KR20220028453A - Motor protector - Google Patents

Abstract

The present invention relates to an overload protection device of a compressor motor and, more particularly, to an overload protection device of a compressor motor which simplifies manufacturing processes and has high operating accuracy, stability and durability.

Description

Overload protection device for compressor motors {MOTOR PROTECTOR}

The present invention relates to an overload protection device for a compressor motor, and more particularly, to an overload protection device for a compressor motor in which a manufacturing process is simplified and operation accuracy, safety, and durability are high.

A motor protection device used in a compressor such as a conventional refrigerator or freezer includes a variable lead member made of a bimetal and a resistance heating member.

When an excessive current flows through the compressor motor, the resistance heating member on the energizing path generates heat, and when this heat reaches the preset operating temperature of the variable lead member, the variable lead member is deformed and the energization path is blocked, which causes the refrigerator compressor motor to run. will protect

A protection device for a compressor motor according to the prior art includes a terminal member made of two pieces, and a resistance heating member. Such a structure is difficult to respond to a change in the length of the resistance heating structure, deformation of the resistance heating member, or generation of assembly variables due to external pressure.

In addition, since it has a structure in which a plurality of pieces are coupled, it is vulnerable to external insulation, and deformation and assembly variables may occur due to external pressure or the like.

Also, structurally, when the resistance heating member generates heat, deformation may easily occur due to the simultaneous heating of the terminal member, and it may be difficult to accurately control the operating temperature.

In addition, a short circuit between the resistance heating member and the conductive member inside the device, such as a terminal member, may easily occur, and a functional problem may occur.

In addition, the terminal members are exposed inside the device, and the exposed terminal members act to reflect the arc generated when the fixed contact and the variable contact are switched, thereby accelerating the thermal deformation of the device. This may cause malfunction of the device. In addition, heat generated from the resistance heating member is radiated and conducted through the exposed terminal members, thereby reducing the lifespan of the product.

There is a need to develop a protection device that stabilizes the power supply path of the compressor motor protection device, such as a refrigerator or freezer, in a simple form, seals the inside of the device, and secures electrical safety.

Public utility model 2000-0013446

The present invention has been devised to solve the above problems, and an object of the present invention is to provide an overload protection device for a compressor motor that has a simplified manufacturing process, high operational accuracy, safety, and high durability.

In order to achieve the above object, the overload protection device of the compressor motor according to the present invention, a base member composed of an insulating material; a cover member made of a conductive material and coupled to an upper portion of the base member; a terminal member made of a conductive material, at least a portion of which is disposed in the base member and spaced apart from the cover member; a resistance heating member made of a conductive material and disposed within the base member and having an electrical resistance; and a variable lead member disposed between the terminal member and the cover member and configured to open and close an electrical connection between the cover member and the terminal member, wherein the base member includes a lower mounting space with an open top, and the cover The member includes an upper mounting space with an open lower portion, the terminal member includes a first terminal segment and a second terminal segment, and the resistance heating member connects between the first terminal segment and the second terminal segment, , at least a portion of the first terminal segment protrudes to the outside of the base member, and the variable lead member is located in the upper mounting space and connects between the second terminal segment and the cover member, but one end is fixed It is composed of contacts, the other end is composed of movable contacts, is composed of a material having conductivity and elastic restoring force, and is composed of a bimetal whose shape varies according to temperature, and when the shape of the variable lead member is deformed, the position of the movable contact is variable As a result, the electrical connection of the movable contact is opened and closed.

According to an embodiment of the present invention, the base member includes a base body constituting a lower portion, and a fastening body constituting an upper portion and extending laterally than the base body, and the lower portion of the cover member includes the A cover hook to which the fastening body is coupled is provided.

According to an embodiment of the present invention, the lower mounting space is formed in the base body and is formed in a first mounting space in which the resistance heating member is located, and in the fastening body, the first terminal segment and the second terminal segment. and a second mounting space in which is located.

According to an embodiment of the present invention, a front opening portion opened in a front-rear direction is formed on the front side of the fastening body, and at least a portion of the first terminal segment is embedded in the front opening portion, and the first terminal segment is provided through the front opening portion. It protrudes forward of the base member.

According to an embodiment of the present invention, a front insulating part is formed on the upper part of the front opening part, and the front insulating part is located between the first terminal segment embedded in the front opening part and the cover member.

According to an embodiment of the present invention, a rear opening portion opened in a front-rear direction is formed on the rear side of the fastening body, and at least a portion of the second terminal segment is embedded in the rear opening portion.

