CN114613628A

CN114613628A - Direct current contactor

Info

Publication number: CN114613628A
Application number: CN202210270983.5A
Authority: CN
Inventors: 李闻斌; 陈贤平; 程恒
Original assignee: Shenzhen Youlitong New Energy Technology Co ltd
Current assignee: Shenzhen Youlitong New Energy Technology Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-10
Anticipated expiration: 2042-03-18
Also published as: CN114613628B

Abstract

The invention relates to the technical field of direct current contactors, in particular to a direct current contactor, which comprises a machine shell, a static contact piece, a movable contact piece, a metal grid piece, an electromagnetic push rod and a pressure reducing assembly, wherein the static contact piece, the movable contact piece, the electromagnetic push rod and the pressure reducing assembly are arranged in the machine shell, the static contact piece is provided with a first current end, a second current end, a first contact and a second contact, the first current end is electrically connected with the first contact, the second current end is electrically connected with the second contact, the movable contact piece is provided with a third contact and a fourth contact, the third contact is electrically connected with the fourth contact, the pressure reducing assembly is arranged in the machine shell, partition plates are arranged on two sides in the machine shell, the first contact and the second contact are respectively positioned at the top ends of the two partition plates, the third contact and the fourth contact are respectively positioned at the top ends of the first contact and the second contact, the movable contact and the partition plates divide an inner cavity of the machine shell into a first cavity and a second cavity, the metal grid piece is arranged between the first contact and the second contact along the horizontal direction, the movable contact spring goes up and down in the first chamber, and this contactor arc extinguishing efficiency, reliability and performance are higher.

Description

Direct current contactor

Technical Field

The invention relates to the technical field of direct current contactors, in particular to a direct current contactor.

Background

The direct current contactor is an electromagnetic switch with strong universality, can frequently switch on and off a direct current main circuit, can realize remote control, and is widely applied to the technical field of circuit control. The general applied environment of the existing direct current contactor is a low voltage range, the cut-off voltage is within 300V, and when the cut-off voltage value is as high as 700V-800V, the existing direct current contactor has the problems of unstable contact, easy damage of coil components and the like. When the direct current contactor works, the internal temperature can rise, so that the internal pressure is increased, the existing direct current contactor is a sealing structure, the pressure cannot be released in time, potential safety hazards exist, the arc extinguishing efficiency of the existing contactor is lower, and the reliability and the use performance are lower.

Chinese patent CN201611254105.5 provides a high performance dc contactor, including casing, coil pack, stationary contact subassembly, movable contact subassembly, determine module, arc extinguishing subassembly and decompression subassembly, the stationary contact subassembly includes the stationary contact support, and the stationary contact support includes roof and contact chamber, and the arc extinguishing subassembly sets up in the contact chamber, decompression subassembly fixed connection is in on the roof, decompression subassembly is used for balancing the inside and outside atmospheric pressure of casing, determine module is used for detecting dc contactor operating condition, determine module respectively with movable contact subassembly and stationary contact leg joint, the stationary contact subassembly is fixed on the stationary contact support, the movable contact subassembly is located the below of stationary contact support, and movable contact subassembly below is connected with the coil pack.

The contactor cannot blow the arc rapidly towards the arc extinguishing assembly.

Disclosure of Invention

In view of the above, it is necessary to provide a dc contactor to solve the problems in the prior art.

In order to solve the problems of the prior art, the invention adopts the technical scheme that:

a direct current contactor comprises a machine shell, a static contact, a movable contact, a metal grid sheet, an electromagnetic push rod and a pressure reducing assembly, wherein the static contact is arranged in the machine shell and provided with a first current end, a second current end, a first contact and a second contact, the first current end is electrically connected with the first contact, the second current end is electrically connected with the second contact, the movable contact is provided with a third contact and a fourth contact, the third contact is electrically connected with the fourth contact, the movable contact is connected with an actuating rod of the electromagnetic push rod and used for being opened and closed with the static contact, when the contactor is sucked, the first contact is electrically connected with the third contact, the second contact is electrically connected with the fourth contact, the pressure reducing assembly is arranged in the machine shell and used for balancing air pressure inside and outside the machine shell, partition plates extending along the horizontal direction are arranged on two sides in the machine shell, the first contact and the second contact are respectively positioned at the top ends of the two partition plates, the third contact and the fourth contact are respectively positioned at the top ends of the first contact and the second contact, the movable contact piece and the partition plate divide the inner cavity of the shell into a first cavity and a second cavity, the metal grid piece is arranged between the first contact and the second contact along the horizontal direction, and the movable contact piece lifts in the first cavity.

