A protection mechanism for a motor circuit control branch breaker front section

Abstract

The utility model belongs to motor protection technical field especially relates to a protection mechanism of motor line control branch circuit breaker front section, including zero sequence current mutual inductor still includes: the bottom fixed mounting of zero sequence current mutual inductor has current circuit breaker, the side fixed mounting of current circuit breaker has contactor, the side fixed mounting of zero sequence current mutual inductor has thermal relay. When alternating current contactor contact of current circuit breaker is not good through zero sequence current mutual inductor cooperation, zero sequence current mutual inductor can produce greater zero sequence current, make current circuit breaker break contactor and avoid motor burnout due to lack item, can carry out current protection to motor line front section's three -phase power supply, thereby has promoted the security of motor line use, again through the thermal relay's bimetallic strip heated bending characteristic, when motor long time overload, time delay break control loop, then utilize current regulator cooperation controller, preset overload current threshold and automatic reset.

Description

Technical Field

[0001] This utility model belongs to the field of motor protection technology, and in particular relates to a protection mechanism for the front end of a motor line control branch circuit breaker. Background Technology

[0002] When electromechanical equipment is in operation, it needs to transmit power and information through lines. Electromechanical equipment is usually composed of a casing, electrical components, controller, power supply and lines. During use, the controller controls the power supply to be turned off. When the power supply is turned on, electrical energy is conducted to the electrical components through the lines to make the electrical components operate. Traditional electromechanical equipment lines are usually composed of multiple sets of power lines. During installation, the two ends of the power lines are connected to the controller and the electrical components respectively. Does the motor line need protection during use? To this end, a protection mechanism for the front end of the motor line control branch circuit breaker is proposed.

[0003] For example, Chinese patent CN219477133U discloses a circuit protection mechanism, which relates to the field of electromechanical equipment technology; while this utility model includes a shell, a power cord is provided on the upper side of the shell, and a protection mechanism is provided on the outer side of the power cord. The protection mechanism includes a fixed plate, a rotating unit, a moving unit, a limiting unit, a rolling unit and a clamping unit. A fixed plate is provided on the lower side of the power cord, and the lower side of the fixed plate is fixedly connected to the shell. A rotating unit is provided in the middle of the fixed plate, a moving unit is provided on the outer side of the middle of the rotating unit, and a limiting unit is provided on the outer side of the lower end of the moving unit.

[0004] This patent has the following problems:

[0005] Existing technical documents do not provide convenient current protection for the three-phase power supply upstream of the motor circuit. The motor generates a large current during operation, reducing the safety of the motor circuit. Furthermore, existing technical documents do not provide convenient overheat protection for the motor circuit, which is prone to overheating and fire, thus reducing the stability of the motor circuit. Therefore, we propose a protection mechanism upstream of the circuit breaker in the motor circuit control branch. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned technical problems by providing a protection mechanism for the front end of a motor circuit control branch circuit breaker, thereby improving the safety and stability of motor circuit operation.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A protection mechanism for the front end of a motor circuit control branch circuit breaker includes a zero-sequence current transformer, and further includes: a current circuit breaker fixedly installed at the bottom of the zero-sequence current transformer, a contactor fixedly installed on one side of the current circuit breaker, a thermal relay fixedly installed on one side of the zero-sequence current transformer, a current regulator fixedly installed at the bottom of the thermal relay, and a controller fixedly installed on one side of the current regulator.

[0009] Based on the above structure, when the contactor of the current circuit breaker and the zero-sequence current transformer malfunctions, the zero-sequence current transformer will generate a large zero-sequence current, causing the current circuit breaker to disconnect the contactor and prevent the motor from burning out due to a missing phase. This provides current protection for the three-phase power supply in the front end of the motor circuit, thereby improving the safety of the motor circuit. Then, by utilizing the heat-bending characteristic of the bimetallic strip of the thermal relay, the control circuit is delayed and disconnected when the motor is overloaded for a long time. Finally, by using the current regulator and controller to preset the overload current threshold and automatically reset it, the motor circuit is less likely to overheat and catch fire during use, thereby improving the stability of the motor circuit.

[0010] Preferably, a component mounting plate is fixedly installed at one end of the zero-sequence current transformer, and the component mounting plate is threaded with component mounting screws inside.

[0011] Preferably, a protective box is movably mounted on one end of the component mounting plate, and an inner layer is fixedly mounted inside the protective box.

[0012] Preferably, a front mounting plate is fixedly installed at one end of the protective box, and a back mounting plate is fixedly installed at one end of the front mounting plate. Both the front mounting plate and the back mounting plate are threaded with back mounting screws. An opening and closing door is movably installed on the surface of the protective box via a hinge. A top mounting ring is installed through the top of the protective box, and a bottom mounting ring is installed through the bottom of the protective box.