According to an embodiment of the present invention, a rear insulation portion is formed on the rear opening portion, and the rear insulation portion is located between the second terminal segment embedded in the rear opening portion and the cover member.

According to an embodiment of the present invention, the resistance heating member includes a heating coil wound with a predetermined length, and the variable lead member is located above the heating coil.

According to an embodiment of the present invention, the fixed contact is a part connected to the cover, and the movable contact is a part connected to the second terminal segment.

According to an embodiment of the present invention, a contact block is provided on the second terminal segment, and the movable contact is in contact with the contact block.

According to an embodiment of the present invention, at least a portion of the terminal member may be embedded and fixed in a mold material constituting the base member. In addition, the front end of the variable lead member is configured as a fixed contact and is fixed to the cover. Accordingly, unnecessary contact and electric leakage between various conductive members (such as a terminal member, a resistance heating member, and a variable lead member) disposed in the upper mounting space and the lower mounting space can be prevented. In addition, occurrence of defects due to processing tolerances and the like can be effectively prevented.

According to an embodiment of the present invention, since all parts (terminal member, resistance heating member) are assembled in one base member except for the cover member and the variable lead member, the product is manufactured before the cover member is coupled to the base member to manufacture the finished product. It is possible to judge positive/failure. Therefore, when a defect occurs, rework can be easily performed.

In addition, the cover member includes a cover hook, and the assembly in which the terminal member, the resistance heating member, and the variable lead member are coupled to the base member is simply inserted into the cover hook of the cover member and assembled, so that the process efficiency is improved. can be improved

In addition, front and rear openings are provided at the front and rear of the base member, respectively, and the terminal member is fitted in the front and rear open portions, respectively, so that insulation between the terminal member and the cover member is achieved. Accordingly, the number of parts required for manufacturing the product can be reduced. For example, in accordance with embodiments of the present invention, no parts such as gaskets are required. In addition, since the assembly process is simplified, the process may be simplified and the occurrence of defective products may be reduced. In addition, there is no short circuit even when the resistance heating member touches the inner surface of the base member, and durability against product heat generation is high.

Further, according to the embodiment, the contact block and the contact embossing are provided, and the movable contact of the variable lead member has a configuration capable of contacting the contact embossing, so that the effect of electrical contact between the variable lead member and the second terminal segment is reduced. can be improved

Further, according to the embodiment, at least a portion of the first and second terminal segments constituting the terminal member may be embedded in the base member. In addition, at least one portion of the first and second terminal segments may be sealed by being surrounded by an insulating material constituting the base member.

Accordingly, an area in which the terminal member is unnecessarily exposed inside the base member can be reduced. If the terminal member is excessively exposed in the base member, heat generated in the exposed portion may unintentionally thermally deform the variable lead member. This may prevent variations in the intended precise power and operating temperature. However, according to the present invention, as the terminal member is embedded and sealed in the base member, unnecessary heat exposure as described above is prevented, and overload protection at accurate power and operating temperature can be achieved.

In addition, according to the embodiment, the terminal member composed of a conductor for electrical flow is embedded in the base member composed of an insulating material, sealed and isolated. Accordingly, the phenomenon in which the arc generated when the fixed contact and the movable contact are switched is reflected by the conductor to generate radiant heat can be eliminated. In the conventional case, a predetermined arc may be generated and reflected when the fixed contact and the movable contact of the variable lead member are switched during the operation process. However, in the present invention, the terminal member is embedded in the base member as described above, so that the arc generation and reflection can be prevented.

Also, the present invention can be completely fixed to the terminal member in which the terminal member is an insulator. Accordingly, the terminal member is stably fixed in spite of the deformation of the base member caused by electrical, physical, and thermal shock of the device, and there is an effect of reducing the failure rate of the overall device.

In addition, according to an embodiment, the base member may be manufactured by an insert molding method. That is, the base member may be constituted by positioning the members in a predetermined mold and injecting a plastic casting into the mold so that the terminal member is embedded in the base member as described above. Therefore, it may have a configuration in which the terminal member is embedded in the base member as in the embodiment. Accordingly, the terminal member may be stably fixed to the base member. Accordingly, it is possible to prevent deformation of the product due to the heat generated by the resistance heating member.

