CN114927381A

CN114927381A - Explosion-proof sealed high-voltage direct-current relay

Info

Publication number: CN114927381A
Application number: CN202111582504.5A
Authority: CN
Inventors: 钟叔明; 代文广; 黄友权; 陈松生
Original assignee: Xiamen Hongfa Electric Power Controls Co Ltd
Current assignee: Xiamen Hongfa Electric Power Controls Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-08-19

Abstract

The invention discloses an explosion-proof sealed high-voltage direct-current relay, which comprises a ceramic cover, a contact assembly, a pushing rod component, a yoke component, a protective cover and a coil, wherein the ceramic cover is arranged on the push rod component; the contact assembly and the coil are distributed up and down, and the moving and static contacts of the contact assembly are adapted in the ceramic cover with the opening arranged downwards; the yoke member encloses the coil therein; the protective cover is of a cover-shaped structure with a downward opening, and is sleeved outside the ceramic cover from top to bottom; the ceramic cover is connected with the yoke part below the ceramic cover in a sealing mode, so that the contact assembly is positioned in an inner cavity defined by the ceramic cover and the yoke part, and the inner cavity is provided with a first exhaust pipe; the yoke part is connected with the bottom of the protective cover, the yoke part and the protective cover are connected in a sealing mode through sealing glue, an outer cavity is formed among the ceramic cover, the yoke part and the protective cover, and the protective cover is provided with a second exhaust pipe. The relay has the advantages that the inner cavity and the outer cavity are formed in the relay, and different explosion-proof grades can be met by controlling the pressure of the two cavities.

Description

Explosion-proof sealed high-voltage direct-current relay

Technical Field

The invention relates to the technical field of relays, in particular to an explosion-proof sealed high-voltage direct-current relay.

Background

A relay is an electronic control device having a control system (also called an input loop) and a controlled system (also called an output loop), which is commonly used in automatic control circuits, and which is actually an "automatic switch" that uses a small current to control a large current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like. The high-voltage direct-current relay is one of relays, and a high-voltage direct-current relay in the prior art adopts a movable contact spring direct-acting type structure, namely, the closing and the opening of a movable contact and a movable contact are realized by utilizing the matching of two fixed contacts and a movable contact spring. The high-voltage direct-current relay in the prior art can seal the contact part at the upper part to realize electric-level sealing, and arc extinguishing gas is filled into the electric-level sealing cavity to play an arc extinguishing role and improve the service life performance requirement of a product. However, the high-voltage direct-current relay is not provided with an explosion-proof structure, so that the product has explosion risks under a large load; therefore, the design of a sealed high-voltage direct-current relay with an explosion-proof level is a technical problem which needs to be solved urgently. In addition, since the magnetic circuit portion at the lower portion is not sealed, when the coil is used in a high humidity environment or a more severe environment, the coil at the magnetic circuit portion is easily corroded and mildewed (for example, the coil is easily cracked by a varnish, and many pinholes exist), so that the breakdown voltage at the coil end and the insulation strength are reduced, and the reliability of the coil in use is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an explosion-proof sealed high-voltage direct-current relay, wherein an inner cavity and an outer cavity can be formed in the relay, and different explosion-proof grades can be met by controlling the pressure of the two cavities; and the coil cavity is in a sealed state independently, so that environmental-grade sealing is further achieved, the reliability of the coil used in a high-humidity environment can be improved, and the coil has the characteristics of excellent severe environment resistance, corrosion resistance, mildew resistance, improved insulating strength and good long-term reliability.

The technical scheme adopted by the invention for solving the technical problems is as follows: an explosion-proof sealed high-voltage direct-current relay comprises a ceramic cover, a contact assembly, a pushing rod component, a yoke component, a protective cover and a coil; the contact assembly and the coil are distributed up and down, and the pushing rod component is linked between the contact assembly and the coil; the moving and static contacts of the contact assembly are matched in the ceramic cover with the opening arranged downwards; the yoke member encloses the coil therein; the protective cover is arranged on the ceramic cover; the method is characterized in that: the ceramic cover is connected with the yoke part below the ceramic cover in a sealing mode, so that the contact assembly is positioned in an inner cavity surrounded by the ceramic cover and the yoke part, and the inner cavity is also provided with a first exhaust pipe used for adjusting the pressure of the inner cavity; the yoke part is connected with the bottom of the protective cover, the yoke part is connected with the protective cover in a sealing mode through sealant, an outer cavity is formed among the ceramic cover, the yoke part and the protective cover, and the protective cover is further provided with a second exhaust pipe used for adjusting the pressure of the outer cavity.