Preferably, an insulating plate clamping the static contact with the inner wall of the casing is further arranged in the first chamber.

Preferably, the insulating board is hollow, an air inlet which is communicated with the hollow layer of the insulating board and faces the top surface of the movable contact spring vertically and an air outlet groove which is communicated with the hollow layer of the insulating board and faces the two sides of the metal grid piece horizontally are formed in the insulating board, the contactor further comprises a corrugated pipe, the corrugated pipe is arranged at the top end of the movable contact spring along the vertical direction, and the top end of the corrugated pipe is communicated with the air outlet groove.

Preferably, the bottom of baffle is equipped with the pole of taking that extends along the horizontal direction, and the contactor still includes the bracket, and the bracket is pegged graft between two baffles and the pole of taking along the horizontal direction, and the both sides of bracket are provided with downwardly extending and the butt at the centre gripping ear of two baffle both sides, still are equipped with on the bracket along vertical penetrating through the gas tank, the top position placed in the middle of the boss be equipped with metal bars piece fixed connection's boss.

Preferably, a transverse plate extending along the horizontal direction is arranged on an actuating rod of the electromagnetic push rod, longitudinal plates which penetrate through the metal grid sheet along the vertical direction and are in sliding fit with the metal grid sheet are arranged on two sides of the top end of the transverse plate, lug plates extending along the horizontal direction are arranged on the top ends of the longitudinal plates, the lug plates are fixedly connected with the metal grid sheet, and the transverse plate, the longitudinal plates and the lug plates are made of insulating materials.

Preferably, the contactor further comprises two electric connectors, wherein the two electric connectors penetrate through the top of the casing along the vertical direction, and the two electric connectors are electrically connected with the first current end and the second current end respectively.

Preferably, the pressure reducing assembly comprises a cylinder body, a piston head, an adjusting disc and a spring, wherein a first channel, a second channel and a third channel which are coaxial with the cylinder body are sequentially arranged in the cylinder body from top to bottom, the inner diameters of the first channel, the second channel and the third channel are gradually increased, the piston head is arranged in the second channel in a sliding mode and is abutted against the step surfaces of the first channel and the second channel, a plug cylinder which is coaxial with the piston head is arranged at the bottom end of the piston head, the adjusting disc is coaxially arranged in the third channel, an air vent which is communicated with the outside and the inside of the third channel is arranged on the adjusting disc, a positioning rod which is coaxial with the adjusting disc is arranged at the top end of the adjusting disc, and the positioning rod extends into the plug cylinder and is in sliding fit with the plug cylinder; the spring is coaxially arranged in the plug barrel, and two ends of the spring are respectively abutted to the top end of the inner cavity of the plug barrel and the top end of the positioning rod.

Preferably, the top end edge of the piston head has a conical surface coaxially abutting in the first passage.

Preferably, the adjusting disk is screwed coaxially into the third channel.

Preferably, the piston head is sleeved with a sealing ring in interference fit with the second channel.

Compared with the prior art, the beneficial effect of this application is:

1. according to the arc extinguishing device, the pressure in the first chamber is increased through the movement of the static contact, so that the arc generated by disconnection between the static contact and the pressure reducing component can be blown to the metal grid sheet under the action of the pressure, the arc between the first contact and the third contact and the arc between the second contact and the fourth contact can be relatively offset on the metal grid sheet, and arc extinguishing is timely carried out;

2. the insulating plate which clamps the static contact piece with the inner wall of the shell is arranged in the first cavity, so that the movable contact piece can lift in the insulating plate, and the movable contact piece is prevented from contacting with the static contact piece when the movable contact piece is disconnected;

3. according to the arc extinguishing device, the inner part of the insulating plate is hollow, the insulating plate is provided with the air inlet and the air outlet groove, the air inlet and the air outlet groove are communicated with the hollow layer of the insulating plate, air flow in the corrugated pipe sequentially passes through the air inlet and the air outlet groove, and electric arcs are blown to the metal grid sheet quickly, so that arc extinguishing operation is completed;

