KR101934296B1

KR101934296B1 - Magnetic Switch for Adjusting Over Travel

Info

Publication number: KR101934296B1
Application number: KR1020150051872A
Authority: KR
Inventors: 박진희
Original assignee: 엘에스산전 주식회사
Priority date: 2015-04-13
Filing date: 2015-04-13
Publication date: 2019-01-02
Also published as: KR20160121961A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switch capable of overtravel control, and more particularly, to an electromagnetic switch capable of overtravel control by adjusting the length of a movable axis.
An electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention includes a frame; A pair of fixed contacts fixedly coupled to the frame and connectable to an external power source or a load; A movable contact which is installed inside the frame so as to be linearly movable and can be brought into contact with or separated from the fixed contact; A fixed core disposed at a predetermined distance from the movable contact; An outer movable shaft slidably installed in the fixed core, the outer movable shaft including a hollow portion along a central axis and including a plurality of outer pinholes; An inner movable shaft slidably installed in the hollow portion, the inner movable shaft including a plurality of inner pin holes; And a shaft pin inserted into and coupled to one of the plurality of external pin holes and one of the plurality of internal pin holes.

Description

{Magnetic Switch for Adjusting Over Travel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switch capable of overtravel control, and more particularly, to an electromagnetic switch capable of overtravel control by adjusting the length of a movable axis.

Generally, Magnetic Switch or Direct Current Relay is a type of electric circuit switching device that transmits mechanical signal and current signal using the principle of electromagnet. It is installed in various industrial equipments, machines and vehicles do. Particularly, the relays for electric vehicles are located in battery systems of electric vehicles such as hybrid cars, fuel cell cars, golf carts and electric forklifts, and serve to open and close the main current.

In addition, in an eco-friendly power generation system such as a photovoltaic power generation system and a wind power generation system, an electromagnetic switch for opening and closing a direct current power is provided between a direct current generator and an inverter for converting direct current power into direct current power of a commercial frequency and voltage, It also functions to supply or block the DC power to the inverter.

FIG. 1 is a longitudinal sectional view of an electromagnetic switch according to the prior art, and FIG. 2 is a partial detail view of the movable assembly in FIG. FIG. 3 is an exploded perspective view of FIG. 2. FIG.

1 to 3, the construction and manufacturing process of a moving assembly of an electromagnetic switch are as follows. The arc chamber 2 provided with the fixed contact 1, the movable shaft assembly 4 provided with the movable contact 3, the plate 5, the stationary core 6 and the movable core 7 are sequentially stacked , And the lower end of the movable shaft 8 is completely fixed to the movable core 7 by laser welding. Further, the upper arc chamber 2 is laser welded to the plate 5 to completely seal the space in which the stationary contact 1 and the movable contact 3 are operated. The fixed core 6 and the movable core 7 are covered with the cylinder 9 and the cylinder 9 is hermetically welded to the lower portion of the plate 5. [

The magnetic switch generates magnetic flux in the plate 5, the yoke 5b, the movable core 7 and the fixed core 6 by the magnetic field generated in the coil 5a. At this time, The movable core 7 is attracted to the fixed core 6 and the movable shaft 8 fixed to the movable core 7 moves together to push up the movable contact 3 coupled to the upper portion of the movable shaft 8 And contacts the fixed contact 1 to cause energization.

What is important in such an electromagnetic switch is the contact pressure of the movable contact 3 which contacts the stationary contact 1. To this end, the moving distance of the movable contact 3 is made smaller than the moving distance of the movable core 7, so that the contact pressure is applied to the movable contact 3 by the contact pressure spring 4a.

At this time, if the distance between the movable core 7 and the fixed core 6 is referred to as a stroke and the distance between the movable contact 3 and the fixed contact 1 is defined as a gap Gap, Travel (OT) is defined as the distance obtained by subtracting the gap (G) from the stroke (S). That is, O.T = S - G. After manufacturing the movable assembly, the over travel is measured. The amount of over travel (length, distance) is determined according to the capacity of the product.

However, in the prior art, when the over travel (over travel distance) is not formed within the specification range and the contact pressure is in an excess or deficiency state, the entire product must be disposed of and the interval between the contact points There is a problem in that no configuration is provided to control this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electromagnetic switch capable of overtravel control by adjusting the length of a movable shaft.

An electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention includes a frame; A pair of fixed contacts fixedly coupled to the frame and connectable to an external power source or a load; A movable contact which is installed inside the frame so as to be linearly movable and can be brought into contact with or separated from the fixed contact; A fixed core disposed at a predetermined distance from the movable contact; An outer movable shaft slidably installed in the fixed core, the outer movable shaft including a hollow portion along a central axis and including a plurality of outer pinholes; An inner movable shaft slidably installed in the hollow portion, the inner movable shaft including a plurality of inner pin holes; And a shaft pin inserted into and coupled to one of the plurality of external pin holes and one of the plurality of internal pin holes.

Here, the interval between the internal pinholes is wider or narrower than the interval between the external pinholes.

Also, the interval between the inner pinholes and the interval between the outer pinholes are uniformly formed.

In addition, a movable contact mounting portion formed in a box shape having left and right openings is provided on the upper portion of the external movable shaft.

In addition, the movable contact is mounted on the upper surface of the movable contact mounting part so as to contact the movable contact, and a contact spring is provided between the movable contact and the lower surface of the movable contact mounting part.

Further, a plurality of annular ribs are formed on the outer peripheral surface of the outer movable shaft.

The inner movable shaft may include an upper body, an intermediate body, and a lower body, and the upper body and the lower body may have a smaller diameter than the middle body.

The movable core further includes a movable core provided at a lower portion of the fixed core, wherein the movable movable shaft can be inserted.

In addition, the middle portion of the lower body is formed with a step to which the upper surface of the movable core can be coupled.

In addition, a locking pad for supporting the inner movable shaft is provided at a lower portion of the movable core.

A circumferential groove is formed at a lower end of the inner movable shaft, and a protrusion that can be inserted into the circumferential groove is formed in the locking pad.

According to the electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention, the amount of over travel of the electromagnetic switch can be adjusted by adjusting the length of the movable shaft. Accordingly, when an error of the contact pressure necessary for each product is generated, it can be corrected.

In addition, the contact pressure can be adjusted in response to malfunction or deterioration of parts.

In addition, it is possible to prevent the entire movable assembly from being discarded due to poor contact pressure.

1 is a longitudinal sectional view of an electromagnetic switch according to the prior art.
Figure 2 is a partial detail view of the movable assembly in Figure 1;
FIG. 3 is an exploded perspective view of FIG. 2. FIG.
4 is a longitudinal sectional view of an electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention.
Figure 5 is a perspective view of the movable assembly in Figure 4;
FIG. 6 is an exploded perspective view of FIG. 5. FIG.
7 is an exploded perspective view of the movable shaft assembly shown in FIG.
8A, 8B, and 8C illustrate operation of an electromagnetic switch capable of overtravel control according to an embodiment of the present invention, in which shaft pins are coupled to an upper hole, an intermediate hole, and a lower hole, respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.

4 is a longitudinal sectional view of an electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention. Fig. 5 is a perspective view of the movable assembly in Fig. 4, Fig. 6 is an exploded perspective view of Fig. 5, and Fig. 7 is an exploded perspective view of the movable shaft assembly in Fig. An electromagnetic switch capable of over travel adjustment according to each embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 4, an overview of the present invention will be described. Over travel O.T is defined as a distance obtained by subtracting a gap (Gap, G) from a stroke (S). Here, the stroke S is a distance between the fixed core 20 and the movable core 25, and the gap G is a distance between the fixed contact 11 and the movable contact 15. The overtravel (over travel distance) is represented by the contact pressure applied to the stationary contact 11 by the movable contact 15 via the contact spring 17. At this time, the magnitude of the contact pressure is proportional to the amount of overtravel (O.T) (length, distance). That is, an appropriate overtravel (O.T) value must be maintained to have the appropriate contact pressure required for each product. Here, there may be a method of adjusting the gap G with a factor that can control the length of the overtravel O.T and a method of adjusting the stroke S. The present invention is a configuration using a method of adjusting the gap (G).

4 to 7, an electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention includes a frame 10; A pair of stationary contacts (11) fixedly coupled to the frame (10) and connectable to an external power source or a load; A movable contact 15 installed in the frame 10 so as to be linearly movable and capable of being contacted with or separated from the stationary contact 11; A fixed core (20) installed at a predetermined distance from the movable contact (15); A hollow portion 35 is formed along the central axis of the fixed core 20 so as to be slidable inside the fixed core 20 and an outer pin hole 31a, 31b, 31c, shaft, 30); An inner shaft 40 slidably installed in the hollow portion 35 and including a plurality of inner pin holes 41a, 41b and 41c; And a shaft pin 50 inserted into and connected to any one of the plurality of external pinholes 31a, 31b, and 31c and the internal pinholes 41a, 41b, and 41c.