The contact assembly comprises two fixed contacts and a movable reed; the two static contacts are respectively fixed at the top wall of the ceramic cover in a brazing welding mode, the lower parts of the two static contacts respectively extend into the cavity of the ceramic cover, and the upper surfaces of the two ends of the movable spring leaf serving as a movable contact are respectively matched with the bottom ends of the two static contacts serving as static contacts; the upper end of the pushing rod component is matched with the movable spring.

The yoke iron part consists of a yoke iron plate and a yoke iron cylinder, and the yoke iron plate is positioned below the ceramic cover and connected with the ceramic cover in a sealing way; the yoke iron cylinder is provided with an upward opening, the yoke iron plates are arranged in the yoke iron cylinder, and the coil is arranged between the yoke iron plates and the cylinder bottom of the yoke iron cylinder; the upper end of the side wall of the yoke iron cylinder leans against the outer side of the bottom of the protective cover, and the sealant is distributed on the outer side of the protective cover and the outer side of the upper end of the side wall of the yoke iron cylinder in a sealing mode.

The bottom end of the ceramic cover is connected with a metal frame piece, the periphery of the metal frame piece at the bottom end of the ceramic cover is fixed with the upper surface of the yoke iron plate in a laser welding mode, so that the bottom end of the static contact and the movable reed are accommodated in a cavity defined by the ceramic cover, the metal frame piece and the yoke iron plate; the first exhaust pipe is mounted on the metal frame piece.

The metal frame piece and the yoke plate enclose a main cavity body corresponding to the size of the area covered by the ceramic cover and a side cavity body which is integrally extended from the main cavity body to the side edge and is not covered by the ceramic cover, the first exhaust pipe is arranged on the top wall of the metal frame piece corresponding to the position of the side cavity body, and the bottom end of the first exhaust pipe extends into the side cavity body.

The yoke iron plate is provided with a first through hole for the lower end of the pushing rod component to pass through, the coil is provided with a second through hole, a movable iron core capable of moving along the through hole is matched in the second through hole of the coil, and the lower end of the pushing rod component is fixed with the movable iron core; and a metal shell with an upward opening is further arranged in the second through hole of the coil, the movable iron core is sleeved in the metal shell, the upper end of the metal shell is fixed below the yoke iron plate in a laser welding mode, and the first through hole of the yoke iron plate is contained in a laser welding area.

The yoke part consists of an upper yoke iron cylinder and a lower yoke iron cylinder, the upper yoke iron cylinder and the lower yoke iron cylinder are both of a cylindrical structure with an upward opening, and the bottom wall of the upper yoke iron cylinder is positioned below the ceramic cover and is connected with the ceramic cover in a sealing manner; the upper end of the side wall of the upper yoke iron cylinder leans against the outer side of the bottom of the protective cover, and the sealant is distributed on the outer side of the protective cover and the outer side of the upper end of the side wall of the upper yoke iron cylinder in a sealing manner; the lower yoke iron cylinder is arranged below the bottom wall of the upper yoke iron cylinder, and the coil is matched between the lower surface of the bottom wall of the upper yoke iron cylinder and the upper surface of the bottom wall of the lower yoke iron cylinder.

The bottom end of the ceramic cover is connected with a metal frame piece, the periphery of the metal frame piece at the bottom end of the ceramic cover is fixed with the upper surface of the bottom wall of the upper yoke iron cylinder in a laser welding mode, so that the bottom end of the static contact and the movable reed are accommodated in a cavity defined by the ceramic cover, the metal frame piece and the bottom wall of the upper yoke iron cylinder; the first exhaust pipe is mounted on the metal frame piece.

The metal frame piece and the bottom wall of the upper yoke iron cylinder enclose a main cavity body corresponding to the size of an area covered by the ceramic cover and a side cavity body which integrally extends to the side from the main cavity body and is not covered by the ceramic cover, the first exhaust pipe is arranged on the top wall of the metal frame piece corresponding to the position of the side cavity body, and the bottom end of the first exhaust pipe extends into the side cavity body.