[0013] Preferably, the door is made of stainless steel, and a locking device is installed inside the door.

[0014] Preferably, the top mounting ring is internally fixed with a top waterproof ring, which is made of rubber.

[0015] Preferably, the bottom mounting ring is internally fixed with a bottom waterproof ring, which is made of rubber.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The protection mechanism of the front end of the motor line control branch circuit breaker, through the zero-sequence current transformer and the current circuit breaker AC contactor poor contact, the zero-sequence current transformer will generate a large zero-sequence current, so that the current circuit breaker disconnects the contactor to prevent the motor from burning out due to missing phase. It can provide current protection for the three-phase power supply in the front end of the motor line, thereby improving the safety of the motor line.

[0018] (2) The protection mechanism of the front end of the circuit breaker of the motor line control branch uses the thermal relay’s bimetallic strip bending characteristics to delay disconnect the control circuit when the motor is overloaded for a long time. Then, the current regulator and controller are used to preset the overload current threshold and automatically reset it, which can protect the motor line from overheating. The motor line is less likely to overheat and catch fire during use, thereby improving the stability of the motor line. Attached Figure Description

[0019] Figure 1 This is a perspective view of the entire utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 3 This is a partial structural diagram of the component mounting plate in this utility model;

[0022] Figure 4 This is a partial perspective view of the protective box in this utility model;

[0023] Figure 5 This is a partial perspective view of the mounting front panel of this utility model.

[0024] The meanings of the labels in the diagram are as follows: 1. Front panel mounting; 101. Back panel mounting; 102. Back panel mounting screws; 2. Protective box; 201. Inner layer of the box; 3. Opening door; 301. Closing lock; 4. Top mounting ring; 401. Top waterproof ring; 5. Bottom mounting ring; 501. Bottom waterproof ring; 6. Component mounting plate; 601. Component plate mounting screws; 7. Zero-sequence current transformer; 701. Current circuit breaker; 702. Contactor; 8. Thermal relay; 801. Current regulator; 802. Controller. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] This application discloses a protection mechanism for the upstream section of a motor circuit control branch circuit breaker. Please refer to [link / reference]. Figures 1-5 The device includes a zero-sequence current transformer 7, and further includes: a current circuit breaker 701 fixedly installed at the bottom of the zero-sequence current transformer 7, a contactor 702 fixedly installed on one side of the current circuit breaker 701, a thermal relay 8 fixedly installed on one side of the zero-sequence current transformer 7, a current regulator 801 fixedly installed at the bottom of the thermal relay 8, and a controller 802 fixedly installed on one side of the current regulator 801.

[0028] Based on the above structure, when the zero-sequence current transformer 7 and the current circuit breaker 701 and AC contactor 702 have poor contact, the zero-sequence current transformer 7 will generate a large zero-sequence current, causing the current circuit breaker 701 to disconnect the contactor 702 to prevent the motor from burning out due to a missing phase. This can provide current protection for the three-phase power supply at the front end of the motor circuit, thereby improving the safety of the motor circuit. Then, by utilizing the heat-bending characteristic of the bimetallic strip of the thermal relay 8, the control circuit is delayed and disconnected when the motor is overloaded for a long time. Then, by using the current regulator 801 and the controller 802 to preset the overload current threshold and automatically reset, the motor circuit can be protected against overheating. The motor circuit is less likely to overheat and catch fire during use, thereby improving the stability of the motor circuit.

[0029] In one embodiment, a component mounting plate 6 is fixedly installed at one end of the zero-sequence current transformer 7, and component mounting plate screws 601 are threaded inside the component mounting plate 6.

[0030] Specifically, multiple components are mounted on the surface of component mounting plate 6 by screws.

[0031] In this embodiment, the component mounting screw 601 can be threaded through the inside of the component mounting plate 6 and the inside of the inner layer 201 of the box, thereby improving the stability of the component mounting plate 6 during installation.

[0032] In one embodiment, a protective box 2 is movably mounted on one end of the component mounting plate 6, and an inner layer 201 is fixedly mounted inside the protective box 2.

[0033] Specifically, the inner layer 201 is fixedly installed inside the protective box 2.

[0034] In this embodiment, the protective box 2 and the inner layer 201 can be used to protect the device, thereby improving the safety of the device.

[0035] In one embodiment, a front mounting plate 1 is fixedly installed at one end of the protective box 2, and a back mounting plate 101 is fixedly installed at one end of the front mounting plate 1. Both the front mounting plate 1 and the back mounting plate 101 are threaded with back mounting screws 102. An opening and closing door 3 is movably installed on the surface of the protective box 2 via a hinge. A top mounting ring 4 is installed through the top of the protective box 2, and a bottom mounting ring 5 is installed through the bottom of the protective box 2.