According to an embodiment, when the terminal member and the base member are coupled by insert molding, the process of assembling the terminal members for electrical flow into the base member may be omitted. Thus, production automation is possible. Accordingly, there is an effect of reducing the deviation between devices and producing products with uniform characteristics. Further, the present invention does not have a structure in which the terminal member is fitted into the base member, but is constituted by a structure in which the base member and the terminal member are integrated. Accordingly, it is possible to have the effect of reducing the failure of the base member dregs generated when the terminal member is inserted, which is located between the fixed contact and the movable contact and prevents the electrical connection.

In addition, the present invention has the effect of reducing the thermal deformation of the device and ensuring accurate operation by minimizing the radiative conduction of heat generated from the terminal member acting as a heating element by configuring the terminal member to be buried in the base member as described above. That is, the terminal member may be buried in the base member and unnecessary heat transfer may be blocked. Accordingly, as described above, unintentional and unnecessary heat radiation to the variable lead member can be prevented. Therefore, the overload protection device of the compressor motor according to the embodiment of the present invention can be ensured to operate at an accurate operating temperature.

In addition, according to the present invention, the inside of the base member as a whole is sealed with an insulator, and the connection portion between the terminal members can be sealed and isolated. Accordingly, there is an effect of securing safety by preventing an explosion inside the device from causing an external explosion and preventing an external combustible gas from entering the inside.

In addition, the present invention is configured in a form in which the base member is coupled to the cover member, and the cover member covers the base member as a whole and is coupled thereto. Accordingly, the base member and the cover member are firmly coupled, so that the inside of the base member can be reliably sealed. Accordingly, external inflow of water, gas, dust, etc. is prevented, thereby reducing the occurrence rate of product failure.

1 is a view showing an external structure of an overload protection device for a compressor motor according to an embodiment of the present invention.
2 is a view showing a coupling structure of an overload protection device for a compressor motor according to an embodiment of the present invention.
3 is a view showing the structure of a base member of an overload protection device for a compressor motor according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of the base member.
5 is a view showing a structure of a cover member of an overload protection device for a compressor motor according to an embodiment of the present invention.
6 is a view showing a terminal member and a resistance heating member of an overload protection device for a compressor motor according to an embodiment of the present invention.
7 is a view illustrating a variable lead member of an overload protection device for a compressor motor according to an embodiment of the present invention.
8 is a view showing a coupling structure of a base member, a terminal member, and a resistance heating member of the overload protection device for a compressor motor according to an embodiment of the present invention.
9 is a view showing a cross-sectional structure of an overload protection device for a compressor motor according to an embodiment of the present invention.
10 and 11 are views illustrating coupling between a cover member and a base member of an overload protection device for a compressor motor according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment according to the present invention will be described. This example is not intended to be limiting.

1 is a view showing an external structure of an overload protection device 1 for a compressor motor according to an embodiment of the present invention. 2 is a view showing the coupling structure of the overload protection device 1 of the compressor motor according to an embodiment of the present invention.

The overload protection device 1 of the compressor motor according to an embodiment of the present invention includes a base member 100 made of an insulating material; a cover member 200 made of a conductive material and coupled to an upper portion of the base member 100; a terminal member 300 made of a conductive material, at least a portion of which is disposed in the base member 100 and spaced apart from the cover member 200; a resistance heating member 400 made of a conductive material, disposed in the base member 100 and having an electrical resistance; and a variable lead member 500 disposed between the terminal member 300 and the cover member 200 to open and close an electrical connection between the cover member 200 and the terminal member 300 .

In addition, the overload protection device 1 of the compressor motor according to the embodiment of the present invention includes input/output terminals A and B.

Hereinafter, each member will be described in detail.

<Base member 100>

3 is a view showing the structure of the base member 100 of the overload protection device 1 of the compressor motor according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of the base member 100 .

The base member 100 is made of an insulating material.

The base member 100 may be manufactured by insert molding. The base member 100 may be formed of a predetermined mold made of a material such as plastic having excellent insulation and thermal insulation as a whole. In addition, since the base member 100 may be manufactured by an insert molding method, the first terminal segment 310 and the second terminal segment 320 of the terminal member 300 to be described later are put into and fixed to a predetermined mold. After making the mold, it can be manufactured by injecting the mold material into the mold. Accordingly, the base member 100 and the terminal member 300 may have an integrated configuration. As the manufacturing is performed by such an insert molding method, the base member 100 and the terminal member 300 are integrally configured to simplify the assembly process and prevent shaking between parts, and the cover member 200 and the terminal member to be described later. Insulation between 300 can be made reliably.

The base member 100 has a lower mounting space 130 in which a terminal member 300 to be described later is mounted. The lower mounting space 130 includes a first mounting space 132 and a second mounting space 134 , as will be described later.