The upper yoke iron cylinder is provided with a third through hole for the lower end of the pushing rod component to pass through, the coil is provided with a second through hole, a movable iron core capable of moving along the through hole is matched in the second through hole of the coil, and the lower end of the pushing rod component is fixed with the movable iron core; and a metal shell with an upward opening is further arranged in the second through hole of the coil, the movable iron core is sleeved in the metal shell, the upper end of the metal shell is fixed below the bottom wall of the upper yoke iron cylinder in a laser welding mode, and the third through hole of the upper yoke iron cylinder is contained in a laser welding area.

The periphery of the lower surface of the bottom wall of the upper yoke iron cylinder is lapped at the top end edge of the side wall of the lower yoke iron cylinder, and the joint of the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder and the top end edge of the side wall of the lower yoke iron cylinder is fixed in a laser welding mode.

The relay also comprises an extraction needle and a coil winding pin, wherein the extraction needle is arranged at the bottom wall of the upper yoke iron cylinder through a glass insulator or a ceramic insulator and enables the upper end of the extraction needle to be upwards exposed out of the bottom wall of the upper yoke iron cylinder, the lower end of the extraction needle is inserted and matched with the coil winding pin below the bottom wall of the upper yoke iron cylinder, and the coil winding pin is fixed on a coil frame of the coil; the leading-out needle and the glass insulator or the ceramic insulator are fixed through brazing, and the glass insulator or the ceramic insulator and the bottom wall of the upper yoke iron cylinder are fixed through brazing.

In the coil winding pin, a U-shaped clamping opening is formed in the inserting position corresponding to the lower end of the leading-out needle, and the lower end of the leading-out needle is inserted into the U-shaped clamping opening of the coil winding pin.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts the technical scheme that the ceramic cover is connected with the yoke part below the ceramic cover in a sealing mode, so that the contact assembly is positioned in an inner cavity surrounded by the ceramic cover and the yoke part, and the inner cavity is also provided with a first exhaust pipe for adjusting the pressure of the inner cavity; the yoke part is connected with the bottom of the protective cover, the yoke part is connected with the protective cover in a sealing mode through sealant, so that an outer cavity is formed between the ceramic cover and the protective cover, and the protective cover is further provided with a second exhaust pipe used for adjusting the pressure of the outer cavity. According to the structure, the relay forms an inner cavity and an outer cavity, different explosion-proof levels can be met by controlling the pressure of the two cavities, and double sealing of electric level sealing and explosion-proof level sealing is realized; in addition, due to the addition of the explosion-proof sealing cavity, certain isolation and noise reduction effects can be effectively achieved.

2. The invention adopts the upper yoke iron cylinder and the lower yoke iron cylinder to form the yoke iron part, and the bottom wall of the upper yoke iron cylinder is connected with the ceramic cover in a sealing way; the upper end of the side wall of the upper yoke iron cylinder leans against the outer side of the bottom of the protective cover, and the sealing glue is distributed on the outer side of the protective cover and the outer side of the upper end of the side wall of the upper yoke iron cylinder in a sealing manner; the lower yoke iron cylinder is arranged below the bottom wall of the upper yoke iron cylinder, and the coil is matched between the lower surface of the bottom wall of the upper yoke iron cylinder and the upper surface of the bottom wall of the lower yoke iron cylinder; meanwhile, the joint of the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder and the top edge of the side wall of the lower yoke iron cylinder is fixed in a laser welding mode, and the extraction needle is arranged on the bottom wall of the upper yoke iron cylinder in a brazing mode through a glass insulator. The structure of the invention also enables the coil cavity to be in a sealing state, achieves environmental sealing, can improve the reliability of the coil used in a high-humidity environment, and has the characteristics of excellent severe environment resistance, corrosion and mildew resistance of the coil, improved insulating strength and good long-term reliability; triple sealing of electric sealing, environmental sealing and explosion-proof sealing is realized.

The invention is further explained in detail with the accompanying drawings and the embodiments; however, the explosion-proof sealed high-voltage direct-current relay according to the present invention is not limited to the embodiment.

