KR102643124B1 - Protector - Google Patents

Abstract

The present invention relates to an overload protection device, and more specifically, to effectively prevent external foreign substances, including a sealing block, from entering the device, while also preventing materials constituting the sealing block from flowing into the device. It is about an overload protection device that can prevent malfunction.

Description

Overload protection device {PROTECTOR}

The present invention relates to an overload protection device, and more specifically, to effectively prevent external foreign substances, including a sealing block, from entering the device, while also preventing materials constituting the sealing block from flowing into the device. It is about an overload protection device that can prevent malfunction.

The overload protection device used in compressors such as conventional refrigerators or freezers has a resistance heating element, and when the load current flowing into the compressor motor generates heat in the resistance heating element and reaches a preset temperature of the bimetal, the bimetal is deformed. Accordingly, it is configured to block the electrical connection.

If various foreign substances such as dust enter this overload protection device, accidents such as device failure or explosion may occur. Accordingly, various technologies for sealing the outer surface of the overload protection device have been developed.

However, during the process of sealing the exterior of the overload protection device, sealing material may flow into the device, resulting in product defects or accidents.

Therefore, there is a need to develop technology to prevent such defects and accidents.

Public Utility Model No. 20-2016-0001964

The present invention was developed to solve the above-described problems, and can effectively prevent external foreign substances, including sealing blocks, from entering the device, while also preventing materials constituting the sealing block from flowing into the device. , the purpose is to provide an overload protection device that can prevent malfunctions.

An overload protection device according to an embodiment of the present invention includes a casing having a space portion with an opening formed on one side; a base member having a mounting space; a variable lid mounted within the mounting space; a variable member mounted within the mounting space and disposed below the variable lid; and a sealing block; wherein the variable lead includes a fixed contact point and a movable contact point, and the base member includes a base body made of an insulating material, and a lead part coupled to the base body and having electrical conductivity; , the lead portion includes a first lead portion and a second lead portion each composed of a conductive line, one end of the first lead portion is a fixed terminal fixedly bonded to the fixed contact point of the variable lead, and the other end is a predetermined terminal. A first external connection terminal connected to a first external cable, one end of the second lead portion is a variable terminal selectively connected to the movable contact point, and the other end is a second external connection connected to a predetermined second external cable. It is a terminal, and the variable member is transformed into a first shape or a second shape depending on the ambient temperature, and when the variable member is in the first shape, the movable contact point and the second lead portion come into contact with the first external cable and the second lead portion. The external cable is electrically connected, and when the variable member is in the second shape, the movable contact point and the second lead part are spaced apart, the first external cable and the second external cable are electrically blocked, and the sealing block is, A coupling module in which a base, a variable lead, and a variable member are combined is buried in the space through the opening, and then a predetermined liquid material is injected into the space and then hardened.

In the overload protection device according to an embodiment of the present invention, the base body includes a sealing portion provided on a circumferential surface of the base body and in close contact with the inner surface of the casing, and the sealing portion contains a liquid material constituting the sealing block. It has a configuration that prevents it from flowing between the base body and the casing.

In the overload protection device according to an embodiment of the present invention, the sealing portion is disposed at the rear end of the base body and protrudes outward from the base body, and is disposed between the mounting space and the sealing dam. It has a double structure including a sealing step surrounding the rear end of the space.

In the overload protection device according to an embodiment of the present invention, the variable reed includes a protruding head located between the fixed contact point and the movable contact point and protruding downward, and the variable member is changed from a first shape to a second shape. When deformed, the variable member pushes the protruding head upward to deform the variable reed.

In the overload protection device according to an embodiment of the present invention, a bent portion is formed between the fixed contact point and the protruding head, and when the fixed contact point is bonded to the fixed terminal, a gap between the fixed contact point and the bent portion is predetermined. It consists of a slope portion with an inclination angle of .

In the overload protection device according to an embodiment of the present invention, the fixed terminal is provided with a bonding protrusion that protrudes with the predetermined height, the fixed contact point is bonded to the bonding projection, and the upper end of the bonding projection is , is located at a higher position than the bottom of the protruding head.

In the overload protection device according to an embodiment of the present invention, the casing is provided with a connection hook that can be connected to the outside.