The base member 100 includes a base body 110 and a fastening body 120 .

A first mounting space 132 open upward is formed in the base body 110 . The first mounting space 132 has a predetermined depth and volume. Accordingly, the base body 110 has a structure similar to that of a bowl as a whole.

The fastening body 120 is provided on the base body 110 . The fastening body 120 may protrude further in the front-rear direction and the left-right direction than the base body 110 .

As the fastening body 120 protrudes further in the front and rear direction compared to the base body 110 , a mounting surface 122 on which a terminal member 300 to be described later can be placed and supported on the lower surface of the fastening body 120 is provided. can be formed.

A second mounting space 134 opened upward is formed in the fastening body 120 . The second mounting space 134 has a predetermined depth and volume. When viewed from the top, the second mounting space 134 has a larger area than the first mounting space 132 . A bottom surface of the second mounting space 134 constitutes the mounting surface 122 . The first mounting space 132 and the second mounting space 134 communicate in the vertical direction.

A front open part 140 open in the front-rear direction may be formed in front of the fastening body 120 . At least a portion of the first mounting space 132 may be opened forward through the front opening part 140 .

According to the embodiment, a rear open part 150 opened in the front-rear direction may be formed at the rear of the fastening body 120 . At least a portion of the first mounting space 132 may be opened rearwardly through the rear opening part 150 . On the other hand, the rear open part 150 is not necessarily penetrated in the front-rear direction, but may be a closed, recessed groove-shaped part to the rear.

In addition, the upper part of the front open part 140 and the upper part of the rear open part 150 have a terminal member 300 and a cover member 200 to be described later when the cover member 200 to be described later is coupled, respectively. A front insulating portion 142 and a rear insulating portion 152 are formed to insulate therebetween. The front insulating part 142 and the rear insulating part 152 can be effectively formed by the insert molding method described above. That is, after fixing the terminal member to be described later at a predetermined position in the mold, the mold material is injected into the mold, and at this time, the mold material surrounds at least a portion of the terminal member to be described later, so that the front insulating part 142, and a rear insulating part 152 may be formed.

<Cover member 200>

5 is a view showing the structure of the cover member 200 of the overload protection device 1 of the compressor motor according to an embodiment of the present invention.

The cover member 200 is made of a conductive material. The cover member 200 is coupled to the upper portion of the base member 100 . The cover member 200 covers the second mounting space 134 and the first mounting space 132 of the base member 100 .

The cover member 200 may include a cover body 210 and a cover hook 220 disposed under the cover body 210 .

An upper mounting space 240 having an open lower portion is formed in the cover body 210 . The upper mounting space 240 has a predetermined depth upward and has a predetermined volume. A variable lead member 500 to be described later may be positioned in the upper mounting space 240 .

A fixing protrusion 252 to which one end of the variable lead member 500 to be described later may be fixed may be provided on the lower surface of the cover body 210 . In addition, a contact protrusion 254 to which the other end of the variable lead member 500 may contact may be provided on the lower surface of the cover body 210 .

The cover hook 220 may be a part in the form of a predetermined hook in which the lower end is curved inwardly left and right after protruding downward of the cover body 210 .

Accordingly, when the base member 100 and the cover member 200 are coupled, the fastening body 120 may be coupled within the cover hook 220 .

The coupling between the base member 100 and the cover member 200 may be made, for example, by a Caulking process. For example, as shown in FIG. 10 , after inserting the fastening body 120 of the base member 100 into the cover hook 220 in a state in which the cover hook 220 of the cover member 200 is unfolded, FIG. 11 . As shown, by pressing the cover hook 220 from both sides as indicated by an arrow P using a predetermined Caulking jig (not shown), it is possible to couple between the base member 100 and the cover member 200 . At this time, it is also possible to press the cover hook 220 from the bottom to the top according to the shape and process of the Caulking jig (not shown), so that the fastening body 120 is strongly pressed from the bottom to be fixed in a gripping form. Accordingly, the cover member 200 may have a Caulking coupling structure.

By using such a caulking process, the bonding is made, so that the base member 100 and the cover member 200 are in close contact with each other, and the coupling between the base member 100 and the cover member 200 is made firmly, Penetration of foreign substances can be prevented.

In addition, since the base member 100 and the cover member 200 are in close contact with each other, a separate member such as a gasket may not be required.

However, the coupling between the base member 100 and the cover member 200 is not necessarily limited thereto.