Drawings

FIG. 1 is a schematic external view of a first embodiment of the present invention;

fig. 2 is a perspective cross-sectional view (taken along a middle point perpendicular to a connecting line of two fixed contacts) of a first embodiment of the invention;

fig. 3 is a cross-sectional view (taken along a middle point perpendicular to a connecting line of two fixed contacts) of a first embodiment of the invention;

fig. 4 is a cross-sectional view (taken along a connecting line of two fixed contacts) of a first embodiment of the invention;

FIG. 5 is an exploded perspective view of a first embodiment of the present invention;

fig. 6 is a perspective cross-sectional view (taken along a middle point perpendicular to a connecting line of two fixed contacts) of a second embodiment of the invention;

fig. 7 is a cross-sectional view of a second embodiment of the invention (taken along a middle point perpendicular to a connecting line of two stationary contacts);

fig. 8 is a cross-sectional view of a second embodiment of the present invention (taken along the line connecting two stationary contacts);

FIG. 9 is an exploded perspective view of a second embodiment of the present invention;

FIG. 10 is a cross-sectional view of a second embodiment of the present invention (taken along the line connecting the two exit needles);

fig. 11 is a schematic structural diagram of a coil bobbin according to a second embodiment of the present invention.

Detailed Description

Example one

Referring to fig. 1 to 5, the explosion-proof sealed high-voltage direct-current relay of the present invention includes a ceramic cover 1, a contact assembly 2, a push rod member 3, a yoke member 4, a protective cover 5 and a coil 6; the contact assembly 2 and the coil 6 are distributed up and down, and the push rod part 3 is linked between the contact assembly 2 and the coil 6; the moving and static contacts of the contact assembly 2 are matched in the ceramic cover 1 with the opening arranged downwards; the yoke part 4 encloses the coil 6 therein; the protective cover is arranged on the ceramic cover, in the embodiment, the protective cover 5 is in a cover-shaped structure with a downward opening, the protective cover 5 is arranged on the ceramic cover 1 and is sleeved outside the ceramic cover 1 from top to bottom, so that the top wall of the protective cover 5 is positioned on the top wall of the ceramic cover 1, and the side wall of the protective cover 5 is positioned outside the side wall of the ceramic cover 1; the ceramic cover 1 is connected with the yoke part 4 below the ceramic cover 1 in a sealing mode, so that the contact assembly 2 is positioned in an inner cavity 11 enclosed by the ceramic cover 1 and the yoke part 4, and the inner cavity 11 is also provided with a first exhaust pipe 71 for adjusting the pressure of the inner cavity; the yoke part 4 is connected with the bottom of the protective cover 5, the yoke part 4 is connected with the protective cover 5 in a sealing manner through a sealant 73, in this embodiment, epoxy glue 73, so as to form an outer cavity 51 between the ceramic cover 1, the yoke part 4 and the protective cover 5, and the protective cover 5 is further provided with a second exhaust pipe 72 for adjusting the pressure of the outer cavity.

In this embodiment, the contact assembly 2 includes two fixed contacts 21 and a movable contact spring 22; the two static contacts 21 are respectively fixed on the top wall of the ceramic cover 1 in a brazing welding mode, the lower parts of the two static contacts 21 respectively extend into the cavity of the ceramic cover 1, and the upper surfaces of the two ends of the movable spring piece 22 serving as movable contacts are respectively matched with the bottom ends of the two static contacts 21 serving as static contacts; the upper end of the push rod part 3 is matched with a movable spring piece 22.

In this embodiment, the yoke part 4 is composed of a yoke plate 41 and a yoke cylinder 42, the yoke plate 41 is located below the ceramic cover 1 and connected with the ceramic cover 1 in a sealing manner; the yoke iron cylinder 42 has an upward opening, the yoke iron plate 41 is arranged in the yoke iron 42, and the coil 6 is arranged between the yoke iron plate 41 and the bottom of the yoke iron cylinder 42; the upper end of the side wall of the yoke iron cylinder 42 leans against the outer side of the bottom of the protective cover 5, and the epoxy glue 73 is distributed outside the protective cover 5 and the upper end of the side wall of the yoke iron cylinder 42 in a sealing manner. In the protection cover 5, a ring of ribs 52 is further provided at the contact position with the yoke cylinder 42, the ring of ribs 52 is blocked at the joint gap between the protection cover 5 and the yoke cylinder 42, and the ring of ribs 52 can limit the relative movement between the protection cover 5 and the yoke cylinder 42 on one hand, and can prevent the glue from entering into the yoke cylinder 42 on the other hand.

