Sealed high voltage direct current relay

Abstract

The present invention discloses a sealed HVDC relay, comprising an insulating hood and a yoke plate which is extended upward to form a cylindrical fixing portion; the insulating hood has an overturned cup structure; a chamber for accommodating moving contacts and stationary contacts is formed by the yoke plate and the insulating hood together; a lower end of the insulating hood and the fixing portion of the yoke plate are fitted with each other by threads; and the portion fitted by threads between the lower end of the insulating hood and the fixing portion is sealed by adhesive pouring. In the present invention, with the insulating hood made of ceramics, the stiffness of the relay structure of the present invention is promised. The absence of a brazing process makes the relay of the present invention short in manufacturing period and low in cost. With regard to the present invention, the sealing performance of the relay is promised by adhesive pouring, and a service voltage of the relay can be increased. In this way, the voltage of the relay of the present invention can reach 1000 V, thus improving the application performance of the present invention.

Claims

1. A sealed high voltage direct current (HVDC) relay, comprising an insulating hood and a yoke plate which is extended upward to form a cylindrical fixing portion; the insulating hood has an overturned cup structure; a chamber for accommodating moving contacts and stationary contacts is formed by the yoke plate and the insulating hood together; a lower end of the insulating hood and the fixing portion of the yoke plate are fitted with each other by threads; and the portion fitted by threads between the lower end of the insulating hood and the fixing portion is sealed by adhesive pouring, characterized in that an external thread portion is formed at a lower end of the insulating hood, and an internal thread portion is formed at the fixing portion; the internal thread portion has a thread height less than that of the external thread portion; the insulating hood and the fixing portion of the yoke plate are fitted by threads so that external threads are exposed from the insulating hood at a position corresponding to the upper side of the fixing portion.

2. The sealed HVDC relay according to claim 1, characterized in that a magnetic circuit system is provided below the yoke plate, and the magnetic circuit system is arranged inside a cylindrical yoke cup having a wall extended upward above an upper end surface of the fixing portion of the yoke plate; a lower end surface of the insulating hood is resisted against the yoke plate; and a first adhesive pouring cavity is formed between the wall of the yoke cup and the insulating hood, and a sealing adhesive is filled inside the first adhesive pouring cavity.

3. A sealed high voltage direct current (HVDC) relay, comprising an insulating hood and a yoke plate which is extended upward to form a cylindrical fixing portion; the insulating hood has an overturned cup structure; a chamber for accommodating moving contacts and stationary contacts is formed by the yoke plate and the insulating hood together; a lower end of the insulating hood and the fixing portion of the yoke plate are fitted with each other by threads; and the portion fitted by threads between the lower end of the insulating hood and the fixing portion is sealed by adhesive pouring, characterized in that an external thread portion is formed at a lower end of the insulating hood, and an internal thread portion is formed at the fixing portion; a magnetic circuit system is provided below the yoke plate, and the magnetic circuit system is arranged inside a cylindrical yoke cup having a wall extended upward above an upper end surface of the fixing portion of the yoke plate; a lower end surface of the insulating hood is resisted against the yoke plate; and a first adhesive pouring cavity is formed between the wall of the yoke cup and the insulating hood, and a sealing adhesive is filled inside the first adhesive pouring cavity.

4. The sealed HVDC relay according to claim 3, characterized in that the insulating hood, the yoke plate and the yoke cup are all arranged inside a shell; the shell has a cylindrical structure; the top of the shell is fixed with an upper cover which is located above the insulating hood; a leading-out end comprises an upper section, a middle section and a lower section; stationary contacts are fixed with the lower section of the leading-out end, the middle section of the leading-out end is fixed with the insulating hood, and the upper section of the leading-out end passes through the insulating hood and the upper cover so as to be extended to an outer side of the upper cover; a first through hole for an upper end of the leading-out end to pass through is formed on the upper cover; an adhesive pouring hole is formed on the upper cover; and a second adhesive pouring cavity is formed between the upper cover and the insulating hood, and an sealing adhesive is filled inside the second adhesive pouring cavity.

5. The sealed HVDC relay according to claim 4, characterized in that the first adhesive pouring cavity and the second adhesive pouring cavity are communicated.

6. The sealed HVDC relay according to claim 4, characterized in that a diameter of the first through hole is greater than an external diameter of the leading-out end; and a gap between the upper section of the leading-out end and the upper cover is the adhesive pouring hole.