According to an embodiment, the cover member 200 may include a cover terminal 230 protruding to one side. For example, the cover terminal 230 may protrude forward of the cover member 200 .

<Terminal member 300 and resistance heating member 400>

6 is a view showing the terminal member 300 and the resistance heating member 400 of the overload protection device 1 of the compressor motor according to an embodiment of the present invention.

The terminal member 300 may include a first terminal segment 310 , a second terminal segment 320 , and a resistance heating member 400 .

The terminal member 300 is mounted in the lower mounting space 130 of the base member 100 .

The first terminal segment 310 is located in front of the second mounting space 134 . A first terminal segment 310 rests on a mounting surface 122 .

The first terminal segment 310 includes a terminal body 312 and a protruding terminal 314 . The terminal body 312 may be fitted and fixed in the second mounting space 134 . The protruding terminal 314 may protrude forward through the front opening 140 formed in the front of the second mounting space 134 . Accordingly, the first terminal segment 310 may be fitted and fixed to the front side of the second mounting space 134 .

The second terminal segment 320 is located at the rear of the second mounting space 134 . The second terminal segment 320 rests on the mounting surface 122 .

At least a portion of the second terminal segment 320 may be inserted into the rear opening 150 formed in the rear of the second mounting space 134 . Accordingly, the second terminal segment 320 may be fitted and fixed to the rear side of the second mounting space 134 .

A contact block 330 may be provided on the second terminal segment 320 . The contact block 330 may be configured as a predetermined energizing block fixed on the second terminal segment 320 .

Although not shown in the drawings, a contact emboss that has a three-dimensional shape and protrudes upward may be provided on the contact block 330 .

As described above, at least a portion of the first terminal segment 310 may be fixed by being inserted into the front opening 140 . In addition, the rear of the second terminal segment 320 may be fixed by being fitted into the rear opening 150 .

When the base member 100 and the cover member 200 are coupled, between the first terminal segment 310 and the cover member 200, and between the second terminal segment 320 and the cover member 200, the base member ( 100) is located.

Accordingly, the first terminal segment 310 and the second terminal segment 320 are spaced apart without contacting the cover member 200 . That is, if there is no separate electrical connection means (a variable lead member 500 to be described later), the terminal member 300 and the cover member 200 are electrically disconnected.

The resistance heating member 400 is a member having electrical resistance and dissipating heat when electricity is applied thereto. The resistance heating member 400 may have, for example, a wound coil structure as shown in the drawings. Alternatively, the resistance heating member 400 may have a plate shape having resistance. That is, the resistance heating member 400 may have an integral shape capable of generating heat.

The resistance heating member 400 connects between the first terminal segment 310 and the second terminal segment 320 . One end of the resistance heating member 400 may be positioned on the first terminal segment 310 and electrically connected thereto. In addition, the other end of the resistance heating member 400 is positioned on the second terminal segment 320 and may be electrically connected.

The resistance heating member 400 may be located in the first mounting space 132 .

According to the embodiment, the resistive heating member 400 may have an appropriate winding structure, length, shape, etc. so that heat of a predetermined temperature is generated according to the application of a predetermined electric power. The electrical resistance, heat amount, size, etc. of the resistance heating member 400 may be appropriately selected. Accordingly, the resistance heating member 400 according to desired specifications may be applied.

8 is a view showing the coupling structure of the base member 100, the terminal member 300, and the resistance heating member 400 of the overload protection device 1 of the compressor motor according to an embodiment of the present invention.

As shown in FIG. 8 , the terminal member 300 and the resistance heating member 400 may be mounted and coupled within the base member 100 .

<Variable lead member 500>

7 is a view showing the variable lead member 500 of the overload protection device 1 of the compressor motor according to an embodiment of the present invention.

The variable lead member 500 is disposed between the terminal member 300 and the cover member 200 .

The variable lead member 500 opens and closes an electrical connection between the cover member 200 and the terminal member 300 .

The variable lead member 500 has conductivity and is made of a bimetal material whose shape varies according to temperature. In this case, the variable lead member 500 may be made of a material having an elastic restoring force in addition to electrical conductivity so that the shape can be changed and restored. For example, the variable lead member 500 may include a material such as copper. In addition, it may be composed of a plate-shaped member having a predetermined length and area so as to easily change and restore the shape.

The variable lead member 500 may connect between the second terminal segment 320 and the cover member 200 . Accordingly, the variable lead member 500 may be electrically connected between the second terminal segment 320 and the cover member 200 .