In this embodiment, the bottom end of the ceramic cover 1 is connected to a metal frame piece 74, and the periphery of the metal frame piece 74 at the bottom end of the ceramic cover 1 is fixed to the upper surface of the yoke plate 41 by laser welding, so that the bottom end of the static contact 21 and the movable spring 22 are accommodated in a cavity surrounded by the ceramic cover 1, the metal frame piece 74 and the yoke plate 41; the first exhaust pipe 71 is attached to the metal frame piece 74.

In this embodiment, the metal frame 74 and the yoke iron plate 41 enclose a main cavity 741 corresponding to the area covered by the ceramic cover 1 and a side cavity 742 extending from the main cavity 741 to the side without being covered by the ceramic cover, the first exhaust pipe 71 is installed at the top wall of the metal frame 74 corresponding to the side cavity 742, and the bottom end of the first exhaust pipe 71 extends into the side cavity 742.

In this embodiment, the yoke plate 41 is provided with a first through hole 411 for allowing the lower end of the push rod member to pass through, the coil 6 is provided with a second through hole 61, a movable iron core 75 capable of moving along the through hole is fitted in the second through hole 61 of the coil, and the lower end of the push rod member 3 is fixed to the movable iron core 75; a metal shell 76 with an upward opening is further disposed in the second through hole 61 of the coil 6, the plunger 75 is sleeved in the metal shell 76, the upper end of the metal shell 76 is fixed under the yoke plate 41 by laser welding and accommodates the first through hole 411 of the yoke plate 41 in the laser welding area.

In the present embodiment, the coil 6 includes a bobbin 62 and an enamel wire 63 wound around the bobbin 62, and the second through hole 61 is provided in the bobbin 62.

In this embodiment, the relay further includes an upper cover 81, a housing 82, and a permanent magnet 83, the permanent magnet 83 is disposed between the ceramic cover and the protective cover 5, and the epoxy resin 73 is disposed in an area surrounded by the upper cover 81, the protective cover 5, the housing 82, and the yoke cylinder 42. The number of the permanent magnets 83 is four, each two permanent magnets 83 correspond to a pair of moving and static contacts, and the polarities of the opposite surfaces of the two permanent magnets 83 are opposite.

In the present embodiment, the push rod part 3 includes a U-shaped basket 31, a spring seat 32, a push rod 33, a contact pressure spring 34, and a return spring 35; the bottom end of the U-shaped basket 31 is fixed with the spring seat 32, the movable spring plate 22 is arranged in a cavity defined by the U-shaped basket 31 and the spring seat 32 through the contact pressure spring 34, the lower end of the contact pressure spring 34 is abutted against the spring seat 32, and the upper end of the contact pressure spring 34 pushes the movable spring plate 22 to one surface of the inner side of the top wall of the U-shaped basket 31; the spring seat 32 is arranged on the yoke iron plate 41, the upper end of the push rod 33 is fixed with the spring seat 32, and the lower end of the push rod 33 passes through the first through hole 411 of the yoke iron plate 41 and is fixed with the movable iron core 75; the return spring 35 is installed between the yoke plate 41 and the plunger 75.

The invention relates to an explosion-proof sealed high-voltage direct-current relay, which adopts the technical scheme that a ceramic cover 1 is connected with a yoke part 4 below the ceramic cover in a sealing mode, so that a contact assembly 2 is positioned in an inner cavity 11 surrounded by the ceramic cover 1 and the yoke part 4, and the inner cavity 11 is also provided with a first exhaust pipe 71 for adjusting the pressure of the inner cavity; the yoke part 4 is connected with the bottom of the protective cover 5, the yoke part 4 is connected with the protective cover 5 in a sealing way through epoxy glue 73, so as to form an outer cavity 51 among the ceramic cover 1, the yoke part 4 and the protective cover 5, and the protective cover 5 is also provided with a second exhaust pipe 72 for adjusting the pressure of the outer cavity. The structure of the invention enables the relay to form an inner cavity and an outer cavity, different explosion-proof levels can be met by controlling the pressure of the two cavities, when the pressure of the inner cavity is designed to be larger than the pressure of the outer cavity, the structure is the same as that of a high-voltage direct current relay in the prior art, and products without explosion-proof requirements can be met; different explosion-proof grades can be realized by controlling the pressure difference of the inner cavity and the outer cavity; thereby realizing double sealing of electric sealing and explosion-proof sealing; in addition, an explosion-proof sealing cavity is added, so that a certain isolation and noise reduction effect can be effectively achieved; the explosion-proof sealing is a sealing environment formed by the metal yoke iron cylinder and the epoxy sealant, and a sound-proof shield is added in the process of transmitting sound through an air medium to assist in noise reduction.