According to the present invention, external foreign substances can be prevented from entering the device, and at the same time, the inflow of liquid substances constituting the sealing block can be effectively prevented, thereby reducing the possibility of product defects.

Additionally, according to the present invention, by shortening the distance between the variable lead and the variable member, the operational reliability of the product can be improved and the defect occurrence rate can be lowered.

1 is a diagram showing the appearance of an overload protection device according to an embodiment of the present invention.
Figure 2 is a diagram showing the cross-sectional structure of an overload protection device according to an embodiment of the present invention.
Figures 3 and 4 are diagrams showing the configuration of a combination body in which the base member, variable lead, and variable member of an overload protection device according to an embodiment of the present invention are combined.
Figure 5 is a diagram showing the combined structure of an overload protection device according to an embodiment of the present invention.
6 and 7 are diagrams showing the structure of the base member of an overload protection device according to an embodiment of the present invention.
Figure 8 is a diagram showing the cross-sectional structure of a variable lead of an overload protection device according to an embodiment of the present invention.
Figure 9 is a diagram showing the operation of an overload protection device according to an embodiment of the present invention.
Figure 10 is a diagram showing the structure of the base member of an overload protection device according to an embodiment of the present invention.
Figure 11 is a diagram showing the coupling structure between the casing and the base member of the overload protection device according to an embodiment of the present invention.
Figure 12 is a diagram showing the structure of a variable lead of an overload protection device according to an embodiment of the present invention.
13 and 14 are diagrams comparing a variable lead according to one embodiment of the present invention with a variable lead according to another embodiment.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the attached drawings.

1 is a diagram showing the appearance of an overload protection device according to an embodiment of the present invention. Figure 2 is a diagram showing the cross-sectional structure of an overload protection device according to an embodiment of the present invention. Figures 3 and 4 are diagrams showing the configuration of a combination V in which the base member 200, the variable lead 300, and the variable member 400 of the overload protection device according to an embodiment of the present invention are combined. Figure 5 is a diagram showing the combined structure of an overload protection device according to an embodiment of the present invention. 6 and 7 are diagrams showing the structure of the base member 200 of the overload protection device according to an embodiment of the present invention. Figure 8 is a diagram showing the cross-sectional structure of the variable lead 300 of the overload protection device according to an embodiment of the present invention. Figure 9 is a diagram showing the operation of an overload protection device according to an embodiment of the present invention.

The overload protection device according to an embodiment of the present invention includes a casing 100, a base member 200, a variable lid 300, a variable member 400, and a sealing block 500.

<Casing (100)>

The casing 100 constitutes the exterior of the overload protection device. According to the embodiment, the casing 100 may have an overall hexahedral shape, but is not limited thereto. The casing 100 has a space portion 110 composed of a space of a predetermined volume. The casing 100 has an opening 112 on one side, and the space 110 can be opened through the opening 112.

A connection hook 120 may be provided on one side of the casing 100. The connection hook 120 can be used to install the overload protection device according to the present invention on a wall, other devices, etc. Therefore, the overload protection device according to the embodiment of the present invention can be easily installed.

<Base member (200)>

The base member 200 may be a block-shaped member on which the variable lead 300 and the variable member 400, which will be described later, can be mounted. The base member 200 may have a shape that can be inserted into the space 110 of the casing 100.

Specifically, the base member 200 may include a block-shaped base body 202 made of an insulating material, and a lead portion 204 that is coupled to the base body 202 and has electrical conductivity.

The base body 202 has a mounting space 210. Specifically, the mounting space 210 includes a first space 212 in which the deformable member 400 can be placed, a second space 214 formed in front of the first space 212, and the first space. It may include a third space 216 formed behind (212). The first space 212, second space 214, and third space 216 may communicate with each other. Specifically, the first space 212 may be composed of a depressed area where a portion of the upper surface of the base body 202 is depressed in a circular shape. The second space 214 and the third space 216 are each formed on the upper surface of the base body 202, and the front and rear portions of the first space 212 may be composed of a depressed area. .

The lead portion 204 may include a first lead portion 220 and a second lead portion 230. As shown in FIG. 7, the first lead portion 220 and the second lead portion 230 may be composed of conductive lines made of a conductive material. According to one embodiment, the lid portion 204 may be embedded in the base member 200 and form an integral part with the base member 200. According to another embodiment, the lead portion 204 is provided as a separate component from the base member 200 and may be fixed to the base member 200.