The frame 10 is formed in a box shape with its bottom surface opened, and is installed on the upper part of the electromagnetic switch.

Fixed contacts 11 are fixed to the frame 10 in a pair.

The movable contact 15 may be composed of a flat plate 15a having a predetermined length and a pair of contact portions 15b capable of being brought into contact with the pair of fixed contacts 11. A through hole 15c is formed in the middle of the movable contact 15.

The fixed core 20 is installed at a predetermined distance from the movable contact 15. The stationary core 20 may be installed at the lower portion of the frame 10. The stationary core 20 may be formed in a cylinder type whose top surface is open. A flange may be formed on the upper portion of the fixed core 20. Here, the flange portion 21 of the fixed core 20 may serve as a plate that is coupled to the lower portion of the frame 10. [ On the lower surface of the fixed core 20, a first shaft hole 22 through which an internal movable shaft 40 to be described later can be inserted is formed.

The movable core 25 is installed at a lower portion of the stationary core 20. The movable core 25 may be formed in a cylinder type whose lower surface is opened. A second shaft hole 25a through which the inner movable shaft 40 can be inserted is formed on the upper surface of the movable core 25. [

A locking pad 26 is provided under the movable core 25. The locking pads 26 may be coupled to the movable core 25 in a fit manner. A protrusion 26a protrudes from the inside of the locking pad 26. [

The external movable shaft 30 is formed as a pipe type body and is slidably installed inside the stationary core 20. [ That is, the external movable shaft 30 is provided with the hollow portion 35 along the central axis.

A plurality of external pinholes 31a, 31b, 31c are formed in the outer movable shaft 30 in a transverse direction (direction perpendicular to the axis). Here, the plurality of external pinholes 31a, 31b, and 31c are illustrated as three for convenience of description, but it is needless to say that the number of the plurality of external pinholes 31a, 31b, and 31c may be more than three. The plurality of external pinholes 31a, 31b and 31c are arranged at predetermined intervals. Preferably, the plurality of external pinholes 31a, 31b, 31c may be arranged at even intervals.

The upper portion of the external movable shaft 30 may be provided with a movable contact mounting portion 32 formed in a box shape having left and right open sides. The movable contact mounting portion 32 is provided with a movable contact 15 and a contact spring 17. The movable contact 15 is elastically supported by the contact spring 17 and is disposed so as to be in contact with the inside of the upper surface of the movable contact mounting portion 32.

The lower surface of the movable contact attachment portion 32 is placed on the flange portion 21 of the fixed core 20 in a state in which no external force is applied.

On the upper surface of the movable contact mounting portion 32, a seating portion 34 capable of fixedly supporting the lower end of the return spring 19 may be formed.

A plurality of annular ribs 33 may be formed on the outer peripheral surface of the outer movable shaft 30. The ribs 33 serve to reinforce the strength of the external movable shaft 30. [ Further, the rib 33 serves to reduce the friction area and guide the movement in the axial direction when the external movable shaft 30 slides inside the fixed core 20.

The inner movable shaft (40) is slidably mounted on the hollow portion (35) of the outer movable shaft (30). The inner movable shaft 40 may be formed in a plurality of stages. For convenience of explanation, each end is roughly divided into an upper body 41, a middle body 42, and a lower body 43.

The upper body 41 is a portion located inside the movable contact attachment portion 32. The upper body 41 may be smaller in diameter than the middle body 42. A contact spring (17) is fitted to the upper body (41).

The intermediate body 42 is a portion constituting a main portion of the inner movable shaft 40. The intermediate body 42 has a plurality of internal pinholes 41a, 41b, and 41c. Here, the plurality of internal pinholes 41a, 41b, and 41c are illustrated as three for convenience of explanation, but it is needless to say that the number of the internal pinholes 41a, 41b, and 41c may be increased. Here, the internal pinholes are preferably formed in the same number as the external pinholes. A plurality of internal pinholes 41a, 41b and 41c are arranged at predetermined intervals. Preferably, the plurality of internal pinholes 41a, 41b, 41c may be arranged at equal intervals.

