Magnetic starting device for explosion-proof motor

Abstract

The utility model relates to the technical field of explosion -proof motor, and disclose a kind of magnetic starting device of explosion -proof motor, including first explosion -proof box subassembly;Second explosion -proof box subassembly is installed in the side portion of first explosion -proof box subassembly;And the connecting bracket for connecting first explosion -proof box subassembly and second explosion -proof box subassembly;The first explosion -proof box subassembly includes: first explosion -proof box body;Main contactor is arranged between the heat conduction plate, the U type heat pipe is penetrated in the inside of one of heat conduction plate, the side portion of main contactor is provided with bypass contactor.The utility model is directly started by increasing bypass contactor to realize the direct starting of high -efficient motor under the condition that explosion -proof mould size of motor magnetic force starter existing is not changed, avoid the phenomenon that motor cannot be started that protection tripping occurs due to the starting current of thermal relay is too high, starting time is too long, save the cost of reformation, reach the purpose of directly starting high -efficient motor.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof motor technology, specifically an explosion-proof motor magnetic starting device. Background Technology

[0002] The explosion-proof motor magnetic starter is an electrical control device designed specifically for flammable and explosive hazardous environments. It is mainly used to control the starting, stopping, and reversing operations of explosion-proof motors, and provides protection functions such as overload, short circuit, phase loss, and undervoltage.

[0003] In flammable and explosive environments, some motor-operated equipment requires explosion-proof magnetic starters to start, stop, and control the motors in an explosion-proof environment. For motors with an energy efficiency rating of level two or below, the starting current is generally 6-7 times the rated current. Magnetic starters for these motors typically use a direct starting method, with the main circuit as follows: Figure 4 The diagram shows the control methods for circuit breakers, contactors, and thermal relays.

[0004] With the promotion of national energy conservation policies, high-efficiency motors with Level 1 energy efficiency are gradually being put into use in factories. Level 1 energy efficiency motors have a starting current multiple of 9-10 times the rated current, and some even reach 10 times.

[0005] The conventional magnetic starter that uses circuit breakers, contactors and thermal relays cannot meet the starting requirements of Class I energy efficiency motors. When the motor starts, the thermal relay is prone to tripping due to excessive starting current and excessive starting time, and the motor cannot start. Utility Model Content

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0007] Given that the existing conventional magnetic starters cannot meet the starting requirements of Class I energy efficiency motors, the thermal relay is prone to tripping due to excessive starting current and long starting time when the motor starts, thus preventing the motor from starting.

[0008] To achieve the above objectives, this utility model provides the following technical solution: An explosion-proof motor magnetic starter includes a first explosion-proof enclosure assembly; a second explosion-proof enclosure assembly installed on the side of the first explosion-proof enclosure assembly; and a connecting bracket for connecting the first explosion-proof enclosure assembly and the second explosion-proof enclosure assembly. The first explosion-proof enclosure assembly includes: a first explosion-proof enclosure body; heat dissipation fins disposed on the left and right sides of the first explosion-proof enclosure body; a U-shaped heat pipe fixed to the top of the first explosion-proof enclosure body; and a heat-conducting plate disposed inside the first explosion-proof enclosure body; A main contactor is provided between the heat-conducting plates, and the U-shaped heat pipe passes through the interior of one of the heat-conducting plates. A bypass contactor is provided on the side of the main contactor.

[0009] As a further embodiment of this utility model: the first explosion-proof box assembly further includes: a first explosion-proof box cover bolted to the top of the first explosion-proof box; a circuit breaker installed inside the first explosion-proof box, wherein a thermal relay is provided on the side of the circuit breaker.

[0010] As a further improvement of this utility model: a thermal pad is provided at the connection between the bypass contactor and the first explosion-proof enclosure, and a thermal pad is also provided at the connection between the main contactor and the heat-conducting plate.

[0011] As a further embodiment of this utility model: the second explosion-proof box assembly includes: a second explosion-proof box body connected to the side of the first explosion-proof box body; and a second explosion-proof box cover installed on the top of the second explosion-proof box body by bolts.