One end of the first lead portion 220 is located in the second space 214 and may be exposed upward. One end of the first lead portion 220 is connected to the fixed contact point 310 of the variable lead 300 and may be called a fixed terminal 222. According to a specific embodiment, the fixed terminal 222 may be provided with a joining protrusion 224 that protrudes by a predetermined height. The other end of the first lead portion 220 may be located on one side of the rear end of the base member 200. The other end of the first lead portion 220 may be connected to a first external cable L1. Accordingly, the other end of the first lead portion 220 is a first external connection terminal and may be an input/output terminal through which a predetermined electric signal is input/output through the first external cable L1.

One end of the second lead portion 230 is located in the third space 216 and may be exposed upward. One end of the second lead portion 230 is connected to the movable contact point 320 of the variable lead 300 and may be called a variable terminal 232. According to an embodiment, the variable terminal 232 may be provided with a three-dimensional first contact pad 234 that protrudes at a predetermined height.

The other end of the second lead portion 230 may be located on the other rear end of the base member 200. The other end of the second lead portion 230 may be connected to a second external cable L2. Accordingly, the other end of the second lead portion 230 is a second external connection terminal and may be an input/output terminal through which a predetermined electric signal is input/output through the second external cable L2.

Accordingly, if the other end of the first lead part 220 is an input terminal, the other end of the second lead part 230 may be an output terminal. Of course, the opposite is also possible.

<Variable lead (300)>

The variable lead 300 is a beam-shaped member with a predetermined length. The variable lid 300 is mounted within the mounting space 210. Specifically, one end of the variable lead 300 may be located in the second space 214 and the other end may be located in the third space 216. Accordingly, the variable lead 300 may be disposed in the form of a beam crossing the first space 212 in the front-to-back direction. The variable lead 300 may be made of a material that has both electrical conductivity and elastic recovery (deformation recovery).

The variable reed 300 has a predetermined shape, but is deformed when an external force is applied, and can be restored to its original shape when the external force is removed. According to the embodiment, one end of the variable lead 300 may be configured as a fixed contact point 310 that is fixedly connected to the base member 200 (specifically, the first lead part 220). In addition, the other end of the variable reed 300 contacts the base member 200 (specifically, the second lead portion 230) when there is no external force, and contacts the base member 200 (specifically, the second lead portion 230) when an external force is applied. is spaced apart from the second lead portion 230, and may be composed of a movable contact point 320 that contacts the base member 200 (specifically, the second lead portion 230) again when the external force is removed. .

The specific form of the fixed contact point 310 is described as follows. One end of the variable lead 300 is composed of a fixed contact point 310. The fixed contact point 310 is fixedly connected to the fixed terminal 222 of the first lead portion 220. According to the embodiment, the fixed contact point 310 is located on the bonding protrusion 224 formed on the fixed terminal 222 of the first lead portion 220 and can be fixedly joined to the bonding protrusion 224. there is.

The specific form of the movable contact point 320 is described as follows. When an external force is applied to the variable reed 300, the variable reed 300 is deformed. When the variable reed 300 is deformed, the other end of the variable reed 300 is displaced, and the other end of the variable reed 300 is configured as a movable contact point 320. The movable contact point 320 is located on the first contact pad 234 provided on the variable terminal 232 of the second lead portion 230. Specifically, the movable contact point 320 may be provided with a second contact pad 330 having a predetermined three-dimensional shape.

When no external force is applied to the variable lead 300, the second contact pad 330 maintains contact with the first contact pad 234. That is, the electrical connection between the first contact pad 234 and the second contact pad 330 is maintained. Accordingly, electricity may be passed between the first external cable L1 and the second external cable L2.

When an external force is applied to the variable lead 300 and the variable lead 300 is deformed, the second contact pad 330 is spaced apart from the first contact pad 234. Accordingly, the electrical connection between the first contact pad 234 and the second contact pad 330 is interrupted. Accordingly, electricity transmission between the first external cable (L1) and the second external cable (L2) may be blocked.

