CN216928403U - Contactor - Google Patents

Abstract

The utility model discloses a contactor, which comprises a coil, a static contact part and a thermal protection part, wherein the static contact part can transfer heat to the thermal protection part, the thermal protection part is connected with the coil in series, and when the temperature of the thermal protection part exceeds a preset value, the thermal protection part is deformed or fused to disconnect the series connection with the coil. After the product circuit transships in this scheme, the static contact part of contactor lasts and heaies up and give heat protection portion with heat transfer, and after heat protection portion temperature reached the default, the coil circuit of contactor can be disconnected to hot protection portion to break off contactor's major loop, avoid circuit, component, motor to damage because of overloading, and avoid the conflagration risk that wherein probably exists, the contactor of this scheme can realize overheated automatic disconnection function promptly, need not to set other electrical components and can realize overload protection.

Description

Contactor

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a contactor.

Background

After the product current is overloaded, the static contact of the contactor arranged in the product circuit can be continuously heated, the static contact can cause contact displacement, falling off, the contactor lacks a phase and burns out a motor due to continuous heating, or the contacts are adhered, so that a working circuit cannot be disconnected, and other accidents are caused.

For this reason, the product will usually cooperate with other electrical components, such as a thermal relay, to perform the overload disconnection function, but for cost reasons, many customers will not install the thermal relay at the same time, which results in the above-mentioned serious consequences after the circuit is overloaded.

SUMMERY OF THE UTILITY MODEL

The utility model provides a contactor, which comprises a coil, a static contact part and a thermal protection part, wherein the static contact part can transfer heat to the thermal protection part, the thermal protection part is connected with the coil in series, and when the temperature of the thermal protection part exceeds a preset value, the thermal protection part is deformed or fused to disconnect the series connection with the coil.

In a specific form, the contactor is further provided with an insulating heat conducting portion, and the insulating heat conducting portion is in contact with the static contact component and the thermal protection portion at the same time, and can transfer heat of the static contact component to the thermal protection portion.

In a specific form, the housing of the contactor is provided with a first mounting groove corresponding to the stationary contact part, the insulating heat conducting portion is disposed in the first mounting groove, and the thermal protection portion is partially or completely wrapped in the insulating heat conducting portion.

In a specific form, the housing includes a wall separating the stationary contact part and the insulating heat conduction part, the wall being provided with a through hole through which a portion of the insulating heat conduction part passes to contact the stationary contact part.

In a concrete form, the housing is provided with a second mounting groove for mounting the stationary contact member, the first mounting groove and the second mounting groove share the wall as a bottom wall, and the through hole is provided in the bottom wall.

In a specific form, the housing includes a wall separating the stationary contact member and the thermal protection portion, the thermal protection portion directly contacts the wall, and the wall transfers heat of the stationary contact member to the thermal protection portion.

In one embodiment, the thermal protection portion is a fuse or a thermal trip structure.

In a specific mode, the contactor includes a plurality of the static contact parts, a plurality of the thermal protection parts are correspondingly arranged, and all the thermal protection parts are connected with the coil in series through a temperature control circuit.

In a specific mode, the contactor is provided with a first connecting terminal and a second connecting terminal for external connection, the first connecting terminal is connected to one end of the coil, the second connecting terminal is connected to one end of the temperature control circuit, and the other end of the temperature control circuit is connected to the other end of the coil.

In a specific form, the contactor is further provided with a series connection terminal to which both the other end of the temperature control line and the other end of the coil are connected.

After the product circuit transships in this scheme, the static contact part of contactor lasts and heaies up and give heat protection portion with heat transfer, and after heat protection portion temperature reached the default, the coil circuit of contactor can be disconnected to hot protection portion to break off contactor's major loop, avoid circuit, component, motor to damage because of overloading, and avoid the conflagration risk that wherein probably exists, the contactor of this scheme can realize overheated automatic disconnection function promptly, need not to set other electrical components and can realize overload protection.

Drawings

FIG. 1 is a schematic view of a contactor according to example 1 of the present invention, in which a heat protection portion and an insulating heat conduction portion are provided;

FIG. 2 is a schematic view of the coil connection of the contactor of FIG. 1 from a top view;

fig. 3 is a schematic view of a contactor provided with a thermal protection portion according to embodiment 2 of the present invention.