[0012] As a further embodiment of this utility model, the second explosion-proof box assembly further includes: an explosion-proof indicator light disposed above the second explosion-proof box cover; a button fixed to the side of the explosion-proof indicator light; and two connection ports fixed to the side of the second explosion-proof box body away from the first explosion-proof box body.

[0013] As a further improvement of this utility model: one of the connecting wire ports is an inlet port, and the other connecting wire port is an outlet port.

[0014] As a further improvement of this utility model: a terminal bracket is installed inside the second explosion-proof enclosure by bolts, and a wiring terminal is installed on the top of the terminal bracket.

[0015] As a further improvement of this utility model, a cable connection groove is provided at the connection between the first explosion-proof enclosure and the second explosion-proof enclosure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model incorporates heat dissipation fins and a U-shaped heat pipe. The heat dissipation fins are integrated with the first explosion-proof enclosure, avoiding the formation of gaps that can accumulate dust or gas. At the same time, it ensures that the shell strength meets explosion-proof standards. The U-shaped heat pipe occupies less space and can efficiently transfer heat, achieving active heat dissipation.

[0017] 2. This utility model, by setting a bypass contactor, achieves direct starting of a high-efficiency motor without changing the existing explosion-proof mold size of the motor magnetic starter. This avoids the phenomenon of thermal relay tripping due to excessive starting current and long starting time, preventing the motor from starting. It saves modification costs and achieves the goal of directly starting a high-efficiency motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a magnetic starting device for an explosion-proof motor. Figure 2 A schematic diagram of the structure of an explosion-proof motor magnetic starting device, viewed from below. Figure 3 A schematic diagram of the internal structure of the first explosion-proof enclosure of an explosion-proof motor magnetic starter device; Figure 4 A schematic diagram of the cross-sectional structure of a U-shaped heat pipe in an explosion-proof motor magnetic starting device; Figure 5 This is a control circuit diagram for a magnetic starting device for an explosion-proof motor. Figure 6 This is the control circuit diagram for an existing explosion-proof motor magnetic starter.

[0019] In the diagram: 1. First explosion-proof enclosure assembly; 101. First explosion-proof enclosure body; 102. First explosion-proof enclosure cover; 103. Heat dissipation fins; 104. U-shaped heat pipe; 105. Heat-conducting plate; 2. Second explosion-proof enclosure assembly; 201. Second explosion-proof enclosure body; 202. Second explosion-proof enclosure cover; 203. Button; 204. Explosion-proof indicator light; 205. Connection port; 3. Connection bracket; 4. Cable connection groove; 5. Terminal block; 6. Terminal bracket; 7. Main contactor; 8. Circuit breaker; 9. Bypass contactor; 10. Thermal relay. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0023] Example 1: Please see Figures 1-4 This is the first embodiment of the present utility model. This embodiment provides an explosion-proof motor magnetic starting device, including a first explosion-proof enclosure assembly 1; a second explosion-proof enclosure assembly 2 installed on the side of the first explosion-proof enclosure assembly 1; and a connecting bracket 3 for connecting the first explosion-proof enclosure assembly 1 and the second explosion-proof enclosure assembly 2. The first explosion-proof enclosure assembly 1 includes: a first explosion-proof enclosure 101; heat dissipation fins 103 disposed on the left and right sides of the first explosion-proof enclosure 101; a U-shaped heat pipe 104 fixed to the top of the first explosion-proof enclosure 101; and a heat-conducting plate 105 disposed inside the first explosion-proof enclosure 101. A main contactor 7 is provided between the heat-conducting plates 105, and a U-shaped heat pipe 104 passes through the interior of one of the heat-conducting plates 105. A bypass contactor 9 is provided on the side of the main contactor 7.

[0024] Specifically, the first explosion-proof enclosure assembly 1 also includes: a first explosion-proof enclosure cover 102 bolted to the top of the first explosion-proof enclosure 101; a circuit breaker 8 installed inside the first explosion-proof enclosure 101, with a thermal relay 10 provided on the side of the circuit breaker 8.

[0025] Furthermore, a time relay is also installed inside the first explosion-proof enclosure 101 to control the delayed opening of the main contactor 7.