7. The sealed HVDC relay according to claim 4, characterized in that the wall of the yoke cup comprises an upper cup wall portion and a lower cup wall portion; an external diameter of the upper cup wall portion is greater than that of the lower cup wall portion; a lip structure is formed on a wall of the shell; and a lower edge of the upper cup wall portion is resisted against the lip structure.

8. The sealed HVDC relay according to claim 7, characterized in that an internal diameter of the upper cup wall portion of the yoke cup is greater than that of the lower cup wall portion; and the lower end surface of the yoke plate is resisted against the upper edge of the lower cup wall portion.

9. The sealed HVDC relay according to claim 4, characterized in that a plurality of positioning bosses extending downward are formed at an outer edge of the lower end surface of the upper cover; the plurality of positioning bosses are evenly arranged at intervals in an annular shape; and the positioning bosses are resisted against an inner side of the wall of the shell.

10. The sealed HVDC relay according to claim 4, characterized in that the insulating hood is made of ceramics; there are external threads on the lower side of the middle section of the leading-out end; a first threaded through hole fitted with the middle section of the leading-out end is formed on the top of the insulating hood; the first threaded through hole of the insulating hood and the external threads of the external thread portion are integrally shaped when the insulating hood is sintered.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic sectional view of the present invention after the adhesive pouring process;

(2) FIG. 2 is a top view of the present invention;

(3) FIG. 3 is a schematic sectional view of the present invention before the adhesive pouring process;

(4) FIG. 4 is a schematic structure diagram of an insulating hood according to the present invention;

(5) FIG. 5 is a schematic structure diagram of a yoke plate according to the present invention;

(6) FIG. 6 is a schematic structure diagram of a yoke cup according to the present invention;

(7) FIG. 7 is a schematic structure diagram of an upper cover according to the present invention; and

(8) FIG. 8 is an enlarged view of part A of FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

(9) As shown in FIG. 1, FIG. 3, FIG. 4 and FIG. 5, the present invention provides a sealed HVDC relay, comprising an insulating hood 1 and a yoke plate 2; the insulating hood 1 has an overturned cup structure, an outer edge of the yoke plate 2 is extended upward to form a cylindrical fixing portion 11, and a lower end of the insulating hood 1 and the fixing portion 11 of the yoke plate 2 are fitted and fixed with each other by threads; the insulating hood 1 and the yoke plate 2 are fixed by threads, and a chamber for accommodating a moving contact assembly and a stationary contact assembly is formed by the insulating hood 1 and the yoke plate 2; and the portion fitted by threads between the lower end of the insulating hood and the fixing portion is sealed by pouring a sealing adhesive 8.

(10) An internal thread portion 12 is formed at the fixing portion 11, and an external thread portion 13 fitted with the internal thread portion 12 is formed at a lower end of the insulating hood 1. A chamber for accommodating a moving contact assembly and a stationary assembly is formed by fixing the insulating hood 1 and the yoke plate 2 by threads; the moving contact assembly comprises a moving reed 3 and moving contacts; and the stationary contact assembly comprises stationary contacts and a leading-out end 4 which is fixed with the top of the insulating hood 1. A leading-out end 4 comprises an upper section, a middle section and a lower section. Stationary contacts are fixed with the lower section of the leading-out end, external threads are formed on the middle section of the leading-out end, and a second threaded through hole 44 fitted with the middle section of the leading-out end is formed on the insulating hood 1. The threaded structure of the second threaded through hole of the insulating hood 1 and the external thread portion 12 at the lower end of the insulating hood 1 are integrally molded when the insulating hood is sintered, and the insulating hood is made of ceramics. The second threaded through hole and the external thread portion of the insulating hood are formed as follows: inserting a bolt before a ceramic body of the insulating hood is made, obtaining the ceramic body with an external thread portion by molding; unscrewing the bolt after the body is formed; and sintering the ceramic body to obtain an insulating hood having a second threaded through hole and an external thread portion. Such a method has simpler manufacturing process and lower cost than machining threads on a ceramic cover, and also has lower cost than brazing the leading-out end and the insulating hood. Wherein, as the leading-out end and the insulating hood are fixed by threaded connection, the connection strength between the leading-out end and the insulating hood can be enhanced; and the thickness of the insulating hood made of ceramics can be reduced while ensuring the connection strength between the leading-out end and the insulating hood, and the manufacturing cost of the present invention is thus reduced.