The reference numerals in fig. 1-3 are illustrated as follows:

1-a shell; 1 a-a via; 1 b-a first mounting groove; 1 c-a second mounting groove; 1 d-bottom wall;

2-a stationary contact part;

3-an insulating heat conducting part; 31-a protruding section;

4-a thermal protection section;

5-temperature control circuit;

61-first connection terminal; 62-second connection terminal; 63-series connection terminals;

7-a coil;

8-moving contact part.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

The contactor in the scheme comprises a coil 7 and a static contact part 2, wherein after the coil 7 is electrified, a magnetic field is generated, a moving contact part 8 and the static contact part 2 are close to each other to be switched on, and after the coil 7 is powered off, the moving contact part 8 and the static contact part 2 are far away from each other to be switched off. The contactor in the scheme further comprises a thermal protection portion 4, the static contact portion 2 generates heat in the working process, the static contact portion 2 can transfer the heat to the thermal protection portion 4, the thermal protection portion 4 is connected with the coil 7 in series, when the temperature of the thermal protection portion 4 exceeds a preset value, the thermal protection portion is disconnected, a loop of the coil 7 is disconnected, a magnetic field cannot be generated, the static contact portion 2 and the moving contact portion 8 cannot approach each other, and the contactor is correspondingly disconnected.

Example 1

Referring to fig. 1 and 2, fig. 1 is a schematic view of a contactor according to embodiment 1 of the present invention, wherein a thermal protection portion 4 and an insulating heat conduction portion 3 are disposed in the contactor; fig. 2 is a schematic view of fig. 1 from above in connection with the coil 7 of the contactor.

The thermal protection portion 4 is connected in series with the coil 7, and is a conductive structure, and may be specifically a fuse, and when the temperature of the fuse exceeds a preset value due to heat transfer of the static contact component 2, the fuse is fused, so that a loop of the coil 7 is automatically disconnected. Of course, the thermal protection portion 4 may also be other structures that can fuse through the temperature rise, for example, the thermal protection portion 4 is not limited to the whole conductive structure, and it can include wire line and the fusing portion that can fuse along with the temperature rise, and under the support of fusing portion, the wire line switches on, and after fusing portion melts at the temperature rise to the preset value, because lack the support of fusing portion, the wire line breaks. The thermal protector 4 may also be deformed to disconnect the series connection with the coil 7, for example, the thermal protector 4 may be a thermal trip structure that is deformed to disconnect the series connection with the coil 2 when the temperature exceeds a preset value, thereby disconnecting the series connection with the coil 2.

In this embodiment, the contactor further includes an insulating heat conducting portion 3, the insulating heat conducting portion 3 contacts the static contact component 2 and the thermal protection portion 4 at the same time to transfer heat of the static contact component 2 to the thermal protection portion 4, the insulating heat conducting portion 3 is a component made of a heat conducting material, and the heat conducting material should have a high heat conductivity coefficient, for example, a ceramic heat conducting material, and more specifically, a 99 alumina ceramic material may be used. The heat conduction efficiency can be adjusted by adjusting parameters such as the material and the thickness of the insulating heat conduction part 3.

In fig. 1, a housing 1 of the contactor is provided with a first mounting groove 1b corresponding to the position of the stationary contact part 2, each stationary contact part 2 can be provided with one first mounting groove 1b, at this time, the insulating heat-conducting portion 3 can be arranged in the first mounting groove 1b, and the thermal protection portion 4 is partially or completely wrapped in the insulating heat-conducting portion 3. With the arrangement, on one hand, the first mounting groove 1b provides mounting space for the thermal protection part 4 and the insulating heat conduction part 3, and the stability of the structure is ensured; in addition, the insulating heat conducting part 3 wraps the thermal protection part 4, so that more heat of the static contact component 2 can be better transmitted to the thermal protection part 4, the temperature rise condition of the static contact component 2 can be accurately reflected, and the thermal protection part 4 can timely play a role in safety protection according to temperature change. Of course, one or more thermal protection portions 4 and one or more insulating heat conduction portions 3 may also be disposed in one first mounting groove 1b, and the manner of disposing the first mounting grooves 1b in fig. 1 makes assembly more convenient, and is also beneficial to performing targeted temperature feedback on each static contact component 2.