[0026] Specifically, a thermal pad is provided at the connection between the bypass contactor 9 and the first explosion-proof enclosure 101, and a thermal pad is also provided at the connection between the main contactor 7 and the heat-conducting plate 105.

[0027] Furthermore, the heat from the main contactor 7 and the bypass contactor 9 can be transferred to the heat-conducting plate 105 and the first explosion-proof enclosure 101 respectively through the heat-conducting pad. The heat dissipation fins 103 are used to dissipate heat from the first explosion-proof enclosure 101, while the heat from the heat-conducting plate 105 can be discharged outward through the U-shaped heat pipe 104, thereby achieving a good heat dissipation effect.

[0028] In use, the heat generated by the main contactor 7, bypass contactor 9, and thermal relay 10 during operation can be transferred to the heat-conducting plate 105 and the first explosion-proof enclosure 101 respectively through the thermal pad, and then transferred to the outside through the heat dissipation fins 103. The heat of the heat-conducting plate 105 can be discharged to the outside through the U-shaped heat pipe 104. The evaporation end of the U-shaped heat pipe 104 is embedded inside the heat-conducting plate 105, and the condensation end is located outside the first explosion-proof enclosure 101. The medium inside the U-shaped heat pipe 104 is heated, evaporates, and flows to the condensation end, and then re-condenses at the condensation end. In this process, rapid cooling is achieved. The heat dissipation fins 103 and the first explosion-proof enclosure 101 are integrated into the design to avoid the formation of gaps that can accumulate dust or gas, while ensuring that the shell strength meets the explosion-proof standard. The U-shaped heat pipe 104 occupies a small space and can achieve efficient heat transfer, realizing active heat dissipation.

[0029] In summary, by setting up heat dissipation fins 103 and U-shaped heat pipes 104, the heat dissipation fins 103 are integrated with the first explosion-proof enclosure 101, avoiding the formation of gaps that can accumulate dust or gas, while ensuring that the shell strength meets explosion-proof standards. The U-shaped heat pipes 104 occupy less space and can efficiently transfer heat, achieving active heat dissipation.

[0030] Example 2: Please see Figures 3-6 This is the second embodiment of the present utility model.

[0031] Specifically, the second explosion-proof enclosure assembly 2 includes: a second explosion-proof enclosure 201 connected to the side of the first explosion-proof enclosure 101; and a second explosion-proof enclosure cover 202 bolted to the top of the second explosion-proof enclosure 201.

[0032] Furthermore, the second explosion-proof cover 202 is used to connect the second explosion-proof enclosure 201.

[0033] Specifically, the second explosion-proof box assembly 2 also includes: an explosion-proof indicator light 204 disposed above the second explosion-proof box cover 202; a button 203 fixed to the side of the explosion-proof indicator light 204; and two connection ports 205 fixed to the side of the second explosion-proof box 201 away from the first explosion-proof box 101.

[0034] Furthermore, the explosion-proof indicator light 204 and the button 203 are connected to the terminal block 5 via cables.

[0035] Specifically, one of the connection ports 205 is the inlet port, and the other connection port 205 is the outlet port.

[0036] Furthermore, the two sets of connection ports 205 are used to connect the motor.

[0037] Specifically, a terminal bracket 6 is bolted to the inside of the second explosion-proof enclosure 201, and a wiring terminal 5 is installed on the top of the terminal bracket 6.

[0038] Furthermore, terminal 5 is used for cable routing connections.

[0039] Specifically, a cable connection groove 4 is provided at the connection between the first explosion-proof enclosure 101 and the second explosion-proof enclosure 201.

[0040] Furthermore, the cable can connect the electrical components between the first explosion-proof enclosure 101 and the second explosion-proof enclosure 201 via the cable connecting groove 4.