4. according to the metal grid piece, the lapping rod extending in the horizontal direction and the bracket capable of clamping the lapping rod through the two clamping lugs are arranged in the shell, so that the metal grid piece can be arranged at the top end of the boss in the horizontal direction, and the air passing groove can facilitate air flow exchange between the first cavity and the second cavity, so that the air flow blows electric arcs to the metal grid piece;

5. according to the electromagnetic push rod, the transverse plate extending along the horizontal direction is arranged on the execution shaft of the electromagnetic push rod, the longitudinal plates penetrating through the metal grid sheet along the vertical direction and in sliding fit with the metal grid sheet are arranged on two sides of the transverse plate, so that the movable contact sheet is positioned at the top end of the metal grid sheet and fixedly connected with the ear plates, and the execution shaft of the electromagnetic push rod can upwards lift the movable contact sheet by pushing the transverse plate, the longitudinal plates and the ear plates;

6. according to the power supply device, the top end of the shell is provided with the two electric connectors which are electrically connected with the first current end and the second current end respectively, so that an external circuit can be communicated with the first current end and the second current end through the two electric connectors respectively;

7. the piston head is arranged in the cylinder body in a sliding mode through the piston piece, when the pressure inside the shell is within a certain range, the sliding piston head can store hot pressing, and when the pressure inside the shell exceeds the certain range, the cylinder body is communicated with the inside of the shell and the outside, so that the hot pressing is released;

8. the present application is directed to a piston head having a top edge formed with a conical surface coaxial therewith. The conical surface can be coaxially abutted in the first channel, so that the inner cavity of the shell is stably plugged;

9. according to the invention, the adjusting disc is coaxially screwed in the third channel, namely, the position of the adjusting disc in the third channel can be adjusted by rotating the adjusting disc, so that the elasticity of the spring is adjusted, and the adjusting disc is suitable for contactors in different hot-pressing environments;

10. this application establishes the sealing washer with second passageway interference fit through the cover on the piston head, when the piston head breaks away from the second passageway completely, seals through the sealing washer between second passageway and the third passageway to this prevents that the air current from spilling over in advance.

Drawings

Fig. 1 is a perspective view of a dc contactor of the present application;

FIG. 2 is a side view of the DC contactor of the present application;

FIG. 3 is a perspective sectional view at section A-A of FIG. 2;

FIG. 4 is a cross-sectional view at section A-A of FIG. 2;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

FIG. 6 is a perspective view of the present application with the stationary and movable contacts closed;

FIG. 7 is a perspective view of the moving contact and electromagnetic pushrod of the present application;

FIG. 8 is a perspective view of a metal grid and bracket of the present application;

fig. 9 is a front view of the metal grid and carrier of the present application.

The reference numbers in the figures are:

1 a-a housing; 1a 1-baffle; 1a2 — first chamber; 1a3 — second chamber; 1a 4-insulating panels; 1a 5-gas inlet; 1a 6-outlet slot; 1a 7-lap bar; 1 b-static contact; 1b1 — first current terminal; 1b2 — second current terminal; 1b3 — first contact; 1b4 — second contact; 1 c-a movable contact; 1c 1-third contact; 1c 2-fourth contact; 1 d-a metal grid sheet; 1 e-an electromagnetic push rod; 1e 1-cross plate; 1e 2-longitudinal panels; 1e 3-otic placode; 1 f-a bracket; 1f 1-clamping lug; 1f 2-air passing groove; 1f 3-boss; 1 g-electric connector; 1 h-corrugated pipe; 2-a pressure relief assembly; 2 a-a cylinder; 2a1 — first channel; 2a2 — second channel; 2a3 — third channel; 2 b-a piston head; 2b 1-plug cartridge; 2b 2-taper; 2b 3-sealing ring; 2 c-adjusting disk; 2c 1-vent; 2c 2-locating lever; 2 d-spring.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1-9, the present application provides:

a direct current contactor comprises a machine shell 1a, a static contact 1b, a movable contact 1c, a metal grid sheet 1d, an electromagnetic push rod 1e and a pressure reducing assembly 2, wherein the static contact 1b is arranged in the machine shell 1a, the static contact 1b is provided with a first current end 1b1, a second current end 1b2, a first contact 1b3 and a second contact 1b4, the first current end 1b1 is electrically connected with the first contact 1b3, the second current end 1b2 is electrically connected with the second contact 1b4, the movable contact 1c is provided with a third contact 1c1 and a fourth contact 1c2, the third contact 1c1 is electrically connected with the fourth contact 1c2, the movable contact 1c is connected with an actuating rod of the electromagnetic push rod 1e and is used for opening and closing with the static contact 1b, when the contactor is sucked in and out, the first contact 3 is electrically connected with the third contact 1, the second contact 1b4 is connected with the fourth contact 1c2, and the pressure reducing assembly 1a is arranged in the machine shell 1a for balancing the pressure reducing assembly 1a, two sides in the machine shell 1a are provided with partition boards 1a1 extending along the horizontal direction, a first contact 1b3 and a second contact 1b4 are respectively positioned at the top ends of the two partition boards 1a1, a third contact 1c1 and a fourth contact 1c2 are respectively positioned at the top ends of the first contact 1b3 and the second contact 1b4, the inner cavity of the machine shell 1a is divided into a first chamber 1a2 and a second chamber 1a3 by the movable contact 1c and the partition boards 1a1, a metal grid sheet 1d is horizontally arranged between the first contact 1b3 and the second contact 1b4, and the movable contact 1c is lifted in the first chamber 1a 2.

Based on the above embodiments, the technical problem that the present application intends to solve is that when the housing 1a and the static contact piece 1b are disconnected, the arc generated between the disconnection ports thereof cannot be drawn to the metal grid piece 1d in time. For this purpose, the present application, through the movement of the static contact piece 1b, increases the pressure in the first chamber 1a2, so that the arc generated by the disconnection between 01 and the pressure reducing assembly 2 can be blown to the metal grid piece 1d under the pressure, and the arc between the first contact 1b3 and the third contact 1c1, and the arc between the second contact 1b4 and the fourth contact 1c2 can be relatively cancelled on the metal grid piece 1d, so as to extinguish the arc in time;

specifically, when the static contact piece 1b and the movable contact piece 1c are in a closed state, the first contact 1b3 and the third contact 1c1 are communicated, the second contact 1b4 and the fourth contact 1c2 are communicated, and the first current end 1b1 is electrically connected with the first contact 1b3, the second current end 1b2 is electrically connected with the second contact 1b4, and the third contact 1c1 is electrically connected with the fourth contact 1c2, so that the first current end 1b1 and the second current end 1b2 are in a conducting state;

when the first current terminal 1b1 and the second current terminal 1b2 need to be disconnected, the electromagnetic push rod 1e is started to lift the movable contact piece 1c axially, i.e., so that the first contact 1b3 and the third contact 1c1 are open, the first contact 1b3 is open with the fourth contact 1c2, when the static contact piece 1b and the movable contact piece 1c are closed, the movable contact piece 1c is matched with the machine shell 1a to divide the inner cavity of the machine shell 1a into a first chamber 1a2 and a second chamber 1a3 which are relatively independent, when the movable contact piece 1c moves upward in the first chamber 1a2, the pressure in the first chamber 1a2 increases, so that the airflow overflows into the partition board 1a1 from the first contact 1b3 and the third contact 1c1, and between the second contact 1b4 and the fourth contact 1c2, thereby enabling the white air flow to blow the arc generated when the first contact 1b3 and the third contact 1c1, and the second contact 1b4 and the fourth contact 1c2 are opened toward the metal grid piece 1 d;

the metal grid sheet 1d divides the electric arc into a plurality of sections, and the electric arcs on the two sides move in opposite directions after being processed by the metal grid sheet 1d, so that the divided electric arcs can be mutually offset, and the arc extinguishing operation can be rapidly finished;

because of the inner chamber of casing 1a is in encapsulated situation, the arc extinguishing in-process can produce heat, and then makes the inner chamber pressure of casing 1a increase, and too big pressure can lead to its inner structure unstable to and dangerous, can effectively slow down its inside pressure that increases through pressure reduction component 2, thereby improve the security.