In fig. 1, a housing 1 of the contactor includes a wall contacting a stationary contact member 2, the wall is provided with a through hole 1a, a portion of an insulating heat-conducting portion 3 passes through the through hole 1a to contact the stationary contact member 2, and the insulating heat-conducting portion 3 is disposed to directly contact the stationary contact member 2, so as to better transfer heat, and in particular, in fig. 1, a protruding section 31 is formed at one end of the insulating heat-conducting portion 3 to be inserted into the through hole 1 a. The housing 1 of the contactor may be provided with a second mounting groove 1c for placing the fixed contact member 2 and the movable contact member 8, the second mounting groove 1c has a notch and a bottom wall 1d opposite to the notch, the wall may be the bottom wall 1d of the second mounting groove 1c, the bottom wall 1d is also the bottom wall of the first mounting groove 1b, and the first mounting groove 1b and the second mounting groove 1c share one bottom wall, that is, the first mounting groove 1b and the second mounting groove 1c are distributed along the same length direction, so that the installation of the thermal protection portion 4 is facilitated while the through hole 1a is opened and the contact is realized through the insulating heat conduction portion 3 and the fixed contact member 2. In fig. 1, the bottom wall 1d is in contact with an end of the static contact component 2, where the bottom wall 1d may be a wall supporting the static contact component 2, and actually may be used according to the reverse view of fig. 1, then the bottom wall 1d supports the static contact component 2.

The wall on which the through hole 1a is formed may be a wall that contacts the static contact component 2, and certainly, the wall is not limited to the wall that contacts the static contact component 2 and is formed with the through hole 1a, as long as the insulating heat conducting portion 3 can directly contact the static contact component 2 after penetrating through the through hole 1a, and an appropriate wall of the housing 1 may be selected to form the through hole 1a according to whether the through hole 1a, the heat concentration position of the static contact component 2, the convenience in providing the insulating heat conducting portion 3 and the heat protecting portion 4, and other factors are easy to form. In fig. 1, a through hole 1a is easily formed in a bottom wall 1d of the second mounting groove 1c, and a first mounting groove 1b for mounting the insulating and heat-conducting portion 3 and the heat protecting portion 4 may be formed on the opposite side of the second mounting groove 1 c.

Referring to fig. 2 again, the left portion of fig. 2 is the top view of fig. 1, and the contactor in this embodiment is specifically provided with six static contact components 2, it can be seen that the number of the static contact components 2 is not limited, and is determined according to the type structure of the contactor. At this time, all the thermal protection parts 4 corresponding to the static contact members 2 are connected in series to one temperature control line 5, and then the temperature control line 5 and the coil 7 are connected in series, so that the thermal protection parts 4 and the coil 7 can be connected in series.

In fig. 2, the contactor is provided with a first connection terminal 61 and a second connection terminal 62 for external connection, one end of the coil 7 is connected to the first connection terminal 61, and the contactor is further provided with a series connection terminal 63, three of which are shown in fig. 2. The second connection terminal 62 is connected to one end of the temperature control line 5, the series connection terminal 63 is connected to the other end of the temperature control line 5 and one end of the coil 7, and the first connection terminal 61 is connected to the other end of the coil 7.

At this time, as can be seen from fig. 2, the second connection terminal 62, the plurality of thermal protectors 4, the series connection terminal 63, the coil 7, and the first connection terminal 61 are connected in series in this order to form a series circuit. That is, in the present embodiment, a series connection terminal 63 is specially provided on the contactor, and compared with a scheme in which two ends of the coil 7 are respectively connected to two connection terminals in the prior art, in the present embodiment, only one end of the coil 7 is connected to the second connection terminal 62, and the other end of the coil 7 and one end of the temperature control line 5 are simultaneously connected to the series connection terminal 63, so as to realize series connection of the temperature control line 5 and the coil 7, and simply realize series connection of the thermal protection portion 4 to the line of the coil 7, so as to realize on-off control of the line of the coil 7.

Of course, the serial implementation of the thermal protection unit 4 and the coil 7 is not limited to this, and for example, two serial connection terminals 63 communicating with each other may be provided in addition to the first connection terminal 61 and the second connection terminal 62, and one end of the coil 7 and one end of the temperature control line 5 may be connected to different serial connection terminals 63, respectively. For another example, the coil 7 itself may be sequentially connected to each thermal protection unit 4, and of course, the mode of setting the series connection terminal 63 and the temperature control circuit 5 to realize the thermal protection units 4 and the coil 7 is easier to realize, and the coil 7 does not need to be changed, and the temperature control circuit 5 may be arbitrarily adjusted according to the number and the position of the thermal protection units 4, so that the design is more flexible.