[0041] In operation, circuit breaker 8 is QF, main contactor 7 is KM, thermal relay 10 is FR, and bypass contactor 9 is KM1. When the high-efficiency motor starts, bypass contactor 9KM1 is closed first, enabling the high-efficiency motor to start normally. After bypass contactor 9KM1 closes, it drives a time relay. The time relay has a certain delay; the set time must be greater than the motor's starting time. That is, after the high-efficiency motor has completed starting, main contactor 7KM closes. After main contactor 7KM closes, bypass contactor 9KM1 is disconnected through the auxiliary contacts of main contactor 7KM, enabling the high-efficiency motor to start normally. The thermal relay 10 module... During operation, because the bypass contactor 9KM1 is closed and the main contactor 7KM is open, the thermal relay 10 is not activated. The starting current of the motor only flows through the bypass contactor 9KM1 and does not pass through the thermal relay 10, so it has no effect on the thermal relay 10. During the motor startup process, the thermal relay 10 will not trip due to excessive starting current, ensuring the normal startup of the high-efficiency motor. After the motor starts, the main contactor 7KM closes and the bypass contactor 9KM1 opens. The current flowing through the thermal relay 10 is the rated current of the motor, and the protection function of the thermal relay 10 is normally activated, providing thermal protection during normal motor operation and meeting the protection requirements.

[0042] In summary, by adding the bypass contactor 9, without changing the existing explosion-proof mold size of the motor magnetic starter, the direct starting of the high-efficiency motor can be achieved. This avoids the phenomenon that the thermal relay 10 trips due to excessive starting current and long starting time, preventing the motor from starting. This saves on modification costs and achieves the goal of directly starting the high-efficiency motor.

[0043] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0044] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0045] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A magnetic starting device for an explosion-proof motor, characterized in that, include: First explosion-proof box assembly (1); second explosion-proof box assembly (2) installed on the side of the first explosion-proof box assembly (1); and connecting bracket (3) for connecting the first explosion-proof box assembly (1) and the second explosion-proof box assembly (2); The first explosion-proof enclosure assembly (1) includes: a first explosion-proof enclosure (101); heat dissipation fins (103) disposed on the left and right sides of the first explosion-proof enclosure (101); a U-shaped heat pipe (104) fixed to the top of the first explosion-proof enclosure (101); and a heat-conducting plate (105) disposed inside the first explosion-proof enclosure (101). A main contactor (7) is provided between the heat-conducting plates (105), and the U-shaped heat pipe (104) passes through the interior of one of the heat-conducting plates (105). A bypass contactor (9) is provided on the side of the main contactor (7).

2. The explosion-proof motor magnetic starting device according to claim 1, characterized in that: The first explosion-proof enclosure assembly (1) further includes: a first explosion-proof enclosure cover (102) bolted to the top of the first explosion-proof enclosure (101); a circuit breaker (8) installed inside the first explosion-proof enclosure (101), wherein a thermal relay (10) is provided on the side of the circuit breaker (8).

3. The explosion-proof motor magnetic starting device according to claim 2, characterized in that: A thermal pad is provided at the connection between the bypass contactor (9) and the first explosion-proof enclosure (101), and a thermal pad is also provided at the connection between the main contactor (7) and the heat-conducting plate (105).

4. The explosion-proof motor magnetic starting device according to claim 3, characterized in that: The second explosion-proof enclosure assembly (2) includes: a second explosion-proof enclosure (201) connected to the side of the first explosion-proof enclosure (101); and a second explosion-proof enclosure cover (202) bolted to the top of the second explosion-proof enclosure (201).

5. The explosion-proof motor magnetic starting device according to claim 4, characterized in that: The second explosion-proof box assembly (2) further includes: an explosion-proof indicator light (204) disposed above the second explosion-proof box cover (202); a button (203) fixed to the side of the explosion-proof indicator light (204); and two connection ports (205) fixed to the side of the second explosion-proof box body (201) away from the first explosion-proof box body (101).

6. The explosion-proof motor magnetic starting device according to claim 5, characterized in that: One of the connection ports (205) is an inlet port, and the other connection port (205) is an outlet port.

7. The explosion-proof motor magnetic starting device according to claim 6, characterized in that: The second explosion-proof enclosure (201) has a terminal bracket (6) installed inside by bolts, and a wiring terminal (5) is installed on the top of the terminal bracket (6).

8. The explosion-proof motor magnetic starting device according to claim 7, characterized in that: A cable connection groove (4) is provided at the connection between the first explosion-proof enclosure (101) and the second explosion-proof enclosure (201).

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