As shown in fig. 4, further:

the first chamber 1a2 is further provided with an insulating plate 1a4 which holds the static contact piece 1b with the inner wall of the cabinet 1 a.

Based on the above-mentioned embodiments, the technical problem that the present application intends to solve is how to avoid the lifted movable contact piece 1c from contacting the stationary contact piece 1 b. For this reason, the present application prevents the movable contact piece 1c from contacting the fixed contact piece 1b when it is disconnected by providing the insulating plate 1a4 that sandwiches the fixed contact piece 1b with the inner wall of the housing 1a in the first chamber 1a2, so that the movable contact piece 1c can be lifted and lowered inside the insulating plate 1a 4.

As shown in fig. 4, further:

insulating board 1a4 is inside hollow, offer on insulating board 1a4 with its hollow layer intercommunication and vertical towards the air inlet 1a5 of movable contact spring 1c top surface to and rather than hollow layer intercommunication and the level towards the gas outlet groove 1a6 of metal bars piece 1d both sides, the contactor still includes bellows 1h, bellows 1h sets up the top at movable contact spring 1c along vertical direction, and the top and the gas outlet groove 1a6 intercommunication of bellows 1 h.

Based on the above embodiments, the technical problem to be solved by the present application is how to improve the efficiency of the gas flow blowing the arc toward the metal grid 1 d. For this purpose, the present application completes the arc extinguishing operation by making the inside of the insulating plate 1a4 hollow, and opening the air inlet 1a5 and the air outlet groove 1a6 on the insulating plate 1a4, so that the air inlet 1a5 and the air outlet groove 1a6 are both communicated with the hollow layer of the insulating plate 1a4, and when the movable contact 1c moves upward in the first chamber 1a2, the bellows 1h is compressed, i.e., the internal pressure of the insulating plate 1a4 is increased, so that the air flow in the bellows 1h passes through the air inlet 1a5 and the air outlet groove 1a6 in sequence, and blows to the first contact 1b3 and the third contact 1c1, and the second contact 1b4 and the fourth contact 1c2 in the horizontal direction, so that the arc is blown to the metal grid 1d quickly.

As shown in fig. 4, further:

the bottom of baffle 1a1 is equipped with the pole of taking 1a7 that extends along the horizontal direction, and the contactor still includes bracket 1f, and bracket 1f pegs graft between two baffle 1a1 and pole of taking 1a7 along the horizontal direction, and the both sides of bracket 1f are provided with downwardly extending and butt in the centre gripping ear 1f1 of two baffle 1a1 both sides, still be equipped with on the bracket 1f along vertical through gas tank 1f2, boss 1f 3's top central point is equipped with the boss 1f3 with metal grid piece 1d fixed connection.

Based on the above-described embodiments, the technical problem that the present application intends to solve is how to arrange the metal grid piece 1d between the two partition boards 1a1 in the horizontal direction. For this reason, the present application enables the metal grid piece 1d to be placed on the top end of the boss 1f3 in the horizontal direction by providing the strap 1a7 extending in the horizontal direction in the housing 1a and the bracket 1f capable of clamping the strap 1a7 by the two clamping lugs 1f1, and the air passing groove 1f2 facilitates the exchange of the air flow between the first chamber 1a2 and the second chamber 1a3 so that the air flow blows the arc to the metal grid piece 1 d.

As shown in fig. 7, further:

the actuating rod of the electromagnetic push rod 1e is provided with a transverse plate 1e1 extending along the horizontal direction, two sides of the top end of the transverse plate 1e1 are provided with a longitudinal plate 1e2 penetrating through the metal grid sheet 1d along the vertical direction and in sliding fit with the metal grid sheet, the top end of the longitudinal plate 1e2 is provided with an ear plate 1e3 extending along the horizontal direction, the ear plate 1e3 is fixedly connected with the metal grid sheet 1d, and the transverse plate 1e1, the longitudinal plate 1e2 and the ear plate 1e3 are all made of insulating materials.

