Relay

Abstract

The relay comprises a shell, a bottom cover which is matched with the shell to form a sealed space, a coil rack which is arranged in the sealed space, a movable contact piece assembly and a static contact piece assembly, a communicating hole communicating with the sealed space is formed in the shell, and nitrogen is injected into the sealed space through the communicating hole; the movable contact piece assembly comprises a movable contact piece, a plastic head penetrating through the movable contact piece and a spring pressing the movable contact piece downwards, and the spring is a tower-type spring; the static contact piece assembly comprises a static contact piece and a screw, the static contact piece is arranged in the sealed space, one end of the screw is electrically connected with the static contact piece, the other end of the screw extends out of the sealed space, the static contact piece comprises a body, the body is provided with an installation hole for assembling the screw, the front face and / or the back face of the body are / is provided with a plurality of clamping points, and the clamping points are distributed around the installation hole. And one side of the clamping point protrudes in the mounting hole. Nitrogen is inert gas and has the functions of heat dissipation and arc extinguishing. The tower spring has a compensation balance function; the clamping point can temporarily fix the screw rod and the static contact piece, thereby facilitating subsequent assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to a relay. BACKGROUND

[0002] The existing relay generally comprises a plastic head cover, a shell, a coil holder arranged in the shell, a moving contact piece assembly and a static contact piece assembly. For example, a relay disclosed in CN213877966U comprises an insulating head cover, a static contact point assembly, a moving contact point assembly, a shell, a coil assembly, an iron core and a large magnet plate. The static contact point assembly comprises a screw rod, a static contact piece arranged at the lower end of the screw rod and a nut threadedly connected with the screw rod. The moving contact point assembly comprises a moving contact piece and a plastic head penetrating the moving contact piece. The plastic head is in tight fit with the moving contact piece. One end of the plastic head is arranged in a guide column hole at the bottom of the insulating head cover. A spring is arranged between the moving contact piece and the insulating head cover. The insulating head cover comprises a plastic body and a plurality of top pressing columns arranged at the bottom of the plastic body. The top pressing columns are integrally injection molded with the plastic body. The lower end of the top pressing column is tapered. The lower end of the top pressing column is pressed on the large magnet plate. The existing relay has the following disadvantages: 1. There is no heat dissipation and arc extinguishing mechanism. The overload capacity of the relay is limited, and it cannot meet the requirement of passing large current. 2. The spring cooperating with the moving contact head assembly is a common spring. The diameter of the top ring and the bottom ring of the spring is the same. The balance of this kind of spring is poor. The spring is easily deformed on both sides, and the moving contact head assembly may be stuck due to deviation during lifting. 3. Before being arranged in the shell, the static contact piece assembly and the moving contact piece assembly are arranged on a mold. However, the static contact piece and the screw rod are not tightly fitted. When the moving contact piece assembly and the static contact piece assembly are arranged in the shell, the static contact piece is easily lifted by the spring of the moving contact piece assembly, which causes the static contact piece to be not accurately assembled and brings certain assembly difficulty. SUMMARY

[0003] The utility model solves the technical problems existing in the prior art.

[0004] To solve the above technical problems, the technical scheme of the utility model is: a relay, including shell, bottom cover that cooperates with shell and forms sealed space, coil holder that is arranged in sealed space, moving contact piece assembly and static contact piece assembly, the shell is equipped with the communicating hole that communicates with sealed space, is equipped with the stopper at the communicating hole, is equipped with nitrogen in sealed space, the moving contact piece assembly is arranged in sealed space, and it includes moving contact piece, plastic head that passes through moving contact piece and spring that presses down tightly moving contact piece, the spring is tower spring, and the bottom ring diameter of spring is less than top ring diameter, the static contact piece assembly includes static contact piece and screw rod, the static contact piece is arranged in sealed space, one end of screw rod is electrically connected with static contact piece, and the other end stretches out sealed space, the static contact piece includes body, the body is equipped with the mounting hole that is used for screw rod assembly, the front and / or back of body is equipped with a plurality of clamping points, the clamping point is distributed around mounting hole, and one side of clamping point projects in mounting hole.The utility model principle: 1, after the relay assembly is completed, nitrogen is injected to the inside of relay by utilizing the communicating hole, then the communicating hole is sealed by stopper, can guarantee that nitrogen can be kept in the relay for a long time, nitrogen is inert gas, has the effect of heat dissipation and arc extinguishing;2, moving contact piece assembly adopts tower spring reset, and the stability of inverted triangular structure of tower spring is good, has compensation balance function, automatic repair centering, guarantees that moving contact piece assembly lifts stably;3, set up clamping point on static contact piece, clamping point not only does not affect the function of static contact piece, but also can temporarily fix screw rod and static contact piece after screw rod is inserted into mounting hole, and subsequent assembly is convenient.