Example two

Referring to fig. 6 to 11, the explosion-proof sealed high-voltage direct-current relay of the present invention is different from the first embodiment in that the yoke part 4 is composed of an upper yoke iron cylinder 43 and a lower yoke iron cylinder 44, the upper yoke iron cylinder 43 and the lower yoke iron cylinder 44 are both of a cylindrical structure with an upward opening, and a bottom wall of the upper yoke iron cylinder 43 is located below the ceramic cover 1 and connected with the ceramic cover 1 in a sealing manner; the upper end of the side wall of the upper yoke iron cylinder 43 leans against the outer side of the bottom of the protective cover 5, a circle of discontinuous ribs 53 is further arranged at the contact part of the protective cover 5 and the upper yoke iron cylinder 43, the ribs 53 are blocked at the joint of the protective cover 5 and the upper yoke iron cylinder 43 to limit the relative movement between the protective cover 5 and the upper yoke iron cylinder 43, and the ribs 53 play a limiting role. The epoxy glue 73 is distributed outside the protective cover 5 and outside the upper end of the side wall of the upper yoke iron cylinder 43 in a sealing manner; the lower yoke cylinder 44 is disposed below the bottom wall of the upper yoke cylinder 43, and the coil 6 is fitted between the lower surface of the bottom wall of the upper yoke cylinder 43 and the upper surface of the bottom wall of the lower yoke cylinder 44.

In this embodiment, the periphery of the metal frame piece 74 at the bottom end of the ceramic cover 1 is fixed to the upper surface of the bottom wall of the upper yoke iron cylinder 43 by laser welding, so that the bottom end of the stationary contact 21 and the movable spring 22 are accommodated in a cavity defined by the ceramic cover 1, the metal frame piece 74 and the bottom wall of the upper yoke iron cylinder 43.

In this embodiment, the metal frame piece 74 and the bottom wall of the upper yoke iron cylinder 43 enclose a main cavity 743 corresponding to the area covered by the ceramic cover and a side cavity 744 integrally extending from the main cavity to the side without being covered by the ceramic cover, the first exhaust pipe 71 is installed at the top wall of the metal frame piece 74 corresponding to the side cavity 744, and the bottom end of the first exhaust pipe 71 extends into the side cavity 744.

In this embodiment, the upper yoke iron cylinder 43 is provided with a third through hole 431 through which the lower end of the push rod member passes, and the upper end of the metal shell 76 is fixed to the lower surface of the bottom wall of the upper yoke iron cylinder 43 by laser welding and accommodates the third through hole 431 of the upper yoke iron cylinder 43 in the laser welding area.

In this embodiment, the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder 43 is overlapped with the top edge of the side wall of the lower yoke iron cylinder 44, and the joint between the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder 43 and the top edge of the side wall of the lower yoke iron cylinder 44 is fixed by laser welding.

In this embodiment, the relay further includes an extraction needle 65 and a coil winding pin 64, the extraction needle 65 is mounted at the bottom wall of the upper yoke iron cylinder 43 through a glass insulator 66 (which may also be a ceramic insulator) and makes the upper end of the extraction needle 65 upwardly exposed out of the bottom wall of the upper yoke iron cylinder 43, the lower end of the extraction needle 65 is inserted and matched with the coil winding pin 64 under the bottom wall of the upper yoke iron cylinder 43, and the coil winding pin 64 is fixed on the coil frame 62 of the coil 6; the lead-out pin 65 and the glass insulator 66 are fixed by brazing, and the glass insulator 66 and the bottom wall of the upper yoke iron cylinder 43 are fixed by brazing.

In this embodiment, the coil winding leg 64 is provided with a U-shaped clip 641 at the insertion position corresponding to the lower end of the drawing needle 65, and the lower end of the drawing needle is inserted into the U-shaped clip of the coil winding leg.