Based on the above embodiments, the technical problem to be solved by the present application is how the electromagnetic push rod 1e lifts the metal grid 1d upward. For this reason, the present application arranges a horizontal plate 1e1 extending along the horizontal direction on the actuating shaft of the electromagnetic push rod 1e, and arranges vertical plates 1e2 penetrating the metal grid plate 1d along the vertical direction and sliding matching with the metal grid plate 1d on both sides of the horizontal plate 1e1, so that the movable contact plate 1c is positioned at the top end of the metal grid plate 1d and fixedly connected with the ear plate 1e3, so that the actuating shaft of the electromagnetic push rod 1e can lift the movable contact plate 1c upwards by pushing the horizontal plate 1e1, the vertical plates 1e2 and the ear plate 1e3, and the horizontal plate 1e1, the vertical plates 1e2 and the ear plate 1e3 are all made of insulating materials, thereby avoiding the short circuit phenomenon when the static contact plate 1b and the movable contact plate 1c are closed.

As shown in fig. 1 and 3, further:

the contactor further comprises two electric connectors 1g, two electric connectors 1g penetrate through the top of the casing 1a along the vertical direction, and the two electric connectors 1g are electrically connected with the first current terminal 1b1 and the second current terminal 1b2 respectively.

Based on the above embodiments, the technical problem to be solved by the present application is how to make the first current terminal 1b1 and the second current terminal 1b2 communicate with the external circuit. For this purpose, the present application provides two electrical connectors 1g electrically connected to the first current terminal 1b1 and the second current terminal 1b2 at the top end of the housing 1a, so that the external circuit can be connected to the first current terminal 1b1 and the second current terminal 1b2 through the two electrical connectors 1 g.

As shown in fig. 5, further:

the pressure reducing assembly 2 comprises a cylinder body 2a, a piston head 2b, an adjusting disc 2c and a spring 2d, wherein a first channel 2a1, a second channel 2a2 and a third channel 2a3 which are coaxial with the cylinder body 2a are sequentially arranged in the cylinder body 2a from top to bottom, the inner diameters of the first channel 2a1, the second channel 2a2 and the third channel 2a3 are gradually increased, the piston head 2b is arranged in the second channel 2a2 in a sliding mode, the piston head 2b abuts against the step surfaces of the first channel 2a1 and the second channel 2a2, the bottom end of the piston head 2b is provided with a plug cylinder 2b1 which is coaxial with the piston head, the adjusting disc 2c is arranged in the third channel 2a3 in a coaxial mode, the adjusting disc 2c is provided with a vent hole 2c1 which communicates the outside and the inside of the third channel 2a3, the top end of the adjusting disc 2c is provided with a positioning rod 2c2 which is coaxial with the positioning rod, and the positioning rod 2c2 extends into the plug cylinder 2b1 and is in a sliding fit with the plug cylinder; the spring 2d is coaxially provided in the plug cylinder 2b1, and both ends of the spring 2d abut against the tip of the inner cavity of the plug cylinder 2b1 and the tip of the positioning rod 2c2, respectively.

Based on the above-described embodiments, the technical problem that the present application intends to solve is how the decompression assembly 2 relieves the hot pressing inside the cabinet 1 a. For this purpose, the piston head 2b is slidably disposed in the cylinder 2a by a member, when the pressure inside the casing 1a is within a certain range, the sliding piston head 2b can store hot pressing, and when the pressure inside the casing 1a exceeds a certain range, the cylinder 2a communicates the inside of the casing 1a with the outside, thereby releasing the hot pressing;

specifically, when the internal pressure of the housing 1a is stable, the top of the piston head 2b abuts against the stepped surfaces of the first channel 2a1 and the second channel 2a2, so as to block the first channel 2a1 and the second channel 2a2, when the internal pressure of the housing 1a gradually rises, the piston head 2b gradually slides in the second channel 2a2 against the elastic force of the spring 2d, so that the first channel 2a1 and the second channel 2a2 communicate, and at the same time, the plunger 2b1 coaxially slides on the positioning rod 2c2, and when the pressure is within a certain range, the second channel 2a2 and the third channel 2a3 are in a non-communication state, and until the piston head 2b completely disengages from the second channel 2a2, the second channel 2a2 and the third channel 2a3 are not communicated, so that the inner cavity of the housing 1a communicates with the external vent hole through the first channel 2a1, the second channel 2a2, the third channel 2a3, and the third channel 2c 1;

when the air pressure inside the housing 1a is released, the piston head 2b is reset under the elastic force of the spring 2d, and the piston head 2b is again abutted on the stepped surface of the first passage 2a1 and the second passage 2a2, so that the first passage 2a1 and the second passage 2a2 are blocked again.

