CN210516636U

CN210516636U - Small relay capable of meeting creepage distance requirement

Info

Publication number: CN210516636U
Application number: CN201921924520.6U
Authority: CN
Inventors: 高山; 何小兵
Original assignee: Sichuan Hongfa Electroacoustic Co ltd
Current assignee: Sichuan Hongfa Electroacoustic Co ltd
Priority date: 2019-11-09
Filing date: 2019-11-09
Publication date: 2020-05-12
Anticipated expiration: 2029-11-09

Abstract

The utility model discloses a small relay which can meet the creepage distance requirement, the small relay is provided with a coil wound on a coil rack, an iron core positioned in the coil, a yoke connected with the iron core, an armature connected with the yoke, a moving contact and a static contact which are driven by the armature, and a moving spring which enables the armature to reset after the relay is electrified; the coil frame consists of a winding drum, an upper end plate and a lower end plate which are positioned at two ends of the winding drum, two creepage paths are arranged between the coil and the yoke iron, the bottom surface of the upper end plate of the coil frame is a corrugated surface, and the corrugated direction is consistent with the creepage paths, so that the creepage paths from the upper end of the coil to the yoke iron through the bottom surface of the upper end plate of the coil frame are tortuous; an air gap is reserved between the lower end plate of the coil frame and the yoke iron, so that a creepage path from the lower end of the coil to the yoke iron through the top surface of the lower end plate of the coil frame is bent, and the creepage path is bent downwards from the lower end of the coil to the armature through the top surface of the lower end plate of the coil frame and the end surface of the lower end plate of the coil frame.

Description

Small relay capable of meeting creepage distance requirement

Technical Field

The utility model relates to a relay especially relates to a can satisfy creepage distance requirement's miniature relay.

Background

Creepage distance refers to the shortest path between two conducting members along the surface of an insulating material or along the interface of two insulators. In the case of a relay, the creepage distance is the most basic requirement in the safety requirements of the relay, and the creepage distance is a standard to meet, which has a direct relationship with the load voltage and the pollution level of the relay. Wherein the load voltage is determined by the application of the relay. And for the pollution level, the interior of the relay is generally classified as II.

When designing a relay, the creepage distance needs to meet the specified requirements. According to the definition of the creepage distance, the requirement of creepage distance, namely the shortest path between two conductive members along the surface of the insulating material or the joint surface of two insulators, is satisfied. The creepage distance has a larger relation with the size of the relay, and under the condition that the load voltage is not changed, the smaller the geometric dimension of the relay is, the greater the difficulty of meeting the creepage distance is, so when designing a small relay, if the dimension is reduced only in proportion to the dimension of a conventional relay, the creepage distance can not meet the requirement usually, wherein, the creepage distance between the two parts of the coil and the yoke is the shortest, which becomes the biggest difficulty of the structural design of the small relay. As shown in fig. 2: two creepage paths are arranged between the coil 5 and the yoke 3, wherein one creepage path is from the upper end of the coil to the yoke 3 through the bottom surface of the upper end plate of the coil rack 6, and the other creepage path is from the lower end of the coil 5 to the yoke 3 through the top surface of the lower end plate of the coil rack 6, as shown in the thick line part of fig. 2, the two creepage paths are the straight distance from the coil 5 to the yoke 3, and are the shortest creepage distance, namely the creepage distance of the relay, and the creepage distance is also very small because the geometric dimension of the relay is too small, and can not meet the creepage distance requirement specified by the design specification.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem, a miniature relay that can satisfy creepage distance requirement is provided.

The technical solution of the utility model is that:

a small relay capable of meeting the creepage distance requirement is provided with a coil wound on a coil rack, an iron core positioned in the coil, a yoke iron connected with the iron core, an armature connected with the yoke iron, a moving contact and a static contact which are driven by the armature, and a moving spring which enables the armature to reset after the relay is de-energized; the coil rack is composed of a winding drum, an upper end plate and a lower end plate which are positioned at two ends of the winding drum, two creepage paths are arranged between the coil and the yoke, wherein the first path is from the upper end of the coil to the yoke through the bottom surface of the upper end plate of the coil rack, and the second path is from the lower end of the coil to the yoke through the top surface of the lower end plate of the coil rack; the coil frame is characterized in that the bottom surface of the upper end plate of the coil frame is a corrugated surface, the corrugated direction is consistent with a creepage path, and the creepage path from the upper end of the coil to the yoke iron through the bottom surface of the upper end plate of the coil frame is tortuous; an air gap is reserved between the coil frame lower end plate and the yoke iron, so that a creepage path from the lower end of the coil to the yoke iron through the top surface of the coil frame lower end plate becomes zigzag, and the path is bent downwards from the lower end of the coil to the armature through the top surface of the coil frame lower end plate and then through the end surface of the coil frame lower end plate.

The wave shape of the corrugated surface of the bottom surface of the upper end plate of the coil rack is one of square wave, semicircular wave and sawtooth wave.