When the external force is removed and the variable lead 300 is restored to its shape, the second contact pad 330 descends and contacts the first contact pad 234 again. That is, the electrical connection between the first contact pad 234 and the second contact pad 330 is restored.

According to a specific embodiment, the variable lead 300 may include a protruding head 340 that is located between the fixed contact point 310 and the movable contact point 320 and protrudes downward.

The protruding head 340 may be a protrusion that protrudes downward from at least a portion of the variable lead 300. By providing the protruding head 340, the variable lead 300 can be easily deformed by applying an upward external force to the protruding head 340. In addition, when the external force applied to the protruding head 340 is removed, the variable lead 300 can restore its shape. Accordingly, when the variable member 400, which will be described later, applies external force to the variable reed 300 to deform it, it can operate more effectively.

<Variable member (400)>

The variable member 400 is disposed within the mounting space 210 . Specifically, the variable member 400 is located within the first space 212 and is disposed below the variable lid 300.

The variable member 400 is a member that can be deformed and restored to its shape depending on the surrounding temperature. Specifically, the variable member 400 may be made of bimetal. Accordingly, the variable member 400 is in its original form, the first form, when the ambient temperature is below the first predetermined critical temperature, and can be transformed into the second form when the ambient temperature reaches the predetermined first critical temperature. In addition, when the variable member 400 is in the second shape, the shape of the variable member 400 may be restored from the second shape to the first shape when the surrounding temperature reaches a predetermined second critical temperature.

According to an embodiment, the variable member 400 may not apply external force to the variable lead 300 when in the first form. In addition, when the variable member 400 is in the second form, it can deform the variable reed 300 by applying an upward external force to the variable reed 300.

Specifically, the first shape of the variable member 400 may be in the shape of a dish. Additionally, the second shape of the variable member 400 may be an inverted dish shape. In addition, the outer edge of the variable member 400 may be supported by the base member 200. Accordingly, when the variable member 400 is in the first form, the variable member 400 and the variable lead 300 are spaced apart and the variable member 400 does not apply an external force to the variable lead 300. When the variable member 400 is deformed into the second shape, the variable member 400 applies an upward external force to the variable reed 300, and the variable reed 300 may deform.

By having the above configuration, when the variable member 400 is in the first form, the variable member 400 does not apply a force to push and deform the variable reed 300, so the movable contact point 320 and the second lead portion 230 remain in contact.

However, when the variable member 400 is deformed into the second shape, the variable member 400 pushes the variable reed 300 to deform it, so that the movable contact point 320 and the second lead portion 230 are separated.

This will be explained with reference to FIG. 9 as follows. By changing the shape of the variable member 400, the height can be changed as shown by arrow S. Accordingly, when the height of the variable member 400 is variable, the variable lead 300 may be deformed as shown by arrow R. Accordingly, the movable contact point 320 and the second lead portion 230 may be described as being in contact with or spaced apart from each other.

<Sealing block (500)>

The sealing block 500 is installed in the base after the base member 200, the variable lead 300, and the coupling module in which the variable member is combined are buried in the space 110 through the opening 112. It is disposed at the rear of the member 200 to seal the opening 112.

Here, the meaning of block is not necessarily limited to the meaning of a block formed of solid and having a predetermined shape. That is, the sealing block 500 may be made of a soft material suitable for sealing, for example. Block should only be interpreted as a term to describe a sealing block.

Specifically, the sealing block 500 may be formed by injecting a predetermined liquid material into the space 110 and then hardening it. Specifically, the material constituting the sealing block 500 may be a liquid polymer material, and may be hardened by applying a predetermined temperature or exposing the material to air at room temperature. However, it is not limited to this. In addition, the sealing block 500 is not necessarily limited to a liquid material cured, and may also be made of, for example, an epoxy material.

By providing the sealing block 500, external foreign substances, etc. can be prevented from flowing between the casing 100 and the base member 200. For example, if external fine particles enter between the movable contact 320 and the second lead portion 230 through the gap between the casing 100 and the base member 200, malfunction and a risk of fire may occur. The overload protection device according to an embodiment of the present invention can reduce the possibility of such a risk occurring.