[0005] As an improvement, the input end of the communicating hole is in the shape of a tapered hole.

[0006] As an improvement, the inner wall of the shell is provided with a clamping groove, and the coil holder is provided with a clamping leg matched with the clamping groove.

[0007] As an improvement, the moving contact piece is a high-conductivity copper piece, and the plastic head is a high-temperature-resistant plastic piece.

[0008] As an improvement, the plastic head includes a disc arranged at the bottom of the moving contact piece, a pushing protrusion arranged at the bottom of the disc, and a connecting protrusion arranged at the top of the moving contact piece, and the lower end of the spring is sleeved on the connecting protrusion.

[0009] As an improvement, the clamping point is a spherical cap-shaped protrusion arranged on the front and / or back of the body.

[0010] As an improvement, the clamping point is a protrusion caused by the deformation of the inner wall of the mounting hole due to the arrangement of a groove on the front and / or back of the body.

[0011] As an improvement, the front and / or back of the body is provided with three clamping points uniformly distributed in a circle.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] After the relay is assembled, nitrogen is injected into the relay through the connecting hole, and then the connecting hole is sealed with a plug to ensure that nitrogen can remain in the relay for a long time. Nitrogen is an inert gas and has the functions of heat dissipation and arc extinguishing.

[0014] The moving contact assembly adopts a tower spring reset. The inverted triangular structure of the tower spring has good stability, compensation and balance function, automatic centering repair, and ensures smooth lifting and lowering of the moving contact assembly.

[0015] Setting locking points on the stationary contact plate not only does not affect the function of the stationary contact plate, but also temporarily fixes the screw to the stationary contact plate after the screw is inserted into the mounting hole, which facilitates subsequent assembly. Attached Figure Description

[0016] Figure 1 This is a 3D diagram of a relay.

[0017] Figure 2 This is a cross-sectional view of a relay.

[0018] Figure 3 This is a cross-sectional view of the relay moving contact assembly.

[0019] Figure 4 This is a schematic diagram of the relay moving contact assembly.

[0020] Figure 5 This is a schematic diagram of the relay stationary contact assembly.

[0021] Figure 6 This is a schematic diagram of a stationary contactor. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 , 2 As shown, a relay includes a housing 1, a bottom cover 2 that cooperates with the housing 1 to form a sealed space, a coil frame 6 disposed in the sealed space, a moving contact assembly 4, and a stationary contact assembly 5.

[0024] like Figure 5 , 6As shown, the static contact piece assembly 5 is arranged on both sides of the dynamic contact piece assembly 4, the static contact piece assembly 5 comprises a static contact piece 51 and a screw rod 52 electrically connected with the static contact piece 51, the static contact piece 51 is arranged in the sealed space, and one end of the screw rod 52 extends out of the top of the shell 1. The static contact piece 51 comprises a body 510, the body 510 is a copper sheet, and the body 510 is electrically connected with the screw rod 52; the body 510 is provided with a mounting hole 511 for assembling the screw rod 52, the mounting hole 511 is a circular hole; one side of the body 510 is provided with an arc-shaped groove 512, the arc-shaped grooves 512 of two static contact pieces 51 are oppositely arranged, and a space formed between the two arc-shaped grooves 512 accommodates the push part of the dynamic contact piece assembly 4; the front and / or back of the body 510 is provided with three clamping points 513 uniformly distributed in a circle, one side of the clamping point 513 protrudes in the mounting hole; the clamping point 513 is a spherical cap-shaped protrusion arranged on the front and / or back of the body, the protrusion is integrally formed with the body, or the clamping point 513 is a protrusion caused by the deformation of the inner wall of the mounting hole due to the groove arranged on the front and / or back of the body, the protrusion is formed by later stamping processing; one side of the clamping point 513 protruding is in a circular arc shape, the friction is small, the difficulty of screwing the screw rod into the mounting hole is reduced, and the screw rod can be prevented from being separated from the constraint of the mounting hole to a certain extent. The clamping point arranged on the static contact piece not only does not affect the function of the static contact piece, but also can temporarily fix the screw rod and the static contact piece after the screw rod is inserted into the mounting hole, which is convenient for subsequent assembly.