Example 2

Referring to fig. 3, fig. 3 is a schematic view of a thermal protection portion 4 disposed in a contactor according to embodiment 2 of the present invention.

Embodiment 2 is substantially the same in structure as embodiment 1 except that in embodiment 1, the stationary contact member 2 and the thermal protection portion 4 are indirectly contacted through the insulating heat-conducting portion 3 penetrating through the wall, whereas in embodiment 2, the stationary contact member 2 and the thermal protection portion 4 are indirectly contacted through the wall separating the two. At this time, the wall may still be the bottom wall 1d of the second installation groove 1c for installing the static contact component 2, the bottom wall 1d may be made of a material with a better heat transfer effect, or the heat transfer effect is improved by controlling the wall thickness of the bottom wall 1d, which is also a feasible scheme, and compared with embodiment 1, the structural arrangement of the scheme is simpler.

After the product circuit transships in this scheme, the static contact part 2 of contactor lasts and heaies up and gives heat protection portion 4 with heat transfer, after 4 temperature in heat protection portion reached the default, 7 circuits of coil of contactor can be disconnected to heat protection portion 4 to the major loop of disconnection contactor avoids circuit, component, motor to damage because of transshipping, and avoids the conflagration risk that wherein probably exists, the contactor of this scheme can realize overheated automatic disconnection function promptly, need not to dispose other electrical components and can realize overload protection.

The thermal protection part 4 mentioned in the above embodiments is disconnected after the temperature reaches a preset value, which can be set according to a specific product, corresponding to the temperature to which the static contact component 2 is subjected in the product.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A contactor comprises a coil (7) and a static contact part (2), and is characterized by further comprising a thermal protection part (4), wherein the static contact part (2) can transfer heat to the thermal protection part (4), the thermal protection part (4) is connected with the coil (7) in series, and when the temperature of the thermal protection part (4) exceeds a preset value, the thermal protection part (4) deforms or fuses to disconnect the series connection with the coil (7).

2. A contactor according to claim 1, characterized in that it is further provided with an insulating heat conducting portion (3), said insulating heat conducting portion (3) contacting both said static contact element (2) and said thermal protection portion (4) and being able to transfer the heat of said static contact element (2) to said thermal protection portion (4).

3. The contactor according to claim 2, characterized in that it comprises a housing (1), said housing (1) being provided with a first mounting groove (1b), said insulating heat-conducting portion (3) being provided in said first mounting groove (1b), said thermal protection portion (4) being partially or totally encased in said insulating heat-conducting portion (3).

4. A contactor according to claim 3, characterized in that said casing (1) comprises a wall separating said stationary contact member (2) and said insulating heat conducting portion (3), said wall being provided with a through hole (1a), a portion of said insulating heat conducting portion (3) passing through said through hole (1a) to contact said stationary contact member (2).

5. A contactor according to claim 4, characterized in that said housing (1) is provided with a second mounting groove (1c) for mounting said stationary contact part (2), said first mounting groove (1b) and said second mounting groove (1c) sharing said wall as a bottom wall (1d), said through hole (1a) being provided in said bottom wall (1 d).

6. Contactor according to claim 1, characterized in that it comprises a casing (1), said casing (1) comprising a wall separating said static contact piece (2) and said thermal protection portion (4), said thermal protection portion (4) being in direct contact with said wall, said wall transferring the heat of said static contact piece (2) to said thermal protection portion (4).

7. A contactor according to any of claims 1-6, characterized in that said thermal protection (4) is a fuse or a thermal trip structure.

8. Contactor according to any of claims 1-6, characterized in that it comprises a plurality of said static contact elements (2), a corresponding plurality of said thermal protectors (4), all said thermal protectors (4) being connected in series with said coil (7) by means of a temperature control circuit (5).

9. The contactor according to claim 8, wherein the contactor is provided with a first connection terminal (61) and a second connection terminal (62) for external connection, one end of the coil (7) is connected to the first connection terminal (61), one end of the temperature control line (5) is connected to the second connection terminal (62), and the other end of the temperature control line (5) is connected to the other end of the coil (7).

10. A contactor according to claim 9, characterized in that it is further provided with a series connection terminal (63), and the other end of said temperature control line (5) and the other end of said coil (7) are both connected to said series connection terminal (63).

Images