As shown in fig. 5, further:

the top end edge of the piston head 2b has a tapered surface 2b2 that coaxially abuts in the first passage 2a 1.

Based on the above-described embodiment, the technical problem that the present application intends to solve is how to enable the tip end of the piston head 2b to coaxially abut in the first passage 2a 1. For this purpose, the present application provides for forming the top edge of the piston head 2b with a tapered surface 2b2 coaxial therewith. So that the conical surface 2b2 can coaxially abut against the first channel 2a1, thereby stably blocking the inner cavity of the housing case 1 a.

As shown in fig. 5, further:

the adjusting disk 2c is screwed coaxially into the third passage 2a 3.

Based on the above-described embodiment, the technical problem that the present application intends to solve is how to adjust the elastic force of the spring 2 d. For this reason, the present application can adjust the position of the adjusting disk 2c in the third channel 2a3 by screwing the adjusting disk 2c coaxially in the third channel 2a3, i.e., by rotating the adjusting disk 2c, thereby adjusting the elastic force of the spring 2d, and thus adapting to contactors in different hot pressing environments.

As shown in fig. 5, further:

the piston head 2b is sleeved with a sealing ring 2b3 which is in interference fit with the second channel 2a 2.

Based on the above embodiments, the technical problem that the present application intends to solve is how to prevent the air flow in the housing 1a from overflowing outwards through the wall gap when the piston head 2b slides on the second channel 2a 2. For this reason, according to the present application, by sleeving the piston head 2b with the sealing ring 2b3 in interference fit with the second channel 2a2, when the piston head 2b is not completely separated from the second channel 2a2, the second channel 2a2 and the third channel 2a3 are sealed by the sealing ring 2b3, so as to prevent the air flow from overflowing in advance.

The pressure in the first chamber 1a2 is increased by the movement of the static contact piece 1b, so that the arc generated between the contact 01 and the decompression component 2 due to disconnection can be blown to the metal grid piece 1d under the action of the pressure, and the arc between the first contact 1b3 and the third contact 1c1 and the arc between the second contact 1b4 and the fourth contact 1c2 can be relatively offset on the metal grid piece 1d, so that the arc can be extinguished in time.

The above examples only show one or more embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A direct current contactor comprises a shell (1a), a static contact (1b), a movable contact (1c), a metal grid sheet (1d) and an electromagnetic push rod (1e), wherein the static contact (1b), the movable contact (1c), the metal grid sheet (1d) and the electromagnetic push rod (1e) are arranged in the shell (1a), the static contact (1b) is provided with a first current end (1b1), a second current end (1b2), a first contact (1b3) and a second contact (1b4), the first current end (1b1) is electrically connected with the first contact (1b3), the second current end (1b2) is electrically connected with the second contact (1b4), the movable contact (1c) is provided with a third contact (1c1) and a fourth contact (1c2), the third contact (1c1) is electrically connected with the fourth contact (1c2), the movable contact (1c) is connected with an actuating rod of the electromagnetic push rod (1e) to be opened with the static contact (1b), and the first contact (3) is electrically connected with the third contact (3), the second contact (1b4) is electrically connected with the fourth contact (1c2), the air pressure balance device is characterized by further comprising a pressure reduction assembly (2), the pressure reduction assembly (2) is arranged in the machine shell (1a) and used for balancing air pressure inside and outside the machine shell (1a), partition plates (1a1) extending along the horizontal direction are arranged on two sides in the machine shell (1a), the first contact (1b3) and the second contact (1b4) are respectively located at the top ends of the two partition plates (1a1), the third contact (1c1) and the fourth contact (1c2) are respectively located at the top ends of the first contact (1b3) and the second contact (1b4), and the inner cavity of the shell (1a) is divided into a first chamber (1a2) and a second chamber (1a3) by the movable contact piece (1c) and the partition plate (1a1), the metal grid piece (1d) is arranged between the first contact (1b3) and the second contact (1b4) along the horizontal direction, and the movable contact piece (1c) is lifted in the first chamber (1a 2).