According to the explosion-proof sealed high-voltage direct-current relay, the upper yoke iron cylinder 43 and the lower yoke iron cylinder 44 are adopted to form a yoke iron part, and the bottom wall of the upper yoke iron cylinder 43 is connected with the ceramic cover 1 in a sealing mode; the upper end of the side wall of the upper yoke iron cylinder 43 leans against the outer side of the bottom of the protective cover 5, and the epoxy glue 73 is hermetically distributed on the outer side of the protective cover 5 and the outer side of the upper end of the side wall of the upper yoke iron cylinder 43; the lower yoke iron cylinder 44 is disposed below the bottom wall of the upper yoke iron cylinder 43, and the coil 6 is fitted between the lower surface of the bottom wall of the upper yoke iron cylinder 43 and the upper surface of the bottom wall of the lower yoke iron cylinder 44; at the same time, the lower periphery of the bottom wall of the upper yoke iron cylinder 43 and the top edge of the side wall of the lower yoke iron cylinder 44 are fixed by laser welding, and the lead-out pin 65 is attached to the bottom wall of the upper yoke iron cylinder 43 by brazing through a glass insulator 66. The structure of the invention also enables the coil cavity to be in a sealing state, achieves environmental sealing, can improve the reliability of the coil used in a high-humidity environment, and has the characteristics of excellent severe environment resistance, corrosion and mildew resistance of the coil, improved insulating strength and good long-term reliability; triple sealing of electric sealing, environmental sealing and explosion-proof sealing is realized.

The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. An explosion-proof sealed high-voltage direct-current relay comprises a ceramic cover, a contact assembly, a pushing rod component, a yoke component, a protective cover and a coil; the contact assembly and the coil are distributed up and down, and the pushing rod component is linked between the contact assembly and the coil; the moving and static contacts of the contact assembly are matched in the ceramic cover with the opening arranged downwards; the yoke member encloses the coil therein; the protective cover is arranged on the ceramic cover; the method is characterized in that: the ceramic cover is connected with the yoke iron part below the ceramic cover in a sealing mode so that the contact assembly is positioned in an inner cavity surrounded by the ceramic cover and the yoke iron part, and the inner cavity is also provided with a first exhaust pipe for adjusting the pressure of the inner cavity; the yoke part is connected with the bottom of the protective cover, the yoke part is connected with the protective cover in a sealing mode through sealant, so that an outer cavity is formed among the ceramic cover, the yoke part and the protective cover, and the protective cover is further provided with a second exhaust pipe used for adjusting the pressure of the outer cavity.

2. The explosion proof type high voltage direct current relay of claim 1, wherein: the contact assembly comprises two fixed contacts and a movable reed; the two fixed contacts are respectively fixed on the top wall of the ceramic cover in a brazing welding mode, the lower parts of the two fixed contacts respectively extend into the cavity of the ceramic cover, and the upper surfaces of the two ends of the movable spring leaf serving as movable contacts are respectively matched with the bottom ends of the two fixed contacts serving as fixed contacts; the upper end of the pushing rod component is matched with the movable spring.

3. The explosion proof type high voltage direct current relay of claim 2, wherein: the yoke iron part consists of a yoke iron plate and a yoke iron cylinder, and the yoke iron plate is positioned below the ceramic cover and connected with the ceramic cover in a sealing way; the yoke iron cylinder is provided with an upward opening, the yoke iron plates are arranged in the yoke iron cylinder, and the coil is arranged between the yoke iron plates and the cylinder bottom of the yoke iron cylinder; the upper end of the side wall of the yoke iron cylinder leans against the outer side of the bottom of the protective cover, and the sealant is distributed on the outer side of the protective cover and the outer side of the upper end of the side wall of the yoke iron cylinder in a sealing mode.

4. The explosion-proof level canned type high-voltage direct current relay of claim 3, characterized in that: the bottom end of the ceramic cover is connected with a metal frame piece, the periphery of the metal frame piece at the bottom end of the ceramic cover is fixed with the upper surface of the yoke plate in a laser welding mode, so that the bottom end of the static contact and the movable spring leaf are accommodated in a cavity defined by the ceramic cover, the metal frame piece and the yoke plate; the first exhaust pipe is mounted on the metal frame piece.

5. The explosion-proof level canned type high-voltage direct current relay of claim 4, characterized in that: the metal frame piece and the yoke plate enclose a main cavity body corresponding to the area covered by the ceramic cover and a side cavity body which is integrally extended from the main cavity body to the side edge and is not covered by the ceramic cover, the first exhaust pipe is arranged on the top wall of the metal frame piece corresponding to the side cavity body, and the bottom end of the first exhaust pipe extends into the side cavity body.