[0025] As Figure 3 , 4As shown, the moving contact assembly 4 is arranged in the sealed space, which comprises a moving contact 41, a plastic head 42 penetrating through the moving contact 41 and integrated with the moving contact 41, and a spring 43 pressing the moving contact 41. The center of the coil holder 6 is provided with an iron core 7, the coil holder 6 is wound with a coil, and the iron core 7 can act on the plastic head 42 to drive the moving contact 41. The moving contact 41 and the plastic head 42 are formed by in-mold injection, and the two are firmly combined and have good durability; the moving contact 41 is a high-conductivity copper sheet, and the plastic head 42 is a high-temperature-resistant plastic part, which can enhance the overload capacity of the relay and allow the relay to pass through a larger current; the moving contact 41 is circular, the plastic head 42 penetrates through the center of the moving contact 41, the plastic head 42 comprises a disc 421 arranged at the bottom of the moving contact 41, a pushing protrusion 422 arranged at the bottom of the disc 421, and a connecting protrusion 423 arranged at the top of the moving contact 41, the lower end of the spring 43 is sleeved on the connecting protrusion 423, the iron core 7 acts on the pushing protrusion 422, the connecting protrusion 423 serves to fix the lower end of the spring 43 and keeps the spring 43 in the central position of the moving contact. The spring 43 is a tower spring, the bottom ring diameter of the spring is smaller than the top ring diameter, and the diameter of the low ring is slightly larger than the diameter of the connecting protrusion 423. The principle of the utility model is that the moving contact assembly adopts tower spring reset, the inverted triangular structure of the tower spring has good stability, has a compensation balance function, automatically repairs the centering, and ensures that the moving contact assembly stably rises and falls.

[0026] As shown in Figure 1 , 2 , the bottom cover 2 is ultrasonically welded with the shell 1, the shell 1 comprises a head at the top and a side wall around the head, the moving contact assembly 4 and the static contact assembly 5 are arranged on the inner side of the head, and a screw rod extends from the head; the inner wall of the shell 1 is provided with a clamping groove 11, the coil holder 6 is provided with a clamping leg 61 matched with the clamping groove 11, and the coil holder 6 and the shell 1 are fixedly matched. The head of the shell 1 is provided with a communication hole 3 communicating with the sealed space, a plug is arranged at the communication hole 3, nitrogen is arranged in the sealed space, and the nitrogen is injected through the communication hole 3; the input end of the communication hole 3 is in the shape of a tapered hole, the tapered hole is butt-jointed with an injection nozzle, and the tapered hole plays a role of positioning and increasing the contact area. After the relay is assembled, the communication hole is used to inject nitrogen into the relay, then the communication hole is plugged with the plug to realize sealing, so that the nitrogen can be stored in the relay for a long time, the nitrogen is an inert gas and has the functions of heat dissipation and arc extinguishing.

Claims

1. A relay comprising a housing, a bottom cover cooperating with the housing to form a sealed space, a coil holder provided in the sealed space, a movable contact assembly, and a stationary contact assembly, characterized in that: The shell is provided with a communication hole in communication with a sealed space, the communication hole is provided with a plug, and the sealed space is provided with nitrogen; the movable contact assembly is arranged in the sealed space and comprises a movable contact, a plastic head penetrating the movable contact, and a spring pressing the movable contact downward, the spring is a tower spring, the bottom ring diameter of the spring is smaller than the top ring diameter; the stationary contact assembly comprises a stationary contact and a screw rod, the stationary contact is arranged in the sealed space, one end of the screw rod is electrically connected with the stationary contact, and the other end of the screw rod extends out of the sealed space, the stationary contact comprises a body, the body is provided with a mounting hole for assembling the screw rod, the front surface and / or the back surface of the body is provided with a plurality of clamping points, the clamping points are distributed around the mounting hole, and one side of the clamping points protrudes into the mounting hole.

2. A relay according to claim 1, characterized in that: The input end of the communication hole is in the shape of a tapered hole.

3. A relay according to claim 1, characterized in that: The inner wall of the shell is provided with a clamping groove, and the coil support is provided with a clamping leg matched with the clamping groove.

4. A relay according to claim 1, characterized in that: The movable contact is a high-conductivity copper sheet, and the plastic head is a high-temperature-resistant plastic part.

5. A relay according to claim 1, characterized in that: The plastic head comprises a disc arranged at the bottom of the movable contact, a pushing protrusion arranged at the middle of the bottom of the disc, and a connecting protrusion arranged at the middle of the top of the movable contact, and the lower end of the spring is sleeved on the connecting protrusion.

6. A relay according to claim 1, characterized in that: The clamping points are spherical cap-shaped protrusions arranged on the front surface and / or the back surface of the body.

7. A relay according to claim 1, characterized in that: The clamping points are protrusions caused by the deformation of the inner wall of the mounting hole due to the grooves arranged on the front surface and / or the back surface of the body.

8. A relay according to claim 1, characterized in that: The front surface and / or the back surface of the body is provided with three clamping points uniformly distributed in the circumference.

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