sealing member 5 includes but is not limited to a spherical shape, a semi-spherical shape, a bottle stopper shape, etc., and its material includes but is not limited to metal steel, rubber, plastic, etc.

[0032] In this embodiment, the inflation hole 100 is circular, the sealing member 5 is a steel ball, and the diameter of the sealing member 5 is larger than the diameter of the inflation hole 100 .

[0033] After the protective gas is filled into the closed cavity 4 through the filling hole 100, the seal 5 is pressed along the upper end of the filling hole 100 to the filling hole 100 of the arc extinguishing cover 1 through an external press; during the pressing process, since the diameter of the steel ball is larger than the diameter of the filling hole 100 and the hardness of the ceramic is greater than the hardness of the steel ball, the steel ball will be deformed to fit tightly against the inner wall of the filling hole 100 to form an interference connection, thereby achieving a one-time sealing of the filling hole 100.

[0034] In addition, in order to ensure the reliability of the steel ball sealing the inflation hole 100, the sealing member 5 of the present application and the inflation hole 100 are further connected by welding or dispensing technology to achieve a secondary sealing connection, and dispensing is preferred in this embodiment.

[0035] It can be seen that the utility model abandons the traditional sealing method of using the exhaust pipe jaws, and instead optimizes the sealing method with a new idea. The filling hole 100 is arranged on the arc extinguishing cover 1, and a seal 5 is press-fitted in the filling hole 100, and a secondary sealing connection is performed to achieve the sealing of the filling hole 100. This method can improve the reliability of the sealing of the filling hole 100, and only one sealing point needs to be considered, so the risk of air leakage is greatly reduced, thereby ensuring the electrical life of the product. At the same time, with this structural design, the seal 5 is directly pressed into the filling hole 100 and glue is applied to achieve sealing. The process is simple, more suitable for automated production, and thus production efficiency is improved, while processing and material costs are reduced.

[0036] In the present application, the diameter of the seal 5 is 2 mm to 3 mm, preferably 2 mm; the inner diameter of the air filling hole 100 is 1 mm to 2.5 mm, preferably 1.5 mm; the wall thickness of the arc extinguishing cover 1 is 3 mm to 4 mm, preferably 3.5 mm.

[0037] It is worth mentioning that Figure 3 and Figure 4 As shown, a first chamfer 101 is provided along the edge of one end of the filling hole 100 away from the sealed cavity 4 (ie, the upper end of the filling hole 100 ), and the first chamfer 101 is used to guide the sealing member 5 for assembly.

[0038] In the present application, the first chamfer 101 is 0.5 mm to 1 mm, preferably C0.5 mm.

[0039] The seal 5 can be completely pressed into the gas filling hole 100 along the first chamfer 101 or partially pressed into the gas filling hole 100. The latter is adopted in this embodiment. The crimped seal 5 is located at the upper end of the gas filling hole 100, and the seal 5 has at least a portion protruding from the arc extinguishing cover 1, so that the inner wall of the gas filling hole 100 and the seal 5 are in contact with the first chamfer 101 and its adjacent area. The use of this technical solution can make the diameter of the seal 5 larger than the inner diameter of the gas filling hole 100, so that the seal 5 contacts the first chamfer 101, which can increase the contact area of ​​the seal and improve the sealing effect and reliability of the seal.

[0040] Optionally, the sealing member 5 is made of high carbon chromium bearing steel.

[0041] See also Figure 2The moving contact assembly adopts the existing conventional technology and is contained in the closed cavity 4. The moving contact assembly includes a moving contact piece 6, a push rod assembly 7 and a moving iron core 8. The moving contact piece 6 is mounted on the push rod assembly 7 and is located in the arc extinguishing cover 1 above the magnetic pole plate 2. The push rod of the push rod assembly 7 passes through the through hole on the magnetic pole plate 2 and is fixedly connected to the moving iron core 8 below. A static iron core 9 is fixed to the bottom of the magnetic pole plate 2 and is located directly above the moving iron core 8. The static iron core 9 is sleeved on the outside of the push rod of the push rod assembly 7. The moving iron core 8 and the static iron core 9 are both contained in the sleeve 3.