The utility model has the advantages that:

the two creepage paths are increased by the structure, and because the second creepage path is longer than the first creepage path, the creepage path with the shortest path is the creepage distance according to the definition of the creepage distance, so that the first creepage path is the creepage distance of the relay, the first creepage path is longer than the path before improvement, and the creepage distance requirement of the relay is met.

Drawings

FIG. 1 is a basic structure diagram of a relay

FIG. 2 is a schematic diagram of two creepage paths from coil to yoke of a conventional relay

FIG. 3 is a schematic diagram of two creepage paths from the relay coil to the yoke of the present invention

Fig. 4 is a perspective view of the bobbin

Reference numbers in the figures: 1-coil leading-out pin, 2-movable spring, 3-yoke iron, 4-iron core, 5-enameled coil, 6-coil rack, 6.1-winding drum of coil rack, 6.2-upper end plate of coil rack, 6.3-lower end plate of coil rack, 7-normally open stationary contact, 8-movable contact, 9-normally closed stationary contact, 10-normally closed stationary reed, 11-normally open stationary reed, 12-bottom plate, 13-armature.

Detailed Description

Referring to fig. 1, the present minirelay has: the coil is led out foot 1, bottom plate 12, coil former 6 arranged on bottom plate 12, coil 5 wound on coil former 6, iron core 4 located in coil 5, yoke 3 connected with iron core 4, armature 13 connected with yoke 3, movable spring 2 driven by armature 13, movable contact 8 on movable spring 2, normally closed stationary reed 10 fixed on coil former 6, normally open stationary reed 11, normally closed stationary reed 10 has normally closed stationary contact 9, normally open stationary reed 11 has normally open stationary contact 7.

Referring to fig. 3, 4: the coil rack 6 is composed of a winding drum 6.1, an upper end plate 6.2 and a lower end plate 6.3 which are positioned at two ends of the winding drum, and two creepage paths are arranged between the coil 5 and the yoke 3, wherein the first creepage path is from the upper end of the coil 5 to the yoke 3 through the bottom surface of the upper end plate 6.2 of the coil rack, and the second creepage path is from the lower end of the coil 5 to the yoke 3 through the top surface of the lower end plate 6.3 of the coil rack.

The utility model has the characteristics of, first route is general the bottom surface design of coil former upper end plate 6.2 is the ripple face, and the ripple direction is unanimous with creepage path, and this ripple can be arbitrary wave forms such as square wave, semicircle ripples, sawtooth wave, and what this example shows is the square wave, and the ripple makes from 5 upper ends of coil through the bottom surface of coil former upper end plate 6.2 to creepage path tortuous of yoke 3, increases creepage path. The second path is a path that an air gap is left between the coil frame lower end plate 6.3 and the yoke 3, so that a creepage path from the lower end of the coil 5 to the yoke 3 through the top surface of the coil frame lower end plate 6.3 becomes zigzag, and the creepage path is increased, and the path is bent downwards from the lower end of the coil 5 to the armature 13 through the top surface of the coil frame lower end plate 6.3 and then through the end surface of the coil frame lower end plate 6.3.

The two creepage paths are shown in the bold line part in fig. 3.

Through adopting above structure, the creepage path has been increased for the creepage distance of relay satisfies the requirement.

It is worth to be noted that, because the second creepage path is longer than the first creepage path, and according to the definition of creepage distance, the creepage path with the shortest path is creepage distance, the first creepage path is creepage distance of the relay, which is longer than the path before improvement, and meets the requirement of creepage distance of the relay.

Claims

1. A small relay capable of meeting the creepage distance requirement is provided with a coil wound on a coil rack, an iron core positioned in the coil, a yoke iron connected with the iron core, an armature connected with the yoke iron, a moving contact and a static contact which are driven by the armature, and a moving spring which enables the armature to reset after the relay is de-energized; the coil rack is composed of a winding drum, an upper end plate and a lower end plate which are positioned at two ends of the winding drum, two creepage paths are arranged between the coil and the yoke, wherein the first path is from the upper end of the coil to the yoke through the bottom surface of the upper end plate of the coil rack, and the second path is from the lower end of the coil to the yoke through the top surface of the lower end plate of the coil rack; the coil frame is characterized in that the bottom surface of the upper end plate of the coil frame is a corrugated surface, the corrugated direction is consistent with a creepage path, and the creepage path from the upper end of the coil to the yoke iron through the bottom surface of the upper end plate of the coil frame is tortuous; an air gap is reserved between the lower end plate of the coil frame and the yoke iron, so that a creepage path from the lower end of the coil to the yoke iron through the top surface of the lower end plate of the coil frame is bent, and the creepage path is bent downwards from the lower end of the coil to the armature through the top surface of the lower end plate of the coil frame and the end surface of the lower end plate of the coil frame.

2. A miniature relay according to claim 1, wherein the wave shape of the corrugated surface of the bottom surface of the upper end plate of the bobbin is one of a square wave, a semicircular wave and a sawtooth wave.