2. A dc contactor according to claim 1, characterized in that the first chamber (1a2) is further provided with an insulating plate (1a4) for holding the static contact (1b) with the inner wall of the casing (1 a).

3. The direct current contactor as claimed in claim 2, wherein the insulating plate (1a4) is hollow inside, the insulating plate (1a4) is provided with an air inlet (1a5) communicated with the hollow layer and facing vertically to the top surface of the movable contact piece (1c), and an air outlet groove (1a6) communicated with the hollow layer and facing horizontally to the two sides of the metal grid piece (1d), the contactor further comprises a corrugated pipe (1h), the corrugated pipe (1h) is arranged at the top end of the movable contact piece (1c) along the vertical direction, and the top end of the corrugated pipe (1h) is communicated with the air outlet groove (1a 6).

4. The direct current contactor according to claim 1, wherein the bottom of the partition plate (1a1) is provided with an access rod (1a7) extending along the horizontal direction, the contactor further comprises a bracket (1f), the bracket (1f) is inserted between the two partition plates (1a1) and the access rod (1a7) along the horizontal direction, two sides of the bracket (1f) are provided with clamping lugs (1f1) extending downwards and abutting against two sides of the two partition plates (1a1), the bracket (1f) is further provided with an air groove (1f2) penetrating through vertically, and the top center of the boss (1f3) is provided with a boss (1f3) fixedly connected with the metal grid piece (1 d).

5. The direct current contactor according to claim 1, wherein the actuating rod of the electromagnetic push rod (1e) is provided with a horizontal plate (1e1) extending along the horizontal direction, both sides of the top end of the horizontal plate (1e1) are provided with longitudinal plates (1e2) penetrating through the metal grid sheet (1d) along the vertical direction and slidably fitting with the metal grid sheet, the top end of the longitudinal plate (1e2) is provided with lug plates (1e3) extending along the horizontal direction, the lug plates (1e3) are fixedly connected with the metal grid sheet (1d), and the horizontal plate (1e1), the longitudinal plate (1e2) and the lug plates (1e3) are all made of insulating materials.

6. A dc contactor according to claim 1, characterized in that the contactor further comprises two electric terminals (1g), two electric terminals (1g) extending vertically through the top of the casing (1a), two electric terminals (1g) being electrically connected to the first current terminal (1b1) and the second current terminal (1b2), respectively.

7. A DC contactor according to claim 1, wherein the pressure reducing assembly (2) comprises a cylinder (2a), a piston head (2b), a regulating disc (2c) and a spring (2d), a first channel (2a1), a second channel (2a2) and a third channel (2a3) are arranged in the cylinder (2a) from top to bottom in sequence, the first channel (2a1), the second channel (2a2) and the third channel (2a 8296) are coaxial with the cylinder, the piston head (2b) is arranged in the second channel (2a2) in a sliding manner, the piston head (2b) abuts against the stepped surfaces of the first channel (2a1) and the second channel (2a2), the bottom end of the piston head (2b) is provided with a plug cylinder (2b1) coaxial with the piston head, the regulating disc (2c) is arranged in the third channel (2a3) in a coaxial manner, a vent hole (462 c) communicated with the outside of the third channel (2a3) is arranged on the regulating disc (2c), the top end of the adjusting disc (2c) is provided with a positioning rod (2c2) which is coaxial with the adjusting disc, and the positioning rod (2c2) extends into the plug cylinder (2b1) and is in sliding fit with the plug cylinder; the spring (2d) is coaxially arranged in the plug cylinder (2b1), and two ends of the spring (2d) are respectively abutted against the top end of the inner cavity of the plug cylinder (2b1) and the top end of the positioning rod (2c 2).

8. A DC contactor according to claim 7, characterized in that the top edge of the piston head (2b) has a conical surface (2b2) coaxially abutting in the first channel (2a 1).

9. A DC contactor according to claim 7, characterized in that the adjusting disk (2c) is screwed coaxially in the third channel (2a 3).

10. A DC contactor according to claim 7, characterized in that the piston head (2b) is provided with a sealing ring (2b3) which is in interference fit with the second passage (2a 2).