[0042] The utility model high-voltage DC contactor also includes two stationary contacts 10 and a coil winding (not shown in the figure) which are both based on existing conventional technologies. The two stationary contacts 10 are sealed and fixed side by side on the top of the arc extinguishing cover 1, and the lower ends of the two stationary contacts 10 extend downward into the cavity of the arc extinguishing cover 1 and are arranged opposite to the moving contact piece 6 up and down.

[0043] When the coil winding is energized, the static iron core 9 and the moving iron core 8 can be magnetized. The moving iron core 8 is attracted by the static iron core 9 and moves upward, and pushes the moving contact piece 6 upward through the push rod assembly 7, so that the moving contact piece 6 is in contact with the two static contacts 10 and is turned on. When the coil winding is de-energized, the magnetic attraction between the moving iron core 8 and the static iron core 9 disappears. Under the action of the reset spring between the moving iron core 8 and the static iron core 9, the moving iron core 8 moves downward, and is disconnected from the two static contacts 10 with the moving contact piece 6 through the push rod assembly 7.

[0044] Embodiment 2

[0045] The difference between this embodiment and the first embodiment is that the structure of the air filling hole 100 at the top of the arc extinguishing cover 1 is different. Figure 5 and Figure 6 In addition to the first chamfer 101, the arc extinguishing cover 1 is also provided with a second chamfer 102 located in the filling hole 100. The second chamfer 102 is located between the inner wall of the filling hole 100 and the first chamfer 101, that is, the second chamfer 102 is connected to the lower end of the first chamfer 101, and the second chamfer 102 is smaller than the first chamfer 101.

[0046] Optionally, the size of the second chamfer 102 is 0.2 mm to 0.5 mm. In this embodiment, preferably, the second chamfer 102 is an asymmetric chamfer, and the lengths of its two right-angle sides are 0.4 mm and 0.2 mm respectively.

[0047] In this embodiment, if Figure 6As shown, the seal 5 is also not completely pressed into the filling hole 100. The crimped seal 5 is located at the upper end of the filling hole 100. The seal 5 has at least a portion protruding from the arc extinguishing cover 1, and the contact portion between the filling hole 100 and the seal 5 is located on the second chamfer 102 and its adjacent area, thereby further increasing the contact area between the seal 5 and the inner wall of the filling hole 100, further improving the sealing effect and sealing reliability, and at the same time, the second chamfer 102 can also further guide the seal 5 to be centered.

[0048] Embodiment 3

[0049] The difference between this embodiment and the first or second embodiment is that the air filling hole 100 is provided on the sleeve 3, while the arc extinguishing cover 1 in this embodiment has no air filling hole 100. Other components of the high-voltage DC contactor are the same as those in the first embodiment.

[0050] In addition, in order to ensure that the sleeve 3 has sufficient strength to support the subsequent pressing of the seal 5, the overall thickness of the sleeve 3 can be increased, or the thickness of the bottom of the sleeve 3 can be increased to meet the strength requirements. In this embodiment, the inflation hole 100 can be but is not limited to being arranged at the bottom of the sleeve 3 along the vertical direction.

[0051] After the protective gas is filled into the closed cavity 4 through the inflation hole 100 of the sleeve 3, the seal 5 is placed at the first chamfer 101 of the inflation hole 100, and the seal 5 is fixed and crimped at the inflation hole 100 of the sleeve 3 by an external press, so that the seal 5 is deformed to fit tightly to the first chamfer 101 / second chamfer 102 of the inflation hole 100 to form an interference connection, and then a secondary sealing connection is performed to achieve sealing of the inflation hole 100.

[0052] The sealing member 5 and the air filling hole 100 of the sleeve 3 are connected with each other by welding to achieve secondary sealing connection, including but not limited to soldering, laser welding, resistance welding and the like.

[0053] Optionally, the sleeve 3 is made of stainless steel.