(11) The external thread portion 13 has a thread height greater than that of the internal thread portion 12; the insulating hood 1 and the fixing portion 11 of the yoke plate 2 are fitted by threads, so that external threads are exposed from the insulating hood 1 at a position corresponding to an upper side of the fixing portion 11; and a first adhesive pouring cavity 17 is formed between a wall of the yoke cup and the external threads exposed from the insulating hood. A magnetic circuit system 5 is provided below the yoke plate 2, and the magnetic circuit system 5 is arranged inside a cylindrical yoke cup 6 having a wall extended upward above an upper end surface of the fixing portion 11 of the yoke plate 2; the insulating hood 1 is fixed with the yoke plate 2 by threads, and a lower end surface of the insulating hood 1 is resisted against an upper end surface of the yoke plate 2.

(12) As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 7, the insulating hood 1, the yoke plate 2 and the yoke cup 6 are all arranged inside a shell 10; the shell 10 has a cylindrical structure; and the top of the shell 10 is fixed with an upper cover 9 which is located above the insulating hood 1. An upper section of the leading-out end 4 passes through the insulating hood 1 and the upper cover 9 to be extended to an outer side of the upper cover 9; and a first through hole 14 for the upper section of the leading-out end 4 to pass through is formed on the upper cover 9. An adhesive pouring hole 15 is formed on the upper cover 9; a second adhesive pouring cavity 18 is formed between the upper cover 9 and the insulating hood 1; the first adhesive pouring cavity 17 and the second adhesive pouring cavity 18 are communicated; and the sealing adhesive 8 is filled inside both the first adhesive pouring cavity 17 and the second adhesive pouring cavity 18.

(13) As shown in FIG. 1, FIG. 2 and FIG. 3, a diameter of the first through hole 14 of the upper cover 9 is greater than an external diameter of the upper section of the leading-out end 4; and a gap between the upper section of the leading-out end 4 and the upper cover 9 is the adhesive pouring hole 15. The adhesive is filled from the adhesive filling hole 15; the sealing adhesive flows along the gap between the shell 10 and the insulating hood 1 to the first adhesive pouring cavity 17 and enters the gap between the external thread portion and the internal thread portion (the gap between the insulating hood and the fixing portion of the yoke plate) along the external threads exposed from the insulating hood, so as to seal the portion fitted by threads between the insulating hood and the yoke plate; gaps between the first adhesive pouring cavity 17, the shell and the insulating hood are successively filled by the sealing adhesive; then the sealing adhesive is filled into the second adhesive pouring cavity 18 so as to seal the position where the leading-out end and an outer surface of the insulating hood contact; when the second adhesive pouring cavity 18 is filled with the sealing adhesive, the sealing adhesive overflows the adhesive pouring hole or the sealing adhesive is located inside the adhesive pouring hole, and the whole adhesive pouring operation is thus completed.

(14) As shown in FIG. 1, FIG. 3, FIG. 6 and FIG. 8, the wall of the yoke cup 6 comprises an upper cup wall portion 20 and a lower cup wall portion 21; an external diameter of the upper cup wall portion 20 is greater than that of the lower cup wall portion 21; a lip structure 22 is formed on a wall of the shell 10; and a lower edge of the upper cup wall portion 20 is resisted against the lip structure 22. An internal diameter of the upper cup wall portion 20 of the yoke cup 6 is greater than that of the lower cup wall portion 21; and the lower end surface of the yoke plate 2 is resisted against the upper edge of the lower cup wall portion 21. This arrangement can prevent the sealing adhesive from entering the magnetic circuit system and reduce loss from a sealing adhesive pouring process.

(15) As shown in FIG. 1, FIG. 3 and FIG. 7, two positioning bosses 16 extending downward are formed on the lower end surface of the upper cover 9; the two positioning bosses 16 are arranged on two opposite sides of the lower end surface of the upper cover 9; and the upper cover 9 and the shell 10 are fitted, so that the positioning bosses 16 are resisted against an inner side of the wall of the shell 10. This arrangement facilitates the positioning and fixing of the upper cover 9 and the shell 10.

(16) In the present invention, with the insulating hood made of ceramics, the stiffness of the relay structure of the present invention is promised. The absence of a brazing process makes the relay of the present invention short in manufacturing period and low in cost. With regard to the present invention, the sealing performance of the relay is promised by adhesive pouring, and a service voltage of the relay can be increased. In this way, the voltage of the relay of the present invention can reach 1000 V, thus improving the application performance of the present invention.