Figure 10 is a diagram showing the structure of the base member 200 of the overload protection device according to an embodiment of the present invention. Figure 11 is a diagram showing the coupling structure between the casing 100 and the base member 200 of the overload protection device according to an embodiment of the present invention.

Hereinafter, specific embodiments of the base member 200 and the casing 100 will be described with reference to the drawings.

According to an embodiment of the present invention, the base member 200 may include a sealing portion 240.

The sealing part 240 is provided on the peripheral surface of the base member 200 and may be a part in close contact with the inner surface of the casing 100. The sealing part 240 may have a first three-dimensional part having predetermined protrusions and depressions. In addition, a second three-dimensional part corresponding to the three-dimensional part may be provided on the inner surface of the case. Accordingly, the gap between the outer peripheral surface of the base member 200 and the inner surface of the casing 100 can be sealed with a labyrinth seal structure.

By providing the sealing portion 240 as described above, the material constituting the sealing block 500 can be prevented from flowing between the base member 200 and the casing 100.

That is, when preparing the sealing block 500, the base member 200 is first stored in the space 110 of the casing 100 through the opening 112 of the casing 100, and then the sealing block 500 is stored in the space 110 of the casing 100. ) can be injected into the rear of the base member 200 through the opening 112. During this process, if the liquid material flows into the gap between the base member 200 and the casing 100, product defects may occur. According to an embodiment of the present invention, the provision of the sealing part 240 can prevent the above-mentioned liquid material from flowing into the gap between the base member 200 and the casing 100, thereby increasing the possibility of product defects. This may be lowered.

According to a specific embodiment, the sealing part 240 may have a double structure including a sealing dam 242 and a sealing step 244.

Specifically, the sealing dam 242 is disposed at the rear end of the base member 200 and may have a protrusion that protrudes outward from the base member 200. The sealing dam 242 may be formed over at least a portion of the rear end of the base member 200. According to an embodiment, the sealing dam 242 may have a configuration that protrudes upward from the upper portion of the rear end of the base member 200.

Specifically, the sealing step 244 may be a predetermined step located between the mounting space 210 and the sealing dam 242. Specifically, it may be configured with a predetermined step surrounding the rear end of the mounting space 210.

Additionally, specifically, the second three-dimensional part formed on the inner surface of the casing 100 may be a predetermined multiple three-dimensional part corresponding to the sealing dam 242 and the sealing step 244. That is, predetermined depressions and steps may be provided on the inner surface of the casing 100 to engage with the sealing dam 242 and the sealing step portion 244.

By providing the double-structured sealing portion 240 as described above, the inflow of liquid substances constituting the sealing block 500 can be more effectively prevented, thereby lowering the possibility of product defects.

Figure 12 is a diagram showing the structure of the variable lead 300 of the overload protection device according to an embodiment of the present invention. Figure 13 is a diagram comparing the variable lead 300 according to one embodiment of the present invention with the variable lead 300 according to another embodiment.

Hereinafter, the configuration of the variable lead 300 according to an embodiment will be described.

According to an embodiment, a bent portion 350 may be formed between the fixed contact point 310 and the protruding head 340. In addition, a slope portion 360 having a predetermined inclination angle may be formed between the fixed contact point 310 and the bent portion 350. That is, when no external force is applied to the variable lead 300, the portion between the fixed contact point 310 and the bent portion 350 may be composed of a slope portion 360 whose height decreases toward the rear. there is.

As described above, one end of the first lead portion 220 is a fixed terminal 222 that is joined to the fixed contact point 310, and the fixed terminal 222 may be provided with a joining protrusion 224. . Additionally, according to the embodiment, a first contact pad 234 may be provided at one end of the second lead portion 230. At this time, when the variable lead 300 is connected to the fixed terminal 222 and no external force is applied to the variable lead 300, the first contact pad 234 is connected to the bonding protrusion 224. It can be located in a lower position.

As described above, the variable lead 300 is provided with a slope portion 360, and when no external force is applied to the variable lead 300, the protruding head 340 and the first contact pad 234 By being located at a lower position than the joining protrusion 224, the distance between the protruding head 340 and the variable member 400 can be reduced.