[0054] In summary, the utility model adopts a new idea to optimize the sealing method, by arranging the inflation hole 100 on the arc extinguishing cover 1 or the sleeve 3, by interference crimping a seal 5 in the inflation hole 100, and performing a secondary sealing connection to achieve the sealing of the inflation hole 100. This method can improve the reliability of the sealing of the inflation hole 100, and only one sealing point needs to be considered, the risk of leakage is greatly reduced, and the electrical life of the product is guaranteed; at the same time, with this structural design, the seal 5 is directly pressed into the inflation hole 100 and glue is applied to achieve sealing, the process is simple, more suitable for automated production, improves production efficiency, and reduces processing costs and material costs.

[0055] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage DC contactor, comprising an arc extinguishing hood (1), a magnetic pole plate (2) and a sleeve (3), wherein the arc extinguishing hood (1) is sealedly connected to the top of the magnetic pole plate (2) through a connecting ring (11), the sleeve (3) is sealedly connected to the bottom of the magnetic pole plate (2), and a closed cavity (4) for the movable contact component of the high-voltage DC contactor to move is formed between the arc extinguishing hood (1), the magnetic pole plate (2) and the sleeve (3); characterized in that: The arc extinguishing cover (1) or the sleeve (3) is provided with an air filling hole (100) which is connected to the closed cavity (4); a sealing member (5) for sealing the air filling hole (100) is fixed in the air filling hole (100), and the sealing member (5) is sealedly connected to the air filling hole (100).

2. The high voltage DC contactor according to claim 1, characterized in that: The sealing member (5) is sealed and connected to the inflation hole (100) by means of physical extrusion and a secondary sealing connection is performed by means of welding or glue dispensing technology.

3. The high voltage DC contactor according to claim 1, characterized in that: The sealing element (5) is a steel ball.

4. The high voltage DC contactor according to claim 3, characterized in that: The diameter of the sealing member (5) is greater than the diameter of the inflation hole (100), and the sealing member (5) is interference fitted in the inflation hole (100).

5. The high voltage DC contactor according to claim 4, characterized in that: The diameter of the sealing element (5) is 2 mm to 3 mm, and the inner diameter of the inflation hole (100) is 1 mm to 2.5 mm.

6. The high voltage DC contactor according to claim 1, characterized in that: A first chamfer (101) is provided along the edge of one end of the inflation hole (100) away from the sealed cavity (4).

7. The high voltage DC contactor according to claim 6, characterized in that: A second chamfer (102) is provided between the inner wall of the inflation hole (100) and the first chamfer (101), and the second chamfer (102) is smaller than the first chamfer (101).

8. The high voltage DC contactor according to claim 7, characterized in that: The sealing member (5) is arranged at one end of the inflation hole (100) away from the closed cavity (4), and the sealing member (5) has at least a portion protruding from the corresponding arc extinguishing cover (1) / the sleeve (3), and the portion where the inflation hole (100) contacts the sealing member (5) is located on the second chamfer (102).

9. The high voltage DC contactor according to claim 8, characterized in that: The first chamfer (101) is 0.5 mm to 1 mm, and the second chamfer (102) is 0.2 mm to 0.5 mm.

10. The high voltage DC contactor according to claim 1, characterized in that: The moving contact assembly comprises a moving contact piece (6), a push rod assembly (7) and a moving iron core (8); the moving contact piece (6) is mounted on the push rod assembly (7) and is located above the magnetic pole plate (2); the push rod of the push rod assembly (7) passes through a through hole on the magnetic pole plate (2) and is fixedly connected to the moving iron core (8); a static iron core (9) located directly above the moving iron core (8) is fixed to the bottom of the magnetic pole plate (2); the moving iron core (8) and the static iron core (9) are both accommodated in the sleeve (3); The high-voltage DC contactor also includes two stationary contacts (10) sealed and fixed side by side on the top of the arc extinguishing cover (1) and a coil winding sleeved on the outside of the sleeve (3), wherein the coil winding is used to drive the moving contact assembly to operate when power is turned on, so that the moving contact piece (6) is connected to the two stationary contacts (10).

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