At this time, the interval between the plurality of internal pinholes 41a, 41b, and 41c may not be equal to the interval between the plurality of external pinholes 31a, 31b, and 31c. In the drawing, an example in which the interval of the plurality of internal pinholes 41a, 41b, 41c is smaller than the interval of the plurality of external pinholes 31a, 31b, 31c is shown. Accordingly, when the inner movable shaft 40 slides inside the outer movable shaft 30, specific holes can communicate with each other. In other words, as the specific holes are brought into communication with each other, the relative positions of the outer movable shaft 30 and the inner movable shaft 40 are changed, so that the entire length of the movable shaft can be adjusted. That is, the length of the entire movable shaft can be adjusted while the outer movable shaft 30 is relatively moved with respect to the inner movable shaft 40.

The lower body 43 may be smaller in diameter than the middle body 42. The lower body 43 is a portion that penetrates the lower surface of the fixed core 20 and is disposed below. A step 43a is formed at the middle portion of the lower body 43 so that the upper surface of the movable core 25 can be engaged.

A circumferential groove 43b is formed in a lower portion of the lower body 43 so that a locking pad 26 can be fitted. The protruding portion 26a of the locking pad 26 is fitted into the circumferential groove 43b of the lower body 43. Thus, the inner movable shaft 40 is fixedly coupled to the movable core 25.

Shaft pins 50 are provided to connect and fix the outer pinholes 31a, 31b and 31c of the outer movable shaft 30 and the inner pinholes 41a, 41b and 41c of the inner movable shaft 40. The shaft pin 50 is installed so as to penetrate through any one of the plurality of external pinholes 31a, 31b and 31c and the plurality of internal pinholes 41a, 41b and 41c, (40).

A return spring 19 is provided between the movable assembly, more precisely between the movable contact mounting portion 32 and the frame 10. The return spring 19 provides an elastic force to lower the movable shaft assembly. Accordingly, when the lifting force of the movable shaft assembly disappears at the time of blocking, the return spring 19 receives the elastic force and the movable core 25 is immediately lowered to a position away from the fixed core 20.

The coil 56 forming the magnetic field by the external power source, the yoke 55 forming the path of the magnetic flux generated by the magnetic field and the bobbin 57 provided with the coil 56 are the same as those of the prior art, Is omitted.

8A, 8B and 8C are diagrams illustrating an operation of an electromagnetic switch capable of overtravel control according to an embodiment of the present invention, wherein each shaft pin is an upper pin hole of an inner drive shaft and an outer pin hole of an outer drive shaft, And is coupled to the hole. Referring to FIG. 1 and FIGS. 8A, 8B and 8C, the operation of the electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention will be described.

Here, the height difference between the upper hole 41a of the inner movable shaft 40 and the upper hole 31a of the outer movable shaft 30 is defined as 'd'. Similarly, the height difference between the lower hole 41c of the inner movable shaft 40 and the lower hole 31c of the outer movable shaft 30 is equal to 'd'.

4 and 8A, the shaft pin 50 is coupled to the intermediate hole 41b among the intermediate hole 31b and the plurality of internal pin holes 41a, 41b, and 41c among the plurality of external pin holes 31a, 31b, and 31c Respectively. Here, the overtravel (O.T) is represented by a distance obtained by subtracting the gap (G) from the stroke (S). That is, O.T = S - G. The distance from the lower end of the inner movable shaft 40 to the lower end of the outer movable shaft 30 is defined as h1 and the length of the entire movable shafts 30 and 40 is defined as L1.

8B shows a state in which the shaft pin 50 is coupled to the upper hole 41a among the upper hole 31a and the plurality of internal pin holes 41a, 41b, and 41c among the plurality of external pin holes 31a, 31b, . At this time, the outer movable shaft 30 is lowered by 'd' corresponding to the height difference between the upper hole 41a of the inner movable shaft 40 and the upper hole 31a of the outer movable shaft 30. In this case, the length L2 of the entire movable shafts 30 and 40 is reduced by 'd' from the case L1 in FIG. 8A. Accordingly, the gap between the stationary contact 11 and the movable contact 15 is increased by 'd'. Therefore, O.T = S - G - d. That is, the contact pressure applied by the movable contact 15 to the stationary contact 11 is reduced as compared with the case of Fig. 8A.