[0036] Specifically, the protective box 2 is fixedly welded onto the surface of the front panel 1.

[0037] In this embodiment, the device can be securely installed on the wall by using the back plate mounting screw 102 threaded through the mounting front plate 1 and the mounting back plate 101, thereby improving the stability of the electrical equipment installation.

[0038] In one embodiment, the door 3 is made of stainless steel, and a closing lock 301 is installed through the interior of the door 3.

[0039] Specifically, the closing lock 301 is installed through the surface inside the opening and closing door 3.

[0040] In this embodiment, the opening and closing door 3, in conjunction with the closing lock 301, can be movably closed and installed on the surface of the protective box 2, thereby improving the safety of the electrical equipment.

[0041] In one embodiment, a top waterproof ring 401 is fixedly fitted inside the top mounting ring 4, and the top waterproof ring 401 is made of rubber.

[0042] Specifically, a top mounting ring 4 made of plastic is installed through the top of the protective box 2 and the inner layer 201 of the box.

[0043] In this embodiment, the top mounting ring 4, together with the top waterproof ring 401, can be used to move the wire harness through, thereby improving the convenience of wire harness passage.

[0044] In one embodiment, a bottom waterproof ring 501 is fixedly fitted inside the bottom mounting ring 5, and the bottom waterproof ring 501 is made of rubber.

[0045] Specifically, a plastic mounting ring 5 is installed through the bottom of the protective box 2 and the inner layer 201 of the box.

[0046] In this embodiment, the bottom mounting ring 5, together with the bottom waterproof ring 501, can be used to move the wire harness through, thereby improving the convenience of wire harness passing through.

[0047] In this embodiment, the protection mechanism of the motor circuit control branch circuit breaker, when in use, causes a large zero-sequence current to be generated by the zero-sequence current transformer 7 in conjunction with the current circuit breaker 701 and the AC contactor 702 when there is a poor contact. This causes the current circuit breaker 701 to disconnect the contactor 702, preventing the motor from burning out due to a missing phase. Then, utilizing the heat-bending characteristic of the bimetallic strip of the thermal relay 8, the control circuit is delayed and disconnected when the motor is overloaded for a long time. Then, the current regulator 801, in conjunction with the controller 802, presets the overload current threshold and automatically resets it. Finally, the components... The mounting screw 601 is threaded through the inside of the mounting plate 6 and the inner layer 201 of the box. The protective box 2 and the inner layer 201 are used to protect the equipment. Then, the mounting screw 102 is threaded through the front mounting plate 1 and the back mounting plate 101 to secure the equipment to the wall. Then, the opening and closing door 3 is used in conjunction with the closing lock 301 to move and close the installation on the surface of the protective box 2. Then, the top mounting ring 4 is used in conjunction with the top waterproof ring 401 to move and pass the wire harness through. Then, the bottom mounting ring 5 is used in conjunction with the bottom waterproof ring 501 to move and pass the wire harness through.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A protection mechanism for the upstream section of a motor line control branch circuit breaker, comprising a zero-sequence current transformer (7), characterized in that, Also includes: A current circuit breaker (701) is fixedly installed at the bottom of the zero-sequence current transformer (7), a contactor (702) is fixedly installed on one side of the current circuit breaker (701), a thermal relay (8) is fixedly installed on one side of the zero-sequence current transformer (7), a current regulator (801) is fixedly installed at the bottom of the thermal relay (8), and a controller (802) is fixedly installed on one side of the current regulator (801).

2. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 1, characterized in that: The zero-sequence current transformer (7) has a component mounting plate (6) fixedly installed at one end, and the component mounting plate (6) is threaded with component mounting screws (601).

3. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 2, characterized in that: A protective box (2) is movably mounted on one end of the component mounting plate (6), and an inner layer (201) is fixedly installed inside the protective box (2).

4. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 3, characterized in that: One end of the protective box (2) is fixedly installed with a front mounting plate (1), and one end of the front mounting plate (1) is fixedly installed with a back mounting plate (101). The front mounting plate (1) and the back mounting plate (101) are both threaded with back mounting screws (102). The surface of the protective box (2) is movably installed with an opening and closing door (3) via a hinge. The top of the protective box (2) is through-installed with a top mounting ring (4), and the bottom of the protective box (2) is through-installed with a bottom mounting ring (5).

5. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 4, characterized in that: The opening and closing door (3) is made of stainless steel, and a closing lock (301) is installed through the interior of the opening and closing door (3).

6. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 4, characterized in that: The top mounting ring (4) is internally fixed with a top waterproof ring (401), which is made of rubber.

7. The protection mechanism for the upstream section of a motor circuit control branch circuit breaker according to claim 4, characterized in that: The bottom mounting ring (5) is internally fixed with a bottom waterproof ring (501), which is made of rubber.

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