The variable lead member 500 includes a variable lead body 510 in the form of a plate that is deformable according to temperature, a fixed end block 520 disposed on a front portion and a rear portion of the variable lead body 510, respectively, and a movable contact point. However, it may include a block 530 .

The front portion of the variable lead body 510 is configured as a fixed contact fixedly connected to the cover member 200 . In addition, the rear portion of the variable lead body 510 is configured as a movable contact variably connected to the second terminal segment 320 . According to the embodiment, the fixed contact is a part connected to the cover member 200 , and the movable contact is a part connected to the second terminal segment 320 .

The variable lead body 510 is disposed on the resistance heating member 400 to extend a predetermined length in the longitudinal direction.

A fixed end block 520 is provided at the fixed contact point to connect the variable lead body 510 and the cover member 200 . For example, the fixed end block 520 and the front portion of the variable lead body 510 may be fixedly connected to the fixing protrusion 252 of the cover member 200 .

A movable contact end block 530 may be provided at the variable contact point. The movable contact end block 530 may protrude downward and may come into contact with the second terminal segment 320 of the terminal member 300 or the contact block 330 .

The variable lead member 500 is electrically connected to the terminal member 300 by contacting the movable contact with the terminal member 300 when the temperature is lower than a predetermined critical temperature. However, when the temperature exceeds a predetermined critical temperature, the variable lead member 500 is deformed. When the shape of the variable lead member 500 is deformed, the position of the movable contact may be lifted upward. Accordingly, the electrical connection between the movable contact and the second terminal segment 320 can be opened and closed.

Specifically, when the movable contact of the variable lead member 500 and the second terminal segment 320 (or the contact block 330) are in electrical contact, the variable lead member 500 and the second terminal segment ( 320) is achieved.

For example, FIG. 9 is a cross-sectional view illustrating a case where the movable contact and the second terminal segment 320 are in contact.

For example, when the first terminal segment 310 is an input terminal, the current applied through the first terminal segment 310 may include the resistance heating member 400 , the second terminal segment 320 , and the variable lead member 500 . , flows along the cover member 200 . At this time, the cover member 200 (more precisely, the cover terminal 230 provided in the cover member 200) becomes an output terminal.

Meanwhile, when the variable lead member 500 is deformed and the movable contact is spaced apart from the second terminal segment 320 , an electrical connection between the second terminal segment 320 and the variable lead member 500 is performed. This can be turned off. In this case, the movable contact end block 530 composed of the movable contact may be raised to be spaced apart from the second terminal segment 320 .

On the other hand, the opposite is also possible. For example, the movable contact end block 530 is fixed to the second terminal segment 320 to become a fixed contact, and it is also possible that a place where the fixed contact end block 520 is located functions as a movable contact.

That is, when a predetermined critical temperature is reached by the heat generated by the resistance heating member 400 , the variable lead member 500 is deformed to cut off the electrical connection between the movable contact and the terminal member 300 . Accordingly, the electrical connection between the first terminal segment 310 and the cover member 200 (cover terminal 230 ) may be blocked.

As described above, the shape change of the variable lead member 500 is achieved by application of a predetermined electric power and generation of a predetermined operating temperature. As a result, when a predetermined electric power is applied, the variable lead member 500 and the terminal It may be described that the electrical connection between the members 300 is released.

It can be understood that, when power exceeding a predetermined limit is applied, the electrical connection of the compressor motor overload protection device according to the present invention is released, thereby having an effect of protecting the overload.

In addition, when the heat generation of the resistance heating member 400 is stopped and the temperature is cooled to reach a predetermined return temperature, the shape of the variable lead member 500 is restored, and the movable contact may contact the terminal member 300 again.

Accordingly, the resistance heating member 400 and the variable lead member 500 constitute an overload protection module.

<Effect of the present invention>

According to an embodiment of the present invention, at least a portion of the terminal member 300 may be embedded and fixed in a mold material constituting the base member 100 . In addition, the front end of the variable lead member 500 is configured as a fixed contact and is fixed to the cover. Accordingly, unnecessary contact and electric leakage between various conductive members (such as the terminal member 300 , the resistance heating member 400 , and the variable lead member 500 ) disposed in the upper mounting space 240 and the lower mounting space 130 . This can be prevented. In addition, occurrence of defects due to processing tolerances and the like can be effectively prevented.

According to the embodiment of the present invention, all parts (terminal member 300, resistance heating member 400) except for the cover member 200 and the variable lead member 500 are assembled in one base member 100, By coupling the cover member 200 to the base member 100, it is possible to determine the quality/failure of the product before manufacturing the finished product. Therefore, when a defect occurs, rework can be easily performed.