For example, as shown in FIG. 13, when the bend portion 350 and the slope portion 360 are not provided in the variable lead 300, the variable lead 300 and the first lead portion 220 are welded. When doing so, the distance between the variable member 400 and the protruding head 340 of the variable lead 300 may change as the welding electrode located at the top is moved. At this time, a signal is given to the welder to ensure that the predetermined setting value is met to enable welding, but in this process, errors or tolerances may occur in the process, resulting in product defects.

Additionally, in order to ensure operational reliability of the product, it is necessary to shorten the distance between the variable member 400 and the protruding head 340 of the variable lead 300. At this time, as in the embodiment of the present invention, when the variable lead 300 is provided with a bent portion 350 and a joining protrusion 224 and a contact pad are provided, compared to the case where the bent portion 350 is not provided, the variable member ( The distance between 400) and the protruding head 340 may be shortened. Therefore, the operational reliability of the product can be improved and the defect occurrence rate can be lowered.

On the other hand, according to the embodiment of the present invention as shown in FIG. 14, the above problems can be solved. That is, the tolerance between the variable lead 300 and the first lead portion 220 is reduced during the welding process, and the distance between the variable member 400 and the protruding head 340 can be shortened.

Although preferred embodiments have been shown and described above, the present invention is not limited to the specific embodiments described above, and common knowledge in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made by those who have the knowledge, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

100: Casing
110: space part
112: Opening
120: connection hook
200: Base member
202: Base body
204: Lead section
210: Payload space
212: First space
214: Second space
216: Third space
220: first lead unit
222: fixed terminal
224: Junction protrusion
230: second lead unit
232: Variable terminal
234: first contact pad
240: Sealing part
242: Ceiling dam
244: Sealing step portion
300: variable lead
310: fixed contact
320: movable contact
330: second contact pad
340: protruding head
350: bending part
360: slope part
400: variable member
500: Ceiling block

Claims (7)

A casing having a space portion with an opening formed on one side;
a base member having a mounting space;
a variable lid mounted within the mounting space;
a variable member mounted within the mounting space and disposed below the variable lid; and
Includes a ceiling block;
The variable lead includes a fixed contact point and a movable contact point,
The base member is,
A base body made of insulating material,
A lead portion coupled to the base body and having electrical conductivity,
The lead portion includes a first lead portion and a second lead portion each composed of a conductive line,
One end of the first lead portion is a fixed terminal that is permanently bonded to the fixed contact point of the variable lead, and the other end is a first external connection terminal that is connected to a first external cable,
One end of the second lead portion is a variable terminal selectively connected to the movable contact point, and the other end is a second external connection terminal connected to a second predetermined external cable,
The variable member is transformed into a first shape or a second shape depending on the ambient temperature,
When the variable member is in the first shape, the movable contact point and the second lead portion come into contact with each other, and the first external cable and the second external cable are electrically connected,
When the variable member is in the second form, the movable contact point and the second lead portion are spaced apart and the first external cable and the second external cable are electrically disconnected,
The sealing block is,
After the coupling module in which the base, the variable lead, and the variable member are combined is buried in the space through the opening, a predetermined liquid material is injected into the space and then hardened,
The base body is,
It is provided on the circumferential surface of the base body and includes a sealing portion in close contact with the inner surface of the casing,
The sealing unit prevents the liquid material constituting the sealing block from flowing between the base body and the casing,
The sealing part,
A sealing dam disposed at the rear end of the base body and protruding to the outside of the base body, and
An overload protection device having a double structure including a sealing step portion disposed between the loading space and the sealing dam and surrounding a rear end of the loading space. delete delete In claim 1,
The variable lead is,
It is located between the fixed contact point and the movable contact point and includes a protruding head that protrudes downward,
An overload protection device in which, when the variable member is deformed from the first shape to the second shape, the variable member pushes the protruding head upward to deform the variable reed. In claim 4,
Between the fixed contact point and the protruding head
A bend is formed,
An overload protection device comprising a slope portion having a predetermined inclination angle between the fixed contact point and the bent portion when the fixed contact point is joined to the fixed terminal. In claim 5,
The fixed terminal has a joining protrusion that protrudes with the predetermined height,
The fixed contact point is joined to the joining protrusion,
The upper part of the joint protrusion is,
An overload protection device located higher than the bottom of the protruding head. In claim 1,
The casing is,
Overload protection device with a connection hook that can be connected externally.

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