6. The explosion proof type high voltage direct current relay of claim 4, wherein: the yoke iron plate is provided with a first through hole for the lower end of the pushing rod component to pass through, the coil is provided with a second through hole, a movable iron core capable of moving along the through hole is matched in the second through hole of the coil, and the lower end of the pushing rod component is fixed with the movable iron core; and a metal shell with an upward opening is further arranged in the second through hole of the coil, the movable iron core is sleeved in the metal shell, the upper end of the metal shell is fixed below the yoke iron plate in a laser welding mode, and the first through hole of the yoke iron plate is contained in a laser welding area.

7. The explosion proof type high voltage direct current relay of claim 2, wherein: the yoke part consists of an upper yoke iron cylinder and a lower yoke iron cylinder, the upper yoke iron cylinder and the lower yoke iron cylinder are both of a cylindrical structure with an upward opening, and the bottom wall of the upper yoke iron cylinder is positioned below the ceramic cover and is connected with the ceramic cover in a sealing manner; the upper end of the side wall of the upper yoke iron cylinder leans against the outer side of the bottom of the protective cover, and the sealant is distributed on the outer side of the protective cover and the outer side of the upper end of the side wall of the upper yoke iron cylinder in a sealing manner; the lower yoke iron cylinder is arranged below the bottom wall of the upper yoke iron cylinder, and the coil is fitted between the lower surface of the bottom wall of the upper yoke iron cylinder and the upper surface of the bottom wall of the lower yoke iron cylinder.

8. The explosion proof type high voltage direct current relay of claim 7, wherein: the bottom end of the ceramic cover is connected with a metal frame piece, the periphery of the metal frame piece at the bottom end of the ceramic cover is fixed with the upper surface of the bottom wall of the upper yoke iron cylinder in a laser welding mode, so that the bottom end of the static contact and the movable spring leaf are accommodated in a cavity defined by the ceramic cover, the metal frame piece and the bottom wall of the upper yoke iron cylinder; the first exhaust pipe is mounted on the metal frame piece.

9. The explosion-proof level canned type high-voltage direct current relay of claim 8, characterized in that: the metal frame piece and the bottom wall of the upper yoke iron cylinder enclose a main cavity body corresponding to the size of an area covered by the ceramic cover and a side cavity body which integrally extends to the side from the main cavity body and is not covered by the ceramic cover, the first exhaust pipe is arranged on the top wall of the metal frame piece corresponding to the position of the side cavity body, and the bottom end of the first exhaust pipe extends into the side cavity body.

10. The explosion proof type high voltage direct current relay of claim 8, wherein: the upper yoke iron cylinder is provided with a third through hole for the lower end of the pushing rod component to pass through, the coil is provided with a second through hole, a movable iron core capable of moving along the through hole is matched in the second through hole of the coil, and the lower end of the pushing rod component is fixed with the movable iron core; and a metal shell with an upward opening is further arranged in the second through hole of the coil, the movable iron core is sleeved in the metal shell, the upper end of the metal shell is fixed below the bottom wall of the upper yoke iron cylinder in a laser welding mode, and the third through hole of the upper yoke iron cylinder is contained in a laser welding area.

11. The explosion proof type high voltage direct current relay of claim 10, wherein: the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder is lapped at the top end edge of the side wall of the lower yoke iron cylinder, and the joint of the periphery of the lower surface of the bottom wall of the upper yoke iron cylinder and the top end edge of the side wall of the lower yoke iron cylinder is fixed in a laser welding mode.

12. The explosion proof type high voltage direct current relay of claim 7, wherein: the relay also comprises an extraction needle and a coil winding pin, wherein the extraction needle is arranged at the bottom wall of the upper yoke iron cylinder through a glass insulator or a ceramic insulator and enables the upper end of the extraction needle to be upwards exposed out of the bottom wall of the upper yoke iron cylinder, the lower end of the extraction needle is inserted and matched with the coil winding pin below the bottom wall of the upper yoke iron cylinder, and the coil winding pin is fixed on a coil frame of the coil; the leading-out needle and the glass insulator or the ceramic insulator are fixed through brazing, and the glass insulator or the ceramic insulator and the bottom wall of the upper yoke iron cylinder are fixed through brazing.

13. The explosion proof type high voltage direct current relay of claim 12, wherein: in the coil winding pin, a U-shaped clamping opening is formed in the inserting position corresponding to the lower end of the leading-out needle, and the lower end of the leading-out needle is inserted into the U-shaped clamping opening of the coil winding pin.