In addition, the cover member 200 includes a cover hook 220 , and the terminal member 300 , the resistance heating member 400 , and the variable lead member 500 are coupled to the base member 100 . Since is simply inserted into the cover hook 220 of the cover member 200 and assembled, process efficiency can be improved.

In addition, a front open part 140 and a rear open part 150 are provided on the front and rear sides of the base member 100, respectively, and the front open part 140 and the rear open part 150 have terminal members ( By fitting 300 , insulation between the terminal member 300 and the cover member 200 is achieved. Accordingly, the number of parts required for manufacturing the product can be reduced. For example, in accordance with embodiments of the present invention, no parts such as gaskets are required. In addition, since the assembly process is simplified, the process may be simplified and the occurrence of defective products may be reduced. In addition, there is no short circuit even when the resistance heating member 400 touches the inner surface of the base member 100 , and durability against product heat generation is high.

Further, according to the embodiment, the contact block 330 and the contact embossing are provided, and the movable contact of the variable lead member 500 has a configuration that can contact the contact embossing, so that the variable lead member 500 and the first contact embossing are provided. The effect of electrical contact between the two terminal segments 320 can be improved.

In addition, according to the embodiment, at least a portion of the first and second terminal segments 320 constituting the terminal member 300 may be embedded in the base member 100 . In addition, at least one portion of the first and second terminal segments 320 may be embedded and sealed by being surrounded by an insulating material constituting the base member 100 .

Accordingly, an area in which the terminal member 300 is unnecessarily exposed inside the base member 100 may be reduced. If the terminal member 300 is excessively exposed in the base member 100 , heat generated from the exposed portion may unintentionally thermally deform the variable lead member 500 . This may prevent variations in the intended precise power and operating temperature. However, according to the present invention, as the terminal member 300 is buried and sealed in the base member 100, unnecessary heat exposure as described above is prevented, and overload protection at accurate power and operating temperature can be achieved.

In addition, according to the embodiment, the terminal member 300 made of a conductor for electrical flow is embedded in the base member 100 made of an insulating material, sealed and isolated. Accordingly, a phenomenon in which the arc generated when the fixed contact and the movable contact are switched is reflected by the conductor to generate radiant heat can be eliminated. In the conventional case, a predetermined arc may be generated and reflected when the fixed contact and the movable contact of the variable lead member 500 are switched during the operation process. However, in the present invention, the terminal member 300 is embedded in the base member 100 as described above, so that the arc generation and reflection can be prevented.

In addition, in the present invention, the terminal member 300 can be completely fixed to the terminal member 300 which is an insulator. Therefore, despite the deformation of the base member 100 generated by electrical, physical, and thermal shock of the device, the terminal member 300 is stably fixed, and there is an effect of reducing the failure rate of the overall device.

In addition, according to an embodiment, the base member 100 may be manufactured by an insert molding method. That is, the base member 100 may be configured by positioning the members in a predetermined mold and injecting a plastic casting into the mold so that the terminal member 300 is embedded in the base member 100 as described above. Therefore, as in the embodiment, the terminal member 300 may have a configuration in which the base member 100 is embedded. Accordingly, the terminal member 300 may be stably fixed to the base member 100 . Accordingly, it is possible to prevent deformation of the product due to the heat generated by the resistance heating member 400 .

According to an embodiment, when the terminal member 300 and the base member 100 are coupled by insert molding, the process of assembling the terminal members 300 for electrical flow into the base member 100 may be omitted. . Thus, production automation is possible. Accordingly, there is an effect of reducing the deviation between devices and producing products with uniform characteristics. In addition, the present invention does not have a structure in which the terminal member 300 is inserted into the base member 100 , but has a structure in which the base member 100 and the terminal member 300 are integrated. Accordingly, the residue of the base member 100 generated when the terminal member 300 is inserted may have an effect of reducing a failure that is located between the fixed contact and the movable contact and prevents the electrical connection.

In addition, the present invention reduces the thermal deformation of the device by minimizing the radiative conduction of heat generated from the terminal member 300 acting as a heating element by configuring the terminal member 300 to be embedded in the base member 100 as described above. It has the effect of ensuring accurate operation. That is, the terminal member 300 may be embedded in the base member 100 and unnecessary heat transfer may be blocked. Accordingly, unintended and unnecessary heat radiation to the variable lead member 500 may be prevented as described above. Accordingly, the overload protection device 1 of the compressor motor according to the embodiment of the present invention can be ensured to operate at an accurate operating temperature.