8C shows a state in which the shaft pin 50 is coupled to the lower hole 41c among the plurality of external pin holes 31a, 31b and 31c among the lower hole 31c and the plurality of internal pin holes 41a, 41b and 41c. . That is, the outer movable shaft 30 is raised by 'd' corresponding to the difference between the lower hole 41c of the inner movable shaft 40 and the lower hole 31c of the outer movable shaft 30. In this case, the length L3 of the entire movable shafts 30 and 40 is increased by 'd' as compared with the case of Fig. 8A (L1). Accordingly, the distance between the fixed contact 11 and the movable contact 15 is reduced by 'd'. E Therefore, O.T = S - G + d. That is, the contact pressure applied by the movable contact 15 to the stationary contact 11 is increased as compared with the case of Fig. 8A.

The entire length of the movable shafts 30 and 40 is adjusted according to the position where the external movable shaft 30 slides on the internal movable shaft 40 and is fixed by the shaft pin 50. As a result, Accordingly, the magnitude of the contact pressure applied to the stationary contact 11 by the movable contact 15 can be adjusted.

According to the electromagnetic switch capable of over travel adjustment according to an embodiment of the present invention, the amount of over travel of the electromagnetic switch can be adjusted by adjusting the length of the movable shaft. This makes it possible to compensate for differences in the contact pressure caused by component tolerances and assembly tolerances that may occur depending on the product, so that it is possible to reduce the operation error between the products and to perform appropriate blocking performance, thereby standardizing and standardizing the product .

In addition, it is possible to prevent the entire movable assembly from being discarded due to poor contact pressure. This contributes to reduction of production cost and increase of production efficiency.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10 Frame 11 fixed contact
15 movable contact 15a flat plate
15b contact portion 15c through hole
17 Contact spring 19 Return spring
20 fixed core 21 flange portion
22 first shaft hole 25 movable core
25a Second shaft hole 26 Locking pad
26a protrusion 30 outer movable shaft
31a upper hole 31a, 31b, 31c outer pin hole
31b Middle hole 31c Lower hole
32 movable contact mounting 33 rib
34 Seated portion 35 Hollow portion
40 inner movable shaft 41 upper body
41a upper holes 41a, 41b, 41c inner pin holes
41b Middle hole 41c Lower hole
42 intermediate body 43 lower body
43a step 43b circumferential groove
50 Shaft pin 55 yoke
56 coil 57 bobbin
G Gap OT Travel
S stroke

Claims

frame;
A pair of fixed contacts fixedly coupled to the frame and connectable to an external power source or a load;
A movable contact which is installed inside the frame so as to be linearly movable and can be brought into contact with or separated from the fixed contact;
A fixed core disposed at a predetermined distance from the movable contact;
An outer movable shaft slidably installed in the fixed core, the outer movable shaft including a hollow portion along a central axis and including a plurality of outer pinholes;
An inner movable shaft slidably installed in the hollow portion, the inner movable shaft including a plurality of inner pin holes; And
And a shaft pin inserted into and coupled to one of the plurality of external pin holes and one of the plurality of internal pin holes.

The electromagnetic switch as set forth in claim 1, wherein an interval between the inner pinholes is wider or narrower than an interval between the outer pinholes.

The electromagnetic switch as set forth in claim 1, wherein an interval between the internal pinholes and an interval between the external pinholes are uniformly formed.

The electromagnetic switch as set forth in claim 1, wherein a movable contact mounting portion formed in a box shape having left and right openings is provided on the upper portion of the outer movable shaft.

The electromagnetic switch as set forth in claim 4, wherein the movable contact is mounted on the upper surface of the movable contact mounting part so as to contact the movable contact, and a contact spring is provided between the movable contact and the lower surface of the movable contact mounting part. .

The electromagnetic switch according to claim 1, wherein a plurality of annular ribs are formed on an outer circumferential surface of the outer movable shaft.

The electromagnetic switch as set forth in claim 1, wherein the inner movable shaft comprises an upper body, an intermediate body, and a lower body, and the upper body and the lower body are formed smaller in diameter than the middle body.

8. The electromagnetic switch according to claim 7, further comprising a movable core provided at a lower portion of the fixed core, wherein the movable core can be inserted and installed.

9. The electromagnetic switch as set forth in claim 8, wherein an intermediate portion of the lower body is formed with a step to which an upper surface of the movable core can be coupled.

9. The electromagnetic switch according to claim 8, wherein a locking pad for supporting the inner movable shaft is provided at a lower portion of the movable core.

11. The electromagnetic switch according to claim 10, wherein a circumferential groove is formed at a lower end of the inner movable shaft, and a protrusion that can be fitted into the circumferential groove is formed in the locking pad.