In addition, in the present invention, the inside of the base member 100 as a whole is sealed with an insulator, and the connection portion between the terminal members 300 can be sealed and isolated. Accordingly, there is an effect of securing safety by preventing an explosion inside the device from causing an external explosion and preventing an external combustible gas from entering the inside.

In addition, in the present invention, the base member 100 is coupled to the cover member 200 , and the cover member 200 covers the base member 100 as a whole and is coupled thereto. Therefore, the base member 100 and the cover member 200 are firmly coupled to the inside of the base member 100 can be reliably sealed. Therefore, external inflow of water, gas, dust, etc. is prevented, thereby reducing the occurrence rate of product failure.

In the above, preferred embodiments have been illustrated and described, but 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 invention as claimed in the claims is not limited thereto. Various modifications are possible by those having, of course, these modifications should not be individually understood from the technical spirit or perspective of the present invention.

1: Overload protection of compressor motor
100: base member
110: base body
120: fastening body
122: mounting surface
130: lower mounting space
132: first mounting space
134: second mounting space
140: front open part
142: front insulation
150: rear open part
152: rear insulation
200: cover member
210: cover body
220: cover hook
230: cover terminal
240: top mount space
252: fixed stone
254: contact protrusion
300: no terminal
310: first terminal segment
312: terminal body
314: protruding terminal
320: second terminal segment
330: contact block
400: resistance heating member
500: variable lead member
510: variable lead body
520: fixed end block
530: movable contact end block

Claims (11)

In the overload protection device of a compressor motor,
a base member made of an insulating material;
a cover member made of a conductive material and coupled to an upper portion of the base member;
a terminal member made of a conductive material, at least a portion of which is disposed in the base member and spaced apart from the cover member;
a resistance heating member made of a conductive material and disposed within the base member and having an electrical resistance;
a variable lead member disposed between the terminal member and the cover member and configured to open and close an electrical connection between the cover member and the terminal member;
The base member includes a lower mounting space with an open upper portion,
The cover member includes an upper mounting space with an open lower portion,
the terminal member comprises a first terminal segment and a second terminal segment;
The resistance heating member connects between the first terminal segment and the second terminal segment,
at least a portion of the first terminal segment protrudes outside of the base member;
The variable lead member is located in the upper mounting space, connects between the second terminal segment and the cover member, has one end of a fixed contact and the other end of a movable contact, and is made of a material having conductivity and elastic restoring force. It is composed of bimetal whose shape varies according to temperature,
When the shape of the variable lead member is deformed, the electrical connection of the movable contact is opened and closed according to the change of the position of the movable contact. The method according to claim 1,
The base member is
a base body constituting the lower part; and
Comprising a fastening body constituting the upper part and extending laterally than the base body,
An overload protection device for a compressor motor having a cover hook to which the fastening body is coupled to a lower portion of the cover member. 3. The method according to claim 2,
The lower mounting space is
a first mounting space formed in the base body and in which the resistance heating member is located; and
and a second mounting space formed in the fastening body and in which the first terminal segment and the second terminal segment are located. 4. The method according to claim 3,
In front of the fastening body,
A front open part opened in the front-rear direction is formed,
At least a portion of the first terminal segment is embedded in the front opening and protrudes forward of the base member through the front opening. 5. The method of claim 4,
A front insulating part is formed on the upper part of the front opening part,
The front insulation
An overload protection device for a compressor motor positioned between the cover member and the first terminal segment embedded in the front opening. 4. The method according to claim 3,
At the rear of the fastening body,
A rear open part opened in the front and rear direction is formed,
and at least a portion of the second terminal segment is embedded in the rear opening. 7. The method of claim 6,
A rear insulating part is formed on the upper part of the rear opening part,
the rear insulation
An overload protection device for a compressor motor positioned between the cover member and the second terminal segment embedded in the rear opening. The method according to claim 1,
The resistance heating member,
Consists of a heating coil wound with a predetermined length,
The variable lead member,
An overload protection device for a compressor motor located above the heating coil. The method according to claim 1,
The fixed contact is a part connected to the cover,
and the movable contact is a portion connected to the second terminal segment. 10. The method of claim 9,
On the second terminal segment,
A contact block is provided,
The movable contact is an overload protection device of the compressor motor in contact with the contact block. The method according to claim 1,
The base member and the terminal member,
Overload protection device for compressor motor manufactured integrally by insert molding.

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